Switching valve head and switching valve for liquid chromatography

Abstract

The utility model discloses a liquid chromatogram switching valve head and a switching valve, and relates to the technical field of fine parts, the liquid chromatogram switching valve head comprises a valve head shell, a rotor, a rotating shaft and an elastic piece, the valve head shell is internally provided with a mounting cavity, and the valve head shell is provided with a first liquid channel and a plurality of second liquid channels; the top end of the rotating shaft is arranged in the mounting cavity, and the rotor is coaxially arranged at the top end of the rotating shaft; the elastic piece is arranged in the mounting cavity and is used for applying upward thrust to the rotating shaft; due to the fact that the elastic piece exerting upward thrust on the rotating shaft is arranged in the installation cavity, when abrasion occurs between the rotor and the valve head shell, the acting force of the elastic piece enables the rotating shaft to move upwards, the rotor moves upwards, compensation is completed, and liquid leakage is reduced. The elastic piece can enable the top face of the rotor and the valve head shell to be kept in an attached state, the sealing performance is further improved, and liquid leakage is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to fine parts technical field, concretely is the switching valve head and switching valve of liquid chromatography. BACKGROUND

[0002] High performance liquid chromatography is an important branch of chromatography, with liquid as mobile phase, using high pressure liquid delivery system, single solvent or mixed solvent of different proportion, buffer solution and other mobile phase are pumped into the chromatographic column with stationary phase, after each component is separated in the column, into the detector for detection, thereby realizing the analysis of sample. The system structure of high performance liquid chromatography includes liquid reservoir, pump, sample injector, chromatographic column, detector, recorder and several parts. The mobile phase in the liquid reservoir is pumped into the system by the high pressure pump, the sample solution enters the mobile phase through the sample injector, is carried into the chromatographic column (stationary phase) by the mobile phase, because each component in the sample solution has different distribution coefficient in two phases, when the two phases move relatively, after repeated adsorption-desorption distribution process, each component produces great difference in moving speed, is separated into single component and flows out from the column, when passing through the detector, the sample concentration is converted into electric signal and transmitted to the recorder, and the data is printed in the form of atlas.

[0003] With the development of chromatography, higher and more complex requirements are put forward for the switching valve, the switching of the switching valve in the prior art is realized by the rotation of the rotor, and the relative rotation between the rotor and the valve head will produce friction; long time operation is easy to cause the connection between the valve head and the rotor to be not tight, causing the tightness of the valve body to be insufficient, greatly affecting the service life of the switching valve, and also affecting the detection result.

[0004] Therefore, the switching valve head and switching valve of liquid chromatography are needed. UTILITY MODEL CONTENT

[0005] In view of the problems in the prior art, the utility model solves the problems by the following technical structure.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] The switching valve head of liquid chromatography comprises a valve head shell, a rotor, a rotating shaft and an elastic member, the valve head shell is provided with a mounting cavity, the valve head shell is provided with a first liquid channel and a plurality of second liquid channels, the first liquid channel and the plurality of second liquid channels extend from the outside of the valve head shell to the top end of the mounting cavity,

[0008] The top end of the rotating shaft is arranged in the mounting cavity, the rotor is coaxially arranged at the top end of the rotating shaft, a strip-shaped slot passing through the rotor axis is arranged at the top end of the rotor, the opening of the first liquid channel is coaxial with the rotor, and the strip-shaped slot sequentially passes through the bottom of the opening of the second liquid channel when the rotating shaft drives the rotor to rotate.

[0009] The elastic member is arranged in the mounting cavity, and the elastic member is used for applying upward thrust to the rotating shaft.

[0010] Further features are,

[0011] The top end of the rotating shaft is provided with a mounting seat, and the rotor is arranged at the top end of the mounting seat.

[0012] The top end of the mounting seat is provided with a plurality of positioning pins arranged along the axial direction of the rotating shaft, and the rotor is arranged on the mounting seat through the positioning pins.

[0013] The bottom opening of the mounting cavity is provided with a bearing, and the rotating shaft is arranged on the bearing.

[0014] The elastic member is a disc spring group, and the disc spring group is composed of a plurality of disc springs arranged from top to bottom.

[0015] A plurality of disc springs are sleeved on the rotating shaft, and the disc spring group is arranged between the bearing and the mounting seat.

[0016] A plurality of second liquid channels are uniformly distributed in the annular direction of the first liquid channel.

[0017] A switching valve comprises a switching valve head of a liquid chromatograph.

[0018] Further comprising a motor, a main body and a flexible connecting shaft, the flexible connecting shaft is arranged at the output end of the motor, and the suspended end of the flexible connecting shaft is connected with the rotating shaft.

[0019] The output end of the motor is annularly provided with an induction sheet, and the main body is provided with a photoelectric sensor matched with the induction sheet.

