TWI869091B - Fluid drive device - Google Patents

Abstract

A fluid driving device includes a handle body, a bearing sleeve, a bearing unit, a bearing unit, a shaft and an impeller. The handle body has an annular wall, an inlet channel group and an outlet channel group, the bearing sleeve includes a circumferential wall and a drainage hole group, the bearing unit is installed in an inner hole of the bearing sleeve, the shaft is installed in the inner hole and includes a driving section and a supporting section supported by the bearing unit, the impeller is fixed to the driving section and is located on one side of the bearing unit, and includes a plurality of blades corresponding to the drainage hole group and the outlet channel group. When a driving fluid is introduced from the inlet channel set and flows through the drainage hole set, the impeller is driven to rotate, and the impeller then drives the shaft to rotate. The outlet channel set for discharging the driving fluid is arranged on the outer periphery of the bearing sleeve, which can reduce the damage rate of the bearing unit.

Description

Fluid drive device

The present invention relates to a power tool, and more particularly to a fluid-driven device.

There is a turbine power unit for a power tool (Republic of China patent No. I751555B), which includes a turbine housing, a first bearing installed inside the turbine housing, a second bearing installed inside the turbine housing and spaced apart from the first bearing, a shaft supported by the first bearing and the second bearing, a turbine connected to the shaft, a cover locked to the turbine housing, and an additional cover locked to the turbine housing.

When a driving medium is introduced from a through opening of the turbine housing, the driving medium can drive the turbine and the shaft to rotate.

Although the turbine power unit of this power tool can achieve the expected driving purpose, because the first bearing and the second bearing are located on both sides of the turbine, when the driving medium is water or cutting fluid, the first bearing and the second bearing are easily damaged due to long-term contact with water or cutting fluid, and the frequency of replacement is high. In addition, the disassembly and repair of the first bearing and the second bearing when damaged will consume a lot of time.

In addition, the driving medium does not have a design for stabilizing pressure and flow rate, and the rotation stability of the turbine is poor.

Therefore, the object of the present invention is to provide a fluid driving device that can solve the existing deficiencies.

Therefore, the fluid drive device of the present invention includes a handle body, a bearing sleeve, a bearing unit, a bearing unit, a shaft and an impeller. The handle body extends along an axis, and has an annular wall that can define a chamber, an inlet channel group connected from the outside to the chamber, and an outlet channel group connected from the chamber to the outside. The bearing sleeve is installed inside the chamber, and includes a peripheral wall that can define an inner hole, and a drainage hole group arranged on the peripheral wall and connected to the inlet channel. The drainage hole group has a plurality of drainage holes arranged at intervals around the axis, and each drainage hole extends along a center line. The outlet channel group is located on the outer periphery of the bearing sleeve. The bearing unit is installed in the inner hole of the bearing sleeve. The shaft extends along the axis and is installed in the inner hole of the bearing sleeve, and includes a driving section corresponding to the drainage hole group, and a supporting section arranged on one side of the driving section along the axis and supported by the bearing unit. The impeller is fixed to the driving section of the shaft and is located on one side of the bearing unit, and includes a plurality of blades corresponding to the drainage hole group and the outlet channel group, and the center lines substantially intersect the corresponding blades.

The effect of the present invention is that: by utilizing the overall configuration, the impeller is fixed to the driving section of the shaft and is located on one side of the bearing unit, and the guide channel assembly is located on the outer periphery of the bearing sleeve, a path for discharging a driving fluid does not pass through the bearing unit, the driving fluid avoids direct impact on the bearing unit, and the damage rate of the bearing unit can be reduced.

1 to 4 , an embodiment of the driving fluid driving device of the present invention includes a handle body 10, a bearing sleeve 20, a bearing unit 30, a bearing unit 30, a shaft 40, a collet 50, a screw 60, an impeller 70 and a front cover 80.

