CN220705658U - Center tube with backflow prevention structure, power head and drilling machine - Google Patents
Center tube with backflow prevention structure, power head and drilling machine Download PDFInfo
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- CN220705658U CN220705658U CN202322317198.3U CN202322317198U CN220705658U CN 220705658 U CN220705658 U CN 220705658U CN 202322317198 U CN202322317198 U CN 202322317198U CN 220705658 U CN220705658 U CN 220705658U
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- 238000005553 drilling Methods 0.000 title claims abstract description 48
- 230000002265 prevention Effects 0.000 title abstract description 9
- 238000011010 flushing procedure Methods 0.000 abstract description 65
- 230000000149 penetrating effect Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 description 24
- 238000007789 sealing Methods 0.000 description 14
- 238000010276 construction Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000010720 hydraulic oil Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002420 orchard Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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- Earth Drilling (AREA)
Abstract
The utility model belongs to the field of geophysical prospecting drilling machines, and particularly relates to a central tube with a backflow preventing structure, a power head and a drilling machine. The central tube with the backflow preventing structure is provided with an arrangement section which is used for being correspondingly arranged with a medium cavity of a central tube sheath of the drilling machine power head, at least two through flow holes which penetrate through the arrangement section are uniformly distributed on the arrangement section along the circumferential direction of the central tube, and at least one through flow hole which penetrates through the arrangement section and is used for backflow prevention is also formed in the arrangement section. Through the drain hole which is arranged on the pipe wall of the arrangement section of the central pipe in a penetrating way and is used for preventing backflow. When the central tube is used, the flushing medium is respectively guided to the inner cavity of the central tube through the overflow hole and the drain hole, and the overflow capacity of the central tube is increased under the cooperation of the overflow hole and the drain hole, so that the flushing medium pressure of the inner cavity of the central tube and the medium cavity can be rapidly reduced to maintain the flushing medium pressure in a balanced state, and further the occurrence of the phenomenon of backflow of the flushing medium can be avoided.
Description
Technical Field
The utility model belongs to the field of geophysical prospecting drilling machines, and particularly relates to a central tube with a backflow preventing structure, a power head and a drilling machine.
Background
When drilling work is carried out by utilizing a mountain drill in the fields of petroleum exploration, geological exploration and the like, a power head is used as an important functional part of the drill, and the main effect of the power head is as follows: firstly, driving a drilling tool to rotate, and transmitting drilling power to a drill bit to achieve the aim of breaking the earth and drilling; secondly, the well washing fluid is conveyed to the center of the drilling tool, so that the purpose of well washing and chip removal is achieved. Generally, two well-flushing mediums are generally used according to geological conditions: air, mud. However, no matter which well-flushing medium is adopted, the well-flushing medium reaches the bottom of the well from the central hole of the drilling tool through the power head of the mountain drilling machine, and drilling (broken stone, dust or soil) is returned to the well head from the gap between the drilling tool and the well hole through certain pressure carried by the well-flushing medium, so that the purpose of drilling footage is realized.
The land in front of the Indian river mountain has complex topography and poor surface condition, mainly is the flood beach, the wetland and the swamp area of the area are larger as the snow melting amount is increased in spring and summer, vegetation is thicker, and the wetland and the saline-alkali soil have no obvious partition; the two-bank areas of the river are distributed with orchards with certain areas, and part of the river beach is washed by river water for a long time to form a large-area saline-alkali area and gravel beach. In connection with field operation conditions and equipment conditions, drilling operations are mainly performed using a power head 100 as shown in fig. 1, the power head 100 including: the central tube sheath 3, the central tube 2 of being connected to hydraulic motor is installed to the rotation of well owner's pipe sheath 3, the fixed bearing 5 that is used for supporting central tube 2 pivoted in central tube 2 relative both ends that set up, central tube sheath 3 both ends respectively with drilling tool link 8 and hydraulic motor fixed connection, be provided with the well flushing medium interface 21 between two bearing 5 that support drilling tool is rotatory on the central tube sheath 3, the annular chamber intercommunication between well flushing medium interface 21 and central tube 2 and the central tube sheath 3 has a plurality of overflow holes 23 with annular chamber intercommunication on the central tube 2 in order to can impress the well flushing medium through the overflow hole 23 into the central tube inner chamber when central tube 2 is rotatory. When the construction method is used for concrete operation, air is used as a medium for construction, but river water can be gushed in after the surface gravel and sandstone are broken at the river side, so that the rock debris at the bottom of the well can not be normally blown out; when water or slurry is used as well flushing medium for construction, the operation and construction requirements can be met, but when the power head has larger external water supply pressure and the overflow hole can not timely guide out the well flushing medium in the annular cavity, the well flushing medium in the annular cavity extrudes a sealing piece between the annular cavity and the bearing mounting cavity under the action of pressure to cause the sealing piece to be invalid, the well flushing medium in the annular cavity passes through the bearing mounting cavity, passes through the joint of the hydraulic motor and the central pipe and enters the hydraulic motor, and further flows back to the hydraulic oil tank through the hydraulic oil pipe to cause the deterioration of hydraulic oil in the oil tank, and meanwhile, hydraulic components are damaged to cause the damage of drilling equipment; in addition, if the well-flushing medium is mud, the bearing is also easily worn; the whole power head is difficult to maintain, the maintenance cost is high, the maintenance period is long, the production operation period is prolonged, and the drilling operation efficiency and the construction progress are affected.
