Multi-material accurate conveying system with multi-stage pumps connected in series

Abstract

The utility model discloses a multi-material accurate conveying system with multi-stage pumps connected in series, which belongs to the technical field of material flow control and comprises at least two material feeding pipelines connected with a stirring reaction kettle. A corresponding material storage tank is arranged on each material feeding pipeline, and a metering pump and a pressure isolation pump are sequentially arranged on the material pipeline between the material storage tank and the stirring reaction kettle; a first pressure transmitter is arranged on the material pipeline between the metering pump and the pressure isolation pump and is used for detecting the pipeline pressure between the metering pump and the pressure isolation pump; the metering pump, the pressure isolation pump and the first pressure transmitter are electrically connected with the electrical control device; the electrical control device is used for controlling the rotating speed of a motor of the pressure isolation pump, so that the pipeline pressure at the outlet end of the metering pump is stable. According to the utility model, accurate conveying of multiple materials can be realized according to a set proportion, and the accuracy and the stability of material conveying are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of material flow control, and in particular relates to a multi-material precision conveying system with multi-stage pumps connected in series. Background Art

[0002] In automated multi-material mixing reactions, metering pumps are required to deliver the components to a stirred back-pressure reactor at a constant flow rate according to their respective proportions. When using a metering pump, assuming the material viscosity and rotational speed remain constant, changes in pressure will affect the volumetric efficiency of the metering pump, thereby directly affecting the output flow rate.

[0003] Existing metering pumps, when conveying multi-component materials, experience varying input and output pressures due to varying component flow rates and pipe diameters, leading to significant fluctuations in material delivery errors. Furthermore, chemical reactions occur during the mixing of multiple materials and gases in a stirred tank, altering their properties and causing temperature and pressure fluctuations, which in turn cause pressure fluctuations at the metering pump's outlet. This fluctuation in outlet pressure affects the metering pump's volumetric efficiency at the same speed, thus impacting the metering pump's output flow rate during continuous mixing reactions in the stirred tank. Utility Model Content

[0004] In response to one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a multi-material precision conveying system with multi-stage pumps connected in series, which can achieve precise conveying of multiple materials according to the set ratio, thereby improving the accuracy and stability of material conveying.

[0005] To achieve the above-mentioned object, the present invention provides a multi-material precision conveying system with multi-stage pumps connected in series, comprising at least two material feed pipelines connected to a stirred reactor;

[0006] Each material feed pipeline is provided with a corresponding material storage tank, and a metering pump and a pressure isolation pump are sequentially provided on the material pipeline between the material storage tank and the stirred reactor; a first pressure transmitter is provided on the material pipeline between the metering pump and the pressure isolation pump for detecting the pipeline pressure between the two;

[0007] The metering pump, the pressure isolation pump, and the first pressure transmitter are all electrically connected to the electrical control device; the electrical control device is used to control the motor speed of the pressure isolation pump, thereby stabilizing the pipeline pressure at the outlet end of the metering pump.

[0008] As a further improvement of the present invention, a delivery pump is further provided on the material pipeline between the material storage tank and the metering pump, and a second pressure transmitter is provided on the material pipeline between the delivery pump and the metering pump for detecting the pipeline pressure between the two;

[0009] The delivery pump and the second pressure transmitter are both electrically connected to an electrical control device, and the electrical control device is used to control the motor speed of the delivery pump, thereby stabilizing the pipeline pressure at the inlet end of the metering pump.

[0010] As a further improvement of the present invention, the metering pump operates at a constant speed; or,

[0011] A flow meter is provided on the material pipeline between the metering pump and the pressure isolation pump. The flow meter is electrically connected to the electrical control device, and the electrical control device is used to control the motor speed of the metering pump.

[0012] As a further improvement of the present invention, a filtering device is further provided on the material pipeline between the delivery pump and the metering pump.

[0013] As a further improvement of the present invention, a first ball valve is provided on the material pipeline between the material storage tank and the delivery pump.

[0014] As a further improvement of the present invention, a second ball valve is provided on the material pipeline between the pressure isolation pump and the stirred reactor, and a branch pipe is provided between the pressure isolation pump and the second ball valve, and a third ball valve is provided on the branch pipe.

