A double-station pipettor leak detection device

Abstract

This utility model discloses a dual-station pipette sealing performance testing device, including a base. A dual-station staggered testing component is installed on the top of the base, and two sets of clamping components are also installed on the top of the base. The testing component includes a sealed box fixedly installed on the top of the base. Through the dual-station staggered testing component and the two sets of clamping components, a negative pressure environment is generated for the pipette via an air pump, exhaust pipe, sealed box, suction pipe, and docking seat. Using a Y-shaped suction pipe in conjunction with two sets of solenoid valves, independent control and staggered testing of the two testing stations can be achieved. During the testing process, the operator can test the pipette at one station while simultaneously loading and unloading the pipette at the other station, without waiting for the previous station to complete its testing. This significantly shortens the testing interval time, improves batch testing efficiency, and solves the problem of low efficiency in traditional single-station testing devices.

Description

Technical Field

[0001] This utility model relates to the field of pipette technology, and specifically to a device for testing the sealing performance of a duplex pipette. Background Technology

[0002] A pipette is a specialized instrument used in laboratories to accurately transfer small or small amounts of liquid. It is also often called a pipette gun. It mainly relies on the internal piston to generate negative pressure under the action of an air column to draw and expel liquid, rather than directly contacting or driving the liquid. The sealing of the internal structure of the pipette is the main manifestation of the pipette's working performance. The sealing directly affects the accuracy of the pipette. Therefore, a testing device is required to test the sealing of pipettes during the manufacturing process.

[0003] Existing pipette sealing performance testing devices typically generate a certain negative pressure through an exhaust mechanism. By observing the change in pressure over a certain period of time and verifying whether the change falls within the standard range, the sealing performance of the pipette is determined. However, the installation and fixing of the pipette before testing requires a certain amount of time, and the testing device can only install one set of pipettes. Each set of pipettes requires a waiting period before the pressure change can be observed. During this waiting period, no other procedures are performed, resulting in wasted time and hindering the improvement of the testing efficiency. Therefore, we need to propose a duplex pipette sealing performance testing device. Summary of the Invention

[0004] I. Technical problems to be solved This invention addresses the aforementioned deficiencies in existing technologies by proposing a dual-station pipette sealing performance testing device. Through the configuration of the testing components, the suction pipe is equipped with two air inlet pipes, each controlled by a set of solenoid valves. Each end of the two air inlet pipes is equipped with a docking seat for connecting with the pipette, and two sets of clamping components are provided, thus creating a dual-station testing effect. This allows the two stations to perform staggered testing. While one station is being tested, the waiting time can be used to remove and install the pipette at the other station, significantly shortening the waiting time and improving testing efficiency, thereby solving the problems mentioned in the background art.

[0005] II. Technical Solution To solve the above-mentioned technical problems, this utility model provides a dual-station staggered detection device for pipette sealing, including a base. A detection component for dual-station staggered detection is installed on the top of the base, and two sets of clamping components are also installed on the top of the base. The detection component includes a sealed box fixedly installed on the top of the base. An air pump is connected to the left side of the sealed box through an exhaust pipe. The bottom of the air pump is bolted to the top of the base. An air extraction pipe is connected to the front of the sealed box. A set of docking seats for connecting pipettes is connected to one end of each of the two air inlets of the air extraction pipe, and a set of solenoid valves is provided in the middle of each of the two air inlets of the air extraction pipe.

[0006] Preferably, a check valve is provided in the middle of the exhaust pipe, and a pressure gauge is installed at the top of the sealed box.

[0007] Preferably, the docking seat includes a support seat installed on the top of the base, and a docking plug connected to the air inlet end of the air extraction pipe is installed on the top of the support seat. The inner side wall of the docking plug is provided with a rubber ring.

[0008] Preferably, the clamping assembly includes a support rod fixedly installed on the top of the base, a support frame installed on the top of the support rod, a lead screw rotatably installed through the inner side wall of the support frame, and two sets of clamping plates connected to the middle of the lead screw by reverse thread.

[0009] Preferably, a set of sliding rods is fixedly installed on the inner side wall of the support frame, and one end of each of the two sets of clamping plates is slidably fitted onto the outer arc surface of the sliding rods.

