A pneumatic tool

Abstract

The present invention discloses a pneumatic tool, comprising a housing, a gas power device and a tool group, wherein the gas power device and the tool group are both arranged on the housing, and the tool group is drivingly connected to the gas power device; the gas power device comprises: an outer ring, whose inner ring surface is circumferentially provided with a plurality of driving recesses; a core body, which is coaxially arranged in the outer ring and can rotate relative to the outer ring, and the outer ring surface of the core body is provided with at least one nozzle, at least one outlet, and at least one flushing channel between the nozzle and the outlet; at least one air inlet channel, which is connected to at least one nozzle; and at least one exhaust channel, which is connected to at least one outlet. Compared with electric tools, the pneumatic tool of the present invention has the advantage of insulation to prevent accidental electric shock, and is suitable for underwater and other occasions.

Description

Technical Field

[0001] The invention belongs to the technical field of pneumatic maintenance tools and pneumatic engineering tools, and in particular relates to a pneumatic tool. Background Art

[0002] Pneumatic tools are mainly tools that use compressed air to drive pneumatic motors to output kinetic energy. They mainly include air guns, pneumatic screwdrivers, pneumatic grinders, pneumatic spray guns, pneumatic rivet guns, pneumatic cap guns, air shovels, air hammers, shock-absorbing pneumatic saws, shock-absorbing pneumatic files, etc. There are rotary types (eccentric movable blade type) and reciprocating types (displacement piston type).

[0003] The existing pneumatic tools can refer to the Chinese Taiwan Patent No. M261334 or I259865, which are connected to a high-pressure gas source, input high-pressure gas to drive the spindle in the pneumatic motor to rotate, and then connect the spindle to a pneumatic striking tool to drive the striking tool to rotate, so as to use the striking tool to rotate other tools or workpieces. The spindle is used to drive the striking tool to rotate, and there are meshing spline teeth between the spindle and the striking tool, so that the power of the spindle can be used to drive the striking tool to rotate. However, there is a large gap in the connection of the spline teeth, which makes it difficult to completely connect the spindle and the striking tool. After the striking tool is driven by the spindle to rotate, it often shakes arbitrarily in the radial direction of the spindle, causing the striking tool to be unstable in working state, generating great vibration and noise, and even colliding with the spindle and the shell, reducing the service life of the pneumatic tool. However, the existing pneumatic tools still have the disadvantage of low gas utilization. Summary of the invention

[0004] The problem to be solved by the present invention is that the gas utilization rate of existing pneumatic tools is low.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The present invention provides a pneumatic tool, comprising a housing, a gas power device and a tool set, wherein the tool set is drivingly connected to the gas power device; the gas power device comprises:

[0007] An outer ring, whose inner ring surface is provided with a plurality of driving recesses in the circumferential direction;

[0008] A core body is coaxially arranged in the outer ring and can rotate relative to the outer ring, and the outer ring surface of the core body is provided with at least one nozzle, at least one discharge port, and at least one flushing channel located between the nozzle and the discharge port;

[0009] at least one air inlet passage connected to at least one nozzle;

[0010] and at least one exhaust passage communicating with at least one exhaust port;

[0011] The gas enters from the air inlet channel, is ejected step by step through the nozzle of the core body and the secondary flow channel, and acts on at least two driving recesses on the circumference of the outer ring, generating thrust for these driving recesses to drive the outer ring to rotate and do work. Finally, the gas is discharged through the exhaust port of the core body through the exhaust channel, realizing power output and acting on the tool group, making it perform functional operations.

[0012] Furthermore, at least one air inlet channel, at least one nozzle, at least two driving recesses, at least one primary flow channel, at least one discharge port and at least one exhaust channel form an independent working unit, and the gas power device includes at least one independent working unit.

[0013] Furthermore, the nozzles and secondary flow channels on the core body are connected to the driving recesses corresponding to the outer ring. The secondary flow channels are arranged alternately and connected in sequence with the corresponding driving recesses. The secondary flow channels are arranged circumferentially along the core body or the outer ring.

[0014] Further, an intake passage and an exhaust passage are formed in the core.

