A pipe return box

Abstract

The utility model provides a kind of pipeline reflux box, it is related to chemical conveying technical field.The utility model provides a kind of pipeline reflux box, the pipeline reflux box includes box and the conveying pipeline, reflux pipeline, pressure sensor and reflux valve in box.The pressure sensor is used to detect the pressure in conveying pipeline, when pressure exceeds set value, reflux valve is automatically opened, to make part of medium reflux to liquid supply end, to reduce pipeline pressure;When pressure returns to normal, reflux valve is automatically closed, to ensure that medium continues to flow to using equipment.It can be understood that the above setting realizes the automatic regulation of pipeline pressure, effectively reduces the risk of medium leakage due to overpressure, reduces the number of downtime and manual intervention, improves the continuity, stability and production efficiency of system operation.

Description

Technical Field

[0001] This utility model relates to the field of chemical transportation technology, and more specifically, to a pipeline return box. Background Technology

[0002] During the transportation of chemicals, pipelines are prone to liquid leakage due to excessively high transportation pressure, posing a significant safety hazard.

[0003] However, the inventors discovered that existing technologies mainly rely on pressure sensor alarms to shut down the system and require manual troubleshooting, resulting in frequent system shutdowns, long recovery times, and low production efficiency. Utility Model Content

[0004] This utility model provides a pipeline reflux box, which can automatically activate the reflux function when the pipeline pressure is too high, and return some chemicals, thereby effectively reducing the pressure in the pipeline, avoiding leakage problems that may be caused by excessive pressure, thereby reducing the number of system downtimes and improving operational stability and production efficiency.

[0005] According to an embodiment of the present invention, a pipe return box includes a box body and a delivery pipe, a return pipe, a pressure sensor, and a return valve disposed within the box body. The box body is provided with a liquid supply interface, a usage interface, and a return interface; the delivery pipe is disposed within the box body, with one end connected to the liquid supply interface and the other end connected to the usage interface. A return pipe is located inside the housing, with one end connected to the delivery pipe and the other end connected to the return port; a pressure sensor is connected to the delivery pipe and is used to detect the pressure in the delivery pipe; a return valve is located on the return pipe and is used to open when the pressure in the delivery pipe exceeds a set value, so that the delivery pipe is connected to the return port.

[0006] According to an embodiment of this utility model, the pipeline return box has one end of a delivery pipeline connected to a liquid supply interface and the other end connected to a usage interface, used to deliver liquid or fluid media from the liquid supply equipment to the usage equipment. One end of a return pipeline is connected to the delivery pipeline, and the other end is connected to the return interface, forming a return channel for returning a portion of the media. A pressure sensor is used to detect the pressure in the delivery pipeline. When the pressure exceeds a set value, the return valve automatically opens, allowing a portion of the media to return to the liquid supply end, thereby reducing the pipeline pressure. When the pressure returns to normal, the return valve automatically closes, ensuring that the media continues to flow to the usage equipment.

[0007] Understandably, the above settings enable automatic regulation of pipeline pressure, effectively reducing the risk of media leakage caused by overpressure, reducing the number of downtimes and manual intervention, and improving the continuity, stability and production efficiency of system operation. Attached Figure Description

[0008] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the structure of the pipe return box provided in this embodiment; Figure 2 This is another structural schematic diagram of the pipe return box provided in this embodiment; Figure 3 This is another structural schematic diagram of the pipe return box provided in this embodiment.

[0010] Icons: 10-Pipeline reflux box; 30-Liquid supply equipment; 50-Using equipment; 100-Box body; 110-Liquid supply interface; 120-Using interface; 130-Reflux interface; 300-Transport pipeline; 310-First regulating valve; 330-Second regulating valve; 500-Reflux pipeline; 510-Reflux valve; 530-Reflux branch; 700-Detection pipeline; 710-Pressure sensor; 730-Third regulating valve; 910-Leakage sensor; 920-Waste discharge pipeline; 930-Waste discharge valve. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0012] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0013] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0014] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0015] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0016] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0017] The following describes in detail the overall structure, working principle, and technical effects of the pipeline return box provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0018] Please see Figure 1 This utility model provides a pipeline return box 10, which is applied in the field of chemical transportation technology. It can automatically activate the return function when the pipeline pressure is too high, so as to return some of the chemicals, thereby effectively reducing the pressure in the pipeline, avoiding leakage problems that may be caused by excessive pressure, thereby reducing the number of system shutdowns and improving operational stability and production efficiency.

