JP2016171605A - Electric blower for refrigeration and freezing machine and refrigeration and freezing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that an electric motor element obstructs an air channel and causes reduction of an air quantity in an electric blower for a freezing and refrigeration storage.SOLUTION: An electric motor element 1 includes a stator 5 comprising a stator core 2 formed by laminating a magnetic material, and a winding 4 wound around teeth through an insulator 3, and a rotor 8 having a permanent magnet 7 which confronts the inside of the stator through a slight gap in the circumferential direction, freely rotatably held by the shaft 6, and is magnetized at multiple poles. The electric motor element 1 is covered with a hub of an axial fan 11 including a plurality of blades 9 and a cup-shaped hub 10, and the shaft 6 of the electric motor element and the center of the hub 10 of the axial fan are fixed to each other to rotate the axial fan. A circuit wiring board 13 to which a controller constituting component for controlling a power supply connection body 12 and the winding of the stator is secured is disposed at the counter-fan-side of the electric motor element. Plural mounting feet 14 to be secured to a freezing machine are provided.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electric blower for refrigeration equipment that forcibly circulates cold air in a refrigerator or freezer.

  Since refrigeration equipment such as a refrigerator is always in operation, it is a large power consuming equipment in the home. Therefore, power saving and noise reduction are desired. In the refrigeration equipment, the compressor consumes the most electric power. However, by effectively forcibly circulating the cool air in the refrigerator with the electric blower, the temperature in the refrigerator becomes low, and the load on the compressor can be reduced. As a result, there is an increasing demand for electric blowers for refrigeration and refrigeration equipment with high efficiency, high air volume, and low noise.

Japanese Patent Laid-Open No. 2-242066 Japanese Patent Laid-Open No. 2005-20802

  However, for example, in the conventional electric blower shown in Patent Document 1 or the like, the motor element is larger than the hub of the fan, and thus cannot be installed in the hub, and the fan and the motor element must be assembled with a distance in the axial direction. I had to. For this reason, the electric motor element hinders the flow field generated by the fan, leading to a reduction in blowing efficiency. Further, the resonance frequency of the electric blower is lowered by increasing the axial length of the electric motor element, and if it is within the rated drive range, it becomes a noise factor.

  Further, for example, as in Patent Document 2, there is an electric blower in which an outer rotor type electric motor element is installed in a hub of a fan. The outer rotor type motor element has a cantilever structure, and the same output comparison tends to have a larger rotor outer diameter than the inner rotor type, which increases rotor runout and reduces the air gap with the stator. Difficult to do. As a result, there has been a problem that the noise is deteriorated and the efficiency is reduced due to an increase in vibration.

  A first invention includes an axial fan in which a plurality of blades and a cup-shaped hub are integrally formed, and an electric motor element for rotationally driving the axial fan, and an output shaft and a shaft of the electric motor element The fan at the center of the flow fan hub is fixed, and the electric motor element is disposed inside the hub of the axial fan, the electric fan for refrigeration equipment, wherein the electric motor element is a plurality of teeth disposed substantially radially, A stator core having a yoke for connecting teeth at the outer peripheral portion, a wide tip portion of the tooth provided at the tip of the tooth, and a slot open provided between the wide portions of the adjacent tip of the teeth, and an insulator to the tooth A stator composed of windings wound via a winding, a resin sheathing that covers at least a portion of the stator by integrally molding, and a small amount of the stator inside the stator. And a rotor that is rotatably supported and generates a field with a permanent magnet, and further includes a plurality of mounting legs that have holes for mounting the electric blower in the resin sheath. It is an electric blower for refrigeration equipment.

  2nd invention is an electric blower for refrigeration refrigeration equipment in which the upstream of the flow by the axial fan of the mounting foot is chamfered or R-shaped in the 1st invention.

  A third aspect of the present invention is the electric blower for refrigeration and refrigerating equipment according to the first aspect, wherein the protrusion formed at the center of the hub of the axial fan has a substantially chevron shape.

  In a fourth aspect based on the first aspect, the axial height of the blades of the axial fan is higher on the tip side of the axial fan than on the hub of the axial fan. It is an electric blower for refrigeration equipment with larger dimensions.

  A fifth invention is the electric blower for refrigeration refrigerator equipment according to the first invention, wherein the position of the tip side leading edge of the blade of the axial fan is located forward of the hub side front edge in the rotation direction.

