FI127646B - A supply air device - Google Patents

A supply air device Download PDF

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Publication number
FI127646B
FI127646B FI20155928A FI20155928A FI127646B FI 127646 B FI127646 B FI 127646B FI 20155928 A FI20155928 A FI 20155928A FI 20155928 A FI20155928 A FI 20155928A FI 127646 B FI127646 B FI 127646B
Authority
FI
Finland
Prior art keywords
nozzle
supply air
channel structure
nozzle channel
air
Prior art date
Application number
FI20155928A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI20155928A (en
Inventor
Jari Heinovaara
Original Assignee
Sandbox Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sandbox Oy filed Critical Sandbox Oy
Priority to FI20155928A priority Critical patent/FI127646B/en
Priority to CN201680072089.XA priority patent/CN108431508B/en
Priority to PCT/FI2016/050862 priority patent/WO2017098088A1/en
Priority to EP16872476.3A priority patent/EP3387329B1/en
Publication of FI20155928A publication Critical patent/FI20155928A/en
Application granted granted Critical
Publication of FI127646B publication Critical patent/FI127646B/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/01—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station in which secondary air is induced by injector action of the primary air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/26—Arrangements for air-circulation by means of induction, e.g. by fluid coupling or thermal effect

Abstract

The invention relates to a supply air device (60) comprising: a nozzle channel structure (63) comprising at least one nozzle and a mixing chamber (65). The nozzle channel structure (63) is arranged in a distance from the bottom of the device forming a circulation space (69) between the bottom of the device and the nozzle channel structure (63). Primary air (61) is led to the nozzle channel structure (63) and further to the mixing chamber (65) as at least one primary air (61) flow. Primary air (61) flow entrains secondary air (66a, 66b) to flow to the mixing chamber (65) and at least a part of secondary air (66a, 66b) flows to the mixing chamber (65) through the circulation space (69), wherein the primary air (61) and secondary air (66a, 66b) are arranged to be mixed in the mixing chamber (65) before flowing out of the supply air device (60). The invention further relates to a nozzle channel structure (63) arranged to be used in a supply air device (60).

Description

A supply air device
Field of the invention
The present invention relates to a supply air device comprising a nozzle channel structure directing a supply air flow into a room. The supply air flow comprises primary air and secondary air. The primary air flow entrains a flow of secondary air flow from the room to flow to the supply air device and further to return to the room. Furthermore, the 10 invention relates to a nozzle channel structure for a supply air device.
Background
For temperature controlling of rooms, it has become common to 15 provide the rooms with supply air devices, wherein primary air supplied from a central ventilation system is blown from nozzles inside the supply air device to be mixed in a discharge channel with a secondary air flow from the room entrained by the supply air flow. The air mixture formed by the primary and secondary air is led from the supply air 20 device into the room as the supply air flow. The secondary air entrained from the room enters the supply air device via a temperature controlling device which enables the temperature controlling of the secondary air. This kind of supply air device controls internal thermal conditions of the room.
In some cases the secondary air is led instead of or in addition to a temperature controlling device through a filter in order to remove impurities from indoor air. The filter causes a flow resistance, which is not advantageous for the function of the supply air device. The flow 30 resistance reduces the amount of secondary air flow, wherein the filtered secondary air flow does not have a significant effect on the quality of indoor air or temperature of indoor air, when the supply air device comprises a temperature controlling device. In other words, the filter of the supply air device restricts the secondary air flowing through 35 the filter, resulting in an excessive reduction in removing impurities and
20155928 prh 08 -10- 2018 in the temperature controlling efficiency of the supply air device comprising the temperature controlling device.
By increasing the primary air flow of the central ventilation system, it 5 may be possible to increase the secondary air flow and therefore air purification and/or temperature controlling that is cooling or heating. However, among other things, increasing the primary air flow increases energy consumption and may lead to a need for bigger channels for the air flows of the central ventilation system. Increase of the primary 10 air flow can also increase the size of the ventilation system, for example, size of air ducts and/or air handling units.
Summary
It is an aim of the present invention to provide a novel nozzle channel structure increasing an air circulating efficiency (secondary air flow (litres/second (l/s))/ primary air flow (l/s)) of a supply air device. The nozzle channel structure is arranged to be fixed in a distance from the bottom of the supply air device forming a circulation space between the 20 bottom of the supply air device and the nozzle channel structure for secondary air flows. It is another aim of the present invention to provide a supply air device comprising the novel nozzle channel structure.
According to a first embodiment, there is provided a supply air device 25 comprises a nozzle channel structure comprising at least one nozzle and a mixing chamber. The nozzle channel structure is arranged in a distance from the bottom of the supply air device forming a circulation space between the bottom of the supply air device and the nozzle channel structure. Primary air is led to the nozzle channel structure and 30 from the nozzle channel structure to the mixing chamber through said at least one nozzle as at least one primary air flow. Said at least one primary air flow entrains secondary air from outside the supply air device to flow to the mixing chamber through the circulation space and the primary air and secondary air are arranged to be mixed in the 35 mixing chamber before flowing out of the supply air device. The nozzle channel structure is a duct system comprising at least one duct which
20155928 prh 08 -10- 2018 comprises the plurality of nozzles provided as perforations to the nozzle channel structure and wherein cross-section of at least one duct of the nozzle channel structure is circular or oval.
