Anti-cavitation protection device for perfluoropolyether delivery pump

Abstract

This utility model discloses an anti-cavitation protection device for a perfluoropolyether (PFPE) transfer pump, comprising a pipe installed between the pump body and the PFPE transfer pipe. A flat tube is welded to the outer wall of the pipe, and the flat tube communicates with the pipe. A cleaning structure is installed inside the flat tube to remove sludge from the joints between the pump body and the pipe, and between the pipe and the PFPE transfer pipe. A sealing structure is installed at the bottom of the flat tube to allow opening and closing of the connection between the pipe and the flat tube. This utility model utilizes a figure-eight-shaped arrangement of two soft brushes to simultaneously clean foreign matter buildup at both the joints between the pump body and the pipe, and between the pipe and the transfer pipe. After cleaning, the brushes are completely retracted into the flat tube cavity, achieving physical isolation from the transfer pipe and eliminating turbulence disturbances generated by rotating components within the flow channel. The entire device is connected between the transfer pump and the PFPE transfer pipe via a pipe, and the modular design of the device improves the efficiency of equipment installation and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of delivery pump technology, specifically to a cavitation protection device for a perfluoropolyether delivery pump. Background Technology

[0002] Perfluoropolyethers have excellent lubricity and are commonly used in aerospace, precision instruments, vacuum pumps, and high-temperature bearings. Perfluoropolyether transfer pumps require protection against cavitation during operation. When cavitation occurs, bubbles formed in the liquid burst in high-pressure areas, generating microjet streams and shock waves. This can lead to pitting, cracking, or spalling on the pump's inner wall, impeller, and other components, affecting the pump's long-term reliability.

[0003] A search revealed a flow meter with anti-cavitation and explosion protection for cleaning mud and dirt at the connection port, disclosed in patent application publication number CN111103023B. Its structure includes a flow display, a connection structure, a flow tube, and a micro display. The flow display is installed and connected to the connection structure, and the connection structure is locked to the flow tube and the two are connected. The micro display is embedded in the flow display. The flow tube is composed of a triangular head, a side locking plate, an inner ring structure, an insert ring, and a cross flow tube.

[0004] The aforementioned patent uses an inner ring structure to clean foreign matter and scale at the connection between pipes and instruments, preventing cavitation caused by sudden pressure drops due to pipe inlet blockage and insufficient suction flow, thus improving the equipment's anti-cavitation effect. However, the stacked plate structure of the aforementioned patent, such as the Y-brush and drive pulley, may cause local turbulence or pressure fluctuations during the cleaning process, especially in high-speed fluids, potentially creating low-pressure areas that could induce cavitation. Utility Model Content

[0005] The purpose of this utility model is to provide a cavitation protection device for a perfluoropolyether delivery pump. By adding a pipe between the pump body and the perfluoropolyether delivery pipe, a cleaning structure installed in the pipe can simultaneously clean the joint between the pump body and the pipe, as well as the joint between the pipe and the perfluoropolyether delivery pipe, to prevent foreign objects from causing local turbulence at the pipe opening. Moreover, the cleaning structure can be retracted into a flat pipe outside the pipe when the pump body is working, without affecting the perfluoropolyether delivery.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cavitation protection device for a perfluoropolyether transfer pump, comprising a pipe installed between the pump body and the perfluoropolyether transfer pipe, a flat tube welded to the outer wall of the pipe, the flat tube communicating with the pipe, a cleaning structure for removing sludge from the joint between the pump body and the pipe and the joint between the pipe and the perfluoropolyether transfer pipe provided inside the flat tube, and a sealing structure for opening and closing the connection between the pipe and the flat tube installed at the bottom end of the flat tube;

[0007] The cleaning structure includes a soft brush and a housing that provides a mounting position for the soft brush. The housing is provided with a telescopic structure that drives the soft brush to extend and retract. The side wall at the bottom of the housing has a through hole for the soft brush to pass through.

