CN103511300A - Fan structure and fan wheel thereof - Google Patents

Abstract

The invention relates to a fan structure and a fan wheel thereof. The fan structure at least comprises a sleeve, a fan wheel, a bearing and a fixed shaft lever, wherein the sleeve is provided with a barrel body, an accommodating space and a bottom, the fan wheel is provided with a hub and a combination seat, the combination seat is provided with a ring wall and an accommodating groove, the bearing is combined with the accommodating groove, the fixed shaft lever penetrates through a shaft hole of the bearing, the ring wall of the combination seat is provided with a guide through hole, the guide through hole exposes the fixed shaft lever, the guide through hole is communicated with the accommodating space and the accommodating groove, and lubricating oil is guided to gather in the accommodating space of the sleeve by the guide through hole so as to avoid loss of the lubricating oil caused by rotation of the fan wheel. The invention also provides a fan wheel of the fan structure.

Description

Fan structure and fan wheel

technical field

The invention relates to a fan structure, in particular to a fan wheel with a guide channel to guide lubricating oil back to the bearing.

Background technique

Please refer to FIG. 13, which is a sectional view of a conventional conventional fan structure. A conventional fan structure 10 includes a bottom plate 11, a sleeve 12, a stator 13, a bearing 14, a shaft 15, a hub 16 and a plurality of fan blades 17, the sleeve 12 is arranged on the bottom plate 11, the The stator 13 is combined with the sleeve 12 to drive the shaft 15 , the hub 16 and the blades 17 to rotate. However, when the shaft 15 rotates, the lubricating oil lubricating the bearing 14 and the shaft 15 will splash out of the sleeve 12 due to centrifugal force and cause the loss of lubricating oil, so the friction between the shaft 15 and the bearing 14 increases , thus shortening the service life of the fan structure 10.

This shows that the above-mentioned existing fan structure obviously still has inconvenience and defects in structure and use, and needs to be further improved urgently. In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but for a long time no suitable design has been developed, and the general products do not have a suitable structure to solve the above-mentioned problems. This is obviously related. The problem that the industry is eager to solve. Therefore, how to create a new type of fan structure and its fan wheel is one of the current important research and development topics, and has also become a goal that the industry needs to improve.

Contents of the invention

The main purpose of the present invention is to overcome the defects of the existing fan structure and provide a novel fan structure and its fan wheel. The technical problem to be solved is to guide and lubricate it through the guide through hole of the fan wheel. The oil is collected in the accommodation space of the sleeve to avoid the loss of lubricating oil due to the rotation of the fan wheel, which is very suitable for practical use.

The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. According to a fan structure proposed by the present invention, it includes a sleeve, a fan wheel, a bearing and a fixed shaft. The sleeve has a cylinder and an accommodation space. The cylinder surrounds the accommodation space. The fan wheel has a hub and Combining seat, the combining seat has a ring wall and a receiving groove, the ring wall is combined with the hub, and the ring wall surrounds the receiving groove, the ring wall has a guiding through hole, and the ring wall is accommodated in the sleeve The accommodating space of the sleeve, the guide through hole communicates with the accommodating space of the sleeve and the accommodating groove of the combination seat, the bearing is combined with the accommodating groove of the combination seat, the bearing has a shaft hole, the The fixed shaft is passed through the shaft hole, and the guide through hole of the ring wall exposes the fixed shaft. When the fan wheel rotates, the lubricating oil will rise up along the ring wall of the joint seat or the fixed shaft, and due to the influence of centrifugal force, the lubricating oil will accumulate in the guide hole through the ring wall The accommodating space of the sleeve is to avoid splashing and loss of lubricating oil due to the rotation of the fan wheel.

The purpose of the present invention and its technical problems can also be further realized by adopting the following technical measures.

In the aforementioned fan structure, the surrounding wall has a top surface and a bottom surface, and the guiding through hole is located between the top surface and the bottom surface.

In the aforementioned fan structure, the said guiding through hole is recessed on the bottom surface.

In the aforementioned fan structure, the above-mentioned guiding through hole is recessed on the top surface.

