CN218761579U - Selection valve for chromatographic column and liquid chromatograph - Google Patents

Abstract

The present disclosure relates to a selection valve for a chromatography column and a liquid chromatograph, the selection valve comprising a stator and a rotor, the rotor being rotatable relative to the stator, a first end face of the stator being in sealing contact with a first end face of the rotor; an inlet hole, an outlet hole, a first stator radial groove, a second stator radial groove, an annular groove and a plurality of pairs of connecting holes are formed on the first end surface of the stator. The inlet hole, the outlet hole and the plurality of pairs of connecting holes are all positioned on a first circumference which takes the center of the stator as the center of a circle, the annular groove is positioned on a second circumference which takes the center of the stator as the center of a circle, the first stator radial groove extends from the inlet hole to the center of the stator along the radial direction of the stator, and the second stator radial groove extends from the outlet hole to the annular groove along the radial direction of the stator; a first rotor radial slot and a second rotor radial slot are formed on the first end face of the rotor. The angle of a central angle corresponding to an arc where two corresponding connecting holes in each pair of connecting holes are located is the same as the angle of an included angle formed by the first rotor radial groove and the second rotor radial groove.

Description

Selection valve for chromatographic column and liquid chromatograph

Technical Field

The disclosure relates to the technical field of liquid chromatographs, in particular to a selector valve for a chromatographic column and a liquid chromatograph.

Background

In order to sufficiently analyze components of a mixture, a liquid chromatograph includes a chromatographic column, and the chromatographic column is a device for achieving separation by using differences in physicochemical properties of components in the mixture, and by using the differences in the distribution degree and thus the flow velocity of the components in the chromatographic column.

For a complex chromatographic experimental system, a plurality of chromatographic columns exist in the system, and one of the chromatographic columns needs to be selectively conducted through a selection valve according to experimental conditions. In the related art, the selector valve generally includes a stator and a rotor, the stator is formed with a plurality of holes and/or slots, the rotor is also formed with a plurality of holes and/or slots, and by rotating the rotor, the positions of the holes and/or slots on the rotor can be changed, so as to change the communication relationship between the holes and/or slots on the rotor and the holes and/or slots on the stator, and further change the flow path in the selector valve, so that the selector valve can conduct one of the plurality of chromatography columns by rotating the rotor. However, the holes on the stator of the selector valve in the related art are usually located on different circumferences with the center of the stator as the center of a circle, which brings certain difficulty to processing, and errors easily occur in the positions of the holes, which is not beneficial to reducing the manufacturing difficulty and cost of the selector valve and improving the manufacturing precision of the selector valve.

SUMMERY OF THE UTILITY MODEL

An object of the present disclosure is to provide a selection valve for a chromatography column and a liquid chromatograph to solve technical problems occurring in the related art.

As one aspect of the present disclosure, the present disclosure provides a selector valve for a chromatography column, comprising a stator and a rotor, the rotor being rotatable relative to the stator, a first end face of the stator being in sealing contact with a first end face of the rotor;

an inlet hole, an outlet hole, a first stator radial groove, a second stator radial groove, an annular groove and a plurality of pairs of connecting holes are formed on the first end surface of the stator, the inlet hole is used for being communicated with a fluid supply source of a liquid chromatograph, the outlet hole is used for being communicated with a liquid discharge pipe of the liquid chromatograph, the plurality of pairs of connecting holes are used for being arranged in one-to-one correspondence with a plurality of chromatographic columns of the liquid chromatograph, each pair of connecting holes comprises a sample feeding connecting hole and a sample discharging connecting hole, each sample feeding connecting hole is used for being communicated with a sample feeding end of the corresponding chromatographic column, and each sample discharging connecting hole is used for being communicated with a sample discharging end of the corresponding chromatographic column;

the inlet hole, the outlet hole and the plurality of pairs of connecting holes are all located on a first circumference taking the center of the stator as a center, the annular groove is located on a second circumference taking the center of the stator as a center, the radius of the first circumference is smaller than that of the second circumference, the first stator radial groove extends from the inlet hole to the center of the stator along the radial direction of the stator, and the second stator radial groove extends from the outlet hole to the annular groove along the radial direction of the stator;

a first rotor radial groove and a second rotor radial groove are formed on the first end surface of the rotor, the projection of the first rotor radial groove on the stator extends from the center of the stator to the first circumference along the radial direction of the stator, and the projection of the second rotor radial groove on the stator extends from the first circumference to the annular groove along the radial direction of the stator;

the angle of a central angle corresponding to the circular arc where the sample feeding connecting hole and the sample discharging connecting hole in each pair of connecting holes are located is the same as the angle of an included angle formed by the first rotor radial groove and the second rotor radial groove.

