Branching Chamber

Abstract

The present invention provides a branch chamber that does not require extra space above or below and that can equalize the flow rate from the outlet despite the small pressure loss. [Solution] Inside the chamber body of the branching chamber of the present invention, if a plane parallel to the inner surface of the tip wall portion 24 is defined as an orthogonal plane, a flow rate equalizing means 40 for equalizing the flow rate of air in the orthogonal plane is disposed in front of the outlet formed at a position closest to the inlet 30, and a guide means 50 is disposed between the multiple outlets 32A etc. for changing the direction of travel of the air when it comes into contact with it and guiding it to the outlet.

Description

[Technical field]

[0001] The present invention relates to a branch chamber for air conditioning. [Background technology]

[0002] In a central air conditioning system, a system is generally adopted in which a main duct extends from an air conditioner installed in a building, and conditioned air is supplied to each air-conditioned area such as a room through a branch duct connected to the main duct. A branch chamber is provided between the main duct and a plurality of branch ducts. This type of branch chamber is typically configured in a hollow box shape of a rectangular parallelepiped. In the branch chamber configured in this way, an inlet for conditioned air is formed at one end in the length direction, and a plurality of outlets are formed at the other end, and the outlet closer to the inlet has a smaller flow rate, and the outlet farther from the inlet has a larger flow rate. The difference in the flow rate of air flowing out from the outlet is maintained in the branch duct, and is adjusted by an air outlet directly connected to each air-conditioned area such as a room, so that the flow rate is uniformed. However, the adjustment work at the air outlet takes a lot of time, and since there are differences in the characteristics of the variable air volume control device (VAV: Variable Air Volume) installed in front of each air conditioner and the branch chamber, such adjustment work takes even more time. In this regard, it is ideal if the flow rates from the outlets of the branch chambers are uniform, as this reduces the time required for adjustment work at the air intake.

[0003] In response to this, a technology has been proposed in which the branch chamber is configured as a flat box shape with height smaller than width, an inlet is formed in one wall in the height direction (thickness direction) (e.g., the wall constituting the bottom surface), and the air flowing in from the inlet is collided with the other wall in the height direction (e.g., the wall constituting the ceiling surface), thereby rectifying the air (e.g., Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-183940 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the technology of Patent Document 1, since the inlet needs to be formed on one wall in the height direction, the main duct needs to be connected to the branch chamber from above or below. Therefore, a space for piping is required above or below the ceiling or other place where the branch chamber is located. In addition, in the technology of Patent Document 1, the air that flows into the branch chamber hits the wall in the height direction and changes its direction before reaching the outlet, and then hits the wall at the back in the length direction, which is perpendicular to the height direction, and the air changes its direction again, resulting in a problem of large pressure loss.

[0006] In consideration of the above, the present invention provides a branch chamber that does not require extra space above or below and that can equalize the flow rate from the outlet despite small pressure loss. [Means for solving the problem]

[0007] A first invention is a branching chamber having a chamber main body in the shape of a hollow box that is long in one direction, the chamber main body having a tip wall portion, a rear wall portion, a first side wall portion, a second side wall portion, a bottom wall portion and a ceiling wall portion, the first side wall portion and the second side wall portion are arranged in opposing positions, the bottom wall portion and the ceiling wall portion are arranged in opposing positions, a peripheral wall portion is formed by the first side wall portion, the second side wall portion, the bottom wall portion and the ceiling wall portion, the tip wall portion is arranged to close a tip portion of the peripheral wall portion, the rear wall portion is arranged to close a rear end portion of the peripheral wall portion, an inlet port for allowing air to flow into the chamber main body is connected to the tip wall portion, and the first side wall portion and the second side wall portion each have a channel portion. This is a branch chamber in which a plurality of air outlets for allowing air to flow out from a chamber body are connected to different positions in the longitudinal direction, and inside the chamber body, the tip wall side is defined as the front, the rear wall side is defined as the rear, and a plane parallel to the inner surface of the tip wall portion and the inner surface of the rear wall portion is defined as an orthogonal plane, a flow rate equalizing means for equalizing the flow rate of air flowing in the orthogonal plane is disposed in front of the air outlet formed at a position closest to the air inlet, and guide means is disposed between the plurality of air outlets connected to the first side wall portion and the second side wall portion, so that a portion of the air that has passed through the flow rate equalizing means hits the air and changes its direction of travel, thereby being guided to the air outlet.

[0008] According to the configuration of the first invention, the inlet is connected to the tip wall portion and the outlet is connected to the first side wall portion and the second side wall portion, so that no extra space is required for piping above or below the branching chamber.

[0009] However, the flow rate of air is not necessarily the same in each part of the opening surface (orthogonal surface) of the inlet, and there may be a bias in the flow rate. For example, the flow rate in the center of the opening surface is generally larger than the flow rate in other parts. However, there may be cases where the flow rate in the upper part of the opening surface is larger than the flow rate in other parts, or the flow rate in the left or right part of the opening surface is larger than the flow rate in other parts. The bias in the flow rate at the inlet continues inside the chamber body, which causes the flow rate of air flowing out from the multiple outlets to differ. In this regard, according to the configuration of the first invention, the flow rate of air flowing in the orthogonal surface is uniformized by the flow rate uniformizing means. As a result, the air passes near the first side wall portion and the second side wall portion, making it easier for the air to flow into the outlet port, especially the front one.

[0010] Furthermore, as the air passes near the first side wall portion and the second side wall portion, a portion of the air reliably hits the guide means, changes its direction of travel, and is guided to the outlet port located in front of the guide means.

[0011] In this way, the flow rate equalizing means has the effect of promoting the air in the chamber body to flow directly into the outlet. The flow rate equalizing means also has the effect of making the guide means function effectively. The air flowing into the outlet located in front of the guide means changes direction significantly toward the outlet once when it hits the guide means, and the air flowing into the outlet located behind the guide means changes direction significantly toward the outlet once when it hits the back wall. This makes it possible to equalize the flow rate from the outlet without requiring extra space above and below and with only a small pressure loss.

[0012] A second aspect of the present invention is a branch chamber according to the first aspect of the present invention, wherein the flow rate equalizing means is a mesh member having an opening ratio of 50% or more.

[0013] According to the configuration of the second aspect of the invention, the flow rate equalizing means is a mesh member with an opening ratio of 50% or more, so that it does not provide a large resistance to the air flow.

[0014] A third aspect of the present invention is a branch chamber according to the first aspect of the present invention, wherein the flow rate equalizing means is a mesh member having an opening ratio of 60% or more and 95% or less.

[0015] According to the third aspect of the invention, the flow rate equalizing means is a mesh member with an opening ratio of 60% or more and 95% or less, so that it does not provide a large resistance to the air flow.

