CN111237496A - A valve rotor, rotary switching valve and chromatographic analysis instrument - Google Patents

Abstract

The invention provides a valve rotor, a rotary switching valve and a chromatographic analysis instrument, which relate to the technical field of chemical equipment and aim to solve the technical problems that in the prior art, an arc-shaped groove structure of the rotary switching valve is easy to leak liquid, and a stator and a rotor are abraded during use, so that the service life is short, and the device comprises a rotor top layer and a rotor bottom layer which are sequentially arranged, wherein: the top layer of the rotor is provided with a plurality of hole structures, and each hole structure extends downwards along the end surface of the top layer of the rotor to form a circulation hole; the bottom layer of the rotor comprises at least one layer surface, each layer surface is provided with one or more grooves, and each groove is at least communicated with one circulation hole of the top layer of the rotor.

Description

A valve rotor, rotary switching valve and chromatographic analysis instrument

technical field

The invention relates to the technical field of chemical equipment, in particular to a valve rotor, a rotary switching valve and a chromatographic analysis instrument.

Background technique

Liquid or gas rotary valves are widely used in various fields, and play a very important role in chemical analysis instruments, especially chromatographic chemical analysis instruments and in the field of electrochemistry. In chromatographic analysis instruments, the switching valve is used to quantitatively send the detected sample through the switching of the valve to perform sample analysis or to select and switch various solutions. With the development of chromatography, the pressure of the system is getting higher and higher, especially ultra-high pressure chromatography, which puts forward higher and more complex requirements for the switching valve, while ensuring the long-term durability of the valve, because the rotary switching valve is under high pressure. It is achieved by rotation, and the rotation between the two surfaces will produce gravitational friction.

The structure of the switching valve in the prior art is generally to use a stator composed of a threaded hole and an end hole and a rotor composed of an arc groove on the end face to realize the rotation switching of the valve. Figure 1 shows the rotor and stator of the six-way valve in the prior art. Schematic diagram of the structure, as shown in Figure 1, it is mainly composed of the existing stator 100 and the existing rotor 200, wherein the existing rotor 200 has three concentric arc grooves 300, if it is a ten-way valve, there are five If it is a 12-way valve, there will be six arc grooves and so on. It currently has three main problems:

1. The two end faces of the switching valve are asymmetrical (the end face of the stator is a hole, and the end face of the rotor is several arc grooves), which will cause wear due to asymmetry during the valve rotation switching process, which greatly reduces the rotation of the switching valve. service life.

2. Since the rotary switching valve is often used in high-pressure systems, the high-pressure liquid in the arc groove will generate a force opposite to the end face. During use, the pressure varies with the load behind the rotary switching valve. The system has different pressures, so in the assembly of the rotary switching valve, if the end face pressure is too tight, it will be very difficult to switch during idling, and if the end face pressure is not tight, the valve will leak when the high pressure rotates.

3. The arc-shaped groove structure on the rotor of the rotary switch valve is prone to liquid leakage, because the entire arc-shaped edge of the arc-shaped groove may cause liquid leakage with the edge of the end face.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a valve rotor, a rotary switching valve and a chromatographic analysis instrument, so as to solve the problem that the arc-shaped groove structure of the rotary switching valve existing in the prior art is prone to liquid leakage, and due to the wear of the stator and the rotor during use, the use of Technical issues with low lifespan. The technical effects that can be produced by the preferred technical solutions among the technical solutions provided by the present invention are detailed in the following descriptions.

For achieving the above object, the invention provides the following technical solutions:

A valve rotor provided by the present invention includes a rotor top layer rotor bottom layer arranged in sequence, wherein:

The rotor top layer is provided with a plurality of hole structures, and each of the hole structures extends downward along the end surface of the rotor top layer to form a flow hole;

The rotor bottom layer includes at least one layer, each of which is provided with one or more grooves, and each of the grooves is configured to communicate with at least one flow hole of the rotor top layer.

Preferably, the bottom layer of the rotor includes a first layer, at least one first slot is formed on the first layer, and the flow hole is arranged in communication with the end of the first slot.

Preferably, the bottom layer of the rotor further includes at least one second layer, at least one second layer is sequentially arranged at the bottom of the first layer, and at least one second groove is arranged on the second layer, and the flow through The hole is arranged in communication with the end of the second groove.