According to an embodiment, the supply air device comprises two or more nozzle channel structures with separate mixing chambers.
According to an embodiment, the nozzle channel structure comprises a plurality of nozzles. According to an embodiment, the nozzle channel structure comprises a slit nozzle. According to an embodiment, the 10 nozzle channel structure is a peripherally closed duct system.
According to an embodiment, the nozzle channel structure comprises at least two separate duct sections. According to an embodiment, the nozzle channel structure is formed from a duct having straight shape. According to an embodiment, the nozzle channel structure comprises 15 separate ducts. According to an embodiment, the supply air device further comprises a filter.
According to a second embodiment, there is provided a nozzle channel structure. The nozzle channel structure is arranged to be fastened in a 20 distance from the bottom of the supply air device (60) for forming a circulation space between the bottom of the supply air device and the nozzle channel structure and wherein primary air is led to the nozzle channel structure and from the nozzle channel structure to a mixing chamber through a plurality of nozzles of the nozzle channel structure 25 as primary air flows and wherein said primary air flows entrains secondary air from outside the supply air device to flow to the mixing chamber of the supply air device and wherein at least a part of said secondary air flows to the mixing chamber through the circulation space, characterized in that the nozzle channel structure is a duct 30 system comprising at least one duct which comprises the plurality of nozzles provided as perforations to the nozzle channel structure and wherein cross-section of at least one duct of the nozzle channel structure is circular or oval.
According to an embodiment, the nozzle channel structure comprises a plurality of nozzles. According to an embodiment, the nozzle channel
20155928 prh 08 -10- 2018 structure comprises a slit nozzle. According to an embodiment, the nozzle channel structure is a peripherally closed duct system. According to an embodiment, the nozzle channel structure comprises at least two separate duct sections. According to an embodiment, the 5 nozzle channel structure is formed from a duct having straight shape.
According to an embodiment, the nozzle channel structure comprises separate ducts. According to an embodiment, the supply air device further comprises a filter. According to an embodiment, locations of the nozzle channel structure or a part of the nozzle channel structure 10 inside a supply air device are adjustable.
Description of the Drawings
In the following, various embodiments of the invention will be described 15 in more detail with reference to the appended drawings, in which
Fig. 1 shows a cross-sectional view of a prior art supply air device;
Fig. 2 shows a perspective image of a supply air device comprising a nozzle channel structure according to an example embodiment;
Fig. 3 shows a perspective image of a supply air device comprising a nozzle channel structure according to an 25 example embodiment;
Fig. 4 shows a primary air flow wall of a supply air device comprising a nozzle channel structure according to an example embodiment;
Fig. 5a-f show nozzle channel structures according to an example embodiment;
Fig. 6 shows a cross-sectional view of a supply air device and an 35 example route of air circulation inside the supply air device according to an example embodiment;
20155928 prh 08 -10- 2018
Fig. 7 shows a simplified cross-sectional view of a part of a supply air device comprising two nozzle channel structures according to an example embodiment.
Fig. 8 shows a simplified supply air device according to an example embodiment; and
Fig.9 shows a simplified supply air device in use according to an example embodiment.
Description of Example Embodiments
The supply air device according to the invention and arranged to be 15 fixed to the ceiling or wall is based on the idea comprises a nozzle channel structure. The term supply air device covers in this context also local exhaust ventilation devices. The nozzle channel structure of the supply air device used for supplying primary air may be provided as a peripherally closed duct system, as separate ducts forming a duct 20 system or as a duct system comprising at least two separate duct sections. The sections may be connected together, for example, by connecting parts or the duct system may comprise at least two separate duct sections in which case a closed duct system is divided to at least two separate duct sections by a compartmentation wall(s). The 25 nozzle channel structure may have various shapes. It may have, for example, a shape of a hollow rectangle with or without round corners, toroid, hollow oval or any other suitable shape when the supply air device is fixed to a ceiling or wall of a room and seen from below. The nozzle channel structure comprises a plurality of nozzles that are 30 perforations with or without collars arranged on the perimeter of the nozzle channel structure in a distance from each other. The number of nozzles, the diameter and shape of nozzles, the locations of nozzles relative to the longitudinal line of one or more parts of the nozzle channel structure and/or the distance between nozzles may be 35 selected to be suitable for the purpose of the supply air device. It is also possible that the location or the diameter or the shape of nozzle
20155928 prh 08 -10- 2018 perforations or the distance between nozzles of the same nozzle channel structure vary. It is also possible that instead of a plurality of nozzles there is one long nozzle, for example, a slit nozzle. The nozzle channel structure may be made, for example, of metal or other suitable 5 material. Ducts or parts of nozzle channel structures may have different cross-sections. A cross-section of duct(s) or part(s) of a nozzle channel structure may be circular, rectangular or a shape of oval etc. Furthermore, cross-sections of ducts/parts of one nozzle channel structure may vary. For example, one or more part(s) of a nozzle 10 channel structure may have rectangular shape and one or more other part(s) of the same nozzle channel structure may have circular shape. The nozzle channel structure may be formed from a uniform channel or channel modules with a monolithic profile, which channel modules are configured to be fastened, for example, one after the other, so that 15 each nozzle channel module constitutes a part of the nozzle channel structure.
