Liquid supply system

Abstract

The utility model discloses a liquid supply system. According to the embodiment of the utility model, the liquid supply system comprises a liquid inlet pipeline, a liquid inlet device and a first liquid preparation device group, the liquid inlet pipeline is used for introducing external reverse osmosis water into the liquid supply system; the liquid inlet device is selectively communicated with the liquid inlet pipeline; the liquid inlet device comprises a liquid inlet container and a heating assembly, and the heating assembly is used for heating liquid in the liquid inlet container to a preset temperature; the first liquid preparation device group comprises a first liquid preparation device and a second liquid preparation device; a liquid inlet of the first liquid preparation device is selectively communicated with a liquid outlet of the liquid inlet container, and a liquid outlet of the first liquid preparation device is communicated with the hemodialysis chamber; the liquid inlet of the second liquid preparation device is selectively communicated with the liquid outlet end of the liquid inlet pipeline, and the liquid outlet of the second liquid preparation device is communicated with the hemodialysis chamber. According to the invention, the liquid supply reliability and the temperature controllability in the dialysate preparation process can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical equipment technical field especially for liquid supply system. BACKGROUND

[0002] Hemodialysis is a way of treating patients with acute and chronic renal failure, and is an effective treatment for uremia patients to maintain life. Hemodialysis room is equipped with multiple hemodialysis machines, which requires a large amount of and safe dialysate to be supplied stably. The hemodialysis room usually uses a centralized liquid supply system to realize centralized preparation and delivery of dialysate. HCO3 - and Ca 2 + and Mg 2+ are easy to form precipitates, which are generally divided into dialysis A liquid and dialysis B liquid, and are mixed uniformly before dialysis to prepare dialysate. Hemodialysis B powder is mainly NaHCO3, which is difficult to dissolve, and heating can be used to promote the dissolution of dialysis B powder during the preparation of dialysis B liquid. The components of dialysis A powder, such as sodium chloride, potassium chloride, magnesium chloride, calcium chloride, glacial acetic acid and sodium acetate, are easy to dissolve, and heating is not required during the preparation process.

[0003] In related technologies, the centralized liquid supply system directly heats the dialysis B liquid, the temperature control is poor, and NaHCO3 is easy to decompose and deteriorate. UTILITY MODEL CONTENT

[0004] The utility model aims to solve one of the technical problems in the prior art. Therefore, one purpose of the utility model is to provide a liquid supply system, which can improve the controllability of temperature and the reliability of liquid supply during the preparation of dialysate.

[0005] The liquid supply system according to the utility model embodiment comprises a liquid inlet pipeline, a liquid inlet device and a first liquid preparation device group. The liquid inlet pipeline is used to pass external reverse osmosis water into the liquid supply system. The liquid inlet device is in selective communication with the liquid inlet pipeline. The liquid inlet device comprises a liquid inlet container and a heating assembly, and the heating assembly is used to heat the liquid in the liquid inlet container to a preset temperature. The first liquid preparation device group comprises a first liquid preparation device and a second liquid preparation device. The liquid inlet of the first liquid preparation device is in selective communication with the liquid outlet of the liquid inlet container, and the liquid outlet of the first liquid preparation device is in communication with a hemodialysis room. The liquid inlet of the second liquid preparation device is in selective communication with the liquid outlet end of the liquid inlet pipeline, and the liquid outlet of the second liquid preparation device is in communication with the hemodialysis room.

[0006] Preferably, the liquid inlet of the first liquid preparation device is in selective communication with the liquid inlet pipeline. The liquid inlet of the first liquid preparation device is in selective communication with the liquid inlet pipeline or the liquid inlet container.

[0007] Preferably, the outlet of the liquid inlet container is arranged at the bottom of the liquid inlet container; and at least two liquid level sensors are arranged at different heights on the liquid inlet container, at least one of the liquid level sensors is a low liquid level sensor and is arranged within the interval of one fifth to one third of the height of the liquid inlet container, and at least one of the liquid level sensors is a high liquid level sensor and is arranged within the interval of one fifth to one third of the height of the liquid inlet container.

[0008] Preferably, the liquid inlet device further comprises a liquid inlet pump, an inlet of the liquid inlet pump is selectively connected to the liquid inlet pipe or the outlet of the liquid inlet container, and an outlet of the liquid inlet pump is selectively connected to the inlet of the liquid inlet container or the first liquid preparation device.

[0009] Preferably, the liquid inlet device comprises a stirring device arranged in the liquid inlet container, and the stirring device is used to stir the liquid in the liquid inlet container.

[0010] Preferably, the liquid inlet device further comprises a disinfection branch, an outlet of the liquid inlet pipe is selectively connected to an inlet of the disinfection branch or the inlet of the liquid inlet container, an outlet of the disinfection branch is selectively connected to the disinfection inlet of the liquid inlet container, the disinfection inlet of the first liquid preparation device and the disinfection inlet of the second liquid preparation device, and a disinfectant preparation device is arranged between the inlet of the disinfection branch and the outlet of the disinfection branch.

[0011] Preferably, the first liquid preparation device group further comprises a first liquid return pipe, and the first liquid return pipe comprises two first liquid return branches, wherein an inlet of one of the first liquid return branches is connected to the outlet of the first liquid preparation device, and an outlet of the first liquid return branch is connected to the liquid return port of the first liquid preparation device; and an inlet of the other of the first liquid return branches is connected to the outlet of the second liquid preparation device, and an outlet of the first liquid return branch is connected to the liquid return port of the second liquid preparation device.

[0012] Preferably, the liquid inlet device further comprises a second liquid preparation device group, and the second liquid preparation device group comprises a third liquid preparation device, a fourth liquid preparation device and a second liquid return pipe, wherein the third liquid preparation device is selectively connected to the outlet of the first liquid preparation device or the liquid inlet container, the fourth liquid preparation device is selectively connected to the outlet of the second liquid preparation device or the outlet of the liquid inlet pipe, and the second liquid return pipe comprises two second liquid return branches, wherein an inlet of one of the second liquid return branches is connected to the outlet of the third liquid preparation device, and an outlet of the second liquid return branch is connected to the liquid return port of the third liquid preparation device; and an inlet of the other of the second liquid return branches is connected to the outlet of the fourth liquid preparation device, and an outlet of the second liquid return branch is connected to the liquid return port of the fourth liquid preparation device.

