Attracting device

Abstract

To provide an induction device capable of achieving an induction rate over 50%, miniaturizing an air conditioner, reducing a diameter of a duct, and reducing air-conditioning and ventilation energy, in air-conditioning and ventilation of a large space for treating a large amount of air.SOLUTION: An induction device 100 includes a square cylindrical casing 101 disposed in the middle of an air conditioning duct 1, and having an upstream-side connection port 101a to be connected to an upstream-side duct 1a and a downstream-side connection port 101b to be connected to a downstream-side duct 1b. The casing 101 includes a contraction portion 102 having a part of which a cross-sectional area is continuously reduced from an upstream side toward a downstream side, and an enlargement portion 103 connected to the downstream side of the contraction portion 102 and having a part of which a cross-sectional area is continuously increased from the contraction portion 102 toward the downstream side. An upper face wall material 103a and a lower face wall material 103b of the enlargement portion 103 are provided with a plurality of induction ports 105 penetrating through a peripheral wall.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an attracting device that is disposed in the middle of an air-conditioning duct or a ventilation duct used for air-conditioning or ventilation of large facilities such as a dome stadium, an exhibition hall, and a logistics warehouse, and has a function of attracting the air in the space around the duct and mixing it with the primary air flowing in the air-conditioning duct or the ventilation duct.

Background Art

[0002] When air-conditioning or ventilating a large facility such as a dome stadium, an exhibition hall, or a logistics warehouse, it is necessary to process a large air volume using large facilities (such as air-conditioning machines and duct systems). However, in addition to consuming a large amount of energy for air-conditioning or ventilating a large space, there are concerns about increases in the equipment introduction cost and running cost. Also, when constructing large facilities, various problems occur in the transportation of materials (such as air-conditioning machines, air-conditioning ducts, and ventilation ducts) to the air-conditioning and ventilation equipment construction sites.

[0003] For example, the transportation of ducts to the construction site is very inefficient, as if it is ridiculed as "carrying air". However, since the required diameter of the duct is determined according to the air volume, it is difficult to adopt a method of reducing the duct size to improve the transportation efficiency. Such problems tend to become more prominent as the diameter of the duct increases in large facilities that require large-volume air supply.

[0004] Also, in Japan, which has a hot and humid climate, there is always a concern about the occurrence of condensation at the air supply outlets that supply low-temperature air-conditioning air depending on the indoor environment. Therefore, air-conditioning appliances with condensation prevention measures have generally been commercialized by each air-conditioning equipment manufacturer.

[0005] Therefore, as a technology for solving the above-described problems, there has conventionally been a facility (attracting device) provided with an attracting mechanism that attracts the air in the surrounding space such as a duct and mixes it with the air-conditioning air, but it has the following problems.

[0006] (1) The supply air volume is small. As conventional induction devices, there are those that have the function of inducing and mixing the air in the surrounding space with primary air (air - conditioned air). However, many of them are relatively small, such as those that use a method of induction near the air outlet, and there is no large - scale induction device that can handle medium to large air volumes.

[0007] (2) The induced air volume is small. The induction performance (induction rate) of conventional induction devices only reaches about 30% of the primary air, and there is no induction device with an induction performance capable of inducing 50% or more of the primary air.

[0008] For these reasons, at present, there is no induction device with an induction function that is worthy of adoption at construction sites that require air - conditioning and ventilation of a large space with a large air volume.

[0009] On the other hand, regarding induction devices that are arranged in the middle of a duct and have the function of mixing the air induced from the surrounding space with the primary air flowing in the duct, various shapes and structures have been proposed conventionally. As those related to the present invention, for example, there are the "air - conditioning device" described in Patent Document 1 or the "grill - type induction air outlet" described in Patent Document 2.

[0010] The "air - conditioning device" described in Patent Document 1 is an air - conditioning device provided with a fan that blows out the air whose temperature has been adjusted by a temperature - adjusting means from the air outlet to the air - conditioning target area. In the air - delivery duct from the fan to the air outlet, an induction - mixing means is provided that induces and inhales the air within the air - conditioning target area due to the flow of the air delivered from the fan and mixes it with the air delivered from the fan.

[0011] The "grill-type induction air outlet" described in Patent Document 2 includes a main body that attracts and mixes the air in the air-conditioned space with the supplied air sent from the outside and blows out the mixed air into the air-conditioned space. Inside this main body, there are an air outlet for ejecting the supplied air, an induction air passage for introducing the induced air from the air-conditioned space, a mixed blowing air passage for blowing out the mixed air of the supplied air and the induced air into the air-conditioned space, and a plurality of induction ports that communicate with the induction air passage and the mixed blowing air passage and attract the induced air. The plurality of induction ports are arranged such that the air induced and mixed by the upwind-side induction port is sequentially blown into the downwind-side induction port.

