JP5080626B2 - Variable air blowing device - Google Patents

Description

  The present invention relates to a variable air volume blowing device.

  One of the air conditioning systems is a variable air volume single duct system. The variable air volume single duct system performs air conditioning by blowing supply air from an air conditioner to an air-conditioned space through a duct and an outlet. In the middle of the duct, a variable air volume device (VAV unit) as in Patent Document 1 is provided. The temperature of the air-conditioned space is individually controlled by increasing / decreasing the air volume of the supplied air for each of the air volume change devices. In such a system, there is a problem that an air flow rate device is required separately from the air outlet, and the equipment cost is increased because the air flow rate device is installed in the ceiling, resulting in poor maintainability. Further, when blowing is stopped, there is a problem that noise is generated due to leakage of wind noise because there is only one mechanism for reducing the air volume.

JP-A-8-28946 Japanese Utility Model Publication No. 7-41345

  In addition, when low-temperature air blowing is performed with a variable flow rate single duct system by using a general draft outlet and lowering the temperature of the supply air below normal to reduce the air volume, the supply air has a low temperature and low air volume. For this reason, there is a problem in that airflow does not diffuse at the outlet and cold draft and condensation occur. In order to prevent this, an air outlet as in Patent Document 2 has been proposed. The air outlet is provided with swirl vanes in order to prevent a decrease in diffusibility, but has a complicated structure, a large pressure loss, and a problem of noise generation. Furthermore, since indoor air is attracted | guided | derived by the indoor opening part which is the lowermost surface of a blower outlet, dew condensation arises inside a blower outlet. Therefore, the heat insulation process of the whole blower outlet is needed. Moreover, since the low-temperature supply air and the attraction air are mixed unevenly, a draft is likely to occur.

In order to solve the above-mentioned problems, the present invention attracts and mixes the air in the air-conditioned space with the supply air sent from the outside, and blows the mixed air to the air-conditioned space, and the supply air and the induced air. An air volume adjusting means for controlling the mixing ratio and the blown air volume of the mixed air, and in the main body, an air outlet for ejecting the supply air is annularly divided into a plurality of parts, and the air outlet is leeward of the air outlet. , The induction port is divided and arranged for each air outlet so as to attract the air in the air-conditioned space by blowing the supply air ejected from the air outlet. There is provided a guide route for guiding the induced air around the entire circumference of the induction port, and the mixed air of the supply air and the induced air is guided and guided to the air-conditioned space leeward of the induction port. Shape mixed air outlet And, the most important feature that the attracting air path for guiding the attracted air from the object conditioned space to the attraction port, the formed.

