Pneumatic cleaning valve and pneumatic cleaning system for stock bin

Abstract

The pneumatic cleaning valve comprises a valve body internally provided with a gas channel, a valve rod arranged in the valve body in a penetrating mode in the longitudinal direction and a reset spring arranged in the valve body, one end of the valve body is an air inlet, the other end of the valve body is an air outlet, and the end, facing the air outlet, of the valve rod extends outwards to form a plugging head. The plugging head is provided with a plugging part for plugging the air outlet and a connecting part which is used for connecting the plugging part and the valve rod and is a conical surface; the reset spring is connected with the valve rod, the pipe diameter of the gas channel in the valve body is gradually reduced from the gas inlet to the gas outlet, and the peripheral face, located on the outer side of the gas outlet, of the plugging part is chamfered. The pneumatic cleaning system comprises compressors and a plurality of pulse valves, the compressors are connected with the pulse valves one by one through connecting pipelines, any pulse valve is communicated with one pneumatic cleaning valve, and the pneumatic cleaning valves are installed at the conical section of the stock bin at intervals. According to the utility model, the gas consumption can be reduced while the gas can be blown out at 360 degrees along the axial direction.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of pneumatic cleaning valve and pneumatic cleaning system for silo cleaning technology equipment field. BACKGROUND

[0002] In the field of silo, silo is generally composed of different shapes of cylinder or cone with large upper opening and small lower opening, raw materials fall from top to bottom by self gravity, and the falling raw materials flow in the silo, the area gradually decreases when flowing downward, which forms greater extrusion to raw materials itself, increases the external force and probability of fine material sticking to the inner wall of silo, and the flow direction of raw materials is from the inner wall of silo to the center of the drop pipe, so raw materials may not form large scouring to the inner wall of silo, therefore, under natural conditions, fine powder is easily stuck to the inner wall of silo, which rapidly increases the friction coefficient, and raw material powder in the inner wall of silo is accumulated layer by layer, which eventually causes the blockage of cylinder or cone silo. Once blocked, it will affect the subsequent silo discharge, and in severe cases, it needs to be shut down for maintenance, which affects the continuous production of process.

[0003] The existing solutions to the problem of silo blockage usually adopt four ways of hydraulic dredging machine, air cannon, mechanical vibration and pneumatic blowing, among which, the hydraulic dredging machine is difficult to maintain, and has limitations on the shape of raw material silo. The air trajectory of air cannon is not ideal, and it can only strike in the direction of material flow, and the cleaning effect of air cannon and mechanical vibration is limited, and personnel assistance is needed during the cleaning process, which increases the working intensity of personnel and the degree of danger of operation, and mechanical vibration will lose its effect when dealing with wet material agglomeration. Pneumatic blowing uses air with certain pressure to clean and dredge, and air blowing is used during normal discharge process to avoid blockage.

[0004] In order to solve the problem of easy blockage of the discharge port of the silo, the patent CN221795691U discloses a pneumatic cleaning valve for a storage silo and a silo pneumatic cleaning system, which comprises a valve body, a reset spring arranged in the valve body, and a valve rod connected with the reset spring, and further comprises an airflow dispersion structure; the valve body has a gas passage, the valve rod is horizontally arranged in the gas passage, and one end of the valve rod extends out of the gas passage and is connected with a plugging head, and the plugging head is located at the gas outlet of the gas passage; the airflow dispersion structure comprises a spring guide rod arranged on the valve rod and an airflow distribution block arranged at one end of the spring guide rod, and at least five circular-arc-shaped shunt holes are uniformly arranged on the outer circumferential surface of the airflow distribution block. The above-mentioned airflow is blown out radially 360 degrees through the gap between the plugging head and the valve body after passing through the shunt holes, and the airflow blown out 360 degrees can blow away the material adhering to the inner wall of the silo, thereby preventing the silo from being blocked and affecting the subsequent silo discharge. However, the airflow blown out by the existing pneumatic cleaning valve can only be blown out radially 360 degrees, and the 360-degree airflow is circularly and diametrically jetted and cleaned, the gas consumption of each jetting is large, the jetting diameter is reduced for materials with large specific gravity, and only the material adhering to the circumferential direction of the silo can be blown away, and the bottom of the silo outlet cannot be jetted and cleaned. Content of the utility model

[0005] The utility model aims at providing a pneumatic cleaning valve and a pneumatic cleaning system for a silo, and airflow can be blown out 360 degrees along the axial direction while reducing the gas consumption.

