Pilot-operated type automatic blowing assisting valve system for eliminating material blockage of pneumatic conveying pipeline
By designing a pilot automatic assisted valve system, the self-closing valve core and push rod structures are used to respond to pressure changes in the pipeline, and the automatic dredging of the pneumatic conveying system and low-consumption gas delivery are achieved, solving the complex design and gas consumption of the pneumatic conveying system. The problem of Yamato pipe blocking improves system reliability and operation stability.
Patent Information
- Application Number
- CN202421148305.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-24
AI Technical Summary
The existing pneumatic conveying systems have problems such as complex design, large gas consumption, fast pipe wear and easy pipe blockage, especially when there are more materials or long conveying distances, resulting in unstable system operation and difficult maintenance.
Design a pilot automatic blowing valve system, which uses compressed air to connect and air supply pipe through an acute angle angle inlet pipe, and automatically responds to the pressure changes in the pipeline through a structure composed of self-closing valve core, push rod and piston to achieve automatic response to the pressure changes in the pipeline. Turn on and off, use the linkage to form a 'one push and one pull' pneumatic conveying effect to reduce the risk of blockage.
It realizes automatic unblocking of the pneumatic conveying system, improves system reliability, reduces gas consumption and pipeline wear, simplifies the structure, avoids maintenance needs, and ensures the risk of full pipe low-speed conveying and low-pipe plugging.
Smart Images
Figure CN222249140U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pneumatic conveying, and belongs to a pneumatic conveying blow-assisting valve, in particular to a pilot-type automatic blow-assisting valve system for eliminating material blockage in a pneumatic conveying pipeline. Background Art
[0002] Pneumatic conveying is a conveying technology for granular materials, which is widely used in thermal power, metallurgy, chemical industry and other fields. However, due to the many shortcomings of the previous conveying system itself, pipe blockage often occurs with the increase of materials or the long conveying distance. Therefore, after technical improvements, a compressed air pipeline is added next to the conveying pipeline, and a compressed air blowing device is installed on the conveying pipeline. The purpose is to add compressed air to the conveying pipeline when the pipe is blocked to blow away the materials at the blocked pipe. At present, the valves used in the pipeline blowing device in the market are mostly air-controlled stop valves or electric valves. The action of these valves must be driven by corresponding electrical components such as solenoid valves or electric heads. There are several control methods: one is to use a pressure transmitter to convert the pressure in the conveying pipeline into an electrical signal through the pressure transmitter, and then after PLC processing, the output electrical signal controls the corresponding solenoid valve, and the action of the blowing valve is controlled by the solenoid valve; the second is to use a pressure switch to directly detect the pressure in the conveying pipeline, transmit the electrical signal to the solenoid valve through the pressure switch, and then control the action of the blowing valve through the solenoid valve. The use of these electrical components for control, firstly, greatly increases the manufacturing cost due to the complex structure, and secondly, too many control points and high failure rate affect the reliability of the pneumatic conveying system. In addition, most of the pipe networks extend to the outdoor silos, and some electrical components need to be waterproofed, which increases the cost. Regardless of the form of control of the pneumatic conveying blowing device, there are the following shortcomings: 1. It cannot be transported over long distances. 2. It has an electrical control system with a complex structure and high failure rate. 3. It consumes a lot of gas. 4. High-speed transportation causes rapid wear on the pipeline. 5. Pipe blockage is prone to occur when the amount of materials increases or the distance is long. Utility Model Content
[0003] The utility model aims to provide a pilot-operated automatic blow-assist valve system for eliminating material blockage in a pneumatic conveying pipeline. The system has a reasonable structure and can automatically open when material blockage occurs in the conveying pipeline and automatically close after the conveying pipeline is unblocked, thereby improving the reliability of the operation of the pneumatic conveying system, achieving full-pipe low-speed conveying, low gas consumption, no pipe blockage, simple structure and maintenance-free.
[0004] The purpose of the utility model is achieved as follows: a pilot automatic blowing valve system for eliminating material blockage in a pneumatic conveying pipeline, in which an air intake pipe having an acute angle with the material conveying direction of the material conveying pipeline is respectively arranged on the material conveying pipelines before and after the material blockage in the material conveying pipeline, and an air supply pipe corresponding to the air intake pipe is respectively arranged on the compressed air pipeline parallel to the material conveying pipeline, the air inlet and air outlet of the first pilot automatic blowing valve and the second pilot automatic blowing valve are respectively connected to the air supply pipe on the corresponding compressed air pipeline and the air inlet pipe of the material conveying pipeline, and the linkage air outlet of the first pilot automatic blowing valve is connected to the linkage air inlet of the second pilot automatic blowing valve through a hose.