[0010] Preferably, the clamping ends of the two sets of clamping plates are located directly above the docking seat, and a set of rubber pads are fixedly installed on the clamping surfaces of the two sets of clamping plates.

[0011] Preferably, a controller is provided on the top of the base, and the wiring ports of the controller are electrically connected to the air pump and one end of the two sets of solenoid valves through lines.

[0012] Preferably, the sealed box is equipped with a mechanical negative pressure safety valve.

[0013] III. Beneficial Effects Compared with existing technologies, this invention achieves dual-station testing through a single air pump and a sealed chamber system combined with two independently controlled pipelines. Compared with the traditional two independent testing systems, this significantly reduces equipment costs and space requirements. By incorporating a connector with a rubber ring, a rapid and reliable seal is ensured between the pipette's aspiration end and the testing pipeline, accommodating different pipette models, reducing operational difficulty, and avoiding misjudgments caused by interface leaks.

[0014] The clamping assembly, driven by a lead screw and reverse thread, allows for single-operation centering and clamping of the pipette, providing uniform clamping force, reliable fixation, and convenient operation. A controller automates the testing process, controlling air pump start / stop, solenoid valve switching, and pressure holding time. This not only improves testing efficiency but also eliminates human error, ensuring consistent and accurate test results. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the installation structure of the detection component of this utility model; Figure 3 This is an exploded view of the docking seat of this utility model; Figure 4 This is an exploded view of the clamping component of this utility model.

[0016] In the diagram: 1. Base; 2. Detection component; 21. Sealed box; 22. Exhaust pipe; 23. Air pump; 24. Suction pipe; 25. Connecting seat; 251. Support seat; 252. Connecting plug; 253. Rubber ring; 26. Solenoid valve; 27. Check valve; 28. Pressure gauge; 29. ​​Controller; 3. Clamping component; 31. Support rod; 32. Support frame; 33. Lead screw; 34. Clamping plate; 35. Slide rod; 36. Rubber pad. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but should not be used to limit the scope of this utility model. Example

[0018] Please see Figures 1-4 This utility model provides a dual-station liquid pipe sealing test device, including a base 1. A dual-station staggered test component 2 is installed on the top of the base 1. Two sets of clamping components 3 are also installed on the top of the base 1. The test component 2 includes a sealed box 21 fixedly installed on the top of the base 1. An air pump 23 is connected to the left side of the sealed box 21 through an exhaust pipe 22. The bottom of the air pump 23 is bolted to the top of the base 1. An air extraction pipe 24 is connected to the front side of the sealed box 21. One end of each of the two air inlets of the air extraction pipe 24 is connected to a docking seat 25 for docking the liquid pipe. A set of solenoid valves 26 is provided in the middle of each of the two air inlets of the air extraction pipe 24.

[0019] In use, the suction pipe 24 is Y-shaped, with each pipe controlled by a set of solenoid valves 26. One set of solenoid valves 26 is open while the other set is closed. Each end of the two air inlets of the suction pipe 24 is equipped with a docking seat 25 for connecting with the pipette, and two sets of clamping components 3 are provided, thus forming a dual-station staggered detection effect. This allows the two stations to perform staggered detection. While one station is being tested, the pipette in the other station can be removed and installed during the waiting time, greatly shortening the waiting time and improving detection efficiency. During detection, the air pump 23 is turned on to expel the air inside the sealed box 21. After a certain air pressure is formed inside the sealed box 21, the air pump 23 is turned off. After a period of time, the change in air pressure is observed to determine whether the sealing performance of the tested pipette meets the requirements.

[0020] A check valve 27 is provided in the middle of the exhaust pipe 22. A pressure gauge 28 is installed on the top of the sealed box 21. The direction of the check valve 27 is from the sealed box 21 to the air pump 23, which can effectively prevent the backflow of outside air or gas in the sealed box 21 after the air pump 23 stops working, and ensure the stability of the air pressure in the sealed box 21 during the test. A pressure gauge 28 is installed at the center of the top of the sealed box 21. The detection end of the pressure gauge 28 extends into the sealed box 21 to monitor the air pressure change in the sealed box 21 in real time. The operator can judge whether the pipette is sealed properly by reading the pressure gauge 28.

