Water-free floor heating pipeline connecting device
By using the design of locking nuts and ferrules, combined with limiting notches and sealing layers, the welding problem in the connection of waterless underfloor heating pipes is solved, realizing detachable and sealed pipe connections, reducing maintenance costs and improving installation efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU DAYOU AIR CONDITIONING EQUIP CO LTD
- Filing Date
- 2025-06-09
- Publication Date
- 2026-04-14
AI Technical Summary
The existing waterless underfloor heating pipe connection method has high welding process requirements, is prone to welding defects such as false welds and porosity, the connection parts are difficult to disassemble, the maintenance cost is high, and the metal branch pipes are prone to deformation after welding, which affects the heat conduction performance and service life.
The design incorporates a locking nut, ferrule, and tapered sealing surface. The rotation of the nut causes the ferrule to fit tightly against the tapered sealing surface and contract radially, achieving a detachable and sealed connection between the pipeline and the connector. Combined with a limiting notch and sealing layer, leakage is prevented. Copper or stainless steel pipelines are used to accommodate complex laying processes.
It achieves detachable and highly efficient sealing of pipeline connections, reduces maintenance difficulty and cost, improves installation efficiency, reduces the risk of heat transfer medium leakage, and extends pipeline life.
Smart Images
Figure CN224120859U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of waterless underfloor heating pipeline connection technology, and in particular to a waterless underfloor heating pipeline connection device. Background Technology
[0002] Waterless underfloor heating, as a new type of heating method, has been widely used in the field of modern building heating due to its advantages such as high efficiency, energy saving and convenient installation. It abandons the water circulation system of traditional water-based underfloor heating and uses a heat-conducting medium to circulate heat in the pipeline to achieve indoor heating.
[0003] Currently, in waterless underfloor heating pipe connection technology, the common method is to weld metal branch pipes to manifolds. Specifically, high-temperature melting of welding materials ensures a tight fusion at the interface between the metal branch pipe and the manifold, preventing leakage of the heat transfer medium. However, this welding connection method has significant drawbacks. The high temperature during welding can easily cause changes in the properties of the metal material, leading to localized deformation and embrittlement of the metal branch pipe, affecting its thermal conductivity and service life. Furthermore, the welding process requires highly skilled operators; any welding defects such as incomplete welds or porosity directly reduce the sealing performance of the connection, causing leakage of the heat transfer medium. In addition, the welded connection is difficult to disassemble, making repair and replacement extremely inconvenient when the metal branch pipe or manifold malfunctions, requiring the replacement of the entire component and increasing maintenance costs. Therefore, a waterless underfloor heating pipe connection device is urgently needed to solve these problems. Utility Model Content
[0004] To overcome the shortcomings of the existing technology, this utility model provides a waterless underfloor heating pipe connection device, which solves the technical problems of high welding process requirements, easy occurrence of welding defects such as false welding and porosity, and difficulty in disassembling the connection parts and high maintenance costs in the existing waterless underfloor heating pipe connection methods.
[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:
[0006] A waterless underfloor heating pipe connection device is used to connect the pipes in a waterless underfloor heating system. The pipes include: a main metal pipe and capillary metal pipes.
[0007] A connecting seat, which is rectangular in shape, has a flow channel inside, which extends along the length of the connecting seat. The connecting seat has an interface, which includes a first interface and a set of second interfaces. The set of second interfaces is evenly spaced along the length of the connecting seat. Both the first interface and the set of second interfaces are connected to the flow channel. The first interface and the second interface are used to insert a metal main tube and a capillary metal tube, respectively.
[0008] A connecting assembly is provided at the connection between the pipeline and the connecting seat. The connecting assembly is used to connect the pipeline to the seal. The connecting assembly includes: a ferrule, which is provided inside the interface. The inner wall of the interface is provided with a conical sealing surface. The ferrule is fitted onto the pipeline. The ferrule is provided with an inclined surface corresponding to the conical sealing surface.
[0009] A locking nut is fitted onto the pipeline on the side away from the connector, the locking nut is located inside the interface, and the locking nut is threadedly connected to the connector.
