Dosing system

Abstract

The utility model relates to the technical field of water treatment dosing equipment, and discloses a dosing system. The dosing system comprises a liquid inlet main pipe, a Venturi jet device, a hydraulic proportioning pump and a liquid inlet branch pipe, the liquid inlet branch pipes and the liquid inlet main pipe are used for liquid circulation. Wherein the Venturi jet device is arranged on the liquid inlet main pipe; the liquid inlet end of the liquid inlet branch pipe is communicated with the liquid inlet end of the Venturi jet device, and the liquid outlet end of the liquid inlet branch pipe is communicated with a throat pipe of the Venturi jet device; the hydraulic proportioning pump is arranged on the liquid inlet branch pipe, and a chemical suction port of the hydraulic proportioning pump is used for sucking chemicals into the liquid inlet branch pipe to form mixed liquid; and the venturi jet device is used for sucking the mixed liquid into the liquid inlet main pipe to form a diluent and discharging the diluent. The chemical dosing device effectively solves the problems that a chemical dosing device in the prior art cannot ensure that the concentration of chemicals in a pipeline is constant, and backflow is prone to occurring.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment dosing equipment, in particular to a dosing system. Background Art

[0002] In water treatment, gardening and other industries, electric metering pumps are generally used to add chemicals due to the need to add chemicals. However, the working principle of electric metering pumps is a pulsed dosing method. The amount of chemicals added is constant and cannot change with the change of water flow rate. This makes the concentration of chemicals in the water unstable, fluctuating, affecting the actual use effect of the chemicals.

[0003] At the same time, when the water flow pressure is higher than the output pressure of the electric metering pump, the agent cannot be injected into the water flow, or when the water flow pressure fluctuates, the agent is prone to backflow. In addition, when the use environment requires explosion-proof, the electric metering pump must use an explosion-proof motor, which is responsible for operation and maintenance and has high use costs.

[0004] Therefore, how to ensure the constant concentration of the drug in the pipeline and prevent the backflow of the drug are problems that the industry urgently needs to solve. Utility Model Content

[0005] The utility model provides a drug adding system, which is used to solve the defects of the drug adding device in the prior art that the drug concentration in the pipeline cannot be ensured to be constant and backflow is easy to occur.

[0006] The utility model provides a drug adding system, comprising:

[0007] Liquid inlet pipe;

[0008] A venturi ejector is arranged on the liquid inlet main pipe;

[0009] A liquid inlet branch pipe, wherein the liquid inlet end of the liquid inlet branch pipe is connected to the liquid inlet end of the venturi ejector, and the liquid outlet end of the liquid inlet branch pipe is connected to the throat of the venturi ejector;

[0010] A hydraulic proportional pump is arranged on the liquid inlet branch pipe, and a medicine suction port of the hydraulic proportional pump is used to suck the medicine into the liquid inlet branch pipe to form a mixed liquid;

[0011] The venturi ejector is used to suck the mixed liquid into the liquid inlet main pipe to form a diluted liquid, and discharge the diluted liquid.

[0012] The dosing system provided by the utility model also includes:

[0013] The flow regulating member is arranged on the liquid inlet branch pipe, or arranged on the liquid inlet main pipe.

[0014] The dosing system provided by the utility model also includes:

[0015] The flow detection component is arranged on the liquid inlet branch pipe; or, is arranged on the drug suction port of the hydraulic proportional pump.

[0016] The dosing system provided by the utility model also includes:

[0017] The pressure regulating member is arranged between the liquid inlet end of the liquid inlet branch pipe and the liquid inlet end of the hydraulic proportional pump.

[0018] The dosing system provided by the utility model also includes:

[0019] The pressure detecting component is arranged between the pressure regulating component and the hydraulic proportional pump.

[0020] According to the dosing system provided by the utility model, the diameter of the liquid inlet main pipe is larger than the diameter of the liquid inlet branch pipe.

