A filter device for a floor heating pipe

Abstract

The application relates to the technical field of heating pipeline, and particularly discloses a filtering device for a floor heating pipeline, which comprises a Y-shaped pipeline and a filter screen structure arranged in the Y-shaped pipeline; a plugging nut is threadedly connected to the end of a branch pipe section; characterized in that a spiral flow guide device is further arranged in the branch pipe section, the outer circumferential surface of the spiral flow guide device is arranged close to the inner wall of the filter screen structure, the spiral flow guide device is coaxially arranged with the filter screen structure, and an operating handle is arranged on the end wall of the plugging nut and connected to the end of the spiral flow guide device through the plugging nut; wherein the end of the operating handle close to the spiral flow guide device is rotationally sealed with the plugging nut. The maintenance convenience and efficiency of the floor heating pipeline filtering device are improved.

Description

Technical Field

[0001] This application relates to the field of heating pipeline technology, and more particularly to a filter device for underfloor heating pipelines. Background Technology

[0002] In underfloor heating systems, filtration devices are key components for ensuring unobstructed pipe flow and extending the lifespan of core equipment. By intercepting impurities such as mud, rust, and scale in the water flow, they can effectively prevent blockage of underfloor heating coils, wear of circulating pumps, and reduction in heat exchange efficiency. However, existing underfloor heating pipe filtration devices have significant maintenance deficiencies in practical applications, making it difficult to meet users' needs for convenient and safe use.

[0003] Existing filtration devices mostly use traditional filter cartridge snap-fit ​​or threaded fixing structures, making the filter cartridge cleaning process complex. Cleaning requires frequent opening and closing of valves on the main and branch pipes of the underfloor heating system, which is not only cumbersome but also prone to causing aging and deterioration of valve seals, affecting the long-term sealing performance of the system. Furthermore, filter cartridge disassembly and assembly rely on professionals. Non-professional users, unfamiliar with the sealing principles and system pressure control, are highly likely to cause seal failure during disassembly, leading to water jet leakage, environmental pollution, and safety hazards. In addition, when users need remote operation assistance, the cleaning operation involves multiple key steps such as valve opening and closing sequence and seal assembly precision. Verbal instructions are difficult to accurately convey the operational details, making remote assistance extremely difficult. This further increases maintenance costs and downtime for heating, making it unsuitable for user-managed maintenance scenarios. Utility Model Content

[0004] This application provides a filtration device for underfloor heating pipes, which solves the problem of cumbersome maintenance process of existing underfloor heating pipe filtration devices, and improves the convenience and efficiency of maintenance of underfloor heating pipe filtration devices.

[0005] This utility model provides a filtration device for underfloor heating pipes, comprising: a Y-shaped pipe and a filter structure arranged within the Y-shaped pipe; wherein the Y-shaped pipe includes a main inlet section and a main outlet section arranged coaxially along a straight line, and a branch pipe section inclinedly connected to the intersection of the main inlet section and the main outlet section, and the filter structure is coaxially arranged in the branch pipe section; a sealing nut is threadedly connected to the end of the branch pipe section; characterized in that: a spiral flow guiding device is also provided in the branch pipe section, the outer circumferential surface of the spiral flow guiding device is disposed close to the inner wall of the filter structure, and the spiral flow guiding device is coaxially arranged with the filter structure; and an operating handle, rotatably disposed on the end wall of the sealing nut, one end of which passes through the sealing nut and is connected to the end of the spiral flow guiding device; wherein the end of the operating handle near the spiral flow guiding device is rotatably sealed with the sealing nut.

[0006] In one possible implementation, a venturi tube is threadedly connected to the port of the main inlet section. The venturi tube is coaxially arranged with the main inlet section and is provided with a constriction section, a throat, and a diffuser section in sequence along the water flow direction.

[0007] In one possible implementation, the filter structure includes: an annular protrusion located at the intersection of the main inlet section and the branch pipe section; an inner filter and an outer filter, the outer filter being coaxially sleeved on the outer periphery of the inner filter; a slot formed on the side of the annular protrusion near the outer filter, the slot being annular and having a V-shaped cross-section, wherein one end of the outer filter and the inner filter are engaged in the slot; the ends of the outer filter and the inner filter away from the annular protrusion abut against the end wall of the sealing nut; wherein the filter hole diameter of the outer filter is larger than the filter hole diameter of the inner filter.

