1. Field
This relates to an air conditioner, and particularly to an air conditioner with a shroud having reduced vibration and noise levels.
2. Background
Air conditioners are air conditioning devices that keep indoor air fresh so that a prescribed space is appropriate for humans to live in. An air conditioner absorbs or discharges heat in a prescribed space to keep moisture and temperature at a constant level in the space. In order to accomplish this, such an air conditioner may include an outdoor unit to discharge the heat it has absorbed from the space during operation to the outside, or to absorb heat from the outside.
For efficient heat exchange between the outdoor unit and the outside, the air in the outdoor unit is exchanged with outdoor air so that a prescribed difference in temperature may be maintained between the heat exchanger in the outdoor unit and the air in the outdoor unit. For this, the air in the outdoor unit may be discharged to the outside and subjected to circulation. This operation may be accomplished by a blower fan provided at the outdoor unit.
Rotation of the blower fan causes the flow of air. Such air flow is guided to the outside by a shroud. While the air flow is guided by the shroud, vibration or noise of the shroud occurs due to the air flow. Such vibration or noise becomes large, especially at a rear part of the fan blade(s), where the air flow is more violent. A rear part of a shroud is positioned above the rear part of the blade(s), and thus making it difficult to remove vibration or noise of the shroud as well as to effectively guide the air flow to the outside.
A difference in pressure, which occurs while the blower fan rotates, causes air to flow to the outside of the outdoor unit. Outer air enters into the outdoor unit to replace the discharged air, and this leads to circulation of air between inside and outside of the outdoor unit. In the middle of the air circulation, effective heat exchange is done in the outdoor unit. While the blower fan operates to create air flow, the air is affected by various members in the outdoor unit to increase the noise and vibration. And, the discharged air may become turbulent so that energy used for discharging the air produces a vortex that has nothing to do with air discharge, or causes inner circulation which lowers energy efficiency.
The embodiments will be described in detail with reference to the following drawings in which like reference numerals refer to like elements wherein:
A shroud may be arranged at a front side of a blower fan to smoothly guide air discharged by a difference in pressure created from rotation of the blower fan.
Such a shroud may have a different degree of effectiveness solving the vibration, noise, efficiency, and the like, problems discussed above depending on its shape. In particular, if the shape is incorrectly designed, resonance may occur between the shroud and the discharged air, which may increase vibration and noise, and lower energy efficiency. Accordingly, an effectively designed shroud becomes a critical factor for improvement in capacity of the outdoor unit.
Referring to
The cabinet 120 includes a front plate 122 which functions as the front surface, a base 123 located at the bottom side of the front plate 122 to support various devices, a cabinet body 124 located at the upper side of the base 123 to be coupled with the front plate 122, and a top plate 121 at the top side of the cabinet body 124 to be coupled with the front plate 122. The cabinet body 124 includes a first air inlet (not shown) through which outer air is entered/exited, and a first grill 170 for removing unwanted materials included in the air that is entered/exited through the first air inlet. Further, the cabinet body 124 includes a second air inlet (not shown) through which outer air is entered/exited, and a second grill (not shown) for removing unwanted materials included in the air that is entered/exited through the second air inlet.
The blower fan assembly 180 includes a blower fan 140 that receives a rotational force from the motor 150 to make inner air flow to the outside, and a shroud 130 that guides the air flowing due to the blower fan 140 to the outside.
Referring to
The motor 150 rotates at a high speed, and thus this leads to vibration and/or noise. A motor supporting structure 151 is arranged under the motor 150 to fix the motor 150. Condensed water generated from the first heat exchanger 161 and the second heat exchanger 162 is drained in a side direction through a drain pan 163 that is elongated in the left and right direction.
Referring to
In the second shroud 133, the outer peripheral surface of its transverse section may have various shapes. For example, the outer peripheral surface of the transverse section may be shaped as a circle. Or, the outer peripheral surface of the transverse section may be shaped as an ellipse. If the second shroud 133 is shaped as an ellipse or a circle, the unstable air collides with the second shroud 133 so that its flow is changed to have a uniform form. As a result, the unstable air is stabilized to reduce the noise and/or vibration.
Meanwhile, the rearmost part, or trailing edge, of the blade 141 may be arranged between the incoming and outgoing ends, or inlet and outlet, of the second shroud 133. The air flowing through the shroud 130 collides with the rearmost part of the blade 141 to disturb the air flow. Consequently, the air flow becomes unstable at the trailing edge of the blade 141. The unstable air flow may be stabilized by having the rearmost part of the blade 141 arranged between the front end and rear end of the second shroud 133. That is, the unstable air flow created at the rearmost part of the blade 141 comes to collide with the second shroud 133 rapidly because the space between the second shroud 133 and the blade 141 is narrow. The air is discharged to the outside along with the air flowing through the blower fan 140. Accordingly, the air flow may be stabilized without being unstable.
