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101. 发明专利

JP2001050194A ELECTRIC AIR BLOWER 失效
公开(公告)号：JP2001050194A
公开(公告)日：2001-02-23
申请号：JP22078899
申请日：1999-08-04
申请人： HITACHI LTD
发明人： SUGIMURA KAZUYUKI , HAYASHI SHOJI , JORAKU FUMIO , HARADA HIDEYUKI , TANAKA TEIJI
IPC分类号： A47L9/00 , F04D29/30
摘要： PROBLEM TO BE SOLVED: To provide an electric air blower having a centrifugal type impeller low in cost, highly efficient and low in noise and an electric cleaner on which the air blower is installed. SOLUTION: A centrifugal impeller is devised to fasten the impeller and an axis of rotation by using a screw member 44 having a horn type shape and so that a channel cross-section contraction percentage of an inlet curved part to be decided by the screw member 44 becomes larger toward the latter half pf the channel. Consequently, a flow is effectively contracted in the latter half of the curved channel where the flow becomes easier to be peeled, development of a boundary layer is restrained and fluid loss and noise are reduced.

102. 发明专利

JP2001017358A VACUUM CLEANER 失效
公开(公告)号：JP2001017358A
公开(公告)日：2001-01-23
申请号：JP19121299
申请日：1999-07-06
申请人： HITACHI LTD
发明人： HAYASHI SHOJI , TANAKA TEIJI , SUGIMURA KAZUYUKI , SATO SHIGENORI , JORAKU FUMIO , IKEDA RYUJI , TAJIMA TAIJI
IPC分类号： A47L9/00 , A47L5/30 , A47L9/04 , F04D29/44
摘要： PROBLEM TO BE SOLVED: To provide a vacuum cleaner of a reduced weight, size and improved dust collecting performance by providing an electric blower of a reduced weight, size and high efficiency. SOLUTION: In a vacuum cleaner provided with dust collecting chamber, a blower 106, a single motor 103 and a rotary cleaning body in the main body of a suction port body to drive the blower 106 and the rotary cleaning body by means of the electric motor 103, the impeller 212 of the blower 1-6 is made a diagonal flow type. Thus, the blower can be minimized to reduce the weight and scale of the vacuum cleaner. In addition, an efficient electric blower is provided.

103. 发明专利

JP2000170693A CENTRIFUGAL DIFFUSER AND ELECTRIC FAN PROVIDED THEREWITH 失效
公开(公告)号：JP2000170693A
公开(公告)日：2000-06-20
申请号：JP35227398
申请日：1998-12-11
申请人： HITACHI LTD
发明人： HAYASHI SHOJI , TANAKA TEIJI , HARADA HIDEYUKI , SATO SHIGENORI , SUGIMURA KAZUYUKI , JORAKU FUMIO
IPC分类号： F04D17/10 , F04D29/44
摘要： PROBLEM TO BE SOLVED: To improve the efficiency of a fan by forming a vane overlap part sandwiched between air guides adjacent to each other so as to gradually shrink an expanded angle from a front edge part to a back edge part, in a diffuser having a plurality of the air guides, which is provided on an outer peripheral part of a centrifugal impeller. SOLUTION: An electronic fan is provided with a centrifugal impeller, fan casing storing the centrifugal impeller by sandwiching from both sides, a diffuser 11 provided on an outer peripheral part of an extended impeller, and a static channel part having a return guide on a back surface of the diffuser 11. The diffuser 11 decides the shape of a air guides 11a so as to draw a circle contacting with a pressure surface 11b and a negative pressure surface 11c of the adjacent air guides 11a, at an entrance port of a vane overlap part 11d sandwiched between the air guides 11a adjacent to each other, and to draw a circle contacting with the pressure surface 11b and the negative pressure surface 11c in such a way to contact with the above mentioned circle, and also to successively draw a circle between an exit of the vane overlap part in the same way.

104. 发明专利

JP2000073993A ELECTRIC FAN 失效
公开(公告)号：JP2000073993A
公开(公告)日：2000-03-07
申请号：JP24470698
申请日：1998-08-31
申请人： HITACHI LTD
发明人： HARADA HIDEYUKI , JORAKU FUMIO , AKOSHIMA KAZUHIRO
IPC分类号： F04D17/10 , F04D29/42
摘要： PROBLEM TO BE SOLVED: To improve the efficiency of a fan by forming an annular part between a fan casing and a top surface of a diffuser, and bonding the annular part to the top surface of the diffuser for integration. SOLUTION: An annular part 24 is formed between a fan casing and a top surface of a diffuser, and the annular part 24 is bonded to the top surface of the diffuser for integration, and a clearance formed by rugged parts of the fan casing is thereby sealed by a flat surface 22, which contacts with the fan casing, and a clearance due to drop or deformation of the diffuser is sealed by bonding to the top surface of the diffuser so as to restrict the lowering of performance at the minimum. Generation of flutter of a sheet due to the air flowing in a diffuser flow passage in the case where the sheet is interposed is prevented by forming the annular part 24 from the same material of the diffuser or the similar synthetic resin and having rigidity, and lowering of performance of an electric fan due to the generation of noise and increase of the air resistance can be prevented.

