CN210256016U - Handheld power tool - Google Patents

Abstract

The utility model relates to a hand-held power tool with an auxiliary airflow heat dissipation system, which comprises a shell, wherein the shell forms a cavity, the cavity is provided with an extending direction and a cavity wall, and the shell forms a first air outlet and is communicated with the cavity; the two first structural members are provided with first air flow channels, the extending direction of the first air flow channels is parallel to the extending direction of the cavity, the second structural member is provided with second air flow channels, and the extending direction of the second air flow channels is perpendicular to the extending direction of the cavity; one machine body part is provided with a transmission piece capable of being driven by a motor and is arranged in the cavity; the two first structural components are respectively arranged at two sides of the machine body component, positioned between the machine body component and the shell and respectively fixed with the corresponding local part of the cavity wall through the outer side walls of the two sides of the machine body component of the first structural components; the second structural member is positioned between the tail end of the machine body component and the shell, and a gap is formed between the machine body component and the cavity wall by locally fixing the tail end of the machine body component and the corresponding cavity wall of the second structural member.

Description

Handheld power tool

Technical Field

The utility model relates to a power tool system, concretely relates to power tool with supplementary air current cooling system.

Background

In the known hand-held power tool, the body component and the housing are connected by screw threads, and the housing is mostly in a cylindrical shape and a structure of half-open left and right. The stator of the motor is fixed against the inner wall of the shell through a soft positioning structure, and a closed space is formed at the joint of the motor and the shell. Moreover, for the handheld power tool, a front end cover and a rear end cover are usually arranged on a stator of the motor to ensure that a rotating shaft of the rotor is kept at a horizontal position, so that the stability of the handheld power tool in the using process can be ensured.

When the power tool is held by hand for operation, in order to prevent the motor from overheating and affecting the service life of the motor and the tool, a fan is usually arranged on a motor rotor so as to supply the motor for operation, and the fan rotates to form cooling airflow to dissipate heat of the motor.

However, since the motor is wrapped by the front and rear end covers, the cooling airflow generated by the fan is confined in the gap between the rotor and the stator in the end covers and cannot be diffused to the outside. In the process of operation of the handheld power tool, heat generated by vibration exists in each space inside the motor, and particularly a large amount of heat is retained between the shell and front and rear end covers of the motor.

Generally, because the working head of handheld power tool extends outside the shell, there is the clearance between working head and shell, cold air can directly get into, has certain alleviating to the inside heat of shell, but, this cooling mode is only natural air cooling, especially to the large amount of heats that are detained in the enclosure space of motor and shell, can't cool down fast effectively, and after long-time operation, the motor ambient temperature is too high, influences handheld power tool's normal use.

SUMMERY OF THE UTILITY MODEL

Based on the above problem, the utility model provides a power tool with supplementary air current cooling system when increasing heat dissipation channel inside the shell, does not change power tool's original exterior structure, reaches the inside especially motor of shell and carries out effective quick radiating purpose.

The technical scheme of the utility model is that:

a hand-held power tool comprises a housing, wherein the housing forms a cavity, the cavity is provided with an extending direction and a cavity wall, the housing forms a first air outlet, and the first air outlet is communicated with the cavity;

two first structural members;

a second structural member;

the first structural member is provided with a first air flow channel, the extending direction of the first air flow channel is parallel to the extending direction of the cavity, and the first air flow channel is communicated with two side spaces which are separated by the cavity where the first structural member is located; a second airflow channel is arranged on the second structural part, the extending direction of the second airflow channel is vertical to the extending direction of the cavity, and the second airflow channel is communicated with two side spaces separated by the cavity where the second structural part is located;

a body member having a transmission member capable of being driven by a motor and disposed in the cavity;

the two first structural components are respectively arranged at two sides of the machine body component, are positioned between the machine body component and the shell, and are used for fixing the outer side walls at two sides of the machine body component with the corresponding local parts of the cavity wall; the second structural member is positioned between the tail end of the machine body component and the shell, and the tail end of the machine body component is fixed with the corresponding local part of the cavity wall through the second structural member;

a void is formed between the body component and the cavity wall.

