Pipe-in-pipe water return device

Abstract

The utility model discloses a pipe-in-pipe water return device which comprises a pipe body, a partition plate, a conversion valve and a connecting piece. The pipe body comprises an L-shaped pipe body and a straight pipe body, the L-shaped pipe body and the straight pipe body are divided into an input cavity and a backflow cavity by the partition plate, and the outer wall of the L-shaped pipe body and the outer wall of the straight pipe body are coated with thermochromic coating; the connecting piece comprises a pipe body connecting piece and an adaptive connecting piece, the L-shaped pipe body is communicated with the straight pipe body through the pipe body connecting piece, one side of the straight pipe body is connected with the adaptive connecting piece, and the other side of the L-shaped pipe body is connected with the conversion valve; the conversion valve is located at the first end, away from the straight pipe body, of the L-shaped pipe body and comprises a valve body, a valve element and a flow turning ring. The adaptive connecting piece comprises an adaptive connecting plate, an adaptive upper bottom surface and an adaptive lower bottom surface; adaptive left through holes corresponding to the input cavity and the backflow cavity respectively are formed in the adaptive lower bottom surface; and the straight pipe body middle partition plate is clamped to the adaptive connecting plate. According to the utility model, the additional laying design and construction of the water return pipeline can be reduced, and the design workload and laying workload are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pipe fittings, more particularly to a pipe-in-pipe backwater device. BACKGROUND

[0002] The backwater pipe, also known as a backwater device, is a pipe section that only circulates water in a hot water circulation system. In a centralized hot water supply system for a single building, a hot water backwater pipe and a circulating water pump are needed to ensure the circulation of hot water in the main pipe and the vertical pipe. When hot water is supplied, there are two pipe routes from the water supply point to the outlet, one being the hot water supply pipe and the other being the backwater pipe. The hot water in the hot water supply pipe will cool down after a certain interval, and to ensure that hot water is available at the outlet within a short period of time, the water pump will automatically pump back the cooled water from the backwater pipe for reheating. The existing backwater is a new installation method, which is different from the old installation method. It requires the hot water pipe to be diverted to the hot water faucet and then bent back to the water heater. A check valve is usually installed at the end of the backwater pipe to connect to the cold water pipe, which directly pumps the cold water in the hot water pipe back to the cold water pipe, allowing the hot water to flow back through this ring-shaped pipe, thereby achieving the effect of having hot water as soon as the faucet is opened. The backwater pipe requires additional pipe design and construction, which is complicated to operate and install.

[0003] Chinese patent application file 1 (application number: 2020114061595, application date: 2020.12.02) discloses a double-channel switching type double-wall corrugated pipe, which includes two pipe bodies 1', the inner surfaces of the two pipe bodies 1' are provided with inner walls 2', the outer surfaces of the two pipe bodies 1' are provided with outer walls 3', a plurality of fixed partitions 4' are fixedly installed between the upper and lower ends of the inner walls 2' of the two pipe bodies 1', a plurality of movable partitions 5' are movably connected between the fixed partitions 4', the sizes of the plurality of movable partitions 5' are the same as those of the fixed partitions 4', a plurality of movable grooves are formed in the right ends of the fixed partitions 4', and a connecting shaft 6' is rotatably connected between the left inner wall 2' and the movable partition 5' of each movable groove. The above-mentioned scheme flips the fixed partition 4' to realize the flow between the two channels, and only single-direction flow can be achieved, and water cannot be bidirectionally transported.

[0004] Chinese patent application file 2 (application number: 2018108036315, application date: 2018.07.20) discloses a double-channel red copper pipe body. It relates to the technical field of pipe fittings. The pipe body is uniformly provided with first and second convex edges on the circumferential surface; a partition is installed inside the pipe body; the two sides of the partition are respectively installed in the first and second convex edges; and the pipe body is uniformly distributed between two fixed frames. The above-mentioned scheme only installs a partition inside the pipe body to increase its heat dissipation capacity, but it cannot be applied to bidirectional water transportation.

[0005] Therefore, providing a pipe-in-pipe return water device that eliminates the need for additional pipeline design (such as return pipes) and construction, and further enables bidirectional transport of water flowing in the pipe and allows for free control of water return is an urgent technical problem to be solved. Utility Model Content

[0006] In view of this, the present invention provides a pipe-in-pipe water return device to solve the problems of pipeline design in the water return process and the problem of freely controlling water return.

[0007] This application provides a pipe-in-pipe return water device, comprising: a pipe body, a baffle plate, a diverting valve, and a connector, wherein,

[0008] The tube body includes an L-shaped tube body and a straight tube body connected to the L-shaped tube body. The L-shaped tube body is an L-shaped hollow cylinder, and the straight tube body is a straight hollow cylinder. The L-shaped tube body and the straight tube body are respectively provided with partitions. The partitions are rectangular plates. The partitions in the L-shaped tube body are arranged horizontally along the direction of the L-shaped hollow cylinder, and the partitions in the straight tube body are arranged horizontally along the axis of the straight hollow cylinder. The partitions divide the L-shaped tube body and the straight tube body into an upper and lower parallel inlet chamber and a return chamber. The outer wall of the L-shaped tube body away from the straight tube body is coated with a thermochromic coating.

[0009] The directional valve is located at the first end of the L-shaped pipe body furthest from the straight pipe body, and includes a valve body, a valve core, and a flow ring.

[0010] The valve body includes a lower valve body and an upper valve body connected to the lower valve body. The lower valve body is located on the side of the upper valve body closer to the L-shaped tube. The lower valve body has a hollow annular structure, and its inner wall surrounds the outer surface of the L-shaped tube on the side away from the straight tube. The upper valve body has a hollow frustum structure, with the bottom surface of the hollow frustum structure facing the lower valve body. The upper valve body has a parallel and interconnected inlet and outlet, with the inlet corresponding to the inlet cavity and the return cavity.