[0015] Furthermore, the core body includes: an air inlet channel, which forms a nozzle on the peripheral surface of the core body, and its direction is an arc line extending from the middle to the outside, and the nozzle is connected with the driving concave portion corresponding to the outer ring to form a first-stage flow channel;

[0016] The secondary flow channel is an arc line extending from the edge of the core body inward and then bending to the edge. Each secondary flow channel is connected with the front and rear driving recesses corresponding to the outer ring, forming N-step flow channels along the circumference of the core body, where N is a natural number ≥ 2;

[0017] Each step of the flow channel cooperates with the corresponding driving recess of the outer ring to form a multi-step stroke structure with decreasing gas energy.

[0018] Furthermore, the secondary flow channel includes a return channel and a communicating stroke channel, the return channel is communicated with a driving recess corresponding to the outer ring, and the stroke channel is communicated with another driving recess.

[0019] Furthermore, the direction of the core air inlet channel is a logarithmic spiral extending from the middle to the outside, the pole of the logarithmic spiral is set on the central axis of the core, and the direction angle of the logarithmic spiral is 15°-45°.

[0020] Furthermore, an air inlet channel is provided on the core body, and its direction is a logarithmic spiral extending from the middle to the outside, and the direction of the stroke channel of the secondary flow channel is a logarithmic spiral. The direction of the logarithmic spiral of the stroke channel of the secondary flow channel is roughly the same as the direction of the logarithmic spiral of the air inlet channel.

[0021] Furthermore, the gas power device also includes a shaft, and the outer ring and the core body are coaxially arranged on the shaft.

[0022] Furthermore, the gas power device also includes a shaft, the outer ring is coaxially arranged on the shaft with the core body, and the shaft is provided with inlet and outlet shaft channels respectively connected to the inlet channel and exhaust channel of the core body. The inlet and outlet shaft channels in the shaft form an inlet port and an outlet port, and the inlet and outlet shaft channels are non-connected structures.

[0023] Furthermore, the outer ring is matched with the shaft through the side plates to form a closed space, and the core body is arranged in the closed space and is connected and fixed to the shaft.

[0024] Furthermore, the air inlet channel, the nozzle, the driving recess, the secondary flow channel, the exhaust port and the exhaust channel in the independent working unit constitute a gas flow path.

[0025] Furthermore, the gas power device includes more than two independent working units to form a multi-stage driving structure, and is arranged along the circumference of the core or the outer ring.

[0026] Furthermore, more than two driving recesses are arranged on the inner ring surface of the outer ring, and each driving recess has a contour bottom surface and a driving surface. The contour line of the contour bottom surface is a logarithmic spiral line, and its pole is arranged at the center of the core body.

[0027] Furthermore, a gas pressure engine comprises the gas power device, wherein the gas is compressed gas or gas with a certain pressure.

[0028] Furthermore, a continuously variable transmission comprises the gas power device.

[0029] The gas power device of the present invention has a simple structure, large torque, high rotation speed, high transmission efficiency and low energy consumption, and can be widely used in vehicles, power generation equipment and other fields requiring power output devices.

[0030] Furthermore, the shell is surrounded by an air inlet groove, a first chamber, and a second chamber. The gas power device is accommodated in the first chamber, and the tool group is rotatably accommodated in the second chamber. The first chamber is connected to the air inlet groove and the second chamber. A control valve group is also provided on the air inlet groove, and the control valve group is connected to a high-pressure gas source. The control valve group controls the gas from the high-pressure gas source to enter the air inlet groove.

[0031] Furthermore, it also includes a shielding body, which is detachably connected to the top of the shell and forms an exhaust groove with the shell, the exhaust groove is connected to the first chamber, and an exhaust port connected to the exhaust groove is formed at one end of the shielding body, so that the gas exhausted from the shell can be guided to a predetermined direction through the shielding body above the shell and discharged to the external space.

[0032] The present invention adopts the above technical solution and has the following beneficial effects:

[0033] 1. Compared with electric tools, the pneumatic tool of the present invention has the advantage of being insulated to prevent accidental electric shock, and is suitable for underwater and other occasions.

