Angle grinder with dust removal function

Abstract

The present invention discloses an angle grinder with a dust removal function, which relates to the technical field of electric tools. The angle grinder includes an angle grinder, a micro fan and a jet pump. The angle grinder and the micro fan are detachably connected. The angle grinder includes a rotating shaft, a grinding disc, a grinding disc cover and a dust suction pipe. The suction end of the jet pump is connected to the grinding disc cover through the dust suction pipe. The rotating shaft is connected to the fan shaft of the micro fan. When the angle grinder is working, the airflow output by the micro fan flows through the jet pump and generates suction. The angle grinder provided by the present invention has two different working modes. When the micro fan and the jet pump are removed, it can be used as an ordinary angle grinder. After the micro fan and the jet pump are installed, when it is working, the micro fan provides a working airflow to the jet pump. The jet pump sucks away the dust near the grinding disc through the Bernoulli effect, so that it has a dust removal function.

Description

Technical Field

[0001] The invention relates to the field of angle grinders, and in particular to an angle grinder with a dust removal function. Background Art

[0002] Angle grinder is a multifunctional equipment suitable for factory processing, interior decoration, and outdoor projects. It can be installed with grinding discs, saw blades, and slices to achieve different cutting purposes. The defect of angle grinder is that it will generate a lot of dust when used to cut wood or plastic. When using it for interior decoration, especially when the interior has been decorated to a certain extent, when using angle grinder to repair some decoration structures, the dust generated is almost unacceptable to the owner.

[0003] Therefore, an angle grinder capable of removing dust during use is needed. Meanwhile, in order to improve its versatility and expand its market scope, the dust removal function of the angle grinder should be detachable. Summary of the invention

[0004] The object of the present invention is to provide an angle grinder with a dust removal function to solve the technical problem that the existing angle grinders do not have the dust removal function.

[0005] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0006] An angle grinder with dust removal function, comprising a grinding mechanism, a micro-blower and a jet pump, wherein the grinding mechanism and the micro-blower are detachably connected, the jet pump comprises an input end, an output end and a suction end, and the air outlet of the micro-blower is detachably connected to the input end; wherein the grinding mechanism comprises a rotating shaft, both ends of the rotating shaft are exposed to the outside of the housing of the grinding mechanism, a transmission part is formed at one end of the rotating shaft, and the transmission part is detachably connected to the prime mover of the micro-blower, so that the transmission part can deliver air to the micro-blower. The micro fan transmits the torque that makes the micro fan work; the grinding disc cover shell is a hollow shell, the grinding disc cover shell is in the shape of a superior arc and has an opening at its chord; a dust suction pipe, one end of the dust suction pipe is connected to the interior of the grinding disc cover shell, and the other end of the dust suction pipe is detachably connected to the suction end; when the airflow output by the micro fan flows from the input end to the output end, the suction end generates negative pressure suction, so that the dust inside the grinding disc cover shell flows through the dust suction pipe, the suction end and the output end.

[0007] Preferably, the micro fan includes a fan housing, a fan shaft and fan blades, the fan housing is detachably connected to the grinding mechanism, the fan shaft can be rotatably installed inside the fan housing, one end of the fan shaft is exposed to the outside of the fan housing and is detachably connected to the transmission part, the fan blades are located inside the fan housing and are coaxially connected to the fan shaft, an air inlet and an air outlet are formed on the fan housing, and the air outlet is detachably connected to the input end.

[0008] Preferably, the fan blades are centrifugal fan blades.

[0009] Preferably, a nut is installed on the outside of the shell of the grinding mechanism, and the nut is coaxial with the rotating shaft. A threaded barrel is formed on the fan shell and is coaxially sleeved on the outside of the fan shaft. The threaded barrel can be spirally connected with the nut, and the inner diameter of the threaded barrel is greater than the outer diameter of the fan shaft. When the threaded barrel is spirally connected with the nut, the transmission part is transmission connected with the fan shaft.

[0010] Preferably, the transmission part is in the shape of a blind hole with edges, a clamping part is formed at one end of the fan shaft extending outside the fan housing, the clamping part is in the shape of a column with edges, and the transmission part is in clearance fit with the clamping part.

[0011] Preferably, the grinding mechanism further comprises a plug, and the plug can be threadably connected to the nut.

[0012] Preferably, the grinding plate cover comprises an upper cover plate and a lower cover plate, both of which are arc-shaped sheets, the edge of the upper cover plate extends axially and forms a baffle that covers the periphery of the grinding plate, the upper cover plate is detachably connected to the grinding mechanism, and the baffle is detachably connected to the lower cover plate.

