A differential pressure detection and automatic air supply dense phase conveying system

Abstract

The present invention discloses a differential pressure detection automatic air-supply dense phase conveying system, which belongs to the technical field of pneumatic conveying of materials. It includes a dense phase conveying pipeline, an air-supply port is provided on the dense phase conveying pipeline, and an upstream air pressure collection port and a downstream air pressure collection port are respectively provided on the dense phase conveying pipeline and located upstream and downstream of the air-supply port. The upstream air pressure collection port, the air-supply port and the downstream air pressure collection port constitute a detection air-supply port group, and the detection air-supply port group is connected to a detection air-supply unit, and the detection air-supply unit includes an air-supply pipe, a pressure differential air-supply valve, an upstream pressure-guiding pipe and a downstream pressure-guiding pipe. The pressure differential air-supply valve controls the air-supply switch of the air-supply pipe according to the pressure differential information, thereby realizing automatic air-supply of the pipeline section between the upstream and downstream of the dense phase conveying pipeline, which can effectively prevent pipe blockage, increase the transmission distance, reduce the conveying gas pressure and gas volume, reduce the terminal wind speed, thereby reducing the raw material breakage rate, and saving air and energy.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic conveying of materials, in particular to a differential pressure detection and automatic air supply dense phase conveying system. Background Art

[0002] In modern production, raw materials and intermediates are often present in the form of powders and granules. For ease of transportation and cost savings, they are often also transported in bulk. The most common method for transporting bulk materials from one location to another is pneumatic conveying, which is categorized into dilute phase conveying and dense phase conveying. Dense phase conveying is widely used in automated industrial production due to its wide range of applications, low energy consumption, minimal product breakage, and reduced pipe wear.

[0003] Dense-phase conveying utilizes high pressure and low gas velocity. The gas velocity is generally lower than the particle suspension velocity, so the particles do not remain suspended in the gas. Instead, they accumulate at the bottom of the pipeline and are transported through the pipeline in dense-phase flow modes such as slug flow, stratified flow, and moving bed flow. Due to the significant pressure drop during dense-phase conveying, gas is added at appropriate locations in the pipeline to compensate for the pressure head lost during the conveying process, thereby ensuring long-distance transport of solid particles and eliminating pipeline blockage.

[0004] Existing dense-phase air supply forms usually include continuous air supply and pulse air supply. The air supply method is to open several air supply ports on the conveying pipeline for air supply. Since the air supply valve has no detection function, the air supply is often blind, and sometimes even has a counter-effect on dense-phase conveying, which also increases the energy consumption of air supply. Summary of the Invention

[0005] The purpose of the present invention is to provide a differential pressure detection automatic air supply dense phase conveying system. This system can realize on-demand air supply through differential pressure detection, effectively prevent pipe blockage, increase transmission distance, reduce conveying gas pressure and gas volume, reduce terminal wind speed, thereby reducing raw material breakage rate and saving air and energy.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A differential pressure detection automatic air-supplementing dense phase conveying system comprises a dense phase conveying pipeline, an air-supplementing port is provided on the dense phase conveying pipeline, an upstream air pressure collection port and a downstream air pressure collection port are respectively provided on the dense phase conveying pipeline and located upstream and downstream of the air-supplementing port, the upstream air pressure collection port, the air-supplementing port and the downstream air pressure collection port constitute a detection air-supplementing port group, the detection air-supplementing port group is connected to a detection air-supplementing unit, the detection air-supplementing unit comprises an air-supplementing pipe, a pressure differential air-supplementing valve, an upstream pressure-guiding pipe and a downstream pressure-guiding pipe, one end of the air-supplementing pipe is connected to the air-supplementing port The pressure differential air supply valve is connected in series to the air supply pipe, and the upstream pressure measuring port and the downstream pressure measuring port on the pressure differential air supply valve are respectively connected to one end of the upstream pressure-guiding pipe and one end of the downstream pressure-guiding pipe, and the other end of the upstream pressure-guiding pipe and the other end of the downstream pressure-guiding pipe are respectively connected to the upstream air pressure collection port and the downstream air pressure collection port. The pressure differential air supply valve is used to detect the pressure difference between upstream and downstream in the dense phase conveying pipeline, and the air supply switch of the air supply pipe is controlled according to the pressure difference information, so as to realize automatic air supply to the pipeline section between the upstream and downstream of the dense phase conveying pipeline.