[0034] 2. The core body of the present invention is provided with multiple-stage flow channels, i.e., the air intake channel is used as the first-stage flow channel, and each secondary flow channel is used as the second, third, fourth...stage flow channel. The gas acts on the driving recess of the outer ring from the first-stage flow channel, the driving recess is connected to the second-stage flow channel, and then returns to the second-stage flow channel and acts on another driving recess of the outer ring, and so on, until the gas is discharged from the exhaust channel. The whole process is carried out in the forward direction of the outer ring rotation direction, with large torque, high transmission efficiency, high gas utilization rate, and the output torque further increases with the increase of rotation speed.

[0035] 3. The flow channels arranged circumferentially on the core of the present invention effectively reduce the volume of the overall device and can be flexibly matched with power generation or output equipment in various fields. At the same time, the more inlet flow channels are arranged on the core, the lower the overall weight is, which further improves the output speed and efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a perspective view of the first embodiment of the present invention.

[0037] Figure 2 It is a partial exploded view of the first embodiment of the present invention.

[0038] Figure 3 It is a schematic diagram of the gas power device according to the first embodiment of the present invention.

[0039] Figure 4 It is a side view along the axis A of the gas power device of the first embodiment of the present invention.

[0040] Figure 5 It is a side view of the gas power device of the first embodiment of the present invention along the axis B.

[0041] Figure 6 It is a cross-sectional view of the gas power device according to the first embodiment of the present invention.

[0042] Figure 7 This is another layout diagram of the gas power device according to the first embodiment of the present invention.

[0043] Figure 8 It is a schematic diagram of the gas power device according to the second embodiment of the present invention.

[0044] Fig. 9 It is a side view along axis C of the gas power device of the second embodiment of the present invention.

[0045] Fig.10 It is a side view along the axis D of the gas power device of the second embodiment of the present invention.

[0046] Fig.11 It is a radial cross-sectional view of the gas power device according to the second embodiment of the present invention. DETAILED DESCRIPTION

[0047] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0048] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0049] Embodiment 1:

[0050] See also Figures 1 to 6 The present embodiment provides a pneumatic tool, comprising a housing 5, a gas power device and a tool group 6, wherein the tool group 6 is drivingly connected to the gas power device (in the present embodiment, the outer ring of the gas power device can be directly drivingly connected to the rotating shaft of the tool group 6 via a flange).

[0051] like Figure 2 As shown, the housing 5 can be formed by combining a first shell 51 and a second shell 52, so that the housing 5 is surrounded by an air inlet groove 53, a first chamber 54, and a second chamber. The gas power device is accommodated in the first chamber 54, and the tool group 6 is rotatably accommodated in the second chamber. The first chamber 54 is connected to the air inlet groove 53 and the second chamber. A control valve group is also arranged on the air inlet groove 53, and the control valve group is connected to a high-pressure gas source. The control valve group controls the high-pressure gas from the high-pressure gas source to enter the air inlet groove 53. Among them, the control valve group 8 includes a trigger group 81 and a flow control valve 82 for the user to operate.

[0052] like Figure 1-Figure 2As shown, it also includes a shielding body 7, which is detachably connected to the top of the shell 5 and mutually forms an exhaust groove 71 with the shell 5 (the exhaust groove 71 is formed by a shielding body 7 arranged on the top of the second shell 52 and the second shell 52, and the exhaust groove 71 is connected to the first chamber 54. To be more specific, the exhaust groove 71 is located on the side of the first chamber 54 away from the air inlet groove 53, and the shielding body 7 forms an open exhaust port toward the first shell 51, which is connected to the exhaust groove 71, and the line between the exhaust groove 71 and the air inlet groove 53 defines a vertical direction), the exhaust groove 71 is connected to the first chamber 54, and one end of the shielding body 7 is formed with an exhaust port connected to the exhaust groove 71, so that the high-pressure gas discharged from the shell 5 can be guided to a predetermined direction through the shielding body 7 above the shell 5 and discharged to the external space.

[0053] In this embodiment, the tool group 6 and the gas power device can also be connected by a driving mechanism. Specifically, the gas power device can receive the input high-pressure gas from the air inlet groove 53, and use the high-pressure gas to drive the outer ring of the gas power device to rotate. The outer ring of the gas power device then drives the rotating shaft of the tool group 6 to rotate through the transmission mechanism to drive the tool group 6 to work. The transmission mechanism in this embodiment can be a belt transmission mechanism or a chain transmission mechanism, etc., but is not limited to this. It can also be any other conventional transmission mechanism, which will not be described in detail here. The tool group listed in this embodiment is a rotary type, but is not limited to this. Those skilled in the art can use existing technology to cooperate the gas power device with an existing reciprocating (volumetric piston) tool group to work, which will not be described in detail here.