According to the invention of claim 1 ,
(1) Since the variable air volume device and the air outlet are integrated, construction and maintenance are easy, the equipment cost can be reduced, and the construction of the single variable air volume system is facilitated.
(2) Since the air in the air-conditioned space is attracted and mixed with the supply air, the reheating action works during cooling to prevent cold drafts and condensation, and low-temperature air-conditioning with a variable airflow single duct system can be performed easily . Therefore, equipment costs such as ducts, blower power costs, etc. can be greatly reduced. Further, during heating, the temperature difference between the blown mixed air and the air-conditioned space is reduced, so that comfortable air-conditioning without temperature unevenness can be performed without staying near the ceiling.
(3) It is not necessary to provide a separate device for reheating, simplifying the equipment, and facilitating construction.
(4) Since the mixing ratio of the supply air and the induced air and the blown-out air volume of the mixed air can be controlled, fine air conditioning can be performed according to changes in the air condition of the air-conditioned space.
(5) Since the low-temperature supply air and the hotter induction air are mixed and blown out inside the main body, it is possible to prevent the occurrence of dew condensation in the lee through the air outlet. This eliminates the need for heat insulation between the inlet and the mixed air blowing air passage, reduces the heat insulation treatment range, and facilitates production.
(6) Since the attracting air can be attracted from the entire circumference of the attracting port, there is little pressure loss, and a large air volume (mixing ratio) of the attracting air with respect to the supply air volume can be secured. Therefore, the amount of air blown out from the mixed air can be increased, the diffusibility is improved, and temperature unevenness is eliminated.
(7) Since the air outlet and the inlet are divided in an annular shape (circumferential direction), the static pressure is reduced, the airflow reaching distance is extended, and the diffusibility is improved.
(8) The blowing direction can be freely selected in two directions, three directions, four directions, and the like simply by changing the number of divisions of the air outlet and the inlet according to the layout and space of the air-conditioned space.
(9) Even if the air volume of the supply air is reduced by the air volume adjusting means, the mixing ratio of the supply air and the induced air becomes constant (for example, the air speed of the mixed air blowing air passage increases or decreases even if the air volume of the air outlet increases or decreases) The air volume is adjusted so that the supply air and the induced air are mixed to a specified mixing ratio), so even with a low air volume at a low temperature, the blowing speed and temperature of the mixed air can be stabilized, and cold drafts and condensation can be eliminated reliably. It can exhibit stable diffusion at all times.
(10) Since the air volume adjusting means has a simple structure including only the first and second adjusting members, the actuator, and the screw member, it can be manufactured easily and inexpensively with a small number of parts, and can be provided in the main body to be compact. Space is saved and installation of the variable air volume blowing device becomes easy.
(11) Since air is attracted from the outside in the radial direction of the main body and blown out from the inside in the radial direction of the main body, the ceiling surface is not contaminated by the Coanda effect. Therefore, the ceiling surface is beautiful and maintenance-free.

According to the invention of claim 2 ,
(1) Since supply air swirls along the space | interval part of a main body and spreads over the perimeter, mixed air can be blown out uniformly to a to-be-conditioned space, and a diffusivity does not fall. It can be made compact with a simple structure, does not take up space, has low pressure loss, prevents turbulence, and can smoothly blow out, resulting in low noise.
(2) The partition body can be used both for protection from the temperature effect of the supply air to the actuator and for promoting the diffusion of the supply air by the guidance of the gap portion, so that the number of parts can be reduced and the size can be reduced. Therefore, installation space is not required and installation is easy.

According to the invention of claim 3 ,
(1) With the variable air volume blowing device installed, the air blowing section can be removed from the supply air introducing section, and maintenance of the internal air volume adjusting means and the like can be simplified, improving workability.

  1 to 4 show an embodiment of the variable air volume blowing device of the present invention. This variable air volume blowing device attracts and mixes the air in the air-conditioned space S with the supply air sent from outside. A main body 1 that blows out the mixed air to the air-conditioned space S, and an air volume adjusting means V that controls the mixing ratio of the supply air and the induced air and the air volume of the mixed air are provided. The main body 1 is composed of a supply air introduction portion 8 having a spacing portion 2, and an air outlet portion 9 having an air outlet 4, an induction port 5, a mixed air outlet air passage 6 and an induction air passage 7. The air-conditioned space S is a space such as a room or a hall of various buildings such as office buildings, hospitals, and hotels. A variable air volume blowing device is provided on the ceiling or the like of the air-conditioned space S. Air conditioning air or the like is supplied to the variable air volume blowing device from a not-shown air conditioner via a duct or the like. In addition, the thick arrow of a dotted line in each figure shows a wind direction.

