JP5604944B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner having an air passage through which air-conditioned air flows and in which an air outlet from which the air-conditioned air is blown is formed, and is particularly used for a vehicle air-conditioner. Is preferred.

  Conventionally, in Patent Document 1, an outer cylinder part and an inner cylinder part formed inside the outer cylinder part are provided in an air conditioning duct connected to the downstream side of the air flow path of the vehicle air conditioner. Describes a technique in which a hollow side branch type sound deadening chamber is defined by the inner peripheral surface of the inner portion and the outer peripheral surface of the inner cylindrical portion.

  Patent Document 2 describes an automobile air conditioning unit in which a circular hole is formed in an outer wall of a channel forming an air passage, and a sound absorbing part is attached to the outside of the outer wall.

  Further, in Patent Document 3, a first sound absorbing member that attenuates vibration energy is provided on an opposing surface that forms a bent portion of an air conditioning duct, and an air conditioning duct that reflects incident waves to the first sound absorbing member is also opposed. A technique for providing a second sound absorbing member for attenuating vibration energy in the region is described.

JP 2008-265717 A JP 2007-84061 A JP 2007-263466 A

  In the prior art of Patent Document 1, the wavelength of the sound that can be silenced in the side branch type silencing chamber is four times the axial length of the silencing chamber, but when it is desired to reduce the sound pressure level having a low frequency range, One wavelength becomes longer. For this reason, there is a problem that the length of the silencer chamber in the axial direction also increases and the apparatus becomes larger. For example, a sound having a high sound pressure level in a car or the like and having a frequency of 500 Hz has a wavelength of 680 mm, and thus the axial length of the muffler chamber is as large as 170 mm. Further, since the side branch type silencing chamber is formed in the vicinity of the inner wall surface of the duct, the sound in the vicinity of the duct wall surface can be silenced, but the effect of lowering the sound pressure level of the entire flow path is small.

  Moreover, in the prior art of patent document 2, since it is a structure where a sound absorption component is attached to the outer side of an air passage, there exists a problem that the physique of an air conditioning unit becomes large.

  In the prior art of Patent Document 3, noise level can be reduced in the frequency band of 1600 Hz to 6300 Hz, but no significant reduction effect is seen for noise in a frequency band smaller than this.

  Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide an air conditioner that can reduce aerodynamic noise without increasing the size of the apparatus.

In order to achieve the above object, the following technical means are adopted. That is, in the invention according to the air conditioner of the first aspect, the conditioned air is blown out from the case (2) in which a passage through which the conditioned air toward the room flows is formed inside and the indoor outlet (22) exposed to the room. As described above, the duct (19) connecting the case outlet (12) formed in the case and the indoor outlet (22) is spaced from the inner wall surface (19a) of the duct downstream of the case outlet. A noise reduction member (31) that forms a passage (30a, 30b) between both surfaces of the plate-like member and the inner wall surface of the duct. A hairy surface portion (311) covered with hair is provided on at least one surface of both surfaces of the plate-like member,
The inner wall surface (19a) of the duct facing the surface on which the hairy surface portion is provided with a space therebetween forms a passage that is not a bent portion,
The surface on which the hairy surface portion is provided is provided along the flow direction of the conditioned air in a passage that is not a bent portion ,
Silencing member has higher frame portion rigidity than the hairy surface of (312, 332), the frame portion you supports the outer peripheral edge portion of the hairy surface portion has an opening for exposing the hairy surface on the passage It is characterized by that.

  The inventor of the present application performs numerical analysis using a commercially available general-purpose fluid analysis software on a formula based on Powell's theory, which is generally known as an aerodynamic noise generation concept, in an indoor air conditioning unit to which a duct is connected. The distribution of the Powell sound source term was determined for the fluid flowing through the inside of the unit and the inside of the duct. Powell's theory is that not only pressure fluctuations on the surface of an object but also deformation and expansion / contraction of vortices existing in a flow field in space become noise sources. And in this numerical analysis, using the outer product of the vorticity vector and the flow velocity vector, it represents a wave equation that correlates the flow and aerodynamic noise, and for this wave equation, the outer product at each position is differentiated by space and time, Calculate the value of the Powell sound source term. By visualizing the flow inside the indoor air conditioning unit and inside the duct based on this calculation result, the inventor can make the value of the Powell sound source term larger inside the duct than inside the indoor air conditioning unit (inside the case). Recognize. Therefore, the inventor has found that the disturbance of the fluid flow is promoted inside the duct rather than inside the indoor air conditioning unit, and the disturbance greatly contributes to noise. In addition, so-called aerodynamic noise is sound generated in the process in which wind hits an object and creates a vortex behind it, that is, noise generated by the movement of airflow.

Therefore, according to the present invention, the plate-like silencing member is provided at a distance from the inner wall surface of the duct in the passage in the duct connecting the case outlet and the indoor outlet, and at least one surface of the silencing member A hairy surface portion whose surface is covered with hair is formed. This silencing member suppresses the formation of an air shear layer at the boundary between the hair surface and the air by the hair covering the surface when the air flows along the hair surface. For this reason, as described above, since the air flowing in the duct having a large flow disturbance is suppressed by the hairy surface portion on at least one of the two surfaces of the silencer member, aerodynamic noise can be reduced. Therefore, it is possible to provide an air conditioner that can reduce aerodynamic noise without increasing the size of the apparatus.
In addition, according to the present invention, since the hair surface portion that is relatively soft is reliably supported by the frame portion having high rigidity, the hair surface portion can be installed in a stable state, and the conditioned air is applied to the hair surface portion. It is possible to provide a stable structure. Therefore, a silencing member that can continuously exhibit a desired silencing function is obtained.

