CN212318334U - Blower fan - Google Patents

Abstract

The utility model provides an air blower, the utility model discloses can reduce the noise of air-blower. The blower has: a scroll casing in which a suction port, a scroll chamber, and a discharge port are partitioned; an impeller rotatably supported in the volute; a motor connected to the impeller and driving the impeller; a housing that houses the volute and the motor; and a sound absorbing member located between the scroll casing and the housing and on an extension of a rotation axis of the motor.

Description

Blower fan

Technical Field

The present disclosure relates to a blower that is a kind of work machine.

Background

A blower as a kind of work machine is known. The blower is held or attached in a predetermined posture by a user, and blows air to collect scattered objects such as fallen leaves and cut grass. As such a blower, a hand-held blower and a backpack blower are widely used.

Patent document 1 discloses a backpack blower. The blower includes a volute, an impeller rotatably supported in a volute chamber of the volute, a motor connected to the impeller and driving the impeller, and a casing accommodating the volute and the motor.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2016 and No. 204930

SUMMERY OF THE UTILITY MODEL

Problem to be solved by utility model

In the blower described above, since the motor is disposed in the casing, it is possible to suppress the noise of the motor from being radiated to the surroundings. The present specification provides a technique for further improving a motor to further suppress the noise of the motor from being radiated to the surroundings.

Means for solving the problems

The techniques disclosed herein are embodied as a blower (e.g., a hand-held blower or a backpack blower) held or carried by a user. The blower has: a scroll casing in which a suction port, a scroll chamber, and a discharge port are partitioned; an impeller rotatably supported in the volute; a motor connected to the impeller and driving the impeller; a housing that houses the volute and the motor; and a sound absorbing member located between the scroll casing and the housing and on an extension of a rotation axis of the motor.

In the blower described above, the sound absorbing member is disposed on an extension of the rotation shaft of the motor. According to this structure, the noise of the motor is absorbed not only by the sound absorbing member but also by the housing. This can effectively suppress the noise of the motor from being radiated to the surroundings.

The sound absorbing member may be located on an extension of a rotation shaft of the impeller.

The sound absorbing member may be opposed to the suction port of the scroll casing.

The sound absorbing member may be attached to an inner surface of the casing.

The sound absorbing member may be made of sponge.

The sound absorbing member may include a 1 st sound absorbing member and a 2 nd sound absorbing member facing each other with the motor interposed therebetween.

The blower may further include a cylindrical 3 rd sound absorbing member surrounding the motor in a radial direction perpendicular to a rotation axis of the motor.

The scroll casing may have a discharge duct protruding outward of the casing, the casing may have a duct opening through which the discharge duct passes, and the blower may further have a 4 th sound absorbing member provided in a gap between the duct opening and the discharge duct.

The casing may support the scroll casing by at least one vibration preventing member.

The blower may be a backpack blower that is attached to the back of the user.

Drawings

Fig. 1 is a perspective view showing an external appearance of a blower 10 according to an embodiment.

Fig. 2 is an exploded perspective view of the blower 10.

Fig. 3 is a sectional view showing the internal structure of the blower 10. The arrows F in the figure schematically indicate the flow of air in the air path 42.

Fig. 4 is a diagram showing an internal structure of the blower 10 with a part of the casing 14 removed. Arrows F in the figure schematically indicate the flow of air in the air paths 42, 42a, 42 b.

Figure 5 is a cross-sectional view of a volute.

Figure 6 is an exploded perspective view of the volute.

Fig. 7 is a partially exploded perspective view of blower 10, and shows sound absorbing members 62, 64, 66, and 68.

Description of the reference numerals

2. A battery pack; 10. a blower; 12. a volute pump; 13. a vibration-proof member; 14. a housing; 14a, a base member; 14b, a cover member; 14c, a pipe opening; 14d, bottom; 16. shoulder straps; 18. a battery interface; 18a, a battery terminal; 20. a discharge nozzle; 22. an operating handle; 24. a trigger member; 26. a volute; 26a, a suction inlet; 26b, volute; 26c, a discharge port; 26d, a discharge conduit; 28. an impeller; 30. a motor; 32. a motor controller; 34. a unit holder; 40a, 40b, an external suction port; 42. 42a, 42b, air path; 44. a ground plane; 52. a housing main body; 54. a bell mouth; 56. the 1 st component of the volute; 58. the 2 nd component of the volute; 62. 64, 66, 68, sound absorbing member.

