FAN

Abstract

A fan includes fan blades driven by an electric motor to rotate; a front shield at a front end of the fan blades; a rear shield at a rear end of the fan blades; and a battery pack coupling portion configured for mounting a battery pack. The electric motor of the fan has at least a first rotational speed at which the electric motor is operable, and when the electric motor moves at the first rotational speed, a total air volume formed by the fan is greater than or equal to 800 CFM and less than or equal to 1800 CFM.

Description

TECHNICAL FIELD

The present application relates to a fan, for example, a fan capable of being driven by direct current.

BACKGROUND

A fan is a machine that speeds up the flow of air by driving fan blades to rotate. An energy source of the fan may be a direct current power supply or an alternating current power supply, and the direct current power supply is generally embodied by a battery pack and is more convenient for a user to use who does not have easy access to the alternating current power supply. The fan is applicable to a variety of scenarios, and different application scenarios have different requirements on a wind speed, an air volume, and the like of the fan.

SUMMARY

The present application provides a fan so that a fan capable of being driven by direct current has a relatively large total air volume. The present application adopts the technical solutions below. A fan includes a battery pack coupling portion configured for mounting a battery pack; fan blades capable of being driven by an electric motor to rotate about a central axis; a front shield at a front end of the fan blades, where when the fan blades rotate, an airflow flows out through the front shield; and a rear shield at a rear end of the fan blades, where when the fan blades rotate, the airflow flows in through the rear shield. The electric motor of the fan has at least a first rotational speed at which the electric motor is operable, and when the electric motor moves at the first rotational speed, a total air volume formed by the fan is greater than or equal to 800 CFM and less than or equal to 1800 CFM.

A fan includes a battery pack coupling portion configured for mounting a battery pack; fan blades capable of being driven by an electric motor to rotate about a central axis; a front shield at a front end of the fan blades, where the front shield includes front air guide ribs and a shield edge, the front air guide ribs and the shield edge form multiple air outlet channels, and when the fan blades rotate, an airflow flows out through the air outlet channels; and a rear shield at a rear end of the fan blades, where when the fan blades rotate, the airflow flows in through the rear shield. An area formed by an inner edge of the shield edge of the front shield is defined as an effective air outlet area of the front shield. When the electric motor of the fan runs at a maximum rotational speed at which the electric motor is operable, the ratio of a total air volume (m³/min) formed by the fan to the effective air outlet area (m²) of the front shield is greater than or equal to 500 m/min and less than or equal to 2000 m/min.

A fan includes a battery pack coupling portion configured for mounting a battery pack; fan blades capable of being driven by an electric motor to rotate about a central axis; a front shield at a front end of the fan blades, where when the fan blades rotate, an airflow flows out through the front shield; and a rear shield at a rear end of the fan blades, where when the fan blades rotate, the airflow flows in through the rear shield. A rated voltage of the battery pack adapted to the fan is greater than or equal to 12 V and less than or equal to 80 V. The electric motor of the fan has at least a first rotational speed at which the electric motor is operable, and when the electric motor moves at the first rotational speed, a total air volume formed by the fan is greater than or equal to 800 CFM.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a fan;

FIG. 2 is a perspective view of the fan of FIG. 1 from another angle of view;

FIG. 3 is an exploded view of a partial structure of the fan of FIG. 1;

FIG. 4 is a plan view of fan blades in FIG. 3;

FIG. 5 is a plan view of a front shield in FIG. 3;

FIG. 6 is a plan view of a rear shield in FIG. 3; and

FIG. 7 is a side view of the fan of FIG. 1.

DETAILED DESCRIPTION

In the description of the present application, it is to be noted that orientations or position relations indicated by terms such as “center”, “upper”, “lower”, “left”, “right”, “front”, and “rear” are based on the drawings. These orientations or position relations are intended only to facilitate and simplify the description of the present application and not to indicate or imply that a device or element referred to must have such particular orientations or must be configured or operated in such particular orientations. Thus, these orientations or position relations are not to be construed as limiting the present application. Moreover, terms such as “first” and “second” are used only for distinguishing between different structures or components and are not to be construed as indicating or implying relative importance.