[0008] Furthermore, a plurality of detection and air supply port groups are distributed along the dense phase conveying pipeline, and one detection and air supply port group corresponds to one detection and air supply unit.

[0009] Furthermore, it also includes a raw material silo, a usage silo and a main air supply pipeline. The dense phase conveying pipeline conveys the raw materials in the raw material silo to the usage silo. The dense phase conveying pipeline is connected to the conveying gas source. The main air supply pipeline is arranged along the dense phase conveying pipeline. The main air supply pipeline is connected to the air supply source. The other end of the air supply pipe in all the detection air supply units is connected to the main air supply pipeline.

[0010] Furthermore, the pressure differential air supply valve includes a solenoid valve, a control module, an upstream pressure sensor and a downstream pressure sensor. The valve body of the solenoid valve is provided with an upstream pressure measuring chamber and a downstream pressure measuring chamber. The valve body of the solenoid valve is provided with an upstream pressure measuring port and a downstream pressure measuring port respectively connected to the upstream pressure measuring chamber and the downstream pressure measuring chamber. The upstream pressure sensor and the downstream pressure sensor are respectively arranged in the upstream pressure measuring chamber and the downstream pressure measuring chamber. The upstream pressure sensor and the downstream pressure sensor transmit the pressure information to the control module, and the control module controls the air supply switch of the solenoid valve according to the upstream and downstream pressure differential information.

[0011] Furthermore, a pressure-conducting medium is provided in the upstream pressure-guiding pipe and the downstream pressure-guiding pipe, and an elastic pressure-guiding diaphragm is provided at the pipe opening of the upstream pressure-guiding pipe and the downstream pressure-guiding pipe, and the elastic pressure-guiding diaphragm seals one end of the upstream pressure-guiding pipe and the downstream pressure-guiding pipe.

[0012] Furthermore, the pressure transmission medium is low-viscosity oil.

[0013] Furthermore, an electric control chamber is provided in the valve body of the solenoid valve, the control module is provided in the electric control chamber, and a control panel is provided on the valve body of the solenoid valve, and the control panel is electrically connected to the control module.

[0014] Furthermore, the control panel is provided with a pressure difference threshold adjustment knob, a hysteresis parameter adjustment knob and an air supply mode switching switch.

[0015] Furthermore, the upstream pressure sensor and the downstream pressure sensor are differential pressure sensors.

[0016] Furthermore, the low-viscosity oil includes but is not limited to silicone oil, mineral oil, synthetic oil, and vegetable oil.

[0017] The beneficial effects of the present invention are:

[0018] 1. It can realize on-demand gas replenishment through differential pressure detection, effectively prevent pipe blockage, increase transmission distance, reduce conveying gas pressure and gas volume, reduce terminal wind speed, thereby reducing raw material breakage rate and saving energy.

[0019] 2. The pressure difference of the conveying pipeline is detected by the elastic pressure-guiding diaphragm and the pressure-guiding pipe filled with medium. The material does not enter the pressure-guiding pipe, and there is no risk of blockage in the pressure-guiding pipe.

[0020] 3. The control module uses a control circuit board, which can adjust parameters such as operating mode, differential pressure threshold, and hysteresis. The control circuit board can be analog or digital. Analog control allows for easy parameter adjustment, stable operation, quick response, and a small size; digital control offers the advantage of intuitive adjustment.

[0021] 4. The delivery gas source and the air supply gas source are independent of each other and do not interfere with each other. The delivery gas source pressure will not fluctuate due to air supply.

[0022] 5. The valve body integrates the control circuit board, upstream pressure sensor, downstream pressure sensor, upstream pressure measuring cavity and downstream pressure measuring cavity, which has the characteristics of small size and easy installation.

[0023] 6. The air supply parameters of each pipeline section on the dense phase conveying pipeline are different. Multiple detection and air supply units are installed on the dense phase conveying pipeline of this system. They are independent of each other, which makes it easy to adjust the parameters separately to achieve the best conveying effect.