[0008] In one possible implementation, the spiral guide device includes: an extension column disposed at one end of the operating handle near the sealing nut; and spiral blades continuously wound around the outer peripheral wall of the extension column with the axis of the extension column as the center, without interruption along the entire axial length of the extension column.

[0009] In one possible implementation, the sealing nut includes: a nut body with a continuous threaded structure evenly distributed on its outer circumferential surface for threaded connection with the inner wall of the end of the branch pipe section; wherein a sealing ring is arranged between the nut body and the end wall of the branch pipe section; and a mounting hole located on the axis of the nut body for rotating and sealingly connecting the operating handle.

[0010] In one possible implementation, the operating handle includes: a connecting post disposed within the mounting hole and rotatably sealed to the mounting hole; wherein one end of the connecting post is coaxially connected to the extension post; and a handle body, one end of which is connected to the other end of the connecting post.

[0011] One or more technical solutions provided in the embodiments of this utility model have at least the following technical effects or advantages: The underfloor heating water flows in from the main inlet section of the Y-shaped pipe, enters the branch pipe section at the junction of the main inlet and main outlet sections, and then enters the filter structure coaxially arranged within this branch pipe section. Because the spiral guide device is coaxial with the filter structure and its outer circumference is close to the inner wall of the filter structure, the water flow is forcibly guided as it passes through the spiral guide device, forming a stable swirling flow along the inner wall of the filter structure. Finally, it permeates outward through the filter holes of the filter structure and flows to the main outlet section to complete the filtration. Simultaneously, the rotating sealing structure between the operating handle and the sealing nut ensures that water does not leak from the sealing end. After the filtration device has been running for a period of time, dirt will accumulate on the inner wall of the filter structure. By rotating the operating handle located on the end wall of the sealing nut, the end of the handle passing through the sealing nut drives the spiral guide device to rotate synchronously. The outer circumference of the rotating spiral guide device and the inner wall of the filter structure generate relative motion, creating a scraping effect on the accumulated dirt, peeling it off the inner wall of the filter and preventing continuous dirt buildup.

[0012] The spiral flow guide device directs the water flow to swirl and flow within the filter screen structure. Compared to the traditional straight-line filtration method, this increases the contact area and time between the water flow and the filter screen, ensuring that all areas of the filter screen can fully participate in filtration. This avoids filtration problems caused by dead zones in the local water flow, improving the uniformity and thoroughness of underfloor heating water filtration. The design of rotating the spiral flow guide device to scrape dirt via the operating handle eliminates the need to disassemble the sealing nut and filter screen structure, thus removing dirt and improving the cumbersome problem of traditional Y-type filters requiring disassembly and cleaning. Furthermore, the grinding effect formed during the scraping process can more thoroughly remove stubborn deposits of dirt, preventing increased water flow resistance and decreased underfloor heating circulation efficiency caused by filter screen clogging, extending the service life of the filter screen structure and the maintenance cycle of the filtration device. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments of this utility model or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of the filtering device provided in the embodiments of this application; Figure 2 This is a schematic diagram of a Y-shaped pipeline structure provided in an embodiment of this application; Figure 3 This is a schematic diagram of the annular protrusion structure provided in an embodiment of this application; Figure 4 This is a schematic diagram of the filter structure provided in an embodiment of this application; Figure 5 This is a schematic diagram of the operating handle structure provided in an embodiment of this application; Figure 6 This is a schematic diagram of a Venturi tube structure provided in an embodiment of this application.

