A pipe-in-pipe circulation system suitable for straight drinking water

Abstract

The utility model belongs to the field of domestic water technology, especially point to a kind of pipe-in-pipe circulation system suitable for direct drinking water, it includes: pipe-in-pipe pipeline, with main pipeline and several branch, branch still be provided with multiple water outlet connector;Functional module, with circulating pump and the functional component for water purification;Circulation control module, with electric circulation control valve installed on the return channel of main pipeline or / and branch and the balance valve core installed on the water outlet connector.In the system, the return flow of the branch far from circulating pump is greater than or equal to the return flow of the branch close to circulating pump, the effect of small near and large far is realized, the circulation efficiency and water quality of remote branch are ensured.At the same time, the range of internal circulation can be controlled according to the opening time of electric circulation control valve, both can reduce the working burden of circulating pump, and can further improve the circulation effect of corresponding branch.

Description

Technical Field

[0001] This utility model belongs to the field of domestic water technology, and specifically refers to a pipe-in-pipe circulation system suitable for direct drinking water. Background Technology

[0002] Utility model CN212956776U discloses a pipe-in-pipe circulating water system, comprising a pipe-in-pipe pipeline and pipe connectors. The pipe-in-pipe pipeline has an inner channel and an outer channel. The pipe-in-pipe pipeline has a first inner pipe mounting end connecting to the inner channel and a first outer pipe mounting end connecting to the outer channel. A circulation pipeline is provided between the first outer pipe mounting end and the first inner pipe mounting end. The circulation pipeline includes a circulation pipe and a circulation pump. The end of the pipe-in-pipe pipeline is connected to a liquid outlet device via a tail valve, the inner cavity of which connects the inner channel and the outer channel. This utility model, through the action of the circulation pump, can promote the timed circulation of liquid between the inner and outer channels, inhibiting the growth of bacteria and other harmful substances, and ensuring the cleanliness and hygiene of the water source.

[0003] A typical circulating water system needs to circulate water at least once every six hours to maintain internal water quality and prevent stagnant water from breeding bacteria. However, in actual use, when encountering long pipe-within-a-pipe systems, the branches closer to the circulation pump have higher pressure and flow rates, resulting in better circulation. Conversely, branches farther from the pump have relatively lower pressure and flow rates, leading to poorer circulation and sometimes even the furthest branch not participating in circulation at all. Furthermore, when there are many branches, circulating the entire system simultaneously can overload the circulation pump, affecting its lifespan. Summary of the Invention

[0004] The purpose of this invention is to provide a pipe-in-pipe circulation system that is simple in structure, can improve the overall circulation effect, and can circulate at regular intervals.

[0005] The purpose of this utility model is achieved as follows:

[0006] A pipe-in-pipe circulation system suitable for direct drinking water includes: a pipe-in-pipe pipeline having a main pipeline and several branch pipelines disposed on the main pipeline, both the main pipeline and the branch pipelines having inlet channels and return channels, and multiple outlet connectors disposed on the branch pipelines; a functional module having an inlet pipe, a circulation pump, and functional components for water purification, wherein the inlet end of the circulation pump is connected to the inlet pipe and the return channel of the main pipeline, and the outlet end of the circulation pump is connected to the inlet channel of the main pipeline; and a circulation control module having an electric circulation control valve installed on the return channel of the main pipeline and / or the branch pipelines, and a balancing valve core or a balancing valve containing the balancing valve core installed on the outlet connector and capable of conducting the inlet channel and the return channel, wherein when the circulation pump and the electric circulation control valve are open, internal circulation occurs among the functional components, the circulation pump, the corresponding inlet channel, the corresponding balancing valve core, the corresponding return channel, and the corresponding electric circulation control valve; the greater the medium pressure in the inlet channel where the outlet connector is located, the smaller the actual flow cross-section formed by the corresponding balancing valve core between the inlet channel and the return channel.

[0007] This utility model further includes an inlet channel that is the outer channel of a pipe-in-pipe system and a return channel that is the inner channel of a pipe-in-pipe system.

[0008] The present invention further includes a branch line comprising at least one first branch line disposed on the main pipeline and at least one second branch line disposed on the first branch line, wherein multiple water outlet connectors are disposed on the second branch line; and an electric circulation control valve is disposed at the end of the return channel of the first branch line or / and the second branch line.

[0009] The present invention further includes a branch line comprising at least one inlet pipe, wherein the inlet pipe is provided with multiple outlet connectors, and a balancing valve core or a balancing valve containing the balancing valve core is installed on the outlet connectors; the electric circulation control valve is an inlet electric circulation control valve and is located at the end of the return channel of the inlet pipe.

[0010] The present invention further includes an electric circulation control valve installed on a pipe-in-pipe pipeline via two three-way adapters. The three-way adapters have a pipe-in-pipe connection end for installing the pipe-in-pipe, an inner channel connection end for connecting the inner channel, and an outer channel connection end for connecting the outer channel. An electric circulation control valve is installed between the inner channel connection ends of the two three-way adapters, and an inlet control valve is provided between the outer channel connection ends of the two three-way adapters.

[0011] This utility model further includes: a water purification tank as a functional component, disposed between the inlet end of the circulating pump and the return channel of the main pipeline; the functional module also includes: a water purifier unit, disposed on the inlet pipe; an inlet check valve, disposed at the outlet end of the water purifier unit; a return check valve, disposed at the outlet end of the water purification tank; and a sterilizer, disposed between the outlet end of the circulating pump and the inlet channel of the main pipeline.

[0012] This utility model further includes a balance valve core comprising: a balance valve frame, installed at the end of a branch and used to separate the inlet channel and the return channel, and having a valve core mounting hole; a balance valve core rod, movably disposed on the valve core mounting hole; and a reset member, installed between the balance valve frame and the balance valve core rod, used to drive the balance valve core rod to reset; wherein, the balance valve core rod has a balance channel for connecting the inlet channel and the return channel, and the actual flow cross-sectional area formed by the balance channel and the balance valve frame changes with its axial position; when the medium pressure in the inlet channel is greater, the area of ​​the actual flow cross-section is smaller.