According to the air conditioner of the second aspect of the present invention , the conditioned air is blown out from the case (2) in which a passage through which the conditioned air flows toward the room is formed and the indoor air outlet (22) exposed to the room. The duct (19) connecting the case air outlet (12) formed in the case and the indoor air outlet (22) and the inner wall surface (19a) of the duct downstream from the case air outlet are spaced apart from each other. A silencing member (31) that forms a passage (30a, 30b) between both surfaces of the platy member and the inner wall surface of the duct, and the silencing member (31) The duct (18) is provided with a hair-like surface portion (311) covered with hair on at least one surface of both sides of the plate-like member, and further connects the indoor air outlet (21) and the case air outlet (11). ) Multiple doors (1 A, 60), the plurality of doors are arranged at intervals in the flow direction of the conditioned air, and at least one of the doors is formed with a plurality of through holes (151) penetrating the door plate. It is characterized by that.

  According to this invention, the closed space can be formed in the passage in the duct by the plurality of door plates arranged on the upstream side and the downstream side in the flow direction of the conditioned air, and the through holes formed in the door plate are further provided. A communication path that connects the closed space and the outside is formed. With this configuration, a perforated resonance silencer using a door can be constructed inside the duct connecting the case outlet and the indoor outlet. Therefore, the closed space functions as a resonance box, and noise that propagates from the upstream case can be reduced.

According to claim 3 , the muffling member (33) is a door plate that opens and closes the passage in the duct (19) downstream of the case outlet, and a hair-like surface portion is provided on at least one surface of the door plate. Is formed. According to the present invention, since the door that opens and closes the passage in the duct can also serve as a silencing member, a door mechanism having both an air volume adjusting function and a silencing function can be configured. Therefore, it is not necessary to separately provide a member having a hairy surface portion, and an indoor air conditioning unit that can reduce the mounting space and achieve a simple configuration can be provided.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the hair-like surface portions are provided on both surfaces of the plate-like member. According to the present invention, the air flowing in the duct having a large turbulence in flow is restrained by the hairy surface portions on both sides of the sound deadening member, so that the effect of further reducing the turbulence in flow is obtained, and further aerodynamic noise is obtained. The reduction effect can be expected.

According to the fifth aspect of the present invention, the room from which the conditioned air is blown out is an automobile room, and the case outlet (12) is a face outlet. According to this invention, the noise-reducing member of each of the above inventions can effectively reduce the noise level in a low frequency region that can be a problem in an automobile. Further, by applying the invention according to any one of claims 1 to 4 to an air conditioner for an automobile, the indoor air conditioner is installed in a mounting place where space is limited such as a rear side of the automobile instrument panel and a side trim. This is useful because it can be installed without increasing the size of the unit.

  In addition, the code | symbol in the bracket | parenthesis of each said means is an example which shows a corresponding relationship with the specific means of embodiment mentioned later.

It is sectional drawing explaining the structure of the indoor air conditioning unit of the vehicle air conditioner which concerns on 1st Embodiment to which this invention is applied. It is a fragmentary sectional view which shows a state when the II-II cut surface in FIG. 1 is seen by the arrow. It is a perspective view which shows the muffling member in the duct for the face blowing by the side of a driver's seat. It is a side view which shows the hairy surface part of a sound deadening member. It is an arrow view of the V direction in FIG. It is a perspective view which shows the support part for supporting the hair-like surface part of the noise reduction member in a noise reduction apparatus. It is sectional drawing which shows the muffling member in the duct for the face blowing on the passenger seat side. It is sectional drawing which shows the silencer for the face blowing which concerns on 2nd Embodiment to which this invention is applied. In FIG. 8, it is sectional drawing which shows the silencing mechanism by the side of a passenger seat. It is sectional drawing explaining the structure of the indoor air conditioning unit of the vehicle air conditioner which concerns on 3rd Embodiment to which this invention is applied.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration. Not only combinations of parts that clearly indicate that each embodiment can be specifically combined, but also combinations of the embodiments even if they are not clearly indicated unless there is a problem with the combination. Is also possible.

(First embodiment)
A first embodiment to which an air conditioner of the present invention is applied will be described with reference to FIGS. FIG. 1 is a cross-sectional view illustrating the configuration of an indoor air conditioning unit 1 in the vehicle air conditioner of the first embodiment. In FIG. 1, the upper side of the page indicates the upper side of the vehicle, the lower side indicates the lower side of the vehicle, the left direction indicates the front side of the vehicle, and the right direction indicates the rear side of the vehicle.

  The indoor air-conditioning unit 1 has an outer shell formed of a case 2 and roughly includes a blower unit and an air-conditioning unit. The case 2 is disposed on the back side of the instrument panel 24 in front of the vehicle interior. The case 2 includes a plurality of case members, and is a resin molded product such as polypropylene. The plurality of case members are integrally connected by fastening means such as metal springs and screws to form the case 2.

  Furthermore, the indoor air-conditioning unit 1 is a device that supplies air temperature-adjusted from the left and right outlets toward the vehicle interior, so that the air-conditioning setting can be varied independently on the driver's seat side and the passenger seat side. Realize temperature control. An intermediate partition plate (not shown) is provided inside the case 2 of the indoor air-conditioning unit 1 so as not to mix the left and right separately ventilated air. It is divided into two ventilation paths.

  The blower unit includes a blower (not shown) for blowing air inside or outside the vehicle compartment to the air conditioning unit, and the blower outlet of the blower is connected to the blower passage 3 leading to the inlet of the air conditioning unit. The blower includes a centrifugal multiblade fan and a motor for driving the fan. The periphery of the centrifugal multiblade fan is surrounded by a scroll casing, and communicates with the blower passage by a duct extending in the centrifugal direction of the centrifugal multiblade fan.