Optionally, the sample inlet connection hole and the sample outlet connection hole in each pair of connection holes are located on the same straight line extending in the radial direction of the stator, and the projection of the first rotor radial groove on the stator and the projection of the second rotor radial groove on the stator are located on the same straight line extending in the radial direction of the stator.

Optionally, the inlet hole and the outlet hole are located on the same straight line extending in a radial direction of the stator, the first circumference includes a first semicircular arc from one side of the inlet hole to one side of the outlet hole and a second semicircular arc from the other side of the inlet hole to the other side of the outlet hole, the sample inlet connection holes of the plurality of pairs of connection holes are located on the first semicircular arc, and the sample outlet connection holes of the plurality of pairs of connection holes are located on the second semicircular arc.

Optionally, the radius of the second circumference is 2mm-5mm larger than the radius of the first circumference.

Optionally, the stator is further formed with an inlet interface, an outlet interface and a plurality of pairs of chromatography column interfaces,

the inlet interface is used for connecting the fluid source and is communicated with the inlet hole, the outlet interface is used for connecting the liquid discharge pipe and is communicated with the outlet hole, a plurality of pairs of chromatographic column interfaces are arranged in one-to-one correspondence with the plurality of pairs of connecting holes, each pair of chromatographic column interfaces comprises a sample inlet interface and a sample outlet interface, each sample inlet interface is used for being connected with the sample inlet end of the corresponding chromatographic column and is communicated with the corresponding sample inlet connecting hole, and each sample outlet interface is used for being connected with the sample outlet end of the corresponding chromatographic column and is communicated with the corresponding sample outlet connecting hole;

the inlet interface and the outlet interface are both positioned on the second end face of the stator, and the plurality of pairs of chromatographic column interfaces are both positioned on the peripheral surface of the stator.

Optionally, the outer circumferential surface of the stator includes a cylindrical outer circumferential surface and a tapered outer circumferential surface, the tapered outer circumferential surface being located between the cylindrical outer circumferential surface and the second end surface of the stator, the tapered outer circumferential surface gradually decreasing in diameter in a direction from the cylindrical outer circumferential surface to the second end surface of the stator;

and one part of the plurality of pairs of chromatographic column interfaces is positioned on the cylindrical outer peripheral surface, and the other part of the plurality of pairs of chromatographic column interfaces is positioned on the conical outer peripheral surface.

Optionally, the chromatography column interface on the cylindrical outer circumferential surface and the chromatography column interface on the conical outer circumferential surface are arranged in a staggered manner.

Optionally, the axis of the sample inlet port and the axis of the sample outlet port in each pair of chromatography column ports extend obliquely from the outer peripheral surface of the stator to the first end surface of the stator.

Optionally, the axes of the sample inlet port and the sample outlet port in the pair of chromatography column ports located on the cylindrical outer peripheral surface extend obliquely from the cylindrical outer peripheral surface to the first end surface of the stator;

and fan-shaped avoiding grooves are formed on the outer sides of the sample inlet interface and the sample outlet interface which are positioned on the columnar peripheral surface and in pairs in the chromatographic column interface.

As another aspect of the present disclosure, the present disclosure provides a liquid chromatograph including a plurality of chromatography columns and the above-described selector valve.

