CN1282853C

CN1282853C - Indoor unit and air conditioner

Info

Publication number: CN1282853C
Application number: CN02107491.7A
Authority: CN
Inventors: 铃木一弘; 泉元; 末永洁; 近藤文男; 冈田有二; 前野政司; 宫泽贤一; 冨永哲雄
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Air Conditioning and Refrigeration Systems Corp
Priority date: 2001-03-23
Filing date: 2002-03-20
Publication date: 2006-11-01
Anticipated expiration: 2022-03-20
Also published as: CN1376878A; EP1243864B1; ES2291387T3; DE60222823D1; EP1243864A3; ATE375483T1; EP1243864A2

Abstract

In an indoor unit, when the fan diameter of a tangential fan (14) is taken to be D, and the width of the intake diaphragm provided on the upstream side of the inlet of an air duct (40) inside the casing is taken to be f, f/D is within the range of 0.002 to 0.003 (0.002 <= f/D </= 0.003). In addition, when the width of the outlet of an air duct (40) formed between the outer peripheral surface (14a) of a tangential fan (14) and the air duct wall surface (41) of the casing is taken to be Wo, Wo/D is 0.55 or less (Wo/D <= 0.55). In addition, when a line extending in the direction of flow along the upper surface that forms the discharge port serving as the air duct outlet in the casing is taken to be a, the stabilizer tongue end angle alpha , which is formed between the surface of the stabilizer opposing tangential fan (14) and the extended line a, is within the range of 50 DEGREE to 60 DEGREE (50 DEGREE <= alpha <=60 DEGREE). In addition, when the distance between the extended line a and a tangent b of the fan diameter D parallel to said extended line a is taken to be d, d/D is within the range of -0.2 to 0.2 (-0.2 <= d/D <= 0.2).

Description

Indoor set and air-conditioner

Technical field

The present invention relates to a kind ofly by refrigeration or heat the indoor set and the air-conditioner of the indoor environment that provides comfortable, particularly relate to used suitable technology in the indoor set of the running noises that the air-supply system that can reduce the indoor set that adopts tangential fan produced and the air-conditioner.

Background technology

Air conditioner is by indoor set and such 2 the big component parts of off-premises station.Each several part has between cold-producing medium and the room air and the indoor heat converter and the outdoor heat converter that carry out heat exchange between cold-producing medium and the outdoor gas.

These indoor heat converters and outdoor heat converter are for constituting the key element of refrigerant loop with key elements such as in addition compressor, expansion valves.Cold-producing medium is by carry out physics circulation in this loop, even be in hot state, also can realize indoor refrigeration by the cyclic process of the state variation of high temperature and high pressure gas, low-temp low-pressure gas, high temperature high pressure liquid, low-temp low-pressure liquid.This indoor refrigeration is directly realized by the heat exchange of cold-producing medium in the indoor heat converter and room air.

During heating operation, will pass out to indoor heat converter, and between this cold-producing medium and room air, carry out heat exchange, thereby make condensation of refrigerant, realize the liquid refrigerating thinner of HTHP by the gas refrigerant that compressor forms high temperature and high pressure gas.In addition, during refrigerating operaton, the gas refrigerant of HTHP is passed out to outdoor heat converter, carry out heat exchange, form the liquid refrigerant of HTHP with outdoor gas.Afterwards, the liquid refrigerant of HTHP is reduced pressure it by expansion valve, form the liquid refrigerant of low-temp low-pressure, pass out to indoor heat converter, between this cold-producing medium and room air, carry out heat exchange, thereby make the cold-producing medium evaporation, realize the aerification of low-temp low-pressure.

, in the occasion of above-mentioned air-conditioner, the shell shape of indoor set is actually rule of thumb in the past and decides.For for example using and extensively universal air-conditioner in such air-conditioner, be located at the general in the past tangential fan (cross flow fan) that adopts of fan in the indoor set as family.

In this occasion, after the room air that is attracted by tangential fan (to call " fan " in the following text) is subjected to air-conditioning and handles by indoor heat converter, by be formed at air channel between fan outer peripheral face and the shell air channel wall from blow-off outlet towards indoor air-supply.In such indoor set,,, further improve the commodity of air-conditioner preferably by air quantity and the such aerodynamic performance face of noise are further improved for the system of the fan air-supply in the shells such as stabilising arrangement shape of being located at air channel shape and fan upstream side.

From such background, need find out and be used to make the air of air channel shape, stabilising arrangement shape, fan air-supply system to flow into optimized basic laws such as discharge form, design according to this rule, can realize easily blowing be low noiseization and high efficiency with shell shape.

Summary of the invention

The present invention In view of the foregoing makes, its purpose is to provide a kind of index, according to this index, design easily so that be formed at the shape of the air-supply system in the indoor machine of air-conditioner and particularly be located at the inflow of the air of shape that the air of inlet top, air channel flows into rear wall parts, fan air-supply system and discharge form, and stabilising arrangement shape optimization, improve aerodynamic quality.

The invention provides to have and be used for sucking room air and, providing following formation in order to address the above problem with its tangential fan that blows out from blow-off outlet, at above-mentioned room air and indoor set control part that constitutes from the indoor heat converter that carries out heat exchange between the cold-producing medium of off-premises station supply, by various components and the indoor set of accommodating the shell of these each equipment from suction inlet.

Promptly, the 1st aspect of the present invention is characterised in that: be made as D as the fan diameter with above-mentioned tangential fan, the suction throttle orifice width of being located at the air channel inlet upstream side in the above-mentioned shell is made as f, and then f/D is in 0.02～0.03 scope interior (0.02≤f/D≤0.03).

According to such indoor set, be 0.02≤f/D≤when 0.03 ground designs making f/D, can realize the low noiseization of the fan air-supply system under the same air quantity.

The 2nd aspect of the present invention is characterised in that: the fan diameter as above-mentioned tangential fan is D, and the counter-rotating portion width of being located at the inflow air stream of the air channel inlet upstream side in the above-mentioned shell is g, and then g/D is more than 0.06 (0.06≤g/D).

According to such indoor set, be that 0.06≤g/D ground designs by making g/D, can realize the low noiseization of the fan air-supply system under the same air quantity.

The 3rd aspect of the present invention is characterised in that: the fan diameter as above-mentioned tangential fan is D, the suction entrance length of being located at the air channel inlet upstream side in the above-mentioned shell is e, sucking the throttling angle of spot hole is γ, then e/D is in 0.25～0.3 scope interior (0.25≤e/D≤0.3), and γ is in the scopes interior (80 degree≤γ≤90 degree) of 80 degree～90 degree.

