A differential pressure type pipe-in-pipe liquid outlet pipeline system

Abstract

The present application belongs to the technical field of domestic water, and particularly relates to a differential pressure type pipe-in-pipe liquid outlet pipeline system. The system comprises a main pipeline, a plurality of branch pipelines, a differential pressure liquid inlet valve core, a plurality of differential pressure liquid outlet valve cores and a plurality of water outlet devices. The differential pressure liquid inlet valve core is arranged at the liquid inlet end of the pipeline and used for increasing the liquid inlet resistance of the liquid inlet end of the inner main flow channel; the plurality of differential pressure liquid outlet valve cores are arranged on the corresponding branch pipelines and used for increasing the liquid outlet resistance of the liquid outlet end of the outer branch flow channel; when the water outlet devices of one or more branch pipelines are opened, due to the existence of the differential pressure liquid inlet valve core and the differential pressure liquid outlet valve core, a pressure difference is generated between the inner flow channel and the outer flow channel, the pressure of the outer flow channel is higher than that of the inner flow channel, so that in the remaining branch pipelines, the liquid of the outer flow channel can flow back to the inner flow channel through the corresponding pipeline liquid outlet end, and finally flows out through the pipeline liquid outlet end of the opened water outlet device, and the internal water of all the branch pipelines of the system can flow at any time, so that the conditions of dead water and deteriorated water are prevented.

Description

Technical Field

[0001] This invention belongs to the field of domestic water technology, and specifically refers to a differential pressure pipe-in-pipe liquid outlet pipeline system. Background Technology

[0002] Currently, as living standards gradually improve, people are paying more and more attention to the quality of their drinking water.

[0003] A typical household water pipe system consists of a main pipe entering the house and multiple branch pipes distributing water to various rooms. As is well known, when water flows from a branch pipe, the water inside the pipe generally only travels through the main pipe and that branch pipe to reach the user. Water typically doesn't flow through the other branch pipes. On the main pipe, water usually only flows from the inlet to the connection point of the branch pipe; there is no water flow at the end of the main pipe. This causes water in branch pipes that are not used for a long time to remain stagnant in the pipes and slowly deteriorate. When the water is used again, it will be partially contaminated. Consuming this contaminated water over a long period can harm the user's health. Summary of the Invention

[0004] The purpose of this invention is to provide a simple differential pressure pipe-in-pipe liquid outlet pipeline system.

[0005] The objective of this invention is achieved as follows:

[0006] A differential pressure pipe-in-pipe liquid outlet pipeline system includes:

[0007] The main pipeline has an inner main channel and an outer main channel, and the inlet ends of the inner main channel and the outer main channel are interconnected to form the pipeline inlet end;

[0008] Several branch lines are distributed on the main pipeline, and each branch line has an inner branch flow channel and an outer branch flow channel. The ends of the inner branch flow channel and the outer branch flow channel are interconnected to form the liquid outlet of the pipeline. The inner branch flow channel and the inner main flow channel are interconnected to form an inner flow channel, and the outer branch flow channel and the outer main flow channel are interconnected to form an outer flow channel.

[0009] A differential pressure inlet valve core is installed at the inlet end of the pipeline to increase the inlet resistance of the inlet end of the inner main channel;

[0010] Several differential pressure discharge valve cores are installed on corresponding branches to increase the discharge resistance at the discharge end of the outer branch flow channel; and

[0011] Several water outlet devices are installed at the corresponding liquid outlet end of the pipeline;

[0012] When the water outlet device of one or more branches is opened, a pressure difference will be generated between the inner flow channel and the outer flow channel. The pressure of the outer flow channel will be higher than that of the inner flow channel, so that in the other branches, the liquid in the outer flow channel can flow back to the inner flow channel through the corresponding liquid outlet end of the pipe, and finally flow out through the liquid outlet end of the pipe with the water outlet device opened.

[0013] Preferably, the differential pressure inlet valve core includes an inlet valve body installed at the inlet end of the inner main channel, and the inlet valve body has at least one inlet hole.

[0014] Preferably, the differential pressure inlet valve core further includes an inlet valve plate and an inlet spring, wherein the inlet valve plate is movably disposed on the inlet hole via the inlet spring.

[0015] Preferably, the inlet valve plate or inlet valve body has an inlet guide channel that connects the inside and outside.

[0016] Preferably, the liquid inlet is formed on the side wall of the liquid inlet valve body, and the liquid inlet valve plate is movably disposed on the outside of the liquid inlet valve body and is used to open / seal the liquid inlet;

[0017] One end of the inlet spring abuts against the inlet valve plate, and the other end abuts against the outer wall of the inner main channel.

[0018] The inlet valve plate also has an outer extension portion located within the outer main channel. When water flow is generated in the outer main channel, the inlet valve plate can be moved through the outer extension portion to open the inlet hole of the inner main channel.

[0019] Preferably, the differential pressure outlet valve core includes an outlet support frame and an outlet valve plate disposed on the outlet support frame. The outlet valve plate is disposed at the outlet end of the outer branch flow channel, and at least one outlet guide channel is provided at the end of the outlet valve plate.

[0020] Preferably, the differential pressure outlet valve core further includes an outlet spring, which is disposed between the outlet support frame and the outlet valve plate.

[0021] Preferably, the water outlet device is a liquid outlet control valve, and the liquid outlet support frame has a liquid outlet mounting part, which is mounted on the liquid inlet end of the liquid outlet control valve by a fine-tuning spring.

[0022] Preferably, a three-way pipe joint is provided on the branch, the three-way pipe joint includes a joint mounting part for connecting two pipes and a valve assembly part for installing the differential pressure outlet valve core, and an inner pipe is provided between the two joint mounting parts for connecting the inner flow channel; the valve assembly part is provided with a partition hole that connects to the outer flow channel of the corresponding joint mounting part; the outlet support frame is sealed on the valve assembly part, and its outlet valve plate is provided on one of the partition holes.

[0023] Preferably, a water pump is installed on the main pipeline or branch pipeline, the inlet end of the water pump is connected to the external flow channel, the outlet end of the water pump is connected to the internal flow channel, and a check valve is installed.

[0024] Preferably, the water outlet device is equipped with a visual water outlet valve, which includes a water outlet valve body. The water outlet valve body has a first inlet end, a first outlet end, and a first control end connecting the two. A water outlet control valve core is provided inside the first control end. A transparent sealing element is provided on the side wall of the first inlet end. A water flow visibility element is provided inside the transparent sealing element. When water flows through, the water flow visibility element will move accordingly.

