CN201053493Y - Piston of pneumatic rock drill - Google Patents
Piston of pneumatic rock drill Download PDFInfo
- Publication number
- CN201053493Y CN201053493Y CNU2007201112442U CN200720111244U CN201053493Y CN 201053493 Y CN201053493 Y CN 201053493Y CN U2007201112442 U CNU2007201112442 U CN U2007201112442U CN 200720111244 U CN200720111244 U CN 200720111244U CN 201053493 Y CN201053493 Y CN 201053493Y
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- CN
- China
- Prior art keywords
- piston
- air
- annular grooves
- cylinder
- circular groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model discloses a piston for a pneumatic rock drill; an external circle of a large end of the piston is provided with four annular grooves which are divided into two groups according to the directions of gas leakage, wherein, the left side of one group of two annular grooves and the axis of the external circle form an angle, and the right side of one group of two annular grooves is vertical to the axis of the external circle, while the other group of two annular grooves is in the contrary state; the sections of the annular grooves are of a bell mouth shape. The piston forms a labyrinth seal when the piston matches with an inner hole of a cylinder; when compressed air enters into the annular grooves from a diagonal side gap of the annular grooves, the cubage of air is suddenly enlarged, and the pressure of the air is reduced, meanwhile, the air also forms a turbulent flow in the annular grooves, and the compressed air is blocked to continuously enter, the pressure of the air gets lower, thereby improving the sealing property between the piston and the inner hole of the cylinder, and reducing air leakage; therefore, not only the service performance of the rock drill is improved but also the consumption of the compressed air is reduced, and energy is conserved. When the labyrinth seal is used, a gap between two parts can be increased by four times, thereby prolonging the service life of parts.
Description
Technical field
The utility model relates to a kind of piston, relates in particular to a kind of piston that is applicable to air drill.
Background technique
In air drill commonly used, a piston all is housed, as the major part of rock drill, piston is contained in the cylinder, and its major part cooperates with cylinder bore, can be along the cylinder bore back and forth movement, its microcephaly then matches with the endoporus of guide sleeve.Piston can be in cylinder under compressed-air actuated effect back and forth movement.But the cylindrical of piston and the endoporus of cylinder all are smooth, be Spielpassung between them, therefore, the pressure difference that forms when pressurized air enters will inevitably make a spot of gas leak from the gap, both influence the usability of rock drill, increased compressed-air actuated consumption again.And along with the growth of service time, various parts all can wear and tear, and the gap between also can increase gradually mutually, and the gas of leakage also can increase, and time certain, will influence the use of rock drill, and renewal part could continue to use again.
The model utility content
The purpose of this utility model provides a kind of air drill piston, the air drill of existing piston solve to be installed because pressurized air leaks makes compressed air loss and influence usability, and the technological deficiency of the part weak point in working life that causes of mechanical wear.Simple in structure, satisfactory for result.
For addressing the above problem, the technical solution adopted in the utility model is:
A kind of air drill piston, comprise piston only, piston only is installed in the cylinder of air drill, microcephaly's cylindrical of piston passes from the endoporus of guide sleeve, be Spielpassung between the major part cylindrical of the cylinder of described air drill and described piston, it is characterized in that: the major part outer round surface of described piston has four road circular grooves, when being cooperated with cylinder, it forms labyrinth sealing, thereby increase sealing between the two, reduce compressed-air actuated leakage,, reduce compressed-air actuated consumption, reach the purpose of energy saving, and improve the usability of air drill.
Further, the cross section of described four road circular grooves is a bell mouth shape.
Further, described four road circular grooves are divided into two groups according to the gas leakage direction, the left side of one group twice circular groove and cylindrical axis are at an angle, right side and cylindrical axis normal, the twice circular groove of another group then in contrast, left side and cylindrical axis normal, right side and cylindrical axis are at an angle.
Major part outer round surface at described piston is provided with four road circular grooves, when being cooperated with cylinder inner wall, it forms labyrinth sealing, thereby increase sealing between the two, reduce the leakage of gas, and then the usability of raising rock drill, reduce compressed-air actuated consumption, reach the purpose of energy saving, employing is divided into two groups with four road circular grooves according to the gas leakage direction, the left side of one group twice circular groove and cylindrical axis are at an angle, right side and cylindrical axis normal, the twice circular groove of another group then in contrast, left side and cylindrical axis normal, right side and cylindrical axis structure at an angle can make pressurized air can not leak when entering piston two ends difference cavity in turn.