Detailed Description

In one embodiment of the present technology, the sound absorbing member is also located on an extension of the rotation shaft of the impeller. With this configuration, the noise of the impeller can be effectively absorbed.

In one embodiment of the present technology, the sound absorbing member may face the suction port of the scroll casing. According to such a configuration, wind noise of air generated from the scroll can be effectively absorbed.

In one embodiment of the present technology, the sound absorbing member may be attached to an inner surface of the casing. With this configuration, the sound absorbing member can be easily arranged at an appropriate position when the blower is manufactured.

In one embodiment of the present technology, the sound absorbing member may be made of sponge. The sponge as referred to herein is a sponge-like (or porous) material in a wide range, and the material constituting the sponge is not particularly limited. The sound absorbing member can be made of a variety of materials such as a resin material and a rubber material.

In one embodiment of the present technology, the sound absorbing member may include a 1 st sound absorbing member and a 2 nd sound absorbing member that face each other with the motor interposed therebetween. According to the structure, the noise of the motor can be effectively absorbed.

In one embodiment of the present technology, the blower may further include a cylindrical 3 rd sound absorbing member surrounding the motor in a radial direction perpendicular to a rotation axis of the motor. With this configuration, the noise of the motor can be further absorbed.

In an embodiment of the present technology, the volute may have a discharge duct protruding to an outside of the casing. In this case, the housing may have a duct opening through which the discharge duct passes. Also, the blower may further have a 4 th sound-absorbing member provided in a gap between the duct opening and the discharge duct. According to such a configuration, the leakage of the noise of the motor from the duct opening can be effectively suppressed.

In the above embodiment, by providing the 4 th sound absorbing member, a large gap can be provided between the duct opening and the discharge duct. Thereby, the casing can also support the scroll casing by means of the at least one vibration preventing member. With this configuration, transmission of vibration of the scroll casing and the motor to the user can be suppressed.

In one embodiment of the present technology, the blower may be a backpack blower that is attached to the back of the user. Alternatively, as another embodiment, the blower may be a hand-held blower that has a handle for the user to hold and that is held in a predetermined posture by the user.

Representative, non-limiting examples of the present invention are described in detail below with reference to the accompanying drawings. The detailed description is merely intended to show those skilled in the art the details of preferred examples for carrying out the invention and is not intended to limit the scope of the invention. In addition, in order to provide a further improved blower, additional features and aspects disclosed below can be used separately or together with other features and aspects.

In addition, combinations of features and steps disclosed in the following detailed description are not essential to practice of the present invention in the broadest sense, and are described only for the purpose of describing particular representative examples of the present invention. In addition, in providing additional and useful embodiments of the present invention, it is not necessary that the various features of the above and below described representative examples, as well as the various features of the independent and dependent claims, be combined in the order of description or enumeration with the examples described herein.

All features described in this specification and/or claims, which differ in structure from the features described in the examples and/or claims, are intended to be disclosed separately and independently of each other as a definition of the limits of the application at the outset and as required for the particular circumstances. Further, the description of all the numerical ranges and groups or groups is intended to be completed by disclosing intermediate structures between the first disclosure of the application and the specific matters required.

[ examples ] A method for producing a compound

Referring to the drawings, a blower 10 of an embodiment is illustrated. The blower 10 of the present embodiment is a negative-back type blower, and is one type of work machine mainly used outdoors. The blower 10 is attached to the back of a user in a predetermined posture, and blows air to collect scattered objects such as fallen leaves and grass. The blower 10 is a working machine using the battery packs 2 as a power source, and the two battery packs 2 are configured to be detachable from the blower 10. The number of the battery packs 2 is not limited to two.