[0025] The outstanding and beneficial technical effects of this invention compared to the prior art are:

[0026] When the water outlet device of one or more branches is opened, due to the presence of the differential pressure inlet valve core and the differential pressure outlet valve core, a pressure difference will be generated between the inner flow channel and the outer flow channel. The pressure of the outer flow channel will be higher than that of the inner flow channel, so that in the other branches, the liquid in the outer flow channel can flow back to the inner flow channel through the corresponding outlet end of the pipe, and finally flow out through the outlet end of the pipe of the water outlet device. The internal water of all branches of the system can flow at any time, preventing stagnant water and deteriorated water. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the differential pressure tube-in-tube liquid outlet pipeline system of the present invention.

[0028] Figure 2 This is a schematic diagram of the structure of the first differential pressure inlet valve core of the present invention.

[0029] Figure 3 This is a schematic diagram of the structure of the second type of differential pressure inlet valve core of the present invention.

[0030] Figure 4 This is a schematic diagram of the structure of the third type of differential pressure inlet valve core of the present invention.

[0031] Figure 5 This is a schematic diagram of the structure of the fourth type of differential pressure inlet valve core of the present invention.

[0032] Figure 6 yes Figure 5 Sectional view at point AA.

[0033] Figure 7 This is a schematic diagram of the first differential pressure discharge valve core and its installation structure according to the present invention.

[0034] Figure 8 This is a schematic diagram of the second type of differential pressure discharge valve core and its installation structure according to the present invention.

[0035] Figure 9 This is a schematic diagram of the third type of differential pressure discharge valve core and its installation structure according to the present invention.

[0036] Figure 10 This is a schematic diagram of the fourth type of differential pressure discharge valve core and its installation structure according to the present invention.

[0037] Figure 11 This is a schematic diagram of the fifth type of differential pressure discharge valve core and its installation structure according to the present invention.

[0038] Figure 12 This is a schematic diagram of the sixth type of differential pressure discharge valve core and its installation structure according to the present invention.

[0039] Figure 13 This is a schematic diagram of the seventh type of differential pressure discharge valve core and its installation structure according to the present invention.

[0040] Figure 14 yes Figure 13 Cross-sectional view at point BB.

[0041] Figure 15 yes Figure 13 Cross-sectional view at point CC.

[0042] Figure 16 This is a schematic diagram of the eighth differential pressure discharge valve core and its installation structure according to the present invention.

[0043] Figure 17 yes Figure 16 Cross-sectional view at point DD.

[0044] Figure 18 This is a schematic diagram of the system structure of the present invention, which includes a water pump and a concealed differential pressure outlet valve core.

[0045] Figure 19 This is a schematic diagram of the water pump installation structure of the present invention.

[0046] Figure 20 This is a schematic diagram of the structure of the first concealed differential pressure discharge valve core of the present invention.

[0047] Figure 21 This is a schematic diagram of the structure of the second type of concealed differential pressure discharge valve core of the present invention.

[0048] Figure 22This is a schematic diagram of the structure of the third type of concealed differential pressure discharge valve core of the present invention.

[0049] Figure 23 This is a schematic diagram of the structure of the first visual water outlet valve of the present invention.

[0050] Figure 24 This is a schematic diagram of the structure of the second type of visualized water outlet valve of the present invention.

[0051] Figure 25 This is a schematic diagram of the main water inlet valve with a built-in differential pressure inlet valve core according to the present invention.

[0052] The meaning of the labels in the diagram:

[0053] 1-Main pipe; 2-Branch pipe; 3-Differential pressure inlet valve core; 4-Differential pressure outlet valve core; 5-Water outlet equipment; 6-Water pump; 7-Main inlet valve;

[0054] 11-Liquid inlet end of pipeline; 12-Inner flow channel; 13-Outer flow channel; 14-End pipe connector; 141-Pipe-in-pipe mounting end; 142-Threaded mounting end; 143-Inner pipe of connector; 1431-Second mounting surface; 144-Outer pipe of connector; 1441-First mounting surface; 15-Water pump mounting pipe connector;

[0055] 21-Liquid outlet end of pipeline; 22-Tee fitting; 221-Fit mounting part; 222-Valve assembly part; 223-Separation hole; 224-Separation part; 23-Ordinary fitting;

[0056] 31-Inlet valve body; 311-Limiting structure; 32-Inlet hole; 33-Inlet valve plate; 331-Outer extension; 332-Umbrella part; 333-Rod part; 334-Bracket connection part; 34-Inlet spring; 35-Inlet guide channel; 36-Adaptive spring; 37-Outer ring fixing ring; 371-Blocking ring part;

[0057] 41-Discharge support frame; 411-Discharge mounting part; 412-Slotted groove; 413-Guide groove; 42-Discharge valve plate; 421-Guide part; 422-Balance hole; 43-Discharge guide channel; 44-Discharge spring;

[0058] 51-Discharge control valve; 511-Fine-adjustment spring; 512-Guide groove;

[0059] 52-Visual water outlet valve; 521-Water outlet valve body; 522-Transparent seal; 523-Water flow visible object; 524-Visible object mounting bracket; 525-Drive shaft; 526-Power impeller; 527-Sealing ring.

[0060] 61 - Check valve;

[0061] 71-Stop valve body; 711-Main inlet; 712-Main control; 713-Main outlet; 714-Stop inner tube; 72-Stop valve cover; 73-Stop valve core; 731-Connecting rod; 732-Handwheel; 733-Lifting platform; 734-Sealing gasket. Detailed Implementation

[0062] The present invention will be further described below with reference to specific embodiments:

[0063] like Figure 1 As shown, a differential pressure pipe-in-pipe liquid outlet pipeline system includes a main pipeline 1, several branch pipelines 2, differential pressure inlet valve cores 3, several differential pressure outlet valve cores 4, and several water outlet devices 5.

[0064] The main pipeline 1 and several branch pipelines 2 are both composed of pipe-in-pipe and pipe-in-pipe connectors. Each pipe-in-pipe includes an inner pipe, an outer pipe, and a connecting portion between the inner and outer pipes. The inner and outer pipes are coaxially arranged, forming an internal flow channel within the inner pipe and an external flow channel between the inner and outer pipes. Similarly, each pipe-in-pipe connector includes an inner connector pipe 143, an outer connector pipe 144, and a connecting portion between the inner and outer connector pipes, used to connect the pipe-in-pipe and pipe-in-pipe fittings. Pipe-in-pipe connectors can be classified according to the number of connectors (e.g., two-way, three-way, four-way, etc.) and according to shape (e.g., straight-through, bent-pipe, etc.). For details on the specific structure of the pipe-in-pipe and connectors, please refer to the utility model patent with authorization announcement number CN207922346U.