[0013] Preferably, at least one filter and a pressure detector are arranged between the third liquid preparation device and the hemodialysis chamber; at least one filter and a pressure detector are arranged between the fourth liquid preparation device and the hemodialysis chamber.

[0014] Preferably, a second three-way valve is arranged between the third liquid preparation device and the first liquid preparation device, the second three-way valve has three ports, and the three ports are respectively connected to the first liquid preparation device, the third liquid preparation device and the hemodialysis chamber, the second three-way valve is used to control the first liquid preparation device to be connected to the third liquid preparation device or the hemodialysis chamber; a third three-way valve is arranged between the fourth liquid preparation device and the second liquid preparation device, the third three-way valve has three ports, and the three ports are respectively connected to the second liquid preparation device, the fourth liquid preparation device and the hemodialysis chamber, the third three-way valve is used to control the second liquid preparation device to be connected to the fourth liquid preparation device or the hemodialysis chamber.

[0015] Preferably, a fourth three-way valve is arranged on the first liquid return branch, one liquid outlet of the fourth three-way valve is used to discharge liquid; and / or, a fourth three-way valve is arranged on the second liquid return branch, one liquid outlet of the fourth three-way valve is used to discharge liquid.

[0016] Preferably, the first liquid preparation device, the second liquid preparation device, the third liquid preparation device and the fourth liquid preparation device each include a liquid preparation barrel and a liquid preparation pump, the liquid preparation pump is used to pump the liquid in the liquid preparation barrel to the hemodialysis chamber.

[0017] Preferably, each liquid preparation device includes at least two liquid preparation pumps connected in series, the liquid outlet of one of the liquid preparation pumps is connected to the liquid inlet of another liquid preparation pump adjacent to it; at least one of the liquid preparation pumps is an emptying pump, and at least one of the liquid preparation pumps is a liquid sending pump.

[0018] Preferably, the liquid return pipeline further includes two common liquid return pipelines and two fifth three-way valves, one of the fifth three-way valves has three ports, and the three ports are respectively connected to one of the common liquid return pipelines, one of the first liquid return branches and one of the second liquid return branches; the other fifth three-way valve has three ports, and the three ports are respectively connected to the other common liquid return pipeline, the other first liquid return branch and the other second liquid return branch; one of the fifth three-way valves controls one of the common liquid return pipelines to be connected to one of the first liquid return branches or one of the second liquid return branches; the other fifth three-way valve controls the other common liquid return pipeline to be connected to the other first liquid return branch or the other second liquid return branch.

[0019] Preferably, the liquid inlet device includes a conductivity sensor and a temperature sensor arranged in the liquid inlet container, which are used to detect the reverse osmosis water.

[0020] In the application, the liquid inlet device can heat the reverse osmosis water in the liquid inlet container and save it in the liquid inlet container, and the heating time is saved when warm water is needed for dialysis liquid. The dialysis powder is added to the first liquid preparation device, and the liquid inlet device provides warm water to the first liquid preparation device, so that the temperature of the dialysis liquid is more uniform, and decomposition and deterioration of the dialysis liquid can be effectively avoided, and the controllability of the temperature of the dialysis liquid in the preparation process is improved. At the same time, the liquid inlet device is arranged in front, different types of dialysis powder can use the same specification of hardware configuration, modular production is realized, resources are shared, and cost is saved. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 is a structural schematic view of the liquid supply system according to the embodiment of the present application;

[0023] Figure 2 is a structural schematic view of the liquid inlet device according to the embodiment of the present application;

[0024] Figure 3 is a structural schematic view of the liquid inlet device when reverse osmosis water flows in according to the embodiment of the present application;

[0025] Figure 4 is a structural schematic view of the liquid inlet device when reverse osmosis water flows out according to the embodiment of the present application;

[0026] Figure 5 is a structural schematic view of the liquid inlet device when disinfectant water flows out according to the embodiment of the present application;

[0027] Figure 6 is a structural schematic view of the liquid inlet device when the liquid outlet valve is opened according to the embodiment of the present application;

[0028] Figure 7 is a structural schematic view of the first liquid preparation device supplying liquid to the hemodialysis chamber according to the embodiment of the present application, and is also a structural schematic view of the second liquid preparation device supplying liquid to the hemodialysis chamber according to the embodiment of the present application;

[0029] Figure 8 is a structural schematic view of the connection between the first liquid preparation device and the third liquid preparation device according to the embodiment of the present application, and is also a structural schematic view of the connection between the second liquid preparation device and the fourth liquid preparation device according to the embodiment of the present application, which is a dialysis liquid connection process;

[0030] Figure 9 is a structural schematic view of the first liquid preparation device and the third liquid preparation device, the third liquid preparation device prepares liquid and supplies the liquid to the hemodialysis chamber, and is also a structural schematic view of the second liquid preparation device and the fourth liquid preparation device, the fourth liquid preparation device prepares liquid and supplies the liquid to the hemodialysis chamber.

[0031] Figure 10 is a structural schematic view of the circulation of the disinfectant between the liquid preparation device and the hemodialysis chamber according to an embodiment of the present application.

[0032] Reference signs:

[0033] Liquid supply system 100;

[0034] Liquid inlet pipeline 1, liquid inlet end J1 of the liquid inlet pipe, liquid outlet end C1 of the liquid inlet pipe, liquid inlet valve 11;

[0035] Liquid inlet device 2, liquid inlet container 21, liquid inlet port J21 of the liquid inlet container, liquid outlet port C21 of the liquid inlet container, liquid inlet pump 22, liquid outlet port C22 of the liquid inlet pump, liquid inlet pipeline 23, first liquid inlet branch pipe 231, second liquid inlet branch pipe 232, reverse osmosis water detection sensor 25, liquid level sensor 26, low liquid level sensor 261, high liquid level sensor 262, top liquid level sensor 263, liquid outlet valve 281;

[0036] First liquid preparation group 3, first liquid preparation device 31, second liquid preparation device 32;

[0037] Second liquid preparation group 4, third liquid preparation device 41, fourth liquid preparation device 42;

[0038] Disinfection branch 5, liquid inlet end J5 of the disinfection branch, liquid outlet end C5 of the disinfection branch, disinfectant preparation device 51;

[0039] Filter 61, pressure detector 62;

[0040] Second three-way valve 72, third three-way valve 73, fourth three-way valve 74, fifth three-way valve 75;

[0041] Hemodialysis chamber 8;

[0042] Liquid return pipeline 9, common liquid return pipeline 90, first liquid return pipeline 91, second liquid return pipeline 92. DETAILED DESCRIPTION

[0043] Embodiments of the present application will be described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are for the purpose of explanation of the present application, and are not to be understood as a limitation of the present application.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0045] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] Reference will now be made to Figures 1-9 The liquid supply system 100 according to the embodiments of the present application is described, Figures 3-9 In the description of the present application, the thick solid line portion represents the liquid flow direction.

