Airflow positive pressure conveying and discharging mechanism and conveying system
By setting up a balanced ventilation port at the discharge port of the rotary valve, the problem of the reverse flow of the leakage air in the rotary valve is solved, and the effect of reducing the impact of the counterflow is achieved, ensuring the normal discharge of the rotary valve.
Patent Information
- Application Number
- CN202411473197.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-02-07
AI Technical Summary
In the positive air pressure conveying system, the counterflow direction of the leakage air of the rotary valve is opposite to the direction of discharge, causing the leakage air volume to increase with the increase of the conveying pressure, and the counterflow speed increases, hindering the normal discharge of the rotary valve and causing the discharge speed to slow down. Or blocking materials.
The balanced vent is set up at the discharge port of the rotary valve. The balanced vent port is connected to the air source. The leakage air enters the bottom of the rotary valve through the balanced vent port. The pressure below the balanced vent port is basically the same as the pressure at the lower end of the discharge pipe, reducing the reverse leakage air flow , reduce the impact on the discharge of the rotary valve.
By setting the balanced ventilation port, the impact of leaking air on the discharge of the rotary valve is reduced, the normal discharge and discharge volume of the rotary valve is ensured, and the discharge speed is slowed down or blocked.
Smart Images
Figure CN119389793A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of air flow conveying, and in particular relates to an air flow positive pressure conveying unloading mechanism and a conveying system. Background Art
[0002] The air flow conveying system using rotary valves for feeding is widely used in industrial sites. During the positive pressure conveying process, the material falls into the conveying pipeline through the rotary valve. At the same time, due to the existence of pressure difference, the leakage direction of the rotary valve is opposite to the material feeding direction, that is, the leakage gas flows in the reverse direction and is discharged upstream of the rotary valve.
[0003] Figure 1 This is the normal process of rotary valve unloading. It can be seen that the pressure values are in the relationship of P1>P2>P3. Figure 2 It can be seen that in the discharge pipeline between the rotary valve and the conveying pipeline, due to the existence of the rotary valve leakage gas and the pressure difference ΔP (P2>P3) between the upstream and downstream of the discharge pipeline, the material flow direction and the leakage gas flow direction ( Figure 2 The leakage volume increases with the increase of the conveying pressure (the direction indicated by the hollow arrow). Therefore, as the conveying pressure increases, the leakage volume increases accordingly, resulting in an increase in the reverse flow speed of the leakage gas. The reverse upward gas will hinder the normal material discharge of the rotary valve. When the upward air flow speed reaches a certain value, the material discharge speed of the rotary valve will be affected, and the material will re-enter the rotary valve to the upstream of the rotary valve along with the leakage gas, resulting in slow material discharge or even blockage. Summary of the invention
[0004] In order to solve the defect in the prior art that the leakage of the rotary valve affects the material discharge, the present invention provides an air flow positive pressure conveying material discharge mechanism and a conveying system.
[0005] The technical solution adopted by the present invention is a positive airflow pressure conveying and unloading mechanism, comprising:
[0006] A rotary valve is used for quantitatively conveying materials, and a balanced vent is provided at its discharge port, and the balanced vent is provided at a side opposite to the position where the material starts to enter the discharge port from the rotary valve;
[0007] A feeding pipe, arranged at a feeding port of the rotary valve;
[0008] A conveying pipeline connected to the discharge pipe for conveying the material to a predetermined location;
[0009] The air source is used to provide air source power to the delivery pipeline and is connected to the balance vent.
[0010] In some embodiments, the vertical height of the balancing vent from the bottom of the valve plate rotation track of the rotary valve is 0 to 50 mm.
[0011] In some embodiments, the feed pipe is connected to the conveying pipeline via a feed shoe.
[0012] In some embodiments, the material discharge boot includes a main connecting pipe and a material discharge connecting pipe. The main connecting pipe is a pipe body of equal diameter, and its upper part is connected to the material discharge connecting pipe to form a three-way structure. The two ends of the main connecting pipe are respectively connected to the gas source and the conveying pipeline, and the material discharge connecting pipe is connected to the material discharge pipe.
[0013] The present invention also provides an airflow positive pressure conveying system, comprising the above-mentioned material discharge mechanism, and also comprising a material bin, wherein the material bin is arranged at one end of the material feed port of the rotary valve.
[0014] In some embodiments, a gate valve is further provided between the silo and the rotary valve.
[0015] In some embodiments, the conveying pipeline includes a mixing conveying pipeline and a packaging conveying pipeline, the mixing conveying pipeline is connected to the silo, the packaging conveying pipeline is connected to the packaging line, the packaging conveying pipeline is connected to the first air source, the mixing conveying pipeline is connected to the second air source, the mixing conveying pipeline and the packaging conveying pipeline are both connected to the discharge pipe, the first air source and the second air source are both connected to the balancing vent through a pipeline, and a switch valve is provided on the pipeline.