An annular space 2 is formed on the windward side of the main body 1. The air supply port 3 is provided so that the supply air is sent in the circumferential direction of the interval portion 2. In the lee in the axial direction of the interval portion 2, the air outlets 4 that reduce the passage cross-sectional area and increase the wind speed and eject the supply air are divided into a plurality of portions along the interval portion 2 in the circumferential direction. That is, the air jet 4 is divided into a plurality of rings in the main body 1, and the annular spacing portion 2 is formed along the air jet 4 on the windward side of the air jet 4 in the main body 1. In the lee of the air outlet 4, the inlet 5 is divided and arranged for each air outlet 4 so as to attract the air in the air-conditioned space by blowing in the supply air ejected from the air outlet 4. A guide guide path 19 is provided between the attracting port 5 and the circumferential end of the attracting port 5 so as to cause the attracting air to cross the entire circumference of the attracting port 5 in the radial direction. On the lee of the induction port 5, a mixed air blowing air passage 6 that guides and guides the mixed air of the supply air and the induction air to the air-conditioned space S is formed in a circular ring shape that expands from the leeward toward the leeward, An induction air passage 7 for guiding the induction air from the air-conditioned space S to the induction port 5 is formed in an annular shape along the outer periphery of the mixed air blowing air passage 6. In the present invention, the term “annular” includes all shapes such as a ring shape, a cylindrical shape, and a flare shape.

  The blowout portion 9 includes a shade-shaped outer wall body 11, an inner wall body 12 and a short tubular portion 18 that are open on the air-conditioned space S side, and a shade-shaped second adjustment member 21b. The second adjusting member 21b is provided in the inner wall body 12 with a predetermined interval, and the inner wall body 12 and the short cylindrical portion 18 are provided in the outer wall body 11 with a predetermined interval. The induction air passage 7 is formed by the inner surface of the outer wall body 11 and the outer surface of the inner wall body 12, and the mixed air blowing air passage 6 is formed by the inner surface of the inner wall body 12, the short cylindrical portion 18, and the outer surface of the second adjustment member 21b. Form. The windward portion of the mixed air blowing air passage 6 is provided inward in the axial direction of the main body 1 to lengthen the air passage.

  The supply air introduction unit 8 includes a housing 16 that is open on the air-conditioned space S side, a bottomed cylindrical partitioning body 17, and an air supply port 3. The partition 17 is provided in the housing 16 with a predetermined interval. The spacing portion 2 is formed by the inner surface of the housing 16 and the outer surface of the partition body 17. The air supply port 3 is provided in the casing 16 in an inscribed line shape so that the supply air flows spirally in the circumferential direction of the interval portion 2. Although the inner peripheral surface of the supply air introduction part 8 is round, it may be polygonal.

  The air volume adjusting means V adjusts the mixing ratio of the first adjusting member 21a for adjusting the air volume of the supply air blown from the air outlet 4 and the supply air and the induced air blown from the mixed air blowing air passage 6. Drive means D that increases or decreases the air volume (the cross-sectional area of the air outlet 4 and the mixed air blowing air passage 6) by interlocking or individually driving the second adjusting member 21b and the first and second adjusting members 21a and 21b. And. The first adjusting member 21a and the second adjusting member 21b each have a female screw portion at the center.

  The controller 10 that controls the operation of the driving means D has a first sequence for increasing or decreasing the air volume of the air outlet 4 and / or the mixed air blowing air passage 6 according to the air conditioning load (for example, temperature) of the air-conditioned space. doing. Further, the controller 10 adjusts the air volume of the mixed air blowing air passage 6 according to the increase / decrease of the air volume of the air outlet 4 to blow out the supply air and the induced air at a constant mixing ratio, and / or Then, the third adjustment member 21a shifts the air flow rate of the air outlet 4 to a small amount, and the second adjustment member 21b fully closes the mixed air blowing air passage 6 to stop the blowing (FIG. 5). See). In the second sequence, for example, the air volume is adjusted so that the air speed of the mixed air blowing air passage 6 does not increase or decrease even if the air volume of the air outlet 4 increases or decreases, and the supply air and the induced air are set to a predetermined mixing ratio. The controller 10 may be provided separately or integrally with the main body 1.

