A slag removal device for a water discharger

Abstract

The present invention relates to a slag removal device for a water discharger in the field of gas extraction technology, comprising a cylinder, a water inlet pipe, and a water outlet pipe. The lower end of the cylinder is provided with a support leg for supporting the cylinder. The upper section of the inner cavity of the cylinder is rotatably connected to a filter cartridge coaxial with the cylinder. The upper section of one side of the cylinder is provided with a water inlet pipe, which allows water flowing out of the water outlet to eccentrically impact the filter cartridge and drive the filter cartridge to rotate. The top of the cylinder is provided with an outlet pipe that can be sealed and connected to the top of the water discharger. Due to the arrangement of the cylinder, the filter cartridge, the water inlet pipe, and the water outlet pipe, the present invention can eccentrically spray the water flowing out of the water inlet pipe to the filter cartridge, thereby realizing the function of the filter cartridge filtering the water flowing out of the water inlet pipe. At the same time, the filter cartridge rotates under the action of the water flow, so that the water residue on the outside of the filter cartridge is separated from the filter cartridge under the action of centrifugal force, thereby realizing the function of automatically cleaning the filter cartridge and reducing the frequency of inspections and maintenance by staff.

Description

Technical Field

[0001] The present invention relates to the technical field of gas drainage, in particular to a slag removal device for a water drainer. Background Art

[0002] There are dense gas extraction pipelines in coal mines, and solid impurities such as coal blocks and soil or water are often produced in the extraction pipelines. In order to prevent solid impurities and water from being extracted together with gas and affecting the quality of gas, water drainers are generally installed in the gas extraction system.

[0003] However, during use, it was found that during the extraction process, after the coal slime from some boreholes flowed along the sealing pipe to the pipeline, the coal water flowed into the water discharger. Large particles easily blocked the air intake of the water discharger, causing the water discharger to lose its function and unable to automatically discharge water, resulting in water accumulation in the extraction pipeline. Therefore, it is necessary to arrange a dedicated person to inspect and repair the water discharger every day to ensure that the water discharger can work normally.

[0004] At present, the existing Chinese patent with publication number CN208161135U discloses a water slag pretreatment device for a gas extraction and slag discharger, comprising a cone, a movable disc, a box and a filter slag hopper. A screen is installed in the cone vertically fixed below the top surface, a first movable disc is installed on the outlet of one side of the upper part of the cone, a reducing pipe connected to the cone is provided at the lower part of the other side of the cone, a second movable disc is installed on the inlet of the reducing pipe, a screen inspection hole connected to the cone is installed on the cone at the upper part of the reducing pipe, a vertical first hose is installed on the lower bottom surface of the cone near the reducing pipe, and the first hose is connected to the water slag separation box through a pipe joint. The water-slag separation box is connected, and a filter slag collecting hopper with an upward mouth is installed in the water-slag separation box, and a slag removal port is provided on one side surface near the upper part of the water-slag separation box. Although this device can reduce the water slag entering the water discharger, the device still has at least one of the following shortcomings: 1. The filtered water slag is deposited in the screen and the filter slag collecting hopper, so the staff still needs to check and clean the screen and the filter slag collecting hopper regularly or irregularly every day; 2. Since the filter slag collecting hopper is located directly below the pipe joint, it is easy for the water and water slag flowing into the water-slag separation box from the pipe joint to directly impact the inner cavity of the filter slag collecting hopper, which can easily cause the water slag deposited in the filter slag collecting hopper to float and flow into the water discharger along the water flow. Summary of the Invention

[0005] The object of the present invention is to provide a slag removal device for a water discharger in order to solve the above-mentioned problems.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0007] A slag removal device for a water discharger comprises a cylinder, a water inlet pipe, and a water outlet pipe. The lower end of the cylinder is provided with a support leg for supporting the cylinder. The upper section of the cylinder inner cavity is rotatably connected to a filter cartridge coaxial therewith. The upper section of one side of the cylinder is provided with a water inlet pipe, through which water flowing out of the water outlet can eccentrically impact the filter cartridge and drive the filter cartridge to rotate. The top of the cylinder is provided with an air outlet pipe that can be sealed and connected to the top of the water discharger. The center of the bottom of the cylinder is provided with a slag discharge structure for discharging slag.

