A gas-liquid extraction structure and an HDPE ultra-clean tank containing the structure

Abstract

This invention discloses a gas-liquid extraction structure and an HDPE cleanroom containing the structure. The structure includes a cleanroom with a discharge port at the top and a liquid phase cover threadedly connected to the discharge port. The liquid phase cover is equipped with a detachable extraction element, which internally contains independent but collaborative liquid extraction channels and gas compensation channels. The bottom of the liquid phase cover is connected to an extraction pipe connector via a connecting boss, and the bottom of this connector is connected to the extraction pipe. This invention belongs to the field of liquid extraction technology, and its technical effects are as follows: by constructing an independent mechanical pressure balance path, adaptive adjustment of the pressure inside and outside the tank is achieved during the extraction operation; when the extraction operation causes negative pressure inside the tank, external air automatically compensates along a predetermined path under atmospheric pressure, eliminating the risk of tank deformation caused by negative pressure and ensuring continuous and stable operation of the extraction operation.

Description

Technical Field

[0001] This invention relates to the field of liquid extraction technology, specifically to a gas-liquid extraction structure and an HDPE cleanroom containing the structure. Background Technology

[0002] In the fields of high-purity liquid handling, such as chemical engineering, biopharmaceuticals, and electronic semiconductors, ultra-clean HDPE tanks serve as critical material storage and transfer containers. The integrity and safety of their liquid extraction operations directly impact the quality of production processes. Currently, the industry commonly uses a method of inserting a extraction pipe through the top opening of the tank in conjunction with an external pump for liquid transfer. However, during continuous extraction, the failure to promptly compensate for the liquid output volume creates a progressively negative pressure environment within the sealed tank. This continuous accumulation of negative pressure not only significantly increases the workload of the extraction pump, leading to flow fluctuations and metering errors, but more seriously, can cause structural damage to the tank. Collapse can cause permanent damage to containers and even material contamination. While there are simple solutions in the existing technology that maintain pressure balance by adding vents, such normally open structures cannot effectively prevent the intrusion of external pollutants when not in operation, nor can they control the release of volatile components inside the container, thus failing to meet the stringent requirements of clean environments for material integrity. On the other hand, some solutions that use pressure valves for control have technical bottlenecks such as complex structures, slow response, and insufficient sensitivity under low flow conditions. Especially in applications that handle high-viscosity liquids or require precise fluid control, traditional pressure balancing devices often struggle to achieve rapid and accurate pressure regulation.

[0003] Therefore, to address the shortcomings of existing requirements, we propose a gas-liquid extraction structure and an HDPE ultra-clean tank containing this structure. Summary of the Invention

[0004] Therefore, the present invention provides a gas-liquid extraction structure to solve the above-mentioned problems in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] According to a first aspect of the present invention, a gas-liquid extraction structure includes an ultra-clean tank with a discharge port at the top and a liquid phase tank cover threadedly connected to the discharge port. The liquid phase tank cover is equipped with a detachable extraction element, which internally provides a liquid extraction channel and a gas compensation channel that work independently but collaboratively. The bottom of the liquid phase tank cover is connected to an extraction pipe connector via a connecting boss, and the bottom of the connector is connected to the extraction pipe. A slot is formed at the bottom of the inner wall of the liquid phase tank cover, and a liquid phase tank plug is interference-fitted into the slot. The extraction element includes an extraction housing with an insertion block at the bottom, and the insertion block and the slot are connected... The outer wall of the suction housing is threadedly connected to the inner wall of the liquid phase tank cover via a sliding fit. The gas compensation channel includes an air inlet channel on the side of the suction housing, which is connected to the interface one at the bottom of the slot through an annular through groove and an arc groove. The suction pipe connector has an annular cavity inside, with the interface two at its top mating with the interface one. An exhaust port is opened on the side of the annular cavity. The bottom of the liquid phase tank cover has an annular protective cover that surrounds the exhaust port in its internal space. This forms a complete air intake path from the air inlet to the top of the tank. The gas compensation channel has a control mechanism that automatically opens during the suction operation.

