JP5028511B2 - 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.

JP-A-8-28946

  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. In addition, when low-temperature air blowing is performed with a variable air flow rate single duct system by lowering the temperature of the supply air than usual and reducing the air volume, the air flow does not diffuse at the outlet due to the low temperature and low air volume. There is a problem of cold draft and condensation.

  In order to solve the above-mentioned problem, the present invention is a variable air volume blowing device that draws and mixes air in an air-conditioned space with supplied air sent from the outside and blows it out to the air-conditioned space, wherein the supplied air and the attracted air The main feature is that it comprises a main body through which air flows, and an air volume adjusting means for controlling the mixing ratio of the supply air and the attraction air and the blown air volume of the mixed air.

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) Even if the air volume of the supply air is reduced, the mixing ratio of the supply air and the induced air becomes constant, so that the blowing speed and temperature of the mixed air are stable even at a low temperature and low air volume, and cold draft and condensation are reliably eliminated. And can always exhibit stable diffusivity.
(6) When stopping the blowing of the mixed air, the first adjustment member reduces the ventilation cross-sectional area of the first ventilation path and reduces the pressure, and the second adjustment member fully closes the second ventilation path. Occurrence can be prevented.
(7) Since it is a simple structure, it can be made compact and does not take up space and is easy to install.
(8) Since it is a simple structure consisting only of an actuator and a screw member, the number of parts is small and the manufacturing is easy, the size can be reduced, and the manufacturing can be made at a low cost.

According to the invention of claim 2 ,
(1) Since air is attracted from the outside of the main body in the radial direction, the supply air and the induced air are mixed at the upwind inlet of the mixed air blowing air passage at the back of the main body, and blown out from the inside in the radial direction of the main body. Condensation prevention effect is large, and dirt on the ceiling surface due to the Coanda effect does not occur. Moreover, the mixed air without temperature unevenness can be blown into the air-conditioned space, and comfort is improved.
(2) Since the supply air ejection passage is annular, it is possible to increase the amount of air as compared with the case of the nozzle shape, and to secure a large amount of induced air with respect to the supply air (mixing ratio) with low pressure loss. Therefore, the amount of air blown out from the mixed air can be increased, the diffusibility is improved, and temperature unevenness is eliminated.

According to the invention of claim 3 ,
(1) Since supply air is spirally blown along the inner surface of the supply air introduction section and spreads over the entire circumference, the mixed air can be blown evenly into the air-conditioned space, improving diffusibility with a simple structure To do.

According to the invention of claim 4 ,
(1) The housing can be used to protect against the temperature effect of the supply air of the actuator and to promote 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 5 ,
(1) With the variable air volume blowing device installed, the tip air blowing section can be removed from the supply air introducing section, and the maintenance of the internal air volume adjusting means and the like can be simplified, improving workability.

  1 to 3 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 supplied air sent from the outside. The air-conditioning space S is blown into the air-conditioning space S, and includes a main body 1 through which supply air and attraction air flow, and an air volume adjusting means V for controlling the mixing ratio of supply air and attraction air and the air volume of the mixture air. Yes. 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.

  Inside the main body 1, there are a first ventilation path 2 a through which supply air flows and a second ventilation path 2 b for supplying supply air for attracting air in the air-conditioned space S. The 2nd ventilation path 2b is provided in the lee of the 1st ventilation path 2a. The air volume adjusting means V adjusts the mixing ratio of the first adjusting member 3a for adjusting the air volume of the supply air blown from the first ventilation path 2a and the supply air and the attraction air ejected from the second ventilation path 2b. Two adjusting members 3b and driving means D for increasing or decreasing the ventilation cross-sectional area of the first and second ventilation paths 2a, 2b by interlocking or individually driving the first and second adjustment members 3a, 3b. I have. The first adjustment member 3a and the second adjustment member 3b each have a female screw portion at the center. The first ventilation path 2a is configured by the supply air circulation inner peripheral surface 17 of the main body 1 and the first adjustment member 3a. The 2nd ventilation path 2b is comprised with the short cylindrical part 18 for supply air circulation of the main body 1, and the 2nd adjustment member 3b. As described above, the first and second adjusting members 3a and 3b share the ventilation path constituting member and the ventilation path opening / closing member, so that the number of parts and the cost can be reduced. In addition, the structure of the 1st and 2nd adjustment members 3a and 3b and the 1st and 2nd ventilation path 2a and 2b and the change of a structure are free, and are not limited to the example of a figure. For example, you may comprise so that the 1st ventilation path 2a and the 1st adjustment member 3a may become the leeward of the 2nd ventilation path 2b and the 2nd adjustment member 3b.