Inside the supply air device, the nozzle channel structure is arranged in a distance from a bottom of the supply air device. The bottom of the 20 supply air device is the part of the supply air device that is the upper part of the supply air device when it is fixed to the ceiling or towards the ceiling when it is fixed to the wall. When the nozzle channel structure is arranged in a distance from the bottom of the supply air device, it increases entrainment of the secondary air by enabling circulating of 25 the secondary air from a first side (a center side) of the primary air flow to the other side of the primary air flow through the circulating space between the bottom of the supply air device and the nozzle channel structure, wherein the other side is between the primary air flow and an outer wall of a discharge channel of the supply air device. The air 30 supplied to the conditioned room from air nozzles of the nozzle channel structure of the supply air device is called primary air. The air may be supplied to the conditioned room, for example, from the central ventilation system or from the same room, from some other space/room or from outdoors by using a separate fan. Whereas, 35 secondary air is drawn back into the supply air device to be mixed with primary air. The arrangement according to the invention increases the
20155928 prh 08 -10- 2018 secondary air flow by increasing entrainment of the secondary air, thereby enhancing the purification or temperature controlling of air in the room, if the supply air device is also equipped with a filter and/or a temperature controlling device. The filter causes a flow resistance, 5 which reduces the amount of secondary air flow. If an amount of secondary air decreases, the filtered secondary air flow may not have a significant effect on the quality or temperature of indoor air. By the nozzle channel structure the amount of secondary air may be increased and the quality and/or temperature of indoor air can be kept 10 on an effective level.
Figure 1 shows a cross-sectional view of a prior art supply air device arranged to be installed in a ceiling or wall of a room. Primary air is led via a supply air duct 11 to a supply air chamber 12 of the supply air 15 device 10 from the outside of the device 10, normally from a central ventilation system. From the supply air chamber 12 the primary air is led through air nozzles 13 into a mixing chamber 14 located inside the supply air device 10, at a relatively high rate. The primary air flow blown into the mixing chamber 14 entrains secondary air 16 from the 20 room through a circulation air opening 15 to the supply air device 10 and further to the mixing chamber 14. Primary air flowing from adjacent nozzles 13 forms a primary air flow wall 17 in the mixing chamber 14.
In this kind of supply air device 10, mainly only inner side of air flows of 25 that wall that are towards the circulation air opening 15 entrains the secondary air 16, because the secondary air 16 does not pass through the wall 17 or only a small amount of the secondary air 16 passes through the wall 17 in order to be entrained by the other side of the wall
i.e. the sides of the flows that are towards the outer walls of the supply 30 air device 10. The passing of the secondary air 16 through the primary air flow wall 17 is the more difficult the closer the nozzles. In the mixing chamber 14 primary air and secondary air 16 will be mixed. From the mixing chamber 14, the mixture of primary air and secondary air flows into the room.
20155928 prh 08 -10- 2018
When the entraining is used mainly on only one side of the primary air flow wall, the air circulation effectiveness is not as effective as when more than one side of air flows are used. The term air circulation effectiveness refers to secondary air (l/s) / primary air (l/s).
Figure 2 shows a simplified perspective image of a supply air device 20 comprising a nozzle channel structure 21 according to the example embodiment and arranged to be installed in a ceiling or wall of a room. Primary air may be led via a supply air duct (not shown in the figure 2) 10 to a supply air chamber 22 of the supply air device 20 from the outside of the supply air device 20, normally from a central ventilation system.
From the supply air chamber 22 the primary air may be led to the nozzle channel structure 21 via one or more supply air openings (shown in figure 3). The primary air may be led to the nozzle channel 15 structure 21, for example, via supply air openings that are arranged to at least one corner of the hollow rectangle shaped nozzle channel structure 21. Supply air openings may also be arranged to at least one other part(s) of the nozzle channel structure 21. However, it is also possible that a supply air device does not comprise a supply air 20 chamber, but the primary air is led via a supply air duct directly to the nozzle channel structure.
From the nozzle channel structure 21 the primary air may be led through air nozzles 23 of the nozzle channel structure 21 into a mixing 25 chamber 24 located inside the supply air device 20. The primary air flow blown into the mixing chamber 24 may entrain secondary air from the room through a circulation air opening 25 into the supply air device 20 and further into the mixing chamber 24. Primary air flowing from adjacent nozzles 23 may form a primary air flow wall. Typically in a 30 prior art solution as already mentioned above only inner side of air flows of that wall that are towards the circulation air opening 25 entrains the secondary air, because the secondary air does not pass through the wall or only small amount of the secondary air passes the wall in order to be entrained by the other side of the wall i.e. the sides 35 of the flows that are towards the outer walls of the supply air device 20.
