Dosing device

Abstract

The utility model provides a chemical feeding device which comprises a chemical feeding barrel and a spraying water tank, and further comprises a chemical feeding pipe, two ends of which are respectively communicated with the chemical feeding barrel and the spraying water tank, so that liquid in the chemical feeding barrel flows to the spraying water tank through the chemical feeding pipe; the PH value testing mechanism is used for measuring the PH value of liquid in the spraying water tank; the first electromagnetic valve is arranged between the dosing barrel and a water source, when the first electromagnetic valve is opened, the water source is communicated with the dosing barrel, and when the first electromagnetic valve is closed, the water source is not communicated with the dosing barrel; the PH value testing mechanism is electrically connected with the first electromagnetic valve; the PH value testing mechanism is further used for sending a first level signal to the first electromagnetic valve when the PH value is smaller than a set value, and sending a second level signal to the first electromagnetic valve when the PH value is larger than or equal to the set value; and the first electromagnetic valve is opened when receiving the first level signal and is closed when receiving the second level signal. The cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of chemical additive technology, and more specifically, to a dosing device. Background Technology

[0002] Odor control is an important environmental protection device for tobacco processing enterprises. It treats the odorous gases emitted during tobacco processing, such as those from moisture and dust removal, to ensure they meet emission standards. Since the gases from moisture and dust emissions are characterized by high temperature and humidity, they require pretreatment before entering the low-temperature plasma treatment chamber. This pretreatment involves cooling and dust removal via spraying. To prevent algae growth in the spray water during circulation, sodium hydroxide is added to the circulating water tank to maintain the pH value between 6 and 9.

[0003] like Figure 1 The diagram shows a schematic of the existing dosing device. The existing technology uses an electromagnetic diaphragm metering pump 5 to input sodium hydroxide solution into the spray tank 1 through the dosing pipe 12. At the same time, a stirring pump 6 needs to be installed on the dosing tank to dilute the flake sodium hydroxide. When the pH meter electrode measures the pH value of the liquid in the spray tank 1, the pH controller 5 controls the start and stop of the electromagnetic diaphragm metering pump 5 based on the detected pH value.

[0004] Because the solution is highly alkaline, the electromagnetic diaphragm metering pump 5 and the dosing pipe 12 are prone to crystallization and blockage. Furthermore, the dosing pipe is susceptible to aging and embrittlement under the influence of strong alkali, leading to leakage of the alkaline solution. This poses a safety hazard, as maintenance personnel are easily exposed to the alkaline solution (pH 12-13) and may sustain injuries. Additionally, the diaphragm metering pump and the mixing pump are expensive, resulting in high operating and maintenance costs. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a drug dosing device that can improve the problem of high cost in the prior art.

[0006] To achieve the above technical objectives, the technical solution adopted in this application is as follows:

[0007] This application provides a dosing device, including a dosing tank and a spray water tank, and further includes:

[0008] The dosing pipe is connected at both ends to the dosing tank and the spray water tank, respectively, so that the liquid in the dosing tank flows to the spray water tank through the dosing pipe;

[0009] A pH testing device is used to measure the pH value of the liquid in the spray tank;

[0010] A first solenoid valve is installed between the dosing tank and the water source. When the first solenoid valve is open, the water source is connected to the dosing tank. When the first solenoid valve is closed, the water source is not connected to the dosing tank.

[0011] The pH testing mechanism is electrically connected to the first solenoid valve;

[0012] The pH testing mechanism is also used to send a first level signal to the first solenoid valve when the pH value is less than the set value, and to send a second level signal to the first solenoid valve when the pH value is greater than or equal to the set value.

[0013] The first solenoid valve is used to open when it receives the first level signal and close when it receives the second level signal.

[0014] Furthermore, the dosing tank is located above the spray water tank, and the dosing pipe is connected to the body of the dosing tank.

[0015] Furthermore, it also includes:

[0016] The first water pipe has one end connected to a water source and the other end located inside the dosing tank, below the position where the dosing pipe connects to the dosing tank.

[0017] Furthermore, the first solenoid valve is installed on the first water pipe.

[0018] Furthermore, the dosing tube is an unplasticized polyvinyl chloride tube.

[0019] Furthermore, it also includes:

[0020] The spray pipe is connected to the outlet of the spray water tank;

[0021] A spray pump is installed on the spray pipe;

[0022] The pH testing mechanism includes a pH controller and a pH meter electrode, which are electrically connected. The pH meter electrode is disposed between the spray pump and the water outlet. The pH controller is electrically connected to a first solenoid valve and is used to acquire the pH value measured by the pH meter electrode. When the pH value is less than a set value, a first level signal is sent to the first solenoid valve. When the pH value is greater than or equal to the set value, a second level signal is sent to the first solenoid valve.