[0019] The pipeline return box 10 includes a box body 100 and a delivery pipe 300, a return pipe 500, a pressure sensor 710, and a return valve 510 disposed within the box body 100. The box body 100 is equipped with a liquid supply port 110, a usage port 120, and a return port 130. One end of the delivery pipe 300 is connected to the liquid supply port 110, and the other end is connected to the usage port 120, for delivering liquid or fluid media from the liquid supply device 30 to the usage device 50. One end of the return pipe 500 is connected to the delivery pipe 300, and the other end is connected to the return port 130, forming a return channel for returning a portion of the media.

[0020] Based on this, pressure sensor 710 is connected to delivery pipe 300 to detect the pressure in delivery pipe 300. Return valve 510 is installed on return pipe 500 to automatically control the opening and closing of return pipe 500 according to pressure changes in delivery pipe 300.

[0021] Specifically, the reflux valve 510 is used to open when the pressure in the delivery pipeline 300 exceeds a set value, thereby connecting the delivery pipeline 300 to the reflux port 130. This allows a portion of the medium in the delivery pipeline 300 to flow back through the reflux pipeline 500 to the device connected to the reflux port 130, thus rapidly reducing the pressure in the delivery pipeline 300 and achieving automatic pressure regulation. Furthermore, the reflux valve 510 can also be used to close when the pressure in the delivery pipeline 300 does not exceed the set value, thereby preventing the delivery pipeline 300 from connecting to the reflux port 130 and ensuring the normal flow of the medium to the user equipment 50.

[0022] As described above, when the pressure in the conveying pipeline 300 exceeds a set value, the pipeline return box 10 provided by this utility model can open the return valve 510, allowing some of the medium to flow back to the device connected to the return port 130, thereby reducing the pipeline pressure. This return pressure reduction mechanism effectively avoids frequent system shutdowns and medium leakage caused by overpressure, reduces the need for manual intervention, shortens fault recovery time, and thus significantly improves the continuity, stability, and overall production efficiency of the system operation.

[0023] In practical applications, chemicals flow along the delivery pipeline 300 to the user equipment 50 under pump pressure provided by the supply device 30. Due to pressure loss and local resistance along the pipeline, the pressure gradually decreases from the starting point to the end point of delivery. Therefore, the fluid pressure at the outlet of the supply device 30 is the maximum value in the system, while the pressure at the inlet of the user equipment 50 is relatively the lowest.

[0024] Based on this pressure distribution characteristic, this invention places the pipeline return box 10 at the end of the delivery pipeline 300 closest to the liquid supply device 30, i.e., the area with the highest pressure. This arrangement allows the pressure sensor 710 to monitor the maximum pressure value during the delivery process in real time. When the pressure exceeds a set threshold, the return valve 510 is promptly triggered to open, allowing some of the medium to return to the liquid supply end or the recovery system via the return pipeline 500. This effectively reduces the pressure inside the pipeline and prevents safety risks such as leakage and pipe bursts caused by overpressure.

[0025] Furthermore, both the supply port 110 and the return port 130 are used to connect to the supply device 30. Specifically, the supply port 110 is used to introduce fluid from the external supply device 30 into the delivery pipe 300, while the return port 130 is used to return the medium in the return pipe 500 back to the supply device 30, thereby forming a closed-loop pressure regulation and medium circulation system.

[0026] In other embodiments, the return port 130 may also be connected to other types of devices, such as buffer tanks or recovery devices, for receiving and storing or safely discharging the return medium. It is understood that the connection of the return port 130 can be flexibly adjusted according to actual operating conditions and is suitable for various application scenarios; this embodiment does not specifically limit its application.

[0027] In addition, interface 120 is used to connect with the device 50 to supply the medium passing through the conveying pipe 300 to the corresponding device 50 to meet the needs of different processes.