The beneficial effects of the utility model:
The utility model has adopted said structure, major part cylindrical at piston is provided with circular groove, realized the labyrinth sealing between the major part cylindrical of cylinder and piston of air drill by circular groove, solved the air drill that existing piston is installed because pressurized air leaks the technological deficiency that makes compressed air loss and influence usability.Owing to the better tightness that forms between piston that is provided with four road circular grooves and the cylinder, even increase in after the air drill work long period because the gap of wearing and tearing between the cylinder and piston major part cylindrical that causes air drill, still can realize the better seal effect, thereby prolonged the working life of cylinder and piston greatly, avoid the frequent replacing of air drill upper cylinder and piston, reduced cost of production.The utility model is simple in structure, and is reasonable in design, well realized purpose of design of the present utility model.
Description of drawings
Shown in the figure longitudinal sectional drawing of piston when cooperating with other part.
Embodiment
As shown in the figure, a kind of air drill piston, comprise piston only 2, piston only 2 is installed in the cylinder 1 of air drill, microcephaly's cylindrical of piston 2 passes from the endoporus of guide sleeve 3, between the cylinder 1 of described air drill and the major part cylindrical of described piston 2 is Spielpassung, it is characterized in that: the major part outer round surface of described piston 2 has four road circular grooves.The cross section of four road circular grooves is a bell mouth shape, described four road circular grooves are divided into two groups according to the gas leakage direction, the left side of one group twice circular groove and cylindrical axis are at an angle, right side and cylindrical axis normal, the twice circular groove of another group then in contrast, left side and cylindrical axis normal, right side and cylindrical axis are at an angle.
During air drill work, described piston 2 is left and right sides back and forth movement in the cylinder 1 at air drill under the compressed-air actuated effect, when pressurized air enters cavity 5, gas pressure in the cavity 5 is higher, will inevitably from the gap between piston 2 and the cylinder 1, leak to cavity 4, at this moment, the twice circular groove of surface, the outer garden of the major part of described piston 2 upper plenum 5 one sides plays the labyrinth sealing effect, the left side of the twice circular groove of cavity 5 one sides and cylindrical axis are at an angle, according to the labyrinth sealed principle, after pressurized air enters circular groove from the oblique side clearance of circular groove, gas volume increases suddenly, its pressure reduces immediately, simultaneously, gas also can form turbulent flow in circular groove, hindering compressed-air actuated the continuation enters, make the pressure of gas become lower, when gas again when the vertical side of circular groove is leaked speed will slow down, the gas that leaks out from the first road circular groove enters the second road circular groove again, the same when entering the first road circular groove, gas pressure can reduce again, like this through behind the twice circular groove, compressed-air actuated pressure can be reduced near atmospheric pressure, gas pressure in cavity 5 and the cavity 4 is equal substantially, gas just can not leak to cavity 4 from cavity 5, thereby has reduced compressed-air actuated leakage.Otherwise, when pressurized air enters cavity 4, gas pressure in the cavity 4 is higher, will inevitably from the gap between described piston 2 and the cylinder 1, leak to cavity 5, the twice circular groove of the outer surface, garden of piston major part this moment on cavity 4 one sides promptly plays the labyrinth sealed effect, gas can not leaked to cavity 5 from cavity 4, thereby reduced compressed-air actuated leakage, reach the purpose of this utility model.
It should be noted that embodiment only is to of the present utility model further specifying and non-limiting, any employing essence invention of the present utility model spirit and only the utility model is made simple transformation is still in protection domain of the present utility model.
Claims (3)
1. air drill piston, comprise piston only, piston only is installed in the cylinder (1) of air drill, microcephaly's cylindrical of described piston (2) passes from the endoporus of guide sleeve (3), between the major part cylindrical of cylinder of described air drill (1) and described piston (2) is Spielpassung, it is characterized in that: the major part outer round surface of described piston (2) has four road circular grooves.
2. a kind of air drill piston according to claim 1 is characterized in that: described four its cross sections of road circular groove are bell mouth shape.
3. a kind of air drill piston according to claim 1 and 2, it is characterized in that: described four road circular grooves are divided into two groups according to the gas leakage direction, the left side of one group twice circular groove and cylindrical axis are at an angle, right side and cylindrical axis normal, the twice circular groove of another group then in contrast, left side and cylindrical axis normal, right side and cylindrical axis are at an angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201112442U CN201053493Y (en) | 2007-06-28 | 2007-06-28 | Piston of pneumatic rock drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201112442U CN201053493Y (en) | 2007-06-28 | 2007-06-28 | Piston of pneumatic rock drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201053493Y true CN201053493Y (en) | 2008-04-30 |
Family
ID=39393156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201112442U Expired - Fee Related CN201053493Y (en) | 2007-06-28 | 2007-06-28 | Piston of pneumatic rock drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201053493Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102444381A (en) * | 2011-12-06 | 2012-05-09 | 铜陵市久泰重型工矿设备有限公司 | Rock drill piston rod |
-
2007
- 2007-06-28 CN CNU2007201112442U patent/CN201053493Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102444381A (en) * | 2011-12-06 | 2012-05-09 | 铜陵市久泰重型工矿设备有限公司 | Rock drill piston rod |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080430 |