As is well known, different well-flushing mediums have different sealing requirements on the power head, and are influenced by the structure of the power head, when the power head is switched to a non-air well-flushing medium for construction operation, the overflow and pressure relief capability of the central tube are insufficient, and the well-flushing medium is influenced by external pressure to damage the existing sealing structure of the power head, so that the well-flushing medium flows back to the hydraulic motor and other equipment to finally cause the failure of the hydraulic motor and other equipment. Based on the condition limitations of the job site, replacing the equipment means adding additional cost expense, and there is also a risk that the new equipment cannot meet the requirements of the job site; the sealing structure of the power head cannot be further improved due to the limitation of the existing structure of the power head. How to carry out structural optimization to current unit head to solve the problem that the overcurrent of center tube and pressure release ability are not enough becomes urgent demand.
Disclosure of Invention
The utility model aims to provide a central tube with a backflow prevention structure so as to solve the problem that a hydraulic motor and a power head are damaged due to insufficient overflow and pressure relief capability of the central tube when different well flushing media are used by the current power head. The utility model also aims to provide a power head and a drilling machine so as to solve the same problems.
In order to achieve the above purpose, a central tube with a backflow prevention structure in the present utility model adopts the following technical scheme:
the central tube with the backflow preventing structure is provided with an arrangement section which is used for being correspondingly arranged with a medium cavity of a central tube sheath of a drilling machine power head, at least two through flow holes which penetrate through the arrangement section are uniformly distributed on the arrangement section along the circumferential direction of the central tube, and at least one through flow hole which penetrates through the arrangement section and is used for backflow prevention is also formed in the arrangement section.
The beneficial effects of the technical scheme are that: the utility model is based on the prior art and is improved by means of a drainage hole which is arranged on the wall of the arrangement section of the central tube in a penetrating way and is used for preventing backflow. When the central tube is used, the flushing medium is respectively guided to the inner cavity of the central tube through the overflow hole and the drain hole, and the overflow capacity of the central tube is increased under the cooperation of the overflow hole and the drain hole, so that the flushing medium pressure of the inner cavity of the central tube and the medium cavity can be rapidly reduced to maintain the flushing medium pressure in a balanced state, and further the occurrence of the phenomenon of backflow of the flushing medium can be avoided.
Further, at least one of the drain holes and each of the overflow holes are arranged at intervals in the axial direction of the center tube to constitute interval drain holes.
The beneficial effects of the technical scheme are that: the drainage hole and the overflow hole are arranged at intervals in the axial direction of the central tube, so that when the central tube is used, the central tube can be ensured to have enough strength and toughness to meet drilling operation requirements, and the drainage and the pressure relief can be carried out by respectively using the cooperation of the overflow hole and the drainage hole according to different flushing medium pressures, so that the drainage and the pressure relief of the flushing medium are easier to realize.
Further, at least one interval drain hole and any one of the overflow holes are staggered in the axial direction of the central tube to form a staggered drain hole.
The beneficial effects of the technical scheme are that: by means of the arrangement, the drainage holes and the overflow holes are staggered in the axial direction of the central tube, when the central tube rotates, the conduction probability of the drainage holes and the overflow holes and the medium cavity is increased, so that the overflow capacity of the central tube is increased, and the flow guiding of a well flushing medium can be better realized.