[0028] Furthermore, to improve the maintainability and operational continuity of the pipeline return box 10, the pipeline return box 10 also includes a first regulating valve 310 and a second regulating valve 330 located on the delivery pipeline 300, with the connection point between the return pipeline 500 and the delivery pipeline 300 located between the first regulating valve 310 and the second regulating valve 330.

[0029] It should be noted that under normal operating conditions, the first regulating valve 310 and the second regulating valve 330 are usually kept open to ensure that the medium in the delivery pipeline 300 can flow normally and not affect the continuous operation of the system. That is, the first regulating valve 310 and the second regulating valve 330 will not interfere with the automatic reflux function, and the system can realize real-time monitoring and automatic adjustment of the pressure of the delivery pipeline 300 through the pressure sensor 710 and the reflux valve 510.

[0030] When the return valve 510 or the return pipeline 500 malfunctions and requires inspection, replacement, or maintenance, the return pipeline 500 can be completely isolated by closing the first regulating valve 310 and the second regulating valve 330. This effectively cuts off the flow of fluid in the delivery pipeline 300, providing maintenance personnel with a safe and controllable operating environment. Optionally, both the first regulating valve 310 and the second regulating valve 330 can be manual valves or electric valves. For example, both the first regulating valve 310 and the second regulating valve 330 can be manual diaphragm valves, possessing good sealing and corrosion resistance.

[0031] Furthermore, the pipeline return box 10 also includes a detection pipeline 700, which is connected to the delivery pipeline 300, and a pressure sensor 710 is disposed on the detection pipeline 700. Based on this, the pressure sensor 710 indirectly but accurately monitors the pressure within the delivery pipeline 300 by sensing the pressure of the fluid in the detection pipeline 700. Even further, the pipeline return box 10 also includes a third regulating valve 730 disposed on the detection pipeline 700. The third regulating valve 730 is located between the delivery pipeline 300 and the pressure sensor 710, and can control the flow of fluid in the detection pipeline 700, thereby controlling the operating state of the pressure sensor 710.

[0032] Understandably, the third regulating valve 730 is open during normal operation, allowing the pressure sensor 710 to monitor the pipeline pressure in real time. When the pressure sensor 710 requires maintenance, replacement, or calibration, the pressure sensor 710 can be isolated from the delivery pipeline 300 by closing the third regulating valve 730, thus completing the relevant operations without interrupting the operation of the entire delivery system. Similar to the first regulating valve 310 and the second regulating valve 330 mentioned above, the third regulating valve 730 is a manual valve.

[0033] Optionally, the inner diameters of the detection pipe 700 and the delivery pipe 300 are the same. It is easy to understand that, under fluid connectivity conditions, when the detection pipe 700 and the delivery pipe 300 have the same diameter, there is no significant abrupt change in cross-section at their connection point. This avoids additional pressure drops caused by throttling effects or local resistance, thereby ensuring that the pressure within the detection pipe 700 can more accurately and quickly reflect the actual pressure state in the main pipeline of the delivery pipe 300, improving the accuracy of pressure measurement and dynamic response speed.

[0034] Furthermore, the reflux valve 510 is a pneumatic diaphragm valve. It should be noted that the pneumatic diaphragm valve has excellent sealing performance, effectively preventing liquid leakage when closed; and when open, it provides a large flow cross-sectional area to ensure a rapid and effective reflux process, thereby promptly alleviating overpressure in the pipeline.

[0035] In addition, the pneumatic diaphragm valve, as the core actuator of the reflux control, is installed on the reflux pipeline 500 and is used to automatically open or close under the command of the control system, thereby realizing the dynamic adjustment of the liquid pressure in the delivery pipeline 300.

[0036] Under normal operating conditions, when the pressure sensor 710 detects that the pressure in the delivery pipeline 300 does not exceed the set threshold, the pneumatic diaphragm valve is closed, and the return pipeline 500 is blocked. However, when the pressure sensor 710 detects that the pressure in the delivery pipeline 300 exceeds the set threshold, the control system sends a control signal to supply air to the actuator of the pneumatic diaphragm valve, causing it to drive the diaphragm and open the valve, thus enabling liquid to return to the supply point. Afterward, as the pipeline pressure gradually decreases and returns to the set range, the control system issues another command to cut off the air supply, closing the valve and ending the return process.