As shown in fig. 1 to 4, the blower 10 includes a volute pump 12, a housing 14 that houses the volute pump 12, and a pair of shoulder straps 16. A pair of shoulder straps 16 are secured to the housing 14 to secure the housing 14 to the back of the user. The casing 14 supports the volute pump 12 via a plurality of vibration preventing members 13. The vibration preventing member 13 is a member having elasticity such as a spring or rubber. As an example, the housing 14 of the present embodiment is constituted by a plurality of parts (components) including a base member 14a and a cover member 14 b. The cover member 14b is assembled to the base member 14a, and the base member 14a and the cover member 14b face each other across the volute pump 12.

Two battery ports 18 are provided in the housing 14. One battery pack 2 is detachably mounted to each battery interface 18. Each battery interface 18 is provided with a battery terminal 18 a. The battery terminal 18a is electrically connected to the battery pack 2 mounted on the battery interface 18. The battery terminal 18a includes a pair of power terminals and a plurality of communication terminals. The number of battery interfaces 18 is not limited to two, and blower 10 may have at least one battery interface 18.

The blower 10 has a discharge nozzle 20 connected to the volute pump 12 and an operating handle 22 provided on the discharge nozzle 20. The operation handle 22 is provided with a plurality of switches that are operated by a user, such as a trigger member 24. When the user operates the trigger member 24, the volute pump 12 is supplied with electric power from one or both of the battery packs 2, and the volute pump 12 is started. Thereby, the blower 10 discharges air from the discharge nozzle 20.

The volute pump 12 has a volute 26, an impeller 28 located within the volute 26, and a motor 30 connected to the impeller 28. The volute 26 defines a suction port 26a, a volute chamber 26b, and a discharge port 26 c. The volute 26b extends in a spiral shape between the suction port 26a and the discharge port 26 c. The impeller 28 is fixed to a rotary shaft 30a of the motor 30, and the impeller 28 is rotatably supported in the volute 26 b. The motor 30 receives electric power from the battery pack 2 and drives the impeller 28 to rotate. When the impeller 28 is driven to rotate, the air sucked from the suction port 26a is accelerated in the volute 26b and then discharged from the discharge port 26 c. The discharge nozzle 20 is connected to a discharge port 26c of the scroll casing 26. In the blower 10 of the present embodiment, the motor 30 is located between the user and the scroll casing 26 when the user mounts the blower 10 in a predetermined posture, and the suction port 26a of the scroll casing 26 is opened toward the rear of the user (i.e., the side opposite to the user), but this case is not particularly limited.

Here, the discharge port 26c of the scroll casing 26 is located outside the housing 14. The volute 26 has a discharge duct 26d projecting from the housing 14, with a discharge port 26c at the top end of the discharge duct 26 d. The casing 14 is provided with a duct opening 14c through which the discharge duct 26d passes. As described above, the casing 14 supports the volute pump 12 via the plurality of vibration preventing members 13. Thus, a gap is provided between the discharge duct 26d and the duct opening 14c, thereby permitting relative displacement of the volute 26 with respect to the housing 14.

On the other hand, the majority of the volute pump 12 containing the motor 30 is located within the casing 14. In particular, the suction port 26a of the volute 26 is located within the housing 14, and thus, the housing 14 is provided with external suction ports 40a, 40 b. The external suction ports 40a, 40b are one or more openings formed in the housing 14. Air paths 42, 42a, and 42b extending from the external suction ports 40a and 40b to the suction port 26a of the scroll casing 26 are defined in the casing 14.

The blower 10 also has a motor controller 32. The motor controller 32 is electrically connected with the battery terminal 18a and the motor 30. Thereby, the discharge power of the battery pack 2 is supplied to the motor 30 via the motor controller 32. The motor controller 32 incorporates one or more power switching elements and controls the power supplied to the motor 30. The motor 30 of the present embodiment is a brushless DC motor, and the motor controller 32 has an inverter circuit built therein. The motor controller 32 faces an air path 42 within the housing 14. This can suppress a temperature rise of the motor controller 32 by the air flowing through the air path 42, but the above is not limited.

The motor controller 32 is assembled to the unit holder 34. The unit holder 34 is positioned inside the housing 14 and assembled to the housing 14. In addition to the motor controller 32, the battery terminal 18a is also assembled to the unit holder 34. According to such a configuration, in the manufacturing process of the blower 10, first, the motor controller 32 and the battery terminal 18a are assembled to the unit holder 34. Next, the unit holder 34 is assembled to the base member 14a of the housing 14 together with the motor controller 32 and the battery terminal 18 a. It is not necessary to separately assemble the motor controller 32 and the battery terminal 18a with respect to the housing 14, and therefore, the assembly of the motor controller 32 and the battery terminal 18a can be easily performed.