[0024] 7. Different from the traditional dense phase conveying system, this system does not need to blow out the pipe after stopping the conveying. When the conveying is resumed, the pipe will be automatically cleared, which is convenient for quantitative conveying control. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described with reference to the accompanying drawings. However, the embodiments in the accompanying drawings do not limit the present invention in any way. A person skilled in the art can derive other drawings based on the following drawings without inventive effort.

[0026] Figure 1 A schematic structural diagram of the present invention

[0027] Figure 2 for Figure 1 The structural diagram of the detection and air supply unit is shown;

[0028] Figure 3 for Figure 2 The structural diagram of the pressure differential air supply valve is shown;

[0029] Figure 4 for Figure 3 The cross-sectional view along line AA is shown;

[0030] Figure 5 for Figure 4 The control module shown is an electrical schematic diagram of the analog circuit control;

[0031] Figure 6 Schematic diagram of conveying state 1 during dense phase conveying;

[0032] Figure 7 Schematic diagram of conveying state 2 during dense phase conveying;

[0033] Figure 8 Schematic diagram of conveying state 3 during dense phase conveying.

[0034] In the figure: 1. Solenoid valve; 2. Control module; 3. Upstream pressure sensor; 4. Downstream pressure sensor; 5. Valve body; 6. Upstream pressure measuring chamber; 7. Downstream pressure measuring chamber; 8. Upstream pressure measuring port; 9. Downstream pressure measuring port; 10. Upstream pressure guide pipe; 11. Downstream pressure guide pipe; 12. Elastic pressure-guiding diaphragm; 13. Electric control room; 14. Control panel; 15. Dense phase conveying pipeline; 16. Air supply port; 17. Upstream air pressure collection port; 18. Downstream air pressure collection port; 19. Detection and air supply unit; 20. Raw material silo; 21. Use silo; 22. Air supply main pipeline; 23. Dust collector; 24. Conveying air source; 25. Air supply source; 26. Air supply pipe; 27. Pressure differential air supply valve. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other unless there is a conflict.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper surface", "lower surface", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "forward", "reverse", "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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0037] like Figure 1 、 2 As shown, a differential pressure detection and automatic air supply dense phase conveying system includes a dense phase conveying pipeline 15, on which an air supply port 16 is provided. An upstream air pressure collection port 17 and a downstream air pressure collection port 18 are respectively provided on the dense phase conveying pipeline 1 and upstream and downstream of the air supply port 16. The upstream air pressure collection port 17, the air supply port 16 and the downstream air pressure collection port 18 constitute a detection air supply port group. Along the dense phase conveying pipeline 15, there are multiple detection air supply port groups distributed, and one detection air supply port group corresponds to one detection air supply unit 19.

[0038] It also includes a raw material silo 20, a use silo 21 and an air supply main pipeline 22. The dense phase conveying pipeline 15 conveys the raw materials in the raw material silo 20 to the use silo 21. A dust collector 23 is provided on the use silo 21.

[0039] The dense phase conveying pipeline 15 is connected to the conveying gas source 24, the main air supply pipeline 22 is arranged along the dense phase conveying pipeline 15, the main air supply pipeline 22 is connected to the air supply source 25, and the other ends of the air supply pipes 26 in all the detection air supply units 19 are connected to the main air supply pipeline 22.

[0040] The detection and air supply unit 19 includes an air supply pipe 26, a pressure differential air supply valve 27, an upstream pressure supply pipe 10 and a downstream pressure supply pipe 11. One end of the air supply pipe 26 is connected to the air supply port 16, and the pressure differential air supply valve 27 is connected in series to the air supply pipe 26. The upstream pressure measuring port 8 and the downstream pressure measuring port 9 on the pressure differential air supply valve 27 are respectively connected to one end of the upstream pressure supply pipe 10 and one end of the downstream pressure supply pipe 11. The other end of the upstream pressure supply pipe 10 and the other end of the downstream pressure supply pipe 11 are respectively connected to the upstream air pressure collection port 17 and the downstream air pressure collection port 18. The pressure differential air supply valve 27 is used to detect the pressure difference between the upstream and downstream of the dense phase conveying pipeline 15, and control the air supply switch of the air supply channel of the air supply pipe 26 according to the pressure differential information, so as to realize automatic air supply of the pipeline section between the upstream and downstream of the dense phase conveying pipeline 15.

