Air conditioning distribution device

Abstract

To provide an air conditioning distribution device that can sufficiently suppress variation in an air volume distribution ratio.SOLUTION: An air conditioning distribution device 30 includes: a distribution chamber 31 provided with an introduction port 40 of air conditioning air 90 and a plurality of branch ports 41; and a straightening member 50 installed to an interior 36 of the distribution chamber 31. The straightening member 50 has a porous cylindrical shape at a closed annular cross section in which a number of vent holes 52 for transmitting air 90 therethrough.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an air-conditioning distribution device that distributes air-conditioned air from an air conditioner in a building in multiple directions, and particularly to an air-conditioning distribution device having a rectifying mechanism.

Background Art

[0002] Generally, air-conditioning duct devices are provided in buildings such as office buildings (see Patent Documents 1, 2, etc.). The air-conditioning duct device disclosed in Patent Document 1 has an introduction duct extending from an air conditioner, a distribution chamber, and a plurality of branch ducts. The distribution chamber is formed, for example, in a cylindrical shape. On the peripheral wall of the distribution chamber, one inlet and a plurality of branch ports are provided apart from each other in the circumferential direction of the peripheral wall. The tip of the introduction duct is connected to the inlet. Branch ducts extend from each branch port to the corresponding air-conditioning area. The air-conditioned air from the air conditioner passes through the introduction duct, is distributed to the plurality of branch ducts in the distribution chamber, and is supplied to each air-conditioning area.

[0003] Patent Document 2 discloses providing a rectifying plate in the distribution chamber. The rectifying plate is made of a porous plate having a large number of air-permeable holes, and is curved in a semi-cylindrical shape. The rectifying plate is arranged so as to face the plurality of branch ports away from the inlet. The air-conditioned air from the introduction duct flows from the inlet toward the front and is diffused in the circumferential direction along the concave surface of the semi-cylinder of the rectifying plate, and is guided to each branch port through each air-permeable hole. Thereby, the variation in the air volume distribution ratio between the plurality of branch ducts is suppressed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] According to the inventor's findings, in the rectifying structure of Patent Document 2, the effect of suppressing variations in the air volume distribution ratio may not be sufficiently enhanced depending on the situation such as the flow velocity distribution of the introduced air flow. In view of such circumstances, an object of the present invention is to provide an air conditioning distribution device capable of sufficiently suppressing variations in the air volume distribution ratio.

Means for Solving the Problems

[0006] To solve the above problems, an air conditioning distribution device according to the present invention includes a distribution chamber provided with an inlet for air conditioning air and a plurality of branch ports, a rectifying member provided inside the distribution chamber, and is characterized in that the rectifying member is a porous cylindrical shape with a closed annular cross-section in which a large number of air-permeable holes are formed.

[0007] Preferably, the air-permeable holes are provided over the entire circumferential direction of the rectifying member.

[0008] Preferably, the rectifying member is a porous cylindrical shape.

[0009] Preferably, the distribution chamber and the rectifying member form a concentric double cylindrical shape.

Effects of the Invention

[0010] According to the present invention, variations in the air volume distribution ratio in the air conditioning distribution device can be sufficiently suppressed.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figure 1 shows an air conditioning duct device 1 installed in a building such as an office building or a residence. The air conditioning duct device 1 includes ducts 10, 11, an opening degree adjustment damper 20, and a conditioned air distribution device 30. An introduction duct 10 extends from an air conditioner (not shown) and is connected to the conditioned air distribution device 30. A plurality (here, four) of branch ducts 11 extend from the conditioned air distribution device 30 to corresponding conditioned air target areas (not shown) in the building, respectively.