[0015] icon: 100-Y type piping; 110 - Main inlet section; 120 - Main outlet section; 130 - Branch pipe section; 200-Filter Structure; 210 - Annular protrusion; 220 - Slot; 230 - Inner filter; 240 - Outer filter; 300 - Sealing nut; 310 - Nut body; 320 - Mounting hole; 400-Spiral Guide Device; 410 - Extended column; 420 - Helical blade; 500-Venturi tube; 510 - contraction segment; 520 - throat; 530 - diffusion segment; 600-Operating handle; 610 - Connecting post; 620 - Handle body. Detailed Implementation

[0016] 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, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0017] In the description of the embodiments of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the embodiments of this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, the terms "installed," "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; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0018] Example 1 Please see Figures 1-6 A filtration device for underfloor heating pipes includes: a Y-shaped pipe 100, and a filter structure 200 disposed within the Y-shaped pipe 100; wherein the Y-shaped pipe 100 includes a main inlet section 110 and a main outlet section 120 arranged coaxially along a straight line, and a branch pipe section 130 inclinedly connected to the intersection of the main inlet section 110 and the main outlet section 120, and the filter structure 200 is coaxially arranged in the branch pipe section 130; a sealing nut 300 is threadedly connected to the end of the branch pipe section 130; characterized in that... The branch pipe section 130 is further provided with a spiral guide device 400. The outer circumferential surface of the spiral guide device 400 is located close to the inner wall of the filter structure 200, and the spiral guide device 400 is coaxially arranged with the filter structure 200. An operating handle 600 is rotatably mounted on the end wall of the sealing nut 300, with one end passing through the sealing nut 300 and connected to the end of the spiral guide device 400. The end of the operating handle 600 near the spiral guide device 400 is rotatably sealed with the sealing nut 300.

[0019] In the above embodiment, the underfloor heating water flows in from the main inlet section 110 of the Y-shaped pipe 100, enters the branch pipe section 130 at the junction of the main inlet section 110 and the main outlet section 120, and then enters the filter screen structure 200 coaxially arranged within the branch pipe section. Because the spiral guide device 400 is coaxial with the filter screen structure 200 and its outer circumference is close to the inner wall of the filter screen structure 200, the water flow is forcibly guided by the spiral guide device 400, forming a stable swirling flow along the inner wall of the filter screen structure 200. Finally, it permeates outward through the filter holes of the filter screen structure 200 and flows to the main outlet section 120. The system achieves filtration; simultaneously, the rotating sealing structure between the operating handle 600 and the sealing nut 300 ensures that water flow will not leak from the sealing end; after the filter device has been running for a period of time, dirt will accumulate on the inner wall of the filter screen structure 200. By rotating the operating handle 600 located on the end wall of the sealing nut 300, the end of which passes through the sealing nut 300 drives the spiral guide device 400 to rotate synchronously. The outer circumferential surface of the rotating spiral guide device 400 and the inner wall of the filter screen structure 200 generate relative motion, forming a scraping action on the deposited dirt, peeling the dirt off the inner wall of the filter screen, and preventing the dirt from continuing to accumulate.

[0020] The spiral flow guide device 400 guides the water flow to swirl and flow within the filter screen structure 200. Compared to the traditional straight-line filtration method, this increases the contact area and contact time between the water flow and the filter screen, ensuring that all areas of the filter screen can fully participate in filtration. This avoids filtration leakage caused by dead zones in the local water flow, improving the uniformity and thoroughness of the underfloor heating water filtration. The spiral flow guide device 400 is driven to rotate and scrape dirt by the operating handle 600. This design eliminates the need to disassemble the sealing nut 300 and the filter screen structure 200 to remove dirt, improving the cumbersome problem of traditional Y-type filters requiring disassembly and cleaning. Furthermore, the grinding effect formed during the scraping process can more thoroughly remove stubborn deposits of dirt, preventing increased water flow resistance and decreased underfloor heating circulation efficiency caused by filter screen clogging. This extends the service life of the filter screen structure 200 and the maintenance cycle of the filtration device.

[0021] Example 2 Please see Figures 1-6 The main inlet section 110 is threadedly connected to a venturi tube 500. The venturi tube 500 is coaxially arranged with the main inlet section 110 and is provided with a contraction section 510, a throat 520 and a diffuser section 530 in sequence along the water flow direction.