[0016] In some embodiments, a reversing valve is provided at one end of the feed pipe, and the feed pipe can be selectively connected to the mixing and conveying pipeline or the packaging and conveying pipeline through the reversing valve.
[0017] In some embodiments, a first branch pipe leading to the mixing and conveying pipeline and a second branch pipe leading to the packaging and conveying pipeline are provided at the bottom of the reversing valve. The first branch pipe is connected to the mixing and conveying pipeline through a first material discharge shoe, and a second material discharge shoe is provided between the second branch pipe and the packaging and conveying pipeline.
[0018] Beneficial effect: The present invention sets a balancing vent at the discharge port of the rotary valve, and most of the leakage gas of the rotary valve enters the bottom of the rotary valve through the balancing vent pipeline, so that the pressure at the discharge port of the rotary valve is basically the same as the pressure at the lower end of the discharge pipe, and the upward air flow in the discharge pipe opposite to the discharge direction becomes smaller, and the influence of the leakage gas of the rotary valve on the discharge of the rotary valve becomes smaller, thereby ensuring the discharge volume of the rotary valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a schematic diagram of the conventional rotary valve blanking structure;
[0020] Figure 2 This is a schematic diagram of material falling and leakage airflow of a conventional rotary valve;
[0021] Figure 3 This is a schematic diagram of the material cutting mechanism for this application;
[0022] Figure 4 This is a schematic diagram of the material dropping and leakage airflow of the rotary valve of the material dropping mechanism of this application;
[0023] Figure 5 For this application, the positive pressure air flow delivery system;
[0024] Figure 6 It is a schematic diagram of the structure of the material shoe.
[0025] In the figure, 1. rotary valve, 11. discharge port, 12. balancing vent, 13. valve plate, 2. discharge pipe, 3. conveying pipeline, 31. mixing conveying pipeline, 32. packaging conveying pipeline, 4. air source, 41. first air source, 42, second air source, 5. discharge shoe, 51. first discharge shoe, 52. second discharge shoe, 53. discharge pipe, 54. main connecting pipe, 6. steering valve, 61. first branch pipe, 62. second branch pipe, 7. silo, 71. gate valve, 100. material, 200. packaging line. DETAILED DESCRIPTION
[0026] The present application will be further described below in conjunction with specific implementation methods. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative changes belong to the protection scope of the present application.
[0027] In order to reduce the influence of the leakage of the rotary valve 1 on the material feeding in the prior art, negative pressure conveying is usually adopted to make the leakage direction of the rotary valve 1 consistent with the material 100 feeding direction, thereby not reducing the feeding speed.
[0028] In addition, in order to reduce the impact of the leakage of the rotary valve 1 on the material discharge during positive pressure delivery, a nozzle with a constricted mouth is usually provided at the connection between the gas source 4 and the discharge pipe 2. The nozzle is connected to the gas source 4, and a Venturi effect is formed between the nozzle and the discharge pipe 2, forming a negative pressure in the discharge pipe 2 to achieve the effect of "sucking" the material 100. At this time, the leakage direction of the rotary valve 1 is consistent with the discharge direction of the material 100, and the discharge speed will not be affected. However, the Venturi structure is relatively complex and the cost is relatively high.
[0029] For positive pressure delivery without Venturi structure, such as Figure 1 and 2 As shown, a pressure difference will be generated at the upper and lower ends of the feed pipe 2, and the leakage gas flow direction (such as Figure 2The direction indicated by the hollow arrow is opposite to the material 100 feeding direction. As the conveying pressure increases, the pressure difference increases accordingly, resulting in the leakage gas in the opposite direction of the material 100 flow direction affecting the material 100 feeding speed. In view of this problem, the present invention proposes the following technical solution.
[0030] like Figure 3 and 4 As shown, an airflow positive pressure conveying feeding mechanism comprises:
[0031] The rotary valve 1 is used for quantitatively conveying the material 100, and its discharge port 11 is provided with a balancing vent 12, and the balancing vent 12 is arranged on a side opposite to the position where the material 100 starts to enter the discharge port 11 from the rotary valve 1;
[0032] A feeding pipe 2, arranged at a feeding port 11 of the rotary valve 1;
[0033] A conveying pipeline 3, connected to the feeding pipe 2, for conveying the material 100 to a predetermined location;
[0034] The gas source 4 is used to provide gas source 4 power to the delivery pipeline 3 and is connected to the balance vent 12.