The handle body 10 extends along an axis L and includes a cylinder 11 and a handle 12 connected to the cylinder 11 along the axis L. The cylinder 11 has an annular wall 111 that can define a chamber 110, an end wall 112 connected to the annular wall 111, an inlet channel set 13 connected from the outside to the chamber 110, and an outlet channel set 14 connected from the chamber 110 to the outside. The handle 12 is intersected and connected to the end wall 112. The annular wall 111 and the end wall 112 jointly define the chamber 110, and the chamber 110 is open in one direction and has an inner end 113 adjacent to the end wall 112, and an open end 114 opposite to the inner end 113 along the axis L. The annular wall 111 has an inner wall surface 115 adjacent to the chamber 110, and an inner threaded portion 116 disposed on the inner wall surface 115 and corresponding to the open end 114. The end wall 112 has a recessed hole 117 connected to the chamber 110. The guide channel assembly 13 has an introduction section 131 extending along the axis L and disposed inside the handle 12, a plurality of conducting sections 132 disposed on the end wall 112 and connected to the introduction section 131, and a plurality of lead-out sections 133 disposed on the annular wall 111 and connected to the drainage hole 231. Referring to FIG. 5 , the conducting sections 132 are arranged radially around the axis L. 7 , each lead-out section 133 has a connecting hole 134 connected to the corresponding conducting section 132, and a water storage tank 135 connected to the chamber 110 and recessed by the inner wall surface 115. The volume of any part of each water storage tank 135 perpendicular to the axis L is greater than the cross-sectional area of any part of the corresponding conducting section 132 perpendicular to the axis L. 6 , the guide channel assembly 14 has a plurality of guide grooves 141 that are arranged at intervals around the axis L and recessed from the inner wall surface 115 , and a plurality of straight groove sections 142 that extend from the guide grooves 141 toward the open end 114 . The volume of any portion of each guide groove 141 perpendicular to the axis L is greater than the cross-sectional area of any portion of the corresponding straight groove section 142 perpendicular to the axis L. The guide grooves 141 are connected to the recessed hole 117 .

The bearing sleeve 20 is hollow cylindrical and installed inside the chamber 110, and includes a peripheral wall 22 that can define an inner hole 21, and a drainage hole 231 group 23 arranged on the peripheral wall 22 and connected to the guide channel. The peripheral wall 22 has an inner peripheral surface 221 adjacent to the inner hole 21, and a baffle 222 protruding from the inner peripheral surface 221. The inner hole 21 has an inner side area 211 located on one side of the baffle 222 and connected to the drainage hole 231 group 23, and an outer side area 212 located on the other side of the baffle 222. The drainage hole 231 group 23 has a plurality of drainage holes 231 arranged at intervals around the axis L, and each drainage hole 231 extends along a center line L1. The guide channel set 14 is located at the outer periphery of the bearing sleeve 20. The inner side area 211 of the inner hole 21 is connected to the concave hole 117.

The bearing unit 30 is installed in the inner hole 21 of the bearing sleeve 20. The bearing unit 30 has a first bearing 31 disposed in the inner area 211 and located between the retaining ring 222 and the impeller 70, and two second bearings 32 located on the other side of the retaining ring 222.

The shaft 40 extends along the axis L and is installed in the inner hole 21 of the bearing sleeve 20, and includes a driving section 41 corresponding to the drainage hole 231 group 23, a supporting section 42 arranged on one side of the driving section 41 along the axis L and supported by the bearing unit 30, and a mounting hole 43 arranged along the axis L. The driving section 41 has an outer thread 411 with a left thread. The supporting section 42 has a convex ring 421 that stops at one of the second bearings 32. The mounting hole 43 has a push-pull portion 431 corresponding to the supporting section 42 and having a larger outer portion and a smaller inner portion, and a step portion 432 corresponding to the driving section 41.

The collet 50 is installed in the pushing portion 431 of the shaft 40 and has an expandable clamping portion 51 and a screw lock portion 52 which is arranged on one side of the clamping portion 51 along the axis L and is in the shape of a screw hole.