According to such indoor set, be that 0.25≤e/D≤0.3 and γ are that 80 degree≤γ≤90 degree ground design by making e/D, can realize the low noiseization of the fan air-supply system under the same air quantity.

In addition, also can in an indoor set, make up and design aspect the above-mentioned 1-the 3rd.

According to such indoor set, can realize the further low noiseization of the fan air-supply system under the identical air quantity by mutual effect stack.

In addition, aspect the 2nd in, also can form recess at the face that forms the above-mentioned counter-rotating width g of portion.

According to such indoor set,, also can prevent the generation of the strain that when being shaped, causes by thermal stress even low noiseization is advantageously increased the value (wall thickening) of the width g of counter-rotating portion.

The 4th aspect of the present invention is characterised in that: the fan diameter as above-mentioned tangential fan is D, the exit width that is formed at the air channel between the air channel wall of the outer peripheral face of above-mentioned tangential fan and above-mentioned shell is Wo, and Wo/D is being designed below 0.55 (Wo/D≤0.55).

According to such indoor set, the ratio that makes the relative fan diameter D of outlet width W o is Wo/D≤0.55 ground design, can realize the low noiseization of the fan air-supply system under the same air quantity.

The 5th aspect of the present invention is characterised in that: the upstream open angle θ 2 that becomes negative pressure region in the air inflow side of above-mentioned tangential fan is designed more than 180 degree (θ 2 〉=180 degree).

According to such indoor set, make the upstream open angle θ 2 that becomes negative pressure region in the air inflow side of above-mentioned tangential fan be θ 2 〉=design in 180 degree, can realize the low noiseization of the fan air-supply system under the same air quantity.

In addition, the above-mentioned the 4th and the 5th aspect also can be in an indoor set Combination Design.

Indoor set after this manner can be realized the further low noiseization of the fan air-supply system of same air quantity by mutual effect stack.

The 6th aspect of the present invention is characterised in that: the fan diameter as above-mentioned tangential fan is D, the formation ducting outlet is that the extended line of upper side on flow direction of outlet is a in above-mentioned shell, then makes the stabilising arrangement tongue end angle [alpha] that is become with above-mentioned extended line a with the face of above-mentioned tangential fan stabilising arrangement in opposite directions be in 50 and spends (50 degree≤α≤60 degree) in～60 scopes of spending.

According to such indoor set, be 50 degree≤α≤60 degree ground designs by making stabilising arrangement tongue end angle [alpha], can realize the low noiseization of the fan air-supply system under the same air quantity.

The 7th aspect of the present invention is characterised in that: the fan diameter as above-mentioned tangential fan is D, the actual height of being located at the stabilising arrangement of above-mentioned tangential fan upstream side is h, and the ratio of the relative said fans diameter of the actual height h D of stabilising arrangement is being designed below 25% (h/D≤25%).

According to such indoor set, the ratio of the relative fan diameter D of actual height h by making stabilising arrangement is h/D≤25% ground design, can realize the low noiseization that the fan air-supply same air quantity under is.

The 8th aspect of the present invention is characterised in that: the room air inflow part at the stabilising arrangement of being located at above-mentioned tangential fan upstream side is provided with the ways that guides above-mentioned indoor air stream towards the cardinal principle center position of above-mentioned tangential fan.

According to such indoor set, owing to flow into the ways that partly is provided with towards the cardinal principle center position guiding indoor air stream of tangential fan at the room air of stabilising arrangement, so, can realize the low noiseization of the fan air-supply system under the same air quantity.

In addition, also can in an indoor set, make up and design aspect the above-mentioned 6-the 8th.

The 9th aspect of the present invention is characterised in that: the fan diameter as above-mentioned tangential fan is D, the upper side that forms ducting outlet and be outlet in above-mentioned shell is d in the distance of the extended line a of flow direction and the tangent line b of the said fans diameter D that is parallel to this extended line a, and d/D is in-0.2～0.2 the scope (0.2≤d/D≤0.2).

In this occasion, extended line a is preferably in align on the same straight line (d/D=0) with tangent line b.

According to such indoor set, be-0.2≤d/D≤0.2 ground design by what make fan diameter D and extended line a and tangent line b apart from d, can realize the low noiseization of the fan air-supply system under the same air quantity.

The 10th aspect of the present invention is characterised in that: the fan diameter as above-mentioned tangential fan is D, the extended line of upper side on flow direction that forms ducting outlet in the enclosure and be outlet is a, with the tangent line of the parallel or consistent said fans diameter D of this extended line a is b, and then the downstream opening angle θ 1 that constitutes with the line of above-mentioned tangent line b orthogonal and the line by the C of fan center and starting point K by the shell coiling and the C of fan center is in the scopes of 115 degree～125 degree (115 degree≤θ 1≤125 spend).

According to such indoor set, be 115 degree≤θ, 1≤125 degree ground designs by making downstream opening angle θ 1, can realize the low noiseization of the fan air-supply system under the same air quantity.

The 11st aspect of the present invention is characterised in that: be formed at that air channel width W between above-mentioned tangential fan outer peripheral face and the above-mentioned shell air channel wall has the expansion line part of outlet side and the curve part ground of entrance side changes, this expansion line part is increased to exit width Wo pro rata from the length of run of starting point opposite shell air channel center line, and this curve part increases lentamente and links to each other with above-mentioned expansion line part from the throat width Wi that becomes above-mentioned starting point.

According to such indoor set, because design makes the air channel width W have the expansion line part of outlet side and the curve part ground of entrance side changes, this expansion line part is increased to exit width Wo pro rata from the length of run of starting point opposite shell air channel center line, this curve part increases lentamente and links to each other with above-mentioned expansion line part from the throat width Wi that becomes above-mentioned starting point, thereby can realize the low noiseization of the fan air-supply system under the same air quantity.

The 12nd aspect of the present invention is characterised in that: for the air channel width W that is formed between above-mentioned tangential fan outer peripheral face and the above-mentioned shell air channel wall, diameter as above-mentioned tangential fan is D, and then making becomes in 0.7%～0.8% the scope that the throat width of starting point Wi is in said fans diameter D (0.7%≤Wi/D≤0.8%).

According to such indoor set, be 0.7%≤Wi/D≤0.8% ground design by the ratio that makes the relative fan diameter D of throat width Wi, can realize the low noiseization of the fan air-supply system under the same air quantity.

In addition, also can in an indoor set, make up and design aspect the above-mentioned 9-the 12nd.

In addition, the present invention also provides the air-conditioner with off-premises station and above-mentioned indoor set, and this off-premises station comprises outdoor heat converter, the gas refrigerant of HTHP passed out to compressor, and the off-premises station control part that is made of various components of heat exchanger.