  The air-conditioning unit includes an evaporator 4 that is provided so as to cross the entire air passage 3, a heater core 8 that heats air that has passed through the evaporator 4, a cold air passage 5, two air mix doors 6 and 7, The case 2 includes a hot air passage 9, an air mix chamber 10 in a space where hot air and cold air are mixed, a defroster door 15, a face door 16, and a foot door 17. Further, the case 2 is formed with a plurality of air outlets on the downstream side of the cold air passage 5 and the hot air passage 9. Here, the defroster air outlet 11, the face air outlet 12, and the foot are examples of the case air outlet. Air outlets (first foot air outlet 13 and second foot air outlet 14) are provided.

  The defroster outlet 11 is located in the upper part of the case 2 on the vehicle front side. A defroster indoor air outlet 21, which is one of the indoor air outlets, is provided in the front part of the vehicle near the front window glass 23 of the instrument panel 24. The defroster air outlet 11 and the defroster indoor air outlet 21 are connected by a defroster duct 18 so that the conditioned air follows the indoor side surface of the front window glass 23 and the like in order to reduce the degree of fogging. The defroster outlet 11 is controlled to open and close by a defroster door 15.

  The face outlet 12 is located on the vehicle rear side of the defroster outlet 11 at the top of the case 2. On the front surface of the instrument panel 24 on the vehicle rear side, a face indoor air outlet 22 which is one of the indoor air outlets exposed in the vehicle interior is provided. The face air outlet 12 and the face indoor air outlet 22 are connected to each other by a face duct 19 in order to blow air-conditioned air toward the upper body of the driver and passenger seat passengers. The face outlet 12 is controlled to open and close by a face door 16.

  The foot outlets 13 and 14 are located on the vehicle rear side below the case 2. A foot indoor air outlet (not shown), which is one of the indoor air outlets, is provided at the foot of the passenger. The foot air outlets 13 and 14 and the face indoor air outlet 22 are connected by a foot duct 20 in order to blow air-conditioned air toward the feet of the passengers in the driver seat and the passenger seat. The opening and closing of the foot outlets 13 and 14 are controlled by a foot door 17. When the first foot outlet 13 is opened by the foot door 17, the air heated by the heater core 8 flows through the passage in the foot duct 20, and the second foot outlet 14 is opened. In this case, the air cooled by the evaporator 4 flows through the passage in the foot duct 20.

  The air outlets 11, 12, 13, and 14 are bilaterally symmetric about a passage partition wall that bisects the inside of the case 2 in the left-right direction of the vehicle. It is arranged so that it can be supplied. In addition, the conditioned air blown from each outlet is supplied to a predetermined indoor blowing portion in the passenger compartment through the connected ducts 18, 19, 20. Each of the defroster door 15, the face door 16, and the foot door 17 is a one-side pivot type plate door having a rotation shaft and a flat door plate extending to the other side of the rotation shaft. The operations of the blower, the air mix doors 6 and 7, the defroster door 15, the face door 16 and the foot door 17 are controlled by a control device (not shown).

  The evaporator 4 is, for example, a cooling heat exchanger that is located on the vehicle front side of the case 2 and that evaporates a low-temperature and low-pressure refrigerant decompressed by an expansion valve in the refrigeration cycle by receiving air from the blower. And the blowing air which passes the circumference | surroundings of the tube through which a refrigerant | coolant flows is cooled, and cold wind is supplied to the downstream cold wind channel | path 5. FIG. The heater core 8 is a heat exchanger for heating that is located at a lower part on the vehicle rear side than the evaporator 4 and heat-exchanges with the blown air by using the high-temperature cooling water of the traveling engine as a heat source, and heats the air that flows around it. It arrange | positions so that the channel | path downstream from the evaporator 4 in the air flow direction may be partially blocked.

  The air mix door 6 is a door that is located on the vehicle rear side with respect to the evaporator 4 and that can open and close the cold air passage 5 that is a downstream passage through which the air that has passed through the evaporator 4 flows down. The air mix door 7 is located on the vehicle rear side of the evaporator 4, opens and closes a passage below the air mix door 6, and opens and closes the cool air passage 5 and the hot air passage 9 through which the air passing through the evaporator 4 flows down. It is a door that can.

  The air mix doors 6 and 7 adjust the temperature of the conditioned air by adjusting the ratio between the amount of warm air passing through the heater core 8 and the amount of cool air not passing through the heater core 8 depending on the opening position. When the air mix doors 6 and 7 are at the positions indicated by the solid lines in FIG. 1, it is during maximum cooling, the hot air passage 9 is closed to completely shut off the air flow to the heater core 8 and cool the vehicle interior. Provide wind. The state shown in FIG. 1 is when the face blowing mode is set, and the air mix doors 6 and 7, the defroster door 15, the face door 16, and the foot door 17 are also open positions at which the mode is performed. Is set to

  Conversely, when the air mix door 6 is in the position indicated by the two-dot chain line in FIG. 1, it is during maximum heating, and all the air that has passed through the evaporator 4 by closing the cool air passage 5 leading to the air mix chamber 10 is sent to the heater core 8. Heat and flow to provide heating air to the passenger compartment.

  Further, when the air mix doors 6 and 7 are in the intermediate positions, both the cold air passage 5 and the hot air passage 9 are partially opened so that both the cold air and the hot air flow down, It mixes with the air mix chamber 10 provided in the upstream of the blower outlets 11-14, is blown from the blower outlet opened after temperature control, passes through the inside of a duct, and is sent to an indoor blower outlet.

