JP2006038443A - Blast duct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a noise in an operation sound in a diffusing side of a blast duct. <P>SOLUTION: In this blast duct constituted to diffuse an air flow W from a diffusing port 3 via a blast flow passage 2 widened width-directionally from a cylindrical duct part 1 in an upstream, a passage depth in the blast flow passage 2 is made gradually shallow from the upstream toward a downstream side to get shallowest in a throat part 2c, and to made gradually deep from throat part 2c toward the diffusing port 3, and the air flow W flowing in the blast flow passage 2 with the passage depth getting gradually shallow from the upstream toward the downstream side to get shallowest in the throat part 2c is straightened and made to flow contactingly closely with an inner circumferential face. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air duct used for connecting an outdoor unit and an indoor unit.

  For example, there is an outdoor unit equipped with a humidifying unit with a built-in air blowing means, and humidified air is supplied to the indoor space from a blowout port installed in the indoor unit via a blower duct.

  In the case of the air duct as described above, since the air outlet portion is arranged to be opposed to the suction side of the heat exchanger of the indoor unit, it is necessary to increase the opening area of the air outlet portion from the upstream side. It is comprised so that an airflow may be blown out from a blower outlet part through the ventilation flow-path part which spreads in the width direction from the cylindrical duct part of the side (refer patent document 1, 2, 3).

JP 2002-98360 A.

JP 2002-98361 A.

JP 2002-98363 A.

  As a thing of the structure similar to the ventilation duct currently disclosed by the said patent documents 1-3, there exists what is shown in FIG.15 and FIG.16.

  In this case, the air duct A is configured to blow an air flow W from a rectangular-shaped large-diameter air outlet 3 through an air flow passage 2 that extends in the width direction from the cylindrical duct 1 on the upstream side. However, the connection part of the exit part 1a of the cylindrical duct part 1 and the inlet part 2a of the ventilation flow path part 2 is made into the sudden expansion part 4 in which the connection part was bent. Then, the air flow W blown out from the cylindrical duct portion 1 is peeled off at the inlet portion 2a of the air flow passage portion 2 as indicated by a dotted arrow w in FIG. 15 and is jetted on the inner peripheral surface of the air flow passage portion 2. And a large aerodynamic noise is generated.

  Further, the connection portion between the outlet portion 1a of the cylindrical duct portion 1 and the inlet portion 2a of the air flow passage portion 2 is bent, and the passage depth H of the air flow passage portion 2 is more abrupt than the inner diameter D of the cylindrical duct portion 1. Since it becomes large, separation of the air flow is likely to occur, and the blowing flow becomes difficult to follow along the inner surface of the air flow passage section 2. As a result, as shown by an arrow w in FIG. 16, it peels off at the inner peripheral surface and collides with the inner peripheral surface of the air flow passage section 2 in the form of a jet, and there is a problem that large aerodynamic noise is generated.

  Furthermore, since the outlet part 2b of the air flow passage part 2 is connected to the outlet part 3 via the inclined part 5 inclined downward, the blown air flow W is peeled off at the inclined part 5 and is generated by the peeling. There is also a problem that the separation flow E interferes with the filter 6 installed on the downstream side of the outlet 3 to generate aerodynamic noise.

  By the way, in the present conditions where the air blowing means and the air conveyance flow path (that is, the air duct) in the outdoor unit have been improved and sufficiently silenced, the air duct is the main sound source of the indoor operation sound. The generated sound has become dominant, and its improvement has become important.

  This invention is made | formed in view of said point, and aims at reducing the noise of the driving | running | working sound in the blowing side in a ventilation duct.

  In the present invention, as a first means for solving the above-described problem, the air flow W is blown out from the outlet portion 3 through the air flow passage portion 2 extending in the width direction from the cylindrical duct portion 1 on the upstream side. In the air duct, the passage depth in the air flow passage portion 2 gradually becomes shallower from the upstream side to the downstream side, becomes the shallowest in the throat portion 2c, and becomes gradually deeper from the throat portion 2c to the air outlet portion 3. It is configured as follows.

