High-precision mixing and proportioning device for vehicle urea solution

Abstract

The utility model discloses a kind of high-precision mixing proportioning devices of vehicle urea solution, including urea dissolving tank, deionized water storage tank and static mixing proportioning tank, urea dissolving tank and static mixing proportioning tank are connected by first metering conveying mechanism between, deionized water storage tank and static mixing proportioning tank are connected by second metering conveying mechanism between, and dissolving stirring mechanism is provided in urea dissolving tank, spiral mixing proportioning mechanism is provided in static mixing proportioning tank, the utility model is equipped with first metering conveying mechanism, second metering conveying mechanism, dissolving stirring mechanism and spiral mixing proportioning mechanism, promote urea solution mixing proportioning effect, through multiple metering addition module, the proportioning of vehicle urea solution is effectively controlled, realize the proportioning precision of vehicle urea solution, and through spiral mixing pipe and spiral flow guide strip, realize the mixing uniformity of vehicle urea solution, improve vehicle urea solution proportioning concentration consistency.

Description

Technical Field

[0001] This utility model belongs to the technical field of automotive urea solution production equipment, specifically relating to a high-precision mixing and proportioning device for automotive urea solution. Background Technology

[0002] As a key reducing agent in diesel vehicle SCR systems, the concentration accuracy of automotive urea solution directly affects exhaust gas treatment efficiency. National standards require that the urea concentration be kept stable within the range of 32.5% ± 0.7%.

[0003] Existing mixing and proportioning devices have the following problems: First, they adopt a single flow control mode, which is easily affected by changes in the viscosity and temperature of raw materials, thus affecting the proportioning accuracy; second, the mixing unit has a simple structure, resulting in insufficient uniformity of urea and water mixing and large local concentration deviations. To address these issues, we propose a high-precision mixing and proportioning device for automotive urea solution. Utility Model Content

[0004] The purpose of this invention is to provide a high-precision mixing and proportioning device for automotive urea solution to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-precision mixing and proportioning device for automotive urea solution, comprising a urea dissolving tank, a deionized water storage tank, and a static mixing and proportioning tank, wherein the urea dissolving tank and the static mixing and proportioning tank are connected by a first metering and conveying mechanism, and the deionized water storage tank and the static mixing and proportioning tank are connected by a second metering and conveying mechanism; The urea dissolving tank is equipped with a dissolving and stirring mechanism for stirring and dissolving urea raw materials; The static mixing tank is equipped with a spiral mixing mechanism for mixing and proportioning automotive urea solution.

[0006] Preferably, the urea dissolving tank is provided with a urea raw material input pipe for conveying urea raw material into the urea dissolving tank.

[0007] Preferably, the dissolving and stirring mechanism includes a dissolving and stirring motor, a transmission roller, a stirring rod, and a scraper. The dissolving and stirring motor is mounted on the urea dissolving tank, and the transmission roller is connected to the output end of the dissolving and stirring motor and extends into the urea dissolving tank. The stirring rods are provided in a plurality of positions, and the plurality of stirring rods are distributed in a ring at equal intervals on the transmission roller. The scraper is provided between the outer ends of the vertically aligned stirring rods.

[0008] Preferably, the distance between the scraper and the inner wall of the urea dissolving tank is less than or equal to 5 mm.

[0009] Preferably, the first metering and conveying mechanism includes a first conveying pipe, a plunger metering pump, and an electromagnetic flow meter; The first delivery pipe is connected between the urea dissolving tank and the static mixing and proportioning tank, and the plunger metering pump and the electromagnetic flow meter are sequentially installed on the first delivery pipe.

[0010] Preferably, the second metering and conveying mechanism includes a second conveying pipe, a variable frequency gear pump, and a mass flow meter; The second delivery pipe is disposed between the deionized water storage tank and the static mixing and proportioning tank, and the variable frequency gear pump and the mass flow meter are sequentially disposed on the second delivery pipe.

[0011] Preferably, the deionized water storage tank is connected to a reverse osmosis water supply device via a deionized water input pipe, and the deionized water storage tank is equipped with a liquid level sensor.

[0012] Preferably, the spiral mixing and proportioning mechanism includes a mixing chamber shell and a spiral mixing tube; The mixing chamber shell is located inside the top of the static mixing and proportioning tank, and both the first conveying pipe and the second conveying pipe are connected to the mixing chamber shell, while the spiral mixing pipe is located at the bottom of the mixing chamber shell; The inner wall of the spiral mixing tube is provided with equally spaced spiral guide strips.