Preferably, a sealing layer is also included, and the sealing layer is disposed on the bottom of the bottom layer of the rotor.

Preferably, the first groove is configured as a "one"-shaped groove; the second groove is configured as a "one"-shaped groove, a "T"-shaped groove or a "Y"-shaped groove.

Preferably, the hole structures are arranged on a regular polygon, and the centers of the hole structures are respectively located at the vertices of the regular polygon.

A rotary switching valve, comprising the above-mentioned valve rotor, and also comprising a valve stator, wherein:

The end face of the rotor top layer of the valve rotor is symmetrically arranged with the end face of the valve stator;

A plurality of holes are provided on the end surface of the valve stator, and the hole structures on the top layer of the valve rotor are arranged in a one-to-one correspondence with the holes.

A chromatographic analysis instrument, comprising the above-mentioned rotary switching valve.

Preferably, it also includes a syringe, a mobile phase, a loop and a chromatographic column connected to the rotary switching valve, wherein:

A pump is provided between the mobile phase and the rotary switching valve;

The chromatographic column is connected to the detector.

Preferably, both ends of the quantitative loop are respectively communicated with two adjacent threaded holes on the valve stator.

The invention provides a valve rotor, a rotary switching valve and a chromatographic analysis instrument. By setting the valve rotor to be a multi-layer structure, the flow paths on the surface of the rotor are adjusted to different levels inside the rotor, so that only a hole structure is left on the end face, so that the stator It is completely symmetrical with the two end faces of the rotor. When in use, the symmetrical structure minimizes the wear of the two end faces and has a long service life;

Because the rotor and stator of the rotary switch valve are of hole-to-hole structure, the pressure between the end faces generated in the high pressure state is reduced to several times the original, thereby greatly reducing the pressure difference between high pressure and normal pressure to the rotation generated. Influence, because the possibility of liquid leakage from the hole to the rotor edge is much lower than that of the arc-shaped groove structure, it is more effective to prevent the possibility of liquid leakage from the end face of the switching valve at high pressure;

The multi-layer rotor structure is adopted. Since the bottom layer of the rotor is provided with a multi-layer structure under the top layer as the flow channel guide groove, the working mode of the complex flow path can be realized, especially the cross structure that cannot be achieved by the traditional valve rotor flow groove. way can be easily solved.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic structural diagram of a six-way valve rotor and a stator in the prior art;

2 is a schematic structural diagram of an embodiment of the valve rotor of the present invention;

3 is a schematic structural diagram of an embodiment of the valve rotor of the six-way valve of the present invention;

Fig. 4 is the front view structure schematic diagram of Fig. 3;

5 is a schematic structural diagram of an embodiment of the valve rotor of the three-way valve of the present invention;

Fig. 6 is the front view structure schematic diagram of Fig. 5;

7 is a schematic structural diagram of another embodiment of the valve rotor of the six-way valve of the present invention;

Fig. 8 is the front view structure schematic diagram of Fig. 7;

9 is a schematic structural diagram of an embodiment of the valve rotor of the seven-way valve of the present invention;

10 is a schematic structural diagram of an embodiment of the valve rotor of the eight-way valve of the present invention;

11 is a schematic structural diagram of another embodiment of the valve rotor of the eight-way valve of the present invention;

12 is a schematic structural diagram of the valve rotor and the valve stator of the rotary switching valve of the present invention;

Figure 13 is a schematic diagram of the six-way valve rotary circulation mode of the present invention;

Fig. 14 is another schematic diagram of the rotary circulation mode of the six-way valve of the present invention;

Fig. 15 is the schematic diagram of the prior art six-way valve loading sample in the application of chromatographic analysis instrument;

Figure 16 is a schematic diagram of the prior art six-way valve injecting samples in the application of chromatographic analysis instruments;

Figure 17 is a schematic diagram of the six-way valve of the present invention for sample loading in the application of a chromatographic analysis instrument;

FIG. 18 is a schematic diagram of the six-port valve of the present invention for sample injection in the application of chromatographic analysis instruments.