Through above-mentioned technical scheme, inlet hole, exit hole and many are all located first circumference to the connecting hole, in the course of working, need not to adjust the position of trompil equipment, can set up inlet hole, exit hole and many pairs of connecting hole on the first circumference of stator through rotatory stator, are favorable to reducing the manufacturing degree of difficulty and the cost of selection valve, improve the machining precision of selection valve.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a schematic perspective view of a stator of a selector valve provided in accordance with an embodiment of the present disclosure;

FIG. 2 is a schematic perspective view of a rotor of a selector valve provided in accordance with an embodiment of the present disclosure;

FIG. 3 is a schematic top view of a stator of a selector valve provided in accordance with an embodiment of the present disclosure;

FIG. 4 is a schematic side view of a stator of a selector valve provided in accordance with an embodiment of the present disclosure;

FIG. 5 is a schematic bottom view of a stator of the selector valve provided by one embodiment of the present disclosure;

fig. 6 is a schematic plan view of an arrangement of an inlet hole, an outlet hole, a first stator radial groove, a second stator radial groove, an annular groove, and a plurality of pairs of connection holes of a stator of a selector valve according to an embodiment of the present disclosure, in which two dotted lines represent a first circumference and a second circumference, respectively;

FIG. 7 is a schematic plan view of a first rotor radial slot and a second rotor radial slot of a rotor of a selector valve provided in accordance with an embodiment of the present disclosure, wherein two dotted lines represent projections of a first circumference and a second circumference on the rotor, respectively;

FIG. 8 is a schematic view of a selection valve in communication with one of a plurality of chromatography columns according to one embodiment of the present disclosure;

FIG. 9 is a schematic diagram of a selection valve in communication with one of a plurality of chromatography columns according to an embodiment of the present disclosure; wherein the sample flow direction is opposite to that of fig. 8;

FIG. 10 is a schematic view of a selector valve in a purge state according to one embodiment of the present disclosure.

Description of the reference numerals

1-a stator; 11-a first end face of the stator; 12-an inlet aperture; 13-an outlet orifice; 14-first stator radial slots; 15-a second stator radial slot; 16-an annular groove; 17-a connection hole; 171-sample introduction connection hole; 172-sample outlet connecting holes; 19-a first circumference; 20-a second circumference; 111-ingress interface; 112-an egress interface; 113-chromatography column interface; 114-a second end face of the stator; 115-cylindrical outer peripheral surface; 116-a tapered outer peripheral surface; 117-fan-shaped avoidance slots; 2-a rotor; 21-a first end face of the rotor; 22-first rotor radial slots; 23-second rotor radial slots; 3-chromatographic column.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, terms such as "first" and "second" are used only to distinguish one element from another element without having a sequential or important meaning unless otherwise stated. Furthermore, the use of directional terms is merely to facilitate describing the present disclosure and is not intended to indicate or imply that the referenced device or element must have a particular orientation, configuration and operation in a particular orientation and should not be taken as limiting the present disclosure.

As shown in fig. 1 to 10, as one aspect of the present disclosure, the present disclosure provides a selector valve for a chromatography column 3, comprising a stator 1 and a rotor 2, the rotor 2 being rotatable relative to the stator 1, a first end face 11 of the stator being in sealing contact with a first end face 21 of the rotor. An inlet hole 12, an outlet hole 13, a first stator radial groove 14, a second stator radial groove 15, an annular groove 16 and a plurality of pairs of connecting holes 17 are formed on a first end surface 11 of the stator, the inlet hole 12 is used for being communicated with a fluid supply source of a liquid chromatograph, the outlet hole 13 is used for being communicated with a drain pipe of the liquid chromatograph, the plurality of pairs of connecting holes 17 are used for being arranged in one-to-one correspondence with a plurality of chromatographic columns 3 of the liquid chromatograph, each pair of connecting holes 17 comprises a sample introduction connecting hole 171 and a sample discharge connecting hole 172, each sample introduction connecting hole 171 is used for being communicated with a sample introduction end of the corresponding chromatographic column 3, and each sample discharge connecting hole 172 is used for being communicated with a sample discharge end of the corresponding chromatographic column 3.