The present application discloses a fan 10. As shown in FIGS. 1 and 2, the fan 10 includes a body 20, a base 30, and a support frame 40 connecting the body 20 to the base 30.

The base 30 of the fan 10 includes an operation panel 35. In this example, the operation panel 35 includes a speed control knob 351 configured to adjust a wind speed of wind blown out of the fan 10, and the speed control knob 351 includes at least one speed gear. The operation panel 35 below the speed control knob 351 includes an energy display key 352, an indicator light 353, and a charging interface 354. In an example, the energy display key 352 may be configured to display the operation capacity of a battery pack connected to the fan 10 or display the charging capacity of a charged electronic device connected to the charging interface 354. When an operator presses the energy display key 352 for different press times or at different frequencies, the indicator light 353 shows the capacities of different devices.

As shown in FIG. 2, the base 30 of the fan 10 includes a first handle 31a and a second handle 31b, which are convenient for the operator to hold when transporting the fun 10. A space between the first handle 31a and the support frame 40 may be configured to hold an article. In an example, when the operator charges another electronic product by use of the charging interface 354, the charged body may be placed in a holder between the first handle 31a or the second handle 31b and the support frame 40.

Hooks 32 are provided in regions where the support frame 40 is connected to the base 30. In this example, the hooks 32 include a first hook 32a on the left side and a second hook 32b on the right side. The hooks 32 are configured with two states, where one state is an extending state for hanging, and the other state is a storage state for being retracted into the innermost part.

The base 30 further includes a battery pack coupling portion 34. When the fan 10 uses the battery pack as an energy source, the battery pack adapted to the fan 10 is mounted to the battery pack coupling portion 34.

A socket for an alternating current power supply is inside a protective cover 33. In the case where the alternating current power supply is not used, the protective cover 33 is in a closed state. When the alternating current power supply needs to be connected, the protective cover 33 is opened, and the socket for the alternating current power supply is connected to an outer electric supply.

As shown in FIG. 3, the body 20 includes a front shield 21, fan blades 22, and a rear shield 23. The front shield 21 is disposed at a front end of the fan blades 22, and the rear shield 23 is disposed at a rear end of the fan blades 22. An airflow flows in through the rear shield 23, passes through the fan blades 22, and flows out through the front shield 21. In this example, an electric motor 24 is disposed in the rear shield 23, and a motor shaft 241 of the electric motor 24 drives the fan blades 22 to rotate. A maximum rotational speed of the electric motor 24 is greater than or equal to 2000 rpm and less than or equal to 2400 rpm. In an example, the maximum rotational speed of the electric motor 24 is 2200 rpm. A minimum rotational speed of the electric motor 24 is greater than or equal to 500 rpm and less than or equal to 700 rpm. In an example, the minimum rotational speed of the electric motor 24 is 600 rpm.

As shown in FIG. 4, the fan blades 22 rotate to form a circular region with a central axis 101 as the center, and the diameter of the circular region is a first diameter D1 which is greater than or equal to 150 mm and less than or equal to 270 mm. In some examples, the first diameter D1 is separately set to 190 mm, 212 mm, 230 mm, and 250 mm. It is to be noted that the central axis 101 refers to an axis of rotation of the fan blades 22. In this example, the central axis 101 basically coincides with a motor axis.

As shown in FIG. 5, the front shield 21 includes front air guide ribs 213 and a shield edge 211, where the front air guide ribs 213 extend from the center of the front shield 21 to the shield edge 211. The front air guide ribs 213 and the shield edge 211 enclose multiple air outlet channels 212. When the fan blades 22 rotate, the airflow flows out through the air outlet channels 212. The air outlet channels 212 diffuse outward from the center of the front shield 21 to form arc-shaped channels. When the air outlet channels 212 diffuse outward from the center of the front shield 21, the width of each air outlet channel 212 gradually increases.