[0015] As a further improvement of the present invention, a stirring shaft is provided inside the material storage tank, and / or the tank wall of the material storage tank is a jacket structure.

[0016] As a further improvement of the present invention, the delivery pump, metering pump, and pressure isolation pump are all gear metering pumps, screw pumps, or peristaltic pumps; and / or,

[0017] The flow meter is a mass flow meter, an ultrasonic flow meter or an electromagnetic flow meter; and / or,

[0018] The electrical control device adopts a PLC controller or a PID controller.

[0019] As a further improvement of the present invention, multiple pressure isolation pumps are arranged between the metering pump and the stirred reactor, and corresponding pressure transmitters are provided between two adjacent pressure isolation pumps. The pressure isolation pumps and pressure transmitters are both connected to the electrical control device.

[0020] As a further improvement of the present invention, the material is a liquid or a solid-liquid mixture.

[0021] In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:

[0022] (1) The multi-stage pump series-connected multi-material precision conveying system of the present invention can be used in parallel for multi-channel materials, and the materials are conveyed to the stirred reactor through the corresponding material feed pipeline. The first pressure transmitter is connected to the electrical control device to adjust the motor speed of the pressure isolation pump to achieve stable pipeline pressure at the outlet of the metering pump. Therefore, the flow rate change of the metering pump will not be disturbed by the pressure change generated when conveying multi-component materials, thereby achieving precise conveying of multiple materials according to the set ratio, thereby improving the accuracy and stability of material conveying.

[0023] (2) The multi-material precision conveying system of the present invention, which is connected in series with a multi-stage pump, stabilizes the pipeline pressure at the outlet of the metering pump by controlling the first pressure transmitter. At the same time, a delivery pump is provided on the material pipeline between the material storage tank and the metering pump, and a second pressure transmitter is provided on the material pipeline between the delivery pump and the metering pump. The second pressure transmitter is connected to an electrical control device to adjust the motor speed of the delivery pump, thereby achieving stable pipeline pressure at the inlet of the metering pump. The system is suitable for materials with high viscosity and poor fluidity.

[0024] (3) The multi-material precision conveying system of the present invention with multi-stage pumps in series overcomes the problem of large fluctuations in material conveying errors caused by different flow rates and pipe diameters of the components when conveying multi-component materials, resulting in different input and output pressures.

[0025] (4) The utility model provides a multi-material precision conveying system with multi-stage pumps in series. The metering pump operates at a constant speed or is controlled by a flow meter to operate at a set flow rate. When the pressure of the pipelines before and after the metering pump is stable, the flow rate of the metering pump can be further ensured to be stable.

[0026] (5) The multi-material precision conveying system with multi-stage pumps connected in series in the utility model can set multiple pressure isolation pumps between the metering pump and the stirred reactor, and corresponding pressure transmitters are provided between two adjacent pressure isolation pumps. The pressure transmitters are all connected to the electrical control device to control the motor speed of the corresponding pressure isolation pump respectively, so that the pressure of the material pipeline between the metering pump and the stirred reactor can be controlled in stages. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural schematic diagram of a multi-material precision conveying system with multi-stage pumps connected in series according to an embodiment of the utility model.

[0028] In all the drawings, the same figure marks represent the same technical features, specifically: 1. Material storage tank; 2. First ball valve; 3. Material pipeline; 4. Filter device; 5. Metering pump; 6. Flow meter; 7. First pressure transmitter; 8. Pressure isolation pump; 9. Transfer pump; 10. Second pressure transmitter; 11. Stirred reactor; 12. Discharge port; 13. Electrical control device; 14. Second ball valve; 15. Third ball valve; 16. Second material feed pipeline, 17. Nth material feed pipeline. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0032] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0033] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0034] like Figure 1 As shown, in one embodiment of the present invention, a multi-material precision conveying system with a multi-stage pump in series includes at least two material feed pipelines connected to a stirred reactor 11, which are used to input at least two materials into the stirred reactor 11 from the corresponding material feed pipelines according to a set ratio. The material can be a liquid or a solid-liquid mixture, and the multi-component material is output through the discharge port 12 after being stirred and reacted in the stirred reactor 11. Each material feed pipeline is provided with a corresponding material storage tank 1, and a metering pump 5 and a pressure isolation pump 8 are sequentially provided on the material pipeline 3 between the material storage tank 1 and the stirred reactor 11. A first pressure transmitter 7 is provided between the metering pump 5 and the pressure isolation pump 8 for detecting the pipeline pressure between the two.