[0006] In order to solve the above technical problems, the utility model adopts the specific scheme of a pneumatic cleaning valve for a silo, which comprises a valve body with a gas passage, a valve rod longitudinally arranged in the valve body, and a reset spring arranged in the valve body, one end of the valve body is an air inlet, the other end is an air outlet, one end of the valve rod facing the air outlet extends outward to form a plugging head for plugging the air outlet of the valve body, the plugging head has a plugging part for plugging the air outlet and a connecting part for connecting the plugging part with the valve rod, and the connecting part is a conical surface; the reset spring is connected with the valve rod, the pipe diameter of the gas passage in the valve body gradually decreases from the air inlet to the air outlet, and the outer circumferential surface of the plugging part located outside the air outlet is rounded.

[0007] As another optimization scheme of the above-mentioned pneumatic cleaning valve for a silo: the outer circumferential surface of the plugging part extends horizontally outward to form a diversion disc abutting against the outer end surface of the air outlet of the valve body; a cylindrical closed arc plate is arranged on the outer circumferential surface of the connecting part, and a directional blowing gap is formed between the two ends of the cylindrical closed arc plate.

[0008] As another optimized solution for the pneumatic cleaning valve for the aforementioned silo: a spring guide sleeve is fitted around the outer periphery of the valve stem facing the air inlet, a return spring is fitted on the spring guide sleeve, and an airflow distribution block is fixed at the end of the spring guide sleeve away from the air inlet. The airflow distribution block abuts against the gas passage of the valve body, and multiple arc-shaped diversion holes are evenly distributed on the outer periphery of the airflow distribution block; one end of the return spring abuts against the airflow distribution block, and the other end is connected to a spring clamping block fixed on the valve stem.

[0009] As another optimized solution for the pneumatic cleaning valve used in the aforementioned silo: the gas pipeline inside the valve body is a three-section Venturi structure. The diameter of the gas channel is divided into three sections from the inlet to the outlet. The connection between the first, second, and third sections forms a circumferential step, and the airflow distribution block rests on the circumferential step of the first section.

[0010] As another optimized solution for the pneumatic cleaning valve used in the aforementioned silo, the number of diversion holes on the airflow distribution block is 2-4.

[0011] As another optimized solution for the pneumatic cleaning valve used in the aforementioned silo, the number of flow distribution holes on the airflow distribution block is three.

[0012] As another optimized solution for the pneumatic cleaning valve used in the aforementioned silo: the structure of the spring clamping block is consistent with the structure of the airflow distribution block, and the diversion holes on the airflow distribution block are connected to the diversion holes on the spring clamping block.

[0013] As another optimized solution for the pneumatic cleaning valve used in the aforementioned silo, one end of the valve body's air inlet is connected to a pulse connection pipe for connecting to a pulse valve.

[0014] A pneumatic cleaning system for a silo includes a compressor and multiple pulse valves. The compressor is connected to each pulse valve via connecting pipes. Each pulse valve is connected to one of the aforementioned pneumatic cleaning valves for silos. The multiple pneumatic cleaning valves are installed at intervals in the conical section of the silo.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. In this utility model, the valve stem is horizontally inserted into the gas channel of the valve body. The valve stem is connected to the valve body via a return spring located within the gas channel. The end of the valve stem facing the outlet is connected to the sealing part of the sealing head via a connecting part. The outer circumferential surface of the connecting part is conical, and the outer circumferential surface of the sealing part is rounded. The sealing part can block the outlet of the gas channel under the return force of the return spring. After the airflow enters the gas channel through the inlet, it pushes the sealing head downward to open the outlet. After the outlet opens, the airflow is sprayed out 360 degrees axially, dispersing the material located at the bottom of the hopper outlet and preventing material blockage. In addition, the gas channel inside the valve body is a Venturi structure with a gradually decreasing pipe diameter from the inlet to the outlet. After the airflow enters through the inlet, its velocity gradually increases and its pressure gradually decreases. Compared with the prior art, this reduces gas consumption while ensuring the blowing effect.