105. 发明专利

JPH11351196A ELECTRIC BLOWER AND ELECTRIC CLEANER MOUNTED THEREWITH 失效
公开(公告)号：JPH11351196A
公开(公告)日：1999-12-21
申请号：JP15951698
申请日：1998-06-08
申请人： HITACHI LTD
发明人： SUGIMURA KAZUYUKI , WATANABE MASATOSHI , JORAKU FUMIO , NAKAI TAKAHIRO
IPC分类号： A47L9/00 , F04D17/10 , F04D29/44 , F04D29/66
摘要： PROBLEM TO BE SOLVED: To provide an electric blower capable of saving a space, obtaining noise reducing effect, independent of the condition of an air flow, and having a diffuser structure with less loss of an air flow, and an electric cleaner mounted therewith. SOLUTION: At least one through-hole 32 is provided in a plate of the other stator blade ranging from the exit end 30 of one stator blade in an overlapping area air flow passage held between both adjacent stator blades in a diffuser 11 for diverting and discharging an air flow to a position of adding an opening end correction value δto provide communicating performance for adjacent air flow passages. In this way, the resonance and thus mutual increase of sound is prevented in the overlapping area air flow passage and the interference noise of an electric blower and an electric cleaner mounted therewith is reduced.

106. 发明专利

JPH1155885A MOTOR-DRIVEN BLOWER AND ELECTRIC CLEANER USING THE SAME 失效
公开(公告)号：JPH1155885A
公开(公告)日：1999-02-26
申请号：JP21093997
申请日：1997-08-05
申请人： HITACHI LTD
发明人： HARADA HIDEYUKI , JORAKU FUMIO , TOYOSHIMA HISANORI , MIYASHITA KUNIO , AKOJIMA KAZUHIRO
IPC分类号： A47L9/00 , F04D29/00 , H02K3/487
摘要： PROBLEM TO BE SOLVED: To provide a motor-driven blower and an electric cleaner using it wherein its slot wedge is prevented from the danger of the damaging thereof, even though the centrifugal force applied to its slot wedge is increased by its high-speed rotation. SOLUTION: In a motor-driven blower, providing its centrifugal fan coupled to the rotational shaft of its commutator motor, the air flow sucked by the centrifugal fan is exhausted to its outside, passing through the inside of the commutator motor. In the commutator motor to be an air-flow passage, each rotor winding 19 is disposed in each slot of its rotor core 18, and in each slot, positioning each slot wedge 20 with a protruding portion on the more outer peripheral side than each rotor winding 19, it is so formed that the outer peipheral surface of each slot wedge 20 nearly coincides with the one of the rotor core 18. In this case, each slot wedge 20 is made of a glass fiber reinforced resin with the added glass fiber of 10-50% thereto.

107. 发明专利

JPH1132464A METHOD FOR CORRECTING BALANCE OF ROTATOR 失效
公开(公告)号：JPH1132464A
公开(公告)日：1999-02-02
申请号：JP18478597
申请日：1997-07-10
申请人： HITACHI LTD
发明人： KIHARA MANABU , GOMITA HISAMITSU , JORAKU FUMIO , TOYOSHIMA HISANORI
IPC分类号： H02K7/14 , H02K15/16
摘要： PROBLEM TO BE SOLVED: To greatly reduce the vibration force for inducing the primary bend mode of a rotor, by performing dynamic correction on the correction surface of both edges in a first balance correction, and performing correction on a correction surface that differs from the first balance correction surface. SOLUTION: After dynamic balance correction, the vector sum of unbalance remaining at both edges of a core 18 is calculated, an area (in this case, an area between both end faces of the core 18 or the central part of the core 18) on the outer-periphery surface of the core 18 that differs from both edge parts of the core 18 where dynamic balance correction is made is cut by a cutter when the vector sum is equal to or more than a specific value, and static balance correction is made, thus making correction to a specific value or less. By performing the static balance correction of a rotor 4, balance correction considering a phase can be performed, thus greatly reducing the vibration force for inducing the primary bending mode of the rotor 4. Also, the deflection of a rotary shaft 15 on high-speed rotation can be suppressed.