The inlet hole 12, the outlet hole 13 and the plurality of pairs of connecting holes 17 are all located on a first circumference 19 taking the center of the stator 1 as a center, the annular groove 16 is located on a second circumference 20 taking the center of the stator 1 as a center, the radius of the first circumference 19 is smaller than that of the second circumference 20, the first stator radial groove 14 extends from the inlet hole 12 to the center of the stator 1 along the radial direction of the stator 1, and the second stator radial groove 15 extends from the outlet hole 13 to the annular groove 16 along the radial direction of the stator 1. The first end face 21 of the rotor is formed with a first rotor radial slot 22 and a second rotor radial slot 23, the projection of the first rotor radial slot 22 on the stator 1 extends from the center of the stator 1 to the first circumference 19 in the radial direction of the stator 1, and the projection of the second rotor radial slot 23 on the stator 1 extends from the first circumference 19 to the annular slot 16 in the radial direction of the stator 1. The angle of the central angle corresponding to the circular arc where the sample inlet connection hole 171 and the sample outlet connection hole 172 in each pair of connection holes 17 are located is the same as the angle of the included angle formed by the first rotor radial groove 22 and the second rotor radial groove 23.

The first rotor radial groove 22 and the second rotor radial groove 23 on the first end face 21 of the rotor can be driven to rotate together by the rotation of the rotor 2, because the angle of the central angle corresponding to the circular arc where the sample feeding connecting hole 171 and the sample discharging connecting hole 172 in each pair of connecting holes 17 are located is the same as the angle formed by the first rotor radial groove 22 and the second rotor radial groove 23, the first rotor radial groove 22 can communicate the inlet hole 12 with the sample feeding connecting hole 171 of the pair of connecting holes 17 through the first stator radial groove 14, and the second rotor radial groove 23 can communicate the outlet hole 13 with the sample discharging connecting hole 172 of the pair of connecting holes 17 through the annular groove 16 and the second stator radial groove 15, that is, by rotating the rotor 2, the first rotor radial groove 22 and the second rotor radial groove 23 can be rotated to the position communicated with the pair of connecting holes 17 in the plurality of pairs of connecting holes 17, so that the sample can flow from the inlet hole 12 to the first rotor radial groove 22 through the first stator radial groove 14, pass through the rotor 171, then enter the chromatography column 3, flow out of the sample discharging section from the chromatography column 3, and flow into the second rotor radial groove 13, and then circulate into the annular groove 13.

For example, as shown in fig. 8, in a conducting state of conducting through one chromatography column 3 of the plurality of chromatography columns 3 by the selection valve, the inlet hole 12 is communicated with the sample connection hole 171 of the corresponding pair of connection holes 17 of the chromatography column 3 through the first stator radial groove 14 and the first rotor radial groove 22, the sample connection hole 171 and the sample connection hole 172 of the pair of connection holes 17 are communicated through the chromatography column 3, the sample connection hole 172 of the pair of connection holes 17 is communicated with the annular groove 16 through the second rotor radial groove 23, and the annular groove 16 is communicated with the outlet hole 13 through the second stator radial groove 15. Thus, in this state, the sample flows in from the outlet hole 13, passes through the first stator radial groove 14, enters the sample inlet connection hole 171 of the pair of connection holes 17 from the first rotor radial groove 22, is separated by the chromatographic column 3, and the remaining sample enters the second rotor radial groove 23 through the sample outlet connection hole 172 of the pair of connection holes 17, and is discharged into the outlet hole 13 from the annular groove 16 and the second stator radial groove 15 communicating with the annular groove 16.

Through the technical scheme, the inlet hole 12, the outlet hole 13 and the pairs of connecting holes 17 are all located on the first circumference 19, in the machining process, the position of the hole opening equipment does not need to be adjusted, the inlet hole 12, the outlet hole 13 and the pairs of connecting holes 17 can be formed in the first circumference 19 of the stator 1 by rotating the stator 1, the manufacturing difficulty and the manufacturing cost of the selector valve are reduced, and the machining precision of the selector valve is improved.

In order to change the flow direction of the sample in the chromatographic column 3, optionally, as shown in fig. 6, the sample inlet connecting hole 171 and the sample outlet connecting hole 172 in each pair of connecting holes 17 are located on the same straight line extending in the radial direction of the stator 1, and the projection of the first rotor radial groove 22 on the stator 1 and the projection of the second rotor radial groove 23 on the stator 1 are located on the same straight line extending in the radial direction of the stator 1.