[0065] In this embodiment, the main pipeline 1 has an inner main channel and an outer main channel. The inlet ends of the inner main channel and the outer main channel are interconnected to form a pipeline inlet end 11. A main water inlet valve 7 for connecting to the tap water pipe is installed on the pipeline inlet end 11. The main water inlet valve 7 is a common angle valve, which is equivalent to the main control valve of this system. When the main water inlet valve 7 is opened, both the inner main channel and the outer main channel are connected to the tap water pipe.

[0066] To facilitate installation, the inlet end 11 of the pipeline is equipped with an end pipe connector 14, which is a type of pipe-in-pipe connector used to connect a pipe-in-pipe to other equipment. The end pipe connector 14 includes at least one pipe-in-pipe mounting end 141 for connecting the pipe-in-pipe and at least one threaded mounting end 142 for connecting other equipment. The pipe-in-pipe mounting end 141 can connect to the pipe-in-pipe through heat fusion, snap-fit, threaded connection, etc. The threaded mounting end 142 typically has an internally threaded metal nest embedded at the end of the outer pipe of the connector. The main water inlet valve 7 is mounted on this metal nest.

[0067] Several branch lines 2 are distributed on the main pipeline 1 according to the needs of the rooms. Each branch line has an inner branch flow channel and an outer branch flow channel. The ends of the inner branch flow channel and the outer branch flow channel are interconnected to form a pipeline outlet end 21. The pipeline outlet end 21 is also equipped with an end pipe connector 14 to facilitate the installation of water outlet equipment 5 such as the outlet control valve 51 and the visual water outlet valve 52.

[0068] The inner branch channel and the inner main channel are interconnected to form the inner channel 12 of the system, and the outer branch channel and the outer main channel are interconnected to form the outer channel 13 of the system. The liquid inlet ends of the inner main channel and the outer main channel are the liquid inlet ends of the inner channel 12 and the outer channel 13, respectively, and the liquid outlet ends of the inner branch channel and the outer branch channel are the liquid outlet ends of the inner channel 12 and the outer channel 13, respectively.

[0069] The differential pressure inlet valve core 3 is installed at the inlet end 11 of the pipeline to increase the inlet resistance of the inlet end of the inner main channel.

[0070] Several differential pressure discharge valve cores 4 are installed on the corresponding branch 2 to increase the discharge resistance at the discharge end of the outer branch flow channel, thereby enabling priority discharge from the inner flow channel.

[0071] When all water outlet devices 5 are not turned on, the internal flow channel 12 and the external flow channel 13 are interconnected at the ends of each branch, and are therefore in a balanced state, i.e., an isobaric state.

[0072] When the water outlet device 5 of one or more branches 2 is opened, due to the presence of the differential pressure inlet valve core 3 and the differential pressure outlet valve core 4, a pressure difference is generated between the inner flow channel 12 and the outer flow channel 13. The pressure of the outer flow channel 13 will be higher than the pressure of the inner flow channel 12, so that in the other branches 2, the liquid in the outer flow channel 13 can flow back to the inner flow channel 12 through the corresponding pipe outlet end 21, and finally flow out through the pipe outlet end 21 of the water outlet device 5. The internal water of all branches of the system can flow at any time, preventing stagnant water and deteriorated water.

[0073] Specifically, when the water outlet device 5 of one or more branches 2 is opened, water will flow from the outlet ends of the inner and outer main channels of that branch simultaneously. However, due to the presence of the differential pressure outlet valve core 4, the water flow from the outer channel 13 is limited to a certain extent. At the outlet end 21 of the branch, the water flow from the outlet end of the inner channel 12 is easier than that from the outlet end of the outer channel 13. Therefore, the pressure in the inner channel 12 is released more quickly, and the pressure in the inner channel 12 is relatively lower than that in the outer channel 13, thus creating a passive pressure difference.

[0074] Furthermore, due to the presence of the differential pressure inlet valve core 3, water entering the inner flow channel 12 from the inlet end is restricted. Therefore, another portion of the water in the inner flow channel 12 comes from other unopened branches. That is, in these unopened branches, utilizing the aforementioned pressure difference and the connectivity of their outlet ends 21, water from the outer branch flow channels of the unopened branches can enter the inner main flow channel through the inner branch flow channels of that branch, and finally flow out through the inner branch flow channels of the outlet branch. The water flowing out from the outer branch flow channels of the outlet branch directly originates from the outer main flow channel of the main pipeline.

[0075] In this way, as long as any branch is in use at the water outlet device 5, the inner and outer branch channels of the other branches will participate in the liquid discharge, which can ensure that there are no dead water points in the entire system and greatly protect the safety of water use.

[0076] When the water outlet device 5 is closed, since the inner flow channel 12 and the outer flow channel 13 are interconnected at the end, they will quickly reach a balanced state, that is, an isobaric state.

[0077] It should be noted that the pipeline resistance generated by the differential pressure inlet valve core 3 and differential pressure outlet valve core 4 is not significant, far less than the pressure of tap water, and will not cause excessive internal losses, ensuring the normal operation of the inner and outer flow channels. The water at all pipeline outlets 21 primarily originates from the inlet 11 of the main pipeline 1, entering the inner and outer flow channels and exiting directly through the main pipeline and the branch line. A small portion originates from nearby unopened branch lines.

[0078] like Figure 1 As shown, this embodiment assumes that there is one main road and four branch roads, namely branch road ①, branch road ②, branch road ③ and branch road ④.

[0079] When the water outlet device 5 of branch 4 is turned on, the water in the outflow channel 13 of branch 4 comes from the outflow channel 13 of main pipeline 1. The water in the inflow channel 12 of branch 4 comes from the liquid inlet end of the inflow channel 12 of main pipeline 1 and the inflow channels 12 of branches 1, 2, and 3, while the water in the inflow channels 12 of branches 1, 2, and 3 comes from the outflow channels 13 of the corresponding branches and the outflow channel 13 of main pipeline 1.

[0080] like Figure 18-19 As shown, when there are many branches, the present invention can also be equipped with a water pump to boost water supply.

[0081] Specifically, the main pipeline 1 or branch pipeline 2 is equipped with a water pump 6 and a water pump mounting pipe joint 15. The water pump mounting pipe joint 15 is a type of pipe joint, which is a three-way valve, including a T-shaped inner pipe and an outer pipe, forming two pipe-in-pipe mounting ends 141 for mounting pipe-in-pipes and a threaded mounting end 142 for mounting the water pump. The inlet end of the water pump 6 is connected to the outer flow channel 13, and the outlet end of the water pump 6 is connected to the inner flow channel 12. A check valve 61 is provided at the outlet end of the water pump.

[0082] Differential pressure inlet valve core

[0083] The differential pressure inlet valve core 3 is installed at the inlet end 11 of the main pipeline 1, that is, inside the end pipe joint 14.