[0017] 2. Furthermore, in this invention, the blocking part extends horizontally outward to form a diversion disc that can abut against the outer end of the valve body's air outlet. The diversion disc allows the airflow ejected from the outlet to be ejected radially 360 degrees. Additionally, the cylindrical sealing arc plate on the outer circumference of the connecting part can block the airflow, causing the airflow to be directed through a directional jetting notch formed between the two ends of the cylindrical sealing arc plate. Under the same pressure and air volume conditions, customized directional jetting, by changing the closing angle of the cylindrical sealing arc plate, can adjust the size of the directional jetting notch, thereby increasing the jetting pressure and jetting distance, thus achieving anti-clogging jetting cleaning treatment at special locations under different working conditions.

[0018] 3. Furthermore, the airflow distribution block of this utility model has three arc-shaped diversion holes evenly distributed on its outer peripheral surface. Compared with the existing five diversion holes, the three diversion holes reduce the airflow passage area and increase the airflow compression ratio. Combined with the Venturi effect of the valve body gas channel, the airflow consumption is reduced. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure and a schematic diagram of the cross-sectional structure along the AA direction of this utility model;

[0020] Figure 2 This is a front view and a cross-sectional view along the BB direction of the valve body of this utility model.

[0021] Figure 3 This is a schematic diagram showing the airflow being blown out 360 degrees axially when the outer periphery of the sealing part in Example 1 has rounded corners;

[0022] Figure 4 This is a schematic diagram of the airflow being directed 180 degrees after the cylindrical closed arc plate and the diversion disk are set in Example 2;

[0023] Figure 5This is a schematic diagram of the airflow being directed at 60 degrees after the closing angle of the cylindrical closed arc plate is changed in Example 2;

[0024] Figure 6 This is a schematic diagram of the main structure of the sealing part in Example 1;

[0025] Figure 7 This is a schematic diagram of the sealing head in Example 2;

[0026] Figure 8 This is an exploded view of the present invention;

[0027] Figure 9 A schematic diagram of a structure in which the airflow distribution block is mounted on a spring guide cylinder;

[0028] Figure 10 This is a schematic diagram of the connection between the compressor, pulse valve, and pneumatic cleaning valve in a pneumatic cleaning system.

[0029] Reference numerals: 1. Valve body; 101. Gas passage; 1011. Inlet; 1012. Outlet; 1013. First stage; 1014. Second stage; 1015. Third stage; 2. Pulse connection pipe; 3. Base; 4. Valve stem; 401. Spring clamping block; 402. Spring guide cylinder; 403. Airflow distribution block; 4031. Diverting hole; 404. Plug head; 4041. Connecting part; 4042. Pluging part; 405. Diverting disc; 406. Cylindrical closed arc plate; 5. Return spring; 6. Pulse valve; 7. Connecting pipe; 8. Compressor. Detailed Implementation

[0030] The technical solution of this utility model will be further described in detail below with reference to specific embodiments. Parts of this utility model that are not described in detail in the following embodiments, such as the structure and function of the compressor and pulse valve, should be known or should be known by those skilled in the art.

[0031] Example 1

[0032] like Figure 1 and Figure 8 As shown, a pneumatic cleaning valve for a silo includes a valve body 1, a valve stem 4, and a return spring 5. An air passage 101 is formed within the valve body 1 along its axial direction. The valve stem 4 extends longitudinally within the valve body 1. The return spring 5 is disposed within the valve body 1 and connected to the valve stem 4. Figure 1 As shown, a base 3 is fixed to the outer periphery of the valve body 1 near its lower end by a locking nut, and the valve body 1 can be welded to the silo wall via the base 3.