[0013] As shown in Figure 1, an opening degree adjustment damper 20 is interposed between the introduction duct 10 and the conditioned air distribution device 30 as an air volume adjustment mechanism. The opening degree adjustment damper 20 includes, for example, circular rotating blades 21 and a rotating shaft 22 disposed on the diameter of the rotating blades 21. The rotating shaft 22 is oriented horizontally. The rotating blades 21 are angle-adjustable about the rotating shaft 22. The opening degree of the introduction duct 10 is adjusted according to the rotation angle of the rotating blades 21, thereby adjusting the air volume of the conditioned air.

[0014] As shown in Figures 1 and 2, the conditioned air distribution device 30 includes a distribution chamber 31, an inlet 40, a plurality (here, four) of branch ports 41, and a rectifying member 50. The distribution chamber 31 is formed in a cylindrical container shape with a lid and a bottom.

[0015] As shown in Fig. 3, on the inner peripheral surface of the peripheral wall 32 of the distribution chamber 31, the lower surface of the lid plate portion 33, and the upper surface of the bottom plate portion 34, a heat insulation layer 35 with a certain thickness is provided. The heat insulation layer 35 is composed of a heat insulating material such as foamed urethane or glass wool. The heat insulation layer 35 defines the inner chamber 36 (inside the distribution chamber 30).

[0016] As shown in Fig. 1, on the peripheral wall 32 of the distribution chamber 31, an inlet 40 and a plurality of branch ports 41 are provided. The inlet 40 is composed of a short pipe. The inlet 40 penetrates through the heat insulation layer 35 and the peripheral wall 32 and protrudes radially outward of the branch chamber 31. The outlet portion of the opening degree adjusting damper 20 is connected to the inlet 40.

[0017] As shown in Figs. 1 and 2, on the peripheral wall 32 of the distribution chamber 31, in an approximately half - circumferential portion (the lower half in Fig. 1) on the side opposite to the inlet 40, a plurality of branch ports 41 are provided. The plurality of branch ports 41 are arranged at intervals in the circumferential direction of the peripheral wall 32. Further, the plurality of branch ports 41 may also be distributed in the axial direction (up and down in Fig. 2) of the peripheral wall 32. The number of branch ports 41 is four in the figure, but it is not limited to this, and may be two or three, or five or more.

[0018] As shown in Fig. 3, the branch port 41 is composed of a short pipe with a smaller diameter than the inlet 40. Each branch port 41 penetrates through the heat insulation layer 35 and the peripheral wall 32 and protrudes radially outward of the branch chamber 31. As shown in Fig. 1, a corresponding branch duct 11 is connected to each branch port 41.

[0019] As shown in Figs. 1 and 3, in the inner chamber 36 of the chamber, a rectifying member 50 is provided. The rectifying member 50 is formed in a cylindrical shape with a closed - loop cross - section, and preferably in a cylindrical shape. A large number of ventilation holes 52 for allowing air to pass through are formed in the rectifying member 50. Therefore, the rectifying member 50 is a porous cylindrical shape, and preferably a porous cylindrical shape. The rectifying member 50 may be formed by shaping a porous plate such as a net or perforated metal into a closed - loop shape.

[0020] As shown in FIG. 3, the ventilation holes 52 are uniformly distributed over the entire circumferential direction and substantially the entire axial direction of the flow rectifying member 50. Note that ventilation holes 52 are not formed at the central portion and both end portions in the axial direction of the flow rectifying member 50. The portion of the flow rectifying member 50 excluding these central portion and both end portions serves as the ventilation hole arrangement region 51. Ventilation holes 52 may also be formed at the central portion in the axial direction of the flow rectifying member 50, or only the end portions in the axial direction of the flow rectifying member 50 may be portions without ventilation holes. Ventilation holes 52 may also be formed at the end portions in the axial direction of the flow rectifying member 50, or only the central portion in the axial direction of the flow rectifying member 50 may be a portion without ventilation holes. A part in the axial direction of the flow rectifying member 50 (regardless of whether it is the central portion or the end portion) may be a portion without ventilation holes. The entire area of the flow rectifying member 50 may be the ventilation hole arrangement region 51.

