Pipe-in-pipe passive circulation system

Abstract

The utility model belongs to the technical field of domestic water, and particularly relates to a pipe-in-pipe passive circulating system. Comprising a working device for storing water flow; the water outlet device is provided with a main liquid outlet pipe and at least one branch liquid outlet pipe, the water inlet end of the main liquid outlet pipe is connected to the working device, the water inlet end of the branch liquid outlet pipe is connected to the main liquid outlet pipe, and the water outlet end of the branch liquid outlet pipe is connected to the pipe-in-pipe device; the water return device is provided with a main water return pipe of which the water outlet end is connected to the working device, and at least one branch water return pipe of which the water inlet end is connected to the pipe-in-pipe device and the water outlet end is connected to the main water return pipe; a main water pump is mounted at one end of the main liquid outlet pipe or the main water return pipe close to the working device. The whole circulating system can be applied to a building with multiple floors and multiple residents, unified and centralized water supply is carried out, the number of working devices and the number of laid pipelines are reduced, and the installation cost and time are greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of domestic water, and particularly relates to a pipe-in-pipe passive circulation system. BACKGROUND

[0002] In the field of hot water or clean water supply, the old single-pipe water supply is generally adopted, which is welcomed by consumers due to the characteristics of convenient installation and low cost, and gradually becomes the industry installation specification and industry installation standard. However, when the single-pipe pipeline is relatively long, especially for hot water, a large amount of cold water in the pipeline needs to be emptied before the hot water is used, which leads to a relatively long waiting time for hot water and also causes a large amount of water resource waste.

[0003] With the continuous progress of science and technology, the concept of hot water circulation pipeline is introduced in the field of hot water supply, and hot water inlet pipe, hot water return pipe and cold water pipe are needed in the hot water circuit, and the simultaneous installation of the three pipelines can achieve the purposes of rapid water outlet and circulation use. However, the layout of the three pipes becomes a difficulty, which causes problems such as great design difficulty, high construction cost and great demand for pipeline raw materials, and development is hindered to some extent.

[0004] In order to overcome the above problems, the prior patent CN109611944B discloses a hot water circulation system adopting pipe-in-pipe pipeline laying, which can realize the functions of rapid water outlet and water saving. However, due to the limitation of the pipeline, the water circulation system is generally applicable to single-family household water supply, and is not applicable to centralized water supply of multi-family households. UTILITY MODEL CONTENT

[0005] The utility model aims at solving the above problems and provides a pipe-in-pipe passive circulation system capable of simultaneously supplying multiple households.

[0006] The utility model is achieved as follows:

[0007] The utility model provides a pipe-in-pipe passive circulation system, which has the following characteristics: a working device for storing water flow; a water outlet device connected to the working device and used for outputting the water flow in the working device; at least one pipe-in-pipe device connected to the water outlet device, receiving the water flow from the water outlet device and having a first channel and a second channel in communication with each other; and a water return device connected to the pipe-in-pipe device and the working device and used for conveying the water flow from the pipe-in-pipe device back into the working device; wherein the water outlet device has a main liquid outlet pipe with a water inlet end connected to the working device and at least one branch liquid outlet pipe with a water inlet end connected to the main liquid outlet pipe and a water outlet end connected to the first channel; the water return device has a main water return pipe with a water outlet end connected to the working device and at least one branch water return pipe with a water inlet end connected to the second channel and a water outlet end connected to the main water return pipe; and a total water pump is installed on the water inlet side or the water outlet side of the working device.

[0008] Preferably, the passive circulation system in the pipe-in-pipe proposed in this utility model may also have the following features: the pipe-in-pipe device includes an inlet valve and a pipe-in-pipe, wherein the inlet valve has: an outer valve body, which includes an inlet part connected to the outlet pipe, a return part connected to the return pipe, and a connecting part connected to the pipe-in-pipe; and an inner valve body, which is built inside the outer valve body, and an outer flow channel for water supply is formed between its outer wall and the inner wall of the outer valve body, and an inner flow channel for water supply is formed inside its interior.

[0009] Preferably, the passive circulation system in the pipe-in-pipe proposed in this utility model may also have the following features: an inlet valve core assembly is provided at the end of the outer flow channel away from the pipe-in-pipe. The inlet valve core assembly includes an inlet valve core, an inlet valve core spring, and a fixing component. The fixing component is fixed on the outer side of the inner valve body, and a convex ring is formed on the inner wall of the outer valve body. One end of the inlet valve core spring is fixed on the fixing component, and the other end is connected to the inlet valve core. The inlet valve core abuts against the convex ring under the action of the inlet valve core spring.

