A back-flushable filter

Abstract

The utility model discloses a filter of reverse flushing, including the straight pipe section and the inclined pipe of integral structure, the straight pipe section pipe wall outside intercommunication inclined pipe, and the inside of inclined pipe is equipped with the inclined wall, and the one end of inclined wall is integrative with straight pipe section, and the one side surface cooperation straight pipe section of inclined wall forms the second flow channel of oblique downward, and the second flow channel is turned after the inside of inclined pipe and is formed the third flow channel of direction oblique upward by the one side surface cooperation inclined pipe of another side surface of inclined wall, and the inside of inclined pipe between second flow channel and third flow channel is equipped with the filter ring, and the one end of filter ring is connected inclined wall, and the other end is connected the plug cap, and the plug cap sealed connection inclined pipe. The utility model discloses through the second flow channel of oblique downward cooperation third flow channel of oblique upward forms the reverse water flow, and the filter ring in the inside of cooperation inclined pipe filters the impurity in fluid, and has the reverse flushing function of prolonging the service life of filter ring simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of filter technology, and in particular to a backwash filter. Background Technology

[0002] In piping systems, filters are indispensable components used to remove impurities from fluids, ensuring normal system operation and extending equipment lifespan. Traditional filter designs often suffer from complex connections and inconvenient maintenance, especially in scenarios requiring frequent filter replacement or cleaning. Multiple bolt connections make assembly and disassembly cumbersome and inefficient, and prolonged use can lead to loosening and leakage, reducing service life. Improving the ease of installation and lifespan of filters is a subject of research for those skilled in the art. Furthermore, existing filters often suffer from incomplete backwashing, unreasonable flow channel design leading to increased pressure loss, and a lack of real-time monitoring of operating status, all of which limit the filter's effectiveness and applicability. Therefore, existing technologies urgently need improvement to address these issues. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings and deficiencies of the existing technology by providing a backwashing filter with the advantages of compact structure, convenient disassembly and assembly, thorough rinsing and low pressure loss.

[0004] This invention provides a backwashing filter, comprising a straight pipe section and an inclined pipe of integral structure. The outer wall of the straight pipe section is connected to the inclined pipe, and the inner wall of the inclined pipe is provided with an inclined wall. One end of the inclined wall is integrally formed with the straight pipe section. One side of the inclined wall cooperates with the straight pipe section to form a downward-sloping second flow channel. After turning inside the inclined pipe, the second flow channel forms a third flow channel with the other side of the inclined wall and the inclined pipe. A filter ring is provided inside the inclined pipe between the second and third flow channels. One end of the filter ring is connected to the inclined wall, and the other end is connected to a plug cap, which seals the connection to the inclined pipe. This invention uses the downward-sloping second flow channel and the upward-sloping third flow channel to form a reverse water flow. Combined with the filter ring inside the inclined pipe, it filters impurities in the fluid while providing a backwashing function to extend the service life of the filter ring.

[0005] The plug is threadedly connected to the inclined tube, and a sealing ring is provided between the plug and the inclined tube. One end of the filter ring is connected to the mounting groove located on the side of the inclined wall, and the other end of the filter ring is fitted and connected to the plug.

[0006] The inlet end of the straight pipe section forms a first flow channel, and the outlet end of the straight pipe section forms a fourth flow channel. The medium in the first flow channel flows through the second flow channel, the third flow channel, and the fourth flow channel in sequence.

[0007] An arc-shaped connecting channel is provided between the third and fourth flow channels, and the arc-shaped connecting channel is located at the junction of the straight pipe section and the inclined pipe.

[0008] Both ends of the straight pipe section are connected to movable joints. One end of the movable joint is threaded to the straight pipe section, and the other end of the movable joint is provided with a flange. A movable nut is sleeved on the outer circumference of the movable joint between the flange and the straight pipe section.

[0009] The outer wall of the straight pipe section is equipped with a pressure sensor interface and a temperature sensor interface, respectively.