[0008] The lower end surface of the filter cartridge is provided with a coaxial horizontal circular plate, the outer edge of the horizontal circular plate is provided with a downwardly inclined skirt, and there is a gap between the outer edge of the skirt and the inner wall of the cartridge, and the lower plate surface of the horizontal circular plate is provided with a plurality of vertical arc-shaped baffles at even intervals along its circumference, and the center of the cross section of the arc-shaped baffle is located on the central axis of the filter cartridge;

[0009] An annular plate is provided on the inner wall of the cylinder at a position corresponding to the position above the skirt, and the outer contour of the annular plate is an inverted frustum structure, and the taper of the frustum structure is 10-30 degrees; a plurality of spoilers are provided on the inner wall of the cylinder at a position corresponding to the position below the skirt, and are evenly spaced along the circumference of the inner wall of the cylinder;

[0010] The outlet pipe is L-shaped, the vertical section of the outlet pipe is coaxial with the filter cartridge, and the upper end of the vertical section of the outlet pipe is located at a height corresponding to the position between the bottom of the filter cartridge and the water outlet of the water inlet pipe, the horizontal section of the outlet pipe is located below the arc-shaped baffle, and the outer end of the horizontal section of the outlet pipe is sealed and extends out of the cylinder body;

[0011] The slag discharge structure includes a three-way slag discharge pipe, one end of which is sealed and connected to the middle of the bottom of the cylinder, and the other two ends of the slag discharge pipe are respectively provided with a manual valve and an electric valve;

[0012] The system also includes a rotation sensor for detecting whether the filter cartridge is in a rotating state, and the rotation sensor is connected to the electric valve signal.

[0013] Preferably, the cylinder body includes a cylinder bottom, a cylinder body, and a cylinder cover. The bottom of the cylinder body is sealed and connected to the cylinder bottom with a conical structure. The top of the cylinder body is detachably and sealedly connected to the cylinder cover, and the filter cartridge is rotatably connected to the middle of the lower cover surface of the cylinder cover.

[0014] Preferably, the outer edge of the top of the cylinder body is sealed with a flange coaxial therewith, the cylinder cover is detachably connected to the flange via bolts, and a sealing gasket is provided between the flange and the lower cover surface of the cylinder cover.

[0015] Preferably, the lower cover surface of the cartridge cover is provided with a convex ring coaxial therewith, the convex ring body is connected to a mounting sleeve coaxial therewith via a bearing, and the bottom of the mounting sleeve is coaxially fixedly connected to the upper end of the filter cartridge.

[0016] Preferably, it also includes an air pressure sensor for detecting the air pressure at the upper end of the inner cavity of the cylinder, and the air pressure sensor is connected to the electric valve signal.

[0017] Preferably, the central axis of the water inlet pipe intersects with the cross-sectional contour circle of the filter cartridge, and the central axis of the water inlet pipe deviates from the center of the cross-sectional contour circle of the filter cartridge.

[0018] Preferably, the inner wall of the filter cartridge is provided with a plurality of water baffles evenly spaced along its circumference and arranged along its radial direction.

[0019] The beneficial effects are:

[0020] 1. Due to the arrangement of the cylinder, filter cartridge, water inlet pipe and water outlet pipe, the water flowing out of the water inlet pipe can be eccentrically sprayed onto the filter cartridge, thereby realizing the filter cartridge's function of filtering the water flowing out of the water inlet pipe. At the same time, the filter cartridge rotates under the action of the water flow, so that the water residue on the outside of the filter cartridge is separated from the filter cartridge under the action of centrifugal force, thereby realizing the function of automatic cleaning of the filter cartridge and reducing the frequency of inspection and maintenance by staff;

