Pipetting device with valve for collecting volatile gases

Abstract

The utility model discloses a kind of pipette with valve capable of collecting volatile gas, including funnel body, elastic sealing rubber strip, funnel lid, special-shaped pipeline, adsorption box and valve;Elastic sealing rubber strip is installed in funnel body interior, located funnel upper mouth inner wall one week, funnel body below is connected special-shaped pipeline, special-shaped pipeline is equipped with valve, open under liquid pressure state, automatically close when no liquid pressure, special-shaped pipeline is calabash-like or spiral pipeline, hole channel is connected adsorption box for adsorbing harmful volatile gas, which is arranged on the side of pipeline.The utility model can effectively realize liquid sealing transfer and prevent volatilization, and is suitable for safety protection equipment and volatile substance control when pipetting in various places such as laboratory.

Description

Technical Field

[0001] This utility model relates to a pipette with a valve that can collect volatile gases, belonging to the field of chemical experimental apparatus. Background Technology

[0002] Funnels are widely used as a fundamental tool for liquid transfer in precise laboratory operations, large-scale chemical production, and everyday household use. For example, in pathology, when transferring toxic liquids such as xylene and formalin to volumetric flasks using a regular funnel, the gap between the funnel and the flask neck causes the solution to drip along the flask. This dripping toxic solution can pose a threat to the safety of the work surface and personnel; furthermore, the evaporation of these toxic liquids into the air can cause harm to human health and serious environmental pollution. In chemical production, when volatile organic solvents are added to storage tanks via funnels, the large-area contact between the liquid and air leads to significant solvent evaporation, resulting in material waste and creating flammable and explosive safety hazards. Although existing technologies include funnel designs with sealing structures, such as the anti-evaporation safety funnel disclosed in Chinese patent CN219449304U, these designs are complex to assemble, inconvenient to maintain, and consist of multiple components. If any component is damaged, such as wear on the universal interface or loosening of the hinge, repair or replacement may require complete disassembly, making the operation cumbersome and limiting its applicability. Chinese patent CN222816860U discloses a pipetting device, which has a complex structure and requires a certain floor space. In practical use, it is prone to liquid residue, making cleaning and maintenance difficult and failing to meet the convenience requirements of high-frequency use scenarios. Some funnels achieve sealing through threaded engagement or rubber sealing rings, but such designs often have many limitations. The multi-layered nested structure of some sealed funnels leads to complex assembly processes and low production efficiency; the use of special sealing materials significantly increases manufacturing costs, causing product prices to exceed market expectations.

[0003] Current liquid transfer devices face three major technical challenges: First, existing sealing structures (such as fixed sealing rings and protective covers) have poor adaptability, making it difficult to tightly fit bottle necks of different sizes. This leads to easy leakage of liquid from gaps, polluting the operating environment and causing material waste. Second, for volatile liquids, traditional devices lack effective means to suppress evaporation. During the transfer process, the liquid comes into direct contact with air over a large area, resulting in loss of liquid components. Furthermore, the volatile gases may cause environmental pollution or safety hazards. Third, although some improved devices have sealing and anti-evaporation functions, their complex structure and numerous parts increase manufacturing costs and the difficulty of use and maintenance, making them inconvenient to carry and thus limiting their practicality.

[0004] Therefore, designing a new type of funnel that combines sealing and leak prevention with anti-evaporation performance, as well as simple structure, controllable cost, and strong practicality, has become an urgent industry pain point to be addressed. Utility Model Content

[0005] This invention provides a pipetting device with a valve that can collect volatile gases, effectively achieving sealed liquid transfer and preventing volatilization. It is suitable for safety protection and volatile substance control during pipetting in various places such as laboratories. Specifically, it is a protective funnel device with a valve and a special-shaped pipe for inhibiting the volatilization of toxic gases during pipetting operations in chemical experiments and clinical applications.