Since the projection of the second rotor radial groove 23 on the stator 1 is located on the same straight line as the projection of the first rotor radial groove 22 on the stator 1, and the sample outlet connection hole 172 is also located on the same straight line as the sample inlet connection hole 171. As shown in FIG. 8, when the selector valve is in a conducting state for conducting any one of the columns 3, the first rotor radial groove 22 communicates with the inlet hole 12 and the sample connection hole 171, and the second rotor radial groove 23 communicates with the sample connection hole 172 and the annular groove 16. When the rotor 2 of the selector valve is rotated, the first rotor radial groove 22 rotates 180 degrees along with the rotor 2, because the projection of the first rotor radial groove 22 on the stator 1 and the projection of the second rotor radial groove 23 on the stator 1 are both located on the same straight line extending in the radial direction of the stator 1, and the first rotor radial groove 22 and the second rotor radial groove 23 exchange positions after rotating, as shown in fig. 9, the first rotor radial groove 22 communicates the first stator radial groove 14 with the sample outlet connection hole 172, the second rotor radial groove 23 is in a state of communicating the sample inlet connection hole 171 with the annular groove 16, and the inlet hole 12 is located in the first stator radial groove 14, so that the liquid flows through the first rotor radial groove 22 into the sample outlet connection hole 172 via the inlet hole 12 and the first stator radial groove 14 at this time, so that the sample enters from the sample outlet end of the chromatographic column 3, flows out from the sample inlet end of the chromatographic column 3, flows through the sample inlet connection hole 171, communicates with the annular groove 16 via the second rotor radial groove 23, and is discharged from the outlet hole 13 communicating with the second stator radial groove 15, thereby realizing the reverse flow of the chromatographic column 3. With the arrangement, the rotation of the selection valve can realize the selection function in the plurality of chromatographic columns 3, and the rotation of the rotor 2 can realize the forward and reverse flow of the sample, thereby improving the separation effect. Meanwhile, the equipment does not need to be disassembled and reinstalled in order to change the flow direction, and the operation complexity is reduced.

Alternatively, as shown in fig. 6, the inlet hole 12 and the outlet hole 13 are both located on the same straight line extending in the radial direction of the stator 1, the first circumference 19 includes a first semicircular arc from one side of the inlet hole 12 to one side of the outlet hole 13 and a second semicircular arc from the other side of the inlet hole 12 to the other side of the outlet hole 13, the sample connection holes 171 of the plurality of pairs of connection holes 17 are all located on the first semicircular arc, and the sample connection holes 172 of the plurality of pairs of connection holes 17 are all located on the second semicircular arc.

Since the inlet opening 12 and the outlet opening 13 are located on the same straight line extending in the radial direction of the stator 1, and the projections of the first rotor radial groove 22 and the second rotor radial groove 23 on the stator 1 are also located on the same straight line, and the inlet opening 12 is on the first circumference 19 and the outlet opening 13 is also on the first circumference 19. Thus, by rotation of the rotor 2, the inlet aperture 12 can be put into communication with the annular slot 16 through the second rotor radial slot 23 and also the first stator radial slot 14 and the outlet aperture 13 through the first rotor radial slot 22. So configured, flushing liquid can enter the annular groove 16 through the inlet hole 12, through the second rotor radial groove 23, and then enter the outlet hole 13 through the second stator radial groove 15; the flushing liquid can also pass through the first stator radial slots 14, via the first rotor 2 directional slots, into the outlet aperture 13. Thereby accomplish the washing to first rotor radial slot 22, second rotor radial slot 23, first stator radial slot 14, second stator radial slot 15 and ring channel 16, promote the life of selection valve, easy operation simultaneously only needs rotation rotor 2 to above-mentioned position, can accomplish the washing.

And, the sample introduction connecting hole 171 and the sample outlet connecting hole 172 in each pair of connecting holes 17 are located on the same straight line extending along the radial direction of the stator 1, and the sample introduction connecting hole 171 and the sample outlet connecting hole 172 are respectively arranged on the first semicircular arc and the second semicircular arc, and the sample introduction connecting hole 171 and the sample outlet connecting hole 172 of the connecting hole 17 can be respectively arranged at the intersection point positions of any straight line passing through the center of the first circumference 19 and the two intersection points on the first semicircular arc and the second semicircular arc, so that more pairs of connecting holes 17 can be arranged on the first semicircular arc and the second semicircular arc as required to meet the arrangement requirements of the chromatography columns 3 with different numbers.