In the aforementioned fan structure, the bearing has a through hole, the through hole exposes the fixed shaft, and the through hole communicates with the guide through hole and the shaft hole of the ring wall.

In the aforementioned fan structure, the through hole of the bearing and the guide through hole of the ring wall form a guide channel.

The aforementioned fan structure, wherein the bearing further has an outer ring wall, the outer ring wall is in a stepped shape, the outer ring wall has a first surface and a second surface, and a gap is formed between the first surface and the ring wall. An oil storage space, the oil storage space communicates with the through hole of the bearing and the guide through hole of the ring wall.

In the aforementioned fan structure, the cylinder body of the sleeve has a top edge, the guide through hole of the ring wall has an upper hole wall, and the upper hole wall is lower than the top edge.

In the aforementioned fan structure, the cylinder body of the sleeve has a top edge, and the guiding through hole has a lower hole wall, and the lower hole wall is lower than the top edge.

The purpose of the present invention and the solution to its technical problem also adopt the following technical solutions to achieve. A fan wheel with a fan structure according to the present invention includes: a hub; and a coupling seat, which has a ring wall and a receiving groove, the ring wall is combined with the hub, the ring wall surrounds the receiving groove, and the ring The wall has an inner wall, an outer wall and a guiding through hole, and the guiding through hole communicates with the inner wall and the outer wall.

The purpose of the present invention and its technical problems can also be further realized by adopting the following technical measures.

In the fan wheel of the aforementioned fan structure, the ring wall has a top surface and a bottom surface, and the guiding through hole is located between the top surface and the bottom surface.

In the fan wheel of the aforementioned fan structure, the guide through hole is recessed on the bottom surface.

The fan wheel of the aforementioned fan structure, wherein the guide through hole is recessed on the top surface.

The purpose of the present invention and its technical problems are solved by adopting the following technical solutions in addition. According to a fan structure proposed by the present invention, it includes: a fan wheel with a hub and a joint seat, the joint seat has a ring wall and a receiving groove, the ring wall is combined with the hub, the ring wall surrounds the receiving groove, The ring wall has an inner wall, an outer wall, and a guide through hole, and the guide through hole communicates with the inner wall and the outer wall; the bearing is combined with the accommodating groove of the joint seat, and the bearing has a shaft hole; and The shaft rod is passed through the shaft hole, and the guide through hole of the ring wall exposes the fixed shaft rod.

The purpose of the present invention and its technical problems can also be further realized by adopting the following technical measures.

In the aforementioned fan structure, the surrounding wall has a top surface and a bottom surface, and the guiding through hole is located between the top surface and the bottom surface.

In the aforementioned fan structure, the said guiding through hole is recessed on the bottom surface.

In the aforementioned fan structure, the above-mentioned guiding through hole is recessed on the top surface.

In the aforementioned fan structure, the bearing has a through hole, the through hole exposes the fixed shaft, and the through hole communicates with the guide through hole and the shaft hole of the ring wall.

In the aforementioned fan structure, the through hole of the bearing and the guide through hole of the ring wall form a guide channel.

The aforementioned fan structure, wherein the bearing further has an outer ring wall, the outer ring wall is in a stepped shape, the outer ring wall has a first surface and a second surface, and a gap is formed between the first surface and the ring wall. An oil storage space, the oil storage space communicates with the through hole of the bearing and the guide through hole of the ring wall.

Compared with the prior art, the present invention has obvious advantages and beneficial effects. By virtue of the above-mentioned technical solution, the fan structure and the fan wheel of the present invention have at least the following advantages and beneficial effects: the present invention uses centrifugal force to make the lubricating oil pass through the guide through hole of the ring wall to change the flow path of the lubricating oil, and Make the lubricating oil accumulate in the accommodating space of the sleeve through the guide through hole, so as to avoid the lubricating oil splashing out of the joint seat, hub or sleeve and causing loss, and the lubricating oil accumulates in the accommodating space of the sleeve The space can relubricate the bearing to achieve the effect of circulating lubrication.

