JP2005295788A - Motor fan arrangement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor fan arrangement of which a flame self-extinguishes even if sound absorbing form is ignited. <P>SOLUTION: A motor fan arrangement 10 includes a motor assembly 15 that comprises a rotatable shaft 20, a fan assembly 25 which is connected to the shaft 20 to cause the air flow that passes at least a part of the motor assembly 15. A sound absorbing sleeve 200 having flame self-extinguishing characteristics is at least partially arranged around the motor assembly 15.The sound absorbing sleeve is preferred to comprise V-0 rated foam material. Diffuser/bracket assembly 80/35 of the fan assembly 25 comprises a sound absorbing foam member attached to its curved vane. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention generally relates to motors (motors) or generators. In particular, the present invention uses a motor-fan device, and more particularly a thermally stable sound-absorbing foam that approaches or surrounds the moving part to absorb noise generated by the motor-fan apparatus. The present invention relates to a motor-fan device.

  Motors and generators are well known in the art and are installed for use in a variety of applications. One application is air treatment. In such cases, the motor is connected to a fan to create an air flow or vacuum as required. Often, fans are used to supply cooling air to the motor. In such cases, the fan attached to the shaft driven by the motor draws air into the fan shroud and compresses or pressurizes the air. The pressurized air then releases the air into the motor housing through one or more ports that direct the air across the motor windings and draws heat into the air stream to be discharged from the motor housing. Optionally, the fan shroud can have an exhaust port so that the air flow bypasses the motor windings.

  Known motor assemblies have a tendency to generate noise. Fans typically include vanes having sharp edges. As air flow is generated across these edges and transitions to other guide surfaces, noise is generated. In addition to being undesirable in itself, noise leads to inefficiencies in the air flow, thereby reducing motor performance.

  It is known to use foams for the purpose of extinguishing noise generated by various devices including motors, but such foams are used to prevent the foam from heat degrading. They are always arranged in a spaced relationship with the heat generating element. This makes it difficult to position the foam and requires a configuration in which the device is provided with an additional support structure. The use of foam for the motor's silencing properties also has the problem that it continues to burn when the foam ignites, causing the motor and associated parts to become inoperable. In order to ensure that the motor temperature does not reach the foam ignition temperature, it is required to attach expensive current and / or temperature sensors to the assembly. As soon as such a sensor detects excessive heat or current, the motor is shut down and prevents the foam from igniting. Therefore, there is a need in the art for a motor-fan device that generates low noise that does not suffer from these problems.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a motor-fan apparatus in which a flame does not self-extinguish and continue to burn even when a sound deadening foam is ignited.

  According to one aspect of the present invention, in a motor-fan apparatus, a motor assembly having a rotatable shaft, and coupled to the rotatable shaft, and rotates with the shaft and passes through at least a portion of the motor assembly. A motor-fan apparatus is provided that includes a fan assembly that generates a flowing air flow and a silencer sleeve that is at least partially disposed about the motor assembly.

  According to another aspect of the present invention, in a motor-fan apparatus, a motor assembly having a rotatable shaft, a fan assembly connected to the motor assembly, and a fan end bracket carrying the motor assembly, The fan assembly includes a fan attached to the shaft, the fan end bracket including a bracket opening extending through the fan end bracket and a diffuser coupled to the fan end bracket; The diffuser has an outer peripheral opening through the diffuser, and the rotation of the fan generates an air flow passing through the bracket opening and the outer peripheral opening, and the fan end bracket carries at least one foam piece. By the fan Motor fan unit being characterized in that so as to absorb without the noise is provided.

  For a full understanding of the objectives, techniques, and configurations of the present invention, reference is made to the following detailed description and accompanying drawings.

  FIG. 1 shows a motor-fan device, indicated generally by the reference numeral 10, which generally includes a motor assembly 15 and a fan assembly 25. The motor assembly 15 includes a motor 16 that includes an armature or winding 17, a commutator 18, and a brush (not shown) that makes an electrical connection from the power source to the commutator 18 and the winding 17. ing. The shaft 20 is supported by a suitable bearing and is freely rotatable, connected to the commutator 18, and rotates together with the commutator 18.

