CN104343727A - Centrifugal air blower and vehicle-mounting air-conditioning apparatus comprising same - Google Patents
Centrifugal air blower and vehicle-mounting air-conditioning apparatus comprising same Download PDFInfo
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- CN104343727A CN104343727A CN201410365807.5A CN201410365807A CN104343727A CN 104343727 A CN104343727 A CN 104343727A CN 201410365807 A CN201410365807 A CN 201410365807A CN 104343727 A CN104343727 A CN 104343727A
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- air
- centrifugal fan
- centrifugal blower
- wall
- suction port
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
A centrifugal air blower and vehicle-mounting air-conditioning apparatus capable of improving air flow amount. The centrifugal blower (1) comprises: a multifin centrifugal fan (3), having a plurality of blades (8) arranged around a rotating shaft (6); a scroll-shaped casing (4) accommodating the centrifugal fan (3) and having an air suction inlet (11) and a flow passage vortex-shaped flow path (12) as a flow path for air from multiple fins centrifugal fan exhaust air; and a diffuser portion (5), which has a expanded stream path (19) and an outlet (20), wherein the downstream end of the vortex-shaped flow path (12) is communiated with the expanded stream path (19), and changes the height of the flow path in a manner of the cross-sectional area increasing with downstream side of the air flow. The outlet is opened at the downstream of the expanded stream path. The centrifugal blower is provided with multiple fins from centrifugal fan exhaust air flow rate uniform distribution of the upstream distribution equalizing element (18), wherein the upper side wall (21) of the diffuser portion of the inclined starting position than the lower side wall disposed in the diffuser portion (22) is inclined starting position closer to the air flow position side.
Description
Technical field
The present invention relates to a kind of centrifugal blower and comprise the air conditioner for motor vehicle of this centrifugal blower, particularly, the centrifugal blower that the shape relating to a kind of diffuser portion to centrifugal blower is improved and air conditioner for motor vehicle.
Background technique
This centrifugal blower is accommodated with multiblade centrifugal fan in volute casing, this multiblade centrifugal fan have be configured in turn axial permitted a more blades, formation vortex shape stream around the multiblade centrifugal fan in this volute casing.When utilizing the driving sources such as electric motor to drive multiblade centrifugal fan to rotate, from the suction port being formed at volute casing, air is attracted to the inner side of multiblade centrifugal fan, and this air is discharged to the radial outside of multiblade centrifugal fan, and via vortex shape stream, the blow-off outlet of above-mentioned air from the downstream side being formed at air stream is blown out.
Like this, because this centrifugal blower sucks air from the axis direction end side of rotating shaft, and change the flow direction structure of being discharged by air to the radial outside of multiblade centrifugal fan, therefore, in general known have court and the trend the direction set of the suction port opposite side (lower plate side) of volute casing from the air-flow of the air of multiblade centrifugal fan discharge.
As this centrifugal blower, such as, there will be a known centrifugal blower disclosed in patent documentation 1 and patent documentation 2.
In centrifugal blower disclosed in patent documentation 1, as shown in Figure 8, horn mouth (Japanese: ベ Le マ ウ ス) is utilized to be sucked efficiently from outside by air, wherein, above-mentioned horn mouth is formed by making the upper plate of the volute casing of suction port periphery bend towards the blade-side of multiblade centrifugal fan.In above-mentioned centrifugal blower, when utilizing the rotation of multiblade centrifugal fan to make air flow into from suction port, as shown in Figure 8, in the suction port side (upper plate side) of volute casing, because there is the stripping of air stream at the front end place of bell-mouthed multiblade centrifugal fan side, and air does not have to flow into the suction side of blade substantially, and become the state of stagnation.By this, the flowing of air of discharging from blade is towards the direction set of the lower plate side of volute casing, and therefore, the velocity flow profile of the air of discharging from blade is accelerated in local, lower plate side, and becomes the main cause producing noise.
In addition, in centrifugal blower disclosed in patent documentation 2, as multiblade centrifugal fan, be formed as the fan of external diameter along with the rounding frustum shape increased to suction port side by adopting, thus make the velocity flow profile homogenization of the air of discharging from blade, realize the reduction of noise by this.In above-mentioned centrifugal blower, compared with centrifugal blower disclosed in patent documentation 1, although improve from the flowing of the air of blade discharge to the concentrated of lower plate side, but still can in the direction set of lower plate side.
In addition, the centrifugal blower of above-mentioned patent documentation 1 and patent documentation 2 is such as used as the blowing unit of air conditioner for motor vehicle (HVAC), terminates place of portion be provided with the diffuser portion exit portion of vortex shape stream of volute casing be connected with the intake section of thermostat unit at the scrollwork of volute casing.
Prior art document
Patent documentation
Patent documentation 1: Japanese Patent Laid-Open 2008-280939 publication
Patent documentation 2: Japanese Patent Laid-fair 7-94838 publication
Summary of the invention
Invent technical problem to be solved
At this, the present inventor confirms be provided with in bell-mouthed centrifugal blower in the same manner as patent documentation 1, if improve above-mentioned bell-mouthed height, then can suppress the stripping occurred in the end of bell-mouthed multiblade centrifugal fan side.In addition, after carrying out observation by the flowing of PIV (particle image velocimetry method (Particle Image Velocimetry)) visualized experiment to the air of discharging from above-mentioned multiblade centrifugal fan, if improve bell-mouthed height, then from the velocity flow profile homogenization of air that multiblade centrifugal fan is discharged, and air towards flow direction lower plate side, so extreme deflection shown in Fig. 8 reduces.