[0047] As Figures 1-2 The liquid supply system 100 according to the embodiments of the present application includes a liquid inlet pipeline 1, a liquid inlet device 2 and a first liquid preparation device group 3.

[0048] The liquid inlet pipeline 1 can pass the external reverse osmosis water into the liquid supply system 100;

[0049] The liquid inlet device 2 is selectively communicated with the liquid inlet pipeline 1. When the liquid inlet device 2 is communicated with the liquid inlet pipeline 1, the reverse osmosis water is communicated into the liquid inlet device 2; when the liquid inlet device 2 is not communicated with the liquid inlet pipeline 1, the reverse osmosis water cannot enter the liquid inlet device 2 and enters other passages. For example, the liquid inlet pipeline 1 can be further provided with various valves, and the liquid inlet pipeline 1 is controlled to be communicated or not communicated by opening or closing the valves, so that the liquid inlet pipeline 1 is selectively communicated with the components that need to be communicated.

[0050] The liquid inlet device 2 comprises a liquid inlet container 21 and a heating assembly, and the heating assembly can heat the liquid in the liquid inlet container 21 to a preset temperature.

[0051] The first liquid preparation device group 3 comprises a first liquid preparation device 31 and a second liquid preparation device 32. The liquid inlet of the first liquid preparation device 31 is selectively communicated with the liquid outlet C21 of the liquid inlet container, and the liquid outlet of the first liquid preparation device 31 is communicated with the hemodialysis chamber. The liquid inlet of the second liquid preparation device 32 is selectively communicated with the liquid outlet end C1 of the liquid inlet pipeline, and the liquid outlet of the second liquid preparation device 32 is communicated with the hemodialysis chamber. The first liquid preparation device 31 is used for preparing dialysis B liquid, and the second liquid preparation device 32 is used for preparing dialysis A liquid.

[0052] It needs to be further explained that the dialysis B powder is mainly NaHCO3 and is difficult to dissolve. The preparation of the dialysis B liquid is performed in the first liquid preparation device 31. The first liquid preparation device 31 is communicated with the liquid inlet device 2, and the reverse osmosis water is communicated into the first liquid preparation device 31 after being heated. The temperature of the heated reverse osmosis water is higher and can promote the dissolution of the B powder. The sodium chloride, potassium chloride, magnesium chloride, calcium chloride, glacial acetic acid and sodium acetate of the dialysis A powder are all easy to dissolve. The preparation of the dialysis A liquid is performed in the second liquid preparation device 32, and the preparation process does not need to be heated.

[0053] In the embodiments of the present application, the selective communication means that the communication of each communication passage (pipeline) is controlled by a valve or a switch on the pipeline to realize the communication or non-communication of the communication passage. For example, the liquid inlet valve 11 is arranged on the liquid inlet pipeline 1 to control the communication or non-communication of the liquid inlet pipeline 1 with the reverse osmosis water. The liquid inlet valve 11 is arranged between the liquid inlet end J1 of the liquid inlet pipeline and the liquid outlet end C1 of the liquid inlet pipeline, and is the total liquid valve of the liquid supply system 100. For example, the first electromagnetic valve SV1 is arranged at the liquid inlet of the first liquid preparation device 31 to control whether the reverse osmosis water is communicated into the first liquid preparation device 31. For example, the second electromagnetic valve SV2 is arranged at the liquid inlet of the second liquid preparation device 32 to control whether the reverse osmosis water is communicated into the second liquid preparation device 32.

[0054] In the present application, the liquid inlet device 2 can preheat the reverse osmosis water in the liquid inlet container 21 and store it in the liquid inlet container 21, and use it when warm water is needed for dialysis solution preparation, saving heating time and further improving temperature control. Add dialysis powder in the first liquid preparation device 31, and the liquid inlet device 2 provides warm water to the first liquid preparation device 31, so that the temperature of the dialysis solution is more uniform, which can effectively avoid the decomposition and deterioration of the dialysis solution due to excessive temperature in some positions. At the same time, by placing the liquid inlet device 2 in front, dialysis A and dialysis B can use the same specification hardware configuration, realize modular production, share resources, and save costs.

[0055] As shown in Figure 2 In some embodiments, the liquid inlet of the first liquid preparation device 31 is selectively connected to the outlet end C1 of the liquid inlet pipeline; wherein the liquid inlet of the first liquid preparation device 31 is selectively connected to the outlet end C1 of the liquid inlet pipeline or the outlet C21 of the liquid inlet container. The first liquid preparation device 31 can be connected to the reverse osmosis water through the outlet end C1 of the liquid inlet pipeline. When the liquid inlet container 21 fails, the liquid inlet of the first liquid preparation device 31 can be directly connected to the outlet end C1 of the liquid inlet pipeline, thereby improving the reliability of the liquid supply system 100. Alternatively, the outlet C21 of the liquid inlet container and the liquid inlet of the first liquid preparation device 31 are connected, and a third solenoid valve SV3 is provided between the outlet C21 of the liquid inlet container and the liquid inlet of the first liquid preparation device 31, which can control the connection or disconnection between the outlet C21 of the liquid inlet container and the liquid inlet of the first liquid preparation device 31; at the same time, a fourth solenoid valve SV4 is provided between the outlet end C1 of the liquid inlet pipeline and the liquid inlet of the first liquid preparation device 31, which can control the connection or disconnection between the outlet end C1 of the liquid inlet pipeline and the liquid inlet of the first liquid preparation device 31. When the third solenoid valve SV3 connects the outlet C21 of the liquid inlet container and the liquid inlet of the first liquid preparation device 31, the fourth solenoid valve SV4 disconnects the connection between the outlet end C1 of the liquid inlet pipeline and the liquid inlet of the first liquid preparation device 31; or when the third solenoid valve SV3 disconnects the connection between the outlet C21 of the liquid inlet container and the liquid inlet of the first liquid preparation device 31, the fourth solenoid valve SV4 connects the connection between the outlet end C1 of the liquid inlet pipeline and the liquid inlet of the first liquid preparation device 31.