[0016] A fourth invention is a branching chamber having the configuration of the first invention, wherein the mesh member is composed of a plurality of openings and a mesh body which separates the openings, the mesh body is composed of vertical line portions and horizontal line portions which are perpendicular to each other, and the cross sections of the vertical line portions and horizontal line portions in a direction perpendicular to the longitudinal direction are formed convexly toward the inlet.

[0017] According to the fourth aspect of the invention, the cross sections of the vertical and horizontal lines are formed to be convex toward the inlet, so that the air that hits the net body is unlikely to bounce back in the opposite direction, and the net member does not provide a large resistance to the air flow.

[0018] A fifth invention is a branch chamber configured as any one of the first to fourth inventions, wherein the guide means is a plate-shaped member, and when a line segment connecting the center of the inner surface of the tip wall portion and the center of the inner surface of the rear wall portion is taken as a center line, the guide means extends in a direction from the first side wall portion and the second side wall portion toward the center line, and the portion of the guide means extending in the direction toward the center line is formed in an arc shape when viewed from the tip wall portion side, and the portion corresponding to the center line is configured to protrude the most.

[0019] According to the configuration of the fifth invention, the guide means is formed in an arc shape when viewed from the tip wall side, and is configured so that the portion corresponding to the center line protrudes the most. Therefore, the air can be efficiently guided to the outlet located in front of the guide means without excessively impeding the air flow. Effect of the Invention

[0020] According to the branch chamber of the present invention, no extra space is required above or below, and the flow rate from the outlet can be made uniform despite the small pressure loss. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a schematic perspective view of a branch chamber according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic perspective view of a chamber body. [Diagram 3] 3A to 3C are schematic plan, side and front views of a branching chamber; [Figure 4] 3A to 3C are a schematic plan view, a schematic side view, and a schematic front view for explaining the dimensions of a branch chamber. [Diagram 5] FIG. 1 is a schematic diagram showing a component made of a microduct plate. [Figure 6] FIG. 2 is a schematic diagram showing a member made of galvanized steel sheet. [Figure 7] FIG. 2 is a schematic diagram showing members made of galvanized steel sheet. [Figure 8] FIG. 2 is a schematic diagram showing a mesh member. [Figure 9] 4A to 4C are partial enlarged views of a mesh member, etc. [Figure 10] FIG. 4 is a conceptual diagram showing the flow of air passing through a mesh member. [Figure 11] FIG. 4 is a schematic diagram showing a guide member. [Figure 12] 1A-1C are schematic diagrams showing a method for manufacturing a branch chamber. [Figure 13] 1A-1C are schematic diagrams showing a method for manufacturing a branch chamber. [Figure 14] 1A-1C are schematic diagrams showing a method for manufacturing a branch chamber. [Figure 15] FIG. 1 is a schematic diagram showing a measurement method. [Figure 16] FIG. [Figure 17] FIG. 1 is a conceptual diagram showing an air flow. [Figure 18] FIG. 1 is a conceptual diagram showing an air flow. [Figure 19] FIG. 6 is a schematic diagram showing a mesh member according to a second embodiment. [Figure 20] FIG. 10 is a schematic diagram showing a mesh member according to a third embodiment. [Figure 21] FIG. 13 is a schematic view showing a guide member according to a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Note that the description of configurations that can be appropriately implemented by those skilled in the art will be omitted, and only the basic configuration of the present invention will be described.

[0023] First Embodiment The configuration of the branch chamber 1 (hereinafter referred to as "chamber 1") will be outlined with reference to Figs. 1 and 2. Fig. 1(a) is a schematic perspective view showing the outer shape of the chamber 1. Fig. 1(b) is a schematic perspective view in which the outer parts are drawn with dotted lines to show the internal structure of the chamber 1. Fig. 2(a) is a schematic perspective view showing the outer shape of the chamber main body 20 (hereinafter referred to as "main body 20"). Fig. 2(b) is a schematic perspective view in which the outer parts are drawn with dotted lines to show the internal structure of the main body 20.

[0024] <Chamber body configuration> As shown in Figures 2(a) and 2(b), the main body 20 is configured in the shape of a hollow box that is long in one direction. The main body 20 has a tip wall portion 24, a rear wall portion 26, a first side wall portion 22A, a second side wall portion 22C, a bottom wall portion 22B, and a ceiling wall portion 22D. The first side wall portion 22A and the second side wall portion 22C are disposed in opposing positions. The bottom wall portion 22B and the ceiling wall portion 22D are disposed in opposing positions. The tip wall portion 24 and the rear wall portion 26 are disposed in opposing positions.

[0025] In this specification, in the direction connecting the tip wall portion 24 and the rear wall portion 26 (hereinafter referred to as the "longitudinal direction"), the tip wall portion 24 side is defined as the front, and the rear wall portion 26 side is defined as the rear. The frontmost portion is defined as the tip portion, and the rearmost portion is defined as the rear end portion. The tip wall portion 24 side is defined as the front side, and the rear wall portion 26 side is defined as the rear side. As shown in Figures 2(a) and 2(b), the main body 20 is formed into a rectangular parallelepiped that is long in the longitudinal direction.

[0026] 2(a) and 2(b), the peripheral wall portion 22 is formed by the first side wall portion 22A, the second side wall portion 22C, the bottom wall portion 22B, and the ceiling wall portion 22D. The tip wall portion 24 is disposed so as to close the tip portion of the peripheral wall portion 22. The rear wall portion 26 is disposed so as to close the rear end portion of the peripheral wall portion 22.

[0027] 2(a) and 2(b), an inlet 30 for allowing air to flow into the main body 20 is connected to the center of the tip wall portion 24. The air flowing into the main body 20 through the inlet 30 is air whose temperature and humidity have been adjusted by, for example, an air conditioner.

[0028] The first side wall portion 22A and the second side wall portion 22C each have a plurality of outlets 32A and the like formed at different positions in the longitudinal direction. The outlets 32A and 32C are connected to the first side wall portion 22A, and the outlets 32B and 32D are connected to the second side wall portion 22C. Air flows out of the main body 20 from the outlets 32A to 32D. The outlets 32A to 32D are cylindrical members having the same diameter (inner diameter).

[0029] The tip wall 24 is formed with an opening having a diameter substantially equal to the outer diameter of the inlet 30, and is configured to be able to fit the inlet 30. Similarly, the first side wall 22A and the second side wall 22C are formed with openings having a diameter substantially equal to the outer diameter of the outlets 32A to 32D.