[0023] Furthermore, it also includes:

[0024] The second water pipe is connected at both ends to the spray tank and the water source, respectively.

[0025] The second solenoid valve is installed on the second water pipe.

[0026] Furthermore, a filter is provided on the spray pipe, and the filter is located between the pH meter electrode and the spray pump.

[0027] Furthermore, the spray pipe is U-shaped.

[0028] Furthermore, the spray pipe is also equipped with several nozzles, all of which are positioned above the pH meter electrode and the spray pump.

[0029] The invention employing the above technical solution has the following advantages:

[0030] In the technical solution provided in this application, a first solenoid valve is installed on the dosing pipe. When the pH value of the liquid in the spray tank is lower than a set value, the first solenoid valve opens, allowing the liquid from the water source to enter the dosing tank and mix with the chemicals in the dosing tank. This allows the alkaline solution to enter the spray tank, raising the pH value of the liquid in the spray tank. When the pH value is greater than or equal to the set value, the first solenoid valve closes, preventing the liquid from the dosing tank from flowing into the spray tank. This allows the dosing amount to be controlled by the first solenoid valve, reducing costs compared to existing technologies. Furthermore, the absence of highly alkaline solutions flowing through the first solenoid valve extends its service life, reduces its failure rate, and further lowers costs. Attached Figure Description

[0031] This application can be further illustrated by the non-limiting embodiments given in the accompanying drawings. It should be understood that the following drawings only illustrate some embodiments of this application and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained from these drawings without any inventive effort.

[0032] Figure 1 This is a schematic diagram of the existing technology.

[0033] Figure 2 This is a schematic diagram of the dosing device provided in an embodiment of this application.

[0034] Icons: 1-Spray water tank; 2-Dosing tank; 3-First water pipe; 4-Second water pipe; 5-Electromagnetic diaphragm metering pump; 6-Agitator pump; 7-pH controller; 8-pH meter electrode; 9-First solenoid valve; 10-Second solenoid valve; 11-Spray pump; 12-Dosing pipe; 13-Dosing pipe; 14-Filter; 15-Nozzle; 16-Plastic garland packing; 17-Spray pipe. Detailed Implementation

[0035] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that similar or identical parts are referred to by the same reference numerals in the drawings or description. Implementations not shown or described in the drawings are forms known to those skilled in the art. In the description of this application, terms such as "first" and "second" are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] This embodiment proposes a dosing device, such as... Figure 2 As shown, it includes a dosing tube 13, a pH testing mechanism, and a first solenoid valve 9.

[0037] The two ends of the dosing pipe 13 are connected to the dosing tank 2 and the spray water tank 1, respectively, so that the liquid in the dosing tank 2 flows to the spray water tank 1 through the dosing pipe 13.

[0038] The first solenoid valve 9 is located between the dosing tank 2 and the water source (not shown in the figure). When the first solenoid valve 9 is open, the water source is connected to the dosing tank 2, and the liquid in the water source can flow into the dosing tank 2. When the first solenoid valve 9 is closed, the water source is not connected to the dosing tank 2, and the liquid in the water source cannot flow into the dosing tank 2.

[0039] The pH testing mechanism is used to measure the pH value of the liquid in the spray tank 1. The pH testing mechanism is electrically connected to the first solenoid valve 9. The pH testing mechanism is also used to send a first-level signal to the first solenoid valve 9 when the pH value is less than a set value, and to send a second-level signal to the first solenoid valve 9 when the pH value is greater than or equal to the set value.

[0040] The first solenoid valve 9 is used to open when it receives a first level signal and close when it receives a second level signal.

[0041] In this embodiment, when the pH value of the liquid in the spray tank 1 is lower than the set value, an alkaline liquid needs to be pumped into the spray tank 1 to raise the pH value of the liquid in the spray tank 1 to reach the set value. Therefore, flake sodium hydroxide solid is placed in the dosing tank 2 in advance. When the pH value of the liquid in the spray tank 1 is lower than the set value, the pH value testing mechanism controls the first solenoid valve 9 to open. At this time, water from the water source flows into the dosing tank 2, and the alkaline fluid in the dosing tank 2 can flow into the spray tank 1 through the dosing pipe 13. When the pH value of the liquid in the spray tank 1 reaches the set value, the pH value testing mechanism controls the first solenoid valve 9 to close, and water from the water source cannot flow into the dosing tank 2.