In this example, the diameter of an inner edge 2111 of the shield edge 211 of the front shield 21 of the fan 10 is a second diameter D2 which is greater than or equal to 190 mm and less than or equal to 290 mm. In some examples, the second diameter D2 is separately set to 220 mm, 240 mm, and 260 mm.

The shield edge 211 includes the inner edge 2111 and an outer edge, and the inner edge 2111 is closer to the center of the front shield 21 than the outer edge. An area formed by the inner edge 2111 of the front shield 21 is defined as an effective air outlet area of the front shield 21. In this example, the front shield 21 is basically circular so that the effective air outlet area of the front shield 21 is an area of a circle with the second diameter D2. It is to be noted that when the inner edge 2111 of the front shield 21 is not circular, the effective air outlet area of the front shield 21 needs to be calculated according to an actual shape of the inner edge 2111.

When the electric motor 24 of the fan 10 runs at the maximum rotational speed at which the electric motor 24 is operable, the ratio of a total air volume (m³/min) formed by the fan 10 to the effective air outlet area (m²) of the front shield is greater than or equal to 500 m/min and less than or equal to 2000 m/min. In an example, the ratio of the total air volume to the effective air outlet area is about 1000 m/min. The fan 10 provided in the present application outputs a relatively large air volume in the case of a certain air outlet area of the fan 10.

As shown in FIG. 6, the rear shield 23 of the fan 10 includes air inlet channels 233 and rear air guide ribs 234, where each air inlet channel 233 is formed by an area enclosed by two adjacent rear air guide ribs 234, and the air inlet channels 233 diffuse outward from the center of the rear shield 23 to form linear channels. In an example, an angle between every two adjacent rear air guide ribs 234 is a first angle α between 5° and 7°. In an example, the first angle α is 6°. The top of the rear shield 23 further includes a third handle 231 that can be gripped by the operator.

As shown in FIG. 7, the rear shield 23 includes a side baffle 232. The side baffle 232 may be disposed on the front shield 21 or the rear shield 23. The width of the side baffle 232 is a first width L1 which is greater than or equal to 60 mm and less than or equal to 90 mm. In some examples, the first width L1 is 65 mm, 70 mm, and 75 mm, separately. The first width L1 of the side baffle 232 limits a direction of flow and a volume of the airflow when the airflow flows into the fan blades 22 through the rear shield 23 and restricts the airflow to flowing out through the front shield 21 instead of overflowing from the side of the rear shield 23. It is to be noted that the side baffle 232 may be integrally formed with the rear shield 23, integrally formed with the front shield 21, or separately formed and then mounted to the front shield 21 or the rear shield 23.

A maximum distance of the fan 10 in a front and rear direction is a second width L2 which is greater than or equal to 130 mm and less than or equal to 170 mm. In some examples, the second width L2 is 140 mm, 150 mm, and 160 mm, separately.

The electric motor 24 of the fan 10 has at least a first rotational speed at which the electric motor 24 is operable, and when the electric motor 24 moves at the first rotational speed, a total air volume formed by the fan is greater than or equal to 800 CFM and less than or equal to 1800 CFM.

In this example, the fan 10 includes at least one rotational speed gear adjusted by the speed control knob 351. When the fan 10 has at least two rotational speed gears, the electric motor 24 rotates at different rotational speeds under different rotational speed gears. A maximum rotational speed gear of the fan 10 refers to that the speed control knob 351 adjusts the rotational speed of the electric motor to the maximum rotational speed at which the electric motor is operable. In an example, the fan 10 has only one rotational speed gear, and the electric motor 24 rotates at the first rotational speed constant. In an example, the first rotational speed is the maximum rotational speed at which the electric motor 24 is operable, that is, a rotational speed of the electric motor 24 when the fan 10 is at a high speed gear. In an example, the fan 10 includes at least three rotational speed gears, and the first rotational speed may be a rotational speed of the electric motor 24 when the speed control knob 351 is at an intermediate gear between a low speed gear and a high speed gear. It is to be emphasized that wind speed measurement and a wind speed measurement room must comply with the provisions on dedicated test equipment and a standard laboratory in the National Standard GB/T 13380-2018 of the People's Republic of China, and the test method and determination standards are in accordance with GB/T 13380-2018.