[0008] Preferably, the telescopic structure includes an inner electric push rod, which is installed inside the housing by screws, and one end of the soft brush is fixedly connected to the telescopic end of the inner electric push rod.

[0009] Preferably, the soft brush includes a rubber rod and bristles fixed to the outer wall of the rubber rod. Two sets of soft brushes are provided. A cavity is provided inside the housing to accommodate the two sets of soft brushes. The cavity is connected to a through hole. A guide structure is provided inside the cavity to reduce the friction between the soft brush and the inner wall of the cavity.

[0010] Preferably, the guiding structure includes a guide ring fixed to the outer wall of the soft brush, and the outer wall of the guide ring is equipped with balls for contacting the inner wall of the cavity, and the two sets of cavities are arranged in a figure-eight shape.

[0011] Preferably, the sealing structure includes a contour block that seals the connection between the pipe and the flat pipe. The lower surface of the contour block is arc-shaped, and the outer wall of the contour block has clearance holes for two sets of soft brushes to pass through.

[0012] Preferably, the enclosed structure further includes a housing, which is fixed to the outside of the pipe. An external electric push rod for driving the lifting and lowering of the contour block is installed on the top of the housing by screws, and the telescopic end of the external electric push rod is fixedly connected to the top of the housing.

[0013] Preferably, flanges are welded to both ends of the pipe, and the flanges are located on both sides of the outer shell.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model uses a figure-eight-shaped double soft brush structure to simultaneously clean the foreign matter accumulation at the joints between the pump body and the pipeline, and between the pipeline and the delivery pipe. After cleaning, the brush body is completely retracted into the flat tube cavity, achieving physical isolation from the delivery pipeline. This can eliminate the turbulent disturbances generated by the rotating parts in the flow channel and avoid the aggravation of cavitation caused by pressure fluctuations due to structural interference.

[0016] 2. The entire device is connected to the delivery pump and the perfluoropolyether delivery pipe through a pipeline. When the anti-cavitation device needs maintenance, the flanges at both ends of the pipeline can be removed. The modular design of the device can improve the installation and maintenance efficiency of the equipment. Attached Figure Description

[0017] Figure 1 This is an isometric drawing of this utility model;

[0018] Figure 2 This is a schematic diagram of the external structure of the cleaning structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the internal structure of the cleaning structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the soft brush of this utility model;

[0021] Figure 5 This is a schematic diagram of the internal structure of the casing of this utility model.

[0022] In the diagram: 1. Pipe; 2. Flat pipe; 3. Cleaning structure; 4. Sealing structure; 301. Soft brush; 302. Housing; 304. Through hole; 3031. Inner electric push rod; 3011. Rubber rod; 3012. Brush bristles; 3021. Cavity; 305. Guide ring; 306. Ball bearing; 401. Contouring block; 402. Clearance hole; 403. Outer shell; 404. Outer electric push rod; 405. Flange. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-5 This utility model provides a technical solution: a cavitation protection device for a perfluoropolyether transfer pump, including a pipe 1 installed between the pump body and the perfluoropolyether transfer pipe, a flat pipe 2 welded to the outer wall of the pipe 1, the flat pipe 2 communicating with the pipe 1, a cleaning structure 3 provided inside the flat pipe 2 for removing sludge from the joint between the pump body and the pipe 1 and the joint between the pipe 1 and the perfluoropolyether transfer pipe, and a sealing structure 4 installed at the bottom end of the flat pipe 2 for opening and closing the connection between the pipe 1 and the flat pipe 2;

[0025] The flat tube 2 is welded to the pipe 1 to ensure that the main delivery pipeline is not damaged when the device is removed.

[0026] The cleaning structure 3 includes a soft brush 301 and a housing 302 that provides a mounting position for the soft brush 301. The housing 302 is provided with a telescopic structure that drives the soft brush 301 to extend and retract. The side wall at the bottom of the housing 302 is provided with a through hole 304 through which the soft brush 301 passes.