[0007] Furthermore, a one-way barrier device is provided at the inlet of the gas compensation channel. This device remains normally closed when not in operation and opens in response to negative pressure when in operation.

[0008] Furthermore, the one-way blocking device includes an air intake chamber, a conical thrust spring, and a spherical sealing block, wherein the conical thrust spring provides a constant pre-tight sealing force, and the spherical sealing block has self-centering characteristics.

[0009] Furthermore, the air intake chamber has a special contour structure, with a cylindrical guide section in the middle and conical transition sections at both ends.

[0010] Furthermore, the output end of the air intake chamber is connected to the input end of the air intake channel, the conical thrust spring is installed inside the air intake chamber, and the top end of the conical thrust spring is connected to the spherical sealing block.

[0011] Furthermore, the intake channel is narrow in the middle and gradually widens at both ends; it includes a throat, the top of which is connected to a diffuser section and the bottom of which is connected to a compression section; a series channel is provided on one side of the throat, and the other end of the series channel is connected to an intake channel.

[0012] Furthermore, the inner wall of the series channel is provided with a flexible diaphragm, and a connecting rod is connected to the center of the outer side of the diaphragm. The other end of the connecting rod is connected to a spherical sealing block, which can convert the negative pressure of the fluid generated in the extraction channel into mechanical pulling force.

[0013] Furthermore, the arc-shaped grooves are evenly distributed along the circumference of the inner wall of the intake housing, forming a multi-channel air intake structure.

[0014] Furthermore, the annular cavity is configured as an annular sealed cavity, with exhaust ports evenly distributed circumferentially on its outer side.

[0015] Furthermore, the annular protective cover is fixedly connected to the bottom of the liquid phase tank cover, and its diameter is larger than the diameter of the exhaust port distribution circle.

[0016] Furthermore, the annular protective cover is fixedly connected to the bottom of the liquid phase tank cover, and its diameter is larger than the diameter of the exhaust port distribution circle.

[0017] The present invention has the following advantages:

[0018] 1. This gas-liquid extraction structure achieves adaptive adjustment of the pressure inside and outside the tank during the extraction process by constructing an independent mechanical pressure balance path. When the extraction operation causes negative pressure inside the tank, the external air automatically compensates along a predetermined path under atmospheric pressure. This purely physical mechanism does not rely on an external power source and can effectively maintain pressure balance, completely eliminating the risk of tank deformation caused by negative pressure and ensuring continuous and stable operation of the extraction operation. The entire pressure balance process does not require manual intervention, greatly improving the convenience of operation and the reliability of the system.

[0019] 2. This gas-liquid extraction structure, through a one-way air intake structure, relies on spring preload to achieve a complete seal of the air inlet in the non-working state, forming a reliable physical isolation barrier; this normally closed design effectively prevents particulate pollutants and microorganisms in the outside air from entering the container, and avoids gas exchange between the stored materials in the container and the external environment, making it particularly suitable for ultra-clean environments with strict cleanliness requirements; at the same time, this structure can automatically open when the negative pressure reaches the threshold, perfectly balancing the dual requirements of sealing and functionality;

[0020] 3. This gas-liquid extraction structure, with its diffuser section, throat, compression section, and diaphragm linkage transmission mechanism, converts fluid kinetic energy into mechanical power, forming a combined active and passive drive mode. When the local negative pressure generated by the liquid flowing through the throat is amplified by the diaphragm assembly, it provides additional auxiliary power for valve opening. This dual-action mechanism significantly improves the system's response sensitivity. Especially under conditions of low-flow extraction or high-viscosity liquid transmission, this design ensures that the pressure compensation system starts in a timely manner, effectively solving the hysteresis problem of traditional single negative pressure drive mode, enabling the system to maintain excellent performance under various operating conditions. Attached Figure Description

[0021] Figure 1 This is a front view of an ultra-clean tank with a gas-liquid extraction structure proposed in this invention;

[0022] Figure 2 To capture the main view of the component;

[0023] Figure 3 for Figure 2 Exploded top view;

[0024] Figure 4 for Figure 3 A bottom view;

[0025] Figure 5 for Figure 3 A cross-sectional view;

[0026] Figure 6 for Figure 5 A schematic diagram of the decomposition process;

[0027] Figure 7 This is a cross-sectional view of the extraction channel.