  The warm air passage 9 is inclined to the front side of the vehicle and is formed to extend from the lower portion of the case 2 toward the upper air mix chamber 10. The warm air passage 9 has a width dimension in the entire vehicle left-right direction of the case 2, and the width dimension is larger than the dimension in the vehicle front-rear direction. That is, the hot air passage 9 is a flat passage that is thin in the front-rear direction, is horizontally long, and is long in the up-down direction.

  The face air outlet 12 and the defroster air outlet 11 are openings facing the air mix chamber 10. The first foot outlet 13 is an opening facing the warm air passage 9. The second foot outlet 14 is an opening through which a cold air that does not pass through the heater core 8 is blown from the downstream side of the evaporator 4, facing a passage extending to a position below the heater core 8. Therefore, when the foot door 17 is in the position indicated by the solid line in FIG. 1, the first foot outlet 13 is closed and the cool air is blown out from the second foot outlet 14. When the foot door 17 is at the position indicated by the two-dot chain line in FIG. 1, the second foot outlet 14 is closed and hot air is blown out from the first foot outlet 13.

  The air conditioner according to the present invention includes a silencer having a plate-like silencer member provided on the downstream side of the case outlet and spaced from the inner wall surface of the duct. That is, a passage is formed between both surfaces of the silencer member and the inner wall surface of the duct. As described in the section of the means for solving the above problems, the silencer can reduce aerodynamic noise due to a large fluid flow turbulence inside the duct than inside the indoor air conditioning unit found by the inventor. .

  Below, the silencer 30 provided on the downstream side of the face outlet 12 as a representative of the case outlet will be described. FIG. 2 is a partial cross-sectional view showing a state when the II-II cut surface in FIG. FIG. 3 is a perspective view showing the muffling member 31 in the duct for blowing out the face on the driver's seat side. As shown in FIG. 2, the silencer 30 is a cylindrical device that connects between the face outlet 12 of the case 2 and the face duct 19, and is connected to both ends of the passage extending direction. The flange portion and a plurality of connection holes are formed.

  The passage on the downstream side of the face outlet 12 is divided into a driver seat side passage and a passenger seat side passage that are symmetrical to each other by a central partition wall 34 that bisects the interior of the silencer 30 in the vehicle left-right direction. The driver-seat-side passage and the passenger-seat-side passage constitute a passage that can supply conditioned air to both the left and right sides of the driver-seat side and the passenger-seat side, and each passage is further laterally defined by left and right partition walls 322 and 35 It is divided into a center passage and a side passage.

  The center passage is provided as a center passage on the driver's seat side and a center passage on the passenger seat side one by one symmetrically at the center in the left-right direction of the cylindrical body constituting the silencer 30, and there are a total of two passages. The center passage on the driver's seat side and the center passage on the passenger seat side are respectively provided on the front side of the instrument panel 24 on the vehicle rear side of the instrument panel 24 by independent face ducts 19 respectively. It is connected to a face indoor outlet 22 corresponding to the center outlet.

  The side passage is provided as a side passage on the driver's seat side and a side passage on the passenger seat side one by one in the left-right direction at both ends of the cylindrical body constituting the silencer 30, and the center passage and the assistant on the driver seat side. A total of two passages arranged so as to sandwich the seat side center passage. The side passage on the driver's seat side and the side passage on the passenger seat side are respectively provided on the driver seat side and the left and right ends on the front side of the vehicle rear side of the instrument panel 24 by separate face ducts 19. It is connected to a face indoor air outlet 22 corresponding to each side air outlet on the passenger seat side. The conditioned air blown out from the side air outlets on the driver seat side and the passenger seat side mainly flows along the inner surfaces of the doors on the driver seat side and the passenger seat side.

  The central partition wall 34, the right partition wall 322, and the left partition wall 35 are configured by walls that are bridged in the short width direction that divide the horizontally long face outlet 12 into a plurality of openings in the width direction. The central partition wall 34 is provided so as to cut through the central portion of the face outlet 12. The right partition wall 322 is provided so as to cut through the face air outlet 12 at a position on the driver's seat side that is spaced from the central partition wall 34 by the width of the center passage on the driver's seat side. The left partition wall 35 is provided so as to longitudinally cut the face outlet 12 at a position on the passenger seat side that is spaced from the central partition wall 34 by the width of the center passage on the passenger seat side.

  A silencer 31 is provided in each of the center passage and the side passage on the driver's seat side. Paths 30a and 30b are formed between both surfaces of the sound deadening member 31 that is a plate-like member and the inner wall surface 19a of the duct of the cylindrical body (corresponding to the inner wall surface of the duct of the present invention) (FIG. 1). And FIG. 3). Therefore, the passage on the driver's seat side inside the cylindrical body constituting the silencer 30 is divided into four passages by the two left and right silencer members 31 and the right partition wall 322.

  As shown in FIGS. 2, 3, and 6, each silencing member 31 has a shape corresponding to the outer shape of the hair-like surface portion 311 and the hair-like surface portion 311 whose surface is covered with hair on one or both surfaces. A frame portion 312 that forms an opening and surrounds the periphery of the hairy surface portion 311; a plurality of claw portions 313 that are provided on both sides of the inner peripheral edge portion 312a of the frame portion 312 and support the outer peripheral edge portion of the hairy surface portion 311; , And is configured. The plate-like hairy surface portion 311 is fitted into the opening surrounded by the inner peripheral edge portion 312a of the frame portion 312, and the position in the direction parallel to the frame portion 312 is regulated by the inner peripheral edge portion 312a. The outer peripheral end portions of both surfaces are sandwiched by the portion 313, and the position in the direction perpendicular to the frame portion 312 is regulated, thereby being held.