The specific structure of the unit holder 34 is not particularly limited. However, in the blower 10 of the present embodiment, the unit holder 34 is assembled across both the base member 14a (part 1) and the cover member 14b (part 2). With this configuration, the rigidity of the housing 14 can be increased by the unit holder 34. In addition, since the cell holder 34 is stably fixed to the case 14, vibration of the motor controller 32 and the battery terminal 18a can be suppressed. This can prevent electrical failure (e.g., contact failure) in the past.

As described above, since the motor 30 is disposed in the housing 14, the noise of the motor 30 can be suppressed from being radiated to the surroundings. However, the outer suction ports 40a and 40b are formed in the housing 14, and the noise of the motor 30 cannot be prevented from leaking to the outside through the outer suction ports 40a and 40 b. In this regard, in blower 10 of the present embodiment, external suction ports 40a, 40b are provided in bottom portion 14d of casing 14. When the user mounts the blower 10 in a predetermined posture, the bottom 14d of the casing 14 faces the floor surface, and the external suction ports 40a and 40b are opened vertically downward. That is, when the user uses the blower 10, the external suction ports 40a, 40b of the casing 14 are opened toward the floor. This allows noise leaking from the external suction ports 40a and 40b to be mainly emitted toward the ground, and can be suppressed from being dispersed to the surroundings.

Here, in the above-described predetermined posture (i.e., the posture in which the blower 10 is mounted on the back of the user), the suction port 26a of the scroll casing 26 opens in the horizontal direction. That is, the direction in which the suction port 26a of the scroll casing 26 opens and the direction in which the external suction ports 40a, 40b of the housing 14 open are orthogonal to each other. Further, the direction in which the suction port 26a of the scroll casing 26 opens is parallel to the rotation shaft 30a of the motor 30, that is, also parallel to the rotation shaft of the impeller 28.

The positions of the external suction ports 40a and 40b are not limited to the bottom 14d of the casing 14. However, if the external suction ports 40a and 40b are located at the bottom 14d of the casing 14, the external suction ports 40a and 40b are arranged at relatively low positions when the user mounts the blower 10 in a predetermined posture. This can effectively suppress the noise leaking from the external suction ports 40a and 40b from being radiated to the surroundings. From this viewpoint, the closer the positions of the external suction ports 40a, 40b are to the bottom 14d of the casing 14, the better. Therefore, the external suction ports 40a and 40b may be located below the rotation shaft 30a of the motor 30, or may be located further below the scroll casing 26.

In the blower 10 of the present embodiment, the bottom 14d of the housing 14 has a ground surface 44 that contacts the ground when the user places the blower 10 on the ground. The external suction ports 40a and 40b are provided at positions different from the ground surface 44. If the external suction ports 40a and 40b are provided on the ground surface 44, the external suction ports 40a and 40b are completely closed by the ground when the user places the blower 10 on the ground, which may be a problem when the motor 30 continues to rotate by inertia, for example. Thereby, at least a part of the external suction ports 40a and 40b can be provided at a position different from the ground surface 44.

As shown in fig. 4, in blower 10 of the present embodiment, external suction ports 40a, 40b have a 1 st external suction port 40a and a 2 nd external suction port 40 b. The air passages 42, 42a, and 42b include a 1 st air passage 42a extending upward from the 1 st external suction port 40a and a 2 nd air passage 42b extending upward from the 2 nd external suction port 40 b. The 1 st air path 42a and the 2 nd air path 42b are provided along the battery interface 18 and adjacent to the battery pack 2 mounted to the battery interface 18. With this structure, the temperature rise of the assembled battery 2 can be suppressed by the air flowing through the air paths 42a and 42 b.

Particularly, in the blower 10 of the present embodiment, the battery interface 18 is provided between the 1 st air path 42a and the 2 nd air path 42 b. The 1 st air path 42a is adjacent to the battery pack 2 mounted to one battery interface 18, and the 2 nd air path 42b is adjacent to the battery pack 2 mounted to the other battery interface 18. This can effectively suppress a temperature rise of each battery pack 2.