In the figure: 1, valve stator; 11, end face of valve stator; 111, hole; 2, valve rotor; 21, rotor top layer; 211, hole structure; 22, rotor bottom layer; 221, first layer; 2211, first slot ; 2221, the second groove; 222, the second level; 23, the sealing layer; 24, the end face of the rotor top layer; 3, the rotary switch valve; 4, the syringe; 5, the mobile phase; 6, the quantitative loop; 7, the chromatographic column; 8, pump; 9, detector; 10, discharge end; 100, existing stator; 200, existing rotor; 300, arc groove; a, first flow hole; b, second flow hole; c, The third flow hole; d, the fourth flow hole; e, the fifth flow hole; f, the sixth flow hole; A, the first hole; B, the second hole; C, the third hole; D, the fourth hole; E, the fifth hole; F, the sixth hole.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

A valve rotor, Fig. 2 is a schematic structural diagram of the valve rotor of this embodiment, as shown in Fig. 2, including a rotor top layer 21 and a rotor bottom layer 22 arranged in sequence, wherein:

The rotor top layer 21 is provided with a plurality of hole structures 211, and each hole structure 211 extends downward along the end surface 24 of the rotor top layer to form a flow hole;

The bottom layer 22 of the rotor includes at least one layer, each layer is provided with one or more grooves, and each groove is set to communicate with at least one flow hole of the top layer 21 of the rotor. Compared with the prior art, this embodiment is successful. The traditional surface arc groove structure is changed to a valve rotor structure with multiple layers of different channels. By setting the valve rotor to adopt a multi-layer structure, the flow path on the surface of the valve rotor is adjusted to different levels inside the valve rotor, so that only the end face is left. The hole structure solves the pressure effect caused by the arc groove in the prior art, and reduces the possibility of liquid leakage when the switching valve is high pressure. This valve rotor is suitable for gas, liquid, high pressure or low pressure rotary switching valves, and is realized by 3D printing Other similar rotary switching valve structures.

As an optional embodiment, the bottom layer 22 of the rotor includes a first layer 221, and at least one first groove 2211 is provided on the first layer 221. The first groove 2211 is configured as a "one"-shaped groove, and the flow hole is connected to the "one"-shaped groove. In actual production or use, the shape of the groove is set according to the number of multi-port valve holes and the actual use needs, and it can also be designed into a criss-cross structure, V-shaped or other shapes.

FIG. 3 is a schematic structural diagram of an embodiment of the valve rotor of the six-way valve, and FIG. 4 is a schematic front view of FIG. 3. As shown in FIG. 3 and FIG. The centers of the hole structures 211 are respectively located at the vertices of the regular hexagon, and the bottom layer 22 of the rotor includes a first layer 221. The first layer 221 is provided with a plurality of first grooves 2211, and the first grooves 2211 communicate with two adjacent flow holes. The set "one" shape slot, or arc slot.

5 is a schematic structural diagram of an embodiment of the valve rotor of the three-way valve, and FIG. 6 is a schematic front view of the structure of FIG. 5 , as shown in FIGS. , and a first groove 2211 may be provided on the first layer 221, and the first groove 2211 may be set as a "one"-shaped groove or an arc-shaped groove. It can be understood that, the rotor bottom layer 22 including the first layer 221 can be configured to communicate with two adjacent flow holes in the valve rotor with three channels to multiple channels.

As an optional embodiment, the bottom layer 22 of the rotor further includes at least one second layer 222, the at least one second layer 222 is sequentially arranged at the bottom of the first layer 221, and the second layer 222 is provided with at least one second groove 2221. The second slot 2221 is set as a "one"-shaped slot, a "T"-shaped slot or a "Y"-shaped slot, and can also be set into other shapes according to actual needs. The flow hole is communicated with the end of the second slot 2221. The rotor bottom layer 22 of the The multi-layer rotor structure can be realized very easily. Therefore, the rotary valve formed by the multi-layer rotor structure has very large extension space and practicality.

As an optional embodiment, a sealing layer 23 is also included, and the sealing layer 23 is disposed at the bottom of the rotor bottom layer 22 for sealing the rotor bottom layer. The rotor top layer 21 , the rotor bottom layer 22 and the sealing layer 23 are arranged in a detachable connection. Specifically, the sealing layer 23 is provided with a convex column, and the rotor top layer 21 and the rotor bottom layer 22 are provided with column holes. When in use, the convex column is provided. The columns are inserted into the corresponding column holes provided on the bottom layer 22 of the rotor and the top layer 21 of the rotor, and are sealed and matched. Since the multi-layer structure of the valve rotor 2 adopts independent components, when any components are damaged, it is only necessary to replace the independent components. The valve rotor part is enough, and other parts are not affected, which brings great convenience to manufacturers of rotary switching valves to upgrade products and users to replace parts, and minimizes the cost of transformation and use.

