CN203222757U

CN203222757U - Handheld electric driven tool

Info

Publication number: CN203222757U
Application number: CN 201320156736
Authority: CN
Inventors: 聂方杰; 郭建朋
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2013-03-29
Filing date: 2013-03-29
Publication date: 2013-10-02
Anticipated expiration: 2023-03-29

Abstract

The utility model provides a handheld electric driven tool, comprising a shell, a work part realizing the concrete function, and a battery mounted on the shell and having a capacity more than 170 watt hours. The handheld electric driven tool disclosed by the utility model has the battery with a larger capacity, thus providing enough energy for a machine, prolonging the use time and reducing the replacing time of a battery bag by a user, and the operation is more convenient and fast.

Description

Hand held electric tool

Technical field

The utility model relates to a kind of hand held electric tool, particularly a kind of garden class hand held electric tool.

Background technology

The hand held electric tool of current battery power supply is widely used owing to its portability, especially garden class instrument, such as hair-dryer, hair-dryer is mainly used in blowing ground, fallen leaves and small-sized rubbish near court and the grandstand, obtain through experiment, in order to blow afloat the rubbish in a large amount of fallen leaves in ground and some cracks, usually need the air quantity of hair-dryer bigger, working time is longer, hand-held direct current hair-dryer in the market is because the limitation of aspect such as the little and hair-dryer complete machine air-out efficient of battery capacity is lower, cause the hair-dryer air quantity less, the working time is shorter.

Summary of the invention

The purpose of this utility model is to provide a kind of working time long hand held electric tool.

For reaching above-mentioned purpose, a kind of hand held electric tool of the utility model comprises housing, realizes operate portions and the battery of concrete function that described battery is installed on the housing, and described battery capacity is greater than 170wh.

Further, described hand held electric tool is hand blower.

Further, described operate portions comprises a letter road assembly and a blower, and described letter road assembly comprises the letter road that links to each other with housing and be installed to motor and fan in the letter road that described housing is connected on the blower by letter road assembly.

Further, the battery capacity of described hand held electric tool is between 170wh-400wh.

Further, the air quantity of described hand held electric tool is between 430cfm-700cfm, and the working time is greater than 5min.

Further, described hand held electric tool comprises a handle, described handle comprises a grip part, a battery installation section and a speed governing portion, described holding area is between battery installation section and speed governing portion, and described battery installation section is provided with the battery installation component for the described battery of installation or removal.

Further, described battery installation component comprise a battery snap close, with the button release of described battery snap close interlock, described button release can drive the battery snap close to be separated with battery.

Further, described battery installation component also comprises an ejection head that is arranged on the housing, and described ejection head is connected with an elastic component, and can rotate with respect to housing.

Further, described fan links to each other with motor, and described motor is brshless DC motor, and described fan is aerofoil fan, and the diameter of described brshless DC motor is not more than 35mm, and the external diameter of described aerofoil fan is between 85mm-140mm.

Further, described hand held electric tool comprises an air intake that is arranged on the housing, defined a central axis at described blower, described blower has an air outlet, along the direction of axis the rear end of fan near the flow cross section in the air channel at air intake position greater than blower on the area of flow cross section at air outlet position, form a circulating face between described inner walls and the fan hub, the ratio on the blower between the flow cross section of the flow cross section at air outlet position and fan present position circulating face is more than or equal to 0.8.

The battery capacity of hand held electric tool of the present utility model for machine provides enough energy, has prolonged service time greater than 170wh, reduces the number of times that the user changes power brick, and it is more convenient to operate.