[0021] According to the dosing system provided by the utility model, the diameter of the liquid inlet main pipe is 1 to 20 times the diameter of the liquid inlet branch pipe.

[0022] The dosing system provided by the utility model also includes:

[0023] A medicine adding box, wherein the medicine outlet of the medicine adding box is connected with the medicine suction port of the hydraulic proportional pump.

[0024] The dosing system provided by the utility model also includes:

[0025] The filter is arranged on the medicine outlet passage of the medicine adding box and is used for filtering medicine.

[0026] The dosing system provided by the utility model also includes:

[0027] The shell, the liquid inlet main pipe, the venturi ejector, the hydraulic proportional pump and the liquid inlet branch pipe are integrated in the shell, and the medicine adding box is arranged outside the shell and connected to the shell.

[0028] The utility model provides a dosing system, which can play a role in diverting the liquid inlet main pipe by setting a liquid inlet branch pipe, avoiding the problem of a sharp increase in liquid flow and damaging the equipment on the pipeline, and plays a role in protecting the hydraulic proportional pump and the venturi ejector. By setting a hydraulic proportional pump, the hydraulic proportional pump can absorb the agent in proportion to the change of the liquid flow entering the hydraulic proportional pump, and the absorbed agent is mixed with the liquid in the liquid inlet branch to form a mixed liquid. The mixed liquid is sucked by the venturi ejector and flows into the liquid inlet main pipe, so that the concentration of the agent in the liquid inlet main pipe is maintained constant. By arranging a venturi ejector on the liquid inlet main pipe, and the throat of the venturi ejector is connected to the liquid outlet of the liquid inlet branch pipe, the liquid flowing from the liquid inlet main pipe into the venturi ejector, when passing through the venturi ejector, the cross section of the flow channel at the throat entrance suddenly changes from contraction to a straight section, and the inertia of the water flow causes it to generate a certain vacuum around the inner tube wall of the throat, thereby forming a negative pressure, thereby achieving the purpose of sucking the mixed liquid from the liquid inlet branch pipe, and ensuring that when the liquid pressure or flow in the liquid inlet main pipe fluctuates, the mixed liquid in the liquid inlet branch pipe can still continuously enter the main pipe, preventing the occurrence of backflow. Therefore, this embodiment can solve the problem that the dosing device in the prior art cannot ensure the constant concentration of the drug in the pipeline and is prone to backflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a structural schematic diagram of the dosing system provided by the utility model, and the arrows in the figure represent the flow direction of the liquid;

[0031] Figure 2 It is a cross-sectional structural diagram of a hydraulic proportional pump of a dosing system provided by the utility model, wherein arrows in the diagram represent the flow direction of liquid.

[0032] Reference numerals:

[0033] 10. Liquid inlet main pipe; 20. Liquid inlet branch pipe; 30. Connecting pipe;

[0034] 100. Venturi ejector;

[0035] 200, hydraulic proportional pump; 210, housing; 220, motor; 230, medicine suction tube; 240, proportional adjustment sleeve; 250, proportional limit card; 260, push rod;

[0036] 300, add medicine box;

[0037] 400, flow regulating member;

[0038] 500, flow detection parts;

[0039] 600, pressure regulating parts;

[0040] 700. Filter. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0043] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0044] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0046] Combine the following Figure 1 and Figure 2 The dosing system of the utility model is described in detail. Figure 1 It is a structural schematic diagram of the dosing system provided by the utility model, and the arrows in the figure represent the flow direction of the liquid; Figure 2 It is a cross-sectional structural diagram of a hydraulic proportional pump of a dosing system provided by the utility model, wherein arrows in the diagram represent the flow direction of liquid.

[0047] like Figure 1 As shown, the specific embodiment of the first aspect of the utility model provides a dosing system. The dosing system includes a liquid inlet main pipe 10, a venturi ejector 100, a hydraulic proportional pump 200 and a liquid inlet branch pipe 20; the liquid inlet branch pipe 20 and the liquid inlet main pipe 10 are used for liquid circulation.