[0035] As analyzed above, since there is no structure such as a nozzle to form a Venturi effect between the conveying pipeline 3 and the discharge pipe 2, there is a pressure difference at both ends of the discharge pipe 2, and the flow direction of the leaked gas is opposite to the flow direction of the material 100. However, the present invention provides a balanced vent 12 connected to the gas source 4 at the discharge port 11 of the rotary valve 1, such as Figure 4 As shown, the leakage air flow is basically directly provided by the balance vent 12 on the rotary valve 1, and the leakage air flow below the balance vent 12 is basically short-circuited, that is, the reverse leakage air flow below the balance vent 12 is opposite to the material 100 feeding direction (such as Figure 4 The pressure of the discharge port 11 of the rotary valve 1 below the balance vent 12 is substantially the same as the pressure at the lower end of the discharge pipe 2 (P1>P2, P2≈P3), and the influence on the discharge of the rotary valve 1 is reduced. At the same time, the balance vent 12 is set at the position where the material 100 begins to enter the discharge port 11 of the rotary valve 1 (i.e. Figure 4 The opposite side of the position A in the middle, that is, the position where the balance vent 12 and the material 100 leave the rotary valve 1 and enter its discharge port 11 (i.e. Figure 4 The position A in the middle is relatively small, so as to avoid the air intake of the balance vent 12 affecting the normal discharge of the rotary valve 1, thereby ensuring the discharge and discharge amount of the rotary valve 1.
[0036] In some embodiments, the vertical height of the balancing vent 12 from the bottom of the rotation track of the valve plate 13 of the rotary valve 1 is 0 to 50 mm. As can be seen from the above analysis, there is still leakage airflow between the balancing vent 12 and the valve plate 13 of the rotary valve 1. If the vertical distance between the balancing vent 12 and the bottom of the rotation track of the valve plate 13 is too large, the material 100 between the balancing vent 12 and the valve plate 13 will be affected by the reverse airflow of the leakage air of the rotary valve 1 and be brought back or retained in the material trough between the rotary valve 1 plates. In the range of 0 to 50 mm, after the material 100 leaves the valve plate 13 of the rotary valve 1, it quickly falls to the position below the balancing vent 12 under the action of gravity, and the leakage air flow of the balancing vent 12 is small, which will not affect the material discharge.
[0037] In some embodiments, the feed pipe 2 is connected to the delivery pipeline 3 via a feed shoe 5. The feed shoe 5 is directly used to achieve connection without using a Venturi-related structure, which has a simple structure and is easy to install.
[0038] like Figure 5 As shown, the present invention further provides an airflow positive pressure conveying system, comprising the above-mentioned material discharge mechanism, and also comprising a material bin 7 , wherein the material bin 7 is arranged at one end of the feed port of the rotary valve 1 .
[0039] In some embodiments, in order to facilitate the on-off control between the silo 7 and the rotary valve 1, a gate valve 71 is further provided between the silo 7 and the rotary valve 1. Specifically, an electric gate valve 71 and a manual gate valve 71 may be provided.
[0040] In some embodiments, the conveying pipeline 3 includes a blending conveying pipeline 31 and a packaging conveying pipeline 32, wherein the blending conveying pipeline 31 is connected to the silo 7, the packaging conveying pipeline 32 is connected to the packaging line 200, the packaging conveying pipeline 32 is connected to the first gas source 41, the blending conveying pipeline 31 is connected to the second gas source 42, the blending conveying pipeline 31 and the packaging conveying pipeline 32 are both connected to the discharge pipe 2, the first gas source 41 and the second gas source 42 are both connected to the balancing vent 12 through a pipeline, and a switch valve is provided on the pipeline. Through the above structure, the blending function and packaging function of the conveying system can be realized, that is, when the material 100 needs to be blended, the packaging conveying pipeline 32 is closed, and the blending conveying pipeline 31 is connected to the discharge pipe 2, and the second gas source 42 is connected to the balancing vent 12 through the switch valve, and the material 100 is transported from the silo 7 back to the silo 7 through the blending conveying pipeline 31 to realize the blending cycle. Similarly, the mixing and conveying pipeline 31 is closed, the packaging conveying pipeline 32 is connected to the feeding pipe 2, and the material 100 can be conveyed to the packaging line 200 for packaging through the switch valve, the first gas source 41 and the balance vent 12. The switch valve can be designed as a pneumatic ball valve.
[0041] In some embodiments, in order to facilitate the connection between the feed pipe 2 and the mixing and conveying pipeline 31 or the packaging and conveying pipeline 32, a reversing valve 6 is provided at one end of the feed pipe 2, and the feed pipe 2 can be selectively connected to the mixing and conveying pipeline 31 or the packaging and conveying pipeline 32 through the reversing valve 6.