As an optional embodiment, the hole structures 211 are arranged on a regular polygon, and the centers of the hole structures 211 are located at the vertices of the regular polygon, respectively. In the actual use process, the valve rotors can be connected by arrangement and combination according to actual use needs. Arbitrary flow holes can be set to various forms of grooves. The bottom layer of the rotor can also be set to include multiple second layers according to the needs of use, or complex cross flow paths can be designed to meet different use needs. This valve rotor structure is suitable for Three-way to multi-channel high pressure liquid and gas rotary switching valve structure.

FIG. 7 is a schematic structural diagram of an embodiment of the valve rotor of the six-way valve, and FIG. 8 is a front structural schematic diagram of FIG. 7 . As shown in FIGS. 7 and 8 , there are six hole structures 211 on the top layer 21 of the rotor. The centers of the hole structures 211 are respectively located at the vertices of the regular hexagon, and the rotor bottom layer 22 includes a first layer 221 and a second layer 222, wherein: the first layer 221 is provided with a first groove 2211 parallel to each other; the second layer 222 There is a second groove 2221 perpendicular to the first groove 2211 on the first layer 221. The first groove 2211 and the second groove 2221 are both set as "one"-shaped grooves. Specifically, in this embodiment, the "one"-shaped groove The end face of the slot is set as a rounded rectangular structure, and the diameter of the hole structure 211 is the same as the diameter of the rounded corners in the rounded rectangle.

FIG. 9 is a schematic structural diagram of an embodiment of the valve rotor of the seven-way valve. As shown in FIG. 9 , there are seven hole structures 211 on the top layer 21 of the rotor, and the centers of the hole structures 211 are respectively located at the vertices of the regular heptagon. In this embodiment, the rotor bottom layer is set to include a first layer 221 and a second layer 222, and the first groove 2211 on the first layer 221 is set as a "one"-shaped groove, and the end face of the "one"-shaped groove is set as a circle. Corner rectangular structure, the diameter of the hole structure 211 is the same as the diameter of the rounded corners in the rounded rectangle, the second groove 2221 on the second layer 222 is set as a "Y"-shaped groove, and the ends of the "Y"-shaped groove are set as circles and the diameter of the rounded corner is the same as the diameter of the hole structure 211 , the “Y”-shaped groove on the second layer 222 in this embodiment can also be designed as a “T”-shaped groove or other shapes.

FIG. 10 is a schematic structural diagram of an embodiment of the valve rotor of the eight-way valve. As shown in FIG. 10 , there are eight hole structures 211 on the top layer 21 of the rotor, and the centers of the hole structures 211 are located at the vertices of the regular octagon respectively, and The rotor bottom layer 22 includes a first layer 221 and a second layer 222, wherein: the first layer 221 is provided with first grooves 2211 parallel to each other; the second layer 222 is provided with the first groove 2211 on the first layer 221 perpendicular to The second groove 2221, the first groove 2211 and the second groove 2221 are all set as "one"-shaped grooves. Same diameter as the corners in a rounded rectangle.

FIG. 11 is a schematic structural diagram of another embodiment of the valve rotor of the eight-way valve. As shown in FIG. 11 , there are eight hole structures 211 on the top layer 21 of the rotor, and the centers of the hole structures 211 are located at the vertices of the regular octagon, respectively. The rotor bottom layer includes a first layer 221 and a second layer 222, and the first layer 221 is provided with a first groove 2211, and the second layer is provided with a second groove 2221. In this embodiment, the first groove 2211 and the second groove 2221 They are all set as "one"-shaped grooves. As shown in Figure 11, the first grooves 2211 include three, two of which are respectively connected to the adjacent circulation holes, and the other first groove 2211 is connected to the opposite circulation holes. And the first grooves 2211 communicating with the adjacent circulation holes are symmetrically arranged on both sides of the first grooves 2211 communicating with the opposite circulation holes; the second grooves 2221 are provided to communicate with the two alternate circulation holes.

