Sealing element for shaft

Abstract

The utility model discloses a sealing element for a shaft, and relates to the field of sealing elements. Comprising a columnar shell, the columnar shell is provided with a penetrating hole in the length direction, a shaft can penetrate through the penetrating hole, sealing assemblies are arranged on the two sides of the columnar shell respectively, and when the shaft penetrates through the columnar shell, the sealing assemblies abut against the position between the shaft and the columnar shell; a penetrating hole is formed in the inner wall of the cylindrical shell, an oil injection hole is formed in the outer wall of the cylindrical shell and communicates with the interior of the penetrating hole, lubricating grease is injected between the shaft and the inner wall of the shell through the oil injection hole when the shaft penetrates through the penetrating hole, and a cavity used for containing the lubricating grease is formed among the sealing assembly, the cylindrical shell and the shaft. And the oil injection hole is communicated with the cavity. The sealing structure has the advantage of being good in sealing performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of sealing element, especially an improved sealing element for shaft. BACKGROUND

[0002] The sealing element for shaft is generally used in fluid occasions. For example, the common fluid generating occasions such as axial flow fan. The general sealing assembly for shaft generally uses the cooperation of sealing cover (gland), O-shaped sealing ring and bearing, but the O-shaped sealing ring can only solve the sealing problem of the sealing cover, and the bearing will still have the phenomenon of air leakage, although the leakage amount is small, but it will still cause the waste of energy, therefore, how to make the sealing performance between the shaft and the shaft hole better is an urgent technical problem to be solved. SUMMARY

[0003] In order to overcome the defects of the prior art, the utility model provides a sealing element for shaft.

[0004] The utility model discloses the following technical scheme is realized: a sealing element for shaft, including the cylindrical shell, the cylindrical shell is along its length direction and is set up for the shaft to pass through the perforation, the both sides of the cylindrical shell are equipped with sealing assembly respectively, when the shaft passes through the cylindrical shell, the sealing assembly is tight respectively between the shaft and the cylindrical shell,

[0005] The outer wall of the cylindrical shell is equipped with the oil injection hole, and the oil injection hole is communicated with the inside of the perforation. When the shaft passes through the perforation, the oil injection hole is used to add lubricating grease between the shaft and the inner wall of the shell. The sealing assembly, the cylindrical shell and the shaft form a cavity for accommodating lubricating grease, and the oil injection hole is communicated with the cavity.

[0006] The inner wall of the cylindrical shell is equipped with a containing groove along the circumferential direction of the cylindrical shell. The sealing assembly is placed in the containing groove. The sealing assembly is a skeleton sealing ring. The outer end face of the skeleton sealing ring abuts in the containing groove. One side of the skeleton sealing ring abuts tightly at the gap between the containing groove and the shaft.

[0007] The cross section of the containing groove is L-shaped. The end face edge of the skeleton sealing ring forms an extension strip extending outward. When the skeleton sealing ring abuts in the containing groove, the extension strip deforms and blocks the gap between the cylindrical shell and the shaft.

[0008] The extension strip is inserted into the gap between the cylindrical shell and the shaft and abuts against the side wall of the gap to seal the cavity.

[0009] The cylindrical shell is provided with a flange plate. The flange plate is fixed on the outer wall of the cylindrical shell and is placed at one end of the cylindrical shell.

[0010] Compared with the prior art, the sealing assembly in the application is used in actual use, the shaft of the fan extends out of the shell of the fan, a hole is opened on the shell of the fan, and the shaft extends out of the hole. The sealing assembly in the application is fixed on the shell of the fan by the flange sheet when in use, so that the shaft extending out can pass through the perforation of the columnar shell, that is, the entire sealing assembly is fixed around the shaft, and the flange sheet is fixed on the outer wall of the fan. After being fixed, a gap is formed between the shaft and the columnar shell. At the edge of the columnar shell, the skeleton sealing ring is deformed by being extruded by the outer surface of the shaft, and blocks the two end edges of the gap. Therefore, the edges of the gap are blocked by the skeleton sealing ring, so that the gap forms a closed cavity, the lubricating grease is injected into the cavity through the oil injection hole on the columnar shell, so as to seal the cavity with the lubricating grease, and the skeleton sealing ring is used to form a seal, so as to improve the sealing performance and reduce the air leakage phenomenon of the fan. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1 is a structural schematic view of the shaft sealing piece in the utility model;