[0011] The valve core, located inside the upper valve body, is a hemisphere. The surface of the hemisphere near the first end is concave, and the concave surface is recessed on the side away from the first end.

[0012] The swivel ring includes a hand grip ring and a connecting rod connected to the hand grip ring. The hand grip ring is disc-shaped, and the connecting rod is cylindrical. The hand grip ring and the connecting rod form a T-shaped structure. The connecting rod passes through the upper valve body and is fixedly connected to the valve core.

[0013] The connector includes a tube body connector and an adapter connector. The tube body connector is a hollow cylinder, and the adapter connector is a frustum structure. The L-shaped tube body and the straight tube body are connected through the tube body connector. The adapter connector is connected to the side of the straight tube body away from the L-shaped tube body.

[0014] The pipe body connector includes a pipe body connecting ring, a pipe body connecting plate, and a pipe body flange ring. There are two pipe body connecting rings. The head and tail ends of the pipe body connecting rings are connected to the L-shaped pipe body and the straight pipe body respectively through the pipe body connecting rings. The pipe body connecting plate is placed inside the pipe body connecting ring.

[0015] The adapter connector is a hollow frustum structure, which includes a parallel upper and lower bottom surface. An adapter connecting plate is provided between the upper and lower bottom surfaces. The upper bottom surface surrounds the straight tube body on the side away from the L-shaped tube body. A left through hole is provided on the lower bottom surface of the adapter, which extends along the length of the straight tube body and penetrates the lower bottom surface. There are two left through holes, which correspond to the input cavity and the return cavity, respectively. The middle partition of the straight tube body on the side away from the L-shaped tube body is snapped onto the adapter connecting plate on the side closer to the straight tube body.

[0016] Compared with the prior art, the pipe-in-pipe water return device provided by this utility model achieves at least the following beneficial effects:

[0017] First, the pipe-in-pipe return water device provided by this utility model can reduce the additional design and construction of return water pipelines, thus reducing the design and laying workload. For example, through a pipe-in-pipe design, this utility model allows hot water delivery and cold water return to occur in one pipe. When hot water is being delivered, cold water can return to the heating equipment along the same pipeline design. Furthermore, the straight and L-shaped pipe bodies provided by this utility model allow the pipe-in-pipe return water device to be applied to different house types, meeting specific design and usage needs.

[0018] Secondly, the pipe-in-pipe water return device provided by this utility model can transport water flowing in the pipe in both directions, avoiding the waste of water stagnant in the pipe. Especially in some longer hot water pipelines, the water stagnant in the pipe is often large in volume. Using the pipe-in-pipe water return device provided by this utility model can greatly save water resources. Furthermore, the cold water stagnant in the pipe is often hotter than the room temperature cold water. The stagnant cold water can be returned through the same pipeline, sharing the insulation material outside the water supply pipe. It can also be connected to the inlet pipe of the heating equipment near the heating equipment, which can reduce the heat loss of the stagnant water and allow the stagnant water to be heated again by the heating equipment more quickly.

[0019] Third, the pipe-in-pipe water return device provided by this utility model allows for precise and free control of water return. For example, the thermochromic coating provided by this utility model monitors the temperature changes of the water in the inlet and outlet chambers near the faucet in real time. This monitoring is real-time and intuitive, avoiding long-term backflow and the energy waste caused by hot water backflow. At the same time, the diverting valve provided by this utility model can accurately perform diversion operation based on the heat and temperature information fed back by the thermochromic coating. The operation is simple and quick, meeting the need for rapid hot water output.

[0020] Of course, any product implementing this utility model does not necessarily need to achieve all the technical effects described above at the same time.

[0021] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0023] Figure 1 This is a schematic diagram of a dual-channel switching double-wall corrugated pipe disclosed in Chinese patent application document 1;

[0024] Figure 2 This is a schematic diagram of the pipe-in-pipe water return device provided by this utility model;

[0025] Figure 3 yes Figure 2 A-A' section view in the diagram;

[0026] Figure 4 This is a structural schematic diagram of the straight tube body provided by this utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the L-shaped tube provided by this utility model;

[0028] Figure 6 yes Figure 5 Section B-B' in the diagram;

[0029] Figure 7 This is an exploded view of the steering valve provided by this utility model;

[0030] Figure 8 This is a structural schematic diagram of the pipe connector provided by this utility model;

[0031] Figure 9 yes Figure 8 Enlarged view of point C in the image;

[0032] Figure 10 This is a schematic diagram of the structure of the adapter connector provided by this utility model in one direction;

[0033] Figure 11 This is a structural schematic diagram of the adapter connector provided by this utility model from another direction;

[0034] Figure 12 This is a diagram showing the usage state of the valve core, flow ring, baffle, and part of the L-shaped pipe body provided by this utility model. Detailed Implementation

[0035] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0036] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0037] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0038] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0040] Example 1

[0041] Reference Figures 2-11 As shown, Figure 2 This is a schematic diagram of the pipe-in-pipe water return device provided by this utility model; Figure 3 yes Figure 2 A-A' section view in the diagram; Figure 4 This is a structural schematic diagram of the straight tube body provided by this utility model; Figure 5 This is a schematic diagram of the structure of the L-shaped tube provided by this utility model; Figure 6 yes Figure 5 Section B-B' in the diagram; Figure 7 This is an exploded view of the steering valve provided by this utility model; Figure 8 This is a structural schematic diagram of the pipe connector provided by this utility model; Figure 9 yes Figure 8 Enlarged view of point C in the image;Figure 10 This is a schematic diagram of the structure of the adapter connector provided by this utility model in one direction; Figure 11 This is a structural schematic diagram of the adapter connector provided by this utility model from another direction; Figure 12 This is a diagram showing the usage state of the valve core, flow ring, baffle, and part of the L-shaped pipe body provided by this utility model.