[0035] The metering pump 5, the pressure isolation pump 8, and the first pressure transmitter 7 are all electrically connected to an electrical control device 13. The electrical control device 13 is used to control the motor speed of the pressure isolation pump 8 based on the pressure value fed back by the first pressure transmitter 7, thereby stabilizing the pipeline pressure at the outlet of the metering pump 5. This ensures that the flow rate of the metering pump 5 is not affected by pressure changes generated during the transportation of multi-component materials, preventing pressure changes from interfering with the accuracy of the metering pump 5, thereby achieving precise transportation of multiple materials according to the set ratio.

[0036] In the above embodiment, for materials with lower viscosity, only the metering pump 5 and the pressure isolation pump 8 are provided, and a first pressure transmitter 7 is provided between the two to stabilize the outlet pressure of the metering pump 5. However, for materials with higher viscosity, which have poor fluidity, the metering pump 5 not only needs to perform a metering function, but also needs to provide power to suck the materials with higher viscosity into the pump, which will affect the stability of the metering pump 5. Therefore, in another embodiment of the present invention, a delivery pump 9 is further provided on the material pipeline between the material storage tank 1 and the metering pump 5, and a second pressure transmitter 10 is provided on the material pipeline between the delivery pump 9 and the metering pump 5. The delivery pump 9 provides power for pumping in the material, and the second pressure transmitter 10 is connected to the electrical control device 13 to adjust the motor speed of the delivery pump 9, thereby stabilizing the inlet pressure of the metering pump 5.

[0037] That is, in this embodiment, if Figure 1 As shown, each material feed pipeline is provided with a corresponding material storage tank 1, and a delivery pump 9, a metering pump 5, and a pressure isolation pump 8 are sequentially provided on the material pipeline 3 between the material storage tank 1 and the stirred reactor 11. A first pressure transmitter 7 is provided between the metering pump 5 and the pressure isolation pump 8 for detecting the pipeline pressure between the two; a second pressure transmitter 10 is provided between the delivery pump 9 and the metering pump 5 for detecting the pipeline pressure between the two. The delivery pump 9, the metering pump 5, the pressure isolation pump 8, the first pressure transmitter 7, and the second pressure transmitter 10 are all electrically connected to an electrical control device 13, which is used to control the motor speed of the pressure isolation pump 8 according to the pressure value fed back by the first pressure transmitter 7, and at the same time control the motor speed of the delivery pump 9 according to the pressure value fed back by the second pressure transmitter 10.

[0038] In this embodiment, the delivery pump 9 delivers the material output from the material storage tank 1 to the inlet of the metering pump 5 through the second pressure transmitter 10. Since the delivery pump 9 and the second pressure transmitter 10 in this embodiment are both connected to the electrical control device 13, the signal from the second pressure transmitter 10 is connected to the electrical control device 13. The electrical control device 13 can receive the pressure value fed back by the second pressure transmitter 10 and compare it with the set pressure value. Based on the pressure value, the motor speed of the delivery pump 9 is adjusted, thereby stabilizing the pipeline pressure at the inlet of the metering pump 5.

[0039] Furthermore, in this embodiment, the pressure isolation pump 8 can transport the material from the outlet of the metering pump 5 through the first pressure transmitter 7 to the inlet of the stirred reactor 11. Because the pressure isolation pump 8 and the first pressure transmitter 7 in this embodiment are both connected to the electrical control device 13, the signal from the first pressure transmitter 7 is connected to the electrical control device 13. The electrical control device 13 can receive the pressure value fed back by the first pressure transmitter 7 and compare it with the set pressure value. Based on the pressure value, the motor speed of the pressure isolation pump 8 is adjusted, thereby stabilizing the pressure at the outlet of the metering pump 5.