[0010] Based on the above structure, the principle of the waterless underfloor heating pipe connection device is as follows: the flow channel provides a passage for the heat-conducting medium in the waterless underfloor heating; the first interface and the second interface are respectively used to connect the main metal pipe and the capillary metal pipe to the connecting seat, realizing the distribution and transmission of the heat-conducting medium in the entire waterless underfloor heating; before inserting the pipe into the interface, the locking nut and the ferrule adapted to the pipe are first put on the pipe in sequence, at this time the locking nut and the ferrule are in a free state on the pipe; then, the pipe with the ferrule and the locking nut are inserted into the corresponding interface on the connecting seat; then, the locking nut is rotated. Since the locking nut is threadedly connected to the connecting seat, as the locking nut rotates, it will gradually move towards the connecting seat. Since the inner wall of the interface is provided with a conical sealing surface, and the ferrule is provided with an inclined surface corresponding to the conical sealing surface, when the locking nut moves towards the connecting seat... When the connector moves, it pushes the ferrule inwards. As the ferrule moves inwards, its inclined surface gradually comes into contact with the conical sealing surface of the inner wall of the interface. As the locking nut tightens, the ferrule is subjected to axial pressure from the pipeline, making the fit between the inclined surface of the ferrule and the conical sealing surface even tighter. During this process, the ferrule also undergoes radial contraction deformation, tightly gripping the pipeline and sealing it to prevent leakage of the heat transfer medium from the connection. The pipeline and the connector are detachably sealed together via the connecting assembly. This design allows operators to easily remove the problematic pipeline from the connector for repair or replacement when problems occur at the connection points of the pipeline in the underfloor heating system, without the need for complete replacement. This improves maintenance efficiency, reduces labor costs and repair time, and effectively lowers the overall maintenance cost of waterless underfloor heating.
[0011] Furthermore, in this application, a waterless underfloor heating pipe connection device includes a limiting notch within the interface. The limiting notch is arranged circumferentially around the interface, and when the pipe is inserted into the interface, the end of the pipe near the connector abuts against the limiting notch. As a preferred embodiment of this application, the limiting notch and the pipe end work together to ensure consistent pipe insertion position, preventing poor sealing due to pipe position deviation, and preventing damage to internal components of the connector caused by over-insertion of the pipe, thus ensuring the normal operation of the waterless underfloor heating system. Simultaneously, during installation, operators can determine whether the pipe has been inserted into the appropriate position by observing the contact between the pipe end and the limiting notch, reducing installation difficulty and improving installation efficiency.
[0012] Furthermore, in a waterless underfloor heating pipe connection device of this application, the first interface is axially connected to the flow channel, and the outer wall of the connecting seat is provided with a hollow threaded head. The hollow threaded head is located outside the first interface, and the locking nut is screwed onto the hollow threaded head. As a preferred embodiment of this application, the waterless underfloor heating pipe connection device of this application, with the first interface axially connected to the flow channel, ensures smooth flow of the heat transfer medium between the pipe and the connecting seat, reducing flow resistance and energy loss; the combined use of the hollow threaded head and the locking nut tightly connects the pipe and the connecting seat together. When the locking nut is screwed onto the hollow threaded head, axial pressure is generated, causing the ferrule to be tightly pressed between the pipe and the connecting seat, achieving a sealing effect and preventing leakage of the heat transfer medium.
[0013] Furthermore, in a waterless underfloor heating pipe connection device of this application, a protective layer is provided on the outer wall of the capillary metal tube. As a preferred embodiment of this application, the protective layer in this waterless underfloor heating pipe connection device can prevent the capillary metal tube from being subjected to friction and collision during the installation of waterless underfloor heating, reduce pipe wall wear caused by friction, and avoid problems such as pipe wall thinning and cracking; in addition, the protective layer can reduce heat exchange between the heat-conducting medium inside the capillary metal tube and the external environment, improve the thermal efficiency of waterless underfloor heating, and reduce energy loss.
[0014] Furthermore, in a waterless underfloor heating pipe connection device of this application, a sealing layer is provided at the threaded connection between the locking nut and the connecting seat, and the sealing layer is arranged circumferentially along the locking nut. As a preferred embodiment of this application, the sealing layer of the waterless underfloor heating pipe connection device can fill the tiny gap between the threads of the locking nut and the connecting seat, preventing the heat transfer medium from leaking from the threaded connection and ensuring the normal operation of the waterless underfloor heating.