[0048] Among them, the venturi ejector 100 is arranged on the liquid inlet main pipe 10; the liquid inlet end of the liquid inlet branch pipe 20 is connected with the liquid inlet end of the venturi ejector 100, and the liquid outlet end of the liquid inlet branch pipe 20 is connected with the throat of the venturi ejector 100; the hydraulic proportional pump 200 is arranged on the liquid inlet branch pipe 20, and the drug suction port of the hydraulic proportional pump 200 is used to suck the agent into the liquid inlet branch pipe 20 to form a mixed liquid; the venturi ejector 100 is used to suck the mixed liquid into the liquid inlet main pipe 10 to form a diluted liquid, and discharge the diluted liquid. Specifically, the liquid inlet of the venturi ejector 100 is connected to the liquid inlet of the liquid inlet main pipe 10, and the liquid outlet of the venturi ejector 100 is connected to the liquid outlet of the liquid inlet main pipe 10; the liquid inlet of the liquid inlet branch pipe 20 is connected to the liquid inlet of the liquid inlet main pipe 10, and part of the liquid flowing in from the liquid inlet of the liquid inlet main pipe 10 flows into the venturi ejector 100, and part of the liquid flows into the liquid inlet branch pipe 20, and the liquid outlet of the liquid inlet branch pipe 20 is connected to the venturi ejector 100 through the hydraulic proportional pump 200. 00; the medicine suction port of the hydraulic proportional pump 200 is used to suck the medicine into the hydraulic proportional pump 200, and the medicine is mixed with the liquid in the liquid inlet branch pipe 20 to form a mixed liquid, and then flows to the venturi ejector 100; the venturi ejector 100 is used to suck the mixed liquid into the liquid inlet main pipe 10, and the mixed liquid is mixed with the liquid in the liquid inlet main pipe 10 for a second time to form a diluted liquid, and the venturi ejector 100 is also used to discharge the diluted liquid, and the diluted liquid re-enters the liquid inlet main pipe 10.

[0049] In a specific embodiment of the utility model, by providing the liquid inlet branch pipe 20, it can play a role in diverting the liquid inlet main pipe 10, avoiding the problem of a sharp increase in liquid flow and damaging the equipment on the pipeline, and playing a role in protecting the hydraulic proportional pump 200 and the venturi ejector 100. By providing the hydraulic proportional pump 200, the hydraulic proportional pump 200 can absorb the agent in proportion to the change in the liquid flow entering the hydraulic proportional pump 200, and the absorbed agent is mixed with the liquid in the liquid inlet branch to form a mixed liquid, which is sucked by the venturi ejector 100 and flows into the liquid inlet main pipe 10, so that the concentration of the agent in the liquid inlet main pipe 10 is maintained constant. By arranging the venturi ejector 100 on the liquid inlet main pipe 10, and the throat of the venturi ejector 100 is connected with the liquid outlet of the liquid inlet branch pipe 20, the liquid flowing from the liquid inlet main pipe 10 into the venturi ejector 100, when passing through the venturi ejector 100, the cross section of the flow channel at the throat entrance suddenly changes from contraction to a straight section, and the inertia of the water flow causes it to generate a certain vacuum around the inner tube wall of the throat, thereby forming a negative pressure, thereby achieving the purpose of sucking the mixed liquid from the liquid inlet branch pipe 20, and ensuring that when the liquid pressure or flow in the liquid inlet main pipe 10 fluctuates, the mixed liquid in the liquid inlet branch pipe 20 can still continuously enter the main pipe, preventing the occurrence of backflow. Therefore, this embodiment can solve the problem that the dosing device in the prior art cannot ensure the constant concentration of the drug in the pipeline and is prone to backflow.

