CN211006484U - Blower and blowing and sucking machine - Google Patents

Abstract

The utility model provides a hair-dryer and suction machine, include: the casing, a handle central axis and the handle of the point of holding have been defined on length direction, connect the motor in the casing, the fan of rotatory and production air current by motor drive, be connected to the tuber pipe on the casing, can join in marriage the battery pack on the casing, hair-dryer and suction machine receive the reaction force of gravity and during operation, the ratio between reaction force and the gravity is the benchmark value, the line of action of gravity is first interval to the distance of the point of holding, the line of action of reaction force is the second interval to the distance of the point of holding, the line of action of gravity is through the focus of hair-dryer and the benchmark value that the ratio between first interval and the second interval is 0.8 ~ 1.2 times.

Description

Blower and blowing and sucking machine

Technical Field

The utility model relates to a hair-dryer and suction machine especially relate to a focus position configuration is for doing benefit to hair-dryer and suction machine of operation.

Background

The existing blower or blowing-sucking machine sucks or blows out air by driving a fan to rotate through a motor so as to clean dead leaves and other impurities. The wireless blowing and sucking machine or the wireless blower is not limited by a power supply cable, so that a wider space can be managed compared with an alternating current power supply machine. However, the cordless blower or hair dryer requires a battery with a certain capacity to provide power, and generally, the battery pack for the electric tool has a certain weight and volume, and the battery pack is not easy to operate and the working efficiency is affected if the battery pack is not installed. In addition, most of the existing blowing and sucking machines are provided with a volute and a structure for replacing a blowing pipe and a sucking pipe, and the blowing and sucking machines are different in holding modes under different blowing and sucking modes, so that the gravity center needs to meet the requirements of different modes.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned defect among the prior art, the utility model provides a hair-dryer, its battery package configuration mode make hair-dryer complete machine focus compact structure when the right side skew left, the volume is less.

A first aspect of the present invention provides a hair dryer, comprising: a housing; a handle, said handle defining a handle central axis in a length direction; a motor connected to the housing; a fan driven to rotate by the motor and generating an air flow; an air duct connectable to the housing; a battery assembly capable of being coupled to the housing and providing power to the blower; the battery pack comprises a first battery pack and a second battery pack, the first battery pack and the second battery pack are configured to enable the center of gravity of the blower to be located on a reference plane formed by the central axis of the handle and the central axis of the air duct, a connecting line between the center of gravity of the motor and a projection of the center of gravity of the first battery pack forms a first base line on a plane passing through the center of gravity of the motor and perpendicular to the reference plane, a connecting line between the center of gravity of the motor and a projection of the center of gravity of the second battery pack forms a second base line, and an included angle between the first base line and the second base line is smaller than 50 degrees.

In one embodiment, when the battery assembly is coupled to the housing, a distance between a center of gravity of the first battery pack and a center of gravity of the motor is equal to a distance between a center of gravity of the second battery pack and a center of gravity of the motor.

In one embodiment, the centers of gravity of the first and second battery packs are equidistant from the reference plane.

In one embodiment, a line connecting the center of gravity of the first battery pack and the center of gravity of the second battery pack is perpendicular to the reference plane.

In one embodiment, the housing includes a battery pack mounting portion connected to the first battery pack and the second battery pack, a motor housing for accommodating the motor, and a volute for accommodating the fan and guiding airflow, the motor housing is disposed between the handle and the volute, the motor housing includes a front end close to the air duct and a rear end opposite to the front end, and the battery pack mounting portion is disposed close to the rear end.

In one embodiment, the first battery pack and the second battery pack include mating surfaces that mate with the battery pack mounting portion, the first battery pack and the second battery pack are detachably combined to the outside of the case, and the mating surfaces are located on the left and right sides of the reference surface.

In one embodiment, the mating surface is parallel to the reference surface, and the first battery pack and the second battery pack are both mated to the housing in a blowing direction of the blower.

In one embodiment, the included angle between the first baseline and the second baseline is less than or equal to 42 degrees.