[0021] 2. Due to the arrangement of the horizontal circular plate and the arc-shaped baffle, when there is a lot of slag in the cylinder, the slag contacts the arc-shaped baffle, resulting in obstruction of the circular motion of the arc-shaped baffle, and thus obstruction of the rotation of the filter cartridge. At this time, when the rotation sensor detects the signal, the electric valve automatically opens. When the rotation of the filter cartridge resumes, the electric valve automatically closes, realizing the function of automatic slag discharge. At the same time, the arc-shaped baffle can slow down or prevent the movement of the slag under the action of the slag, while also reducing the churning of the slag as much as possible. Even if a small amount of churning occurs, the labyrinth structure composed of the horizontal circular plate, the skirt and the annular enclosure can reduce the churning slag back to the top of the horizontal circular plate, thereby ensuring that the water above the horizontal circular plate, especially inside the filter cartridge, is clear, and the water entering the outlet pipe is relatively clean.

[0022] 3. Due to the setting of the spoiler, the flow of water under the horizontal circular plate can be reduced, thereby preventing the slag from flowing back upward under the action of centrifugal force, further ensuring that the water entering the outlet pipe is relatively clean.

[0023] Additional technical features and advantages of the present invention will be more clearly explained in the following description, or can be understood through specific practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 is a top view of the present invention;

[0027] Figure 3 yes Figure 2 AA cross-sectional view;

[0028] Figure 4 yes Figure 2 BB cross-sectional view;

[0029] Figure 5 yes Figure 3 I local enlarged view;

[0030] Figure 6 It is a structural schematic diagram of the filter cartridge in the present invention;

[0031] Figure 7 It is a structural schematic diagram of the filter cartridge in the present invention from another perspective;

[0032] Figure 8 It is another structural schematic diagram of the present invention;

[0033] Figure 9 It is a schematic diagram of the assembly structure of the present invention and the water discharger.

[0034] The following are the descriptions of the reference numerals:

[0035] 1. Cylinder body; 101. Annular enclosure; 102. Spoiler; 11. Cylinder bottom; 12. Cylinder body; 121. Flange; 122. Sealing gasket; 13. Cylinder cover; 131. Raised ring; 132. Mounting sleeve; 2. Filter cartridge; 21. Horizontal circular plate; 211. Skirt; 22. Arc-shaped baffle; 23. Water baffle; 3. Water inlet pipe; 4. Water outlet pipe; 5. Air outlet pipe; 6. Slag discharge structure; 61. Three-way slag discharge pipe; 62. Manual valve; 63. Electric valve; 7. Support leg; 8. Rotation sensor; 9. Air pressure sensor. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0038] Example 1, as Figure 1-9 As shown, a slag removal device for a water discharger comprises a cylinder 1, a water inlet pipe 3, and a water outlet pipe 4. The lower end of the cylinder 1 is provided with a support leg 7 for supporting it. The upper section of the inner cavity of the cylinder 1 is rotatably connected to a filter cartridge 2 coaxial therewith. The upper section of one side of the cylinder 1 is provided with a water inlet pipe 3, which allows water flowing out of the water outlet to eccentrically impact the filter cartridge 2 and drive the filter cartridge 2 to rotate; the top of the cylinder 1 is provided with an air outlet pipe 5 that can be sealed and connected to the top of the water discharger; and a slag discharge structure 6 for discharging slag is provided in the center of the bottom of the cylinder 1.

[0039] As needed, the central axis of the water inlet pipe 3 intersects with the cross-sectional contour circle of the filter cartridge 2, and the central axis of the water inlet pipe 3 deviates from the center of the cross-sectional contour circle of the filter cartridge 2; that is, the water column flowing out of the water outlet of the water inlet pipe 3 can be eccentrically sprayed toward the body of the filter cartridge 2, so that the filter cartridge 2 can rotate under the impact of the water column, and at the same time, part of the water column can enter the interior of the filter cartridge 2 without affecting the filtration of water by the filter cartridge 2;

[0040] As needed, the inner wall of the filter cartridge 2 is evenly spaced along its circumference and provided with a plurality of radially arranged water baffles 23, which can speed up the rotation efficiency of the filter cartridge 2;