[0030] As shown in Fig. 2(b), a line segment SL connecting the center of the tip wall portion 24 and the center of the rear wall portion 26 in a front view is considered, and a plane perpendicular to the line segment SL is considered, and this plane is defined as an orthogonal plane. That is, the orthogonal plane is a plane perpendicular to the longitudinal direction. In other words, the orthogonal plane is a plane parallel to the inner surface of the tip wall portion 24 and the inner surface of the rear wall portion 26. The orthogonal plane can be considered at any position in the longitudinal direction of the main body 20.

[0031] As shown in Figures 2(a) and 2(b), a mesh member 40 is disposed in front of the outlets 32A and 32B formed at the position closest to the inlet 30 in the longitudinal direction. The mesh member 40 is a member for equalizing the flow rate of air flowing in the orthogonal plane, and is an example of a flow rate equalizing means. Note that "equalization" does not mean that the flow rate of air flowing is made completely uniform in all parts of the orthogonal plane. It means that the flow rate in the orthogonal plane is closer to the same after passing through the mesh member 40 than it was before passing through the mesh member 40.

[0032] Inside the main body 20, a guide member 50A is disposed on the first side wall portion 22A, and a guide member 50B is disposed on the second side wall portion 22C. The guide member 50A is disposed between the outlets 32A and 32C, and the guide member 50B is disposed between the outlets 32B and 32D. The guide members 50A and 50B are configured so that a portion of the air that has passed through the mesh member 40 hits the guide members 50A and 50B, causing the air to change its direction of travel and be guided to the outlets 32A and 32B.

[0033] <External configuration of branch chamber> 1(a) and (b), a portion of the main body 20 is covered with an outer frame 10 formed of a metal plate. Specifically, the tip wall portion 24, the rear wall portion 26, the first side wall portion 22A, and the second side wall portion 22C are covered with the outer frame 10. Most of the bottom wall portion 22B and the ceiling wall portion 22D are not covered with the outer frame 10 and are exposed.

[0034] The outer frame 10 is formed with an opening having a diameter substantially the same as the outer diameter of the inlet at a position corresponding to the inlet 30, and is configured so that the inlet 30 can be fitted therein. Similarly, the outer frame 10 is formed with openings having a diameter substantially the same as the outer diameter of the outlets 32A to 32D at positions corresponding to the outlets 32A to 32D.

[0035] A cylindrical inlet 30 is fitted to the body 20 and the outer frame 10 in a manner that passes through openings in the body 20 and the outer frame 10. Also, cylindrical outlets 32A to 32D are fitted to the body 20 and the outer frame 10 in a manner that passes through openings in the body 20 and the outer frame 10.

[0036] <Air flow and dimensions in chamber 1> FIG. 3(a) is a schematic plan view of the chamber 1, FIG. 3(b) is a schematic side view of the chamber 1, and FIG. 3(c) is a schematic front view of the chamber 1. As shown in FIG. 3(a), air sent from the direction of the arrow X1 flows into the chamber 1 from the inlet 30 and flows out through the outlets 32A to 32D into the ducts 80A to 80D connected to the outlets 32A to 32D, respectively. The amount of air flowing out to the ducts 80A to 80D is substantially the same as shown by the arrows Y1A to Y1D. In this specification, the term "substantially the same" means that the deviation from the reference flow rate is within 10% (percent). The ducts 80A to 80D are, for example, sound-proof flexible ducts.

[0037] The relative dimensions of each part of the chamber 1 will be described with reference to Fig. 4. Fig. 4(a) is a schematic plan view seen through the inside of the chamber 1. Fig. 4(b) is a schematic side view of the chamber 1. Fig. 4(c) is a schematic front view of the chamber 1.

[0038] As shown in Figures 4(a) and 4(c), the width of the inside of the outer frame 10 is width W1, while the width of the internal space of the main body 20 is width W2, and width W2 is smaller than width W1 by the thickness w22 (see Figure 5(a)) of the microduct plates on both sides that make up the main body 20. Thickness w22 is 25 millimeters (mm). Therefore, the thickness of the microduct plates on both sides is 50 millimeters (mm). Therefore, width W1 is 400 millimeters (mm) and W2 is 350 millimeters (mm).

[0039] The diameter (inner diameter) of the inlet 30 is a diameter d30, and the diameter (inner diameter) of the outlets 32A to 32D is a diameter d32. The diameter d32 is smaller than the diameter d30. The diameter d30 is 250 millimeters (mm), and the diameter d32 is 175 millimeters (mm).

[0040] The width of the space between the guide members 50A and 50B is width W3. The width W3 is determined by the extent to which the guide members 50A and 50B extend toward the center line SL (hereinafter referred to as the "extension width"). The extension width of the guide members 50A and 50B is determined as a length that allows the air flowing in from the inlet 30 to flow out from the outlets 32A to 32D at a uniform flow rate in the configuration of the chamber 1. The extension width is width W8. The ratio of the width of the internal space of the main body 20 to the width W2 (W8×2 / W2, hereinafter referred to as the "extension ratio") is in the range of 0.30 to 0.60, preferably in the range of 0.35 to 0.50, and more preferably in the range of 0.40 to 0.50. In this embodiment, W8 is 80 millimeters (mm), and W2 is 350 millimeters (mm) as described above, so the extension ratio is about 0.46. In this embodiment, the width W3 is 190 millimeters (mm).

[0041] As shown in Fig. 4(b), the height of the inside of the chamber 1 is height H1, while the height of the internal space of the main body 20 is height H2, and height H2 is smaller than height H1 by the thickness w22 (see Fig. 5(a)) of the microduct plates on the ceiling and bottom surfaces that constitute the main body 20. For this reason, height H1 is 350 millimeters (mm), and height H2 is 300 millimeters (mm).

[0042] The length of the inside of the chamber 1 is L1, while the length of the internal space of the main body 20 is L2, and the length L2 is smaller than L1 by the thickness w22 (see FIG. 5(a)) of the microduct plates at the front and rear ends that constitute the main body 20. For this reason, the length L1 is 750 millimeters (mm), and the length L2 is 700 millimeters (mm).

[0043] The width W1 is greater than the height H1. And the length L1 is greater than the width W1. Therefore, the outline of the chamber 1 is a flattened rectangular parallelepiped that is elongated in the direction of the line segment SL. Similarly, the width W2 is greater than the height H2. And the length L2 is greater than the width W2. Therefore, the outline of the main body 20 is a flattened rectangular parallelepiped that is elongated in the direction of the line segment SL.

[0044] <About each component> Next, there will be described each of the members constituting the chamber 1. Figures 5, 6, 7, 8, and 9 are diagrams showing the main members constituting the chamber 1.