[0028] In the diagram: 1. Clean tank; 2. Discharge port; 3. Liquid phase tank cover; 31. Slot; 32. Liquid phase tank plug; 33. Connecting boss two; 311. Interface one; 312. Protective cover; 4. Suction pipe; 41. Suction pipe connector; 5. Suction element; 501. Suction housing; 502. Insert block; 503. Suction channel; 504. Liquid phase interface; 411. Annular cavity; 412. Exhaust port; 413. Interface two; 514. Arc groove; 515. Annular through groove; 516. Air inlet channel; 517. Air inlet chamber; 518. Conical thrust spring; 519. Spherical sealing block; 520. Air inlet; 601. Series channel; 602. Diaphragm; 603. Connecting rod; 701. Diffusion section; 702. Throat; 703. Compression section. Detailed Implementation

[0029] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1:

[0031] Reference Figure 1 - Figure 7 A gas-liquid extraction structure includes an ultra-clean tank 1, with a discharge port 2 at the top of the ultra-clean tank 1. A liquid phase tank cover 3 is threadedly connected to the inner wall of the discharge port 2. A connecting boss 33 is installed at the bottom of the liquid phase tank cover 3. A suction pipe connector 41 is threadedly connected to the bottom of the connecting boss 33. A suction pipe 4 is connected to the bottom input end of the suction pipe connector 41. A slot 31 is provided at the bottom of the inner wall of the liquid phase tank cover 3. A liquid phase tank plug 32 is installed in the inner wall of the slot 31 with an interference fit.

[0032] Furthermore, a suction element 5 can be installed on the liquid phase tank cover 3. The suction element 5 includes a suction housing 501. A plug 502 is fixedly connected to the bottom of the suction housing 501. The plug 502 is slidably connected to the outer wall of the slot 31. The lower part of the outer wall of the suction housing 501 is threadedly connected to the inner wall of the liquid phase tank cover 3. The suction housing 501 is provided with a suction channel 503.

[0033] When in use, remove the liquid phase tank plug 32 in the slot 31, and then install the suction element 5 into place, that is, connect the suction housing 501 of the suction element 5 to the inner wall of the liquid phase tank cover 3 by thread, and ensure that the plug 502 is inserted into the slot 31 to achieve sealing and positioning. Finally, connect the liquid phase interface 504 at the top of the suction housing 501, which communicates with the suction channel 503, to the input end of the suction pump through a pipe.

[0034] The main problem with the above-mentioned basic solution is that when liquid is continuously drawn from the clean tank 1, a negative pressure will form inside it. This will not only increase the load on the suction pump and affect the stability and efficiency of liquid transfer, but may even cause the clean tank 1 to shrivel or deform in severe cases. To solve this problem, this embodiment introduces the mechanical pressure balancing structure described below:

[0035] Specifically, an air intake channel 516 is provided on one side of the suction housing 501. The input end of the air intake channel 516 is connected to an air intake chamber 517. An air intake port 520 is provided on the top of the air intake chamber 517. At the same time, a plurality of arc-shaped grooves 514 arranged in a ring array are provided on the lower inner wall of the suction housing 501. The top of the arc-shaped grooves 514 is connected to an annular through groove 515. The top of the annular through groove 515 is connected to the bottom of the air intake channel 516.