[0013] The present invention further includes a balance valve core rod having a reset component mounting part that abuts against a reset component, a valve stem part having a balance channel, and a sealing mounting part. The sealing mounting part is provided with a sealing component, which can seal the valve core mounting hole under the action of the reset component and realize unidirectional flow.

[0014] The present invention further includes a balance channel comprising at least one balance groove opened axially on the side wall of the valve stem portion, wherein the minimum radial cross section formed by the balance groove and the inner wall of the valve core mounting hole is the actual flow cross section; wherein the balance groove has a balance groove inlet section and a balance groove outlet section, and the size of the radial cross section of the balance groove inlet section gradually decreases or decreases in a stepwise manner along the axial direction away from the balance groove outlet section.

[0015] The present invention further includes a balance channel comprising at least one balance inlet hole disposed on the side wall of the valve stem portion, an inlet cavity disposed inside the valve stem portion, and at least one balance outlet hole disposed at the end of the valve stem portion, wherein the portion of the balance inlet hole not covered by the inner wall of the valve core mounting hole is the actual flow cross section.

[0016] The outstanding and beneficial technical effects of this utility model compared to the prior art are:

[0017] 1. Each outlet joint of this utility model is equipped with a balancing valve core. When the pipe-in-pipe circulation system circulates internally, the balancing valve cores in the branches closer to the circulation pump experience higher pressure, resulting in a larger axial movement distance of the valve core rod, a smaller actual flow cross-section, and a smaller return flow. Conversely, the balancing valve cores in the branches farther from the circulation pump experience lower pressure, resulting in a smaller axial movement distance of the valve core rod, a larger actual flow cross-section, and a larger return flow. Therefore, the return flow of the branches farther from the circulation pump is greater than or equal to the return flow of the branches closer to the circulation pump, achieving a smaller return flow near the pump and a larger return flow far away. This ensures the circulation efficiency and water quality of the distant branches, thereby improving the overall circulation efficiency and water quality of the pipe-in-pipe circulation system.

[0018] 2. When the circulating pump and corresponding electric circulating control valve of this invention are opened, internal circulation occurs between the functional components, the circulating pump, the corresponding inlet channel, the corresponding balance valve core, the corresponding return channel, and the corresponding electric circulating control valve. Simultaneously, the range of internal circulation can be controlled by adjusting the opening time of the electric circulating control valve. When the community is large and has many buildings, the opening time of the electric circulating control valves for different first branches (i.e., different buildings) can be controlled sequentially through system settings to achieve internal circulation for different buildings at different time periods. This reduces the workload on the circulating pump and further improves the circulation effect of the corresponding branch. When the community is small and has few buildings, all or some of the electric circulating control valves for the first branch can be controlled through system settings to achieve internal circulation.

[0019] 3. The balance valve core of this utility model includes a balance valve frame, a balance valve core rod, and a reset component. The balance valve core rod is provided with a balance channel for connecting the inlet channel and the return channel. The actual flow cross-section formed by the balance channel and the balance valve frame will change with its axial position. When the medium pressure in the inlet channel is greater, the area of ​​the actual flow cross-section is smaller, thereby realizing the adjustment of the return flow between the inlet channel and the return channel.

[0020] 4. The balance valve core rod of this utility model also has a sealing mounting part, which is equipped with a sealing component for sealing the balance valve core, preventing the medium (water) in the backflow channel (inner channel) from flowing back, and realizing one-way flow. When the water pressure is low, it can seal the backflow channel (inner channel), and the balance valve core can be used as a check valve core, which helps to ensure the outlet water pressure; when the water pressure is high, it opens the backflow channel (inner channel), and the balance valve core can be used as a pressure relief valve core. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the first type of pipe-in-pipe circulation system of this utility model.

[0022] Figure 2 This is a partially enlarged view of the first type of tube-in-tube circulation system of this utility model.

[0023] Figure 3 This is a schematic diagram of the state of the balance valve core when the return flow occurs at the end of the branch away from the circulating pump.

[0024] Figure 4 This is a schematic diagram of the structure of the first type of balance valve core of this utility model.

[0025] Figure 5 yes Figure 3 Sectional view at point AA.

[0026] Figure 6This is a schematic diagram of the state of the balance valve core when the backflow occurs at the end of the branch near the circulating pump of this utility model.

[0027] Figure 7 This is a schematic diagram of the installation structure of the second type of balance valve core of this utility model.

[0028] Figure 8 This is a schematic diagram of the installation structure of the third type of balance valve core of this utility model.

[0029] Figure 9 This is a schematic diagram of the installation structure of the fourth type of balance valve core of this utility model.

[0030] Figure 10 This is a schematic diagram of the second type of pipe-in-pipe circulation system of this utility model.

[0031] Figure 11 This is a schematic diagram of the third type of pipe-in-pipe circulation system of this utility model.

[0032] Figure 12 This is a partially enlarged view of the third type of tube-in-tube circulation system of this utility model.

[0033] The meaning of the labels in the diagram:

[0034] Pipe-in-pipe system: 1. Functional module; 2. Balancing valve core; 3. Dual-channel water meter; 4. Outlet control valve; 5. Electric circulation control valve; 6. T-connector; 7. Inlet control valve; 8. Water meter; 9. Branch inlet control valve; 10A. Branch backflow control valve; 10B. Main pipe; 11. Branch pipe; 12. First branch pipe 12A; Second branch pipe 12B; Inlet pipe 12C; Pipe-in-pipe system; 13. Pipe connector; 14. Inner pipe 141; Outer pipe 142.

[0035] Circulation pump 21, functional components 22, water purifier unit 211, purified water tank 212, inlet check valve 23, backflow check valve 24, inlet pipe 25, return pipe 26, sterilizer 27, inlet pump 28.