[0042] In some embodiments, specifically, a first branch pipe 61 leading to the mixing and conveying pipeline 31 and a second branch pipe 62 leading to the packaging and conveying pipeline 32 are provided at the bottom of the reversing valve 6, the first branch pipe 61 is connected to the mixing and conveying pipeline 31 through a first material discharge shoe 51, and a second material discharge shoe 52 is provided between the second branch pipe 62 and the packaging and conveying pipeline 32.
[0043] In some embodiments, the first material shoe 51 and the second material shoe 52 are formed as follows: Figure 6 The material discharge shoe 5 shown includes a main connecting pipe 54 and a discharge connecting pipe 53. The main connecting pipe 54 is a pipe body of equal diameter, and its upper part is connected to the discharge connecting pipe 53 to form a three-way structure. This structure will not generate negative pressure in the discharge connecting pipe 53, wherein the two ends of the main connecting pipe 54 are respectively connected to the gas source 4 and the conveying pipeline 3, wherein the discharge connecting pipe 53 is connected to the discharge pipe 2, wherein the hollow arrow indicates the main flow direction of the gas of the gas source 4 in the main connecting pipe 54.
[0044] Although the disclosure is disclosed as above, the protection scope of the disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of this application.
Claims
1. An airflow positive pressure conveying feeding mechanism, characterized in that: include: A rotary valve (1) is used for quantitatively conveying a material (100), wherein a discharge port (11) is provided with a balancing vent (12), and the balancing vent (12) is arranged on a side opposite to a position where the material (100) begins to enter the discharge port (11) from the rotary valve (1); A feed pipe (2) arranged at a feed port (11) of the rotary valve (1); A conveying pipeline (3) connected to the discharge pipe (2) for conveying the material (100) to a predetermined location; The gas source (4) is used to provide gas source (4) power to the delivery pipeline (3) and is connected to the balance vent (12).
2. The airflow positive pressure conveying feeding mechanism according to claim 1 is characterized in that: The vertical height of the balancing vent (12) from the bottom of the rotation track of the valve plate (13) of the rotary valve (1) is 0 to 50 mm.
3. The airflow positive pressure conveying feeding mechanism according to claim 1 or 2, characterized in that: The feed pipe (2) is connected to the conveying pipeline (3) via a feed shoe (5).
4. The airflow positive pressure conveying feeding mechanism according to claim 3 is characterized in that: The material discharge shoe (5) comprises a main connecting pipe (54) and a material discharge connecting pipe (53). The main connecting pipe (54) is a pipe body of equal diameter, and its upper part is connected to the material discharge connecting pipe (53) to form a three-way structure. The two ends of the main connecting pipe (54) are respectively connected to the gas source (4) and the conveying pipeline (3), wherein the material discharge connecting pipe (53) is connected to the material discharge pipe (2).
5. An air flow positive pressure conveying system, characterized in that: It comprises the unloading mechanism according to any one of claims 1 to 4, and further comprises a material bin (7), wherein the material bin (7) is arranged at one end of the feed inlet of the rotary valve (1).
6. The airflow positive pressure delivery system according to claim 5, characterized in that: A gate valve (71) is also provided between the silo (7) and the rotary valve (1).
7. The airflow positive pressure delivery system according to claim 5 or 6, characterized in that: The conveying pipeline (3) comprises a mixing conveying pipeline (31) and a packaging conveying pipeline (32); the mixing conveying pipeline (31) is connected to the silo (7); the packaging conveying pipeline (32) is connected to the packaging line (200); the packaging conveying pipeline (32) is connected to a first gas source (41); the mixing conveying pipeline (31) is connected to a second gas source (42); the mixing conveying pipeline (31) and the packaging conveying pipeline (32) are both connected to the discharge pipe (2); the first gas source (41) and the second gas source (42) are both connected to the balancing vent (12) through pipelines; a switch valve is provided on the pipeline.
8. The airflow positive pressure delivery system according to claim 7, characterized in that: A reversing valve (6) is provided at one end of the feed pipe (2), and the feed pipe (2) can selectively communicate with the mixing and conveying pipeline (31) or the packaging and conveying pipeline (32) through the reversing valve (6).
9. The airflow positive pressure delivery system according to claim 8, characterized in that: A first branch pipe (61) leading to the mixing and conveying pipeline (31) and a second branch pipe (62) leading to the packaging and conveying pipeline (32) are arranged at the bottom of the reversing valve (6); the first branch pipe (61) is connected to the mixing and conveying pipeline (31) via a first material discharge shoe (51); and a second material discharge shoe (52) is arranged between the second branch pipe (62) and the packaging and conveying pipeline (32).