[0012] Fig. 2 is a schematic view of the internal structure section of the shaft sealing piece;

[0013] In the figure: 1, the shell of the fan; 2, the flange sheet; 3, the perforation; 4, the skeleton sealing ring; 5, the columnar shell; 6, the oil injection hole; 7, the shaft. DETAILED DESCRIPTION

[0014] In the following, the utility model is further described in combination with the drawings and the specific implementation, and it should be noted that the following described embodiments or technical features can be combined to form new embodiments without conflict.

[0015] REFERENCE Figs. 1-2 , the shaft 7 sealing piece sealing assembly in the application is used in actual use, the shaft 7 of the fan extends out of the shell 1 of the fan, a hole is opened on the shell 1 of the fan, and the shaft 7 extends out of the hole. The shaft 7 sealing piece in the application includes a columnar shell 5, the columnar shell 5 is provided with a perforation 3 for the shaft 7 to pass through along the length direction, and the columnar shell 5 is provided with a sealing assembly on both sides respectively, and the sealing assembly abuts against the shaft 7 and the columnar shell 5 respectively when the shaft 7 passes through the columnar shell 5. The columnar shell 5 is provided with a flange sheet 2, the flange sheet 2 is fixed on the outer wall of the columnar shell 5 and is arranged at one end of the columnar shell 5. The columnar shell 5 can be fixed on the shell 1 of the fan by using the flange sheet 2.

[0016] The outer wall of the cylindrical shell 5 is provided with an oil injection hole 6, which is in communication with the inside of the through hole 3. When the shaft 7 passes through the through hole 3, the oil injection hole 6 is used to inject lubricating grease between the shaft 7 and the inner wall of the shell. The sealing assembly, the cylindrical shell 5 and the shaft 7 form a cavity for accommodating lubricating grease, and the oil injection hole 6 is in communication with the cavity. The cavity is closed by using lubricating grease, and the sealing assembly forms a seal together to improve the sealing performance and reduce the air leakage of the fan. The simultaneously injected lubricating grease also plays a lubricating role on the shaft 7, reducing the hard friction at this position. The durability of the shaft 7 is improved, and the wear of the cylindrical shell 5 is reduced, improving the durability of the sealing element.

[0017] In this embodiment, a receiving groove can be formed on the inner wall of the cylindrical shell 5 along the circumferential direction of the cylindrical shell 5. The sealing assembly is placed in the receiving groove, and the sealing assembly is a skeleton sealing ring 4. The outer end face of the skeleton sealing ring 4 abuts against the receiving groove, and one side of the skeleton sealing ring 4 abuts against the gap between the receiving groove and the shaft 7. The cross section of the receiving groove is L-shaped, and the end face edge of the skeleton sealing ring 4 forms an extension strip extending outward. When the skeleton sealing ring 4 abuts against the receiving groove, the extension strip deforms and blocks the gap between the cylindrical shell 5 and the shaft 7. The skeleton sealing ring 4 is extruded and deformed by the outer surface of the shaft 7, and blocks the two end edges of the gap. Therefore, the edge of the gap is blocked by the skeleton sealing ring 4, so that the gap forms a closed cavity. Lubricating grease is injected into the cavity through the oil injection hole 6 on the cylindrical shell 5 to close the cavity by using lubricating grease, and the skeleton sealing ring 4 forms a seal together to improve the sealing performance and reduce the air leakage of the fan. Of course, when injecting lubricating grease, the skeleton sealing ring 4 far away from the fan can be removed so that the lubricating grease can fill the gap. After the injection is completed, the skeleton sealing ring 4 can be reinstalled to reseal the cavity. The lubricating grease forms a seal together with the sealing assembly to improve the sealing performance and reduce the air leakage of the fan. The simultaneously injected lubricating grease also plays a lubricating role on the shaft 7, reducing the hard friction at this position. The durability of the shaft 7 is improved, and the wear of the cylindrical shell 5 is reduced, improving the durability of the sealing element.