[0056] Alternatively, the outlet end C1 of the liquid inlet pipeline, the liquid inlet of the first liquid preparation device 31 and the outlet C21 of the liquid inlet container can be controlled by setting an electromagnetic three-way valve. After the electromagnetic three-way valve is powered on, two paths in it can be connected, for example, the electromagnetic three-way valve connects the liquid inlet of the first liquid preparation device 31 and the outlet C21 of the liquid inlet container, but does not connect the liquid inlet of the first liquid preparation device 31 and the outlet end C1 of the liquid inlet pipeline; or the electromagnetic three-way valve connects the liquid inlet of the first liquid preparation device 31 and the outlet end C1 of the liquid inlet pipeline, but does not connect the liquid inlet of the first liquid preparation device 31 and the outlet C21 of the liquid inlet container.

[0057] like Figure 2 As shown, in some embodiments, the liquid inlet device 2 further includes a reverse osmosis water detection sensor 25; the liquid inlet container 21 is equipped with a drain valve 281. When the reverse osmosis water index detected by the reverse osmosis water detection sensor 25 does not match the preset reverse osmosis water index, the drain valve 281 can discharge the reverse osmosis water in the liquid inlet container 21. The drain valve 281 is connected to the liquid inlet container 21 and can open and close the drain port of the liquid inlet container 21. When the liquid inlet container 21 is disinfected and cleaned, it is used to discharge the cleaning water. At the same time, when the reverse osmosis water does not meet the requirements for making dialysis fluid, it can be discharged from the drain valve 281 in a timely manner, which helps to prevent reverse osmosis water from entering the first liquid preparation device 31, causing pollution and waste of dialysis powder. At the same time, it makes the preparation of dialysis fluid more controllable.

[0058] like Figure 2 As shown, in some embodiments, the outlet of the inlet container 21 is located at the bottom of the inlet container 21; the inlet container 21 is equipped with at least two liquid level sensors 26 spaced apart in height, at least one liquid level sensor 26 is a low liquid level sensor 261 located in the range of one-fifth to one-third of the bottom of the inlet container 21, and at least one liquid level sensor 26 is a high liquid level sensor 262 located in the range of one-fifth to one-third of the top of the inlet container 21. Reverse osmosis water can be discharged from the bottom of the inlet container 21 by its own gravity. By setting a low liquid level sensor 261 on the inlet container 21, reverse osmosis water can be sensed and replenished in a timely manner; by setting a high liquid level sensor 262 on the inlet container 21, reverse osmosis water can be stopped in a timely manner when there is sufficient reverse osmosis water in the inlet container 21, reducing resource waste. In summary, by setting liquid level sensors 26, the controllability of the inlet container 21 can be improved, making the preparation of dialysate more controllable.

[0059] like Figures 2-6 As shown, in some embodiments, the liquid inlet device 2 further includes a liquid inlet pump 22. The inlet of the liquid inlet pump is selectively connected to the liquid inlet pipeline 1 and the liquid outlet C21 of the liquid inlet container. The liquid outlet C22 of the liquid inlet pump is selectively connected to the liquid inlet J21 of the liquid inlet container and the first liquid dispensing device 31. The liquid inlet pump 22 plays a role in both the liquid inlet and liquid outlet of the liquid inlet container 21, thereby improving the utilization rate of the liquid inlet pump 22 and reducing the layout cost.

[0060] In this embodiment, selective connection of the connecting port means that the connecting port can connect to multiple components. The connecting port is connected to one component to connect liquid to that connected component, while the connecting port is not connected to other components. For example, the inlet of the liquid inlet pump can be connected to the liquid inlet pipe 1, but the liquid inlet of the liquid inlet pump is not connected to the liquid outlet C21 of the liquid inlet container; or, the liquid inlet of the liquid inlet pump can be connected to the liquid outlet C21 of the liquid inlet container, but the liquid inlet of the liquid inlet pump is not connected to the liquid inlet pipe 1. For example, the liquid outlet C22 of the liquid inlet pump is connected to the liquid inlet J21 of the liquid inlet container, but the liquid outlet C22 of the liquid inlet pump is not connected to the first liquid dispensing device 31; or, the liquid outlet C22 of the liquid inlet pump is connected to the first liquid dispensing device 31, but the liquid outlet C22 of the liquid inlet pump is not connected to the liquid inlet J21 of the liquid inlet container.

[0061] like Figure 3 As shown in the attached figure, the thick solid line represents the reverse osmosis liquid feeding direction. When the feed pump 22 pumps the reverse osmosis liquid from the inlet pipe 1 to the inlet container 21, the inlet of the feed pump can be connected to the inlet pipe 1, but the inlet of the feed pump is not connected to the outlet C21 of the inlet container. Furthermore, the outlet C22 of the feed pump is connected to the inlet J21 of the inlet container, but the outlet C22 of the feed pump is not connected to the first liquid distribution device 31.

[0062] like Figure 4 As shown in the attached figure, the thick solid line represents the reverse osmosis liquid feeding direction. When the feed pump 22 pumps the reverse osmosis liquid from the feed container 21 to the first liquid distribution device 31, the inlet of the feed pump can be connected to the outlet C21 of the feed container, while the inlet of the feed pump is not connected to the inlet pipe 1. Furthermore, the outlet C22 of the feed pump is connected to the first liquid distribution device 31, while the outlet C22 of the feed pump is not connected to the inlet J21 of the feed container.

[0063] The inlet pump 22 can adjust the extraction speed and volume of reverse osmosis water. In conjunction with the above embodiment, the level sensor 26 can also be installed as a mid-level sensor in the middle of the inlet container 21, which can more accurately obtain the degree of liquid level change, thereby more accurately reflecting the usage speed of the reverse osmosis water. By setting the inlet pump 22, the extraction volume and speed of the reverse osmosis water can be adjusted. When the reverse osmosis water is used quickly, the power of the inlet pump 22 can be increased to improve the extraction speed and volume, reduce heating time, and improve configuration efficiency; when the reverse osmosis water is used slowly, the power of the inlet pump 22 can be reduced to decrease the extraction speed and volume, reducing waste of reverse osmosis water.