[0037] In other words, by using a pneumatic diaphragm valve as a backflow control device, this invention achieves automated and rapid response control of pipeline pressure, thereby improving the safety and operational efficiency of the system.

[0038] In other embodiments, the reflux valve 510 can also be a manual diaphragm valve. In this embodiment, the pressure sensor 710 can also be used only to detect the pressure in the pipeline 700 and send an alarm message to the control system, without directly controlling the reflux valve 510. In this case, the operator can determine whether a reflux operation is needed based on the alarm message and manually open or close the reflux valve 510.

[0039] Please see Figure 2 In a further embodiment of this utility model, the number of conveying pipes 300 is at least two, suitable for multi-channel chemical conveying systems. Furthermore, each conveying pipe 300 is equipped with a corresponding return pipe 500, a pressure sensor 710, and a return valve 510 to achieve independent monitoring and control of the pressure status of each conveying pipe 300.

[0040] Specifically, each delivery pipeline 300 is equipped with an independent pressure sensor 710 for real-time monitoring of the liquid pressure in its respective pipeline. When the pressure in a delivery pipeline 300 exceeds a preset safety threshold, the corresponding pressure sensor 710 will send a trigger signal to activate the backflow control mechanism of that pipeline, driving the corresponding backflow valve 510 to open. At this time, the liquid returns to the supply port 110 through the backflow pipeline 500 connected to the delivery pipeline 300, thereby achieving rapid pressure release and regulation. As the liquid flows back, the pressure in the pipeline gradually decreases. When the pressure returns to the set safety range, the pressure sensor 710 sends a signal again, causing the backflow valve 510 to close, and the backflow process ends.

[0041] Based on the above settings, the pressure status of each 300-meter conveying pipeline can be independently monitored and dynamically adjusted, avoiding the impact of abnormal pressure in a single pipeline on the overall system's operational stability and safety.

[0042] Optionally, the liquid supply interface 110, the usage interface 120, and the return interface 130 are also designed in a one-to-one correspondence manner. That is, the liquid supply path, the usage device 50 connection path, and the return path of each delivery pipeline 300 are connected through independent interfaces, thereby forming independent fluid passages and preventing mutual interference between different pipelines during delivery, usage, or return.

[0043] To improve the integration performance of the pipeline return box 10 when it has multiple channels, in situations such as Figure 3 In the embodiment shown, where there are at least two conveying pipes 300, each conveying pipe 300 may be equipped with a corresponding pressure sensor 710, a return branch 530, and a return valve 510 provided on the return branch 530, and at least two return branches 530 are connected to the same return interface 130 through the same return pipe 500.

[0044] That is, unlike the aforementioned scheme where each conveying pipe 300 is equipped with an independent return branch 530, this embodiment adopts a shared return pipe 500. All conveying pipes 300 converge into the same return pipe 500 through their respective return branches 530, and are ultimately connected to the same return interface 130.

[0045] Specifically, each delivery pipeline 300 is provided with a return branch 530 near the liquid supply end. The return branch 530 is equipped with a return valve 510 and is connected to a common return pipeline 500. When the pressure in any delivery pipeline 300 exceeds a preset threshold, its corresponding return valve 510 automatically opens, allowing part of the medium in the pipeline to return to the device connected to the return interface 130 via the common return pipeline 500.

[0046] In some other embodiments of this utility model, when there are multiple conveying pipes 300 and multiple return branches 530, multiple shared return pipes 500 can also be set up, wherein the number of return pipes 500 is less than the number of return branches 530. For example, any two or three return branches 530 can be connected to the same return pipe 500 and the same return interface 130, so that the multiple return branches 530 can be divided into multiple groups. The liquid of each group of return branches 530 converges to the same return pipe 500 and flows out, which is beneficial to the arrangement and connection of pipes and the return of liquid.

[0047] It should also be noted that the specific number of transport pipelines 300 in this application is not limited and can be flexibly configured according to actual application needs. In different embodiments, the system can be applied to the operating environment of one or more chemical transport pipelines 300.