To sum up, the present invention relates to a fan structure and fan wheel. The fan structure at least includes a sleeve, a fan wheel, a bearing and a fixed shaft. The sleeve has a cylinder, an accommodation space and a bottom. The fan wheel has a hub and a joint seat, and the joint seat has a ring wall and an accommodation groove, the bearing is combined in the accommodation groove, the fixed shaft is passed through the shaft hole of the bearing, the ring wall of the combination seat has a guide through hole, and the guide through hole exposes the fixed shaft, and the The guiding through hole communicates with the accommodating space and the accommodating groove, and through the guiding through hole, the lubricating oil is guided to gather in the accommodating space of the sleeve, so as to prevent the lubricating oil from being lost due to the rotation of the fan wheel. At the same time, the invention also provides a fan wheel with a fan structure. The present invention has significant progress in technology, and has obvious positive effects, and is a novel, progressive and practical new design.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the following preferred embodiments are specifically cited, and in conjunction with the accompanying drawings, the detailed description is as follows.

Description of drawings

FIG. 1 is an exploded perspective view of a fan structure according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the fan structure according to the first embodiment of the present invention.

Fig. 3 is a bottom perspective view of the fan wheel according to the first embodiment of the present invention.

Fig. 4 is a perspective view of the bearing according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view of the fan structure according to the second embodiment of the present invention.

6 is a top perspective view of the fan wheel according to the second embodiment of the present invention.

Fig. 7 is a bottom perspective view of the fan wheel according to the second embodiment of the present invention.

FIG. 8 is a cross-sectional view of the fan structure according to the third embodiment of the present invention.

Fig. 9 is a bottom perspective view of the fan wheel according to the third embodiment of the present invention.

Fig. 10 is a cross-sectional view of the fan structure according to the fourth embodiment of the present invention.

Fig. 11 is a perspective view of the bearing according to the fourth embodiment of the present invention.

FIG. 12 is a cross-sectional view of the fan structure according to a fifth embodiment of the present invention.

Fig. 13 is a sectional view of a conventional fan structure.

10: Fan structure 11: Bottom plate

12: Sleeve 13: Stator

14: Bearing 15: Shaft

16: Wheel hub 17: Fan blade

100: Fan structure 110: Sleeve

111: Cylinder body 112: Accommodating space

113: Bottom 114: Top edge

120: fan wheel 121: wheel hub

122: Fan blade 123: Combination seat

123a: Perforation 124: Ring Wall

124a: inner wall 124b: outer wall

125: Storage tank 126: Top surface

127: Bottom surface 128: Guide through hole

128a: Upper hole wall 128b: Lower hole wall

130: Bearing 131: Shaft hole

132: Through hole 133: Outer ring wall

133a: first surface 133b: second surface

140: fixed shaft 141: first end

142: Second end 150: Stator

160: circuit board 170: base

S: oil storage space W: guide channel

Detailed ways

In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation, structure, characteristics and features of the fan structure and its fan wheel proposed according to the present invention will be described below in conjunction with the accompanying drawings and preferred embodiments. Its effect is described in detail below.

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of preferred embodiments with reference to the drawings. Through the description of specific embodiments, it should be possible to obtain a deeper and more specific understanding of the technical means and effects of the present invention to achieve the intended purpose, but the attached drawings are only for reference and description, and are not used to explain the present invention. be restricted.

Please refer to FIG. 1 , which is an exploded perspective view of a fan structure according to a first embodiment of the present invention. The fan structure 100 of the first embodiment of the present invention includes a sleeve 110, a fan wheel 120, a bearing 130, a fixed shaft 140, a stator 150, a circuit board 160 and a base 170, and the sleeve 110 is arranged on the base 170 , the stator 150 and the circuit board 160 are assembled on the sleeve 110 to drive the fan wheel 120 to rotate.