  The driving means D includes an actuator 22 and a transmission mechanism L that moves the first and second adjusting members 21 a and 21 b by the power of the actuator 22. The transmission mechanism L causes the first and second adjusting members 21a and 21b to be interlocked with each other by the power of the actuator 22 so that the air volume (air flow cross-sectional area) of the air outlet 4 and the mixed air blowing air passage 6 is increased or decreased simultaneously. The screw member 23 is provided. The screw member 23 has a male screw portion that is screwed into the female screw portion of the first adjustment member 21a, and a male screw portion that is screwed into the female screw portion of the second adjustment member 21b. The other male screw portion is formed as a reverse screw with respect to the screw portion. The screw member 23 is rotated by the power of the actuator 22 so that the first adjustment member 21a and the second adjustment member 21b move in opposite directions, and approach and separate from each other. Although not shown, it is possible to provide a mechanism that prevents the screw member 23 and the first and second adjusting members 21a and 21b from rotating together, and the transmission mechanism L includes a gear, a belt, a cam, a link, and the like. Is also free. Alternatively, the actuator 22 may be provided and moved for each of the first and second adjusting members 21a and 21b. The actuator 22 is a motor that moves by electric, hydraulic or pneumatic pressure, but may be a cylinder.

  An actuator 22 is housed inside the partition body 17. Inside the second adjustment member 21b, a lighting device 14 and / or a detector 15 that detects a human body in the air-conditioned space S and outputs a signal is provided. Depending on the signal of the detector 15, one or both of the blown air volume and the lighting fixture dimming are controlled. In the example shown in the figure, the second adjusting member 21b is hollow. However, the second adjusting member 21b is not limited to the example shown in FIG. The air volume adjusting means V is provided inside the main body 1. As shown in FIG. 6, the blowing portion 9 and the supply air introducing portion 8 are configured so that the portions can be appropriately connected and separated, and can be attached and detached using a connector such as a screw. It is configured such that the air volume adjusting means V can be exposed from the opening portion of the supply air introduction portion 8 that is exposed by removing the blowing portion 9.

  The supply air sent into the supply air introduction part 8 diffuses while rotating along the interval part 2, passes through the air outlet 4, and is ejected toward the induction port 5. At that time, the gap between the air outlet 4 and the induction port 5 becomes negative pressure, and the air in the air-conditioned space S is attracted through the induction air passage 7. The attraction air is sucked in from the entire circumference of the entrainment inlet 5 through the guide guide path 19 and mixed with the supply air. Therefore, the ratio of the supply air flow rate to the induced air flow rate with respect to the mixed air blowing flow rate can be increased as 6: 4, for example. The mixed air is blown in four directions toward the air-conditioned space S through the mixed air blowing air passage 6. For example, at the time of cooling, the mixed air blowing air passage 6 mixes the supply air having a low temperature of 13 ° C. and the induced air having a higher temperature of 27 ° C., so that no condensation occurs. The supply air is set to be higher than the dew point temperature of the air-conditioned space S when it is attracted and mixed, but it can be changed freely.

In addition, this invention is not limited to the above-mentioned Example, A design change is freely possible in the range which does not deviate from the summary of this invention. For example, the number of divisions of the air outlet 4 and the induction port 5 can be freely increased and decreased. FIG. 7 shows an example in which the number is divided into three and FIG. FIG. 9 shows that the air outlet 4 is arranged in a part of the circumferential direction along the interval portion 2 (that is, the air outlet 4 is arranged in an annular part in the main body 1, The annular space portion 2 is formed on the windward side of the air outlet 4 ), and the air to be air-conditioned is blown into the induction port 5 from the air outlet 4 toward the leeward side of the air outlet 4. A guide guide path 19 is provided between the both ends in the circumferential direction of the induction port 5 so as to draw the induction air around the entire circumference of the induction port 5. An example is shown. Furthermore, as shown in FIG. 10, the induction air passage 7 and the mixed air blowing air passage 6 may be formed in a polygonal annular shape including a square that expands from the windward toward the leeward. Although not shown, one of the first adjusting member 21a and the second adjusting member 21b may be omitted, and the air volume adjusting means V that controls only the blown air volume of the supply air may be used. Moreover, it is free to omit the partition body 17.

