Gas-liquid separation pipe of chemical process pump

Abstract

The invention relates to the technical field of pump bodies, in particular to a gas-liquid separation pipe of a chemical process pump. The device comprises a water inlet pipe, an internal thread, a filter shell, a valve chamber, a separation shell, a spiral flow channel and a cylindrical separation part, the water inlet end of the water inlet pipe is connected with an external water source, the internal thread is arranged on the inner wall of the water inlet pipe, the bottom of the filter shell is communicated with one end of the water inlet pipe, the valve chamber is communicated with the top of the filter shell, the bottom end of the separation shell is communicated with the top of the valve chamber, and the spiral runner is arranged in an inner cavity of the separation shell and surrounds the cylindrical separation piece. The cylindrical separation part is communicated with the contact surface of the spiral flow channel, and the top end of the cylindrical separation part penetrates through the top end of the separation shell and extends out of the separation shell; water flow is forced to form rotating turbulent flow through a lead angle internal thread, micro-bubbles are induced to collide and coalesce into large bubbles larger than 200 microns, and the separability is improved.

Description

Technical Field

[0001] This invention relates to the field of pump technology, and in particular to a gas-liquid separation pipe for a chemical process pump. Background Technology

[0002] Chemical process pumps are highly reliable fluid transport equipment specifically designed for chemical and related process industries (such as petrochemicals, pharmaceuticals, environmental protection, and power generation). Their core function is to safely and continuously transport chemical media with harsh characteristics such as corrosiveness, toxicity, flammability, explosiveness, high temperature and pressure, or containing solid particles, ensuring stable operation of the production process. They utilize corrosion-resistant materials (such as stainless steel, alloys, and ceramics) and special sealing technologies (such as double-end mechanical seals or magnetic drives), meeting stringent standards such as API 610. They are the "heart" of chemical plants, directly impacting production safety and efficiency.

[0003] However, existing equipment often encounters the following problems during use:

[0004] (1) When conveying high-temperature media (>80℃) or easily vaporized liquids (such as propane, tetrahydrofuran), dissolved gas / volatile components precipitate and form bubbles in the low-pressure zone at the inlet of the chemical pump. The bubbles enter the high-pressure zone of the impeller with the liquid (pressure rises 10-50 times) and collapse instantly, generating a 10,000psi high-pressure micro-jet that impacts the impeller surface. The metal surface is torn with honeycomb-like pits (depth can reach 3mm / year).

[0005] (2) When transporting liquefied gases (such as liquid chlorine, propylene) or volatile toxic substances (such as liquid ammonia), after shutdown, the high-pressure gas (1-3 MPa) at the outlet of the chemical pump may backflow into the water inlet system. The gas vaporizes and expands in the pipeline, increasing in volume by 300-500 times. This can cause the gas to breach the mechanical seal, leading to a leak of toxic / flammable media. Propylene and other gases can explode in confined spaces at concentrations of 2%-11%, causing casualties. Summary of the Invention

[0006] The main objective of this invention is to provide a gas-liquid separation pipe for a chemical process pump. This invention solves at least one of the aforementioned problems to a certain extent.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A gas-liquid separation pipe for a chemical process pump, comprising:

[0009] A water inlet pipe, wherein the inlet end of the water inlet pipe is connected to an external water source;

[0010] An internal thread is provided on the inner wall of the water inlet pipe;

[0011] A filter housing, the bottom of which is connected to one end of the water inlet pipe;

[0012] A valve chamber, which is connected to the top of the filter housing;

[0013] A separation shell, the bottom end of which is connected to the top of the valve chamber;

[0014] A spiral flow channel is built into the inner cavity of the separation shell and is arranged around the cylindrical separation member;

[0015] The cylindrical separator is connected to the contact surface of the spiral flow channel, and the top end of the cylindrical separator extends through the top end of the separator shell to the outside of the separator shell.

[0016] Also includes:

[0017] A conical filter element, wherein the conical filter element is longitudinally installed inside the filter housing, and the outer edge of the top end of the conical filter element is fixedly connected to the inner wall of the filter housing;

[0018] A spherical valve core is disposed inside the valve chamber, and the spherical valve core fills the connection between the valve chamber and the valve core;

[0019] The outer edge of the spiral is the edge of the spiral channel away from the outer periphery of the cylindrical separator, and the outer edge of the spiral is an outwardly extending oblique edge;

[0020] A drain pipe, one end of which passes through the separation shell and is connected to the drain outlet at the top of the spiral flow channel.