In addition, the present inventor is in the centrifugal blower of fan using rounding frustum shape in the same manner as patent documentation 2, the external diameter of the fan of suction port side is increased further, and it is known after having carried out PIV visualized experiment as described above, the flow direction of air of discharging from this multiblade centrifugal fan is compared with the centrifugal blower of patent documentation 2, and air reduces towards the extreme deflection of the lower plate side of volute casing.
By improving the fan external diameter of the suction port side of the fan of bell-mouthed height or increase rounding frustum shape like this, can make in the lower plate of volute casing and reduce with the pressure loss that the lower wall place in lower plate continuous print diffuser portion produces because of surface friction drag etc., therefore, when the output of the power sources such as electric motor is identical, air quantity can be made to increase, when air quantity is identical, the output of power source can be made to decline.
But, the fan external diameter of the suction port side of the fan of bell-mouthed height or increase rounding frustum shape is improved if can know, although there is no the extreme deflection of the flow direction as shown in Fig. 8, there will be on the contrary flow direction towards upper plate lateral deviation to situation.
In this case, owing to not being the extreme deflection of flow direction, therefore, compared with centrifugal blower disclosed in patent documentation 1 and patent documentation 2, air quantity can be improved as described above, but, due to the flow direction of air that flows in volute casing towards upper plate lateral deviation to, therefore, pressure can lose the amount corresponding to friction at the upper plate of volute casing and the upper side wall place in diffuser portion etc., thus, there is the leeway that air quantity can be made to improve, and wish to improve.
The present invention is conceived to above-mentioned this actual conditions and does, its object is to the air conditioner for motor vehicle a kind of centrifugal blower being provided and comprising this centrifugal blower, in above-mentioned centrifugal blower, when improving the shape of bell-mouthed shape and multiblade centrifugal fan, making the velocity flow profile homogenization of the air of discharging from multiblade centrifugal fan, more efficiently can improve air quantity.
The technological scheme that technical solution problem adopts
According to the one side of centrifugal blower of the present invention, centrifugal blower comprises: multiblade centrifugal fan, this multiblade centrifugal fan has to be configured in and turns an axial multiple blade, and air intake is discharged to radial outside from the axis direction of above-mentioned rotating shaft by above-mentioned multiblade centrifugal fan, volute casing, this volute casing is received above-mentioned multiblade centrifugal fan, and has the vortex shape stream using the suction port of above-mentioned air intake and the stream as the air of discharging from above-mentioned multiblade centrifugal fan, and diffuser portion, this diffuser portion has expansion stream and blow-off outlet, wherein, above-mentioned expansion stream is the stream that the downstream flowed with the air of above-mentioned vortex shape stream is communicated with, and change to make the path heights of the axis direction of above-mentioned rotating shaft in the mode making the sectional area of above-mentioned stream expand along with the downstream side of flowing towards air, the downstream-end opening that above-mentioned blow-off outlet flows at the air of above-mentioned expansion stream, above-mentioned centrifugal blower has the flow velocity making the air of discharging from above-mentioned multiblade centrifugal fan, the distribution uniformity element of the distribution uniformity on the axis direction of above-mentioned rotating shaft, above-mentioned diffuser portion makes the upper side wall of above-mentioned suction port side and tilts towards the direction be separated from each other along with the downstream side of flowing towards air with the lower wall faced by this upper side wall, the inclination initial position of above-mentioned upper side wall is arranged on the position more leaning on the upstream side of air flowing than the inclination initial position of above-mentioned lower wall.
According to the one side of air conditioner for motor vehicle of the present invention, be formed as comprising above-mentioned centrifugal blower and thermostat unit, wherein, said temperature regulon utilizes the temperature of heat exchanger to the air that the above-mentioned diffuser portion from above-mentioned centrifugal blower sends regulate and be blown out to car indoor.
Invention effect
Centrifugal blower of the present invention and comprise this centrifugal blower air conditioner for motor vehicle owing to comprising the distribution uniformity element of the velocity flow profile homogenization making the air of discharging from multiblade centrifugal fan, and the upper side wall in diffuser portion is tilted from the position of the upstream side of air flowing is more leaned in the inclination initial position of the lower wall than diffuser portion, therefore, distribution uniformity element can be utilized to make velocity flow profile homogenization, consequently, even from multiblade centrifugal fan discharge air be flowing in towards volute casing by suction port side direction occur deflection state arrive the expansion stream in diffuser portion when, earlier inclination is expanded than lower wall owing to making upper side wall, therefore, the flow velocity of the air that the velocity ratio of the air flowed near upper side wall can be made to flow near lower wall declines quickly, friction of the air stream that can effectively reduce because of and collide with upper side wall etc. and the pressure loss caused.