  According to a sixth invention, in the first invention, the stator winding of the motor element is a concentrated winding, a three-phase winding is provided in nine slots, and the number of poles of the permanent magnet is ten. It is an electric blower for refrigeration equipment.

  In a seventh aspect based on the first aspect, the material of the core part of the winding wound around the teeth via an insulator is copper, aluminum, a copper alloy containing copper, an aluminum alloy containing aluminum, a trace amount It is an electric blower for refrigeration equipment made of aluminum containing such inevitable impurities or copper containing a small amount of inevitable impurities.

  In an eighth aspect based on the first aspect, the material of the core wire portion of the winding wound around the teeth via an insulator is aluminum, a copper alloy containing copper, an aluminum alloy containing aluminum, a small amount of inevitable An electric blower for refrigeration refrigerating equipment, which is aluminum containing impurities or copper containing a small amount of inevitable impurities, and has copper or a copper alloy containing copper in a layer between the insulating coating of the winding and the core wire portion.

  A ninth invention is an electric blower for refrigeration and refrigeration equipment, wherein the bearing of the electric motor element is a sliding bearing in the first invention.

  A tenth aspect of the present invention is the electric blower for a refrigeration refrigerator apparatus according to the first aspect, wherein the permanent magnet of the rotor is a molded body obtained by molding a plastic magnet material into a cylinder shape.

  An eleventh aspect of the invention is the circuit according to the first aspect, wherein a stator part of an electric motor element comprising the windings, a core, and the like, and a power supply connector of the electric motor element and a control part component for controlling the stator winding are attached. It is an electric blower for refrigeration equipment having a configuration in which the wiring board is installed on the side opposite to the fan of the stator.

  A twelfth aspect of the present invention is the refrigerated refrigeration comprising the wiring for supplying the power source to the drive coil of the motor element, the control element, and a circuit wiring board including a control unit comprising circuit elements such as the drive element. It is an electric blower for equipment.

  In a thirteenth aspect according to the first aspect, at least a part of the stator and a power source connection body of the motor element and a circuit wiring board to which a control part component for controlling the stator winding is attached are integrally formed and covered. It is an electric blower for refrigeration equipment which comprises the resin sheathing body.

In a fourteenth aspect based on the first aspect, when the number of poles of the rotor of the motor element is p, the number of slots is s, the number of blades of the fan is z, and an arbitrary natural number is n,
This is an electric blower for refrigeration equipment having a configuration in which p ≠ nz or s ≠ nz.

In a fifteenth aspect based on the first aspect, when the number of poles of the rotor of the motor element is p, the number of slots of the stator is s, the number of blades of the fan is z, and an arbitrary natural number is n,
This is an electric blower for refrigeration equipment having a configuration in which z ≠ np or z ≠ ns.

  A sixteenth aspect of the invention is a refrigeration refrigerator equipped with the electric blower for the refrigerator refrigerator of the first invention.

  As described above, according to the present invention, it is possible to realize a compact electric blower having a large air volume and a short shaft length with low vibration and low noise.

(A) Front view of electric blower showing embodiment of the present invention, (b) AOB sectional view of electric blower showing embodiment of the present invention, (c) Rear view of electric blower showing embodiment of the present invention (A) Side view of conventional electric blower, (b) Rear view of conventional electric blower (A) The figure which shows the flow of the airflow of the electric blower of this invention, (b) The rear view of the electric blower of this invention, (c) The figure which shows the flow of the airflow of the electric blower of a prior art example, (d) The example of a prior art example Rear view of electric blower The graph which shows the pressure coefficient by the fluid analysis of this invention and a prior art example (A) The figure which shows the 1st example of the attachment leg shape of an electric motor element, (b) The figure which shows the 2nd example of the attachment leg shape of an electric motor element, (c) The figure which shows the 3rd example of the attachment leg shape of an electric motor element (A) The figure which shows the 1st example of the hub shape of a fan, (b) The figure which shows the 2nd example of the hub shape of a fan. The conceptual diagram which shows the winding state of the motor element of the Example of this invention The figure which shows the circuit structure of the electric motor element of the Example of this invention.

  The present invention will be described below with reference to the drawings and tables. In addition, this invention is not limited by the following examples.

