JP6551607B2 - Air conditioning unit for vehicles - Google Patents

Description

Cross-reference to related applications

  This application is based on Japanese Patent Application No. 2016-122837 filed on June 21, 2016, the contents of which are incorporated herein by reference.

  The present disclosure relates to an air conditioning unit having a blower in an air conditioning case.

  DESCRIPTION OF RELATED ART Conventionally, there exist some which were described, for example in patent document 1 as an air conditioning unit which air-conditions a backseat. The air conditioning unit described in Patent Document 1 is accommodated in a space between a vehicle outer plate and a quarter trim. There is also an air conditioning unit for air conditioning the rear seat, which is installed on the ceiling of the vehicle in the vehicle interior.

Japanese Patent Laying-Open No. 2015-44451

  However, according to the inventor's examination, in the conventional rear seat air conditioning unit, the noise generated in the air conditioning case is discharged into the vehicle interior from the air suction port that sucks the air in the vehicle interior. The noise is noise due to the air flow from the air inlet to the blower, noise due to the air flow in the blower, and further noise of the motor of the blower.

  And according to the inventor's examination, when the air conditioning unit is installed on the ceiling of the vehicle, the sound emitted from the air suction opening into the vehicle compartment is particularly problematic because the air suction opening is close to the head of the occupant. Become.

  The present disclosure aims to reduce the noise of an air conditioning unit installed on the ceiling of a vehicle.

  According to one aspect of the present disclosure, a vehicle air conditioning unit installed on a ceiling of a vehicle in a vehicle cabin includes an air inlet for sucking in air in the vehicle cabin, an air outlet for blowing air into the vehicle cabin, and an air inlet. An air conditioning case having an air passage for circulating air from the air outlet, an air passage disposed in the air passage, a blower generating an air flow, and an air passage disposed on the air flow downstream side of the blower And a plate-like sound insulation guide disposed between the air suction port and the air inlet of the fan in the air passage to attenuate sound propagating from the fan to the air suction port. .

It is a top view showing the composition of the air-conditioning unit for vehicles concerning one embodiment. It is II-II sectional drawing of FIG. It is III-III sectional drawing of FIG.

  Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. FIG. 1 shows a state in which the upper case is removed in order to facilitate understanding of the internal configuration. Further, the front and rear arrows, the left and right arrows, and the up and down arrows in the drawing respectively indicate the directions in the vehicle mounted state.

  As shown in FIG. 1, FIG. 2 and FIG. 3, a rear seat air conditioning unit for air conditioning the rear seat side of the passenger compartment is fixed to a ceiling 92 in a passenger compartment 91 and installed. More specifically, the rear seat air conditioning unit is disposed above the rear seat and at a substantially central portion in the vehicle left-right direction. The rear seat air conditioning unit corresponds to the vehicle air conditioning unit.

  The air conditioning system for a vehicle includes a rear air conditioning unit and a front air conditioning unit (not shown) for air conditioning the front seat side of the passenger compartment. The air conditioning unit for the front seat is a known unit disposed inside the instrument panel at the foremost part of the passenger compartment, and thus the description thereof is omitted.

  The rear seat air conditioning unit includes an air conditioning case 1, a blower 3, and a heat exchanger 5 as main components. An air passage 10 through which air is circulated is formed inside the air conditioning case 1. The blower 3 is disposed in the air passage 10 to generate an air flow. The heat exchanger 5 is disposed in the air passage 10 downstream of the air flow from the blower 3 and exchanges heat with air.

  The air passage 10 is roughly divided into three parts. That is, the air passage 10 includes an upstream passage 101 extending from the air inlet 14 to the blower 3, a blower downstream passage 102 extending from the blower 3 to the heat exchanger 5, and heat exchange from the heat exchanger 5 to the air outlet 15. It consists of a vessel downstream section passage 103.

  The blower downstream passage 102 is located below the heat exchanger downstream passage 103. More specifically, the blower downstream passage 102 and the heat exchanger downstream passage 103 are disposed to overlap in the vertical direction (that is, the top-bottom direction). As a result, the projection area when the rear seat air conditioning unit is viewed in the vertical direction is reduced.

  The air conditioning case 1 is formed of a resin (for example, polypropylene) having a certain degree of elasticity and excellent in strength.

  At the front of the vehicle in the air conditioning case 1 and at the most upstream part of the air passage 10, an air suction port 14 for drawing in the air in the casing 91 and flowing it into the air passage 10 is formed. The air suction port 14 is formed over substantially the entire width of the air conditioning case 1 in the left-right direction of the vehicle. Moreover, the opening part of the air suction inlet 14 is a rectangle, and is opened toward the diagonally downward direction of the vehicle front side.

