A valve control system for a pipetting device

Abstract

The utility model provides a valve control system for pipette device belongs to digital titrator technical field, including burette and the integrated seat of burette below, be equipped with piston in burette, the integrated seat is equipped with the flow channel of reagent bottle inside intercommunication, and the integrated seat includes the horizontal check valve of the communication with the outlet pipe, the vertical check valve of the communication with the inlet pipe and is used for switching burette intercommunication flow channel, horizontal check valve or the reversing valve of vertical check valve, horizontal check valve includes first valve seat, first valve ball and elastic member of abutment in proper order, first valve seat is equipped with first through -hole of the intercommunication reversing valve and outlet pipe, first through -hole passes through first valve ball seal, the other end of elastic member is fixed with the shell of outlet pipe, the utility model discloses through the setting of elastic member in horizontal check valve, makes the piston to move up and suck reagent, the liquid and air in guide pipe will not be sucked into burette.

Description

Technical Field

[0001] This utility model belongs to the field of digital titrator technology, and in particular relates to a valve control system for a pipetting device. Background Technology

[0002] In the use of digital titrators (pipettes), the reagent is first drawn from the reagent bottle into the burette using a piston, and then accurately titrated (transferred) to the target container by precise feeding of the piston. This process requires a valve control system to control the reagent flow.

[0003] Traditional valves are prone to leakage, causing reagent backflow and leakage, which directly affects the accuracy of the titrator. Utility Model Content

[0004] The purpose of this utility model is to provide a valve control system for a pipetting device, including a burette installed in a digital titrator and an integrated seat located below the burette. The burette is provided with a piston, and the integrated seat is provided with a flow channel communicating with the inside of a reagent bottle. The integrated seat is equipped with a horizontal check valve communicating with an outlet tube, a vertical check valve communicating with an inlet tube, and a reversing valve for switching the flow channel communicating with the burette, the horizontal check valve, or the vertical check valve.

[0005] The horizontal check valve includes a first valve seat, a first valve ball, and an elastic element that abut against each other in sequence. The first valve seat has a first through hole that connects the directional valve and the outlet pipe. The first through hole is sealed by the first valve ball. The other end of the elastic element is fixed to the housing of the outlet pipe.

[0006] Furthermore, the vertical check valve includes a second valve ball and a second valve seat arranged sequentially from top to bottom. The second valve seat has a second through hole that connects the reversing valve and the inlet pipe. The second through hole is sealed by the second valve ball.

[0007] Furthermore, the outer periphery of the integrated base is provided with a reversing valve handle for rotating the reversing valve. By rotating the reversing valve handle, the burette is connected to the flow channel, the first through hole, or the second through hole, respectively.

[0008] Furthermore, the elastic element is a spring.

[0009] Compared with the prior art, the beneficial effects of this utility model are mainly reflected in:

[0010] 1. The elastic element in the horizontal one-way valve prevents liquid and air in the guide tube from being drawn back into the burette when the piston moves upward to draw in reagents.

[0011] 2. The reversing valve and flow channel are designed so that when the piston moves down, the burette is connected to the reagent bottle alone, and the remaining liquid in the burette can return to the reagent bottle without conflicting with the vertical and horizontal check valves.

[0012] 3. This application uses PVDF material for the integrated seat and the housing of the one-way valve, PFA material for the directional valve, zirconium oxide material for the valve seat, and silicon nitride material for the valve ball to make the above components corrosion resistant.

[0013] 4. This application solves the problem of reagent leakage during movement by setting the valve ball and valve seat to fit tightly together. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a valve control system for a pipetting device after assembly with a reagent bottle, according to this utility model.

[0015] Figure 2 This is a cross-sectional schematic diagram of the horizontal check valve in the valve control system of this utility model.

[0016] Figure 3 This is a cross-sectional schematic diagram of the vertical check valve in the valve control system of this utility model.

[0017] Among them, 1. Burette; 2. Integrated base; 3. Outlet tube; 4. Inlet tube; 5. Reagent bottle; 6. Reversing valve handle; 21. First valve seat; 22. First valve ball; 23. Spring; 24. Second valve seat; 25. Second valve ball; 26. Baffle. Detailed Implementation

[0018] The following is a more detailed description of a valve control system for a pipetting device according to the present invention, with reference to the schematic diagrams, which illustrate preferred embodiments of the present invention. It should be understood that those skilled in the art can modify the present invention described herein while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the present invention.

[0019] like Figure 1 As shown, a valve control system for a pipetting device, specifically for a digital titrator, includes a burette 1 and an integrated base 2. The burette 1 is positioned above the integrated base 2 and is rotatably fixed to a reagent bottle 5 via the integrated base 2. A piston capable of vertical movement is provided inside the burette 1, and a flow channel connecting the burette 1 and the reagent bottle 5 is provided inside the integrated base 2.

