Water circulation system for hotels

Abstract

The utility model belongs to the technical field of domestic water, and particularly relates to a water circulation system for hotels. The main pipeline device is provided with a liquid outlet pipeline, a return pipeline and at least one main water pump; the at least one pipe-in-pipe device is provided with at least one branch entering a room, and the branch comprises a first channel communicated with the liquid outlet pipeline and a second channel communicated with the backflow pipeline; the pipe-in-pipe device is further provided with at least one branch control unit used for controlling the branch to circulate, and the branch control unit comprises an electric control valve and a control switch which are installed on the branch and control connection and disconnection of the first channel and the second channel. A branch for entering a room and a branch control unit for controlling the branch to circulate are arranged in the pipe-in-pipe device, and the branch control unit comprises an electric control valve which is installed on the branch and controls the first channel and the second channel in the branch to be connected and disconnected and a control switch for controlling the electric control valve. Whether the water flow in the branch is started to circulate or not can be controlled through the control switch.

Description

Technical Field

[0001] This utility model belongs to the field of domestic water technology, and specifically refers to a hotel water recycling system. Background Technology

[0002] In the field of hot water supply for hotel rooms, the old-fashioned single-pipe system is generally used. Its popularity among consumers is due to its ease of installation and low cost, and it has gradually become the industry standard. However, when the single-pipe system is long, especially for hot water, a large amount of cold water needs to be drained from the pipe before hot water can be used, resulting in a long waiting time for hot water, affecting the guest experience, and also causing a significant waste of water resources.

[0003] With the continuous advancement of technology, the concept of hot water circulation pipelines has been introduced into the field of hot water supply. A hot water loop requires a hot water inlet pipe, a hot water return pipe, and a cold water pipe. The simultaneous installation of these three pipes achieves rapid hot water output and circulation. However, the layout of these three pipes has become a challenge, resulting in problems such as high design difficulty, high construction costs, and high demand for pipeline materials, thus hindering its development.

[0004] To overcome the aforementioned problems, prior patent CN109611944B disclosed a hot water circulation system using a pipe-in-pipe system for pipeline laying, which can achieve rapid water output and water conservation. However, due to pipeline limitations, this type of water circulation system is generally suitable for single-household water supply, but not for centralized heating systems with multiple floors and multiple households, such as hotels. Furthermore, even if a pipe-in-pipe system is laid across an entire floor or building, although it can solve the centralized heating problem, hotel rooms are a special scenario. If the water continues to circulate even when the hotel is unoccupied, heat can easily be wasted. Summary of the Invention

[0005] The purpose of this invention is to solve the above problems by providing a hotel water circulation system that can control the flow of water.

[0006] The purpose of this utility model is achieved as follows:

[0007] This utility model proposes a hotel water circulation system, characterized by comprising a main pipeline device having an outlet pipeline, a return pipeline, and at least one main water pump installed on the outlet pipeline or the return pipeline; and at least one pipe-in-pipe device having at least one branch entering a room, the branch containing a first channel connecting to the outlet pipeline and a second channel connecting to the return pipeline; wherein the pipe-in-pipe device further comprises at least one branch control unit for controlling the circulation of the branch, which includes an electrically controlled valve installed on the branch and controlling the opening and closing of the first and second channels, and a control switch for controlling the opening and closing of the electrically controlled valve; when the control switch is open, the electrically controlled valve controls the first and second channels to conduct, thereby realizing the circulation of the branch; when the control switch is closed, the electrically controlled valve controls the first and second channels to close, thereby closing the circulation of the branch.

[0008] Preferably, the hotel water circulation system proposed in this utility model may also have the following feature: the control switch is an induction switch, a manual switch, or a room power switch.

[0009] Preferably, the hotel water circulation system proposed in this utility model may also have the following features: the pipe-in-pipe device further includes: a main channel, comprising a third channel connected to the outlet pipe and a fourth channel connected to the return pipe, and a main channel control unit for controlling the circulation of the main channel, comprising an electric actuator valve for controlling the on / off of the third and fourth channels and an actuator switch for controlling the opening and closing of the electric actuator valve; wherein, the first channel is connected to the third channel and the second channel is connected to the fourth channel.