In the blower 10 of the present embodiment, the amount of air passing through the external suction ports 40a, 40b of the casing 14 is 95% or more of the amount of air passing through the suction port 26a of the scroll casing 26. In other words, there is substantially no other opening in the casing 14 other than the external suction ports 40a and 40 b. This prevents noise of the motor 30 from leaking to the outside of the casing 14 from the ground other than the external suction ports 40a and 40 b.

Next, the structure of the scroll casing 26 will be described with reference to fig. 5 and 6. As shown in fig. 5 and 6, the volute casing 26 has a casing main body 52 that partitions the volute chamber 26b, and a bell mouth 54 that protrudes from the casing main body 52 and partitions the suction port 26 a. The bell mouth 54 has a frustoconical shape with a cross-sectional area increasing from the suction port 26a toward the volute 26 b. The scroll casing 26 is formed of a resin material, and is constructed by combining a plurality of component parts. Each component is manufactured by die forming, but the above is not particularly limited.

In the volute 26, the required thickness of the bell mouth 54 (particularly the end of the bell mouth 54) is large relative to the required thickness of the casing main body 52. Therefore, if the bell mouth 54 is formed integrally with the case main body 52, the parts formed by integrating them have a structure with uneven thickness. In order to mold such a component with high precision by using a mold, it is conceivable to provide a so-called material reducing portion (japanese: steal み) in a portion of the bell mouth 54 having a large thickness. However, when the material reducing portion is provided in the portion of the bell mouth 54, a plurality of holes or grooves are formed in the surface of the bell mouth 54, which causes a problem of wind noise generation.

Regarding the above point, the scroll casing 26 of the present embodiment is constituted by combining a plurality of components. The plurality of components that make up the volute 26 in particular include a 1 st component 56 and a 2 nd component 58. The 1 st component part 56 constitutes at least a part of the case main body 52. The 2 nd component 58 is assembled to the 1 st component 56 and constitutes at least a part of the bell mouth 54. In this way, when at least a part of the bell mouth 54 is formed of a component separate from the case main body 52, the thickness unevenness structure of the 1 st component 56 constituting the case main body 52 can be eliminated or suppressed, and it is possible to eliminate the need to provide a material reducing portion on the surface of the bell mouth 54. This makes it possible to make the surface of the bell mouth 54 (particularly, the surface of the tip portion of the bell mouth 54) relatively smooth.

As an example, in the present embodiment, the 1 st component 56 also forms a part of the bell mouth 54, and the 2 nd component 58 is an annular member and forms the tip end portion of the bell mouth 54. When the 2 nd component 58 is an annular member, the suction port 26a of the scroll casing 26 can be formed with a smooth surface with high accuracy.

In the present embodiment, the 1 st component 56 is provided with a plurality of recesses 56 a. Which is a material reducing portion provided in the 1 st component 56. Similarly, the 2 nd component 58 is also provided with a plurality of recesses 58 a. This is also the material reducing portion provided in the 2 nd component 58. However, these recesses 56a, 58a are located at the joint surfaces between the 1 st part 56 and the 2 nd part 58. Thus, when the 1 st and 2 nd components 56 and 58 are combined, these recesses 56a and 58a are located between the 1 st and 2 nd components 56 and 58 and are not exposed to the outside. Therefore, the material reducing portions are provided in the respective components 56 and 58, but the surface (inner surface) of the bell mouth 54 can be formed smoothly.

As shown in fig. 3, 4, and 7, the blower 10 includes a plurality of sound absorbing members 62, 64, 66, and 68. A plurality of sound absorbing members 62, 64, 66, 68 are located inside the enclosure 14. The plurality of sound absorbing members 62, 64, 66, 68 include a 1 st sound absorbing member 62, a 2 nd sound absorbing member 64, a 3 rd sound absorbing member 66, and a 4 th sound absorbing member 68. Each sound absorbing member 62, 64, 66, 68 is made of sponge. The sponge referred to herein is a sponge-like (or porous) material in a wide range, and the material constituting the sponge is not particularly limited. The sound absorbing members 62, 64, 66, 68 can be made of a variety of materials such as resin materials and rubber materials.

