Pressure-driven dynamic weighing and dosing device
By using a pressure-driven dynamic weighing dosing device, the automatic monitoring of the dosing flow rate is achieved through weight sensors and density calculations. This solves the problem of reduced monitoring accuracy caused by chemical corrosion and scaling, ensuring the stability and precision of the dosing process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG XINDAYU ENVIRONMENTAL PROTECTION TECH CO LTD
- Filing Date
- 2025-07-21
- Publication Date
- 2026-06-19
AI Technical Summary
Existing chemical dosing flow monitoring devices in wastewater treatment are susceptible to corrosion and scaling by the chemical solution, leading to reduced monitoring accuracy.
The pressure-driven dynamic weighing dosing device uses a weight sensor to monitor the weight of the dosing tank in real time, converts it into the dosing volume through a density calculation formula, and calculates the flow rate in conjunction with the dosing time. It avoids contact with the liquid medicine and achieves automatic replenishment by combining with the dosing pump.
It enables precise monitoring of chemical dosing flow rate, reduces monitoring errors caused by chemical corrosion and scaling, and ensures the stability and accuracy of the dosing process.
Smart Images
Figure CN224377694U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of dosing devices, and in particular to a pressure-driven dynamic weighing dosing device. Background Technology
[0002] Wastewater treatment plants need to add chemicals to the wastewater during the treatment process to react with various harmful substances in the wastewater and remove them.
[0003] Currently, chemical dosing is typically performed using either elevated chemical tanks or dosing pumps. Elevated chemical tank dosing involves using a pump to directionally transport the chemical solution from the mixing tank to an elevated tank, and then using gravity to add the solution to the wastewater treatment tank dosing point. To ensure accurate flow rate, contact flow meters are usually installed near each dosing point to periodically monitor the flow rate. Dosing pump dosing involves directly adding the chemical solution from the mixing tank to the wastewater treatment tank dosing point. A contact flow meter is installed after the dosing pump to periodically monitor the flow rate.
[0004] For the aforementioned technologies, whether using elevated chemical tanks or dosing pumps, flow meters are required to monitor the dosing flow rate. In actual operation, because the flow meter's sensing element is in direct contact with the liquid chemical, it is susceptible to corrosion and scaling, which can easily lead to reduced monitoring accuracy. Therefore, there is room for improvement. Utility Model Content
[0005] To facilitate the addition of chemicals to the dosing points of wastewater treatment ponds while achieving accurate monitoring of the dosing flow rate, this application provides a pressure-driven dynamic weighing dosing device.
[0006] This application provides a pressure-driven dynamic weighing and dosing device, which adopts the following technical solution:
[0007] A pressure-driven dynamic weighing dosing device includes a controller and a pressure dosing module;
[0008] The pressure dosing module includes a dosing tank, a dosing inlet assembly, a dosing assembly, and a pressurization assembly;
[0009] The bottom of the dosing tank is connected to several legs, and each leg is equipped with a weight sensor. The weight sensor is connected to the controller and is used to feed back the real-time weight of the dosing tank to the controller.
[0010] The drug delivery assembly includes a drug delivery pipe connected to the drug dosing tank, the drug delivery pipe being connected to the drug mixing tank, the drug delivery pipe being equipped with a drug delivery pump, and the drug delivery pump being connected to the controller;
[0011] The dosing assembly includes a dosing pipe connected to the dosing tank, and the dosing pipe is equipped with a dosing valve;
[0012] The pressurizing component is used to pressurize the dosing tank so that the medicine liquid can be output through the dosing pipe. The pressurizing component includes an air inlet pipe connected to the dosing tank and the air inlet pipe is connected to an air source.
[0013] By adopting the above technical solution, when adding chemicals to the wastewater treatment tank, an air source pressurizes the inside of the dosing tank via an air supply pipe to the pressurization assembly. This allows the chemical solution inside the tank to be transported to the corresponding dosing point via the dosing pipe, achieving automatic dosing at the dosing point. During flow rate monitoring, a weight sensor monitors the tank weight in real time and feeds it back to the controller. The controller obtains the actual dosing weight and converts it into dosing volume using a density calculation formula. Simultaneously, the controller captures the start and end times of dosing to obtain the dosing time. The actual flow rate is calculated using the dosing volume and time. Compared to the traditional method of monitoring flow rate using a contact flow meter, this method eliminates the need for contact with the chemical solution, effectively reducing the risk of decreased flow monitoring accuracy due to chemical corrosion. Furthermore, when the weight of the dosing tank drops to the lower limit, the controller activates the inlet pump to pump the chemical solution from the mixing tank into the dosing tank via the inlet pipe, achieving automatic replenishment of the dosing tank.