[0013] Preferably, the bottom of the static mixing and proportioning tank is provided with a vehicle urea solution discharge pipe, and a solenoid valve is provided on the vehicle urea solution discharge pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model are: In this invention, the urea dissolving tank and the static mixing and proportioning tank are connected by a first metering and conveying mechanism, and the deionized water storage tank and the static mixing and proportioning tank are connected by a second metering and conveying mechanism. The urea dissolving tank is equipped with a dissolving and stirring mechanism, and the static mixing and proportioning tank is equipped with a spiral mixing and proportioning mechanism to improve the mixing and proportioning effect of the urea solution. Through multiple metering and adding modules, the proportion of automotive urea solution is effectively controlled to achieve the accuracy of automotive urea solution proportioning. Furthermore, through the spiral mixing tube and spiral guide strip, the mixing uniformity of automotive urea solution is achieved, improving the consistency of automotive urea solution proportioning concentration. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model; Figure 2 This is a schematic diagram of the overall main structure of this utility model; Figure 3 This is a schematic diagram of the overall front view sectional structure of this utility model; Figure 4 This is a cross-sectional perspective view of the urea dissolving tank of this utility model. Figure 5 This is a schematic diagram of the cross-sectional structure of the spiral mixing tube of this utility model; Figure 6 This is a schematic diagram of the unfolded cross-sectional structure of the spiral mixing tube of this utility model.

[0016] In the diagram: 1. Urea dissolving tank; 2. Deionized water storage tank; 3. Static mixing and proportioning tank; 4. First metering and conveying mechanism; 401. First conveying pipe; 402. Plunger metering pump; 403. Electromagnetic flow meter; 5. Second metering and conveying mechanism; 501. Second conveying pipe; 502. Variable frequency gear pump; 503. Mass flow meter; 6. Dissolving and stirring mechanism; 601. Dissolving and stirring motor; 602. Transmission roller; 603. Stirring rod; 604. Scraper; 7. Spiral mixing and proportioning mechanism; 701. Mixing chamber shell; 702. Spiral mixing pipe; 703. Spiral guide strip; 8. Urea raw material input pipe; 9. Liquid level sensor; 10. Reverse osmosis water supply device; 11. Vehicle urea solution discharge pipe; 12. Solenoid valve. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figures 1-6 The high-precision mixing and proportioning device for automotive urea solution provided by this utility model includes a urea dissolving tank 1, a deionized water storage tank 2, and a static mixing and proportioning tank 3. The urea dissolving tank 1 is provided with a urea raw material input pipe 8 for conveying urea raw material into the urea dissolving tank 1. The urea dissolving tank 1 and the static mixing and proportioning tank 3 are connected by a first metering and conveying mechanism 4. The first metering and conveying mechanism 4 includes a first conveying pipe 401, a plunger metering pump 402, and an electromagnetic flowmeter 403. The first conveying pipe 401 is connected between the urea dissolving tank 1 and the static mixing and proportioning tank 3. The plunger metering pump 402 and the electromagnetic flowmeter 403 are sequentially arranged on the first conveying pipe 401. The deionized water storage tank 2 and the static mixing and proportioning tank 3 are connected by a second metering and conveying mechanism 5. The second metering and conveying mechanism 5 includes a second conveying pipe 501, a variable frequency gear pump 502, and a mass flow meter 503. The second conveying pipe 501 is set between the deionized water storage tank 2 and the static mixing and proportioning tank 3. The variable frequency gear pump 502 and the mass flow meter 503 are sequentially set on the second conveying pipe 501. The deionized water storage tank 2 is connected to a reverse osmosis water supply device 10 through a deionized water input pipe. The deionized water storage tank 2 is equipped with a liquid level sensor 9. A dissolving and stirring mechanism 6 is provided inside the urea dissolving tank 1 for stirring and dissolving urea raw materials. The dissolving and stirring mechanism 6 includes a dissolving and stirring motor 601, a transmission roller 602, a stirring rod 603, and a scraper 604. The dissolving and stirring motor 601 is mounted on the urea dissolving tank 1. The transmission roller 602 is connected to the output end of the dissolving and stirring motor 601 and extends into the urea dissolving tank 1. There are several stirring rods 603, which are distributed in a ring at equal intervals on the transmission roller 602. A scraper 604 is provided between the outer ends of the vertically aligned stirring rods 603. The distance between the scraper 604 and the inner wall of the urea dissolving tank 1 is less than or equal to 5 mm. A spiral mixing and proportioning mechanism 7 is provided inside the static mixing and proportioning tank 3 for mixing and proportioning automotive urea solution. The spiral mixing and proportioning mechanism 7 includes a mixing chamber shell 701 and a spiral mixing tube 702. The mixing chamber shell 701 is located at the top inside the static mixing and proportioning tank 3, and the first conveying pipe 401 and the second conveying pipe 501 are both connected to the mixing chamber shell 701. The spiral mixing tube 702 is located at the bottom of the mixing chamber shell 701. Spiral guide strips 703 are provided on the inner side wall of the spiral mixing tube 702 at equal intervals. The bottom of the static mixing and proportioning tank 3 is equipped with a vehicle urea solution discharge pipe 11, and a solenoid valve 12 is installed on the vehicle urea solution discharge pipe 11.