[0010] Preferably, the passive circulation system in the pipe-in-pipe proposed in this utility model may also have the following features: a return water valve core assembly is provided on the return water section, the return water valve having: a return water valve body, one end of which is installed on the return water section and the other end is used to install the branch return water pipe; a return water valve plate, which is pressed between the return water valve body and the return water section, and has a valve hole in the middle; a return water valve core and a return water valve core spring, one end of which is abutted against the return water valve body and the other end is connected to the return water valve core, and the return water valve core is sealed on the valve hole under the action of the return water valve core spring.

[0011] Preferably, the passive circulation system in the pipe-in-pipe proposed in this utility model may also have the following features: the return valve core is provided with a valve core bracket inserted into the inner valve body on the side away from the return valve core spring, the outer diameter of the valve core bracket is larger than the inner diameter of the valve hole, and the valve core bracket is provided with a flow groove for water supply.

[0012] Preferably, the passive circulation system in the pipe-in-pipe proposed in this utility model may also have the following features: the return water section includes a first return water section connected to the inner flow channel and a second return water section connected to the outer flow channel. A three-way pipe is installed on the first return water section. The three-way pipe has: a first connecting end connected to the first return water section; a second connecting end connected to the branch return water pipe, and a first valve core assembly is provided between the branch return water pipe and the branch return water pipe; and a third connecting end connected to the second return water section through a diversion pipe, and a second valve core assembly is provided on the diversion pipe.

[0013] Preferably, the passive circulation system in the tube-in-tube proposed in this utility model may also have the following features: the tube-in-tube has an outer tube and an inner tube, the outer tube is connected to the connecting part through a pipe joint, and its interior is connected to the outer flow channel and combined to form a first channel; the inner tube is built inside the outer tube, one end of which is connected to the inner valve body, and its interior is connected to the inner flow channel and combined to form a second channel.

[0014] Preferably, the passive circulation system in the pipe-in-pipe proposed in this utility model may also have the following feature: at least two parallel branch pipes are provided at one end of the main outlet pipe near the working device, and a main water pump is installed on each branch pipe.

[0015] Preferably, the passive circulation system in the tube-in-tube proposed in this utility model may also have the following feature: a filter is provided at one end of the main outlet tube near the working device.

[0016] Preferably, the passive circulation system in the pipe-in-pipe proposed in this utility model may also have the following features: the main outlet pipe and the main return pipe respectively have a vertically installed outlet straight pipe and return straight pipe in the wall of the house, the branch outlet pipes all lead to the outlet straight pipe, and the branch return pipes all lead to the return straight pipe; the working device is a water tank, a water heater, or a water purification device.

[0017] The outstanding and beneficial technical effects of this utility model compared to the prior art are:

[0018] The passive circulation system in the pipe-in-pipe configuration provided by this utility model has a first channel and a second channel, a main outlet pipe and at least one branch outlet pipe connected to the first channel, and a main return pipe and at least one branch return pipe connected to the second channel. On the one hand, the water flow can be circulated through the interconnected first and second channels. On the other hand, the entire circulation system can be applied to multi-story buildings with multiple households for unified and centralized water supply, reducing the number of working devices and pipelines, and greatly reducing installation costs and time. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the pipeline distribution in embodiments 1-4 of this utility model.

[0020] Figure 2 yes Figure 1 Enlarged view of a section at point S in the middle.

[0021] Figure 3 yes Figure 2 Enlarged view of a portion of point A in the middle.

[0022] Figure 4 yes Figure 1 Enlarged view of section B in the middle.

[0023] Figure 5 This is a schematic diagram of the water flow state when an individual user is dispensing water according to this utility model.

[0024] Figure 6 yes Figure 1 Enlarged view of a section at point C.

[0025] Figure 7 yes Figure 1 Enlarged view of a section at point D.

[0026] Figure 8 yes Figure 1 Enlarged view of a section at point E in the middle.

[0027] Figure 9 yes Figure 2 Enlarged view of a section at point F.

[0028] Figure 10 yes Figure 2 Enlarged view of a section at point G.

[0029] Figure 11 This is a schematic diagram of the pipeline distribution in Embodiment 5 of this utility model.

[0030] Figure 12 This is a schematic diagram of the pipeline distribution in Embodiment 6 of this utility model.