[0045] FIG. 5 is a diagram showing a member formed by processing a microduct plate. A microduct plate, also known as a glass board, is a material made by solidifying glass fiber with a thermosetting resin and finishing the outer part with aluminum foil reinforced with glass thread. The microduct plate has excellent heat insulation and soundproofing properties, and can transport air quietly without significantly changing the air temperature. In addition, the microduct plate is lightweight, and is much lighter than the steel plates generally used for ducts. The microduct plate of this embodiment weighs approximately 64 kilograms per cubic meter (kg / m 3If the member formed by processing the microduct plate in this embodiment were made of a metal steel plate, the weight would be increased by about 35% (percent).

[0046] 5(a) shows a state in which the peripheral wall portion 22 is unfolded. The peripheral wall portion 22 in the state shown in FIG.

[0047] As shown in Fig. 5(a), the microduct plate is a plate-shaped member having a thickness w22. In this embodiment, the thickness w22 is 25 millimeters (mm). The microduct plate forms a peripheral wall 22 consisting of a first side wall 22A, a second side wall 22C, a bottom wall 22B, and a ceiling wall 22D. In the first side wall 22A, openings 22a and 22c having substantially the same diameter as the outer diameters of the outlets 32A and 32C are formed at different positions in the longitudinal direction (the direction indicated by the arrow X10).

[0048] The second side wall portion 22C has openings 22b and 22d formed at different positions in the longitudinal direction, each having a diameter substantially equal to the outer diameter of the outlets 32B and 32D. In terms of the longitudinal position, the openings 22a and 22b are formed at substantially the same position, and the openings 22c and 22d are formed at substantially the same position. The first side wall portion 22A and the second side wall portion 22C have grooves b1 and b2 for fixing the mesh member 40, and grooves c1 and c2 for fixing the guide members 50A and 50B. A triangular groove a1 with a triangular cross section is formed between the first side wall portion 22A and the bottom wall portion 22B for folding in the direction of the arrow Z1. A triangular groove a2 for folding in the direction of the arrow Z2 is formed between the bottom wall portion 22B and the second side wall portion 22C, and a triangular groove a3 for folding in the direction of the arrow Z3 is formed between the second side wall portion 22C and the ceiling wall portion 22D.

[0049] 5(b) is a diagram showing the tip wall 24 and the rear wall 26. The tip wall 24 and the rear wall 26 are also formed by processing a microduct plate. The tip wall 24 is configured by forming an opening 24b in a main body 24a. The diameter of the opening 24b is substantially the same as the outer diameter of the inlet 30.

[0050] 5(c) is a diagram showing guide parts 50A and 50B. Guide parts 50A and 50B are collectively called "guide part 50." Guide part 50 is also formed by processing a microduct plate.

[0051] 6 is a schematic diagram showing each member that constitutes the outer frame 10. The outer frame 10 is formed by processing a metal plate. The metal plate is, for example, a zinc-plated steel plate having a thickness of 0.6 millimeters (mm).

[0052] Fig. 6(a) is a schematic perspective view showing the first side frame 10a and the second side frame 10b. The first side frame 10a is a member for covering the first side wall portion 22A, and the second side frame 10b is a member for covering the second side wall portion 22C. As shown in Fig. 6(a), the first side frame 10a and the second side frame 10b each have an outer side surface 12a and an inner side surface 12b, and the upper end portion and the lower end portion are bent inward.

[0053] The first side frame 10a has openings 14a and 14c formed at different positions in the longitudinal direction (the direction indicated by the arrow X10). The opening 14a is formed at a position and with a shape corresponding to the opening 22a of the first side wall portion 22A, and the opening 14c is formed at a position and with a shape corresponding to the opening 22c. The second side frame 10b has openings 14b and 14d formed at different positions in the longitudinal direction. The opening 14b is formed at a position and with a shape corresponding to the opening 22b of the second side wall portion 22C, and the opening 14d is formed at a position and with a shape corresponding to the opening 22d.

[0054] Fig. 6(b) is a schematic perspective view showing the tip frame 10c and the back frame 10d. The tip frame 10c is a member for covering the tip wall portion 24, and the back frame 10d is a member for covering the back wall portion 26. As shown in Fig. 6(b), the tip frame 10c is configured by forming an opening 16b in a main body portion 16a. The opening 16b of the tip frame 10c is formed at a position and in a shape corresponding to the opening 24b of the tip wall portion 24. The back frame 10d is configured by a main body portion 18, and the main body portion 18 has no opening formed therein.

[0055] 7(a) is a schematic perspective view showing the inlet 30, FIG. 7(b) is a schematic perspective view showing the outlets 32A to 32D, and FIG.

[0056] The inlet 30 and the outlets 32A to 32D are formed by processing a metal plate. The metal plate is, for example, a zinc-plated steel plate with a thickness of 0.6 millimeters (mm). The inlet 30 is composed of a cylindrical portion 30a and a flange portion 30b. The outlets 32A to 32D are composed of a cylindrical portion 32a and a flange portion 32b.

[0057] <<About mesh members>> The mesh member 40 is composed of a frame portion 40a and a mesh portion 40b. The mesh member 40 will be described in detail below with reference to FIGS.

[0058] As shown in Figures 8(a) to 8(c), the mesh member 40 is configured by fixing a mesh portion 40b to a frame portion 40a. Figure 8(a) shows the mesh member 40 in a front view, and Figure 8(b) shows the frame portion 40a and the mesh portion 40b in a front view. Figure 8(c) is a plan view of the mesh member 40 in Figure 8(a) as viewed from the direction of arrow Z11.

[0059] 8(b), the frame portion 40a is composed of a frame-shaped member 40a1 having a rectangular opening 40a2 formed in the center. In the frame-shaped member 40a1, a mesh portion 40b is fixed to an inner portion 40a1a along the opening 40a2.

[0060] As shown in FIG. 8(a) and FIG. 8(b), the net portion 40b is composed of a plurality of openings 40b2 and a net body 40b1 that divides the openings 40b2. In this embodiment, the openings 40b2 are square openings when viewed from the front. The frame portion 40a is formed by processing a metal plate. The net portion 40b is formed by punching a metal plate. The metal plate is, for example, a zinc-plated steel plate having a thickness of 0.6 millimeters (mm). Specifically, a die having a square cross section perpendicular to the punching direction and a side length of 20.0 millimeters (mm) is prepared, and the die is attached to a turret punch press machine to punch the metal plate to form the square openings 40b2. The metal plate is punched multiple times to form the multiple openings 40b2. The metal plate is punched, and the remaining part becomes the net body 40b1.

[0061] As shown in FIG. 8(a), the frame portion 40a of the mesh member 40 is a member having a width W4 and a height H3. The mesh portion 40b is a member having a width W5 and a height H4. The width W4 is larger than the width W2 of the main body 20 (see FIG. 4(a)) and smaller than the width W1 of the outer frame 10 (see FIG. 4(a)). The height H3 is substantially the same as the height H2 of the main body 20 (see FIG. 4(b)). The width W4 is 370 millimeters (mm), and the width W5 is 312 millimeters (mm). The height H3 is 300 millimeters (mm), and the height H4 is 268 millimeters (mm).