[0010] Preferably, the hotel water circulation system proposed in this utility model may also have the following features: the main pipeline also includes an inlet valve and a pipe-in-pipe main pipe, wherein the inlet valve has: an outer valve body, including an inlet part connected to the outlet pipeline, a return part connected to the return pipeline, and a connecting part connected to the pipe-in-pipe main 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.

[0011] Preferably, the hotel water circulation system 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 main pipe of the inner 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.

[0012] Preferably, the hotel water circulation system 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 core assembly having: a return water valve body, one end of which is installed on the return water section, and the other end for installing a return pipe; a return water valve plate, pressed between the return water valve body and the return water section, with a valve hole in the middle; a return water valve core and a return water valve core spring, one end of which abuts against the return water valve body, and the other end is connected to the return water valve core, the return water valve core being sealed on the valve hole under the action of the return water valve core spring; a valve core bracket inserted into the inner valve body is provided on the side of the return water valve core away from the return water valve core spring, the outer diameter of the valve core bracket being larger than the inner diameter of the valve hole, and a flow groove for water to flow through is provided on the valve core bracket.

[0013] Preferably, the hotel water circulation system proposed in this utility model may also have the following features: the main pipe-in-pipe system has a main outer pipe and a main inner pipe, the main outer pipe is connected to the connecting part through a pipe joint, the inner pipe is built inside the main outer pipe and one end is connected to the inner valve body; the channel between the main outer pipe and the main inner pipe is connected to the outer flow channel to form a third channel, and the channel inside the main inner pipe is connected to the inner flow channel to form a fourth channel.

[0014] Preferably, the hotel water circulation system proposed in this utility model may also have the following features: an electric actuator valve is installed at the end of the main pipeline, the electric actuator valve having: an actuator valve body, installed on the main outer pipe and sealing the main outer pipe; an actuator drive unit, installed on the control valve body, which opens or closes under the control of an actuator switch; an actuator valve core, having a closed state at the port of the inner pipe and an open state at the port away from the inner pipe; and an actuator valve stem, one end of which is connected to the actuator valve core and the other end of which is connected to the actuator drive unit; the actuator valve stem, driven by the actuator drive unit, drives the actuator valve core from the closed state to the open state.

[0015] Preferably, the hotel water circulation system proposed in this utility model may also have the following features: the liquid outlet pipeline has: a main liquid outlet pipe and at least one branch liquid outlet pipe, the inlet end of which is connected to the main liquid outlet pipe and the outlet end of which is connected to the first channel; the return pipeline has: a main return pipe and at least one branch return pipe, the inlet end of which is connected to the second channel and the outlet end of which is connected to the main return pipe.

[0016] Preferably, the hotel water circulation system proposed in this utility model may also have the following features: the inlet end of the main outlet pipe is provided with at least two parallel branch pipes, and each branch pipe is equipped with a main water pump; the branch outlet pipe is provided with an outlet control valve, and the branch return pipe is provided with a return control valve.

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

[0018] The hotel water circulation system provided by this utility model includes a branch line entering the room and a branch line control unit for controlling the circulation of the branch line within a pipe-in-pipe device. The branch line control unit contains an electric control valve installed on the branch line that controls the opening and closing of the first and second channels within the branch line, as well as a control switch for controlling the electric control valve. The control switch can be used to control whether the water flow in the branch line is circulated. For example, guests can directly start the hot water circulation in advance by controlling the switch when they check in, so that hot water can be circulated and delivered in advance for the convenience of guests' immediate use of water. When no one is staying, the control switch can be used to control the branch line to close the circulation, preventing water from circulating in unoccupied floors or rooms for a long time, thus saving energy. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the pipeline distribution in embodiments 1 and 3 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 water is supplied to individual rooms 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 This is a schematic diagram of the pipeline distribution in Embodiment 4 of this utility model.