[0033] like Figure 2As shown, the upper end of the valve body 1 is the air inlet 1011 for compressed air to enter the gas channel 101, and the lower end of the valve body 1 is the air outlet 1012 for compressed air to be blown out from the gas channel 101. The diameter of the gas channel 101 inside the valve body 1 is a three-section Venturi structure that gradually decreases from the air inlet 1011 to the air outlet 1012. The diameter of the gas channel 101 is divided into three sections from the air inlet 1011 to the air outlet 1012: section 1013, section 1014, and section 1015. The diameter of section 1013 is larger than that of section 1014, which is larger than that of section 1015.

[0034] Within the gas channel 101, circumferential steps are formed at the connection points between the first section 1013 and the second section 1014, and between the second section 1014 and the third section 1015. As the compressed airflow enters the gas channel 101 through the inlet 1011 and is then ejected through the outlet 1012, its speed gradually increases and its pressure decreases. This ensures that the compressed airflow is ejected normally to disperse the material, ensuring normal material discharge from the silo. Furthermore, it can save compressed airflow to a certain extent and reduce air consumption.

[0035] like Figure 1 As shown, the lower end of the valve stem 4 near the air outlet 1012 extends outward to form a sealing head 404, which is used to block the air outlet 1012 of the valve body 1. The sealing head 404 has a sealing part 4042 and a connecting part 4041. The sealing part 4042 is used to block the air outlet 1012 of the valve body 1. The sealing part 4042 is connected to the lower end of the valve stem 4 through the connecting part 4041. The outer peripheral surface of the connecting part 4041 is a conical surface. The inner peripheral surface of the valve body 1 at the end located at the air outlet 1012 is a cone that abuts against and matches the conical surface of the connecting part 4041. A channel for airflow is formed between the conical inner peripheral surface of the air outlet 1012 of the valve body 1 and the connecting part 4041.

[0036] In addition, such as Figure 1 and Figure 6 As shown, the outer circumferential surface of the sealing part 4042 located outside the air outlet 1012 of the valve body 1 is rounded, allowing compressed air to be ejected through the channel and the rounded outer circumferential arc surface of the sealing part 4042. Figure 3 As shown, the compressed airflow is ejected 360 degrees axially in the direction indicated by the arrow in the figure. The axially ejected compressed airflow can effectively impact the arching inside the silo, achieving arch-breaking treatment to prevent blockage and clean up blockages.

[0037] A spring guide cylinder 402 is fitted around the outer periphery of the end of the valve stem 4 facing the air inlet 1011. The valve stem 4 slides through the spring guide cylinder 402. Two straight guide plates (not shown in the figure) are symmetrically arranged around the outer periphery of the valve stem 4 along its length. Two sliding grooves (not shown in the figure) are opened on the inner wall of the corresponding cylinder of the spring guide cylinder 402 along its length. The straight guide plates can be inserted into the sliding grooves on the corresponding sides so that the valve stem 4 can slide up and down along the length of the spring guide cylinder 402.

[0038] like Figure 9 As shown, an airflow distribution block 403 is fitted onto the upper part of the spring guide cylinder 402 facing the sealing head 404. The airflow distribution block 403 has a mounting hole in its center for the spring guide cylinder 402 to pass through. The airflow distribution block 403 is fitted onto the spring guide cylinder 402 and is interference-fitted with it. Three arc-shaped diversion holes 4031 are evenly distributed on the outer circumferential surface of the airflow distribution block 403. Compared to existing systems with five or more diversion holes 4031, these three diversion holes 4031 change the cross-sectional area through which the compressed airflow passes, thus adjusting the flow rate of the compressed airflow. The outer circumferential surface of the airflow distribution block 403 is arc-shaped to fit the arc-shaped inner wall of the valve body 1, and the lower outer circumferential surface of the airflow distribution block 403 abuts against a circumferential step of section 1013.