[0042] This embodiment provides a pipe-in-pipe water return device, including: a pipe body 2, a baffle 3, a diverting valve 1, and a connector 4, wherein,

[0043] The tube body 2 includes an L-shaped tube body 22 and a straight tube body 21 connected to the L-shaped tube body 22. The L-shaped tube body 22 is an L-shaped hollow cylinder, and the straight tube body 21 is a straight hollow cylinder. A partition 3 is provided inside the L-shaped tube body 22 and the straight tube body 21. The partition 3 is a rectangular plate. The partition 3 inside the L-shaped tube body 22 is arranged horizontally along the direction of the L-shaped hollow cylinder, and the partition 3 inside the straight tube body 21 is arranged horizontally along the axis of the straight hollow cylinder. The partition 3 divides the L-shaped tube body 22 and the straight tube body 21 into an upper and lower parallel input cavity 231 and a return cavity 232. The outer wall of the L-shaped tube body 22 away from the straight tube body 21 is coated with a thermochromic coating 233.

[0044] The directional valve 1 is located at the first end of the L-shaped pipe body 22 away from the straight pipe body 21, and includes a valve body 11, a valve core 12, and a flow ring 13.

[0045] The valve body 11 includes a lower valve body 111 and an upper valve body 112 connected to the lower valve body 111. The lower valve body 111 is located on the side of the upper valve body 112 closer to the L-shaped tube 22. The lower valve body 111 has a hollow annular structure, and the inner wall of the lower valve body 111 surrounds the outer surface of the L-shaped tube 22 on the side away from the straight tube 21. The upper valve body 112 has a hollow frustum structure, and the bottom surface of the hollow frustum structure faces the lower valve body 111. The upper valve body 112 has a parallel and connected inlet and outlet, and the inlet corresponds to the inlet cavity 231 and the return cavity 232.

[0046] The valve core 12 is located inside the upper valve body 112. It is a hemisphere. The surface of the hemisphere near the first end is a concave surface 10. The concave surface 10 is recessed to the side away from the first end.

[0047] The swivel ring 13 includes a hand grip ring 131 and a connecting rod 132 connected to the hand grip ring 131. The hand grip ring 131 is disc-shaped and the connecting rod 132 is cylindrical. The hand grip ring 131 and the connecting rod 132 form a T-shaped structure. The connecting rod 132 passes through the upper valve body 112 and is fixedly connected to the valve core 12.

[0048] The connector 4 includes a tube body connector 41 and an adapter connector 42. The tube body connector 41 is a hollow cylinder, and the adapter connector 42 is a frustum structure. The L-shaped tube body 22 and the straight tube body 21 are connected through the tube body connector 41. The side of the straight tube body 21 away from the L-shaped tube body 22 is connected to the adapter connector 42.

[0049] The pipe body connector 41 includes a pipe body connecting ring 413, a pipe body connecting plate 411, and a pipe body flange ring 412. The pipe body flange ring 412 and the pipe body connecting ring 413 are two in number. The head and tail ends of the pipe body connecting ring 413 are connected to the L-shaped pipe body 22 and the straight pipe body 21 respectively through the pipe body connecting ring 413. The pipe body connecting plate 411 is placed inside the pipe body connecting ring 413.

[0050] The adapter connector 42 is a hollow frustum structure, which includes a parallel upper adapter surface 42R and a lower adapter surface 42L. An adapter connecting plate 421 is provided between the upper adapter surface 42R and the lower adapter surface 42L. The upper adapter surface 42R surrounds the straight tube body 21 on the side away from the L-shaped tube body 22. An adapter left through hole 423 is provided on the lower adapter surface 42L. The adapter left through hole 423 extends through the lower adapter surface 42L along the length direction of the straight tube body 21. There are two adapter left through holes 423, which correspond to the input cavity 231 and the return cavity 232, respectively. The partition plate 3 of the straight tube body 21 on the side away from the L-shaped tube body 22 is snapped onto the adapter connecting plate 421 on the side close to the straight tube body 21.

[0051] Specifically, continue to refer to Figures 2-6 As shown, both the straight pipe body 21 and the L-shaped pipe body 22 are hollow round pipes of uniform thickness. The materials of the straight pipe body 21 and the L-shaped pipe body 22 can be plastic, metal, or a composite pipe made of plastic and metal. The straight pipe body 21 and the L-shaped pipe body 22 can be provided with various pipe diameters, and the outer wall radius can be 25mm, 32mm, 40mm, or 50mm, etc., so that the straight pipe body 21 and the L-shaped pipe body 22 can adapt to various construction needs. The outer wall radius of the straight pipe body 21 and the L-shaped pipe body 22 provided in this embodiment is 32mm, and the wall thickness is 2.8mm to 4.0mm. Both ends of the straight pipe body 21 and the L-shaped pipe body 22 are provided with external pipe threads 203. Through the external pipe threads 203, the straight pipe body 21 and the L-shaped pipe body 22 can be connected to the diverting valve 1 or the adapter connector 42. The straight pipe body 21 and the L-shaped pipe body 22 can also be connected to each other through the pipe body connector 41. The straight pipe 21 is a linear straight pipe with uniform thickness, and the L-shaped pipe 22 is a branch pipe with an L-shaped bend. By superimposing and cooperating the straight pipe 21 and the L-shaped pipe 22, this embodiment can be used to lay pipes for different types of houses.