[0014] Preferably, each weight sensor is equipped with a leveling bracket at its bottom. The leveling bracket includes a leveling seat, and each of the top corners of the bottom of the leveling seat is provided with a foot cup. The foot cup is threadedly connected to the leveling seat by a screw.
[0015] By adopting the above technical solution, during the operation of the device, the weight sensors can be leveled by rotating the foot cups at the bottom of the leveling seat, thus limiting the possibility that the sensor monitoring error may increase due to uneven ground or cracking and deformation at the pressure point.
[0016] Preferably, the leveling seat has a limiting groove, and the bottom of the weight sensor is embedded in the limiting groove.
[0017] By adopting the above technical solution, the weight sensor can be embedded in the limiting groove, and the limiting groove can be used to limit the weight sensor to prevent it from shifting.
[0018] Preferably, the dosing tank is also equipped with an electronic pressure gauge, and an electro-proportional valve is installed on the air inlet pipe. Both the electronic pressure gauge and the electro-proportional valve are connected to the controller.
[0019] By adopting the above technical solution, the internal pressure data of the dosing tank is fed back to the controller in real time using an electronic pressure gauge. The controller can then control the electric proportional valve to adjust the amount of air entering the dosing tank according to actual needs, thereby making the internal pressure of the dosing tank controllable.
[0020] Preferably, the drug inlet tube is further provided with a drug inlet valve, which is connected to the controller.
[0021] By adopting the above technical solution, after the drug solution is replenished through the drug inlet component, the controller controls the drug inlet valve to close, so as to prevent the drug solution inside the drug tank from flowing back into the drug inlet pipe.
[0022] Preferably, the top of the dosing tank is also provided with a pressure relief assembly, which includes a pressure relief pipe connected to the dosing tank and a pressure relief valve installed on the pressure relief pipe.
[0023] By adopting the above technical solution and setting a pressure regulation threshold, when the pressure inside the dosing tank is too high during the subsequent dosing process, the controller controls the pressure relief valve to open and close cyclically so that excess liquid can be discharged through the pressure relief pipe, which helps to maintain a stable pressure balance inside the dosing tank.
[0024] Preferably, an air storage tank is provided at one end of the air inlet pipe near the air source, and the air inlet end and air outlet end of the air storage tank are respectively connected to the air source and the air inlet pipe.
[0025] By adopting the above technical solution, when the gas source pressure is not stable enough, the compressed air from the gas source is first stored in the gas storage tank, and then the compressed air is input into the dosing tank through the air inlet pipe via the gas storage tank. The gas storage tank is used to buffer pressure fluctuations, so as to reduce the impact of pressure fluctuations on the normal output of the drug liquid inside the subsequent dosing tank.
[0026] Preferably, the bottom of the dosing tank is provided with a venting assembly, which includes a venting pipe connected to the dosing tank and a venting valve installed on the venting pipe.
[0027] By adopting the above technical solution, when the dosing tank needs to be emptied, the emptying valve opens the emptying pipe so that the liquid in the dosing tank can be emptied through the emptying pipe.
[0028] In summary, this application includes at least one of the following beneficial technical effects:
[0029] 1. During normal dosing, the air source pressurizes the dosing tank through the air inlet pipe, causing the liquid medicine in the tank to be transported to the dosing point through the dosing pipe. During the dosing flow monitoring period, the controller obtains the actual dosing weight through the weight sensor, and then converts the dosing weight into the dosing volume through the density calculation formula. At the same time, the controller obtains the dosing duration through the dosing start and end time, and calculates the actual dosing flow rate using the dosing volume and dosing duration, thus realizing automatic monitoring of the dosing flow rate.