[0027] Reference numerals: Hotel water circulation system 100, Working device 10, Outlet pipe 20, Main outlet pipe 21, Branch pipe 211, Branch main outlet pipe 212, Branch outlet pipe 22, Manual valve 23, Pipe-in-pipe device 30, Main line 30a, Branch line 30b, Inlet / outlet valve 31, Pipe-in-pipe main pipe 32, Main outer pipe 321, Main inner pipe 322, Branch outer pipe 323, Branch inner pipe 324, External connector 325, Internal connector 326, External valve body 33, Inlet section 331, Return section 332, Connecting section 333, Protruding ring 334, Inner valve body 34, Outer flow channel 351, Inner flow channel 352, Pipe connector 36, Outlet connector 39, Return pipe 40, Main return pipe 41, Branch main return pipe Flow pipe 411, branch return pipe 42, main water pump 51, check valve 52, inlet valve core 61, inlet valve core spring 62, fixed component 63, return valve body 64, return valve plate 65, valve hole 651, return valve core 66, return valve core spring 67, valve core bracket 68, flow groove 681, manual gate valve 71, electric actuator valve 72, actuator valve body 721, actuator drive unit 722, actuator valve core 723, actuator valve stem 725, inlet switch valve 73, electric control valve 74, control valve body 741, control drive unit 742, control valve core 743, control valve stem 745, electric valve 75, manual valve 77, manual gate valve 78, actuator switch 81, control switch 82. Detailed Implementation

[0028] The hotel water recycling system proposed in this utility model will be further described below with reference to specific embodiments:

[0029] Example 1:

[0030] This embodiment proposes a hotel water circulation system 100, particularly a centralized water supply system for hotel rooms, which uses ordinary pipes to drive a pipe-within-a-pipe system for water circulation. For example... Figures 1-3As shown, the hotel water circulation system 100 includes a working device 10, a main pipeline device, and at least one pipe-in-pipe device 30. The working device 10 can be a water heater or other device capable of heating water. In this embodiment, the working device 10 is a water heater. The main pipeline device has an outlet pipe 20 and a return pipe 40. At least one pipe-in-pipe device 30 is provided. The outlet pipe 20 is connected to the working device 10 and is used to output the water flow within the working device 10. The pipe-in-pipe device 30 is connected to the outlet pipe 20 and has at least one branch pipe 30b leading to a hotel room. This branch pipe 30b contains a first channel and a second channel that are interconnected. The first channel receives water from the outlet pipe 20, and the water flow in the first channel can flow into the second channel. The return pipe 40 connects the pipe-in-pipe device 30 and the working device 10, and is used to transport the water flow from the second channel of the pipe-in-pipe device 30 back to the working device 10, thereby forming a circulating water flow, so that the water flow in the entire pipe is hot water, which is convenient for users to use immediately.

[0031] Specifically, such as Figure 1 As shown, the liquid outlet pipeline 20 has a main liquid outlet pipe 21 and at least one branch liquid outlet pipe 22. The inlet end of the main liquid 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 liquid outlet pipe. Figure 1 The manual gate valve 71 shown is located downstream of the main outlet pipe 21, where a main water pump 51 is installed (i.e., a main water pump 51 is installed on the outlet pipe). The inlet end of each branch outlet pipe 22 is connected to the main outlet pipe 21, and the outlet end of each branch outlet pipe 22 is connected to the first channel. Each branch outlet pipe 22 is equipped with an outlet control valve (e.g., ...). Figure 1 The manual gate valve 23 shown can also be an electric valve, etc. The return line 40 has a main return pipe 41 and at least one branch return pipe 42. The outlet end of the main return pipe 41 is connected to the working device 10, and a tail switch valve (e.g., ...) is provided near the connection between the return end of the working device 10 and the main outlet pipe. Figure 1 The manual valve 77 shown is used as an example. A check valve 52 is installed upstream of the main return pipe 41 to ensure unidirectional water flow. An electric valve 75 can also be installed upstream of the check valve 52. The inlet of each branch return pipe 42 is connected to the second channel, and the outlet of each branch return pipe 42 is connected to the main return pipe 41. Each branch return pipe 42 is equipped with a return control valve (such as...). Figure 1 The manual gate valve 78 shown can also be an electric valve, etc. When the pipe-in-pipe device 30 is not used for a long time, the reflux control valve and / or the liquid outlet control valve can be directly closed to avoid waste.