The screw 60 is passed through and positioned in the step portion and is screwed into the screw portion 52 to fix the collet 50 to the shaft 40 .

The impeller 70 is fixed to the driving section 41 of the shaft 40 and is located on one side of the bearing unit 30, and includes a hub 71 extending along the axis L, a disc 72 connected to the hub 71 and adjacent to the first bearing 31, and a plurality of blades 73 corresponding to the drainage hole 231 group 23 and the outlet channel group 14. The hub 71 has a left-threaded threaded hole 711 arranged along the axis L, and the driving section 41 is screwed into the threaded hole 711. The disc 72 intersects the axis L, the center lines L1 substantially intersect the corresponding blades 73, and the recessed hole 117 is adjacent to the blades 73.

The front cover 80 has an outer threaded portion 411 threadedly connected to the inner threaded portion 116, and a plurality of discharge holes 82 connected to the straight groove sections 142. The front cover 80 is closed at the open end 114 of the chamber 110.

In order to further understand the effects of the cooperation of the various components of the present invention, the technical means used, and the expected effects to be achieved, the following description will be given. It is believed that this will provide a deeper and more specific understanding of the present invention.

As shown in Figures 1, 3 and 4, and as indicated by the arrows in Figures 3 and 5, when a driving fluid (air, water or cutting fluid) is input through the introduction section 131 of the introduction channel assembly 13, and is uniformly guided to the lead-out sections 133 by the conductive sections 132, and as shown in Figure 7, when the driving fluid is guided from the connecting holes 134 to the corresponding water storage tanks 135, the volume of any part of the water storage tanks 135 perpendicular to the axis L is greater than the cross-sectional area of any part of the corresponding conductive sections 132 perpendicular to the axis L, thereby generating a stable pressure and a stable flow rate, and improving the stability of driving the impeller 70 to rotate.

Then, as shown by the arrows in FIG. 3 and FIG. 7 , when the driving fluid passes through the corresponding drainage holes 231 from the water storage tanks 135, the central line L1 of each drainage hole 231 substantially intersects with the corresponding blade 73, so that the impeller 70 can be driven to rotate around the axis L. The threaded hole 711 of the impeller 70 is also left-handed, and the driving section 41 of the shaft 40 is screwed into the threaded hole 711. When the impeller 70 drives the shaft 40 to rotate, the screwing relationship between the shaft 40 and the impeller 70 will be locked more and more tightly, and the shaft 40 and the impeller 70 are not easy to loosen.

As shown by the arrows in FIGS. 3 and 7 , after the driving fluid drives the impeller 70 to rotate, the impeller 70 will also send the driving fluid toward the recessed hole 117, and then the water storage effect of the outlet grooves 141 of the outlet channel assembly 14 will be generated. When the driving fluid is guided from the outlet grooves 141 to the corresponding straight groove sections 142, the volume of any part of the outlet groove 141 perpendicular to the axis L is greater than the cross-sectional area of any part of the corresponding straight groove section 142 perpendicular to the axis L, so that a stable discharge effect can be generated.

As shown by the arrows in FIG. 3 , when the driving fluid flows from the straight groove sections 142 toward the front cover 80 , it is discharged through the discharge holes 82 .

The effects that the present invention can produce are summarized as follows:

1. The bearing unit 30 is installed in the inner hole 21 of the bearing sleeve 20, and the bearing sleeve 20 completely separates the guide channel set 13, the guide channel set 14 and the bearing unit 30. Even if the driving fluid is water or cutting fluid, the driving fluid avoids direct impact on the bearing unit 30, and the bearing unit 30 is less likely to be damaged, and the frequency of replacement is lower.

Second, by utilizing the modular design of the bearing sleeve 20, the bearing unit 30, the shaft 40, the collet 50, the screw 60 and the impeller 70, the modular components can be removed from the handle body 10 by simply removing the front cover 80, and some of the modular components can be easily repaired or replaced. Moreover, the bearing unit 30 can be replaced by simply removing the impeller 70 and the shaft 40, which can save time for disassembly and repair.