[0050] Furthermore, in this embodiment, dosing is achieved by a liquid-driven hydraulic proportional pump 200, without the need for an explosion-proof motor, making the dosing system of this embodiment suitable for scenarios requiring explosion-proof. Compared with the existing solution of dosing by an electric proportional pump, the dosing system of this embodiment has lower costs and is safer and more reliable.

[0051] It can be understood that the hydraulic proportional pump 200 is also called a hydraulic proportional dosing pump, which can be purchased, and the specific model can be selected according to the specific application scenario.

[0052] like Figure 2 As shown, in some embodiments, the hydraulic proportional pump 200 includes a housing 210 , a motor 220 , a drug suction tube 230 , a proportional adjustment sleeve 240 , a proportional limit card 250 , and a push rod 260 .

[0053] Among them, a accommodating cavity is provided in the shell 210, and a liquid inlet and a liquid outlet are provided on the shell 210; the motor 220 is provided in the accommodating cavity; the upper end of the drug suction tube 230 is located in the accommodating cavity, and the lower part is located outside the shell 210, and a drug suction port is provided on the drug suction tube 230, and the drug suction tube 230 is provided with a drug outlet connected to the accommodating cavity, specifically, the drug outlet faces the liquid outlet of the shell 210; the push rod 260 is located in the drug suction tube 230, and the upper end of the push rod 260 is connected to the motor 220, and the lower end is suspended; the proportional adjustment sleeve 240 is sleeved on the outside of the drug suction tube 230, for adjusting the opening of the drug suction hole to adjust the concentration of the drug entering the drug suction tube 230; the proportional limit card 250 is connected to the proportional adjustment sleeve 240 for fixing the proportional adjustment sleeve 240. The liquid in the liquid inlet branch enters the hydraulic proportional pump 200. As the liquid continues to flow in the liquid inlet branch, the motor 220 in the hydraulic proportional pump 200 is driven by the liquid flow to continuously move up and down, and while squeezing out the liquid flowing in from the liquid inlet branch 20, the motor 220 also drives the push rod 260 through continuous up and down movement to directly suck the medicine into the medicine suction port and dissolve it in the water flow, thereby achieving the effect of uniformly and continuously adding the medicine to the flowing liquid as the liquid flows. In addition, the proportional adjustment sleeve 240 of the hydraulic proportional pump 200 can proportionally adjust the concentration of the medicine sucked into the medicine suction port. After determining the proportion of the inhaled medicine, the proportion is fixed by the proportional limit card 250 to prevent changes in the dosing ratio due to vibration and other reasons.

[0054] In a specific embodiment of the utility model, the dosing system further includes a flow regulating member 400; the flow regulating member 400 is arranged on the liquid inlet branch pipe 20, or arranged on the liquid inlet main pipe 10. In this embodiment, the flow rate of the liquid entering the hydraulic proportional pump 200 can be adjusted by the arrangement of the flow regulating member 400, so that the liquid flow entering the hydraulic proportional pump 200 meets the working flow required by the hydraulic proportional pump 200, thereby improving the operating safety of the hydraulic proportional pump 200. In addition, by the arrangement of the flow regulating member 400, the flow rate of the liquid entering the liquid inlet branch pipe can be adjusted by the flow regulating member 400, thereby adjusting the flow rate of the medicament absorbed by the hydraulic proportional pump 200. Compared with the use of the hydraulic proportional pump 200 alone, the flow rate entering the hydraulic proportional pump 200 can be ensured to be small enough by the action of the flow regulating member 400, and then further through the secondary suction and mixing action of the venturi ejector 100, the lower limit of the medicament absorption of the entire dosing system is lower than that of the single hydraulic proportional pump.

[0055] In some embodiments, the flow regulating member 400 is a flow regulating valve. Specifically, the flow regulating valve is disposed on the liquid inlet branch pipe 20 and is located between the liquid inlet end of the liquid inlet branch pipe 20 and the liquid inlet end of the hydraulic proportional pump 200 .