[0062] Fig. 9(a) is a conceptual diagram showing an enlarged view of a region 40p1, which is a part of the net portion 40b in Fig. 8(a). As shown in Fig. 9(a), the net body 40b1 is composed of a plurality of horizontal line portions 40b11 and vertical line portions 40b12. The horizontal line portions 40b11 and the vertical line portions 40b12 are perpendicular to each other. In detail, the extending direction of the horizontal line portions 40b11 and the extending direction of the vertical line portions 40b12 are perpendicular to each other.

[0063] One surface 40b11s and 40b12s of the horizontal line portions 40b11 and the vertical line portions 40b12 are the surfaces in the direction (front side) from which air flows into the chamber 1. In the mesh member 40, the side opposite to the front side is called the back side. Each surface 40b11s and 40b12s is configured to be convex toward the inlet 30. In other words, the cross section of each horizontal line portion 40b11 in a direction perpendicular to the longitudinal direction and the cross section of each vertical line portion 40b12 in a direction perpendicular to the longitudinal direction are smaller on the front side than on the back side. Specifically, the most protruding portion of the surfaces 40b11s and 40b12s is flat, but both sides form an arc (see FIG. 10).

[0064] FIG. 9(b) is a schematic diagram conceptually showing an area 40p1 which is a part of the net part 40b in FIG. 8(a). The width w11 of the net body 40b1 is the width of the horizontal line part 40b11 and the vertical line part 40b12 in a front view (viewed from the direction of the inlet 30), and in this embodiment, it is 2.5 millimeters (mm). The opening 40b2 is a square in a front view, and the length w12 of one side is 20 millimeters (mm). The opening ratio of the net part 40b is set to a predetermined range of 50% or more, preferably 60% to 95%, and more preferably 75% to 95%. In this embodiment, the opening ratio is about 89%. The opening ratio is the ratio of the opening 40b2 to the entire net part 40b. If the area of ​​one opening 40b2 is s1, the opening ratio is the ratio of the total area s1 to the entire net part 40b.

[0065] The aperture ratio is basically determined by the ratio of the width w11 of the horizontal line portion 40b11 and the vertical line portion 40b12 constituting the net body 40b1 to the width w12 of the opening 40b2. The aperture ratio is substantially the same in each part of the net portion 40b. For example, as shown in FIG. 9(b), if the area of ​​the part including the four openings 40b2 is area s2, the ratio of the four areas s1 to area s2 is the aperture ratio. That is, as shown in the formula 1 in FIG. 9(b), the aperture ratio (s1×4 / s2) is determined as a value between predetermined values ​​V1 and V2. The value V1 is 50. Preferably, the value V1 is 60 and the value V2 is 95. More preferably, the value V1 is 75 and the value V2 is 95.

[0066] Next, the function of the net portion 40b will be described with reference to Fig. 10. Fig. 10 is a conceptual diagram showing the function of the net portion 40b when air flows into the chamber 1 from the intake port 30. In Fig. 10, arrows A1 and the like are vectors indicating the flow of air.

[0067] As shown in FIG. 10(a), the opening ratio of the net portion 40b is large at about 89%, so most of the air passes through the opening 40b2 without hitting the net body 40b1. However, some of the air hits the net body 40b1 and changes its direction of travel as shown by the dotted line. Then, the changed air flow also affects the direction of travel of the air that passes through the opening 40b2 without hitting the net body 40b1, and ultimately, most of the air passing through the net portion 40b is directly or indirectly influenced by the net body 40b1. For example, the air flow A5 passes through the opening 40b2 without hitting the net body 40b1, but changes its direction of travel due to the influence of the air flow A1 that hits the net body 40b1 and changes its direction of travel. Here, when focusing on the area of ​​the chamber 1 in the direction perpendicular to the longitudinal direction (perpendicular direction), the area of ​​the chamber 1 is larger than the area inside the suction port 30. In other words, the space of the chamber 1 in the direction perpendicular to the longitudinal direction is larger on the perpendicular plane than the suction port 30. Therefore, the individual air molecules constituting the air flow move with a vector in the longitudinal direction of the chamber 1 at the intake port 30, but when they enter the chamber 1, they have a vector component in the perpendicular direction. Furthermore, as the air flow is divided by the net body 40b1, the air flow in the part with a large flow rate tends to be attracted toward the air flow with a small flow rate. Furthermore, as some of the air molecules hit the net body 40b1, the air molecules passing through the mesh member 40 are directly or indirectly influenced and have a larger vector component in the perpendicular direction. As a result, even if the air flows A1 to A8 are not uniform in flow rate and are not uniform, they spread in the perpendicular direction and become uniform when they pass through the net part 40b.

[0068] In reality, the air flowing into the chamber 1 from the intake port 30 does not have a uniform flow rate in the orthogonal plane, and generally has a larger flow rate in the center, as shown by the difference in thickness of the arrows in FIG. 10(b). Air molecules that have passed through the mesh member 40 and have vector components in the orthogonal direction tend to be drawn in the direction of the air with relatively low pressure and low flow rate. For example, the air flows A12, 13, A16, and A17 in the center have relatively large flow rates. In contrast, the air flows A11, A14, A15, and A18 in the peripheral areas have relatively small flow rates. Then, air molecules that have passed through the mesh member 40 and have vector components in the orthogonal direction tend to be drawn to the peripheral areas. Therefore, even if the air flows A11 to A18 are not uniform in flow rate and are not uniform, they are homogenized when they pass through the mesh portion 40b.

[0069] <<About guide parts>> Next, the guide members 50A and 50B will be described with reference to FIG. 11. As described above, the guide members 50A and 50B are collectively referred to as "guide members 50". FIG. 11(a) is a front view of the guide member 50, FIG. 11(b) is a plan view of the guide member 50 in FIG. 11(a) viewed from the direction of the arrow Z12, and FIG. 11(c) is a side view of the guide member 50 in FIG. 11(a) viewed from the direction of the arrow X12. As shown in FIG. 11(a) to FIG. 11(c), the guide member 50 is a plate-shaped member having a thickness 50w1. The thickness 50w1 is the thickness of the microduct plate, and is 25 millimeters (mm). The guide member 50 is configured to have a height 50h and a width W6. The height 50 is 300 millimeters (mm), and the width W6 is 92.5 millimeters (mm).

[0070] Of the width W6, the width of the base 50a is width W7, and the width of the extension 50b is width W8. The base 50a is a portion fixed to the main body 20, and the extension 50b is a portion extending into the space inside the main body 20. The outer edge of the extension 50b is formed in an arc shape, and the central portion 50c in the height direction protrudes the most. The width W7 of the base 50a is 12.5 millimeters (mm), and the width W8 of the extension 50b is 80.0 millimeters (mm).