3. By using the arrangement of the inlet channel set 13 and the outlet channel set 14, water can be stored and drained instantly, which can make the impeller 70 rotate more smoothly. In addition, the number, location and total cross-sectional area of the discharge holes 82 of the front cover 80 can be used to control the output flow rate and avoid excessive drainage. The driving fluid can be used for cooling and chip removal during processing when it is discharged.

Fourth, the conducting sections 132 and the lead-out sections 133 of the guide channel assembly 13 are evenly distributed around the axis L, which can improve the stability of driving the impeller 70 to rotate.

5. The driving fluid after the impeller 70 is driven to rotate is guided through the outlet grooves 141 and the straight groove sections 142 of the outlet channel assembly 14, and finally discharged from the front cover 80. The discharge path of the driving fluid is smooth.

6. The threaded hole 711 of the impeller 70 is a left-hand thread, and the driving section 41 of the shaft 40 is screwed into the threaded hole 711. When the impeller 70 drives the shaft 40 to rotate, the screwing relationship between the shaft 40 and the impeller 70 will become tighter and tighter, and the locking force between the shaft 40 and the impeller 70 is strong and not easy to loosen.

By utilizing the overall configuration, the impeller 70 being fixed to the driving section 41 of the shaft 40 and being located at one side of the bearing unit 30, and the outlet channel assembly 14 being located at the outer periphery of the bearing sleeve 20, the path for discharging the driving fluid does not pass through the bearing unit 30, thereby reducing the damage rate of the bearing unit 30.

In summary, the fluid driving device of the present invention has a simple overall structure and is easy to manufacture and assemble, and can indeed achieve the purpose of the present invention.

However, the above is only an embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. All simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still within the scope of the present patent.

10: handle body 11: cylinder 110: chamber 111: ring wall 112: end wall 113: inner end 114: opening end 115: inner wall surface 116: inner threaded portion 117: recessed hole 12: handle 13: guide channel assembly 131: introduction section 132: conduction section 133: lead-out section 134: connecting hole 135: water storage tank 14: guide channel assembly 141: guide groove 142: straight groove section 20: bearing sleeve 21: inner hole 211: inner area 212: outer area 22: peripheral wall 221: inner peripheral surface 222: stop ring 23: Drainage hole group 231: Drainage hole 30: Bearing unit 31: First bearing 32: Second bearing 40: Shaft 41: Driving section 411: External thread 42: Support section 421: Raised ring 43: Mounting hole 431: Push-pull section 432: Step section 50: Collet 51: Clamp section 52: Screw section 60: Screw 70: Impeller 71: Hub 711: Threaded hole 72: Disc 73: Blade 80: Front cover 81: External thread section 82: Discharge hole L1: Center line L:Axis

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: FIG. 1 is a combined three-dimensional schematic diagram of an embodiment of the driving fluid driving device of the present invention; FIG. 2 is a three-dimensional exploded view of the embodiment; FIG. 3 is a combined cross-sectional view of the embodiment; FIG. 4 is a cross-sectional view along line VI-VI in FIG. 3; FIG. 5 is a cross-sectional view along line V-V in FIG. 3; FIG. 6 is a cross-sectional view along line VI-VI in FIG. 3; and FIG. 7 is a cross-sectional view along line VII-VII in FIG. 3.

10: Handle body

11: Cylinder parts

110: Room

111: Ring wall

112: End wall

114: Open end

115: Inner wall surface

116: Internal thread part

12: Handle

20: Bearing sleeve

21: Inner hole

212: Outer area

22: Peripheral wall

221: Inner Surface

222:Block ring

23: Drainage hole set

231: Drainage hole

30: Bearing unit

31: First bearing

32: Second bearing

40: Shafts

41: Drive section

411: External thread

42: Support section

421: convex ring

43: Mounting hole

431: Pushing and pulling department

50: Collet

51: Clamping part

52: Screw lock part

60: Screws

70: Impeller

71: wheel hub

711:Threaded hole

72: Disk

73:Leaves

80: Front cover

81: External thread part

82: discharge hole

L: axis

Claims (9)