[0041] A pressure-transmitting medium is provided within the upstream and downstream pressure-conducting pipes 10, 11. Each of the upstream and downstream pressure-conducting pipes 10, 11 is provided with an elastic pressure-conducting diaphragm 12 at its orifice, sealing one end of the upstream and downstream pressure-conducting pipes 10, 11. The elastic pressure-conducting diaphragm 12 isolates material from the conveying pipeline while simultaneously transmitting the pressure within the conveying pipeline to the upstream and downstream pressure-conducting pipes 10, 11. The pressure-conducting medium is preferably a low-viscosity oil, including but not limited to silicone oil, mineral oil, synthetic oil, and vegetable oil.

[0042] like Figure 3 、 4 As shown, the pressure differential air supply valve includes a solenoid valve 1, a control module 2, an upstream pressure sensor 3, and a downstream pressure sensor 4. The valve body 5 of the solenoid valve 1 is provided with an upstream pressure measuring chamber 6 and a downstream pressure measuring chamber 7. The valve body 5 of the solenoid valve is provided with an upstream pressure measuring port 8 and a downstream pressure measuring port 9, which are connected to the upstream pressure measuring chamber 6 and the downstream pressure measuring chamber 7, respectively. The upstream pressure sensor 3 and the downstream pressure sensor 4 are respectively disposed in the upstream pressure measuring chamber 6 and the downstream pressure measuring chamber 7. The upstream pressure sensor 3 and the downstream pressure sensor 4 transmit pressure information to the control module 2, which controls the air supply switch of the solenoid valve 1 based on the upstream and downstream pressure differential information. By detecting differential pressure, on-demand air supply can be achieved, effectively preventing pipe blockage, increasing transmission distance, reducing conveying gas pressure and volume, and lowering terminal wind speed, thereby reducing raw material crushing rate and energy conservation.

[0043] In addition, the upstream pressure sensor and the downstream pressure sensor are differential pressure sensors. In other words, the upstream pressure sensor and the downstream pressure sensor can be replaced by differential pressure sensors, and the functions and effects of the two are the same.

[0044] An electrical control chamber 13 is located within the solenoid valve body 5, and the control module 2 is housed within this chamber. A control panel 14 is located on the solenoid valve body 5 and is electrically connected to the control module 2. The control panel 14 includes a pressure differential threshold adjustment knob, a hysteresis parameter adjustment knob, and a gas injection mode selector. Adjustment methods include knob adjustment, switch adjustment, button adjustment, and touchscreen adjustment.

[0045] Pressing the air supply mode switch allows you to select between pressure differential exceeding threshold air supply mode, pressure differential below threshold air supply mode, pressure differential interval air supply mode, and pressure differential interval no air supply mode. The differential pressure detection component and control module are integrated into the valve body, making it compact and easy to install.

[0046] like Figure 5As shown, the control module adopts analog circuit control or digital circuit control. Digital control has the advantage of intuitive adjustment. In this embodiment, analog circuit control is adopted. Analog circuit control has the advantages of fast response speed, high stability, adjustable gas injection differential pressure threshold and hysteresis characteristics, optional gas injection mode, and convenient adjustment.