  As shown in FIG. 1, the motor assembly 15 is configured such that the commutator 18 is very close to the fan assembly 25. The fan assembly 25 of the motor-fan apparatus 10 includes a fan 26 that is connected to one end 27 of the shaft 20 by a nut and rotates with the shaft 20. The fan assembly 25 further includes a shroud 30 that surrounds the fan 26. As is known in the art, the shroud 30 is provided with an axial hole through which external air is drawn by the fan 26. In the embodiment shown in FIG. 1, the shroud 30 includes an inlet port 31 formed in its cover portion 32 that is centrally located and coaxial with the axis A of the shaft 20. Air is drawn in by the fan 26 and received by a diffuser 80 (discussed in detail below), which distributes the air as required by the end use. A more detailed disclosure of the components of the motor-fan apparatus 10 is provided in US Pat. No. 6,703,754, the contents of which are incorporated herein by reference. The focus is on the advancement of such motor-fan apparatus 10 to more specific elements.

  Referring to FIGS. 1 and 2, the motor assembly 15 is provided with a fan end bracket or bracket assembly, indicated generally by the numeral 35. The fan end bracket 35 is generally adjacent to a flat plate portion 36 (which can be annular as shown) and a motor bracket portion 37 extending from the plate portion 36 toward the motor 16. Bracket opening 75. The motor bracket portion 37 is adapted to support the motor assembly 15. In the present invention, the motor bracket portion 37 is provided with the foam F adjacent to the bracket opening 75 on the inner surface thereof, so that the noise generated by the motor-fan device 10 is reduced. Foam F reduces vibration noise by absorbing the waves generated by the movement of the fan vanes through the air and by relaxing the generated air flow from one direction to the other. In other words, as air is moved by the fan vanes, air is sent by plate portion 36 through opening 75 to bracket portion 37. And, the foam F attached to the bracket portion 37 by bonding or other methods provides a sound absorption air flow transition surface to absorb noise generated by the air flow and prevent further generation of noise. To do.

  Foam F is preferably a V-0 rated form. This form is characterized by having properties determined according to the UL94 standard. That is, this foam is heat resistant and has self-extinguishing flame characteristics. Self-extinguishing flame characteristics mean that when the foam encounters sufficient heat to burn, the initial flame will not be able to continue burning the foam by removing the ignition source. A typical foam has a flash point greater than at least 400 ° C and an auto-ignition temperature greater than at least 580 ° C. A particularly preferred foam is melamine foam, and in a particularly preferred embodiment, Polydamp® melamine foam (PMF; Polymer Technologies, Inc.) is used. PMG has excellent heat resistance and low flammability levels. PMF cannot be dripped even when ignited, and stops burning by removing the ignition source. In fact, the use of such foam eliminates the need to use expensive temperature or current sensors to maintain the motor at the limit temperature. When the motor cannot be maintained at the limit temperature, the foam will ignite.

  The motor-fan device 10 further benefits from the installation of a silencer sleeve 200 in the present invention, as shown in FIG. 1, which is at least partially around at least a portion of the motor assembly 15. And preferably fully installed. The sleeve 200 is made of V-0 rated foam, preferably melamine foam. The sleeve 200 surrounds most of the motor 16 and absorbs and eliminates noise generated by the motor assembly 15 and the fan assembly 25. In fact, the cellular structure helps dissipate the noise frequency generated by the fan assembly, and the foam diverts the noise frequency in a labyrinth manner so that the associated noise frequency is noticeable until the air flow exits the motor assembly. It is to be reduced. The sleeve 200 is attached to the fan assembly 25 at its shroud end 204. The sleeve cover 202 can be placed over the muffler sleeve 200 at the distal end 206 opposite the shroud end 204. The sleeve cover 202 can include a cover hole 208, and in the illustrated embodiment, a portion of the motor assembly can extend through the cover hole 208. If desired, the sleeve can be dimensioned longer than the extended length of the motor assembly as indicated by the sleeve 200 '. The sleeve can be attached by a fastener, clip, adhesive, friction fit, or any other dimension that can hold the sleeve in close proximity to the motor-fan device 10. With the use of a special element, the cover 202, the distal end 206 of the sleeve 200 can be bent inward to form an opening in the sleeve. Accordingly, it will be appreciated that the use of cover 202 is optional. The V-0 rating (V-0 rating) ensures that the foam is not damaged by the heat generated by the operation of the motor 16. Preferably, the sleeve 200 is sized to have a diameter that is not greater than the outer diameter of the shroud 30 as shown, and the sleeve cover 202 or sleeve opening described above can be very close to or in contact with the motor assembly 15. Is preferred. Also, as demonstrated by the sleeve 200 ', the operational efficiency of the motor-fan device is still maintained by using a V-0 rated foam located in contact with or very close to the motor assembly. However, it will be appreciated that it provides the best sound reduction characteristics.