According to such air-conditioner, owing to have the indoor set that can easily realize the low noiseization under the identical air quantity, so, can provide the aerodynamic quality best possible merchandise high air-conditioner.

Indoor set and air-conditioner according to the invention described above, the running noises of the fan air-supply system of indoor set can be compared with prior art reduced significantly and easily, the remarkable result of commodity can be obtained to improve as the low noiseization of the air-conditioner of inscape by indoor set with it.

Description of drawings

Fig. 1 is the local section perspective view that a form of implementation of indoor set of the present invention and air-conditioner is shown.

Fig. 2 illustrates the tangential fan of indoor set of the present invention and the 1st form of implementation of air-supply system thereof, for the A-A of Fig. 1 to looking the section face.

Fig. 3 is illustrated in the present invention's the 1st form of implementation the result who detects with respect to the noise ratio that sucks throttle orifice width f and fan diameter D, on the same air quantity basis.

Fig. 4 is illustrated in the present invention's the 2nd form of implementation the result who detects with respect to the noise ratio of width g of counter-rotating portion and fan diameter D, on the same air quantity basis.

Fig. 5 is illustrated in the present invention's the 3rd form of implementation the result who detects with respect to the noise ratio that sucks entrance length e and fan diameter D, on the same air quantity basis.

Fig. 6 is illustrated in the present invention's the 3rd form of implementation the result who detects with respect to sucking noise throttling angle of spot hole γ, on the same air quantity basis.

Fig. 7 be illustrate counter-rotating of the present invention portion shape a modified example want portion's sectional drawing.

Fig. 8 illustrates the tangential fan of indoor set of the present invention and the 4th form of implementation of air-supply system thereof, for the A-A of Fig. 1 to looking sectional drawing.

Fig. 9 is illustrated in the present invention's the 4th form of implementation the result who detects with respect to the noise ratio of exit width Wo and fan diameter D, on the same air quantity basis.

Figure 10 is illustrated in the present invention's the 5th form of implementation the result who detects with respect to noise upstream open angle θ 2, on the same air quantity basis.

Figure 11 A illustrates an example of the leading section shape of stabilising arrangement, is the figure of the stabilising arrangement of the mountain valley shape seen from fan side.

Figure 11 B illustrates an example of the leading section shape of stabilising arrangement, is the figure of the stabilising arrangement of the rectilinear form seen from fan side.

Figure 12 illustrates the tangential fan of indoor set of the present invention and the 6th form of implementation of air-supply system thereof, for the A-A of Fig. 1 to looking the section face.

Figure 13 is illustrated in the present invention's the 6th form of implementation the result who detects with respect to noise stabilising arrangement tongue end angle [alpha], on the same air quantity basis.

Figure 14 is illustrated in the present invention's the 7th form of implementation the result who detects with respect to the noise ratio of the actual height h of stabilising arrangement and fan diameter D, on the same air quantity basis.

Figure 15 A illustrates an example of the leading section shape of stabilising arrangement, is the figure of the stabilising arrangement of the mountain valley shape seen from fan side.

Figure 15 B illustrates an example of the leading section shape of stabilising arrangement, is the figure of the stabilising arrangement of the rectilinear form seen from fan side.

Figure 16 be illustrated in the present invention's the 8th form of implementation by having or not of ways measure and more identical air quantity basis on the result of noise.

Figure 17 illustrates the tangential fan of indoor set of the present invention and the 9th form of implementation of air-supply system thereof, for the A-A of Fig. 1 to looking sectional drawing.

Figure 18 is the figure that is used to illustrate the effect of the present invention's the 9th form of implementation, detection is shown with respect to the result apart from the noise ratio of d and fan diameter D, on the same air quantity basis between extended line a and the tangent line b.

Figure 19 is illustrated in the present invention's the 10th form of implementation the result who detects with respect to noise downstream opening angle θ 1, on the same air quantity basis.

Figure 20 is illustrated in the present invention's the 11st form of implementation the air channel width W with respect to the figure of the version (3 kinds) of the length of run L of shell air channel center line.

Figure 21 illustrates the result of the version that detects with the air channel width of Figure 20 noise corresponding, on the identical air quantity basis.

Figure 22 is the figure that is used for illustrating the shape of the air channel width W of determining in the 11st form of implementation, and the figure of the relation of the length of run L of shell air channel center line and air channel width W is shown.

Figure 23 is the figure that is used to illustrate the effect of the present invention's the 11st form of implementation, and the result of detection with respect to the noise throat width Wi in air channel, on the same air quantity basis is shown.

The specific embodiment

Indoor set of the present invention and air-conditioner form of implementation are described with reference to the accompanying drawings.

Fig. 1 is the key diagram that all formations of air-conditioner are shown.Air-conditioner is made of indoor set 10 and off-premises station 20.The refrigerant piping 21 that these indoor sets 10 and off-premises station 20 are flow through by cold-producing medium is connected with not shown electric wiring etc.Refrigerant piping 21 is provided with 2, and cold-producing medium flows to off-premises station 20 in one side from indoor set 10, in addition, the opposing party, flows to indoor set 10 from off-premises station 20.

Indoor set 10 constitutes integratedly as the support 11 of shell and front panel 12.Be provided with the indoor heat converter 13 and tangential fan (to call " fan " in the following text) 14 various devices such as grade that are roughly drum of plate shape fin tube type at support 11.Also be provided with the indoor set control part 15 that constitutes by various components etc. at support 11, to carry out the relevant exercises control of indoor set 10 etc.Be provided with the suitable indicator 15a that is used to show the operation conditions and (エラ) pattern of makeing mistakes at indoor set control part 15.This indicator 15a can be confirmed from visual observation by the 12a of perspective portion that is located at front panel 12.Be provided with installing plate 16 at the rear of support 11, indoor set 10 can be arranged at indoor wall etc. thus.

Plate 12 sucks grid (suction inlet) 12b respectively at front and top formation in front.Indoor air sucks grid 12b by these and is drawn in the indoor set 10 from a plurality of directions.Have air cleaner 17 in the behind that sucks grid 12b, play the effect of the dust of removing inhaled air etc.In addition, the below of plate 12 forms blow-off outlet 12c in front, and air or cooled air (being Air Conditioning) after will heating here blow out.This air suction and air blow out by the revolution of fan 14 and are undertaken.

Above-mentioned indoor set 10 has remote controller 30, as the operating portion that carries out various operations.Be provided with various switches and liquid crystal display part etc. at this remote controller 30, the various operation signals of air-conditioner and design temperature etc. for example can be sent to the signal receiving part (omitting among the figure) of indoor set control part 15 as infrared signal.The operation of air-conditioner also can be implemented a part by the not shown switch of being located at the indoor set suitable position.