Prior Art Documents

Patent Documents

[0012]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0013] The "air conditioner" described in Patent Document 1 has a slit hole for induction provided throughout the entire venturi tube portion, and the entire venturi tube portion is covered by an intake chamber forming box, so the structure is complex. In addition, since this "air conditioner" is connected to a relatively small air conditioner, it is not intended for large-space air conditioning and it is extremely difficult to handle a large air volume.

[0014] The "grill-type induction air outlet" described in Patent Document 2 is of a type that is attached to the end of an air conditioning duct and basically does not target large air volume processing, so it is difficult to achieve an induction rate of 50% or more. In addition, in this "grill-type induction air outlet", the induced air and the air mixed with the conditioned air flow through the same mixed blowing air passage, so interference occurs between the two airflows and losses occur, resulting in the induction rate not being able to exceed 50%.

[0015] Therefore, the problem to be solved by the present invention is to provide an attracting device capable of achieving an attracting rate exceeding 50% in air conditioning and ventilation of a large space that processes a large air volume, and capable of miniaturizing an air conditioner, reducing the diameter of a duct, and reducing air conditioning and ventilation energy.

Means for Solving the Problem

[0016] The first attracting device according to the present invention is an attracting device arranged in the middle of the duct for mixing the air attracted from the surrounding space with the primary air flowing in the air conditioning duct or the ventilation duct, comprising a cylindrical casing having a connection port for connecting to the middle of the duct, the casing including a reducing portion having a portion where the cross-sectional area continuously decreases from the upstream side to the downstream side, and an expanding portion connected to the downstream side of the reducing portion and having a portion where the cross-sectional area continuously increases from the reducing portion toward the downstream side, characterized in that the expanding portion has an attracting port penetrating its peripheral wall.

[0017] With such a configuration, it is possible to reduce the supply amount of the air conditioning air to less than the required amount by attracting and mixing the air in the surrounding space with the primary air flowing in the air conditioning duct or the ventilation duct. Therefore, it is possible to miniaturize the air conditioner, reduce the size of the duct, and reduce the air conditioning and ventilation energy. Further, by attracting the air in the surrounding space, the air in the surrounding space is mixed with the primary air, and the temperature of the mixed air becomes higher than that of the primary air on the upstream side. Therefore, particularly when cooling is performed, the possibility of dew condensation occurring in the downstream duct after attraction can be reduced.

[0018] Furthermore, since the casing can integrally form the reducing portion and the expanding portion, the structure is simple, and since the reducing portion serves as a nozzle, it is possible to promote the attraction of the air in the surrounding space.

[0019] On the one hand, since the inclined surface of the reduced portion exerts a guiding function of attracting the air in the surrounding space toward the suction port, smooth attraction can be realized. Since the casing has a shape integrally formed of a reduced portion and an enlarged portion, it is only necessary to provide heat insulation means on the outer surface of the device, and there is no need to separately provide heat insulation means for the nozzle portion as in the conventional method (for example, a double method of installing a nozzle in a duct). Since the air flow passing through the reduced portion spreads into the duct along the inner surface of the enlarged portion, the mixing of the primary air and the induced air is promoted, and the length of the duct on the secondary side (downstream side of the enlarged portion) can be shortened.

[0020] The entire casing has a shape in which the boundary portion between the reduced portion and the enlarged portion is constricted, and since there is an induction port on the peripheral wall of the enlarged portion on the downstream side of the boundary portion, even if there are obstacles (for example, a housing or a duct) around the induction device, the space around the induction port is not obstructed (a space with a predetermined width can be secured around the induction port), so a reliable induction effect can be obtained.

[0021] Also, since the boundary portion between the reduced portion and the enlarged portion of the casing has a constricted shape, even if there are obstacles around the induction device, it is possible to bring a hand close to the vicinity of the boundary portion and touch the induction port etc., so the maintainability is also good.

[0022] The second induction device according to the present invention is an induction device arranged in the middle of the duct for mixing the air induced from the surrounding space with the primary air flowing in the air conditioning duct or the ventilation duct, a cylindrical casing having a connection port for connecting in the middle of the duct, a nozzle disposed in the casing in a state of communicating with the duct located on the upstream side, and having a reduced portion whose cross-sectional area continuously decreases from the upstream side to the downstream side of the duct, wherein the casing has an induction port penetrating its peripheral wall.

[0023] With such a configuration, by attracting and mixing the air in the surrounding space into the primary air flowing in the air-conditioning duct or the ventilation duct, it becomes possible to reduce the primary-side supply air volume below the required amount. Therefore, it is possible to reduce the size of the air conditioner, the size of the duct, and the air-conditioning and ventilation energy. Further, by attracting the air in the surrounding space, the air in the surrounding space is mixed into the primary air, and the temperature of the mixed air becomes higher than that of the primary air on the upstream side. Therefore, especially when cooling is performed, the possibility of dew condensation in the downstream duct after attraction can be reduced.