[0031] Figure 13 This is a schematic diagram of the pipeline distribution in Embodiment 7 of this utility model.

[0032] Reference numerals: Pipe-in-pipe passive circulation system 100, working device 10, water outlet device 20, main outlet pipe 21, branch pipe 211, branch main outlet pipe 212, branch outlet pipe 22, pipe-in-pipe device 30, inlet / outlet valve 31, pipe-in-pipe 32, outer pipe 321, inner pipe 322, support 323, outer valve body 33, water inlet 331, water return 332, first water return 3321, second water return 3322, connecting part 333, convex ring 334, inner valve body 34, outer flow channel 351, inner flow channel 352, pipe joint 36, first connecting end 371, second connecting end 372, third connecting end 373, diverter pipe 38, water outlet joint 39, water return device 40, main... 41. Return water pipe, 411. Branch main return water pipe, 42. Branch return water pipe, 51. Main water pump, 52. Check valve, 53. Inlet valve core, 61. Inlet valve core spring, 62. Fixing component, 63. Return water valve body, 64. Return water valve plate, 65. Valve hole, 651. Return water valve core, 66. Return water valve core spring, 67. Valve core bracket, 68. Manual gate valve, 71. Outlet tail valve, 72. Flow channel outlet, 720. Tail valve body, 721. Tail valve core, 722. Water passage trough, 7221. Tail valve spring, 723. Tail valve internal connector, 724. Valve core fixing seat, 725. Valve stem, 726. Inlet switch valve, 73. Water meter, 74. First valve core assembly, 75. Second valve core assembly, 76. Electric valve, 77. Sterilizer, 8. Detailed Implementation

[0033] The passive circulation system in a tube-in-tube configuration proposed in this utility model will be further described below with reference to specific embodiments:

[0034] Example 1:

[0035] This embodiment proposes a pipe-in-pipe passive circulation system 100, particularly applicable to centralized water supply systems with multiple user floors, where ordinary pipes drive a pipe-in-pipe system for water supply and circulation. Figures 1-3 As shown, the pipe-in-pipe passive circulation system 100 includes a working device 10, a water outlet device 20, at least one pipe-in-pipe device 30, and a return water device 40. The working device 10 can be a water tank, a water heater, or a water purifier. In this embodiment, the working device 10 is a water heater. The water outlet device 20 is connected to the working device 10 and is used to output the water flow from the working device 10. The pipe-in-pipe device 30 is connected to the water outlet device 20 and receives the water flow from the water outlet device 20. The return water device 40 is connected to the pipe-in-pipe device 30 and the working device 10, and is used to return the water flow from the pipe-in-pipe device 30 back to the working device 10, thereby forming a circulating water flow so that the water flow throughout the entire pipeline is hot, facilitating immediate use by the user.

[0036] Specifically, the tube-in-tube device 30 has a first channel and a second channel that are interconnected, such as... Figure 1 As shown, the water outlet device 20 has a main outlet pipe 21 and at least one branch outlet pipe 22. The inlet end of the main outlet pipe 21 is connected to the working device 10, and a main switch valve (such as...) is provided near the connection between the outlet end of the working device 10 and the main outlet pipe. Figure 1 The manual gate valve 71 shown is used. A main water pump 51 (i.e., a main water pump 51 is installed on the outlet side of the working device 10) is located downstream of the main outlet pipe 21. The inlet ends of each branch outlet pipe 22 are connected to the main outlet pipe 21, and the outlet ends of each branch outlet pipe 22 are connected to the first channel. The return water device 40 has a main return water pipe 41 and at least one branch return water pipe 42. The outlet end of the main return water pipe 41 is connected to the working device 10, and a tail switch valve (e.g., a manual gate valve 71) is located near the connection between the return water end of the working device 10 and the main outlet pipe. Figure 1 As shown in the diagram, the electric valve 77 is located upstream of the main return water pipe 41, where a check valve 52 is installed to ensure unidirectional water flow. The inlet of each branch return water pipe 42 is connected to the second channel, and the outlet of each branch return water pipe 42 is connected to the main return water pipe 41. Furthermore, a return water switch valve (such as...) is installed between each branch return water pipe 42 and the main return water pipe 41. Figure 1 The manual gate valve 78 shown.