  This foam sleeve concept can also be applied to through-flow motor-fan devices and tangential bypass motor-fan devices. In FIG. 5, the bypass motor-fan apparatus 300 has a shroud 302 of its fan assembly 303, which is covered with a silencer sleeve 304 made of V-0 rated foam. The sleeve cover 306 is opened at a position indicated by reference numeral 308. The sleeve cover 306 is preferably in contact with the shroud 302 as indicated by reference numeral 310. The shroud 302 has a plurality of outer peripheral exhaust ports 311 that exhaust the air flow generated by the fans in the fan assembly 303. As previously mentioned, any conventional means can be used to attach the sleeve to the motor-fan device. The side wall 312 of the sleeve 304 is preferably spaced a small distance from the shroud 302. However, the side walls 312 can contact the shroud 302.

  In FIG. 6, the tangential bypass motor-fan apparatus 400 has a tangential exhaust port 402 extending from the fan assembly 403, which is covered with a silencer sleeve 404 made of V-0 rated foam. ing. The sleeve 404 does not include a sleeve cover and opens at the end 406. Sidewall 412 preferably abuts the outer surface of exhaust port 402 as shown. A plurality of internal flanges 408 can extend from the inner surface of the sleeve, and these internal flanges form a labyrinth flow path 410. The flow path 410 redirects the air flow again, and the flange 408 effectively absorbs and extinguishes noise generated by the motor-fan device 400.

  Additional benefits are realized by using V-0 rated foam in other elements of the motor-fan apparatus 10, particularly the diffuser assembly described below with reference to FIGS. The diffuser 80 (FIG. 1) interacts with the fan end bracket 35 to distribute the air flow generated by the fan 26, and this combination is referred to as the diffuser / bracket assembly. The diffuser / bracket assembly (80/35) is coupled to the motor assembly 15 and rotatably receives the shaft 20. A radial diffuser assembly is shown in FIG. 3 and is generally indicated by reference numeral 80A. The port diffuser assembly is also shown in FIG. 4 and is generally indicated by reference numeral 80B. Both of these diffuser assemblies interact with the fan end assembly 35. The fan 26 draws air through the fan shroud 30 and pushes the air flow out of the air diffuser / bracket assembly. Air from the fan assembly 25 is distributed by these diffuser assemblies 80A and 80B. For general reference, the diffuser is indicated by reference numeral 80 if it can be either radial or port type. And the code | symbol of the special component of these radial type and port type diffuser assemblies is attached with A or B as a suffix.

  The radial diffuser (FIG. 3) includes a flat base member 81 which can be made annular to define a hole 82. The plurality of outer peripheral blades 86 </ b> A surround the fan 26 and serve to guide air outward from the fan side 85. A portion of the air is directed to the outside of the shroud 30 through a plurality of ports 34 (FIG. 1) provided in the shroud 30. A second set of blades 87A formed on the motor side 84 of the radial diffuser 80A guides the remainder of the air radially inward toward the center of the diffuser 80A. These blades 87A can be shaped in any pattern as required by the particular application, and these patterns include spiral or pinwheel patterns as shown. In contrast to the radial diffuser 80A, the port diffuser 80B has an outer peripheral blade 86B on the fan side 105 and an enclosure passage 87B extending from the flat portion 104. These enclosure passages 87B are formed in the same pattern as the blades 86A and 87A of the radial diffuser 80A, and guide the air in and out as described above. The shroud for the port diffuser 80B is completely enclosed.

  The port-type or radial-type diffuser assembly 80 is provided with a pair of brush cap assemblies 95 that contact the brush retainer 120 shown in FIG. In the illustrated embodiment, in the diffusers 80A and 80B, a passage 93 is formed between the pair of upright brush cap members 96 and 97 formed on the motor side (the motor side 84 of the diffuser 80A and the motor side 105 of the diffuser 80B). Is formed. These members 96, 97 are generally disposed adjacent to the central opening 82 and can project into the opening 82 in a predetermined radial range. The port type diffuser brush cap assembly 95 is characterized in that these brush cap assemblies are surrounded by a passage 87B that opposes the blade 87A of the radial type diffuser 80A.

