KR20090043314A - Low vibration, light and high power rotating device for portable air tools - Google Patents

Abstract

The present invention is manufactured in a small size by mounting a slim turbine in order to lighten the rotating device of the air tool, but the turbine is operated in a supersonic flow, so that high output is obtained, and in the rotary device for an air tool to operate without vibration during operation. More specifically, the air tool rotary device, such as a pneumatic grinder or a pneumatic drill operated by using air pressure, has been changed from a large-vibration type-low output to a small-low vibration type-high output. The present invention relates to a rotary device comprising a slim supersonic turbine and a nozzle.

The structure of the present invention is composed of a handle holder 55 having a high-pressure air supply passage and a rotating device for rotating a tool such as a grinder by using the supplied high-pressure air, the housing 51 constituting an outer portion of the rotating device Rotating shaft 40 is installed on the rotor shaft 40, the rotor blade block 49 and the stator blade block 50 are installed at the lower end of the rotary shaft 40, and the nozzle block 63 is installed around the stator blade 50. The nozzle block (63) is radially installed in the nozzle block (63), and pneumatic air supplied from the pneumatic connector (57) is injected from the injection nozzle (53) to rotate the rotor blades. In order to improve the output, the rotor serves to adjust the flow path of the air so that it can be operated in two stages, and the rotor stage 1 60 is configured to operate at supersonic speed to obtain a high output, the air of expanded high pressure To get more output from 2 The rotor blade 61 is a subsonic turbine blade type, in particular, a radial turbine is installed so that the nozzle is sprayed radially enough to operate enough if the height of the rotor blade is about 6mm, and when the rotational force is obtained from the injected air, connected to the rotor blades The grinder 46 is rotated and configured to enable desired processing, and the rotor block and the stator block are made of a shape and a structure that can be manufactured by die casting, and are made of a shape that achieves light weight and low vibration and high power.

Slim turbine, rotary device, air tool, pneumatic, low vibration, light weight, high power, supersonic turbine

Description

Low vibration, light and high power rotating device for portable air tools}

The present invention allows the rotary shaft device of the air tool to achieve a small size, light weight and high power, to operate at low vibration, and to be manufactured at a low cost by making a complicated rotor blade or stator blade by a simple manufacturing process such as die casting. More specifically, air tools such as pneumatic grinders or pneumatic drills that operate using air pressure have been changed from large-vibration-low power to small-low vibration-high power, Turbine is a low vibration light weight high-power air tool rotary device applied for air tools equipped with ultra-slim turbines that exhibit sufficient performance if the height of about 6mm.

In general, air tools are used to rotate a rotating device using high pressure air supplied and attach various tools such as grinders, drills, wrenches, drivers, sanders, rotary tools, and the like to be used for various processing operations. Collectively the tools.

1 is a cross-sectional view of a conventional air tool, and when high pressure air is injected through the high pressure air inlet 1, the cover 5 and the right sealing plate 6 and the cylinder 7 are connected to each other through the valve 2. The high pressure air is injected through the air hole 15, and the injected high pressure air enters the lower portion of the rotor groove 8 in which the vane groove 9 is dug and is mounted to the vane groove. In the radial direction to bring the vanes 14 into close contact with the cylinders 7, while at the same time high pressure air enters the space between the cylinders 7 and the rotors 8, to the vanes 14 closely contacted with the cylinders. Force is applied to rotate the rotor 8.

At this time, the rotational force is transmitted to the driving bevel gear 10, and the rotational force rotates the driven bevel gear 11 and the retracted grinder 22 so as to transmit the force at a right angle, so that the work is possible, and the grinder 22 ) Can be replaced with various tools depending on the purpose of use.

In addition, when the maximum rotational speed control member 4 reaches the maximum speed, the valve 2 pushes the valve 2 to bypass the high pressure air to the high-pressure air outlet 3, and the rotor bearings 17 and 18 and the rotating shaft bearing ( 19, 20, the nut 21, the grinder cover 12, the plate 24, and the sealing plates 6, 23 which serve as the housing of the left and right bearings and the air sealing.