Further, the first structural member and the second structural member are elastic components,

the elastic component is an elastic rubber component or a metal spring, the elastic rubber component comprises an elastic rubber body and an airflow channel, and the airflow channel is positioned in the middle of the elastic rubber body and communicates the two side spaces of the gap position of the elastic rubber body.

Further, the hand-held power tool also comprises a motor outer cover, the motor outer cover comprises,

the front end cover and the rear end cover are buckled to form a cavity capable of containing a motor, the front end cover is provided with a second air inlet which is communicated with the cavity of the motor, and a second structural member is positioned between the rear end cover and the cavity wall;

a second air outlet is formed in the front end cover and communicated with a gap between a stator and a rotor of the motor, and the second air outlet is located in the extending direction of the first air outlet.

Furthermore, the positioning component is arranged in the cavity of the shell and positioned between the second structural component and the cavity wall, the extending direction of the positioning component is vertical to the extending direction of the cavity, and the positioning component is fixed on the cavity wall;

one end of the second structural member is fixed on the rear end cover, and the other end of the second structural member is fixed on the positioning component.

Furthermore, a through hole is formed in the positioning component, the axis of the through hole is parallel to the extending direction of the cavity, and the through hole is communicated with two side spaces which are separated from the cavity where the positioning component is located.

Furthermore, the positioning component is a first positioning component which is arranged on the cavity wall, and the first positioning component and the cavity wall are integrally formed or detachably connected;

the first positioning part is provided with a plurality of through holes which are symmetrically arranged on the first positioning part.

Further, the positioning component is a second positioning component, and the second positioning component comprises a positioning piece and a guide piece;

the positioning piece is arranged on the cavity wall and extends towards the center of the cavity, the extending direction of the positioning piece is vertical to the extending direction of the cavity, and the positioning piece comprises a concave cambered surface;

the guide piece comprises a hollow cylinder, and a convex cambered surface is arranged on the outer wall of the hollow cylinder;

one end of the second structural member is fixed on the rear end cover, the other end of the second structural member is fixed on the end face of the hollow column body, and the convex arc face of the guide member is abutted to the concave arc face of the positioning member.

Furthermore, a first air inlet is arranged on the shell, and the first air inlets comprise a plurality of groups and are symmetrically arranged according to the horizontal axis of the machine body component.

The utility model discloses a technological effect does:

(1) through the arrangement of the two first structural members and the second structural member, a gap is formed between the machine body part and the cavity wall, airflow channels are arranged on the first structural member and the second structural member, hot airflow is in a circulating state in the cavity and cannot be blocked, and the hot airflow in the cavity can be discharged in time through the first air outlet in the shell, so that the purpose of rapid heat dissipation is achieved.

(2) First structure and second structure are elastomeric element, realize buffer function to the fuselage part of vibration, can directly use coil spring simultaneously, and the market can be bought, and the instrument cost of manufacture is low.

(3) For the motor with the motor outer cover, a second air outlet is formed in the front end cover of the motor, the second air outlet is located in the extending direction of the first air outlet, heat generated inside the motor is timely discharged by a rotor fan of the motor, hot air flows out of the cavity body sequentially through the second air outlet and the first air outlet, negative pressure is formed inside the cavity body, external cold air rapidly circulates to enter the hot air flow inside the cavity body to generate heat exchange, and the external cold air is discharged from the first air outlet, and the heat dissipation efficiency of the handheld power tool can be improved through circulating air flow.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention in any way. Wherein:

FIG. 1 is a schematic view of the internal structure of a hand-held power tool provided by the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a schematic view of the drive unit of FIG. 1;

FIG. 4 is a schematic view of another internal configuration of the hand-held power tool provided by the present invention;

FIG. 5 is a cross-sectional view of FIG. 4;

FIG. 6 is a schematic view of the internal structure of a hand-held power tool having a second positioning member;

FIG. 7 is a schematic view of the guide in the second positioning member of FIG. 6;

FIG. 8 is a cross-sectional view of the housing of FIG. 6 not fully installed;

fig. 9 is a cross-sectional view of the housing of fig. 6 fully installed.