[0047] Working principle: The dense phase system air supply is to achieve precise air supply according to the state of the material in the pipeline. The state of the material in the conveying pipeline is characterized by the pressure difference in the pipeline at a certain distance. The specific air supply process is achieved by detecting the air supply unit. Different materials have different characteristics, so the control parameters of the air supply timing will be different, and sometimes even opposite. Using a material with poor air permeability to introduce how the differential pressure air supply valve determines the air supply timing. There are usually three states in dense phase conveying, conveying state 1, such as Figure 6 As shown: the two adjacent material plugs are outside the pressure measuring point of the differential pressure air supply valve, and the length of the material plugs is short. At this time, the differential pressure measured by the differential pressure air supply valve is very small or zero, and no air supply is required; conveying state 2, such as Figure 7 As shown: the front plug is outside the differential pressure air supply valve pressure measuring point, and the rear plug is inside the differential pressure air supply valve pressure measuring point and in front of the air supply point. At this time, if the air pressure between the two plugs is large, it proves that the two plugs are accelerating towards each other, and air needs to be added to separate them to avoid forming a long plug and blocking the pipe. At the same time, the rear plug is accelerated to the rear to leave space for the front plug to move forward. If the air pressure between the two plugs is small and almost equal to the front pressure, it proves that the conveying state is good, the speed of the front and rear plugs is uniform, and no air needs to be added; conveying state 3, such as Figure 8 As shown: the rear plug is within the pressure measuring point of the differential pressure air supply valve and behind the air supply point. At this time, if the speed of the rear plug is slightly faster or basically the same as that of the front plug, it means that the conveying state is good and no air supply is needed. If the speed of the rear plug is much slower than that of the front plug, it means that there is a tendency of pipe blockage at the rear, and air should be added to help prevent pipe blockage.

[0048] In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are mutually inconsistent. Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A differential pressure detection and automatic air supply dense phase conveying system, comprising a dense phase conveying pipeline, characterized in that: The air inlet is connected to the air intake pipe by a pressure regulating valve, and the pressure regulating valve is connected to the pressure regulating valve at the pressure regulating valve. Automatic air supply of the pipeline section between upstream and downstream; it also includes a raw material silo, a usage silo and an air supply main pipeline, the dense phase conveying pipeline conveys the raw materials in the raw material silo to the usage silo, the dense phase conveying pipeline is connected to the conveying air source, the air supply main pipeline is arranged along the dense phase conveying pipeline, the air supply main pipeline is connected to the air supply source, and the other end of the air supply pipe in all the detection air supply units is connected to the air supply main pipeline; the pressure differential air supply valve includes a solenoid valve, a control module, an upstream pressure sensor and a downstream pressure sensor, an upstream pressure measuring chamber and a downstream pressure measuring chamber are provided in the valve body of the solenoid valve, an upstream pressure measuring port and a downstream pressure measuring port respectively connected to the upstream pressure measuring chamber and the downstream pressure measuring chamber are provided on the valve body of the solenoid valve, the upstream pressure sensor and the downstream pressure sensor are respectively arranged in the upstream pressure measuring chamber and the downstream pressure measuring chamber, the upstream pressure sensor and the downstream pressure sensor transmit pressure information to the control module, and the control module controls the air supply switch of the solenoid valve according to the upstream and downstream pressure differential information.

2. The differential pressure detection and automatic air supply dense phase conveying system according to claim 1 is characterized in that: A plurality of detection and air supply port groups are distributed along the dense phase conveying pipeline, and one detection and air supply port group corresponds to one detection and air supply unit.

3. The differential pressure detection and automatic air supply dense phase conveying system according to claim 1 is characterized in that: A pressure-conducting medium is provided in the upstream pressure-guiding pipe and the downstream pressure-guiding pipe. An elastic pressure-guiding diaphragm is provided at the pipe opening of the upstream pressure-guiding pipe and the downstream pressure-guiding pipe. The elastic pressure-guiding diaphragm seals one end of the upstream pressure-guiding pipe and the downstream pressure-guiding pipe.

4. The differential pressure detection and automatic air supply dense phase conveying system according to claim 3 is characterized by: The pressure transmission medium is low-viscosity oil.

5. The differential pressure detection and automatic air supply dense phase conveying system according to claim 4 is characterized in that: An electric control chamber is provided in the valve body of the solenoid valve, the control module is provided in the electric control chamber, and a control panel is provided on the valve body of the solenoid valve, and the control panel is electrically connected to the control module.

6. The differential pressure detection and automatic air supply dense phase conveying system according to claim 5, characterized in that: The control panel is provided with a pressure difference threshold adjustment knob, a hysteresis parameter adjustment knob and an air supply mode switching switch.

7. The differential pressure detection and automatic air supply dense phase conveying system according to claim 1, characterized in that: The upstream pressure sensor and the downstream pressure sensor are differential pressure sensors.

8. The differential pressure detection and automatic air supply dense phase conveying system according to claim 4 is characterized in that: The low-viscosity oil includes silicone oil, mineral oil, synthetic oil, and vegetable oil.

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