[0021] The aperture ratio (total area of a plurality of ventilation holes 52 ÷ area of the ventilation hole arrangement region 51) in the ventilation hole arrangement region 51 is preferably about 50% to 99%. The diameter φ of each ventilation hole 52 52 is preferably φ 52 = about 2 mm to 20 mm. The pitch P of the ventilation holes 52 52 (center - to - center distance between two adjacent ventilation holes 52) is preferably about 0.5 times to 2 times the diameter of each ventilation hole 52 (0.5 × φ 52 ≤ P 52 ≤ 2 × φ 52 ).

[0022] The axis of the flow rectifying member 50 is oriented in the vertical direction. Therefore, the axis of the flow rectifying member 50 and the rotation axis 22 of the opening degree adjusting damper 20 are orthogonal to each other. The upper end portion of the flow rectifying member 50 is in contact with the heat insulating layer 35 of the cover plate portion 33. The lower end portion of the flow rectifying member 50 is in contact with the heat insulating layer 35 of the bottom plate portion 34. The flow rectifying member 50 is supported by the distribution chamber 31 via a support member (not shown).

[0023] As shown in FIG. 1, the rectifying member 50 is disposed at the center of the inner chamber 36 of the chamber. The axis of the rectifying member 50 coincides with the axis of the distribution chamber 31. Therefore, the distribution chamber 31 and the rectifying member 50 form a concentric double-cylindrical shape. Preferably, the outer diameter D of the rectifying member 50 50 (FIG. 3) is about 0.2 to 0.9 times the inner diameter D of the inner chamber 36 of the chamber 36 (0.2×D 36 ≦D 50 ≦0.9×D 36 ), and more preferably about 0.5 to 0.8 times (0.5×D 36 ≦D 50 ≦0.8×D 36 ). Preferably, the outer diameter D of the rectifying member 50 50 is larger than the inner diameter of each branch port 41. In the figure, the outer diameter D of the rectifying member 50 50 is smaller than the inner diameter of the inlet port 40, but the outer diameter D of the rectifying member 50 50 may be larger than the inner diameter of the inlet port 40. The wall thickness of the rectifying member 50 is preferably 0.1 mm to several mm, more preferably 0.1 mm or more and 1 mm or less.

[0024] By the rectifying member 50, the inner chamber 36 of the chamber is partitioned into an annular chamber 37 outside the rectifying member 50 and a cylindrical inner chamber 57 inside the rectifying member 50. The annular chamber 37 is defined by the inner peripheral surface of the heat insulating layer 35 and the outer peripheral surface of the rectifying member 50. The annular chamber 37 and the cylindrical inner chamber 57 are communicated with each other through the vent hole 52.

[0025] In the air conditioning duct device 1, air-conditioned air from an air conditioner (not shown) passes through the introduction duct 10, is adjusted in air volume by the opening degree adjusting damper 20, and then is introduced into the distribution chamber 30 from the inlet port 40. At this time, depending on the opening degree (angle of the rotary blade 21) of the opening degree adjusting damper 20, etc., the flow velocity distribution of the air-conditioned air may become non-uniform. For this reason, as shown in FIG. 4, the air flow 90 at the inlet port 40 may locally include a high-speed flow component 90h.

[0026] As shown in FIG. 4, the air flow 90 enters the annular chamber 37 from the inlet 40 and impinges on the introduction-side circumferential-side portion 53 of the rectifying member 50 facing the inlet 40, where it is dispersed. As a result, at least a part of the high-speed flow component 90h is decelerated. Furthermore, the introduced air flow 90 is divided into an air flow 91 that diffuses within the annular chamber 37 and a permeated air flow 92.