[0037] like Figure 3 and Figure 4As shown, the pipe-in-pipe device 30 includes an inlet / outlet valve 31 and a pipe-in-pipe 32. The inlet / outlet valve 31 has an outer valve body 33 and an inner valve body 34. The outer valve body 33 includes an inlet portion 331 connected to the outlet pipe 22, a return portion 332 connected to the return pipe 42, and a connecting portion 333 connected to the pipe-in-pipe 32. The inner valve body 34 is built inside the outer valve body 33, and an outer flow channel 351 for water supply is formed between the outer wall of the inner valve body 34 and the inner wall of the outer valve body 33, and an inner flow channel 352 for water supply is formed inside the inner valve body 34. The inner flow channel 352 is a bidirectional flow channel, meaning that the water flow direction in the inner flow channel 352 can be either from the inner flow channel 352 to the outlet direction of the pipe-in-pipe 32, or from the pipe-in-pipe 32 to the return direction of the inner flow channel 352. The pipe-in-pipe 32 has an outer pipe 321 and an inner pipe 322. The outer pipe 321 is connected to the connection part 333 of the outer valve body 33 via a pipe joint 36. The inner pipe 322 is built inside the outer pipe 321 and connected to it as a whole via a bracket 323. One end of the inner pipe 322 is connected to the end of the inner valve body 35 away from the return water part 332. The channel formed between the outer pipe 321 and the inner pipe 322 is connected to the outer flow channel 351 to form the first channel. The channel inside the inner pipe 322 is connected to the inner flow channel 352 to form the second channel. There can be multiple pipe-in-pipes 32. Adjacent pipe-in-pipes 32 can be connected together by a two-way pipe, a three-way pipe, or a four-way pipe to extend the applicable range or adjust the laying direction.

[0038] In this embodiment, as Figure 3 As shown, an inlet valve core assembly is provided at one end of the outer flow channel 351 away from the pipe-in-pipe 32. The inlet valve core assembly includes an inlet valve core 61, an inlet valve core spring 62, and a fixing component 63. The fixing component 63 can be a gasket fixed to the outside of the inner valve body 34. A convex ring 334 is formed on the inner wall of the outer valve body 33. One end of the inlet valve core spring 62 is fixed to the fixing component 63, and the other end is abutted and connected to the inlet valve core 61. The inlet valve core 61 abuts against the convex ring 61 under the action of the inlet valve core spring 62. The return water section 332 is also equipped with a return water valve core assembly, which includes a return water valve body 64, a return water valve plate 65, a return water valve core 66, and a return water valve core spring 67. One end of the return water valve body 64 is threadedly installed on the outlet end of the return water section 332, and the other end is used for threaded installation of the branch return water pipe 42. The return water valve plate 66 is pressed between the return water valve body 64 and the return water section 332, and has a valve hole 651 in the middle. One end of the return water valve core spring 67 abuts against the inside of the return water valve body 64, and the other end is connected to the return water valve core 66. Under the action of the return water valve core spring 67, the return water valve core 66 can be sealed on the valve hole 651. Figure 3 As shown, when the water flows back from the inner flow channel 352, the water flow can push open the return valve core spring 67, allowing the water flow to pass through the valve hole 651, and then enter the branch return pipe 42. From the branch return pipe 42, the water flows through the main return pipe 41 and back to the working device 10, thus realizing the return of water.

[0039] The return valve core 66, on the side opposite to the return valve core spring 67, is also provided with a valve core bracket 68 that can be inserted into the inner valve body 34. The valve core bracket 68 is clearance-fitted with the inner valve body 34, and the outer diameter of the valve core bracket 68 is larger than the inner diameter of the valve hole 651, so that the valve core bracket 68 will not fall completely out of the valve hole 661 during the movement of the return valve core 66. The valve core bracket 68 is provided with a flow groove 681 for water to flow through. The cross-section of the valve core bracket 68 can be in the shape of a straight line, a cross, or a Y, etc., to ensure that the water can flow smoothly in the inner flow channel 352.

[0040] like Figure 4 As shown, water flows from the outlet pipe 22 through the inlet section 331 into the outer flow channel 351, and then flows along the outer flow channel 351 to the pipe-in-pipe 32. When multiple users use water simultaneously (e.g., multiple users open the thermostatic valves or other on / off valves after entering their homes), due to the pressure relief at the outlet, some water will push open the inlet valve core 61, allowing water to pass through the inlet valve core assembly 60 and then enter the inner flow channel 352, flowing from the inner flow channel 352 to the pipe-in-pipe 32, achieving dual water output from both the inner and outer flow channels, greatly increasing the water output. Furthermore, due to the high pressure relief caused by multiple users using water simultaneously, all water passing through the inlet valve core 61 will be sent out through the inner flow channel. At this time, the return valve core assembly is closed, and no return water is generated.