FIG. 2 is a side cross-sectional view of the rotor portion of the cylinder cut along the line AA of FIG. 1, and the vane groove 9 outside the casing 16, the air hole 15, and the rotor 8. The vane 14 mounted on the) is configured to be in close contact with the cylinder wall by the centrifugal force and the force of the high pressure air introduced into the lower part of the vane groove, and at the same time, the pneumatic pressure injected into the inner space of the cylinder 7 and the rotor 8 is Since the vane 14 is pressurized, the rotor 8 is provided with a rotational force, and the air having finished rotating the vane is discharged out through the air outlet 13 of the cylinder 7 which is dug on the right wall of the cylinder 7. A cylinder 7 structure is provided to allow the intake and discharge of air, and referring to FIG. 2, the rotation of the rotor 8 is configured to rotate counterclockwise.

However, the problem with the conventional air tool rotating device is that the vane rotor has a large shape, so there is a space constraint to install it, so that the operator installs it in the handle 16 that holds the tool. After changing the rotational force generated by the bevel gear to 90 degrees and attaching the machining tool to the subordinate rotating shaft, when the worker grabs the handle holder 16 and works, the inside of the handle holder 16 Due to the operation of the vane rotor rotating in the part, a large vibration is felt. Especially, because of the eccentric rotating body which amplifies the vibration even more, it is not possible to work for a long time. In order for the material of the rotor 8 and the cylinder 7 to be applied to a material of high weight, such as stainless steel, the weight of the air tool becomes larger and more difficult for various operations and long time operations.

In addition, conventionally, the inner diameter of the cylinder (7) and the rotor (8) to make an eccentric contact between the rotor and the cylinder to one side so that the pressurized air to operate only the vane 14, as shown in the upper portion of FIG. However, contacting one part of the cylinder 7 and the rotor 8 is a very difficult problem. Since the rotor is a rotating object and the cylinder is a stationary object, the rotor may rotate only after a slight interval. In this case, not only acting on the vane of the injected high-pressure air, but also some of the exiting in the opposite direction to act the vane, causing a decrease in efficiency, while the cylinder (7) and the rotor (8) tightly adhere If possible, there is a problem that the rotor is difficult to rotate, in addition to the high-pressure air injected when the cylinder 7 and the vane 14 are in close contact It does not escape, but this causes a lot of power to rotate the rotor to overcome the frictional losses of the vanes 14 and cylinders 7 as well as the rapid wear on the cylinders 7 and vane ends, On the contrary, when the cylinder 7 and the vane 14 are loosely adhered, friction loss is reduced, but the air to be pressurized is forced out through the contact portion to exert a force on the opposite side of the vane, thereby reducing efficiency and reducing torque. In addition, even if initially assembled to optimally operate the adhesion between the vane and the cylinder, wear occurs between the vanes 14 and the cylinder 7 according to the use time, so that the cylinder 7 and the rotor ( 8) There is a problem that the rotation device must be replaced after a certain time by increasing the interval with.

Therefore, the present invention has been invented to solve the above problems, by changing the air tool from high vibration to low vibration to improve the work efficiency of the operator, and also because the turbine is used instead of vanes, friction between the cylinder and the rotor occurs Therefore, even if it is used for a long time, efficiency reduction or torque reduction does not occur, and instead of a large vane, a slim turbine is adopted so that the turbine operates at supersonic speed so as not to decrease the output while reducing the weight dramatically. The first stage rotor 60 is in the shape of a supersonic turbine, and the second stage turbine 61 is configured in the form of a subsonic turbine to obtain more output because the high pressure air operated by the first stage turbine expands at the first stage outlet. In order to reduce vibration, the handle portion is simply installed with an air supply line 58 to prevent vibration. It is an object of the present invention to provide a rotary device of a low vibration light weight high power air tool, which is greatly reduced so that there is no difficulty for the operator to perform various tasks and a long time.