[0084] Example 1 of differential pressure inlet valve core:

[0085] like Figure 2 As shown, the differential pressure inlet valve core 3 includes an inlet valve body 31 installed at the inlet end of the inner main channel. The inlet valve body 31 has at least one inlet hole 32. The inlet hole 32 is a small hole. The water inlet area formed by all the inlet holes 32 is smaller than the cross-sectional area of ​​the inner main channel, thereby restricting the water inlet of the inner channel of the pipeline inlet end 11.

[0086] In this embodiment, the inlet valve body 31 has a U-shaped cross-section. The side wall of the inlet valve body 31 is adapted to the end of the inner tube of the end tube connector 14, so that the inlet valve body 31 can be fitted onto the outer wall or the inner wall of the inner tube of the connector.

[0087] In this embodiment, the liquid inlet valve body 31 is fitted onto the inner wall of the inner tube 143 of the connector and has a liquid inlet hole 32.

[0088] Example 2 of differential pressure inlet valve core:

[0089] like Figure 3 As shown, the differential pressure inlet valve core 3 includes an inlet valve body 31, an inlet valve plate 33, and an inlet spring 34 installed at the inlet end of the inner main channel. An inlet hole 32 is provided at the end of the inlet valve body 31.

[0090] In this embodiment, the inlet valve body 31 is fitted onto the outer wall of the inner tube of the connector 14, forming an installation space directly with the inner tube. An inlet valve plate 33 and an inlet spring 34 are disposed within this installation space. One end of the inlet spring 34 abuts against the inlet valve plate 33, and the other end abuts against the end of the inner tube 143. The inlet valve plate 33 is umbrella-shaped, including an umbrella portion 332 and a stem portion 333. The diameter of the umbrella portion 332 is larger than the inner diameter of the inlet hole 32, and the diameter of the stem portion 333 is adapted to the inner diameter of the inlet hole 32, so that the stem portion 333 of the inlet valve plate 33 is disposed within the inlet hole 32, while the umbrella portion 332 abuts against the end face of the inlet hole 32.

[0091] When liquid enters the inner flow channel, the water pressure overcomes the inlet spring 34, pushing the inlet valve plate 33 to open the inlet hole 32, thus enabling liquid entry. The rod 333 is cross-shaped and typically moves along the inlet hole 32, providing guidance without hindering the liquid entry process.

[0092] In order to open the inlet valve plate 33 better, the inlet valve plate 33 is provided with an inlet guide channel 35 that is connected to the inside and outside. The inlet guide channel 35 consists of several guide holes set on the umbrella part 332. The guide holes are connected to the inlet end of the pipeline through the gap of the rod part 333. The gap of the rod part 333 is the space generated between the cross-shaped structures.

[0093] In this embodiment, the purpose of the differential pressure inlet valve core is to generate a pressure difference between the inner and outer flow channels. However, this pressure difference does not need to be large. Therefore, the elastic coefficient of the inlet spring 34 is relatively small.

[0094] In addition, in order to control the length of the installation space, a bracket connection part 334 is provided on the outside of the liquid inlet valve body 31 in this embodiment. The bracket connection part 334 has an outer ring and a connecting strip connecting the outer ring and the liquid inlet valve plate 33. The outer edge of the outer ring is provided with an external thread that connects to the threaded mounting end 142 of the end pipe connector 14. Through the threaded connection, the liquid inlet valve body 31 can be effectively fixed, while not affecting the liquid inlet of the external flow channel.

[0095] By rotating the bracket connecting part 334, the position of the inlet valve body 31 can be precisely adjusted, thereby changing the effect of the inlet spring 34 on the inlet valve plate 33 and affecting the pressure difference between the inner and outer flow channels. Relatively speaking, the greater the effect of the inlet spring 34 on the inlet valve plate 33, the greater the pressure difference generated between the inner and outer flow channels, and the faster the flow from the outer flow channel to the inner flow channel.

[0096] Example 3 of differential pressure inlet valve core:

[0097] like Figure 4As shown, the structure of this embodiment is basically the same as that of Embodiment 2 of the differential pressure inlet valve core, except that: the bracket connecting part 334 is movably disposed on the inner wall of the main inlet valve 7, and an adapter spring 36 is provided between the bracket connecting part 334 and the valve body of the main inlet valve 7. When the main inlet valve 7 is installed, the differential pressure inlet valve core can adaptively reach the specified installation position through the adapter spring 36, realizing dynamic installation.

[0098] Example 4 of differential pressure inlet valve core:

[0099] like Figure 5-6 As shown, the differential pressure inlet valve core 3 includes an inlet valve body 31, an inlet valve plate 33, an inlet spring 34, and an outer ring fixing ring 37 installed at the inlet end of the inner main channel.

[0100] The sidewall of the inlet valve body 31 is embedded in the inner wall of the inner tube of the end pipe connector 14, and a plurality of inlet holes 32 are circumferentially opened at its outer end. The inlet valve plate 33 is movably disposed on the outside of the inlet valve body 31 and is used to open / seal the inlet holes 32. One end of the inlet spring 34 abuts against the inner wall step portion of the inlet valve plate 33, and the other end abuts against the outer wall step portion of the inner main channel.

[0101] Preferably, the end of the inlet valve body 31 is provided with an inlet guide channel 35 that connects the inside and outside. In this embodiment, the inlet guide channel 35 is preferably a small inlet hole. When the outlet end 21 of the pipeline is relatively open, the inlet hole 32 is not open, and the inner flow channel can be filled through the inlet guide channel 35, which is conducive to the rapid generation of liquid flow in the inner flow channel and prepares for the formation of a pressure difference between the inner and outer flow channels.

[0102] In order for the inlet valve plate 33 to open the inlet hole 32, the inlet valve plate 33 also has an outer extension 331. The outer extension 331 is preferably an annular outward flange structure perpendicular to the main body of the inlet valve plate 33. The outer extension 331 is located inside the outer main channel. When water flow is generated in the outer main channel, the inlet valve plate 33 can be moved through the outer extension 331, thereby opening the inlet hole 32 of the inner main channel. In this embodiment, the greater the water flow in the outer main channel, the larger the area of ​​the inlet hole 32 that is opened, and the greater the liquid inflow in the inner main channel, which is beneficial for large-flow liquid discharge.

[0103] To allow the water flow in the main channel to better drive the inlet valve plate 33 to move, an outer ring fixing ring 37 is provided in the threaded mounting end 142 of the end pipe connector 14. The outer ring fixing ring 37 is annular, with external threads on its outer side and a retaining ring portion 371 on its inner side. The retaining ring portion 371 is annular, with its inner diameter being the same as the outer diameter of the outer extension portion 331, but it is offset from the outer extension portion 331 and located in front of the outer extension portion 331. This creates a bent channel between the retaining ring portion 371 and the outer extension portion 331. When the water at the inlet end flows along the pipeline, most of the water will continuously act on the outer extension portion 331, thereby effectively pushing the inlet valve plate 33 to move and opening the inlet hole 32.