[0064] like Figure 2 As shown, for example, the liquid level sensor 26 may also include a top liquid level sensor 263 disposed on the top of the inlet container 21 to provide timely feedback on information that the reverse osmosis water has filled the inlet container 21.

[0065] like Figure 2 As shown, in some embodiments, the liquid inlet device 2 includes a stirring device disposed within the liquid inlet container 21, which can stir the liquid in the liquid inlet container 21. By stirring the liquid with the stirring device, the temperature of the liquid can be made more uniform.

[0066] like Figure 2 As shown, for example, the outlet C22 of the inlet pump is connected to the receiving cavity of the inlet container 21 via the inlet pipe 23. The inlet pipe 23 includes a first inlet branch pipe 231 and a second inlet branch pipe 232. The outlet end of the first inlet branch pipe 231 is equipped with a spray device, and the end of the second inlet branch pipe 232 is equipped with a stirring device. The stirring device includes a motor and two branch pipes, both of which are connected to the second inlet branch pipe 232. Under the action of the motor, the branch pipes can rotate to discharge water, forming a vortex for stirring, thereby achieving uniform water temperature in the constant temperature water tank.

[0067] like Figure 2 As shown, in some embodiments, the liquid supply system 100 further includes a disinfection branch. The outlet end C1 of the inlet pipe 1 is selectively connected to the inlet end J5 of the disinfection branch and the inlet container 21. The outlet end C5 of the disinfection branch is connected to the disinfection inlet of the inlet container 21. The outlet end C5 of the disinfection branch is connected to the disinfection inlet of the first liquid preparation device 31. The outlet end C5 of the disinfection branch is connected to the disinfection inlet of the second liquid preparation device 32. A disinfectant preparation device 51 is provided between the inlet end J5 and the outlet end C5 of the disinfection branch. Reverse osmosis water can be prepared into disinfectant solution through the disinfection preparation device. The disinfectant solution can enter the inlet container 21, the first liquid preparation device 31, and the second liquid preparation device 32, thereby disinfecting the liquid supply system 100.

[0068] In this embodiment, selective pipeline connection means that the pipeline has multiple outlets, and the pipeline is connected to one outlet to connect the liquid to a connected component, while the pipeline is not connected to other outlets. For example, the outlet C1 of the inlet pipeline 1 is connected to the inlet of the disinfection branch 5 through one passage, and the outlet C1 of the inlet pipeline 1 is connected to the inlet container 21 through another passage. When the outlet C1 of the inlet pipeline 1 is connected to the inlet of the disinfection branch 5, the outlet C1 of the inlet pipeline 1 is not connected to the inlet container 21; when the outlet C1 of the inlet pipeline 1 is connected to the inlet container 21, the outlet C1 of the inlet pipeline 1 is not connected to the inlet of the disinfection branch 5. As another example, the outlet C1 of the inlet pipeline 1, the inlet of the disinfection branch 5, and the inlet container 21 are connected by a solenoid three-way valve.

[0069] like Figure 5As shown in the attached diagram, the thick solid line indicates the liquid feeding direction. The outlet C1 of the inlet pipe 1, the inlet of the disinfection branch 5, and the inlet container 21 are connected by an electromagnetic three-way valve. During disinfection of the supply system 100, the outlet C1 of the inlet pipe 1 and the inlet of the disinfection branch 5 are connected, while the inlet pipe 1 and the inlet container 21 are not connected. Reverse osmosis water can be processed into disinfectant by the disinfection equipment. The disinfectant can then enter the inlet container 21, the first mixing device 31, and the second mixing device 32, thereby disinfecting the supply system 100. In conjunction with the above embodiment, the inlet of the inlet pump can be connected to the outlet C21 of the inlet container, while the inlet of the inlet pump is not connected to the inlet pipe 1. Furthermore, the outlet C22 of the inlet pump is connected to the inlet J21 of the inlet container, allowing the disinfectant to circulate and improve the disinfection effect. The first inlet branch pipe 231 is equipped with a spray device at its outlet end to increase the spray range and space of the disinfectant. The second inlet branch pipe 232 is equipped with a stirring device at its end. The stirring device includes a motor and two branch pipes, both of which are connected to the second inlet branch pipe 232. Under the action of the motor, the branch pipes can rotate to discharge the disinfectant, forming a vortex for stirring, ensuring thorough cleaning through circulation. The drain valve 281 can also completely drain the disinfectant, reducing residue.

[0070] like Figure 3 and Figure 4 As shown in the attached figure, the thick solid line indicates the direction of liquid feed. When not disinfected, the outlet C1 of the inlet pipe is connected to the inlet container 21, and the inlet ends of the inlet pipe 1 and the disinfection branch 5 are not connected, which can effectively prevent the disinfectant from contaminating the dialysate.

[0071] like Figure 7 As shown, in some embodiments, the first solution preparation device group 3 further includes a first return line 91, which includes two first return branches. The inlet end of one first return branch is connected to the outlet of the first solution preparation device 31, and the outlet end of the other first return branch is connected to the return port of the first solution preparation device 31. The inlet end of the other first return branch is connected to the outlet of the second solution preparation device 32, and the outlet end of the other first return branch is connected to the return port of the second solution preparation device 32. When the solution supply system 100 supplies solution to the hemodialysis room 8, the dialysate returns through the first return line 91. The dialysis volume is relatively small, but the solution continues to circulate.

[0072] Specifically, dialysis solution B is connected to the hemodialysis chamber 8 from the first solution preparation device 31 through a pipeline. Part of the dialysis solution is used for dialysis, and the other part of the dialysis solution is returned through a first return branch 91 to continue the circulation. Dialysis solution A is connected to the hemodialysis chamber 8 from the second solution preparation device 32 through a pipeline. Part of the dialysis solution is used for dialysis, and the other part of the dialysis solution is returned through another first return branch 91.