[0021] The docking seat 25 includes a support seat 251 mounted on the top of the base 1. A docking plug 252 connected to one air inlet end of the suction tube 24 is mounted on the top of the support seat 251. A rubber ring 253 is provided on the inner side wall of the docking plug 252. The support seat 251 is used to support and fix the suction tube 24. The docking plug 252 is used to connect to the suction tube 24 and to seal and connect with the pipette. The rubber ring 253 is made of silicone rubber material that is resistant to aging and has good elasticity. When the liquid aspiration end of the pipette is inserted into the docking plug 252, the rubber ring 253 forms a sealing buffer layer between the outer wall of the pipette and the inner wall of the docking plug 252, effectively filling the gap, ensuring the sealing of the docking point, and avoiding detection errors caused by loose docking.

[0022] The clamping assembly 3 includes a support rod 31 fixedly installed on the top of the base 1. A support frame 32 is installed on the top of the support rod 31. A lead screw 33 is rotatably installed through the inner side wall of the support frame 32. Two sets of clamping plates 34 are connected to the middle of the lead screw 33 by reverse thread.

[0023] A set of slide rods 35 is fixedly installed on the inner side wall of the support frame 32. One end of each of the two sets of clamping plates 34 is slidably fitted onto the outer arc surface of the slide rods 35. One end of each of the two sets of clamping plates 34 is provided with a sliding hole, and the plates are slidably fitted onto the outer arc surface of the slide rods 35 through the sliding hole. The slide rods 35 guide the movement of the clamping plates 34, prevent the clamping plates 34 from deflecting during the rotation of the screw 33, ensure that the two sets of clamping plates 34 move synchronously towards or in opposite directions, and improve the stability of the movement of the clamping plates 34.

[0024] The clamping ends of the two sets of clamping plates 34 are located directly above the docking seat 25, and a set of rubber pads 36 are fixedly installed on the clamping surfaces of the two sets of clamping plates 34. By setting the rubber pads 36, not only can the friction between the clamping plates 34 and the pipette be increased and the clamping stability be improved, but also the clamping plates 34 can be prevented from causing scratch damage to the outer wall of the pipette, while adapting to the clamping requirements of pipettes of different diameters.

[0025] A controller 29 is installed on the top of the base 1. The wiring ports of the controller 29 are electrically connected to one end of the air pump 23 and the two sets of solenoid valves 26 through the lines. The controller 29 is an operation panel with a single-chip microcomputer control module. Its surface is equipped with a display screen and control buttons. The operator can set the detection parameters (such as negative pressure value, detection time, etc.) through the controller 29, control the start and stop of the air pump 23, and control the alternating opening and closing of the two sets of solenoid valves 26 to realize the automated alternating detection of dual stations and reduce the intensity of manual operation.

[0026] In practical use: Before use, a self-test is required. At the same time, close both sets of solenoid valves 26, then turn on the air pump 23 to reduce the air pressure inside the sealed box 21 to a certain value, and then turn off the air pump 23. Check the air pressure gauge 28 to see if it changes to determine the sealing performance of the detection device itself. Avoid affecting the detection results due to the sealing performance of the detection component 2 itself, such as damage to the sealing performance of solenoid valve 26, check valve 27, pipelines, and interfaces. After the test is normal, start the pipette test. Insert the aspiration tip of one of the pipettes to be tested into the docking plug 252 of the left docking seat 25, ensuring that the aspiration tip of the pipette is in close contact with the rubber ring 253; rotate the screw 33 handwheel of the left clamping assembly 3 to drive the two sets of clamping plates 34 to move towards each other along the slide bar 35 until the rubber pad 36 is in close contact with the outer wall of the pipette, thus completing the fixation of the left pipette; similarly, fix the other pipette to be tested on the right docking seat 25; The detection parameters, such as negative pressure value and holding time, are set via the touchscreen of the controller 29. After setting, the start button is clicked to begin detection. The controller 29 first controls the right solenoid valve 26 to close and the left solenoid valve 26 to open, starting the air pump 23. The air pump 23 evacuates air from the sealed box 21 and the left pipette through the exhaust pipe 22, causing the pressure gauge 28 pointer to gradually decrease. When the pressure reaches the set negative pressure value, the controller 29 controls the air pump 23 to stop working, entering the holding stage. During the holding stage, the operator observes the reading of the pressure gauge 28. If the pressure gauge 28 reading is within the holding time... If the number of tests does not increase significantly, the left-side pipette is considered to be in good condition; otherwise, it is not. While the left-side pressure test is being conducted, the operator can prepare the right-side pipette, which is already fixed in place. After the left-side test is completed, the left-side solenoid valve 26 is closed, the right-side solenoid valve 26 is opened, and the air pump 23 is restarted. This causes the sealed chamber 21 to form a certain negative pressure again, after which the air pump 23 is turned off and the chamber enters the pressure holding state to test the right-side pipette for sealing. During this process, the operator can remove the pipette that has been tested on the left side and replace it with a new pipette to be tested, achieving dual-station staggered testing and improving efficiency.