  The electric blower for refrigeration equipment of this invention is shown to Fig.1 (a)-(c). An electric motor element 1 has a stator core 2 composed of a magnetic material laminated stator core 2 and a winding 4 wound around the teeth with an insulator 3 interposed therebetween, and is opposed to the inside of the stator in the circumferential direction through a slight gap. The rotor 8 is rotatably held by the shaft 6 and has a rotor 8 having a permanent magnet 7 magnetized with a plurality of poles.

  The motor element 1 is covered with a hub of an axial fan 11 including a plurality of blades 9 and a cup-shaped hub 10, and the shaft 6 of the motor element and the center of the hub 10 of the axial fan are fixed, thereby the axial fan. Is driven to rotate. On the side opposite to the fan of the motor element, a circuit wiring board 13 to which a power connector 12 and a control part component for controlling the winding of the stator are attached. A plurality of attachment feet 14 for attachment to the refrigeration equipment are provided.

  In the conventional electric blower shown in FIGS. 2A and 2B, the motor element is larger than the fan hub, and it is necessary to install the fan and the motor element at a certain distance in the direction of the rotation axis. That is, as shown in FIGS. 3A and 3B, the flow of the air flow generated by the axial fan collides with the motor element portion indicated by the oblique lines in the drawing, causing a loss. On the other hand, in the electric blower of the present embodiment, since the electric motor element including the circuit wiring board is housed inside the hub of the axial fan, the wind generated by the fan as shown in FIGS. The flow loss is not hindered, the fluid loss is reduced, and a high air volume can be obtained.

  4A to 4C show a comparison of pressure coefficients between the conventional example and the present invention. From the fluid analysis, it was found that the fan output was increased by about 10% in the present invention.

  The shape of the attachment foot 14 to the refrigeration equipment main body provided in the motor element is such that the air has a large angle from the axial direction as shown in FIG. 5A by providing a chamfer or R on the upstream side. 5 (b) to (c), the rapid change in the flow direction is alleviated, and the separation vortex generated at the edge portion 14a of the mounting foot is suppressed. Further fan efficiency and noise reduction can be achieved.

  When the axial fan generates a flow toward the motor element side, as shown in FIG. 6, the hub protrusion 10a for fitting with the shaft 6 of the motor element is formed into a substantially mountain shape, so that the collision flow to the hub is reduced. It is possible to suppress the air blowing performance.

  Further, in the case of an axial fan, the amount of work on the fluid increases as the radial distance from the center of rotation increases. By making the axial height Ht of the tip side 9a of the blade with a large work volume higher than the axial height Hh of the hub side 9b, the flow can be captured more upstream and work can be given to the fluid. More airflow can be obtained.

  Further, by positioning the front edge 9c of the blade of the axial fan at the tip side in front of the hub side in the rotation direction, the front edge does not simultaneously cut the radial component of the flow and is dispersed in time. Therefore, fluid noise can be reduced.

  FIG. 7 shows a detailed configuration of the motor element portion. The stator core 2 includes a plurality of teeth 15 arranged substantially radially, a yoke 16 that connects the teeth at the outer peripheral portion, a teeth tip wide portion 17 provided at the teeth tip, and the adjacent tooth tip wide portions. And a slot opening 18 provided therebetween.

  The nine teeth of the stator core are wound with concentrated windings through insulators. The first phase is forward rotation, reverse rotation, forward rotation, and second phase are teeth I, teeth II, and teeth III, respectively. Teeth IV, teeth V, and teeth VI are forward, reverse, and forward, respectively, and the third phase is applied to teeth VII, teeth VIII, and teeth IX in the forward, reverse, and forward directions, respectively. By adopting a 10-pole 9-slot structure, it is possible to reduce cogging torque and reduce noise caused by the motor elements.

  Conventionally, copper or a copper alloy was used as the material of the core portion of the winding wound around the teeth. However, from the viewpoint of resource saving, resource depletion and economy, an alloy containing at least copper and aluminum, Aluminum or aluminum alloy containing impurities may be used.

  Further, the material of the core part of the winding is aluminum, a copper alloy containing copper, an aluminum alloy containing aluminum, aluminum containing a trace amount of inevitable impurities, or copper containing a trace amount of inevitable impurities, and the insulation coating of the winding You may employ | adopt the clad wire which has a copper alloy containing copper or copper in the layer between and the said core wire part. By using this clad wire, it is possible to eliminate the problem of conducting wire bonding in a non-copper wire winding.