[0020] The integrated base 2 is made of PVDF and integrates a reversing valve, a horizontal check valve located to the side of the reversing valve, and a vertical check valve located below the reversing valve. The vertical check valve is connected to the inlet pipe 4, which extends into the reagent bottle 5. The horizontal check valve is connected to the outlet pipe 3 to realize titration.

[0021] The reversing valve is made of PFA and has a sealing cylindrical surface. The reversing valve is press-fitted with a pre-set small hole in the integrated seat 2 to achieve a seal, and can be rotated by the reversing valve handle 6 located on the outer periphery of the integrated seat 2. By turning the reversing valve handle 6, the reversing valve is rotated, so that the small hole on the valve is connected with the small holes at different positions on the integrated seat 2, thereby switching the reagent flow direction.

[0022] Vertical check valve, such as Figure 3 As shown, the device includes a PVDF housing, a zirconia second valve seat 24, a silicon nitride second valve ball 25, and a PVDF baffle 26 for limiting movement. The second valve seat 24 and the second valve ball 25 are precision ground to ensure a tight, leak-free sealing surface between them.

[0023] Horizontal check valve, such as Figure 2 As shown, the valve includes a first valve seat 21 made of zirconium oxide, a housing made of PVDF, a first valve ball 22 made of silicon nitride, and a spring 23 made of Hastelloy C-276. The first valve seat 21 and the first valve ball 22 are precision ground to ensure that the sealing surfaces between them fit tightly and leak-free.

[0024] like Figure 3 As shown, when the stopcock in the burette moves upward, the reagent in the reagent bottle passes through the inlet tube, through the vertical one-way valve, and into the burette. At this time, the outlet tube must be in the closed state to prevent air or reagent from being drawn back into the burette.

[0025] When the stopcock in burette 1 moves down, the reagent previously drawn into burette 1 passes sequentially through the horizontal check valve and the outlet tube 3 into the target container. At this time, the inlet tube 4 must be in the closed state, and no reagent should flow into the reagent bottle 5.

[0026] The vertical check valve is installed vertically. Its internal second valve ball 25 is sealed to the second valve seat 24 due to gravity. When the piston in the burette 1 moves upward, the second valve ball 25 is pushed open by the upward-moving reagent and blocked by the baffle 26. Because the baffle 26 has a through-hole, the reagent enters the burette 1 through the through-hole. The horizontal check valve is installed horizontally. When the piston in the burette 1 moves upward, its internal first valve ball 22 is tightly sealed to the first valve seat 21 due to the pushing force of the spring 23 and the negative pressure during liquid aspiration, preventing air or reagent in the outlet tube 3 from being drawn back into the burette 1.

[0027] When the piston in burette 1 moves downward, the pressure applied by the piston to the reagent opens the first valve ball 22 of the horizontal one-way valve, allowing the reagent to enter the outlet tube 3 and drip into the target container. At this time, the second valve ball 25 of the vertical one-way valve is sealed against the second valve seat 24 due to the positive pressure in the integrated seat 1, preventing the reagent in burette 1 from flowing into reagent bottle 5.

[0028] When the reversing valve is in the above working state, its small orifice is connected to the horizontal hole of the integrated base 2, allowing the reagent to smoothly enter the outlet tube 3. When the titration is completed and there is residual reagent left in the burette 1, in order to save reagent, the reversing valve handle 6 can be turned to connect the small orifice of the reversing valve with the flow channel inside the integrated base 2, and then the piston can be moved down to push the reagent in the burette 1 back into the reagent bottle 5.

[0029] The above are merely preferred embodiments of this utility model and do not constitute any limitation on this utility model. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and contents disclosed in this utility model without departing from the scope of the technical solutions of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A valve control system for a pipetting apparatus, characterized in that, Installed in a digital titrator, it includes a burette and an integrated base located below the burette. The burette is equipped with a piston, and the integrated base is equipped with a flow channel communicating with the inside of a reagent bottle. The integrated base also integrates a horizontal check valve communicating with an outlet tube, a vertical check valve communicating with an inlet tube, and a reversing valve for switching the flow channel communicating with the burette, the horizontal check valve, or the vertical check valve. The horizontal one-way valve includes a first valve seat, a first valve ball, and an elastic element that abut against each other in sequence. The first valve seat has a first through hole that connects the reversing valve and the outlet pipe. The first through hole is sealed by the first valve ball. The other end of the elastic element is fixed to the housing of the outlet pipe.

2. The valve control system for a pipetting device according to claim 1, characterized in that, The vertical one-way valve includes a baffle, a second valve ball, and a second valve seat arranged sequentially from top to bottom. The baffle is used to limit the upward movement of the second valve ball. The second valve seat has a second through hole that connects the reversing valve and the inlet pipe. The second through hole is sealed by the second valve ball.

3. The valve control system for a pipetting device according to claim 1, characterized in that, The integrated base is provided with a reversing valve handle on its outer periphery. By rotating the reversing valve handle, the burette is connected to the flow channel, the first through hole, or the second through hole, respectively.

4. The valve control system for a pipetting device according to claim 1, characterized in that, The elastic element is a spring.

Images