[0024] Furthermore, it can be composed of a casing communicating with the duct and a nozzle having a reduced portion, so the structure is simple. In addition, since the external shape of the casing and the external shape of the duct can be made equivalent, the sense of incongruity when disposed in the middle of the duct is suppressed, and the appearance as a duct is not impaired.

[0025] In the first attracting device and the second attracting device, it is desirable that the reduction angle of the reduced portion (the included angle between the wall materials arranged oppositely to form the reduced portion) is 20 degrees to 80 degrees.

[0026] In such a configuration, when the reduction angle is increased (approaching 80 degrees), the pressure loss of the reduced portion can be suppressed within a certain range while making the reduced portion more compact. Also, when the reduction angle is decreased (approaching 20 degrees), the pressure loss of the reduced portion can be further reduced, the load on the air-conditioning equipment can be reduced, and energy saving can be achieved.

[0027] Regarding the second attracting device, it is desirable to provide the attracting port at a portion of the cylindrical peripheral wall of the casing that surrounds the downstream end of the nozzle.

[0028] With such a configuration, the amount of air attracted through the attraction port can be increased, and the attraction effect can be improved. In addition, the air in the surrounding space that has flowed into the casing through the attraction port is guided along the outer surface of the nozzle to the downstream duct, promoting the mixing with the primary air, so that a high attraction rate and a low pressure loss can be achieved.

[0029] In the first attraction device and the second attraction device, a guide vane for guiding the air in the surrounding space into the casing can be provided at the attraction port.

[0030] With such a configuration, the air in the surrounding space can be smoothly guided (introduced) into the casing, improving the attraction efficiency.

Advantages of the Invention

[0031] According to the present invention, in the air conditioning and ventilation of a large space that processes a large air volume, an attraction rate exceeding 50% can be achieved, and an attraction device capable of miniaturizing the air conditioner, reducing the diameter of the duct, and reducing the air conditioning and ventilation energy can be provided.

Brief Description of the Drawings

[0032]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0033] Hereinafter, based on FIGS. 1 to 12, the attracting devices 100, 200, 250, 300, 400 which are embodiments of the present invention will be described.

[0034] First, the attracting device 100 will be described based on FIGS. 1 and 2. As shown in FIG. 1, the attracting device 100 is arranged in the middle of the air-conditioning duct 1 (between the upstream duct 1a and the downstream duct 1b) in order to mix the air attracted from the surrounding space with the air-conditioning air (primary air) flowing in the air-conditioning duct 1. The attracting device 100 includes a rectangular tubular casing 101 having an upstream connection port 101a for connecting to the upstream duct 1a and a downstream connection port 101b for connecting to the downstream duct 1b. In addition, in FIG. 1, the arrow line H is in the height direction and the arrow line W is in the width direction (the same applies hereinafter).

[0035] The upstream connection port 101a and the downstream connection port 101b are each in a flange shape, and the upstream connection port 101a and the upstream duct 1a as well as the downstream connection port 101b and the downstream duct 1b are connected to each other using bolts, nuts, clips (not shown), etc.

[0036] The casing 101 integrally includes a reduced portion 102 having a portion where the cross-sectional area continuously decreases from the upstream side to the downstream side, and an enlarged portion 103 having a portion where the cross-sectional area continuously increases from the reduced portion 102 toward the downstream side. The interior of the casing 101 is partitioned into a plurality of flow paths by a plurality of partition plates 104 arranged upright along the flow direction of the air-conditioning air SA. A plurality of suction ports 105 penetrating the wall materials are formed in the upper wall material 103a and the lower wall material 103b arranged opposite to each other to form the enlarged portion 103.

[0037] As shown in FIG. 2, the reduced portion 102 is formed by arranging the upper wall material 102a and the lower wall material 102b opposite to each other, and the reduction angle R1 (the included angle between the upper wall material 102a and the lower wall material 102b) of the reduced portion 102 is 60 degrees. Also, the enlargement angle L1 (the included angle between the upper wall material 103a and the lower wall material 103b) of the enlarged portion 103 is 30 degrees.

[0038] As shown in FIG. 2, when the air-conditioning air SA flowing in the upstream duct 1a passes through the induction device 100 and flows into the downstream duct 1b, the air OA in the surrounding space is attracted toward the plurality of suction ports 105, flows into the enlarged portion 103 via the suction ports 105, is mixed with the air-conditioning air SA flowing from the upstream duct 1a, and becomes the mixed air MA of the air-conditioning air SA and the air OA in the surrounding space, and flows toward the downstream duct 1b.