[0006] This device aims to reduce turbulence caused by fluid impact by using an elastic sealing strip for adaptive wrapping and irregularly shaped pipes (gourd-shaped or spiral-shaped) to regulate the liquid flow rate, making the liquid transfer process smoother. It provides a novel funnel device with tight sealing, significant anti-evaporation effect, and simple and practical structure. Innovative structural designs include a specially structured channel at the bottom of the funnel, an adsorption box (which can hold different adsorbent materials according to the type of liquid), and an automatic closure similar to a heart valve. This device achieves reliable sealing of liquid bottles of different sizes, effectively inhibits liquid evaporation, and reduces the cost and complexity of use, meeting the liquid transfer needs of various scenarios such as laboratories, chemical production, and clinical applications.

[0007] The technical solution adopted in this utility model is: A pipetting device with a valve for collecting volatile gases includes a funnel with sealing and anti-evaporation functions. The funnel comprises a funnel body, an elastic sealing strip, a funnel lid, a shaped pipe, an adsorption box, and a valve. The elastic sealing strip is installed inside the funnel body on its inner wall. The shaped pipe is connected to the bottom of the funnel body, and a valve is located above the shaped pipe. The valve opens under liquid pressure and automatically closes when there is no liquid pressure. The shaped pipe is gourd-shaped or spiral-shaped, and has a channel on its side connecting to the adsorption box. This allows for the adsorption of harmful volatile gases, preventing them from evaporating into the air and causing harm to humans and the environment.

[0008] Furthermore, the funnel body serves as the basic structure, used to receive and guide the flow of liquid. The elastic sealing strip is designed to expand outwards from the center of the funnel, forming a closed structure. When a liquid bottle is placed in the funnel, the elastic sealing strip uses its elasticity to tightly wrap around the liquid bottle, achieving a tight seal and preventing liquid leakage from the gap between the funnel and the liquid bottle. When there is no liquid bottle, the strip automatically springs back to a sealed state, preventing external impurities from entering and avoiding evaporation of the liquid inside the funnel.

[0009] Furthermore, a funnel lid is provided above the funnel. During the liquid transfer process, the funnel lid can be closed on the top of the funnel to enhance the sealing and prevent residual gas from evaporating through the funnel opening and dust and impurities from entering.

[0010] Furthermore, a valve, designed similarly to a heart valve, is installed at the connection between the funnel and the upper end of the shaped tube. When liquid flows from the funnel into the shaped tube, the valve opens under liquid pressure, allowing unidirectional flow; when the liquid flows in the opposite direction, the valve closes, preventing backflow, thus achieving unidirectional flow control, ensuring the accuracy of the pipetting process, minimizing sealing performance, and preventing the volatilization of harmful gases. Even further, a valve is installed in the middle or lower part of the shaped tube, with the bottom of the tube connected to the liquid receiving bottle, enabling unidirectional transfer of liquid from the shaped tube to the receiving bottle, further ensuring the safety and reliability of the pipetting process.

[0011] Furthermore, the upper half of the irregularly shaped pipe is provided with a channel, which is connected to the adsorption box via a pipe. Depending on the type of liquid transfer, different adsorption materials, such as activated carbon or molecular sieves, can be placed in the adsorption box.

[0012] Furthermore, the irregularly shaped pipe is a gourd-shaped pipe. During liquid transfer, due to density differences, the gas generated by liquid evaporation moves upward within the gourd-shaped pipe. When this gas reaches the flared structure above the gourd-shaped pipe, the flow cross-sectional area increases, thereby reducing the gas velocity. This design provides the gas with more time to enter the adsorption chamber through the channels for effective adsorption treatment. Simultaneously, the constricted section of the gourd-shaped pipe utilizes the "chimney effect," cleverly guiding the gas upward along the pipe axis, reducing the gas's residence time within the pipe, and further improving adsorption efficiency. This allows harmful gases to enter the adsorption chamber through the channels and be effectively adsorbed by the adsorbent material, thus preventing harmful gases from evaporating into the air and protecting the health of laboratory personnel and the experimental environment. When the irregularly shaped pipe is gourd-shaped, a valve is provided in the middle of the gourd-shaped pipe.