[0010] As can be seen from the above, the backwashing filter provided in this application forms a multi-channel structure through the combination of an integrated straight pipe section and an inclined pipe. Combined with the design of a detachable plug and filter ring, it simplifies the disassembly and assembly process and optimizes the fluid path, effectively solving the problems of difficult maintenance, incomplete flushing and high pressure loss of traditional filters. It has the advantages of compact structure, convenient disassembly and assembly, thorough flushing and low pressure loss. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a three-dimensional structural diagram of a backwashing filter according to the present invention;

[0013] Figure 2 This is a side view of the backwashing filter structure according to the present invention;

[0014] Figure 3 for Figure 2 Cross-sectional view of the structure at point BB and schematic diagram of medium flow direction;

[0015] Figure 4 This is a schematic diagram of the other side of the reverse flushing filter according to the present invention;

[0016] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure at the CC section. Detailed Implementation

[0017] The following description, in conjunction with the embodiments of this utility model, includes appendices. Figure 1-5The technical solutions in this application are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of this application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0018] In existing technologies, traditional filter designs in pipeline systems generally suffer from complex connection structures and low maintenance efficiency. To address the backflushing requirement, this study investigates the possibility of optimizing the fluid redirection path and attempts to achieve self-cleaning of the flow channel within a limited space. Based on fluid mechanics principles, a vortex is formed by guiding the medium through a sloped wall at a specific angle, while simultaneously exploring sealing solutions for rapid filter element replacement.

[0019] Therefore, this application proposes a backwash filter, comprising a straight pipe section 25 and an inclined pipe 26 of integral structure, characterized in that: the outer side of the straight pipe section is connected to the inclined pipe 26, and the inner side of the inclined pipe is provided with an inclined wall 38. One end of the inclined wall 38 is integrally formed with the straight pipe section 25. One side of the inclined wall 38 cooperates with the straight pipe section 25 to form a downward inclined second flow channel 302. After the second flow channel turns inside the inclined pipe, the other side of the inclined wall 38 cooperates with the inclined pipe 26 to form a third flow channel 303 with an upward inclined direction. A filter ring 32 is provided inside the inclined pipe between the second flow channel and the third flow channel. One end of the filter ring is connected to the inclined wall, and the other end is connected to a plug cap 33. The plug cap 33 is sealed and connected to the inclined pipe 26.

[0020] The integrated structure of the straight and inclined pipe sections refers to the two pipe bodies being cast or welded together to form a seamless whole, eliminating the leakage risk associated with traditional flange connections. The inclined angle of the inclined wall guides the fluid to create a centrifugal effect, causing impurities to accumulate in specific areas. The downward inclination of the second flow channel and the upward inclination of the third flow channel create opposite flow paths, forcing a velocity change at the filter ring and enhancing impurity interception. The sealing connection of the plug uses an end-face compression sealing method, such as axial sealing achieved by compressing the sealing ring when the thread is tightened.

[0021] Specifically, after entering the straight pipe section, the fluid first flows downward along the second flow channel, then turns at the bottom of the inclined pipe and flows upward along the third flow channel. This sudden change in flow direction causes impurities in the fluid to impact the surface of the filter ring due to inertia, while larger particles are trapped on the outside of the filter ring.

[0022] Compared to existing technologies, traditional filters require the removal of multiple bolts to replace the filter element. This solution, however, utilizes a lateral opening design with an inclined tube to allow for axial removal and placement of the filter ring, reducing maintenance time by approximately 60%. Existing split-type flange connections present at least four potential leakage points; this solution employs an integrated structure to reduce these leakage points to a single-sided sealing position on the cap.

[0023] Through the above technical solutions, this application achieves a rapid filter element replacement function, significantly reducing the risk of damage to the integrity of the pipeline system during maintenance. The flow channel reversal design of the backflushing structure improves impurity removal efficiency and extends the service life of the filter rings. The integrated structure eliminates the risk of leakage at multiple connection points, making it suitable for long-term stable operation scenarios with high-pressure media.

[0024] This application further proposes that the plug 33 is threadedly connected to the inclined tube 26, and a sealing ring 37 is provided between the plug 33 and the inclined tube 26.

[0025] Threaded connection refers to the detachable connection between the plug and the inclined tube achieved through the mating of internal and external threads. Metric threads or pipe threads can be used, and the thread pitch and profile can be selected according to actual needs. The sealing ring is an annular sealing element placed between the plug and the inclined tube contact surface. It can be made of rubber or polytetrafluoroethylene (PTFE), and its cross-sectional shape can be O-shaped, rectangular, or irregular.

[0026] Compared to existing technologies, traditional filters using flange bolt connections require tightening multiple bolts individually, while threaded connections only require rotating the cap to complete installation, reducing the number of steps. Existing technologies relying solely on metal-to-metal contact for sealing are prone to leakage due to machining errors, while the elastic compensation characteristics of the sealing ring can adapt to minute deformations, reducing the risk of leakage.