Outdoor heat converter 20b, propeller type fan 20c, compressor 20f are set in the casing 20a of off-premises station 20, reach off-premises station control part 20g etc.Outdoor heat converter 20b is made of the refrigerant piping that has a plurality of plate-shaped fins around, is used to realize the heat exchange of cold-producing medium and outdoor air.Propeller type fan 20c is taken into fresh air in the casing 20a often by produce the air stream that flows to the front from the back side in casing 20a, thereby improves the heat exchanger effectiveness of outdoor heat converter 20b.

The face of the casing 20a that faces toward towards the outside at above-mentioned outdoor heat converter 20b and propeller type fan 20c is provided with fin protector 20d and fan protector 20e respectively.Fin protector 20d is used to prevent that the accidental shock from the outside from making above-mentioned plate-shaped fins breakage.Fan protector 20e also similarly is used to prevent that propeller type fan 20c is subjected to the influence of external impact therewith.

Compressor 20f is used for behind the gas refrigerant that gas refrigerant with low-temp low-pressure is transformed into HTHP it being discharged, and is bearing of paramount importance effect in the parts that constitute refrigerant loop.Refrigerant loop substantially by this compressor 20f, above-mentioned indoor heat converter 13, outdoor heat converter 20b, refrigerant piping 21, expansion valve, and the cross valve formations such as (expansion valve and cross valve are not shown) of the flow direction of regulation cold-producing medium, is the loop that cold-producing medium is circulated between indoor set 10 and off-premises station 20.

Off-premises station control part 20g is used to carry out relevant propeller type fan 20c, compressor 20f, reaches the action control of other various device of being located at off-premises station 20 etc., is made of various components.

In addition, also be provided with base 20h, be used for supporting box 20a and avoid the influence of external vibration etc. at off-premises station 20.In addition, for maintenance of implementing above-mentioned compressor 20f etc., has dismountable plate 20i near the wall of the casing 20a of above-mentioned compressor 20f.

Below, the air-conditioner that each occasion explanation during the meteyage cold operation and during heating operation constitutes like this.

At first, when carrying out heating operation, the cold-producing medium that is formed high temperature and high pressure gas by compressor 20f is delivered to the indoor heat converter 13 of indoor set 10 by refrigerant piping 21.In indoor set 10, to by fan 14 from sucking the room air that grid 12b is taken into, supply with heat from the gas refrigerant of the HTHP of the indoor heat converter 13 of flowing through.Like this, blow out hot blast by blow-off outlet 12c from front panel 12 belows.In addition, at the same time, the gas refrigerant of HTHP is condensation liquefaction in above-mentioned indoor heat converter 13, becomes the liquid refrigerant of HTHP.

The liquid refrigerant of this HTHP is delivered to the outdoor heat converter 20b of off-premises station 20 once more by refrigerant piping 21.In off-premises station 20, after not shown expansion valve decompression, become the liquid refrigerant of low-temp low-pressure.From being taken into the fresh keeping chamber outer air in the casing 20a by propeller type fan 20c, siphon away heat by the liquid refrigerant of the low-temp low-pressure of the outdoor heat converter 20b that flows through.The liquid refrigerant of low-temp low-pressure evaporates gasification thus, becomes the gas refrigerant of low-temp low-pressure.Once more it is passed out to compressor 20f, carry out said process repeatedly.

When refrigerating operaton, cold-producing medium is towards flowing in refrigerant loop with above-mentioned opposite direction.That is, the cold-producing medium that is formed the gas of HTHP by compressor 20f is delivered to outdoor heat converter 20b by refrigerant piping 21, transfers heat to outdoor air, and condensation liquefaction becomes the liquid refrigerant of HTHP.The liquid refrigerant of this HTHP becomes the liquid refrigerant of low-temp low-pressure by not shown expansion valve, delivers to indoor heat converter 13 by refrigerant piping 21 once more.The liquid refrigerant of low-temp low-pressure siphons away heat from room air here this room air is cooled off, and simultaneously, cold-producing medium self evaporation is gasified, and becomes the gas refrigerant of low-temp low-pressure.Once more it is passed out to compressor 20f, and carry out said process repeatedly.

These operations are by coordinating to be contained in the indoor set control part 15 in the indoor set 10 and be contained in off-premises station control part 20g in the off-premises station 20, thereby control.

Below, with reference to Fig. 2 characteristic part of the present invention is described.Here, Fig. 2 of use illustrates fan 14 and its air-supply system in the section of the A-A line of Fig. 1.

Fan air-supply system is set in above-mentioned indoor set 10, and this fan air-supply system is used for attracting room air by operation fan 14 from sucking grid 12b, will be blown out to indoor by the Air Conditioning that indoor heat converter 13 has carried out heat exchange from blow-off outlet 12c.In this fan air-supply system the air channel 40 that Air Conditioning is directed into blow-off outlet 12c is set.

Air channel 40 is for being formed on the outer peripheral face 14a of fan 14 cylindraceous and being located at as the space between the air channel wall 41 of the support 11 of shell component parts.

The inlet 42 in air channel 40 is on the line of the C of fan center at the axle center when being connected to become fan 14 revolution and the some K on the air channel wall 41, and its throat width is Wi.Point K is the starting point of shell coiling (concave curved surface of the flow direction of air channel wall 41), when front panel 12 sides of indoor set 10 are watched, is positioned at the top rear face side (wall side) of fan 14 substantially.

To be starting point be formed into outlet 43 towards the gyratory directions (being clockwise direction) of fan 14 in illustrated example to enter the mouth 42 in air channel 40.To be the air channel width W expand to the exit width Wo of outlet 43 from 42 the throat width Wi of entering the mouth to the width in air channel 40 gradually.Exit width Wo is and the line of the air channel center line 44 orthogonals distance from the terminal point M of the shell coiling of air channel wall 41 to outlet upper side 45.

At flow direction the place ahead (front face side of indoor set 10) of outlet 43 configuration front panel 12, the blow-off outlet 12c of this front panel 12 is towards indoor opening.In addition, in general formation, the orienting vertical wind-guiding vanes (omitting diagram) in that nearby disposing of outlet 43 is used to adjust left and right sides blow-off direction in addition, is used to adjust the horizontal wind blade of blow-off direction (omission diagram) up and down in blow-off outlet 12c configuration.

As shown in Figure 2, at fan 14 stabilising arrangement 70 is set and flows into rear wall parts 50 with the air that is positioned at 40 tops, air channel.