[0036] Balance valve bracket 31, valve core mounting hole 311, inner mounting part 312, annular protrusion 3121, outer mounting part 313, connecting part 314, balance valve core rod 32, reset element mounting part 321, valve stem part 322, balance inlet hole 3221, inlet cavity 3222, balance outlet hole 3223, sealing mounting part 323, balance groove 324, balance groove inlet section 3241, balance groove outlet section 3242, insertion part 325, sealing cover 326, reset element 33, sealing component 34, sealing ring 35.

[0037] The actual flow cross-section is 100. Detailed Implementation

[0038] The present invention will be further described below with reference to specific embodiments:

[0039] Example 1:

[0040] like Figure 1 As shown, a pipe-in-pipe circulation system suitable for direct drinking water is mainly used in scenarios such as residential buildings, villas, and hotels that require direct drinking water. It includes a pipe-in-pipe pipeline 1, a functional module 2, and a circulation control module.

[0041] The pipe-in-pipe system 1 includes a main pipe 11 and several branch pipes 12 disposed on the main pipe 11. Both are composed of a pipe-in-pipe 13 with an inlet channel and a return channel, and a pipe connector 14. Generally, both the pipe-in-pipe 13 and the pipe connector 14 include an inner pipe 141, an outer pipe 142, and a connecting portion connecting the two. The inner pipe 141 forms an inner channel, and an outer channel is formed between the inner pipe 141 and the outer pipe 142. In this embodiment, the cross-sectional area of ​​the outer channel is larger than that of the inner channel; therefore, the inlet channel is preferably the outer channel, and the return channel is preferably the inner channel. In other embodiments, the inlet channel can also be the inner channel, in which case the return channel is the outer channel.

[0042] In this embodiment, branch line 12 includes at least one first branch line 12A disposed on the main branch line 11 and at least one second branch line 12B disposed on the first branch line 12A. Multiple water outlet connectors are disposed on the second branch line 12B. The main branch line 11 can be arranged between various buildings to supply water to each building; the first branch line 12A is disposed between various floors of the corresponding building to supply water to each floor; the second branch line 12B is disposed between various user rooms on the corresponding floor to supply water to each user room; the water outlet connectors connect to the starting end of the inlet pipe in the user room and are sequentially equipped with a water outlet control valve 5 and a water meter 9. The water outlet control valve 5 is a manual main inlet valve used to control the opening and closing of the inlet pipe.

[0043] like Figure 2 As shown, functional module 2 includes an inlet pump 28, a water purifier unit 211, an inlet pipe 25, an inlet check valve 23, a circulation pump 21, a functional component for water purification 22, a backflow check valve 24, and a backflow pipe 26.

[0044] A water inlet pump 28, a water purifier unit 211, an inlet check valve 23, and a circulation pump 21 are sequentially installed on the water inlet pipe 25. The water inlet pump 28 is used to supply water to the water purifier unit 211, which is used to purify tap water. The inlet check valve 23 is used to prevent backflow of the inlet water. The circulation pump 21 is used to pressurize and circulate the purified water in the pipe-in-pipe 1. In this embodiment, the liquid inlet of the circulation pump 21 is connected to the liquid outlet of the water purifier unit 211, and the liquid outlet of the circulation pump 21 is connected to the liquid inlet channel (external channel) of the main pipeline 11. After being purified by the water purifier unit 211, the tap water is directly supplied to the user's inlet pipe through the circulation pump 21 and the external channel of the pipe-in-pipe 11.

[0045] Meanwhile, the return channel of the main pipeline 11 is connected to the inlet end of the circulation pump 21 via the return pipe 26. A functional component 22 is provided on the return pipe 26. In this embodiment, the functional component 22 is preferably a water purification tank 212 or a water purifier. The water purification tank 212 has the functions of purifying and storing water. The outlet end of the water purification tank 212 is connected to the inlet end of the circulation pump 21 via a return check valve 24. At this time, a circulation loop is formed between the circulation pump 21, the inlet channel (external flow channel), the return channel (internal flow channel), and the water purification tank 212. When the circulation pump 21 is turned on, the water inside the pipeline can continuously circulate internally through the functional component 22, ensuring the safety of the drinking water quality.

[0046] The order of the positions of the circulating pump 21 and the functional components 22 can be set according to actual needs.

[0047] Since both the inlet pipe 25 and the return pipe 26 are ordinary pipes, a T-shaped adapter 7 is provided at the beginning of the main pipeline 11 for easy installation. The T-shaped adapter 7 has a pipe-in-pipe connection end for installing the pipe-in-pipe 13, an inner channel connection end for connecting the inner channel, and an outer channel connection end for connecting the outer channel. The inner channel connection end is connected to the return pipe 26, and the outer channel connection end is connected to the outlet end of the circulation pump 21 through an ordinary pipe.

[0048] In this embodiment, the backflow check valve 24 is installed on the water inlet pipe 25, and the outlet end of the purified water tank 212 is connected to the water inlet pipe 25 between the outlet end of the water inlet check valve 23 and the inlet end of the backflow check valve 24. In this way, the water of the water purifier unit 211 can be replenished into the purified water tank 212.

[0049] In another embodiment, the reflux check valve 24 can also be directly installed on the reflux pipe 26, so that the inlet end of the circulating pump 21 is located between the outlet end of the inlet check valve 23 and the outlet end of the reflux check valve 24.

[0050] In another embodiment, the water tank 212 can be omitted, and the return channel of the main pipeline 11 can be directly connected to the liquid inlet of the water purifier unit 211 through the return pipe 26. In this case, the water purifier unit 211 serves as a functional component 22.

[0051] In another embodiment, a sterilizer 27 can also be installed at the outlet of the circulating pump 21 for water disinfection, further meeting the user's requirements for high-quality water.

[0052] like Figure 2 As shown, the circulation control module has an electric circulation control valve 6 installed on the return channel of the main pipeline 11 and / or the branch pipeline 12, and a balance valve core 3 or a balance valve containing the balance valve core 3 installed on the outlet connector and capable of connecting the inlet channel and the return channel. The balance valve core 3 is used to control the return flow from the inlet channel to the return channel on the branch pipeline 12. When the medium pressure in the inlet channel where the outlet connector is located is greater, the actual flow cross section formed by the corresponding balance valve core 3 between the inlet channel and the return channel is smaller.