  By configuring as described above, the air flow W flowing through the air flow passage section 2 where the passage depth becomes gradually shallower from the upstream side to the downstream side and becomes the shallowest in the throat portion 2c is rectified and is formed on the inner peripheral surface. It will flow closely. Therefore, the generated aerodynamic noise is greatly reduced. And since it is comprised so that it may become an expanded flow path from which the passage depth becomes deeper gradually from the throat part 2c to the blower outlet part 3, a diffuser effect can be anticipated, and the pressure loss by the blower outlet part 3 side is expected. It does not become excessive and greatly contributes to the reduction of aerodynamic noise.

  In the present invention, as a second means for solving the above problem, in the air duct provided with the first means, the passage depth in the throat portion 2c is H, and the inner diameter of the cylindrical duct portion is D. In such a case, it is possible to set so that H <D. In such a case, rectification of the air flow W flowing from the cylindrical duct portion 1 to the air flow passage portion 2 is further promoted. .

  In the present invention, as a third means for solving the above-mentioned problem, in the air duct provided with the second means, it may be set so that 0.35 ≦ H / D ≦ 0.9. In such a case, as shown in the characteristic diagram of FIG. 5, it is possible to secure the effect of reducing the indoor driving noise.

  In the present invention, as a fourth means for solving the above problems, in the air duct provided with the first, second or third means, the outlet portion 1a of the cylindrical duct portion 1 and the air flow It is also possible to smoothly connect the inlet portion 2a of the passage portion 2, and in such a case, the rectification of the air flow W flowing from the cylindrical duct portion 1 to the air flow passage portion 2 is further promoted. Become.

  In the present invention, as a fifth means for solving the above-described problem, in the air duct provided with the first, second, third or fourth means, the cylindrical duct portion 1 is placed on the outdoor unit 12 side. On the other hand, the air outlet 3 may be disposed opposite to the suction side of the heat exchanger 15 in the indoor unit 11 so as to be parallel to the heat radiating fins of the heat exchanger 15 via a predetermined gap S. In such a configuration, aerodynamic noise due to separation is not generated, and an increase in pressure loss with respect to the heat radiating fin is eliminated, which greatly contributes to a reduction in operating noise indoors.

  In the present invention, as a sixth means for solving the above-described problem, in the air duct provided with the first, second, third, fourth, or fifth means, The outlet portion 2b can also be configured to expand upward toward the blowout port portion 3, and in this case, the occurrence of separation at the blowout port portion 3 is further suppressed, and the indoor side It greatly contributes to driving noise reduction.

  In the present invention, as a seventh means for solving the above-mentioned problem, in the air duct provided with the first, second, third, fourth, fifth or sixth means, the outlet part 3 is provided with a filter 6 that removes dust and the like from the blown air flow W, and a pre-filter 6B made of a porous soft material can be provided at least on the upstream surface side of the filter 6, and thus configured. In this case, the interference between the blown air flow and the filter 6 is alleviated by the prefilter 6B made of a porous soft material, which further contributes to the reduction of the operation sound on the indoor side.

  In the present invention, as an eighth means for solving the above problems, in the air duct provided with the first, second, third, fourth, fifth, sixth or seventh means, An elbow 33 is interposed in a bent portion formed in a connection portion of the cylindrical duct portion 1 in the connecting hose 19 constituting a flow path located on the upstream side of the cylindrical duct portion 1, and the radius of curvature of the elbow 33 is determined. The sound absorbing material 34 can also be disposed on the large outer peripheral surface, and in such a configuration, the air flow from the upstream side occurs when the elbow 33 collides with the outer peripheral surface having a large curvature radius. The interference sound is absorbed by the sound absorbing material 34, which further contributes to the reduction of the driving sound indoors.

In the present invention, as a ninth means for solving the above problem, in the air duct provided with the eighth means, the inner diameter D ₀ of the cylindrical duct portion 1 is set to be larger than the inner diameter D of the elbow 33. The air flow which flows through the cylindrical duct part 1 will be rectified, and it can reduce a driving | running sound compared with the case where both internal diameters are made the same.

  In the present invention, as a tenth means for solving the above-described problem, a silencer 35 is interposed at a proper position of the communication hose 19 in the air duct provided with the eighth or ninth means. In such a configuration, the sound passing through the pipe of the air flow flowing through the communication hose 19 is reduced by the silencer 35, and the operation noise can be further reduced.