  A sliding bearing 19 is provided inside the stator core, and the shaft 6 of the electric motor element is rotatably held.

  The rotor in the present invention is formed by molding a plastic magnet material into a cylinder shape, and has a plurality of N and S magnetic poles on the outer periphery. In addition, you may use the magnet by not only the said material but other materials, such as a rubber magnet and a sintered magnet. Moreover, you may comprise not only a cylinder shape but combining several magnetic pole pieces.

  FIG. 8 shows a circuit block diagram of the electric motor element of the present invention. The supplied DC power is supplied to the circuit of the motor element through the power connector 12. The circuit wiring board 13 (printed circuit board) is supplied to a control unit composed of wiring for supplying DC power to a drive coil (winding 4) of a motor element, a magnetic pole detection element, a control element and a drive element, and other circuit elements. Wiring is provided. A stator is attached to this, and is disposed on the opposite side of the fan from the motor element.

  The stator outer body 20 is formed by integrally molding the circuit wiring board 13, the stator 5, the connector with the connecting line of the power connection body, and the control part constituent parts with a molding material and integrating the parts and the printed circuit board. .

  The molding material is appropriately selected from an unsaturated polyester resin, a phenol resin, an epoxy resin, or the like of a thermosetting resin. Further, the molding material may be appropriately selected from polyethylene terephthalate resin, polybutylene terephthalate resin, and the like, which are thermoplastic resins.

  An airflow fan is mounted from the tip end side of the shaft of the motor element unit to constitute a blower.

  In this embodiment, an electric blower having 10 poles and 9 slots as motor elements and four fan blades is shown. If the number of poles of the rotor of the motor element is p, the number of slots of the stator is s, the number of blades of the fan is z, and an arbitrary natural number is n, the vibration frequency and fan of the motor element due to the electromagnetic force of p ≠ nz or q ≠ nz Since the frequency of the wind noise does not match, noise as an electric blower can be reduced.

  The same effect can be obtained even when z ≠ np or z ≠ ns. However, since each vibration can be reduced by the configuration of the motor element and the design of the fan, the relative relationship satisfying the above is not limited.

  In the present embodiment, a 10-pole 9-slot motor element structure is shown, but the present invention is not limited to this, and 8-pole 9-slot, 10-pole 12-slot, and 4-pole 6 having 2: 3 poles: slot number. Slots, 6 poles, 9 slots, 8 poles, 12 slots, 4 poles, 3 slots, 8 poles, 6 slots, etc. with a slot number of 4: 3 may be used. From the combination of the cogging torque and torque pulsation of the motor element and the number of blades It is possible to suppress the vibration / noise of the electric blower by selecting so that the least common multiple becomes large.

  Moreover, although the example which a fan works toward the electric motor element side was shown, the fan which generate | occur | produces a reverse flow may be used.

  Moreover, although the example using the cheap sliding bearing was shown, it is not restricted to this, You may use a ball bearing etc.

  This blower is incorporated in a refrigerator or the like of equipment such as a refrigerator, and can efficiently circulate cold air and improve cooling performance.

  The electric motor of the present invention suppresses the occurrence of electrolytic corrosion of the bearing, and is useful for an electric motor mounted on a device such as an air conditioner indoor unit that is mainly required to reduce the price and increase the life of the electric motor.

DESCRIPTION OF SYMBOLS 1 Electric motor element 2 Stator core 4 Winding 5 Stator 7 Permanent magnet 8 Rotor 9a Tip side 9b Hub side 9c Front edge 10 Hub 10a Protrusion of hub 11 Axial fan 13 Circuit wiring board 14 Mounting foot 14a Edge portion of mounting foot 16 Yoke 17 Teeth tip wide part 18 Slot open 19 Slide bearing 20 Stator exterior

Claims (16)