[0053] In this embodiment, the electric circulation control valve 6 is the first branch electric circulation control valve, and is located at the end of the return channel of the first branch 12A (near the end of the return channel of the main branch 11) to control the circulation of the entire building.

[0054] Specifically, the electric circulation control valve 6 is installed on the first branch 12A of the pipe-in-pipe pipeline 1 via two three-way adapters 7. The three-way adapters 7 have a pipe-in-pipe connection end for installing the pipe-in-pipe, an inner channel connection end for connecting the inner channel, and an outer channel connection end for connecting the outer channel. The electric circulation control valve 6 is installed between the inner channel connection ends of the two three-way adapters 7, and an inlet control valve 8 is provided between the outer channel connection ends of the two three-way adapters 7. The inlet control valve 8 is used to control the water inlet of the first branch 12A, which is equivalent to the main water inlet valve of the building.

[0055] Two T-junctions 7 are also installed at the connection between the second branch 12B and the first branch 12A. A branch inlet control valve 10A for controlling the liquid inflow into the second branch 12B is installed between the outer channel connection ends of the two T-junctions 7. A branch return control valve 10B for controlling the return flow of the second branch 12B is installed between the inner channel connection ends of the two T-junctions 7. The branch inlet control valve 10A and the branch return control valve 10B can be manual or electric control valves. When there is no water demand on the corresponding floor for a long time (no one is living there), the branch inlet control valve 10A and the branch return control valve 10B can be directly closed to reduce the internal circulation pressure of the entire system.

[0056] When the circulation pump 21 and the corresponding electric circulation control valve 6 are opened, internal circulation occurs between the functional component 22, the circulation pump 21, the corresponding inlet channel, the corresponding balance valve core 3, the corresponding return channel, and the corresponding electric circulation control valve 6.

[0057] In this embodiment, the range of internal circulation can be controlled by adjusting the opening time of the electric circulation control valve 6. When the community is large and has many buildings, the opening time of the electric circulation control valve 6 for different first branches 12A (i.e., different buildings) can be controlled sequentially through system settings to achieve internal circulation for different buildings at different time periods. This reduces the workload on the circulation pump and improves the circulation effect of the corresponding branches. When the community is small and has few buildings, the electric circulation control valve 6 for all or some of the first branches 12A can be controlled through system settings to achieve internal circulation.

[0058] In another embodiment, an electric circulation control valve 6 can also be installed at the inlet end of the return pipe 26. In this case, the electric circulation control valve 6 is a main pipeline electric circulation control valve, used to control the internal circulation of the entire pipe-in-pipe circulation system. This solution is generally suitable for scenarios with relatively low water demand, such as small villas, where the internal circulation of the entire pipeline is achieved by controlling the main pipeline electric circulation control valve.

[0059] like Figure 3 As shown, the water outlet connector is the pipe connector 14, which can be a straight two-way connector, a bent two-way connector, etc. The balance valve core 3 is installed at the water outlet end of the pipe connector 14.

[0060] The balancing valve core 3 includes a balancing valve holder 31, a balancing valve core rod 32 with a balancing channel, a reset element 33, a sealing element 34, and a sealing ring 35. In this embodiment, the balancing valve core 3 is mainly used to realize the return flow from the inlet channel (outer channel) to the return channel (inner channel).

[0061] like Figure 4 , 5As shown, the balance valve frame 31 has an integrally formed inner mounting part 312, an outer mounting part 313, and several connecting parts 314 for connecting the inner mounting part 312 and the outer mounting part 313. The inner mounting part 312 has a tubular structure, with an annular protrusion 3121 protruding from its inner wall. A valve core mounting hole 311 is formed in the annular protrusion 3121. The inner tube 141 of the pipe connector 14 is provided with a mounting step at its end. The inner end of the inner mounting part 312 is mounted on the mounting step. A sealing ring 35 is provided between the mounting step and the annular protrusion 3121, thereby achieving sealing and positioning between the balance valve frame 31 and the inner tube 141. The outer mounting part 313 is provided with a connecting structure such as an external thread on its outer side, which can be directly or indirectly mounted on the outer tube of the pipe connector 14. The outer mounting part 31 is integrally fixedly connected to the inner mounting part 312 via the connecting part 314. The connecting part 314 is used to connect the inner mounting part 312 and the outer mounting part 313 on the one hand, and can also conduct the outer channel on the other hand. At this time, with the valve core mounting hole 311 as the dividing point, the balance valve frame 31 can separate the liquid inlet channel (outer channel) and the return channel (inner channel).

[0062] The balance valve core rod 32 is installed in the valve core mounting hole 311, and has a reset member mounting part 321 that abuts against the reset member 33, a valve stem part 322, and a sealing mounting part 323.

[0063] The outer diameters of the valve stem portion 322 and the sealing mounting portion 323 are adapted to the inner diameter of the valve core mounting hole 311. The sealing mounting portion 323 is provided with a sealing mounting groove, and a sealing component 34 is provided in the sealing mounting groove. The sealing component 34 is preferably an O-ring, and the outer diameter of the sealing component 34 is larger than that of the valve core mounting hole 311. The outer diameter of the reset component mounting portion 321 is larger than that of the valve core mounting hole 311, so that the balance valve core rod 32 can be moved and limited within the valve core mounting hole 311. The reset component mounting portion 321 is stepped annular, and a reset component mounting groove is provided on the annular protrusion 3121. A reset component spring is installed between the reset component mounting portion 321 and the reset component mounting groove to drive the balance valve core rod 32 to reset, so that the sealing component 34 can seal the valve core mounting hole 311 and achieve the sealing of the balance valve core 3, preventing the backflow of the medium (water) in the backflow channel (inner channel) and achieving unidirectional flow. When the water pressure is low, the return channel (inner channel) can be sealed, and the balance valve core 3 can be used as a check valve core, which helps to ensure the outlet water pressure; when the water pressure is high, the return channel (inner channel) is opened, and the balance valve core 3 can be used as a pressure relief valve core.