[0019] In this invention, the urea dissolving tank 1 and the static mixing and proportioning tank 3 are connected by a first metering and conveying mechanism 4, and the deionized water storage tank 2 and the static mixing and proportioning tank 3 are connected by a second metering and conveying mechanism 5. The urea dissolving tank 1 is equipped with a dissolving and stirring mechanism 6, and the static mixing and proportioning tank 3 is equipped with a spiral mixing and proportioning mechanism 7. In use, urea raw material is fed into the urea dissolving tank 1 through the urea raw material input pipe 8, and the dissolving and stirring mechanism 6 is activated, causing the dissolving and stirring motor 601 to drive the transmission roller 602, stirring rod 603, and scraper 604 to rotate. The stirring rod 603 dissolves the urea raw material in the urea dissolving tank 1, and the scraper 604 scrapes off the urea crystals on the inner wall of the urea dissolving tank 1. Then, deionized water is supplied to the deionized water storage tank 2 through the reverse osmosis water supply unit 10, and the level of deionized water in the deionized water storage tank 2 is detected by the level sensor 9. Then, according to the required concentration of automotive urea solution, control signals are sent to the first metering and conveying mechanism 4 and the second metering and conveying mechanism 5 through the PLC control terminal (PLC control is well known to those skilled in the art and is prior art, and is not described here). (Details omitted). At this time, the first metering and conveying mechanism 4 and the second metering and conveying mechanism 5 start simultaneously. The plunger metering pump 402 meteringly delivers urea solution to the mixing chamber shell 701 through the first conveying pipe 401, and the measurement is recorded by the electromagnetic flowmeter 403, which then feeds back to the PLC control terminal. The variable frequency gear pump 502 delivers deionized water to the mixing chamber shell 701 through the second conveying pipe 501, and the deionized water volume is fed back to the PLC control terminal by the mass flowmeter 503 and the liquid level sensor 9. Then, the urea solution and deionized water in the mixing chamber shell 701 are mixed. The urea solution and deionized water are mixed and proportioned, and then conveyed to the static mixing tank 3 through the spiral mixing pipe 702. The spiral guide strip 703 on the inner wall of the spiral mixing pipe 702 enables the urea solution and deionized water to form a swirling mixing ratio, improving the mixing ratio of the urea solution. Through multiple metering and adding modules, the ratio of the automotive urea solution is effectively controlled, achieving the mixing accuracy of the automotive urea solution. Furthermore, the spiral mixing pipe 702 and spiral guide strip 703 ensure the mixing uniformity of the automotive urea solution and improve the consistency of the automotive urea solution concentration.