[0071] The outer edge of the extension portion 50b is formed in an arc shape, so as not to excessively impede the air flow in the longitudinal direction inside the main body 20. Also, while the central portion of the orthogonal plane inside the main body 20 is likely to have the highest flow rate, the central portion 50c in the height direction of the extension portion 50b protrudes the most, so that the flow direction of the air near the central portion of the orthogonal plane inside the main body 20 can be changed and led to the outlets 32A and 32B, thereby efficiently realizing uniform flow rate.

[0072] <Method of manufacturing the branch chamber> Hereinafter, an outline of a method for manufacturing the chamber 1 will be described with reference to FIGS. 12 to 14. As shown in FIGS. 12(a) and 12(b), in a state before folding the peripheral wall portion 22 shown in FIG. 5(a), the outlets 32A to 32D are inserted into the openings 22a to 22d from the inside. Also, the guide members 50A and 50B are fixed to the first side wall portion 22A and the second side wall portion 22C. After that, the peripheral wall portion 22 is folded to form a cylindrical shape with a rectangular parallelepiped cross section. Note that, in FIG. 12(a), for convenience of explanation, a folded state is shown with the guide members 50A and 50B not fixed. In reality, as shown in FIG. 12(b), the outlets 32A to 32D and the guide members 50A and 50B are fixed to the peripheral wall portion 22, and then the peripheral wall portion 22 is folded.

[0073] Next, the folded state of the peripheral wall portion 22 is slightly released, and as shown in FIG. 13(a), the mesh member 40 is fixed at a position forward of the outflow ports 32A and 32B. Next, as shown in FIG. 13(b) and FIG. 13(c), the cylindrical portion 30a of the inflow port 30 is inserted into the opening 24b of the tip wall portion 24 and fixed. With the flange portion 30b in contact with the back surface of the main body portion 24a, the inflow port 30 is fixed to the tip wall portion 24. Next, as shown in FIG. 14(a), the tip wall portion 24 to which the inflow port 30 is fixed is fixed to the front end portion of the peripheral wall portion 22. Also, the back wall portion 26 is fixed to the rear end portion of the peripheral wall portion 22. This forms the main body 20. Next, as shown in FIG. 14(b), the outer frame 10 is fixed to the main body 20. This assembles the chamber 1. The outer frame 10 is fixed by screws or the like as appropriate. In addition, in reality, in the outer frame 10, reinforcing metal fittings are connected to the first side wall portion 22A and the second side wall portion 22C to connect the two and strengthen the structure of the outer frame 10, and a hanging member is also connected to hang the chamber 1 from the ceiling of a building, but the description of this is omitted in this specification.

[0074] <Air flow rate measurement> Next, the measurement of the air flow rate in the chamber 1 will be described with reference to Figs. 15 and 16. Fig. 15 is a schematic diagram showing a measurement method. As shown in Fig. 15(a), the chamber 102 is connected to the blower 100 via a duct 120. The chamber 102 is connected to the chamber 1 via a duct 122. The chamber 102 is configured to adjust the difference in diameter between the duct 120 extending from the blower 100 and the duct 122 connecting to the chamber 1. The air blown from the blower 100 flows in the direction of the arrow X1. A measurement probe 104 of a micro-differential pressure gauge (Manostar gauge, for example, WO81 FS manufactured by Yamamoto Electric Works) and a measurement probe 106 of an anemometer (Anemomaster MODEL 6115 manufactured by Kanomax, Anemomaster measurement software MODEL 6000-40 manufactured by Kanomax) are arranged in front of the chamber 1 (50 to 100 mm in front). Air volume is calculated based on wind speed and the opening area of ​​the passageway.

[0075] 15(b), the wind speed is measured at the outlets 32A to 32D of the chamber 1. For each of the outlets 32A to 32D, the wind speed is measured at a plurality of positions, i.e., positions P1 to P9, on the opening surface as viewed from the arrows T1 to T4. The measurement probe 104 of the micro-differential pressure gauge described above is also disposed at positions P1 to P9 of each of the outlets 32A to 32D, and the difference with the static pressure before the chamber 1 is measured by the micro-differential pressure gauge.

[0076] 16 is a diagram showing the measurement data. The wind speed at a position in front of the chamber 1 where the measurement probe 106 was placed was 5.5 meters per second (m / s). The air volume was 980 cubic meters per hour (CMH: Cubic Meter per Hour).

[0077] The reference average wind speed is set to 2.83 (m / s) for the four outlets 32A to 32D, and if the deviation from the reference average wind speed for any of the outlets 32A to 32D is within 10%, the wind speed of the air flowing out of the outlets 32A to 32D is considered to be substantially the same and uniform. The average speed is the average speed of the wind speed measured at the above-mentioned positions P1 to P9. In Figures 16(a) and 16(b), "A" indicates outlet 32A, "B" indicates outlet 32B, "C" indicates outlet 32C, and "D" indicates outlet 32D. The measurement results for each position P1 to P9 are shown in Figure 16(b). As shown in FIG. 16(a), the average speed at the outlets 32A to 32D is 2.76 (m / s) to 2.89 (m / s), and the deviation from the reference average wind speed of 2.83 (m / s) is within 3%, so it can be said that the wind speed of the air flowing out from the outlets 32A to 32D is substantially uniform.

[0078] The air volume is determined as a standard average air volume of 245 CMH, and if the deviation of the air volume flowing out of each outlet 32A to 32D from the standard air volume is within 10%, the air volume flowing out of the outlet 32A to 32D is considered to be substantially uniform. The average flow rate of each outlet 32A to 32D is the average value of the flow rate calculated based on the wind speed measured at the above-mentioned positions P1 to P9 and the opening area of ​​each of the positions P1 to P9. The measurement results of each position P1 to P9 are shown in FIG. 16(b). As shown in FIG. 16(a), the average flow rate at the outlet 32A to 32D is 238 CMH to 250 CMH, and the deviation of the standard average wind speed of 245 CMH is within 3%, so it can be said that the air volume flowing out of the outlet 32A to 32D is substantially uniform.

[0079] Regarding pressure loss, the reference average pressure loss is set to 7 Pascals (Pa), and if the actual pressure loss is 7 Pascals or less, the pressure loss is evaluated as being sufficiently small. The pressure loss was calculated by averaging the difference between the static pressure before the chamber 1 and the static pressure at positions P1 to P9 of each of the outlets 32A to 32D to calculate the pressure loss at each outlet 32A to 32D, and the pressure losses at the outlets 32A to 32D were then averaged to obtain the final average value. As a result, the pressure loss was 3 Pascals. Therefore, the pressure loss can be evaluated as being sufficiently small.