Figure 12 is a schematic structural diagram of the valve stator and valve rotor in the rotary switching valve of this embodiment. As shown in Figure 12, a rotary switching valve includes the above-mentioned valve rotor 2 and valve stator 1. In this embodiment, the most commonly used And the most representative six-way valve, the valve stator 1 adopts the same structure as the existing valve stator, and the valve stator is provided with threaded holes. Specifically, the end face 24 of the rotor top layer of the valve rotor 2 is arranged symmetrically with the end face 11 of the valve stator, because the switching valve is completed by sliding the two end faces during operation. In order to ensure that the rotary switching valve can work under high pressure, the two end faces must be The pressure is very tight. In this embodiment, the end face 24 of the top layer of the rotor is completely symmetrical with the end face 11 of the valve stator, and the wear of the two end faces is minimized through the symmetrical structure, thereby improving the service life of the rotary switching valve;

The end face 11 of the valve stator is provided with a plurality of holes 111, the holes 111 communicate with the threaded holes, and the hole structure 211 of the top layer 21 of the valve rotor is set corresponding to the holes 111. Since the valve rotor 2 and the valve stator 1 of the rotary switching valve are a pair of holes The hole structure, and the hole structure on the end face of the top layer 21 of the valve rotor is exactly the same as the hole on the end face of the valve stator 1. The flow path is adjusted from the surface to the different layers inside the rotor, so that only the hole structure is left on the end face, which fundamentally solves the problem of the valve. The end face wear caused by the asymmetry of the stator and the valve rotor, and the uneven end face pressure caused by the rotation of the rotary switch valve when there is pressure and no pressure, and the arc groove structure is easy to leak liquid and cannot achieve complex flow path intersections Design and other problems, especially the cross structure that the traditional valve rotor adopts the arc groove impossible to achieve, can be easily solved by the method of multi-layer rotor, and the pressure between the end faces generated in the high pressure state is reduced to the original level. Several times, thus greatly reducing the influence of the pressure difference between high pressure and normal pressure on rotation.

When the rotary switch valve is in use, the rotor of the rotary switch valve is rotated 360/n, where n represents the number of channels. In this embodiment, the six flow holes of the six-way valve rotor are respectively a first flow hole a, a second flow hole b, a third flow hole c, a fourth flow hole d, a fifth flow hole e and a sixth flow hole Hole f, the six holes of the six-way valve stator are the first hole A, the second hole B, the third hole C, the fourth hole D, the fifth hole E, and the sixth hole F respectively.

13 and 14 are schematic diagrams of the structure of the six-way valve in the present embodiment, wherein: the solid line connecting line indicates the state where the multilayer structure connects two holes, and the dotted line connecting line indicates that the multilayer structure can be realized As shown in Figure 13, it is a state of the six-way valve: at this time, the second flow hole b communicates with the sixth flow hole f, the third flow hole c communicates with the fifth flow hole e, and the first flow hole The hole a communicates with the fourth flow hole d, and the first hole A, the second hole B, the third hole C, the fourth hole D, the fifth hole E, and the sixth hole F of the valve stator are respectively connected with the first flow hole a. The second flow hole b, the third flow hole c, the fourth flow hole d, the fifth flow hole e and the sixth flow hole f are in one-to-one correspondence.

When the rotor rotates 60 degrees clockwise, as shown in Figure 14, the six-way valve switches to another state: at this time, the first flow hole a is connected to the fourth flow hole d, and the second flow hole b is connected to the sixth flow hole f is in communication, the third flow hole c is in communication with the fifth flow hole e, the first hole A of the valve stator and the sixth flow hole f of the valve rotor, the second hole B of the valve stator and the first flow hole a of the valve rotor, The third hole C of the valve stator and the second flow hole b of the valve rotor, the fourth hole D of the valve stator and the third flow hole c of the valve rotor, the fifth hole E of the valve stator and the fourth flow hole d of the valve rotor , The sixth hole F of the valve stator corresponds to the fifth flow hole e of the valve rotor one-to-one.

However, the prior art six-way valve uses an arc-shaped groove to connect the two holes. When the rotary switching valve works under high pressure, the overpressure on the two end faces can reach up to 50MPa, and this pressure will cause the two end faces to be opposite to each other. If the pressure is too high, it will cause the leakage of the switching valve.

When the system pressure is constant, the magnitude of the pressure on the two end faces is proportional to the force-bearing surface. Therefore, the difference between the present invention and the prior art can be compared by calculation.