[0030] 2. By installing a leveling bracket at the bottom of the weight sensor, the weight sensor can be leveled, thus limiting the increase in gravity monitoring error caused by uneven ground.
[0031] 3. When the controller detects that the weight of the dosing tank is lower than the lower limit through the weight sensor, the controller can start the dosing pump to pump the liquid medicine into the dosing tank through the dosing pipe, so as to realize the automatic replenishment of the liquid medicine in the dosing tank. Attached Figure Description
[0032] Figure 1 This is a schematic diagram of the structure of the dosing device used in Embodiment 1.
[0033] Figure 2 This is a schematic diagram of the leveling bracket used in Embodiment 1.
[0034] Figure 3 This is a schematic diagram of the structure of the dosing device used in Embodiment 1.
[0035] Explanation of reference numerals in the attached figures:
[0036] 1. Dosing tank; 10. Electronic pressure gauge; 11. Support leg; 12. Weight sensor; 13. Leveling bracket; 131. Leveling seat; 132. Foot cup; 133. Limiting groove; 2. Dosing pipe; 21. Dosing pump; 22. Dosing valve; 3. Dosing pipe; 31. Dosing valve; 4. Air inlet pipe; 41. Electro-proportional valve; 42. Air inlet valve; 43. Air tank; 5. Pressure relief pipe; 51. Pressure relief valve; 6. Drain pipe; 61. Drain valve. Detailed Implementation
[0037] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.
[0038] This application discloses a pressure-driven dynamic weighing and dosing device.
[0039] Example 1
[0040] A pressure-driven dynamic weighing dosing device, referring to Figure 1 It includes a controller and a pressure dosing module, with the controller using an existing controller. The pressure dosing module includes a dosing tank 1, a dosing inlet assembly, a dosing assembly, and a pressurization assembly.
[0041] Reference Figure 1The dosing tank 1 is used to store the drug solution. In this embodiment, the dosing tank 1 is made of pressure-resistant and corrosion-resistant stainless steel. Several support legs 11 are vertically welded to the bottom of the dosing tank 1. Each support leg 11 is equipped with a weight sensor 12. Specifically, the weight sensor 12 is a resistance strain gauge weighing sensor. The weight sensor 12 is connected to the controller and is used to feed back the real-time weight of the dosing tank 1 to the controller.
[0042] Reference Figure 1 and Figure 2 Each weight sensor 12 is equipped with a leveling bracket 13 at its bottom. The leveling bracket 13 includes a leveling seat 131, which is made of alloy steel plate and has an overall equilateral triangular shape. Each apex of the leveling bracket 13 has a foot cup 132, and the screws of the foot cups 132 are vertically threaded through the leveling seat 131. During subsequent use, the weight sensor 12 can be leveled by rotating the foot cups 132 at the bottom of the leveling seat 131, allowing the weight sensor 12 to more accurately acquire the weight data of the dosing tank 1.
[0043] Reference Figure 1 and Figure 2 A limiting groove 133 is provided in the middle of the upper surface of the leveling seat 131 corresponding to the weight sensor 12. The bottom of the weight sensor 12 is embedded in the limiting groove 133 to limit the gravity support.
[0044] Reference Figure 1 An electronic pressure gauge 10 is installed on the top of the dosing tank 1. The electronic pressure gauge 10 is connected to the controller and is used to provide feedback on the real-time pressure of the dosing tank 1 to the controller.
[0045] Reference Figure 1 The drug feeding assembly includes a drug feeding pipe 2, one end of which is connected to the dosing tank 1, and the other end of which is connected to the mixing tank. The drug feeding pipe 2 is equipped with a drug feeding pump 21 and a drug feeding valve 22. Both the drug feeding pump 21 and the drug feeding valve 22 are connected to a controller. Specifically, the drug feeding pump 21 is a self-priming pump, and the drug feeding valve 22 is an electric ball valve.
[0046] Reference Figure 1 The dosing assembly includes a dosing pipe 3, one end of which is connected to the dosing tank 1, and the other end of which is connected to the dosing point of the wastewater treatment tank. A dosing valve 31 is installed at the end of the dosing pipe 3 closest to the pipe; the dosing valve 31 is connected to the controller, specifically, the dosing valve 31 is an electric ball valve.