Further, a midplane of a center line of two flow-through apertures adjacent to the offset flow-through aperture passes through a center of the offset flow-through aperture.
The beneficial effects of the technical scheme are that: the staggered drainage holes are positioned on the middle vertical surface of the central connecting line of the adjacent overflow holes, so that the drainage holes and the overflow holes are staggered in the circumferential direction of the central pipe, and when the central pipe rotates, the conduction probability of the drainage holes, the overflow holes and the medium cavity is increased, so that the overflow capacity of the central pipe is increased, and the diversion of well flushing medium can be better realized.
Further, the number of the overflow holes is four, the number of staggered drain holes is two, and the overflow holes are uniformly distributed on the circumference.
The beneficial effects of the technical scheme are that: by means of the arrangement, the overflow and pressure relief capacity of the central tube can be fully guaranteed, and the evenly distributed staggered drainage holes can effectively guarantee the strength and toughness of the central tube and balance stress of the central tube.
Further, the interval drain holes are circular, and the distance L between the circle center of each interval drain hole and the circle center of any overflow hole in the axial direction of the central tube meets the following conditions: 2R < L, wherein R is the radius of the flow-through aperture.
The beneficial effects of the technical scheme are that: by the arrangement, the position of the drainage hole is close to the overflow hole, but is kept at a certain distance from the overflow hole, so that the central tube can be ensured to have enough strength and toughness to meet the drilling operation requirement, and meanwhile, the quick overflow and pressure relief can be ensured.
Further, the drain hole is circular.
The beneficial effects of the technical scheme are that: by the arrangement, the circular drainage hole is easy to process, and the strength of the central tube is not easily affected.
Further, the central tube comprises a tube body and a flange positioned at one end of the tube body, the arrangement section is positioned on the tube body, and the outer surface of the tube body is a cylinder with equal diameter.
The beneficial effects of the technical scheme are that: the central tube is connected with the connecting end of the drilling tool through the flange, so that the drilling tool is driven to rotate through the central tube, and the assembly is easy; the pipe body is a cylinder outer surface with equal diameter, so that the pipe body is easy to process and assemble with other parts; the arrangement section on the pipe body ensures that the overflow hole and the drainage hole arranged on the pipe body are positioned in the range of the medium cavity, thereby ensuring the overflow capacity of the central pipe and further avoiding the backflow phenomenon of the well flushing medium.
In order to achieve the above purpose, the power head of the utility model adopts the following technical scheme:
the utility model provides a power head, includes the center tube and is used for driving the rotatory drive component of center tube and the drilling tool of being connected with the center tube, the center tube has the section of arranging that is used for arranging corresponding with the medium chamber of the center tube sheath of rig power head, the circumference equipartition along the center tube on arranging the section is provided with two at least flow holes that link up the section of arranging, still be equipped with at least one on arranging the section and link up the section and be used for preventing the drainage hole of backward flow.
The beneficial effects of the technical scheme are that: the utility model is based on the prior art and is improved by means of a drainage hole which is arranged on the wall of the arrangement section of the central tube in a penetrating way and is used for preventing backflow. When the central tube is used, the flushing medium is respectively guided to the inner cavity of the central tube through the overflow hole and the drain hole, and the overflow capacity of the central tube is increased under the cooperation of the overflow hole and the drain hole, so that the flushing medium pressure of the inner cavity of the central tube and the medium cavity can be rapidly reduced to maintain the flushing medium pressure in a balanced state, and further the occurrence of the phenomenon of backflow of the flushing medium can be avoided.
Further, at least one of the drain holes and each of the overflow holes are arranged at intervals in the axial direction of the center tube to constitute interval drain holes.
The beneficial effects of the technical scheme are that: the drainage hole and the overflow hole are arranged at intervals in the axial direction of the central tube, so that when the central tube is used, the central tube can be ensured to have enough strength and toughness to meet drilling operation requirements, and the drainage and the pressure relief can be carried out by respectively using the cooperation of the overflow hole and the drainage hole according to different flushing medium pressures, so that the drainage and the pressure relief of the flushing medium are easier to realize.
Further, at least one interval drain hole and any one of the overflow holes are staggered in the axial direction of the central tube to form a staggered drain hole.