Reference numerals:

1. the air conditioner comprises a shell, a cavity wall, a motor, a stator, a rotor, a motor outer cover, a gap, a body part, a transmission part, a working head, a front end cover, a rear end cover, a first structural component, a second structural component, a first air outlet, a second air outlet, a first positioning part, a second positioning part, a concave cambered surface, a guide part, a convex cambered surface, a first air flow channel, a second air flow channel, a positioning part, a through hole, a first air inlet, a second air inlet, a fan and a fan, wherein the cavity is 2, the cavity wall is 3, the cavity wall is 4, the motor is 41, the stator is 42, the rotor is 43, the motor outer cover is 5.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings in conjunction with embodiments. Each example is provided by way of explanation of the invention and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.

The utility model provides an improve inside radiating efficiency's of instrument handheld power tool, as shown in fig. 1 and fig. 2, fig. 1 is handheld power tool's inner structure schematic diagram, and fig. 2 is the section view of fig. 1. The hand-held power tool comprises a housing 1, the housing 1 forms a cavity 2, the cavity 2 has an extending direction and has a cavity wall 3, and the extending direction of the cavity is shown as A in figure 1. The housing 1 has a first air outlet 12, and the first air outlet 12 is communicated with the cavity 2. Two first structural members 10, a second structural member 11 and a body component 6 are provided within the chamber 2. The first structural member 10 is provided with a first air flow passage 20, the extending direction of the first air flow passage 20 is parallel to the extending direction A of the cavity 2, and the hot air flow in the gap 5 on one side of the first structural member 10 passes through the first air flow passage 20 to reach the gap 5 on the other side of the first structural member 10. The second structural member 11 is provided with a second air flow channel 21, the extending direction of the second air flow channel 21 is perpendicular to the extending direction A of the cavity 2, and the hot air flow in the gap 5 on one side of the second structural member 11 passes through the second air flow channel 21 to reach the gap 5 on the other side of the second structural member 11.

As shown in fig. 3, the body component 6 includes a motor 4 and a transmission member 61, the motor 4 drives the transmission member 61 to rotate, and the transmission member 61 adjusts the power output by the motor 4, wherein the adjustment includes adjusting the rotation speed of the working head 7 and forward and reverse rotation of the working head 7. Along the extending direction a of the cavity 2, two first structural members 10 are respectively arranged on two sides of the body part 6 and located between the body part 6 and the housing 1, outer side walls of two sides of the body part 6 are respectively fixed with the corresponding local part of the cavity wall 3 through one first structural member 10, and the corresponding direction is perpendicular to the extending direction a of the cavity. The second structural member 11 is located between the end of the body member 6 and the housing 1, and the end of the body member 6 is the end of the motor 4 away from the working head 7. The end of the fuselage section 6 is fixed to the corresponding local portion of the cavity wall 3 by means of a second structural element 11, the corresponding direction being parallel to the direction a of extension of the cavity 2. The gap 5 is formed between the fuselage section 6 and the cavity wall 3 by the bracing fastening of two first structural elements 10 and one second structural element 11.

