A fluoroplastic chemical centrifugal pump inlet anti-crystallization structure

Abstract

This utility model discloses an anti-crystallization structure at the inlet of a fluoroplastic chemical centrifugal pump, specifically relating to the field of centrifugal pumps. It includes a pump body and a pump cover. An inlet pipe is fixedly installed at the front end of the pump cover. The inner wall of the inlet pipe is integrally formed with spiral guiding ribs, the spiral direction of which is the same as the impeller's rotation direction. This anti-crystallization structure at the inlet of the fluoroplastic chemical centrifugal pump utilizes multiple spiral guiding ribs on the inner wall of the inlet pipe to force the fluid to swirl before entering the impeller. The high-velocity swirling flow continuously washes the pipe wall, disrupting crystal nucleus adhesion and growth. The graphene-filled PTFE layer covering the inner wall of the inlet pipe eliminates "crystallization hotspots" caused by localized overcooling, enhancing thermal uniformity. Simultaneously, in conjunction with a sleeve-type heating coil and a high-thermal-conductivity insulating ceramic layer, heat is evenly transferred to the inlet pipe flow channel, preventing low-temperature crystallization.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump technology, and in particular to an anti-crystallization structure at the inlet of a fluoroplastic chemical centrifugal pump. Background Technology

[0002] Fluoroplastic chemical centrifugal pumps are widely used for transporting corrosive media such as acids, alkalis, and salts due to their excellent corrosion resistance. However, when transporting saturated solutions (such as sodium chloride and ammonium sulfate), crystals easily precipitate at the pump inlet due to pressure reduction, flow rate changes, or temperature fluctuations, leading to the following problems: blockage of the inlet pipe and impeller, requiring frequent shutdowns for cleaning; wear of the sealing surface by crystals, shortening the life of the mechanical seal; and decreased pump efficiency and increased energy consumption. Existing anti-crystallization solutions are mostly external intervention methods (such as steam tracing and flushing water injection), which have problems such as high energy consumption, media dilution, and system complexity. There is an urgent need for an anti-crystallization structure at the inlet of fluoroplastic chemical centrifugal pumps. Utility Model Content

[0003] The main purpose of this invention is to provide an anti-crystallization structure for the inlet of a fluoroplastic chemical centrifugal pump, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A fluoroplastic chemical centrifugal pump inlet anti-crystallization structure includes a pump body and a pump cover. An inlet pipe is fixedly installed at the front end of the pump cover. The inner wall of the inlet pipe is integrally formed with a spiral guide rib. The spiral guide rib rotates in the same direction as the impeller, and the guide angle of the spiral guide rib is 15°-35°. The height of the spiral guide rib is 5%-8% of the diameter of the inlet pipe. The starting end of the spiral guide rib extends to the end face of the inlet flange, and the terminating end extends to the edge of the impeller suction port. The inlet pipe has a tapered contraction structure, and the inner wall of the inlet pipe is covered with a nano-scale graphene-filled PTFE layer.

[0006] Preferably, the cross-section of the spiral guide rib is a streamlined semi-ellipse.

[0007] Preferably, there are 2 to 3 spiral guide ribs distributed circumferentially.

[0008] Preferably, an electric heating coil is coaxially nested outside the inlet pipe.

[0009] Preferably, the heating coil is fitted with an isolation sleeve.

[0010] Preferably, a highly thermally conductive insulating ceramic layer is filled between the heating coil and the outer wall of the inlet pipe.

[0011] Preferably, a temperature sensor is embedded in the inner wall of the inlet pipe.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This utility model discloses an anti-crystallization structure at the inlet of a fluoroplastic chemical centrifugal pump. By setting multiple spiral guide ribs on the inner wall of the inlet pipe, the spiral ribs force the fluid to generate a forced swirling flow before entering the impeller. The high-velocity swirling flow continuously washes the pipe wall, destroying the adhesion and growth of crystal nuclei. The graphene-filled PTFE layer covering the inner wall of the inlet pipe can eliminate "crystallization hot spots" caused by local supercooling and enhance the uniformity of heat conduction. At the same time, in conjunction with the set sleeve-type electric heating coil and the high thermal conductivity insulating ceramic layer, heat is evenly transferred to the inlet pipe flow channel to avoid low-temperature crystallization. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a first cross-sectional view of the present invention;

[0016] Figure 3 This is a second cross-sectional view of the present invention.