[0064] In this embodiment, the reset mounting part 321, the valve stem part 322, and the sealing mounting part 323 are integrally formed in sequence. In some embodiments, the three parts can also be set separately.

[0065] Generally, the main factors affecting the reflux flow rate are flow velocity and radial cross-sectional area. In this embodiment, the reflux flow rate between the inlet channel (outer channel) and the reflux channel (inner channel) is adjusted primarily by changing the radial cross-sectional area of ​​the balancing channel.

[0066] In this embodiment, a balance channel is provided on the valve stem portion 322 for connecting the liquid inlet channel and the return channel. The actual cross-sectional area formed by the balance channel and the balance valve frame 31 will change with its axial position. When the medium pressure in the liquid inlet channel is greater, the actual cross-sectional area of ​​the balance channel is smaller.

[0067] Specifically, the balancing channel includes at least one balancing groove 324 axially formed on the side wall of the valve stem portion 322. The balancing groove 324 has a balancing groove inlet section 3241 and a balancing groove outlet section 3242. The radial cross-sectional size of the balancing groove inlet section 3241 gradually decreases or decreases in a stepwise manner along the axial direction away from the balancing groove outlet section 3242.

[0068] Since the inner wall of the valve core mounting hole 311 (i.e., the annular protrusion 3121) has a certain length, when there is only one balance groove 324, the minimum radial section formed by the balance groove 324 and the inner wall of the valve core mounting hole 311 is the actual flow section; when there are multiple balance grooves 324, the sum of the minimum radial sections formed by each balance groove 324 and the inner wall of the valve core mounting hole 311 is the actual flow section.

[0069] Taking a balancing tank 324 in this embodiment as an example, the depth and / or width of the liquid inlet section 3241 of the balancing tank gradually decreases or decreases in a stepwise manner along the axis away from the liquid outlet section 3242 of the balancing tank. Figure 3 As shown, the depth of the liquid inlet section 3241 of the balance tank gradually decreases towards the axial direction of the reset component mounting part 321, that is, the bottom of the liquid inlet section 3241 of the balance tank is an inclined plane.

[0070] like Figure 3 As shown, since the liquid outlet section 3242 of the balance tank is located close to the return channel (inner channel), the balance valve core 3 is in a sealed state when the liquid inlet channel (outer channel) is not pressurized. When the pressure of the liquid inlet channel (outer channel) increases and exceeds the initial reset force of the reset component, it can push the balance valve core rod 32 to move axially, thereby opening the balance channel. The greater the pressure of the liquid inlet channel (outer channel), the greater the axial distance of the balance valve core rod 32 moving downward, the smaller the radial cross section of the balance tank liquid inlet section 3241 corresponding to the inner wall of the valve core mounting hole 311, and the smaller the return flow rate of the liquid inlet channel (outer channel) to the return channel (inner channel).

[0071] Preferably, the axial length of the outlet section 3242 of the balance tank is greater than or equal to the axial length of the valve core mounting hole 311, and the radial cross-section of the outlet section 3242 of the balance tank is always greater than or equal to the maximum radial cross-section of the inlet section 3241 of the balance tank. In the initial state of the balance valve core 3 being open, there can be the largest radial cross-section backflow. At this time, the inlet section 3241 of the balance tank has not yet entered the valve core mounting hole 311, and the backflow flow from the inlet channel (outer channel) to the return channel (inner channel) is the largest.

[0072] Preferably, the balancing groove 324 is straight, inclined or spiral. In this embodiment, the balancing groove 324 is preferably straight with axial orientation, and the groove width is consistent. The groove depth of the liquid inlet section 3241 of the balancing groove gradually decreases, which is convenient for processing.

[0073] like Figure 3 As shown, each branch of the pipe-in-pipe circulation system is equipped with a balance valve core 3. When the pipe-in-pipe circulation system is in internal circulation, as... Figure 5 As shown, the balance valve core 3 in the branch near the circulating pump experiences higher pressure, resulting in a larger axial movement distance of the balance valve core rod 32, a smaller actual flow cross-section, and a smaller return flow rate. Figure 2 As shown, the balancing valve core 3 in the branch far from the circulating pump has a smaller pressure, resulting in a smaller axial movement distance of the balancing valve core rod 32, a larger actual flow cross-section, and a larger backflow rate. Therefore, in this embodiment, the backflow rate of the branch 12 far from the circulating pump 21 is greater than or equal to the backflow rate of the branch 12 close to the circulating pump 21, achieving the effect of smaller backflow rate near the source and larger backflow rate far away. This ensures the circulation efficiency and water quality of the distant branch, thereby improving the overall circulation efficiency and water quality of the pipe-in-pipe circulation system.

[0074] It should also be noted that, in this embodiment, the scheme of installing the balance valve core 3 inside the pipe joint 14 can also be understood as a balance valve with the balance valve core 3.

[0075] In other embodiments, the balance valve core 3 can also be used to control the flow rate from the return channel (inner channel) to the inlet channel (outer channel).

[0076] In this embodiment, a balancing valve core is installed at the end of each branch. When the pipe-in-pipe circulation system circulates internally, the balancing valve cores in branches closer to the circulation pump experience higher pressure, resulting in a larger axial movement distance of the valve core rod, a smaller actual flow cross-section, and a smaller return flow. Conversely, the balancing valve cores in branches farther from the circulation pump experience lower pressure, leading to a smaller axial movement distance of the valve core rod, a larger actual flow cross-section, and a larger return flow. Therefore, the return flow of branches farther from the circulation pump is greater than or equal to the return flow of branches closer to the pump, achieving a smaller return flow near the pump and a larger return flow far away. This ensures the circulation efficiency and water quality of the distant branches, thereby improving the overall circulation efficiency and water quality of the pipe-in-pipe circulation system.