[0039] In this way, by attracting and mixing the air OA in the surrounding space with the air-conditioning air SA flowing through the air-conditioning duct 1, it becomes possible to reduce the primary-side supply air volume (air-conditioning air SA) below the required amount, so that the air conditioner (not shown) can be miniaturized, the air-conditioning duct 1 can be made smaller in size, and the air-conditioning energy can be reduced. Also, during the cooling operation, when the air OA in the surrounding space is attracted, the air OA in the surrounding space is mixed with the air-conditioning air SA, and the temperature of the mixed air MA becomes higher than that of the air-conditioning air SA in the upstream duct 1a, so that the possibility of dew condensation in the downstream duct 1b after the attraction can be reduced.

[0040] Furthermore, since the casing 101 can be constituted by the reduced portion 102 and the enlarged portion 103, the structure is simple. In addition, since the reduced portion 102 serves as a nozzle, it is possible to promote the attraction of the air OA in the surrounding space, and since the reduced portion 102 and the enlarged portion 103 are integrated, the structure can be simplified. Also, the plurality of partition plates 104 arranged inside the casing 101 have the function of rectifying the conditioned air SA and the mixed air MA after attraction, and also exhibit the reinforcing function of the casing 101.

[0041] On the other hand, since the upper wall material 102a and the lower wall material 102b of the reduced portion 102 exhibit the guide function of directing the air OA in the surrounding space toward the attraction port 105, smooth attraction can be realized. Since the casing 101 has a shape in which the enlarged portion 103 is integrally formed from the reduced portion 102, the heat insulation means may be provided only on the outer surface of the device, and there is no need to separately provide heat insulation means for the nozzle portion as in the conventional method (for example, a double method in which a nozzle is installed in an air-conditioning duct).

[0042] The air flow (the mixed air flow of the conditioned air SA and the air OA in the surrounding space) that has passed through the reduced portion 102 spreads along the inner surface of the enlarged portion 103 toward the downstream duct 1b, so that the mixing of the conditioned air SA and the attracted air (the air OA in the surrounding space) is promoted, and the length of the secondary-side air-conditioning duct (the downstream duct 1b) can be shortened.

[0043] In the attracting device 100, since the reduction angle R1 (the included angle between the upper wall material 102a and the lower wall material 102b) of the reduced portion 102 is set to 60 degrees, the attracting device 100 can be made compact while suppressing the pressure loss of the attracting device 100 within a certain range.

[0044] In FIG. 2, the size in the width direction W (see FIG. 1) of the air-conditioning duct 1 is 900 mm, the size in the height direction H is 400 mm, the size in the width direction W of the tip portion 102c of the reduced portion 102 (the portion where the cross-sectional area of the reduced portion 102 is the smallest) is 900 mm, and the size in the height direction H is 177 mm.

[0045] In the arrangement state shown in Fig. 2, conditioned air SA with an air volume of 8000 m 3 / h (wind speed of 13.9 m / s at the tip 102c of the constriction 102) is supplied from the upstream duct 1a, and when the total air volume of the mixed air MA flowing through the downstream duct 1b is measured, the measurement result is 13200 m 3 / h (pressure loss of the attracting device 100 is 135 Pa), and it was found that an attraction rate of 65% was achieved. The above-mentioned attraction rate (%) is a value calculated based on the following formula. Attraction rate (%) = { (total air volume of mixed air MA - air volume of conditioned air SA) / (air volume of conditioned air SA)} × 100

[0046] In this way, by arranging the attracting device 100 in the middle of the air-conditioning duct 1, a high attraction rate can be achieved, so that a large air volume can be processed. If an adjustment mechanism capable of changing the opening degree of the attracting port 105 is provided, it is possible to adjust the amount of attracted ambient air OA according to the situation of the air-conditioned space, enabling fine air-conditioning.

[0047] Although the arrangement state of the attracting device 100 is not limited, for example, as shown in Figs. 3 and 4, a branch duct 2 is connected to the downstream side of the downstream duct 1b connected to the downstream connection port 101b of the attracting device 100, and air outlets 3 can be provided at a plurality of locations of the branch duct 2 according to the scale and structure of the air-conditioned space. In addition, grid members 106 can be respectively attached to the attracting ports 105 of the attracting device 100 to prevent foreign matter from entering the duct.

[0048] In this way, it is possible to supply the mixed air MA in which the ambient air OA is mixed with the conditioned air SA from the air outlet 3 installed in the target air-conditioned space, so that in particular, large-volume air-conditioning and ventilation in large facilities such as dome stadiums, exhibition halls, and logistics warehouses can be realized.

[0049] Note that since the aspect ratios of the upstream connection port 101a and the downstream connection port 101b of the casing 101 of the attracting device 100 are not limited, they can be set corresponding to the aspect ratio of the cross section of the air conditioning duct 1 connected to the attracting device 100.