[0056] In the specific implementation of the present invention, the dosing system also includes a flow detection component 500; the flow detection component 500 is arranged on the liquid inlet branch 20; or, it is arranged on the drug suction port of the hydraulic proportional pump 200, which can detect the liquid flow after adjustment by the flow adjustment component 400, to ensure that the liquid flow meets the working flow required by the hydraulic proportional pump 200, and the liquid flow of the liquid inlet branch meets the needs.

[0057] In a specific embodiment of the utility model, the dosing system also includes a pressure regulating member 600; the pressure regulating member 600 is arranged between the liquid inlet end of the liquid inlet branch pipe 20 and the liquid inlet end of the hydraulic proportional pump 200, and can adjust the pressure of the liquid entering the hydraulic proportional pump 200, so that the liquid pressure meets the working pressure required by the hydraulic proportional pump 200, and avoids the problem that the liquid pressure fluctuates and affects the stability of the drug absorption. If the liquid pressure is too high, the pressure regulating member 600 also plays a role in reducing pressure, ensuring that the adjusted liquid pressure is always within the tolerance range of the hydraulic proportional pump 200, so that the hydraulic proportional pump 200 can work more stably and better, and ensure that the dosing system is not affected by the fluctuation of water pressure and works stably.

[0058] In some embodiments, the pressure regulating member 600 is a pressure regulating valve. Specifically, the pressure regulating valve is arranged between the liquid inlet and the flow regulating valve of the hydraulic proportional pump 200. The liquid regulated by the flow regulating valve and the pressure proportional valve enters the hydraulic proportional pump 200. As the liquid continuously flows in the liquid inlet branch, the motor 220 in the hydraulic proportional pump 200 is driven by the liquid flow to continuously move up and down, and while the liquid flowing in from the liquid inlet branch 20 is pressed out, the motor 220 also drives the push rod 260 to directly suck the medicine into the medicine suction port and dissolve it in the water flow by continuously moving up and down, thereby achieving the effect of adding the medicine to the flowing liquid evenly and continuously as the liquid flows. In addition, the proportional adjustment sleeve 240 of the hydraulic proportional pump 200 can proportionally adjust the concentration of the medicine sucked into the medicine suction port. After determining the proportion of the medicine sucked, the proportion is fixed by the proportional limit card 250 to prevent the change of the dosing proportion due to vibration and other reasons.

[0059] In a specific embodiment of the present utility model, the dosing system includes a pressure detection component; the pressure detection component is arranged on the liquid inlet branch pipe 20, and the pressure detection component is located between the pressure regulating component 600 and the hydraulic proportional pump 200. The accuracy of the pressure regulating component 600 is judged by the pressure detection component. Specifically, the pressure detection component includes at least one of a pressure gauge or a water pressure sensor.

[0060] In a specific embodiment of the present utility model, the diameter of the liquid inlet main pipe 10 is larger than the diameter of the liquid inlet branch pipe 20, so that the liquid flow rate entering the liquid inlet main pipe 10 is larger than the liquid flow rate in the liquid inlet branch pipe 20. Because the diameter of the liquid inlet branch pipe 20 is smaller, there is a pressure loss after the liquid enters the liquid inlet branch pipe 20. Therefore, when the pressure regulating valve does not adjust the pressure, the water pressure at various locations on the liquid inlet branch pipe 20 is still lower than the water pressure of the liquid inlet main pipe 10, which plays a role in protecting the hydraulic proportional pump 200.

[0061] In some embodiments, the diameter of the liquid inlet main pipe 10 is 1 to 20 times the diameter of the liquid inlet branch pipe 20. Specifically, the diameter of the liquid inlet main pipe 10 is twice the diameter of the liquid inlet branch pipe 20.

[0062] In a specific embodiment of the present invention, the dosing system further includes a dosing box 300; the drug outlet of the dosing box 300 is connected to the drug suction port of the hydraulic proportional pump 200. The dosing box 300 is used to store drugs and provide drugs for the dosing system. Specifically, the drug outlet of the dosing box 300 is connected to the drug suction port of the hydraulic proportional pump 200 through a connecting pipe 30.