  On the rear side of the vehicle in the air conditioning case 1 and at the most downstream part of the air passage 10, an air outlet 15 for blowing out the air having passed through the air passage 10 into the compartment 91 is formed. A plurality of air outlets 15 are arranged side by side along the vehicle left-right direction. Each air outlet 15 is provided with a blow grill 16 for adjusting the air blow direction.

  The blower 3 is a centrifugal multiblade fan including an electric motor 31, an impeller 32, and a scroll case 33. The blower 3 is disposed in the air passage 10 and generates an air flow. A more detailed arrangement position of the blower 3 is a substantially central portion in the longitudinal direction of the vehicle in the air conditioning case 1, a left end portion in the lateral direction of the vehicle in the air conditioning case 1, and a lower portion in the vertical direction of the air conditioning case 1.

  The scroll case 33 is integrally formed with the air conditioning case 1. And in this scroll case 33, the impeller 32 is accommodated rotatably. An air inlet 34 for introducing air through the upstream passage 101 is formed in the upper wall surface of the scroll case 33.

  The impeller 32 is a sirocco fan having a large number of blades, and is rotationally driven by the electric motor 31 to suck in air from the air inlet 34 in the rotational axis direction of the impeller 32, and the air is used for the impeller 32. Blow out radially outward. The blown air flows horizontally from the left side of the vehicle toward the right side in the blower downstream passage 102 and is sent to the lower surface side of the heat exchanger 5. Note that the central axis of the blower 3, in other words, the rotation axis of the impeller 32 and the rotation axis of the electric motor 31 extend in the vertical direction.

  The heat exchanger 5 is one of the devices constituting a well-known vapor compression type refrigeration cycle (not shown), and cools air by evaporating a low-pressure refrigerant in the refrigeration cycle to exert an endothermic effect.

  The heat exchanger 5 is disposed on the air flow downstream side of the blower 3 in the air passage 10. More specifically, the heat exchanger 5 is disposed substantially at the center of the air conditioning case 1 in the left-right direction of the vehicle.

  The heat exchanger 5 is mounted such that the air inflow surface and the air outflow surface are substantially horizontal, and is supplied from the blower 3 via the blower downstream portion passage 102 as shown by the broken line arrow C in FIG. The air flows in the heat exchanger 5 from below to above. Then, after the air having passed through the heat exchanger 5 collides with the inner wall surface of a portion of the air conditioning case 1 located above the heat exchanger 5, as shown by dashed arrows D and E in FIG. In the downstream passage 103, it is divided into left and right and sent to the air outlet 15.

  In the upstream passage 101, a plate-shaped separation wall 17, a plate-shaped first sound insulation guide 18, and a plate-shaped second sound insulation guide 19 are disposed.

  Separation wall 17 is arranged at a substantially central portion in the left-right direction of the vehicle in air-conditioning case 1 and extends in the left-right direction and the up-down direction of the vehicle. As a result, the air sucked from the air suction port 14 is guided to the air introduction port 34 through two paths as shown by dashed arrows A and B in FIG. 1. The separation wall 17 is integrally formed with the air conditioning case 1.

  The first sound insulation guide 18 extends in the vehicle left-right direction and the front-rear direction (that is, the horizontal direction). The arrangement position of the first sound insulation guide 18 is on the front side of the air introduction port 34 on the vehicle front side, at the left end of the air conditioning case 1 in the left-right direction of the vehicle. Between the opposing wall surface 20 and the blower 3. A gap for circulating air is formed between the first sound insulation guide 18 and the opposed portion wall surface 20.

  The second sound insulation guide 19 extends in the vehicle left-right direction and the front-rear direction (that is, the horizontal direction). The second sound insulation guide 19 is disposed between the first sound insulation guide 18 and the blower 3. More specifically, a gap for circulating air is formed between the second sound insulation guide 19 and the first sound insulation guide 18. The lower surface side of the second sound insulation guide 19 is in close contact with the scroll case 33.

  When viewed along the central axis direction of the blower 3, the vehicle front side portion of the first sound insulation guide 18 and the vehicle rear side portion of the second sound insulation guide 19 overlap.

  The first sound insulation guide 18 and the second sound insulation guide 19 are joined to the air conditioning case 1 by screws, for example.