Optionally, the radius of the second circumference 20 is 2mm-5mm larger than the radius of the first circumference 19. The inlet opening 12, the outlet opening 13 and the pairs of connecting openings 17 are all located on a first circumference 19 centred on the centre of the stator 1, and the annular groove 16 is located on a second circumference 20 centred on the centre of the stator 1. In order to ensure the separation effect of the sample, the sample flowing out of the chromatographic column 3 and the sample flowing into the chromatographic column 3 should be strictly distinguished to avoid mixing, and the radius of the second circumference 20 is 2mm-5mm larger than that of the first circumference 19, so that a certain distance exists between the annular groove 16 and the inlet hole 12 and between the pairs of connecting holes 17, and the sample discharged through the annular groove 16 and the sample flowing through the connecting holes 17 can be prevented from polluting each other and interfering with the test result during use.

Optionally, as shown in fig. 1, 3 and 4, the stator 1 is further formed with an inlet port 111, an outlet port 112 and a plurality of pairs of chromatography column ports 113. The inlet interface 111 is used for connecting a fluid source and is communicated with the inlet hole 12, the outlet interface 112 is used for connecting a drain pipe and is communicated with the outlet hole 13, a plurality of pairs of chromatographic column interfaces 113 and a plurality of pairs of connecting holes 17 are arranged in a one-to-one correspondence manner, each pair of chromatographic column interfaces 113 comprises a sample inlet interface and a sample outlet interface, each sample inlet interface is used for being connected with a sample inlet end of the corresponding chromatographic column 3 and is communicated with the corresponding sample inlet connecting hole 171, and each sample outlet interface is used for being connected with a sample outlet end of the corresponding chromatographic column 3 and is communicated with the corresponding sample outlet connecting hole 172. The inlet port 111 and the outlet port 112 are both located on the second end face 114 of the stator, and the plurality of pairs of chromatographic column ports 113 are both located on the outer peripheral surface of the stator 1. Because the inlet interface 111, the outlet interface 112 and the plurality of pairs of chromatographic column interfaces 113 are respectively connected with different devices, and the pipeline corresponding to each device is provided with a joint, the inlet interface 111, the outlet interface 112 and the plurality of pairs of chromatographic column interfaces 113 are respectively arranged on the second end surface 114 and the peripheral surface of the stator, thereby being convenient for connecting different joints and avoiding the joints from interfering in the installation process.

Optionally, a plurality of chromatographic columns 3 can be communicated with the stator 1 through a communicating pipe, a connector which can be matched with the inlet connector 111, the outlet connector 112 and a plurality of pairs of chromatographic column connectors 113 is further arranged on the communicating pipe, and the pipeline is more convenient to mount and dismount through the matching of the connectors and the connector.

In order to better arrange the location of the interface, optionally, as shown in fig. 1, the outer circumferential surface of the stator 1 includes a cylindrical outer circumferential surface 115 and a tapered outer circumferential surface 116, the tapered outer circumferential surface 116 being located between the cylindrical outer circumferential surface 115 and the second end surface 114 of the stator, the diameter of the tapered outer circumferential surface 116 gradually decreasing in a direction from the cylindrical outer circumferential surface 115 to the second end surface of the stator. Some of the plural pairs of chromatography column ports 113 are located on the cylindrical outer peripheral surface 115, and some of the plural pairs of chromatography column ports 113 are located on the tapered outer peripheral surface 116. Since the stator 1 needs to be connected to a plurality of different chromatographic columns 3, a plurality of pairs of chromatographic column ports 113 are disposed on the outer circumferential surface of the stator 1 to connect to the different chromatographic columns 3. Different chromatographic column interfaces 113 are respectively arranged on the cylindrical outer peripheral surface 115 and the conical outer peripheral surface 116 of the stator 1, so that the distance between the different interfaces can be increased, the surface area of the outer peripheral surface of the stator 1 can be fully utilized, and meanwhile, the interference between pipelines or joints of the pipelines corresponding to the chromatographic columns 3 can be prevented when the chromatographic columns 3 are connected.