Air flows into the part that rear wall parts 50 conjointly is provided with for inlet 42 tops that are positioned at air channel 40, with air channel wall 41, in front end (upper end) portion of suction inducer 51 counter-rotating portion 52 is set.Suck inducer 51 and be from the starting point K of air channel wall 41 and form the continuous wall in recess ground to wall initial point N, the concave depth degree of depth of deep (from the line of connection source K and wall initial point N to recess) that below will become suction inducer 51 is called suction throttle orifice width f.

On the other hand, counter-rotating portion 52 is disposed at Air Conditioning that air channel wall 41 and air flow into rear wall parts 50 indoor heat converter 13 behind and is directed into 40 ground, air channel and makes the flow part of counter-rotating of Air Conditioning for flowing through, its front end shape have from wall initial point N to the limit P form the 1st planar portions 53 of the vertical face of the cardinal principle of extending and form the 2nd planar portions 54 of the face of the cardinal principle level that (rear side) towards the rear extend from summit P to the initial point Q of counter-rotating portion towards the top.The back side portion 55 that forms the inclined plane from the initial point Q of counter-rotating portion below tiltedly is set at the back side that sucks inducer 51.

Below the width of above-mentioned counter-rotating portion 52 promptly is called counter-rotating portion width (counter-rotating thickness) g from wall initial point N to the initial point Q of counter-rotating portion apart from NQ, will be from starting point K to wall initial point N being called apart from KN sucks entrance length e, will be from the line that connects the C of fan center and starting point K to the angle that sucks the line segment KN that entrance length e stipulates is called suction throttling angle of spot hole γ.

For said fans air-supply system, in the 1st form of implementation, stipulate that as described below air flows into the suction throttle orifice width f in the shape of rear wall parts 50.

Suck throttle orifice width f and be the value that the recess wall that is provided with continuously towards the top from the inlet 42 (starting point K) of the air channel wall 41 that forms air channel 40 promptly sucks the recess depths of inducer 51 is shown, the vertical range from line segment KN to the degree of depth is shown.Here, be made as D as fan diameter, the ratio (f/D) of the relative fan diameter D of suction throttle orifice width f of the air channel inlet upstream side of being located in the shell be in 0.02～0.03 the scope it set (0.02≤f/D≤0.03) fan 14.

Fig. 3 illustrates by suitably changing above-mentioned f/D and measuring the result that the noise on the same air quantity basis obtains respectively.

By this measurement result as can be known, it is minimum that f/D is roughly 0.025 o'clock noise, and, when making, the value corresponding with this lowest noise value relatively suck throttle orifice width f when increasing and decreasing, and noise all increases on all occasions.Therefore, the scope of the value of will be from the noise on the identical air quantity basis minimum f/D during to rising Δ dB=1dB (A) is judged as the suitable scope of design that sucks throttle orifice width f, from result shown in Figure 3, the scope of f/D is defined as 0.02≤f/D≤0.03.

Make Δ dB=1dB (A), be because 1dB (A) but this numerical value is the big or small degree of clear understanding to noise reduction effect when considering evaluated error and deviation etc.

For said fans air-supply system, in the 2nd form of implementation, stipulate that as described below air flows into the width g of counter-rotating portion in the shape of rear wall parts 50.

Counter-rotating portion width (counter-rotating thickness) g be illustrate counter-rotating portion 52 width from wall initial point N to the initial point Q of counter-rotating portion apart from NQ.Here, as the fan diameter of establishing fan 14 is D, then makes the ratio (g/D) of the relative fan diameter D of the width g of counter-rotating portion of the inflow air stream of the air channel inlet upstream side of being located in the shell become 0.06≤g/D ground it is set.

Fig. 4 illustrates by suitably changing above-mentioned g/D and measuring the result that the noise on the same air quantity basis obtains respectively.

By this measurement result as can be known, it is minimum that g/D is roughly 0.06 o'clock noise, and when g/D was lower than 0.06, noise figure increased, and when g/D than 0.06 greatly the time, noise figure does not change substantially, promptly is roughly necessarily.Therefore, judge the critical value that the nondecreasing basically g/D=0.06 of noise on the same air quantity basis is the width g of counter-rotating portion, determine that according to result shown in Figure 4 suitable scope of design is 0.06≤g/D.

, for the width g of counter-rotating portion, though make as described above that preferably the ratio of relative fan diameter D is the bigger value more than 0.06, g/D increases and means the width g of counter-rotating portion thickening.Yet when becoming big with the integrally formed wall thickness as the counter-rotating portion 52 of resin-molded component of support 11, the influence of the thermal contraction when being subjected to being shaped is bigger, is easy to produce the strain that is brought by thermal deformation.For this reason, for the higher limit of the width g of counter-rotating portion, owing to the problem that does not produce on the such production technology of thermal deformation is restricted.

Therefore, be preferably the shape that to guarantee to realize the width g of counter-rotating portion of low noiseization and be difficult for producing the counter-rotating portion 52 of the thermal deformation when being shaped.

Fig. 7 is the figure that the modified example of counter-rotating portion 52 is shown, and the recess 56 of rectangular cross section is set in the 1st planar portions 53.Like this, can when guaranteeing the width g of counter-rotating portion, prevent to produce heavy section in counter-rotating portion 52.Therefore, can prevent to produce the strain that thermal deformation caused that brings by ester moulding, so, by reducing the restriction on the production technology, can increase the design freedom of the width g of counter-rotating portion.In illustrated example, make recess 56 be the rectangular cross section shape, but be not limited thereto, for example making concave surface 56a is that other modified example such as concave curved surface is also effective.

For said fans air-supply system, in the 3rd form of implementation, stipulate that as described below air flows into the suction entrance length e in the rear wall parts 50 and sucks throttling angle of spot hole γ.

Suck entrance length e and be from starting point K to wall initial point N apart from KN, in addition, suck throttling angle of spot hole γ and be angle from the line CK that connects C of fan center and starting point K to the line segment KN that is used for suction entrance length e is stipulated.Fan diameter as fan 14 is D, and the scope ground that then makes the ratio (e/D) of the relative fan diameter D of suction entrance length e of the air channel inlet upstream side of being located in the shell be in 0.25≤e/D≤0.3 is set it.In addition, the scope ground that makes suction throttling angle of spot hole γ be in 80 degree≤γ≤90 degree is set.

Fig. 5 illustrates by suitably changing above-mentioned e/D and measuring the result that the noise on the same air quantity basis obtains respectively.