In addition, such as, air flowing towards upper side wall direction occur deflection state under, make upper side wall in the position identical with lower wall or when more leaning on the position in the downstream side of air flowing to start to tilt than lower wall, easily near lower wall, produce stagnant areas, consequently, can be under pressure loss, but in centrifugal blower of the present invention, start to tilt in the position of the upstream side, inclination initial position than lower wall owing to making upper side wall, therefore, also effectively the pressure loss can be reduced in this.
Like this, the structure of distribution uniformity element comprising the velocity flow profile homogenization making the air of discharging from multiblade centrifugal fan, even if the flowing of air is partial to towards the direction of upper side wall, also in diffuser portion, effectively can reduce the pressure loss because of above-mentioned deflection, therefore, it is possible to improve air quantity efficiently.
Accompanying drawing explanation
Fig. 1 is the longitudinal section of the schematic construction of the centrifugal blower representing first embodiment of the invention.
Fig. 2 is that the A-A alignment shown in Fig. 1 looks sectional view.
Fig. 3 is the schematic diagram of the air conditioner for motor vehicle comprising the centrifugal blower shown in Fig. 1.
Fig. 4 is the flow direction of the air represented in the centrifugal blower shown in Fig. 1 and the suction port of an example of velocity flow profile and the schematic diagram of blade-section.
Fig. 5 is the longitudinal section of the schematic construction of the centrifugal blower representing second embodiment of the invention.
Fig. 6 is the flow direction of the air represented in the centrifugal blower shown in Fig. 5 and the suction port of an example of velocity flow profile and the schematic diagram of blade-section.
Fig. 7 is the stereogram of the centrifugal blower of third embodiment of the invention.
Fig. 8 is the flow direction of the air represented in existing centrifugal blower and the suction port of an example of velocity flow profile and the schematic diagram of blade-section.
(symbol description)
1 ... centrifugal blower
3 ... multiblade centrifugal fan
4 ... volute casing
5 ... diffuser portion
6 ... rotating shaft
8 ... blade
11 ... suction port
12 ... vortex shape stream
14 ... tongue
15 ... upper plate
16 ... lower plate
17 ... erect wall
18 ... by the face (horn mouth) of suction port side
19 ... expand stream
20 ... blow-off outlet
21 ... upper side wall
22 ... lower wall
100 ... air conditioner for motor vehicle
102 ... thermostat unit
E ... scrollwork terminates portion
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described.
Fig. 1 represents the longitudinal section of the centrifugal blower 1 of first embodiment of the invention.Fig. 2 is that the A-A alignment shown in Fig. 1 looks sectional view.
The centrifugal blower 1 of present embodiment comprise as driving element electric motor 2, driven by electric motor 2 and the multiblade centrifugal fan 3 rotated, volute casing 4 and diffuser portion 5.
As shown in Figure 3, the centrifugal blower 1 of present embodiment is such as used as the blowing unit 101 of air conditioner for motor vehicle 100, and this centrifugal blower 1 is configured in outside air and switches between air door (not shown) and thermostat unit 102.
Above-mentioned electric motor 2 has the rotating shaft 6 be connected with the bump 7B described later of multiblade centrifugal fan 3, rotating shaft 6 is rotated, drives multiblade centrifugal fan 3 to rotate.
Above-mentioned multiblade centrifugal fan 3 is configured to have base plate 7, blade 8 and annular flange 9, and the axis direction of air from rotating shaft 6 is sucked and discharged towards radial outside.
Above-mentioned base plate 7 is formed with at central part the roughly cone shape tapered portion 7A that the axis direction (suction port 11 side described later) towards rotating shaft 6 swells.Be formed with bump 7B in the central authorities of above-mentioned tapered portion 7A, this bump 7B is chimeric with the rotating shaft 6 of electric motor 2.The peripheral part of base plate 7 is flange shape, and the cardinal extremity being permitted more blades (fin) 8 is separately fixed on the peripheral part of above-mentioned base plate 7.
Each above-mentioned blade 8 is configured in around rotating shaft 6, between these blades 8, guarantee the interval having regulation.In the present embodiment, each blade 8 configures towards the direction of the axis parallel with rotating shaft 6.
Above-mentioned annular flange 9 is arranged coaxially with base plate 7, and is connected and fixed by the front end of blade 8.
Above-mentioned volute casing 4 is made up of hard resin etc., and multiblade centrifugal fan 3 is received, above-mentioned volute casing 4 is configured to the vortex shape stream 12 had towards the suction port 11 of annular flange 9 one side opening and the stream as the air of discharging from multiblade centrifugal fan 3.In addition, the downstream end opening that volute casing 4 flows at the air of vortex shape stream 12, is connected with diffuser portion 5 in side, above-mentioned downstream, and is communicated with the expansion stream 19 described later in diffuser portion 5.
Specifically, volute casing 4 is formed as comprising periphery wall 13, tongue 14, upper plate 15 and the lower plate 16 that the radial direction along multiblade centrifugal fan 3 is arranged.