[0052] The input chamber 231 and return chamber 232 inside the straight tube 21 or L-shaped tube 22 are both semi-cylindrical channels. The input chamber 231 and return chamber 232 are arranged symmetrically, with the partition 3 as their symmetrical plane. The cross-section of the input chamber 231 and return chamber 232 perpendicular to their length direction is semi-circular, and the cross-sectional size of the input chamber 231 and return chamber 232 is equal. The end of the return chamber 232 and the input chamber 231 near the diverting valve 1 are both connected to the diverting valve 1. The return chamber 232 and the input chamber 231 are both connected to the input port of the diverting valve 1. The return chamber 232 and the input chamber 231 are interconnected through the input port of the diverting valve 1. Liquid (such as water) can enter the diverting valve 1 through the input chamber 231 and flow into the return chamber 232 in the valve body 11.

[0053] The outer wall of the L-shaped tube 22 away from the straight tube 21 is coated with a thermochromic coating 233. The thermochromic coating 233 is a coating that changes color with temperature. The thermochromic coating 233 contains special chemical substances that undergo chemical reactions or physical changes at specific temperatures, resulting in a visually observable color change in the thermochromic coating 233. Thermochromic coating 233 is specifically applied to the end of the L-shaped pipe 22 near the diverting valve 1. The thermochromic coating 233 is a reversible hot chromium coating. In this embodiment, the color change temperature range of the reversible hot chromium coating is set between -15℃ and 70℃. Along the circumference of the L-shaped pipe 22, and in the direction from the diverting valve 1 to the L-shaped pipe 22, the application width of the thermochromic coating 233 is greater than or equal to 10mm. The reversible hot chromium coating may be different colors and color change ranges, depending on the selection of chromium, coating composition, and process. Through the color change of the thermochromic coating 233, the user can understand the real-time temperature of the water at the end of the L-shaped pipe 22 near the diverting valve.

[0054] The shape of the baffle 3 matches the shape of the straight pipe 21 and the L-shaped pipe 22. The width of the baffle 3 is the same as the inner diameter of the straight pipe 21 and the L-shaped pipe 22. The length of the baffle 3 is the same as the length of the return chamber 232. The baffle 3 is fixedly connected inside the straight pipe 21 and the L-shaped pipe 22, dividing the inside of the straight pipe 21 and the L-shaped pipe 22 into two chambers, such as the input chamber 231 and the return chamber 232. When the user drains the cold water in the input chamber 231, the cold water in the input chamber 231 flows back into the return chamber 232 in the valve body 11. The flow rate and flow volume of the water in the input chamber 231 and the return chamber 232 are the same, and the baffle 3 is kept horizontal.

[0055] Continue to refer to Figures 2-7As shown, the valve body 11 includes a lower valve body 111 and an upper valve body 112 fixedly connected to the lower valve body 111. The materials of the lower valve body 111 and the upper valve body 112 can be plastic, metal, or a composite material made of plastic and metal. The lower valve body 111 is a hollow annular shape. The lower valve body 111 can have different models depending on the size of the straight tube 21 or the L-shaped tube 22. In this embodiment, the inner wall radius of the lower valve body 111 can be 32mm, which can be adjusted according to the actual situation. This embodiment does not specify a specific model. The upper valve body 112 is a hollow frustum structure, for example, a hollow frustum shape. The upper valve body 112 can have different models depending on the size of the L-shaped tube 22. In this embodiment, the inner radius of the lower bottom surface of the upper valve body 112 is 32mm, and the inner radius of the upper bottom surface of the upper valve body 112 is 16mm. The lower bottom surface of the upper valve body 112 is connected to and extends through the lower bottom surface of the lower valve body 111. In the length extension direction of the valve body 11, the projection of the lower valve body 111 coincides with the projection of the upper valve body 112.

[0056] The inner wall of the lower valve body 111 is provided with an internal valve thread (not marked in the figure) that connects with the external thread 203 of the L-shaped tube body 22. Through the internal valve thread and the external thread 203 of the tube body, the lower valve body 111 can be spirally connected to one end of the L-shaped tube body 22.

[0057] The upper bottom surface of the upper valve body 112 is the output port, and the lower bottom surface of the upper valve body 112 is the input port. A valve core 12 is installed in the through cavity of the output port and the input port. A sealing ring (not marked in the figure) of the same size and shape as the inner wall is provided on the inner wall of the upper valve body 112. The sealing ring is fixedly bonded to the inner wall of the upper valve body 112. The sealing ring is made of rubber. Rubber is elastic and can make the sealing ring and the valve core 12 fit tightly together to seal and prevent water leakage between the valve core 12 and the upper valve body 112.

[0058] The valve core 12 is a hemisphere, and the circular surface of this hemisphere is a concave surface 10 that is recessed away from the partition 3; the diameter of the valve core 12 is between the output port diameter and the input port diameter of the upper valve body 112; when the directional valve 1 is installed on the L-shaped tube 22, the radius of the valve core 12 is greater than the distance from the center of the valve core 12 to the partition 3; the valve core 12 is installed inside the upper valve body 112 and is connected to the hand grip ring 131 via the connecting rod 132; when the user rotates the hand grip ring 131, the concave surface of the valve core 12... When the upper valve body 112 is facing the partition 3, the outlet of the upper valve body 112 is blocked and closed by the hemisphere of the valve core 12. Water flows into the upper valve body 112 from the inlet chamber 231 and flows into the return chamber 232 at the concave surface 10 of the valve core 12. When the user continues to rotate the hand grip ring 131, and the concave surface 10 of the valve core 12 is facing away from the partition 3, the cavity of the upper valve body 112 near the return chamber 232 is blocked and closed by the hemisphere of the valve core 12. Water flows into the upper valve body 112 from the inlet chamber 231 and then exits from the outlet of the upper valve body 112.