[0041] As needed, the outer wall of the filter cartridge 2 can be provided with a plurality of wing plates evenly spaced along its circumference, and a certain angle is formed between the wing plates and the radial direction of the filter cartridge 2, and the angle is 30-40 degrees. Due to the existence of this angle, water impacting the wing plate surface can be urged to flow into the interior of the filter cartridge 2, which can also better enable the filter cartridge 2 to rotate;

[0042] A coaxial horizontal circular plate 21 is provided on the lower end surface of the filter cartridge 2. A downwardly inclined skirt 211 is provided on the outer edge of the horizontal circular plate 21, and a gap exists between the outer edge of the skirt 211 and the inner wall of the cylinder 1. A plurality of vertical arc-shaped baffles 22 are evenly spaced along the circumference of the lower plate surface of the horizontal circular plate 21, and the center of the cross section of the arc-shaped baffle 22 is located on the central axis of the filter cartridge 2.

[0043] An annular enclosure 101 is provided on the inner wall of the cylinder 1 at a position corresponding to the position above the skirt 211, and the outer profile of the annular enclosure 101 is an inverted frustum structure, and the taper of the frustum structure is 10-30 degrees; according to needs, in actual use, the taper of the frustum structure is best between 18-22 degrees, preferably, the taper of the frustum structure is 19 degrees, 20 degrees or 20.5 degrees; a plurality of spoilers 102 are evenly spaced along the circumference of the inner wall of the cylinder 1 at a position corresponding to the position below the skirt 211;

[0044] The outlet pipe 4 is L-shaped, and the vertical section of the outlet pipe 4 is coaxially arranged with the filter cartridge 2. The upper end of the vertical section of the outlet pipe 4 is located at a height corresponding to the height between the bottom of the filter cartridge 2 and the water outlet of the water inlet pipe 3. The horizontal section of the outlet pipe 4 is located below the arc-shaped baffle 22, and the outer end of the horizontal section of the outlet pipe 4 is sealed and extends out of the cylinder 1.

[0045] The slag discharge structure 6 includes a three-way slag discharge pipe 61, one end of which is sealed and connected to the middle of the cylinder bottom 11, and the other two ends of the slag discharge pipe 61 are respectively provided with a manual valve 62 and an electric valve 63;

[0046] As needed, a timing device or a time relay can be provided so that the electric valve 63 can be opened for slag discharge at a specific time every day. The time relay can be set so that the control device controls the electric valve 63 to close after the electric valve 63 is opened for a certain period of time.

[0047] The manual valve 62 can play the role of forced slag discharge, and can prevent the phenomenon of slag discharge failure caused by the electric valve 63 or the circuit related to the electric valve 63;

[0048] It also includes a rotation sensor 8 for detecting whether the filter cartridge 2 is in a rotating state, and the rotation sensor 8 is connected to the electric valve 63 by signal;

[0049] Due to the arrangement of the cylinder 1, the filter cartridge 2, the water inlet pipe 3 and the water outlet pipe 4, the water flowing out of the water inlet pipe 3 can be eccentrically sprayed toward the filter cartridge 2, thereby realizing the function of the filter cartridge 2 to filter the water flowing out of the water inlet pipe 3. At the same time, the filter cartridge 2 rotates under the action of the water flow, so that the water residue on the outside of the filter cartridge 2 is separated from the filter cartridge 2 under the action of centrifugal force, thereby realizing the function of automatically cleaning the filter cartridge 2, reducing the frequency of inspection and maintenance by staff;

[0050] Due to the arrangement of the horizontal circular plate 21 and the arc-shaped baffle 22, when there is a lot of slag in the cylinder body 1, the slag contacts the arc-shaped baffle 22, resulting in the obstruction of the circular motion of the arc-shaped baffle 22, thereby obstructing the rotation of the filter cartridge 2. At this time, when the rotation sensor 8 detects the signal, the electric valve 63 is automatically opened. When the rotation of the filter cartridge 2 resumes, the electric valve 63 is automatically closed, realizing the function of automatic slag discharge. At the same time, the arc-shaped baffle 22 can slow down or make it unable to move under the action of the slag, while also reducing the churning of the slag as much as possible. Even if a small amount of churning occurs, the labyrinth structure composed of the horizontal circular plate 21, the skirt 211 and the annular enclosure 101 can also reduce the churning slag back to the top of the horizontal circular plate 21, thereby ensuring that the water above the horizontal circular plate 21, especially the water inside the filter cartridge 2, is clear.