[0017] In the diagram: 1. Pump body; 2. Inlet pipe; 3. Spiral guide rib; 4. Isolation sleeve; 5. Heating coil; 6. High thermal conductivity insulating ceramic layer; 7. Temperature sensor; 11. Pump cover. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0019] like Figure 1-3 As shown, an anti-crystallization structure for the inlet of a fluoroplastic chemical centrifugal pump includes a pump body 1 and a pump cover 11. An inlet pipe 2 is fixedly installed at the front end of the pump cover 11. A spiral guide rib 3 is integrally formed on the inner wall of the inlet pipe 2. The guide rib and the pump cover 11 are molded in one piece without any connection gaps, eliminating crystal stagnation points. Simultaneously, the spiral guide rib 3 forces the fluid to generate a forced swirling flow before entering the impeller. The high-velocity swirling flow washes over the wall of the inlet pipe 2, preventing crystal nuclei from attaching and growing, and eliminating stagnant areas in the inlet pipe 2. The spiral direction of the guide rib 3 is the same as the impeller's rotation direction, reducing... Low fluid shear energy consumption, improved hydraulic efficiency, and the spiral guide rib 3 has a guide angle of 15°-35°. The height of the spiral guide rib 3 is 5%-8% of the diameter of the inlet pipe 2. The starting end of the spiral guide rib 3 extends to the inlet flange end face and the ending end extends to the edge of the impeller suction port. The inlet pipe 2 has a conical contraction structure, which gradually accelerates the fluid and further reduces the risk of fluid stagnation. The inner wall of the inlet pipe 2 is covered with a nano-scale graphene-filled PTFE layer to eliminate "crystallization hot spots" caused by local supercooling and enhance thermal conductivity to inhibit local supercooling crystallization.

[0020] The spiral guide rib 3 has a streamlined semi-elliptical cross section. The elliptical curvature increases the near-wall velocity gradient by 40%, breaks up crystal nucleus aggregation, and makes the fluid flow smoothly and accelerates without flow separation.

[0021] Two to three spiral guide ribs 3 are provided and distributed circumferentially. Multiple spiral guide ribs 3 form a full-circumferential high-speed shear layer on the cross section of the inlet pipe 2, which uniformly reduces the risk of cavitation and extends the impeller life.

[0022] An electric heating coil 5 is coaxially nested outside the inlet pipe 2. The electric heating coil 5 generates heat to heat the fluid inside the inlet pipe 2, raising the fluid temperature above the crystallization point and preventing crystallization caused by low temperature. An isolation sleeve 4 is fitted outside the electric heating coil 5 to protect it. A high thermal conductivity insulating ceramic layer 6 is filled between the electric heating coil 5 and the outer wall of the inlet pipe 2. The high thermal conductivity insulating ceramic layer 6 efficiently transfers the heat from the coil to the inner wall of the inlet pipe 2 flow channel. The uniform heat transfer of the thermally conductive ceramic layer prevents local overheating and deformation of the fluoroplastic. A temperature sensor 7 is embedded in the inner wall of the inlet pipe 2 to monitor the temperature inside the inlet pipe.

[0023] The working principle of this utility model is as follows: the spiral guide ribs 3 on the inner wall of the inlet pipe 2 force the fluid to form a high-speed swirling flow in the same direction before entering the impeller, eliminating the stagnant flow zone at the inlet and preventing fluid stagnation and crystallization. The high-velocity swirling flow continuously washes the pipe wall, destroying the crystal nucleus adhesion. The streamlined semi-elliptical cross-section design increases the near-wall velocity gradient by 40%, inhibiting crystal nucleus aggregation. The conical design of the inlet pipe 2 gradually accelerates the fluid, further reducing the risk of stagnation. The electric heating coil 5 nested on the outer wall of the inlet pipe 2 generates heat, which is uniformly transferred to the inner wall of the flow channel through the high thermal conductivity insulating ceramic layer 6. The temperature sensor 7 monitors the fluid temperature in real time and dynamically adjusts the heating power to avoid low-temperature crystallization.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A fluoroplastic chemical centrifugal pump inlet anti-crystallization structure, comprising a pump body (1) and a pump cover (11), characterized in that: The pump cover (11) is fixedly installed with an inlet pipe (2) at the front end. The inner wall of the inlet pipe (2) is integrally formed with a spiral guide rib (3). The spiral guide rib (3) rotates in the same direction as the impeller. The guide angle of the spiral guide rib (3) is 15°-35°. The height of the spiral guide rib (3) is 5%-8% of the diameter of the inlet pipe (2). The starting end of the spiral guide rib (3) extends to the inlet flange end face and the ending end extends to the edge of the impeller suction port. The inlet pipe (2) is a tapered contraction structure. The inner wall of the inlet pipe (2) is covered with a nano-scale graphene-filled PTFE layer.

2. The fluoroplastic chemical centrifugal pump inlet anti-crystallization structure according to claim 1, characterized in that: The cross-section of the spiral guide rib (3) is a streamlined semi-ellipse.

3. The fluoroplastic chemical centrifugal pump inlet anti-crystallization structure according to claim 1, characterized in that: The spiral guide ribs (3) are provided in 2 to 3 circumferentially distributed.

4. The fluoroplastic chemical centrifugal pump inlet anti-crystallization structure according to claim 1, characterized in that: The inlet pipe (2) is coaxially nested with an electric heating coil (5).

5. The fluoroplastic chemical centrifugal pump inlet anti-crystallization structure according to claim 4, characterized in that: An isolation sleeve (4) is provided on the outside of the heating coil (5).

6. The fluoroplastic chemical centrifugal pump inlet anti-crystallization structure according to claim 4, characterized in that: The space between the heating coil (5) and the outer wall of the inlet pipe (2) is filled with a high thermal conductivity insulating ceramic layer (6).

7. The fluoroplastic chemical centrifugal pump inlet anti-crystallization structure according to claim 1, characterized in that: A temperature sensor (7) is embedded in the inner wall of the inlet pipe (2).

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