A pilot valve structure

Abstract

The present application relates to the technical field of pneumatic dust conveying, and particularly relates to a pilot valve structure. The pilot valve structure comprises a valve body, a valve core structure and a valve core channel. The valve core channel is arranged in the air inlet section of the valve body. One end of the valve core channel is arranged in the air inlet end of the valve core structure. A filter ring for filtering dust is arranged between the valve core structure and the valve core channel. A main valve for closing the valve body channel is slidably arranged in the valve body. A control mechanism is arranged between the main valve and the filter ring. The opening and closing of the main valve can control the rotation of the filter ring to change the dust accumulation circumferential position. The left and right dust accumulation positions of the filter ring can be changed by the arrangement of the sliding ring, so that the dust is orderly dispersed and accumulated.

Description

Technical Field

[0001] This invention relates to the field of pneumatic ash conveying technology. Specifically, it relates to a pilot valve structure. Background Technology

[0002] A pilot valve is a commonly used fluid control component, primarily used to control the flow and cut-off of fluid within a pipeline. Modern pilot valves typically contain a main valve core and a pilot valve core. By opening or cutting off the pilot flow path with the pilot valve core, the pressure difference within the pilot valve can be controlled, allowing the fluid pressure to drive the main valve core.

[0003] Pilot valves are frequently used in pneumatic ash conveying pipelines. To prevent dust from entering the valve core along the valve core channel and causing damage, a corresponding filter ring needs to be installed in the pilot valve core channel. In the ash conveying environment, dust will accumulate on the filter ring, and the accumulation location is concentrated at the contact point with the filter ring. Repeatedly closing and opening the channel will cause the dust to accumulate more and more, and its concentration location remains unchanged, which can easily cause blockage of the valve core channel or difficulty in gas flow. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to provide a pilot valve structure, which can control the rotation of the filter ring to change the circumferential position of the dust accumulation by opening and closing the main valve, and can change the left and right dust accumulation positions of the filter ring by setting the sliding ring, so that the dust is dispersed and accumulated in an orderly manner.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] The valve includes a valve body, a valve core structure, and a valve core channel. The valve body has an air inlet section with a valve core channel. One end of the valve core channel extends to the air inlet end of the valve core structure. A filter ring for filtering dust is provided between the valve core structure and the valve core channel. A main valve for closing the valve body channel is slidably provided inside the valve body. A control mechanism is provided between the main valve and the filter ring.

[0007] The control mechanism includes:

[0008] A through strip is slidably disposed inside the valve body, with one end of the through strip attached to the top of the main valve body and the other end of the through strip extending to the mounting end of the filter ring;

[0009] A sliding ring is slidably disposed on the outer surface of a filter ring, and a sliding cavity is provided inside the sliding ring;

[0010] A sliding frame, one end of which is slidably disposed inside a sliding cavity, and the other end of which is fitted with a through strip.

[0011] The technical solution of the present invention achieves the following beneficial technical effects:

[0012] By opening and closing the main valve, the rotation of the filter ring can be controlled to change the circumferential position of the dust accumulation. The setting of the sliding ring can change the left and right dust accumulation positions of the filter ring, so that the dust can be dispersed and accumulated in an orderly manner. Attached Figure Description

[0013] Figure 1 Schematic diagram of the cross-sectional structure of the valve body of the present invention;

[0014] Figure 2 A partial cross-sectional structural diagram of the valve body of the present invention;

[0015] Figure 3 This invention Figure 1 Enlarged structural diagram at point A in the middle;

[0016] Figure 4 Schematic diagram of the filter ring structure of this invention;

[0017] Figure 5 A schematic diagram of the cross-sectional structure of the sliding ring of this invention.