[0015] Furthermore, in the waterless underfloor heating pipe connection device of this application, both the main metal pipe and the capillary metal pipe are made of copper or stainless steel. As a preferred embodiment of this application, the copper or stainless steel material of the waterless underfloor heating pipe connection device has good corrosion resistance, is suitable for various environments, can extend the service life of the pipe, and reduce maintenance costs; both materials possess a certain degree of plasticity and ductility, are easy to process and shape, and can be processed into pipes of different shapes and specifications according to the installation requirements of waterless underfloor heating, adapting to complex laying environments.
[0016] Furthermore, in this application, a waterless underfloor heating pipe connection device is provided, wherein the clamping sleeve is made of copper. As a preferred embodiment of this application, copper has a certain degree of ductility, allowing the copper clamping sleeve to deform appropriately under the action of the locking nut, tightly fitting against the conical sealing surface of the pipe and the connecting seat, filling tiny gaps, achieving a sealing effect, and preventing leakage of the heat transfer medium in the waterless underfloor heating system.
[0017] As can be seen from the above technical solution, this utility model has the following beneficial effects:
[0018] The purpose of this invention is to provide a waterless underfloor heating pipe connection device. Through the axial compression synergy of the locking nut, the conical sealing surface, and the ferrule, when the locking nut is tightened, the ferrule not only fits tightly with the conical sealing surface on its inclined surface, but also contracts and deforms radially to tightly hold the pipe, achieving a double sealing effect. At the same time, the sealing layer set at the threaded connection between the locking nut and the connector further prevents the heat transfer medium from leaking from the thread gaps, improving the sealing performance of the connection. When connecting the pipe to the connector, simply put the locking nut and ferrule on the pipe, insert it into the interface, and tighten the locking nut to complete the connection. When disassembling, simply twist the locking nut in the opposite direction to remove the pipe from the connector. No complicated welding operations or professional tools are required, greatly reducing the difficulty of installation and maintenance and significantly improving work efficiency. Attached Figure Description
[0019] Figure 1 This is a three-dimensional structural schematic diagram of a waterless underfloor heating pipe connection device according to an embodiment of this application;
[0020] Figure 2 This is a cross-sectional view of a waterless underfloor heating pipe connection device according to an embodiment of this application;
[0021] Figure 3 for Figure 2 A magnified view of a portion of area A in the middle circle.
[0022] In the diagram: 1-pipeline; 11-main metal tube; 12-capillary metal tube; 2-connector; 20-flow channel; 21-first interface; 22-second interface; 23-hollow threaded head; 3-connecting assembly; 31-ferrule; 311-bevel; 32-locking nut; 4-conical sealing surface; 5-limiting notch; 6-protective layer; 7-sealing layer. Detailed Implementation
[0023] like Figure 1 , 2 As shown in Figure 3, a waterless underfloor heating pipe connection device is used to connect pipes 1 in a waterless underfloor heating system. Pipe 1 includes: a main metal pipe 11 and a capillary metal pipe 12, comprising:
[0024] Connecting seat 2, which is rectangular in shape, has a flow channel 20 inside, which extends along the length of the connecting seat 2. The connecting seat 2 is provided with an interface, which includes a first interface 21 and a set of second interfaces 22. The set of second interfaces 22 are evenly spaced along the length of the connecting seat 2. Both the first interface 21 and the set of second interfaces 22 are connected to the flow channel 20. The first interface 21 and the second interface 22 are respectively used to insert the main metal tube 11 and the capillary metal tube 12.
[0025] A connecting component 3 is provided at the connection between the pipeline 1 and the connecting seat 2. The connecting component 3 is used to connect the pipeline 1 to the seal. The connecting component 3 includes: a retainer 31, which is provided inside the interface. The inner wall of the interface is provided with a conical sealing surface 4. The retainer 31 is sleeved on the pipeline 1. The retainer 31 is provided with an inclined surface 311 corresponding to the conical sealing surface 4.
[0026] A locking nut 32 is fitted onto the pipeline 1 on the side away from the connector 2. The locking nut 32 is located inside the interface and is threadedly connected to the connector 2.