[0022] In the above embodiment, the underfloor heating water first enters the Venturi tube 500, which is threadedly connected to the port of the main inlet section 110. Since the Venturi tube 500 and the main inlet section 110 are arranged coaxially, the water flows smoothly along its internal flow channel. Along the flow direction, the constriction section of the Venturi tube 500 gradually reduces the flow area, causing the water to form a high-speed flow at the throat 520. Utilizing Bernoulli's principle, the constriction enhances the kinetic energy of the water flow. Then, the high-speed water flow is smoothly transitioned through the diffuser section 530, avoiding turbulence and ensuring that the accelerated water flow is accurately delivered along the axis of the main inlet section 110. The water flow accelerated by the Venturi tube 500 directly... The water flows into the main inlet section 110 and quickly reaches the junction of the main inlet section 110 and the branch pipe section 130, and then enters the filter structure 200. At this time, the high-speed water flow cooperates with the spiral guide component in the filter structure 200. On the one hand, the dynamic flow of the water flow counteracts the flow resistance generated when the spiral guide component guides the water flow to swirl, avoiding the flow velocity reduction caused by the turning and swirling of the water flow. On the other hand, the spiral guide component can still guide the high-speed water flow to form a stable swirling flow along the inner wall of the filter structure 200, so that the water flow can fully contact the filter holes when passing through the filter structure 200, and after completing the interception of impurities, it flows to the main outlet section 120.

[0023] To address the issue of water flow slowdown caused by the flow resistance generated when the spiral flow guide component guides the water flow in a spiral pattern, the Venturi tube 500 accelerates the water flow through the structure of the contraction section, throat 520, and diffuser section 530, replenishes the kinetic energy of the water flow, and offsets the flow resistance effect brought by the spiral flow guide component, so that the water flow velocity in the filter structure 200 is restored to a reasonable range suitable for underfloor heating circulation.

[0024] Example 3 Please see Figures 1-6 The filter structure 200 includes: an annular protrusion 210, located at the intersection of the main inlet section 110 and the branch pipe section 130; an inner filter 230 and an outer filter 240, the outer filter 240 being coaxially sleeved on the outer periphery of the inner filter 230; and a slot 220, formed on the side of the annular protrusion 210 near the outer filter 240, the slot 220 being annular and having a V-shaped cross-section, wherein one end of the outer filter 240 and the inner filter 230 are engaged in the slot 220; the ends of the outer filter 240 and the inner filter 230 away from the annular protrusion 210 abut against the end wall of the sealing nut 300; wherein the filter hole diameter of the outer filter 240 is larger than the filter hole diameter of the inner filter 230.

[0025] In the above embodiment, the annular protrusion 210 located at the intersection of the main inlet section 110 and the branch pipe section 130, and the slot 220 opened on its surface, are used to position and fix the filter screen. One end of the outer filter screen 240 and the inner filter screen 230 are simultaneously locked in the slot 220. The V-shaped cross section of the slot 220 forms a clamping force through the inclined surfaces on both sides to ensure that the end of the filter screen is firmly positioned. The other end of the filter screen away from the annular protrusion 210 abuts against the end wall of the sealing nut 300, forming a two-way fixing structure with one end locked and the other end supported. This avoids direct contact between the filter screen and the inner wall of the branch pipe section 130, eliminating the problem of severe deformation of the filter screen end caused by hard contact between the rear end wall of the filter screen and the inner wall of the pipe in traditional assembly.

[0026] After the underfloor heating water is accelerated by the Venturi pipe 500, it enters the junction of the main inlet section 110 and the branch pipe section 130, and flows into the double-layer filtration structure composed of the outer filter screen 240 and the inner filter screen 230. Since the filter hole diameter of the outer filter screen 240 is larger than that of the inner filter screen 230, the water first passes through the outer filter screen 240 to intercept large particles of impurities, and then passes through the inner filter screen 230 to intercept fine particles of impurities. At the same time, the spiral guide device 400 guides the water flow to swirl along the inner wall of the filter screen, so that the water flows evenly through the multiple filter holes, and after filtration, it flows to the main outlet section 120.