[0051] Due to the provision of the spoiler 102, the flow of water below the horizontal circular plate 21 can be reduced, thereby preventing the slag from flowing back upwards under the action of centrifugal force.

[0052] Example 2, based on Example 1, Figure 3-4As shown, the cylinder 1 includes a cylinder bottom 11, a cylinder body 12, and a cylinder cover 13. The bottom of the cylinder body 12 is sealed and connected to the cylinder bottom 11 with a conical structure. The top of the cylinder body 12 is detachably and sealedly connected to the cylinder cover 13, and the middle part of the lower cover surface of the cylinder cover 13 is rotatably connected to the filter cartridge 2.

[0053] This arrangement allows the filter cartridge 2 and the inner wall of the cylinder body 1 to be thoroughly cleaned by removing the cylinder cover 13.

[0054] As needed, such as Figure 3-4 As shown, in order to achieve a detachable sealed connection between the cylinder body 12 and the cylinder cover 13, a flange 121 coaxial with the cylinder body 12 is sealed and connected to the outer edge of the top of the cylinder body 12. The cylinder cover 13 is detachably connected to the flange 121 by bolts, and a sealing gasket 122 is provided between the flange 121 and the lower cover surface of the cylinder cover 13.

[0055] As needed, such as Figure 3-4 As shown, the connection relationship between the cylinder bottom 11 and the cylinder body 12 can also be set to the same structure as the connection structure between the cylinder body 12 and the cylinder cover 13;

[0056] As needed, such as Figure 8 As shown, the cylinder bottom 11 and the cylinder body 12 can be completed by seamless welding.

[0057] Example 3, based on Example 2, Figure 3-5 As shown, in order to realize the rotation function of the filter cartridge 2, the lower cover surface of the cartridge cover 13 is provided with a coaxial convex ring 131, and the convex ring 131 is connected to a coaxial mounting sleeve 132 through a bearing, and the bottom of the mounting sleeve 132 is coaxially fixed to the upper end of the filter cartridge 2.

[0058] Example 4, based on Example 1, Figure 5 As shown, it also includes an air pressure sensor 9 for detecting the air pressure at the upper end of the inner cavity of the cylinder 1, and the air pressure sensor 9 is connected to the electric valve 63 by signal;

[0059] This arrangement adopts the setting of the air pressure sensor 9. When the air pressure in the cylinder 1 detected by the air pressure sensor 9 rises sharply, it means that the slag in the cylinder 1 is completely discharged, and the outside air enters the cylinder 1 through the three-way slag discharge pipe 61. At this time, the electric valve 63 is closed to prevent a large amount of air from entering the cylinder 1 and affecting the quality of the gas.