[0032] like Figure 1As shown, each pipe-in-pipe device 30 includes a main channel 30a, a main channel control unit, at least one branch channel 30b, and a branch channel control unit. The main channel 30a has a third channel and a fourth channel. One end of the third channel is connected to the first channel, and the other end is connected to the outlet pipe. One end of the fourth channel is connected to the second channel, and the other end is connected to the return pipe. The main channel control unit is used to control the connection between the third and fourth channels in the main channel to circulate water. It includes an electric actuator valve 72 that controls the opening and closing of the third and fourth channels, and an actuator switch 81 that controls the electric actuator valve. One end of the main channel 30a is connected to the main channel device, and the other end is closed and equipped with the electric actuator valve 72. When the actuator switch 81 is open, the electric actuator valve 72 controls the third and fourth channels to open, so as to realize the circulation of the main channel; when the actuator switch 81 is closed, the electric actuator valve 72 controls the third and fourth channels to close, so as to close the circulation of the main channel.

[0033] The branch control unit is used to control the connection between the first and second channels within branch 30b to circulate water. The branch control unit includes an electrically operated control valve 74 installed on branch 30b that controls the opening and closing of the first and second channels, and a control switch 82 that controls the electrically operated control valve. One end of each branch 30b is connected to the main branch 30a, and the other end is open for installing pipes connecting to various water outlets within the room and is equipped with the electrically operated control valve 74. When the control switch 82 is open, the electrically operated control valve 74 controls the first and second channels to open, thus realizing circulation in the branch; when the control switch 82 is closed, the electrically operated control valve 74 controls the first and second channels to close, thus stopping the circulation in the branch.

[0034] The main pipeline 30a includes an inlet / outlet valve 31 and a main pipe within a 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 section 331 connected to the outlet pipe 22, a return section 332 connected to the return pipe 42, and a connection section 333 connected to the main pipe within a 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 main pipe within a pipe 32, or from the main pipe within a pipe 32 to the return direction of the inner flow channel 352.

[0035] In this embodiment, as Figure 3As shown, an inlet valve core assembly is provided at the end of the outer flow channel 351 away from the main 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.

[0036] 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 pipe 42 of the return pipeline. 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, realizing water return and thus realizing water circulation.

[0037] 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.

[0038] like Figure 4As shown, water flows from the outlet pipe 22 through the inlet 331 into the outer flow channel 351, and then flows along the outer flow channel 351 to the pipe-in-pipe 32. When the control switches 82 and electric control valves 74 of multiple households are opened, water flows in from the inlet 331. Part of the water flows directly into the main pipe-in-pipe 32 along the outer flow channel 351. Due to the pressure relief at the outlet, another part of the water can push open the inlet valve core 61, allowing the water to pass through the inlet valve core assembly 60 and then into the inner flow channel 352, flowing from the inner flow channel 352 to the main pipe-in-pipe 32, achieving dual water outlet through the inner and outer flow channels and increasing the water output. Furthermore, because multiple households are supplied with water simultaneously, the pressure relief is very high, causing the water flowing through the inlet valve core 61 to be sent out through the inner flow channel. At this time, the return valve core assembly is in the closed state and no return water is generated.

[0039] like Figure 5 As shown, when only one or a few households need water, they open the control switch 82 and the electric control valve 74. 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, since the pressure relief pressure is not very high when a single household (or a few households) is discharging water, most of it will enter the inner flow channel 352 and flow from the inner flow channel 352 to the pipe-in-pipe 32, achieving 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 into the working device 10, achieving water return.