[0104] To prevent the inlet valve plate 33 from detaching from the inlet valve body 31, a limiting structure 311 is provided at the end of the inlet valve body 31. The limiting structure 311 can be a snap ring or a limiting protrusion.

[0105] The advantages of using the differential pressure inlet valve core in this embodiment are:

[0106] 1. When the water output at the outlet end 21 of the pipeline is relatively small, if the inlet valve plate 33 does not move and the inlet hole 32 is not opened, liquid can be introduced through the inlet guide channel 35 to allow liquid to exit the inner flow channel and generate a pressure difference between the inner and outer flow channels.

[0107] 2. When the water flow at the outlet end 21 of the pipeline is relatively large, the inlet valve plate 33 moves a large distance, and the inlet hole 32 opens a larger area, which is conducive to the inlet of liquid into the inner flow channel, thereby ensuring the liquid flow rate of the inner and outer flow channels at the outlet end 21 of the pipeline. At the same time, the pressure difference between the inner and outer flow channels still exists.

[0108] Differential pressure discharge valve core

[0109] The differential pressure outlet valve core 4 is installed at the outlet end 21 of the branch line 2, that is, inside the end pipe joint 14.

[0110] Example 1 of differential pressure outlet valve core:

[0111] like Figure 7 As shown, the differential pressure outlet valve core 4 includes an outlet support frame 41 and an outlet valve plate 42 disposed on the outlet support frame 41. In order not to affect the liquid flow in the inner and outer channels, the outlet support frame 41 is an annular hollow frame made of rigid plastic or metal. One end of the outlet support frame 4 is provided with an external thread for connecting the threaded mounting end 142 of the end pipe connector 14, and the other end is provided with an outlet valve plate 42. The outlet valve plate 42 is an annular diaphragm made of soft plastic or rubber and is disposed at the outlet end of the outer branch channel.

[0112] Specifically, the inner wall of the outer tube of the end pipe connector 14 is provided with a first mounting surface 1441, and the outer wall of the inner tube is provided with a second mounting surface 1431. The outer ring of the liquid outlet valve plate 42 abuts against the first mounting surface 1441 under the action of the liquid outlet support frame 4, and the inner ring of the liquid outlet valve plate 42 abuts against the second mounting surface 1431. When the external flow channel needs to discharge liquid, the liquid outlet valve plate 42 deforms, causing its inner ring to leave the second mounting surface 1431, thereby opening the liquid outlet end of the external flow channel.

[0113] When there is no water flow, the outlet valve plate 42 rests against the outlet end of the outer flow channel of the end pipe joint 14 due to its elasticity. When liquid flows out of the outer flow channel, the outlet valve plate 42 deforms and opens the outer flow channel.

[0114] To achieve zero-resistance water flow from the outer channel to the inner channel, at least one outlet guide channel 43 is provided at the end of the outlet valve plate 42. When the outlet valve plate 42 seals the outer channel of the pipe joint 14, the outlet guide channel 43 can function as a connection between the inside and outside. This ensures that even in branches where no liquid is being discharged, a small amount of liquid can flow as long as there is a slight pressure difference between the inner and outer channels.

[0115] Example 2 of differential pressure outlet valve core:

[0116] like Figure 8 As shown, this embodiment is basically the same as Embodiment 1 of the differential pressure outlet valve core, except that:

[0117] The water outlet device 5 is a liquid outlet control valve 51. The liquid outlet control valve 51 is provided with an inlet end, an outlet end and a control end. The control end is provided with a liquid outlet control valve core and a handle. The liquid outlet control valve core controls the opening and closing between its inlet end and outlet end.

[0118] The liquid outlet support frame 41 has a liquid outlet mounting part 411 at one end, and the liquid outlet valve plate 42 is provided at the other end of the liquid outlet support frame 41. The liquid outlet mounting part 411 is mounted on the liquid inlet end of the liquid outlet control valve 51 by means of a fine-tuning spring 511.

[0119] Specifically, the liquid outlet mounting part 411 is a guide protrusion provided on the outside of the liquid outlet support frame 41, and the liquid outlet control valve 51 is provided with a corresponding guide groove 512 at the liquid inlet end. The liquid outlet support frame 41 is movably disposed in the guide groove 512 of the liquid outlet control valve 51 through the guide protrusion.

[0120] Preferably, the liquid outlet mounting part 41 is provided with a plurality of slotted grooves 41 at the end of the liquid outlet support frame 41, which facilitates reducing the volume of the end of the liquid outlet support frame 41 and is conducive to installing the liquid inlet end of the smaller liquid outlet control valve 51, thereby realizing the connection between the guide protrusion and the guide groove 512.

[0121] The liquid outlet mounting part 411 is mounted on the liquid inlet end of the liquid outlet valve body 51 via a fine-tuning spring 511. One end of the fine-tuning spring 511 abuts against the liquid outlet mounting part 411, and the other end abuts against the inner wall step of the liquid outlet valve body 51. Since the liquid inlet end of the liquid outlet valve body 51 is mounted on the end pipe connector 14 via a threaded connection, the installation distance may vary, which directly affects the position of the differential pressure liquid outlet valve core 4. If the liquid outlet valve body 51 is installed too deep, the differential pressure liquid outlet valve core 4 will be cracked; if the liquid outlet valve body 51 is not installed deep enough, the sealing performance of the differential pressure liquid outlet valve core 4 will be affected. In this embodiment, the fine-tuning spring 511 can adaptively adjust the position of the differential pressure liquid outlet valve core, so that the liquid outlet support frame 41 always abuts against the second mounting surface 1431, and is not affected by the installation angle of the liquid outlet valve body 51.

[0122] Example 3 of differential pressure outlet valve core:

[0123] like Figure 9 As shown, this embodiment is basically the same as Embodiment 1 of the differential pressure outlet valve core, except that:

[0124] The differential pressure outlet valve core 4 includes an outlet support frame 41 and an outlet valve plate 42 disposed on the outlet support frame 41. To avoid affecting the liquid flow in the inner and outer channels, the outlet support frame 41 is an annular hollow frame made of rigid plastic or metal. One end of the outlet support frame 41 has an external thread for connecting to the threaded mounting end 142 of the end pipe connector 14. The outlet valve plate 42 is disposed in the middle, and is an annular diaphragm made of soft plastic or rubber, disposed at the outlet end of the outer branch channel. The other end of the outlet support frame 41 is mounted on the inner pipe 142 of the end pipe connector 14.