Alternatively, the chromatography column ports 113 on the cylindrical outer circumferential surface 115 and the chromatography column ports 113 on the tapered outer circumferential surface 116 are arranged offset from each other. The chromatography column ports 113 on different surfaces are staggered, so that the possibility of interference between the ports in the installation process can be reduced, and convenience is brought to maintenance and pipeline arrangement.

Alternatively, as shown in fig. 1 and 4, the axis of the sample inlet port and the axis of the sample outlet port in each pair of chromatography column ports 113 extend obliquely from the outer peripheral surface of the stator 1 to the first end surface 11 of the stator. Because the axis of the chromatographic column interface 113 is obliquely arranged, in the installation process, in order to enable the joint to be matched with the chromatographic column interface 113, the axis of the joint matched with the interface is overlapped with the axis of the interface, the installation difficulty of an installer during the installation of the overlooking second end face 114 of the stator can be reduced, and the installation speed is increased. In addition, due to the inclined arrangement of the axis of the chromatography column interface 113, the flow channel extending from the chromatography column interface 113 to the first end surface 11 of the stator can be allowed to be arranged as an inclined straight flow channel, so that the bending in the internal flow channel is reduced, the processing difficulty is reduced, and the flow speed of the sample in the internal flow channel is improved.

Alternatively, as shown in fig. 1 and 4, the axes of the sample inlet and outlet ports of the pair of chromatography column ports 113 on the cylindrical outer circumferential surface 115 extend obliquely from the cylindrical outer circumferential surface 115 to the first end surface 11 of the stator, and fan-shaped avoiding grooves 117 are formed outside the sample inlet and outlet ports of the pair of chromatography column ports 113 on the cylindrical outer circumferential surface 115. Because the axis of the sample inlet and outlet ports extends to the first end surface 11 of the stator in an inclined manner, and the first end surface 11 of the stator is perpendicular to the cylindrical outer peripheral surface 115 of the stator 1, the axis of the sample inlet and outlet ports and the cylindrical outer peripheral surface 115 form a certain angle. In order to prevent interference between the joint and the cylindrical outer peripheral surface 115 due to the fact that the joint is matched with the cylindrical outer peripheral surface 115 at an angle when the joint is installed, fan-shaped avoiding grooves 117 are formed on the outer sides of the sample inlet interface and the sample outlet interface in the pair of chromatographic column interfaces 113 on the cylindrical outer peripheral surface 115, so that the joint can avoid the cylindrical outer peripheral surface 115 of the stator 1 in the installation and rotation process, and the interference is reduced.

As another aspect of the present disclosure, the present disclosure also provides a liquid chromatograph including a plurality of chromatography columns 3 and the above-described selector valve.

Claims (10)

1. A selector valve for a chromatography column, comprising a stator and a rotor, the rotor being rotatable relative to the stator, a first end face of the stator being in sealing contact with a first end face of the rotor;

an inlet hole, an outlet hole, a first stator radial groove, a second stator radial groove, an annular groove and a plurality of pairs of connecting holes are formed on the first end surface of the stator, the inlet hole is used for being communicated with a fluid supply source of a liquid chromatograph, the outlet hole is used for being communicated with a liquid discharge pipe of the liquid chromatograph, the plurality of pairs of connecting holes are used for being arranged in one-to-one correspondence with a plurality of chromatographic columns of the liquid chromatograph, each pair of connecting holes comprises a sample feeding connecting hole and a sample discharging connecting hole, each sample feeding connecting hole is used for being communicated with a sample feeding end of the corresponding chromatographic column, and each sample discharging connecting hole is used for being communicated with a sample discharging end of the corresponding chromatographic column;

the inlet hole, the outlet hole and the plurality of pairs of connecting holes are all located on a first circumference taking the center of the stator as a center, the annular groove is located on a second circumference taking the center of the stator as a center, the radius of the first circumference is smaller than that of the second circumference, the first stator radial groove extends from the inlet hole to the center of the stator along the radial direction of the stator, and the second stator radial groove extends from the outlet hole to the annular groove along the radial direction of the stator;