[0005] The utility model belongs to the technical field of pneumatic conveying, and effectively solves the problems of traditional pneumatic conveying, such as complex design, easy pipe blockage, high gas consumption, and rapid pipe wear. The valve has a simple design structure, and is composed of a spring self-closing valve core, a push rod, a piston and a valve body. Its working principle is: compressed air enters from the air inlet interface, enters the first and second chambers of the valve through the pilot air inlet hole, and then flows out through the linkage air outlet hole and the air outlet interface. When the ash conveying pipeline is blocked between the 1# valve and the 2# valve, the pressure in the first and second chambers of the 1# valve increases. When the pressure increases to a value greater than the spring pressure on the upper part of the valve core, the piston pushes the self-closing valve core, and the main air source enters from the air inlet and is ejected from the air outlet to assist in blowing the blocked part of the ash conveying pipeline. At the same time, the compressed air flowing out of the linkage air outlet will link the second chamber of the 2# valve to increase the pressure. The action mode of the 2# valve is the same as that of the 1# valve. When the 2# valve assists in blowing, a negative pressure suction effect will be formed at the blocked part. In this way, the 1# valve pushes the 2# valve to suck, forming a "push and pull" conveying effect, thereby effectively solving the problem of pneumatic conveying pipe blockage. When the blocked pipe is unblocked, the pilot pneumatic conveying automatic blow-assist valve will automatically close.
[0006] Compressed air enters from the valve air inlet, enters from the pilot air inlet hole, enters the first chamber through the vent hole, and enters the second chamber through the pilot air path. When a certain pressure is reached, the one-way valve core opens and flows out from the air outlet.
[0007] When the material is blocked at the outlet of the pilot pneumatic conveying automatic blowing valve, the pressure in the ash conveying pipeline increases. Due to the back pressure of the one-way valve core, the compressed air from the pilot air vent cannot open the one-way valve core. The pilot air flow pressure in the first chamber and the second chamber increases continuously. When it reaches 0.2Mpa-0.25Mpa, the compressed air pushes the piston, and the push rod connected to the piston pushes the self-closing valve core. When the valve core is opened, the main compressed air quickly enters the first chamber (the main compressed air pressure is about 0.5Mpa, and the ash conveying pipeline pressure is about 0.2Mpa), and the one-way valve core is quickly opened to be discharged from the air outlet. When the pressure in the first chamber increases, the compressed air flows out through the linkage air outlet, flows into the linkage air inlet of the next pilot pneumatic conveying automatic blowing valve through the hose, pushes the piston of the next valve to move, and opens the self-closing valve core of the next valve through the push rod. The main air source of the next valve enters from the air inlet and flows out from the air outlet, forming a linkage function of two adjacent valves.
[0008] Technical features:
[0009] 1. The valve core will be automatically opened according to the pressure change in the delivery pipeline using pilot technology;
[0010] 2. This pilot-operated pneumatic conveying automatic blow-assist valve is a pneumatic valve. When the pressure in the pipeline rises to a certain range after the material in the conveying pipeline is blocked, the valve will automatically open to supplement the high-pressure blow-assist disturbance in the pipeline.
[0011] 3. The pilot air circuit design and internal structure of the valve body of the valve need patent protection. The pilot air circuit is designed to be concentric with the self-closing valve core, push rod and piston. The main air source of the air inlet enters the first chamber and the second chamber through the pilot air circuit.
[0012] 4. The utility model has the function of linkage action of adjacent valves of the same type.