  In the present invention, the diffuser 80 is considered to include the V-0 rated form F as a predetermined element. In particular, the V-0 rated form F is provided on the surface where the air flow collides when the motor-fan device 10 is operated. More specifically, the V-0 rated form F is provided in the blade 87A (radial diffuser) or the surrounding passage 87B (port diffuser). These spiral / pinwheel pattern shaped elements effectively redirect the air flow and are therefore a major contributor to the noise generated by the motor-fan device 10 in general. In particular, the surfaces of the blade 87 </ b> A and the surrounding passage 87 </ b> B bent in the rotation direction of the diffuser 80 are covered with the V-0 rated form F.

  From the foregoing description, it will be appreciated that a new and useful motor-fan apparatus has been disclosed in accordance with the patent law. Various modifications and alternatives can be made to the invention described above without departing from the spirit of the invention, and the claims should be referred to in order to recognize the scope of the invention. Will be understood.

1 is a partial cross-sectional front view of a motor-fan device according to the present invention, showing details thereof; Fig. 2 is a plan view of an end plate according to the present invention, showing in detail the diffuser side of the fan end assembly. 1 is a perspective view of a radial diffuser according to the present invention. It is a perspective view of the port type diffuser by this invention. 1 is a partial cross-sectional plan view of a peripheral bypass motor-fan device according to the present invention. 1 is a partial cross-sectional plan view of a tangential bypass motor-fan device according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Motor fan apparatus 15 Motor assembly 16 Motor 17 Winding 18 Commutator 20 Shaft 25 Fan assembly 26 Fan 27 End of shaft 30 Shroud 31 Inlet port 32 Cover part 35 Fan end bracket 36 Flat board part 37 Motor bracket part 75 Bracket opening 80A Radial diffuser assembly 80B Port diffuser assembly 81 Base member 82 Central opening 84 Motor side 85 Fan side 86A, 87A Blade 86B, 87B Passage 93 Passage 95 Brush cap assembly 96, 97 Upright member 120 Brush retainer 200, 200 'Silencer sleeve 202 Sleeve cover 204 Shroud end 206 Terminal 208 Cover hole 300 Peripheral bypass type motor-fan device 302 Loud 303 Fan assembly 304 Silencing sleeve 306 Sleeve cover 308 Opening portion 310 Abutting portion 311 Outer exhaust port 312 Side wall 400 Tangent bypass motor-fan device 402 Tangent exhaust port 403 Fan assembly 404 Silencing sleeve 406 Open end 408 Internal flange 410 Labyrinth flow Road

Claims (12)