[0125] Specifically, the inner wall of the outer tube of the end pipe connector 14 has a first mounting surface 1441, and the outer wall of the inner tube 143 has a second mounting surface 1431. The inner ring of the liquid outlet valve plate 42 is installed in the middle of the liquid outlet support frame 41, and the connecting end of the liquid outlet support frame 41 is located on the second mounting surface 1431. The outer ring of the liquid outlet valve plate 42 abuts against the first mounting surface 1441. When liquid needs to be discharged from the external flow channel, the liquid outlet valve plate 42 deforms, causing its outer ring to move away from the first mounting surface 1441, thereby opening the liquid outlet end of the external flow channel.

[0126] To achieve zero-resistance water flow from the outer channel to the inner channel, the outer ring of the outlet valve plate 42 is provided with at least one outlet guide channel 43. When the outlet valve plate 42 seals the outer channel of the pipe joint 14, the outlet guide channel 43 can function as a connection between the inside and outside. This ensures that even in branches where no liquid is being discharged, a small amount of liquid can flow as long as there is a slight pressure difference between the inner and outer channels.

[0127] Example 4 of differential pressure outlet valve core:

[0128] like Figure 10 As shown, this embodiment is basically the same as Embodiment 3 of the differential pressure outlet valve core, except that:

[0129] The water outlet device 5 is a liquid outlet control valve 51.

[0130] The liquid outlet support frame 41 has a liquid outlet mounting part 411 at one end, and the liquid outlet valve plate 42 is provided at the other end of the liquid outlet support frame 41. The liquid outlet mounting part 411 is mounted on the liquid inlet end of the liquid outlet control valve 51 by means of a fine-tuning spring 511.

[0131] Specifically, the liquid outlet mounting part 411 is a guide protrusion provided on the outside of the liquid outlet support frame 41, and the liquid outlet control valve 51 is provided with a corresponding guide groove 512 at the liquid inlet end. The liquid outlet support frame 41 is movably disposed in the guide groove 512 of the liquid outlet control valve 51 through the guide protrusion.

[0132] Preferably, the liquid outlet mounting part 411 is provided with a plurality of slotted grooves 412 at the end of the liquid outlet support frame 41. The slotted grooves 412 are arranged along the axial direction of the liquid outlet support frame 41, which facilitates reducing the volume of the end of the liquid outlet support frame 41 and is conducive to installing the liquid inlet end of the smaller liquid outlet control valve 51, so as to realize the connection between the guide protrusion and the guide groove 512.

[0133] The liquid outlet mounting part 411 is mounted on the liquid inlet end of the liquid outlet control valve 51 via a fine-tuning spring 511. One end of the fine-tuning spring 511 abuts against the liquid outlet mounting part 411, and the other end abuts against the inner wall step of the liquid outlet control valve 51. When the liquid outlet control valve 51 is installed, the fine-tuning spring 511 can adaptively adjust the position of the differential pressure liquid outlet valve core.

[0134] Example 5 of differential pressure outlet valve core:

[0135] like Figure 11 As shown, this embodiment is basically the same as Embodiment 1 of the differential pressure outlet valve core, except that:

[0136] The differential pressure outlet valve core 4 includes an outlet support frame 41, an outlet valve plate 42 and an outlet spring 44 disposed on the outlet support frame 41, with the outlet spring 44 positioned between the outlet support frame 41 and the outlet valve plate 42. The outlet valve plate 42 is made of a rigid material and seals the external flow channel through the outlet spring 44. When liquid flows out of the external flow channel, the outlet spring 44 is compressed, causing the outlet valve plate 42 to move and open the external flow channel.

[0137] The liquid outlet support frame 41 is an annular hollow frame made of rigid plastic or metal. One end of the liquid outlet support frame 41 is provided with an external thread for connecting the threaded mounting end 142 of the end pipe connector 14, and the inner wall of the other end is provided with a liquid outlet valve plate 42, which is located at the liquid outlet end of the outer branch flow channel.

[0138] For ease of installation, a guide groove 413 is provided on the side wall of the liquid outlet support frame 41, and an outwardly extending guide portion 421 is provided on the guide end of the liquid outlet valve plate 42. The guide portion is a protrusion and is provided in the corresponding guide groove 413.

[0139] The inner ring of the liquid outlet valve plate 42 is provided with at least one liquid outlet guide channel 43.

[0140] Example 6 of differential pressure discharge valve core:

[0141] like Figure 12 As shown, this embodiment is basically the same as Embodiment 5 of the differential pressure outlet valve core, except that:

[0142] The liquid outlet support frame 41 is integrally formed on the liquid outlet control valve 51 at the liquid inlet end, and is movably disposed on the liquid outlet control valve 51 at the liquid inlet end via the liquid outlet spring 44.

[0143] Example 7 of differential pressure discharge valve core:

[0144] like Figure 13-15 As shown, this embodiment is basically the same as Embodiment 5 of the differential pressure outlet valve core, except that:

[0145] The differential pressure outlet valve core 4 includes an outlet support frame 41, an outlet valve plate 42 and an outlet spring 44 disposed on the outlet support frame 41, and the outlet spring 44 is disposed between the outlet support frame 41 and the outlet valve plate 42.

[0146] The liquid outlet valve plate 42 is fitted onto the outer side wall of the liquid outlet support frame 41.

[0147] Example 8 of differential pressure outlet valve core:

[0148] like Figure 16-17 As shown, this embodiment is basically the same as Embodiment Seven of the differential pressure outlet valve core, except that:

[0149] The liquid outlet support frame 41 has a liquid outlet mounting part 411 at one end, and the liquid outlet valve plate 42 is provided at the other end of the liquid outlet support frame 41. The liquid outlet mounting part 411 is mounted on the liquid inlet end of the liquid outlet control valve 51 by means of a fine-tuning spring 511.

[0150] [Concealed Differential Pressure Discharge Valve Core]

[0151] Example 1 of a concealed differential pressure outlet valve core:

[0152] like Figure 18 , 20 As shown, a concealed differential pressure outlet valve core and a common connector 23 are provided on the branch 2. The concealed differential pressure outlet valve core is installed on the branch 2 through a three-way pipe connector 22 and is located inside the wall to increase the resistance of the outflow channel. The common connector 23 is located outside the wall and is used to directly install water outlet equipment 5 such as shower heads.

[0153] The three-way pipe connector 22 includes two connector mounting parts 221 for connecting the pipe-in-pipe and a valve assembly part 222 for installing the differential pressure outlet valve core 4. The connector mounting part 221 is equivalent to the pipe-in-pipe mounting end. A connector inner pipe is provided between the two connector mounting parts 221 for connecting the inner flow channel 12 of the branch. A partition part 224 is provided on the outside of the connector inner pipe, dividing the outer flow channel into two parts. The partition part 224 is located inside the valve assembly part 222, so that the valve assembly part 222 is provided with partition holes 223 that respectively connect to the outer flow channels 13 of the corresponding connector mounting parts 221. The two parts are interconnected through the valve assembly part 222.