The controller 4 that controls the operation of the drive means D has a first sequence for increasing or decreasing the air volume of the first ventilation path 2a and / or the second ventilation path 2b according to the air conditioning load (for example, temperature) of the air-conditioned space. is doing. Further, the controller 4 adjusts the air volume of the second ventilation path 2b according to the increase / decrease of the air volume of the first ventilation path 2a to blow out the supply air and the induced air at a constant mixing ratio, or / and In the third sequence (see FIG. 4), the first air passage 2a is shifted to a slightly opened state by the first adjusting member 3a, and the second air passage 2b is fully closed by the second adjusting member 3b to stop the blowing. ), a has. In the second sequence, for example, the air volume is adjusted so that the air speed of the second ventilation path 2b does not increase or decrease even if the air volume of the first ventilation path 2a increases or decreases, and the supply air and the induced air are set to a predetermined mixing ratio. The controller 4 may be provided separately or integrally with the main body 1.

Driving means D includes an actuator 5 comprises first by the power of the actuator 5 and the second adjustment member 3a, and the transmission mechanism L for moving the 3b, and. The transmission mechanism L is a screw member that simultaneously increases or decreases the ventilation cross-sectional areas of the first and second ventilation paths 2a and 2b by screwing the first and second adjustment members 3a and 3b together with the power of the actuator 5 while interlocking. 6. The screw member 6 includes a male screw portion that is screwed into the female screw portion of the first adjustment member 3a, and a male screw portion that is screwed into the female screw portion of the second adjustment member 3b. The other male screw portion is formed as a reverse screw with respect to the screw portion. The screw member 6 is rotated by the power of the actuator 5 so that the first adjustment member 3a and the second adjustment member 3b 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 6 and the first and second adjusting members 3a and 3b 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 5 may be provided and moved for each of the first and second adjusting members 3a and 3b. The actuator 5 is a motor that moves by electric, hydraulic or pneumatic pressure, but may be a cylinder.

The main body 1 communicates with the air-conditioned space S, the mixed air blowing air passage 9 that guides and guides the mixed air of the supply air and the induced air to the air-conditioned space S, and the air-conditioned space S communicates with the air-conditioned space S. To the mixed air blowing air passage 9 and the second ventilation for communicating with the first air passage 2a and blowing the supply air to the mixed air blowing air passage 9 to attract air from the induction air passage 8. And a path 2b. The mixed air blowing air passage 9 is formed in a circular or polygonal annular shape that expands from the windward side toward the leeward side. An induction air passage 8 is formed in an annular shape along the outer periphery of the mixed air blowing air passage 9, and the induction air passage 8 is communicated at the windward inlet of the mixed air blowing air passage 9. The second ventilation path 2 b is formed in an annular shape along the upwind inlet of the mixed air blowing path 9. The mixed air blowing air passage 9 and the induction air passage 8 are provided leeward of the first air passage 2a. The upwind inlet portion of the mixed air blowing air passage 9 is provided inward in the axial direction of the main body 1 to lengthen the air passage. The main body 1 includes a tip blowing portion 7 and a supply air introducing portion 11. The outer peripheral wall 19 and the inner peripheral wall 20 of the tip blowing portion 7 constitute an induction air passage 8. The mixed air blowing air passage 9 is constituted by the inner peripheral wall 20 and the second adjusting member 3b. The configuration and structure of the mixed air blowing air passage 9 and the induction air passage 8 can be changed freely and are not limited to the illustrated examples. In the present invention, the term “annular” includes all shapes such as a ring shape, a cylindrical shape, and a flare shape.

  The inner surface 10 of the hollow supply air introduction portion 11 is formed in an annular shape, and the air supply port 16 is shifted from the central portion of the supply air introduction portion 11 so that the supply air is sent in the circumferential direction along the annular inner surface 10. Provide. A casing 12 is provided inside the supply air introduction portion 11 to form an annular spacing portion 13. An air supply port 16 is provided so that supply air is sent in the circumferential direction along the annular interval portion 13. The actuator 5 is housed inside the housing 12. In the example shown in the drawing, the inner peripheral surface of the supply air introduction unit 11 is round, but may be polygonal. Further, the housing 12 may be omitted.

  The air volume adjusting means V is provided inside the main body 1. As shown in FIG. 5, the tip blowing portion 7 and the supply air introducing portion 11 are configured so that they can be connected and separated as appropriate, 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 introducing portion 11 that is exposed by removing the tip blowing portion 7. The second adjustment member 3b is formed in a hollow shape or a shade shape with an open lee, and a detector 15 for detecting a human body in the lighting fixture 14 and / or the air-conditioned space S and outputting a signal is provided therein. It is also free to configure to control one or both of the blown air volume and the lighting fixture dimming according to the signal of the detector 15.