[0027] The outer filter screen 240 and the inner filter screen 230 are installed and positioned through the slot 220. The annular protrusion 210 provides stable radial support to prevent the side walls of the outer filter screen 240 and the inner filter screen 230 from rubbing against the inner wall of the branch pipe section 130. The V-shaped slot 220 fixes the end of the filter screen with the clamping force of the inclined surface. With the sealing nut 300 abutting at the other end, the filter screen is subjected to uniform force, which improves the deformation caused by squeezing and collision during assembly and use, and ensures the integrity of the filter screen structure 200 and the smoothness of the filter flow channel.

[0028] Example 4 Please see Figures 1-6The spiral guide device 400 includes: an extension column 410 disposed at one end of the operating handle 600 near the sealing nut 300; and a spiral blade 420 continuously wound around the outer peripheral wall of the extension column 410 with the axis of the extension column 410 as the center, and the spiral blade 420 is continuously wound around the outer peripheral wall of the extension column 410 along the entire axial length of the extension column 410 without interruption.

[0029] In the above embodiment, the extension column 410 of the spiral guide device 400 is directly located at the end of the operating handle 600 near the sealing nut 300. When the operating handle 600 is rotated, the torque is directly transmitted to the spiral blades 420 through the extension column 410, driving the blades to rotate synchronously. The spiral blades 420 are continuously wound around the outer peripheral wall without interruption along the entire axial length of the extension column 410, forming a complete spiral flow channel. When the local heating water flows into the filter structure 200, the stationary spiral blades 420, through the continuously wound blade shape, force the water flow into a stable swirling flow extending along the inner wall of the filter structure 200, so that the water flow evenly passes through the inner and outer filter screens 240 of the filter structure 200. When cleaning is required, the operating handle 600 is rotated, and the extension column 410 drives the continuous spiral blades 420 to rotate synchronously. The outer periphery of the blades is close to the inner wall of the filter structure 200, forming a continuous scraping effect on the deposited dirt.

[0030] Example 5 Please see Figures 1-6 The sealing nut 300 includes: a nut body 310 with a continuous thread structure evenly distributed on its outer circumference for threaded connection with the inner wall of the end of the branch pipe section 130; wherein a sealing rubber ring is arranged between the nut body 310 and the end wall of the branch pipe section 130; and a mounting hole 320, located on the axis of the nut body 310, for rotatably sealing the connection of the operating handle 600.

[0031] In the above embodiment, the outer circumferential surface of the nut body 310 of the sealing nut 300 is provided with a continuous and evenly distributed thread structure. It is detachably fixed to the inner wall of the end of the branch pipe section 130 through thread engagement. Its end face fits against the end wall of the branch pipe section 130, compressing the sealing ring arranged between them. This causes the sealing ring to undergo elastic deformation and fill the end face gap, forming a reliable static seal structure. This prevents water leakage from the threaded connection gap between the nut body 310 and the branch pipe section 130. An installation hole 320 is opened on the axis of the nut body 310, which is connected to the operating handle. A rotary seal is formed at 600. The seal is achieved through a rotary sealing ring or packing seal provided on the inner wall of the mounting hole 320. Rotary sealing is a conventional technique in this field, so it will not be described in detail here. After the operating handle 600 is installed, it is allowed to rotate freely around its own axis to drive the extension column 410 and the spiral blade 420 of the spiral guide device 400 to rotate, thus achieving self-cleaning. At the same time, the rotary seal structure can prevent water from leaking from the gap between the mounting hole 320 and the operating handle 600, ensuring the sealing integrity of the device during operation.

[0032] Example 6 Please see Figures 1-6 The operating handle 600 includes: a connecting post 610 disposed in the mounting hole 320 and rotatably sealed with the mounting hole 320; wherein one end of the connecting post 610 is coaxially connected to the extension post 410; and a handle body 620, one end of which is connected to the other end of the connecting post 610.