A fluid driving device comprises: A handle body extending along an axis, having an annular wall defining a chamber, an inlet channel group connected from the outside to the chamber, and an outlet channel group connected from the chamber to the outside; A bearing sleeve installed inside the chamber, and comprising a peripheral wall defining an inner hole, and a drainage hole group arranged on the peripheral wall and connected to the inlet channel, the drainage hole group having a plurality of drainage holes arranged at intervals around the axis, each drainage hole extending along a center line, and the outlet channel group located at the outer periphery of the bearing sleeve; A bearing unit installed in the inner hole of the bearing sleeve; A shaft member extending along the axis and mounted in the inner hole of the bearing sleeve, and including a driving section corresponding to the drainage hole group, and a supporting section arranged on one side of the driving section along the axis and supported by the bearing unit; and An impeller fixed to the driving section of the shaft member and located on one side of the bearing unit, and including a plurality of blades corresponding to the drainage hole group and the outlet channel group, wherein the center lines substantially intersect the corresponding blades. A fluid driving device as described in claim 1, wherein the handle body includes a cylinder and a handle connected to the cylinder along the axis, the annular wall is arranged on the cylinder, the cylinder also has an end wall connected to the annular wall, the annular wall and the end wall together define the chamber, the handle intersects and is connected to the end wall, the inlet channel assembly has an introduction section extending along the axis and arranged inside the handle, a plurality of conducting sections arranged on the end wall and connected to the introduction section, and a plurality of outlet sections arranged on the annular wall and connected to the drainage hole. A fluid-driven device as described in claim 2, wherein the conductive sections of the handle body are arranged radially around the axis, each lead-out section has a connecting hole connected to the corresponding conductive section, and a water storage tank connected to the chamber, and the volume of any part of the water storage tank perpendicular to the axis is larger than the cross-sectional area of any part of the conductive section perpendicular to the axis. A fluid drive device as described in claim 3, wherein the annular wall of the handle body has an inner wall surface adjacent to the chamber, the chamber is open in one direction and has an inner side end portion adjacent to the end wall, and an open end portion opposite to the inner side end portion along the axis, the guide channel assembly has a plurality of guide grooves arranged at intervals around the axis and recessed from the inner wall surface, and a plurality of straight groove sections extending from the guide grooves toward the open end portion, and the volume of any portion of the guide groove perpendicular to the axis is greater than the cross-sectional area of any portion of the straight groove section perpendicular to the axis. The fluid driving device as described in claim 4 also includes a front cover connected to the annular wall, the front cover is sealed at the open end of the chamber, and has a plurality of discharge holes connected to the straight groove sections. A fluid-driven device as described in claim 4, wherein the end wall of the handle body has a recessed hole connected to the chamber and the inner hole, the recessed hole is adjacent to the impeller, and the outlet grooves of the outlet channel group are connected to the recessed hole. The fluid drive device as described in claim 1 also includes a collet installed inside the shaft and a screw that fixes the collet to the shaft. A fluid drive device as described in claim 1, wherein the peripheral wall of the bearing sleeve has an inner peripheral surface adjacent to the inner hole, and a baffle protruding from the inner peripheral surface, the inner hole has an inner side area located on one side of the baffle and connected to the drainage hole group, and an outer side area located on the other side of the baffle, the bearing unit has a first bearing arranged in the inner side area and located between the baffle and the impeller, and at least one second bearing located on the other side of the baffle. A fluid drive device as described in claim 8, wherein the impeller further includes a hub extending along the axis and connected to the blades, a disk connected to the hub and the blades and adjacent to the first bearing, the disk intersecting the axis, the hub having a threaded hole arranged along the axis and having a left thread, the drive section of the shaft having an external thread having a left thread, and the drive section being screwed to the impeller.

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