The beneficial effects of the technical scheme are that: by means of the arrangement, the drainage holes and the overflow holes are staggered in the axial direction of the central tube, when the central tube rotates, the conduction probability of the drainage holes and the overflow holes and the medium cavity is increased, so that the overflow capacity of the central tube is increased, and the flow guiding of a well flushing medium can be better realized.
Further, a midplane of a center line of two flow-through apertures adjacent to the offset flow-through aperture passes through a center of the offset flow-through aperture.
The beneficial effects of the technical scheme are that: the staggered drainage holes are positioned on the middle vertical surface of the central connecting line of the adjacent overflow holes, so that the drainage holes and the overflow holes are staggered in the circumferential direction of the central pipe, and when the central pipe rotates, the conduction probability of the drainage holes, the overflow holes and the medium cavity is increased, so that the overflow capacity of the central pipe is increased, and the diversion of well flushing medium can be better realized.
Further, the number of the overflow holes is four, the number of staggered drain holes is two, and the overflow holes are uniformly distributed on the circumference.
The beneficial effects of the technical scheme are that: by means of the arrangement, the overflow and pressure relief capacity of the central tube can be fully guaranteed, and the evenly distributed staggered drainage holes can effectively guarantee the strength and toughness of the central tube and balance stress of the central tube.
Further, the interval drain holes are circular, and the distance L between the circle center of each interval drain hole and the circle center of any overflow hole in the axial direction of the central tube meets the following conditions: 2R < L, wherein R is the radius of the flow-through aperture.
The beneficial effects of the technical scheme are that: by the arrangement, the position of the drainage hole is close to the overflow hole, but is kept at a certain distance from the overflow hole, so that the central tube can be ensured to have enough strength and toughness to meet the drilling operation requirement, and meanwhile, the quick overflow and pressure relief can be ensured.
Further, the drain hole is circular.
The beneficial effects of the technical scheme are that: by the arrangement, the circular drainage hole is easy to process, and the strength of the central tube is not easily affected.
Further, the central tube comprises a tube body and a flange positioned at one end of the tube body, the arrangement section is positioned on the tube body, and the outer surface of the tube body is a cylinder with equal diameter.
The beneficial effects of the technical scheme are that: the central tube is connected with the connecting end of the drilling tool through the flange, so that the drilling tool is driven to rotate through the central tube, and the assembly is easy; the pipe body is a cylinder outer surface with equal diameter, so that the pipe body is easy to process and assemble with other parts; the arrangement section on the pipe body ensures that the overflow hole and the drainage hole arranged on the pipe body are positioned in the range of the medium cavity, thereby ensuring the overflow capacity of the central pipe and further avoiding the backflow phenomenon of the well flushing medium.
In order to achieve the above purpose, the drilling machine of the utility model adopts the following technical scheme:
the utility model provides a rig, includes the unit head, the unit head includes the center tube and is used for driving the rotatory drive component of center tube and the drilling tool of being connected with the center tube, the center tube has the section of arranging that is used for arranging corresponding with the medium chamber of the center tube sheath of rig unit head, the circumference equipartition along the center tube on arranging the section is provided with two at least and link up the section of arranging the section and cross the discharge port that the section was arranged and is used for preventing the backward flow is still equipped with on arranging the section.
The beneficial effects of the technical scheme are that: the utility model is based on the prior art and is improved by means of a drainage hole which is arranged on the wall of the arrangement section of the central tube in a penetrating way and is used for preventing backflow. When the central tube is used, the flushing medium is respectively guided to the inner cavity of the central tube through the overflow hole and the drain hole, and the overflow capacity of the central tube is increased under the cooperation of the overflow hole and the drain hole, so that the flushing medium pressure of the inner cavity of the central tube and the medium cavity can be rapidly reduced to maintain the flushing medium pressure in a balanced state, and further the occurrence of the phenomenon of backflow of the flushing medium can be avoided.
Further, at least one of the drain holes and each of the overflow holes are arranged at intervals in the axial direction of the center tube to constitute interval drain holes.
The beneficial effects of the technical scheme are that: the drainage hole and the overflow hole are arranged at intervals in the axial direction of the central tube, so that when the central tube is used, the central tube can be ensured to have enough strength and toughness to meet drilling operation requirements, and the drainage and the pressure relief can be carried out by respectively using the cooperation of the overflow hole and the drainage hole according to different flushing medium pressures, so that the drainage and the pressure relief of the flushing medium are easier to realize.