Description of drawings

Fig. 1 is the perspective view of the hand held electric tool in the utility model embodiment;

Fig. 2 is the front view after the hand held electric tool in the utility model embodiment removes partial shell;

Fig. 3 is the front view of the hand held electric tool in the utility model embodiment;

Fig. 4 is the vertical view of the hand held electric tool in the utility model embodiment;

Fig. 5 is the structural representation that the air intake box of the hand held electric tool in the utility model embodiment is connected with letter road assembly;

Fig. 6 is the structural representation of the handle of the hand held electric tool in the utility model embodiment;

Fig. 7 is the sectional view of the letter road assembly of the hand held electric tool in the utility model embodiment;

Fig. 8 is the stereogram after the letter road assembly of the hand held electric tool in the utility model embodiment removes part letter road and tube connector;

Fig. 9 is the curve of the hand held electric tool fan blade external diameter in the utility model embodiment and the efficiency function relation of drying.

The specific embodiment

For clearer understanding technology contents of the present utility model, especially exemplified by the specific embodiment and cooperate appended illustrate as follows.

Please refer to Fig. 1 and Fig. 2, in the utility model embodiment, hand held electric tool 10 is hand blower, it comprises housing 11, air intake box 12, handle 13, Control Component 14, battery 15, is used for realizing the operate portions (figure is mark not) of concrete function, above-mentioned operate portions comprises a letter road assembly 17 and a blower 19, letter road assembly 17 and battery 15 corresponding both sides that are positioned at housing 11 respectively wherein, handle 13 is arranged on the housing 11, housing 11 links to each other with blower 19 by letter road assembly 17, and air intake box 12 is positioned at body 11 inside.

Please also refer to Fig. 3, housing 11 includes container cavity 110, installation portion 111, main air inlet 112, auxiliary air intake 113, sidepiece air intake 114 and sweep 115, container cavity 110 is formed in the housing 11, air intake box 12 is installed in the container cavity 110, and letter road assembly 17 1 ends are fixedly mounted in the installation portion 111.Main air inlet 112 and auxiliary air intake 113 all are arranged on the bottom of housing 11, sidepiece air intake 113 is arranged on the sidewall of housing 11, air-flow enters by main air inlet 112 or auxiliary air intake 113, through flowing into the letter road assembly 17 from installation portion 111 after the guiding of sweep 115.Sidepiece air intake 114 has the effect of auxiliary air intake, can play better air intake effect, also can not need sidepiece air intake 114 certainly.

Please refer to Fig. 5, air intake box 12 includes bottom air inlet portion 120, inlet section, rear portion 121, sidepiece inlet section 122 and air outlet 123, wherein bottom air inlet portion 120 is fence shape structure with inlet section, rear portion 121, and a ramp structure corresponding with sweep 115 on the housing 11 is arranged in inlet section, rear portion 121, the air outlet 123 of air intake box 12 is connected with the air intake (figure is mark not) of letter road assembly 17, this moment, air intake box 12 formed the unit 18 that can work independently with letter road assembly 17, bottom air inlet portion 120 on the air intake box, inlet section, rear portion 121, sidepiece inlet section 122 forms a plurality of blowing passages with air outlet 123 respectively, therefore no matter how housing 11 changes, can pack in the housing and form the blowing passage in unit 18 as long as can work independently, just machine can be realized blowing function.Can under the constant situation in internal work unit, change the external form of hand held electric tool 10 fast in this way.In embodiment of the present utility model, main air inlet 112 on the housing 11 has formed the first blowing passage with bottom air inlet portion 120 and the air outlet 123 of blowing box 12, auxiliary air intake 113 on the housing 11 has formed the second blowing passage with inlet section, rear portion 121 and the air outlet 123 of blowing box 12, and the sidepiece air intake 114 on the housing forms the 3rd blowing passage with sidepiece inlet section 122 and the air outlet 123 of blowing box 12.

Please also refer to Fig. 1, Fig. 2, Fig. 4 and Fig. 6, handle 13 is used for gripping hand held electric tool 10, it is positioned at the top of housing 11 and battery 15 and is installed on the sweep 115 of housing 11, handle 13 comprises grip part 130, battery installation section 131 and speed governing portion 132, and wherein grip part 130 is between battery installation section 131 and speed governing portion 132.