In the scheme, along the extending direction a of the cavity 2, a first structural member 10 is arranged between the outer side walls of the two sides of the body part 6 and the shell 1, a second structural member 11 is arranged between the tail end of the body part 6 and the shell 1, and the two first structural members 10 and the second structural member 11 form three-point support. The first structural member 10 is provided with a first air flow passage 20, the second structural member 1 is provided with a second air flow passage 21, and the three-point support, the first air flow passage 20 and the second air flow passage 21 enable a gap 5 for circulating hot air flow to be formed between the machine body part 6 and the shell 1. During operation of the hand-held power tool, heat generated by the work and vibration of the body member 6 is dissipated from the body member 6 and collected in the gap 5 between the body member 6 and the housing 1 to form a hot air flow. The motor 4 of the machine body component 6 can automatically dissipate heat, and heat generated inside the motor 4 can be dissipated in time. The motor 4 dissipates heat, and hot air flow overflowing the motor 4 is discharged out of the cavity 2 through the first air outlet 12 on the shell 1. The motor 4 dispels the heat for a long time, and the inside negative pressure environment that forms of cavity 2 of handheld power tool, outside cold air gets into cavity 2. The cold air enters the gap 5 between the body part 6 and the shell 1, along the extending direction A of the cavity 2, a part of the cold air flows in the gaps 5 at two sides of the body part 6, passes through the first air flow channel 20 on the first structural member 10 to generate heat exchange with the hot air flow in the gaps 5 at two sides of the body part 6, and the hot air flow is discharged out of the cavity 2 through the first air outlet 12 to carry most of the heat in the cavity 2. A part of the cold air passes through the first air flow channel 20 to the position of the gap 5 of the second structural member 11, the cold air reaching the position of the gap 5 of the second structural member 11 passes through the second air flow channel 21, flows in the gap 5 between the end of the fuselage part 6 and the outer shell 1, exchanges heat with the hot air flow in the gap 5, and is exhausted out of the cavity 2 through the first air outlet 12 to carry out part of the heat in the cavity 2. The cold air entering the cavity 2 is filled in the gap 5 between the machine body part 6 and the shell 1, and the cold air and the hot air flow in the gap 5 generate heat exchange to discharge the heat generated in the machine body part 6 in time, so that the aim of quickly cooling the handheld power tool in operation is fulfilled.

In one embodiment of the present invention, as shown in fig. 4 and 5, the first structural member 10 and the second structural member 11 are elastic members. The resilient member acts as a connection between the body member 6 and the housing 1 when the hand-held power tool is in operation. The elastic properties of the elastic member itself provide a damping effect for the vibrating body member 6, reducing vibrations during operation of the hand-held power tool. As shown in fig. 4, the first structural member 10 is an elastic rubber component, the elastic rubber component includes an elastic rubber body 25 and a first air flow channel 20, the elastic rubber body 25 is a columnar structure, the first air flow channel 20 penetrates through the middle of the elastic rubber body 25, and the extending direction of the first air flow channel 20 is parallel to the extending direction a of the cavity 2. The second structural member 11 is a metal spring, specifically a coil spring, and a gap exists in a coil structure of the coil spring, and the gap serves as a second airflow channel 21. As shown in fig. 5, the first structural member 10 and the second structural member 11 are both coil springs. As shown in fig. 1 and 2, the first structural member 10 is an elastic rubber member having a first air flow passage 20, and the second structural member 11 is a rigid support member having a second air flow passage 21.

In one embodiment of the present invention, as shown in fig. 1 and 2, the hand-held power tool further includes a motor cover 43. The motor outer cover 43 comprises a front end cover 8 and a rear end cover 9, and the front end cover 8 and the rear end cover 9 are buckled to form a cavity capable of containing the motor 4. As shown in fig. 5, the front end cover 8 has a second air inlet 26, the second air inlet 26 is communicated with the cavity of the motor 4, and the extending direction of the second air inlet 26 is parallel to the extending direction of the cavity of the motor 4. The second structural member 11 is located between the rear end cap 9 and the cavity wall 3. A second air outlet 13 is formed in the front end cover 8, the extending direction of the second air outlet 13 is perpendicular to the extending direction of the cavity of the motor 4, the second air outlet 13 is communicated with the gap between the stator 6 and the rotor 7 of the motor 4, and the second air outlet 13 is located in the extending direction of the first air outlet 12.