Please refer to FIG. 2 , which is a cross-sectional view of the fan structure according to the first embodiment of the present invention. The sleeve 110 has a cylinder 111, an accommodation space 112 and a bottom 113, the cylinder 111 is combined with the bottom 113, and the cylinder 111 surrounds the accommodation space 112; please refer to FIG. 1, FIG. 2 and FIG. 3 , FIG. 3 is a bottom perspective view of the fan wheel according to the first embodiment of the present invention. The fan wheel 120 has a hub 121, a plurality of fan blades 122 combined with the hub 121 and a combination seat 123, the combination seat 123 has a ring wall 124 and a receiving groove 125, the ring wall 124 is combined with the hub 121, the ring wall 124 surrounds the accommodating groove 125, and the ring wall 124 has an inner side wall 124a, an outer side wall 124b, a top surface 126, a bottom surface 127 and a guiding through hole 128, and the guiding through hole 128 communicates with the inner side wall 124a and the outer side wall 124b , the guiding through hole 128 is located between the top surface 126 and the bottom surface 127, in this embodiment, the guiding through hole 128 can be one or more.

Please refer to FIG. 2, the ring wall 124 of the coupling seat 123 is accommodated in the accommodation space 112 of the sleeve 110, and the guiding through hole 128 communicates with the accommodation space 112 and the accommodation groove 125, In this embodiment, the guide through hole 128 is recessed on the bottom surface 127 of the ring wall 124, and the guide through hole 128 has an upper hole wall 128a, and the bearing 130 is combined with the receiving seat 123. groove 125, and the bearing 130 is located in the accommodating space 112 of the sleeve 110, the bearing 130 has a shaft hole 131, the fixed shaft 140 is passed through the shaft hole 131, and the guide of the ring wall 124 passes through The hole 128 exposes the fixed shaft 140, the fixed shaft 140 has a first end 141 and a second end 142, the first end 141 is fixed to the bottom 113 of the sleeve 110, the second end 142 passes through the joint seat The perforation 123a of 123 protrudes from the top surface 126 of the joint seat 123, and the fixed shaft 140 is not in contact with the joint seat 123, so as to avoid the friction between the fixed shaft 140 and the fan wheel 120 and affect the fan wheel 120. The wheel 120 rotates, and since the second end 142 of the fixed shaft 140 protrudes from the top surface 126 of the joint seat 123, it is possible to avoid deformed shells when the fan structure 100 is installed in electronic products. body or keyboard or improper external force, which hinders the normal operation of the fan structure 100 or causes damage to the fan structure 100 .

Please refer to FIG. 2 and FIG. 4. FIG. 4 is a perspective view of the bearing according to the first embodiment of the present invention. In this embodiment, the bearing 130 has a through hole 132, the through hole 132 communicates with the guide through hole 128 and the shaft hole 131 of the ring wall 124, and the through hole 132 exposes the fixed shaft 140, in this embodiment In an embodiment, the through hole 132 of the bearing 130 and the guiding through hole 128 of the ring wall 124 form a guiding channel W.

Please refer to FIG. 2, the barrel 111 of the sleeve 110 has a top edge 114, the upper hole wall 128a of the guide through hole 128 is lower than the top edge 114 of the barrel 111, when the fan wheel 120 When driven by the stator 150 to rotate, the lubricating oil in the bearing 130 will rise up along the fixed shaft 140 or the ring wall 124 of the joint seat 123, but due to the influence of centrifugal force, the passage of the bearing 130 will The hole 132 and the guide through hole 128 of the ring wall 124 can change the path of lubricating oil flow, preventing the lubricating oil from continuing to rise up along the fixed shaft 140 or the ring wall 124 of the joint seat 123, so that the lubricating oil It can be collected in the accommodating space 112 of the sleeve 110 through the guide passage W, so as to prevent lubricating oil from leaking from the through hole 123a of the joint seat 123 to the hub 121 and the top surface 126 of the joint seat 123, And because the upper hole wall 128 a of the guiding through hole 128 is lower than the top edge 114 of the barrel 111 , it can prevent lubricating oil from splashing to the outside of the sleeve 110 to lose or pollute the stator 150 .

Please refer to FIG. 5 , FIG. 6 and FIG. 7 . FIG. 5 is a cross-sectional view of the fan structure according to the second embodiment of the present invention. 6 is a top perspective view of the fan wheel according to the second embodiment of the present invention. Fig. 7 is a bottom perspective view of the fan wheel according to the second embodiment of the present invention. The difference between the second embodiment of the present invention and the first embodiment is that the guiding through hole 128 is recessed on the top surface 126, the guiding through hole 128 has a lower hole wall 128b, and the lower hole wall 128b is lower than the barrel The top edge 114 of the body 111, as shown in FIG. The top edge 114 can prevent lubricating oil from splashing out of the sleeve 110 due to centrifugal force and causing loss.