[0021] Also includes:

[0022] The cylindrical separator coaxially penetrates the center of the spiral flow channel, and the cylindrical separator comprises a three-layer structure from the outside to the inside;

[0023] The cylindrical separator includes:

[0024] The outer membrane is a hydrophobic and porous membrane, and the outer membrane is integrally connected with the inner ring of the spiral flow channel;

[0025] The middle layer of the flow channel is a honeycomb-shaped flow channel, and one end of the middle layer of the flow channel is attached to the inner wall of the outer membrane.

[0026] The inner negative pressure cavity extends through the axial center of the top of the separation shell, and the other end of the middle guide channel converges towards the inner negative pressure cavity.

[0027] Also includes:

[0028] An exhaust port is provided at the top of the cylindrical separator, and the bottom end of the exhaust port is sleeved and connected to the cylindrical separator.

[0029] An exhaust valve is installed on top of the exhaust port and is connected to the exhaust port.

[0030] A vacuum pump, which is connected to the inner negative pressure chamber.

[0031] The upper diameter of the conical filter element is larger than the lower diameter.

[0032] The density of the spherical valve core is less than that of water.

[0033] The internal thread of the water inlet pipe is a continuous spiral groove with a helix angle of 20°.

[0034] The tapered filter element has a taper of 60°, and the surface of the filter element is uniformly covered with micropores with a diameter of 0.1–0.5 mm.

[0035] The airflow direction of the exhaust valve is from the inside of the separation shell to the outside.

[0036] The exhaust valve is a one-way exhaust valve.

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] (1) The internal spiral of the helical helix forces the water flow to form a rotating turbulent flow, inducing microbubbles to collide and coalesce into large bubbles >200μm, thus improving separability. The water flow rotates along the variable pitch channel at a linear velocity of 15-25m / s, generating a centrifugal acceleration of 2000-3000g, which throws the bubbles toward the outer edge of the channel. Finally, the hydrophobic film on the outer side of the deep degassing (cylindrical separator) captures the residual microbubbles (<50μm), which coalesce and rupture at the membrane pores. The dissolved gas is actively drawn in by the negative pressure chamber, reducing the dissolved oxygen concentration to <0.5ppm, which greatly reduces the cavitation damage rate.

[0039] (2) The present invention overcomes the first barrier: a spherical valve core liquid seal lightweight valve core (density 0.8 g / cm³). 3 When the pump stops, it falls freely under gravity, forming a metal-ceramic hard seal with the 60° inverted conical valve seat to prevent leakage. A second barrier is also provided: a one-way exhaust valve, a spring-loaded one-way valve installed on the top of the separator housing, with an opening pressure of 0.01 MPa. It only allows gas to escape; when the pump stops, the spring force automatically locks, blocking the external gas return path and preventing backflow. Attached Figure Description

[0040] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the detailed embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0041] Figure 1 This is a schematic diagram of the overall shape of the invention.

[0042] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0043] Figure 3 This is a sectional view of the cylindrical separator.

[0044] The following are the labels in the diagram: 1. Inlet pipe; 2. Internal thread; 3. Filter housing; 4. Valve chamber; 5. Separator shell; 6. Spiral flow channel; 7. Columnar separator; 8. Conical filter element; 9. Spherical valve core; 10. Spiral outer edge; 11. Drain pipe; 71. Outer membrane; 72. Middle flow channel; 73. Inner negative pressure chamber; 12. Exhaust port; 13. Exhaust valve; 14. Vacuum pump. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0046] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] like Figure 1-3 As shown, the present invention provides a gas-liquid separation pipe for a chemical process pump. The gas-liquid separation pipe of the chemical process pump includes an inlet pipe 1, an internal thread 2, a filter shell 3, a valve chamber 4, a separation shell 5, a spiral flow channel 6, and a cylindrical separation element 7.

[0048] The inlet end of the inlet pipe 1 is connected to an external water source, and the internal thread 2 is set on the inner wall of the inlet pipe 1. The internal thread 2 can disrupt the laminar flow state of the water, enhance the coalescence of gas nuclei, and improve the efficiency of subsequent separation. Chemical process pumps often transport liquids containing dissolved gases / volatile substances, such as high-temperature solvents and easily vaporized media. Pre-coalescing of bubbles can prevent microbubbles from clogging the subsequent separation structure. The bottom of the filter shell 3 is connected to one end of the inlet pipe 1, the valve chamber 4 is connected to the top of the filter shell 3, and the bottom end of the separation shell 5 is connected to the top of the valve chamber 4. The spiral flow channel 6 is built into the inner cavity of the separation shell 5. The spiral flow channel 6 is arranged around the cylindrical separation element 7. The water flow is subjected to the Coriolis force, and the bubbles are pushed to the outer edge of the flow channel. The principle is similar to that of a cyclone separator. The cross-section of the channel gradually narrows, the flow velocity increases but the streamline is stable, reducing secondary mixing of bubbles and guiding the bubbles to migrate to the outside of the flow channel. The pitch decreases from top to bottom. The large pitch at the bottom reduces the flow resistance, and the small pitch at the top enhances the centrifugal force and throws the bubbles to the outer edge.