It is the whole figure which looked at the variable amount blowing apparatus from the supply air introduction part side. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is the whole view seen from the blowing part side. It is a principal part longitudinal cross-sectional view explaining operation | movement. It is a longitudinal cross-sectional view which shows the example of decomposition | disassembly. It is sectional drawing which shows the modification of the blowing part which abbreviate | omitted one part. It is sectional drawing which shows the other modification of the blowing part which abbreviate | omitted one part. It is sectional drawing which shows another modification of the blowing part which abbreviate | omitted one part. It is the whole view seen from the blowing part side which shows another modification.

DESCRIPTION OF SYMBOLS 1 Main body 2 Space | interval part 3 Air supply port 4 Air ejection port 5 Induction port 6 Mixed air blowing air path 7 Induction air path 8 Supply air introduction part 9 Blowing part 10 Controller 19 Guidance guide path 21a 1st adjustment member 21b 2nd adjustment Member 22 Actuator 23 Screw member S Air-conditioned space V Air volume adjustment means D Drive means

Claims (3)

In the main body (1) for attracting and mixing the air in the air-conditioned space (S) with the supply air sent from the outside and blowing the mixed air to the air-conditioned space (S) , an air outlet (4), An induction port (5), a mixed air blowing air passage (6), an induction air passage (7), and an air volume adjusting means (V) are provided,
The arc-shaped air outlet (4) for ejecting the supply air is divided into a plurality of annular shapes,
The air in the air-conditioned space (S) is blown down from the air outlet (4) by blowing the supply air ejected from the air outlet (4) through the induction port (5) having an arc shape. It divides and arrange | positions for every said air jet nozzle (4) so that it may be attracted, and the said attraction | suction air is crossed to radial direction between the said circumferential direction edge part of the said attracting opening (5) and the said attracting opening (5). A guide guide path (19) is provided around the entire circumference of the induction port (5),
The mixed air blowing air passage (6) for guiding and guiding the mixed air of the supply air and the induced air to the air-conditioned space (S) is directed from the windward to the leeward. To form an expanding ring,
The induction air passage (7) for guiding the induction air from the air-conditioned space (S) to the induction port (5) is formed in an annular shape along the outer periphery of the mixed air blowing air passage (6),
The air volume adjusting means (V) for controlling the mixing ratio of the supply air and the attraction air and the blown air volume of the mixed air has a female screw part and the supply air blown out from the air outlet (4). A first adjustment member (21a) for adjusting the air volume and a second adjustment for adjusting a mixing ratio of the supply air and the attraction air ejected from the mixed air blowing air passage (6) while having a female screw portion. A member (21b), and driving means (D) for increasing or decreasing the air volume by interlocking the first and second adjusting members (21a) and (21b);
The drive means (D) includes an actuator (22) and a male screw portion that is screwed into the female screw portions of the first and second adjusting members (21a) and (21b), and the actuator (22). Rotating with power, the first and second adjusting members (21a), (21b) are interlocked and screwed back and forth, and each air flow breakage of the air outlet (4) and the mixed air blowing air passage (6) A screw member (23) for simultaneously increasing or decreasing the area,
A controller (10) for controlling the operation of the driving means (D) adjusts the air volume of the mixed air blowing air passage (6) according to the increase or decrease of the air volume of the air outlet (4), and the supply air and A variable air volume blowing device characterized by having a sequence of blowing the induced air at a constant mixing ratio . A partition (17) is provided inside a hollow supply air introduction part (8) constituting a part of the main body (1) to form an annular spacing part (2), and this annular spacing part (2) An air supply port (3) is provided in the supply air introduction part (8) so that supply air is sent in the circumferential direction along the actuator, and the actuator (22) is housed in the partition (17). The variable air volume blowing device described . The supply air introduction part (8) and the blowout part (9) constituting the main body (1) are configured to be freely attachable / detachable, and the supply air introduction part (8) exposed by removing the blowout part (9) is exposed. The variable air volume blowing device according to claim 1 or 2, wherein the air volume adjusting means (V) is configured to face the opening .

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