[0054] The tool set 6 of this embodiment can be in various forms, for example: pneumatic wrench, pneumatic lifter, pneumatic drill, pneumatic punch, pneumatic hammer, pneumatic screwdriver, pneumatic cutter, pneumatic grinder, pneumatic spray gun, pneumatic rivet gun, pneumatic cap gun, air shovel, pneumatic file, etc.

[0055] The gas dynamic device comprises an outer ring 1, whose inner ring surface is provided with a plurality of driving recesses 11 on the circumference; a core body 3, which is coaxially arranged in the outer ring 1 and can rotate relative to the outer ring, and the outer ring surface of the core body 3 is provided with at least one nozzle 301, at least one discharge port 302, and at least one primary flow channel 300 located between the nozzle and the discharge port;

[0056] At least one air inlet passage 31 connected to at least one nozzle 301; and

[0057] at least one exhaust passage 310 connected to at least one exhaust port 302;

[0058] The gas enters from the air inlet channel 31, and is ejected step by step through the nozzle 301 of the core body 3 and the secondary flushing channel 300, acting on at least two driving recesses 11 on the circumference of the outer ring 1, generating thrust on these driving recesses 11 to drive the outer ring 1 to rotate and do work, realizing continuous power output, and finally, the gas is discharged through the exhaust channel through the exhaust port of the core body 3. The power output of the gas power device 1 acts on the tool group to perform functional operations, and the functional operations are different according to the different forms of the working group. The gas power device also includes a shaft 2, and the outer ring 1 and the core body 3 are coaxially arranged on the shaft 2.

[0059] like Figure 6 As shown, the air inlet channel 31 and the exhaust channel 310 are formed in the core body 3, and the nozzle 301 and the secondary flow channel 300 on the core body 3 are connected with the driving recess 11 corresponding to the outer ring 1, wherein the secondary flow channel 300 and the corresponding driving recess 11 are arranged alternately and connected in sequence, and the secondary flow channel 300 is arranged along the circumference of the core body or the outer ring.

[0060] like Figure 6 The core 3 includes: an air inlet channel 31, which forms a nozzle 31 on the peripheral surface of the core, and its direction is an arc line extending from the middle to the outside, and the nozzle 301 is connected with the driving recess 11 corresponding to the outer ring to form a first-stage flow channel;

[0061] The secondary flushing channel 300 is an arc line extending from the edge of the core 3 inward and then bending to the edge. Each flushing channel 300 is connected with the front and rear driving recesses 11 corresponding to the outer ring 1, forming N-stage flow channels along the circumference of the core, where N is a natural number ≥ 2. It should be noted that if it is a 2-stage flow channel, it includes the 1st stage flow channel (inlet channel) and the 2nd stage flow channel (primary flushing channel); if it is a 3-stage flow channel, it includes the 1st stage flow channel (inlet channel), the 2nd stage flow channel (primary flushing channel), the 3rd stage flow channel (another secondary flushing channel), ...

[0062] Each step of the flow channel cooperates with the corresponding driving recess of the outer ring to form a multi-step stroke structure with decreasing gas energy.

[0063] The gas power device can be designed according to the load requirements, in which the core 3 can be set to a 2-stage flow channel, a 3-stage flow channel, or more stages of intake flow channels. Each stage cycle performs work, fully utilizes energy, and maximizes the use efficiency to meet the output torque and speed requirements.

[0064] like Figure 7 It is a schematic diagram of a 4-stage flow channel. After the compressed gas enters from the 1st-stage flow channel 311, it passes through the 2nd, 3rd, and 4th-stage flow channels 312, 313, and 314, and is ejected to act on the corresponding driving recess 11. Finally, the gas is output through the exhaust flow channel 310; Figure 7 This is a schematic diagram of the 5-stage intake air duct. The working process is the same as Figure 8 The schematic is similar. Figure 8 The secondary flow channel 300 includes a return channel and a connected stroke channel, such as Figure 8 The return path 3131 and the connected stroke path 3132 in the third-stage flow channel, the return path 3131 is connected to the driving recess corresponding to the outer ring, and the stroke path 3132 is connected to another driving recess.