Another aspect of the present invention is to provide a blowing and sucking machine, which has a blowing mode and a sucking mode, including: a housing; a handle, said handle defining a handle central axis in a length direction; a motor connected to the housing; a fan driven by the motor to rotate to generate air flow; the blow-suction assembly can be connected to the shell and comprises a blow pipe and a suction pipe, the blow pipe is connected with the shell in a blow molding mode, and the suction pipe is connected with the shell in a suction mode; a battery assembly capable of being coupled to the housing and supplying power to the suction blower; the battery assembly comprises a first battery pack and a second battery pack; in the suction mode, the first battery pack and the second battery pack are configured to enable the gravity center of the blowing and sucking machine to be located on a section of the handle, on a plane passing through the gravity center of the motor and perpendicular to the section of the handle, a connecting line between the gravity center of the motor and a projection of the gravity center of the first battery pack forms a first base line, a connecting line between the gravity center of the motor and a projection of the gravity center of the second battery pack forms a second base line, and an included angle between the first base line and the second base line is smaller than 50 degrees.

In one embodiment, the suction blower comprises an auxiliary handle for holding in suction mode, the first battery pack and the second battery pack being arranged between the handle and the auxiliary handle in the extension direction of the suction tube.

In one embodiment, the housing includes a volute on which the auxiliary handle is removably disposed.

This neotype hair-dryer or suction machine, complete machine focus is configured to be located and is favorable to the plane of operation, can effectively reduce the fatigue that the operator used for a long time. And the first battery pack and the second battery pack are more compact in structure on two sides of the reference surface, more concentrated in gravity center and not prone to inclining towards any side of the reference surface, and the battery packs on the left side and the right side of the machine are less in protruding parts and small in size and easy to store.

Drawings

The same reference numbers and symbols in the drawings and the description are used to indicate the same or equivalent elements.

Figure 1 is a schematic view of a datum for a blower according to a first embodiment.

Figure 2 is a top view of a first embodiment blower.

Figure 3 is a side view of a first embodiment blower.

Figure 4 is a schematic view of the relationship of the centers of gravity of the hair dryer of the first embodiment.

Figure 5 is a side cross-sectional view of the first embodiment blower.

FIG. 6 is a torque diagram of the first embodiment

Fig. 7 is a schematic view of the second embodiment of the suction blower with a blow pipe installed.

Figure 8 is a schematic view of a second embodiment of a suction blower with the suction tube replaced.

Fig. 9 is a schematic view of a section of a handle of the blow-and-suck machine of the second embodiment.

Fig. 10 is a schematic view of the relationship of the gravity centers of the blowing and sucking machine of the second embodiment.

FIG. 11 is a schematic view showing the relationship between the moments when the suction machine of the second embodiment performs the suction operation.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.

Example 1

Fig. 1 to 5 show a hair dryer 100 according to an embodiment of the present invention. Blower 100 includes housing 120, handle 102, motor 301, fan 302, air duct 103, and battery assembly 110. The motor and fan are disposed inside the housing 120, the battery assembly 110 is coupled to the housing 120 to provide power to the hair dryer 100, the air duct 103 is coupled to the front end of the housing 120 to guide the air to be blown out, the handle 102 is disposed at the upper end of the housing 120, and the handle 102 can be disposed integrally with or separately from the housing 120, in this embodiment, the handle 102 is disposed integrally with the housing. A switch assembly 1021 is provided on the handle 102. When an operator holds the handle 102 and operates the switch assembly 1021 to start the blower 100, the fan is driven by the motor to rotate to generate an air flow, the air flow enters the air duct 103 from the casing 120 and is blown out under the guidance of the air duct, and the operator can adjust the air outlet direction of the air duct by adjusting the handle 102 to blow and clean impurities such as fallen leaves on the ground.

Specifically, the handle 102 defines a handle central axis 104 in the longitudinal direction, i.e., from the rear to the front, and the air duct 103 defines an air duct central axis 105 in the longitudinal direction, i.e., from the rear to the front, which is a line passing through the air duct dividing the air duct into symmetrical sections about which the air duct is rotatable. It should be noted that symmetry is understood to mean substantial symmetry, and the differences in the fine structure of the left and right sides of the duct are within the scope of the present disclosure.