[0048] Furthermore, since the reflux process is typically a short-term, localized pressure regulation process, requiring only a small amount of medium to be discharged to restore system balance, the inner diameter of the reflux pipe 500 is smaller than that of the delivery pipe 300. Based on this configuration, on the one hand, the smaller flow cross-sectional area limits the reflux flow rate per unit time, preventing excessive reflux from causing insufficient liquid supply or process interruption; on the other hand, under the same flow rate conditions, the smaller diameter pipe has a higher flow velocity, meeting the functional requirement of rapid pressure relief.

[0049] Furthermore, depending on the type of chemicals being transported and their chemical corrosive properties, the reflux box 100 is made of PVC (polyvinyl chloride) or SUS (stainless steel) material to ensure its corrosion resistance and structural stability in different chemical environments.

[0050] Specifically, in scenarios involving the transport of acidic and alkaline chemicals, the housing 100 is preferably made of PVC. PVC has excellent acid and alkali resistance, maintains structural stability in highly corrosive environments, and also possesses advantages such as good processing performance, low manufacturing cost, and ease of installation and maintenance, making it suitable for the transport of most conventional chemicals.

[0051] For conveying organic solvents or other media that are soluble or corrosive to plastic materials, the housing 100 is preferably made of SUS material, such as SUS304 or SUS316 stainless steel. SUS material has excellent corrosion resistance, high mechanical strength, good high temperature resistance and aging resistance, and is suitable for complex chemical environments and industrial applications that require long-term continuous operation.

[0052] Accordingly, the reflux valve 510 is selected based on the chemical properties of the conveyed medium, and can be made of PFA (soluble polytetrafluoroethylene) or SUS material. Among them, PFA material has excellent corrosion resistance and good sealing performance, and is suitable for conveying acid and alkali media; while SUS material is suitable for conveying organic solvents or other conveying scenarios that are sensitive to plastic materials, which can effectively prevent the valve body from being corroded or damaged, and ensure the long-term stable operation of the reflux control system.

[0053] Furthermore, the aforementioned first regulating valve 310, second regulating valve 330, and third regulating valve 730 can also be manufactured using materials compatible with the reflux valve 510, depending on the properties of the conveyed medium; that is, PFA or SUS materials are also preferred. By unifying and adapting the materials of multiple key valves, on the one hand, the corrosion resistance and structural reliability of the entire reflux box under different chemical environments are improved; on the other hand, it is beneficial to achieve compatibility and consistency of the system under different conveying conditions.

[0054] Please refer to it again. Figure 1 and Figure 2 A leak sensor 910 is also installed on the housing 100. The leak sensor 910 is used to detect whether there is a liquid leak inside the housing 100. Generally, the leak sensor 910 is placed near the bottom or in an area where liquid may accumulate to improve detection sensitivity and accuracy.

[0055] Under normal system operation, the leakage sensor 910 is in real-time monitoring mode. When liquid leaks into the housing 100 due to untimely backflow response or abnormal pressure, the leakage sensor 910 can respond quickly and issue an alarm signal, prompting operators to check and handle the situation in a timely manner, preventing the leakage accident from escalating further and ensuring the safety of on-site operations.

[0056] Optionally, the leakage sensor 910 can be linked with an external alarm device or control system to achieve audible and visual alarms or remote notification functions.

[0057] Furthermore, the housing 100 is also equipped with a waste discharge pipe 920, and a waste discharge valve 930 is installed on the waste discharge pipe 920. The waste discharge valve 930 is used to discharge leaked liquid. It can be understood that by setting up the waste discharge pipe 920 and the waste discharge valve 930, this utility model can effectively achieve rapid discharge of liquid in the event of a leak, which facilitates subsequent troubleshooting and equipment maintenance, thereby improving the maintainability and operational safety of the system.

[0058] Based on the above, when a liquid leak occurs inside the housing 100, the leak sensor 910 first detects the abnormality and issues an alarm signal, prompting the operator to respond promptly. After confirming the leak, the operator can drain the leaked liquid accumulated inside the housing 100 through the drain valve 930 to reduce on-site handling risks, improve operational safety, and provide a safe and clean operating environment for subsequent troubleshooting and maintenance.

