CN101125423A

CN101125423A - Hand-held electric tool

Info

Publication number: CN101125423A
Application number: CNA2006101156652A
Authority: CN
Inventors: 张士松
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2006-08-14
Filing date: 2006-08-14
Publication date: 2008-02-20

Abstract

The invention relates to an electric tool which can produce dust in the use process, in particular to a curve staple. The electric tool comprises a shell, a motor axis and a cleaning device which is detachable and connected with the shell. The cleaning device comprises a shell with an air inlet and an air outlet, a dust collecting room, a purifying device and a fan driven by the axis of the motor; wherein the air inlet is opposite and connected with the air entrance of the purifying device; the air outlet of the purifying device is opposite and connected with the air outlet; and the fan is positioned between the air outlet of the purifying device and the air outlet. Compared with the prior art, the invention is provided with an independent fan to enhance the cleaning efficiency; the invention can ensure that only clean air can pass through the fan to enhance the service life of the fan; and the invention can enhance the efficiency of the whole cleaning device.

Description

Hand-held electric tool

Technical Field

The present invention relates to a dust removing device for an electric tool, and more particularly, to an electric tool which generates particles (e.g., wood chips) during use.

Background

Certain types of wood produce dust that is fine and lightweight during use of a power tool, such as a jigsaw, and thus potentially harmful to human health. Accordingly, power tools are often provided with a means of preventing dust from entering the surrounding environment so that the operator is not exposed to excessive amounts of dust while working.

In order to prevent the dust from being totally or largely emitted, some dust-generating power tools are usually provided with mechanical separators, such as: DE10153939, US5848985 and chinese 97224813 disclose a purification device using a filter layer, such as a mesh, screen, paper bag or cloth. Experience has shown that such mechanical separators are often blocked or even completely blocked in a relatively short time, so that the efficiency of the separator is reduced and the dust is no longer prevented from entering the surroundings.

The power tool described in DE10153939 has a dust collecting device at the rear, which comprises a dust collecting chamber, a fan and a filter device. The dust enters from the inlet of the dust collecting chamber, enters the dust collecting chamber through the fan, then passes through the filter device, fine dust is left in the dust collecting chamber, and clean air is discharged out of the dust collecting chamber. The disadvantages are that: the dust must pass through the fan to enter the dust collecting chamber, so that the service life of the fan is shortened, and heat is possibly generated to burn the filter device, so that the service life of the dust collecting device is shortened.

With respect to dust generated by wood and other materials such as concrete, certain standards have been developed that specify the maximum time workers can stay in air with a certain level of dust. To meet these standards, the separators described above require constant cleaning or replacement, and are therefore time consuming and costly.

Cyclones are well known devices that effectively separate dust from gas, however, they are relatively large and are commonly used in chemical plants. US4373228 and US4593429 each disclose a cyclonic separator for use in a vacuum cleaner for separating dirt from air.

Disclosure of Invention

In order to overcome the defect of the dust removal efficiency of the conventional electric tool, the invention aims to provide the electric tool, which ensures that only clean air passes through the fan in the dust removal process, so that the service life of the fan is prolonged, and the service efficiency of the whole dust removal device is improved.

Another object of the present invention is to provide a power tool with a cyclone separator, which is easy to manufacture, simple to install, and has higher dust removal efficiency.

The technical scheme adopted by the invention for solving the problems in the prior art is as follows:

a hand-held electric tool comprises a housing; a motor shaft driven by a motor installed in the housing; the dust removing device comprises a shell with an air inlet and an air outlet, a dust collecting chamber, a purifying device and a fan driven by a motor shaft, wherein the air inlet is opposite to and communicated with the air inlet of the purifying device, the air outlet of the purifying device is opposite to and communicated with the air outlet, and the fan is positioned between the air outlet of the purifying device and the air outlet.

Further, the above-mentioned purifying device of the hand-held electric tool is a cyclone separator, the air inlet of the purifying device is a separator inlet, the air outlet of the purifying device is a vent hole, and the cyclone separator comprises: a tapered tubular body having a first end with a larger diameter and a second end with a smaller diameter, a separator inlet being located laterally of the first end; a separator outlet at the second end communicating with the dust chamber; a vent is disposed at the first end.

Furthermore, the dust collecting chamber of the handheld electric tool is provided with an adjacent wall, a far wall and at least one side wall, and the cyclone separator is fixed on the adjacent wall and is arranged in the dust collecting chamber.

Still further, in the above-mentioned hand-held electric tool, at least one ventilation hole is provided on the adjacent wall, fixed inside the main body along the central axis of the cone-shaped tubular main body, and located at the first end of the cyclone separator.

Furthermore, the handheld electric tool comprises two parallel cyclone separators and two parallel air vents.

Furthermore, in the above-mentioned hand-held electric tool, an outlet is provided on the housing, and is communicated with the air inlet and the separator inlet.

Furthermore, the fan of the hand-held electric tool is fixedly arranged on the fan shaft, and the fan shaft is connected with the motor shaft in a flat manner.