[0013] Preferably, a vacuum mixing chamber and an expansion chamber are formed inside the jet pump, the vacuum mixing chamber is connected to the suction end, the expansion chamber is connected to the vacuum mixing chamber and the output end, a nozzle is formed inside the vacuum mixing chamber, the inlet of the nozzle is connected to the input end, the outlet of the nozzle is toward the output end and close to the expansion chamber, and the expansion chamber is in the shape of a critical flow Venturi nozzle.

[0014] Preferably, a boosting chamber is formed inside the jet pump, and the boosting chamber is in the shape of a conical chamber. The boosting chamber connects the input end and the nozzle, and the inner diameter of the boosting chamber gradually decreases from the input end toward the nozzle.

[0015] Preferably, the outer wall of the output end is formed with at least one annular flange.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The angle grinder provided by the present invention has two different working modes. When the micro-blower and the jet pump are removed, it can be used as an ordinary angle grinder. After the micro-blower and the jet pump are installed, when it is working, the micro-blower provides a working airflow to the jet pump, and the jet pump sucks away the dust near the grinding disc through the Bernoulli effect, so that it has a dust removal function. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0019] Figure 1 A perspective view of a normal mode of a cordless angle grinder;

[0020] Figure 2 A three-dimensional diagram of a dust removal mode of a cordless angle grinder;

[0021] Figure 3 A side view of a portion of the structure of a common mode of a rechargeable angle grinder;

[0022] Figure 4 for Figure 3 Cross-sectional view in the AA direction;

[0023] Figure 5 A side view of a portion of the structure of a dust removal mode of a rechargeable angle grinder;

[0024] Figure 6 for Figure 5 Cross-sectional view in the AA direction;

[0025] Figure 7 A three-dimensional exploded view of the dust removal mode of the cordless angle grinder;

[0026] Figure 8 It is a three-dimensional diagram of a jet pump;

[0027] Fig. 9 for Figure 8 The cross-sectional view in CC direction;

[0028] The numbers in the figure represent the following:

[0029] 1-angle grinder; 1a-rotating shaft; 1a1-transmission part; 1b-grinding disc; 1c-grinding disc cover; 1c1-upper cover; 1c2-baffle; 1c4-flange; 1c3-lower cover; 1c5-slot; 1d-dust suction pipe; 1e-nut; 1f-plug;

[0030] 2-micro fan; 2a-fan housing; 2a1-air inlet; 2a2-air outlet; 2a3-threaded cylinder; 2b-fan shaft; 2b1-clamping part; 2c-fan blade; 2d-bearing;

[0031] 3-jet pump; 3a-input end; 3b-suction end; 3c-output end; 3c1-annular flange; 3d-nozzle; 3e-vacuum mixing chamber; 3f-expansion chamber; 3g-pressurization chamber. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figure 1-9 As shown, in order to enable the angle grinder to remove dust, the present invention provides:

[0034] An angle grinder with a dust removal function comprises a grinding mechanism 1, a micro fan 2 and a jet pump 3, wherein the grinding mechanism 1 and the micro fan 2 are detachably connected, the jet pump 3 comprises an input end 3a, an output end 3c and a suction end 3b, and the air outlet of the micro fan 2 is detachably connected to the input end 3a; wherein the grinding mechanism 1 comprises a rotating shaft 1a, both ends of the rotating shaft 1a are exposed outside the housing of the grinding mechanism 1, a transmission part 1a1 is formed at one end of the rotating shaft 1a, and the transmission part 1a1 is detachably connected to the prime mover of the micro fan 2, so that the transmission part 1a1 can transmit the torque that makes the micro fan 2 work to the micro fan 2; a grinding disc 1b, a grinding disc 1b Coaxially connected to the other end of the rotating shaft 1a; a grinding disc cover shell 1c, which is a hollow shell, is in the shape of a superior arc and has an opening at its chord, covers the outer side of the grinding disc 1b and exposes the part of the grinding disc 1b away from the grinding mechanism 1; a dust suction pipe 1d, one end of the dust suction pipe 1d is connected to the interior of the grinding disc cover shell 1c, and the other end of the dust suction pipe 1d is detachably connected to the suction end 3b; when the airflow output by the micro fan 2 flows from the input end 3a to the output end 3c, the suction end 3b generates negative pressure suction, so that the dust inside the grinding disc cover shell 1c flows through the dust suction pipe 1d, the suction end 3b and the output end 3c.