[0040] One end of the main pipe within a main pipe 32 is connected to the inlet / outlet valve 31, and the other end is closed and equipped with the aforementioned electric actuator valve 72. The main pipe within a main pipe 32 has a main outer pipe 321 and a main inner pipe 322. The main outer pipe 321 is connected to the connection part 333 of the outer valve body 33 through a pipe joint 36. The main inner pipe 322 is built inside the outer pipe 321 and connected by a bracket to form an integral unit. One end of the main 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 main outer pipe 321 and the main inner pipe 322 is connected to the outer flow channel 351 to form the aforementioned third channel. The channel inside the main inner pipe 322 is connected to the inner flow channel 352 to form the aforementioned fourth channel. There can be multiple main pipes within a main pipe 32. Adjacent main pipes within a main pipe 32 can be connected together by pipe joints such as two-way pipes to extend the applicable range or adjust the laying direction.

[0041] like Figure 6As shown, the electric actuator 72 has an actuator body 721, an actuator drive unit 722, an actuator core 723, and an actuator stem 725. The actuator body 721 is mounted on the main outer pipe 321 and closes the main outer pipe 321. The actuator drive unit 722 is mounted on the actuator body 721 and is opened or closed under the control of the actuator switch 81. The actuator core 723 has a closed state at the port of the main inner pipe 322 and an open state at the port away from the main inner pipe 322. One end of the actuator stem 725 is connected to the actuator core 723, and the other end is connected to the actuator drive unit 722. Under the drive of the actuator drive unit 722, the actuator stem 725 drives the actuator core 723 to change from the closed state to the open state. For example, the actuator 722 is a motor, which is linked to the actuator switch 81. When the actuator switch 81 is opened, the motor is energized and starts working. The motor drives the actuator valve stem 725 to rotate. During the rotation, the actuator valve stem 725 pulls the actuator valve core 723 away from the main inner pipe 322, causing the outlet of the main inner pipe 322 to open, forming an open state. At this time, the water from the main outer pipe 321 can flow out along the main inner pipe 322 to form a water circulation. In the closed state, the water flow in the main outer pipe 321 and the main inner pipe 322 are cut off, and the water circulation is stopped. The actuator switch 81 can be a sensor switch, a manual switch, or a room power switch (the power switch is like the card-operated power switch at the entrance of a hotel room).

[0042] like Figure 3 As shown, branch line 30b has an external pipe 323 and an internal pipe 324. The external pipe 323 is connected to the main external pipe 321 via an external connector 325, and the internal pipe 324 is connected to the main internal pipe 322 via an internal connector 326. The internal pipe 324 is built inside the external pipe 323, forming the first channel mentioned above between the external pipe 323 and the internal pipe 324. The channel within the internal pipe 324 forms the second channel mentioned above. An electric control valve 74 is installed at the end of branch line 30b away from the main line 30a, such as... Figure 7As shown, the electric control valve 74 has a structure basically the same as the electric actuator valve 72, including a control valve body 741, a control drive unit 742, a control valve core 743, and a control valve stem 745. The control valve body 741 is mounted on the external pipe 323; the control drive unit 742 is mounted on the control valve body 741 through a bend connector 39 and is opened or closed under the control of the control switch 82; the control valve core 743 has a closed state when it is sealed at the port of the internal pipe 324 and an open state when it is away from the port of the internal pipe 324. One end of the control valve stem 745 is connected to the control valve core 723, and the other end is connected to the control drive unit 742. Under the drive of the control drive unit 742, the control valve stem 745 drives the control valve core 743 to change from the closed state to the open state. In the open state, the first channel and the second channel are connected, and the water flow from the first channel can flow into the second channel to form a circulation; in the closed state, the first channel and the second channel are cut off, and the water circulation is stopped. Among them, the control switch 82 can be a sensor switch, a manual switch, or a room power switch (the power switch is such as the switch at the entrance of a hotel room where a card is inserted to draw power).