  According to the first means of the present invention, in the air duct configured to blow out the air flow W from the air outlet portion 3 via the air flow passage portion 2 extending in the width direction from the cylindrical duct portion 1 on the upstream side, The passage depth in the air flow passage section 2 is configured to gradually become shallower from the upstream side to the downstream side, to become the shallowest in the throat part 2c, and to gradually become deeper from the throat part 2c to the outlet part 3, Since the air flow W flowing through the air flow passage portion 2 where the passage depth becomes gradually shallower from the upstream side to the downstream side and becomes the shallowest in the throat portion 2c is rectified and flows in close contact with the inner peripheral surface. The aerodynamic noise generated is greatly reduced. And since it is comprised so that it may become an expanded flow path from which the passage depth becomes deeper gradually from the throat part 2c to the blower outlet part 3, a diffuser effect can be anticipated, and the pressure loss by the blower outlet part 3 side is expected. There is also an effect of greatly contributing to reduction of aerodynamic noise without becoming excessive.

  As in the second means of the present invention, in the air duct provided with the first means, when the passage depth in the throat portion 2c is H and the inner diameter of the cylindrical duct portion is D, H <D. In such a case, the rectification of the air flow W flowing from the cylindrical duct portion 1 to the air flow passage portion 2 is further promoted.

  As in the third means of the present invention, in the air duct provided with the second means, it can be set so that 0.35 ≦ H / D ≦ 0.9, and when configured as such As shown in the characteristic diagram of FIG. 5, the effect of reducing the indoor driving noise can be ensured.

  As in the fourth means of the present invention, in the air duct provided with the first, second or third means, the outlet portion 1a of the cylindrical duct portion 1 and the inlet portion 2a of the air flow passage portion 2 Can be connected smoothly. In such a case, the rectification of the air flow W flowing from the cylindrical duct portion 1 to the air flow passage portion 2 is further promoted.

  As in the fifth means of the present invention, in the air duct provided with the first, second, third or fourth means, the cylindrical duct portion 1 is connected to the outdoor unit 12 side, while the outlet When the unit 3 is arranged so as to be parallel to the heat radiating fins of the heat exchanger 15 via the predetermined gap S on the suction side of the heat exchanger 15 in the indoor unit 11, Also, aerodynamic noise due to separation does not occur, and there is no increase in pressure loss with respect to the heat radiating fins, which greatly contributes to the reduction of operating noise indoors.

  As in the sixth means of the present invention, in the air duct provided with the first, second, third, fourth or fifth means, the outlet portion 2b of the air flow passage portion 2 is connected to the air outlet. It can also be configured to expand upward toward the part 3, and in such a case, the occurrence of separation at the air outlet part 3 will be further suppressed, greatly contributing to the reduction of the operating noise indoors. To do.

  As in the seventh means of the present invention, in the air duct provided with the first, second, third, fourth, fifth or sixth means, the air outlet W 3 is supplied with the blowout air flow W. A filter 6 for removing dust and the like can be provided, and a pre-filter 6B made of a porous soft material can be provided at least on the upstream surface side of the filter 6. Is mitigated by the pre-filter 6B made of a porous soft material, which further contributes to the reduction of the operating sound indoors.

  As in the eighth means of the present invention, in the air duct provided with the first, second, third, fourth, fifth, sixth or seventh means, on the upstream side of the cylindrical duct portion 1. An elbow 33 is interposed in a bent portion formed in a connecting portion of the cylindrical duct portion 1 in the communication hose 19 constituting the positioned flow path, and sound absorption is performed on the outer peripheral surface of the elbow 33 having a large curvature radius. The material 34 can also be provided. In such a configuration, the sound absorbing material 34 absorbs the interference sound generated when the air flow from the upstream side collides with the outer peripheral surface of the elbow 33 having a large curvature radius. As a result, the driving noise is reduced more indoors.

As in the ninth means of the present invention, in the air duct provided with the eighth means, the inner diameter D ₀ of the cylindrical duct portion 1 can be set smaller than the inner diameter D of the elbow 33, When comprised in this way, the airflow which flows through the cylindrical duct part 1 will be rectified, and a driving | running sound can be reduced compared with the case where both internal diameters are made the same.

  As in the tenth means of the present invention, in the air duct provided with the eighth or ninth means, a silencer 35 can be interposed at an appropriate position of the communication hose 19, and it is configured as such. In this case, the in-pipe passage sound of the airflow flowing through the communication hose 19 is reduced by the silencer 35, and the operation noise can be further reduced.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First Embodiment FIGS. 1 to 5 show an air duct according to a first embodiment of the present invention.