  The silencing member 32 constitutes the silencing member similar to the silencing member 31, and has a hair surface portion 321 whose surface is covered with hair on one or both surfaces, and an opening having a shape corresponding to the outer shape of the hair surface portion 321. A nail that is formed on the both sides of the right partition wall 322 as a frame portion that surrounds the periphery of the hair surface portion 321 and the inner periphery portion 322a of the right partition wall and supports the outer periphery portion of the hair surface portion 321 Part 323. The plate-like hairy surface portion 321 is fitted into the opening surrounded by the inner peripheral edge portion 322a of the right partition wall 322, and the position in the direction parallel to the right partition wall is regulated by the inner peripheral edge portion 322a. The outer peripheral end portions of both surfaces are sandwiched between the claw portions 323, and the position in the direction perpendicular to the right partition wall 322 is regulated and held.

  A silencer 33 is provided in each of the center passage and the side passage on the passenger seat side. The sound deadening member 33 is a plate-like door having a rotation shaft 36 rotatably supported by the central partition wall 34 and the side wall of the cylindrical body, and flat door plates extending on both sides of the rotation shaft 36. is there. That is, the flat door plate is similar to the muffling member 31 described above, and has a hair surface portion 331 whose surface is covered with hair on one or both surfaces, and an opening having a shape corresponding to the outer shape of the hair surface portion 331. And a frame portion 332 that surrounds the periphery of the hairy surface portion 331. Further, the hair-like surface portion 331 may be configured as an integrated object by bonding to the frame portion 332, and a plurality of hair-like surface portions 331 are provided on both surface sides of the inner peripheral edge portion of the frame portion 332, similar to the sound deadening members 31 and 32. The outer peripheral edge portion of the hair-like surface portion 331 may be supported and assembled by the claw portion.

  FIG. 7 is a cross-sectional view showing the silencing member 33 in the duct for blowing out the face on the passenger seat side. As shown in FIG. 7, passages 30 a and 30 b are formed between both surfaces of the muffling member 33 and the inner wall surface 19 a of the cylindrical duct (corresponding to the inner wall surface of the duct of the present invention). The passage on the passenger seat side inside the cylindrical body constituting the silencer 30 is opened and closed by two silencers 33 that are also plate-like doors, and four passages are formed by the left partition wall 35 and each silencer 33. It is divided into. The operation of the door that also functions as the muffling member 33 is controlled by the above-described control device in the same manner as other doors such as the air mix doors 6 and 7. Accordingly, the passenger seat side passage for blowing out the face has a silencing function and is configured to be cut off unlike the driver seat side passage.

  In addition, the side wall, each frame part, each partition wall, and each nail | claw part of the cylindrical body which form the silencer 30 are rigid body parts whose rigidity is higher than each hair surface part, for example, it forms with resin which can ensure rigidity. Has been.

Next, the structure of the muffling member 31 will be described on behalf of each of the muffling members. FIG. 4 is a side view showing the hairy surface portion 311 of the muffler member 31. FIG. 5 is a view in the direction of arrow V in FIG. The hair-like surface portion 311 is a non-woven fabric that forms a pile on the surface thereof, and a soft hair portion that is formed of a pile fabric, and can be composed of, for example, a filter material, a felt material, a velvet, a coal roof, or the like. For example, when the hair-like surface portion 311 is made of a non-woven fabric made of a fiber, it is formed into a rectangular soft portion having a basis weight of 130 g / m ² and a thickness of about 5 mm by a polyethylene fiber having a wire diameter of φ2 to 15 μm. The outer peripheral edge portion of the hair-like surface portion 311 is thermoset by heat treatment, is formed into a frame harder than the soft portion, and is supported by the claw portion 313.

  The operation of each door 15, 16, 17 and the flow of conditioned air in each blowing mode (face mode, bilevel mode, foot mode, foot differential mode, defroster mode) in the above configuration will be described.

  In the face mode, the face air outlet 12 is fully opened by the face door 16, the defroster air outlet 11 is closed by the defroster door 15, and the foot air outlet 13 is closed by the foot door 17. As a result, the conditioned air temperature-controlled by the air mix doors 6 and 7 flows through the passage in the face duct 19, and the bristles that cover the surface of the hair-like surface portion cause the boundary between the sound deadening members 31, 32, and 33 and the air. Formation of a shear layer on the surface or the contact surface of air is suppressed, and flow turbulence is suppressed. The air-conditioning wind that has flowed down the passage in the face duct 19 with the aerodynamic noise suppressed in this way flows out from the center indoor outlet and the side indoor outlet on the driver's seat side and the passenger seat side, and is blown toward the passenger. The

  The bi-level mode is a mode in which warm air is blown to the occupant's feet in an intermediate period such as spring and autumn, and cold air is blown to the occupant's upper body, thereby providing the head with cold air heat. In the bi-level mode, the face door 16 and the foot door 17 are controlled to open both the face air outlet 12 and the foot air outlet 13. Further, the defroster outlet 11 is closed by the defroster door 15. As a result, the conditioned air temperature-controlled by the air mix doors 6 and 7 is blown to the passage in the face duct 19 and the passage in the foot duct 20 at a predetermined rate, and enters the passage in the face duct 19. The cool air circulates, the warm air circulates in the passage in the foot duct 20, and the conditioned air having a difference in temperature between the upper and lower sides is provided in the passenger compartment.