[0020] In summary, the high-precision mixing and proportioning device for automotive urea solution provided in this embodiment is used as follows: During use, urea raw material is input into the urea dissolving tank 1 through the urea raw material input pipe 8, and the dissolving and stirring mechanism 6 is activated. This causes the dissolving and stirring motor 601 to drive the transmission roller 602, stirring rod 603, and scraper 604 to rotate. The stirring rod 603 dissolves the urea raw material in the urea dissolving tank 1, and the scraper 604 removes urea crystals from the inner wall of the urea dissolving tank 1. Deionized water is then supplied to the deionized water storage tank 2 through the reverse osmosis water supply device 10, and the level of deionized water in the deionized water storage tank 2 is detected by the level sensor 9. Then, according to the required concentration of the automotive urea solution, control signals are sent to the first metering and conveying mechanism 4 and the second metering and conveying mechanism 5 via the PLC control terminal (PLC control is well known to those skilled in the art). (This is existing technology and will not be described in detail here). At this time, the first metering and conveying mechanism 4 and the second metering and conveying mechanism 5 start simultaneously. The plunger metering pump 402 conveys urea solution to the mixing chamber shell 701 through the first conveying pipe 401, and the electromagnetic flowmeter 403 measures the solution and sends feedback to the PLC control terminal. The variable frequency gear pump 502 conveys deionized water to the mixing chamber shell 701 through the second conveying pipe 501, and the deionized water volume is fed back to the PLC control terminal through the mass flowmeter 503 and the liquid level sensor 9. Then, the urea solution and deionized water in the mixing chamber shell 701 are mixed and proportioned, and conveyed to the static mixing proportioning tank 3 through the spiral mixing pipe 702. The spiral guide strip 703 on the inner wall of the spiral mixing pipe 702 can make the urea solution and deionized water form a swirling mixing proportion, improving the mixing proportion of urea solution.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-precision mixing and proportioning device for automotive urea solution, characterized in that, It includes a urea dissolving tank (1), a deionized water storage tank (2) and a static mixing and proportioning tank (3). The urea dissolving tank (1) and the static mixing and proportioning tank (3) are connected by a first metering and conveying mechanism (4), and the deionized water storage tank (2) and the static mixing and proportioning tank (3) are connected by a second metering and conveying mechanism (5). The urea dissolving tank (1) is equipped with a dissolving and stirring mechanism (6) for stirring and dissolving urea raw materials; The static mixing tank (3) is equipped with a spiral mixing mechanism (7) for mixing and proportioning automotive urea solution; The first metering and conveying mechanism (4) includes a first conveying pipe (401), a plunger metering pump (402), and an electromagnetic flowmeter (403). The first delivery pipe (401) is connected between the urea dissolving tank (1) and the static mixing and proportioning tank (3), and the plunger metering pump (402) and the electromagnetic flow meter (403) are sequentially arranged on the first delivery pipe (401); The second metering and conveying mechanism (5) includes a second conveying pipe (501), a variable frequency gear pump (502), and a mass flow meter (503). The second delivery pipe (501) is disposed between the deionized water storage tank (2) and the static mixing and proportioning tank (3), and the variable frequency gear pump (502) and the mass flow meter (503) are disposed sequentially on the second delivery pipe (501); The spiral mixing and proportioning mechanism (7) includes a mixing chamber shell (701) and a spiral mixing tube (702). The mixing chamber shell (701) is located inside the top of the static mixing and proportioning tank (3), and the first conveying pipe (401) and the second conveying pipe (501) are both connected to the mixing chamber shell (701), and the spiral mixing pipe (702) is located at the bottom of the mixing chamber shell (701); The inner wall of the spiral mixing tube (702) is provided with equally spaced spiral guide strips (703).

2. The high-precision mixing and proportioning device for automotive urea solution according to claim 1, characterized in that: The urea dissolving tank (1) is provided with a urea raw material input pipe (8) for conveying urea raw material into the urea dissolving tank (1).

3. The high-precision mixing and proportioning device for automotive urea solution according to claim 1, characterized in that: The dissolving and stirring mechanism (6) includes a dissolving and stirring motor (601), a transmission roller (602), a stirring rod (603), and a scraper (604). The dissolving and stirring motor (601) is mounted on the urea dissolving tank (1), and the transmission roller (602) is connected to the output end of the dissolving and stirring motor (601) and extends into the urea dissolving tank (1). The stirring rod (603) is provided in a plurality of them. The plurality of stirring rods (603) are distributed in a ring at equal intervals on the transmission roller (602). The scraper (604) is provided between the outer ends of the stirring rods (603) that are aligned vertically.

4. The high-precision mixing and proportioning device for automotive urea solution according to claim 3, characterized in that: The distance between the scraper (604) and the inner wall of the urea dissolving tank (1) is less than or equal to 5 mm.

5. The high-precision mixing and proportioning device for automotive urea solution according to claim 1, characterized in that: The deionized water storage tank (2) is connected to a reverse osmosis water supply device (10) via a deionized water input pipe, and a liquid level sensor (9) is installed on the deionized water storage tank (2).

6. The high-precision mixing and proportioning device for automotive urea solution according to claim 1, characterized in that: The bottom of the static mixing tank (3) is provided with a vehicle urea solution discharge pipe (11), and a solenoid valve (12) is provided on the vehicle urea solution discharge pipe (11).

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