  First, a schematic configuration of an air conditioner provided with an air duct according to the best mode for carrying out the present invention will be described.

  As shown in FIG. 1, the air conditioner includes, for example, an indoor unit 11 attached to a wall surface 10a on the room R side of a building wall 10 and an outdoor unit 12 installed outside the building.

  The outdoor unit 12 includes an outdoor air conditioning unit 13 and a ventilation unit 14 that store an outdoor heat exchanger, an outdoor fan (not shown), and the like. An indoor heat exchanger 15 and an indoor fan 16 are accommodated in the indoor unit 11.

  The various heat exchangers and the heat exchangers are connected to each other through refrigerant pipes (not shown) via various refrigeration equipments to constitute an effective air conditioning refrigeration circuit. Further, between the ventilation unit 14 on the outdoor unit 12 side and the indoor unit 11, outside air from the ventilation unit 14 is supplied to the indoor unit 11 side, and indoor air is supplied to the ventilation unit as necessary. The ventilation duct A for discharging | emitting outside through 14 is provided.

  The indoor unit 11 is provided with a main body casing 11a having an indoor air suction grille 17 and an air outlet 18. Inside the main body casing 11a, the indoor heat exchanger 15, the indoor fan 16, and the tips of the blower duct A are provided. A blowing nozzle B for blowing outside air connected to the section is disposed.

  On the other hand, although not shown, the outdoor air conditioning unit 13 is provided with a compressor, a four-way switching valve, an accumulator, an outdoor heat exchanger, an electric expansion valve, an outdoor fan, etc., which are located in the main body casing 13a. It has been. Reference numeral 20 denotes an air outlet provided on the front surface of the main body casing 13 a of the outdoor air conditioning unit 13.

  Further, the ventilation unit 14 includes a flat box-shaped casing 14a having a predetermined height corresponding to the main body casing 13a of the outdoor air conditioning unit 13 and having a predetermined height, and the left side of the front side wall portion of the casing 14a. A space for installing the outside air suction port 21 on the side, an opening 23 penetrating in the vertical direction for inserting and connecting the air blowing flow passage member 22 for supplying outside air from below at the right end of the bottom wall, and a ventilation fan 25 on the inside. 24 are provided.

  The ventilation fan 25 is provided on a lower surface side of the fan motor 26, an impeller 27 that is rotationally driven by the fan motor 26, a fan housing 28 that rotatably stores the impeller 27, and the fan housing 28. The fan motor 26 and the fan housing 28 are, for example, a predetermined support member on the bottom wall portion of the casing 14a. The bell motor 30 and the like form an air suction port 29 to the central shaft portion of the impeller 27. It is supported and fixed through.

  The impeller 27 is formed of, for example, a flattened centrifugal impeller as much as possible, and a plurality of blades according to the rotation direction between the upper disk-shaped hub and the lower donut-plate-shaped shroud. They are arranged side by side in the circumferential direction with a predetermined blade angle and a predetermined blade interval.

  Also, the air inlet side opening edge on the shroud side is loosely fitted in the air inlet 29 side opening edge of the bell mouth 30 bent in a U-shaped cross section so as to be relatively rotatable with a predetermined gap. Yes. As a result, a sealing function of the air passage in the fan housing 28 is realized.

  Further, the fan housing 28 has, for example, a planar scroll shape, and is formed of a continuous surface of a plurality of arc portions each having a different radius, and the air outlet portion has a passage shape positioned on the most downstream side of the scroll portion. It is configured to have an equal diameter in which a tangent line extends from a circular arc surface of the circular arc portion to a predetermined air blowing direction (a right end direction on the front side of the casing 14a).

  And the opening part for connection with the flow member 22 for air blowing is provided in the bottom wall part (specifically right end part of the bellmouth 30) of the exit part of the air blowing outlet, On the other hand, the upper end side air inlet 31 of the air blowing channel member 22 extending downward from above is connected and communicated. The air blowing channel member 22 extends straight down through the opening 23 formed in the bottom plate portion of the casing 14a.