[0050] As shown in FIGS. 1 and 2, the casing 101 constituting the attracting device 100 has a shape in which the boundary portion (near the tip portion 102c of the reducing portion 102) between the reducing portion 102 and the expanding portion 103 is constricted, and an attracting port 105 is provided on the peripheral wall of the expanding portion 103 on the downstream side of the boundary portion. Thus, even when there are obstacles (for example, a building body or a duct) around the attracting device 100, a space with a predetermined width can be secured around the attracting port 105, so that a reliable attracting effect can be obtained.

[0051] In addition, since the boundary portion (near the tip portion 102c of the reducing portion 102) between the reducing portion 102 and the expanding portion 105 of the casing 101 has a constricted shape, even when there are obstacles around the attracting device 100, it is possible to bring a hand close to the vicinity of the constricted portion and touch the attracting port 105 or the like, so that the maintainability is also good.

[0052] Next, with reference to FIGS. 5 and 6, the attracting device 200 which is the second embodiment will be described. Note that parts and functions of the attracting device 200 that are the same as those of the attracting device 100 described above may be denoted by the same reference numerals as those shown in FIGS. 1 and 2, and the description may be omitted.

[0053] As shown in FIG. 5, the attracting device 200 is disposed in the middle of the air conditioning duct 1 (between the upstream duct 1a and the downstream duct 1b) in order to mix the air attracted from the surroundings into the air conditioning air flowing in the air conditioning duct 1. The attracting device 200 includes a rectangular cylindrical casing 201 having an upstream connection port 201a for connecting to the upstream duct 1a and a downstream connection port 201b for connecting to the downstream duct 1b.

[0054] The upstream connection port 201a and the downstream connection port 201b are each flange-shaped, and the upstream connection port 201a and the upstream duct 1a, as well as the downstream connection port 201b and the downstream duct 1b, are connected using bolts, nuts, clips (not shown), etc., respectively.

[0055] The casing 201 includes a reduced portion 202 having a portion where the cross-sectional area continuously decreases from the upstream side to the downstream side, and an enlarged portion 203 connected to the downstream side of the reduced portion 202 and having a portion where the cross-sectional area continuously increases from the reduced portion 202 toward the downstream side. The interior of the casing 201 is partitioned into a plurality of flow paths by a plurality of partition plates 204 arranged upright along the flow direction of the conditioned air. A plurality of suction ports 105 penetrating the wall material are provided in the upper wall material 203a and the lower wall material 203b of the enlarged portion 203.

[0056] As shown in FIG. 6, the reduced portion 202 is formed by opposing the upper wall material 202a and the lower wall material 202b, and the reduction angle R2 (the included angle between the upper wall material 202a and the lower wall material 202b) of the reduced portion 202 is 30 degrees, and the enlargement angle L2 (the included angle between the upper wall material 203a and the lower wall material 203b) of the enlarged portion 203 is 30 degrees.

[0057] As shown in FIG. 6, when the conditioned air SA flowing in the upstream duct 1a passes through the suction device 200 and flows into the downstream duct 1b, the air OA in the surrounding space is attracted toward the plurality of suction ports 205, flows into the enlarged portion 203 via the suction ports 205, is mixed with the conditioned air SA flowing from the upstream duct 1a, and becomes the mixed air MA of the conditioned air SA and the air OA in the surrounding space and flows toward the downstream duct 1b.

[0058] Therefore, similar to the suction device 100 shown in FIGS. 1 and 2, the suction device 200 can achieve a high suction rate and a low pressure loss with a simple structure, and can contribute to the miniaturization of an air conditioner (not shown), the reduction in the diameter of the air conditioning duct 1, and the reduction of air conditioning energy.

[0059] In the attracting device 200, since the reduction angle R2 of the reducing portion 202 is set to 30 degrees, the pressure loss of the attracting device 200 can be reduced, the load on the air conditioning equipment (not shown) can be reduced, and energy saving can be achieved.

[0060] In FIG. 6, the size in the width direction W (see FIG. 5) of the duct 1 is 900 mm, the size in the height direction H is 400 mm, the size in the width direction W of the tip portion 202c of the reducing portion 202 (the portion where the cross-sectional area of the reducing portion 202 is the smallest) is 900 mm, and the size in the height direction H is 177 mm.

[0061] In the arrangement state as shown in FIG. 6, when supplying air-conditioning air SA with an air volume of 8000 m 3 / h (wind speed of 13.9 m / s at the tip portion 202c of the reducing portion 202) from the upstream duct 1a and measuring the total air volume of the mixed air MA flowing through the downstream duct 1b, a measurement result of 12720 m 3 / h (pressure loss of the attracting device 200 is 110 Pa) is obtained, and it is found that an attraction rate of 59% is achieved. Thus, by arranging the attracting device 200 in the middle of the air-conditioning duct 1, while maintaining a high attraction rate, the increase in pressure loss of the duct system can be suppressed, and the load on the air conditioner can be reduced.