The handle central axis 104 and the duct central axis 105 form a datum plane 106. The air duct 103 includes a mating end 1032 mated with the housing 120, and an air outlet end 1031 disposed at the other end of the air duct opposite to the mating end 1032, and a direction from the mating end 1032 to the air outlet end 1031 is an air duct extending direction, in this embodiment, the air duct extending direction is substantially the same as a direction from the rear side to the front side. The battery pack 110 includes a first battery pack 111 and a second battery pack 112, the first battery pack 111 and the second battery pack 112 are coupled to the housing 120 along the extending direction of the air duct, and the first battery pack 111 and the second battery pack 112 are arranged such that the center of gravity of the blower 100 is located on a reference plane 106 formed by the handle central axis 104 and the central axis 105. With the above arrangement of the center of gravity, when the operator grips the blower and operates it, the center of gravity is flush with the palm of the operator's hand, and no moment acts on the operator's hand, in other words, the blower does not deflect to the left or right in the drawing when the operator operates it.

As shown in fig. 2-3, the center of gravity of the motor of the blower 100 is G1, the center of gravity of the first battery pack is G2, the center of gravity of the second battery pack is G3, and the distance between the center of gravity G1 of the blower 100 and the center of gravity G2 of the first battery pack is equal to the distance between the center of gravity G1 of the blower 100 and the center of gravity G3 of the second battery pack. Further, the center of gravity G2 of the first battery pack 111 and the center of gravity G3 of the second battery pack 112 are symmetrical with respect to the reference plane 106, in other words, the center of gravity G2 of the first battery pack 111 and the center of gravity G3 of the second battery pack 112 correspond one-to-one, and a line connecting G2 and G3 is bisected perpendicularly by the reference plane 106, that is, G2 and G3 are plane-symmetrical with respect to the reference plane 106, and the reference plane 106 may be referred to as a plane of symmetry of G2 and G3.

As shown in fig. 4, a connection line between a projection of the center of gravity G1 of the motor on the upper end surface 1221 and a projection of the center of gravity G2 of the first battery pack 111 on the upper end surface 1221 is D1, a connection line between a projection of the center of gravity G1 of the motor on the upper end surface 1221 and a projection of the center of gravity G3 of the second battery pack 112 on the upper end surface 1221 is D2, an angle α is formed between D639 and D2, an angle α between D1 and D2 is determined by a positional relationship between the first battery pack 111 and the second battery pack 112 and a motor, since the center of gravity G2 of the first battery pack 111 and the center of gravity G867 of the second battery pack 112 are symmetrically disposed with respect to the reference plane 106, when a distance between the first battery pack 111 and the second battery pack 112 is closer to the motor along a direction of extension of the air duct, and when a distance between the first battery pack 111 and the second battery pack 112 is closer to the motor, or between the center of the battery pack 111 and the motor 72 is smaller than a distance between the right side of the battery pack, or between the battery pack 72, or between the motor case α, or between the right side of the motor case α, or between the battery pack and the motor case α, or between the motor case may be smaller than the motor case α, or between the motor case.

As shown in fig. 1 to 3, the housing 120 includes a scroll casing 122, the scroll casing 122 includes an upper end surface 1221, and the upper end surface 1221 is disposed opposite to the handle 102 and perpendicular to the reference surface 106. The battery assembly 110 is disposed between the volute 120 and the handle 102, and specifically, the battery assembly 110 is disposed between the handle central axis 104 and the upper end face 1221. The handle 102 has a length projection a1 along the handle central axis 104 on the upper end surface 1221, the first battery pack 111 and the second battery pack 112 have a length projection a2 along the handle central axis 104 on the upper end surface 1121, and at least one-half of the projections a1 and a2 coincide. With the above arrangement, the center of gravity of the blower 100 can be brought close to the handle 102, thereby reducing the force required to rotate the blower from the left side to the right side. As shown in fig. 5, the blower 100 includes a motor 301 disposed inside a motor housing, and a fan 302 disposed inside the volute 122, wherein the motor 301 drives the fan 302 to rotate, and the airflow is guided by the volute 122 and then blown out by the blow pipe. The scroll casing 122, the motor housing 121, and the handle 102 are sequentially arranged in a direction from a lower side to an upper side as shown in fig. 5, the motor housing 121 includes a front end 1211 adjacent to the duct 103, and a rear end 1212 opposite to the front end 1211, the battery pack mounting portion 130 is arranged adjacent to the rear end 1212, the battery pack mounting portion 130 is used to mount a first battery pack and a second battery pack, and a gravity center G1 of the battery 301 and a gravity center G2 of the first battery pack (a gravity center G3 of the second battery pack coincides with a gravity center G2) are located as shown in fig. 5.