In order to achieve the above object, the present invention, in the air tool for rotating the rotation means in a tool such as a grinder using a handle holder and a high pressure air supplied with a high-pressure air supply passage,

A rotor shaft is installed in the housing, and a vane block having a vane attached to the lower end of the rotary shaft to change the direction of the air flow path is provided, and a lower portion of the rotary shaft is generated by the high pressure air injected from the injection nozzle provided in the vane block. It provides a rotor block having a rotor blade is attached to, and a low vibration light weight high power air tool rotating structure having a structure to operate by attaching a grinder on one side of the rotor block.

And the present invention preferably has a slim structure by installing a nozzle block on the outer peripheral surface of the stator block, the rotor block has a turbine blade type of the supersonic type of the first stage rotor, turbine blade type of the subsonic type two stages It provides a rotary device for a low vibration light weight high power air tool, characterized in that consisting of.

In another aspect, the present invention preferably provides a rotor device for a low vibration light weight high power air tool, characterized in that the rotor blades and the vanes of the vane block is installed in the same direction as the rotation axis.

And the present invention is preferably the rotor block is mounted on a rotating shaft, the handle holder for the operation is only built in the pneumatic injection pipe of the high-pressure air is characterized in that the handle holder is made to be deformable from straight to ergonomic form Low vibration Light weight High power rotary air tool.

In addition, the present invention preferably the housing is equipped with a silencer before the air outlet is installed on the circumference for operating the rotor blades to discharge the air coming out, low vibration light weight high power air tool, characterized in that made possible to enable Provide a rotating device.

In addition, the present invention is to remove the part to be rotated by the vane and to rotate it by the slim turbine, the attachment position of the turbine moved to the part having a rotating shaft to which the tool (tool) is attached, which is due to the handle holder The rotor is eliminated, so that the operator does not directly feel the vibration generated from the handle holder part, and the handle part is not only used as a tube and a simple handle to maintain the flow of high pressure air but also ergonomically considering the convenience of the operator to the maximum. The material of the handle is made of engineering plastic and rubber, and the vibration generated from the rotating body is canceled in the process of being transmitted to the handle to realize light weight and low vibration, and the rotating body part is a slim turbine. Changed to This results in a low-vibration, lightweight high-power air tool rotating device that reduces tool weight and allows the turbine's first stage to operate at supersonic speed and the second stage to subsonic speed, resulting in increased power and torque and improved efficiency. .

According to the rotary device for a low vibration light weight high power air tool according to the present invention, when using the existing vane type, there is a rotational body in the handle part, so it is difficult to work for a long time due to the strong vibration transmitted to the worker's hand. The entire portion is moved from the handle portion to the rotation shaft position so that vibration generated in the rotating body is not transmitted directly.

In addition, the vibration generated from the rotation shaft is attenuated in the process of being transmitted to the handle holder portion, thereby reducing the vibration transmitted to the operator to achieve a low vibration air tool, and the heavy-weight vane rotor in the handle holder portion is replaced by a slim turbine. In addition, since the turbine is not directly friction with other fixed objects, the reduction of efficiency and torque does not occur, and the replacement time of components due to the wear of cylinder or vane is remarkable. In the existing product, there was a difficulty in adjusting the gap between the cylinder and the rotor in the initial assembly, but in the present invention, such a problem is automatically solved and the productivity is improved, so that the tool industry using the rotating device Very useful inventor A.

Hereinafter, with reference to the accompanying drawings showing a preferred embodiment of the configuration of the present invention will be described in detail.

First, the characteristic structure of the present invention is as follows.