  When a silencer having a plate-like silencer member provided at a distance from the inner wall surface of the duct is provided downstream of the foot outlet 13, the passage in the face duct 19 and the foot duct 20 are provided. In the conditioned air flowing through the inner passage, the hair covering the surface of the hair-like surface portion suppresses the formation of a shear layer on the boundary surface between the sound deadening member and the air or the contact surface of the air, and the turbulence of the flow is suppressed. It becomes like this. The air-conditioning wind that has flowed down the passage with the aerodynamic noise suppressed in this way flows out from the indoor outlet on the driver's seat side and the passenger seat side, and is blown toward the passenger.

  In the foot mode, the foot air outlet 13 is fully opened by the foot door 17, the face air outlet 12 is closed by the face door 16, and the defroster air outlet 11 is closed by the defroster door 15. In the case where a silencer having a plate-like silencer member provided at a distance from the inner wall surface of the duct is provided downstream of the foot outlet 13, the conditioned air adjusted in temperature by the air mix doors 6 and 7. The flow through the foot duct 20 and the hair covering the surface of the hair-like surface portion suppresses the formation of a shear layer at the boundary surface between the sound deadening member and the air or the contact surface of the air, thereby suppressing the turbulence of the flow. Will come to be. In this way, the air-conditioning wind that has been suppressed in the aerodynamic noise and has flowed down the passage in the foot duct 20 flows out from the air outlets on the driver seat side and the passenger seat side, and is blown toward the passenger.

  In the foot differential mode, the face air outlet 12 is closed by the face door 16, the foot air outlet 13 is fully opened by the foot door 17, and the defroster air outlet 11 is opened by the defroster door 15. When a silencer having a plate-like silencer member provided at a distance from the inner wall surface of the duct is provided downstream of the foot outlet 13 and the defroster outlet 11, The adjusted conditioned air is sent to both the passage in the defroster duct 18 and the passage in the foot duct 20, and the boundary between the sound deadening member and the air by the hair covering the surface of the hair-like surface portion. Formation of a shear layer on the surface or the contact surface of air is suppressed, and flow turbulence is suppressed. In addition, the front window can be prevented from fogging and a feeling of warmth toward the passenger's feet can be provided.

  In the defroster mode, the defroster air outlet 11 is fully opened by the defroster door 15, the foot air outlet 13 is closed by the foot door 17, and the face air outlet 12 is closed by the face door 16. In the case where a silencer having a plate-like silencer member provided at a distance from the inner wall surface of the duct is provided downstream of the defroster outlet 11, the conditioned air temperature-controlled by the air mix doors 6 and 7. The flow through the defroster duct 18 and the hair covering the surface of the hair-like surface portion suppresses the formation of a shear layer at the interface between the sound deadening member and the air or the contact surface of the air, thereby suppressing the turbulence of the flow. Will come to be. In this way, the conditioned air that has been suppressed in the aerodynamic noise and has flowed down the passage in the defroster duct 18 provides prevention of fogging of the front window.

  As mentioned above, due to the diligent research of the inventor of the present application, the turbulence of the fluid flow is promoted by the bending of the case outlet and the flow passage restriction in the duct rather than the interior of the indoor air conditioning unit, and the turbulence greatly affects the noise. I know you will. In particular, aerodynamic noise (sound generated in the process of wind hitting an object and creating a vortex behind it, that is, noise generated by the movement of airflow) is a passage in the downstream area where the static pressure is almost equal to the atmosphere. It is remarkable. In addition, the noise in the indoor air conditioning unit 1 including the noise of the blower is also propagated in the duct, which is one of the effective causes of noise reduction in the downstream duct.

  Therefore, according to the first embodiment, with respect to the air flow in the duct having a larger flow turbulence than in the case 2, the ciliary surface portion on both surfaces or one surface of the sound deadening member arranged along the air flow direction. Since the disturbance in the vicinity of the surface is suppressed by the pile, an air conditioner that can reduce aerodynamic noise in the duct downstream from the case outlet is obtained. Therefore, aerodynamic noise can be reduced without increasing the size of the indoor air conditioning unit 1. Furthermore, according to the first embodiment, since the hair-like surface portion is arranged at a distance from the rigid body portion such as the inner wall surface 19a of the duct, it is possible to effectively suppress low-frequency sound particularly important in automobile noise. is there.

  In particular, when the hair-like surface portions are provided on both surfaces of the plate-like member, the air flowing in the duct where the flow disturbance is large is suppressed by the hair-like surface portions on both surfaces of the silencer member. A reduction effect is obtained, and aerodynamic noise can be further reduced.

  The muffling member 33 is a door plate that opens and closes a passage in the duct downstream of the face air outlet 12 that is a case air outlet, and a bristle surface portion 331 is formed on both surfaces or one surface of the door plate. ing. According to this configuration, since the door that opens and closes the passage in the duct can also serve as a silencing member, it is possible to configure an apparatus that has both an air volume adjusting function as a door and a silencing function as a silencing member. Accordingly, by providing a device that integrates the door and the sound deadening member, there is no need to separately provide a member having a hair-like surface portion, so that an indoor air conditioning unit that achieves a reduction in mounting space and a simple device configuration can be obtained. It is.

  The muffling members 31 and 33 have frame portions 312 and 332 having higher rigidity than the hair-like surface portions 311 and 331, respectively, and the frame portions 312 and 332 support the outer peripheral edge portion of the hair-like surface portion. According to this configuration, since the relatively soft hair surface portions 311 and 331 are securely supported by the rigid frame portions 312 and 332, respectively, the hair surface portions 311 and 331 are stably installed in the passage. can do. Therefore, the silencing members 31 and 33 can stably provide a structure for allowing the conditioned air to flow along both surfaces, and can continuously exhibit a desired silencing function.