[0154] The liquid outlet support frame 41 is similar to a valve cover, which is sealed on the valve assembly part 222 and installs the liquid outlet valve plate 42 and the liquid outlet spring 44 inside the valve assembly part 222. One end of the liquid outlet spring 44 abuts against the liquid outlet valve plate 42 and the other end abuts against the liquid outlet support frame 41.

[0155] The liquid outlet valve plate 42 has an annular guide sidewall portion and a sealing bottom located at one end of the guide sidewall portion. The guide sidewall portion extends into the inner cavity of the liquid outlet support frame 41 and moves along the inner wall of the liquid outlet support frame 41. The sealing bottom is a plane. The sealing bottom of the liquid outlet valve plate 42 is provided on at least one of the partition holes 223 and is used to restrict the liquid flow in the outer channel.

[0156] The sealing bottom in this embodiment mainly seals a partition hole 223, such as Figure 20As shown, it mainly seals the left-side partition hole 223. To facilitate the reverse flow of the outer channel, a liquid outlet guide channel 43 is provided at the bottom of the seal. The liquid outlet guide channel 43 is an opening that faces the other partition hole 223, namely the right-side partition hole 223. At the same time, a part of the liquid outlet guide channel 43 is also located in the left-side partition hole 223, thus forming a small backflow channel.

[0157] Example 2 of a concealed differential pressure outlet valve core:

[0158] like Figure 21 As shown, the structure of this embodiment is basically the same as that of Embodiment 1 of the concealed differential pressure outlet valve core, except that:

[0159] The sealing bottom of the liquid outlet valve plate 42 can directly seal the two partition holes 223, but the liquid outlet guide channel 43 is provided on the outer side of the sealing bottom corresponding to the partition. The liquid outlet guide channel 43 is a groove. When the liquid outlet valve plate 42 is closed, the groove can connect the two partition holes 223 to achieve reverse backflow.

[0160] Since a closed inner cavity is formed between the liquid outlet valve plate 42 and the liquid outlet support frame 41, in order not to affect the movement of the liquid outlet valve plate 42, the liquid outlet valve plate 42 is provided with a balance hole 422 that connects the closed inner cavity and the outer flow channel.

[0161] Example 3 of a concealed differential pressure outlet valve core:

[0162] like Figure 22 As shown, the structure of this embodiment is basically the same as that of Embodiment 1 of the concealed differential pressure outlet valve core, except that:

[0163] The diameter of the liquid outlet valve plate 42 is adapted to the diameter of a partition hole 223, and is movably mounted on the partition hole 223 on the left side, thereby increasing the resistance to liquid outlet.

[0164] [Visualized water outlet valve]

[0165] Example 1 of a visualized water outlet valve:

[0166] The water outlet device 5 is equipped with a visual water outlet valve 52, which includes a water outlet valve body 521. The water outlet valve body 521 has a first inlet end, a first outlet end, and a first control end connecting the two. A water outlet control valve core is provided inside the first control end. A viewing window is provided on the side wall of the first inlet end. The viewing window has multiple circumferentially arranged small holes. A viewing seal 522 is provided inside the viewing window. The viewing seal 522 is made of transparent glass or plastic. A water flow visibility object 523 is provided inside the viewing seal 522. When water flows through, the water flow visibility object 523 will move accordingly.

[0167] The transparent sealing element 522 can be integrally formed inside the transparent window, or it can be installed on the water outlet valve body 521 by means of threaded connection and sealed by a sealing ring.

[0168] Specifically, the transparent sealing element 522 is annular and has a sealing section and an external threaded connection section. An internal threaded connection portion is provided on the inner wall of the first liquid inlet end. The transparent sealing element 522 is fixed to the internal threaded connection portion via the external threaded connection section, and the sealing section is positioned on the inner wall of the outlet valve body 521 where the transparent window is located. Sealing rings 527 are provided at both the upper and lower positions on the inner wall of the outlet valve body 521 where the transparent window is located. The sealing rings 527 abut against the sealing section of the outlet valve body 521 and the transparent sealing element 522 to prevent leakage from the transparent window.

[0169] like Figure 23 As shown, the visible water flow 523 is strip-shaped, one end of which can be fixed to the outlet valve body 521, or fixed near the pipeline where the outlet valve body 521 is installed; the other end can move freely with the water flow.

[0170] The water flow visibility object 523 may also be equipped with markings that can attract the user's attention, such as reflective markings.

[0171] The water flow visibility 523 is better designed in a spiral or S-shape. When water flows over it, the water flow visibility 523 will shake, making it easier to observe the presence of water flow.

[0172] Example 2 of a visualized water outlet valve:

[0173] like Figure 24 As shown, the structure of this embodiment is basically the same as that of the first embodiment of the visualized water outlet valve, except that:

[0174] The visible water flow element 523 is a marker wheel.

[0175] Specifically, the first liquid inlet end of the water outlet valve body 521 is provided with a visible object mounting bracket 524, and a drive shaft 525 is rotatably provided in the middle of the visible object mounting bracket 524. One end of the drive shaft 525 is located inside the first liquid inlet end and is provided with the marking wheel. The other end of the drive shaft 525 is located at the liquid outlet end of the branch and is provided with a power impeller 526.

[0176] In this embodiment, the power impeller 526 is located near the liquid outlet end of the inner flow channel 12 of the branch. When there is liquid flow at the liquid outlet end, the power impeller 526 rotates, thereby driving the indicator wheel to rotate, making it convenient for the user to observe.

[0177] [Main inlet valve with built-in differential pressure inlet valve core]

[0178] like Figure 25 As shown, this embodiment provides a main water inlet valve 7 with a built-in differential pressure inlet valve core, which replaces the above-mentioned main water inlet valve 7, end pipe joint 14 and differential pressure inlet valve core 3, thereby making installation more convenient.

[0179] The main inlet valve 7 is a shut-off valve, which includes a shut-off valve body 71, a shut-off valve cover 72, a shut-off valve core 73, and a built-in differential pressure inlet valve core.

[0180] The shut-off valve body 71 is T-shaped and has a main inlet end 711 connected to the tap water pipe, a main control end 712 for installing the shut-off valve core 73, and a main outlet end 713 connected to the pipe-in-pipe.

[0181] A cut-off inner tube 714 is provided between the main control terminal 712 and the main liquid outlet 713, thereby forming the inner flow channel and the outer flow channel. The main liquid inlet 711 is connected to the liquid inlet of the inner and outer flow channels through the main control terminal 712.