[0041] like Figure 5 As shown, when only one or a few households need water, they open the switch valve (such as the thermostatic valve after entering the house), and a large amount of water flows in from the inlet 331. Part of the water flows directly into the pipe-in-pipe 32 through the outer flow channel 351. Due to the pressure relief at the outlet, part of the water will push open the inlet valve core 61, allowing the water to pass through the inlet valve core assembly 60. In this part of the water flow, since the pressure relief pressure is not very large when a single household (or a few households) is discharging water, most of the water will enter the inner flow channel 352 and flow from the inner flow channel 352 to the pipe-in-pipe 32, realizing dual water discharge from the inner and outer flow channels. A small portion of the water can push open the return valve core assembly and flow from the branch return pipe 42 through the main return pipe 41 back to the working device 10, realizing water return.

[0042] like Figure 1 As shown, the application scenario of this embodiment can be a multi-story building. The main outlet pipe 21 and the main return pipe 41 each have a vertically installed outlet straight pipe and return straight pipe in the building walls. Each branch outlet pipe 22 branches off from the outlet straight pipe and connects to each floor. Each branch return pipe 42 connects to each floor and is connected to the return straight pipe. Each floor is equipped with one or more pipe-in-pipe devices 30. If each floor has multiple households, the pipe-in-pipe 32 can be extended and expanded at the end of each pipe-in-pipe 32 through a multi-port pipe, and an outlet tail valve 72, an inlet switch valve 73, and a water meter 74 can be installed at the end. For example,Figure 6 As shown, the outlet tail valve 72 has a tail valve body 721, a tail valve core 722, a tail valve spring 723, and a valve core fixing seat 725. The tail valve body 721 is threadedly fixed to the outer pipe 321, and the valve core fixing seat 725 is threadedly fixed inside the tail valve body 721. The tail valve core 722 is blocked in the inner pipe 322 under the action of the tail valve spring 723, and the tail valve core 722 is movably inserted through the middle of the valve core fixing seat 725. The valve core fixing seat 725 has a channel for water flow. When the user opens the switch valve, a large amount of water in the inner pipe 322 rushes towards the location of the tail valve core 722, which can open the tail valve core 722 to allow water to flow out for the user. When the user closes the switch valve, under the action of water pressure and the tail valve spring 723, the tail valve core 722 is pushed back and blocked in the inner pipe 322. There is a gap between the tail valve core 722 and the inner tube 322, and this gap can be as follows: Figure 6 The water passage groove 7221 shown is opened on the side of the tail valve core 722 facing the inner pipe 322. When the tail valve core 722 is blocked on the inner pipe 322, the water in the outer pipe 321 can slowly flow from the water passage groove 7221 into the inner pipe 322, and then flow back to the branch return pipe 42 along the inner pipe 322. Finally, it can flow back to the water heater along the main return pipe 41, thereby realizing water circulation.

[0043] After entering the house, the pipe-in-pipe 32 can be extended into multiple pipes 32 according to different rooms and different water outlets in the house, such as... Figure 10 As shown, the indoor water pipes also adopt the pipe-in-pipe 32, and they can be connected to each other using connectors such as T-joints. The final water outlet can be equipped with a thermostatic valve 55 or a manual switch valve, etc. The specific structure of the thermostatic valve 55 can be referred to a thermostatic valve disclosed in the prior patent CN213271075U.

[0044] The passive circulation system in the pipe-in-pipe described in this embodiment refers to the circulation of water within the pipe-in-pipe system through ordinary pipes (main inlet pipe, branch inlet pipe, main return pipe, and branch return pipe are all ordinary single pipes). The circulation here mainly refers to the water circulation from the working device 10 to the point before the water enters the household. Specifically, the water flows out of the working device 10 through the main inlet pipe 21, enters the pipe-in-pipe device 30 (the section up to the water meter in the household) through the branch inlet pipe 22, and is then transported to the household end by the pipe-in-pipe device 30. The water flows from the outlet valve 72 through the second channel to the branch return pipe, and then returns to the working device 10 through the main return pipe 41 to achieve circulation.