  Further, the noise-reducing members 31 and 33 are provided in the duct on the downstream side of the face air outlet 12 formed in the indoor air-conditioning unit 1 of the vehicle air conditioner. The level can be effectively reduced. In addition, by applying the present invention to an indoor air conditioning unit of a vehicle air conditioner, it is possible to expect a great effect of installing in a place where the mounting space of an automobile is limited by utilizing the technology capable of suppressing the physique of the indoor air conditioning unit 1.

(Second Embodiment)
In 2nd Embodiment, an indoor air-conditioning unit provided with the silencer 30A which is the other form of the silencer 30 is demonstrated with reference to FIG.8 and FIG.9. The indoor air-conditioning unit of this embodiment is the same as that of the first embodiment except for the silencer 30A, and has the same functions and effects. The description thereof is omitted here. FIG. 8 is a cross-sectional view showing a silencer 30A provided in a duct for blowing out a face. FIG. 9 is a cross-sectional view showing the silencer mechanism on the passenger seat side in FIG.

  As shown in FIGS. 8 and 9, the silencer 30 </ b> A has the same silencer members 31 and 32 on the driver's seat as the silencer 30, but the silencer mechanism on the passenger seat side is different. The passage on the passenger seat side of the silencer 30A is divided into two passages 30c and 30d in the left-right direction by the left partition wall 35A. Each of the passages 30c and 30d is provided with door plates 42 and 41 capable of opening and closing the upstream opening on the upstream side in the air flow direction of the cylindrical body (upward in the plane of FIG. 8). Door plates 52 and 51 capable of opening and closing the downstream opening on the downstream side in the flow direction are provided. The door plate 41 and the door plate 42 are one-side pivot type doors 40 that rotate integrally around the same rotating shaft 401 provided on one end side. The door plate 51 and the door plate 52 are one-side pivot type doors 50 that rotate integrally around the same rotation shaft 501 provided on one end side. The operation of the door 40 and the door 50 is controlled by a control device (not shown).

  As shown in FIG. 9, the rotation shaft 401 and the rotation shaft 501 are disposed on the opposite sides in the passages 30c and 30d. When the door plates 41, 42, 51, 52 are set at the positions shown in FIG. 9, the upstream opening and the downstream opening of the passage 30c are closed by the door plate 42 and the door plate 52, respectively, and the passage 30c is closed. The upstream opening and the downstream opening of the passage 30d are closed by the door plate 41 and the door plate 51, respectively, and the passage 30d becomes a closed space.

  A plurality of through holes 341 penetrating in the thickness direction are formed in the central partition wall 34A. A plurality of through holes 351 penetrating in the thickness direction are formed in the left partition wall 35A. For example, the central partition wall 34A and the left partition wall 35A have a thickness dimension of 2 mm, and the plurality of through holes 341 and the through holes 351 are small holes having an inner diameter of 3 mm, and are formed at intervals of 30 mm.

  When a closed space is formed in the passage 30c and the passage 30d by controlling the rotational positions of the door 40 and the door 50 in the passenger seat side passage having the above configuration, the closed space constitutes a resonance box, and the central partition A perforated resonance silencer is constructed together with the through holes 341 and 351 formed in the wall 34A and the left partition wall 35A, respectively.

In this perforated resonator, the diameter of the through hole is φ, the pitch of the through holes is D, the thickness of the partition wall in which the through holes are formed is t, the distance from the partition wall to the inner wall surface of the duct is H, When the aperture ratio, which is the ratio of the opening area of the through hole to the partition wall area, is P, the sound velocity is c, and the resonance frequency is f ₀ , the following formulas 1 and 2 are established.

当該穴あき型共鳴装置は、数式２によって演算されるｆ_０が騒音を抑制したい共振周波数になるように、数式１及び数式２の各パラメータを選択して製作することができる。このように助手席側の通路に構成した穴あき型共鳴装置は、フェイス吹出口１２から空調風を吹き出すモード（フェイスモード、バイレベルモード）において、助手席側の通路を閉じて運転席側のみから空調風を吹き出す場合に、助手席側の通路の閉空間を騒音の伝播を抑える消音装置として機能させようとするものである。

The perforated resonator can be manufactured by selecting each parameter of Equation 1 and Equation 2 so that f ₀ calculated by Equation 2 becomes a resonance frequency at which noise is desired to be suppressed. In this manner, the perforated resonance device configured in the passenger seat side passage closes the passenger seat side passage in the mode (air mode, bi-level mode) for blowing the conditioned air from the face air outlet 12 only on the driver seat side. When the conditioned air is blown out from the passenger compartment, the closed space of the passenger seat side passage is caused to function as a silencer that suppresses noise propagation.

  According to the second embodiment, the plurality of door plates 41, 51, 42, and 52 that respectively open and close the passages in the duct that connects the face indoor outlet and the face outlet on the passenger side are provided. The plates 41, 51, 42, 52 are arranged at intervals in the flow direction of the conditioned air, and a plurality of through holes 341, 351 penetrating in the thickness direction are formed in the central partition wall 34A and the left partition wall 35A, respectively. ing.

  According to this configuration, a closed space can be formed in the passage in the duct by the plurality of door plates 41, 51, 42, 52 arranged on the upstream side and the downstream side in the flow direction of the conditioned air. A plurality of through holes 341 and 351 formed in the wall 34A and the left partition wall 35A form a communication path that connects the closed space and the outside. With this configuration, it is possible to construct a perforated resonance silencer using a door and a partition wall inside the duct connecting the face indoor air outlet on the passenger seat side and the face air outlet. Therefore, the closed space functions as a resonance box, and noise transmitted from the inside of the case 2 on the upstream side can be reduced.