[0073] likeFigure 1 、 Figures 7-9 As shown in FIG. 1 and FIG. 2, in some embodiments, the liquid supply system 100 further comprises a second liquid preparation device group 4, which comprises a third liquid preparation device 41, a fourth liquid preparation device 42 and a second liquid return pipeline. The third liquid preparation device 41 is selectively connected to the liquid outlet C21 of the first liquid preparation device 31 or the liquid inlet container 21. The fourth liquid preparation device 42 is selectively connected to the second liquid preparation device 32 or the liquid outlet end C1 of the liquid inlet pipeline 1. The third liquid preparation device 41 can be used as a dialysate storage barrel of the first liquid preparation device 31 to store dialysate configured by the first liquid preparation device 31. The fourth liquid preparation device 42 can be used as a dialysate storage barrel of the second liquid preparation device 32 to store dialysate configured by the second liquid preparation device 32. In addition, the third liquid preparation device 41 can be configured with dialysate by itself, and the fourth liquid preparation device 42 can also be configured with dialysate by itself. Therefore, in the case of failure or malfunction of the first liquid preparation device 31 and the second liquid preparation device 32, the third liquid preparation device 41 and the fourth liquid preparation device 42 can be used in emergency, thereby improving the stability and reliability of the entire liquid supply system 100.

[0074] In the embodiments of the present application, the selective connection of the device refers to that the device is connected to one component to communicate liquid to one component connected thereto, and the device is not connected to other components. For example, the third liquid preparation device 41 is connected to the first liquid preparation device 31, and the first liquid preparation device 31 can communicate liquid to the third liquid preparation device 41, while the third liquid preparation device 41 is not connected to the liquid outlet of the liquid inlet container. Alternatively, the third liquid preparation device 41 is connected to the liquid outlet of the liquid inlet container 21, while the third liquid preparation device 41 is not connected to the first liquid preparation device 31. For another example, the fourth liquid preparation device 42 is connected to the second liquid preparation device 32, and the second liquid preparation device 32 can communicate liquid to the fourth liquid preparation device 42, while the fourth liquid preparation device 42 is not connected to the liquid outlet end C1 of the liquid inlet pipeline 1. Alternatively, the fourth liquid preparation device 42 is connected to the liquid outlet end C1 of the liquid inlet pipeline 1, while the fourth liquid preparation device 42 is not connected to the second liquid preparation device 32.

[0075] It should be further explained that the third liquid preparation device 41 has a liquid inlet and a sterilized liquid inlet, the sterilized liquid inlet of the third liquid preparation device is connected to the liquid outlet C21 of the liquid inlet container, and the liquid inlet of the third liquid preparation device is connected to the liquid outlet end C1 of the liquid inlet pipeline. Similarly, the fourth liquid preparation device 42 has a liquid inlet and a sterilized liquid inlet, the sterilized liquid inlet of the fourth liquid preparation device is connected to the liquid outlet C21 of the liquid inlet container, and the liquid inlet of the fourth liquid preparation device is connected to the liquid outlet end C1 of the liquid inlet pipeline.

[0076] As shown in FIG. 1 and FIG. 2, in some embodiments, the liquid supply system 100 further comprises a second liquid preparation device group 4, which comprises a third liquid preparation device 41, a fourth liquid preparation device 42 and a second liquid return pipeline. The third liquid preparation device 41 is selectively connected to the liquid outlet C21 of the first liquid preparation device 31 or the liquid inlet container 21. The fourth liquid preparation device 42 is selectively connected to the second liquid preparation device 32 or the liquid outlet end C1 of the liquid inlet pipeline 1. The third liquid preparation device 41 can be used as a dialysate storage barrel of the first liquid preparation device 31 to store dialysate configured by the first liquid preparation device 31. The fourth liquid preparation device 42 can be used as a dialysate storage barrel of the second liquid preparation device 32 to store dialysate configured by the second liquid preparation device 32. In addition, the third liquid preparation device 41 can be configured with dialysate by itself, and the fourth liquid preparation device 42 can also be configured with dialysate by itself. Therefore, in the case of failure or malfunction of the first liquid preparation device 31 and the second liquid preparation device 32, the third liquid preparation device 41 and the fourth liquid preparation device 42 can be used in emergency, thereby improving the stability and reliability of the entire liquid supply system 100. Figure 1As shown, in some embodiments, the second liquid return pipeline 92 includes two second liquid return branches, one of which has a liquid inlet end connected to the liquid outlet of the third liquid preparation device 41 and a liquid outlet end connected to the liquid return port of the third liquid preparation device 41; the other of which has a liquid inlet end connected to the liquid outlet of the fourth liquid preparation device and a liquid outlet end connected to the liquid return port of the fourth liquid preparation device.

[0077] Specifically, as shown, Figure 8 for dialysis B liquid, the first liquid preparation device 31 is connected to the third liquid preparation device 41 through a pipeline, the third liquid preparation device 41 stores the dialysis B liquid, and during dialysis, the liquid outlet of the third liquid preparation device 41 is connected to the blood dialysis chamber 8 through a pipeline, part of the dialysis liquid is used for dialysis, and the other part of the dialysis liquid returns to the third liquid preparation device 41 from one of the second liquid return branches; for dialysis A liquid, the second liquid preparation device 32 is connected to the fourth liquid preparation device 42 through a pipeline, the fourth liquid preparation device 42 stores the dialysis B liquid, and during dialysis, the liquid outlet of the fourth liquid preparation device 42 is connected to the blood dialysis chamber 8 through a pipeline, part of the dialysis liquid is used for dialysis, and the other part of the dialysis liquid returns to the fourth liquid preparation device 42 from the other second liquid return branch.

[0078] As shown, Figure 1 , Figures 7-9 In some embodiments, at least one filter 61 and a pressure detector 62 are arranged between the third liquid preparation device 41 and the blood dialysis chamber; at least one filter 61 and a pressure detector 62 are arranged between the fourth liquid preparation device 42 and the blood dialysis chamber. By arranging the filter 61, the particles of the undissolved dialysis powder with large size can be filtered out, and the quality of the dialysis liquid can be improved; by arranging the pressure detector 62, the liquid supply system 100 can be detected in the case of supplying liquid to the blood dialysis chamber 8 and whether the liquid is leaking, and the stability and reliability of the liquid supply can be improved.