[0077] Example 2:

[0078] This embodiment is basically the same as Embodiment 1, except that the structure of the balance valve core 3 is different.

[0079] like Figure 7 As shown, the balance valve holder 31 has an integrally formed inner mounting part 312, an outer mounting part 313, and several connecting parts 314 for connecting the inner mounting part 312 and the outer mounting part 313. The inner mounting part 312 has a tubular structure, with an annular protrusion 3121 protruding from the inner wall of its end. A valve core mounting hole 311 is formed in the annular protrusion 3121. The inner tube 141 of the pipe connector 14 is provided with a mounting step at its end, and the inner mounting part 312 is mounted on the mounting step. The outer mounting part 313 is provided with an external thread or other connection structure on its outer side, and can be directly or indirectly mounted on the outer tube of the pipe connector 14. The outer mounting part 31 is integrally fixedly connected to the inner mounting part 312 through the connecting parts 314.

[0080] The balance valve core rod 32 is installed in the valve core mounting hole 311, and has a reset member mounting part 321 that abuts against the reset member 33, a sealing mounting part 323, a valve stem part 322, and an insertion part 325.

[0081] The outer diameter of the valve stem portion 322 is adapted to the inner diameter of the valve core mounting hole 311, and the valve stem portion 322 has a balance groove 324 structure similar to that in Embodiment 1. One end of the valve stem portion 322 is provided with an insertion portion 325, which is composed of multiple elastic buckles. The insertion portion 325 can pass through the inner diameter of the valve core mounting hole 311 and be installed in a limited position. The other end of the valve stem portion 322 is provided with a sealing mounting portion 323 and a reset component mounting portion 321 in sequence. The outer diameter of the sealing mounting portion 323 is larger than the inner diameter of the valve core mounting hole 311, and it is used to fit the sealing component 34. The sealing component 34 is preferably an annular washer, and the outer diameter of the sealing component 34 is larger than that of the valve core mounting hole 311, so that it can abut against the end of the annular protrusion 3121 to achieve a seal.

[0082] A resetting element, preferably a conical spring, is installed between the resetting element mounting portion 321 and the end of the inner tube 141 of the pipe connector 14. It drives the balance valve core rod 32 to reset, allowing the sealing component 34 to seal the valve core mounting hole 311 and achieve a seal for the balance valve core 3. The resetting element mounting portion 321 has multiple deformable limiting plates. When the conical spring is installed on the resetting element mounting portion 321, the limiting plates deform outwards, effectively fixing the conical spring.

[0083] In this embodiment, the reset mounting part 321, the sealing mounting part 323, the valve stem part 322, and the insertion part 325 are all integrally formed.

[0084] Example 3:

[0085] This embodiment is basically the same as Embodiment 2, except that the structure of the balance valve core rod 32 is different.

[0086] like Figure 8 As shown, the balance valve core rod 32 is installed in the valve core mounting hole 311, and has a reset member mounting part 321 that abuts against the reset member 33, a sealing mounting part 323, a valve stem part 322, and a sealing cover 326.

[0087] The outer diameter of the valve stem portion 322 is adapted to the inner diameter of the valve core mounting hole 311. The other end of the valve stem portion 322 is provided with a sealing mounting portion 323 and a reset component mounting portion 321 in sequence. The outer diameter of the sealing mounting portion 323 is larger than the inner diameter of the valve core mounting hole 311, and is used to fit the sealing component 34. The sealing component 34 is preferably an annular gasket, and the outer diameter of the sealing component 34 is larger than the valve core mounting hole 311, so that it can abut against the end of the annular protrusion 3121 to achieve a seal.

[0088] A resetting element, preferably a conical spring, is installed between the resetting element mounting portion 321 and the end of the inner tube 141 of the pipe connector 14. It drives the balance valve core rod 32 to reset, allowing the sealing component 34 to seal the valve core mounting hole 311 and achieve a seal for the balance valve core 3. The resetting element mounting portion 321 has multiple deformable limiting plates. When the conical spring is installed on the resetting element mounting portion 321, the limiting plates deform outwards, effectively fixing the conical spring.

[0089] The balancing channel includes at least one balancing inlet hole 3221 disposed on the side wall of the valve stem portion 322, an inlet cavity 3222 disposed inside the valve stem portion 322, and at least one balancing outlet hole 3223 disposed at the end of the valve stem portion 322.

[0090] In this embodiment, the reset mounting part 321, the sealing mounting part 323, and the valve stem part 322 are all integrally formed. The sealing cover 326 is fixed to the end of the valve stem part 322, and the outer diameter of the sealing cover 326 is larger than the inner diameter of the valve core mounting hole 311, which is due to the axial limitation of the balance valve core rod 32.

[0091] The balance outlet holes 3223 are located near the sealing mounting part 323, and the balance inlet holes 3221 are arranged axially. The portion of the balance inlet hole not covered by the inner wall of the valve core mounting hole 311 is the actual flow section. At this time, the greater the pressure in the inlet channel (outer channel), the greater the axial distance of the balance valve core rod 32 moving downward, the larger the area of ​​the balance inlet hole covered by the inner wall of the valve core mounting hole 311, and the smaller the actual inlet area of ​​the balance inlet hole, resulting in a smaller return flow from the inlet channel (outer channel) to the return channel (inner channel).

[0092] The balance inlet hole 3221 is a strip hole, an oblique hole, or a spiral hole. Preferably, its diameter gradually decreases or decreases in a stepwise manner along the axis away from the balance outlet hole 3222.

[0093] Example 4:

[0094] This embodiment is basically the same as Embodiment 1, except that the structure of the balance valve core rod 32 is different.

[0095] like Figure 9 As shown, the balance valve bracket 31 in this embodiment is basically the same as that in Embodiment 1.

[0096] The balance valve core rod 32 is installed in the valve core mounting hole 311, and has a reset member mounting part 321 that abuts against the reset member 33, a valve stem part 322, and a sealing mounting part 323.