[0027] Based on the above structure, the principle of the waterless underfloor heating pipe connection device is as follows: the flow channel 20 provides a channel for the flow of the heat-conducting medium in the waterless underfloor heating; the first interface 21 and the second interface 22 are respectively used to connect the main metal pipe 11 and the capillary metal pipe 12 to the connecting seat 2, realizing the distribution and transmission of the heat-conducting medium in the entire waterless underfloor heating; before inserting the pipe 1 into the interface, the locking nut 32 and the clamping sleeve 31 adapted to the pipe 1 are first sequentially fitted onto the pipe 1, at which time the locking nut 32 and the clamping sleeve 31 are in a free state on the pipe 1; then, the pipe 1 fitted with the clamping sleeve 31 and the locking nut 32 is inserted into the corresponding interface on the connecting seat 2; then, the locking nut 32 is rotated. Since the locking nut 32 is threadedly connected to the connecting seat 2, as the locking nut 32 rotates, the locking nut 32 will gradually move towards the connecting seat 2. Since the inner wall of the interface is provided with a conical sealing surface 4, and the clamping sleeve 31 is provided with an inclined surface 311 corresponding to the conical sealing surface 4, When the locking nut 32 moves closer to the connector 2, it pushes the ferrule 31 into the interface. As the ferrule 31 moves into the interface, its inclined surface 311 gradually comes into contact with the conical sealing surface 4 of the inner wall of the interface. As the locking nut 32 tightens, the ferrule 31 is subjected to axial pressure from the pipeline 1, making the fit between the inclined surface 311 and the conical sealing surface 4 even tighter. During this process, the ferrule 31 also undergoes radial shrinkage deformation, tightly holding the pipeline 1 to achieve a seal on the pipeline 1 and prevent the heat transfer medium from leaking from the connection. The pipeline 1 and the connector 2 are detachably sealed together by the connecting component 3. This design makes it convenient for operators to remove the problematic pipeline 1 from the connector 2 for repair or replacement when there is a problem with the connection of the pipeline 1 in the underfloor heating system, without the need for complete replacement. This improves maintenance efficiency, reduces labor costs and maintenance time, and effectively reduces the overall maintenance cost of waterless underfloor heating. The number of second interfaces 22 is 12, and correspondingly, the number of capillary metal tubes 12 is also 12; the two ends of the sleeve 31 near the locking nut 32 and the connecting seat 2 are respectively provided with inclined surfaces 311, and the side of the locking nut 32 near the sleeve 31 is provided with a conical sealing surface 4 corresponding to the inclined surface 311.
[0028] In this embodiment, the interface is provided with a limiting notch 5, which is arranged circumferentially around the interface. When the pipeline 1 is inserted into the interface, the end of the pipeline 1 near the connector 2 abuts against the limiting notch 5. The limiting notch 5 and the end of the pipeline 1 work together to ensure the consistency of the position of the pipeline 1 when inserted into the interface, avoid poor sealing caused by deviation of the pipeline 1 position, prevent damage to the internal components of the connector 2 caused by over-insertion of the pipeline 1 into the interface, and ensure the normal operation of the waterless underfloor heating. At the same time, during the installation process, the operator can judge whether the pipeline 1 has been inserted into the appropriate position by observing the contact between the end of the pipeline 1 and the limiting notch 5, which reduces the installation difficulty and improves the installation efficiency.
[0029] In this embodiment, the first interface 21 is axially connected to the flow channel 20, and the outer wall of the connecting seat 2 is provided with a hollow threaded head 23. The hollow threaded head 23 is located on the outside of the first interface 21, and the locking nut 32 is screwed onto the hollow threaded head 23. The axial connection between the first interface 21 and the flow channel 20 ensures that the heat transfer medium can flow smoothly between the pipeline 1 and the connecting seat 2, reducing flow resistance and energy loss. The cooperation of the hollow threaded head 23 and the locking nut 32 tightly connects the pipeline 1 and the connecting seat 2 together. When the locking nut 32 is screwed onto the hollow threaded head 23, axial pressure is generated, causing the ferrule 31 to be tightly pressed between the pipeline 1 and the connecting seat 2, achieving a sealing effect and preventing leakage of the heat transfer medium.
[0030] In this embodiment, a protective layer 6 is provided on the outer wall of the capillary metal tube 12. During the installation of the waterless underfloor heating system, the protective layer 6 prevents the capillary metal tube 12 from being subjected to friction and collision, reducing wear on the tube wall caused by friction and preventing problems such as thinning and cracking of the tube wall. Furthermore, the protective layer 6 can reduce heat exchange between the heat-conducting medium inside the capillary metal tube 12 and the external environment, improving the thermal efficiency of the waterless underfloor heating system and reducing energy loss. The protective layer 6 is made of plastic.