[0079] As shown, Figure 1 , Figures 7-9As shown, in some embodiments, a second three-way valve 72 is provided between the third solution preparation device 41 and the first solution preparation device 31; a third three-way valve 73 is provided between the fourth solution preparation device 42 and the second solution preparation device 32. The second three-way valve 72 has three ports, which are respectively connected to the first solution preparation device 31, the third solution preparation device 41, and the hemodialysis chamber 8. The second three-way valve 72 is used to control the first solution preparation device 31 to selectively connect to either the third solution preparation device 41 or the hemodialysis chamber 8. The third three-way valve 73 is provided between the fourth solution preparation device 42 and the second solution preparation device 32. The third three-way valve 73 has three ports, which are respectively connected to the second solution preparation device 32, the fourth solution preparation device 42, and the hemodialysis chamber 8. The second three-way valve 72 can block the connection between the third solution preparation device 41 and the first solution preparation device 31, connecting the first solution preparation device 31 to the hemodialysis chamber 8 and providing dialysis solution B. When one solution preparation device fails, it does not affect the use of the other solution preparation device, further improving the stability and reliability of the solution supply. Similarly, the third three-way valve 73 can block the connection between the fourth solution preparation device 42 and the second solution preparation device 32, connect the second solution preparation device 32 to the hemodialysis chamber 8, and provide dialysis solution A.

[0080] like Figure 8 As shown in the attached diagram, the thick solid lines indicate the liquid feed direction. When the dialysate is fed from the first mixing device 31 to the third mixing device 41, the first mixing device 31 and the third mixing device 41 are connected. The third mixing device 41 can serve as a dialysate storage tank for the first mixing device 31, storing the dialysate prepared by the first mixing device 31. The third mixing device 41 is connected to the hemodialysis chamber 8, and the hemodialysis chamber 8 draws dialysate from the third mixing device 41 when it needs to use it. Similarly, when the dialysate is fed from the second mixing device 32 to the fourth mixing device 42, the second mixing device 32 and the fourth mixing device 42 are connected. The fourth mixing device 42 can serve as a dialysate storage tank for the second mixing device 32, storing the dialysate prepared by the second mixing device 32. The fourth mixing device 42 is connected to the hemodialysis chamber 8, and the hemodialysis chamber 8 draws dialysate from the fourth mixing device 42 when it needs to use it.

[0081] like Figure 9 As shown in the attached diagram, the thick solid line indicates the liquid feed direction. When valve SV6 is open, the inlet container 21 connects to the third solution preparation device 41. The dialysate is prepared in the third solution preparation device 41 and then filtered through filter 61 before entering the hemodialysis chamber 8 for use. Similarly, when valve SV5 is open, the outlet end of the inlet pipe 1 connects to the fourth solution preparation device 42. The dialysate is prepared in the fourth solution preparation device 42 and then filtered through filter 61 before entering the hemodialysis chamber 8 for use.

[0082] like Figure 7As shown in the attached diagram, the thick solid line indicates the liquid feed direction. When the second solution preparation device group 4 malfunctions, the second three-way valve 72 connects the first solution preparation device 31 and the hemodialysis chamber 8. The dialysate is prepared in the first solution preparation device 31 and then filtered through the filter 61 before entering the hemodialysis chamber 8 for use. Similarly, the third three-way valve 73 connects the second solution preparation device 41 and the hemodialysis chamber 8. The dialysate is prepared in the second solution preparation device 41 and then filtered through the filter 61 before entering the hemodialysis chamber 8 for use.

[0083] like Figure 10 As shown in the attached figure, the thick solid line indicates the direction of liquid feeding. During disinfection, the first liquid preparation device 31 is connected to the third liquid preparation device 41, and the disinfectant enters the third liquid preparation device 41 from the first liquid preparation device 31 through the disinfection inlet of the third liquid preparation device 41; the second liquid preparation device 32 is connected to the fourth liquid preparation device 42, and the disinfectant enters the third liquid preparation device 41 from the second liquid preparation device 32 through the disinfection inlet of the fourth liquid preparation device 42.

[0084] In some embodiments, a fourth three-way valve 74 is provided on the first return branch pipe, and one outlet end of the fourth three-way valve 74 is used to discharge liquid; and / or, a fourth three-way valve 74 is provided on the second return branch pipe, and one outlet end of the fourth three-way valve is used to discharge liquid. During disinfection, disinfectant can be discharged from the fourth three-way valve.

[0085] like Figure 10 As shown, in some embodiments, each solution preparation device includes at least two connected solution preparation pumps, with the outlet of one pump connected to the inlet of the adjacent pump. One pump is a venting pump, and the other is a delivery pump. The delivery pump has low power and is used for supplying solutions to the hemodialysis unit, while the venting pump has high power and can be used to clean or vent the tubing. In some embodiments, the return line 9 further includes two common return lines 90 and two fifth three-way valves 75. One fifth three-way valve 75 has three ports, which are respectively connected to one common return line 90, one first return branch, and one second return branch. The other fifth three-way valve 75 has three ports, which are respectively connected to another common return line 90, another first return branch, and another second return branch. One fifth three-way valve 75 controls one common return line to selectively connect to either one first return branch or one second return branch; the other fifth three-way valve controls another common return line 90 to selectively connect to either one first return branch or another second return branch. By providing the fifth three-way valves, the common return line 90 can be selectively connected to either the first liquid distribution device group 3 or the second liquid distribution device group 4, reducing layout costs. Each liquid supply branch of the liquid supply system 100 has two built-in liquid distribution devices, allowing for master-slave use and independent liquid distribution, improving the reliability of the system's liquid supply.

[0086] likeFigure 10 As shown, during disinfection, the emptying pump is opened, disinfectant is introduced into the first liquid return pipeline 91 from the common liquid return pipeline 90 through the fifth three-way valve 75, and then the disinfectant is returned to the first liquid preparation device group 3; the disinfectant can also be introduced into the second liquid return pipeline 91 from the common liquid return pipeline 90 through the fifth three-way valve 75, and then the disinfectant is returned to the second liquid preparation device group 4, for repeated circulation flushing, to improve safety.