The helically of above-mentioned periphery wall 13 in regulation extends, and with along with increasing from the scrollwork initial part S of spiral towards the angle of the sense of rotation of multiblade centrifugal fan 3, namely along with the downstream side towards air stream, the mode that the radial distance apart from rotating shaft 6 center expands gradually is bent to form.Periphery wall 13 is connected between the outer rim of upper plate 15 with the outer rim of lower plate 16.Periphery wall 13 is formed as marking off at the radial outside of multiblade centrifugal fan 3 the above-mentioned vortex shape stream 12 spirally extended together with upper plate 15 and lower plate 16.
Above-mentioned tongue 14 is connected with the scrollwork initial part S of periphery wall 13, and towards the wall that the radial outside of volute casing 4 is bent to form.Radial distance between periphery wall 13 and multiblade centrifugal fan 3 is minimum at tongue 14 place.Tongue 14 is positioned at the upstream extremity of the air flowing of vortex shape stream 12, plays and suppresses air to terminate from the scrollwork of vortex shape stream 12 effect that portion E flows into scrollwork initial part S.
Above-mentioned upper plate 15 is positioned at annular flange 9 side, and be parallel to the wall of the plane orthogonal with the axle center of rotating shaft 6, and above-mentioned upper plate 15 offers suction port 11 in the position corresponding with multiblade centrifugal fan 3.
The upper plate 15 of the periphery of suction port 11 is formed and erects wall 17, the above-mentioned wall 17 that erects has after from upper plate 15, towards the direction separated with multiblade centrifugal fan 3, generally perpendicularly (axis direction towards rotating shaft 6) erects, to the shape turned back in suction port 11 side, this erect wall 17 by face of suction port 11 side be bell mouth shape bend.Below, above-mentioned bending part is called horn mouth 18.In addition, be formed with suction port 11 in the inner side of above-mentioned horn mouth 18, the bore of suction port 11 is set as slightly less than the internal diameter of annular flange 9.
Like this, in the present embodiment for formed at the periphery of suction port 11 erect towards the axis direction of rotating shaft 6 erect wall 17, and this face (18) by suction port 11 side erecting wall 17 is bent in bell mouth shape.In addition, for the effect of above-mentioned horn mouth 18, will be described in detail below.
Above-mentioned lower plate 16 is the walls being positioned at base plate 7 side (electric motor 2 side) and being parallel to the plane orthogonal with the axle center of rotating shaft 6.The electric motor mounting hole chimeric with the main body of electric motor 2 is formed in lower plate 16.
Above-mentioned diffuser portion 5 is configured to be had: expand stream 19, this expansion stream 19 is streams that the downstream flowed with the air of vortex shape stream 12 is communicated with, and in the mode that the sectional area of this stream expands along with the downstream side of flowing towards air, the path heights of the axis direction of rotating shaft 6 is changed; And blow-off outlet 20, the downstream-end opening that this blow-off outlet 20 flows at the air expanding stream 19.
When as in the present embodiment centrifugal blower 1 being used as blowing unit 101 of air conditioner for motor vehicle (HVAC) 100 (with reference to Fig. 3), centrifugal blower 1 (blowing unit 101) is connected with thermostat unit 102.In this case, volute casing 4 size in the height direction (size of the above-below direction in Fig. 3) is different from the housing 102a size in the height direction of thermostat unit 102, therefore, when volute casing 4 is directly connected with the housing 102a of thermostat unit 102, the pressure loss caused along with sharply expanding of flow path area can be there is.Therefore, volute casing 4 is connected with the housing 102a of thermostat unit 102 by diffuser portion 5, expands gradually to make the flow path cross sectional area of volute casing 4.In addition, for the effect in above-mentioned diffuser portion 5, will be described in detail below.
Specifically, as shown in Figures 1 and 2, diffuser portion 5 is formed as the upper side wall 21 of the wall had as suction port 11 side, the lower wall 22 relative with above-mentioned upper side wall 21, planar surface portion 23 and tangent line portion 24.In addition, diffuser portion 5 is configured to upper side wall 21 and the lower wall 22 direction inclination that court is separated from each other along with the downstream side of flowing towards air.
Above-mentioned upper side wall 21 is to be formed with the upper plate 15 continuous print mode of volute casing 4, and the direction that court and lower wall 22 are separated along with the downstream side of flowing from the assigned position of upper side wall 21 towards air tilts.The inclination initial position of above-mentioned upper side wall 21 is set in the upstream side more leaning on air flowing than the inclination initial position of lower wall 22.In the present embodiment, the scrollwork that scrollwork terminates the end of E side, portion that comprises that the inclination initial position of upper side wall 21 is positioned at volute casing terminates near portion's side end.
Above-mentioned lower wall 22 is to be formed with the lower plate 16 continuous print mode of volute casing 4, and the direction that court and upper side wall 21 separate along with the downstream side of flowing from the assigned position of lower wall 22 towards air tilts.In the present embodiment, the inclination initial position of above-mentioned lower wall 22 is positioned near the tongue comprising the position corresponding with tongue of lower wall 22.
Above-mentioned planar surface portion 23 is that the lingual side outer rim of upper side wall 21 is connected with the lingual side outer rim of lower wall 22 by above-mentioned planar surface portion 23 at the curved end place of the tongue 14 of volute casing 4 along the tangent direction of tongue 14 and tongue 14 continuous print planar wall.