[0031] In this embodiment, a sealing layer 7 is provided at the threaded connection between the locking nut 32 and the connecting seat 2, and the sealing layer 7 is arranged circumferentially along the locking nut 32. The sealing layer 7 can fill the tiny gap between the threads of the locking nut 32 and the connecting seat 2, preventing the heat transfer medium from leaking from the threaded connection and ensuring the normal operation of the waterless underfloor heating. The sealing layer 7 is made of PTFE tape.
[0032] In this embodiment, both the main metal pipe 11 and the capillary metal pipe 12 are made of copper or stainless steel. Copper or stainless steel materials have good corrosion resistance, are suitable for various environments, can extend the service life of the pipeline 1, and reduce maintenance costs; both have a certain degree of plasticity and ductility, are easy to process and shape, and can be processed into pipes of different shapes and specifications according to the installation requirements of waterless underfloor heating, adapting to complex laying environments.
[0033] In this embodiment, the sleeve 31 is made of copper. Copper has a certain degree of ductility, and under the action of the locking nut 32, the copper sleeve 31 can undergo appropriate deformation, tightly fitting onto the conical sealing surface 4 of the pipeline 1 and the connecting seat 2, filling the tiny gaps, achieving a sealing effect, and preventing leakage of the heat transfer medium in waterless underfloor heating.
[0034] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on the explanation herein, those skilled in the art can conceive of other specific embodiments of this utility model without creative effort, and these embodiments will all fall within the scope of protection of this utility model.
Claims
1. A waterless underfloor heating pipe connection device for connecting pipes (1) in a waterless underfloor heating system, wherein the pipes (1) include: Metal main tube (11) and capillary metal tube (12), characterized in that: they include: A connecting seat (2) is rectangular in shape. A flow channel (20) is provided inside the connecting seat (2). The flow channel (20) extends along the length direction of the connecting seat (2). An interface is provided on the connecting seat (2). The interface includes a first interface (21) and a set of second interfaces (22). The set of second interfaces (22) is evenly spaced along the length direction of the connecting seat (2). The first interface (21) and the set of second interfaces (22) are both connected to the flow channel (20). The first interface (21) and the second interface (22) are respectively used to insert a metal main tube (11) and a capillary metal tube (12). A connecting component (3) is provided at the connection between the pipeline (1) and the connecting seat (2). The connecting component (3) is used to seal the connection between the pipeline (1) and the connecting seat (2). The connecting component (3) includes: a retainer (31), which is provided inside the interface. The inner wall of the interface is provided with a conical sealing surface (4). The retainer (31) is fitted onto the pipeline (1). The retainer (31) is provided with an inclined surface (311) corresponding to the conical sealing surface (4). Locking nut (32) is sleeved on the pipeline (1) on the side away from the connecting seat (2). The locking nut (32) is located inside the interface and is threadedly connected to the connecting seat (2).
2. The waterless underfloor heating pipe connection device according to claim 1, characterized in that: The interface is provided with a limiting notch (5), which is arranged along the circumference of the interface. When the pipeline (1) is inserted into the interface, the end of the pipeline (1) near the connector (2) abuts against the limiting notch (5).
3. The waterless underfloor heating pipe connection device according to claim 2, characterized in that: The first interface (21) is axially connected to the flow channel (20). The outer wall of the connecting seat (2) is provided with a hollow thread head (23). The hollow thread head (23) is located on the outside of the first interface (21). The locking nut (32) is screwed onto the hollow thread head (23).
4. The waterless underfloor heating pipe connection device according to claim 1, characterized in that: The outer wall of the capillary metal tube (12) is covered with a protective layer (6).
5. The waterless underfloor heating pipe connection device according to claim 1, characterized in that: A sealing layer (7) is provided at the threaded connection between the locking nut (32) and the connecting seat (2), and the sealing layer (7) is arranged circumferentially along the locking nut (32).
6. The waterless underfloor heating pipe connection device according to claim 4, characterized in that: The main metal tube (11) and the capillary metal tube (12) are both made of copper or stainless steel.
7. The waterless underfloor heating pipe connection device according to claim 1, characterized in that: The card sleeve (31) is made of copper.