  In the above-described configuration, for example, when the fan motor 26 is driven, the impeller 27 rotates correspondingly, and the outside air sucked from the outside air suction port 29 is converted into the lower surface portion of the fan housing 28. The air is sucked into the impeller 27 from the air suction port 29 formed by the side bell mouth 30 and blown out in the centrifugal direction. Since the fan housing 28 has a scroll structure, the air blown in the centrifugal direction is collected at the air outlet portion located at the front end thereof and extending in the right tangential direction, and in the extending direction. Blown out.

  The air blowing flow path member 22 is connected to a blowing nozzle B disposed on the indoor unit 11 side through a blower duct A.

  As shown in FIGS. 2 to 4, the blowout nozzle B has an air flow W from a large-diameter blowout port 3 having a rectangular shape through an air flow passage 2 that extends in the width direction from the cylindrical duct 1 on the upstream side. It is configured to blow out.

  The passage depth in the air flow passage section 2 is configured to gradually become shallower from the upstream side to the downstream side, to become the shallowest in the throat part 2c, and to gradually become deeper from the throat part 2c to the outlet part 3. . It is desirable to set so that H <D, where H is the passage depth in the throat portion 2c and D is the inner diameter of the cylindrical duct portion.

  Further, the outlet portion 1 a of the cylindrical duct portion 1 and the inlet portion 2 a of the air flow passage portion 2 are smoothly connected via an arc portion 7.

  Further, the air outlet 3 of the air outlet nozzle B is disposed on the suction side of the heat exchanger 15 in the indoor unit 11 so as to be parallel to the radiating fins of the heat exchanger 15 via a predetermined gap S. . Reference numeral 6 denotes a filter.

  In the air duct configured as described above, the following operational effects are obtained.

  Due to the operation of the ventilation unit 14 in the outdoor unit 12, the air flow (that is, the outside air) W supplied through the air duct A gradually decreases in depth from the upstream side to the downstream side and becomes the shallowest in the throat portion 2c. When flowing through the air flow passage section 2, the flow is rectified and flows in close contact with the inner peripheral surface. As a result, the generated aerodynamic noise is greatly reduced.

  And since it is comprised so that it may become an expanded flow path from which the passage depth becomes deeper gradually from the throat part 2c to the blower outlet part 3, a diffuser effect can be anticipated, and the pressure loss by the blower outlet part 3 side is expected. There is also an effect of greatly contributing to reduction of aerodynamic noise without becoming excessive.

  As described above, when the passage depth in the throat portion 2c is H and the inner diameter of the cylindrical duct portion is D, it is desirable to set H <D. The rectification of the air flow W flowing through the path portion 2 is further promoted.

By the way, in FIG. 1, the sound collecting microphone 32 is installed at a position 0.8 m downward from the position 1 m ahead of the indoor unit 11 so that the inner diameter D of the cylindrical duct portion is 23 mm, and the passage in the throat portion 2 c. When the depth H was changed and the driving sound on the indoor unit 11 side was measured, the result of FIG. 5 was obtained. Here, the air volume was 0.39 m ³ / min.

  According to the measurement result, it can be seen that the driving sound is −1 dBA or less in the region of 0.35 ≦ H / D ≦ 0.9, and the effect of reducing the indoor driving sound can be ensured.

  Further, when the air outlet 3 in the air outlet nozzle B is arranged opposite to the suction side of the heat exchanger 15 in the indoor unit 11 so as to be parallel to the heat dissipating fins of the heat exchanger 15 via a predetermined gap S, peeling occurs. No aerodynamic noise is generated, and there is no increase in pressure loss with respect to the heat radiating fins, greatly contributing to the reduction of indoor operation noise.

  Furthermore, if the outlet part 2b of the air flow passage part 2 in the outlet nozzle B is configured to expand upward toward the outlet part 3, the occurrence of peeling at the outlet part 3 is further suppressed. This greatly contributes to the reduction of driving noise indoors.

  The embodiment described above (that is, the embodiment according to claims 1 to 6) is disclosed in the foregoing specification and drawings.

  Hereinafter, a newly added embodiment (that is, an embodiment according to claims 7 to 10) will be described.

Second Embodiment FIGS. 6 to 12 show an air duct according to a second embodiment of the present invention.

  The air conditioner in which the air duct according to the present embodiment is used is similar to the air conditioner in which the air duct according to the first embodiment is used, for example, on the room R side of the building wall 10. It is comprised by the indoor unit 11 attached to the wall surface 10a, and the outdoor unit 12 installed outside a building (refer FIG. 6).