  A packing 21 made of a sound absorbing material is mounted on the upper surface of the first sound insulation guide 18, in other words, the surface of the first sound insulation guide 18 on the side of the opposing wall surface 20.

  As shown in FIG. 3, the air conditioning case 1 is configured by joining an upper case 11, a middle case 12, and a lower case 13. And the heat insulation space 22 used as the heat insulation layer of air is formed of the upper case 11 and the middle case 12. The air in the heat insulation space 22 thermally insulates the heat exchanger downstream passage 103 from the outside, thereby preventing condensation in the heat exchanger downstream passage 103 through which the cold air passes.

  Next, the operation of the air conditioning unit for the rear seat of the present embodiment will be described.

  By the operation of the blower 3, the air sucked from the air suction port 14 is introduced into the blower 3 through the upstream passage 101. The air is sent to the heat exchanger 5 through the blower downstream passage 102. The air sent to the heat exchanger 5 exchanges heat with the refrigerant when passing through the heat exchanger 5 and is cooled. The cooled air flows in the air passage 10 and is blown out from the blowout grill 16 into the passenger compartment 91.

  Here, along with the operation of the blower 3, noise is generated due to the air flow from the air inlet 14 to the air inlet 34, and the noise due to the air flow in the blower 3 and the noise of the motor 31 of the blower 3 Occur.

  The noise generated in the blower 3 is discharged from the air inlet 34 to the upstream passage 101, and further discharged from the air inlet 14 to the passenger compartment 91 through the upstream passage 101.

  At this time, the sound emitted from the air inlet 34 and propagating to the air inlet 14 is attenuated when it is reflected upon collision with the opposing wall surface 20, the first sound insulation guide 18, and the second sound insulation guide 19. . At this time, the surface on the facing portion wall surface 20 side of the first sound insulation guide 18 reflects the sound reflected by the facing portion wall surface 20 toward the facing portion wall surface 20. Then, the surface of the second sound insulation guide 19 on the side of the first sound insulation guide 18 reflects the sound reflected by the first sound insulation guide 18 toward the first sound insulation guide 18. At the same time, the sound emitted from the air inlet 34 is attenuated when it passes through the opposing wall surface 20, the first sound insulation guide 18, and the second sound insulation guide 19. Further, the sound emitted from the air inlet 34 is also attenuated by the packing 21.

  On the other hand, noise generated by the air flow from the air suction port 14 to the air introduction port 34 and propagated to the air suction port 14 also collides with the opposing wall surface 20, the first sound insulation guide 18, and the second sound insulation guide 19. It is attenuated when it is reflected. At this time, the surface on the facing portion wall surface 20 side of the first sound insulation guide 18 reflects the sound reflected by the facing portion wall surface 20 toward the facing portion wall surface 20. Then, the surface of the second sound insulation guide 19 on the side of the first sound insulation guide 18 reflects the sound reflected by the first sound insulation guide 18 toward the first sound insulation guide 18. At the same time, the noise due to the air flow from the air inlet 14 to the air inlet 34 is attenuated when passing through the facing portion wall surface 20, the first sound insulation guide 18, and the second sound insulation guide 19. Further, noise due to the air flow from the air inlet 14 to the air inlet 34 is also attenuated by the packing 21.

  Moreover, in the area | region where the 1st sound insulation guide 18 and the 2nd sound insulation guide 19 are arrange | positioned in the upstream part channel | path 101, air flows in a substantially horizontal direction. And since the first sound insulation guide 18 and the second sound insulation guide 19 both extend in the horizontal direction, it is possible to reduce the increase in pressure loss due to the provision of the first sound insulation guide 18 and the second sound insulation guide 19.

  According to the present embodiment, since the noise generated in the air conditioning case 1 is attenuated and then released into the compartment 91, the noise of the air conditioning unit for the rear seat can be reduced.

  In addition, since the fan downstream passage 102 and the heat exchanger downstream passage 103 overlap in the vertical direction, the projection area when the rear seat air conditioning unit is viewed in the vertical direction can be reduced. it can.

  Further, the air in the heat insulation space 22 formed by the upper case 11 and the middle case 12 prevents condensation in the heat exchanger downstream passage 103 through which the cold air passes.

(Other embodiments)
In the above embodiment, the first sound insulation guide 18 and the second sound insulation guide 19 are provided. However, even if only the first sound insulation guide 18, that is, the second sound insulation guide 19 is eliminated, the noise of the rear seat air conditioning unit can be reduced.

  In the above embodiment, the packing 21 is attached to the upper surface of the first sound insulation guide 18. However, even if the packing 21 is eliminated, the noise of the rear seat air conditioning unit can be reduced.