[0027] Furthermore, the annular chamber air flow 91 is divided into flows 91a that flow from the inlet 40 to both circumferential sides of the annular chamber 37. Each divided flow 91a flows along the outer circumference of the rectifying member 50 and turns into the semi-circular chamber portion 37b on the outlet side of the annular chamber 37, which is opposite to the inlet 40. As shown by the phantom line in FIG. 4, if the annular chamber air flow 91 contains a high-speed flow component 91h, the high-speed flow component 91h is decelerated in the process of flowing into the outlet-side semi-circular chamber portion 37b.

[0028] The permeated air flow 92 passes through the ventilation holes 52 of the introduction-side circumferential-side portion 53, flows into the inner cylinder chamber 57, and diffuses. In particular, the air flow component 92h that maintains a high speed among the permeated air flow 92 flows straight through the inner cylinder chamber 57 toward the outlet side (the side opposite to the inlet 40) and impinges on the inner circumferential surface of the outlet-side circumferential-side portion 54 of the rectifying member 50. As a result, the air flow component 92h is decelerated.

[0029] The permeated air flow 92 containing the decelerated air flow component 92h diffuses within the inner cylinder chamber 37, passes through the ventilation holes 52 of the outlet-side circumferential-side portion 54, and flows into the outlet-side semi-circular chamber portion 37b. As a result, in the outlet-side semi-circular chamber portion 37b, the annular chamber air flow 91 and the permeated air flow 92 merge to form a distribution flow 93 to each branch port 41.

[0030] As a result, the conditioned air can be distributed to the plurality of branch ports 41 substantially evenly. In particular, even if a part of the air flow component 90h is locally accelerated, it can be effectively decelerated and rectified by the porous cylindrical rectifying member 50. Therefore, the variation in the air volume distribution ratio to the branch ports 41 can be made sufficiently small. The distributed flows 93 to the respective branch ports 41 are supplied to the respective target areas to be air-conditioned (not shown) by the branch ducts 11.

[0031] The present invention is not limited to the above-described embodiment, and the present invention can be modified without departing from the spirit and scope of the present invention. Various modifications can be made. For example, the axis of the flow straightening member 50 may be eccentric with respect to the axis of the distribution chamber 30. The flow straightening member 50 may be eccentric toward the inlet 40 side. The flow straightening member 50 may be eccentric toward the side facing the outlet 40 (outlet side). The shape of the distribution chamber 30 is not limited to a cylindrical shape, but may be a square or other angular cylindrical shape. The flow straightening member 50 is not limited to a porous cylindrical shape, but may be a porous square tube or other porous polygonal tube. [Industrial Applicability]

[0032] The present invention can be applied to air conditioning systems in, for example, office buildings, residences, factories, and the like. [Explanation of symbols]

[0033] 1. Air conditioning duct equipment 10 Inlet Duct 11 Branch duct 20 Opening adjustment damper 21 Rotor 30 Air conditioning distribution equipment 31 Distribution chamber 32 Peripheral wall 35 Insulation Layer 36 Inner chamber (inside of distribution chamber) 37 Circular Chamber 37b Output side semicircular chamber 40 Introduction 41 Branch Exit 50 Straightening member 51 Vent placement area 52 Ventilation hole 53 Introduction side periphery 54 Lead-out side periphery 57 Cylinder chamber 90 Air conditioning air flow 90h high-speed air flow component 91 annular chamber air flow 92 permeated air flow 93 distribution

Claims

**Claim 1** A distribution chamber provided with an inlet for conditioned air and a plurality of branch ports, A rectifying member provided inside the distribution chamber, The air-conditioning distribution device is characterized in that the rectifying member is a porous cylindrical shape with a closed annular cross-section formed with a large number of ventilation holes for allowing air to pass through. **Claim 2** The air-conditioning distribution device according to claim 1, wherein the ventilation holes are provided over the entire circumferential direction of the rectifying member. **Claim 3** The air-conditioning distribution device according to claim 1, wherein the rectifying member is a porous cylindrical shape. **Claim 4** The air-conditioning distribution device according to claim 3, wherein the distribution chamber and the rectifying member form a concentric double-cylindrical shape.

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