108. 发明专利

JPH1073093A MOTOR-DRIVEN BLOWER 失效
公开(公告)号：JPH1073093A
公开(公告)日：1998-03-17
申请号：JP22970796
申请日：1996-08-30
申请人： HITACHI LTD
发明人： AKOSHIMA KAZUHIRO , JORAKU FUMIO , IIZUKA SEIJI , IKEDA RYUJI
IPC分类号： F04D29/44
摘要： PROBLEM TO BE SOLVED: To prevent any air flow from leaking from a fitting part so as to improve a blast efficiency, in the case of a device in which the outer frame of an electric motor is fitted in a hole provided in a straightening plate through which a rotary shaft penetrates, by interposing a member having a hole of its diameter smaller than the inner diameter of a fitting part and having its hardness lower than that of the straightening plate, in its fitting part. SOLUTION: An electric motor-driven blower 1 exhausts air which has been guided to flow in from the air intake port 15 of a casing 14 by means of the rotation of a fan 12 owing to a rotor 6, through the fan 12 and a straightening plate 13. This plate 13 is fitted in the bearing part of an end bracket 16, but in this case, a member 17 made of rubber or the like having opened a hole whose diameter is smaller than the outer diameter of the bearing part is inserted in the fitting part and the plate 13 is attached thereto in such a way as pinching the member 17. And the height of this member 17 is made higher than a gap between the end bracket 16 and the plate 13 when this plate 13 is inserted in the bearing. In this way, the member 17 is deformed in compliance with configurations of the end bracket 16 and the plate 13 so as to be tightly contacted.

109. 发明专利

JPH0998918A VACUUM CLEANER 失效
公开(公告)号：JPH0998918A
公开(公告)日：1997-04-15
申请号：JP25635695
申请日：1995-10-03
申请人： HITACHI LTD
发明人： SATO SHIGENORI , IWASE KOJI , JORAKU FUMIO , TOYOSHIMA HISANORI , NAKAI TAKAHIRO , TAWARA KAZUO , ABE TAKASHI
IPC分类号： A47L9/28 , A47L9/22 , F04D29/28
摘要： PROBLEM TO BE SOLVED: To increase the efficiency of an electric air blower, i.e., the suction work done of a cleaner and at the same time, realize cost reduction and miniaturization/weight reduction by setting the coefficient of discharge and the specific rate to a specific range for the electric air blower incorporated in a vacuum cleaner. SOLUTION: A vacuum cleaner equipped with an electric air blower consisting of a motor and a centrifugal impeller in the main body of the vacuum cleaner, uses such an electric air blower that the coefficient of discharge ϕe sought by formula ϕe=Q/(60.π.D2 .b2 .u2 ) falls within the range of 0.03-0.05, and also the specific rate Ns sought by formula Ns=(N.Q .H ) is set to the range of 140-180. In this case, Q is air capacity (m /min), D is the configuration (m) of a centrifugal impeller, b2 is the exit width (m) of the centrifugal impeller, u2 is the convergence (m/min) of the outer periphery of the impeller, N is rotational frequency (r/min) and H is head (m). Power consumption in the maximum air capacity zone of the electric air blower should preferably be about 1K(k).

110. 发明专利

JPH0928641A VACUUM CLEANER 失效
公开(公告)号：JPH0928641A
公开(公告)日：1997-02-04
申请号：JP17885495
申请日：1995-07-14
申请人： HITACHI LTD
发明人： TAWARA KAZUO , ABE TAKASHI , ITO MOTOYA , JORAKU FUMIO , TOYOSHIMA HISANORI , MIYASHITA KUNIO , IWASE KOJI , SATO SHIGENORI
IPC分类号： A47L9/28 , F04D29/28
摘要： PROBLEM TO BE SOLVED: To make a vacuum cleaner highly efficient, small-sized and lightweight by setting the fan diameter at a specific value with the revolution speed of the electric blower set at a specific value in a specific range of the air capacity. SOLUTION: An electric blower is structured with a motor part 20 and a fan part 30, the motor part 20 being a commutator motor, with a stator 23 and a rotor 24 stored in a space partitioned by a bottomed tubular housing 21 having one end open and by an end bracket 22. An air flow produced by the fan part 30 is introduced to the motor part 20 through an air vent formed in the end bracket 22, circulated inside the motor part 20 for cooling, and discharged outside from an exhaust port 21a formed on the outer circumferential wall of the housing 21. In this case, in the air capacity in a range of approximately 1.0m /min, with the revolution speed of the blower set at 40,000rpm, the fan diameter is made about 95mm or less, and with the speed at 50,000rpm, the fan diameter is made about 76mm or less.

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