The rotary device for a low vibration light weight high power air tool according to the present invention comprises a handle holder 55 having a high pressure air supply passage and a rotating device for rotating a tool such as a grinder using the supplied high pressure air. The rotating shaft 40 is provided in the housing 51 which comprises an outer part, the rotor blade 49 and the stator blade 50 are installed in the lower end of this rotating shaft 40, and a nozzle is formed around the stator block 50. A block 63 is installed, and the injection nozzle 53 is radially installed in the nozzle block 63, and pneumatic air supplied from the pneumatic connector 57 is injected from the injection nozzle 53 to provide a rotor blade. The rotor is to rotate, the wing serves to adjust the flow path of the air so that the rotor can be operated in two stages in order to improve the output of the rotor, the rotor block 49 and the grinder 46 as shown on the rotary shaft 40 It is assembled and the rotor's turning force is grinder It is made to pass.

A nozzle block 63 is installed around the vane block 50 to inject high pressure air into the injection nozzle 53 in the nozzle block, and to rotate the high pressure air to the injection nozzle. The high pressure air is supplied through the air passage on the wall of the housing 51 which surrounds the housing 51, and then is configured to be connected to the inlet of the nozzle through the upper surface of the stator blade block. Considering the proper rotational speed, the nozzle's spray angle is installed to match the turbine's air flow path to rotate the rotor block 49 at a constant speed. The rotor block is rotated and the discharged air is discharged to the upper part of the rotor blade. It is discharged through the air outlet 45 in the housing, but passes through the silencer 48 before being discharged, and is configured to reduce noise during operation. There.

Thus, the rotor block 49 for rotating the grinder is only installed at the end of the rotary shaft 40 in the housing 51, the grinder 46 is attached to the lower surface of the rotor block 49, the handle holder In the 55, only the high-pressure air supply injection pipe 58 is built-in, so that the handle holder 55 does not vibrate violently as in the conventional air tool, and in the conventional method, the handle portion is provided with a vane. It is a space for the user, but it was difficult to use other than the straight form, but in the new method, the handle part can be manufactured in an ergonomic form so as not to make the worker tired, and in order to reduce the vibration transmitted from the rotating body, Since the combination of engineering plastic and rubber is made, the amount of vibration generated from the rotor during operation is transmitted to the worker. It is configured to be a low vibration rotating device to absorb from the handle.

Next, the present invention will be described in more detail, Figure 3 is a cross-sectional view of a rotary device for an air tool of the preferred embodiment according to the present invention, the pneumatic connector 57 for high-pressure air injection when compared to the conventional air tool handle holder 55 At the end of the handle holder 55 to operate the rotor blades 61 and 62 through the injection tube 58 of the high pressure air in the handle holder 55 through the supply passage at the top of the housing and the stator blades with the injection nozzle 53. Air is supplied, and the high pressure air introduced into the space is injected into the first stage rotor 60 of the rotor block 49, and the injected high pressure air is supplied to the first stage vane 62 installed in the stator block 50. By changing the direction of the flow is to rotate the rotor blade 61 of the two-stage rotor blade 49, this rotational force is transmitted to the rotary shaft 40 to obtain a rotational force.

In particular, the first stage rotor 60 is designed to operate at supersonic speed, in order to expand the air supplied at high pressure to obtain a high velocity so that sufficient energy conversion occurs in the turbine, and the supersonic speed obtained at the outlet of the nozzle The flow is designed to prevent energy loss of high pressure air due to the loss of shock waves in the turbine. Since the nozzles are symmetrical or several, the rotors are sufficiently performance even if the height of the rotor is less than 6mm. Since it is thin, it is composed of a slim turbine, and the rotating device in the present invention is configured to be assembled into the grinder cover 12 of the conventional air tool rotating device.

And, the grinder 46 for processing is attached to the end of the rotating shaft 40 to which the rotating body is attached, but the support part of the grinder than the conventional apparatus because it is attached in contact with one side of the rotor block 49 This significantly increases the stability of the grinder even when the work is tilted or pressed with a large force during the work is significantly increased, so that there is no difficulty in operations such as special processing or chamfering, the support of the rotating shaft 40 It is supported by the shaft bearings 41 and 42 in the housing, and since the rotating shaft 40 does not have the conventional bevel gear 11 attached, assembly is simplified and only the rotor block 49 rotates so that the entire rotating body is rotated. It is made to significantly reduce the weight of.