[0097] The outer diameters of the valve stem portion 322 and the sealing mounting portion 323 are adapted to the inner diameter of the valve core mounting hole 311. The sealing mounting portion 323 is provided with a sealing mounting groove, and a sealing component 34 is provided in the sealing mounting groove. The sealing component 34 is preferably an O-ring, and the outer diameter of the sealing component 34 is larger than that of the valve core mounting hole 311. The outer diameter of the reset component mounting portion 321 is larger than that of the valve core mounting hole 311, so that the balance valve core rod 32 can be moved and limited within the valve core mounting hole 311. The reset component mounting portion 321 is stepped annular, and a reset component mounting groove is provided on the annular protrusion 3121. The reset component is preferably a spring, which is installed between the reset component mounting portion 321 and the reset component mounting groove to drive the balance valve core rod 32 to reset, so that the sealing component 34 can seal the valve core mounting hole 311.

[0098] In this embodiment, the reset mounting part 321, the valve stem part 322, and the sealing mounting part 323 are integrally formed in sequence.

[0099] The balancing channel includes at least one balancing inlet hole 3221 disposed on the side wall of the valve stem portion 322, an inlet cavity 3222 disposed inside the valve stem portion 322, and at least one balancing outlet hole 3223 disposed at the end of the valve stem portion 322.

[0100] The balance outlet holes 3223 are located near the sealing mounting part 323, and the balance inlet holes 3221 are arranged axially. The portion of the balance inlet holes not covered by the inner wall of the valve core mounting hole 311 is the actual flow cross section. At this time, the greater the pressure in the inlet channel (outer channel), the greater the axial distance of the balance valve core rod 32 moving downward, the larger the area of ​​the balance inlet hole portion covered by the inner wall of the valve core mounting hole 311, and the smaller the actual inlet area, resulting in a smaller return flow from the inlet channel (outer channel) to the return channel (inner channel).

[0101] The balance inlet hole 3221 is a strip hole, an oblique hole, or a spiral hole. Preferably, its diameter gradually decreases or decreases in a stepwise manner along the axis away from the balance outlet hole 3222.

[0102] To facilitate processing, a process hole is provided at the top of the balance valve core rod 32, and a sealing cap 326 is provided on the process hole.

[0103] Example 5:

[0104] This embodiment is basically the same as Embodiment 1, except that the electric circulation control valve 6 is installed in a different position.

[0105] like Figure 10 As shown, the electric circulation control valve 6 is the second branch electric circulation control valve and is located at the end of the return channel of the second branch 12B.

[0106] Specifically, the electric circulation control valve 6 is installed on the second branch 12B of the pipe-in-pipe pipeline 1 through two three-way adapters 7. The electric circulation control valve 6 is installed between the inner channel connection ends of the two three-way adapters 7, and the liquid inlet control valve 8 is provided between the outer channel connection ends of the two three-way adapters 7. The liquid inlet control valve 8 is used to control the water inlet of the second branch 12B, which is equivalent to the main water inlet valve of the corresponding floor in the building.

[0107] This embodiment can achieve internal circulation by controlling the electric circulation control valve 6 of different floors in different buildings, which has the advantage of higher control precision compared to embodiment one.

[0108] Two T-junctions 7 are also installed at the connection between the main pipeline 11 and the first branch pipeline 12A. A branch inlet control valve 10A for controlling the inflow of liquid into the first branch pipeline 12A is installed between the outer channel connection ends of the two T-junctions 7. A branch return control valve 10B for controlling the return flow of the first branch pipeline 12A is installed between the inner channel connection ends of the two T-junctions 7. The branch inlet control valve 10A and the branch return control valve 10B can be manual control valves or electric control valves. When the corresponding building has no water demand for a long time (no one is living there), the branch inlet control valve 10A and the branch return control valve 10B can be directly closed to reduce the internal circulation pressure of the entire system.

[0109] Example 6:

[0110] This embodiment is basically the same as Embodiment 1, except that the electric circulation control valve 6 is installed in a different position.

[0111] like Figure 11 As shown, branch line 12 includes at least one first branch line 12A, at least one second branch line 12B, and at least one inlet pipe 12C, all of which are composed of pipe-in-pipe and pipe joints. At this time, the main branch line 11 is laid out between various buildings, the first branch line 12A is set between various floors of the corresponding building, the second branch line 12B is set between various user rooms on the corresponding floor, and the inlet pipe 12C is distributed between various rooms of the user rooms.

[0112] In this embodiment, the inlet pipe 12C is provided with multiple water outlet connectors, and a balancing valve core 3 or a balancing valve containing the balancing valve core 3 is installed on the water outlet connector. At the same time, a water outlet control valve 5 is also installed on the water outlet connector. In this embodiment, the water outlet control valve 5 is preferably an angle valve.

[0113] The electric circulation control valve 6 is an inlet electric circulation control valve and is installed at the end of the return channel of the inlet pipe 12C. A dual-channel water meter 4 is installed at the beginning of the inlet pipe 12C. The dual-channel water meter 4 corresponds to the inlet channel and return channel of the second branch 12B and the inlet pipe 12C, respectively. When liquid enters the inlet channel of the inlet pipe 12C, the water meter reading increases; when liquid returns through the return channel of the inlet pipe 12C, the water meter reading decreases accordingly. The difference between the two is the actual amount of water used by the user.

[0114] This embodiment can achieve internal circulation by controlling the electric circulation control valve 6 of different chambers, which has higher control precision compared to embodiments one and two.

[0115] In addition, two T-connectors 7 are also provided at the connection between the main pipeline 11 and the first branch pipeline 12A. A first branch inlet control valve for controlling the liquid inlet of the first branch pipeline 12A is provided between the outer channel connection ends of the two T-connectors 7, and a first branch return control valve for controlling the return flow of the first branch pipeline 12A is provided between the inner channel connection ends of the two T-connectors 7.

[0116] Two T-connectors 7 are also provided at the connection between the second branch 12B and the first branch 12A. A second branch inlet control valve for controlling the liquid inlet of the second branch 12B is provided between the outer channel connection ends of the two T-connectors 7, and a second branch return control valve for controlling the return flow of the second branch 12B is provided between the inner channel connection ends of the two T-connectors 7.