Above-mentioned tangent line portion 24 is that the scrollwork of the spiral of periphery wall 13 at volute casing 4 terminates E place of portion and terminates the tangent direction of portion E along scrollwork and scrollwork terminates portion E continuous print planar wall, and the outer circumferential side outer rim of upper side wall 21 is connected with the outer circumferential side outer rim of lower wall 22 by above-mentioned tangent line portion 24.
Utilize above-mentioned upper side wall 21, lower wall 22, planar surface portion 23 and tangent line portion 24, divide the above-mentioned expansion stream 19 being formed and be communicated with vortex shape stream 12.
Then, by comparing with the common bell-mouthed situation shown in Fig. 8, the effect of the horn mouth 18 of the present embodiment shown in Fig. 4 is described.
Can confirm present embodiment as shown in Figure 4 arrange like this erect wall 17 to make the existing horn mouth height shown in aspect ratio Fig. 8 of horn mouth 18 time, the stripping of the end (annular flange 9 side) by multiblade centrifugal fan side of horn mouth 18 can be suppressed.Can expect that this is because the length of lead of the air importing in horn mouth 18 is elongated, the cause that the rectified action produced by wall attachment effect is strengthened.
In addition, by PIV (particle image velocimetry method) visualized experiment, observation is carried out to the flowing of the air of discharging from multiblade centrifugal fan 3 in volute casing 4 and diffuser portion 5, if improve the height erecting wall 17, then from the velocity flow profile homogenization of air that multiblade centrifugal fan 3 is discharged, and towards flow direction lower plate 16 side, so extreme deflection shown in Fig. 8 reduces.Can expect that this is the length of lead owing to being increased air by the height of raising horn mouth 18, the rectified action of horn mouth 18 is strengthened, consequently, along horn mouth 18 flow air after flowing in multiblade centrifugal fan 3 through suction port 11, attracted by the radial outside to multiblade centrifugal fan 3, changing towards than the easier radial outside to multiblade centrifugal fan 3 of the existing horn mouth shown in Fig. 8 of flowing at once.
In the present embodiment, by " the periphery of suction port 11 formed erect towards the axis direction of rotating shaft 6 erect wall 17; and make the face by suction port 11 side erecting wall 17 be the structure (namely; make the horn mouth 18 after the length of lead growth of air) that bends of bell mouth shape ground ", make the flow velocity of the air from multiblade centrifugal fan 3 discharge, distribution uniformity on the axis direction of rotating shaft 6.In addition, in the present embodiment, above-mentioned " horn mouth 18 after the length of lead of air is increased " is equivalent to " distribution uniformity element " of the present invention.
In addition, when the height improving horn mouth 18 as mentioned above like this increases the length of lead of air, although there is no the extreme deflection of existing flow direction as shown in Figure 8, as shown in Figure 4, the flow direction of air is partial to slightly towards upper plate 15 side sometimes.
Then, for the flow direction of air as shown in Figure 4 towards the situation that upper plate 15 side is partial to slightly, the effect in the diffuser portion 5 of present embodiment is described.
Arrive via vortex shape stream 12 air that scrollwork terminates portion E, the inclination being first imported into the upper side wall 21 expanding stream 19 starts in region.Now, the flow velocity towards the air of upper side wall 21 side flowing reduces.By this, the pressure loss caused because of collision with upper side wall 21 etc. is suppressed.On the other hand, the inclination beginning of lower wall 22 is positioned at than upper side wall 21 more by the position in the downstream side of air flowing, therefore, suppresses to produce stagnant areas at lower wall 22 place.In addition, when the region that the wall 21,22 that air flows to the both sides up and down expanding stream 19 tilts, the kinetic energy of above-mentioned air flowing can be effectively converted to pressure energy to improve static pressure, thus sends the higher air of static pressure from the blow-off outlet 20 of centrifugal blower 1 towards thermostat unit 102.
Then, with reference to Fig. 3, the schematic construction of the air conditioner for motor vehicle 100 of present embodiment and action are described.
Above-mentioned air conditioner for motor vehicle 100 is configured to comprise: the blowing unit 101 be made up of centrifugal blower 1; And thermostat unit 102, this thermostat unit 102 utilizes the temperature of heat exchanger (not shown) to the air that the diffuser portion 5 from blowing unit 101 (centrifugal blower 1) blows to regulate, and is blown out to car indoor.After the operation air conditioner for motor vehicle 100 such as the operation panel by car indoor start, air conditioner for motor vehicle 100 pairs of centrifugal blowers 1 drive, the air imported switching air door via not shown outside air from suction port 11, in diffuser portion 5, improve static pressure, and air-supply is in the housing 102a of thermostat unit 102.Now, even if such as lose at thermostat unit 102 and being under pressure in pipeline between the outlet in car etc., also the static pressure of air can improve, until can by final, in the air air-supply of the air quantity required to the outlet port in car under the state of the level in car, air is blown in housing 102a from blow-off outlet 20.In addition, thermostat unit 102 is regulated the temperature of air in a heat exchanger according to the temperature set by operation panel etc., and air-supply is in car.