[0059] The rotating ring 13 can be made of plastic, metal, or a composite material of plastic and metal. The grip ring 131 and the connecting rod 132 can be integrally manufactured by injection molding or casting. The grip ring 131 is disc-shaped, with its disc surface perpendicular to the partition 3. The middle of the side of the grip ring 131 closest to the upper valve body 112 is connected to one end of the connecting rod 132, with the connection point being the geometric center of that side of the grip ring 131. The connecting rod 132 is cylindrical, with one end connected to the geometric center of one side of the grip ring 131. After passing through the upper valve body 112, the end of the connecting rod 132 away from the grip ring 131 is connected to the valve core 12, which can be done by gluing or welding. The user can rotate the grip ring 131 to rotate the connecting rod 132, thereby rotating the valve core 12 connected to the connecting rod 132.

[0060] Continue to refer to Figure 2 and Figure 8 As shown, the material of the pipe body connector 41 can be plastic or metal. The pipe body connector 41 can have different models depending on the size of the straight pipe body 21 or the L-shaped pipe body 22. In this embodiment, the pipe body connector 41 is used for connecting a 32mm straight pipe body 21 or an L-shaped pipe body 22 as an example. The pipe body connector 41 includes a pipe body connecting plate 411, a pipe body flange ring 412 and a pipe body connecting ring 413. The pipe body connecting plate 411 is a rectangular plate. The pipe body flange ring 412 and the pipe body connecting ring 413 are both hollow cylindrical pipes. The pipe body connecting plate 411, the pipe body flange ring 412 and the pipe body connecting ring 413 can be integrally manufactured.

[0061] The tube connecting ring 413 is a hollow tube of uniform thickness, and its inner and outer diameters are the same as those of the straight tube 21 and the L-shaped tube 22.

[0062] Two pipe flange rings 412 are provided, respectively connected to the head and tail ends of the pipe connecting ring 413 along the length extension direction of the straight pipe 21. The length extension direction of the pipe flange ring 412 is the same as that of the pipe connecting ring 413, and the central axes of the pipe flange ring 412 and the pipe connecting ring 413 coincide. The inner diameter of the pipe flange ring 412 is equal to the outer diameter of the straight pipe 21 and the L-shaped pipe 22. The inner wall of the pipe flange ring 412 is provided with a flange internal thread 4121 that connects with the external thread 203 of the pipe. Through the flange internal thread 4121 and the external thread 203 of the pipe, the pipe flange ring 412 is spirally connected to one end of the straight pipe 21 and the L-shaped pipe 22. When the straight pipe 21 and the L-shaped pipe 22 are threadedly connected through the two pipe flange rings 412 of the same pipe connecting ring 413, the straight pipe 21 and the L-shaped pipe 22 can be connected to each other.

[0063] The pipe body connecting plate 411 is a rectangular plate. The width of the pipe body connecting plate 411 is equal to the inner diameter of the pipe body connecting ring 413, and the length of the pipe body connecting plate 411 is equal to the length of the pipe body connecting ring 413. The pipe body connecting plate 411 is fixedly connected to the inside of the pipe body connecting ring 413 and divides the inner cavity of the pipe body connecting ring 413 into two.

[0064] Continue to refer to Figure 2 , Figure 10 and Figure 11 As shown, the adapter connector 42 is frustum-shaped. The material of the adapter connector 42 can be plastic, metal, or a composite material made of plastic and metal. The adapter connector 42 can have different models depending on the size of the straight tube 21 or the L-shaped tube 22. In this embodiment, the adapter connector 42 is used for connecting a 32mm straight tube 21 or an L-shaped tube 22 as an example. The adapter connector 42 includes an adapter lower bottom surface 42L and an adapter upper bottom surface 42R. The adapter lower bottom surface 42L and the adapter upper bottom surface 42R are parallel to each other, and an adapter connecting plate 421 is provided between the adapter lower bottom surface 42L and the adapter upper bottom surface 42R.

[0065] The adapter upper bottom surface 42R is provided with an adapter right through hole 422. The adapter right through hole 422 is a circular hole. The inner diameter of the adapter right through hole 422 is larger than the outer diameter of the straight tube body 21. The inner wall of the adapter right through hole 422 is provided with an adapter right thread (not shown in the figure) that fits and connects with the external thread 203 of the tube body. Through the threaded connection between the adapter right thread and the external thread 203 of the tube body, the adapter upper bottom surface 42R of the adapter connector 42 can be fixedly connected to the straight tube body 21.

[0066] The adapter bottom surface 42L is provided with an adapter left through hole 423, and the inner wall radius of the adapter left through hole 423 is equal to 32mm. The depth of the adapter left through hole 423 is greater than 10mm. There are two adapter left through holes 423, and the inner wall of both adapter left through holes 423 is provided with adapter left threads (not shown in the figure). Through the two adapter left through holes 423, the adapter connector 42 can be threadedly connected to two standard pipe fittings with a diameter of 32mm, so that this embodiment can be used in conjunction with ordinary standard pipe fittings.

[0067] The adapter connecting plate 421 is a trapezoidal plate, the length of which is equal to the length of the adapter connector 42 minus the depth of the adapter left through hole 423. The adapter connecting plate 421 isolates the two adapter left through holes 423 from each other on the back of the adapter connector 42, and divides the adapter right through hole 422 in two. The adapter connecting plate 421 makes the two circular adapter left through holes 423 and the two semi-circular through holes of the adapter right through hole 422 corresponding to each other.

[0068] The specific installation process involves the following steps:

[0069] First, the external thread 203 of one end of the straight pipe body 21 and the external thread 203 of the L-shaped pipe body 22 are respectively connected to the internal threads of both ends of a pipe body connector 41, so that the partitions 3 of the straight pipe body 21 and the L-shaped pipe body 22 are respectively inserted into the pipe connecting plate grooves 4111 on both sides of a pipe connecting plate 411, thereby obtaining a spliced ​​water supply pipe of straight pipe body 21 and L-shaped pipe body 2.