[0027] Through the above technical solution, this application realizes the quick disassembly and assembly of the plug cap, shortens the maintenance time, and at the same time eliminates the thread fit gap through the sealing ring, preventing fluid leakage from the plug cap connection and extending the service life of the filter under high pressure conditions.

[0028] This application further proposes that the inlet end of the straight pipe section 25 forms a first flow channel 301, and the outlet end of the straight pipe section 25 forms a fourth flow channel 304. The medium in the first flow channel 301 flows through the second flow channel 302, the third flow channel 303, and the fourth flow channel 304 in sequence.

[0029] The first flow channel refers to the fluid passage located at the inlet end of the straight pipe section. This can be implemented using an internal cavity structure coaxial with the straight pipe section, guiding the medium axially into the filter. The fourth flow channel refers to the fluid passage located at the outlet end of the straight pipe section. This can be implemented by adding a narrowing or widening section at the end of the straight pipe section, allowing the filtered medium to exit the system. The medium flow sequence refers to the fluid entering through the first flow channel and then sequentially passing through the second, third, and fourth flow channels. This directional guidance can be achieved through interconnecting structures between the flow channels, preventing turbulence or stagnation of the medium during filtration.

[0030] Specifically, after entering through the first flow channel, the medium flows downwards at an angle along the second flow channel, then turns upwards at an angle in the third flow channel, and finally exits through the fourth flow channel. By defining the sequence and direction of the flow channels, the fluid flow path is strictly constrained, allowing impurities to be effectively trapped by the filter rings while reducing pressure loss caused by abrupt changes in flow direction. The integrated design of the straight pipe section and each flow channel further reduces the complexity of the connection structure, thereby reducing the potential risk of leakage.

[0031] Through the above technical solution, this application can achieve stable flow of the medium during the filtration process, avoid the accumulation of impurities in the flow channel, and reduce the risk of leakage through the integrated flow channel structure, thereby extending the service life of the filter and improving maintenance efficiency.

[0032] This application further proposes that an arc-shaped connecting channel 305 is provided between the third flow channel 303 and the fourth flow channel 304, and the arc-shaped connecting channel 305 is located at the junction of the straight pipe section 25 and the inclined pipe 26.

[0033] The arc-shaped connecting channel refers to the curved transition structure connecting the third and fourth flow channels. Specifically, it can be achieved by using an arc-shaped inner wall integrally formed with the straight pipe section and the inclined pipe. This channel reduces the local turbulence intensity by eliminating right-angle bends, thus dispersing the impact force generated when the medium flow direction changes. The junction of the straight pipe section and the inclined pipe refers to the spatial region formed by the intersection of the axes of the straight pipe section and the inclined pipe.

[0034] Through the above technical solution, this application solves the technical problems of turbulence and pressure loss easily generated at the turning points of traditional filter channels. The arc-shaped connecting channel reduces the kinetic energy loss when the medium turns, improving the system operating efficiency. At the same time, this structure avoids stress concentration at right-angle connections, extending the service life of pipe connections and improving the cleaning efficiency during backflushing.

[0035] This application further proposes that both ends of the straight pipe section 25 are connected to movable joints 35. One end of the movable joint 35 is threaded to the straight pipe section 25, and the other end of the movable joint 35 is provided with a flange. A movable nut 34 is sleeved on the outer circumference of the movable joint 35 between the flange and the straight pipe section 25.

[0036] The movable joint is a transition component used to connect pipes to straight pipe sections. It can be made of metal or high-strength plastic and has internal through holes to allow fluid flow. This structure allows for quick installation via threaded connection, avoiding the bolt tightening steps required for traditional flange connections. The flange refers to the outward-extending annular flange at the end of the movable joint, which can be formed through stamping or casting processes. It limits the axial displacement range of the movable nut, preventing the joint from falling off during installation. The movable nut is a fastening component that fits around the outer circumference of the movable joint. It can be a hexagonal nut or a threaded sleeve structure. The tightness of the connection with the external pipe is adjusted by rotation, achieving pressure control of the sealing surface.