(Third embodiment)
In the third embodiment, an indoor air conditioning unit 1A will be described with reference to FIG. An indoor air-conditioning unit 1A of this embodiment is another example of the perforated resonance apparatus shown in the second embodiment. In the indoor air conditioning unit 1A, a perforated resonance device is provided on the downstream side of the case air outlet, and the above-mentioned closed space is formed for the case air outlet that does not blow the conditioned air in the set air outlet mode. It functions as a silencer that suppresses propagation.

  As shown in FIG. 10, the indoor air conditioning unit 1 </ b> A includes, as an example, a perforated resonance device having two doors 15 </ b> A and a door 60 on the downstream side of the defroster outlet 11. The plurality of through holes 151 are formed in the door plate of the door 15A located on the downstream side of the air flow.

  According to the third embodiment, the plurality of doors 15A and 60 are provided to open and close the passages in the duct connecting the defroster indoor outlet 21 and the defroster outlet 11, respectively. A plurality of through-holes 151 are formed in at least one of the doors 15A and 60 so as to pass through the door plate.

  According to this configuration, the closed space 18a can be formed in the passage in the duct by the plurality of door plates arranged on the upstream side and the downstream side in the flow direction of the conditioned air, and the plurality of door plates are further formed. The through-hole 151 forms a communication path that connects the closed space 18a and the outside. Thus, a perforated resonance silencer using a door can be constructed inside the duct connecting the defroster air outlet 21 and the defroster air outlet 11. Therefore, the closed space 18a functions as a resonance box, and noise transmitted from the inside of the case 2 on the upstream side is reduced.

  Thus, when the face mode, the foot mode, and the bi-level mode are set as the blowing mode, the indoor air conditioning unit 1A closes the closed space 18a by closing the passage with the upstream door 15A and the downstream door 60. The closed space 18a forms a resonance box, and a perforated resonance silencer is constructed. Similarly to the second embodiment, the resonance-type silencing effect of the perforated resonance silencing device suppresses the propagation of noise to the indoor outlet from which the conditioned air is blown, thereby reducing noise.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In the said embodiment, although it is the structure provided with the silencing member 31 grade | etc., In the channel | path in the downstream of the face blower outlet 12, a silencing member is provided in the channel | path in a duct downstream from other case blower outlets. Also good. That is, the indoor air conditioning units 1 and 1A only need to include a silencer in the downstream duct for at least one of the plurality of case outlets of the air conditioner.

  In the above-described embodiment, the indoor air conditioning units 1 and 1A are devices that provide left and right independent temperature control that supplies temperature-controlled air from the left and right outlets toward the vehicle interior, but such control is possible. It is not limited to the apparatus to make.

1 ... Indoor air conditioning unit 2 ... Case 11 ... Defroster outlet (case outlet)
12 ... Face outlet (case outlet)
15A ... Door 19 ... Face duct (duct)
19a ... Inner wall surface of duct 21 ... Defroster indoor outlet (indoor outlet)
22 ... Face indoor outlet (indoor outlet)
30a, 30b ... passage 31, 32, 33 ... muffling member 60 ... door 151 ... through-hole 311, 321, 331 ... hairy surface part 312, 332 ... frame part

Claims (5)

A case (2) in which a passage through which air-conditioned air is directed toward the room is formed;
A duct (19) connecting the case air outlet (12) formed in the case and the indoor air outlet so that the conditioned air is blown out from the indoor air outlet (22) exposed to the room;
A plate-like member disposed downstream from the case outlet and spaced from the inner wall surface (19a) of the duct, the passage (30a) between both surfaces of the plate-like member and the inner wall surface of the duct 30b) and a muffler member (31),
The silencing member comprises a hairy surface portion (311) whose surface is covered with hair on at least one surface of the both surfaces,
The inner wall surface (19a) of the duct facing the surface on which the hairy surface portion is provided with a space therebetween forms a passage that is not a bent portion,
The surface on which the hairy surface portion is provided is provided along the flow direction of the conditioned air in a passage that is not the bent portion ,
The silencing member has frame portions (312 and 332) that are stiffer than the hair surface portion, and the frame portion has an opening that exposes the hair surface portion to the passage, and is outside the hair surface portion. air conditioning system, characterized that you support the periphery. A case (2) in which a passage through which air-conditioned air is directed toward the room is formed;
A duct (19) connecting the case air outlet (12) formed in the case and the indoor air outlet so that the conditioned air is blown out from the indoor air outlet (22) exposed to the room;
A plate-like member disposed downstream from the case outlet and spaced from the inner wall surface (19a) of the duct, the passage (30a) between both surfaces of the plate-like member and the inner wall surface of the duct 30b) and a muffler member (31),
The silencing member (31) includes a hairy surface portion (311) whose surface is covered with hair on at least one surface of the both surfaces,
And a plurality of doors (15A, 60) for opening and closing the passages in the duct (18) connecting the indoor air outlet (21) and the case air outlet (11), respectively.
The plurality of doors are arranged at intervals in the flow direction of the conditioned air, and at least one door is formed with a plurality of through holes (151) that penetrate the door plate. Air conditioner. The silencing member (33) is a door plate that opens and closes a passage in the duct (19) downstream of the case outlet, and the hair-like surface portion is formed on at least one surface of the door plate. The air conditioner according to claim 1, wherein the air conditioner is provided .   The air-conditioning apparatus according to any one of claims 1 to 3, wherein the bristle surface portions are provided on both surfaces of the plate-like member. The room from which the conditioned air is blown is an automobile room,
The air conditioner according to any one of claims 1 to 4 , wherein the case air outlet (12) is a face air outlet.

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