[0062] Next, based on FIG. 7, the attracting device 250 which is another embodiment will be described. Regarding the parts and functions constituting the attracting device 250, for the parts common to the attracting device 100 described above, there are parts where the same reference numerals as those shown in FIGS. 1 and 2 are used and the description is omitted.

[0063] As shown in Fig. 7, the attracting device 250 includes a casing 251 in which a reduced portion 252 and an enlarged portion 253 are formed, similar to the attracting device 200 shown in Fig. 6. Guide vanes 256 are provided at a plurality of attracting ports 255 formed in the upper wall member 253a and the lower wall member 253b of the enlarged portion 253. In the attracting device 250, by providing the guide vanes 256 at the attracting ports 255 of the enlarged portion 253, the air OA in the surrounding space can be rectified and guided into the enlarged portion 253, so that the attraction of the air OA in the surrounding space can be promoted and stabilized. Although the shape, structure, etc. of the guide vanes 256 are not limited, for example, a part of the upper wall member 253a and the lower wall member 253b of the enlarged portion 253 of the casing 201 made of a steel plate can be cut up and bent at a predetermined angle to form them.

[0064] Next, based on Figs. 8, 9, and 10, the attracting device 300 which is the third embodiment will be described. Note that for the parts and functions constituting the attracting device 300, the parts common to the attracting device 100 described above may be denoted by the same reference numerals as those shown in Figs. 1 and 2, and the description may be omitted.

[0065] As shown in Figs. 8 and 9, the attracting device 300 is arranged in the middle of the air-conditioning duct 1 (between the upstream duct 1a and the downstream duct 1b) in order to mix the air attracted from the surroundings with the air-conditioning air flowing in the air-conditioning duct 1. The attracting device 300 includes a rectangular tube-shaped casing 301 having an upstream connection port 301a for connecting to the upstream duct 1a and a downstream connection port 301b for connecting to the downstream duct 1b.

[0066] The upstream connection port 301a and the downstream connection port 301b are each in a flange shape, and the upstream connection port 301a and the upstream duct 1a, as well as the downstream connection port 301b and the downstream duct 1b, are connected using bolts, nuts, clips (not shown), etc., respectively.

[0067] The casing 301 includes a reduced portion 302 having a portion where the cross-sectional area continuously decreases from the upstream side to the downstream side, and an enlarged portion 303 connected to the downstream side of the reduced portion 302 and having a portion where the cross-sectional area continuously increases from the reduced portion 302 toward the downstream side. The interior of the casing 301 is partitioned into a plurality of flow paths by a plurality of partition plates 304 arranged upright along the flow direction of the air-conditioning air. A plurality of suction ports 305 penetrating the peripheral wall are formed in the upper surface wall member 303a and the lower surface wall member 303b of the enlarged portion 303.

[0068] As shown in FIGS. 8 and 9, in the reduced portion 302 of the suction device 300, the upper surface wall member 302a and the lower surface wall member 302b are inclined and arranged to face each other so as to approach each other toward the downstream side, and the side surface wall members 302c and 302d are also inclined and arranged to face each other so as to approach each other toward the downstream side.

[0069] In FIG. 10, the size in the width direction W (see FIG. 8) of the duct 1 is 900 mm, the size in the height direction H is 400 mm, the size in the width direction W of the tip portion 302e of the reduced portion 302 (the portion where the cross-sectional area of the reduced portion 302 is the smallest) is 722 mm, and the size in the height direction H is 222 mm.

[0070] As shown in FIG. 9, the narrowing angle N1 (the included angle between the side surface wall members 302c and 302d) in the reduced portion 302 is 30 degrees, and the widening angle N2 (the included angle between the side surface wall members 303c and 303d) in the enlarged portion 303 is 30 degrees. Further, as shown in FIG. 10, the reduction angle R3 (the included angle between the upper surface wall member 302a and the lower surface wall member 302b) of the reduced portion 302 is 30 degrees, and the enlargement angle L3 (the included angle between the upper surface wall member 303a and the lower surface wall member 303b) of the enlarged portion 303 is 30 degrees.

[0071] As shown in Fig. 10, when the conditioned air SA flowing in the upstream duct 1a passes through the attracting device 300 and flows into the downstream duct 1b, the air OA in the surrounding space is attracted toward the plurality of attracting ports 305, flows into the enlarged portion 303 via the attracting ports 305, is mixed with the conditioned air SA flowing from the upstream duct 1a, and becomes the mixed air MA of the conditioned air SA and the air OA in the surrounding space and flows toward the downstream duct 1b.

[0072] Therefore, similar to the attracting device 100 shown in Figs. 1 and 2, the attracting device 300 can achieve a simple structure, a high attracting rate, and a low pressure loss, and can reduce the size of the air conditioner (not shown), reduce the diameter of the air conditioning duct 1, and reduce the air conditioning energy. In the attracting device 300, along the feeding direction of the conditioned air SA in the air conditioning duct 1, the upper wall material 302a, the lower wall material 302b, and the side wall materials 302c and 302d are inclined so as to be constricted, so that the attracting device 300 can be compactly accommodated.