[0059] In summary, this utility model provides a pipeline return box 10, including a box body 100 and a delivery pipe 300, a return pipe 500, a pressure sensor 710, and a return valve 510 disposed within the box body 100. The box body 100 is provided with a liquid supply interface 110, a usage interface 120, and a return interface 130. Accordingly, one end of the delivery pipe 300 is connected to the liquid supply interface 110, and the other end is connected to the usage interface 120, for transporting liquid or fluid media from the liquid supply device 30 to the usage device 50. One end of the return pipe 500 is connected to the delivery pipe 300, and the other end is connected to the return port 130, forming a return channel for returning part of the medium. The pressure sensor 710 detects the pressure in the delivery pipe 300. When the pressure exceeds a set value, the return valve 510 automatically opens, allowing part of the medium to flow back to the supply end, thereby reducing the pipe pressure. When the pressure returns to normal, the return valve 510 automatically closes, ensuring the medium continues to flow to the user equipment 50. Understandably, this setup achieves automatic regulation of the pipe pressure, effectively reducing the risk of medium leakage due to overpressure, reducing downtime and manual intervention, and improving the continuity, stability, and production efficiency of the system.

[0060] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A pipe return box, characterized in that, include: The housing (100) is provided with a liquid supply port (110), a use port (120) and a return port (130). A delivery pipe (300) is provided inside the housing (100), and one end of the delivery pipe (300) is connected to the liquid supply port (110), and the other end is connected to the use port (120); A return pipe (500) is provided inside the housing (100), and one end of the return pipe (500) is connected to the conveying pipe (300), and the other end is connected to the return interface (130); A pressure sensor (710) is connected to the delivery pipe (300) and is used to detect the pressure in the delivery pipe (300); A reflux valve (510) is provided on the reflux pipe (500) and is used to open when the pressure of the delivery pipe (300) exceeds a set value, so as to connect the delivery pipe (300) with the reflux interface (130).

2. The pipe return box according to claim 1, characterized in that, The pipeline return box (10) also includes a first regulating valve (310) and a second regulating valve (330) disposed on the delivery pipeline (300), and the connection point between the return pipeline (500) and the delivery pipeline (300) is located between the first regulating valve (310) and the second regulating valve (330).

3. The pipe return box according to claim 1, characterized in that, The pipeline return box (10) further includes a detection pipeline (700) and a third regulating valve (730) disposed on the detection pipeline (700); the detection pipeline (700) is connected to the conveying pipeline (300), and the pressure sensor (710) is disposed on the detection pipeline (700); the third regulating valve (730) is located between the conveying pipeline (300) and the pressure sensor (710).

4. The pipe return box according to claim 3, characterized in that, The detection pipe (700) and the conveying pipe (300) have the same inner diameter.

5. The pipe return box according to claim 1, characterized in that, The reflux valve (510) is a pneumatic diaphragm valve.

6. The pipe return box according to claim 1, characterized in that, The number of the conveying pipes (300) is at least two, and each of the conveying pipes (300) is equipped with a corresponding return pipe (500), a pressure sensor (710) and a return valve (510). Alternatively, each of the conveying pipes (300) is equipped with a corresponding pressure sensor (710), a return branch (530), and a return valve (510) provided on the return branch (530), and at least two of the return branches (530) are connected to the same return interface (130) through the same return pipe (500).

7. The pipe return box according to claim 1, characterized in that, The inner diameter of the return pipe (500) is smaller than the inner diameter of the delivery pipe (300).

8. The pipe return box according to any one of claims 1 to 7, characterized in that, A leak sensor (910) is also provided on the housing (100), and the leak sensor (910) is used to detect whether there is a liquid leak inside the housing (100).

9. The pipe return box according to claim 8, characterized in that, The housing (100) is also provided with a waste discharge pipe (920), and the waste discharge pipe (920) is provided with a waste discharge valve (930), which is used to discharge the leaked liquid.

10. The pipe return box according to any one of claims 1 to 7, characterized in that, The enclosure (100) is made of PVC or SUS material.

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