FIG. 4 is a plan view of FIG. 3, which illustrates that one side of the housing 51 and the handle holder 55 are assembled by bolts, and an auxiliary handle 59 may be installed on the side of the housing for the convenience of the operator. This auxiliary handle can be used to move left and right according to the convenience of the operator, the cover 52 for the safety of the work is assembled by bolts to the nozzle block 63 is attached to the stator block (50) It consists of a structure.

Figure 5a shows in detail the shape of the entire cross-section of the rotor block 49 according to the present invention, the first stage rotor 61 is installed on the outside of the turbine and the second stage rotor 61 is installed inside Turbine blade is installed, and the injection nozzle 53 is installed so as to match the relative blade angle considering the rotational speed of the first stage rotor 61 so that sufficient output is obtained from the turbine. Gradual expansion is made on the pressure and suction surfaces of the valve, and is composed of a shape consistent with the reflected waves generated at the pressure and suction surfaces, so that the loss of shock waves in the flow path of the rotor is minimized. The air discharged after operating (60) is changed to subsonic speed after the partial injection operation at the outlet, so to achieve high efficiency according to this, two stages with subsonic airfoils The rotor blade 61 is designed, and the air flow path is changed from the stator blade 62 to efficiently operate the two-stage turbine, and the first-stage rotor blade 60, the two-stage rotor blade 61 and the first-stage blade rotor 62 5b, 6b is shown in detail, the operation air passing the two-stage rotor blade is formed in the inner portion of the rotor block is circular, changing the air flow path discharged from the turbine outlet to guide the air to the upper portion of the rotor blade It is composed of shapes to make it possible.

FIG. 5B shows a plan view of FIG. 5A as a part showing the shapes of the first stage rotor 60 and the second stage rotor 61 of the rotor block 49 of FIG. 5A, and the first stage rotor 60 and the second stage rotor blade. (61) shows a significant difference in the shape of the airfoil, and a supersonic wing mold capable of receiving a large amount of torque is installed at the edge of the rotor block, and the second stage rotor has an inlet to receive high torque from the flow formed at the stator outlet. It is installed so that energy is converted from the flow of air by giving sufficient angle of incidence to the angle, and the shape of airfoil cross section is complicated, but it is installed in the same direction as the axis of rotation so that it can be manufactured by die casting, so that the cost can be reduced during manufacturing. Consists of

On the other hand, Figure 6a shows the shape of the vane block 50 portion of the slim turbine according to the present invention, the outer peripheral portion of the vane block is manufactured in the form that the nozzle block 63 is attached, the nozzle block is sprayed The nozzle 53 is processed, and the shape of the nozzle is maintained in a straight line so that the high pressure is maintained at the outlet of the nozzle while expanding at supersonic speed, which is higher than that of the supersonic nozzle forming a supersonic speed at the nozzle. It is not only a structure that has the advantage of delivering to the turbine, but also has the advantage that it can be easily manufactured. In addition, the spray nozzle is radially installed to increase the operational stability of the rotating body and to be left to right balanced.

6b shows the shape of the vane block attached to the vane block 50 and the shape of the injection nozzle in a shape when the vane block is viewed from below, and the first stage vane 62 attached to the vane block 50. The shape allows the injection air, which is operated at the first stage rotor 60 and still maintains the high speed, to be injected into the second stage rotor 61 using the stator blade 62 to obtain additional power to the power obtained at the first stage. Since the inlet angle and the outlet angle of the two-stage rotor blade 61 are directly related to the torque, the two-stage rotor blade 61 may be formed based on the flow path at the outlet of the first-stage rotor blade 60 from the stator blade 62. It has a shape to form the inlet flow path of the well enough, it is made to install the stator blades in the same direction as the axis of rotation to produce the stator block 50 by die casting.