In the prior art, arc grooves are used, and the formula for the total area of the arc is: S=(S ₁ -S ₂ )+S ₃ ;

S ₁ =nπr ₁ ² /360;

S ₂ =nπr ₂ ² /360;

S ₃ =πr ₃ ² .

Among them: n is the angle of the arc groove, r1 is the radius of the long arc, r2 is the radius of the short arc, and r3 is the radius of the two semicircles on both sides of the arc. S1 is the fan-shaped area formed by the outer edge of the 60-degree arc-shaped groove, S2 is the fan-shaped area formed by the inner edge of the 60-degree arc-shaped groove, and S3 is the area formed by the two half-holes. Let's assume the diameter of the hole is 1mm and the radius of the arc is 3mm.

The area of the arc slot is:

S ₁ =nπr ₁ ² /360=60/360x3.14x3.5 ² =6.41mm ² ;

S ₂ =nπr ₂ ² /360=60/360x3.14x2.5 ² =3.27mm ² ;

S ₃ =πr ₃ ² =3.14x0.5 ² =0.785;

S=(6.41-3.27)+0.785=3.925;

The area sum of the surface holes in this example is:

2xS ₃ =2πr ₃ ² =2x3.14x0.5 ² =1.57;

Pressure formula: F=PS

If the system pressure is 40MPa, that is 4kg/mm ² .

Let: F ₁ be the pressure of the rotor in the prior art;

F ₂ is the pressure of the rotor of the patented technology of the present invention;

F ₁ =4kg/mm ² x5.7148mm ² =22.86Kg;

F ₂ =4kg/mm ² x1.57mm ² =6.28Kg;

It can be seen from the calculation results that the pressure difference between the two structures is 3.64 times, that is, the influence of the system pressure on the end face is also 3.64 times different. Therefore, the advantages of the rotary switch valve in this embodiment are very obvious.

Because the switching valve works under high pressure, the sealing is the most important indicator of the switching valve. From the above analysis, the plane area of the arc groove is 3.64 times that of the hole, and the larger the area is under high-pressure working conditions, the greater the possibility of liquid leakage at its edge. In the application of multi-way switching valve, the number of arc grooves will also increase (for example, the number of arc grooves of 13-way switching valve reaches 6), which increases the chance of liquid leakage to a greater extent. For example, the original arc grooves on the surface are adjusted to different levels of the rotor, leaving only the same hole structure as the stator on the surface, which obviously minimizes the possibility of liquid leakage of the switching valve.

A chromatographic analysis instrument, including the above-mentioned rotary switching valve, is used for high and low pressure sampling in the chromatographic analysis instrument. The mobile phase 5 , the quantitative loop 6 and the chromatographic column 7 are connected to the switching valve 3 , wherein: a pump 8 is provided between the mobile phase 5 and the rotary switching valve 3 ; the chromatographic column 7 is connected to the detector 9 .

As an optional embodiment, the two ends of the quantitative loop 6 are respectively connected to two adjacent flow holes, and the two adjacent flow holes of the quantitative loop 6 are connected to each other to realize micro-sample injection, which solves the problem of existing The problem of difficulty in micro-injection of chromatographic instruments in technology.

Fig. 15 is a schematic diagram of the prior art six-way valve in the application of chromatographic analysis instrument sample loading, as shown in Fig. 15, the working principle is: the pump 8 passes the mobile phase 5 of the chromatography through the fourth flow hole d of the six-way valve and The fifth flow hole e is pushed into the chromatographic column 7 for separation, and the background detection signal when there is no sample is sent to the detector 9 for detection. The syringe 4 sends the test sample to the sample loop 6 through the second flow hole b and the third flow hole c of the six-way valve, and the excess sample passes through the sixth flow hole f and the first flow hole a of the six-way valve through the discharge end. 10 is discharged, and the quantitative sample is retained in the sample loop;

After rotating the six-way valve clockwise by 60°, it rotates to another state. Figure 16 is a schematic diagram of the prior art six-way valve in the application of chromatographic analysis instruments. As shown in Figure 16, the pump 8 will The mobile phase 5 pushes the sample retained in the quantitative loop 6 into the chromatographic column 7 through the sixth flow hole f and the fifth flow hole e through the fourth flow hole d and the third flow hole c of the six-way valve for separation. The latter detection signal is sent to the detector 9 for detection, and the system completes one sample injection and detection.