In the utility model embodiment, on blower 19, alongst defined an axis L 1, the center of gravity G of hand held electric tool 10 integral body is positioned on the plane P 1, and plane P 1 is vertical with the ground P2 of work, and is simultaneously parallel with axis L1.Housing 11, battery 15, letter road assembly 17 and blower 19 roughly are located along the same line, and the grip part 130 on the handle 13 is distributed in the both sides of above-mentioned plane P 1, preferably grip part 130 symmetries are distributed in plane P 1 both sides.Compact conformation like this near the centroidal distance grip part, has reduced and has in use overcome the required power of hand held electric tool 10 deflections, increases hand-held comfort level, reduces hand-held sense of fatigue in long-time use.Battery can certainly be arranged on above or below the housing 11, housing 11, letter road assembly 17 and blower 19 roughly are located along the same line, grip part 130 on the handle 13 is distributed in the both sides of plane, center of gravity place (figure is mark not), described plane is parallel with the axis of blower 19, and vertical with work ground P2, above-described work ground is defined as a horizontal plane.

Control Component 14 is used for switching and the rotating speed size of control hand held electric tool 10, it comprises the trigger 140 of control hand held electric tool 10 switchings, the lock-button 141 that prevents hand held electric tool 10 error startings, control hand held electric tool 10 with the amplification button 142 of maximum (top) speed running and the speed governing button 143 of adjusting hand held electric tool 10 motors 172 rotating speeds, and wherein speed governing button 143 is positioned in the speed governing portion 132.For the convenience of operating, wherein trigger 140, lock-button 141 and amplification button 142 all are arranged on the grip part 130, such position arranges and can guarantee that the operator can amplify button 142 with the thumb operation in by trigger action 140, under high speed blowing condition, work for a long time if desired in addition, the operator also can press amplification button 142 and lock-button 141 by palm simultaneously when holds handle 13, press trigger squeeze 140 by finger part in addition, so only can finish the startup of hand held electric tool 10 and keep its continuous running with the running speed of maximum by one-handed performance, reduce the fatigue of hand in the use, increase the gripping comfort level.Wherein lock-button 141 only is the auxiliary switch spare that arranges in order to prevent maloperation from starting hand held electric tool 10, can imagine not to have lock-button 141 yet, only finishes the start-up course of hand held electric tool 10 and keeps its continuous running by trigger 140 and amplification button 142.

Battery 15 is installed on the housing 11 by battery installation section 131, be used for providing power supply to hand held electric tool 10, housing 11 is provided with the ejection that cooperates with battery 15 116 and battery mount pad (figure is mark), ejecting 116 is connected with spring 117, and housing rotation relatively, when battery 15 is installed on the housing 11, the front end of battery 17 promotes to eject 116 and overcomes the elastic forces rotation of spring 117 and be displaced to a precalculated position, when dismounting during battery 15, eject 116 and under the resilient force of spring 117, the direction of battery 15 towards dismounting ejected.

Battery installation section 131 is provided with battery snap close 1311, battery snap close 1311 is used for battery 15 is locked at housing 11, interlock is provided with button release 1312 on the battery snap close 1311, separate with battery 15 by the drive battery snap close of pressing or promote button release 1312 linkages 1311, battery 15 is ejecting under 116 the effect and can disassemble easily then.Certainly, battery installation section 131 also can be arranged on the housing 11, as long as can play the function on the battery mount pad that when battery 15 is installed it is locked at setting on the housing 11.