[0018] The reference numerals in the figure are as follows: 1. Valve body; 2. Valve core channel; 3. Valve core structure; 4. Filter ring; 5. Main valve; 6. Through strip; 7. Sliding ring; 8. Sliding cavity; 9. Sliding frame; 10. Hinge block; 11. Rotating tube; 12. Arc strip; 13. Extrusion strip; 14. Positioning block; 15. Limiting ring; 16. Positioning ring; 17. Return spring; 18. Extrusion surface; 19. Fitting spring; 20. Nut. Detailed Implementation

[0019] This implementation example is attached to the instruction manual. Figure 1 As shown, the instruction manual is attached. Figure 1 The structure of valve body 1 is shown. It should be noted that this solution does not improve upon the basic principle of existing pilot valves. Since this pilot valve is used in ash conveying applications, this solution provides a brief description of its basic principle. The pilot valve is shown in the attached instruction manual. Figure 1 As shown, a channel is provided inside the valve body 1. Gas and dust on the channel enter the valve body 1 from the left side along the direction of the solid arrow. After being blocked in the middle of the valve body 1, they reach the lower middle part of the valve body 1. Because a main valve 5 is slidably installed inside the valve body 1, the main valve 5 closes the upward flow channel, so the gas cannot flow along the upper middle part. Thus, some gas enters the valve core channel 2 and reaches the valve core structure 3, as shown in the attached instruction manual. Figure 1As indicated by the dashed arrow, the gas entering the valve core channel 2 acts as a trigger condition, and the main valve 5 is opened under the operation of the pilot valve. The gas flows upward along the middle and is finally delivered along the right side. This is the basic principle of the pilot valve. Since this solution does not improve the principle of the pilot valve, this solution only shows the valve core structure 3 without making any improvements to the valve core structure 3. The filter screen can filter the gas entering the valve core structure 3.

[0020] As per the instruction manual Figure 2-4 As shown, since the filter ring 4 is designed on the valve core channel 2, dust will accumulate on the filter ring 4 in a dust conveying environment. The accumulation will be concentrated at the point of contact with the filter ring 4, as indicated in the instruction manual. Figure 1 Below the filter screen, repeated closing and opening of the channel will cause dust to accumulate more and more, and its concentration position remains unchanged, which can easily cause blockage of valve core channel 2 or difficulty in gas flow. In order to solve the above problems, a circular space is provided for filter ring 4 during installation, and a threaded nut is provided on the left side off the valve body 1. This completes the installation of filter ring 4, so that filter ring 4 will not move laterally, but it is given a space to rotate, so that the filter screen can rotate stably within the space.

[0021] An arc-shaped strip 12 is integrally formed at one end of the filter ring 4 near the through strip 6, and there are multiple arc-shaped strips 12. The arc-shaped strip 12 extends in a spiral arc shape, as shown in the instruction manual. Figure 4 As shown, multiple arc-shaped strips 12 follow the instructions attached. Figure 4 The vertical center is arranged in a circular array, and the adjacent arc-shaped strips 12 have a certain gap, as shown in the instruction manual. Figure 4 From the perspective of the tube, one of the arc strips 12 is marked as arc strip N, and the markings are made clockwise. The next arc strip 12 is marked as arc strip N+1. The area above arc strip N and the area below arc strip N+1 overlaps vertically. This ensures that the action of the rotating tube 11 on it is a complete action, and it can rotate in an orderly manner around one direction.

[0022] As per the instruction manual Figure 2 As shown, as the through strip 6 of this design slides to the left, the rotating tube 11 will contact the lower arc-shaped strip 12. Because the arc-shaped strip 12 has an arc-shaped guiding effect, in... Figure 2 The hinge block 10 is hinged to one side of the through bar 6 and cannot rotate clockwise because it is blocked by the through bar 6. As the through bar 6 moves laterally, the rotating tube 11 comes into contact with the filter screen, which eventually causes the filter screen to rotate.

[0023] As the through-bar 6 returns along its original path, the hinge block 10 can rotate counterclockwise. During this return process, the rotating tube 11 on the hinge block 10 will adhere to the side wall of the next arc-shaped bar 12. The arc-shaped bar 12 causes the hinge block 10 to rotate, thus causing the rotating tube 11 on the hinge block 10 to pass over the arc-shaped bar until the through-bar 6 returns to its original position. Under the action of the torsion spring, the hinge block 10 and the rotating tube 11 return to their original positions (see instruction manual). Figure 2 In this state, a torsion spring is installed at the hinge position of the hinge block 10, and the torsion spring can reset the hinge block 10 after rotation.