[0070] Then, a diverter valve 1 is installed at the end of the L-shaped pipe 22 away from the straight pipe 21, and the L-shaped pipe 22 and the diverter valve 1 are threaded together; a faucet is normally installed at the end of the diverter valve 1 away from the L-shaped pipe 22; an adapter connector 42 is installed at the end of the straight pipe 21 away from the L-shaped pipe 22, so that the partition 3 of the straight pipe 21 engages with the adapter plate groove 4213 of the adapter connector 42, and the adapter right through hole 422 of the adapter connector 42 is connected to the straight pipe 21 through the adapter right thread and the external thread of the pipe. 203 Connection; Further, the water outlet of the water heater is connected to one of the adapter left through holes 423 of the adapter connector 42 through a standard pipe fitting, so that the hot water of the water heater is introduced into the input chamber 231 of the straight pipe body 21 and the L-shaped pipe body 22 through the adapter connector 42; the other adapter left through hole 423 of the adapter connector 42 is connected to the water inlet pipe of the water heater through a standard pipe fitting, so that the cold water in the return chamber 232 of the straight pipe body 21 and the L-shaped pipe body 22 can be recycled and reheated.

[0071] Finally, in the specific process of use, refer to Figure 2 , Figure 3 and Figure 12As shown, first observe the color of the thermochromic coating 233 near the diverting valve 1. The input chamber 231 and return chamber 232 near the diverting valve 1 are both filled with cold water, and the color of the thermochromic coating 233 is X. Rotate the handle ring 131, causing it to rotate within the valve body 11, thereby rotating the valve core 12 within the valve body 11. When the concave surface 10 of the valve core 12 faces the partition 3, the output port of the upper valve body 112 is blocked by the hemisphere on the side of the valve core 12 away from its concave surface 10. Cold water flows from the input chamber 231 into the upper valve body 112, and then flows into the return chamber 232 from the concave surface 10 of the valve core 12. With the outflow of hot water from the water heater and the continuous return of cold water in the input chamber 231, continue to observe the thermochromic coating 233. The color change of 3; after a certain period of time, hot water flows into the input chamber 231, and the color of the thermochromic coating 233 changes to Y color, indicating that the cold water in the water supply pipe has been completely discharged; further rotate the hand grip ring 131 so that the concave surface 10 of the valve core 12 faces the input chamber 231, and the edge of the concave surface 10 of the valve core 12 contacts the partition 3 in the water supply pipe; the cavity of the upper valve body 112 near the return chamber 232 is blocked and closed by the hemisphere of the valve core 12 away from its concave surface 10, and hot water flows from the input chamber 231 into the upper valve body 112, flows out through the concave surface 10 of the valve core 12 in the upper valve body 112 to the output port, and the output port is connected to the faucet. Then, if the faucet is opened and closed normally, hot water will flow out from the faucet.

[0072] It should be noted that this embodiment can be used for hot water installation pipes in household bathroom sinks.

[0073] In the first application embodiment, there is one L-shaped pipe body 22, three straight pipe bodies 21, three pipe body connectors 41, and one steering valve 1 and one adapter connector 42.

[0074] When assembling the aforementioned pipe-in-pipe return water device, firstly, one end of the L-shaped pipe body 22 is threadedly connected to the lower valve body 111 of the diverting valve 1; one end of the first straight pipe body 21 is connected to the end of the L-shaped pipe body 22 away from the diverting valve 1 via the first pipe body connector 41; the three straight pipe bodies 21 are connected sequentially along their length direction, and pipe body connectors are used between the L-shaped pipe body 22 and the first straight pipe body 21, as well as between adjacent straight pipe bodies 21. Specifically, the diverting valve 1 is installed on the L-shaped pipe... Body 22 is away from the first straight tube body 21. One end of the first straight tube body 21 is away from the first tube body connector 41 and is connected to one end of the second straight tube body 21 through the second tube body connector 41. One end of the second straight tube body 21 is away from the second tube body connector 41 and is connected to one end of the third straight tube body 21 through the third tube body connector 41. One end of the third straight tube body 21 is away from the third tube body connector 41 and is connected to the adapting lower bottom surface 42L of the adapting connector 42.

[0075] In the second application embodiment, there are two L-shaped pipe bodies 22, three straight pipe bodies 21, four pipe body connectors 41, and one steering valve 1 and one adapter connector 42.

[0076] When assembling the above-mentioned pipe-in-pipe return water device, two adjacent L-shaped pipes 22, two adjacent straight pipes 21, and one L-shaped pipe 22 and one straight pipe 21 are sequentially connected by pipe body connectors 41. Specifically, one end of the first L-shaped pipe 22 is first threadedly connected to the lower valve body 111 of the diverting valve 1; two consecutive L-shaped pipes 22 can be assembled to form a U-shaped or Z-shaped turn. The side of the second L-shaped pipe 22 away from the first L-shaped pipe 22 is connected to the first straight pipe 21, the first straight pipe 21 is connected to the second straight pipe 21, and the second straight pipe 21 is connected to the third straight pipe 21 by pipe body connectors 41. The side of the third straight pipe 21 away from the second straight pipe 21 is connected to the adapter connector 42.