[0013] Furthermore, the irregularly shaped pipe is a spiral pipe, with a spiral extension tube connected below the funnel. Its spiral structure increases the liquid flow path, raises flow resistance, reduces flow velocity, and minimizes liquid evaporation during transfer. An adsorption box with replaceable adsorption material is connected above the spiral pipe, allowing volatile harmful gases to enter the adsorption box for collection through channels. This reduces environmental pollution and harm to human health, and lays the foundation for subsequent gas recovery and reuse. When the irregularly shaped pipe is spiral, a valve is provided at the lower part of the spiral pipe.

[0014] Furthermore, the adsorption box is seamlessly connected to the upper space of the irregularly shaped pipeline via a precision stainless steel tube; the adsorption box can also be connected to a gas treatment device to treat harmful volatile gases. Even further, a connection hole is provided on the lower side of the adsorption box for dry connection to a negative pressure suction device, providing a negative pressure operating environment for the adsorption box.

[0015] The innovation of this utility model is reflected in: ① Adaptive elastic sealing structure: An elastic sealing strip is designed inside the funnel, with the center of the funnel as the focal point and spreading outwards, forming a deformable funnel closure structure. This strip can automatically adjust its shape according to the size of different liquid bottle openings to achieve a tight seal; when there is no liquid bottle, it automatically springs back to the closed state. Compared with traditional fixed-shape sealing rings, it solves the problem of poor seal adaptability.

[0016] ② Automatic valve opening and closing device: A one-way automatic closing valve based on the principle of heart valves is installed between the funnel and the irregularly shaped tube. When the liquid flows, the valve opens automatically by the liquid pressure; when the liquid stops flowing, the valve closes automatically to prevent liquid backflow and the entry of outside air; this further enhances the anti-evaporation effect and at the same time prevents liquid leakage to a certain extent, unlike the existing passive sealing structure.

[0017] ③ Multi-layered sealing and anti-evaporation combination: The innovative combination of elastic sealing strips, funnel lids, and automatic closing valves forms an anti-evaporation system covering the entire process from bottle mouth sealing and top sealing to liquid diversion. This combination design enhances the overall sealing and anti-evaporation performance.

[0018] ④ Integrated Hazardous Gas Treatment Structure: The innovatively designed adsorption box seamlessly connects to the upper space of a gourd-shaped or spiral-shaped pipe through precision channels. Utilizing the unique gas guiding mechanism of the gourd or spiral shape, combined with the chimney effect, it achieves natural gas extraction. The flared-out, slow-flow design extends the gas residence time, allowing volatile gases to form an efficient directional flow path within the device. Compared to traditional external adsorption devices, this structure significantly improves the contact efficiency between hazardous gases and the adsorption material, dramatically enhancing the adsorption and purification effect. Furthermore, connecting the adsorption box to a negative pressure suction device provides a negative pressure operating environment for the adsorption box, facilitating gas collection.

[0019] ⑤ Integrated Functional and Form Design: Breakthroughly shaping the pipetting device into a gourd shape, its unique geometric configuration achieves deep integration of core functional modules such as sealing, fluid control, and gas adsorption. The upper flared structure accommodates both sealing and gas collection, the middle constricted design precisely controls the liquid flow rate, and the lower structure perfectly connects to the output port. All functional units form an organic whole based on the gourd shape, ensuring a compact structure while achieving synergistic efficiency, a design concept distinct from traditional straight-cylinder pipetting devices.

[0020] The present invention provides a pipetting device with a valve for collecting volatile gases, which offers the following advantages: (1) Excellent sealing performance: Double protection ensures safe liquid transfer. The double sealing design of the elastic sealing strip and the funnel lid demonstrates good sealing performance, effectively preventing liquid leakage during transfer. At the same time, it also cleverly prevents external impurities from entering and liquid from evaporating, ensuring the purity of the liquid and its safe use. In various experiments and applications, this design makes liquid handling more precise and reliable, greatly improving the stability and efficiency of operation.

[0021] (2) High adaptability: The elastic sealing strip can automatically adjust to seal and wrap the bottle body according to the size of the bottle, which is suitable for bottled liquids of different sizes and can ensure its sealing performance.