[0035] During the use of the grinding mechanism 1, the rotating shaft 1a rotates at high speed and drives the grinding disc 1b to rotate so that it has cutting performance. At the same time, the transmission part 1a1 drives the fan shaft 2b to rotate so that the micro fan 2 can generate airflow through its outlet wind. When the airflow circulates inside the jet pump 3, negative pressure suction is generated inside the grinding disc cover 1c through the suction end 3b and the dust suction pipe 1d, thereby sucking in the dust generated by the grinding disc 1b and outputting it through the output end 3c. A cloth bag is installed on the output end 3c to collect the dust.

[0036] When the dust removal function is not needed, the dust suction pipe 1d, the micro fan 2 and the jet pump 3 can be removed to obtain an ordinary angle grinder.

[0037] Furthermore, this embodiment provides a structure of a micro fan 2, as described below:

[0038] The micro fan 2 includes a fan housing 2a, a fan shaft 2b and blades 2c. The fan housing 2a is detachably connected to the grinding mechanism 1, and the fan shaft 2b can be rotatably installed inside the fan housing 2a. One end of the fan shaft 2b is exposed to the outside of the fan housing 2a and is detachably connected to the transmission part 1a1. The blades 2c are located inside the fan housing 2a and are coaxially connected to the fan shaft 2b. An air inlet 2a1 and an air outlet 2a2 are formed on the fan housing 2a, and the air outlet 2a2 is detachably connected to the input end 3a.

[0039] It should also be noted that:

[0040] The micro fan 2 also includes a bearing 2d, through which the fan shaft 2b is rotatably connected to the fan housing 2a, and the fan blades 2c and the bearing 2d are connected to the fan shaft 2b via a step formed on the fan shaft 2b and a retaining spring installed on the fan shaft 2b.

[0041] Furthermore, in order to reduce the volume of the micro fan 2:

[0042] The blades 2c are centrifugal blades.

[0043] Correspondingly, the fan housing 2a is in the shape of a hollow cylinder, the air inlet 2a1 is arranged on one end face of the fan housing 2a, the air inlet 2a1 is composed of a plurality of long strip through holes evenly distributed around the axis of the fan housing 2a, the air outlet 2a2 is arranged on the outer peripheral surface of the fan housing 2a and is parallel to a radial surface of the fan housing 2a, the air outlet 2a2 is a rectangular tube formed on one side of the outer peripheral surface of the fan housing 2a, the fan blades 2c axially inhale air through the air inlet 2a1 and radially output airflow through the air outlet 2a2.

[0044] If axial flow blades are used as the blades 2c, the axial length of the fan housing 2a will be too long, causing the volume of the micro fan 2 to be too large.

[0045] Further, in order to achieve the purpose of detachably connecting the fan housing 2a and the grinding mechanism 1:

[0046] A nut 1e is installed on the outside of the shell of the grinding mechanism 1. The nut 1e is coaxial with the rotating shaft 1a. A threaded barrel 2a3 is formed on the fan shell 2a and is coaxially sleeved on the outside of the fan shaft 2b. The threaded barrel 2a3 can be screwed together with the nut 1e. The inner diameter of the threaded barrel 2a3 is greater than the outer diameter of the fan shaft 2b. When the threaded barrel 2a3 is screwed together with the nut 1e, the transmission part 1a1 is connected to the fan shaft 2b.

[0047] Furthermore, this embodiment provides an implementation method in which the transmission part 1a1 is transmission-connected to the fan shaft 2b:

[0048] The transmission part 1a1 is in the shape of a blind hole with edges. The end of the fan shaft 2b extending outside the fan housing 2a is formed with a clamping part 2b1. The clamping part 2b1 is in the shape of a column with edges. The transmission part 1a1 and the clamping part 2b1 are clearance-fitted.

[0049] Specifically, the transmission part 1a1 is an internal hexagonal hole, and the engaging part 2b1 is an external hexagonal column. When connecting the micro-blower 2 and the grinding mechanism 1, the engaging part 2b1 is first aligned with the transmission part 1a1 and inserted therein, and then the threaded barrel 2a3 is aligned with the nut 1e and rotated to tighten. During the tightening process, the engaging part 2b1 gradually penetrates into the interior of the transmission part 1a1. When the threaded barrel 2a3 and the nut 1e are tightened, the engaging part 2b1 and the transmission part 1a1 are tightly engaged to achieve the function of transmitting torque.