Further, at least one interval drain hole and any one of the overflow holes are staggered in the axial direction of the central tube to form a staggered drain hole.
The beneficial effects of the technical scheme are that: by means of the arrangement, the drainage holes and the overflow holes are staggered in the axial direction of the central tube, when the central tube rotates, the conduction probability of the drainage holes and the overflow holes and the medium cavity is increased, so that the overflow capacity of the central tube is increased, and the flow guiding of a well flushing medium can be better realized.
Further, a midplane of a center line of two flow-through apertures adjacent to the offset flow-through aperture passes through a center of the offset flow-through aperture.
The beneficial effects of the technical scheme are that: the staggered drainage holes are positioned on the middle vertical surface of the central connecting line of the adjacent overflow holes, so that the drainage holes and the overflow holes are staggered in the circumferential direction of the central pipe, and when the central pipe rotates, the conduction probability of the drainage holes, the overflow holes and the medium cavity is increased, so that the overflow capacity of the central pipe is increased, and the diversion of well flushing medium can be better realized.
Further, the number of the overflow holes is four, the number of staggered drain holes is two, and the overflow holes are uniformly distributed on the circumference.
The beneficial effects of the technical scheme are that: by means of the arrangement, the overflow and pressure relief capacity of the central tube can be fully guaranteed, and the evenly distributed staggered drainage holes can effectively guarantee the strength and toughness of the central tube and balance stress of the central tube.
Further, the interval drain holes are circular, and the distance L between the circle center of each interval drain hole and the circle center of any overflow hole in the axial direction of the central tube meets the following conditions: 2R < L, wherein R is the radius of the flow-through aperture.
The beneficial effects of the technical scheme are that: by the arrangement, the position of the drainage hole is close to the overflow hole, but is kept at a certain distance from the overflow hole, so that the central tube can be ensured to have enough strength and toughness to meet the drilling operation requirement, and meanwhile, the quick overflow and pressure relief can be ensured.
Further, the drain hole is circular.
The beneficial effects of the technical scheme are that: by the arrangement, the circular drainage hole is easy to process, and the strength of the central tube is not easily affected.
Further, the central tube comprises a tube body and a flange positioned at one end of the tube body, the arrangement section is positioned on the tube body, and the outer surface of the tube body is a cylinder with equal diameter.
The beneficial effects of the technical scheme are that: the central tube is connected with the connecting end of the drilling tool through the flange, so that the drilling tool is driven to rotate through the central tube, and the assembly is easy; the pipe body is a cylinder outer surface with equal diameter, so that the pipe body is easy to process and assemble with other parts; the arrangement section on the pipe body ensures that the overflow hole and the drainage hole arranged on the pipe body are positioned in the range of the medium cavity, thereby ensuring the overflow capacity of the central pipe and further avoiding the backflow phenomenon of the well flushing medium.
Drawings
FIG. 1 is a schematic diagram of a prior art power head;
FIG. 2 is a schematic perspective view of a center tube according to the present utility model;
fig. 3 is a front view of fig. 2.
In the figure: 100. a power head; 1. a driving part; 2. a central tube; 3. a center tube sheath; 4. adjusting the nut; 5. a bearing; 6. a seal assembly; 7. an end cap; 8. a drill tool connection end;
21. a well flushing medium interface; 22. a medium chamber; 23. an overflow hole; 24. a drain hole; 25. an external thread section; 26. and (3) a flange.
Detailed Description
The features and capabilities of the present utility model are described in further detail below in connection with the examples.
Example 1 of the power head in the present utility model:
different well flushing mediums have different sealing requirements on the power head, and are influenced by the structure of the power head, when the power head is switched into a non-air well flushing medium to perform construction operation, the overflow and pressure relief capability of the central tube are insufficient, and the well flushing medium is influenced by external pressure to damage the existing sealing structure of the power head, so that the well flushing medium flows back to the hydraulic motor and other equipment to finally cause the hydraulic motor and other equipment to fail. Based on the condition limitations of the job site, replacing the equipment means adding additional cost expense, and there is also a risk that the new equipment cannot meet the requirements of the job site; the sealing structure of the power head cannot be further improved due to the limitation of the existing structure of the power head. How to carry out structural optimization to current unit head to solve the problem that the overcurrent of center tube and pressure release ability are not enough becomes urgent demand.