[0033] In the above embodiment, the connecting post 610 of the operating handle 600 is coaxially fitted into the mounting hole 320 of the sealing nut 300, forming a suitable rotational sealing fit. This ensures that the connecting post 610 can rotate flexibly around its own axis while preventing water leakage from the fitting gap. At the same time, one end of the connecting post 610 is coaxially and fixedly connected to the extension post 410 of the spiral guide device 400, so that the rotational torque is transmitted to the extension post 410 without offset through the connecting post 610, thereby driving the spiral blade 420 to rotate synchronously. One end of the handle body 620 is fixedly connected to the other end of the connecting post 610 away from the extension post 410, forming an operating end that is easy to apply force to. By rotating the handle body 620, the connecting post 610 can be easily rotated. By using the lever principle, the force intensity can be reduced, thereby realizing the control of starting to scrape dirt or stopping and locking the spiral blade 420.

[0034] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0035] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A filtration device for underfloor heating pipes, comprising: A Y-shaped conduit (100), and a filter structure (200) arranged within the Y-shaped conduit (100); wherein The Y-shaped pipeline (100) includes a main inlet section (110) and a main outlet section (120) arranged coaxially along a straight line, and a branch pipe section (130) inclinedly connected at the intersection of the main inlet section (110) and the main outlet section (120), and the filter structure (200) is coaxially arranged on the branch pipe section (130). The end of the bifurcation branch section (130) is threaded with a sealing nut (300); The feature is that: a spiral guide device (400) is also provided in the branch pipe section (130), the outer peripheral surface of the spiral guide device (400) is close to the inner wall of the filter structure (200), and the spiral guide device (400) and the filter structure (200) are arranged coaxially; And, an operating handle (600) is rotatably mounted on the end wall of the sealing nut (300), one end of which passes through the sealing nut (300) and connects to the end of the spiral guide device (400); wherein The end of the operating handle (600) near the spiral guide device (400) rotates and seals with the sealing nut (300).

2. The filtration device for underfloor heating pipes according to claim 1, characterized in that, The main inlet section (110) is threadedly connected to a venturi tube (500) at its port. The venturi tube (500) is coaxially arranged with the main inlet section (110) and is provided with a contraction section (510), a throat (520), and a diffuser section (530) in sequence along the water flow direction.

3. The filtration device for underfloor heating pipes according to claim 1, characterized in that, The filter structure (200) includes: An annular protrusion (210) is provided at the junction of the main water inlet section (110) and the branch pipe section (130); An inner filter (230) and an outer filter (240) are provided, wherein the outer filter (240) is coaxially sleeved on the outer periphery of the inner filter (230); A slot (220) is formed on the side of the annular protrusion (210) near the outer filter screen (240). The slot (220) is annular and has a V-shaped cross-section. One end of the outer filter (240) and the inner filter (230) is engaged in the slot (220); The outer filter (240) and the inner filter (230) abut against the end wall of the sealing nut (300) at the ends away from the annular protrusion (210); wherein The diameter of the filter pores of the outer filter (240) is larger than that of the filter pores of the inner filter (230).

4. The filtration device for underfloor heating pipes according to claim 1, characterized in that, The spiral guide device (400) includes: An extension column (410) is provided at one end of the operating handle (600) near the sealing nut (300); The spiral blade (420) is continuous along the outer peripheral wall of the extension column (410). The spiral blade (420) is continuously wound around the outer peripheral wall of the extension column (410) along the entire axial length of the extension column (410) with the axis of the extension column (410) as the center.

5. The filtration device for underfloor heating pipes according to claim 4, characterized in that, The sealing nut (300) includes: The nut body (310) has a continuous thread structure evenly distributed on its outer circumferential surface for threaded connection with the inner wall of the end of the branch pipe section (130); wherein A sealing ring is arranged between the nut body (310) and the end wall of the branch pipe section (130); The mounting hole (320) is located on the axis of the nut body (310) and is used to rotate and seal the operating handle (600).

6. The filtration device for underfloor heating pipes according to claim 5, characterized in that, The operating handle (600) includes: A connecting post (610) is disposed within the mounting hole (320) and rotates and seals with the mounting hole (320); wherein One end of the connecting column (610) is coaxially connected to the extension column (410); One end of the handle body (620) is connected to the other end of the connecting post (610).

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