Finally, the rotating body according to the present invention, which makes a rotary motion with a two-stage slim turbine, is characterized by no reduction in torque due to friction, simple assembly, and a significant reduction in the number of parts. Rotating device of a low vibration light weight high efficiency air tool is only to help the overall understanding of the present invention, it is to be understood that such specific matters may be changed or changed within the scope of the present invention. It is obvious to those who have it.

1 is a cross-sectional view of a conventional air tool,

Figure 2 is an enlarged side cross-sectional view of the cylinder and the rotor cut the line A-A of Figure 1,

3 is a cross-sectional view of an air tool equipped with a slim turbine showing a preferred embodiment of the present invention;

Figure 4 is a plan view of the air tool of Figure 3 showing a preferred embodiment of the present invention,

Figure 5a is a side view showing the overall shape of the turbine rotor blade block of the present invention,

5B is a plan view showing the overall shape of the turbine rotor blade block seen from B of FIG. 5A;

Figure 6a is a side view showing the overall shape of the turbine stator block of the present invention,

FIG. 6B is a plan view showing the overall shape of the turbine stator block as seen in FIG. 6A.

<Description of Symbols for Major Parts of Drawings>

1: high pressure air inlet, 2: valve,

3: high pressure air outlet, 4: maximum rotational speed member,

5: high pressure air inlet cover, 6: right sealing plate,

7: cylinder, 8: rotor,

9: vane groove, 10, 11: bevel gear,

12 grinder cover, 13 air outlet,

14: vane, 15: air hole,

16: handle holder, casing 17, 18: rotor bearing,

19, 20: rotating shaft bearing, 21: nut,

22 grinder, 23 left sealing plate

24: plate,

40: rotating shaft, 41, 42: shaft bearing,

43: oil seal, 44: seal fixing ring,

45: air outlet, 46: grinder,

47: tightening screw, 48: silencer,

49: rotor blade block 50: stator block,

51: housing, 52: cover,

53: injection nozzle, 54: oil chamber,

55: handle holder, 56: bolt,

57: pneumatic connector, 58: pneumatic injection pipe,

59: auxiliary handle 60: first stage rotor blade,

61: two-stage rotor blades, 62: single-stage stator blades,

63: nozzle block,

Claims (5)

In the air tool for rotating the rotating means in a tool such as a grinder by using a handle holder having a high pressure air supply passage and supplied high pressure air, A rotary shaft 40 is installed in the housing 51, and a vane block 50 having a vane attached to the lower end of the rotary shaft to change the air flow direction is installed, and a lower portion thereof is provided at the vane block 50. The rotor block 49 is installed with a rotor blade that generates rotational force by the high pressure air injected from the injection nozzle 53, and has a structure that operates by attaching a grinder 46 to one side of the rotor block. Rotating device for air tools with low vibration and light weight. According to claim 1, wherein the vane block 50 has a slim structure by installing the nozzle block 63 on the outer peripheral surface, the rotor block 49 is a single-stage rotor 59 is a supersonic turbine blade type It has a two-stage rotor blade 60 is a rotary device for a low vibration light weight high power air tool, characterized in that consisting of a subsonic turbine blade type. The rotor of claim 1, wherein the rotor blades (49) and the rotor blades (50) of the vane block (50) are installed in the same direction as the rotary shaft (40). According to claim 1, wherein the rotor blade block 49 is mounted on the rotating shaft 40, the handle holder 55 for the operation is built in the pneumatic injection pipe 58 of the high-pressure air so that the handle holder 55 is straight Low vibration light weight high power rotary air tool rotating device characterized in that it is made to be transformed into an ergonomic form. The low vibration and light weight of claim 1, wherein the housing is provided with a silencer 48 before the air outlet 45 installed at the circumference to operate the rotor blades and to discharge the air. Rotating device for high power air tools.

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