The passing of the secondary air through the primary air flow wall is the
20155928 prh 08 -10- 2018 more difficult the closer the nozzles 23 are. However, the use of the nozzle channel structure 21 which is attached at a distance from the bottom 26 of the supply air device 20 allows secondary air to find its way i.e. to circulate also to the other side of the primary air flow wall 5 through the circulation space between the upper part of the nozzle channel structure 21 and the bottom 26 of the supply air device 20. In the mixing chamber 24 primary air and secondary air will be mixed.
From the mixing chamber 24, the mixture of primary air and secondary air flows to the room.
Figure 3 shows a simplified perspective image of a supply air device 30 comprising a nozzle channel structure 31 according to the example embodiment and arranged to be installed in a ceiling or wall of a room.
The nozzle channel structure 31 is again attached at a distance from 15 the bottom of the supply air device 30. The supply air device 30 comprises also a filter 36. Primary air may be led into the supply air device 30 via a supply air duct 37. Inside the supply air device 30 primary air is led into a supply air chamber 32. From the supply air chamber 32 the primary air is led to the nozzle channel structure 31 comprising a plurality of air nozzles (not shown) via one or more supply air openings 38. From the nozzle channel structure 31 the primary air is led through air nozzles of the nozzle channel structure 31 into a mixing chamber 34 of the supply air device 30. The primary air flow blown into the mixing chamber 34 entrains secondary air from the room through a circulation air opening 35 into the supply air device 30. Inside the supply air device 30 the secondary air flows through the filter 36 on its way to the mixing chamber 34. At least part of the secondary air circulates through the circulation space between the nozzle channel structure 31 and the bottom of the device 30 before it mixes with the primary air in the mixing chamber 34. From the mixing chamber 34, the mixture of primary air and filtered secondary air flows into the room.
However, a supply air device according to an embodiment of the invention may comprise in addition to or instead of a separate filter or 35 filter arrangement. And the secondary air may pass via the filter and/or a temperature controlling device, for example, a heat exchanger when
20155928 prh 08 -10- 2018 flowing into the mixing chamber. The secondary air flow can be led in whole or in part through the filter. Advantageously, the cross-sectional area of the filter covers the whole secondary air flow. It is also possible to arrange the filter to the mixing chamber in such a way that both the 5 primary air and the secondary air are led through the filter before entering to the room. In a corresponding manner, the secondary air flow may be temperature controlled in whole, or only a part of the secondary air flow is passed through the temperature controlling device. Alternatively, the supply air device may be equipped with a 10 heat exchanger bypass plate, wherein the need of temperature controlling can be adjusted according to the load. There may be a water flow inside the temperature controlling device. The need for temperature controlling the air flow may vary, and the adjustment may be made by changing the amount or temperature of the water flow of 15 the temperature controlling device. The supply air device may also be used solely for the purification of air, wherein the device comprises no temperature controlling device. The filter or filter arrangement may be arranged between a circulated air opening and a mixing chamber through which the secondary air flow is led. The filter or filter 20 arrangement may be an electric particle filter, a fabric filter made of electret material, an electric fabric filter, a gas filter or any other suitable filter. If the filter is an electric particle filter, the supply air device further comprises an ionizer arranged to charge airborne impurity particles of the secondary air flow by means of ions produced 25 by corona discharge, placed on the secondary air flow before the filter.
It should be noted that when the entraining is used on both sides of the primary air flow wall as, for example, in the supply air devices 20, 30 of figures 2 and 3, the greater the air circulation effectiveness is. The term 30 air circulation effectiveness refers to secondary air (l/s) / primary air (l/s). The air circulation effectiveness is important, for example, in situations where a certain amount of air should be purified by a supply air device. For example, without the nozzle channel structure, supply air devices may have a circulation effectiveness value of 2 and with the 35 nozzle channel structure a value of 5. The air circulation effectiveness may be more than double when the nozzle channel structure is used.
20155928 prh 08 -10- 2018
Figure 4 shows a primary air flow wall 40 provided by a nozzle channel structure 42 according to the example embodiment. The air flow wall 40 is provided by adjacent nozzles 41 of the nozzle channel structure 5 42 by leading primary air through air nozzles 41 at a relatively high rate.
Figure 5a shows a nozzle channel structure according to an example embodiment. The nozzle channel structure 50 has a shape of a 10 rectangle and it comprises a plurality of nozzles 51 at each side of the rectangle. Locations of nozzles relative to the longitudinal line of one or more parts of the nozzle channel structure 50 can vary. In this embodiment, locations of nozzles relative to the longitudinal line 52 of one side/part of the nozzle channel structure 53 vary. Figure 5b shows 15 a nozzle channel structure according to an example embodiment. This nozzle channel structure 50 has a shape of a rectangle with round corners and it comprises a plurality of nozzles 51. Figure 5c shows a nozzle channel structure according to an example embodiment. This nozzle channel structure 50 has a shape of a toroid and it comprises a 20 plurality of nozzles 51. Figure 5d shows a nozzle channel structure according to an example embodiment. This nozzle channel structure 50 has a shape of an oval and it comprises a plurality of nozzles 51.