Centrifugal blower 1 according to the present embodiment and comprise the air conditioner for motor vehicle 100 of this centrifugal blower 1, the distribution uniformity element of the velocity flow profile homogenization of the air of discharging from multiblade centrifugal fan 3 (horn mouth 18 after the length of lead of air is increased) is made owing to being formed as comprising, and make the structure that the upper side wall 21 in diffuser portion 5 tilts from the upstream side of air flowing is more leaned in the inclination initial position of the lower wall 22 than diffuser portion 5, therefore, distribution uniformity element (horn mouth 18 after the length of lead of air is increased) can be utilized to make velocity flow profile homogenization, consequently, even the air of discharging from multiblade centrifugal fan 3 be flowing in the state of being partial in the direction towards upper plate 15 side (suction port 11 side) of volute casing 4 when arriving the expansion stream 19 in diffuser portion 5, earlier inclination is expanded than lower wall 22 owing to making upper side wall 21, therefore, the flow velocity of the air of flowing near upper side wall 21 can be made, decline quickly than the flow velocity of the air of flowing near lower wall 22, and can effectively reduce because of and the friction of flowing with the air that upper side wall 21 collides etc. and the pressure loss caused.
In addition, such as, under the state of being partial to towards the direction of upper side wall 21 at the air-flow of air, when making upper side wall 21 in the position identical with lower wall 22 or starting to tilt in the position in the downstream side more leaning on air to flow than lower wall 22, easily near lower wall 22, produce stagnant areas, consequently, be under pressure loss, but in the centrifugal blower 1 of present embodiment, start to tilt in the position of the upstream side, inclination initial position than lower wall 22 owing to making upper side wall 21, therefore, also effectively the pressure loss can be reduced in this.
Like this, the structure of distribution uniformity element (horn mouth 18 after making the length of lead of air increase) comprising the velocity flow profile homogenization making the air of discharging from multiblade centrifugal fan 3, even if the flowing of air is partial to towards the direction of upper side wall 21, also the pressure loss caused by above-mentioned deflection can be effectively reduced in diffuser portion 5, thus effectively air quantity can be improved.
Then, the centrifugal blower 1 of second embodiment of the invention is described.
Fig. 5 represents the longitudinal section of the centrifugal blower 1 of second embodiment of the invention.In addition, for the key element identical with the first mode of execution, mark identical symbol and omit the description, only the part different from the first mode of execution being described.
In this second embodiment, multiblade centrifugal fan 3 with its external diameter along with the mode increased towards suction port 11 side is formed as rounding frustum shape.Such as, as shown in Figure 6 (dotted line represent the first mode of execution blade 8, annular flange 9, erect wall 17 and horn mouth 18), the external diameter by base plate 7 side of multiblade centrifugal fan 3 is formed as identical with the first mode of execution, and the external diameter by annular flange 9 side of multiblade centrifugal fan 3 is formed as larger than the first mode of execution.Correspondingly, the internal diameter of annular flange 9 and horn mouth 18 and external diameter also increase.
If the known external diameter increasing the multiblade centrifugal fan 3 by suction port 11 side as in the present embodiment in the multiblade centrifugal fan 3 of rounding frustum shape, then with adopt drum multiblade centrifugal fan 3 the first mode of execution (with reference to Fig. 4) situation compared with, can make the flow velocity of the air of discharging from multiblade centrifugal fan 3, distribution homogenization more on the axis direction of rotating shaft 6.Can expect that this is due to the external diameter by annular flange 9 side (by suction port 11 side) of blade 8 is formed as larger than the external diameter of the first mode of execution, thus make blade 8 improve in the attraction force by suction port 11 side, correspondingly can make the cause of the velocity flow profile homogenization of suction port 11 side.
In addition, known after carry out PIV visualized experiment in the same manner as the first mode of execution, air stream from the air that above-mentioned multiblade centrifugal fan is discharged, that flow to the lower plate side of volute casing reduces to some extent compared with the situation of the first mode of execution.Can expect that this is the multiblade centrifugal fan 3 owing to utilizing rounding frustum shape, make the cause of velocity flow profile homogenization more.
In the present embodiment, as described above by " horn mouth 18 after making the length of lead of air increase " and " making the external diameter of multiblade centrifugal fan 3 along with the structure (namely; the multiblade centrifugal fan 3 of rounding frustum shape) increased towards suction port 11 side ", make the flow velocity of the air from multiblade centrifugal fan 3 discharge, distribution homogenization more on the axis direction of rotating shaft 6.In addition, in the present embodiment, except " horn mouth 18 after making the length of lead of air increase ", above-mentioned " the multiblade centrifugal fan 3 of rounding frustum shape " is also equivalent to " distribution uniformity element " of the present invention.
In addition, when the external diameter by suction port 11 side of the multiblade centrifugal fan 3 making rounding frustum shape as in the present embodiment increases, although there is no the extreme deflection of existing flow direction as shown in Figure 8, but the situation that the flow direction that as shown in Figure 6, there is air is partial to slightly towards upper plate 15 side.