[0080] <Supplementary explanation> Next, with reference to Figures 17 and 18, the air flow due to the configuration of chamber 1 will be described in comparison with the air flow in configurations other than chamber 1. Figures 17 and 18 are conceptual diagrams showing the air flow in chamber 1 etc. In Figures 17 and 18, the solid and dotted arrows indicate the air flow.

[0081] FIG. 17(a) is a conceptual diagram showing the flow of air in the chamber 1. The air flowing into the chamber 1 from the inlet 30 is uniformized by passing through the mesh member 40 even if there is a difference in wind speed or volume in the perpendicular plane. This makes it easier for the air to flow into the outlets 32A and 32B, and also makes it easier for the air to hit the guide members 50A and 50B and change its direction of travel to flow toward the outlets 32A and 32B. Since the guide members 50A and 50B do not reach the center of the chamber 1 in the width direction, some of the air flows toward the back wall 26 without hitting the guide members 50A and 50B. As a result, some of the air flows directly into the outlets 32C and 32D, and some of the air hits the back wall 26 and changes its direction of travel to flow into the outlets 32C and 32D. At this time, the air as a whole flows from the tip wall 24 side to the rear wall 26 side, but when focusing on each air molecule, it has a vector component in a direction different from the straight direction by passing through the mesh member 40. Therefore, it is highly likely that the air will hit the rear wall 26 at an angle other than 90 degrees, rather than hitting the rear wall 26 at 90 degrees. Therefore, when the air hits the rear wall 26, it is highly likely that the angle will be efficiently changed and the air will flow into the outlets 32C and 32D. As a result, the wind speed and volume of the air flows Y1A to Y1D flowing out from the outlets 32A to 32D are uniform, and the pressure loss is small, which also saves energy.

[0082] FIG. 17(b) is a diagram showing the chamber 1X. Unlike the chamber 1, the chamber 1X does not include the mesh member 40 and the guide members 50A and 50B. When there is a difference in wind speed or volume in the orthogonal plane, the air flowing into the chamber 1X from the inlet 30 flows toward the back wall 26 in the chamber 1X. Even if there is no difference in wind speed or volume in the orthogonal plane, the air is not easily diffused in the orthogonal plane direction, so the amount of air flowing along the first side wall 22A and the second side wall 22C side is small. Therefore, the air is not easily flowed into the outlets 32A and 32B. Most of the air directly hits the back wall 26, changes its direction, and flows into the outlets 32C and 32D. Therefore, the air flows Y1AX and Y1BX flowing out from the outlets 32A and 32B have smaller wind speeds and volumes than the air flows Y1CX and Y1DX flowing out from the outlets 32C and 32D. For example, in terms of airflow, the ratio of the front outlets 32A and 32B to the rear outlets 32C and 32D is about 2:8.

[0083] FIG. 18(a) is a diagram showing the chamber 1Y. Unlike the chamber 1, the chamber 1Y does not include the guide members 50A and 50B. The air flowing into the chamber 1Y from the inlet 30 is homogenized by passing through the mesh member 40 even if there is a difference in wind speed or volume in the perpendicular plane. This makes it easier for the air to flow into the outlets 32A and 32B. However, most of the air flows toward the back wall 26. As a result, some of the air hits the back wall 26 and changes its direction of travel, and flows into the outlets 32C and 32D. At this time, the air as a whole flows from the tip wall 24 side to the back wall 26 side, but when attention is paid to each air molecule, it has a vector in a direction different from the straight direction by passing through the mesh member 40. Therefore, it is highly likely that the air will hit the back wall 26 at an angle other than 90 degrees, rather than hitting it at 90 degrees. Therefore, when the air hits the rear wall portion 26, the angle is efficiently changed, and it is highly likely that the air will flow into the outlets 32C and 32D. In the chamber 1Y, the air flows Y1AY and Y1BY flowing out from the outlets 32A and 32B are smaller in both speed and volume than the air flows Y1CY and Y1DY flowing out from the outlets 32C and 32D. For example, in terms of volume, the ratio of the front outlets 32A and 32B to the rear outlets 32C and 32D is about 3:7.

[0084] FIG. 18(b) is a diagram showing the chamber 1Z. Unlike the chamber 1, the chamber 1Z does not include a mesh member 40. When there is a difference in wind speed or volume in the orthogonal plane, the air flowing into the chamber 1Z from the inlet 30 flows toward the back wall 26 in the chamber 1Z. Even if there is no difference in wind speed or volume in the orthogonal plane, the air is not easily diffused in the orthogonal plane direction, so the amount of air flowing along the first side wall 22A and the second side wall 22C side is reduced. However, some of the air hits the guide members 50A and 50B, changes its direction of travel, and flows toward the outlets 32A and 32B. Since the guide members 50A and 50B do not reach the center of the chamber 1 in the width direction, some of the air flows toward the back wall 26 without hitting the guide members 50A and 50B. As a result, a portion of the air flows directly into the outlets 32C and 32D, and a portion of the air changes direction after hitting the rear wall portion 26 and flows into the outlets 32C and 32D. Therefore, the air flows Y1AZ and Y1BZ flowing out from the outlets 32A and 32B have a smaller wind speed and volume than the air flows Y1CZ and Y1DZ flowing out from the outlets 32C and 32D. For example, in terms of volume, the ratio of the front outlets 32A and 32B to the rear outlets 32C and 32D is about 4:6.

[0085] From the above, it is clear that the configuration of the chamber 1 including the mesh member 40 and the guide members 50A and 50B is useful for making the flow rate of the air flowing out from the outlets 2A to 32D uniform.

[0086] Second Embodiment

[0087] Next, a second embodiment will be described with reference to Fig. 19. Descriptions of parts common to the first embodiment will be omitted, and only parts different from the first embodiment will be described.

[0088] As shown in Fig. 19(a), the second embodiment has a mesh member 40X instead of the mesh member 40 of the first embodiment. The mesh body 40b3 is composed of a plurality of horizontal line portions 40b31 and a plurality of vertical line portions 40b32. The surfaces 40b31s and 40b32s of the horizontal line portions 40b31 and the vertical line portions 40b32 are each configured to be convex toward the inlet 30. Specifically, the surfaces 40b31s and 40b32s form a circular arc.

[0089] 19(b), the horizontal line portion 40b31 and the vertical line portion 40b32 are each formed so that the longitudinal cross section thereof is semicircular, thereby reducing the possibility that the air that hits the net body 40b3 of the net member 40X is subjected to a force in the opposite direction. <Third embodiment>

[0090] Next, a third embodiment will be described with reference to Fig. 20. Descriptions of parts common to the first embodiment will be omitted, and only parts different from the first embodiment will be described.