[0040] In the multi-material precision conveying system with multi-stage pumps connected in series in this embodiment, the pipeline pressure at the inlet end of the metering pump 5 is stably controlled by the conveying pump 9, and the pipeline pressure at the outlet end of the metering pump 5 is stably controlled by the pressure isolation pump 8, so that the flow change of the metering pump 5 will not be disturbed by the pressure change generated when conveying multi-component materials, preventing the pressure change from interfering with the accuracy of the metering pump 5, thereby realizing the precise conveying of multiple materials according to the set ratio.

[0041] It should be noted that, in this application, the signal transmission and data processing between the electrical control device 13 and the pressure transmitters (including the first pressure transmitter 7 and the second pressure transmitter 10), the delivery pump 9, and the pressure isolation pump 8 all utilize existing technologies, and this application does not involve algorithmic improvements. For example, those skilled in the art will appreciate that the data processing in this embodiment involves only a simple threshold comparison: if the measured pressure value is too high compared to the set pressure value, the motor speed is increased; if the measured pressure value is too low compared to the set pressure value, the motor speed is decreased.

[0042] Preferably, the metering pump 5 operates at a constant speed under the control of the electrical control device 13. Alternatively, a flow meter 6 is provided on the material pipeline between the metering pump 5 and the pressure isolation pump 8. The flow meter 6 is electrically connected to the electrical control device 13, and the signal from the flow meter 6 is input to the electrical control device 13 to adjust the motor speed of the metering pump 5 through the electrical control device 13, thereby controlling the metering pump 5 to operate at a set flow rate and ensuring a stable material flow rate output to the flow meter 6. Based on this design, if the pressure in the pipelines before and after the metering pump 5 is stable, the flow rate of the metering pump 5 can be further ensured to be stable.

[0043] Preferably, a filtering device 4 is further provided on the material pipeline between the delivery pump 9 and the metering pump 5 for filtering the material output from the material storage tank 1 to prevent impurities from affecting the accuracy of the metering pump 5 .

[0044] Preferably, a first ball valve 2 is provided on the material pipeline between the material storage tank 1 and the delivery pump 9, and the first ball valve 2 is used to control the opening and closing of the material storage tank 1 discharge. Preferably, a second ball valve 14 is provided on the material pipeline between the pressure isolation pump 8 and the stirred reactor 11, and a branch pipe is also provided between the pressure isolation pump 8 and the second ball valve 14, and a third ball valve 15 is provided on the branch pipe. By cooperating with the second ball valve 14 and the third ball valve 15, the delivery device can be calibrated before use. Specifically, since the weight or volume of the material output within the set flow rate and the set time is constant, the calibration can be achieved by closing the second ball valve 14 and opening the third ball valve 15, and measuring the weight or volume of the material output from the branch pipe at the set flow rate and the set time. After the calibration is completed, the third ball valve 15 is closed and the second ball valve 14 is opened to switch the pipeline and connect the material pipeline with the stirred reactor 11.

[0045] Preferably, the delivery pump 9, metering pump 5, and pressure isolation pump 8 are conventional gear metering pumps, screw pumps, or peristaltic pumps; the flowmeter 6 is a mass flowmeter, ultrasonic flowmeter, or electromagnetic flowmeter; and the electrical control device 13 is a PLC controller or a PID controller.

[0046] Preferably, the material storage tank 1 has stirring and jacketing functions, that is, a stirring shaft is provided inside the material storage tank 1 to ensure the uniformity of the material; the tank wall of the material storage tank 1 is a jacket structure to control the material temperature and avoid volume changes caused by temperature changes interfering with the flow control of the gear metering pump (positive displacement metering pump).

[0047] Figure 1 Only the structure of the first material feed pipeline is shown. For the second material feed pipeline 16 to the Nth material feed pipeline 17 connected in parallel with the first material feed pipeline on the stirred reactor 11, the above design can be referred to and will not be repeated here. The material feed pipelines run in parallel.

[0048] In addition, in this embodiment, a pressure isolation pump 8 is arranged between the metering pump 5 and the stirred reactor 11. In other embodiments, multiple pressure isolation pumps 8 can also be arranged between the metering pump 5 and the stirred reactor 11, and corresponding pressure transmitters are provided between two adjacent pressure isolation pumps 8. Each pressure isolation pump 8 and pressure transmitter is connected to the electrical control device 13, which respectively controls the motor speed of the corresponding pressure isolation pump 8, so that the material pipeline pressure between the metering pump 5 and the stirred reactor 11 can be graded and controlled.

