Application device for liquid chromatogram high-pressure switching valve

Abstract

The utility model discloses an application device for a liquid chromatogram high-pressure switching valve, which is fixedly connected to a control device of the liquid chromatogram high-pressure switching valve and comprises a support component, a rotor component and a stator component, a two-step-shaped through hole is formed in the supporting assembly, and the rotor assembly is clamped to a first step and rotationally connected with the supporting assembly. The stator assembly covers the large opening end of the two-stage step-shaped through hole, a second-stage step is provided with a first bearing, the inner ring of the first bearing is connected with the end, close to the stator assembly, of the rotor assembly, a lining is sleeved with the end, away from the stator assembly, of the step-shaped through hole, and the end, away from the stator assembly, of the rotor assembly penetrates through the lining and extends out of the step-shaped through hole. The end face of the end, away from the lining, of the rotor assembly abuts against the stator assembly, a plurality of flow channels are formed in the stator assembly, and the rotor assembly is provided with a plurality of flow paths matched with the flow channels. And the rotor assembly is radially limited through the first bearing and the bushing, so that the stability of the rotor assembly during rotation is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid chromatography analysis instruments, in particular to an application device for a liquid chromatography high-pressure switching valve. Background Art

[0002] With the development and widespread application of liquid chromatography technology, the requirements for its analytical accuracy, stability and repeatability are becoming higher and higher. The high-pressure switching valve is one of the important components of liquid chromatographs, and its performance directly affects the analysis results.

[0003] After searching, the patent application number "CN202210903068.5" discloses "A high-pressure switching valve head and a high-pressure switching valve", which includes a body and an upper cover, a rotor and a stator are arranged between the body and the upper cover, the upper cover is provided with at least two channels, the stator is fixed on the upper cover, and is provided with a through hole that matches and communicates with the channels, and the rotor is provided with at least one connecting groove, each of which is suitable for connecting two adjacent channels; it also includes a valve core shaft, which is arranged in the body and connected to the rotor, and is used to drive the rotor to rotate; the rotor and the stator are made of a new composite material, and the friction between the rotor and the stator is less than 1.5N when the rotor and the stator rotate. The valve core shaft and the body of the device are only radially limited by the bearing located in the middle section of the valve core shaft, which may cause the valve core shaft to swing during the rotation process, and the working stability is not high, and it is easy to cause the hole position of the rotor to fail to accurately match the hole position of the stator, and it will also accelerate the wear between the valve core shaft and the body.

[0004] Therefore, there is an urgent need for an application device for a liquid chromatography high pressure switching valve that can solve the above problems. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a novel application device for a liquid chromatography high-pressure switching valve to solve the problem that the rotating shaft in the prior art is prone to swing.

[0006] The technical scheme of the utility model is: an application device for a liquid chromatography high pressure switching valve, fixedly connected to a control device of the liquid chromatography high pressure switching valve, comprising a support assembly, a rotor assembly and a stator assembly; the support assembly is provided with a secondary stepped through hole, the rotor assembly is engaged with the first step, and is rotatably connected with the support assembly; the stator assembly covers one end of the large opening of the secondary stepped through hole, the second step is provided with a first bearing, the inner ring of the first bearing is fixedly connected with one end of the rotor assembly close to the stator assembly, the end of the secondary stepped through hole away from the stator assembly is sleeved with a bushing, the end of the rotor assembly away from the stator assembly passes through the bushing and extends out of the stepped through hole and is fixedly connected with the control device; the end face of the rotor assembly away from the bushing abuts against the stator assembly, the stator assembly is provided with a plurality of flow channels, and the rotor assembly is provided with a plurality of flow channels matching the flow channels. Since the first bearing and the bushing are used to radially limit the two ends of the rotor assembly, the stability of the rotor assembly during rotation is improved.

[0007] Preferably, the rotor assembly comprises a rotating shaft and a rotor, and an end surface of the rotating shaft close to the stator assembly is provided with a special-shaped groove, and the rotor is engaged in the special-shaped groove, so that the rotor can rotate together with the rotating shaft.

[0008] Preferably, the rotating shaft is provided with a shoulder, and a disc spring and a second bearing are sleeved on the rotating shaft. One end of the disc spring abuts against the support assembly, and the other end of the disc spring abuts against the second bearing. One end of the second bearing away from the disc spring abuts against the shoulder. The disc spring provides an axial preload for the rotating shaft, and the second bearing is used to reduce friction when the rotating shaft rotates.

[0009] Preferably, the first bearing is a radial bearing, which is used to reduce the friction force when the rotor assembly rotates and provide radial limitation for the rotor assembly.

[0010] Preferably, the second bearing is a thrust bearing to facilitate relative rotation between the rotating shaft and the disc spring.