[0024] As described above, the space formed by the arc-shaped strips 12 is continuous. When the through strip 6 moves again, it will contact the top of the N+1 arc-shaped strip 12 and squeeze again. In this way, the filter ring 4 will rotate in an orderly manner in one direction, thereby adjusting the position of the filter ring 4. As the position of the filter ring 4 is adjusted, the position where the filter ring 4 and the valve core channel 2 are most likely to come into contact is changed, preventing dust from accumulating on the filter ring 4.

[0025] This implementation example is attached to the instruction manual. Figure 1-3 As shown, since the above embodiment describes the movement of the through bar 6 toward the filter ring 4 and its ability to reset, without describing the specific movement method, this embodiment describes how the through bar 6 moves. First, the through bar 6 is slidably disposed inside the valve body 1, as shown in the attached manual. Figure 1 As shown, and for sealing and sliding on the valve body 1, the through strip 6 is divided into two ends, one end near the filter ring 4 and the other end near the main valve 5, as per the instruction manual. Figure 1 Included with instruction manual Figure 3 As shown in the above embodiment, the ultimate purpose of the pilot valve is to open and close the main valve 5. This design incorporates a through-bar 6 based on the opening and closing principle of the main valve 5. In this design, the main valve 5 moves downwards when opening and closing. Other pilot valves, however, require the main valve 5 to move upwards to open. (See the attached instruction manual.) Figure 3 The design can be reversed. If the main valve 5 of the other pilot valves moves laterally to open, the through bar 6 only needs to be moved in conjunction with the main valve 5 to drive the through bar 6.

[0026] This design provides a method for the main valve 5 to move downwards to open and close the channel. Therefore, in this design, a pressing surface 18 is provided on the top of the main valve 5. The pressing surface 18 is a conical surface, and a through strip 6 is attached to the conical surface. As the main valve 5 moves downwards to open the channel, the through strip 6 moves to the left under the action of the pressing surface 18, corresponding to the process of the through strip 6 moving closer to the filter ring 4 in the above embodiment. Since a contact spring 19 is installed at the bending position of the through strip 6 (the through strip 6 is bent in the middle), the contact spring 19 is attached to the instruction manual. Figure 1In the uncompressed state, as the through bar 6 moves to the left, it squeezes the contact spring 19. After the main valve 5 resets, the contact spring 19 causes the through bar 6 to reset.

[0027] This implementation example is attached to the instruction manual. Figure 1-2 As shown, the sliding frame 9 can also move during the movement of the through strip 6. The sliding frame 9 is slidably mounted on the limiting ring 15, which is rotatably mounted on the filter ring 4. Therefore, the limiting ring 15 does not restrict the rotation of the filter ring 4. A hole is provided on the limiting ring 15, allowing the sliding frame 9 to extend through the hole to the left side of the through strip 6. This allows the sliding frame 9 to move by being squeezed during the movement of the through strip 6. A return spring 17 is provided between the limiting ring 15 and the sliding frame 9. After the sliding frame 9 moves, it can be reset by the elastic force. One end of the sliding frame 9 is slidably mounted in the sliding cavity 8. The sliding frame 9 has sliding space in the sliding cavity 8 and can slide briefly. As the sliding frame 9 slides a large distance, the sliding ring 7 will be moved by the sliding frame 9 to the part where the valve core channel 2 contacts the filter ring 4 and blocks this part. In this way, the valve core channel 2 will spray gas to the left.

[0028] Due to the inclined surfaces on both sides of the sliding ring 7, the gas ejected from the valve core channel 2 is guided to the left, changing the contact point between the gas ejected from the valve core channel 2 and the filter ring 4. This allows the filter ring 4 to contact the gas for filtration on the left side, sharing the pressure accumulated in the middle. As the sliding frame 9 continues to move to the left, and the right side of the sliding ring 7 reaches the middle of the valve core channel 2, the gas can move along the right side of the sliding ring 7 under the guidance of the right side, thus changing the contact position of the filter ring 4 to the right side.