Please refer to Fig. 7 and Fig. 8, letter road assembly 17 comprises the tube connector 170 that links to each other with blower 19, the letter road 171 that links to each other with housing 11, and motor 172 and fan 173, motor 172 is connected with trigger 140 on the Control Component 14 by lead, tube connector 170 and the 171 mutual clampings of letter road, be provided with the support ring 174 that holds motor 172 in tube connector 170 and the letter road 171, motor 172 is installed in the support ring 174, fan 173 links to each other with the output shaft of motor 172, equal one-body molded wind-guiding muscle 175 that some divergent shapes are arranged in tube connector 170 and the letter road 171, wind-guiding muscle 175 1 ends are connected on the inwall in tube connector 170 or letter road 171, the other end is connected on the support ring 174, and wherein at least one wind-guiding muscle 175 is provided with the passage 176 that power supply machine 172 leads pass.So not only increased the reliability of lead location but also reduced windage, and do not increased new part, fixing cord is simple, reliable, convenient during assembling.Be understandable that, if letter road 171 length are enough, also can not pass through tube connector 170, directly support ring 174 and wind-guiding muscle 175 are set on the letter road 171.Letter road 171 has an inlet section 1711, in order to reduce the noise at 1711 places, inlet section, letter road, inlet section, letter road 1711 is arranged for ease of the lip limit structure of wind-guiding, and above-mentioned lip limit structure is can be with letter road 171 integrally formed or form independent part and be installed on the letter road 171.

In the utility model embodiment, fan 173 is aerofoil fan, motor 172 is brshless DC motor, fan 173 is driven by motor 172, it comprises a wheel hub 1731 that is installed on the electric machine rotational axis (figure is mark not), a plurality of blades 1732 that are installed on the above-mentioned wheel hub 1731, wherein blade 1732 can be one-body molded with wheel hub 1731, also can be to be assembled into together after separately being shaped.

Fan 173 is provided with radome fairing 177 near an end of housing 11, motor 172 is connected fan 173 near an end of blower 19, because fan 173 is aerofoil fan, after air-flow enters fan 173 by the first blowing passage and second, third blowing passage, the axial wind-guiding muscle 175 that passes through under the effect of fan 173, and flow in the blower 19.In the utility model embodiment, support ring 174 comprises accommodation section 1741 and the air dam 1742 that holds motor 172, the front end perforate of accommodation section 1741 (figure is mark not), air dam 1742 is pyramidal structure and one-body molded with accommodation section 1741, air dam 1742 is arranged on an end of close blower 19 on the support ring 174, air dam 1742 is provided with some fresh air inlets (figure is mark not), is used for cooling air and flows into.In the blowing process, because the air pressure of motor 172 peripheries is than near the air pressure height the fan 173, under action of pressure, produce time air-flow, inferior air-flow flows into support ring 174 inside by the fresh air inlet on the air dam 1742, cooling motor 172 inside, final front end perforate by accommodation section 1741 is flowed out, and can play the effect of cooling motor 172 like this in the process of blowing again.

Please refer again to Fig. 3, for the ease of carrying, also be provided with the braces (not shown) on the hand held electric tool 10 of the present utility model, the braces two ends are connected respectively to two the lanyard holes 118,119 that are arranged on the housing 11, two lanyard holes 118,119 substantially the same to the distance at 130 centers, grip part, and the mid point of two lanyard holes 118,119 position lines be positioned at the machine gravity line near.

Hand-held direct current electric power tools 10 is mainly used in blowing ground, court and grandstand neighbouring fallen leaves and small-sized rubbish, obtain through investigation, in order to blow afloat the rubbish in a large amount of fallen leaves in ground and some cracks, need the air quantity of hand held electric tool 10 preferably to be greater than 395cfm usually.In the market power brick is installed in the hand-held direct current electric power tools 10 on the housing because the limitation of aspect such as battery capacity is little and electric tools 10 complete machine air-out efficient are lower, cause electric tools 10 to be difficult to reach air quantity greater than 395cfm, the working time is greater than the performance indications of 5min.Therefore, in order to reach bigger air quantity and higher blowing efficient, need parameter and the air channel design of battery capacity, brshless DC motor, aerofoil fan be optimized.

In order to reach desirable airflow value and the working time, the capacity of battery is usually greater than 170wh, generally the capacity of battery is directly proportional with the weight of itself, for hand held electric tool 10, because the weight requirement to complete machine, the preferable range of power brick capacity if such setting is because the power brick capacity is too little on the one hand, can not satisfy the requirement of air quantity and working time between 170wh-400wh; And if the power brick capacity is too big on the other hand, in use Shou Chi sense of fatigue can increase, and is unfavorable for that the operator works long hours.