a first rotor radial groove and a second rotor radial groove are formed on the first end surface of the rotor, the projection of the first rotor radial groove on the stator extends from the center of the stator to the first circumference along the radial direction of the stator, and the projection of the second rotor radial groove on the stator extends from the first circumference to the annular groove along the radial direction of the stator;

the angle of a central angle corresponding to an arc where the sample feeding connecting hole and the sample discharging connecting hole in each pair of connecting holes are located is the same as the angle of an included angle formed by the first rotor radial groove and the second rotor radial groove.

2. The selector valve according to claim 1, wherein the sample inlet connection hole and the sample outlet connection hole in each pair of connection holes are located on the same straight line extending in the radial direction of the stator, and the projection of the first rotor radial groove on the stator and the projection of the second rotor radial groove on the stator are located on the same straight line extending in the radial direction of the stator.

3. The selector valve of claim 2, wherein the inlet and outlet apertures are each located on a same straight line extending in a radial direction of the stator, the first circumference includes a first semicircular arc from one side of the inlet aperture to one side of the outlet aperture and a second semicircular arc from the other side of the inlet aperture to the other side of the outlet aperture, the sample connection apertures of the plurality of pairs of connection apertures are each located on the first semicircular arc, and the sample connection apertures of the plurality of pairs of connection apertures are each located on the second semicircular arc.

4. Selection valve according to any of claims 1-3, characterised in that the radius of the second circumference is 2-5 mm larger than the radius of the first circumference.

5. The selector valve according to any one of claims 1 to 3, wherein the stator is further formed with an inlet port, an outlet port, and a plurality of pairs of chromatography column ports,

the inlet interface is used for connecting the fluid supply source and is communicated with the inlet hole, the outlet interface is used for connecting the drain pipe and is communicated with the outlet hole, a plurality of pairs of chromatographic column interfaces are arranged in one-to-one correspondence with the plurality of pairs of connecting holes, each pair of chromatographic column interfaces comprises a sample inlet interface and a sample outlet interface, each sample inlet interface is used for being connected with the sample inlet end of the corresponding chromatographic column and is communicated with the corresponding sample inlet connecting hole, and each sample outlet interface is used for being connected with the sample outlet end of the corresponding chromatographic column and is communicated with the corresponding sample outlet connecting hole;

the inlet interface and the outlet interface are both positioned on the second end face of the stator, and the plurality of pairs of chromatographic column interfaces are both positioned on the peripheral surface of the stator.

6. The selector valve according to claim 5, wherein the outer peripheral surface of the stator includes a cylindrical outer peripheral surface and a tapered outer peripheral surface, the tapered outer peripheral surface being located between the cylindrical outer peripheral surface and the second end surface of the stator, the tapered outer peripheral surface gradually decreasing in diameter in a direction from the cylindrical outer peripheral surface to the second end surface of the stator;

and one part of the plurality of pairs of chromatographic column interfaces is positioned on the cylindrical outer peripheral surface, and the other part of the plurality of pairs of chromatographic column interfaces is positioned on the conical outer peripheral surface.

7. The selector valve according to claim 6, wherein the column ports on the cylindrical outer peripheral surface and the column ports on the tapered outer peripheral surface are arranged to be offset from each other.

8. The selector valve according to claim 5, wherein the axis of the sample inlet port and the axis of the sample outlet port in each pair of chromatography column ports extend obliquely from the outer circumferential surface of the stator to the first end surface of the stator.

9. The selector valve according to claim 6, wherein the axes of the sample inlet port and the sample outlet port of the pair of chromatography column ports located on the cylindrical outer peripheral surface extend obliquely from the cylindrical outer peripheral surface to the first end surface of the stator;

and fan-shaped avoiding grooves are formed on the outer sides of the sample inlet interface and the sample outlet interface which are positioned on the columnar peripheral surface and in pairs in the chromatographic column interface.

10. A liquid chromatograph comprising a plurality of chromatography columns and the selection valve of any one of claims 1-9.

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