According to the content of the standard GB/T13380, to determine the total air volume, a wind speed needs to be measured, and then the total air volume of the fan is indirectly calculated. A wind speed test device should be set in a laboratory with an ambient temperature not higher than 40° C. or an ambient temperature of use marked on the fan 10 and an ambient humidity not greater than 90%, at an altitude not higher than 1000 m, and without external air and heat radiation. The fan 10 is placed on a plane with a certain height so that the distance between the central axis 101 (see FIG. 3) of the fan blades 22 and the ground is 1200 mm. The distance between a center of the central axis 101 of the fan blades 22 and a front wall surface is 1800 mm, and the distance between the central axis 101 of the fan blades 22 of the fan 10 and each of left and right wall surfaces is 1800 mm.

Before the test, the fan 10 should operate for at least one hour at a rated voltage and a rated frequency. During measurement, the fan 10 should have the front shield 21 and the rear shield 23, the central axis 101 of the fan blades 22 is horizontally positioned, and the electric motor 24 runs at a gear corresponding to the first rotational speed. The central axis 101 of the fan blades 22 of the tested fan 10 is at a height of 1200 mm from the ground. A blade plane of an anemometer is parallel to the fan blades 22 of the fan 10, and the distance between the blade plane of the anemometer and the fan blades 22 of the fan 10 is three times the first diameter of the fan blades 22 of the fan 10.

In the test, the measurement should start from four points on the left, right, upper, and lower sides of the central axis 101 of the fan blades 22 and at a distance of 20 mm from the central axis 101, and the measurement point gradually moves outward at an increment of 40 mm along a horizontal direction and a vertical direction until the measured average wind speed falls below 24 m/min for the first time. The wind speed should be measured for at least 1 min. An indicated value of the anemometer divided by a sampling time of the anemometer at a point is a wind speed (m/min) measured at the point. An average wind speed of any ring should be an average of four wind speed readings at left, right, upper, and lower points on an average radius of the ring. A total output air volume of the fan is a sum of air volumes through all rings ending to a reading limit, which may be calculated by the following formula:

$\begin{array}{cc}\mathrm{Total}\mathrm{air}\mathrm{volume}=\sum Q=\sum V*S=\sum V*2\pi \mathrm{rd}/{10}^6& \left(1\right)\end{array}$

In the above formula, Q is an air volume through a ring, and the unit of Q is m³/min; V is an average wind speed of the ring on the same radius, and the unit of Vis m/min; r is an average radius of the ring, and the unit is mm; d is the width of the ring and equal to 40 mm; and S is the area of the ring, and the unit is m².

The preceding measurement method is in accordance with the test method and the determination standards currently in effect in the People's Republic of China. In some examples, the total air volumes obtained are 25 m³/min (that is, 883 CFM), 31 m³/min (that is, 1100 CFM), 32.8 m³/min (that is, 1158 CFM), 35.4 m³/min (that is, 1250 CFM), and 39.6 m³/min (that is, 1400 CFM), separately.

It is to be noted that the above data may have minor errors due to differences in test site and equipment. In the presence of different test standards of other countries, the fan 10 disclosed in the present application can be measured by these different test standards. However, the parameters disclosed in the present application are all obtained by using the test standards mentioned in the present application as the test method. When it is determined by the preceding test method that the total air volume of the fan 10 is greater than or equal to 800 CFM and less than or equal to 1800 CFM, the electric motor 24 of the fan 10 runs at the first rotational speed. The electric motor 24 of the fan 10 has at least the first rotational speed at which the electric motor 24 is operable, and when the electric motor 24 moves at the first rotational speed, the total air volume formed by the fan 10 is greater than or equal to 800 CFM and less than or equal to 1800 CFM.