[0047] Reference Figure 1The pressurization assembly is used to pressurize the dosing tank 1 with air, so that the liquid medicine in the dosing tank 1 can be output through the dosing pipe 3. The pressurization assembly includes an air inlet pipe 4, one end of which is connected to the dosing tank 1, and the other end of which is connected to an air source. An electro-proportional valve 41 and an air inlet valve 42 are also installed on the air inlet pipe 4; the air inlet valve 42 is an electric ball valve. Both the electro-proportional valve 41 and the electric ball valve are connected to the controller. The electro-proportional valve 41 is designed so that when the dosing tank 1 is pressurized with air from the air source, the controller can adjust the air intake of the dosing tank 1 according to actual needs by controlling the electro-proportional valve 41, thereby achieving controllable internal pressure of the dosing tank 1.
[0048] When performing dosing operations through the dosing device, the controller opens the air inlet valve 42 and the dosing valve 31; the air source pressurizes the dosing pipe 3 through the air inlet pipe 4, so as to transport the liquid medicine in the dosing tank 1 to the corresponding dosing point in the sewage treatment pond through the dosing pipe 3.
[0049] When measuring the dosing flow rate, the controller obtains the weight of the dosing through the weight sensor 12. Based on the density parameter ρ of the liquid, the dosing weight m is converted into the dosing volume V using the density calculation formula V=m / ρ. At the same time, the controller captures the start and end times of the dosing to obtain the dosing duration T. Finally, the actual dosing flow rate Q is calculated using the flow rate calculation formula Q=V / T, realizing automatic monitoring of the dosing flow rate. Compared with traditional contact sensors, there is no need to contact the liquid during the monitoring process, effectively avoiding the impact of factors such as liquid corrosion and scaling on the accuracy of flow monitoring.
[0050] In actual operation, the upper and lower limits of the weight of the dosing tank 1 are set in advance. When the real-time weight of the dosing tank 1 drops to the lower limit, the controller closes the air inlet valve 42 and opens the inlet valve 22 and the inlet pump 21. The inlet pump 21 is used to pump the liquid from the mixing tank to the dosing tank 1 to achieve automatic replenishment of the liquid in the dosing tank 1.
[0051] Reference Figure 1 The dosing tank 1 is also equipped with a pressure relief assembly, which includes a pressure relief pipe 5. One end of the pressure relief pipe 5 is connected to the top of the dosing pipe 3, and a pressure relief valve 51 is installed at the end of the pressure relief pipe 5 closest to the dosing tank 1. The pressure relief valve 51 is connected to the controller. During subsequent dosing of chemicals into the dosing tank 1 through the dosing assembly, when the internal pressure of the dosing tank 1 exceeds the pre-set adjustment threshold, the controller controls the pressure relief valve 51 to open and close cyclically, so that the flow inside the dosing tank 1 is discharged through the pressure relief valve 51 to maintain a stable pressure balance inside the dosing tank 1. The end of the pressure relief pipe 5 furthest from the dosing tank 1 is connected to the mixing tank, facilitating the discharge of the liquid chemicals into the mixing tank and reducing waste of the liquid chemicals.
[0052] Reference Figure 1The bottom of the dosing tank 1 is equipped with a venting assembly, which includes a venting pipe 6 connected to the bottom of the dosing tank 1. A venting valve 61 is installed on the venting pipe 6. The venting valve 61 is an electric ball valve and is connected to a controller. When it is necessary to clean the residual liquid inside the dosing tank 1, the controller can open the venting valve 61 to allow the residual liquid inside the dosing tank 1 to be vented through the venting pipe 6.
[0053] The implementation principle of Example 1 is as follows:
[0054] During the dosing process, the controller opens the air inlet valve 42 at the pressurization component and the dosing valve 31 at the dosing component, and the pressurization component pressurizes the dosing tank 1 so that the liquid medicine inside the dosing tank 1 is transported to the dosing point through the dosing pipe 3, thereby realizing automatic dosing at the dosing point.
[0055] When monitoring the dosing flow rate, the controller obtains the dosing weight through the weight sensor 12 at the bottom of the dosing tank 1. Based on the density formula, the dosing weight is converted into the dosing volume. At the same time, the controller obtains the dosing duration by capturing the dosing start time and dosing end time. Based on the flow formula, the actual dosing flow rate is obtained by combining the dosing volume and the dosing duration.