[0020] The above structure of the utility model can achieve the following beneficial effects:

[0021] In use, the first liquid channel is connected with the liquid inlet pipe, and the second liquid channel is connected with the liquid outlet pipe; the rotor is rotated by rotating the rotating shaft, and since the first liquid channel is always in communication with the strip-shaped groove, and when the rotor rotates, the strip-shaped groove sequentially passes through the bottom of the opening of the plurality of second liquid channels, therefore, when switching is needed, only the rotor is rotated to make the strip-shaped groove be located at the bottom of the opening of the corresponding second liquid channel, and the switching is completed; since the elastic member for applying upward thrust to the rotating shaft is arranged in the mounting cavity, when wear occurs between the rotor and the valve head shell, the force of the elastic member makes the rotating shaft move upward, and the rotor moves upward to complete compensation, and the occurrence of liquid leakage is reduced, and the elastic member can keep the top surface of the rotor and the valve head shell in the state of adhesion, and the sealing performance is further improved, and liquid leakage is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure sectional view of the embodiment one;

[0023] Figure 2 It is a structure schematic view of the rotor in the embodiment one;

[0024] Figure 3 It is a structure schematic view of the embodiment two.

[0025] In the figure: 1, valve head; 11, first liquid channel; 12, second liquid channel; 13, liquid leakage channel; 2, rotor; 21, strip-shaped groove; 3, rotating shaft; 31, mounting seat; 4, elastic member; 5, positioning pin; 6, bearing; 7, motor; 71, inductive sheet; 8, main body; 81, photoelectric inductor; 9, flexible connecting shaft. DETAILED DESCRIPTION

[0026] In order for the person skilled in the art to better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0027] It should be noted that the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusion, for example, a process, method, device, product or equipment including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or equipment.

[0028] The following will be described in combination with the drawings Figures 1-3This application will be described in further detail.

[0029] Example 1, Reference Figures 1-2 The switching valve head of the liquid chromatograph shown includes: valve head housing 1, rotor 2, rotating shaft 3, and elastic element 4. The valve head housing 1 is provided with an installation cavity. The valve head housing 1 is provided with a first liquid channel 11 and a plurality of second liquid channels 12. The first liquid channel 11 and the plurality of second liquid channels 12 extend from the outside of the valve head housing 1 to the top of the installation cavity.

[0030] The top end of the rotating shaft 3 is located in the mounting cavity, and the rotor 2 is coaxially located at the top end of the rotating shaft 3. The top end of the rotor 2 is provided with a strip groove 21 that passes through the axis of the rotor 2 (that is, the strip groove 21 extends radially along the rotor 2). The opening of the first liquid channel 11 is coaxial with the rotor 2. When the rotating shaft 3 drives the rotor 2 to rotate, the strip groove 21 passes through the bottom of the openings of multiple second liquid channels 12 in sequence.

[0031] The elastic element 4 is disposed in the mounting cavity and is used to apply an upward thrust to the rotating shaft 3.

[0032] Based on the above features, during use, the first liquid channel 11 is connected to an inlet pipe, and the second liquid channel 12 is connected to an outlet pipe. Rotation of the shaft 3 causes the rotor 2 to rotate. Since the first liquid channel 11 is always connected to the strip groove 21, and the strip groove 21 passes sequentially through the bottom of the openings of multiple second liquid channels 12 when the rotor 2 rotates, switching can be completed simply by rotating the rotor 2 so that the strip groove 21 is located at the bottom of the opening of the corresponding second liquid channel 12. Because the mounting cavity is equipped with an elastic element 4 that applies an upward thrust to the shaft 3, when wear occurs between the rotor 2 and the valve head housing 1, the force of the elastic element 4 causes the shaft 3 to move upward, thus causing the rotor 2 to move upward, compensating for wear and reducing the occurrence of leakage. Furthermore, the elastic element 4 keeps the top surface of the rotor 2 in contact with the valve head housing 1, further improving sealing and preventing leakage.

[0033] like Figure 1 As shown, in order to connect the rotor 2 and the shaft 3, a mounting base 31 is provided at the top of the shaft 3. Several positioning pins 5 are provided at the top of the mounting base 31 along the axial direction of the shaft 3. The rotor 2 is mounted on the mounting base 31 through the positioning pins 5, so that the rotor 2 is driven to rotate by the shaft 3.

[0034] like Figure 1As shown, in order to make the rotating shaft 3 rotate smoothly, the bottom opening of the installation cavity is provided with a bearing 6, and the rotating shaft 3 is arranged on the bearing 6. In the embodiment, a disc spring group composed of a plurality of disc springs arranged from top to bottom is selected as the elastic member 4. In this way, a plurality of disc springs can be sleeved on the rotating shaft 3, and the disc spring group is arranged between the bearing 6 and the mounting seat 31, so that the mounting seat 31 is always subjected to an upward thrust. In addition, the number of disc springs can be updated according to the wear condition, so as to ensure that the thrust is sufficient.

[0035] Further optimization is that, in order to facilitate control, a plurality of second liquid channels 12 are uniformly distributed in the circumferential direction of the first liquid channel 11.

[0036] Further optimization is that, as shown, Figure 1 When liquid leaks in the installation cavity, it can be discharged through the liquid leakage channel 13 arranged in the circumferential direction of the installation cavity. The liquid leakage channel 13 extends from the installation cavity to the outside of the valve head shell.

[0037] Embodiment two, as shown in Figure 3 A switching valve, comprising the liquid chromatography switching valve head of embodiment one.