When the fan 10 operates at the maximum rotational speed gear, a maximum wind speed of wind blown out from a front surface of the front shield 21 of the fan 10 is greater than or equal to 7.5 m/s and less than or equal to 15 m/s. When the maximum wind speed is measured, an anemometer is placed on the front surface of the front shield 21. A position of the anemometer is adjusted so that a position at which wind output through the front shield 21 has the maximum wind speed is found, and a wind speed value at this time is recorded as the maximum wind speed. The measurement of the maximum wind speed also needs to satisfy environmental conditions similar to the preceding environmental conditions when the total air volume is determined so that the fan 10 is not affected by external air or heat radiation. In some examples, the maximum wind speed reaches 8 m/s, 8.5 m/s, 8.88 m/s, 9.25 m/s, and 9.5 m/s, separately.

A rated voltage of the battery pack adapted to the fan 10 is greater than or equal to 12 V and less than or equal to 80 V. In an example, the rated voltage of the battery pack adapted to the fan 10 is greater than or equal to 18 V and less than or equal to 40 V. In an example, the rated voltage of the battery pack is 20 V or 24 V. It is to be emphasized that the battery pack adapted to the fan 10 is also adaptable to power tools other than the fan 10. Therefore, in addition to the fan 10 or other fans different from the fan 10, the battery pack adapted to the fan 10 may be applied to other types of power tool, such as an electric circular saw, a reciprocating saw, an electric drill, and a sander.

A ratio of a maximum time of endurance of the fan to the capacity of the battery pack is greater than or equal to 8 (h/Ah). the maximum time of endurance of the fan is the lasting time when the fan is working in the minimum speed. When the battery pack adapted to the fan 10 has a capacity of 5 Ah, a maximum time of endurance of the fan is greater than or equal to 40 h. In an example, when the fan 10 operates at the maximum rotational speed, the time of endurance of the fan 10 adapted to the battery pack with a capacity of 5 Ah is 4 h; and when the fan 10 operates at the minimum rotational speed, the time of endurance of the fan 10 adapted to the battery pack with a capacity of 5 Ah is 46 h. That is to say, when the fan 10 operates at the maximum rotational speed gear, electrical energy provided by the battery pack with a capacity of 5 Ah may cause the fan 10 to operate for 4 h; and when the fan 10 operates at a minimum rotational speed gear, the electrical energy provided by the battery pack with a capacity of 5 Ah may cause the fan 10 to operate for 46 h. That is, the battery pack with a capacity of 5 Ah provides the fan 10 with a maximum time of endurance of 46 h.

Claims

1. A fan, comprising: a battery pack coupling portion for mounting a battery pack;fan blades capable of being driven by an electric motor to rotate about a central axis;a front shield at a front end of the fan blades, wherein, when the fan blades rotate, an air flow flows out through the front shield; anda rear shield at a rear end of the fan blades, wherein, when the fan blades rotate, the airflow flows in through the rear shield;wherein the electric motor of the fan has at least a first rotational speed at which the electric motor is operable, and, when the electric motor moves at the first rotational speed, a total air volume formed by the fan is greater than or equal to 800 CFM and less than or equal to 1800 CFM.

2. The fan according to claim 1, wherein a diameter of the fan blades is a first diameter which is greater than or equal to 150 mm and less than or equal to 270 mm.

3. The fan according to claim 1, wherein the first rotational speed is a maximum rotational speed reachable during operation of the fan in a working state.

4. The fan according to claim 1, wherein a rated voltage of the battery pack adapted to the fan is greater than or equal to 18 V and less than or equal to 40 V.