By this measurement result as can be known, it is minimum that e/D is roughly 0.275 o'clock noise, and, when making, the value corresponding with this lowest noise value relatively suck entrance length e when increasing and decreasing, and noise all increases on all occasions.Therefore, same with above-mentioned suction throttle orifice width f, the scope of the value of will be from the noise on the identical air quantity basis minimum e/D during to rising Δ dB=1dB (A) is judged as the suitable scope of design that sucks throttle orifice width f, according to result shown in Figure 5, the scope of e/D is defined as 0.25≤e/D≤0.3.

Fig. 6 illustrates by suitably changing above-mentioned suction throttling angle of spot hole γ and measuring the result that the noise on the same air quantity basis obtains respectively.

By this measurement result as can be known, sucking throttling angle of spot hole γ, to be roughly 85 noises when spending minimum, and, even also have the tendency that increases noise in the occasion that makes equal angular γ increase and decrease.Therefore, same with above-mentioned suction throttle orifice width f, the scope of the value of will be from the noise on the identical air quantity basis minimum suction throttling angle of spot hole γ during to rising Δ dB=1dB (A) is judged as the suitable scope of design that sucks throttling angle of spot hole γ, according to result shown in Figure 6, the scope that sucks throttling angle of spot hole γ is defined as 80 degree≤γ≤90 degree.

Like this, when the regulation that will from above-mentioned the 1st form of implementation to the 3 forms of implementation, illustrate during, can easily improve air quantity and the such aerodynamic quality of noise as the shape of the air stream rear wall parts 50 of index Design fan air-supply system.In addition, because making the value of stipulating in each form of implementation be in the minimum noise figure of noise on the same air quantity basis is determined in the scope of the value that exceeds 1dB (A), so,, can easily form low noise air channel shape by forming the air channel shape in the afore mentioned rules value.

In addition, even the independent respectively employing of above-mentioned each form of implementation also can obtain to improve the action effect of aerodynamic characteristics, but as suitably each form of implementation is adopted in combination, promptly suitably combination is adopted more than 2 at least, can further be promoted the air under the same air output to flow into the low noiseization of rear wall parts 50 and fan air-supply system by mutual effect stack.

That is, the indoor set 10 with air inflow rear wall parts 50 of the shape that designs by afore mentioned rules becomes the good structure of aerodynamic characteristicses such as low noiseization of fan air-supply system, also can improve commodity with its air-conditioner as inscape.

For the fan air channel system with above-mentioned air channel 40, such exit width Wo that stipulates air channel 40 of following explanation in the 4th form of implementation.Exit width Wo is relevant with the discharge form of the Air Conditioning that flows out from fan air-supply system.

Here, fan diameter as fan 14 is D, the outlet 43 that forms air channel 40 in the enclosure is that the extended line of outlet upper side 45 on flow direction of outlet is a, and then the ratio (Wo/D) of the relative fan diameter D of exit width Wo is being set below 0.55 (Wo/D≤0.55).

Fig. 9 illustrates by suitably changing above-mentioned Wo/D and measuring the result that the noise on the same air quantity basis obtains respectively.

By this measurement result as can be known, less than 0.55 zone, noise is certain at Wo/D, but greater than 0.55 o'clock, noise increases.Therefore, judge that there is the boundary line in the Wo/D=0.55 that the noise on same air quantity basis begins to add, the suitable scope of Wo is decided to be Wo/D≤0.55.Supply air duct system for having above-mentioned air channel 40 stipulates upstream open angle θ 2 as described below in the 5th form of implementation.Upstream open angle θ 2 flows into relevant with the air that is directed into the Air Conditioning of fan 14 in fan air-supply system.

Here, upstream open angle θ 2 is defined.This upstream open angle θ 2 is for becoming the angle of negative pressure region in the air inflow side of fan 14, this upstream open angle θ 2 sets θ 2 〉=180 degree for.

Further specify upstream open angle θ 2 below.Upstream open angle θ 2 is the angle from the line of the top of the effective front end face height h that connects stabilising arrangement 70 and the C of fan center to the line that is connected starting point K that shell winds the line and the C of fan center.

For stabilising arrangement 70, have shown in Figure 11 A like that there is the mountain valley shape of height in leading section at stabilising arrangement 70 and shown in Figure 11 B like that leading section become certain or the rectilinear form of certain height substantially.Effective front end face height h of stabilising arrangement 70 is used for the effective depth of stabilising arrangement apart from extended line a, therefore, it is the height of a to the 70a of paddy portion that the occasion of mountain valley shape becomes from extended line, and being a in the occasion of rectilinear form from extended line becomes actual height h to the height of leading section 70c.Symbol 70b among Figure 11 A illustrates the mountain portion of mountain valley shape.

Figure 10 illustrates by the above-mentioned upstream open of appropriate change angle θ 2 and measures the result that the noise on the same air quantity basis obtains respectively.

By this measurement result as can be known, along with upstream open angle θ 2 increases, noise reduces in higher ratio (big gradient) before becoming 180 degree, but when further becoming big above 180 degree, becomes certain substantially noise.Therefore, can judge that according to result shown in Figure 10 being set in 180 degree upstream open angle θ 2 above is suitable scope of design, be defined as θ 2 〉=180 degree.

In addition, though the independent respectively employing of the above-mentioned the 4th and the 5th form of implementation also can obtain to improve the action effect of aerodynamic characteristics, but adopt 2 forms of implementation as appropriate combination, then can further promote the low noiseization of the fan air-supply system under the same air output by mutual Overlay.

That is, having the exit width Wo of the shape that designs by afore mentioned rules and the indoor set 10 of upstream open angle θ 2 becomes the good structure of aerodynamic characteristicses such as low noiseization of fan air-supply system, and its air-conditioner as inscape also can be improved commodity.

For fan air channel system, in the 6th form of implementation, stipulate the shape, particularly stabilising arrangement tongue end angle [alpha] of stabilising arrangement 70 as described below with above-mentioned air channel 40.

Here, if the fan diameter of fan 14 is D, the outlet 43 that forms air channel 40 in the enclosure is that the extended line of outlet upper side 45 on flow direction of outlet is a, then will be called stabilising arrangement tongue end angle with extended line a angulation α, and this stabilising arrangement tongue end angle [alpha] will be in the scopes of 50 degree～60 degree set (50 degree≤α≤60 are spent) with the face 71 of fan 14 stabilising arrangement in opposite directions.

Figure 13 illustrates by appropriate change aforementioned stable device tongue end angle [alpha] and measures the result that the noise on the same air quantity basis obtains respectively.