The shroud 130 may be formed so that the first shroud 131 may be integrated with the second shroud 133, and further include a coupling unit 132 that couples the first shroud 131 with the second shroud 133 and a connecting part 134 that couples the shroud 130 with the cabinet 120. The coupling unit 132 may be formed so that a portion thereof between the first shroud 131 and the second shroud 133 is curved. The air flow created by rotation of the blower fan 140 is discharged from the second shroud 133 through the first shroud 131 to the outside. The air stabilized in the second shroud 133 flows into the first shroud 131, and at this time the air may be unstable unless the coupling unit 132 is curved. The coupling unit 132 forms a curved line with the first shroud 133 and the second shroud 133. Since the coupling unit 132 is coupled with the first shroud 131 and the second shroud 133 to form a curved line, the air may be discharged to the outside with its flow stabilized. Such stabilized air flow may reduce energy utilized by the motor 150. Also, the stabilized air flow may facilitate the air flow and effectively discharge the heat exchanged air to the outside of the outdoor unit 100.
Referring to
The guide member 235 may be shaped as a tetragon to be coupled with the cabinet 120. If the guide member 235 is shaped as a tetragon, each of its edges may be rounded to remove noise and vibration that may be created by air flow. The guide member 235 is shaped as a tetragon to be capable of being easily coupled with the cabinet 120. The air flow created upon rotation of the blower fan 140 is discharged to the outside of the cabinet 120. The air passes through the heat exchangers 161 and 162 and then flows into the guide member 235. The air in the guide member 235 is guided to a first shroud 231 coupled to the second shroud 233 by a coupling unit 232. Accordingly, the internal air flowing through the guide member 235 may be effectively guided to the shroud 130.
Referring to
Meanwhile, the unstable air flow is eliminated or stabilized thanks to the air storage member 336. Unstable air flow is trapped by the air storage part 337 as it flows beyond the air storage member 336. The unstable air flow may be stabilized by being trapped in the air storage part 337. Accordingly, it may be possible to effectively reduce or eliminate the vibration or noise created by the unstable air flow.
Referring to
The amplitude of the upper and lower vibration (f) of the guide member 435 increases as it progresses to the end of the guide member 435, and thus the reinforcement plates 432 may support the end of the guide member 435 and the first shroud 431 to reduce the vibration. And, an outermost edge 435d of the guide member 435 is spaced furthest from the center of the shroud 430 as seen from the drawings, and thus the largest vibration is created near the edge 435d. Therefore, the reinforcement plates 432 may include a first reinforcement plate 432a that supports the outermost end 435d of the guide member 435 and the first shroud 431, and a second reinforcement plate 432b that supports a more narrow portion of the guide member 435. And, since it may be effective to form the reinforcement plate 432 together with the shroud 430 in terms of work efficiency, the reinforcement plate 432 may be arranged at the shroud 430 to support all of the guide member 435, the second shroud 434, and the first shroud 431.
As air is discharged through the first shroud 431 as the blower fan 140 rotates, the pressure of the discharged air is varied periodically, and such variation in pressure leads to vibration (in the direction of arrow g) toward the center of the first shroud 431. Such vibration (g) becomes a source of noise and fatigue of the first shroud 431. In order to reduce this vibration, a reinforcement ring 433 is arranged at the first shroud 431 to surround the circumference of the first shroud 431 to reinforce the first shroud 431 and reduce the center-oriented vibration (g) of the first shroud 431.
As shown in
The graph S1 shows the magnitude of noise generated per rotation number of the blower fan in a shroud that does not include a reinforcement plate 432, reinforcement ring 433, the reinforcement rib 437 shown in the exemplary embodiments. The graph S2 shows the magnitude of noise generated per rotation number of the blower fan in a shroud that includes the reinforcement plate 432, the reinforcement ring 433, and the reinforcement rib 437 shown in the exemplary embodiments so that its strength has been reinforced. As shown in
An air conditioner is provided that may reduce noise generated in a blade of a blower fan due to air flow.
An air conditioner is provided that may lower vibration and noise as well as increase energy efficiency.
An air conditioner embodied and broadly described herein may include a blower fan that creates flow of air; a first shroud that guides the air flowed by the blower fan to the outside; and a second shroud provided behind the first shroud, the outer peripheral surface of a transverse section of the second shroud being formed to be curved so as to stabilize air flow created behind the blower fan.
The second shroud may stabilize air flow, and this may reduce vibration of the shroud that occurs due to air flow at the rear part of the blade. Also, this may solve noise problem caused by the vibration of the shroud.
An air conditioner as embodied and broadly described herein may provide smooth guiding of the flow of air discharged upon rotation of the blower fan to increase energy efficiency.
An air conditioner as embodied and broadly described herein may reinforce the intensity of the shroud without any increase in weight of the shroud to increase life span of the outdoor unit for the air conditioner.
An air conditioner as embodied and broadly described herein may minimize resonance between the air discharged by the blower fan and the shroud as well as the amplitude of vibration of the shroud itself to reduce the vibration and noise.
Any reference in this specification to “one embodiment,” “an embodiment,” “example embodiment,” etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment as broadly described herein. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments.
Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, numerous variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.
Number | Date | Country | Kind |
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10-2008-0009713 | Jan 2008 | KR | national |
10-2008-0011798 | Feb 2008 | KR | national |