Each nozzle channel structure 50 of figures 5a-5d comprises one or more supply air openings. Via one or more supply air openings the 25 primary air is led to the nozzle channel structure 50 from a supply air chamber or directly from a supply air duct.
Figure 5e shows a nozzle channel structure according to an example embodiment. This nozzle channel structure 50 has separate ducts 54, 30 which are not connected to each other. Each duct comprises one or more supply air openings. Via one or more supply air openings the primary air is led to each duct 54 of the nozzle channel structure 50 from a supply air chamber or directly from a supply air duct. Also this nozzle channel structure comprises a plurality of nozzles 51. The ducts 35 54 may have one open end or both ends may be open. The ducts 54 may be connected together by corner pieces so that the sir can flow
20155928 prh 08 -10- 2018 from one duct 54 to at least one other duct 54 or the ducts 54 may be such that they are not connected to each other.
Figure 5f shows a nozzle channel structure according to an example embodiment. This nozzle channel structure 50 is formed from a duct 54 having straight shape. This nozzle channel structure 50 comprises a slit nozzle 51.
It should be noted, that in addition to a shape a cross-section(s) of 10 nozzle channel structure may vary. It may be triangular, circular rectangular, oval or any other suitable shape.
Figure 6 shows a cross-sectional view of a supply air device 60 according to an example embodiment. Figure 6 also shows an example 15 route of air circulation inside the supply air device 60. Primary air 61 is led into the supply air device 60 via a supply air duct (not shown).
Inside the supply air device 60 primary air 61 is led into a supply air chamber 62. From the supply air chamber 62 the primary air 61 is led to a nozzle channel structure 63 comprising a plurality of air nozzles 20 64. From the nozzle channel structure 63 the primary air 61 is led through air nozzles 64 to a mixing chamber 65. The primary air 61 blown into the mixing chamber 65 entrains secondary air 66a, 66b from a room through a circulation air opening 67 into the supply air device
60. The supply air device 60 comprises a filter 68a through which the 25 secondary air 66a, 66b flows when flowing to the mixing chamber 65.
In the mixing chamber 65, second part of the secondary air 66b may circulate also to the other side of flows provided by the nozzles 64 through the circulation space 69 between the bottom of the supply air device 60 and the nozzle channel structure 63. The first part of the 30 secondary air 66a may not circulate through the circulation space 69, but is directly entrained. The possibility to flow also to the other side of air flows provided by the nozzles 64 increases the entrainment and therefore the amount of the secondary air 66a, 66b. From the mixing chamber 65, the mixture of primary air 61 and filtered secondary air 35 66a, 66b flows into the room. Increased amount of secondary air 66a,
66b improves circulation effectiveness which therefore improves
20155928 prh 08 -10- 2018 removal of impurities from room air, if a filter is used, and/or temperature controlling, heating or cooling, of room air, if the supply air device is equipped with a heat exchanger, for example, heating or cooling coil. The part of image 6 comprising the circulation space 69 5 between the bottom of the supply air device 60 is also shown enlarged.
It is also shown a first alternative filter location 68b for the filter 68a that may be arranged to the circulation air opening 67 and a second alternative filter location 68c for the filter 68a that may be arranged to the mixing chamber 65.
Figure 7 shows a simplified cross-sectional view of a part of a supply air device 70 comprising, two, a first and a second nozzle channel structures according to an example embodiment. Nozzle channel structures 71a, 71b are arranged on top of each other and both nozzle 15 channel structures 71a, 71b comprise own mixing chambers 74a, 74b on top of each other so that there is a separating wall 73 between mixing chambers 74a, 74b. Again these nozzle channel structures 71a, 71b may have any shape, for example, a circular rectangular etc. They may even have different shapes. However, one supply air device may 20 comprise more than two nozzle channel structures one on the other.
The first nozzle channel structure 71a is again attached at a distance from the bottom of the supply air device 70 and the second nozzle channel structure 71 b is attached at a distance from the separating wall 25 73 for forming circulation spaces. The supply air device 70 comprises also a filter 76. Primary air may be led into the supply air device 70 via a supply air duct. In the supply air device 70 primary air is led into a supply air chamber 72. From the supply air chamber 72 the primary air is led to the nozzle channel structures 71a, 71b comprising a plurality 30 of air nozzles via one or more supply air openings. From the nozzle channel structure 71a, 71b the primary air is led through air nozzles of the nozzle channel structures 71a, 71b into mixing chambers 74a, 74b of the supply air device 70 as primary air flows 75a, 75b. The primary air flows 75a, 75b blown into the mixing chambers 74a, 74b entrain 35 secondary air 77a, 77b from the room through a circulation air opening into the supply air device 70. Inside the supply air device 70 the
20155928 prh 08 -10- 2018 secondary air 77a, 77b flow through the filter 76 on its way to the mixing chambers 74a, 74b. At least part of the secondary air 74a, 74b circulates through the circulation space between the first nozzle channel structure 71a and the bottom of the device 70 or the other part 5 through the circulation space between the second nozzle channel structure 71b and the separating wall 73 before they mix with the primary air of primary air flows 75a, 75b in the mixing chambers 74a, 74b. From the mixing chambers 74a, 74b, the mixture of primary air and filtered secondary air flows into the room.