Furthermore, a baffle plate is arranged between the cyclone separator and the fan of the hand-held electric tool, the cyclone separator is fixed on one side surface of the baffle plate and is arranged on one side of the dust collecting chamber, at least one vent hole penetrates through the baffle plate, and the cyclone separator is fixed inside the main body along the central axis of the conical tubular main body and is communicated with an air outlet on the shell of the dust removing device.

Furthermore, the hand-held power tool is a saw power tool, in particular a jigsaw.

Compared with the prior art, the invention has the beneficial effects that: an independent fan is provided, so that the dust removal efficiency is improved, and only clean air can pass through the fan, so that the service life of the fan is prolonged, and the service efficiency of the whole dust removal device is improved; and the dust removal device in the prior art is changed from the prior art that a filtering layer such as a net, a sieve, a paper bag or cloth is used, and a cyclone separator is used for removing dust, so that the dust removal efficiency is higher, and the cyclone separator is easy to manufacture and simple to install.

Drawings

The technical scheme of the invention is explained in detail with the accompanying drawings;

FIG. 1 is a partial cross-sectional view of a hand held power tool of the present invention;

FIG. 2 is an exploded view of the dust extraction mechanism of the hand held power tool of the present invention;

FIG. 3 is a cross-sectional view of a dust extraction apparatus of the present invention;

FIG. 4 is a view of the dust extraction device of FIG. 3 taken along the direction I-I;

FIG. 5 is a cross-sectional view of the housing of the dust extraction device of FIG. 3;

FIG. 6 is another perspective view of the baffle of FIG. 2;

FIG. 7 is another perspective view of the fan of FIG. 2;

wherein,

2 electric tool 4 casing 6 dust collector

7 casing 8 bearing 9 bearing retainer ring

10 fan shaft 12 washer 14 fan

16 baffle 16a first plane 16b second plane

18a first cyclone separator 18b second cyclone separator 20 rear cover

22 inlet 24 outlet 26a first tubular body

26b second tubular body 28 first end 30 second end

32 separator inlet 34a first separator outlet 34b second separator outlet

36a first vent hole 36b and a second vent hole 42

44 motor shaft 50 fan chamber 52 dirt collection chamber

60 fan spline 61 fan center hole 62 fan shaft spline

64 first step 66 second step 68 fan step

70 adjacent face 72 central bore 74 threaded bore

76 first ring groove 77 second ring groove 78 third ring groove

80 screw hole 82 screw a dust-laden air

b dust c clean air

Detailed Description

As shown in FIG. 1, a hand-held power tool 2 includes a housing 4, a motor shaft 44 mounted inside the housing, an outlet 42 provided in the housing through which dust-laden air a is discharged, and a dust removing device 6 detachably coupled to the housing 4.

As shown in fig. 2 to 4, the dust removing device 6 includes a housing 7, a bearing 8, a bearing retainer 9, a fan shaft 10, a gasket 12, a fan 14, a baffle 16, a rear cover 20, and two cyclones 18a and 18 b. The housing 7 has an air inlet 22 and two symmetrical air outlets 24 (the other side is not shown in fig. 2). The baffle 16 divides the inner space formed by the housing 7 and the rear cover 20 into two parts, one plane 16a of the baffle 16 and a part of the inner surface of the housing 7 form a fan chamber 50, and the other plane 16b of the baffle 16 and a part of the inner surface of the housing 7 and the rear cover 20 form a dust collecting chamber 52. The fan 14 is sleeved on the fan shaft 10 and is arranged in the fan chamber 50; the cyclones 18a, 18b are secured to the other planar surface 16b of the baffle 16 and are located in the dirt-collection chamber 52.

Therein, as shown in FIGS. 2 and 3, the cyclones 18a, 18b each have a tapered tubular body 26a, 26b arranged in parallel with a first end 28 and a second end 30. A common separator inlet 32 is located laterally of the first end 28 and communicates with the inlet opening 22 in the housing 7, the inlet opening 22 communicating with an outlet opening 42 in the housing (shown in figure 1), and two separator outlet openings 34a and 34b are located adjacent the second end 30 for discharging dust b from the separators into a dust collection chamber 52.

As shown in fig. 6, the baffle 16 has two air vents 36a and 36b disposed on the central axis of the interior of the cone-shaped tubular bodies 26a and 26b for discharging clean air c out of the cone-shaped tubular bodies, and the air vents communicate with the air outlet 24 of the housing 7 of the dust removing device 6.

Further, during assembly of the dust removing device 6, as shown in fig. 2, the fan shaft 10 has a spline 62 and two

steps

64, 66, the spline 62 being located on the first step 64. As shown in fig. 7, the fan 14 has splines 60 in a central bore 61 that interact with splines 62 of the fan shaft 10 to circumferentially fix the fan 14 and the fan shaft 10; the central bore 61 of the fan 14 as shown in figures 3 and 4 has a step 68 therein which abuts the first step 64 of the fan shaft 10 to axially secure the fan 14 and fan shaft 10. As shown in FIG. 2, the adjacent face 70 of the housing 7 has a central aperture 72 and three equally spaced threaded apertures 74; as shown in fig. 3 and 5, the housing 7 has three annular grooves 76, 77, 78 widened in sequence, in which the retainer ring 9, the bearing 8, and the washer 12 are respectively disposed. As shown in fig. 2, the washer 12 has three equally spaced threaded holes 80 which are engaged by three screws 82 (shown in fig. 1) with the threaded holes of the washer 12 and the housing 7 to lockingly secure the retainer ring 9, the bearing 8, and the washer 12 relative to each other in the three annular grooves 76, 77, 78 in the housing 7.