Please refer to FIG. 8 and FIG. 9 . FIG. 8 is a cross-sectional view of the fan structure according to the third embodiment of the present invention. Fig. 9 is a bottom perspective view of the fan wheel according to the third embodiment of the present invention. The difference between the third embodiment of the present invention and the first and second embodiments is that the guiding through hole 128 only communicates with the inner side wall 124a and the outer side wall 124b, and the guiding through hole 128 is not recessed on the top surface 126, and not recessed on the bottom surface 127, in this embodiment, the upper hole wall 128a and the lower hole wall 128b of the guide through hole 128 are lower than the top edge 114 of the cylinder 111, please refer to the figure 8, when the fan wheel 120 is driven by the stator 150 to rotate, since the upper hole wall 128a and the lower hole wall 128b of the guide through hole 128 are lower than the top edge 114 of the cylindrical body 111, Therefore, the lubricating oil can be prevented from splashing out of the sleeve 110 due to the influence of centrifugal force and causing loss.

Please refer to FIG. 10 and FIG. 11 . FIG. 10 is a cross-sectional view of the fan structure according to the fourth embodiment of the present invention. Fig. 11 is a perspective view of the bearing according to the fourth embodiment of the present invention. The difference between the fourth embodiment of the present invention and the first embodiment is that the bearing 130 additionally has an outer ring wall 133, the outer ring wall 133 is a stepped shape, and the outer ring wall 133 has a first surface 133a and a second surface 133a. Surface 133b, the outer diameter of the first surface 133a is smaller than the outer diameter of the second surface 133b, an oil storage space S is formed between the first surface 133a and the ring wall 124, and the oil storage space S communicates with the bearing 130 The through hole 132 and the guiding through hole 128 of the ring wall 124 .

Please refer to FIG. 12 , which is a cross-sectional view of the fan structure according to the fifth embodiment of the present invention. The difference between the fifth embodiment of the present invention and the first embodiment is that the bearing 130 does not form the through hole 132 in the first embodiment, and the bearing 130 of the fifth embodiment does not block the guiding passage of the ring wall 124 Hole 128, the guide channel W is the guide through hole 128 of the ring wall 124, the guide through hole 128 still reveals the fixed shaft 140, when the fan wheel 120 is driven by the stator 150 to rotate, the The lubricating oil in the bearing 130 will rise up along the fixed shaft 140 or the ring wall 124 of the joint seat 123, but due to the influence of centrifugal force, the guide through hole 128 of the ring wall 124 can change the flow of lubricating oil path to prevent the lubricating oil from continuing to rise up along the fixed shaft 140 or the ring wall 124 of the joint seat 123, so the lubricating oil can pass through the guide through hole 128 of the ring wall 124 and accumulate in the sleeve The accommodating space 112 of the cartridge 110 .

Various embodiments of the present invention use the centrifugal force to make lubricating oil pass through the guide through hole 128 of the ring wall 124 to change the flow path of the lubricating oil, and make the lubricating oil accumulate in the guide through hole 128 The accommodating space 112 of the sleeve 110 is to prevent the lubricating oil from splashing out of the joint seat 123, the hub 121 or the sleeve 110 after continuously rising upwards and causing loss, and the lubricating oil accumulates in the sleeve 110. The accommodating space 112 can relubricate the bearing 130 to achieve the effect of circulating lubrication.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, may use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but if they do not depart from the content of the technical solution of the present invention, according to the Technical Essence Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solution of the present invention.

Claims (20)

1. a fan structure, is characterized in that it comprises:

Sleeve, has cylindrical shell and containing space, and this cylindrical shell is around this containing space;

Impeller, there is wheel hub and conjunction base, this conjunction base has ringwall and containing groove, this ringwall is incorporated into this wheel hub, and this ringwall is around this containing groove, this ringwall has guiding through hole, and this ringwall is placed in this containing space of this sleeve, and this guiding through hole is communicated with this containing space of this sleeve and this containing groove of this conjunction base;

Bearing, is incorporated into this containing groove of this conjunction base, and this bearing has axis hole; And

Fixed axostyle, is arranged in this axis hole, and this guiding through hole of this ringwall appears this fixed axostyle.