As shown in fig. 1 and 2, in operation of the hand-held power tool, the motor 4 generates heat, the fan 27 blows air toward the axial gap position of the rotor 42 and the stator 41, and generates an air flow at the axial gap position of the rotor 42 and the stator 41, the air flow carries away heat from the rotor 42 and the stator 41, and the hot air flows through the second air outlet 13 and is discharged from the first air outlet 12. As shown in fig. 3, the hot air flow is continuously exhausted to form a negative pressure environment in the cavity 2, so that the cold air enters the cavity 2 from the gap between the casing 1 and the body component 6 or the first air inlet 24 on the casing 1, and the cold and hot air flow is formed in the cavity 2 to circulate alternately. Cool air enters the interspace 5 between the fuselage element 6 and the outer shell 1. The cold air enters into the gap 5 to exchange heat with the hot air flow. The air circulates in the gap 5 through the first air flow path 20 of the first structural member 10 and the second air flow path 21 of the second structural member 11 under negative pressure. One part of the hot air after heat exchange overflows the cavity 2 through the first air outlet 12 on the shell 1, and the other part of the hot air enters the interior of the motor 4 for secondary heat exchange through the second air inlet 26 on the front end cover 8. The hot air after the secondary heat exchange overflows the cavity 2 through the first air outlet 12 on the shell 1 through the second air outlet 13 on the front end cover 8, and the gaps 5 in the cavity 2 and the hot air in each gap can be rapidly and circularly discharged out of the cavity 2.

In one embodiment of the present invention, as shown in fig. 1, a positioning member 22 is disposed between the second structural member 11 and the housing 1. The positioning part 22 is used as a support, one end of the second structural member 11 is fixed on the rear end cover 9 of the motor 4, and the other end of the second structural member 11 is fixed on the positioning part 22. The extending direction of the positioning member 22 is perpendicular to the extending direction a of the chamber 2, and the positioning member 22 is fixed to the chamber wall 3. The positioning member 22 is integrally formed with the housing 1 or assembled from a plurality of parts. In order to prevent the positioning member 22 from blocking the position of the gap 5, the positioning member 22 is provided with a through hole 23, and the axis of the through hole 23 is parallel to the extending direction of the cavity 2. The through holes 23 communicate with the space on two sides separated by the position of the gap 5 where the positioning part 22 is located, so that hot air can pass through the positioning part 22. As shown in fig. 4, the positioning component 22 is a first positioning component 14, the first positioning component 14 is integrally formed with the housing 1, a plurality of through holes 23 are formed in the first positioning component 14, and the plurality of through holes 23 are symmetrically arranged along a horizontal axis of the cavity 2.

In an embodiment of the present invention, as shown in fig. 6, the positioning component 22 between the second structural component 11 and the housing 1 is a second positioning component 15, and the second positioning component 15 includes a positioning member 16 and a guiding member 18. As shown in fig. 7, which is a schematic structural diagram of the guide member 18, the core of the guide member 18 is a hollow cylinder, a convex arc surface 19 is provided on an outer wall of the hollow cylinder, one end of the second structural member 11 is fixed on the rear end cover 9, and the other end of the second structural member 11 is fixed on an end surface of the hollow cylinder. As shown in fig. 8, the positioning member 16 is integrally formed with the housing 1 and extends toward the center of the cavity 2, and the extending direction of the positioning member 16 is perpendicular to the extending direction a of the cavity 2. The positioning member 16 has a concave arc surface 17, and the convex arc surface 19 of the guide member 18 is assembled in abutment with the concave arc surface 17 of the positioning member 16. Fig. 9 is a schematic structural view of the interior of the hand-held power tool after the positioning member 16 and the guide member 18 are assembled. In fig. 9, the second structural member 11 is a coil spring, the assembled second positioning member 15 compresses the coil spring along the spring axis, the convex arc surface 19 on the guiding member 18 moves along the concave arc surface 17 under the reaction force of the pressure, the guiding member 18 drives the second structural member 11 and the body component 6 to move until the axis of the body component 6 is parallel to the axis of the cavity 2, and the assembly of the body component 6 is completed.