[0036] The inner wall of the slot 31 has a first interface 311 on its outer bottom, the top of which corresponds to the arc-shaped groove 514; the inner wall of the suction tube connector 41 has an annular cavity 411 on its upper side, the top of which has a second interface 413, and the outer side of which has an annular array of exhaust ports 412; thus, a complete air intake path is formed: external air passes through the air intake port 520 → air intake chamber 517 → air intake channel 516 → annular through groove 515 → arc-shaped groove 514 → first interface 311 → second interface 413 → annular cavity 411, and finally enters the top gas phase space inside the ultra-clean tank 1 through the exhaust port 412; the bottom of the liquid phase tank cover 3 is fitted with an annular protective cover 312, the bottom of the discharge port 2 is at the same level as the top of the inner wall of the ultra-clean tank 1, and both the liquid phase tank cover 3 and the protective cover 312 are located inside the discharge port 2, from which... Figure 5As can be seen, the exhaust port 412 of the air intake path is located inside the protective cover 312. This design ensures that under normal use, the exhaust port 412 is always located above the liquid inside the ultra-clean tank 1, so that the compensating air can directly enter the gas phase space and avoid contact with the liquid to generate bubbles.

[0037] Working principle: When the suction pump is working, the liquid in the ultra-clean tank 1 is extracted, the internal liquid level drops, resulting in a decrease in air pressure in the top space (forming a negative pressure); at this time, the atmospheric pressure of the external environment and the negative pressure inside the tank form a pressure difference. This pressure difference drives the external air to overcome the flow resistance in the path and automatically replenish the tank through the above-mentioned air intake path, so that the pressure quickly returns to balance; this process is completely passive and requires no external intervention, effectively preventing the tank from collapsing and ensuring the smoothness and safety of the suction operation.

[0038] Example 2:

[0039] Similar to Example 1, but with a constantly open air intake path, posing a potential risk: When not in use for extended periods, external dust and other contaminants may enter through this path, contaminating the clean environment inside the container; simultaneously, volatile substances inside the container may slowly escape through this path. To further address this issue, a further approach is to refer to... Figure 4 A gas-liquid extraction structure is provided in an air intake chamber 517 with a one-way air intake structure. The structure includes a conical thrust spring 518, the bottom of which is fixedly connected to the inner wall of the air intake chamber 517, and a spherical sealing block 519 is fixedly connected to the top of which is corresponding to the air inlet 520, forming a normally closed one-way valve.

[0040] Furthermore, the middle part of the air intake chamber 517 is cylindrical, and both ends are tapered with a diameter decreasing from the inside to the outside; this structure facilitates the smooth passage of airflow and guides and limits the movement of the spherical sealing block 519.

[0041] Working principle: In the non-working state, the preload of the conical thrust spring 518 forces the spherical sealing block 519 to press tightly against the air inlet 520, forming a reliable seal and completely isolating the internal and external environments of the tank, thus playing a dual role of dust prevention and pressure maintenance. When the suction pump starts and a sufficiently large negative pressure is generated inside the tank, the force of the external atmospheric pressure acting on the spherical sealing block 519 will overcome the preload of the conical thrust spring 518, pushing the block away from the air inlet 520, opening the one-way valve, and allowing air to enter to balance the pressure. Once suction stops and the negative pressure inside the tank disappears, the spring force immediately resets the block, resealing the air inlet. This design achieves automatic control of "automatic opening under negative pressure and automatic closing under balance".

[0042] Example 3:

[0043] Similar to Example 1, but its one-way valve opening relies entirely on the overall negative pressure inside the tank, which may result in insufficient response or insufficient opening force when drawing small flow rates. To address this issue, a further approach is taken: combining fluid dynamics principles with mechanical structures to provide an active auxiliary driving force for the opening of the one-way valve, referring to... Figure 7 A gas-liquid extraction structure is provided, wherein the extraction channel 503 is narrow in the middle and gradually widens at both ends; specifically, it includes a throat 702, the top end of which is connected to a diffuser section 701 and the bottom end of which is connected to a compression section 703; a series channel 601 is provided on one side of the throat 702, the other end of which is connected to an air inlet channel 516; a flexible diaphragm 602 is provided on the inner wall of the series channel 601; a connecting rod 603 is connected to the center of the outer side of the diaphragm 602; and the other end of the connecting rod 603 is connected to a spherical sealing block 519.