[0042] In this embodiment, the dosing tank 2 is located above the spray tank 1, and the dosing pipe 13 is connected to the tank body of the dosing tank 2. When the liquid level in the dosing tank 2 reaches the height of the connection between the dosing pipe 13 and the dosing tank 2, the liquid in the dosing tank 2 flows into the spray tank 1 under the influence of gravity. When the liquid level in the dosing tank 2 is below the connection between the dosing pipe 13 and the dosing tank 2, the liquid in the dosing tank 2 does not flow into the spray tank 1.

[0043] This embodiment also includes a first water pipe 3, and a first solenoid valve 9 is installed on the first water pipe 3. One end of the first water pipe 3 is connected to the water source, and the other end is located inside the dosing tank 2 and below the position where the dosing pipe 13 is connected to the dosing tank 2, so as to prevent the liquid flowing into the dosing tank 2 from flowing out directly from the dosing pipe 13.

[0044] In this embodiment, the dosing tube 13 is an unplasticized PVC pipe. Unplasticized PVC pipe is a type of plastic pipe with PVC as its main component. It possesses excellent corrosion resistance, resisting the erosion of various chemicals, including acids, alkalis, and salt solutions. This makes unplasticized PVC pipe widely used in industries such as chemical processing and wastewater treatment.

[0045] In this embodiment, the dosing pipe 13 is set as an unplasticized polyvinyl chloride pipe, which improves corrosion resistance and avoids workers coming into contact with alkaline liquids through the dosing pipe 13.

[0046] In this embodiment, a spray pipe 17 is provided, which is connected to the outlet of the spray water tank 1. The spray pipe 17 has a U-shaped structure, with one end connected to the spray water tank 1. Several nozzles 15 are provided on the spray pipe 17. A pH meter electrode 8, a filter 14, and a spray pump 11 are provided between the nozzles 15 and the outlet of the spray water tank 1. The spray pump 11 is used to draw liquid from the spray water tank 1 and then spray it from the nozzles 15 onto the plastic flower ring packing 16.

[0047] In this embodiment, the pH value testing mechanism includes a pH controller 7 and a pH meter electrode 8. The pH controller 7 and the pH meter electrode 8 are electrically connected. The pH meter electrode 8 is disposed between the spray pump 11 and the outlet of the spray water tank 1. When the spray pump 11 draws out the liquid from the spray water tank 1 and passes through the pH meter electrode 8, the pH meter electrode 8 can measure the pH value of the liquid in the spray water tank 1.

[0048] The pH controller 7 is electrically connected to the first solenoid valve 9 and is used to obtain the pH value measured by the pH meter electrode 8. When the pH value is less than the set value, it sends a first level signal to the first solenoid valve 9, and when the pH value is greater than or equal to the set value, it sends a second level signal to the first solenoid valve 9.

[0049] In this embodiment, the first level signal and the second level signal can be a low level signal and a high level signal, or a high level signal and a low level signal, respectively.

[0050] This embodiment also includes a second water pipe 4 and a second solenoid valve 10. The two ends of the second water pipe 4 are connected to the spray tank 1 and the water source, respectively. The second solenoid valve 10 is installed on the second water pipe 4. When the second solenoid valve 10 is opened, the water source is connected to the spray tank 1, and the water in the water source flows into the spray tank 1 through the second water pipe 4. When the second solenoid valve is closed, the water source is not connected to the spray tank 1, and the water in the water source cannot flow into the spray tank 1 through the second water pipe 4.

[0051] Compared to the prior art, the dosing mechanism proposed in this embodiment eliminates the stirring pump 6 and the electromagnetic diaphragm metering pump 5, reducing costs. The dosing tank 2, originally installed at the same level as the bottom of the spray tank 1, has been moved to the top of the spray tank 1, saving overall floor space. The end of the first water pipe 3 that enters the dosing tank 2 is located below the end of the dosing pipe 13 that connects to the dosing tank 2, allowing the liquid in the dosing tank 2 to flow to the spray tank 1 under gravity, eliminating the need for solenoid valves and other valve bodies, further reducing costs. At the same time, since the dosing pipe 13 is not connected to solenoid valves or other valve bodies, there is no need to adapt the inner diameter of the solenoid valve channel, thus increasing the pipe diameter of the dosing pipe 13 and reducing the probability of blockage.

[0052] The original pH controller output signal was changed to control the diaphragm pump and then to control the water replenishment solenoid valve of the water tank. At the same time, the first water pipe 3 was narrowed to allow the medicine to be added slowly, so that the pH meter could detect the solution more accurately.