[0049] A multi-material precision conveying system with multi-stage pumps connected in series in this embodiment was used to conduct a continuous liquid material metering and conveying test (in the test, the conveying pump 9, the metering pump 5, and the pressure isolation pump 8 all used conventional gear metering pumps, and the flowmeter 6 used an ultrasonic flowmeter). The results showed that the metering error of the material conveying of this system was ±0.2g / min, so the conveying system of this embodiment can achieve precise material conveying.

[0050] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A multi-material precision conveying system with multi-stage pumps in series, characterized in that: comprising at least two material feed pipelines connected to the stirred reactor (11); Each material feed pipeline is provided with a corresponding material storage tank (1), and a metering pump (5) and a pressure isolation pump (8) are sequentially provided on the material pipeline between the material storage tank (1) and the stirred reactor (11); a first pressure transmitter (7) is provided on the material pipeline between the metering pump (5) and the pressure isolation pump (8) for detecting the pipeline pressure between the two; The metering pump (5), the pressure isolation pump (8), and the first pressure transmitter (7) are all electrically connected to an electrical control device (13); the electrical control device (13) is used to control the motor speed of the pressure isolation pump (8), thereby stabilizing the pipeline pressure at the outlet end of the metering pump (5).

2. The multi-material precision conveying system with multi-stage pumps connected in series according to claim 1 is characterized in that: A delivery pump (9) is further provided on the material pipeline between the material storage tank (1) and the metering pump (5), and a second pressure transmitter (10) is provided on the material pipeline between the delivery pump (9) and the metering pump (5) for detecting the pipeline pressure between the two; The delivery pump (9) and the second pressure transmitter (10) are both electrically connected to an electrical control device (13). The electrical control device (13) is used to control the motor speed of the delivery pump (9), thereby stabilizing the pipeline pressure at the inlet end of the metering pump (5).

3. The multi-material precision conveying system with multi-stage pumps connected in series according to claim 1 or 2, characterized in that: The metering pump (5) operates at a constant speed; or A flow meter (6) is provided on the material pipeline between the metering pump (5) and the pressure isolation pump (8). The flow meter (6) is electrically connected to the electrical control device (13), and the electrical control device (13) controls the motor speed of the metering pump (5).

4. The multi-material precision conveying system with multi-stage pumps connected in series according to claim 2, characterized in that: A filtering device (4) is also provided on the material pipeline between the delivery pump (9) and the metering pump (5).

5. The multi-material precision conveying system with multi-stage pumps connected in series according to claim 2 is characterized in that: A first ball valve (2) is provided on the material pipeline between the material storage tank (1) and the delivery pump (9).

6. The multi-material precision conveying system with multi-stage pumps connected in series according to claim 1 or 2, characterized in that: A second ball valve (14) is provided on the material pipeline between the pressure isolation pump (8) and the stirred reactor (11), and a branch pipe is provided between the pressure isolation pump (8) and the second ball valve (14), and a third ball valve (15) is provided on the branch pipe.

7. The multi-material precision conveying system with multi-stage pumps connected in series according to claim 1 or 2, characterized in that: A stirring shaft is provided inside the material storage tank (1), and / or the tank wall of the material storage tank (1) is a jacket structure.

8. The multi-material precision conveying system with multi-stage pumps connected in series according to claim 2, characterized in that: The delivery pump (9), metering pump (5), and pressure isolation pump (8) are all gear metering pumps, screw pumps, or peristaltic pumps; and / or, The flow meter (6) is a mass flow meter, an ultrasonic flow meter or an electromagnetic flow meter; and / or, The electrical control device (13) adopts a PLC controller or a PID controller.

9. The multi-material precision conveying system with multi-stage pumps connected in series according to claim 1 or 2, characterized in that: A plurality of pressure isolation pumps (8) are arranged between the metering pump (5) and the stirred reactor (11), and corresponding pressure transmitters are arranged between two adjacent pressure isolation pumps (8). The pressure isolation pumps (8) and the pressure transmitters are both connected to the electrical control device (13).

10. The multi-material precision conveying system with multi-stage pumps connected in series according to claim 1 or 2, characterized in that: The material is liquid or a solid-liquid mixture.

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