Still further, the fan shaft 10 passes through the center hole 72 of the housing 7, and the second step 66 of the fan shaft 10 abuts against the inner race of the bearing 8, so that the fan shaft 10 and the housing 7 are axially fixed relative to each other. As shown in fig. 1 and 2, the motor shaft 44 is connected to the fan shaft 10 in an oblate configuration. The cyclones 18a and 18b are screwed to the baffle 16, and the baffle 16 is also screwed to the inside of the casing 7.

Still further, as shown in fig. 1, the outlet 42 of the hand-held power tool 2 is integrally connected to the housing 4; but the outlet may also be an accessory that is connected to the housing but can be removed, or an extension of the inlet 22 of the dust extraction device 6.

In the operation of the invention disclosed in fig. 1, when the hand-held power tool 2 is put into operation, the motor shaft 44 inside the housing 4 starts to rotate and the fan shaft 10 is brought into rotation, so that the fan 14 also rotates. This allows the dirt-laden air a to enter the interior of the cone-shaped tubular bodies 26a and 26b of the cyclones 18a and 18b via the outlet 42 in the housing and the separator inlet 32. Under the influence of the fan 14, the dust-laden air a generates a vortex and starts to rotate inside the conical tubular bodies 26a and 26 b. The dust b falls from the separator outlets 34a and 34b into the dust collecting chamber 52 due to centrifugal force, etc.; the clean air c passes through the ventilation holes 36a and 36b, passes through the fan 14 and the air outlet 24, and is discharged to the outside of the dust removing device 6. Furthermore, dust in the dust collecting chamber 52 can be cleaned regularly by the rear cover 20 which can be opened.

In addition to the preferred embodiments described above, there are numerous specific embodiments of the present invention. All technical solutions formed by using equivalent substitutions or equivalent transformations fall within the scope of the claimed invention.

Claims

1. A hand-held power tool (2) comprises a housing (4); a motor shaft (44) driven by a motor mounted in the housing; a removable dust extraction unit (6) connected to the housing, said dust extraction unit (6) including a housing (7) having an inlet (22) and an outlet (24), a dust collection chamber (52), a cleaning device (18) and a fan (14) driven by a motor shaft (44), characterized in that: the air inlet (22) is opposite to and communicated with the air inlet of the purifying device (18), the air outlet of the purifying device (18) is opposite to and communicated with the air outlet (24), and the fan (14) is positioned between the air outlet of the purifying device (18) and the air outlet (24).

2. The hand-held power tool of claim 1, wherein: the purification device (18) is a cyclone separator (18), the air inlet of the purification device (18) is a separator inlet (32), the air outlet of the purification device (18) is a vent hole (36), and the cyclone separator (18) comprises: a tapered tubular body (26) having a first end (28) of greater diameter and a second end (30) of lesser diameter, a separator inlet (32) flanking the first end; a separator outlet (34) at the second end communicating with the dirt collection chamber (52); a vent (36) is disposed at the first end.

3. The hand-held power tool according to claim 1 or 2, characterized in that: the dust collecting chamber (52) is provided with an adjacent wall (16b), a far wall (20) and at least one side wall, and the cyclone-type separator (18) is fixed on the adjacent wall and is arranged in the dust collecting chamber.

4. The hand-held power tool according to claim 1 or 2, characterized in that: at least one ventilation aperture (36) is provided in the adjacent wall (16b) and is fixed within the tapered tubular body (26) along the central axis of the body at the first end (28) of the cyclone separator.

5. The hand-held power tool of claim 1, wherein: the power tool includes two juxtaposed cyclones (18a, 18b), and two juxtaposed vents (36a, 36 b).

6. The hand-held power tool according to claim 1 or 2, characterized in that: an outlet (42) is provided in the housing and is in communication with the inlet (22) and the separator inlet (32).

7. The hand-held power tool of claim 1, wherein: the fan (14) is fixedly arranged on the fan shaft (10), and the fan shaft (10) is flatly and fixedly connected with the motor shaft (44).

8. The hand-held power tool of claim 2, wherein: a baffle plate (16) is arranged between the cyclone separator (18) and the fan (14), and the cyclone separator is fixed on one side surface (16b) of the baffle plate and is arranged on one side of the dust collection chamber (52).

9. The hand-held power tool of claim 9, wherein: at least one vent hole (36) penetrates through the baffle plate (16), is fixed inside the conical tubular main body (26) along the central axis of the main body and is communicated with an air outlet (24) on the shell (7) of the dust removing device.

10. The hand-held power tool of claim 1, wherein: the hand-held electric tool is a saw electric tool, in particular a jig saw.