As shown in fig. 2, the first battery pack 111 and the second battery pack 112 include mating surfaces that mate with the housing 120, and the mating surfaces are configured to electrically connect and mate with a blower. The first battery pack 111 is provided with a mating surface 113, and the second battery pack 112 is provided with a mating surface 114. The first and second battery packs 111 and 112 are coupled to the hair dryer in a blowing direction, i.e., from the rear side to the front side, so that when the battery packs are coupled, an operator can hold the air duct of the hair dryer against the ground, hold the hair dryer with one hand to stabilize the hair dryer, and then couple the battery packs to the hair dryer from the rear side to the front side with the other hand, which is simple and fast to operate.

As shown in fig. 2 or 4, the first battery pack 111 and the second battery pack 112 may be detachably combined to the outside of the housing, and in particular, mating surfaces are located on both right and left sides of the reference surface 106. When the first battery pack 111 and the second battery pack 112 are coupled to the hair dryer 100, the coupling surfaces 113 and 114 are parallel to the reference surface 106. Therefore, the space occupied by the first battery pack 111 and the second battery pack 112 after being connected to the blower 100 in a matching mode is reduced, the distance between the gravity center G2 of the first battery pack and the gravity center G3 of the second battery pack is reduced, the included angle between the D1 and the D2 is kept within 50 degrees, and the whole structure is compact.

As shown in FIG. 8, when the blower 100 is operated, the central axis 108 of the blowing tube forms an angle β with the ground, the angle β is at a suitable angle to enable a user to comfortably grip the blower and to enable the blown air to directly act on the debris such as leaves on the ground, the angle β is equal to or less than 30 degrees, preferably 20 degrees, 25 degrees, or 30 degrees, when the blower 100 is held at the grip point H of the handle 102, the grip point H is a preferred grip position, the user can touch the operating button with his fingers when gripping the blower in the blow-molding mode, and the palm center is approximately at the grip point H, it is ensured that the operator can touch the operating button to operate the blower and is advantageous to grip the blower to move the blower in various orientations, the blower 100 is subjected to a vertically downward gravitational force G, and when operating, the blowing force F generated by the blowing air in the direction opposite to the air flow direction along the central axis, and when the blowing force F generated by the blowing air flow in the blowing direction is substantially equal to the rotational force F, the rotational torque generated by the blowing force F generated in the blowing direction M and the rotational torque generated by the rotational direction of the blowing tube M, the blowing motor 100, the rotational torque generated when the blowing force generated in the blowing motor 100 is operated in the blowing direction (M) and the rotational torque generated by the rotational torque generated.

As shown in fig. 7, when the blower 100 is held in the palm of the hand of the operator during a blowing operation, the blower 100 tends to rotate around a holding point H under the influence of gravity G and reaction force F, and therefore, the holding point H is the rotation axis of the above two forces, and as can be seen from the force analysis of fig. 7, the arm L1 of gravity G is the distance between the line of action of gravity G and the rotation axis, i.e., the holding point, and the arm L2 of reaction force F is the distance between the line of action of reaction force F and the rotation axis, i.e., the holding point, and therefore, the gravity moment m (G) ═ G1 × L1, and the reaction moment m (F) ═ F L2.

In order to achieve a blowing mode in which the blower 100 can be used smoothly, the two moments are balanced, i.e., m (G) ═ m (F), and thus G1 × L ═ F L, since the blower performance parameters are related to the bare weight, the handle position is substantially fixed, and therefore the weight specification of the battery pack is closely related to the handle, so that the user can hold the blower 100 stably in the blow-molded mode, and the distance L between the center of gravity of the complete machine and the holding point should be as equal as possible to F L/G, so that the ratio between the arm L of gravity G and the arm L2 of reaction force F is 0.8 to 1.2F L/G, and specifically, the ratio may be 0.8F L/G, 0.639F 25/G, L F362/362, and L F24/3, in order to avoid the deflection due to the gravity moment m (G) and the reaction force m (F).