[0049] In this invention, the contact surface between the cylindrical separator 7 and the spiral flow channel 6 is connected, and the top end of the cylindrical separator 7 extends through the top end of the separator shell 5 and outwards. A conical filter element 8 is longitudinally embedded inside the filter shell 3, with its outer edge fixedly connected to the inner wall of the filter shell 3. The upper diameter of the conical filter element 8 is larger than its lower diameter, and its taper is 60°. The surface of the filter element has evenly distributed micropores with a diameter of 0.1–0.5 mm. The inverted conical structure prevents impurities from accumulating and clogging, and cleaning is achieved through backwashing. Chemical media often contain hard impurities such as catalyst particles and polymer precipitates, as well as slurry pumps in the petrochemical industry. This design protects the spiral flow channel 6 and the cylindrical separator 7 from wear.

[0050] In this invention, a spherical valve core 9 is disposed inside the valve chamber 4, filling the connection between the valve chamber 4 and the valve core. The density of the spherical valve core 9 is less than that of water. It automatically opens and closes using buoyancy and gravity, ensuring that the filter housing 3 cavity is always filled with water, forming a liquid seal to isolate air. The lightweight ball valve with a density less than water achieves dual-state automatic control: it floats upwards to ensure continuous flow when water is flowing, and falls downwards to seal when the pump stops, forming a liquid seal to prevent gas backflow. The outer spiral edge 10 is the edge of the spiral flow channel 6 away from the outer periphery of the cylindrical separator 7. The outer spiral edge 10 is an outwardly extending oblique edge. One end of the drain pipe 11 passes through the separator 5, and the drain pipe 11 is connected to the drain outlet at the top of the spiral flow channel 6. The internal thread 2 of the inlet pipe 1 is a continuous spiral groove with a spiral helix angle of 20°.

[0051] In this invention, the cylindrical separator 7 coaxially penetrates the center of the spiral flow channel 6, and the cylindrical separator 7 comprises a three-layer structure from the outside to the inside. The cylindrical separator 7 includes an outer membrane 71, which is a hydrophobic and porous membrane, integrally connected to the inner ring of the spiral flow channel 6. The special structure on the surface of the column directly captures and adsorbs microbubbles. This special structure on the surface of the cylindrical separator 7 enhances the aggregation and collapse efficiency of bubbles. Through micron-level surface textures or uneven designs, bubbles can adhere more easily and collapse rapidly, reducing their residence time in the liquid. The middle guide channel 72 is a honeycomb-shaped guide channel, with one end of the middle guide channel 72 adhering to the inner wall of the outer membrane 71. The honeycomb guide channel design helps optimize the flow path of the airflow and liquid flow, reducing flow resistance, allowing the liquid to flow smoothly when passing through the cylindrical separator 7, while the gas can rise more easily and separate from the liquid.

[0052] In this invention, the inner negative pressure chamber 73 penetrates the axial center of the top of the separation shell 5, and the other end of the middle guide channel 72 converges towards the inner negative pressure chamber 73. The flow channel inside the cylindrical separator 7 is typically designed with a gradually narrowing structure, which enhances the centrifugal force that propels bubbles outward. When the liquid flows, the bubbles are pushed to the outside of the flow channel, further reducing their residence time in the liquid and promoting their separation. The exhaust port 12 is located at the top of the cylindrical separator 7, and the bottom end of the exhaust port 12 is sleeved and connected to the cylindrical separator 7. The exhaust valve 13 is installed at the top of the exhaust port 12 and is connected to the exhaust port 12. The airflow direction of the exhaust valve 13 is from the inside of the separation shell 5 to the outside. The exhaust valve 13 is a one-way exhaust valve. The vacuum pump 14 is connected to the inner negative pressure chamber 73.