[0182] The main control terminal 712 is threadedly connected to a stop valve cover 72, and a sealing ring is provided between the two.

[0183] The shut-off valve core 73 includes a connecting rod 731 rotatably mounted on the shut-off valve cover 72, a handwheel 732 fixed to the outer end of the connecting rod 731, a lifting platform 733 mounted on the inner end of the connecting rod 731, and a sealing gasket 734 mounted on the bottom surface of the lifting platform 733. The sealing gasket 734 is fixed to the lifting platform 733 by screws. When the handwheel 732 and the connecting rod 731 rotate, the lifting platform 733 will rise and fall, and the sealing gasket 734 will seal / open the inner and outer flow channels of the main control end 712, thereby controlling the liquid inlet of the main liquid inlet end 711.

[0184] The structure of the built-in differential pressure inlet valve core is basically the same as that of the differential pressure inlet valve core described above, and it is installed at the inlet end of the inner flow channel of the main control terminal 712.

[0185] In this embodiment, the differential pressure inlet valve core includes an inlet valve body 31, an inlet valve plate 33, and an inlet spring 34. The inlet valve body 31 is threadedly connected to the inner wall of the inlet end of the inner flow channel. One end of the inlet spring 34 abuts against the stepped surface of the inlet end of the inner flow channel, and the other end abuts against the inlet valve plate 33, thereby sealing the inlet hole 32 of the inlet valve body 31.

[0186] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A differential pressure pipe-in-pipe liquid outlet pipeline system, characterized in that, include: The main pipeline (1) has an inner main channel and an outer main channel, and the inlet ends of the inner main channel and the outer main channel are interconnected to form the pipeline inlet end (11). Several branch lines (2) are distributed on the main pipeline (1) and have inner branch flow channels and outer branch flow channels. The ends of the inner branch flow channels and the outer branch flow channels are interconnected to form the liquid outlet end (21) of the pipeline. The inner branch flow channels and the inner main flow channel are interconnected to form an inner flow channel (12), and the outer branch flow channels and the outer main flow channel are interconnected to form an outer flow channel (13). Differential pressure inlet valve core (3) is provided at the inlet end (11) of the pipeline to increase the inlet resistance of the inlet end of the inner main channel; Several differential pressure discharge valve cores (4) are installed on the corresponding branch (2) to increase the discharge resistance at the discharge end of the outer branch flow channel; as well as Several water outlet devices (5) are installed at the corresponding liquid outlet end (21) of the pipeline; When the water outlet device (5) of one or more branches (2) is opened, a pressure difference will be generated between the inner flow channel (12) and the outer flow channel (13). The pressure of the outer flow channel (13) will be higher than the pressure of the inner flow channel (12), so that in the other branches (2), the liquid in the outer flow channel (13) can flow back to the inner flow channel (12) through the corresponding pipe outlet end (21), and finally flow out through the pipe outlet end (21) of the water outlet device (5).

2. The differential pressure pipe-in-pipe liquid outlet pipeline system according to claim 1, characterized in that: The differential pressure inlet valve core (3) includes an inlet valve body (31), an inlet valve plate (33), and an inlet spring (34) installed at the inlet end of the inner main channel. The inlet valve body (31) has at least one inlet hole (32). The inlet valve plate (33) is movably disposed on the inlet hole (32) by the inlet spring (34).

3. The differential pressure pipe-in-pipe liquid outlet pipeline system according to claim 2, characterized in that: The inlet valve plate (33) or the inlet valve body (31) is provided with an inlet guide channel (35) that connects the inside and outside.

4. The differential pressure pipe-in-pipe liquid outlet pipeline system according to claim 2, characterized in that: The liquid inlet hole (32) is opened on the side wall of the liquid inlet valve body (31), and the liquid inlet valve plate (33) is movably disposed on the outside of the liquid inlet valve body (31) and is used to open / seal the liquid inlet hole (32); One end of the inlet spring (34) abuts against the inlet valve plate (33), and the other end abuts against the outer wall of the inner main channel; The inlet valve plate (33) also has an outer extension (331) located inside the outer main channel. When water flows through the outer main channel, the inlet valve plate (33) can be moved by the outer extension (331) and the inlet hole (32) of the inner main channel can be opened.

5. A differential pressure pipe-in-pipe liquid outlet pipeline system according to claim 1, characterized in that: The differential pressure outlet valve core (4) includes an outlet support frame (41) and an outlet valve plate (42) disposed on the outlet support frame (41). The outlet valve plate (42) is disposed at the outlet end of the outer branch flow channel, and at least one outlet guide channel (43) is provided at the end of the outlet valve plate (42).

6. A differential pressure pipe-in-pipe liquid outlet pipeline system according to claim 5, characterized in that: The differential pressure outlet valve core (4) also includes an outlet spring (44), which is disposed between the outlet support frame (41) and the outlet valve plate (42).

7. A differential pressure pipe-in-pipe liquid outlet pipeline system according to claim 5, characterized in that: The water outlet device (5) is a liquid outlet control valve (51). The liquid outlet support frame (41) has a liquid outlet mounting part (411), which is mounted on the liquid inlet end of the liquid outlet control valve (51) by means of a fine-tuning spring (511).

8. A differential pressure pipe-in-pipe liquid outlet pipeline system according to claim 6, characterized in that: The branch (2) is provided with a three-way pipe joint (22), which includes two joint mounting parts (221) for connecting the inner pipes of the pipes and a valve assembly part (222) for installing the differential pressure outlet valve core (4). An inner pipe is provided between the two joint mounting parts (221) for connecting the inner flow channel (12). The valve assembly part (222) is provided with a partition hole (223) that connects to the outer flow channel (13) of the corresponding joint mounting part (221). The liquid outlet support frame (41) is sealed on the valve assembly (222), and its liquid outlet valve plate (42) is disposed on at least one of the partition holes (223).

9. A differential pressure pipe-in-pipe liquid outlet pipeline system according to claim 1, characterized in that: A water pump (6) is installed on the main pipeline (1) or branch pipeline (2). The inlet end of the water pump (6) is connected to the outer flow channel (13), and the outlet end of the water pump (6) is connected to the inner flow channel (12). A check valve (61) is also provided.

10. A differential pressure pipe-in-pipe liquid outlet pipeline system according to claim 1, characterized in that: The water outlet device (5) is equipped with a visual water outlet valve (52), which includes a water outlet valve body (521). The water outlet valve body (521) has a first liquid inlet end, a first liquid outlet end, and a first control end connecting the two. A water outlet control valve core is provided in the first control end. A viewing window is provided on the side wall of the first liquid inlet end. A viewing seal (522) is provided in the viewing window. A water flow visibility object (523) is provided in the viewing seal (522). When water flows through, the water flow visibility object (523) will move accordingly.

Images