Example 2

Fig. 7 to 10 show a blowing and sucking machine 200 according to another embodiment of the present invention. As shown in fig. 7, the blow-and-suck machine 200 includes a housing 220, a handle 202, a motor (not shown), a fan (not shown), a blow pipe 203, and a battery assembly 210. The connection, position and function of the above components are similar to those of the blower 100 in embodiment 1, and the blow-molded lower air inlet and outlet are also similar to those of the blower 100 in embodiment 1 and will not be described again.

As shown in fig. 8 to 9, unlike embodiment 1, the blow-suction machine 200 further includes a suction pipe 207, and the blow pipe 203 and the suction pipe 207 together constitute a blow-suction assembly of the blow-suction machine 200. When the blowing and sucking machine needs to suck sundries such as leaves, the blowing pipe 203 needs to be detached, the suction pipe 207 needs to be replaced, and the suction pipe 207 comprises the suction inlet 208. After the suction pipe 207 is replaced, the machine is started, the suction port 208 of the suction pipe 207 is aligned with sundries such as leaves, the sundries are sucked into the shell from the suction pipe 207, the shell 220 further comprises an outlet 209 used for connecting a garbage bag, and the sundries such as leaves are crushed in the shell and then collected into the garbage bag through the outlet 209. In the suction mode, the first battery pack 211 and the second battery pack 212 are configured such that the center of gravity of the vacuum blower 200 is located on the section 206 of the handle 202. With the above arrangement of the center of gravity, when the operator grips the blower and operates it, the center of gravity is flush with the palm of the operator's hand, and no moment acts on the operator's hand, in other words, the blower does not deflect to the left or right in the drawing when the operator operates it.

As shown in fig. 10, the connection line between the projection of the center of gravity G1 of the motor on the upper end 2221 and the projection of the center of gravity G2 of the first battery pack 211 on the upper end 2221 is D1 ', the projection of the center of gravity G1 ' of the motor on the upper end 2221 and the projection of the center of gravity G3 ' of the second battery pack 212 on the upper end 2221 is D2 ', D1 ' and D2 ' form an angle α ', α ' between D1 ' and D2 ', depending on the positional relationship between the first and second battery packs 211, 212 and the motor, and since the center of gravity G2 ' of the first battery pack 211 and the center of gravity G3 ' of the second battery pack 212 ' are symmetrically disposed about the handle section 206, the angle between the center of gravity G211 ' of the first battery pack and the center of gravity G212 ' of the second battery pack 212 is preferably smaller relative to the center axis of the battery pack 212, i.e. when the first battery pack 211 and second battery pack 212 are disposed closer to the handle section 206, and the handle section is disposed between the handle section, and the handle section is preferably disposed between the handle section, when the handle section is disposed between the battery pack 211 and the handle section, the handle section is disposed between the handle section, the handle section is disposed between the handle section, and the handle section, the handle section is disposed between the handle section, and the handle section is preferably disposed between the handle section, the handle section is disposed between the handle section, and the handle section is disposed, the handle section is disposed between the handle section, and the handle section is disposed between the handle section, and the handle section, the handle section is disposed between the handle section is disposed, the handle section is disposed between the handle section, the handle section is disposed between the handle section is disposed.

As shown in FIG. 8, since the suction/blowing machine 200 performs the switching between the suction/blowing mode and the suction mode by changing the tube, the suction tube 207 is installed on the housing 220 at a position opposite to the handle 205, and it is difficult to align the nozzle of the suction tube 208 with the ground by holding the handle 205 with one hand, so that the suction/blowing machine 200 is provided with the auxiliary handle 205 ', so that when the suction operation is performed, the machine is kept stable by holding the handle 205 with one hand, and the angle and distance between the nozzle of the suction tube 207 and the ground are adjusted by holding the auxiliary handle 205' with the other hand, thereby facilitating the operation in the suction mode. In one embodiment, the auxiliary handle 205 'is removably disposed on the volute 222, and in particular, the auxiliary handle 205' is disposed at an end of the volute 222 opposite to an end thereof to which the blow pipe 203 is coupled. To reduce the weight and volume of the blow-and-suck machine 200 during the blowing operation, the auxiliary handle 205 ' is detachably connected to the volute 222, and in one embodiment, the auxiliary handle 205 ' is integrally formed with the suction pipe 207, so that the auxiliary handle 205 ' can be detached while the suction pipe 207 is detached.