The utility model provides a central tube with a backflow prevention structure, which is provided with an arrangement section which is used for being correspondingly arranged with a medium cavity of a central tube sheath of a drilling machine power head, wherein at least two through flow holes which penetrate through the arrangement section are uniformly distributed on the arrangement section along the circumferential direction of the central tube, and at least one drainage hole which penetrates through the arrangement section and is used for backflow prevention is also arranged on the arrangement section. The utility model is through-arranged on the wall of the arrangement section of the central tube and is used for preventing backflow. When the central tube is used, the flushing medium is respectively guided to the inner cavity of the central tube through the overflow hole and the drain hole, and the overflow capacity of the central tube is increased under the cooperation of the overflow hole and the drain hole, so that the flushing medium pressure of the inner cavity of the central tube and the medium cavity can be rapidly reduced to maintain the flushing medium pressure in a balanced state, and further the occurrence of the phenomenon of backflow of the flushing medium can be avoided.
As shown in fig. 1, the power head 100 comprises a driving part 1 and a central tube sheath 3 connected with a flange (not shown) of the driving part by bolts, a central tube 2 connected with an output shaft of the driving part 1 is rotatably installed in the central tube sheath 3, one end of the central tube sheath 3 far away from the driving part 1 is provided with an end cover 7, the end cover 7 is fixedly connected with the lower end surface of the central tube sheath 3 by bolts, specifically, two opposite ends of the central tube 2 are fixedly provided with bearings 5 for supporting the central tube 2 to rotate, and the central tube 2 is installed in the central tube sheath 3 by the bearings 5; the central tube 2 is connected with the driving part 1 through a key, the lower end of the central tube 2 penetrates through the end cover 7 and is fixedly connected with the drilling tool connecting end 8 and the central tube 2 through bolts, and the fixed connection of the drilling tool and the central tube 2 is realized. In the embodiment, the driving part 1 is a hydraulic motor, and the bearing 5 is a proper bearing model according to design requirements; the connection or cooperation between the central tube sheath 3 and the drive member 1 is well known in the art and will not be described in detail here.
The central tube sheath 3 includes bearing mounting cavities at both ends for mounting the bearings 5 and a medium cavity 22 connecting the bearing mounting cavities at both ends. Specifically, the inner diameter of the bearing mounting cavity is larger than that of the medium cavity, and is in a step shape in the center tube sheath 3, and the step shape forms a mounting seat for mounting the bearing 5; the central tube sheath 3, the central tube 2 and the bearings 5 assembled at the two ends of the central tube 2 form an annular space, the annular space forms a medium cavity 22 for temporarily storing well flushing medium, the two ends of the medium cavity 22 are respectively provided with a sealing component 6, the central tube sheath 3 is provided with a well flushing medium interface 21 which is positioned between the two bearings 5 and is radially connected with the central tube sheath 3, and the well flushing medium interface 21 is communicated with the medium cavity 22. In this embodiment, the sealing assembly 6 may adopt a conventional shaft sealing structure, and sealing elements are respectively arranged between the end cover 7 and the middle main pipe sheath 3 and between the end cover 7 and the center pipe 2, which are all of conventional design and will not be described in detail herein.
As shown in fig. 2 to 3, the central tube 2 comprises a tube body and a flange 26 at one end of the tube body and connected to the drill connection end 8 remote from the drive member 1, the tube body comprising an externally threaded section 25 connected to the drive member 1 and an arrangement section arranged in correspondence with the medium chamber 22, and bearing and seal mounting sections between the externally threaded section 25 and the arrangement section and between the arrangement section and the flange 26. Specifically, a spline groove (not labeled in the figure) is further formed in one side wall of the external thread section 25, the spline is embedded into the spline groove, the central tube 2 is connected with an output shaft of the driving component 1 through the spline, so that the driving component can drive the central tube to rotate, an adjusting nut 4 is further arranged on the external thread section 25 of the central tube 2, and fine adjustment of the central tube 2 along the axial direction of the central tube 2 can be realized through the cooperation of the adjusting nut 4 and the central tube 2; the arrangement section of the central tube 2 is matched with the medium cavity 22, a plurality of through flow holes 23 which are uniformly distributed along the circumferential direction of the central tube 2 are formed in the arrangement section of the central tube 2, and the flow holes 23 are communicated with the medium cavity 22; the bearing and the sealing installation section are respectively sleeved with a bearing 5 and a sealing component 6. In this embodiment, the outer surface of the tube body is a cylinder with equal diameter.