The 1 st sound absorbing member 62 is mounted on the inner surface of the cover member 14b of the housing 14 so as to oppose the suction port 26a of the scroll casing 26. The 1 st sound absorbing member 62 is positioned on an extension line of the rotary shaft 30a of the motor 30, and can effectively absorb noise of the motor 30. As described above, the impeller 28 is fixed to the rotating shaft 30a of the motor 30. Therefore, the 1 st sound absorbing member 62 is also located on the extension line of the rotation shaft of the impeller 28. The 1 st sound absorbing member 62 generally has a disc shape.

The 2 nd sound absorbing member 64 is mounted to the inner surface of the base member 14a of the housing 14 between the base member 14a and the motor 30. The 2 nd sound absorbing member 64 is also positioned on the extension line of the rotating shaft 30a of the motor 30, and can effectively absorb the noise of the motor 30. The 2 nd sound absorbing member 64 is also located on the extension line of the rotation shaft of the impeller 28. The 2 nd sound absorbing member 64 faces the 1 st sound absorbing member 62 across the motor 30. By disposing the motor 30 between the two sound absorbing members 62, 64, the noise of the motor 30 can be effectively absorbed.

The 3 rd sound absorbing member 66 is attached to the base member 14a of the housing 14. The 3 rd sound absorbing member 66 has a cylindrical shape and is disposed so as to surround the motor 30 from a radial direction perpendicular to the rotation shaft 30a of the motor 30. Here, at least a part of the 3 rd sound absorbing member 66 may be formed integrally with the 2 nd sound absorbing member 64. The 3 rd sound absorbing member 66 does not have to have a cylindrical shape, and may have only a plate-like shape and be provided only in a part in the circumferential direction around the motor 30.

The 4 th sound-absorbing member 68 is mounted to the discharge duct 26d of the volute 26 and is provided in a gap between the discharge duct 26d of the volute 26 and the duct opening 14c of the casing 14. As described above, the casing 14 supports the scroll casing 26 via the plurality of vibration preventing members 13. Thus, the volute 26 is displaceable relative to the housing 14, and to allow this displacement, a gap needs to be provided between the discharge duct 26d and the duct opening 14 c. However, when a gap is provided between the discharge duct 26d and the duct opening 14c, there is a possibility that noise of the motor 30 leaks to the outside of the housing 14 through the duct opening 14 c. The 4 th sound absorbing member 68 can suppress such leakage of noise, and can allow relative displacement of the scroll casing 26 since it is made of soft sponge.

Claims (10)

1. A blower is characterized in that a blower body is provided with a blower body,

the blower is a blower held or mounted by a user, and has:

a scroll casing in which a suction port, a scroll chamber, and a discharge port are partitioned;

an impeller rotatably supported within the volute;

a motor connected to the impeller and driving the impeller;

a housing that houses the volute and the motor, an

A sound absorbing member located between the scroll casing and the housing and on an extension of a rotation axis of the motor.

2. The blower according to claim 1,

the sound absorbing member is also located on an extension of a rotation axis of the impeller.

3. The blower according to claim 1 or 2,

the sound absorbing member is opposite to the suction port of the scroll casing.

4. The blower according to claim 1,

the sound-absorbing member is mounted to an inner surface of the housing.

5. The blower according to claim 1,

the sound-absorbing member is made of sponge.

6. The blower according to claim 1,

the sound absorbing member has a 1 st sound absorbing member and a 2 nd sound absorbing member facing each other with the motor interposed therebetween.

7. The blower according to claim 1,

the blower further includes a cylindrical 3 rd sound absorbing member surrounding the motor in a radial direction perpendicular to a rotation axis of the motor.

8. The blower according to claim 1,

the volute has a discharge duct protruding to the outside of the housing,

the housing having a duct opening through which the discharge duct passes,

the blower further has a 4 th sound absorbing member provided in a gap between the duct opening and the discharge duct.

9. The blower according to claim 8,

the casing supports the scroll casing by means of at least one vibration preventing member.

10. The blower according to claim 1,

the blower is a backpack blower that is mounted on the back of a user.

Images