An axial fan in which a plurality of blades and a cup-shaped hub are integrally formed, and an electric motor element for rotationally driving the axial fan, the output shaft of the electric motor element and the center of the hub of the axial fan In the electric blower for refrigeration and refrigeration equipment in which the protrusion is fixed and the electric motor element is arranged inside the hub of the axial fan, the electric motor element includes a plurality of teeth arranged in a substantially radial manner, and the teeth on the outer peripheral portion. A stator core having a yoke to be connected, a tooth tip wide portion provided at the tip of the teeth, and a slot open provided between the adjacent tooth tip wide portions, and a winding wound around the teeth via an insulator. A stator composed of wound windings, a resin sheathing that integrally covers at least a portion of the stator, and a small gap between the stator and the stator. A refrigerating and refrigerating machine comprising a rotor which is opposed to and rotatably supported and generates a field by a permanent magnet, and further includes a plurality of mounting legs having holes for mounting the electric blower in the resin sheath Electric blower. The electric blower for refrigeration refrigerator equipment according to claim 1, wherein the upstream side of the flow by the axial fan of the mounting foot is chamfered or rounded. In the electric blower for refrigeration equipment according to claim 1,
An electric blower for refrigeration and refrigerating equipment, wherein a protrusion formed at the center of the hub of the axial fan has a substantially chevron shape. 2. The electric blower for refrigeration equipment according to claim 1, wherein the axial height of the blades of the axial fan is closer to the tip side of the axial fan than the height of the hub of the axial fan. Electric blower for refrigeration equipment with larger height dimensions. The electric blower for refrigeration refrigerating equipment according to claim 1, wherein the position of the tip side leading edge of the blade of the axial flow fan is positioned forward of the hub side front edge in the rotation direction. The electric blower for refrigeration equipment according to claim 1, wherein the stator winding of the motor element is a concentrated winding, a three-phase winding is applied to nine slots, and the number of poles of the permanent magnet is ten. Electric blower for refrigeration equipment provided. The electric blower for refrigeration refrigerator equipment according to claim 1, wherein the material of the core portion of the winding wound around the teeth via an insulator is copper, aluminum, a copper alloy containing copper, and an aluminum alloy containing aluminum An electric blower for refrigeration equipment made of aluminum containing a trace amount of inevitable impurities or copper containing a trace amount of inevitable impurities. The electric blower for refrigeration equipment according to claim 1, wherein the material of the core wire portion of the winding wound around the teeth via an insulator is aluminum, a copper alloy containing copper, an aluminum alloy containing aluminum, a trace amount Electricity for refrigeration and refrigeration equipment, which is aluminum containing inevitable impurities or copper containing trace amounts of inevitable impurities, and has copper or a copper alloy containing copper in a layer between the insulating coating of the winding and the core wire portion Blower. The electric blower for refrigeration refrigeration equipment according to claim 1, wherein the electric motor element has a configuration in which a bearing of the electric motor element is a sliding bearing. The electric blower for refrigeration refrigerating equipment according to claim 1, wherein the permanent magnet of the rotor is a molded body obtained by molding a plastic magnet material into a cylinder shape. The electric blower for refrigeration and refrigerating equipment according to claim 1, wherein a stator part of an electric motor element comprising the winding and a core, etc., and a power supply connector of the electric motor element and a control part component for controlling the stator winding are attached. An electric blower for refrigeration equipment having a configuration in which the circuit wiring board is installed on the side opposite to the stator fan. The electric blower for refrigeration equipment according to claim 1, further comprising a circuit wiring board including a wiring for supplying the power to a drive coil of the motor element, a control element, and a control unit including circuit elements such as the drive element. Electric blower for refrigeration equipment. In the electric blower for refrigeration equipment according to claim 1,
For a refrigerated refrigeration apparatus comprising the resin sheathing that integrally covers and covers at least a part of the stator and a power supply connection body of the motor element and a circuit wiring board to which a control part component for controlling the stator winding is attached. Electric blower. The electric blower for refrigeration equipment according to claim 1, wherein the number of poles of the rotor of the motor element is p, the number of slots is s, the number of blades of the fan is z, and an arbitrary natural number is n.
An electric blower for refrigeration equipment having a configuration in which p ≠ nz or s ≠ nz. The electric blower for refrigeration equipment according to claim 1, wherein the number of rotor poles of the motor element is p, the number of stator slots is s, the number of fan blades is z, and an arbitrary natural number is n.
An electric blower for refrigeration equipment having a configuration in which z ≠ np or z ≠ ns. A refrigerated refrigeration apparatus equipped with the electric blower for the refrigerated refrigeration apparatus according to claim 1.

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