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CN-114658673-B - Blower fan

CN114658673BCN 114658673 BCN114658673 BCN 114658673BCN-114658673-B

Abstract

The invention provides a blower. The blower has a main body, a motor, and a fan. The fan is a single fan configured to rotate in response to rotation of the motor shaft and to discharge air from the discharge port. The maximum rotational speed of the motor shaft is in the range from 50000rpm to 120000 rpm. The blower is configured to be capable of changing the area of the discharge port by a user, and is configured to selectively operate in either a1 st mode or a 2 nd mode according to the area of the discharge port, wherein the 1 st mode is a mode in which the maximum wind force of air discharged from the discharge port is in a range from 2.5N to 5.0N when the motor is being driven at the highest rotational speed, and the 2 nd mode is a mode in which the maximum dynamic pressure of air discharged from the discharge port is in a range from 30kPa to 65kPa when the motor is being driven at the highest rotational speed. Accordingly, the user can change the area of the discharge port according to the operation content, and can perform the operation using the proper operation mode of the blower, thereby improving the convenience.

Inventors

  • NUMATA FUMITOSHI

Assignees

  • 株式会社牧田
  • 株式会社牧田

Dates

Publication Date
20260421
Application Date
20211222
Priority Date
20201223

Claims (7)

  1. 1. An air blower configured to discharge air from a discharge port, comprising: A main body; A motor which is housed in the main body and includes a motor main body portion including a stator and a rotor, and a motor shaft which is rotatable integrally with the rotor; A single fan accommodated in the main body and configured to rotate in response to rotation of the motor shaft to discharge air from the discharge port, and only one of the fans, The maximum rotational speed of the motor shaft is in the range from 50000rpm to 120000rpm, The main body is configured to be capable of being detached from one nozzle selected from a plurality of types of nozzles having different opening areas at the tip, The area of the discharge port can be changed in a range of not less than the area of a circle having a diameter of 6mm but not more than the area of a circle having a diameter of 15mm by attaching or detaching the nozzle to or replacing the nozzle with respect to the main body by a user, The blower is configured to selectively operate in either a1 st mode or a 2 nd mode according to the area of the discharge port, wherein the 1 st mode is a mode in which a maximum wind force of air discharged from the discharge port is in a range of from 2.5N to 5.0N when the motor is being driven at the maximum rotation speed, the 2 nd mode is a mode in which a maximum dynamic pressure of air discharged from the discharge port is in a range of from 30kPa to 65kPa when the motor is being driven at the maximum rotation speed, Also comprises a circuit board which is electrically connected with the motor main body part, The fan is located between an air inlet formed on the main body and the motor main body part in the axial direction of the motor shaft, The circuit board is located between the motor main body portion and the discharge port in the axial direction of the motor shaft.
  2. 2. The blower according to claim 1, wherein the blower is configured to, The diameter of the fan is in the range from 40mm to 45 mm.
  3. 3. A blower according to claim 1 or 2, wherein, The maximum rotational speed of the motor shaft is in the range from 70000rpm to 90000rpm, The maximum wind force of the 1 st mode is in a range from 3.0N to 4.0N, The maximum dynamic pressure of the 2 nd mode is in a range from 35kPa to 50 kPa.
  4. 4. A blower according to claim 3, wherein the air conditioner further includes a fan, The blower is configured to operate in the 1 st mode when the area of the discharge port is in a range of 12mm diameter circle area or more and 15mm diameter circle area or less, and to operate in the 2 nd mode when the area of the discharge port is in a range of 6mm diameter circle area or more and 8mm diameter circle area or less.
  5. 5. The blower according to claim 1, wherein the blower is configured to, The motor and the fan are accommodated in a shell, and form an integrated motor assembly together with the shell and the circuit board, The circuit board is disposed between the housing and the discharge port, In a radial direction of the motor, a space is provided between the motor assembly and an inner surface of the main body.
  6. 6. A blower according to claim 1 or 2, wherein, The rotational speed of the motor shaft can be varied.
  7. 7. The blower according to claim 6, wherein the blower is configured to, And a trigger which can be pressed by a user, The rotational speed of the motor shaft is changed according to the operation amount of the trigger.