By this measurement result as can be known, noise is minimum when being set in stabilising arrangement tongue end angle [alpha] near 57 degree, is the end with it, towards the direction that reduces angle or when the direction that increases angle changes noise all increase.Therefore, the stabilising arrangement tongue end angle [alpha] pairing noise figure minimum with the noise on same air quantity basis is benchmark, to be judged as the suitable scope of design of stabilising arrangement tongue end angle [alpha] from the angle of the scope of this a reference value rising Δ dB=1dB (A), according to result shown in Figure 13, the scope of stabilising arrangement tongue end angle [alpha] is decided to be 50≤α≤60 degree.

For fan air channel system, in the 7th form of implementation, stipulate the shape, particularly the actual height h of stabilising arrangement 70 of stabilising arrangement 70 as described below with above-mentioned air channel 40.

Here, the actual height h to stabilising arrangement 70 describes.At stabilising arrangement 70, shown in Figure 15 A like that, have that there is the mountain valley shape of height in leading section at stabilising arrangement 70 and shown in Figure 15 B like that leading section become certain or the rectilinear form of certain height substantially.The actual height h of stabilising arrangement 70 is used for the effective depth of regulation stabilising arrangement apart from extended line a, therefore, it is the height of a to the 71a of paddy portion that the occasion of mountain valley shape becomes from extended line, and being a in the occasion of rectilinear form from extended line becomes actual height h to the height of leading section 71c.

The actual height h of aforementioned stable device 70 is setting h/D in the occasion of the ratio (h/D) of the fan diameter D that relative fan 14 is shown with percentage (h/D≤25%) below 25%.

Figure 14 illustrates by the above-mentioned actual height h of appropriate change and measures the result that the noise on the same air quantity basis obtains respectively.

By this measurement result as can be known, the value when making noise minimum is roughly the occasion of setting h than 15% lowland, from the h increase and decrease corresponding with this minimum noise is increased.Therefore, be benchmark with this minimum, the region decision that will increase in the scope of Δ dB=1dB (A) is suitable scope of design, according to result shown in Figure 14, the scope of h/D is decided to be h/D≤25%.On the other hand, for the lower limit of the actual height h of stabilising arrangement 70, according to the big water desired height H decision of the h of h/D  15% correspondence minimum than noise.Water desired height H is the required value of outflow that is used to prevent the condensed water that takes place at fan 14.

Below, for the fan air channel system with above-mentioned air channel 40, explanation is arranged at ways 60 structure of stabilising arrangement 70 in form of implementation 8.

Ways 60 flows into part with the cardinal principle center position guiding ground setting of indoor air stream towards fan 14 at the room air of the stabilising arrangement of the upstream side of being located at fan 14.This ways 60 is positioned at the upstream side of stabilising arrangement 70, promptly is positioned at front panel 12 sides of stabilising arrangement 70 fronts, forms the length direction setting of wind-guiding face 61 ground relevant with the actual height h of aforementioned stable device 70 along the axial and stabilising arrangement 70 of fan 14.

By such ways 60 is set, the room air that is imported by the operation of fan 14 is owing to successfully flow to the center position of fan 14 along wind-guiding face 61, so, noise testing result's as shown in figure 16 is such, compare with the noise on the same air quantity basis, a side the noise that ways 60 is set is lower.

Like this, by will be in the regulation of above-mentioned the 6th form of implementation and the 7th form of implementation explanation shape as index Design stabilising arrangement 70, or the ways 60 that illustrates in the 8th form of implementation is set, can in the fan air-supply system of indoor set 10, easily improve air quantity and the such aerodynamic quality of noise.In addition, make noise on the same air quantity basis be in minimum noise figure determine value interiorly by each form of implementation regulation to the scope of the value of high 1dB (A), so,, can easily set the stabilising arrangement shape favourable to low noise by forming the stabilising arrangement shape in the afore mentioned rules value.

In addition, even the independent respectively employing of above-mentioned each form of implementation also can obtain to improve the action effect of aerodynamic characteristics, but as suitably each form of implementation is adopted in combination, promptly suitably combination is adopted more than 2 at least, can be by the further low noiseization that promotes stabilising arrangement 70 under the same air output and fan air-supply system of mutual effect stack.

That is, the indoor set 10 with stabilising arrangement 70 of the shape that designs by afore mentioned rules becomes the good structure of aerodynamic characteristicses such as low noiseization of fan air-supply system, also can improve commodity with its air-conditioner as inscape.

For the shape in above-mentioned air channel 40, the such fan 14 and position of outlet 43 of stipulating of following explanation concerns in the 9th form of implementation.

Here, if the fan diameter of fan 14 is D, the outlet 43 that is located at formation air channel 40 in the shell is that the extended line of outlet upper side 45 on flow direction of outlet is a, being parallel to the tangent line b of fan diameter D of extended line a and the distance that extended line is a is d, then makes apart from the ratio (d/D) of the relative fan diameter D of d and sets in-0.2～0.2 scope (0.2≤d/D≤0.2).

In illustrated example, because the tangent line b of fan 14 is consistent with extended line a, so, b=0, therefore, b/D also becomes 0.In addition, by the fan 14 shown in the chain-dotted line among the figure ', 14 " occasion, tangent line b ', b " and extended line be that the distance of a is respectively-d and d.That is, here be that a is benchmark (d=0) with the extended line apart from d, from the direction of air channel wall 41 sides that the center C of fan 14 is left for negative, near the direction of the center C of fan 14 for just.

Figure 18 illustrates by the above-mentioned d/D of appropriate change and measures the result that the noise on the same air quantity basis obtains respectively.

By this measurement result as can be known, be 0 occasion at d/D, promptly tangent line b is the consistent occasion of a with extended line, noise is minimum, the either direction skew in minus side and the positive side, noise all increases.Therefore, will be from the noise on the same air quantity basis scope of the occasion rising Δ dB=1dB (A) of minimum d/D=0 be judged as suitable scope of design apart from d, from result shown in Figure 180, the scope of d/D is defined as-0.2≤d/D≤0.2.

For the shape in above-mentioned air channel 40, such downstream of stipulating of following explanation is to lower angle θ 1 in the 10th form of implementation.

Here, the definition downstream is to lower angle θ 1.If the fan diameter of fan 14 is D, the outlet 43 that is located at formation air channel 40 in the shell is that the extended line of outlet upper side 45 on flow direction of outlet is a, with the tangent line of the parallel or consistent fan diameter D of this extended line a is b, then the angle of air channel wall 41 sides that constitute with the line 82 of the starting point K of this tangent line b orthogonal and the line by the C of fan center 81 and shell coiling by forming air channel wall 41 and the C of fan center becomes the downstream to lower angle θ 1, and this downstream is set in lower angle θ 1 is in the scopes of 115 degree～125 degree (115 degree≤θ 1≤125 spend).