[0029] In order to ensure the stable sliding of the sliding frame 9, an opening is provided at the position of the sliding frame 9 near the through strip 6, and a positioning block 14 is integrally provided on the inner wall of the valve core channel 2, so that the sliding frame 9 can slide stably in the lateral direction.

[0030] This implementation example is attached to the instruction manual. Figure 2 , 3 As shown in Figure 5, the above embodiment describes the effect of the sliding ring 7 sliding in this solution. The sliding ring 7 also has the effect of pushing the dust to move. Since the sliding ring 7 has two inclined surfaces, that is, sharp ends, it can squeeze the dust accumulated on the filter ring 4 when it is attached to the filter ring 4. Since the dust will enter the left and right sides of the sliding ring 7, and this solution is equipped with a positioning ring 16 and a limiting ring 15, the back and forth movement can squeeze and compact the dust, reducing the space occupied.

[0031] To improve the scraping effect, an extrusion strip 13 is hinged to the inner arc of the sliding ring 7. The extrusion strip 13 is as shown in the instruction manual. Figure 5 As shown, one side of the sliding frame 9 is annular, and a rod is integrally formed on one side of the annular ring. This rod passes through the limiting ring 15 and can slide on the positioning block 14. One end of the extrusion strip 13 contacts the sliding frame 9, and the other end contacts the filter ring 4. As the sliding frame 9 moves to the left, it corresponds to the position shown in the instruction manual. Figure 2 The middle moves to the left, so that under the pushing action of the sliding frame 9, the end of the extrusion strip 13 near the filter ring 4 will adhere to the filter screen, scraping off the dust from the filter screen. The extrusion strip 13 is symmetrically arranged on the sliding ring 7, and the center of rotation is located at the hinge position between the extrusion strip 13 and the sliding ring 7. It has a circular shaft, as shown in the instruction manual. Figure 5 As shown, when the sliding frame 9 moves to the left, it squeezes the left-side extrusion strip 13 to fit against the filter ring 4. Since the sliding frame 9 has a very short sliding space in the sliding cavity 8, it will first control the extrusion strip 13 to fit against the filter ring 7 and then drive the filter ring 7 to slide together. Conversely, when the sliding frame 9 slides to the right, the right-side extrusion strip 13 will fit against the filter screen. In the above embodiment, the filter ring 4 can rotate to change its position, so the extrusion strip 13 can contact multiple positions to scrape off the dust.

[0032] The number of extrusion strips 13 can be set to multiple, and multiple extrusion strips 13 can be distributed in a circular array on the sliding ring 7.

[0033] The valve body 1 has an air inlet section with a valve core channel 2. One end of the valve core channel 2 extends to the air inlet end of the valve core structure 3. A filter ring 4 for filtering dust is provided between the valve core structure 3 and the valve core channel 2. A main valve 5 for closing the valve body 1 channel is slidably installed inside the valve body 1. A control unit is provided between the main valve 5 and the filter ring 4. A through strip 6 is slidably installed inside the valve body 1. One end of the through strip 6 is attached to the top of the main valve 5, and the other end of the through strip 6 extends to the mounting end of the filter ring 4. A sliding ring 7 is slidably installed on the outer surface of the filter ring 4. A sliding cavity 8 is provided inside the sliding ring 7. One end of a sliding frame 9 is slidably installed inside the sliding cavity 8. The other end of the sliding frame 9 is attached to the through strip 6. A hinge block 10 is hinged to the end of the through strip 6 near the filter ring 4. A rotating tube 11 is rotatably installed on the surface of the hinge block 10. An arc-shaped strip 12 is provided to the end of the filter ring 4 near the hinge block 10. There are multiple arc-shaped strips 12. An extrusion strip 1 is attached to one side of the sliding frame 9. 3. The extrusion strip 13 is hinged to the inner arc of the sliding ring 7. The end of the extrusion strip 13 away from the sliding frame 9 contacts the filter ring 4. The sliding frame 9 has an opening on the side that is in contact with the through strip 6. A positioning block 14 is slidably mounted on the surface of the opening. The positioning block 14 is integrally mounted inside the valve core channel 2. One end of the filter ring 4 is rotatably mounted with a limit ring 15, and the other end of the filter ring 4 is integrally mounted with a positioning ring 16. The edge of the limit ring 15 has a through hole to facilitate the passage of the sliding frame 9. A return spring 17 is provided between the position ring 15 and the sliding frame 9. Both ends of the sliding ring 7 are provided with inclined surfaces. A torsion spring is installed on the edge of the hinge block 10. The rotation angle of the hinge block 10 is ninety degrees. A pressing surface 18 is provided on the top of the main valve 5. A through strip 6 is attached to the surface of the pressing surface 18. A fitting spring 19 is installed on one side of the through strip 6. A nut 20 is threadedly connected to one side of the valve body 1. A filter ring 4 is attached to one end of the nut 20. Filter holes are evenly opened on the surface of the filter ring 4.