[0050] Furthermore, in order to prevent the rotating shaft 1a and the transmission part 1a1 from harming the user when the dust removal function is not used:

[0051] The grinding mechanism 1 further comprises a plug 1f, which can be threadedly connected with the nut 1e.

[0052] Although the transmission part 1a1 is exposed on the outside of the grinding mechanism 1, the transmission part 1a1 is sunken in a blind hole formed on the shell of the grinding mechanism 1, so that when the plug 1f is screwed with the nut 1e, the plug 1f blocks the blind hole exposing the transmission part 1a1, so that the transmission part 1a1 will not come into contact with the operator during use.

[0053] Further:

[0054] The grinding plate cover 1c includes an upper cover plate 1c1 and a lower cover plate 1c3. The upper cover plate 1c1 and the lower cover plate 1c3 are both arc-shaped plates. The edge of the upper cover plate 1c1 extends axially and forms a baffle 1c2 that covers the periphery of the grinding plate 1b. The upper cover plate 1c1 is detachably connected to the grinding mechanism 1, and the baffle 1c2 and the lower cover plate 1c3 are detachably connected.

[0055] In this embodiment, a flange 1c4 is radially extended from the edge of the baffle 1c2, and a groove 1c5 is formed on the lower cover plate 1c3 and is frictionally connected to the flange 1c4. When the groove 1c5 is engaged with the flange 1c4, the upper cover plate 1c1, the baffle 1c2 and the lower cover plate 1c3 form a superior arc bow shell with an opening at the chord.

[0056] The baffle 1c2 can also be connected to the lower cover 1c3 in other ways, such as bolt connection, snap connection, etc.

[0057] Further:

[0058] A vacuum mixing chamber 3e and an expansion chamber 3f are formed inside the jet pump 3. The vacuum mixing chamber 3e is connected to the suction end 3b, and the expansion chamber 3f is connected to the vacuum mixing chamber 3e and the output end 3c. A nozzle 3d is formed inside the vacuum mixing chamber 3e. The inlet of the nozzle 3d is connected to the input end 3a, and the outlet of the nozzle 3d is toward the output end 3c and close to the expansion chamber 3f. The expansion chamber 3f is in the shape of a critical flow Venturi nozzle.

[0059] An airflow with a certain pressure is input from the input end 3a and then ejected through the nozzle 3d at a position inside the vacuum mixing chamber 3e near the expansion chamber 3f. Then the airflow is ejected at a high speed through the expansion chamber 3f. The static pressure energy is partially converted into kinetic energy, and a vacuum is formed in the vacuum mixing chamber 3e, so that the suction end 3b generates suction. The suction end 3b sucks in dust through the dust suction pipe 1d, so that it is ejected through the expansion chamber 3f along with the high-speed airflow.

[0060] Furthermore, in order to make the airflow transmitted by the micro fan 2 through the input end 3a have a certain pressure:

[0061] A boosting chamber 3g is formed inside the jet pump 3. The boosting chamber 3g is a conical chamber. The boosting chamber 3g connects the input end 3a and the nozzle 3d. The inner diameter of the boosting chamber 3g gradually decreases from the input end 3a toward the nozzle 3d.

[0062] When the airflow passes through the boost chamber 3g with a gradually decreasing inner diameter, the pressure gradually increases, and finally forms an airflow with a certain pressure and then sprays out through the nozzle 3d.

[0063] Further:

[0064] At least one annular flange 3c1 is formed on the outer wall of the output end 3c.

[0065] The annular flange 3c1 can be used to provide friction when connecting the output end 3c and the bellows, or to provide a positioning structure for tying with a cable tie when connecting the output end 3c and the cloth bag. The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions should also be deemed to fall within the protection scope of the present invention.

Claims

1. An angle grinder with dust removal function, characterized in that: The invention comprises a grinding mechanism (1), a micro fan (2) and a jet pump (3), wherein the grinding mechanism (1) and the micro fan (2) are detachably connected, the jet pump (3) comprises an input end (3a), an output end (3c) and a suction end (3b), and the air outlet of the micro fan (2) is detachably connected to the input end (3a). The grinding mechanism (1) comprises: A rotating shaft (1a), both ends of the rotating shaft (1a) are exposed outside the housing of the grinding mechanism (1), a transmission part (1a1) is formed at one end of the rotating shaft (1a), a grinding disc (1b) is coaxially connected to the other end of the rotating shaft (1a), and the transmission part (1a1) is detachably connected to a driving part of the micro-blower (2), so that the transmission part (1a1) can transmit a torque to the micro-blower (2) to make the micro-blower (2) work; A grinding disc cover shell (1c), the grinding disc cover shell (1c) being a hollow shell, the grinding disc cover shell (1c) being in the shape of a major arc and having an opening at its chord, the grinding disc cover shell (1c) covering the outside of the grinding disc (1b) and exposing a portion of the grinding disc (1b) away from the grinding mechanism (1); A dust suction pipe (1d), one end of the dust suction pipe (1d) being connected to the interior of the grinding plate cover (1c), and the other end of the dust suction pipe (1d) being detachably connected to the suction end (3b); When the airflow output by the micro fan (2) flows from the input end (3a) to the output end (3c), the suction end (3b) generates negative pressure suction, so that the dust inside the grinding disc cover (1c) flows through the dust suction pipe (1d), the suction end (3b) and the output end (3c).