In this embodiment, four radial and uniformly distributed overflow holes 23 are formed on the pipe wall of the arrangement section of the central pipe 2 corresponding to the flushing medium interface 21, so that a flushing medium passage formed by the flushing medium interface 21, the medium cavity 22, the overflow holes 23 and the inner cavity of the central pipe is formed, and when the central pipe 2 rotates relative to the central pipe sheath 3, the flushing medium can be pressed into the inner cavity of the central pipe from the flushing medium interface 21 through the overflow holes 23. In other embodiments, the flow holes 23 may be two, three, or other suitable number that ensures the working strength of the center tube.
In the embodiment, two circular drain holes 24 which penetrate through the arrangement section and are used for preventing backflow are arranged on the arrangement section of the central tube 2, the drain holes 24 are communicated with the medium cavity 22, the two drain holes 24 are oppositely arranged, and the drain holes 24 form a backflow preventing structure of the central tube 2; in order to ensure the strength and toughness of the central tube 2, two drain holes 24 are respectively arranged at intervals with the overflow holes 22 in the axial direction of the central tube 2; further, the drain hole 24 and any one of the overflow holes 23 are arranged in a staggered manner in the axial direction of the central tube 2, that is, the center of the drain hole 24 and the center of any one of the overflow holes 23 are not overlapped in the projection of the central tube 2 in the axial direction, or the center of the confluence hole 24 and the center of any one of the overflow holes 23 are not aligned in the axial direction of the central tube 2, specifically, the center of the drain hole 24 is crossed by the center vertical plane of the center connecting line of two overflow holes 23 adjacent to the drain hole 24, and the distance L between the center of the drain hole 24 and the center of any one of the overflow holes 23 in the axial direction of the central tube 2 satisfies the following conditions: 2R < l, where R is the radius of the flow-through aperture 23. In this way, the position of the drain hole 24 is close to the overflow hole 23, but keeps a certain distance from the overflow hole 23, so that under the cooperation of the drain hole 24 and the overflow hole 23, the overflow and pressure release capacity of the central tube 2 is improved, and meanwhile, the central tube can be ensured to have enough strength and toughness to meet the drilling operation requirement.
Power head example 2 of the present utility model:
the present embodiment is directed to providing a different drainage hole arrangement mode, and the main difference between the present embodiment and the specific embodiment 1 is that: in this embodiment, only one drain hole is provided; in other embodiments, the drain holes may be three, four, or other suitable numbers.
Power head example 3 of the present utility model:
the present embodiment is directed to providing a different drainage hole arrangement mode, and the main difference between the present embodiment and the specific embodiment 1 is that: in this embodiment, the centers of the drain hole and the overflow hole are on the same plane in the axial direction of the central tube, that is, the drain hole and the overflow hole are not staggered in the axial direction, but are aligned in the axial direction.
Power head example 4 of the present utility model:
the present embodiment is directed to providing a different drainage hole arrangement mode, and the main difference between the present embodiment and the specific embodiment 1 is that: in this embodiment, the drain holes are axially non-spaced from the vent holes, spaced apart on the same circumference, and located between the two vent holes.
Power head example 5 of the present utility model:
the present embodiment is directed to providing a different drainage hole arrangement mode, and the main difference between the present embodiment and the specific embodiment 1 is that: in this embodiment, the drain hole is axially offset from the overflow hole, but the mid-flap is not past the center of the drain hole, i.e., the center of the drain hole is offset from the mid-flap.
Power head example 6 of the present utility model:
the present embodiment aims to provide a different drainage hole structure, and the main difference between the present embodiment and the specific embodiment 1 is that: in this embodiment, the drain hole is oval or other structural shape that is easy to machine and that ensures the strength of the center tube.