[0039] like Figure 1 and Figure 8 As shown, the return spring 5 is sleeved on the spring guide cylinder 402, and the lower end of the return spring 5 abuts against the upper surface of the airflow distribution block 403. The upper end of the return spring 5 is connected to a spring clamping block 401, which is fixed to the valve stem 4 near its upper end by a locking nut. The structure of the spring clamping block 401 is the same as that of the airflow distribution block 403. The middle part of the spring clamping block 401 also has a mounting hole for the valve stem 4 to pass through. The outer circumference of the spring clamping block 401 also has three arc-shaped diversion holes 4031 evenly distributed. The diversion holes 4031 on the airflow distribution block 403 are correspondingly connected to the diversion holes 4031 on the spring clamping block 401.

[0040] When the compressed airflow enters the gas channel 101 through the inlet 1011, it is split by the three diversion holes 4031 on the spring clamping block 401. The split compressed airflow enters the first section 1013 of the Venturi structure, and then enters the second section 1014 of the Venturi structure through the three airflow holes on the airflow distribution block 403. At this time, the flow rate of the compressed airflow increases and the pressure decreases. Subsequently, the compressed airflow enters the third section 1015 of the Venturi structure, where the flow rate of the compressed airflow further increases and the pressure further decreases. Then, the compressed airflow impacts and pushes the sealing head 404, which drives the valve stem 4 to move down and open the outlet 1012. Subsequently, the compressed airflow is sprayed out 360 degrees axially along the outer peripheral surface of the channel and the rounded corner of the sealing part 4042. The airflow effectively impacts the arching inside the hopper along the axial direction of the valve body, achieving arch-breaking treatment for anti-blocking and cleaning.

[0041] Multiple pneumatic cleaning valves are installed at intervals in the conical section of the silo. One end of the air inlet 1011 of each pneumatic cleaning valve body 1 is connected to a pulse connection pipe 2. The pulse connection pipe 2 is connected to the compressor 8 via a connecting pipe 7, forming a pneumatic cleaning system. Multiple pulse valves 6 are installed in the pneumatic cleaning system, and each pulse valve 6 is connected to a pneumatic cleaning valve via the pulse connection pipe 2. The multiple pulse valves 6 are connected to the compressor 8 via the connecting pipe 7. In actual engineering, the working air source pressure is 0.5-0.8 MPa. The combination of the pneumatic cleaning valves and the pulse valves 6 can achieve pulse-type cleaning, and coordinated pulse cleaning can be achieved by controlling the pulse valves 6.

[0042] The above are the basic embodiments of this utility model. Further improvements, optimizations, and limitations can be made based on the above to obtain the following embodiments:

[0043] Example 2

[0044] This embodiment is an improvement on embodiment 1. Its main structure is the same as that of embodiment 1, but the improvement lies in: [The following is a more detailed description of the improvement.] Figure 4 and Figure 7 As shown, the outer peripheral surface of the sealing part 4042 extends horizontally outward to form a diversion disc 405. The diversion disc 405 can abut against the outer end face of the air outlet 1012 of the valve body 1. A cylindrical closed arc plate 406 is provided on the outer peripheral surface of the connecting part 4041. A 180-degree fan-shaped directional blowing notch is formed between the two ends of the cylindrical closed arc plate 406.

[0045] When the compressed airflow moves from the inlet 1011 to the third section 1015 of the gas passage 101, the impact of the compressed airflow can push the cylindrical closed arc plate 406 to move the sealing head 404 downward and open the outlet 1012. At the same time, the cylindrical closed arc plate 406, which is set at a 180-degree angle around the connecting part 4041, blocks the corresponding compressed airflow from being ejected from the outlet 1012, allowing the compressed airflow to travel along... Figure 4 The arrows shown indicate that the air is blown out at a 180-degree angle to meet the anti-clogging cleaning requirements under special working conditions.