[0022] (3) Excellent anti-evaporation effect: Dual mechanism to reduce liquid loss. The adsorption box is designed to further treat volatile gases. The one-way opening and automatic closing function of the valve further blocks air from entering and prevents liquid from evaporating into the air, which is especially suitable for the transfer of harmful volatile liquids. For precious or harmful volatile liquids, it can minimize resource waste and environmental pollution, reduce harm to operators, and ensure the safety and environmental protection of the operation.

[0023] (4) Simple and practical structure with low cost: The overall structure is reasonably designed with clear functions for each component, making it easy to manufacture and use, and also has the advantage of low cost. Therefore, the device is outstanding in practicality and easy to promote and maintain. Its simple design also makes it show significant economic benefits in large-scale production, bringing higher cost performance.

[0024] (5) Reduced harm to the body: This device reduces the volatilization of some toxic gases due to its tight sealing. Some toxic gases volatilize into the air and, if inhaled or come into contact with the skin, may cause symptoms such as headache, dizziness, and respiratory irritation. Long-term exposure can damage the nervous system and liver. This device reduces the harm of toxic liquids to the human body at the source and can also create a healthier and safer working environment for workers.

[0025] (6) Volatile gases can be reused: The adsorption box adopts a modular design, and adsorption materials are configured for different liquid volatilization characteristics. After adsorbing harmful gases, the target gases can be recovered in a targeted manner through heating desorption, solvent elution, etc., or the reversible adsorption characteristics of the adsorption materials can be used to enrich and reuse volatile gases. For example, for solvent vapors with recovery value, a low-temperature condensation device can be linked with the adsorption box to desorb and collect the adsorbed gas, which not only avoids air pollution, but also realizes the recycling of volatile resources, significantly improving the environmental value and economic benefits of the pipetting device.

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the gourd-shaped pipette liquid transfer device according to Embodiment 1 of this utility model; Figure 2 for Figure 1 Top view.

[0028] Figure 3 This is a schematic diagram of the spiral pipe liquid transfer device according to Embodiment 2 of this utility model; In the diagram: 1 is the funnel body, 2 is the elastic sealing strip, 3 is the connecting tube, 4 is the adsorption box, 5 is the valve, 6 is the gourd-shaped pipe, and 7 is the spiral pipe. Detailed Implementation Example 1

[0029] like Figure 1 As shown, a pipetting device with a valve for collecting volatile gases includes a funnel with sealing and anti-evaporation functions. The device comprises a funnel body 1, an elastic sealing strip 2, a funnel lid, a shaped pipe, an adsorption box 4, and a valve 5. The elastic sealing strip 2 is installed inside the funnel body 1, located on the inner wall of the funnel. The shaped pipe is connected to the bottom of the funnel body 1, and the valve 5 is located above the shaped pipe. The valve 5 opens under liquid pressure and automatically closes when there is no liquid pressure. The shaped pipe is gourd-shaped or spiral-shaped, and has a channel on its side connecting to the adsorption box. This allows for the adsorption of harmful volatile gases, preventing them from evaporating into the air and causing harm to humans and the environment.

[0030] In this embodiment, the irregularly shaped pipe is a gourd-shaped pipe 6; the gourd-shaped pipe serves as the main structure of the pipetting device, and its unique gourd-shaped design provides an efficient channel for liquid flow. The upper part of the gourd-shaped pipe is connected to the funnel, and the lower part is connected to the target container (i.e., the liquid receiving bottle), realizing the precise transfer of liquid between different containers.

[0031] The funnel is positioned at the top of the gourd-shaped pipe and is equipped with an elastic sealing strip 2 inside, such as... Figure 2 As shown, the adhesive strip is radially distributed around the center of the funnel and is made of highly elastic and strong-sealing silicone. In use, the funnel is aligned with the mouth of the liquid-containing bottle, and the adhesive strip adapts to different bottle sizes through elastic deformation, forming a tight seal that effectively prevents liquid leakage and impurity intrusion, ensuring the sealing and safety of the liquid transfer process.