Power head example 7 of the present utility model:
the purpose of this embodiment is to provide a different pipe body structure, and the main difference between this embodiment and embodiment 1 is that: in this embodiment, the outer surface of the pipe body is a cylinder with a variable diameter, specifically, the outer diameter of the arrangement section is larger or smaller than the outer diameter of the threaded section, or the outer diameter of the arrangement section is larger or smaller than the outer diameter of the bearing and seal installation section. In other embodiments, the outer diameters of the two ends of the arrangement section are unequal in diameter, and the outer diameters of the threaded section and the bearing and seal mounting section are respectively matched with the outer diameters of the two ends of the arrangement section.
Power head example 8 of the present utility model:
the present embodiment aims to provide a different positional relationship between the drain hole and the overflow hole, and the main difference between the present embodiment and the specific embodiment 1 is that: in this embodiment, the distance L between the center of the interval drain hole and the center of any overflow hole in the axial direction of the center tube satisfies the condition: l=2r, where R is the radius of the flow-through aperture.
Embodiments of the drilling machine in the present utility model:
the drilling machine comprises a power head, wherein the power head comprises a central pipe, a driving part for driving the central pipe to rotate and a drilling tool connected with the central pipe, and the central pipe is the central pipe in the embodiment of the power head and is not described herein.
Embodiments of the center tube with backflow prevention structure in the present utility model:
the central tube with the backflow preventing structure is the central tube in the power head embodiment, and is not described herein.
The above description is only a preferred embodiment of the present utility model, and the patent protection scope of the present utility model is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. The utility model provides a center tube with prevent backward flow structure, this center tube has the section of arranging that is used for arranging corresponding with the medium chamber of the center tube sheath of rig unit head, arrange the section on along the circumference equipartition of center tube and be provided with two at least through hole of arranging the section, its characterized in that: the arrangement section is also provided with at least one drainage hole which penetrates through the arrangement section and is used for preventing backflow.
2. The center tube with backflow preventing structure according to claim 1, wherein: at least one of the drain holes and each of the overflow holes are arranged at intervals in the axial direction of the central tube to form interval drain holes.
3. The center tube with backflow preventing structure according to claim 2, wherein: at least one interval drain hole and any one of the overflow holes are staggered in the axial direction of the central tube to form a staggered drain hole.
4. A center tube having a backflow preventing structure as set forth in claim 3, wherein: the center vertical surface of the center connecting line of the two overflow holes adjacent to the staggered overflow hole passes through the center of the staggered overflow hole.
5. The center tube with backflow preventing structure according to claim 4, wherein: the number of the overflow holes is four, and the number of the staggered drain holes is two and the circumference of the staggered drain holes is uniformly distributed.
6. The center tube with backflow preventing structure according to any one of claims 2 to 5, wherein: the interval drain holes are circular, and the distance L between the circle center of each interval drain hole and the circle center of any overflow hole in the axial direction of the central tube meets the following conditions: 2R < L, wherein R is the radius of the flow-through aperture.
7. The center tube with backflow preventing structure according to any one of claims 1 to 5, wherein: the drain hole is circular.
8. The center tube with backflow preventing structure according to any one of claims 1 to 5, wherein: the central tube comprises a tube body and a flange positioned at one end of the tube body, the arrangement section is positioned on the tube body, and the outer surface of the tube body is a cylinder with equal diameter.
9. The utility model provides a unit head, includes center tube and is used for driving the rotatory drive unit of center tube and the drilling tool of being connected with the center tube, its characterized in that: the center tube is the center tube having the backflow preventing structure according to any one of claims 1 to 8.
10. The utility model provides a rig, includes the unit head, and the unit head includes center tube and is used for driving the rotatory drive unit of center tube and the drilling tool of being connected with the center tube, its characterized in that: the center tube is the center tube having the backflow preventing structure according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322317198.3U CN220705658U (en) | 2023-08-28 | 2023-08-28 | Center tube with backflow prevention structure, power head and drilling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322317198.3U CN220705658U (en) | 2023-08-28 | 2023-08-28 | Center tube with backflow prevention structure, power head and drilling machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220705658U true CN220705658U (en) | 2024-04-02 |
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ID=90442721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322317198.3U Active CN220705658U (en) | 2023-08-28 | 2023-08-28 | Center tube with backflow prevention structure, power head and drilling machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220705658U (en) |
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2023
- 2023-08-28 CN CN202322317198.3U patent/CN220705658U/en active Active
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