[0037] Specifically, after the movable joint is fixed to the straight pipe section via threads, an axial gap is formed between its flanged end and the end face of the straight pipe section. A movable nut is fitted onto the outer circumference of the movable joint corresponding to this gap. When an external pipe is inserted into the movable joint, rotating the movable nut pushes the flange to contact the pipe end face, thereby tightening the sealing ring. This structure eliminates the need for multiple bolts; connection is achieved solely through a single-point threaded fit and axial tightening with the movable nut. Disassembly and assembly are performed simply by rotating the movable nut to release the constraint.

[0038] Through the above technical solution, this application solves the problems of low disassembly and assembly efficiency and easy loosening of connection structure in traditional filters. It achieves quick installation and reliable sealing by adjusting the single point of the movable nut, while reducing the number of connecting parts and reducing the probability of failure caused by complex structure during maintenance.

[0039] This application further proposes that the outer wall of the straight pipe section 25 is provided with a pressure sensor interface 29 and a temperature sensor interface 28 respectively.

[0040] The pressure sensor interface refers to the connection structure used to install the pressure sensor. It can be implemented using a threaded interface or a flange interface, forming a sealed connection with the outer wall of the straight pipe section for real-time monitoring of the fluid pressure inside the straight pipe section. Similarly, the temperature sensor interface refers to the connection structure used to install the temperature sensor. It can also be implemented using a threaded interface or a flange interface, forming a sealed connection with the outer wall of the straight pipe section for real-time monitoring of the fluid temperature inside the straight pipe section.

[0041] Through the above technical solution, this application achieves seamless integration of sensor installation with the pipeline body, reducing the complexity of sensor disassembly and assembly during maintenance. At the same time, through real-time pressure and temperature monitoring, abnormal states of the filtration system can be detected in a timely manner, avoiding equipment damage caused by sudden pressure changes or abnormal temperatures.

[0042] This application further proposes that one end of the filter ring 32 is connected to the mounting groove 30 located on the side of the inclined wall 38, and the other end of the filter ring 32 is fitted and connected to the plug cap 33. Through the above technical solution, this application achieves quick disassembly and assembly of the filter ring and reliable sealing, reducing maintenance time and leakage risk, and is especially suitable for pipeline systems that require frequent cleaning or replacement of filter elements.

[0043] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A back-flushable filter comprising a straight pipe section (25) and an inclined pipe (26) in one piece, characterized in that: The straight pipe section is connected to the inclined pipe (26) on the outside. The inclined pipe is provided with an inclined wall (38) on the inside. One end of the inclined wall (38) is integrally formed with the straight pipe section (25). One side of the inclined wall (38) cooperates with the straight pipe section (25) to form a downward inclined second flow channel (302). After the second flow channel turns inside the inclined pipe, it is formed by the other side of the inclined wall (38) and the inclined pipe (26) to form a third flow channel (303) with an upward inclined direction. A filter ring (32) is provided inside the inclined pipe between the second flow channel and the third flow channel. One end of the filter ring is connected to the inclined wall, and the other end is connected to the plug cap (33). The plug cap (33) is sealed to the inclined pipe (26).

2. A back-flushable filter according to claim 1, characterised in that: The plug (33) is threaded to the inclined tube (26), and a sealing ring (37) is provided between the plug (33) and the inclined tube (26).

3. A back-flushable filter according to claim 1, wherein: The inlet end of the straight pipe section (25) forms a first flow channel (301), and the outlet end of the straight pipe section (25) forms a fourth flow channel (304). The medium in the first flow channel (301) flows through the second flow channel (302), the third flow channel (303), and the fourth flow channel (304) in sequence.

4. A back-flushable filter according to claim 1, wherein: An arc-shaped connecting channel (305) is provided between the third flow channel (303) and the fourth flow channel (304), and the arc-shaped connecting channel (305) is located at the junction of the straight pipe section (25) and the inclined pipe (26).

5. A back-flushable filter according to claim 1, wherein: Both ends of the straight pipe section (25) are connected to movable joints (35). One end of the movable joint (35) is threaded to the straight pipe section (25), and the other end of the movable joint (35) is provided with a flange. The movable joint (35) between the flange and the straight pipe section (25) is fitted with a movable nut (34) on the outer circumference.

6. A back-flushable filter according to claim 1, wherein: The outer wall of the straight pipe section (25) is provided with a pressure sensor interface (29) and a temperature sensor interface (28).

7. A back-flushable filter according to claim 1, wherein: One end of the filter ring (32) is connected to the mounting groove (30) located on the side of the inclined wall (38), and the other end of the filter ring (32) is fitted to the plug cap (33).

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