[0032] The funnel is fitted with a matching funnel cap. When the pipette is not in use, tightening the funnel cap effectively isolates dust and impurities, while preventing the evaporation of residual liquid inside the device, ensuring the cleanliness of the device and the integrity of the liquid.

[0033] At the junction of the funnel and the gourd-shaped tube, there is a one-way valve with a structure mimicking a heart valve. This valve consists of two medical-grade flexible plastic leaflets, combining flexibility with strong corrosion resistance. When pressure is generated in the liquid inside the funnel, the leaflets automatically open, allowing the liquid to flow smoothly into the gourd-shaped tube; when the liquid stops flowing or the pressure inside the tube exceeds the pressure in the funnel, the leaflets quickly close, preventing backflow and achieving stable one-way liquid transfer.

[0034] The gourd-shaped pipe has a connecting channel at the top, which connects to the adsorption box. The adsorption box is connected to the channel, allowing for flexible replacement of the internal adsorption material according to the characteristics of the liquid being transferred: when transferring volatile organic solvents, activated carbon is filled to adsorb harmful gases using its abundant pores and large specific surface area; when treating acidic volatiles, an alkaline adsorbent is placed for neutralization and adsorption, thereby preventing the diffusion of harmful gases and protecting the health of operators and the safety of the working environment.

[0035] Another valve is located in the middle of the gourd-shaped tube, which can provide a certain degree of sealing for volatile gases generated during pipetting. Its structure and working principle are exactly the same as the upper valve. This valve ensures that the liquid flows smoothly into the target container, while effectively preventing liquid backflow, ensuring the accuracy and smoothness of the pipetting operation.

[0036] The actual operating procedure is as follows: First, open the funnel lid and place the bottle containing the liquid to be transferred into the funnel. The elastic sealing strip will automatically seal the bottle opening. Pour in the liquid. Under the pressure of the liquid, the upper valve opens, and the liquid flows into the gourd-shaped tube. The volatile gas enters the adsorption box through the channels and is adsorbed. After the liquid flows into the tube, the lower valve opens, and the liquid flows precisely into the target container, completing the transfer. After the operation is completed, tighten the funnel lid. If the adsorption material needs to be replaced, the adsorption box can be easily disassembled for replacement.

[0037] The specific usage procedure is as follows: Taking xylene as an example when changing fluids in the pathology department. Before operation, first check the status of the adsorption box. If the activated carbon adsorbent material in the adsorption box has been used, open the top cover of the adsorption box and replace it with specially pretreated activated carbon. The pore size distribution of this activated carbon is carefully designed to match the size of xylene molecules, ensuring excellent adsorption performance for xylene volatile gases. After replacement, ensure the adsorption box is tightly closed to maintain its seal. Next, place the large bottle suitable for the dehydrator below the gourd-shaped pipe, with the bottle opening directly facing the valve outlet below. After the large bottle is securely placed, open the funnel cap and place the original xylene bottle inside the funnel. The elastic sealing strip inside the funnel automatically and tightly wraps around the bottle opening, forming a stable seal and effectively preventing xylene leakage and evaporation during pouring. Then, tilt the original xylene bottle, allowing the xylene to flow into the funnel under gravity. As the xylene level in the funnel gradually rises, the pressure generated by the liquid also gradually increases. When the pressure reaches a certain level, the valve (composed of two medical-grade flexible plastic leaflets) at the connection between the funnel and the gourd-shaped tube will automatically open under the liquid pressure, allowing xylene to flow smoothly into the gourd-shaped tube. During this process, the volatilized xylene gas will enter the adsorption box through the hole at the top of the gourd-shaped tube and be rapidly adsorbed by the activated carbon adsorption material. When the xylene in the gourd-shaped tube accumulates to a certain amount and exerts sufficient pressure on the lower valve, the lower valve will automatically open, allowing the xylene to flow smoothly into the large bottle. By controlling the tilt angle and pouring speed of the original bottle, the transfer rate of xylene can be adjusted until all the xylene in the original bottle is transferred to the large bottle, completing the liquid replacement operation. After the liquid replacement is completed, please immediately tighten the funnel cap and the original xylene bottle cap to seal the funnel and the original bottle. If subsequent xylene transfer operations are required, it is recommended to regularly replace the material in the adsorption box according to the adsorption saturation of the activated carbon to ensure that the device always has excellent xylene volatilization gas adsorption effect, ensuring the health of operators and the safety of the working environment. Example 2