This structure comprising a first and a second nozzle channel structures according to the invention increases the secondary air flow even more by increasing entrainment of the secondary air, thereby enhancing the purification or temperature controlling of air in the room.
Figure 8 shows a simplified supply air device according to an example embodiment. Primary air 81 is led into the supply air device via a supply air duct 82. In the supply air device 80 primary air 81 is led to a nozzle channel structure 83 comprising a plurality of air nozzles 84. In this example embodiment the nozzle channel structure is formed as a continuation part of the supply air duct 82 or as a separate part connected to the supply air duct 82. The nozzle channel structure 83 is, in this example embodiment, formed from a duct having straight shape. From the nozzle channel structure 83 the primary air 81 is led through air nozzles 84 to a mixing chamber 85. The primary air blown into the mixing chamber 85 entrains secondary air 86a, 86b from a room through a circulation air opening 88 into the supply air device 80. In the mixing chamber 85, second part of the secondary air 86b may circulate through the circulation space 87 between the wall of the supply air device 80 and the nozzle channel structure 83. The first part of the secondary air 86a may not circulate through the circulation space 87, but is directly entrained. The primary air 81 may be led to the supply air device 80 via the supply air duct 82 by using a fan or a central ventilation system.
20155928 prh 08 -10- 2018
Figure 9 shows a supply air device according to an example embodiment in use. The supply air device 90 is used as a local exhaust ventilation device in this example embodiment. Primary air 91 is led into the supply air device 90. In the supply air device 90 primary air 91 is led to a nozzle channel structure 93 comprising a plurality of air nozzles. From the nozzle channel structure 93 the primary air 91 is led through air nozzles to a mixing chamber 95. The primary air 91 blown into the mixing chamber 95 entrains secondary air 96a, 96b from a room 92 through a circulation air opening 98 into the supply air device 10 90. In the mixing chamber 95, second part of the secondary air 96b may circulate through the circulation space 97 between the bottom 94 of the supply air device 90 and the nozzle channel structure 93. The first part of the secondary air 96a may not circulate through the circulation space 97, but is directly entrained. In this example 15 embodiment the supply air device 90 is used for removing gases or odours 99 locally.
The local exhaust ventilation device or a supply air device according to an example embodiment may be fixed also to a separate support 20 structure instead of a ceiling or a wall.
It should be noted that it is possible that one or more fans are arranged to provide air directly for a nozzle channel structure according to embodiments of the invention without a supply air ducts.
It is also possible to adjust the blowing direction of primary air of a nozzle channel structure by changing the blowing direction of nozzles. A supply air device may further comprise one or more openings on its sides of its casing, so that primary air that is turned to blow towards the 30 outer walls of the supply air device may be blow out through those openings with secondary air that it has entrained. It is also possible to adjust location of a nozzle channel structure or a part of the nozzle channel structure or one of the nozzle channel structures, when comprising more than one nozzle channel structures in relation to the 35 bottom and/or walls of the supply air device. In other words, location of the nozzle channel structure or a part of the nozzle channel structure inside the supply air device is adjustable.
It should be also noted that it is possible to use the air nozzle structure 5 according to the invention also for other gases than air.
It is obvious that the present invention is not limited solely to the abovepresented embodiments, but it can be modified within the scope of the appended claims.