[0034] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A pilot valve structure, comprising a valve body (1), a valve core structure (3), and a valve core channel (2), characterized in that, The valve body (1) has a valve core channel (2) in the air inlet section. One end of the valve core channel (2) extends to the air inlet end of the valve core structure (3). A filter ring (4) for filtering dust is provided between the valve core structure (3) and the valve core channel (2). A main valve (5) for closing the valve body (1) channel is slidably provided inside the valve body (1). A control mechanism is provided between the main valve (5) and the filter ring (4). The control mechanism includes: Through strip (6), the through strip (6) is slidably disposed inside the valve body (1), one end of the through strip (6) is attached to the top of the main valve (5), and the other end of the through strip (6) extends to the mounting end of the filter ring (4); Sliding ring (7), the sliding ring (7) is slidably disposed on the outer surface of filter ring (4), and a sliding cavity (8) is provided inside the sliding ring (7); A sliding frame (9) is slidably disposed inside a sliding cavity (8) at one end, and a through strip (6) is attached to the other end of the sliding frame (9).

2. The pilot valve structure according to claim 1, characterized in that, The end of the through strip (6) near the filter ring (4) is hinged to a hinge block (10), and a rotating tube (11) is rotatably provided on the surface of the hinge block (10). An arc strip (12) is provided on the end of the filter ring (4) near the hinge block (10), and there are multiple arc strips (12).

3. The pilot valve structure according to claim 1, characterized in that, An extrusion strip (13) is attached to one side of the sliding frame (9). The extrusion strip (13) is hinged to the inner arc of the sliding ring (7). The end of the extrusion strip (13) away from the sliding frame (9) contacts the filter ring (4).

4. The pilot valve structure according to claim 1, characterized in that, The sliding frame (9) has an opening on one side that fits against the through strip (6), and a positioning block (14) is slidably disposed on the surface of the opening. The positioning block (14) is integrally disposed inside the valve core channel (2).

5. The pilot valve structure according to claim 1, characterized in that, One end of the filter ring (4) is provided with a limiting ring (15) for rotation, and the other end of the filter ring (4) is provided with a positioning ring (16). The edge of the limiting ring (15) is provided with a through hole for the sliding frame (9) to pass through. A return spring (17) is provided between the limiting ring (15) and the sliding frame (9).

6. The pilot valve structure according to claim 1, characterized in that, Both ends of the sliding ring (7) are provided with inclined surfaces.

7. A pilot valve structure according to claim 2, characterized in that, The hinge block (10) is equipped with a torsion spring on its side, and the hinge block (10) has a rotation angle of ninety degrees.

8. The pilot valve structure according to claim 1, characterized in that, The top of the main valve (5) is provided with a pressing surface (18), and a through strip (6) is attached to the surface of the pressing surface (18). A spring (19) is installed on one side of the through strip (6).

9. A pilot valve structure according to claim 1, characterized in that, A nut (20) is threadedly connected to one side of the valve body (1), and a filter ring (4) is fitted to one end of the nut (20).

10. A pilot valve structure according to claim 1, characterized in that, The surface of the filter ring (4) is uniformly provided with filter holes.

Images