The utility model discloses an implementation mode, as shown in fig. 5, be equipped with first air inlet 24 on the shell 1, first air inlet 24 includes the multiunit, according to the horizontal axis symmetry setting of fuselage part 6. The position of the first air inlet 24 can be set according to actual needs and the specific shape structure of the power tool.

The above is merely a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A hand-held power tool, comprising,

the shell forms a cavity, the cavity is provided with an extending direction and a cavity wall, the shell forms a first air outlet, and the first air outlet is communicated with the cavity;

two first structural members;

a second structural member;

the first structural member is provided with a first air flow channel, the extending direction of the first air flow channel is parallel to the extending direction of the cavity, and the first air flow channel is communicated with two side spaces which are separated by the cavity where the first structural member is located; a second airflow channel is arranged on the second structural part, the extending direction of the second airflow channel is vertical to the extending direction of the cavity, and the second airflow channel is communicated with two side spaces separated by the cavity where the second structural part is located;

a body member having a transmission member capable of being driven by a motor and disposed in the cavity;

the two first structural components are respectively arranged at two sides of the machine body component and positioned between the machine body component and the shell, and the outer side walls of the two sides of the machine body component are respectively fixed with the corresponding local parts of the cavity wall through the first structural components; the second structural part is positioned between the tail end of the machine body part and the shell, and the tail end of the machine body part is fixed with the corresponding local part of the cavity wall through the second structural part;

a void is formed between the body component and the cavity wall.

2. The hand-held power tool of claim 1,

the first structural member and the second structural member are elastic components,

the elastic component is an elastic rubber component or a metal spring, the elastic rubber component comprises an elastic rubber body and an airflow channel, and the airflow channel is positioned in the middle of the elastic rubber body and communicates the two side spaces of the gap position of the elastic rubber body.

3. The hand-held power tool of claim 1,

the hand-held power tool also comprises a motor outer cover, the motor outer cover comprises a motor outer cover,

the front end cover and the rear end cover are buckled to form a cavity capable of containing the motor, a second air inlet is formed in the front end cover and is communicated with the cavity of the motor, and the second structural member is positioned between the rear end cover and the cavity wall;

and a second air outlet is formed in the front end cover and communicated with a gap between a stator and a rotor of the motor, and the second air outlet is positioned in the extending direction of the first air outlet.

4. The hand-held power tool of claim 3, further comprising,

the positioning component is arranged in the cavity of the shell and positioned between the second structural component and the cavity wall, the extending direction of the positioning component is vertical to the extending direction of the cavity, and the positioning component is fixed on the cavity wall;

one end of the second structural member is fixed on the rear end cover, and the other end of the second structural member is fixed on the positioning component.

5. The hand-held power tool of claim 4,

the positioning component is provided with a through hole, the axis of the through hole is parallel to the extending direction of the cavity, and the through hole is communicated with the two side spaces separated by the cavity where the positioning component is located.

6. The hand-held power tool of claim 5,

the positioning component is a first positioning component, the first positioning component is arranged on the cavity wall, and the first positioning component and the cavity wall are integrally formed or detachably connected;

the first positioning part is provided with a plurality of through holes, and the through holes are symmetrically arranged on the first positioning part.

7. The hand-held power tool of claim 4,

the positioning component is a second positioning component which comprises a positioning piece and a guide piece;

the positioning piece is arranged on the cavity wall and extends towards the center of the cavity, the extending direction is perpendicular to the extending direction of the cavity, and the positioning piece comprises a concave arc surface;

the guide piece comprises a hollow cylinder, and a convex cambered surface is arranged on the outer wall of the hollow cylinder;

one end of the second structural member is fixed on the rear end cover, the other end of the second structural member is fixed on the end face of the hollow column body, and the convex arc face of the guide member is abutted to the concave arc face of the positioning member.

8. The hand-held power tool of claim 1,

the shell is provided with a first air inlet, the first air inlet comprises a plurality of groups, and the groups are symmetrically arranged according to the horizontal axis of the machine body component.

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