[0027] When pressure fluctuations are detected during pump operation, the outer electric actuator 404 drives the housing 302 and the contour block 401 to move downwards as a whole. The inner electric actuator 3031 pushes the flexible brush 301 with guide ring 305 to extend, so that the two sets of flexible brushes 301 arranged in a figure-eight shape are aligned with the joints between the pump body and pipe 1, and between pipe 1 and the delivery pipe, respectively. Under the reciprocating drive of the inner electric actuator 3031, the brush bristles 3012 physically scrape away the perfluoropolyether degradation products and metal oxides deposited on the flange sealing surface, preventing the formation of local eddies due to the accumulation of foreign matter at the joint.

[0028] The telescopic structure includes an inner electric push rod 3031, which is installed inside the housing 302 by screws. One end of the soft brush 301 is fixedly connected to the telescopic end of the inner electric push rod 3031.

[0029] After the internal electric push rod 3031 is started, it pushes the soft brush 301 to move up and down.

[0030] The soft brush 301 includes a rubber rod 3011 and bristles 3012 fixed to the outer wall of the rubber rod 3011. Two sets of soft brushes 301 are provided. The housing 302 has a cavity 3021 for accommodating the two sets of soft brushes 301. The cavity 3021 is connected to the through hole 304. A guide structure is provided in the cavity 3021 to reduce the friction between the soft brush 301 and the inner wall of the cavity 3021.

[0031] The soft brush 301 is made of perfluoroether rubber, which has extremely strong resistance to perfluoropolyether, strong acids, strong alkalis, organic solvents, etc. It also has flexibility and wear resistance, and can withstand the reciprocating extension and retraction movement of the soft brush 301 at the seam while maintaining the scraping cleaning force.

[0032] The guiding structure includes a guide ring 305 fixed to the outer wall of the soft brush 301. The outer wall of the guide ring 305 is equipped with ball bearings 306 for contacting the inner wall of the cavity 3021. The two sets of cavities 3021 are arranged in a figure-eight shape.

[0033] The ball bearing 306 effectively reduces friction on the inner wall of the cavity 3021, allowing the rubber bristles 3012 to penetrate the seam.

[0034] The closed structure 4 includes a contour block 401 that seals the connection between the pipe 1 and the flat pipe 2. The lower surface of the contour block 401 is arc-shaped, and the outer wall of the contour block 401 has a clearance hole 402 for two sets of soft brushes 301 to pass through.

[0035] The device can be replaced as a whole without disassembling each component during maintenance, which can shorten the downtime maintenance cycle.

[0036] The enclosed structure 4 also includes a housing 403, which is fixed to the outside of the pipe 1. An external electric push rod 404 for driving the contour block 401 to rise and fall is installed on the top of the housing 403 by screws. The telescopic end of the external electric push rod 404 is fixedly connected to the top of the housing 302.

[0037] After cleaning is complete, the inner electric push rod 3031 retracts the soft brush 301 completely into the cavity 3021 of the flat tube 2, and the guide ring 305 ensures the stable retraction trajectory of the brush bristles 3012. At this time, the contour block 401 moves upward under the action of the outer electric push rod 404, forming a surface contact seal with the inner wall of the pipe 1 through its arc-shaped bottom surface, thus isolating the flat tube 2 from the pipe 1. Compared with the traditional rotary scraper installed in the flow channel, this avoids cavitation bubbles caused by a sudden pressure drop due to structural protrusions.

[0038] Flanges 405 are welded to both ends of the pipe 1, and the flanges 405 are located on both sides of the outer shell 403.

[0039] The 405 welded flange structure enables quick connection between the entire device and the pump body or delivery pipe. During maintenance, the entire device can be removed simply by disassembling the flange bolts.

[0040] When pressure fluctuations are detected during pump operation, the outer electric push rod 404 drives the housing 302 to move downwards as a whole, the contour block 401 moves downwards, and the inner electric push rod 3031 is activated, causing the two soft brushes 301 to extend out from the gap between the contour block 401 and the inner cavity of the pipe 1. The soft brushes 301 are made of perfluoroether rubber, which has both flexibility and wear resistance. Through the reciprocating movement of the inner electric push rod 3031, one end of the two soft brushes 301 scrapes inside the pipe 1, and removes the perfluoropolyether degradation products and metal oxides deposited on the flange sealing surface through physical scraping, preventing the formation of local eddies due to the accumulation of foreign matter at the joint.