[0045] Example 2:

[0046] This embodiment is basically the same as the above embodiment, except that: in this embodiment, as Figure 7As shown, the return water section 332 has two parts, including a first return water section 3321 connected to the inner flow channel 352 and a second return water section 3322 connected to the outer flow channel 351. A three-way pipe is installed on the first return water section 3321. The three-way pipe has a first connecting end 371, a second connecting end 372 and a third connecting end 373. The first connecting end 371 is connected to the first return water section 3321. The second connecting end 372 is connected to the branch return water pipe 42, and a first valve core assembly 75 is provided between the second connecting end 372 and the branch return water pipe 42. The third connecting end 373 is connected to the second return water section 3322 through a diversion pipe 38, and a second valve core assembly 76 is provided on the diversion pipe 38. The first valve core assembly 75 and the second valve core assembly 76 can have the same structure, both including a valve body, a valve core, and a spring. The valve body has a water passage hole connected to the inner flow channel 352 or the outer flow channel 351. Under the action of the spring, the valve core is blocked on one side of the water passage hole. When water flows in from the inner flow channel 352 or the outer flow channel 351, the valve core can be pushed open to allow the water to flow into the return water pipe 42, realizing water return. In this embodiment, the outer valve body 33 and the inner valve body 34 can be integrally set.

[0047] Example 3:

[0048] This embodiment presents another implementation of the outlet valve 72 before the pipe-in-pipe 32 enters the household, which differs from the outlet valve 72 in Embodiment 1, such as... Figure 8 As shown, the outlet tail valve 72 of this embodiment has a tail valve body 721, a tail valve core 722, a tail valve spring 723, a tail valve inner connector 724, and a valve core fixing seat 725. The tail valve body 721 and the tail valve inner connector 724 are both L-shaped. One end of the tail valve body 721 is threadedly fixed to the outer pipe 321, and the tail valve inner connector 724 is threadedly fixed to the inner pipe 322. A flow channel outlet 720 communicating with the inside of the outer pipe 321 is formed between the outer periphery of the tail valve inner connector 724 and the inner wall of the tail valve body 721. One end of the valve core fixing seat 725 is threadedly connected to the inner wall of the outlet of the tail valve body 721, and the other end is connected to the outlet of the tail valve inner connector 724. The tail valve spring 723 and the tail valve core 722 are sleeved on the valve core fixing seat 725. The tail valve core 722 is blocked at the flow channel outlet 720 under the action of the tail valve spring 723. When the user opens the switch valve, a large amount of water in the inner pipe 322 flows out along the inner channel of the tail valve inner connector 724 toward the tail valve core 722, which can open the tail valve core 722 to allow water to flow out for the user. When the user closes the switch valve, under the action of water pressure and tail valve spring 723, the tail valve core 722 is pushed back and blocked at the flow outlet 720. The valve core fixing seat 725 has an axial channel for water flow, and there is a gap between the tail valve core 722 and the flow outlet 720. This gap can be as follows: Figure 8The water passage groove 7221 shown is opened on the side of the tail valve core 722 facing the flow channel outlet 720. When the tail valve core 722 is blocked on the flow channel outlet 720, the water flowing out from the outer pipe 321 along the tail valve body 721 can slowly flow into the tail valve inner connector 724 through the water passage groove 7221 and the channel on the valve core fixing seat 725, and then flow back to the branch return pipe 42 along the inner pipe 322. Finally, it can flow back to the water heater along the main return pipe 41, thereby realizing water circulation.

[0049] Example 4:

[0050] This embodiment presents another implementation of the outlet valve 72 before the pipe-in-pipe 32 enters the household, which is similar to the outlet valve 72 in Embodiment 1, such as... Figure 9 As shown, the outlet tail valve 72 of this embodiment has a tail valve body 721, a tail valve core 722, and a tail valve spring 723. The tail valve body 721 is threaded onto the outer pipe 321. The tail valve core 722 is blocked in the inner pipe 322 under the action of the tail valve spring 723. When the user opens the valve, a large amount of water in the inner pipe 322 rushes towards the tail valve core 722, which can open the tail valve core 722 to allow water to flow out for the user. When the user closes the valve, under the action of water pressure and the tail valve spring 723, the tail valve core 722 is pushed back and blocked in the inner pipe 322. There is a gap between the tail valve core 722 and the inner pipe 322, which can be as follows: Figure 9 The water passage groove 7221 shown is opened on the side of the tail valve core 722 facing the inner pipe 322. When the tail valve core 722 is blocked on the inner pipe 322, the water in the outer pipe 321 can slowly flow from the water passage groove 7221 into the inner pipe 322, and then flow back to the branch return pipe 42 along the inner pipe 322. Finally, it can flow back to the water heater along the main return pipe 41, thereby realizing water circulation.