Claims (19)

Patenttivaatimukset:Claims: 1. Tuloilmalaite, joka käsittää:A supply air device comprising: suutinkanavarakenteen (63) ja sekoituskammion (65), joka suutinkana5 varakenne (63) on järjestetty etäisyyden päähän tuloilmalaitteen (60) pohjasta, jolloin tuloilmalaitteen (60) pohjan ja suutinkanavarakenteen (63) väliin muodostuu kiertovirtaustila (69), ja jossa tuloilmalaitteessa primääri-ilmaa (61) johdetaan suutinkanavarakenteeseen (63) ja suutinkanavarakenteesta (63) sekoituskammioon (65) suutinkanavaraken-a nozzle channel structure (63) and a mixing chamber (65), the nozzle channel 5 reserve structure (63) being arranged at a distance from the bottom of the supply air device (60), forming a circulating flow space (69) between the bottom of the supply air device (60) and the nozzle channel structure (63); (61) is led to the nozzle channel structure (63) and from the nozzle channel structure (63) to the mixing chamber (65) 10 teen (63) useiden suuttimien (64) kautta primääri-ilman (61) virtauksina, joiden primääri-ilman (61) virtauksien mukana sekoituskammioon (65) virtaa tuloilmalaitteen (60) ulkopuolelta sekundääri-ilmaa (66a, 66b), josta sekundääri-ilmasta (66a, 66b) ainakin osa virtaa sekoituskammioon (65) kiertovirtaustilan (69) kautta, ja jotka primääri-ilma10 tea (63) through a plurality of nozzles (64) as primary air (61) streams, the primary air (61) flows into the mixing chamber (65) with secondary air (66a, 66b) from outside the supply air device (60), from which the secondary air at least a portion of the air (66a, 66b) flows into the mixing chamber (65) through the circulating flow space (69), and the primary air 15 (61) ja sekundääri-ilma (66a, 66b) on järjestetty sekoittumaan sekoituskammiossa (65) ennen virtaamista ulos tuloilmalaitteesta (60), tunnettu siitä, että suutinkanavarakenne (63) on kanavajärjestelmä, joka käsittää ainakin yhden kanavan, johon on järjestetty useita suuttimia (64) rei'ityksinä suutinkanavarakenteeseen (63), ja jossa suutinkanava-15 (61) and secondary air (66a, 66b) are arranged to mix in the mixing chamber (65) before flowing out of the supply air device (60), characterized in that the nozzle duct structure (63) is a duct system comprising at least one duct provided with several nozzles (64) as perforations in the nozzle channel structure (63), and in which the nozzle 20 rakentessa (63) ainakin yhden kanavan poikkileikkaus on pyöreä tai soikea.In the structure (63) 20, the cross-section of the at least one channel is circular or oval. 2. Patenttivaatimuksen 1 mukainen tuloilmalaite, jossa suutinkanavarakenne (63) käsittää useita suuttimia (64).The supply air device of claim 1, wherein the nozzle duct structure (63) comprises a plurality of nozzles (64). 3. Patenttivaatimuksen 1 mukainen tuloilmalaite, jossa suutinkanavarakenne (63) käsittää rakosuuttimen.The supply air device of claim 1, wherein the nozzle channel structure (63) comprises a slit nozzle. 4. Patenttivaatimuksen 1, 2 tai 3 mukainen tuloilmalaite, jossa primääri-A supply air device according to claim 1, 2 or 3, wherein the primary 30 ilma (61) johdetaan suutinkanavarakenteeseen keskusilmanvaihtojärjestelmästä tai erillisellä tuulettimella.30 air (61) is led to the nozzle duct structure from the central ventilation system or by a separate fan. 5. Jonkin patenttivaatimuksen 1-4 mukainen tuloilmalaite, jossa suutinkanavajärjestelmä (63) on kehämäinen suljettu kanavajärjestelmä.The supply air device according to any one of claims 1 to 4, wherein the nozzle duct system (63) is a circumferential closed duct system. 20155928 prh 25 -04- 201720155928 prh 25 -04- 2017 6. Jonkin patenttivaatimuksen 1-4 mukainen tuloilmalaite, jossa suutinkanavarakenne (63) käsittää ainakin kaksi erillistä kanavaosuutta.The supply air device according to any one of claims 1 to 4, wherein the nozzle duct structure (63) comprises at least two separate duct sections. 7. Jonkin patenttivaatimuksen 1-4 mukainen tuloilmalaite, jossa suutin-A supply air device according to any one of claims 1 to 4, wherein the nozzle 5 kanavarakenne (63) on muodostettu kanavasta, joka on muodoltaan suora.The channel structure (63) is formed of a channel having a straight shape. 8. Jonkin patenttivaatimuksen 1-4 mukainen tuloilmalaite, jossa suutinkanavarakenne (63) käsittää erillisiä kanavia.The supply air device according to any one of claims 1 to 4, wherein the nozzle duct structure (63) comprises separate ducts. 9. Jonkin edellisen patenttivaatimuksen mukainen tuloilmalaite, joka tuloilmalaite (60) käsittää lisäksi suodattimen (68a, 68b, 68c).A supply air device according to any preceding claim, the supply air device (60) further comprising a filter (68a, 68b, 68c). 10. Jonkin edellisen patenttivaatimuksen mukainen tuloilmalaite, joka 15 tuloilmalaite (60) käsittää lisäksi lämpötilansäätölaitteen sekundääri- ilman (66a, 66b) jäähdyttämiseksi tai lämmittämiseksi, joka sekundääriilma (66a, 66b) johdetaan lämpötilansäätölaitteesta sekoituskammioon (65).The supply air device according to any one of the preceding claims, further comprising a temperature control device for cooling or heating the secondary air (66a, 66b), which secondary air (66a, 66b) is led from the temperature control device to the mixing chamber (65). 