[0053] The working process of this embodiment is as follows: First, the solid sodium hydroxide flakes are added to the dosing tank 2 and the lid is closed. When the pH meter electrode 8 detects that the pH value of the spray water in the spray tank 1 is lower than the set value, the pH controller 7 sends a signal to open the first solenoid valve 9, injecting tap water into the bottom of the dosing tank 3. The tap water dissolves the sodium hydroxide flakes in the tank, forming a sodium hydroxide solution. When the liquid level is higher than the position of the dosing pipe 13, the sodium hydroxide solution overflows through the dosing pipe 13 and is added to the spray tank 1 by gravity, increasing the pH value of the water in the spray tank. When the pH value of the spray water reaches the upper limit of the set value, the pH controller 7 sends a signal to close the first solenoid valve 9, and the dosing tank 3 stops receiving water and no more chemicals are added to the spray tank.

[0054] Compared with the prior art, this embodiment reduces the need for a stirring device and a dosing diaphragm pump, and the high-concentration alkaline solution only comes into contact with the dosing tank 3 and the dosing pipe 13. In this embodiment, the dosing amount is controlled by controlling the first solenoid valve 9 entering the dosing tank. The liquid inside the first solenoid valve 9 is tap water, thus greatly reducing the possibility of corrosion damage. Therefore, its structure is simpler and the failure rate is extremely low.

[0055] In this embodiment, the stirring device and the dosing diaphragm pump of the original system have been eliminated, and the latex pipe of the original dosing device has been replaced with a UPVC pipe, avoiding the risk of aging, embrittlement and damage. In terms of controlling the water volume, only one solenoid valve (first solenoid valve 9) is installed, thus reducing its operating energy consumption and greatly reducing its operational safety risks.

[0056] This embodiment simplifies the structure of the dosing device, thereby significantly reducing equipment downtime and effectively mitigating safety risks associated with maintenance, thus minimizing personnel injuries. It also reduces equipment operating and maintenance costs, improves the operational capabilities of environmental protection equipment, and enhances the company's environmental protection capabilities.

[0057] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A dosing device, comprising a dosing tank and a spray water tank, characterized in that: Also includes: The dosing pipe is connected at both ends to the dosing tank and the spray water tank, respectively, so that the liquid in the dosing tank flows to the spray water tank through the dosing pipe; A pH testing device is used to measure the pH value of the liquid in the spray tank; A first solenoid valve is installed between the dosing tank and the water source. When the first solenoid valve is open, the water source is connected to the dosing tank. When the first solenoid valve is closed, the water source is not connected to the dosing tank. The pH testing mechanism is electrically connected to the first solenoid valve; The pH testing mechanism is also used to send a first level signal to the first solenoid valve when the pH value is less than the set value, and to send a second level signal to the first solenoid valve when the pH value is greater than or equal to the set value. The first solenoid valve is used to open when it receives the first level signal and close when it receives the second level signal.

2. The dosing device according to claim 1, characterized in that: The dosing tank is located above the spray water tank, and the dosing pipe is connected to the body of the dosing tank.

3. The dosing device according to claim 2, characterized in that: Also includes: The first water pipe has one end connected to a water source and the other end located inside the dosing tank, below the position where the dosing pipe connects to the dosing tank.

4. The dosing device according to claim 3, characterized in that: The first solenoid valve is installed on the first water pipe.

5. The dosing device according to any one of claims 1-4, characterized in that: The dosing tube is an unplasticized polyvinyl chloride tube.

6. The dosing device according to claim 1, characterized in that: Also includes: The spray pipe is connected to the outlet of the spray water tank; A spray pump is installed on the spray pipe; The pH testing mechanism includes a pH controller and a pH meter electrode, which are electrically connected. The pH meter electrode is disposed between the spray pump and the water outlet. The pH controller is electrically connected to a first solenoid valve and is used to acquire the pH value measured by the pH meter electrode. When the pH value is less than a set value, a first level signal is sent to the first solenoid valve. When the pH value is greater than or equal to the set value, a second level signal is sent to the first solenoid valve.

7. The dosing device according to claim 1, characterized in that: The dosing device also includes: The second water pipe is connected at both ends to the spray tank and the water source, respectively. The second solenoid valve is installed on the second water pipe.

8. The dosing device according to claim 6, characterized in that: A filter is installed on the spray pipe, and the filter is located between the pH meter electrode and the spray pump.

9. The dosing device according to claim 8, characterized in that: The spray pipe has a U-shaped structure.

10. The dosing device according to claim 9, characterized in that: The spray pipe is also equipped with several nozzles, all of which are positioned above the pH meter electrode and the spray pump.

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