Table 1 has been listed battery capacity when 200wh and 300wh, the effective time of hand held electric tool 10 when maximum quantity of wind operation and the operation of minimum air quantity.From table 1 also as can be seen, battery capacity one regularly, air quantity and working time are inversely proportional to, and that is to say that air quantity is more big, the working time is more short.According to ergonomics, and draw by a large amount of simulated experiment analyses of bearing usage degree to complete machine weight, people, the performance parameter that is fit to the hand-held direct current electric power tools 10 of popular client's instructions for use is: air quantity is between 385cfm-700cfm, working time is between the 20min-75min, be understandable that, the battery of above-mentioned capacity can be applied on other instruments of garden class, as products such as pruner, grass-mowing machine, hay mover, chain saws equally, can play the purpose of lengthening working hours equally.

Table 1

Battery capacity	Maximum quantity of wind	Minimum air quantity
			200wh	36min	120min
300wh	54min	180min

Under the certain situation of battery capacity, in order to obtain an air quantity greater than the hand-held direct current electric power tools 10 of 395cfm, higher blowing efficient, also need parameter and the air channel design of brshless DC motor, aerofoil fan are optimized.

Please refer again to Fig. 7 and Fig. 8, motor 172 is received in the support ring 174 that arranges on letter road 171 and the tube connector 170, the wheel hub 1731 of aerofoil fan 173 is installed on the axis of rotation (figure is mark not) of motor 172, according to aerodynamic principle, for reducing windage, improve wind speed, the outline of radome fairing 177, wheel hub 1731 and support ring 174 be designed to one streamlined, so motor 172 diameter have also determined the diameter of wheel hub 1731 simultaneously.In addition, when the design aerofoil fan, the ratio of the root diameter (RD) of blade and top diameter, being the fan hub diameter and the ratio of blade external diameter, being called for short hub ratio below, is a very important parameter, same impeller outer diameter, wheel hub leaflet length of a film more is applicable to the axial flow blower of low pressure and mass flow, and between 0.25-0.45, the air-out efficient of fan blade is than higher through the sunykatuib analysis hub ratio.If therefore motor diameter is bigger, corresponding hub diameter also can be bigger, for the hub ratio parameter is remained in the optimum interval, thereby obtain higher air-out efficient, the corresponding increase of the diameter of blade, and then cause letter road volume to increase, the volume of complete machine also increases, and is that the operational comfort in configuration design or the actual use all can affect adversely like this, and therefore preferred motor diameter is not more than 35mm, the complete machine quality is lighter like this, and it is littler to take up space.Scope according to hub ratio, can further draw the scope of blade external diameter between 78mm-140mm, blowing efficient is higher like this, as shown in Figure 9, C1 and C2 are respectively air quantity when 560cfm and 500cfm, curve map through functional relation between analogue simulation modeling analysis gained blade external diameter and the blowing efficient, the blade external diameter is when 85mm-140mm as seen from the figure, blowing efficient is best, and the blowing definitions of efficiency here is the merit of air current flow generation and the ratio that fan blade is rotated the merit that consumes.

Further, because the diameter of motor is less than 35mm, therefore the ratio of air quantity and motor diameter compared with common hand held electric tool 10 greater than 12cfm/mm, and the hand held electric tool 10 in the utility model obtains more powerful blowing effect by the motor of small size.

Below air channel of the present utility model design is described in detail, please refer again to Fig. 2, direction along axis L1, the rear end of fan 173 near the flow cross section S1 in the air channel at air intake 112 positions greater than blower 19 on the flow cross section S3 at air outlet 191 positions, and between letter road 171 inwalls and fan hub 1731, form an annular circulating face (figure is mark not), ratio between the flow cross section S2 of the flow cross section S3 at air outlet 191 positions on the blower 19 and aerofoil fan 173 present positions annular circulating face more preferably greater than or equal 0.8, like this effective airflow characteristic that improves is set, improve blowing efficient.Simultaneously fan 173 is to outer contour L2 of 191 sections air channels definition of air outlet, and L1 and L2 have defined an angle.Preferably, angle between axis L1 and the outer contour L2 is less than 8 degree, and arranging like this is because angle is more big to form certain windage to air-flow, and the air flow losses of wind path wall increases like this, the loss of the high velocity air of circulation increases in the blower 19, causes the blowing efficient of complete machine to reduce.By above two Parameter Optimization, can realize that favourable air current flow situation realizes the less pressure loss simultaneously in blower 19, improve blowing efficient effectively.