[0065] See also Figure 3 The gas power device also includes a shaft 2, the outer ring 1 is coaxially arranged on the shaft 2 with the core 3, and the shaft 2 is provided with inlet and outlet shaft channels 21, 210 respectively connected to the inlet channel 31 and the exhaust channel 310 of the core 3. The inlet and outlet shaft channels in the shaft form an inlet and an outlet, and the inlet and outlet shaft channels are non-connected structures. The outer ring 1 is matched with the shaft 2 through the side plates 41, 42 to form a closed space, and the core 3 is arranged in the closed space and connected and fixed to the shaft 2. In the present invention, the core 3 is provided with at least two steps of flow channels, each step of the flow channel is connected to the driving recess corresponding to the outer ring, and finally the gas is discharged from the exhaust flow channel.

[0066] See also Figure 3 In the present invention, the core body 3 can be formed by the cooperation of a left core body and a right core body, and the cooperation surfaces of the left core body and the right core body are provided with an air intake channel 31 and an exhaust channel 310. The core body 3 can also be integrally cast.

[0067] See also Figure 3 , Figure 6 This embodiment is a primary drive structure. An air channel is arranged circumferentially on the core 3 to form a primary drive structure. The air channel is also called an independent working unit. An air inlet channel 31, a nozzle 301, at least two driving recesses 11, at least one primary flow channel 300, a discharge port 302 and an exhaust channel 310 on the core 3 and the outer ring 1 form an independent working unit. The gas power device includes at least one independent working unit. The air inlet channel 31, the nozzle 301, the driving recess 11, the secondary flow channel 300, the discharge port 302 and the exhaust channel 310 in the independent working unit constitute a gas flow path.

[0068] See also Figure 3 , Figure 6 or Figure 7 In the present invention, more than two driving recesses 11 are arranged on the inner ring surface of the outer ring 1, each driving recess has a contour bottom surface 111 and a driving surface 112, the contour line of the contour bottom surface 111 can be a common arc line or a spiral line, when the contour line of the contour bottom surface is a logarithmic spiral line, its pole is set on the axis, each driving recess 11 is also connected with the adjacent step flow channel so that the gas entering the previous step flow channel is discharged from the next step flow channel.

[0069] In the present invention, the direction of the air inlet channel of the core body 3, namely the first-stage flow channel, can be a common arc line or a spiral line, and the direction of each secondary flow channel, namely the stroke channel in the N-th-stage flow channel, can also be a common arc line or a spiral line.

[0070] like Figure 6 and Figure 7 The core body 3 of the present invention is provided with an air inlet channel 31, which runs in a logarithmic spiral extending from the middle to the outside. The stroke channel of the secondary flow channel 300 runs in a logarithmic spiral, and the logarithmic spiral of the stroke channel of the secondary flow channel runs in a direction substantially the same as the logarithmic spiral of the air inlet channel. The air inlet channel of the core body 3 runs in a logarithmic spiral extending from the middle to the outside, and the pole of the logarithmic spiral is set on the central axis of the core body. The logarithmic spiral runs in an angle of 15°-45°. The smaller the angle, the longer the flow channel and the more the loss. The larger the angle, the smaller the tangential component of the driving outer ring.

[0071] See also Figure 3 , Figure 4 and Figure 5 In the present invention, the inlet and outlet shaft channels 21, 210 in the shaft 2 form an inlet and an outlet, and the inlet and outlet shaft channels are non-connected structures. The inlet and outlet of the shaft can be set at one end or both ends of the shaft, the inlet shaft channel 21 is connected to the inlet channel 31 of the core body, and the shaft outlet extends axially to form the outlet shaft channel 210, which is connected to the exhaust channel 310 of the core body.