[0063] In a specific embodiment of the utility model, the dosing system further includes a filter 700; the filter 700 is disposed on the drug outlet passage of the dosing box 300, and is used to filter the medicine to prevent the medicine from deteriorating or impurities mixed therein from causing blockage of the medicine suction port of the hydraulic proportional pump 200. Specifically, one end of the connecting pipe 30 away from the hydraulic proportional pump 200 is located inside the dosing box 300, and penetrates to the bottom of the dosing box 300, ensuring that the medicine at the bottom of the dosing box 300 can be added to the liquid inlet branch 20, avoiding waste of medicine. The filter 700 is disposed on the connecting pipe 30, and is located in the dosing box 300, to filter the medicine, to prevent the medicine from deteriorating or impurities mixed therein from causing blockage of the medicine suction port of the hydraulic proportional pump 200.

[0064] In a specific embodiment of the utility model, a housing is also included; a liquid inlet main pipe 10, a venturi ejector 100, a hydraulic proportional pump 200 and a liquid inlet branch pipe 20 are integrated in the housing; and a dosing box 300 is located outside the housing and connected to the housing. The integrated design facilitates carrying the dosing system and is convenient for use.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A dosing system, characterized in that: include: Liquid inlet main pipe (10); A venturi ejector (100) is arranged on the liquid inlet main pipe (10); a liquid inlet branch pipe (20), wherein the liquid inlet end of the liquid inlet branch pipe (20) is connected to the liquid inlet end of the venturi ejector (100), and the liquid outlet end of the liquid inlet branch pipe (20) is connected to the throat of the venturi ejector (100); A hydraulic proportional pump (200) is arranged on the liquid inlet branch pipe (20), and a medicine suction port of the hydraulic proportional pump (200) is used to suck the medicine into the liquid inlet branch pipe (20) to form a mixed liquid; The venturi ejector (100) is used to suck the mixed liquid into the liquid inlet main pipe (10) to form a diluted liquid, and to discharge the diluted liquid.

2. The dosing system according to claim 1, characterized in that: Also includes: The flow regulating member (400) is arranged on the liquid inlet branch pipe (20), or is arranged on the liquid inlet main pipe (10).

3. The dosing system according to claim 2, characterized in that: Also includes: The flow detection component (500) is arranged on the liquid inlet branch pipe (20); or, is arranged on the medicine suction port of the hydraulic proportional pump (200).

4. The dosing system according to claim 1, characterized in that: Also includes: The pressure regulating member (600) is arranged between the liquid inlet end of the liquid inlet branch pipe (20) and the liquid inlet end of the hydraulic proportional pump (200).

5. The dosing system according to claim 4, characterized in that: Also includes: A pressure detection component is arranged between the pressure regulating component (600) and the hydraulic proportional pump (200).

6. The dosing system according to claim 1, characterized in that: The diameter of the liquid inlet main pipe (10) is greater than the diameter of the liquid inlet branch pipe (20).

7. The dosing system according to claim 6, characterized in that: The diameter of the liquid inlet main pipe (10) is 1 to 20 times the diameter of the liquid inlet branch pipe (20).

8. The dosing system according to any one of claims 1 to 7, characterized in that: Also includes: A medicine adding box (300), wherein the medicine outlet of the medicine adding box (300) is connected to the medicine suction port of the hydraulic proportional pump (200).

9. The dosing system according to claim 8, characterized in that: Also includes: The filter (700) is arranged on the medicine outlet passage of the medicine adding box (300) and is used for filtering medicine.

10. The dosing system according to claim 8, characterized in that: Also includes: The liquid inlet main pipe (10), the venturi ejector (100), the hydraulic proportional pump (200) and the liquid inlet branch pipe (20) are integrated in the shell, and the drug adding box (300) is arranged outside the shell and connected to the shell.

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