[0043] The application scenario of this embodiment is mainly for centralized hot water supply for an entire hotel building, such as... Figure 1 As shown, the main outlet pipe 21 and the main return pipe 41 each have a vertically installed outlet straight pipe and return straight pipe installed in the building wall. 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 connects to the return straight pipe. Each floor is equipped with a pipe-in-pipe device 30. The main line 30a is the main pipe of each floor, and the branch lines 30b are the pipes connecting to each room. Each branch line 30b has an electric control valve 74 corresponding to a control switch 82. In this application scenario, the actuator switch 81 can be a sensor switch. For example, the actuator switch 81 can open when it senses someone passing by the floor, allowing water to flow into the main line 30a and starting the hot water circulation in the main line 30a. The control switch 82 is the room's power switch or a switch linked to the power switch. That is, after the resident moves in and plugs in the power, the control switch 82 can control the electric control valve 74 of the branch line 30b to open, so that the user can directly obtain hot water in subsequent use, realizing the function of instant heating. Branch line 30b is equipped with an inlet switch valve 73 (such as a manual ball valve) at its end. After entering the house, branch line 30b can extend into multiple pipe-in-pipe branch lines according to different rooms and different water outlets in the house. The water pipes in the house also adopt pipe-in-pipe, and they can be connected to each other using tee pipes or other connectors. Finally, a thermostatic valve 55 or a manual switch valve can be installed at the water outlet for control.

[0044] In practical applications, this can also be used for centralized hot water supply to multiple rooms on the same floor of a hotel. Each pipe-in-pipe device 30 supplies water to its corresponding room. The main line is eliminated; several branch lines enter the rooms and then connect to various water outlets within each room (such as washbasins, shower rooms, foot baths, bathtubs, etc.). In this scenario, the control switch 82 can be linked to the room's power switch. When a resident checks in and plugs in their card, the control switch 82 opens the electric control valve 74, allowing water to flow into the branch line 30b and into each terminal water outlet, providing immediate hot water access for the user.

[0045] The passive water circulation system used in this embodiment refers to the circulation of water within a pipe-in-pipe system (such as the main pipe in the main line and the pipes used in the branch lines, which are all ordinary single pipes) through ordinary pipes (the 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 main line 30a and the branch line 30b. Specifically, the water flows out of the working device 10 through the main inlet pipe 21, enters the main line 30a through the branch inlet pipe 22, and can circulate within the main line 30a itself. At the same time, the water is transported from the main line 30a to the branch line 30b. The water in the branch line 30b can then flow sequentially through the fourth channel and the second channel to the branch return pipe, and return to the working device 10 through the main return pipe 41 to achieve circulation.

[0046] Example 2:

[0047] This embodiment is basically the same as the above embodiment 1, except that: in this embodiment, the main water pump 51 is installed on the water inlet side of the working device 10 (i.e., installed on the return pipe), and the main return pipe 41 is located downstream of the main water pump 51 (i.e., on the main return pipe 41 between the main water pump 51 and the working device 10) and is equipped with a check valve 52, while no switch valve is required on the main outlet pipe 31.

[0048] Example 3:

[0049] This embodiment is basically the same as Embodiment 1 above, except that: Figure 1 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.

[0050] Example 4:

[0051] This embodiment is based on the above embodiment 3, such as Figure 8 As shown, 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 a large hotel with multiple buildings.

[0052] 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 outlet pipe 22 is connected to the third channel and the first channel (i.e., the external channel of the pipe-in-pipe), and water is discharged through the third channel and the first channel. The return pipe 42 is connected to the fourth channel and the second channel (i.e., the internal channel of the pipe-in-pipe), and water is returned through the fourth channel and the second channel. In actual situations, the outlet pipe 22 can also be connected to the fourth channel and the second channel, and water can be introduced through the fourth channel and the second channel. The return pipe 42 can be connected to the third channel and the first channel, and water can be returned through the third channel and the first channel. The installation methods of the corresponding valves can also be adjusted accordingly. In addition, the above embodiments are mainly described with hotels as the application scenario. In actual situations, it can also be installed in residential buildings such as villas and townhouses where centralized water supply is required.