5. The fan according to claim 1, wherein the front shield comprises air outlet channels, the air outlet channels diffuse outward from a center of the front shield, and each of the air outlet channels is arc-shaped.

6. The fan according to claim 1, wherein the rear shield comprises air inlet channels, the air inlet channels diffuse outward from a center of the rear shield, and each of the air inlet channels is linear.

7. The fan according to claim 1, further comprising a side baffle disposed on a side edge of the front shield or the rear shield, wherein a width of the side baffle in a front and rear direction is a first width L1 which is greater than or equal to 60 mm and less than or equal to 90 mm.

8. The fan according to claim 1, wherein a diameter of a shield edge of the front shield of the fan is a second diameter D2 which is greater than or equal to 180 mm and less than or equal to 290 mm.

9. The fan according to claim 1, wherein a maximum distance of the fan in a front and rear direction is a second width L2 which is greater than or equal to 130 mm and less than or equal to 170 mm.

10. The fan according to claim 1, wherein the first rotational speed of the electric motor is greater than or equal to 2000 rpm and less than or equal to 2400 rpm.

11. The fan according to claim 1, wherein the battery pack adapted to the fan is also adaptable to other types of power tools than the fan.

12. The fan according to claim 1, wherein a ratio of a maximum time of endurance of the fan to the capacity of the battery pack is greater than or equal to 8 (h/Ah).

13. The fan according to claim 1, wherein, when the fan operates at the first rotational speed, a maximum wind speed output by the fan is greater than or equal to 7.5 m/s and less than or equal to 15 m/s.

14. A fan, comprising: a battery pack coupling portion configured for mounting a battery pack;fan blades capable of being driven by an electric motor to rotate about a central axis;a front shield at a front end of the fan blades, wherein the front shield comprises front air guide ribs and a shield edge, the front air guide ribs and the shield edge form a plurality of air outlet channels, and, when the fan blades rotate, an airflow flows out through the air outlet channels; anda rear shield at a rear end of the fan blades, wherein, when the fan blades rotate, the airflow flows in through the rear shield;wherein an area formed by an inner edge of the shield edge of the front shield is defined as an effective air outlet area of the front shield, and, when the electric motor of the fan runs at a maximum rotational speed at which the electric motor is operable, a ratio of a total air volume (m3/min) formed by the fan to the effective air outlet area (m2) of the front shield is greater than or equal to 500 m/min and less than or equal to 2000 m/min.

15. The fan according to claim 14, wherein a diameter of the fan blades is a first diameter which is greater than or equal to 150 mm and less than or equal to 270 mm.

16. The fan according to claim 14, wherein a rated voltage of the battery pack adapted to the fan is greater than or equal to 18 V and less than or equal to 40 V.

17. The fan according to claim 14, wherein a ratio of a maximum time of endurance of the fan to the capacity of the battery pack is greater than or equal to 8 (h/Ah).

18. A fan, comprising: a battery pack coupling portion configured for mounting a battery pack;fan blades capable of being driven by an electric motor to rotate about a central axis;a front shield at a front end of the fan blades, wherein, when the fan blades rotate, an airflow flows out through the front shield; anda rear shield at a rear end of the fan blades, wherein, when the fan blades rotate, the airflow flows in through the rear shield;wherein a rated voltage of the battery pack adapted to the fan is greater than or equal to 12 V and less than or equal to 80 V, the electric motor of the fan has at least a first rotational speed at which the electric motor is operable, and, when the electric motor moves at the first rotational speed, a total air volume formed by the fan is greater than or equal to 800 CFM.

19. The fan according to claim 18, wherein a diameter of the fan blades is a first diameter which is greater than or equal to 150 mm and less than or equal to 270 mm.

20. The fan according to claim 18, wherein a ratio of a maximum time of endurance of the fan to the capacity of the battery pack is greater than or equal to 8 (h/Ah).