  The outdoor unit 12 includes an outdoor air conditioning unit 13 and a ventilation unit 14 that store an outdoor heat exchanger, an outdoor fan (not shown), and the like. An indoor heat exchanger 15 and an indoor fan 16 are accommodated in the indoor unit 11.

  The various heat exchangers and the heat exchangers are connected to each other through refrigerant pipes (not shown) via various refrigeration equipments to constitute an effective air conditioning refrigeration circuit. Further, between the ventilation unit 14 on the outdoor unit 12 side and the indoor unit 11, outside air from the ventilation unit 14 is supplied to the indoor unit 11 side, and indoor air is supplied to the ventilation unit as necessary. The ventilation duct A for discharging | emitting outside through 14 is provided. The blower duct A includes a communication hose 19 and a blowout nozzle B described later.

  The indoor unit 11 is provided with a main body casing 11a having an indoor air suction grille 17 and an air outlet 18. Inside the main body casing 11a, the indoor heat exchanger 15, the indoor fan 16, and the tips of the blower duct A are provided. A blowing nozzle B for blowing outside air connected to the section is disposed.

  On the other hand, although not shown, the outdoor air conditioning unit 13 is provided with a compressor, a four-way switching valve, an accumulator, an outdoor heat exchanger, an electric expansion valve, an outdoor fan, etc., which are located in the main body casing 13a. It has been. Reference numeral 20 denotes an air outlet provided on the front surface of the main body casing 13 a of the outdoor air conditioning unit 13.

  Further, the ventilation unit 14 includes a flat box-shaped casing 14a having a predetermined height corresponding to the main body casing 13a of the outdoor air conditioning unit 13 and having a predetermined height, and the left side of the front side wall portion of the casing 14a. A space for installing the outside air suction port 21 on the side, an opening 23 penetrating in the vertical direction for inserting and connecting the air blowing flow passage member 22 for supplying outside air from below at the right end of the bottom wall, and a ventilation fan 25 on the inside. 24 are provided.

  The ventilation fan 25 is provided on a lower surface side of the fan motor 26, an impeller 27 that is rotationally driven by the fan motor 26, a fan housing 28 that rotatably stores the impeller 27, and the fan housing 28. The fan motor 26 and the fan housing 28 are, for example, a predetermined support member on the bottom wall portion of the casing 14a. The bell motor 30 and the like form an air suction port 29 to the central shaft portion of the impeller 27. It is supported and fixed through.

  The impeller 27 is formed of, for example, a flattened centrifugal impeller as much as possible, and a plurality of blades according to the rotation direction between the upper disk-shaped hub and the lower donut-plate-shaped shroud. They are arranged side by side in the circumferential direction with a predetermined blade angle and a predetermined blade interval.

  Also, the air inlet side opening edge on the shroud side is loosely fitted in the air inlet 29 side opening edge of the bell mouth 30 bent in a U-shaped cross section so as to be relatively rotatable with a predetermined gap. Yes. As a result, a sealing function of the air passage in the fan housing 28 is realized.

  Further, the fan housing 28 has, for example, a planar scroll shape, and is formed of a continuous surface of a plurality of arc portions each having a different radius, and the air outlet portion has a passage shape positioned on the most downstream side of the scroll portion. It is configured to have an equal diameter in which a tangent line extends from a circular arc surface of the circular arc portion to a predetermined air blowing direction (a right end direction on the front side of the casing 14a).

  And the opening part for connection with the flow member 22 for air blowing is provided in the bottom wall part (specifically right end part of the bellmouth 30) of the exit part of the air blowing outlet, On the other hand, the upper end side air inlet 31 of the air blowing channel member 22 extending downward from above is connected and communicated. The air blowing channel member 22 extends straight down through the opening 23 formed in the bottom plate portion of the casing 14a.

  In the above-described configuration, for example, when the fan motor 26 is driven, the impeller 27 rotates correspondingly, and the outside air sucked from the outside air suction port 29 is converted into the lower surface portion of the fan housing 28. The air is sucked into the impeller 27 from the air suction port 29 formed by the side bell mouth 30 and blown out in the centrifugal direction. Since the fan housing 28 has a scroll structure, the air blown in the centrifugal direction is collected at the air outlet portion located at the front end thereof and extending in the right tangential direction, and in the extending direction. Blown out.