  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, as shown in FIG. 6, the induction air passage 8 and the mixed air blowing air passage 9 may be formed in a polygonal annular shape including a square that expands from the upwind toward the downwind. Although not shown, the air volume adjusting means V that controls only the blown air volume of the supplied air by omitting one of the first ventilation path 2a and the first adjustment member 3a and the second ventilation path 2b and the second adjustment member 3b. good.

It is a longitudinal cross-sectional view of a variable volume blowing apparatus. It is the whole view seen from the supply air introduction part side. It is the whole view seen from the tip 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 the whole view seen from the tip blowing part side which shows a modification.

DESCRIPTION OF SYMBOLS 1 Main body 2a 1st ventilation path 2b 2nd ventilation path 3a 1st adjustment member 3b 2nd adjustment member 4 Controller 5 Actuator 6 Screw member 7 End blowing part 8 Induction air path 9 Mixed air blowing path 10 Inner surface 11 Supply air introduction Part 12 Case 13 Gap part 16 Air supply port S Air-conditioned space V Air volume adjusting means D Driving means

Claims (5)

A variable air volume blowing device that induces and mixes air in an air-conditioned space (S) with supplied air sent from the outside and blows it out to the air-conditioned space (S), wherein the supply air and the induced air flow through the main body ( 1), and an air volume adjusting means (V) for controlling a mixing ratio of the supply air and the attraction air and a blowing air volume of the mixed air ,
A first ventilation path (2a) through which the supply air flows inside the main body (1) and a second ventilation path (2b) for supplying supply air for attracting air in the air-conditioned space (S). And having
The air volume adjusting means (V) jets from the first ventilation member (3b) for adjusting the air volume of the supply air blown from the first ventilation path (2a) and the second ventilation path (2b). A second adjustment member (3b) for adjusting the mixing ratio of the supply air and the attraction air, and the first and second adjustment members (3a) and (3b) are linked or individually driven to Drive means (D) for increasing or decreasing the ventilation cross-sectional area of the second ventilation path (2a), (2b),
The controller (4) for controlling the operation of the driving means (D) adjusts the air volume of the second ventilation path (2b) according to the increase / decrease of the air volume of the first ventilation path (2a), and Sequence for blowing out the induced air at a constant mixing ratio, and / or the second adjustment member by shifting the first ventilation path (2a) to a slightly opened state by the first adjustment member (3a) (3b) has a sequence in which the second ventilation path (2b) is fully closed to stop blowing,
The driving means (D) is screwed back and forth while interlocking the first and second adjusting members (3a) and (3b) by the actuator (5) and the power of the actuator (5). And a screw member (6) for simultaneously increasing or decreasing the ventilation cross-sectional area of the two ventilation paths (2a) and (2b) . The main body (1) has a mixed air blowing air passage (9) for guiding and guiding the mixed air of the supply air and the induced air to the air-conditioned space (S), and the mixed air is blown from the air-conditioned space (S). An induction air passage (8) for guiding and guiding the air to the air passage (9), and a second air passage for injecting the supplied air into the mixed air blowing air passage (9) to attract air from the induction air passage (8) (2b), and the mixed air blowing air passage (9) is formed into a round or polygonal ring that expands from the windward toward the leeward, and the outer periphery of the mixed air blowing air passage (9). The induction air passage (8) is formed in an annular shape along the air flow path, and the induction air passage (8) is communicated with the upwind inlet of the mixed air blowing air passage (9), so that the mixed air blowing air passage (9 The variable air volume blowing device according to claim 1, wherein the second ventilation path (2 b) is formed in an annular shape along the windward inlet portion . An inner surface (10) of a hollow supply air introduction part (11) constituting a part of the main body (1) is formed in an annular shape, and supply air is sent in the circumferential direction along the annular inner surface (10). The variable air volume blowing device according to claim 1 or 2, wherein an air supply port (16) is provided in the supply air introduction section (11) . A casing (12) is provided inside a hollow supply air introduction part (11) constituting a part of the main body (1) to form an annular spacing part (13), and this annular spacing part (13) An air supply port (16) is provided in the supply air introduction part (11) so that supply air is sent in the circumferential direction along the air flow, and a part of the air volume adjusting means (V) is provided inside the housing (12). The variable air volume blowing device according to claim 1, 2 or 3, wherein an actuator (5) to be configured is housed . An air volume adjusting means (V) is provided inside the main body (1), and a tip blowout portion (7) and a supply air introduction portion (11) constituting the main body (1) are configured to be freely attachable / detachable, The variable air volume blowing device according to claim 1, 2, 3 or 4, wherein the air volume adjusting means (V) is configured to face the opening of the supply air introducing section (11) which is exposed by removing the blowing section (7). .

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