In order to reach enough air outputs at air outlet 191 places, through the CFD(computational fluid dynamics) analyze and the test data summary, design bigger air outlet place area usually, preferred, the cross-sectional area at air outlet 191 positions is set to greater than 4300mm2.Certainly, along with the increase wind speed of blowing area can decrease, through the preferred air outlet area of practical operation is set to 4300mm ²To 8000mm ²

The improvement of the optimization of the parameter designing by the battery capacity in the utility model, brshless DC motor, aerofoil fan and air channel design, when battery capacity is between 170wh-400wh, the air quantity of hand held electric tool 10 all can reach more than the 395cfm, particularly when air quantity during at 430-700cfm, still can satisfy the working time greater than 5min.In the time of simultaneously can guaranteeing that electric tools 10 moves with maximum quantity of wind, the ratio of air quantity and input power is more than or equal to 0.7cfm/w, and blowing efficient obtains very big improvement.

Though the utility model discloses as above with preferred embodiment, so it is not in order to limit the utility model.Have in the technical field under the utility model and know the knowledgeable usually, in not breaking away from spirit and scope of the present utility model, when being used for a variety of modifications and variations.Therefore, protection domain of the present utility model is as the criterion when looking claims person of defining.

Claims

1. hand held electric tool comprises housing, realizes operate portions and the battery of concrete function that it is characterized in that: described battery is installed on the housing, and described battery capacity is greater than 170wh.

2. hand held electric tool according to claim 1, it is characterized in that: described hand held electric tool is hand blower.

3. hand held electric tool according to claim 1 and 2, it is characterized in that: described operate portions comprises a letter road assembly and a blower, described letter road assembly comprises the letter road that links to each other with housing and is installed to motor and fan in the letter road that described housing is connected on the blower by letter road assembly.

4. hand held electric tool according to claim 1 and 2, it is characterized in that: the battery capacity of described hand held electric tool is between 170wh-400wh.

5. hand held electric tool according to claim 2, it is characterized in that: the air quantity of described hand held electric tool is between 430cfm-700cfm, and the working time is greater than 5min.

6. hand held electric tool according to claim 2, it is characterized in that: described hand held electric tool comprises a handle, described handle comprises a grip part, a battery installation section and a speed governing portion, described holding area is between battery installation section and speed governing portion, and described battery installation section is provided with the battery installation component for the described battery of installation or removal.

7. hand held electric tool according to claim 6 is characterized in that: described battery installation component comprise a battery snap close, with the button release of described battery snap close interlock, described button release can drive the battery snap close to be separated with battery.

8. hand held electric tool according to claim 7, it is characterized in that: described battery installation component also comprises an ejection head that is arranged on the housing, described ejection head is connected with an elastic component, and can rotate with respect to housing.

9. hand held electric tool according to claim 3, it is characterized in that: described fan links to each other with motor, and described motor is brshless DC motor, and described fan is aerofoil fan, the diameter of described brshless DC motor is not more than 35mm, and the external diameter of described aerofoil fan is between 85mm-140mm.

10. hand held electric tool according to claim 9, it is characterized in that: described hand held electric tool comprises an air intake that is arranged on the housing, defined a central axis at described blower, described blower has an air outlet, along the direction of axis the rear end of fan near the flow cross section in the air channel at air intake position greater than blower on the area of flow cross section at air outlet position, form a circulating face between described inner walls and the fan hub, the ratio on the blower between the flow cross section of the flow cross section at air outlet position and fan present position circulating face is more than or equal to 0.8.