[0077] It should be noted that, depending on the actual layout of the hot water pipes for the bathroom sink in a household, multiple L-shaped pipes 22 can be connected. These L-shaped pipes 22 can be connected in pairs via pipe connectors 41, or connected to straight pipes 21 via pipe connectors 41. One L-shaped pipe 22 can form an L-shaped bend, and two L-shaped pipes 22 can form a U-shaped bend or a Z-shaped bend. The number of L-shaped pipes 22 can be selected based on the actual laying space. Furthermore, depending on the length of the laying space, multiple straight pipes 21 can be connected. Multiple L-shaped pipes 22, multiple straight pipes 21, or L-shaped pipes 22 and straight pipes 21 can all be connected to a single pipe connector 41 to form a composite pipe. Multiple composite pipes can also be connected to each other via pipe connectors 41 to form a final pipe-in-pipe return water device suitable for the specific construction space.

[0078] Compared with the prior art, the pipe-in-pipe water return device provided in this embodiment achieves at least the following beneficial effects:

[0079] First, the pipe-in-pipe return water device provided in this embodiment can reduce the additional design and construction of return water pipelines, thus reducing the design and laying workload. For example, this embodiment uses a pipe-in-pipe design to allow hot water delivery and cold water return to occur in one pipe. When hot water is being delivered, cold water can return to the heating equipment along the same pipeline design. Furthermore, the straight pipe body 21 and L-shaped pipe body 22 provided in this embodiment allow the pipe-in-pipe return water device to be applied to different house types to meet specific design and usage needs.

[0080] Secondly, the pipe-in-pipe water return device provided in this embodiment can transport water flowing in the pipe in both directions, avoiding the waste of water stagnant in the pipe. Especially in some longer hot water pipelines, the water stagnant in the pipe is often large in volume. Using the pipe-in-pipe water return device provided in this embodiment can greatly save water resources. Furthermore, the cold water stagnant in the pipe is often hotter than the room temperature cold water. The stagnant cold water can be returned through the same pipeline, sharing the insulation material outside the water supply pipe. It can also be connected to the inlet pipe of the heating equipment near the heating equipment, which can reduce the heat loss of the stagnant water and allow the stagnant water to be heated again by the heating equipment more quickly.

[0081] Third, the pipe-in-pipe water return device provided in this embodiment allows for precise and free control of water return; the thermochromic coating 233 provided in this embodiment monitors the temperature changes of the water in the inlet chamber 231 and return chamber 232 near the faucet in real time. This monitoring is real-time and intuitive, avoiding long-term backflow and the energy waste caused by hot water backflow; at the same time, the diverting valve 1 provided in this embodiment can accurately perform diversion operation based on the heat and temperature information fed back by the thermochromic coating 233. The operation is simple and immediate, meeting the need for rapid hot water output.

[0082] In one alternative embodiment, combined with Figure 8 and Figure 9 As shown, the length extension direction of the pipe body connecting plate 411 is the same as the length extension direction of the pipe body connecting ring 413, and the width of the pipe body connecting plate 411 is the same as the inner diameter of the pipe body connecting ring 413; the pipe body connecting plate 4111 is provided at both ends of the pipe body connecting plate 4111, and the partition 3 in the L-shaped pipe body 22 near the straight pipe body 21 and the partition 3 in the straight pipe body 21 near the L-shaped pipe body 22 are respectively engaged with the connecting plate groove 4111.

[0083] Specifically, there are two connecting plate grooves 4111, which are respectively located on both sides of the pipe body connecting plate 411 near the pipe body flange ring 412; the length extension direction of the connecting plate groove 4111 is parallel to the width extension direction of the pipe body connecting plate 4111, and the two ends of the connecting plate groove 4111 extend through both sides of the width extension direction of the pipe body connecting plate 4111; the two connecting plate grooves 4111 can respectively fit into two different partitions 3.

[0084] With the above scheme, the partition 3 of a straight tube 21 and an L-shaped tube 22 can be connected and connected through the two connecting plate grooves 4111 of the tube connecting plate 411, and the input cavity 231 and return cavity 232 of the straight tube 21 and the L-shaped tube 22 at the connection point do not cross-flow.

[0085] In an alternative embodiment, continue to refer to Figure 10 and Figure 11As shown, the adapter connecting plate 421 has an adapter plate groove 4213 on the side near the straight tube body 21. The adapter plate groove 4213 is recessed on the side away from the straight tube body 21. The partition plate 3 of the straight tube body 21 on the side away from the L-shaped tube body 22 is snapped into the adapter plate groove 4213.

[0086] Specifically, an adapter plate groove 4213 is provided on the side of the adapter connecting plate 421 near the adapter right through hole 422; the length extension direction of the adapter plate groove 4213 is perpendicular to the height extension direction of the adapter connecting plate 421, and both ends of the adapter plate groove 4213 penetrate through both ends of this side of the adapter connecting plate 421; the adapter plate groove 4213 is inserted into the partition plate 3 of the straight tube body 21.

[0087] With the above scheme, when the input cavity 231 and return cavity 232 inside the straight pipe body 21 can be connected and communicated with the two semi-circular through holes of the right through hole 422, the water in the input cavity 231 and return cavity 232 will not flow through each other when flowing through the adapter connector 42.

[0088] In an alternative embodiment, continue to refer to Figure 7 As shown, the upper valve body 112 and the lower valve body 111 are an integral structure; by making them as one piece, the connection between the upper valve body 112 and the lower valve body 111 can be strengthened, and manufacturing costs can be saved.

[0089] In one optional embodiment, the L-shaped pipe body 22 is made of random copolymer polypropylene pipe, stainless steel pipe, steel-plastic composite pipe, or aluminum-plastic composite pipe, and the straight pipe body 21 is made of random copolymer polypropylene pipe, stainless steel pipe, steel-plastic composite pipe, or aluminum-plastic composite pipe, and the partition 3 is made of plastic or rubber. Random copolymer polypropylene pipe is non-toxic, hygienic, meets drinking water standards, and has good heat resistance; stainless steel pipe has strong corrosion resistance, high strength, long service life, and good hygienic performance, and does not pollute water quality. Steel-plastic composite pipe combines the high strength of steel pipe with the corrosion resistance and hygiene of plastic pipe, has a smooth inner wall, low water flow resistance, and is easy to install. Aluminum-plastic composite pipe has good flexibility, corrosion resistance, and heat insulation, is easy to install, can be bent freely, and is lightweight.