[0053] It should be noted that, in the gas-liquid separation pipe of the chemical process pump designed in this invention, during the water inlet stage, water flows through the inlet pipe 1 with internal threads 2. The threads guide the water flow to form a spiral turbulent flow, initially breaking up air bubbles in the water. The water flows into the filter housing 3, where it passes through the conical filter element 8, which is wider at the top and narrower at the bottom, to intercept fine solid impurities. The filtered water rises to the valve chamber 4, pushing the lightweight spherical valve core 9 to float and open the channel; when there is no water, the valve core falls freely to seal the outlet, preventing gas backflow. The water flows from the valve chamber 4 into the spiral flow channel 6 at the bottom of the separation shell 5, and rises at high speed along the flow channel. Water flows around the central cylindrical separator 7, where dissolved oxygen / bubbles are continuously adsorbed and extracted from its surface. The extraction process involves an outer hydrophobic and porous membrane (e.g., PTFE coating) that selectively allows air to pass through while blocking water, causing tiny bubbles to coalesce and burst at the pore openings. A honeycomb-shaped flow channel in the middle layer guides the gas towards the top of the cylindrical separator 7's inner cavity. The honeycomb pores reduce flow resistance. An internal negative pressure chamber actively draws in dissolved oxygen through micropores, accelerating gas precipitation, which is finally discharged through the top exhaust port 12. The centrifugal force generated by rotation throws the lighter bubbles outwards from the flow channel. The degassed water enters the chemical pump inlet from the top outlet of the spiral flow channel 6. The separated gas is discharged through the internal channels of the cylindrical separator or the exhaust port at the top of the separator shell 5.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gas-liquid separation pipe for a chemical process pump, characterized in that, include: Water inlet pipe (1), the water inlet end of which is connected to an external water source; Internal thread (2), the internal thread (2) is provided on the inner wall of the water inlet pipe (1); Filter housing (3), the bottom of which is connected to one end of the water inlet pipe (1); Valve chamber (4), which is connected to the top of the filter housing (3); Separation shell (5), the bottom end of which is connected to the top of the valve chamber (4); Spiral flow channel (6), the spiral flow channel (6) is built into the inner cavity of the separation shell (5), and the spiral flow channel (6) is arranged around the cylindrical separation member (7); The cylindrical separator (7) is connected to the contact surface of the spiral flow channel (6), and the top end of the cylindrical separator (7) extends through the top end of the separator shell (5) to the outside of the separator shell (5).

2. The gas-liquid separation pipe of a chemical process pump according to claim 1, characterized in that, Also includes: A conical filter element (8) is longitudinally built into the filter housing (3), and the outer edge of the top end of the conical filter element (8) is fixedly connected to the inner wall of the filter housing (3). A spherical valve core (9) is disposed inside the valve chamber (4) and fills the connection between the valve chamber (4) and the valve core. Spiral outer edge (10), the spiral outer edge (10) is the edge of the spiral flow channel (6) away from the outer periphery of the cylindrical separator (7), the spiral outer edge (10) is an outwardly extending oblique edge; A drain pipe (11) is provided at one end through the separation shell (5), and the drain pipe (11) is connected to the top drain outlet of the spiral flow channel (6).

3. The gas-liquid separation pipe of a chemical process pump according to claim 1, characterized in that, Also includes: The cylindrical separator (7) coaxially penetrates the center of the spiral flow channel (6), and the cylindrical separator (7) comprises a three-layer structure from the outside to the inside; The cylindrical separator (7) includes: The outer membrane (71) is a hydrophobic and porous membrane, and the outer membrane (71) is integrally connected with the inner ring of the spiral channel (6); The middle layer guide channel (72) is a honeycomb guide channel, and one end of the middle layer guide channel (72) is attached to the inner wall of the outer membrane (71); The inner negative pressure cavity (73) extends through the axial center of the top of the separation shell (5), and the other end of the middle guide channel (72) converges towards the inner negative pressure cavity (73).

4. The gas-liquid separation pipe of a chemical process pump according to claim 3, characterized in that, Also includes: An exhaust port (12) is provided at the top of the cylindrical separator (7), and the bottom end of the exhaust port (12) is sleeved and connected to the cylindrical separator (7). An exhaust valve (13) is installed on the top of the exhaust port (12) and is connected to the exhaust port (12); A vacuum pump (14) is connected to the inner negative pressure chamber (73).

5. The gas-liquid separation pipe of a chemical process pump according to claim 2, characterized in that, The upper diameter of the conical filter element (8) is larger than the lower diameter.

6. The gas-liquid separation pipe of a chemical process pump according to claim 2, characterized in that, The density of the spherical valve core (9) is less than that of water.

7. The gas-liquid separation pipe of a chemical process pump according to claim 2, characterized in that, The internal thread (2) of the water inlet pipe (1) is a continuous spiral groove with a helix angle of 20°.

8. The gas-liquid separation pipe of a chemical process pump according to claim 2, characterized in that, The tapered filter element (8) has a taper of 60° and the surface of the filter element is uniformly covered with micropores with a diameter of 0.1–0.5 mm.

9. The gas-liquid separation pipe of a chemical process pump according to claim 4, characterized in that, The airflow direction of the exhaust valve (13) is from the inside of the separation shell (5) to the outside.

10. The gas-liquid separation pipe of a chemical process pump according to claim 4, characterized in that, The exhaust valve (13) is a one-way exhaust valve (13).

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