  The air blowing flow path member 22 is connected to a blowing nozzle B disposed on the indoor unit 11 side through a blower duct A.

  As shown in FIGS. 7 to 9, the blowout nozzle B has an air flow W from a large-diameter blowout port 3 having a rectangular shape through an air flow passage portion 2 extending in the width direction from the upstream cylindrical duct portion 1. It is configured to blow out.

  The passage depth in the air flow passage section 2 is configured to gradually become shallower from the upstream side to the downstream side, to become the shallowest in the throat part 2c, and to gradually become deeper from the throat part 2c to the outlet part 3. . It is desirable to set so that H <D, where H is the passage depth in the throat portion 2c and D is the inner diameter of the cylindrical duct portion.

  Further, the outlet portion 1 a of the cylindrical duct portion 1 and the inlet portion 2 a of the air flow passage portion 2 are smoothly connected via an arc portion 7.

  Further, the air outlet 3 of the air outlet nozzle B is disposed on the suction side of the heat exchanger 15 in the indoor unit 11 so as to be parallel to the radiating fins of the heat exchanger 15 via a predetermined gap S. . Reference numeral 6 denotes a filter for removing dust and the like from the blown air flow W.

  As shown in FIGS. 10 and 11, the filter 6 is an integrally molded product of synthetic resin (for example, polypropylene), and has a rectangular frame body 6a and a corrugated filter medium formed integrally with the frame body 6. 6b, and a prefilter 6B made of a porous soft material disposed on the upstream side of the filter body 6A. As the pre-filter 6B, for example, it is desirable to employ a thin laminate of thin fibrous members. In this way, the interference between the blown air flow and the filter 6 is mitigated by the pre-filter 6B, and the operation noise is reduced indoors (1 dBA can be reduced compared to the case where the pre-filter 6B is not used). Contribute. In some cases, a pre-filter 6B may be provided on the downstream side of the filter body 6A.

  Further, an elbow 33 is interposed in a bent portion formed at a connection portion of the cylindrical duct portion 1 in the connecting hose 19 constituting a flow path located on the upstream side of the cylindrical duct portion 1. A sound absorbing material 34 is disposed on the outer peripheral surface having a large curvature radius at 33 (see FIG. 12). In this way, the interference sound generated when the air flow from the upstream side collides with the outer peripheral surface of the elbow 33 having a large radius of curvature is absorbed by the sound absorbing material 34, and the operation sound is reduced indoors. Will contribute more.

Further, the inner diameter D of the cylindrical duct portion 1 is set smaller than the inner diameter D _{0 of the} elbow 33 (see FIGS. 9 and 12). If it does in this way, the airflow which flows through the cylindrical duct part 1 will be rectified, and a driving | running sound can be reduced compared with the case where both internal diameters are made the same. By the way, as shown in FIG. 13, when the relationship between the length L of the cylindrical duct portion 1 and the inner diameter D of the cylindrical duct portion 1 is variously tested, an effect of reducing radiated sound appears when L / D ≧ 2. I understood.

Further, a silencer 35 is interposed at an appropriate position of the communication hose 19 (for example, a position below the air blowing flow path member 22). As shown in FIG. 14, the silencer 35 includes a cylindrical silencer body 35a interposed in the middle of the communication hose 19, and a silencer disposed on the inner peripheral surface of the silencer body 35a ( For example, the length L ₀ of the silencer main body 35a is preferably longer when only the silencing effect is obtained, but is preferably 50 mm or 100 mm in consideration of cost and the like. 100 mm is more desirable. If it does in this way, the passage sound of the airflow which flows through the communication hose 19 will be reduced by the silencer 35, and it can aim at the reduction of the further operation sound. The silencer 35 is installed at an appropriate position of the communication hose 19, but is preferably upstream of the elbow 33.

  In addition, as the communication hose 19, it is preferable that the flexible thing which has an uneven | corrugated shape on an inner surface is acquired at the point from which the silencing effect is acquired.