[0044] Working principle: When the liquid flows through the throat 702 of the venturi tube, the flow velocity increases and the static pressure drops to a minimum, thereby creating a significant local negative pressure zone in the throat; this local negative pressure acts on the diaphragm 602 through the series channel 601, generating an inward adsorption force; this force is transmitted to the spherical sealing block 519 through the connecting rod 603, and is converted into a directional force to assist its opening;

[0045] Therefore, in actual operation, the spherical sealing block 519 is simultaneously subjected to two opening forces: one is the atmospheric pressure generated by the overall negative pressure inside the barrel, and the other is the active adsorption force generated by the Venturi effect. This "active and passive combination" driving mechanism makes the opening of the one-way valve more sensitive, rapid and reliable, and can ensure timely pressure compensation even when the intake flow is small, which greatly improves the system's response performance and working efficiency.

Claims

1. A gas-liquid draw structure, comprising: The application relates to a liquid-phase bucket cover which is screwed to a top discharge opening of an ultra-clean bucket and is provided with a detachable liquid-siphoning element, wherein a liquid-siphoning channel and a gas compensation channel which are independent of each other but work cooperatively are arranged in the liquid-siphoning element; a connecting lug is arranged at the bottom of the liquid-phase bucket cover to connect a siphoning pipe connector, and the bottom of the siphoning pipe connector is connected to a siphoning pipe; a slot is arranged at the bottom of the inner wall of the liquid-phase bucket cover, and a liquid-phase bucket plug is in interference fit in the slot; the siphoning element comprises a siphoning shell provided with an insertion block at the bottom, the insertion block is in sliding fit with the slot, and the outer wall of the siphoning shell is screwed to the inner wall of the liquid-phase bucket cover; the gas compensation channel comprises an air inlet channel arranged at the side of the siphoning shell, the channel is communicated with a butt joint interface one at the bottom of the slot through an annular through groove and an arc-shaped groove; an annular cavity is arranged in the siphoning pipe connector, a butt joint interface two at the top of the annular cavity is butted to the butt joint interface one, and an air outlet is arranged at the side of the annular cavity; an annular shield is arranged at the bottom of the liquid-phase bucket cover to surround the air outlet in the inner space of the annular shield; thus, a complete air inlet path from the air inlet to the top of the bucket is formed, and the gas compensation channel has a control mechanism which is automatically opened during siphoning operation; A one-way blocking device is arranged at the inlet of the gas compensation channel, the device is kept closed and sealed in a non-working state and is opened in a working state in response to negative pressure; the one-way blocking device comprises an air inlet bin, a conical thrust spring and a spherical sealing block, the conical thrust spring provides a constant pre-tightening sealing force, and the spherical sealing block has a self-centering property; The air inlet bin has a special profile structure, the middle part is a cylindrical guide section, and the two ends are conical transition sections; The output end of the air inlet bin is connected to the input end of the air inlet channel, the conical thrust spring is arranged in the air inlet bin, and the top end of the conical thrust spring is connected to the spherical sealing block; The siphoning channel is arranged to be narrow in the middle part and gradually wide at the two ends; The throat is connected to a diffusion section at the top end and a compression section at the bottom end, a series connection channel is arranged at one side of the throat, the other end of the series connection channel is communicated with the air inlet channel, a flexible diaphragm is arranged on the inner wall of the series connection channel, a connecting rod is connected to the outside center of the diaphragm, and the other end of the connecting rod is connected to the spherical sealing block, so that fluid negative pressure generated in the siphoning channel can be converted into mechanical tension.

2. The gas-liquid drawing structure according to claim 1, wherein The arc-shaped grooves are uniformly distributed along the inner wall of the siphoning shell to form a multi-channel air inlet structure.

3. The gas-liquid entrapping structure according to claim 2, wherein The annular cavity is arranged as an annular closed cavity, and the air outlets on the outside of the annular cavity are uniformly distributed in the circumferential direction.

4. The gas-liquid entrapping structure according to claim 3, wherein The annular shield is fixedly connected to the bottom of the liquid-phase bucket cover, and the diameter of the annular shield is greater than that of a circle on which the air outlets are distributed.

5. An HDPE super-clean keg characterized in that, The application further relates to a gas-liquid siphoning structure.

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