  Note that the present disclosure is not limited to the above-described embodiment, and can be modified as appropriate.

  Further, in the above embodiment, it is needless to say that the elements constituting the embodiment are not necessarily essential except in the case where it is clearly indicated that it is particularly essential, and in the case where it is considered to be obviously essential in principle. .

  Further, in the above embodiment, when numerical values such as the number, numerical value, amount, range and the like of the constituent elements of the embodiment are mentioned, it is clearly indicated that it is particularly essential and clearly limited to a specific number in principle. It is not limited to the specific number except in the case where

  Further, in the above embodiment, when referring to the shapes, positional relationships, etc. of the components etc., unless specifically stated otherwise or in principle when limited to a specific shape, positional relationship, etc., the shapes, positions, etc. It is not limited to relationships.

(Summary)
According to the first aspect shown in a part of the above embodiment, the vehicle air conditioning unit installed on the ceiling of the vehicle is disposed between the air suction port and the air inlet port of the fan in the air passage. And a plate-like sound insulation guide for attenuating the sound propagating from the blower to the air inlet.

  Further, according to the second aspect, the sound insulation guide is disposed between the opposing wall surface, which is a wall surface of the portion facing the air inlet in the air conditioning case, and the blower, and the sound reflected by the opposing wall surface Is reflected toward the wall of the opposite part.

  According to this, the sound is attenuated when it collides with and is reflected by the wall surface of the facing portion and the sound insulation guide, and is attenuated when it passes through the wall surface of the facing portion and the sound insulation guide.

  Also, according to the third aspect, the second sound insulation guide is disposed between the first sound insulation guide and the blower, and reflects the sound reflected by the first sound insulation guide toward the first sound insulation guide. .

  According to this, the sound is attenuated when it collides with and reflected from the first sound insulation guide and the second sound insulation guide, and is attenuated when it passes through the first sound insulation guide and the second sound insulation guide.

  Moreover, according to the 4th viewpoint, the packing which consists of a sound-absorbing material is mounted | worn with the surface which reflects the sound in a sound-insulation guide.

  According to this, since the sound is efficiently attenuated by the packing, the noise of the air conditioning unit can be further reduced.

Claims (4)

A vehicle air conditioning unit installed on a ceiling (92) of a vehicle in a cabin (91),
It has an air inlet (14) for sucking air in the vehicle compartment, an air outlet (15) for blowing air into the vehicle compartment, and an air passage (10) for circulating air from the air inlet to the air outlet. Air conditioning case (1),
A blower (3) disposed in the air passage to generate an air flow;
A heat exchanger (5) disposed in the air passage downstream of the air flow from the blower for exchanging heat with air;
A plate-shaped sound insulation guide (18) disposed between the air suction port and the air introduction port (34) of the blower in the air passage to attenuate sound propagating from the blower to the air suction port; Equipped with
The sound insulation guide is disposed between the blower and the facing wall surface (20), which is the wall surface of the air conditioning case facing the air inlet, and the sound reflected by the facing wall surface is A vehicle air conditioning unit that reflects towards the wall of the opposite part . The sound insulation guide is a first sound insulation guide,
The second sound insulation guide (19) is disposed between the first sound insulation guide and the blower, and reflects the sound reflected by the first sound insulation guide toward the first sound insulation guide. The air conditioning unit for vehicles described in 1. A vehicle air conditioning unit installed on a ceiling (92) of a vehicle in a cabin (91),
It has an air inlet (14) for sucking air in the vehicle compartment, an air outlet (15) for blowing air into the vehicle compartment, and an air passage (10) for circulating air from the air inlet to the air outlet. Air conditioning case (1),
A blower (3) disposed in the air passage to generate an air flow;
A heat exchanger (5) disposed in the air passage downstream of the air flow from the blower for exchanging heat with air;
A plate-like sound insulation guide (18) disposed between the air inlet and the air inlet (34) of the fan in the air passage, for attenuating the sound propagating from the fan to the air inlet; equipped with a,
The sound insulation guide is a first sound insulation guide,
An air conditioning system for a vehicle, comprising: a second sound insulation guide (19) disposed between the first sound insulation guide and the blower and reflecting a sound reflected by the first sound insulation guide toward the first sound insulation guide unit.   The vehicle air conditioning unit according to any one of claims 1 to 3, wherein a packing (21) made of a sound absorbing material is attached to the surface of the sound insulation guide on which the sound is reflected.

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