[0056] During the replenishment process, the controller closes the air inlet valve 42 and opens the drug inlet valve 22 and the drug inlet pump 21. The drug inlet pump 21 is used to pump the drug solution from the preparation tank into the drug dosing tank 1, thereby achieving automatic replenishment of the drug solution in the drug dosing tank 1.
[0057] Example 2
[0058] The difference between Example 2 and Example 1 is that: (Refer to...) Figure 2 An air storage tank 43 is installed at the end of the air inlet pipe 4 furthest from the dosing tank 1. The air inlet of the air storage tank 43 is connected to the air source, and the air outlet of the air storage tank 43 is connected to the air inlet pipe 4. When the air source pressure is insufficient or the pressure fluctuates greatly, compressed air can be stored in the air storage tank 43 first, and then compressed air can be supplied through the air storage tank 43 to achieve a stable supply of compressed air.
[0059] The implementation principle of Example 2 is the same as that of Example 1, so it will not be described again.
[0060] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A pressure-driven dynamic weighing and dosing device, characterized in that: Includes controller and pressure dosing module; The pressure dosing module includes a dosing tank (1), a dosing inlet assembly, a dosing assembly, and a pressurization assembly; The bottom of the dosing tank (1) is connected to several legs (11), and each leg (11) is equipped with a weight sensor (12); the weight sensor (12) is connected to the controller, and the weight sensor (12) is used to feed back the real-time weight of the dosing tank (1) to the controller; The drug feeding assembly includes a drug feeding pipe (2) connected to the drug dosing tank (1), the drug feeding pipe (2) is connected to the drug preparation tank, the drug feeding pipe (2) is equipped with a drug feeding pump (21), and the drug feeding pump (21) is connected to the controller; The dosing assembly includes a dosing pipe (3) connected to the dosing tank (1), and the dosing pipe (3) is equipped with a dosing valve (31); The pressurizing component is used to pressurize the dosing tank (1) to output the liquid medicine through the dosing pipe (3). The pressurizing component includes an air inlet pipe (4) connected to the dosing tank (1) and the air inlet pipe (4) is connected to an air source.
2. The pressure-driven dynamic weighing and dosing device according to claim 1, characterized in that: Each weight sensor (12) is equipped with a leveling bracket (13) at its bottom. The leveling bracket (13) includes a leveling seat (131). Each top corner of the bottom of the leveling seat (131) is provided with a foot cup (132). The foot cup (132) is threadedly connected to the leveling seat (131).
3. The pressure-driven dynamic weighing dosing device according to claim 2, characterized in that: The leveling seat (131) has a limiting groove (133), and the bottom of the weight sensor (12) is embedded in the limiting groove (133).
4. The pressure-driven dynamic weighing and dosing device according to claim 1, characterized in that: The dosing tank (1) is also equipped with an electronic pressure gauge (10), and an electric proportional valve (41) is installed on the air inlet pipe (4). Both the electronic pressure gauge (10) and the electric proportional valve (41) are connected to the controller.
5. The pressure-driven dynamic weighing and dosing device according to claim 1, characterized in that: The inlet pipe (2) is also equipped with an inlet valve (22), which is connected to the controller.
6. The pressure-driven dynamic weighing and dosing device according to claim 5, characterized in that: The top of the dosing tank (1) is also provided with a pressure relief assembly, which includes a pressure relief pipe (5) connected to the dosing tank (1) and a pressure relief valve (51) installed on the pressure relief pipe (5).
7. The pressure-driven dynamic weighing and dosing device according to claim 1, characterized in that: An air storage tank (43) is provided at one end of the air inlet pipe (4) near the air source. The air inlet end and the air outlet end of the air storage tank (43) are respectively connected to the air source and the air inlet pipe (4).
8. The pressure-driven dynamic weighing and dosing device according to claim 1, characterized in that: The bottom of the dosing tank (1) is provided with a venting assembly, which includes a venting pipe (6) connected to the dosing tank (1) and a venting valve (61) installed on the venting pipe (6).