In motor-fan devices,
A motor assembly having a rotatable shaft;
A fan assembly coupled to the shaft for generating an air flow through at least a portion of the motor assembly;
A muffler sleeve disposed at least partially around the motor assembly and having a self-extinguishing flame characteristic;
A motor-fan device comprising:   2. The motor-fan apparatus according to claim 1, wherein the fan assembly has an outer diameter, the muffler sleeve has a sleeve diameter located around the outer diameter of the fan assembly, and the muffler sleeve has a self-extinguishing flame characteristic. A motor-fan device, characterized in that it has a foam material.   2. The motor-fan apparatus according to claim 1, further comprising a sleeve cover attached to the silencer sleeve, the silencer sleeve having a shroud end opposite the distal end forming a sleeve opening, the shroud end. Is attached to the fan assembly, the sleeve cover is attached to the distal end, the sleeve cover has a cover hole extending through the sleeve cover, and the motor assembly extends through the cover hole. A motor-fan device characterized.   The motor-fan apparatus according to claim 1, wherein the muffler sleeve contacts the motor assembly, the muffler sleeve has a shroud end opposite the distal end, and the shroud end is attached to the fan assembly, A motor-fan apparatus, wherein a distal end is bent inwardly to form a sleeve opening, the motor assembly extends through the sleeve opening, and the distal end contacts the motor assembly. The motor-fan apparatus according to claim 1, wherein
The fan assembly includes a fan attached to the shaft, a diffuser / bracket assembly coupled to the motor assembly for rotatably receiving the shaft, and a fan shroud attached to the diffuser / bracket assembly. And the rotation of the fan draws air through the fan shroud and out of the diffuser / bracket assembly, the diffuser / bracket assembly being attached to the diffuser / bracket assembly and flowing through the diffuser / bracket assembly. Having at least one foam piece that reduces air noise,
The diffuser / bracket assembly includes a fan end bracket having at least one motor bracket for carrying the motor assembly, and a diffuser coupled to the fan end bracket, and the fan end bracket is a flat plate. And the flat plate has a bracket opening extending through the flat plate adjacent to the at least one motor bracket, and the at least one foam piece is adjacent to the bracket opening. The motor-fan apparatus is attached to a motor bracket of the motor. The motor-fan apparatus according to claim 1, wherein
The fan assembly includes a fan attached to the shaft, a diffuser / bracket assembly coupled to the motor assembly for rotatably receiving the shaft, and a fan shroud attached to the diffuser / bracket assembly. And the rotation of the fan draws air through the fan shroud and out of the diffuser / bracket assembly, the diffuser / bracket assembly being attached to the diffuser / bracket assembly and flowing through the diffuser / bracket assembly. Having at least one foam piece that reduces air noise,
The diffuser / bracket assembly includes a fan end bracket having at least one motor bracket carrying the motor assembly, and a diffuser coupled to the fan end bracket, and the fan end bracket includes the fan end bracket. A motor opening penetrating the bracket, the diffuser having a plurality of outer peripheral openings penetrating the diffuser and a plurality of blades extending from one side of the diffuser toward the fan end bracket; One foam piece is attached to at least one of the plurality of blades to absorb noise, the blade is curved and forms a concave surface, and the foam piece is attached to the concave surface That is characterized by Data - the fan unit. The motor-fan apparatus according to claim 1, wherein
The fan assembly includes a fan attached to the shaft, a diffuser / bracket assembly coupled to the motor assembly for rotatably receiving the shaft, and a fan shroud attached to the diffuser / bracket assembly. And the rotation of the fan draws air through the fan shroud and out of the diffuser / bracket assembly, the diffuser / bracket assembly being attached to the diffuser / bracket assembly and flowing through the diffuser / bracket assembly. Having at least one foam piece that reduces air noise,
The diffuser / bracket assembly includes a fan end bracket having at least one motor bracket carrying the motor assembly, and a diffuser coupled to the fan end bracket, and the fan end bracket includes the fan end bracket. A motor opening penetrating the bracket, wherein the diffuser has a plurality of passages extending from one side of the diffuser toward the fan end bracket, and the at least one foam piece is disposed in the plurality of passages. A motor-fan device which is attached to at least one to absorb noise.   A motor fan device includes a motor assembly having a rotatable shaft, a fan assembly coupled to the motor assembly, and a fan end bracket carrying the motor assembly, the fan assembly being attached to the shaft. The fan end bracket includes a bracket opening penetrating the fan end bracket and a diffuser coupled to the fan end bracket, and the diffuser has an outer peripheral opening penetrating the diffuser. The rotation of the fan generates an air flow passing through the bracket opening and the outer peripheral opening, and the fan end bracket supports at least one foam piece to absorb noise generated by the fan. Fan unit - motor according to claim.   9. The motor-fan apparatus of claim 8, further comprising a silencer sleeve disposed at least partially around the motor assembly, wherein the fan end bracket includes at least one motor bracket carrying the motor assembly. The bracket opening is adjacent to the at least one motor bracket, the at least one motor bracket has a silencer foam attached to the motor bracket, and the diffuser directs air flow from the fan to the motor. A motor-fan apparatus comprising a plurality of curvilinear blades directed toward the assembly, the curvilinear blades having a sound deadening foam attached to the curvilinear blades.   9. The motor-fan apparatus according to claim 8, further comprising a silencer sleeve disposed at least partially around the motor assembly, wherein the silencer sleeve and the at least one foam piece have self-extinguishing flame characteristics. A motor-fan device comprising:   9. The motor-fan apparatus of claim 8, further comprising a silencer sleeve disposed about the fan assembly, wherein the fan assembly includes a fan shroud having a plurality of exhaust ports, A motor-fan device, characterized in that it is arranged very close to the exhaust port.   9. The motor-fan apparatus of claim 8, further comprising a muffler sleeve having at least one internal flange forming a labyrinth flow path, wherein the fan assembly includes a fan shroud having a tangential exhaust port, and the muffler A motor-fan apparatus, wherein a sleeve is attached to the tangential exhaust port.

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