To facilitate the user's operation of the machine with a center of gravity set during a suctioning operation, a first battery pack 211 and a second battery pack 212 are disposed between the auxiliary handle 205' and the handle 205 on the suction pipe center axis 208. By the arrangement of the battery pack, the center of gravity of the blowing and sucking machine 200 during the sucking operation can be kept between the auxiliary handle 205' and the auxiliary handle 205, so that the stability of the blowing and sucking machine 200 during the sucking operation is kept, and the force required by the blowing and sucking machine during the movement on the plane vertical to the reference plane 206 is reduced. Other gravity center configurations of the first battery pack 211 and the second battery pack 212 are the same as those of the first embodiment, and are not described herein again.

As shown in fig. 11, when the suction blower 200 performs a suction operation, the central axis 208 of the suction pipe forms an included angle γ with the ground, and the included angle γ is at a proper angle to enable a user to comfortably hold the blower and to enable the nozzle of the suction pipe to be aligned with the sundries such as leaves as much as possible. The included angle γ is greater than 40 degrees, preferably in the range of 40 degrees to 70 degrees, and specifically, the included angle γ may be 45 degrees, 50 degrees, 55 degrees, 60 degrees, 65 degrees. Like the blower 100 of embodiment 1, the suction blower 200 is also subjected to the vertical downward gravity, and the reaction force F of the blowing force generated by the blown air flow in the opposite direction to the air flow along the central axis of the air duct when operating, when the suction blower 200 operates in the blow molding mode, under the action of the reaction force F, the reaction force moment m (F) is generated as shown in the figure, so that the blower 100 generates the clockwise rotation movement trend in the plane where the central axis of the air duct and the axis of the motor are located approximately, and simultaneously, under the action of the gravity G, the gravity moment m (G) in the opposite direction to the reaction force moment m (F) is generated, the gravity moment m (G) generates the counterclockwise rotation movement trend in the plane where the central axis of the air duct and the axis of the motor are located approximately, and the two moments need to reach a certain balance to avoid generating the deflection moment, the need for the operator to exert additional force to stabilize the machine is avoided, so that the blow-and-suction machine 200 can be held stably by the operator while performing the suction operation.

The blower 200 has a grip point H at the handle 202, which is a preferred grip position, where the user can touch the operating buttons when holding the blower in the blow-molding mode, and the palm center is located approximately at the grip point H, which ensures that the operator can both touch the control buttons to operate the machine and facilitate holding the machine to move the machine in various orientations, hi order to achieve a smooth use of the blower 200 in the blow-molding mode, the two moments are balanced, i.e., m (G) ═ m (F), and the force analysis is shown in fig. 11, so G1F 28F L, the weight specification of the battery pack is closely related to the handle, and the ratio between the gravity force m (G) and the reaction force moment m (F) is calculated as a ratio F3/G5, G24G 5, G3G 2G 3G 38F L G3.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (12)

1. A hair dryer, comprising:

a housing;

a handle defining a handle central axis and a gripping point in a length direction;

a motor connected to the housing;

a fan driven to rotate by the motor and generating an air flow;

an air duct connectable to the housing;

a battery assembly capable of being coupled to the housing and providing power to the blower;

the hair drier is subjected to gravity and reaction force during working, the ratio of the reaction force to the gravity is a reference value, the distance from the action line of the gravity to the holding point is a first distance, and the distance from the action line of the reaction force to the holding point is a second distance;

the hair dryer is characterized in that the action line of the gravity passes through the center of gravity of the hair dryer, the ratio of the first distance to the second distance is a reference value which is 0.8-1.2 times, the battery assembly comprises a first battery pack and a second battery pack, the first battery pack and the second battery pack are configured to enable the center of gravity of the hair dryer to be located on a reference plane formed by the central axis of the handle and the central axis of the air duct, a connecting line of the center of gravity of the motor and the center of gravity of the first battery pack forms a first base line, a connecting line of the center of gravity of the motor and the center of gravity of the second battery pack forms a second base line, and an included angle between the first base line and the second base line is smaller than 50 degrees.