2. The angle grinder with dust removal function according to claim 1, characterized in that: The micro fan (2) comprises a fan housing (2a), a fan shaft (2b) and a fan blade (2c); the fan housing (2a) is detachably connected to the grinding mechanism (1); the fan shaft (2b) is rotatably mounted inside the fan housing (2a); one end of the fan shaft (2b) is exposed outside the fan housing (2a) and is detachably connected to the transmission part (1a1); the fan blade (2c) is located inside the fan housing (2a) and is coaxially connected to the fan shaft (2b); an air inlet (2a1) and an air outlet (2a2) are formed on the fan housing (2a); the air outlet (2a2) is detachably connected to the input end (3a).

3. The angle grinder with dust removal function according to claim 2, characterized in that: The fan blades (2c) are centrifugal fan blades.

4. The angle grinder with dust removal function according to claim 2, characterized in that: A nut (1e) is installed on the outer side of the housing of the grinding mechanism (1), and the nut (1e) is coaxial with the rotating shaft (1a). The fan housing (2a) is formed with a threaded barrel (2a3) coaxially sleeved on the outer side of the fan shaft (2b). The threaded barrel (2a3) can be screwed together with the nut (1e), and the inner diameter of the threaded barrel (2a3) is greater than the outer diameter of the fan shaft (2b). When the threaded barrel (2a3) is screwed together with the nut (1e), the transmission part (1a1) is in transmission connection with the fan shaft (2b).

5. The angle grinder with dust removal function according to claim 4, characterized in that: The transmission part (1a1) is in the shape of a blind hole with edges, and a clamping part (2b1) is formed on one end of the fan shaft (2b) extending outside the fan housing (2a), and the clamping part (2b1) is in the shape of a column with edges, and the transmission part (1a1) and the clamping part (2b1) are clearance-matched.

6. The angle grinder with dust removal function according to claim 4, characterized in that: The grinding mechanism (1) further comprises a plug (1f), wherein the plug (1f) can be threadedly connected to the nut (1e).

7. The angle grinder with dust removal function according to claim 1, characterized in that: The grinding plate cover (1c) comprises an upper cover plate (1c1) and a lower cover plate (1c3); the upper cover plate (1c1) and the lower cover plate (1c3) are both plates in the shape of a major arc; the edge of the upper cover plate (1c1) extends axially and forms a baffle plate (1c2) that shields the periphery of the grinding plate (1b); the upper cover plate (1c1) is detachably connected to the grinding mechanism (1); and the baffle plate (1c2) and the lower cover plate (1c3) are detachably connected.

8. The angle grinder with dust removal function according to claim 1, characterized in that: The jet pump (3) has a vacuum mixing chamber (3e) and an expansion chamber (3f) formed inside, wherein the vacuum mixing chamber (3e) is connected to the suction end (3b), and the expansion chamber (3f) is connected to the vacuum mixing chamber (3e) and the output end (3c). A nozzle (3d) is formed inside the vacuum mixing chamber (3e), wherein the inlet of the nozzle (3d) is connected to the input end (3a), and the outlet of the nozzle (3d) faces the output end (3c) and is close to the expansion chamber (3f), and the expansion chamber (3f) is in the shape of a critical flow Venturi nozzle.

9. The angle grinder with dust removal function according to claim 8, characterized in that: A boost chamber (3g) is formed inside the jet pump (3), and the boost chamber (3g) is in the shape of a conical chamber. The boost chamber (3g) connects the input end (3a) and the nozzle (3d), and the inner diameter of the boost chamber (3g) gradually decreases from the input end (3a) toward the nozzle (3d).

10. The angle grinder with dust removal function according to claim 1, characterized in that: The outer wall of the output end (3c) is formed with at least one annular flange (3c1).

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