[0072] The gas power device involved in this application refers to a device that can convert gas energy into mechanical rotation, wherein the device may include other components in addition to the necessary outer ring, core body and its corresponding recessed structure or flow channel structure design; for example, it may include a housing and a sealing structure that provide external protection, or a coupling that provides torque transmission. The outer ring may have different specific forms according to different mechanical rotation output modes, such as an outer toothed structure formed on the outer side of the outer ring to facilitate the output of kinetic energy through gear transmission; another example is that the outer ring has a belt groove to output kinetic energy through belt transmission; another example is that the outer ring has a mounting flange to facilitate the installation of a coupling to output kinetic energy; and so on. The core body and the outer ring are made of hard materials, not limited to metals, metal alloys, plastics, and composite materials. The processing methods of the recessed structure or flow channel structure of the core body and the outer ring can be realized by all known production means, including but not limited to die casting, forging, extrusion, 3D printing, and so on. The air pressure input to the power device may be generated by a compressor (such as an air pressure pump), a container of compressed fluid (such as a high-pressure gas cylinder), or the like.

[0073] Figure 3 and Figure 6It should be noted that the air inlet channel 31 and the exhaust channel 310 of the core body and the air inlet shaft channel 21 and the air outlet shaft channel 210 do not correspond to each other according to the drawing rules, but for the sake of illustration, Figure 3 The air inlet channel and the exhaust channel of the core body refer to the air inlet channel and the exhaust channel. Figure 8 and Fig.11 A similar schematic diagram is shown here.

[0074] Example 2: Please refer to Figures 8 to 11 The gas power device includes two independent working units to form a two-stage driving structure, that is, two air channels are arranged circumferentially on the core 3, each air channel includes an intake channel 31 of more than one order and a secondary flow channel 300 and an exhaust flow channel arranged circumferentially along the core 3. The gas power device comprises an outer ring 1, whose inner ring surface is provided with a plurality of driving recesses 11 on the circumference; a core body 3, which is coaxially arranged in the outer ring 1 and can rotate relative to the outer ring, and the outer ring surface of the core body is provided with two groups of nozzles and exhaust ports, and at least one primary flow channel is provided between each group of nozzles and exhaust ports; the core body is provided with two air inlet channels 31, 32, which correspond to the connected nozzles; and two exhaust channels 310, 320, which correspond to the connected exhaust ports; two streams of gas enter from the two air inlet channels of the core body respectively, and are ejected step by step through the nozzles of the core body 3 and the secondary flow channel 300, acting on the corresponding driving recesses 11 on the circumference of the outer ring, generating thrust on these driving recesses to drive the outer ring 1 to rotate and do work, realizing power output, and finally, the gas is discharged through the exhaust port of the core body through the exhaust channel. The above-mentioned one air inlet channel, one nozzle, a corresponding number of driving recesses and corresponding secondary flow channels, exhaust ports and one exhaust channel form an independent work unit.

[0075] The gas power device also includes a shaft 2, and the outer ring 1 is coaxially arranged on the shaft with the core 3. The shaft 2 is provided with air inlet shafts 21, 22 and air outlet shafts 210, 220 which are respectively connected to the air inlet channels 31, 32 and the air exhaust channels 310, 320 of the core. The shaft 2 is provided with two air inlets and two air outlets corresponding to the air channels; the compressed gas enters from the two air inlets of the shaft 2, is ejected through the air inlet channel of the core 3, and acts on the driving recess 11 of the outer ring 1, generating thrust to drive the outer ring 1 to rotate and do work, and finally the compressed gas returns to the corresponding air outlet through the exhaust channel of the core 3, realizing the continuous output of power. The other structures are the same as those in Example 1 and will not be repeated.

[0076] Embodiment 3: The gas power device of the present invention includes 4 or more independent working units to form a multi-stage driving structure. Three or more air channels are arranged circumferentially on the core body. Each air channel includes an intake channel and a secondary flow channel of more than one order and an exhaust flow channel arranged circumferentially along the core body. The intake channel and the exhaust channel are arranged on the mating surfaces of the left and right core bodies. The shaft is provided with intake channels and exhaust channels corresponding to the number of air channels. The compressed gas enters from the intake channel of the shaft, is ejected through the intake channel of the core body, and acts on the driving recess of the outer ring, pushing the outer ring to rotate and do work, thereby realizing continuous power output. Finally, the compressed gas returns to the corresponding exhaust channel through the exhaust channels of the core body. The other structures are the same as those in Embodiment 1.