Figure 19 illustrates by the above-mentioned angle θ 1 of appropriate change and measures the result that the noise on the same air quantity basis obtains respectively.

By this measurement result as can be known, be that the 120 occasion noises of spending are minimum at downstream opening angle θ 1, noise all increases when making this angle θ 1 from 120 increases or minimizing.Therefore, with above-mentioned same apart from d, will be from the noise on same air quantity basis the scope of the occasion rising Δ dB=1dB (A) of minimum θ 1=120 degree be the suitable scope of design of downstream opening angle θ 1, according to result shown in Figure 19, the scope of downstream opening angle θ 1 is defined as 115 degree≤θ, 1≤125 degree.

For the shape in above-mentioned air channel 40, following explanation such stipulates to be formed at the outer peripheral face of fan 14 and the air channel width W between the air channel wall 41 in the 11st form of implementation.

The air channel width W 42 enlarges width to the outlet 43 length of run L corresponding to shell air channel center line 44 towards flow direction gradually from entering the mouth, and the optimum shape that this width enlarges is discussed below.

Consider the variation of air channel width W, be divided into 3 kinds as shown in Figure 20.That is,, have the 1. big convex of variation of entrance side, 2. export the straight line that increases with certain proportion, reach the 3. big spill of variation of outlet side from entering the mouth to from the variation of the 42 air channel width W that increase to outlet 43 that enter the mouth.For such 3 kinds of air channel shapes each, measure the noise on the same air quantity basis, obtain result shown in Figure 21.By this result as can be known, it is the shape that starting point (W=0) straight line increases that the variation of air channel width W is preferably to export 43, in other words, exports 43 shape for the length of run L with air channel center line 44 is increased to from starting point 0 pro rata.

Yet, for inlet 42, owing to need throat width Wi (Wi ≠ 0), so, as shown in figure 22, slowly and smoothly increase from the throat width Wi of starting point, preferably with Figure 20 3. shown in the concave shape increase the curved portion that need link to each other with above-mentioned line part (ratio increase part).Promptly, the optimum shape of air channel width W can have the expansion line part 61 of outlet 43 sides and the curve part 62 ground distortion of inlet 42 sides, this expansion line part 61 is increased to exit width Wo pro rata from the length of run L of the inlet 42 relative air channel center lines 44 that become starting point, this curve part 62 from the throat width Wi that becomes starting point increase lentamente and with enlarge line part 61 and link to each other.

At last, for the shape in above-mentioned air channel 40, in the 12nd form of implementation, stipulate the optimum value of throat width Wi as described below.

As the diameter of establishing fan 14 is D, the ratio (Wi/D) of the relative fan diameter D of throat width Wi is in when representing with percentage in 0.7%～0.8% the scope sets (0.7%≤Wi/D≤0.8%).

Figure 23 illustrates by suitably changing above-mentioned Wi/D and measuring the result that the noise on the same air quantity basis obtains respectively.

By this measurement result as can be known, it is minimum that Wi/D is roughly 0.75 o'clock noise, increases or reduce this ratio and all have the tendency that noise increases.Therefore, with above-mentioned same apart from d, to be judged as the suitable scope of design of throat width Wi from scope,, the scope of Wi/D will be defined as 0.7≤Wi/D≤0.8 from result shown in Figure 23 in the value of the minimum throat width Wi of the noise on the identical air quantity basis during to rising Δ dB=1dB (A).

Like this, when the regulation that will from above-mentioned the 9th form of implementation to the 12 forms of implementation, illustrate during, can easily improve air quantity and the such aerodynamic quality of noise as the shape in index Design air channel 40.In addition, because being in the scope of the value of minimum noise figure when exceeding 1dB (A), the noise of value on making same air quantity basis of stipulating in each form of implementation determined, so,, can easily form low noise air channel shape by forming the air channel shape in the afore mentioned rules value.

In addition, though the independent respectively employing of above-mentioned each form of implementation also can obtain to improve the action effect of aerodynamic characteristics, but as suitably each form of implementation is adopted in combination, promptly suitably combination is adopted more than 2 at least, can be by the further low noiseization that promotes air channel 40 under the same air output and fan air-supply system of mutual effect stack.

That is, the indoor set 10 with air channel 40 of the shape that designs by afore mentioned rules becomes the good structure of aerodynamic characteristicses such as low noiseization of fan air-supply system, also can improve commodity with its air-conditioner as inscape.

Formation of the present invention is not limited to above-mentioned form of implementation, can suitably change in the scope that does not break away from main idea of the present invention.

Claims

1. indoor set, comprise be used for from suction inlet suck room air and the tangential fan that blows out from blow-off outlet, at above-mentioned room air and indoor set control part that constitutes from the indoor heat converter that carries out heat exchange between the cold-producing medium of off-premises station supply, by various components and the shell of accommodating these each equipment;

It is characterized in that: be made as D as the fan diameter with above-mentioned tangential fan, the suction throttle orifice width of being located at the air channel inlet upstream side in the above-mentioned shell is made as f, then f/D is in 0.02～0.03 scope interior (0.02≤f/D≤0.03).

2. indoor set according to claim 1 is characterized in that: the fan diameter as above-mentioned tangential fan is D, and the counter-rotating portion width of being located at the inflow air stream of the air channel inlet upstream side in the above-mentioned shell is g, and then g/D is more than 0.06 (0.06≤g/D).

3. indoor set according to claim 1, it is characterized in that: the fan diameter as above-mentioned tangential fan is D, the suction entrance length of being located at the air channel inlet upstream side in the above-mentioned shell is e, sucking the throttling angle of spot hole is γ, then e/D is in 0.25～0.3 scope interior (0.25≤e/D≤0.3), and γ is in the scopes interior (80 degree≤γ≤90 degree) of 80 degree～90 degree.

4. indoor set according to claim 2, it is characterized in that: the fan diameter as above-mentioned tangential fan is D, the suction entrance length of being located at the air channel inlet upstream side in the above-mentioned shell is e, sucking the throttling angle of spot hole is γ, then e/D is in 0.25～0.3 scope interior (0.25≤e/D≤0.3), and γ is in the scopes interior (80 degree≤γ≤90 degree) of 80 degree～90 degree.

5. according to claim 2 or 4 described indoor sets, it is characterized in that: form recess at the face that forms the above-mentioned counter-rotating width g of portion.

6. air-conditioner, it is characterized in that: have any one described indoor set among off-premises station and the claim 1-3, this off-premises station comprises outdoor heat converter, the gas refrigerant of HTHP is passed out to compressor, and the off-premises station control part that is made of various components of heat exchanger.