[0038] like Figure 3 As shown, a pipetting device with a valve for collecting volatile gases is illustrated. The irregularly shaped pipe is a spiral pipe 7. The spiral extension tube is connected below the funnel. Its spiral structure increases the liquid flow path, increases flow resistance, reduces flow velocity, and reduces liquid evaporation during the transfer process. An adsorption box with replaceable adsorbent material is connected above the spiral pipe (not shown in the figure, its structure is similar to...). Figure 1 (Similar to the adsorption box), allowing volatile harmful gases to enter the adsorption box through the channels for collection, which reduces environmental pollution and harm to human health, and lays the foundation for the next step of gas recycling and reuse.

[0039] The method of using the spiral pipette is the same as that of the gourd-shaped pipette.

[0040] The adsorption box in this invention is an optional device. If the amount of gas volatilized during the pipetting process is extremely small and negligible, the adsorption box does not need to be connected when using this device. Figure 3 As shown.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pipette with a valve for collecting volatile gases, characterized in that, It includes a funnel body, an elastic sealing strip, a funnel lid, a special-shaped pipe, an adsorption box, and a valve. The elastic sealing strip is installed inside the funnel body and is located on the inner wall of the funnel. The special-shaped pipe is connected to the bottom of the funnel body. A valve is installed above the special-shaped pipe. It opens under liquid pressure and closes automatically when there is no liquid pressure. The special-shaped pipe is gourd-shaped or spiral-shaped. There are channels on the side of the pipe that connect to the adsorption box for adsorbing harmful volatile gases.

2. The pipetting device with a valve for collecting volatile gases according to claim 1, characterized in that, The elastic sealing strip starts from the center of the funnel and spreads outwards to form a closed structure.

3. The pipetting device with a valve for collecting volatile gases according to claim 1, characterized in that, A funnel lid is provided above the funnel. During the transfer process, the funnel lid is placed on top of the funnel to enhance the seal.

4. The pipetting device with a valve for collecting volatile gases according to claim 1, characterized in that, A valve is installed at the connection between the funnel and the upper end of the shaped pipe; another valve is installed in the middle or lower part of the shaped pipe. The bottom of the shaped pipe is connected to the liquid receiving bottle, realizing the one-way transfer of liquid from the shaped pipe to the liquid receiving bottle.

5. The valve-equipped pipetting device for collecting volatile gases according to claim 1, characterized in that, The upper part of the irregularly shaped pipe is provided with a channel, which is connected to the adsorption box through the pipe.

6. The valve-equipped pipetting device for collecting volatile gases according to claim 5, characterized in that, The adsorption box is seamlessly connected to the upper space of the irregularly shaped pipe via a precision stainless steel tube.

7. The valve-equipped pipetting device for collecting volatile gases according to claim 6, characterized in that, The adsorption box is connected to a gas processing device to treat harmful volatile gases.

8. The valve-equipped pipetting device for collecting volatile gases according to claim 7, characterized in that, The lower side of the adsorption box has a pre-reserved connection hole for connecting a negative pressure suction device to provide a negative pressure operating environment for the adsorption box.

9. The valve-equipped pipetting device for collecting volatile gases according to claim 1, characterized in that, The irregularly shaped pipe is a spiral pipe connected below the funnel. Its spiral structure increases the liquid flow path, increases flow resistance, reduces flow velocity, and reduces liquid evaporation during the transfer process.

10. The valve-equipped pipetting device for collecting volatile gases according to claim 1, characterized in that, The irregularly shaped pipe is a gourd-shaped pipe. During the liquid transfer process, the gas generated by the evaporation of the liquid moves upward inside the gourd-shaped pipe.

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