2. fan structure according to claim 1, is characterized in that wherein said ringwall has end face and bottom surface, and this guiding through hole is between this end face Ji Gai bottom surface.

3. fan structure according to claim 2, is characterized in that wherein said guiding through hole is arranged with Yu Gai bottom surface.

4. fan structure according to claim 2, is characterized in that wherein said guiding through hole is arranged with in this end face.

5. fan structure according to claim 1, is characterized in that wherein said bearing has through hole, and this through hole appears this fixed axostyle, and this through hole is communicated with this guiding through hole and this axis hole of this ringwall.

6. fan structure according to claim 5, is characterized in that this through hole of wherein said bearing and this guiding through hole of this ringwall form guiding channel.

7. fan structure according to claim 5, it is characterized in that wherein said bearing separately has external annulus, this external annulus is stepped, this external annulus has first surface and second surface, between this first surface and this ringwall, be formed with oil storage space, this oil storage space is communicated with this through hole of this bearing and this guiding through hole of this ringwall.

8. fan structure according to claim 3, is characterized in that this cylindrical shell of wherein said sleeve has apical margin, and this guiding through hole of this ringwall has upper hole wall, and on this, hole wall is lower than this apical margin.

9. fan structure according to claim 4, is characterized in that this cylindrical shell of wherein said sleeve has apical margin, and this guiding through hole has lower hole wall, and this lower hole wall is lower than this apical margin.

10. an impeller for fan structure, is characterized in that it comprises:

Wheel hub; And

Conjunction base, it has ringwall and containing groove, and this ringwall is incorporated into this wheel hub, and this ringwall is around this containing groove, and this ringwall has madial wall, outer side wall and guiding through hole, and this guiding through hole is communicated with this madial wall and this outer side wall.

The impeller of 11. fan structures according to claim 10, is characterized in that wherein said ringwall has end face and bottom surface, and this guiding through hole is between this end face Ji Gai bottom surface.

The impeller of 12. fan structures according to claim 11, is characterized in that wherein said guiding through hole is arranged with Yu Gai bottom surface.

The impeller of 13. fan structures according to claim 11, is characterized in that wherein said guiding through hole is arranged with in this end face.

14. 1 kinds of fan structures, is characterized in that it comprises:

Impeller, has wheel hub and conjunction base, and this conjunction base has ringwall and containing groove, and this ringwall is incorporated into this wheel hub, and this ringwall is around this containing groove, and this ringwall has madial wall, outer side wall and guiding through hole, and this guiding through hole is communicated with this madial wall and this outer side wall;

Bearing, is incorporated into this containing groove of this conjunction base, and this bearing has axis hole; And

Fixed axostyle, is arranged in this axis hole, and this guiding through hole of this ringwall appears this fixed axostyle.

15. fan structures according to claim 14, is characterized in that wherein said ringwall has end face and bottom surface, and this guiding through hole is between this end face Ji Gai bottom surface.

16. fan structures according to claim 15, is characterized in that wherein said guiding through hole is arranged with Yu Gai bottom surface.

17. fan structures according to claim 15, is characterized in that wherein said guiding through hole is arranged with in this end face.

18. fan structures according to claim 14, is characterized in that wherein said bearing has through hole, and this through hole appears this fixed axostyle, and this through hole is communicated with this guiding through hole and this axis hole of this ringwall.

19. fan structures according to claim 18, is characterized in that this through hole of wherein said bearing and this guiding through hole of this ringwall form guiding channel.

20. fan structures according to claim 18, it is characterized in that wherein said bearing separately has external annulus, this external annulus is stepped, this external annulus has first surface and second surface, between this first surface and this ringwall, be formed with oil storage space, this oil storage space is communicated with this through hole of this bearing and this guiding through hole of this ringwall.

Images