Then, for the flow direction of air as shown in Figure 6 towards the situation that upper plate 15 side is partial to slightly, the effect in the diffuser portion 5 of present embodiment is described.
Centrifugal blower 1 according to the present embodiment, compared with the centrifugal blower 1 of the first mode of execution, can make the flow velocity of the air of discharging from multiblade centrifugal fan 3, distribution homogenization more on the axis direction of rotating shaft 6.In addition, " horn mouth 18 after the length of lead of air is increased " and " the multiblade centrifugal fan 3 of rounding frustum shape " are used as the structure of the distribution uniformity element of the velocity flow profile homogenization making the air of discharging from multiblade centrifugal fan 3 comprising, in the same manner as the first mode of execution, even if the flowing of air is partial to towards the direction of upper side wall 21, also in diffuser portion 5, effectively can reduce the pressure loss because above-mentioned deflection causes, thus effectively can improve air quantity.
Then, the centrifugal blower 1 of third embodiment of the invention is described.
Fig. 7 represents the stereogram of the centrifugal blower 1 of third embodiment of the invention.In addition, for the key element identical with the second mode of execution, mark identical symbol and omit the description, only the part different from the second mode of execution being described.
In the present embodiment, volute casing 4 is for being formed obliquely the structure of upper plate 15 in the mode making the path heights of the vortex shape stream 12 on the axis direction of rotating shaft 6 expand along with the downstream side of flowing towards air.In addition, the angle of inclination of the upper side wall 21 in diffuser portion 5 is formed as larger than the angle of inclination of upper plate 15.By this, volute casing 4 itself can be made also to play the effect of diffuser, and more effectively can suppress the pressure loss, compared with the centrifugal blower 1 of the second mode of execution, more effectively can improve air quantity.In addition, in the centrifugal blower 1 of the first mode of execution, also can apply the volute casing 4 of present embodiment.In this case, compared with the centrifugal blower 1 of the first mode of execution, also more effectively can improve air quantity.
In addition, as the flow velocity for making the air of discharging from multiblade centrifugal fan 3, the structure (distribution uniformity element) of the distribution uniformity on the axis direction of rotating shaft 6, in the above-described first embodiment, " what erect at the periphery of suction port 11 axis direction be formed towards rotating shaft 6 erects wall 17 in application, and the face by suction port 11 side making to erect wall 17 be the structure (making the horn mouth 18 after the length of lead growth of air) that bends of bell mouth shape ground ", in the second mode of execution and the 3rd mode of execution, except application " should make the horn mouth 18 after the length of lead growth of air ", also apply " making the external diameter of multiblade centrifugal fan 3 along with the structure (the multiblade centrifugal fan 3 of rounding frustum shape) increased towards suction port 11 side ", but " distribution uniformity element " is not limited to this, also can be the situation being configured to the multiblade centrifugal fan 3 only comprising rounding frustum shape.As long as distribution uniformity element comprises such as " what erect at the periphery of suction port 11 axis direction be formed towards rotating shaft 6 erects wall 17, and makes the face by suction port 11 side erecting wall 17 be the structure that bends of bell mouth shape ground " and the structure of at least one party in " making the external diameter of multiblade centrifugal fan 3 along with the structure increased towards suction port 11 side ".
In addition, in the respective embodiments described above, the inclination initial position of upper side wall 21 is that the scrollwork that scrollwork terminates the end of E side, portion that comprises of volute casing 4 terminates near portion's side end, but the present invention is not limited to this, as long as be positioned at the position more leaning on the upstream side of air flowing than the inclination initial position of lower wall 22, then it can be arbitrary position.In addition, the inclination initial position of lower wall 22 is near the tongue of that comprise upper side wall 21, corresponding with tongue 14 position, but the present invention is not limited to this, as long as be positioned at the position more leaning on the downstream side of air flowing than the inclination initial position of upper side wall 21, then can be arbitrary position.
In addition, in the respective embodiments described above, electric motor 2 is comprised to centrifugal blower 1 and is illustrated as the situation of driving source, but centrifugal blower 1 also can not comprise electric motor 2.
In addition, for the centrifugal blower 1 of the variation of above-mentioned second mode of execution, the 3rd mode of execution and these mode of executions, the blowing unit 101 of air conditioner for motor vehicle 100 also can be used as.In addition, centrifugal blower 1 is not limited to the blowing unit 101 of air conditioner for motor vehicle 100, can be used as the blowing unit needing to carry out the appropriate device of blowing.
Above, with reference to preferred embodiment illustrating content of the present invention, but to those skilled in the art, based on basic fundamental design of the present invention and instruction, can adopt various deformation forms further, this point is self-evident.