[0013] The utility model discloses the pneumatic conveying system is simple in structure and can automatically open when the conveying pipeline is blocked by materials, and automatically close when the conveying pipeline is unblocked, thereby improving the reliability of the pneumatic conveying system operation, and can achieve full pipe and low-speed conveying, with low gas consumption and no pipe blockage, and has a simple structure and is maintenance-free. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The utility model will be further described below in conjunction with the accompanying drawings. Figure 1 It is a structural schematic diagram of the utility model. Figure 2 It is a schematic diagram of the cross-sectional structure of a pilot-operated automatic blow-assist valve. DETAILED DESCRIPTION
[0015] A pilot-operated automatic blow-assist valve system for eliminating material blockage in pneumatic conveying pipelines, such as Figure 1 , Figure 2As shown, air intake pipes 3 with acute angles to the feeding direction of the feed pipeline are respectively arranged on the feed pipeline 1 before and after the material blockage 2 of the feed pipeline, and air supply pipes 5 corresponding to the air intake pipes 3 are respectively arranged on the compressed air pipeline 4 parallel to the feed pipeline 1, and the air inlet and air outlet of the first pilot automatic blowing valve 6 and the second pilot automatic blowing valve 8 are respectively connected to the corresponding air supply pipes 5 on the compressed air pipeline 4 and the air inlet pipe 3 of the feed pipeline 1, and the linkage air outlet 17 of the first pilot automatic blowing valve 6 and the linkage air inlet 21 of the second pilot automatic blowing valve 8 are connected through a hose 7. The first pilot-operated automatic blow-assisting valve 6 and the second pilot-operated automatic blow-assisting valve 8 are structured as follows: a self-closing valve chamber, a push tube chamber and a piston chamber are sequentially arranged from top to bottom in an upright valve body 9; an air intake interface pipe 10 is connected to the upper opening in the self-closing valve chamber through a thread; the air intake interface pipe 10 is matched with a valve seat by a self-closing valve core 12 controlled by a self-closing spring 11; a screw hole penetrating from top to bottom is arranged in the center of the self-closing valve core 12 and is connected to a transverse pilot air intake hole 13 arranged on the self-closing valve core 12; an adjusting bolt 14 is installed in the screw hole to adjust the opening of the pilot air intake hole 13; a push tube 15 arranged at the lower end of the self-closing valve core 12 and a push tube chamber are arranged between the push tube chamber and the self-closing valve core 12; a screw hole penetrating from top to bottom is arranged in the center of the self-closing valve core 12 and is connected to a transverse pilot air intake hole 13 arranged on ... The valve body is provided with a vent hole 16 on the wall of the push tube, a piston 18 is installed in the piston cavity, the central guide rod at the upper end of the piston 18 is matched with the push tube 15, a pilot air path 19 is provided at the center of the piston, and the pilot air path 19 is connected with the central guide rod. A second chamber 20 is provided between the bottom of the piston 18 and the bottom of the piston cavity, and a linkage air inlet 21 connected with the second chamber 20 is provided on the bottom of the valve cavity. A first chamber 22 connected with the push tube cavity is provided on the side of the middle part of the valve body, and a linkage air outlet 17 is provided in the first chamber 22. A one-way valve is installed at the outlet of the first chamber 22, and an air outlet interface 25 is provided at the air outlet of the one-way valve. The angle between the air inlet pipe 3 provided on the conveying pipeline 1 and the axis of the conveying direction of the conveying pipeline is 30°C-40°C. The structure of the piston 18 is that a small-diameter secondary piston is arranged on a main piston with a large diameter to form a disc-shaped stepped composite piston, and the sealing members 23 are arranged on the circumferential surfaces of the main piston and the secondary piston to match with the piston cavity wall. The centers of the self-closing valve core 12, the push tube 15, and the piston 18 are on the same straight line. The structure of the air intake interface pipe 10 is that the upper end of the interface pipe cavity is provided with an air inlet with a reduced diameter port, the air inlet is provided with an internal thread, and the lower part of the interface pipe is provided with an external thread. The upper end of the self-closing spring 11 installed in the interface pipe matches the lower end surface of the reduced diameter air inlet, and the self-closing valve core 12 is installed at the lower end of the self-closing spring 11. A one-way valve 24 is arranged at the outlet of the first chamber 22, and the one-way valve 24 is connected to the valve body by threads, and an internal thread is arranged at the outlet interface 25 in the one-way valve body. An external thread is arranged on the outer wall of the air inlet end of the valve body of the one-way valve 24. The length of the push tube 15 is longer than the length of the push tube cavity.
Claims
1. A pilot-operated automatic blow-assist valve system for eliminating material blockage in a pneumatic conveying pipeline, characterized in that: On the material delivery pipeline (1) before and after the material blockage point (2) of the material delivery pipeline, air intake pipes (3) with an acute angle with the material delivery direction of the material delivery pipeline are respectively arranged, and on the compressed air pipeline (4) parallel to the material delivery pipeline (1), air supply pipes (5) corresponding to the air intake pipes (3) are respectively arranged, and the air intake and air outlet of the first pilot automatic blow-assisting valve (6) and the second pilot automatic blow-assisting valve (8) are respectively connected to the corresponding air supply pipes (5) on the compressed air pipeline (4) and the air intake pipe (3) of the material delivery pipeline (1), and the linkage air outlet (17) of the first pilot automatic blow-assisting valve (6) and the linkage air intake (21) of the second pilot automatic blow-assisting valve (8) are connected through a hose (7).