Description

Blower fan Technical Field The present invention relates to an electric blower. Background An electric blower capable of blowing away dust or the like by discharging air from a discharge port is known. For example, japanese patent laying-open No. 2011-117442 discloses a blower (so-called dust blower) configured to generate compressed air by a centrifugal fan driven to rotate by a motor and to discharge the generated compressed air from a nozzle. Disclosure of Invention [ Problem to be solved by the invention ] The fan is a so-called multistage centrifugal fan, and includes a plurality of centrifugal fans arranged in an extending direction of the rotation axis. Such a blower tends to be easily enlarged in the extending direction of the rotation axis. The invention aims to provide a blower which is relatively small and has good convenience. [ Solution for solving the problems ] According to one aspect of the present invention, there is provided a blower configured to discharge air from a discharge port. The blower has a main body, a motor, and a fan. The motor is accommodated in the main body. The motor includes a motor body portion including a stator and a rotor, and a motor shaft rotatable integrally with the rotor. The fan is accommodated in the main body. The fan is a single fan configured to rotate in response to rotation of the motor shaft and to discharge air from the discharge port. The term "single fan" as used herein means only one fan for discharging air from the outlet. Therefore, it is not excluded to provide a fan for cooling the motor additionally. The maximum rotational speed of the motor shaft is in the range of 50000 revolutions per minute (rpm) to 120000 rpm. In the case where the rotational speed of the motor can be set in multiple steps or in a stepless manner, at least the highest value of any rotational speed that can be set may be within the range of the highest rotational speed of the motor. The blower is configured to be capable of changing the area of the discharge port by a user. The blower is configured to selectively operate in either one of the 1 st mode and the 2 nd mode according to the area of the discharge port. The 1 st mode refers to a mode in which the maximum wind force of the air discharged from the discharge port when the motor is being driven at the highest rotational speed is in the range from 2.5 newton (N) to 5.0N. The 2 nd mode refers to a mode in which the maximum dynamic pressure of air discharged from the discharge port when the motor is being driven at the highest rotational speed is in the range from 30 kilopascals (kPa) to 65 kPa. In the blower of this embodiment, there is only one fan for discharging air, and on the other hand, a motor with a relatively high rotational speed is used. Therefore, compared with a multistage blower having a plurality of fans, the main body can be miniaturized in the direction of the rotation axis of the fan, and a relatively strong wind force can be exerted. On the other hand, depending on the work, the blower may pay more attention to the pressure of the air to be discharged than the strength of the wind power. The blower of the present embodiment can selectively operate in the 1 st mode capable of exhibiting a relatively strong maximum wind force or in the 2 nd mode capable of exhibiting a relatively high maximum dynamic pressure according to the area of the discharge port. Therefore, the user can change the area of the discharge port according to the operation content, and can perform the operation using the proper operation mode of the blower, thereby improving the convenience. Drawings Fig. 1 is a cross-sectional view of a dust blower. Fig. 2 is a partial enlarged view of fig. 1. Fig. 3 is a partial rear view of the dust blower. Fig. 4 is a cross-sectional view of IV-IV of fig. 1. Fig. 5 is a perspective view of the motor assembly. Fig. 6 is a cross-sectional view of the motor assembly (with the support member and circuit board removed). Fig. 7 is a sectional view VII-VII of fig. 4 (wherein illustration of the supporting member and the circuit board is omitted). Fig. 8 is an exploded perspective view of the cylindrical housing, the seal ring, and the fixing member. Fig. 9 is an exploded perspective view of the main body, the 2 nd filter, the filter holder, the 1 st filter, and the intake side cover. Fig. 10 is a perspective view of the main body with the intake side cover removed. Description of the reference numerals 1, A dust blower; 10, an exhaust port; 20, a main body; 201 to left side case, 202 to right side case, 205 to 1 st space, 206 to 2 nd space, 21 to cylindrical case, 211 to concave portion, 213 to protruding piece, 215 to fixing member, 216 to peripheral wall portion, 217 to pressing portion, 218 to opening, 22 to receiving portion, 23 to nozzle portion, 230 to opening, 231 to nozzle mounting portion, 235 to locking mechanism, 24 to outer side case, 240 to opening, 241 to filter mounting portion, 243 to flange