[0060] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A slag removal device for a water discharger, comprising a cylinder (1), a water inlet pipe (3), and a water outlet pipe (4); a support leg (7) for supporting the cylinder (1) is provided at the lower end thereof; a filter cartridge (2) coaxial with the cylinder (1) is rotatably connected to the upper section of the inner cavity of the cylinder (1); a water inlet pipe (3) is provided on one side of the upper section of the cylinder (1) so that water flowing out of the water outlet can eccentrically impact the filter cartridge (2) and drive the filter cartridge (2) to rotate; an air outlet pipe (5) is provided at the top of the cylinder (1) and can be sealed and connected to the top of the water discharger; a slag discharge structure (6) for discharging slag is provided at the center of the bottom of the cylinder (1); and the characteristics are: The lower end surface of the filter cartridge (2) is provided with a coaxial horizontal circular plate (21), the outer edge of the horizontal circular plate (21) is provided with a downwardly inclined skirt (211), and a gap exists between the outer edge of the skirt (211) and the inner wall of the cylinder (1); The lower plate surface of the horizontal circular plate (21) is provided with a plurality of vertical arc-shaped baffles (22) at even intervals along its circumference, and the center of the cross section of the arc-shaped baffle (22) is located on the central axis of the filter cartridge (2); An annular panel (101) is provided on the inner wall of the cylinder (1) at a position corresponding to the position above the skirt (211), and the outer contour of the annular panel (101) is an inverted frustum structure, and the taper of the frustum structure is 10-30 degrees; The inner wall of the cylinder (1) is provided with a plurality of spoilers (102) at evenly spaced intervals along the circumference of the inner wall of the cylinder (1), corresponding to positions below the skirt (211); The outlet pipe (4) is L-shaped, the vertical section of the outlet pipe (4) is coaxially arranged with the filter cartridge (2), and the upper end of the vertical section of the outlet pipe (4) is located at a height corresponding to that between the bottom of the filter cartridge (2) and the water outlet of the water inlet pipe (3), the horizontal section of the outlet pipe (4) is located corresponding to the bottom of the arc-shaped baffle (22), and the outer end of the horizontal section of the outlet pipe (4) is sealed and extends out of the cylinder (1); The slag discharge structure (6) comprises a three-way slag discharge pipe (61), one end of the three-way slag discharge pipe (61) is sealed and connected to the middle of the cylinder bottom (11), and the other two ends of the three-way slag discharge pipe (61) are respectively provided with a manual valve (62) and an electric valve (63); It also includes a rotation sensor (8) for detecting whether the filter cartridge (2) is in a rotating state, and the rotation sensor (8) is connected to the electric valve (63) for signal transmission; When there is a large amount of slag in the cylinder (1), the slag contacts the arc-shaped baffle (22), causing the circular motion of the arc-shaped baffle (22) to be blocked, thereby causing the rotation of the filter cartridge (2) to be blocked. The rotation sensor (8) detects a signal and controls the electric valve (63) to open for slag discharge; when the rotation of the filter cartridge (2) resumes, the electric valve (63) closes.

2. A slag removal device for a water discharger according to claim 1, characterized in that: The cylinder (1) comprises a cylinder bottom (11), a cylinder body (12), and a cylinder cover (13); the bottom of the cylinder body (12) is sealedly connected to the cylinder bottom (11) with a conical structure; the top of the cylinder body (12) is detachably sealedly connected to the cylinder cover (13); and the filter cylinder (2) is rotatably connected to the middle of the lower cover surface of the cylinder cover (13).

3. A slag removal device for a water discharger according to claim 2, characterized in that: The outer edge of the top of the cylinder body (12) is sealed with a flange (121) coaxial therewith, and the cylinder cover (13) is detachably connected to the flange (121) via bolts, and a sealing gasket (122) is provided between the flange (121) and the lower cover surface of the cylinder cover (13).

4. A slag removal device for a water discharger according to claim 2, characterized in that: The lower cover surface of the cartridge cover (13) is provided with a coaxial convex ring (131), the body of the convex ring (131) is connected to a coaxial mounting sleeve (132) via a bearing, and the bottom of the mounting sleeve (132) is coaxially fixedly connected to the upper end of the filter cartridge (2).

5. The slag removal device for a water discharger according to claim 1, characterized in that: It also includes an air pressure sensor (9) for detecting the air pressure at the upper end of the inner cavity of the cylinder (1), and the air pressure sensor (9) is connected to the electric valve (63) for signal transmission.

6. The slag removal device for a water discharger according to claim 1, characterized in that: The central axis of the water inlet pipe (3) intersects with the cross-sectional contour circle of the filter cartridge (2), and the central axis of the water inlet pipe (3) deviates from the center of the cross-sectional contour circle of the filter cartridge (2).

7. The slag removal device for a water discharger according to claim 1, characterized in that: The inner wall of the filter cartridge (2) is provided with a plurality of water baffles (23) arranged along its radial direction at even intervals along its circumference.

Images