2. According to claim 1, a pilot-operated automatic blow-assist valve system for eliminating material blockage in a pneumatic conveying pipeline is characterized in that: The first pilot-operated automatic blow-assisting valve (6) and the second pilot-operated automatic blow-assisting valve (8) are structured as follows: a self-closing valve chamber, a push tube chamber and a piston chamber are sequentially arranged in a vertical valve body (9) from top to bottom; an air intake interface pipe (10) is connected to the upper opening of the self-closing valve chamber by a thread; the air intake interface pipe (10) is connected to the self-closing valve core (12) by a self-closing spring (11), so that the self-closing valve core (12) and the valve seat are matched; a screw hole that passes through from top to bottom is arranged in the center of the self-closing valve core (12) and is connected to a transverse pilot air intake hole (13) arranged on the self-closing valve core (12); an adjusting bolt (14) is installed in the screw hole to adjust the opening of the pilot air intake hole (13); a push tube (15) arranged at the lower end of the self-closing valve core (12) is connected to the push tube chamber The invention relates to a valve body having a clearance fit, a vent hole (16) is arranged on the wall of the push tube, a piston (18) is installed in the piston cavity, a central guide rod at the upper end of the piston (18) is matched with the push tube (15), a pilot air path (19) is arranged at the center of the piston and is connected with the central guide rod, a second chamber (20) is arranged between the bottom of the piston (18) and the bottom surface of the piston cavity, a linkage air inlet (21) connected with the second chamber (20) is arranged on the bottom surface of the valve cavity, a first chamber (22) connected with the push tube cavity is arranged on the side of the middle part of the valve body, a linkage air outlet (17) is arranged in the first chamber (22), a one-way valve is installed at the outlet of the first chamber (22), and an air outlet interface (25) is arranged at the air outlet of the one-way valve.
3. According to claim 1, a pilot-operated automatic blow-assist valve system for eliminating material blockage in a pneumatic conveying pipeline is characterized by: The angle between the air intake pipe (3) arranged on the material conveying pipeline (1) and the axis of the material conveying direction of the material conveying pipeline is 30°C-40°C.
4. The pilot-operated automatic blow-assist valve system for eliminating material blockage in a pneumatic conveying pipeline according to claim 1 is characterized in that: The structure of the piston (18) is that a small-diameter secondary piston is arranged on a large-diameter main piston to form a disc-shaped stepped composite piston, and sealing members (23) are arranged on the circumferential surfaces of the main piston and the secondary piston respectively to cooperate with the piston cavity wall.
5. According to claim 1, a pilot-operated automatic blow-assist valve system for eliminating material blockage in a pneumatic conveying pipeline is characterized by: The centers of the self-closing valve core (12), the push tube (15) and the piston (18) are on the same straight line.
6. The pilot-operated automatic blow-assist valve system for eliminating material blockage in a pneumatic conveying pipeline according to claim 1 is characterized in that: The structure of the air intake interface pipe (10) is that the upper end of the interface pipe cavity is provided with an air intake port with a reduced diameter, the air intake port is provided with an internal thread, and the lower part of the interface pipe is provided with an external thread. The upper end of a self-closing spring (11) installed in the interface pipe is matched with the lower end surface of the reduced diameter air intake port, and a self-closing valve core (12) is installed at the lower end of the self-closing spring (11).
7. The pilot-operated automatic blow-assist valve system for eliminating material blockage in a pneumatic conveying pipeline according to claim 2 is characterized in that: A one-way valve (24) is arranged at the outlet of the first chamber (22), the one-way valve (24) is connected to the valve body via a thread, and an internal thread is arranged at the air outlet interface (25) in the one-way valve body.
8. The pilot-operated automatic blow-assist valve system for eliminating material blockage in a pneumatic conveying pipeline according to claim 2 is characterized in that: An external thread is arranged on the outer wall of the air inlet end of the valve body of the one-way valve (24).
9. The pilot-operated automatic blow-assist valve system for eliminating material blockage in a pneumatic conveying pipeline according to claim 1 is characterized in that: The length of the push tube (15) is longer than the length of the push tube cavity.