[0117] The first branch inlet control valve, the second branch reflux control valve, and the second branch inlet control valve can be manual or electric control valves.

[0118] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A pipe-in-pipe circulation system suitable for direct drinking water, characterized in that, include: The pipe-in-pipe pipeline (1) has a main pipeline (11) and several branch pipelines (12) provided on the main pipeline (11). The main pipeline (11) and the branch pipelines (12) each have an inlet channel and a return channel. The branch pipelines (12) are also provided with multiple outlet connectors. The functional module (2) has an inlet pipe (25), a circulation pump (21) and a functional component (22) for water purification. The inlet end of the circulation pump (21) is connected to the inlet pipe (25) and the return channel of the main pipeline (11), respectively, and the outlet end of the circulation pump (21) is connected to the inlet channel of the main pipeline (11). The circulation control module has an electrically operated circulation control valve (6) installed on the return channel of the main pipeline (11) or / and branch pipeline (12), and a balance valve core (3) installed on the outlet connector and capable of connecting the inlet channel and the return channel, or a balance valve containing the balance valve core (3). When the circulating pump (21) and the electric circulating control valve (6) are opened, the functional component (22), the circulating pump (21), the corresponding liquid inlet channel, the corresponding balance valve core (3), the corresponding return channel and the corresponding electric circulating control valve (6) circulate internally. The greater the medium pressure in the inlet channel where the outlet connector is located, the smaller the actual flow cross section formed by the corresponding balance valve core (3) between the inlet channel and the return channel.

2. The pipe-in-pipe circulation system for direct drinking water according to claim 1, characterized in that: The inlet channel is the outer channel of the pipe-in-pipe system (1), and the return channel is the inner channel of the pipe-in-pipe system (1).

3. The pipe-in-pipe circulation system for direct drinking water according to claim 2, characterized in that: The branch (12) includes at least one first branch (12A) provided on the main branch (11) and at least one second branch (12B) provided on the first branch (12A), wherein a plurality of the water outlet connectors are provided on the second branch (12B); The electric circulation control valve (6) is located at the end of the return channel of the first branch (12A) or / and the second branch (12B).

4. The pipe-in-pipe circulation system for direct drinking water according to any one of claims 1-3, characterized in that: The branch (12) includes at least one inlet pipe (12C), which is provided with multiple outlet connectors, and the outlet connectors are equipped with a balance valve core (3) or a balance valve containing the balance valve core (3); The electric circulation control valve (6) is an inlet electric circulation control valve and is installed at the end of the return channel of the inlet pipe (12C).

5. The pipe-in-pipe circulation system for direct drinking water according to claim 2, characterized in that: The electric circulation control valve (6) is installed on the pipe-in-pipe pipeline (1) through two three-way adapters (7). The three-way adapters (7) have a pipe-in-pipe connection end for installing the pipe-in-pipe, an inner channel connection end for connecting the inner channel, and an outer channel connection end for connecting the outer channel. The electric circulation control valve (6) is installed between the inner channel connection ends of the two three-way adapters (7), and an inlet control valve (8) is provided between the outer channel connection ends of the two three-way adapters (7).

6. The pipe-in-pipe circulation system for direct drinking water according to claim 1, characterized in that: The functional component (22) is a clean water tank (212), which is located between the inlet end of the circulating pump (21) and the return channel of the main pipeline (11); The functional module (2) also includes: The water purifier unit (211) is installed on the water inlet pipe; An inlet check valve (23) is installed at the outlet end of the water purifier unit (211); A backflow check valve (24) is provided at the outlet end of the purified water tank (212); and The sterilizer (27) is located between the outlet of the circulating pump (21) and the inlet channel of the main pipeline (11).

7. The pipe-in-pipe circulation system for direct drinking water according to any one of claims 1-3, 5, and 6, characterized in that, The balance valve core (3) includes: A balance valve holder (31) is installed at the end of the branch (12) and is used to separate the inlet channel and the return channel, and has a valve core mounting hole (311). The balance valve core rod (32) is movably mounted on the valve core mounting hole (311), and A reset component (33) is installed between the balance valve frame (31) and the balance valve core rod (32) to drive the balance valve core rod (32) to reset; The balance valve core rod (32) has a balance channel for connecting the inlet channel and the return channel. The actual flow cross-section formed by the balance channel and the balance valve frame (31) changes with its axial position. The greater the medium pressure in the inlet channel, the smaller the actual flow cross-sectional area.

8. The pipe-in-pipe circulation system for direct drinking water according to claim 7, characterized in that: The balance valve core rod (32) has a reset member mounting part (321) that abuts against the reset member (33), a valve stem part (322) with the balance channel, and a sealing mounting part (323). The sealing mounting part (323) is provided with a sealing component (34), which can seal the valve core mounting hole (311) under the action of the reset member (33) and realize unidirectional flow.

9. The pipe-in-pipe circulation system for direct drinking water according to claim 8, characterized in that: The balancing channel includes at least one balancing groove (324) axially formed on the side wall of the valve stem portion (322), and the minimum radial cross section formed by the balancing groove (324) and the inner wall of the valve core mounting hole (311) is the actual flow cross section; The balancing tank (324) has a balancing tank inlet section (3241) and a balancing tank outlet section (3242). The radial cross-sectional size of the balancing tank inlet section (3241) gradually decreases or decreases in a stepwise manner along the axial direction away from the balancing tank outlet section (3242).

10. The pipe-in-pipe circulation system for direct drinking water according to claim 7, characterized in that: The balancing channel includes at least one balancing inlet hole (3221) disposed on the side wall of the valve stem portion (322), an inlet cavity (3222) disposed inside the valve stem portion (322), and at least one balancing outlet hole (3223) disposed at the end of the valve stem portion (322). The portion of the balancing inlet hole not covered by the inner wall of the valve core mounting hole (311) is the actual flow cross section.

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