[0041] After cleaning, the two soft brushes 301 are retracted into the housing 302 by activating the inner electric push rod 3031, and the housing 302 and the contour block 401 are moved upward together by the outer electric push rod 404. The contour block 401 blocks the connection between the pipe 1 and the flat pipe 2. The arc-shaped bottom surface of the contour block 401 forms a surface contact seal with the inner wall of the pipe 1, thus isolating the flat pipe 2 from the pipe 1.

[0042] Compared with traditional anti-cavitation structures, this anti-cavitation device can be drawn into the flat pipe 2 outside the pipeline 1 when the pump is working, and will not cause local turbulence due to the built-in structure.

[0043] 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 full-fluoropolyether transfer pump anti-cavitation protection device, characterized by: It includes a pipe (1) installed between the pump body and the perfluoropolyether delivery pipe, a flat pipe (2) welded to the outer wall of the pipe (1), the flat pipe (2) being connected to the pipe (1), a cleaning structure (3) provided inside the flat pipe (2) for removing sludge from the joint between the pump body and the pipe (1) and the joint between the pipe (1) and the perfluoropolyether delivery pipe, and a sealing structure (4) installed at the bottom end of the flat pipe (2) for opening and closing the connection between the pipe (1) and the flat pipe (2); The cleaning structure (3) includes a soft brush (301) and a housing (302) that provides a mounting position for the soft brush (301). The housing (302) is provided with a telescopic structure that drives the soft brush (301) to extend and retract. The side wall at the bottom of the housing (302) is provided with a through hole (304) through which the soft brush (301) passes.

2. A device for preventing cavitation of a perfluoropolyether delivery pump according to claim 1, characterized in that: The telescopic structure includes an inner electric push rod (3031), which is installed inside the housing (302) by screws. One end of the soft brush (301) is fixedly connected to the telescopic end of the inner electric push rod (3031).

3. A cavitational protection device for a perfluoropolyether delivery pump according to claim 2, characterized in that: The soft brush (301) includes a rubber rod (3011) and bristles (3012) fixed to the outer wall of the rubber rod (3011). Two sets of soft brushes (301) are provided. A cavity (3021) for accommodating the two sets of soft brushes (301) is provided inside the housing (302). The cavity (3021) is connected to the through hole (304). A guide structure is provided inside the cavity (3021) to reduce the friction between the soft brush (301) and the inner wall of the cavity (3021).

4. A cavitational protection device for a perfluoropolyether delivery pump according to claim 3, characterized in that: The guiding structure includes a guide ring (305) fixed to the outer wall of the soft brush (301). The outer wall of the guide ring (305) is equipped with ball bearings (306) for contacting the inner wall of the cavity (3021). The two sets of cavities (3021) are arranged in a figure-eight shape.

5. A cavitational protection device for a perfluoropolyether delivery pump according to claim 4, characterized in that: The closed structure (4) includes a contour block (401) that seals the connection between the pipe (1) and the flat pipe (2). The lower surface of the contour block (401) is arc-shaped, and the outer wall of the contour block (401) has a clearance hole (402) for two sets of soft brushes (301) to pass through.

6. The anti-cavitation protection device for a perfluoropolyether transfer pump according to claim 5, characterized in that: The enclosed structure (4) also includes a housing (403), which is fixed to the outside of the pipe (1). An external electric push rod (404) for driving the contour block (401) to rise and fall is installed on the top of the housing (403) by screws. The telescopic end of the external electric push rod (404) is fixedly connected to the top of the casing (302).

7. A cavitational protection device for a perfluoropolyether delivery pump according to claim 6, characterized in that: Both ends of the pipe (1) are welded with flanges (405), which are located on both sides of the outer shell (403).

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