Claims (7)
1. a centrifugal blower, comprising:
Multiblade centrifugal fan, this multiblade centrifugal fan has to be configured in and turns an axial multiple blade, and air intake is discharged to radial outside from the axis direction of described rotating shaft by described multiblade centrifugal fan;
Volute casing, this volute casing is received described multiblade centrifugal fan, and has the vortex shape stream using the suction port of described air intake and the stream as the air of discharging from described multiblade centrifugal fan; And
Diffuser portion, this diffuser portion has expansion stream and blow-off outlet, wherein, described expansion stream is the stream that the downstream flowed with the air of described vortex shape stream is communicated with, and change to make the path heights of the axis direction of described rotating shaft in the mode making the sectional area of described stream expand along with the downstream side of flowing towards air, the downstream-end opening that described blow-off outlet flows at the air of described expansion stream
It is characterized in that,
Described centrifugal blower has the distribution uniformity element of that make the flow velocity of the air of discharging from described multiblade centrifugal fan, on the axis direction of described rotating shaft distribution uniformity,
Described diffuser portion makes the upper side wall of described suction port side and the lower wall relative with this upper side wall along with the downstream side of flowing towards air towards the structure that the direction be separated from each other tilts,
The inclination initial position of described upper side wall is arranged on the position more leaning on the upstream side of air flowing than the inclination initial position of described lower wall.
2. centrifugal blower as claimed in claim 1, is characterized in that,
Described distribution uniformity element is configured to comprise following structure: what erect at the periphery of the described suction port axis direction be formed towards described rotating shaft erects wall, and make this face by described suction port side erecting wall be bell mouth shape bend.
3. centrifugal blower as claimed in claim 1, is characterized in that,
Described distribution uniformity element is configured to comprise following structure: the external diameter of described multiblade centrifugal fan is increased along with towards described suction port side.
4. centrifugal blower as claimed in claim 1, is characterized in that,
The inclination initial position of described upper side wall be positioned at described volute casing, comprise the scrollwork that scrollwork terminates the end of side, portion and terminate near portion's side end.
5. centrifugal blower as claimed in claim 4, is characterized in that,
Described volute casing is formed as the structure with tongue, and this tongue suppresses air to terminate portion to the inflow of scrollwork initial part from the scrollwork of described vortex shape stream,
Near tongue that the inclination initial position of described lower wall is positioned at described lower wall, that comprise the position corresponding with tongue.
6. centrifugal blower as claimed in claim 1, is characterized in that,
Described volute casing is make the path heights of the described vortex shape stream on the axis direction of described rotating shaft be tilted with the structure of the wall by described suction port side along with the mode that the downstream side of flowing towards air expands,
The angle of inclination of the described upper side wall in described diffuser portion is larger than the angle of inclination of the wall by described suction port side of described volute casing.
7. an air conditioner for motor vehicle, is characterized in that, comprising:
Centrifugal blower according to claim 1; And
Thermostat unit, this thermostat unit utilizes the temperature of heat exchanger to the air that the described diffuser portion from described centrifugal blower sends to regulate, and is blown out to car indoor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-157357 | 2013-07-30 | ||
| JP2013157357A JP6143596B2 (en) | 2013-07-30 | 2013-07-30 | Centrifugal blower and vehicle air conditioner equipped with the centrifugal blower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104343727A true CN104343727A (en) | 2015-02-11 |
| CN104343727B CN104343727B (en) | 2017-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410365807.5A Active CN104343727B (en) | 2013-07-30 | 2014-07-29 | Centrifugal air blower and vehicle-mounting air-conditioning apparatus comprising same |
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| JP (1) | JP6143596B2 (en) |
| CN (1) | CN104343727B (en) |
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| CN106427474A (en) * | 2016-11-09 | 2017-02-22 | 珠海格力电器股份有限公司 | Passenger car and vehicle-mounted air conditioner thereof |
| CN107615566A (en) * | 2015-09-14 | 2018-01-19 | 松下知识产权经营株式会社 | Thermostat unit, humidity control system, vehicle |
| CN108869407A (en) * | 2018-06-20 | 2018-11-23 | 广东美的白色家电技术创新中心有限公司 | A kind of air exhaust muffler device and household appliance |
| CN110621521A (en) * | 2017-05-22 | 2019-12-27 | 翰昂汽车零部件有限公司 | Blower unit of air conditioner for vehicle |
| TWI687596B (en) * | 2017-10-27 | 2020-03-11 | 日商三菱電機股份有限公司 | Centrifugal blower, air supply device, air conditioning device and refrigeration cycle device |
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| CN114555952A (en) * | 2019-10-30 | 2022-05-27 | 日立环球生活方案株式会社 | Electric blower and electric dust collector with the same |
| CN114630964A (en) * | 2019-10-21 | 2022-06-14 | 株式会社电装 | Air blower |
| WO2023010958A1 (en) * | 2021-08-04 | 2023-02-09 | 珠海格力节能环保制冷技术研究中心有限公司 | Centrifugal fan blade, fan and air conditioning system |
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| CN113906221A (en) * | 2019-06-13 | 2022-01-07 | 三菱电机株式会社 | Centrifugal blower, air conditioner, and refrigeration cycle device |
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| CN113294211B (en) * | 2021-05-20 | 2024-05-31 | 中齐能源科技有限公司 | Micro-pressure air energy recovery device |
| WO2023010958A1 (en) * | 2021-08-04 | 2023-02-09 | 珠海格力节能环保制冷技术研究中心有限公司 | Centrifugal fan blade, fan and air conditioning system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104343727B (en) | 2017-04-12 |
| JP2015028299A (en) | 2015-02-12 |
| JP6143596B2 (en) | 2017-06-07 |
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