In this embodiment, Fig. 17 is a schematic diagram of the sample loading of the six-port valve in the application of the chromatographic analysis instrument in this embodiment. As shown in Fig. 17, the working principle is: the pump 8 passes the mobile phase 5 of the chromatography through the six-port valve. The first flow hole a and the third flow hole c are pushed into the chromatographic column 7 for separation, and the background detection signal when there is no sample is sent to the detector 9 for detection. The syringe 4 sends the test sample to the sample loop 6 through the second flow hole b and the fifth flow hole e of the six-way valve, and the excess sample passes through the discharge end through the sixth flow hole f and the fourth flow hole d of the six-way valve. 10 is discharged, and the quantified sample remains in the sample loop.

After rotating the six-port valve clockwise by 60°, it rotates to another state. Figure 18 is the principle diagram of the six-port valve in the application of the chromatographic analysis instrument in this embodiment. As shown in Figure 18, the pump 8 will The mobile phase 5 pushes the sample retained in the quantitative loop 6 into the chromatographic column 7 through the sixth flow hole f and the third flow hole c through the first flow hole a and the fifth flow hole e of the six-way valve for separation, The separated detection signal is sent to the detector 9 for detection, and the system completes one sample injection and detection.

The quantitative loop 6 of the traditional six-port valve is fixed at both ends of the valve, so the length of the quantitative loop 6 cannot be too short. In this embodiment, the six-port valve is used in the chromatographic analysis instrument. The schematic diagram of sample loading and injection As shown in Fig. 17 and Fig. 18 respectively, in this embodiment, the two ends of the quantitative loop 6 are respectively connected to the two adjacent threaded holes on the valve stator 1, and the length of the quantitative loop can be greatly reduced. The pipeline can achieve an injection volume of less than 2 microliters, so as to achieve micro injection.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. A valve rotor, characterized in that it comprises a rotor top layer and a rotor bottom layer arranged in sequence, wherein: The rotor top layer is provided with a plurality of hole structures, and each of the hole structures extends downward along the end surface of the rotor top layer to form a flow hole; The rotor bottom layer includes at least one layer, each of which is provided with one or more grooves, and each of the grooves is configured to communicate with at least one flow hole of the rotor top layer. 2 . The valve rotor according to claim 1 , wherein the bottom layer of the rotor comprises a first layer, and at least one first groove is formed on the first layer, and the flow hole is connected to the first groove. 3 . End connection settings. 3 . The valve rotor according to claim 2 , wherein the bottom layer of the rotor further comprises at least one second layer, and the at least one second layer is sequentially arranged at the bottom of the first layer, and the second layer is arranged in sequence. 4 . At least one second groove is arranged on the surface, and the flow hole is communicated with the end of the second groove. 4 . The valve rotor according to claim 3 , further comprising a sealing layer, and the sealing layer is disposed on the bottom of the bottom layer of the rotor. 5 . 5. The valve rotor according to claim 3 or 4, wherein the first slot is set as a "one"-shaped slot; the second slot is set as a "one"-shaped slot, a "T"-shaped slot or "Y" shaped slot. 6 . The valve rotor according to claim 1 , wherein the hole structures are arranged on a regular polygon, and the centers of the hole structures are respectively located at the vertices of the regular polygon. 7 . 7. A rotary switching valve, characterized in that it comprises the valve rotor according to any one of claims 1-6, and also comprises a valve stator, wherein: The end face of the rotor top layer of the valve rotor is symmetrically arranged with the end face of the valve stator; A plurality of holes are provided on the end surface of the valve stator, and the hole structures on the top layer of the valve rotor are arranged in a one-to-one correspondence with the holes. 8. A chromatographic analysis instrument, characterized in that it comprises the rotary switching valve of claim 7. 9. The chromatographic analysis instrument according to claim 8, further comprising a syringe and a mobile phase, a quantitative loop and a chromatographic column connected with the rotary switching valve, wherein: A pump is provided between the mobile phase and the rotary switching valve; The chromatographic column is connected to the detector. 10 . The chromatographic analysis instrument according to claim 9 , wherein the two ends of the quantitative loop are respectively communicated with two adjacent threaded holes on the valve stator. 11 .

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