[0073] Also, as shown in Fig. 10, since the reduction angle R3 (the included angle between the upper wall material 302a and the lower wall material 302b) of the reduced portion 302 is set to 30 degrees, the pressure loss of the attracting device 300 can be reduced.

[0074] In the arrangement state shown in Fig. 10, when supplying the conditioned air SA with an air volume of 8000 m 3 / h (wind speed of 13.9 m / s at the tip 302c of the reduced portion 302) from the upstream duct 1a and measuring the total air volume of the mixed air MA flowing through the downstream duct 1b, a measurement result of 12240 m 3 / h (pressure loss of the attracting device 300 is 105 Pa) is obtained, and it is found that an attracting rate of 53% is achieved. Thus, by arranging the attracting device 300 in the middle of the air conditioning duct 1, while maintaining a high attracting rate, an increase in the pressure loss of the duct system can be suppressed, and the load on the air conditioner can be reduced.

[0075] Next, based on FIGS. 11 and 12, the attracting device 400, which is the fourth embodiment, will be described. Note that, regarding the components and functions constituting the attracting device 400, parts common to the attracting device 100 described above may be denoted by the same reference numerals as those shown in FIGS. 1 and 2, and the description thereof may be omitted.

[0076] As shown in FIG. 11, the attracting device 400 is disposed in the middle of the air-conditioning duct 1 (between the upstream duct 1a and the downstream duct 1b) to mix the air OA attracted from the surroundings with the air-conditioning air SA flowing in the air-conditioning duct 1. The attracting device 400 includes a rectangular tube-shaped casing 401 having an upstream connection port 401a for connecting to the upstream duct 1a and a downstream connection port 401b for connecting to the downstream duct 1b, and a nozzle 402 disposed in the casing 401 in a state of communicating with the upstream duct 1a.

[0077] The connection between the attracting device 400, the upstream duct 1a, and the downstream duct 1b can adopt a method such as inserting the upstream connection port 401a (downstream connection port 401b) into the upstream duct 1a (downstream duct 1b) and fixing it with fixing means such as screws (not shown).

[0078] Attracting ports 405 penetrating through the respective wall materials are formed in the upper surface wall material 401c, the lower surface wall material 401d, and the side surface wall materials 401e and 401f of the casing 401, and a lattice member 406 is attached to the attracting ports 405.

[0079] The nozzle 402 is arranged such that its upper surface wall material 402a and lower surface wall material 402b are inclined so as to approach each other toward the downstream connection portion 401b, thereby forming a reduced portion with a continuously decreasing cross-sectional area from the upstream side to the downstream side of the air-conditioning duct 1. As shown in FIG. 12, the reduction angle R4 (the included angle between the upper surface wall material 402a and the lower surface wall material 402b) in the nozzle 402 is set to 50 degrees, but it is not limited thereto.

[0080] As shown in FIG. 11, in the attracting device 400, two nozzles 402, 402 are arranged side by side in the casing 401. However, since it is not limited to this, two nozzles can be arranged vertically in the casing 401, or one nozzle can be arranged. When arranging one nozzle, a partition plate can be appropriately arranged upright along the flow direction of the air-conditioning air SA in the nozzle (for example, refer to the partition plate 104 in FIG. 1).

[0081] As shown in FIG. 12, when the air-conditioning air SA flowing in the upstream duct 1a flows into the attracting device 400, the air-conditioning air SA flows into the nozzle 402, and the air-conditioning air SA flows out downstream from the nozzle 402, whereby the air OA in the surrounding space is attracted toward a plurality of attracting ports 405, flows into the attracting device 400 via the attracting ports 405, is mixed with the air-conditioning air SA flowing from the upstream duct 1a, and becomes the mixed air MA of the air-conditioning air SA and the air OA in the surrounding space and flows toward the downstream duct 1b.

[0082] Therefore, similar to the attracting device 100 shown in FIGS. 1 and 2, the attracting device 400 can achieve a high attracting rate and a low pressure loss with a simple structure, and can contribute to the miniaturization of an air conditioner (not shown), the reduction in the diameter of the air-conditioning duct 1, and the reduction of air-conditioning energy. Further, since the attracting device 400 can be composed of a casing 401 communicating with the air-conditioning duct 1 and a nozzle 402 having a reduced portion, the structure is simple and it can be made smaller than the above-described attracting devices 100, 200, 300, etc.

[0083] Furthermore, since the appearance of the casing 401 is such that the attracting ports 405 can be seen, the appearance shape of the casing 401 can be made equivalent to the appearance shape of the air-conditioning duct 1, the sense of incongruity when arranged in the middle of the air-conditioning duct 1 is suppressed, and the appearance and aesthetic property of the air-conditioning duct 1 are not impaired.