[0077] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A pneumatic tool, comprising a housing, a gas power device and a tool set, wherein the tool set is a pneumatic wrench, a pneumatic lifter, a pneumatic drill, a pneumatic punch, a pneumatic hammer, a pneumatic screwdriver, a pneumatic cutter, a pneumatic grinder, a pneumatic spray gun, a pneumatic rivet gun, a pneumatic cap gun, an air shovel or a pneumatic file, and the tool set is drivingly connected to the gas power device, characterized in that: The gas powered device comprises: An outer ring, whose inner ring surface is provided with a plurality of driving recesses in the circumferential direction; A core body is coaxially arranged in the outer ring and can rotate relative to the outer ring, and the outer ring surface of the core body is provided with at least one nozzle, at least one discharge port, and at least one flushing channel located between the nozzle and the discharge port; at least one air inlet passage connected to at least one nozzle; and at least one exhaust passage communicating with at least one exhaust port; An intake passage and an exhaust passage are formed in the core; The core includes: An air inlet passage, which forms a nozzle on the peripheral surface of the core body, and whose direction is an arc line extending from the middle to the outside, and the nozzle is connected with the driving concave portion corresponding to the outer ring to form a first-stage flow channel; The secondary flow channel is an arc line extending from the edge of the core body inward and then bending to the edge. Each secondary flow channel is connected with the front and rear driving recesses corresponding to the outer ring, forming N-step flow channels along the circumference of the core body, where N is a natural number ≥ 2; Each step of the flow channel cooperates with the corresponding driving concave portion of the outer ring to form a multi-step stroke structure with decreasing gas energy; The direction of the core air inlet channel is a logarithmic spiral extending from the middle to the outside, the pole of the logarithmic spiral is set on the central axis of the core, and the logarithmic spiral direction angle is 15°-45°; The gas enters from the air inlet channel, is ejected step by step through the nozzle of the core body and the secondary flow channel, and acts on at least two driving recesses on the circumference of the outer ring, generating thrust for these driving recesses to drive the outer ring to rotate and do work. Finally, the gas is discharged through the exhaust port of the core body through the exhaust channel, realizing power output and acting on the tool group, making it perform functional operations.

2. The pneumatic tool according to claim 1, characterized in that: At least one air inlet channel, at least one nozzle, at least two driving recesses, at least one primary flow channel, at least one discharge port and at least one exhaust channel form an independent working unit, and the gas power device includes at least one independent working unit.

3. The pneumatic tool according to claim 1, characterized in that: The nozzle and the secondary flow channel on the core body are connected with the driving recess corresponding to the outer ring, and the secondary flow channel is arranged along the circumference of the core body or the outer ring.

4. The pneumatic tool according to claim 1, characterized in that: The gas power device also includes a shaft, the outer ring is coaxially arranged on the shaft with the core body, and the shaft is provided with inlet and outlet shaft passages which are respectively connected to the inlet passage and the exhaust passage of the core body.

5. The pneumatic tool according to claim 2, characterized in that: The gas power device includes more than two independent working units to form a multi-stage driving structure, and is arranged along the circumference of the core body or the outer ring.

6. The pneumatic tool according to any one of claims 1 to 5, characterized in that: More than two driving recesses are arranged on the inner ring surface of the outer ring, each driving recess has a contour bottom surface and a driving surface, the contour line of the contour bottom surface is a logarithmic spiral line, and its pole is arranged at the center of the core body.

7. The pneumatic tool according to claim 1, characterized in that: The shell is surrounded by an air inlet groove, a first chamber, and a second chamber. The gas power device is accommodated in the first chamber, and the tool group is rotatably accommodated in the second chamber. The first chamber is connected to the air inlet groove and the second chamber. A control valve group is also arranged on the air inlet groove. The control valve group is connected to a high-pressure gas source. The control valve group controls the gas to enter the air inlet groove from the high-pressure gas source.

8. The pneumatic tool according to claim 7, characterized in that: It also includes a shielding body, which is detachably connected to the top of the shell and forms an exhaust groove with the shell, the exhaust groove is communicated with the first chamber, and an exhaust port connected to the exhaust groove is formed at one end of the shielding body, so that the gas exhausted from the shell can be guided to a predetermined direction through the shielding body above the shell and discharged to the external space.

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