[0038] Further comprising a motor 7, a main body 8 and a flexible connecting shaft 9. The flexible connecting shaft 9 is arranged at the output end of the motor 7. The suspended end of the flexible connecting shaft 9 is connected with the rotating shaft 3 (the rotating shaft 3 and the flexible connecting shaft 9 can be slidably sleeved to meet the dual purpose of wear compensation of the rotor 2 and driving the rotating shaft 3 to rotate). The flexible connecting shaft 6 has the effect of vibration absorption and damping, which ensures the stable and reliable operation of the whole machine.

[0039] As shown in Figure 2 The output end of the motor 7 is provided with an inductive sheet 71, and the main body 8 is provided with a photoelectric inductor 81 matched with the inductive sheet 71. The photoelectric inductor 81 senses the rotation angle of the rotating shaft 3 through the equicircumferentially distributed notches on the inductive sheet 71. In this way, the valve rotor 2 can be controlled to rotate to the appropriate position, and the first liquid flow channel 11 and the corresponding first liquid flow channel 12 are connected.

[0040] In summary, in use, the first liquid channel 11 is connected with the liquid inlet pipe, and the second liquid channel 12 is connected with the liquid outlet pipe; the rotor 2 is rotated by rotating the rotating shaft 3, the first liquid channel 11 is always in communication with the strip-shaped groove 21, and when the rotor 2 rotates, the strip-shaped groove 21 sequentially passes through the bottom openings of the plurality of second liquid channels 12, therefore, when switching is needed, the rotor 2 is only needed to be rotated to make the strip-shaped groove 21 be located at the bottom opening of the corresponding second liquid channel 12, and the switching is completed; the elastic member 4 is arranged in the installation cavity and applies an upward pushing force to the rotating shaft 3, when wear occurs between the rotor 2 and the valve head shell 1, the force of the elastic member 4 makes the rotating shaft 3 move upward, and the rotor 2 moves upward, compensation is completed, the occurrence of liquid leakage is reduced, and the elastic member 4 can keep the rotor 2 top surface and the valve head shell 1 in a state of adhesion, the sealing performance is further improved, and liquid leakage is avoided.

[0041] The above is only the preferred embodiment of the application, and the application is not limited to the above embodiment. It can be understood that other improvements and changes directly derived or thought of by those skilled in the art without departing from the spirit and concept of the application should be considered to be included in the protection scope of the application.

Claims

1. A switching valve head for liquid chromatography, characterized in that The utility model relates to a liquid chromatograph switching valve head, including: Valve head shell (1), rotor (2), pivot (3), elastic part (4), install the cavity in valve head shell (1), be provided with first liquid channel (11) and a plurality of second liquid channel (12) on valve head shell (1), first liquid channel (11) and a plurality of second liquid channel (12) all extend to the top of install cavity from the outside of valve head shell (1); The top of pivot (3) is arranged in install cavity, rotor (2) is coaxially arranged on the top of pivot (3), the top of rotor (2) is provided with strip slot (21) through the axis of rotor (2), the opening of first liquid channel (11) is coaxial with rotor (2), when pivot (3) drives rotor (2) to rotate, strip slot (21) passes the opening bottom of a plurality of second liquid channel (12) in turn; Elastic part (4) is arranged in install cavity, and elastic part (4) is used to apply the upward thrust to pivot (3).

2. The head for a switching valve of a liquid chromatograph according to claim 1, characterized in that: The top of pivot (3) is provided with mounting seat (31), and rotor (2) is arranged on the top of mounting seat (31).

3. The head for a switching valve of a liquid chromatograph according to claim 2, characterized in that: The top of mounting seat (31) is provided with a plurality of positioning pins (5) arranged along the axis of pivot (3), and rotor (2) is arranged on mounting seat (31) by positioning pin (5).

4. The head for a switching valve of a liquid chromatograph according to claim 3, characterized in that: The bottom opening of install cavity is provided with bearing (6), and pivot (3) is arranged on bearing (6).

5. The head for a switching valve of a liquid chromatograph according to claim 4, characterized in that: Elastic part (4) is disc spring group, and disc spring group is composed of a plurality of disc springs arranged from top to bottom.

6. The head for a switching valve of a liquid chromatograph according to claim 5, characterized in that: A plurality of disc springs are sleeved on pivot (3), and disc spring group is arranged between bearing (6) and mounting seat (31).

7. The head for a switching valve of a liquid chromatograph according to claim 1, characterized by: A plurality of second liquid channels (12) are uniformly distributed in the ring direction of first liquid channel (11).

8. A switching valve characterized by comprising: The utility model relates to a liquid chromatograph switching valve head.

9. The switching valve of claim 8, wherein Further comprising motor (7), main body (8) and flexible connecting shaft (9), flexible connecting shaft (9) is arranged on the output end of motor (7), and the suspended end of flexible connecting shaft (9) is connected with pivot (3).

10. The switching valve of claim 9, wherein The output end of motor (7) is provided with inductive sheet (71) in the ring direction, and photoelectric inductor (81) is arranged on main body (8) and is matched with inductive sheet (71).

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