[0027] The controller 29 can preset detection programs, such as a loop of detection at the left station and detection at the right station, and can automatically record and display whether the detection results of each station are qualified or not, and can issue an audible and visual alarm when the detection exceeds the tolerance. Example

[0028] Compared to Example 1, this example includes an interface on the sealed chamber 21 to install a spring-loaded one-way valve. When the negative pressure within the system exceeds this safety threshold, the valve automatically opens by compressing the spring, allowing outside air to enter the system and thus limiting the maximum negative pressure, providing protection. Once the pressure returns to normal, the spring automatically closes the valve, providing passive, electrical-free overpressure protection for the detection device and pipette, significantly improving the safety and reliability of the equipment and preventing accidental losses.

[0029] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A device for detecting the sealing performance of a duplex displacement fluid pump, characterized in that, include: The base (1) is equipped with a detection component (2) for dual-station staggered detection on its top and two sets of clamping components (3) are also installed on its top. The detection component (2) includes a sealed box (21) fixedly installed on the top of the base (1). An air pump (23) is connected to the left side of the sealed box (21) through an exhaust pipe (22). The bottom of the air pump (23) is bolted to the top of the base (1). An air extraction pipe (24) is connected to the front side of the sealed box (21). One end of each of the two air inlets of the air extraction pipe (24) is connected to a docking seat (25) for docking a pipette. A set of solenoid valves (26) is provided in the middle of each of the two air inlets of the air extraction pipe (24).

2. The double-station pipettor leak detection device of claim 1, wherein: The exhaust pipe (22) is provided with a check valve (27) in the middle, and a pressure gauge (28) is connected to the top of the sealed box (21).

3. The double-station pipettor leak detection device of claim 1, wherein: The docking seat (25) includes a support seat (251) installed on the top of the base (1). The top of the support seat (251) is equipped with a docking plug (252) that is connected to one air inlet of the air extraction pipe (24). The inner side wall of the docking plug (252) is provided with a rubber ring (253).

4. The double-station pipettor leak detection device of claim 1, wherein: The clamping assembly (3) includes a support rod (31) fixedly installed on the top of the base (1), a support frame (32) is installed on the top of the support rod (31), a lead screw (33) is rotatably installed through the inner side wall of the support frame (32), and two sets of clamping plates (34) are connected to the middle of the lead screw (33) by reverse thread.

5. The sealing performance testing device for a duplex displacement fluid dispenser according to claim 4, characterized in that: A set of slide rods (35) are fixedly installed on the inner side wall of the support frame (32), and one end of each of the two sets of clamps (34) is slidably fitted onto the outer arc surface of the slide rods (35).

6. The device for detecting the sealing performance of a duplex displacement fluid dispenser according to claim 4, characterized in that: The clamping ends of the two sets of clamping plates (34) are located directly above the docking seat (25), and a set of rubber pads (36) are fixedly installed on the clamping surfaces of the two sets of clamping plates (34).

7. The device for detecting the sealing performance of a duplex displacement fluid dispenser according to claim 1, characterized in that: The top of the base (1) is equipped with a controller (29), and the wiring ports of the controller (29) are electrically connected to one end of the air pump (23) and two sets of solenoid valves (26) through lines.

8. The dual position pipette leak detection device of claim 1, wherein: The sealed box (21) is equipped with a mechanical negative pressure safety valve.

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