[0087] In some embodiments, the liquid inlet device 2 comprises a conductivity sensor and a temperature sensor arranged in the liquid inlet container 21, for detecting the quality and temperature of the reverse osmosis water. When the reverse osmosis water does not meet the requirements for making dialysis solution, it can be discharged from the liquid outlet valve 281 in time, which is beneficial to avoid the reverse osmosis water entering the first liquid preparation device 31, causing contamination and waste of dialysis powder. At the same time, the dialysis solution preparation link is more controllable.

[0088] The liquid supply device of the present application has the following beneficial effects: (1) By arranging the liquid inlet device 2, the reverse osmosis water can be heated in advance, and warm water is directly provided for the dialysis solution, saving preparation time; the dialysis solution does not directly contact the heater, the temperature is more uniform, and the sodium bicarbonate in the dialysis B solution is not easy to decompose and deteriorate. (2) After the liquid inlet device 2 is prepositioned, the preparation of different dialysis A solution and B solution can use the same specification hardware configuration, realizing modular production, resource sharing, and saving cost. By prepositioning the heating module, the entire liquid preparation device and liquid supply system 100 only need to be connected to single-phase power to meet the use requirements, and the use is safer. (3) The liquid inlet device 2 is provided with a reverse osmosis liquid detection sensor to monitor the reverse osmosis water before entering the liquid preparation device, determine the reverse osmosis water condition, and prevent the reverse osmosis water that does not meet the requirements from entering the liquid preparation device to cause safety accidents. (4) Multiple liquid preparation devices with the same hardware can be arranged, at least two liquid preparation devices are used as liquid storage devices for storage when normally operating, and the liquid preparation device can be cut off when a fault occurs, and the liquid storage device plays a liquid preparation role as an emergency plan.

[0089] Other configurations and operations of the liquid supply device according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here. In the description of the present application, "first feature", "second feature" can include one or more features. Among them, the up-down direction, the left-right direction and the front-rear direction are based on the up-down direction, the left-right direction and the front-rear direction shown in the figure.

[0090] In the description of the utility model, unless another definite provision and limitation, first feature is on second feature " above " or " below " can include first and second feature direct contact, also can include first and second feature is not direct contact but is through their between another feature contact. Moreover, first feature is on second feature " above ", " above " and " above " include first feature is on second feature directly above and oblique above, or just indicate first feature horizontal height is higher than second feature.

[0091] In the description of the utility model, the description of reference term " one embodiment ", " some embodiments ", " illustrative embodiment ", " example ", " specific example " or " some examples " etc. means that the specific feature, structure, material or characteristic described in conjunction with the embodiment or example is contained in at least one embodiment or example of the utility model. In the specification, the illustrative representation of the above-mentioned term does not necessarily refer to the same embodiment or example. Moreover, the specific feature, structure, material or characteristic described can be combined in any one or more embodiments or examples in a suitable manner.

[0092] Although the embodiments of the utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and its equivalents.

Claims

1. A liquid supply system characterized by comprising: The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system.

2. The liquid supply system according to claim 1, wherein The application relates to a hemodialysis system. The application relates to a hemodialysis system.

3. The liquid supply system according to claim 1, wherein The application relates to a hemodialysis system. The application relates to a hemodialysis system.

4. The liquid supply system according to claim 1, wherein The application relates to a hemodialysis system.

5. The liquid supply system according to claim 1, wherein The application relates to a hemodialysis system.

6. The liquid supply system according to claim 1, wherein The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system.

7. The liquid supply system according to claim 1, wherein The application relates to a hemodialysis system.

8. The liquid supply system according to claim 7, wherein The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system. The application relates to a hemodialysis system. 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9. The liquid supply system according to claim 8, wherein At least one filter and a pressure detector are arranged between the third liquid preparation device and the hemodialysis chamber, and at least one filter and a pressure detector are arranged between the fourth liquid preparation device and the hemodialysis chamber.

10. The liquid supply system according to claim 8, wherein A second three-way valve is arranged between the third liquid preparation device and the first liquid preparation device, the second three-way valve has three ports, and the three ports are respectively connected to the first liquid preparation device, the third liquid preparation device and the hemodialysis chamber, and the second three-way valve is used to control the first liquid preparation device to be connected to the third liquid preparation device or the hemodialysis chamber; a third three-way valve is arranged between the fourth liquid preparation device and the second liquid preparation device, the third three-way valve has three ports, and the three ports are respectively connected to the second liquid preparation device, the fourth liquid preparation device and the hemodialysis chamber, and the third three-way valve is used to control the second liquid preparation device to be connected to the fourth liquid preparation device or the hemodialysis chamber.

11. The liquid supply system according to claim 10, wherein A fourth three-way valve is arranged on the first liquid return branch, one of the liquid outlets of the fourth three-way valve is used to discharge liquid; and / or A fourth three-way valve is arranged on the second liquid return branch, one of the liquid outlets of the fourth three-way valve is used to discharge liquid.

12. The liquid supply system according to claim 11, wherein The first liquid preparation device, the second liquid preparation device, the third liquid preparation device and the fourth liquid preparation device each comprise a liquid preparation barrel and a liquid preparation pump, and the liquid preparation pump is used to pump the liquid in the liquid preparation barrel to the hemodialysis chamber.

13. The liquid supply system according to claim 12, wherein Each liquid preparation device comprises at least two liquid preparation pumps connected in series, the liquid outlet of one of the liquid preparation pumps is connected to the liquid inlet of another liquid preparation pump adjacent to it; at least one of the liquid preparation pumps is an emptying pump, and at least one of the liquid preparation pumps is a liquid feeding pump.

14. The liquid supply system according to claim 8, wherein The liquid return pipeline further comprises two common liquid return pipelines and two fifth three-way valves, one of the fifth three-way valves has three ports, and the three ports are respectively connected to one of the common liquid return pipelines, one of the first liquid return branches and one of the second liquid return branches; the other fifth three-way valve has three ports, and the three ports are respectively connected to the other common liquid return pipeline, the other first liquid return branch and the other second liquid return branch. One of the fifth three-way valves controls one of the common liquid return pipelines to be connected to one of the first liquid return branches or one of the second liquid return branches; the other fifth three-way valve controls the other common liquid return pipeline to be connected to the other first liquid return branch or the other second liquid return branch.

15. The liquid supply system according to claim 1, wherein The liquid inlet device comprises a conductivity sensor and a temperature sensor arranged in the liquid inlet container, which are used to detect the reverse osmosis water.

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