[0091] As shown in Fig. 20, the third embodiment has a mesh member 40Y instead of the mesh member 40 of the first embodiment. The mesh body 40b4 is configured by combining a plurality of horizontal line portions 40b41 and a plurality of vertical line portions 40b42. Each surface 40b41s and 40b42s of the horizontal line portion 40b41 and the plurality of vertical line portions 40b42 are configured to be convex toward the inlet 30. Specifically, the surfaces 40b41s and 40b42s form a circular arc.

[0092] The horizontal line portion 40b41 and the vertical line portion 40b42 are each formed to have a circular cross section in the longitudinal direction, which reduces the possibility that the air that hits the net body 40b4 of the net member 40Y will be subjected to a force in the opposite direction. <Fourth embodiment>

[0093] Next, a fourth embodiment will be described with reference to Fig. 21. Descriptions of parts common to the first embodiment will be omitted, and only parts different from the first embodiment will be described.

[0094] As shown in Fig. 21, the fourth embodiment has guide members 51 (51A, 51B) instead of the guide member 50 of the first embodiment. Of the width W6, the width of base 51a is width W7, and the width of extension portion 51b is width W8. Base 51a is a portion fixed to main body 20, and extension portion 51b is a portion that extends into the space inside main body 20. The outer edge of extension portion 51b is formed into a rectangle.

[0095] The branch chamber of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and scope of the present invention. Furthermore, the above-described embodiments can be combined as appropriate as long as no technical contradiction occurs. [Explanation of symbols]

[0096] 1 Branch chamber 10 Outer Frame 20 Main unit 22 Peripheral wall section 22A First side wall part 22B Bottom wall part 22C Second side wall part 22D Ceiling wall section 22a,22b,22c,22d opening 24 Tip wall 24b opening 26 Back wall 30 Inlet 32A, 32B, 32C, 32D Outlet 40, 40X, 40Y Mesh members 50A, 50B, 51A, 51B Guide members

Claims

1. A branch chamber having a chamber body in the shape of a hollow box that is long in one direction, the chamber body has a front wall portion, a rear wall portion, a first side wall portion, a second side wall portion, a bottom wall portion, and a ceiling wall portion; The first side wall portion and the second side wall portion are disposed in opposing positions, The bottom wall portion and the ceiling wall portion are disposed in opposing positions, a peripheral wall portion is formed by the first side wall portion, the second side wall portion, the bottom wall portion, and the ceiling wall portion, The tip wall portion is disposed to close the tip portion of the peripheral wall portion, The inner wall portion is disposed so as to close a rear end portion of the peripheral wall portion, An inlet for allowing air to flow into the chamber body is connected to the tip wall portion, a plurality of outlets for allowing air to flow out of the chamber body are connected to the first side wall portion and the second side wall portion at different positions in a longitudinal direction, and no outlets are connected to the inner wall portion; Within the chamber body, When the tip wall side is defined as a front side, the rear wall side is defined as a rear side, and a plane parallel to the inner surface of the tip wall side and the inner surface of the rear wall side is defined as an orthogonal plane, a flow rate equalizing means for equalizing the flow rate of air flowing in the orthogonal plane is disposed in front of the outlet port formed at a position closest to the inlet port, a guide means is disposed between the plurality of outlets connected to the first side wall portion and the second side wall portion, so that a portion of the air that has passed through the flow rate equalizing means is hit by the guide means to change a traveling direction and is guided to the outlet, when a line segment connecting a center of an inner surface of the tip wall portion and a center of an inner surface of the back wall portion is defined as a center line, the guide means extends in a direction from the first side wall portion and the second side wall portion toward the center line, When a direction connecting the first side wall portion and the second side wall portion is defined as a width direction, a space including the center line exists in the width direction between the guide means arranged on the first side wall portion and the guide means arranged on the second side wall portion. Branch chamber.

2. the flow rate equalizing means is a mesh member having an opening ratio of 50% or more; a width W3 of the space between the guide means arranged on the first side wall portion and the guide means arranged on the second side wall portion is defined by an extension width W8, which is a degree to which the guide means arranged on the first side wall portion and the guide means arranged on the second side wall portion extend toward the center line; The ratio (W8×2 / W2) of twice the extension width W8 to the width W2 of the internal space of the chamber body is in the range of 0.30 to 0.

60. The bifurcated chamber of claim 1 .

3. 2. The branch chamber according to claim 1, wherein the flow rate equalizing means is a mesh member having an opening ratio of 75% or more and 95% or less.

4. The mesh member is composed of a plurality of openings and a mesh body that divides the openings, The net body is composed of vertical and horizontal lines that are perpendicular to each other, The branch chamber according to claim 2 , wherein a cross section of each of the vertical line portions and the horizontal line portions in a direction perpendicular to the longitudinal direction is formed in a convex shape toward the inlet.

5. A branch chamber having a chamber body having a hollow box shape that is long in one direction, the chamber body has a front wall portion, a rear wall portion, a first side wall portion, a second side wall portion, a bottom wall portion, and a ceiling wall portion; The first side wall portion and the second side wall portion are disposed in opposing positions, The bottom wall portion and the ceiling wall portion are disposed in opposing positions, a peripheral wall portion is formed by the first side wall portion, the second side wall portion, the bottom wall portion, and the ceiling wall portion, The tip wall portion is disposed to close the tip portion of the peripheral wall portion, The inner wall portion is disposed so as to close a rear end portion of the peripheral wall portion, An inlet for allowing air to flow into the chamber body is connected to the tip wall portion, a plurality of outlet ports for allowing air to flow out of the chamber body are connected to the first side wall portion and the second side wall portion at different positions in a longitudinal direction; Within the chamber body, When the tip wall side is defined as a front side, the rear wall side is defined as a rear side, and a plane parallel to the inner surface of the tip wall side and the inner surface of the rear wall side is defined as an orthogonal plane, a flow rate equalizing means for equalizing the flow rate of air flowing in the orthogonal plane is disposed in front of the outlet port formed at a position closest to the inlet port, a guide means is disposed between the plurality of outlets connected to the first side wall portion and the second side wall portion, so that a portion of the air that has passed through the flow rate equalizing means is hit by the guide means to change a traveling direction and is guided to the outlet, The guide means is a plate-shaped member, when a line segment connecting a center of an inner surface of the tip wall portion and a center of an inner surface of the back wall portion is defined as a center line, the guide means extends in a direction from the first side wall portion and the second side wall portion toward the center line, The portion of the guide means extending in a direction toward the center line is formed in an arc shape when viewed from the tip wall portion side, and is configured so that the portion corresponding to the center line protrudes most. Branch chamber.

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