Claims

1. A hotel water recycling system, characterized in that, include: The main pipeline system includes an outlet pipeline, a return pipeline, and at least one main pump installed on the outlet pipeline or the return pipeline; as well as At least one tube-in-tube device having at least one branch leading into a room, the branch containing a first channel connecting to the outlet line and a second channel connecting to the return line; The tube-in-tube device also has at least one branch control unit for controlling the circulation of the branch, which includes an electric control valve installed on the branch and controlling the opening and closing of the first channel and the second channel, as well as a control switch for controlling the electric control valve. When the electric control valve controls the first and second channels to be open, the circulation of this branch can be realized; When the electric control valve controls the first and second channels to close, it can shut down the circulation of that branch.

2. The hotel water recycling system according to claim 1, characterized in that: The control switch is an induction switch, a manual switch, or a room power switch.

3. The hotel water recycling system according to claim 1, characterized in that: The tube-in-tube device also has: The main channel includes a third channel connecting to the outlet pipeline and a fourth channel connecting to the return pipeline, and The main circuit control unit is used to control the main circuit to circulate, and includes an electric actuator valve for controlling the on / off state of the third and fourth channels, and an actuator switch for controlling the electric actuator valve. The first channel is connected to the third channel, and the second channel is connected to the fourth channel.

4. The hotel water recycling system according to claim 3, characterized in that: The main road also includes inlet and outlet valves and a main pipe within a pipe. The inlet and outlet valves have the following features: The outer valve body includes an inlet section connected to the outlet pipe, a return section connected to the return pipe, and a connection section connected to the main pipe within the 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.

5. The hotel water recycling system according to claim 4, characterized in that: An inlet valve core assembly is provided at the end of the outer flow channel away from the main pipe of the inner 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.

6. The hotel water recycling system according to claim 4, characterized in that: The return water section is provided with a return water valve core assembly, which has the following features: The return valve body has one end installed on the return section and the other end used to install the return 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, one end of the return valve core spring abuts against the return valve body and the other end is connected to the return valve core, and the return valve core is sealed on the valve hole under the action of the return valve core spring; 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.

7. The hotel water recycling system according to any one of claims 4-6, characterized in that: The main pipe-in-pipe system has an outer main pipe and an inner main pipe. The outer main pipe is connected to the connecting part through a pipe joint. The inner main pipe is built inside the outer main pipe and one end is connected to the inner valve body. The channel between the outer main pipe and the inner main pipe is connected to the outer flow channel to form the third channel. The channel inside the inner main pipe is connected to the inner flow channel to form the fourth channel.

8. The hotel water recycling system according to claim 7, characterized in that: The electrically actuated valve is installed at the tail end of the main pipeline, and the electrically actuated valve has the following characteristics: The valve body is installed on the main outer pipe and closes the main outer pipe; An actuator is mounted on the control valve body and is opened or closed under the control of the actuator switch. The valve core has a closed state that blocks the port of the main inner tube and an open state that leaves the port of the main inner tube; as well as The valve stem is connected at one end to the valve core and at the other end to the actuator drive unit; The actuator stem, driven by the actuator drive unit, causes the actuator valve core to change from the closed state to the open state.

9. The hotel water recycling system according to any one of claims 1-6, characterized in that: The liquid outlet pipeline has the following features: Main outlet pipe, 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 return pipeline has: Main return pipe, and At least one branch return pipe has its inlet end connected to the second channel and its outlet end connected to the main return pipe.

10. The hotel water recycling system according to claim 9, characterized in that: The main outlet pipe has at least two parallel branch pipes at its inlet end, and each branch pipe is equipped with the main water pump; the branch outlet pipe is equipped with an outlet control valve, and the branch return pipe is equipped with a return control valve.

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