[0051] In this embodiment, the tail valve core 722 is movably mounted within the tail valve body 721 via the valve stem 726, such as... Figure 9 As shown, a water outlet connector 39 is threadedly connected to the outlet end of the tail valve body 721. The valve stem 726 is rotatably mounted on the water outlet connector 39 via a thread. The inner end of the valve stem 726 passes through the water outlet connector 39, extends into the tail valve body 721, and inserts into the tail valve core 722, where it is fixed. A tail valve spring 723 is sleeved on the outside of the valve stem 726 and abuts against the tail valve core 722. This installation method allows the tail valve core 722 to be opened by rotating the handle at the outer end of the valve stem 726. Furthermore, in this embodiment, the inlet switch valve 73 can also be configured as follows: Figure 9 The ball valve shown.

[0052] Example 5:

[0053] This embodiment is basically the same as embodiments 1-4 above, except that...Figure 11 As shown, in this embodiment, the main water pump 51 is installed at one end of the main return water pipe 41 near the working device 10 (i.e., the main water pump 51 is installed on the water inlet side of the working device 10), and a check valve 52 is installed on the main return water pipe 41 downstream of the main water pump 51 (i.e., on the main return water pipe 41 between the main water pump 51 and the working device 10). No switch valve is needed on the main outlet pipe 31. This embodiment is more suitable for villas and large houses with multiple floors and rooms.

[0054] Example 6:

[0055] This embodiment is basically the same as embodiments 1-5 above, except that: Figure 12 As shown, the main outlet pipe 21 has at least two parallel branch pipes 211 at one end near the working device 10, and each branch pipe is equipped with a main water pump 51 and a check valve. Each branch pipe 211 can work alone or together. When working together, the water output is large, and even if one branch pipe fails to work properly for some reason, it can still work through the other branch pipe to ensure normal water supply.

[0056] In this embodiment, the main outlet pipe 21 merges with the parallel branch pipes 211 to form at least two branch main outlet pipes 212. Each branch main outlet pipe 212 is connected to several branch outlet pipes 22. Correspondingly, the main return pipe 41 also has at least two branch main return pipes 411, each branch main return pipe 411 is connected to several branch return pipes 42. The application scenario of this embodiment is a unified water supply scenario for multiple multi-story residential buildings, such as hotels.

[0057] Example 7:

[0058] Based on embodiments 1-6 above, this embodiment adds a sterilizer (or filter) to one end of the main outlet pipe 21 near the working device 10. After the main outlet pipe 21 is connected to the working device 10, a main water pump 51 is installed. The sterilizer 8 is installed downstream of the main water pump 51 and can disinfect or filter the incoming water.

[0059] Example 8:

[0060] This embodiment is basically the same as embodiments 1-7 above, except that the application scenario is centralized water supply for direct drinking water, such as... Figure 13As shown, the working device 10 is a water purification device. The incoming water is first purified by the water purification device and then transported to each household for use via the main outlet pipe 21. In this embodiment, the main water pump 51 is installed at the inlet end of the water purification device, and the main return water pipe 41 is connected to the inlet end of the water purification device via a connecting pipe 43. A check valve 53 is installed on the connecting pipe 43, so that the water can only flow from the main return water pipe 41 along the connecting pipe 43 to the main outlet pipe 21. The connection point of the connecting pipe 43 to the inlet end is located upstream of the main water pump 51, and the connection point of the connecting pipe 43 to the main return water pipe 41 is located upstream of the tail switch valve 54, so that the water from the main return water pipe 41 can be purified by the water purification device and then reused. The branch outlet pipe 22, the branch return water pipe 42, and the pipe-in-pipe device 30 are the same as those in embodiments 1-7 above, so they will not be described again.

[0061] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model. For example, in the above embodiments, the liquid outlet pipe 22 is connected to the first channel for water outlet, and the return water pipe 42 is connected to the second channel for water return. In actual situations, the liquid outlet pipe 22 can also be connected to the second channel for water inlet, and the return water pipe 42 can be connected to the first channel for water return. The installation methods of the corresponding valves can also be adjusted accordingly.