[0011] Preferably, a cleaning interface is further provided in the stator assembly, and the cleaning interface leads to the contact surface where the rotor assembly abuts against the stator assembly, so as to facilitate the daily maintenance of the application device.

[0012] Preferably, a positioning pin hole is provided at one end of the support assembly close to the stator assembly, and a corresponding hole is provided on the stator assembly.

[0013] A high-pressure switching valve includes the above-mentioned application device, which is the valve head of the high-pressure switching valve in the prior art. The application device is connected to the driving device and control device of the existing high-pressure switching valve for use.

[0014] Compared with the prior art, the advantages of the utility model are: the utility model proposes an application device for a liquid chromatography high-pressure switching valve, including a support assembly, a rotor assembly and a stator assembly; by setting up a secondary stepped through hole in the support assembly, the rotor assembly is engaged in the secondary stepped through hole, and a first bearing and a bushing are respectively set at both ends of the rotor assembly, and the first bearing and the bushing are used to radially limit the two ends of the rotor assembly, thereby improving the stability of the rotor assembly during rotation, indirectly strengthening the sealing between the rotor assembly and the stator assembly, and the first bearing and the bushing also reduce the wear caused by relative rotation between the rotor assembly and the support assembly.

[0015] The detailed structure of the present utility model is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the overall exploded view of the utility model;

[0017] Figure 2 It is a side sectional view of the utility model;

[0018] Figure 3 It is an exploded view of the support assembly of the utility model;

[0019] Figure 4 It is a side sectional view of the support assembly of the utility model;

[0020] Figure 5 An exploded view of the rotor assembly of the utility model;

[0021] Figure 6 This is a schematic diagram of the appearance of the stator assembly of the utility model;

[0022] The names of the components and their corresponding serial numbers are: 1. Support assembly; 11. Secondary stepped through hole; 111. First step; 112. Second step; 12. First bearing; 13. Bushing; 14. Locating pin; 2. Rotor assembly; 21. Rotating shaft; 22. Disc spring; 23. Second bearing; 3. Stator assembly; 31. Flow channel; 32. Cleaning interface. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. The following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. Example

[0024] See also Figure 1-6 , an application device for a liquid chromatography high-pressure switching valve, comprising a support assembly 1, a rotor assembly 2 and a stator assembly 3; a secondary stepped through hole 11 is provided in the support assembly 1, the rotor assembly 2 is engaged with the first step 111, and is rotatably connected to the support assembly 1; the stator assembly 3 covers one end of the large opening of the secondary stepped through hole 11, the second step 112 is provided with a first bearing 12, the inner ring of the first bearing 12 is fixedly connected to one end of the rotor assembly 2 close to the stator assembly 3, wherein the first bearing 12 The outer ring is connected with the support assembly 1 by interference fit, and the inner ring of the first bearing 12 is matched with the rotor assembly 2 by a small clearance, which is used for limiting and convenient for rotor replacement. The end of the secondary stepped through hole 11 away from the stator assembly 3 is sleeved with a bushing 13, and the end of the rotor assembly 2 away from the stator assembly 3 passes through the bushing 13 and extends out of the secondary stepped through hole; the end face of the rotor assembly 2 away from the bushing 13 is in contact with the stator assembly 3, and the stator assembly 3 is provided with a plurality of flow channels 31, and the rotor assembly 2 is provided with a plurality of flow paths matching the flow channels 31. The control device controls the rotation of the rotor assembly 2, so that the flow channels 31 in the stator assembly 3 switch to match different flow paths, and the communication between different flow channels 31 can be achieved; and the first bearing 12 and the bushing 13 are used to radially limit the two ends of the rotor assembly 2, thereby improving the stability of the rotor assembly 2 during rotation, and indirectly strengthening the sealing between the rotor assembly 2 and the stator assembly 3. The first bearing 12 and the bushing 13 also reduce the wear caused by the relative rotation of the rotor assembly 2 and the support assembly 1.

[0025] The application device is fixedly connected to a control device of a liquid chromatography high-pressure switching valve. The control device is a prior art device. One end of the rotor assembly 2 away from the stator assembly 3 passes through the bushing 13 and extends out of a secondary stepped through hole to be fixedly connected to the output shaft of the control device.

[0026] Specifically, the rotor assembly 2 includes a rotating shaft 21 and a rotor. The end surface of the rotating shaft 21 close to the stator assembly 3 is provided with a special-shaped groove, and the rotor is engaged in the special-shaped groove; the rotating shaft 21 is provided with a shaft shoulder, and a disc spring 22 and a second bearing 23 are sleeved on the rotating shaft 21. One end of the disc spring 22 abuts against the support assembly 1, and the other end of the disc spring 22 abuts against the second bearing 23. The end of the second bearing 23 away from the disc spring 22 abuts against the shaft shoulder. The disc spring 22 provides an axial preload for the rotating shaft 21, so that the end surface of the rotating shaft 21 is always in close contact with the stator assembly 3 to form a seal, and the second bearing 23 enables the rotating shaft 21 and the disc spring 22 to rotate relative to each other.