[0046] Furthermore, different angles of directional jetting notches can be obtained by changing the size of the 406 circular arc of the cylindrical closed arc plate, such as... Figure 5 As shown in the figure, the included angle of the directional jet notch is 60 degrees. The compressed airflow can pass through the 60-degree directional jet, which can increase the jet pressure and jet distance, thereby achieving anti-clogging jet cleaning treatment at special points under different working conditions.

Claims

1. A pneumatic cleaning valve for a silo, comprising a valve body (1) having an internal gas passage (101), a valve stem (4) extending longitudinally within the valve body (1), and a return spring (5) disposed within the valve body (1), one end of the valve body (1) being an air inlet (1011) and the other end being an air outlet (1012), the valve stem (4) extending outward from the end facing the air outlet (1012) to form a sealing head (404) for sealing the air outlet (1012) of the valve body (1), the sealing head (404) having a sealing portion (4042) for sealing the air outlet (1012) and a connecting portion (4041) for connecting the sealing portion (4042) to the valve stem (4), the connecting portion (4041) being a conical surface; the return spring (5) being connected to the valve stem (4), characterized in that: The diameter of the gas passage (101) inside the valve body (1) gradually decreases from the inlet (1011) to the outlet (1012), and the sealing part (4042) is located on the outer periphery of the outlet (1012) with rounded corners.

2. The pneumatic cleaning valve for a silo according to claim 1, characterized in that: The outer peripheral surface of the sealing part (4042) extends horizontally outward to form a diversion disc (405) that abuts against the outer end face of the air outlet (1012) of the valve body (1); a cylindrical closed arc plate (406) is provided on the outer peripheral surface of the connecting part (4041), and a directional blowing notch is formed between the two ends of the cylindrical closed arc plate (406).

3. The pneumatic cleaning valve for a silo according to claim 1, characterized in that: A spring guide tube (402) is sleeved on the outer periphery of the end of the valve stem (4) facing the air inlet (1011). A return spring (5) is sleeved on the spring guide tube (402). An airflow distribution block (403) is fixed on the end of the spring guide tube (402) away from the air inlet (1011). The airflow distribution block (403) abuts against the gas passage (101) of the valve body (1). Multiple arc-shaped diversion holes (4031) are evenly distributed on the outer periphery of the airflow distribution block (403). One end of the return spring (5) abuts against the airflow distribution block (403), and the other end is connected to the spring clamping block (401) fixed on the valve stem (4).

4. A pneumatic cleaning valve for a silo according to claim 3, characterized in that: The gas pipeline inside the valve body (1) is a three-section Venturi structure. The diameter of the gas passage (101) is divided into a first section (1013), a second section (1014), and a third section (1015) from the inlet (1011) to the outlet (1012). A circular step is formed at the connection between the first section (1013), the second section (1014), and the third section (1015). The airflow distribution block (403) abuts against the circular step of the first section (1013).

5. A pneumatic cleaning valve for a silo according to claim 3, characterized in that: The number of flow distribution holes (4031) on the airflow distribution block (403) is 2-4.

6. A pneumatic cleaning valve for a silo according to claim 5, characterized in that: The airflow distribution block (403) has three flow divider holes (4031).

7. A pneumatic cleaning valve for a silo according to claim 6, characterized in that: The structure of the spring clamping block (401) is the same as that of the airflow distribution block (403), and the diversion hole (4031) on the airflow distribution block (403) is connected to the diversion hole (4031) on the spring clamping block (401).

8. A pneumatic cleaning valve for a silo according to claim 1, characterized in that: One end of the air inlet (1011) of the valve body (1) is connected to a pulse connection pipe (2) for connecting to the pulse valve (6).

9. A pneumatic cleaning system for a silo, comprising a compressor (8) and a plurality of pulse valves (6), wherein the compressor (8) is connected to each pulse valve (6) via connecting pipes (8), characterized in that: Each pulse valve (6) is connected to a pneumatic cleaning valve for a silo as described in any of claims 1-8, and multiple pneumatic cleaning valves are installed at intervals in the conical section of the silo.

Images