[0018] In this embodiment, in addition to the state that the extension strip can deform, the extension strip is inserted into the gap between the cylindrical shell 5 and the shaft 7 and abuts against the side wall of the gap to seal the cavity in the use state. A better sealing performance is formed.

[0019] Compared with the prior art, the sealing assembly is fixed on the shell 1 of the fan through the flange sheet 2 in use, so that the penetrating shaft 7 can penetrate through the perforation 3 of the columnar shell 5, that is, the whole sealing assembly is fixed around the shaft 7, and the flange sheet 2 is fixed on the outer wall of the fan. After being fixed, a gap is formed between the shaft 7 and the columnar shell 5. At the edge of the columnar shell 5, the skeleton sealing ring 4 is extruded and deformed by the outer surface of the shaft 7, and blocks the two end edges of the gap. Therefore, the edge of the gap is blocked by the skeleton sealing ring 4, so that the gap forms a closed chamber, the lubricating grease is injected into the chamber through the oil injection hole 6 on the columnar shell 5, so as to close the chamber with the lubricating grease, and the skeleton sealing ring 4 is used to form a seal, so as to improve the sealing performance and reduce the air leakage phenomenon of the fan.

[0020] The above-mentioned embodiments are only preferred embodiments of the utility model, and cannot be used to limit the range of protection of the utility model, and any non-substantial changes and replacements made by the person skilled in the art on the basis of the utility model all belong to the range of protection required by the utility model.

Claims

1. A shaft seal, characterized by: The application relates to a sealing assembly for a shaft, comprising a cylindrical shell, a through hole is formed in the cylindrical shell along the length direction of the cylindrical shell for the shaft to pass through, and sealing assemblies are arranged on two sides of the cylindrical shell respectively, the sealing assemblies abut against the shaft and the cylindrical shell respectively when the shaft passes through the cylindrical shell. An oil injection hole is arranged on the outer wall of the cylindrical shell, the oil injection hole is communicated with the inside of the through hole, lubricating grease is injected between the shaft and the inner wall of the shell through the oil injection hole when the shaft passes through the through hole, a chamber for containing lubricating grease is formed among the sealing assembly, the cylindrical shell and the shaft, and the oil injection hole is communicated with the chamber.

2. A shaft seal according to claim 1, wherein: A containing groove is arranged on the inner wall of the cylindrical shell along the circumferential direction of the cylindrical shell, the sealing assembly is arranged in the containing groove, the sealing assembly is a skeleton sealing ring, the outer end surface of the skeleton sealing ring abuts against the containing groove, and one side of the skeleton sealing ring abuts against the gap between the containing groove and the shaft.

3. A shaft seal according to claim 2, wherein: The cross section of the containing groove is L-shaped, the end surface edge of the skeleton sealing ring forms an outwardly extending extension strip, the extension strip is deformed and seals the gap between the cylindrical shell and the shaft when the skeleton sealing ring abuts against the containing groove.

4. A shaft seal according to claim 3, wherein: The extension strip is inserted into the gap between the cylindrical shell and the shaft and abuts against the side wall of the gap to seal the chamber.

5. A shaft seal according to any one of claims 1 to 4, wherein: The cylindrical shell is sleeved with a flange sheet, the flange sheet is fixed on the outer wall of the cylindrical shell and arranged at one end of the cylindrical shell.

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