1 is a schematic diagram showing an overall configuration of an air conditioner including a blower duct according to a first embodiment of the present invention. It is a perspective view of the blowing nozzle part in the ventilation duct concerning 1st Embodiment of this invention. It is the rear view which notched a part of blowing nozzle part in the ventilation duct concerning 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the blowing nozzle part in the ventilation duct concerning 1st Embodiment of this invention. It is a characteristic view which shows the driving | running sound reduction effect in the indoor unit of the air conditioner which employ | adopted the ventilation duct concerning 1st Embodiment of this invention. It is this schematic diagram which shows the whole structure of the air conditioner provided with the ventilation duct concerning 2nd Embodiment of this invention. It is a perspective view of the blowing nozzle part in the ventilation duct concerning 2nd Embodiment of this invention. It is the rear view which notched a part of blowing nozzle part in the ventilation duct concerning the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the blowing nozzle part in the ventilation duct concerning 2nd Embodiment of this invention. It is an expanded sectional view of the filter arrange | positioned at the blowing nozzle part in the ventilation duct concerning 2nd Embodiment of this invention. It is the enlarged front view which excised part of the filter arrange | positioned at the blowing nozzle part in the ventilation duct concerning the 2nd Embodiment of this invention. It is an expanded sectional view of the elbow part in the ventilation duct concerning 2nd Embodiment of this invention. It is a characteristic view which shows the operation sound reduction effect in the indoor unit of the air conditioner which employ | adopted the ventilation duct concerning 2nd Embodiment of this invention. It is an expanded sectional view of the silencer interposed in the connection hose in the ventilation duct concerning the 2nd Embodiment of this invention. It is the rear view which notched a part of blowing nozzle part in the conventional ventilation duct. It is a longitudinal cross-sectional view of the blowing nozzle part in the conventional ventilation duct.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylindrical duct part 1a Outlet part 2 Blast flow path part 2a Inlet part 2b Outlet part 2c Throat part 3 Outlet part 6 Filter 6A Filter body 6B Pre-filter 11 Indoor unit 12 Outdoor Machine 15 is a heat exchanger 19 is a communication hose 33 is an elbow 34 is a silencer 35 is a silencer S is a gap W is an air flow

Claims (10)

A blower duct configured to blow an air flow (W) from a blowout port (3) through a blower channel (2) extending in the width direction from a cylindrical duct (1) on the upstream side, The passage depth in the air flow passage portion (2) becomes gradually shallower from the upstream side to the downstream side, becomes the shallowest in the throat portion (2c), and gradually becomes deeper from the throat portion (2c) to the outlet portion (3). It is comprised so that it may become. The ventilation duct characterized by the above-mentioned. 2. The air duct according to claim 1, wherein H <D is set, where H is a passage depth in the throat portion (2 c) and D is an inner diameter of the cylindrical duct portion (1). 3. 3. The air duct according to claim 2, wherein the air duct is set to satisfy 0.35 ≦ H / D ≦ 0.9. The outlet part (1a) of the said cylindrical duct part (1) and the inlet part (2a) of the said ventilation flow path part (2) were connected smoothly, Any one of Claim 1, 2, and 3 characterized by the above-mentioned. The air duct according to item. While connecting the said cylindrical duct part (1) to the outdoor unit (12) side, the said blower outlet part (3) is a predetermined clearance gap (S) in the suction side of the heat exchanger (15) in an indoor unit (11). The air duct according to any one of claims 1, 2, 3, and 4, wherein the air duct is disposed so as to be parallel to the heat dissipating fins of the heat exchanger (15). The outlet part (2b) of the air flow passage part (2) is configured to expand upward toward the outlet part (3). The ventilation duct as described in any one of these. The air outlet (3) is provided with a filter (6) for removing dust and the like from the air flow W, and at least on the upstream surface side of the filter (6), a prefilter made of a porous soft material (6B) is provided, The ventilation duct as described in any one of Claims 1, 2, 3, 4, 5 and 6 characterized by the above-mentioned. An elbow (33) is interposed in the bent portion formed at the connection portion of the cylindrical duct portion (1) in the connecting hose (19) constituting the flow path located on the upstream side of the cylindrical duct portion (1). In addition, the sound absorbing material (34) is disposed on the outer peripheral surface of the elbow (33) having a large radius of curvature, according to claim 1, 2, 3, 4, 5, 6 and 7. The ventilation duct as described in any one of Claims. The air duct according to claim 8, wherein an inner diameter (D ₀ ) of the cylindrical duct portion (1) is set smaller than an inner diameter (D) of the elbow (33). The blower duct according to any one of claims 8 and 9, wherein a silencer (35) is interposed at an appropriate position of the communication hose (19).

Images