[0084] In FIGS. 11 and 12, the size of the duct 1 in the width direction W (see FIG. 11) is 900 mm, and the size in the height direction H is 400 mm. The size of the tip 402c of the two nozzles 402 (the part where the cross-sectional area of the nozzle 402 is the smallest) in the width direction W is 400 mm, and the size in the height direction H is 200 mm.

[0085] In the arrangement shown in FIG. 12, conditioned air SA with an air volume of 8000 m 3 / h (air velocity of 13.9 m / s at the tip 402c of the nozzle 402) is supplied from the upstream duct 1a, and when the total air volume of the mixed air MA flowing through the downstream duct 1b is measured, a measurement result of 12000 m 3 / h (pressure loss of the attracting device of 100 Pa) is obtained, and it is found that an attraction rate of 50% is achieved. Thus, by arranging the attracting device 400 in the middle of the air-conditioning duct 1, it is possible to suppress an increase in the pressure loss of the duct system while maintaining a high attraction rate, and reduce the load on the air conditioner.

[0086] As shown in FIG. 11, in the casing 401 of the attracting device 400, an attracting port 405 is opened in the region surrounding the tip 402c of the nozzle 402. As shown in FIG. 12, when the attracting device 400 is viewed from the side, the position of the center line 405c of the attracting port 405 in the front-rear direction D of the casing 401 and the position of the tip 402c of the nozzle 402 are arranged to coincide. By adopting such an arrangement, the highest attraction rate can be obtained.

[0087] Since the attracting devices 100, 200, 250, 300, 400 described with reference to FIGS. 1 to 12 are used by being connected to the rectangular tube-shaped air-conditioning duct 1, the respective casings 101, 201, 251, 301, 401 are all rectangular tube-shaped, but the present invention is not limited thereto, and it can be applied to air-conditioning ducts (not shown) having a cylindrical or other shape.

[0088] The attracting devices 100, 200, 250, 300, 400 described with reference to FIGS. 1 to 12 are examples of the attracting device according to the present invention, and the attracting device according to the present invention is not limited to the attracting devices 100, 200, 250, 300, 400 described above.

[0089] In addition, although the attracting devices 100, 200, 250, 300, 400 shown in FIGS. 1 to 12 have been described for the case where they are installed in the middle of the air-conditioning duct 1, the present invention is not limited to this application, and it is also possible to install them in the middle of a ventilation duct (not shown), and the same operations and effects as described above can be obtained.

Industrial Applicability

[0090] The attracting device according to the present invention can be widely used as a part of an air-conditioning system or a ventilation system for large facilities such as a dome stadium, an exhibition hall, and a logistics warehouse.

Explanation of Reference Numerals

[0091] 1 Air-conditioning duct 1a Upstream duct 1b Downstream duct 2 Branch duct 3 Outlet 100, 200, 250, 300, 400 Attracting device 101, 201, 301, 401 Casing 101a, 201a, 301a, 401a Upstream connection port 101b, 201b, 301b, 401b Downstream connection port 102, 202, 252, 302 Reducing portion 102a, 103a, 202a, 253a, 302a, 401c, 402a Upper wall material 102b, 103b, 202b, 253b, 302b, 401b, 402b Lower wall material 102c, 202c, 302e Tip portion 103, 203, 303, 253 Enlarging portion 104, 204, 304 Partition plate 105, 205, 255, 305, 405 Attracting port 106,406 grid members 256 guide vanes 302c, 302d, 303c, 303d, 401e, 401f side wall materials 402 nozzles 402c nozzle tip 405c center line D front - rear direction H height direction W width direction N1 narrowing angle N2 widening angle R1, R2, R3, R4 reduction angles L1, L2, L3 expansion angles SA air - conditioning air OA air in the surrounding space MA mixed air

Claims

1. An attracting device arranged in the middle of a duct for mixing air attracted from the surrounding space with primary air flowing in a rectangular air-conditioning duct or a rectangular ventilation duct, comprising a substantially square cylindrical casing having a connection port for connecting in the middle of the duct, the casing comprising a reduced portion having a portion where the cross-sectional area continuously decreases from the upstream side to the downstream side, and an enlarged portion connected to the downstream side of the reduced portion and having a portion where the cross-sectional area continuously increases from the reduced portion toward the downstream side, the casing having a partition plate arranged upright for partitioning the flow path in the casing, and an attracting device having an attracting port penetrating only the peripheral wall of the enlarged portion.

2. The attracting device according to claim 1, wherein the reduction angle of the reduced portion (the included angle between the wall materials arranged oppositely to form the reduced portion) is 20 degrees to 80 degrees.

3. The attracting device according to claim 1 or 2, wherein a guide vane for guiding air in the surrounding space into the casing is provided at the attracting port.

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