[0027] Specifically, the first bearing 12 is a radial bearing, which is used to provide radial limitation for the rotating shaft 21 and reduce the friction between the rotating shaft 21 and the supporting assembly 1, so that the rotating shaft 21 can rotate more smoothly.

[0028] Specifically, the second bearing 23 is a thrust bearing, which is used to provide axial limitation for the rotating shaft 21 and reduce the friction between the shoulder of the rotating shaft 21 and the disc spring 22, so that the rotating shaft 21 can rotate more smoothly.

[0029] Specifically, a cleaning interface is further provided in the stator assembly 3, and the cleaning interface 32 leads to the contact surface of the rotor assembly 2 and the stator assembly 3. When working, a water pipe is connected to the cleaning interface 32, and the water flow can clean and flush the contact surface of the rotor assembly 2 and the stator assembly 3.

[0030] Specifically, a positioning pin hole is provided at one end of the support assembly 1 close to the stator assembly 3, and a corresponding hole is provided on the stator assembly 3. The corresponding hole is a blind hole, and the positioning pin 14 can be used to locate the installation position of the support assembly 1 and the stator assembly 3. The blind hole can also make the surface of the stator assembly 3 beautiful.

[0031] Instructions for use: The application device is connected to a control device and a drive device, both of which refer to existing technologies. The drive device transmits power to the rotor assembly 2 of the application device via the control device. The rotor assembly 2 rotates a certain angle so that the interfaces at both ends of the flow path in the rotor assembly 2 match the interfaces of different flow channels 31 in the stator assembly 3, so that the different flow channels 31 are connected to each other, thereby realizing the switching of the flow channels 31.

[0032] The above is a specific implementation method of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the utility model according to the technical solution and concept of the utility model, which should be covered by the protection scope of the claims of the utility model.

Claims

1. An application device for a liquid chromatography high-pressure switching valve, comprising a support assembly (1), a rotor assembly (2) and a stator assembly (3); characterized in that: The support component (1) is provided with a secondary stepped through hole (11), the rotor component (2) is engaged with the first step and is rotatably connected to the support component (1); the stator component (3) covers the upper end of the secondary stepped through hole (11), the second step is provided with a first bearing (12), the inner ring of the first bearing (12) is fixedly connected to an end of the rotor component (2) close to the stator component (3), a bushing (13) is sleeved in an end of the secondary stepped through hole (11) away from the stator component (3), and an end of the rotor component (2) away from the stator component (3) passes through the bushing (13) and protrudes out of the secondary stepped through hole (11); an end surface of the rotor component (2) away from the bushing (13) abuts against the stator component (3), a plurality of flow channels (31) are provided in the stator component (3), and the rotor component (2) is provided with a plurality of flow paths matching the flow channels (31).

2. The application device for a liquid chromatography high pressure switching valve according to claim 1, characterized in that: The rotor assembly (2) comprises a rotating shaft (21) and a rotor (24); an end surface of the rotating shaft (21) close to the stator assembly (3) is provided with a special-shaped groove, and the rotor is engaged in the special-shaped groove.

3. The application device for a liquid chromatography high pressure switching valve according to claim 2, characterized in that: The rotating shaft (21) is provided with a shaft shoulder, and a disc spring (22) and a second bearing (23) are sleeved on the rotating shaft (21); one end of the disc spring (22) abuts against the support assembly (1), and the other end of the disc spring (22) abuts against the second bearing (23); and one end of the second bearing (23) away from the disc spring (22) abuts against the shaft shoulder of the rotating shaft (21).

4. An application device for a liquid chromatography high pressure switching valve according to any one of claims 1 to 3, characterized in that: The first bearing (12) is a radial bearing.

5. The application device for a liquid chromatography high pressure switching valve according to claim 3, characterized in that: The second bearing (23) is a thrust bearing.

6. An application device for a liquid chromatography high pressure switching valve according to any one of claims 1 to 3, characterized in that: A cleaning interface (32) is also provided in the stator assembly (3), and the cleaning interface (32) leads to a contact surface where the rotor assembly (2) abuts against the stator assembly (3).

7. An application device for a liquid chromatography high pressure switching valve according to any one of claims 1 to 3, characterized in that: A positioning pin hole (14) is provided at one end of the support assembly (1) close to the stator assembly (3), and a corresponding hole is provided on the stator assembly (3).

8. A high pressure switching valve, characterized in that: The invention comprises the application device described in any one of claims 1 to 7.

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