2. The hair dryer of claim 1, wherein an included angle between a central axis of said air duct and a ground surface is less than or equal to 30 degrees in an operating state of said hair dryer.

3. The hair dryer of claim 1, wherein an included angle between the first baseline and the second baseline is less than or equal to 42 degrees.

4. The hair dryer of claim 1, wherein a distance between a center of gravity of said first battery pack and a center of gravity of said motor is equal to a distance between a center of gravity of said second battery pack and a center of gravity of said motor when said battery assembly is coupled to said housing.

5. The hair dryer of claim 1, wherein the centers of gravity of the first and second battery packs are equidistant from the reference plane, and wherein a line connecting the center of gravity of the first battery pack and the center of gravity of the second battery pack is perpendicular to the reference plane.

6. The hair dryer of claim 1, wherein said housing includes a battery pack mounting portion connected to correspond to said first and second battery packs, a motor housing receiving said motor, said motor housing including a front end adjacent said air duct and a rear end disposed opposite said front end, said battery pack mounting portion disposed adjacent said rear end.

7. The hair dryer of claim 6, wherein said first battery pack and said second battery pack each include a mating surface that mates with said battery pack mounting portion, said first battery pack and said second battery pack being detachably combined on an outer side of said housing, said mating surfaces being located on left and right sides of said reference surface, respectively.

8. The hair dryer of claim 7, wherein said mating surface is parallel to said reference surface, and wherein said first battery pack and said second battery pack are both mated to said housing in a direction of blowing of said hair dryer.

9. The hair dryer of claim 1, wherein said handle coincides with at least one-half of a projection of a length of said first battery pack or said second battery pack on a plane perpendicular to said reference plane.

10. A blow and suction machine having a blow mode and a suction mode, comprising:

the air conditioner comprises a shell, wherein an air inlet is formed in the shell, and air enters from the air inlet;

a handle defining a handle central axis and a gripping point in a length direction;

a motor connected to the housing;

a fan driven by the motor to rotate to generate air flow;

the blow-suction assembly can be connected to the shell, the blow-suction assembly comprises a blow pipe and a suction pipe, in a blow molding mode, the blow pipe is connected with the shell, the air flow enters from the air inlet and is blown out from the blow pipe, in a suction mode, the suction pipe is connected with the shell, and the air flow is sucked from the suction pipe;

a battery assembly capable of being coupled to the housing and supplying power to the suction blower;

the blowing and sucking machine is subjected to gravity and reaction force during working, the ratio of the reaction force to the gravity is a reference value, the distance from the action line of the gravity to the holding point is a first distance, and the distance from the action line of the reaction force to the holding point is a second distance;

the battery pack is characterized in that the action line of the gravity passes through the gravity center of the blowing and sucking machine, the ratio of the first distance to the second distance is a reference value which is 0.8-1.2 times, and the battery pack comprises a first battery pack and a second battery pack;

in the suction mode, the first battery pack and the second battery pack are configured to enable the gravity center of the blowing and sucking machine to be located on a midsplit section of the handle, a connecting line between the gravity center of the motor and a projection of the gravity center of the first battery pack on a plane perpendicular to the midsplit section forms a first base line, a connecting line between the gravity center of the motor and a projection of the gravity center of the second battery pack on a plane perpendicular to the midsplit section forms a second base line, and an included angle between the first base line and the second base line is smaller than 50 degrees.

11. The suction blower of claim 10, wherein an included angle between the central axis of the suction pipe and the ground in the suction state of the suction blower is greater than or equal to 40 degrees.

12. The suction blower of claim 10, comprising an auxiliary handle for holding in a suction mode, the first battery pack and the second battery pack being disposed between the handle and the auxiliary handle in a direction of extension of the suction tube.

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