[0090] Example 2

[0091] Continue to combine Figure 3 and Figure 7 As shown, the upper valve body 112 has a connecting hole 1121 that matches the connecting rod 132, and the connecting rod 132 is connected to the valve core 12 through the connecting hole 1121.

[0092] Specifically, the upper valve body 112 is provided with a connecting hole 1121 that penetrates one side wall of the upper valve body 112 along its thickness direction. The connecting hole 1121 is circular, and the penetration direction of the connecting hole 1121 is the same as the width extension direction of the partition 3. The diameter of the connecting hole 1121 is the same as the outer diameter of the connecting rod 132 of the swivel ring 13. The connecting hole 1121 is used for the connecting rod 132 to pass through.

[0093] With the above scheme, the connecting rod 132 outside the upper valve body 112 can pass through the upper valve body 112, thereby realizing the connection between the connecting rod 132 and the valve core 12 inside the upper valve body 112.

[0094] The various technical features of this utility model are mutually complementary and functionally supportive of each other. In other words, the technical solution is not a "simple superposition" of technical features among multiple prior art documents. Therefore, this utility model does not fall under the category of "simple superposition" in Chapter 4 of Part II of the Patent Examination Guidelines.

[0095] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A pipe-in-pipe water return device, characterized in that, include: Pipe body, diaphragm, diverting valve and connectors, among which, The tube body includes an L-shaped tube body and a straight tube body connected to the L-shaped tube body. The L-shaped tube body is an L-shaped hollow cylinder, and the straight tube body is a straight hollow cylinder. The partition plate is provided inside the L-shaped tube body and the straight tube body respectively. The partition plate is a rectangular plate. The partition plate inside the L-shaped tube body is arranged horizontally along the direction of the L-shaped hollow cylinder, and the partition plate inside the straight tube body is arranged horizontally along the axis of the straight hollow cylinder. The partition plate divides the L-shaped tube body and the straight tube body into an input cavity and a return cavity that are parallel to each other. The outer wall of the L-shaped tube body away from the straight tube body is coated with a thermochromic coating. The diverting valve is located at the first end of the L-shaped pipe body away from the straight pipe body, and includes a valve body, a valve core, and a flow-switching ring. The valve body includes a lower valve body and an upper valve body connected to the lower valve body. The lower valve body is located on the side of the upper valve body closer to the L-shaped tube. The lower valve body has a hollow annular structure, and its inner wall surrounds the outer surface of the L-shaped tube on the side away from the straight tube. The upper valve body has a hollow frustum structure, with its lower bottom surface facing the lower valve body. The upper valve body has a parallel and interconnected inlet and outlet, with the inlet corresponding to the inlet cavity and the return cavity. The valve core, located inside the upper valve body, is a hemisphere. The surface of the hemisphere near the first end is concave, and the concave surface is recessed on the side away from the first end. The flow-converting ring includes a hand grip ring and a connecting rod connected to the hand grip ring. The hand grip ring is disc-shaped, and the connecting rod is cylindrical. The hand grip ring and the connecting rod form a T-shaped structure. The connecting rod passes through the upper valve body and is fixedly connected to the valve core. The connector includes a tube body connector and an adapter connector. The tube body connector is a hollow cylinder, and the adapter connector is a frustum structure. The L-shaped tube body and the straight tube body are connected through the tube body connector, and the adapter connector is connected to the side of the straight tube body away from the L-shaped tube body. The pipe body connector includes a pipe body connecting ring, a pipe body connecting plate, and a pipe body flange ring. The number of pipe body connecting rings is two. The head and tail ends of the pipe body connecting rings are respectively connected to the L-shaped pipe body and the straight pipe body through the pipe body connecting rings. The pipe body connecting plate is placed inside the pipe body connecting ring. The adapter connector is a hollow frustum structure, comprising a parallel upper and lower bottom surface. An adapter connecting plate is disposed between the upper and lower bottom surfaces. The upper bottom surface surrounds the side of the straight tube away from the L-shaped tube. A left through hole is provided on the lower bottom surface, extending along the length of the straight tube and penetrating the lower bottom surface. There are two left through holes, corresponding to the input cavity and the return cavity, respectively. The middle partition of the straight tube away from the L-shaped tube is snapped onto the adapter connecting plate near the side of the straight tube.

2. The pipe-in-pipe water return device according to claim 1, characterized in that, The length extension direction of the tube connecting plate is the same as that of the tube connecting ring, and the width of the tube connecting plate is the same as the inner diameter of the tube connecting ring. Connecting plate grooves are respectively opened at the head and tail ends of the tube connecting plate. The partition in the L-shaped tube body near the straight tube body and the partition in the straight tube body near the L-shaped tube body are respectively snapped into the connecting plate grooves.

3. The pipe-in-pipe water return device according to claim 1, characterized in that, The adapter connecting plate has an adapter plate groove on the side near the straight tube body, and the adapter plate groove is recessed on the side away from the straight tube body. The middle partition of the straight tube body on the side away from the L-shaped tube body is snapped into the adapter plate groove.

4. The pipe-in-pipe water return device according to claim 1, characterized in that, The upper valve body has a connection hole that matches the connecting rod, and the connecting rod is connected to the valve core through the connection hole.

5. The pipe-in-pipe water return device according to claim 1, characterized in that, The upper valve body and the lower valve body are an integral structure.

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