Claims

1. A pipe-in-pipe passive circulation system, characterized in that, include: Working device; A water outlet device, connected to the working device, is used to output the water flow from the working device; At least one pipe-in-pipe device is connected to the water outlet device, receives water flow from the water outlet device, and has a first channel and a second channel that are interconnected. as well as A water return device is connected to the pipe-in-pipe device and the working device, and is used to transport water from the pipe-in-pipe device back to the working device. The water outlet device has the following features: The main outlet pipe, whose inlet end is connected to the working device, and At least one branch pipe, the inlet end of which is connected to the main outlet pipe, and the outlet end of which is connected to the first channel; The water return device has the following features: The main return water pipe, whose outlet end is connected to the working device, and At least one branch return water pipe, with its inlet end connected to the second channel and its outlet end connected to the main return water pipe; A main water pump is installed on the inlet or outlet side of the working device.

2. The pipe-in-pipe passive circulation system according to claim 1, characterized in that: The tube-in-tube device includes an inlet / outlet valve and a tube-in-tube. The inlet and outlet valves have the following features: The outer valve body includes an inlet portion connected to the outlet pipe, a return portion connected to the return pipe, and a connecting portion connected to the pipe-in-pipe. The inner valve body is built inside the outer valve body, and its outer wall forms an outer flow channel for water supply between the inner wall of the outer valve body and the inner flow channel for water supply inside the inner valve body.

3. The pipe-in-pipe passive circulation system according to claim 2, characterized in that: An inlet valve core assembly is provided at one end of the outer flow channel away from the pipe-in-pipe. The inlet valve core assembly includes an inlet valve core, an inlet valve core spring, and a fixing component. The fixing component is fixed to the outside of the inner valve body. A convex ring is formed on the inner wall of the outer valve body. One end of the inlet valve core spring is fixed to the fixing component, and the other end is connected to the inlet valve core. The inlet valve core abuts against the convex ring under the action of the inlet valve core spring.

4. The pipe-in-pipe passive circulation system according to claim 2, characterized in that: The return water section is equipped with a return water valve core assembly, which has the following features: The return water valve body has one end installed on the return water section and the other end used to install the branch return water pipe; A return water valve plate is pressed between the return water valve body and the return water section, and a valve hole is opened in the middle. The return valve core and the return valve core spring are provided. One end of the return valve core spring is abutted against the return valve body, and the other end is connected to the return valve core. The return valve core is sealed on the valve hole under the action of the return valve core spring.

5. The pipe-in-pipe passive circulation system according to claim 4, characterized in that: The return water valve core is provided with a valve core bracket inserted into the inner valve body on the side opposite to the return water valve core spring. The outer diameter of the valve core bracket is larger than the inner diameter of the valve hole, and the valve core bracket is provided with a flow groove for water to flow through.

6. The pipe-in-pipe passive circulation system according to claim 2, characterized in that: The return water section includes a first return water section connected to the inner flow channel and a second return water section connected to the outer flow channel. A tee pipe is installed on the first return water section, and the tee pipe has the following characteristics: The first connecting end is connected to the first return water section; The second connection end is connected to the branch and return water pipes, and a first valve core assembly is provided between the second and return water pipes; and The third connection end is connected to the second return water section through a diversion pipe, and the diversion pipe is equipped with a second valve core assembly.

7. The passive circulation system in a tube according to any one of claims 2-6, characterized in that: The tube-in-tube configuration has an outer tube and an inner tube. The outer tube is connected to the connecting part via a pipe joint. The inner tube is built inside the outer tube, with one end connected to the inner valve body. The channel between the outer tube and the inner tube is connected to the outer flow channel and forms the first channel. The channel inside the inner tube is connected to the inner flow channel and forms the second channel.

8. The pipe-in-pipe passive circulation system according to any one of claims 1-6, characterized in that: The main outlet pipe is provided with at least two parallel branch pipes at one end near the working device, and the main water pump is installed on each branch pipe.

9. The pipe-in-pipe passive circulation system according to any one of claims 1-6, characterized in that: A filter is provided at one end of the main outlet pipe near the working device.

10. The pipe-in-pipe passive circulation system according to any one of claims 1-6, characterized in that: The main outlet pipe and the main return pipe each have a vertically installed outlet straight pipe and return straight pipe installed in the wall of the house. The branch outlet pipes all lead to the outlet straight pipe, and the branch return pipes all lead to the return straight pipe. The working device is a water tank, a water heater, or a water purification device.

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