2020 11. Jonkin edellisen patenttivaatimuksen mukainen tuloilmalaite, joka tuloilmalaite (60) käsittää kaksi tai useampia suutinkanavarakenteita (71a, 71b), joissa on erilliset sekoituskammiot (74a, 74b).Supply air device according to one of the preceding claims, which supply air device (60) comprises two or more nozzle duct structures (71a, 71b) with separate mixing chambers (74a, 74b). 12. Suutinkanavarakenne tuloilmalaitetta varten, joka suutinkanava25 rakenne (63) on järjestetty kiinnitettäväksi etäisyyden päähän tuloilmalaitteen (60) pohjasta kiertovirtaustilan (69) muodostamiseksi tuloilmalaitteen (60) pohjan ja suutinkanavarakenteen (63) väliin, jossa tuloilmalaitteessa primääri-ilmaa (61) johdetaan suutinkanavarakenteeseen (63) ja suutinkanavarakenteesta (63) sekoituskammioon 30 (65) suutinkanavarakenteen (63) useiden suuttimien (64) kautta pri- määri-ilman (61) virtauksina, joiden primääri-ilman (61) virtauksien mukana sekoituskammioon (65) virtaa tuloilmalaitteen (60) ulkopuolelta sekundääri-ilmaa (66a, 66b), josta sekundääri-ilmasta (66a, 66b) ainakin osa virtaa sekoituskammioon (65) kiertovirtaustilan (69) kautta, 35 tunnettu siitä, että suutinkanavarakenne (63) on kanavajärjestelmä, joka käsittää ainakin yhden kanavan, johon on järjestetty useita suutti22A nozzle duct structure for a supply air device, the nozzle duct structure (63) being arranged to be spaced from the bottom of the supply air device (60) to form a circulating flow space (69) between the bottom of the supply air device (60) and the nozzle duct structure (63). 63) and from the nozzle duct structure (63) to the mixing chamber 30 (65) through a plurality of nozzles (64) of the nozzle duct structure (63) as primary air (61) flows with the primary air (61) flows into the mixing chamber (65) externally secondary air (66a, 66b), of which at least part of the secondary air (66a, 66b) flows into the mixing chamber (65) through the circulating flow space (69), characterized in that the nozzle duct structure (63) is a duct system comprising at least one duct, in which several nozzles are arranged22 20155928 prh 25 -04- 2017 mia (64) rei'ityksina suutinkanavarakenteeseen (63), ja jossa suutinkanavarakenteessa (63) ainakin yhden kanavan poikkileikkaus on pyöreä tai soikea.20155928 prh 25 -04- 2017 mia (64) as perforations in the nozzle channel structure (63), and in which the nozzle channel structure (63) has a circular or oval cross section of at least one channel. 55 13. Patenttivaatimuksen 12 mukainen suutinkanavarakenne, joka suutinkanavarakenne (63) käsittää useita suuttimia (64).The nozzle channel structure of claim 12, wherein the nozzle channel structure (63) comprises a plurality of nozzles (64). 14. Patenttivaatimuksen 12 mukainen suutinkanavarakenne, joka suutinkanavarakenne (63) käsittää rakosuuttimen.The nozzle channel structure of claim 12, wherein the nozzle channel structure (63) comprises a slit nozzle. 15. Jonkin patenttivaatimuksen 12-14 mukainen suutinkanavarakenne, joka suutinkanavarakenne (63) on kehämäinen suljettu kanavajärjestelmä.A nozzle channel structure according to any one of claims 12 to 14, wherein the nozzle channel structure (63) is a circumferential closed channel system. 1515 16. Jonkin patenttivaatimuksen 12-14 mukainen suutinkanavarakenne, joka suutinkanavarakenne (63) käsittää ainakin kaksi erillistä kanavaosuutta.A nozzle channel structure according to any one of claims 12 to 14, wherein the nozzle channel structure (63) comprises at least two separate channel portions. 17. Jonkin patenttivaatimuksen 12-14 mukainen suutinkanavarakenne, 20 joka suutinkanavarakenne (63) on muodostettu kanavasta, joka on muodoltaan suora.A nozzle channel structure according to any one of claims 12 to 14, wherein the nozzle channel structure (63) is formed of a channel having a straight shape. 18. Jonkin patenttivaatimuksen 12-14 mukainen suutinkanavarakenne, joka suutinkanavarakenne (63) käsittää erillisiä kanavia.A nozzle channel structure according to any one of claims 12 to 14, wherein the nozzle channel structure (63) comprises separate channels. 19. Jonkin patenttivaatimuksen 12-18 mukainen suutinkanavarakenne, jossa suutinkanavarakenteen (63) tai suutinkanavarakenteesta (63) osan sijoituskohta tuloilmakanavan sisällä (60) on säädettävissä.A nozzle duct structure according to any one of claims 12 to 18, wherein the location of the nozzle duct structure (63) or a part of the nozzle duct structure (63) within the supply air duct (60) is adjustable.
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FI20155928A FI127646B (en) 2015-12-09 2015-12-09 A supply air device
CN201680072089.XA CN108431508B (en) 2015-12-09 2016-12-09 Gas supply device
PCT/FI2016/050862 WO2017098088A1 (en) 2015-12-09 2016-12-09 A supply air device
EP16872476.3A EP3387329B1 (en) 2015-12-09 2016-12-09 A supply air device

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EP3387329A4 (en) 2019-08-07
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EP3387329A1 (en) 2018-10-17
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