Ventilator

Abstract

To provide a technology which increases the air quantity.SOLUTION: A ventilation fan includes a frame and an impeller 200. The frame has a box shape and is open at the windward side and the leeward side. The impeller 200 is disposed within the frame. A boss part 230 is disposed at a center portion of the impeller 200. The impeller 200 has multiple wings 240 at an outer periphery of the boss part 230. The wing 240 protrudes toward the windward side and partially lowers toward the leeward side.SELECTED DRAWING: Figure 4

Description

Technical field

[0001] The present disclosure relates to a ventilation fan that generates airflow by rotating an impeller. [Background technology]

[0002] In blades used in ventilation fans, the leading edge of the outer edge of the blade is tapered in order to smooth the inflow of airflow and reduce noise (see, for example, Patent Document 1). [Prior art documents] [Patent document]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2015-183604 [Summary of the invention] [Problem to be solved by the invention]

[0004] In the blades used in ventilation fans, it is required to increase the air volume even if the size of the blades is the same.

[0005] The present disclosure has been made to solve the above problems, and aims to provide a technique for increasing air volume. [Means to solve the problem]

[0006] In order to solve the above problems, a ventilation fan according to an aspect of the present disclosure includes a box-shaped frame that is open on the windward side and the leeward side, and a plurality of blades that are arranged inside the frame and fixed to the outer periphery of the boss part. It is equipped with an impeller. The blade protrudes toward the windward side and partially sinks toward the leeward side.

Effect of the invention

[0007] According to the present disclosure, the air volume can be increased. [Brief explanation of drawings]

[0008]

Figure 1

Figure 2

[0009] DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present disclosure will be described below in the order of (1) basic structure and (2) impeller structure with reference to the accompanying drawings. (1) Basic structure 1(a)-(d) show the external structure of the ventilation fan 1000. 1(a)-(b) show the structure of the ventilation fan 1000 when the shutter 410 is closed, and FIGS. 1(c)-(d) show the structure of the ventilation fan 1000 when the shutter 410 is open. show. FIG. 2 is an exploded perspective view showing the structure of ventilation fan 1000. The frame 100 has a box-like shape, and has an upwind opening 102 opening at the front and a leeward opening 104 opening at the rear. The front side is the left side in Figure 2, and corresponds to the indoor side and the windward side. The rear side is the right side in Figure 2, and corresponds to the outdoor side and leeward side.

[0010] Inside the frame 100, there is an impeller 200 equipped with a spinner 210 on the windward side, a motor 220 that is connected to the impeller 200 from the leeward side and drives the impeller 200, and a motor support that supports the motor 220 from the leeward side. 222 will be provided. That is, impeller 200 and motor 220 are fixed to frame 100 by motor support 222.

[0011] The frame 100 is provided with a frame-shaped flange 110 surrounding the windward opening 102. An orifice 300 that serves as a wind trunk of an impeller 200 is attached to the flange 110 from the windward side. Orifice 300 has a circular opening 310 in the central portion. With orifice 300 attached to flange 110, impeller 200 and spinner 210 are exposed from opening 310.

[0012] In the leeward opening 104 of the frame 100, a first shutter 410a to a third shutter 410c, which can be opened and closed, are arranged. The first shutter 410a is arranged at the bottom, the second shutter 410b is arranged above the first shutter 410a, and the third shutter 410c is arranged above the second shutter 410b. The first shutter 410a to the third shutter 410c are collectively referred to as shutters 410. The shutter 410 is supported from both sides by a first shutter support plate 400a and a second shutter support plate 400b, and is opened and closed by vertical movement of the coupling rod 500. The coupling rod 500 is moved up and down by a switch 420. The first shutter support plate 400a and the second shutter support plate 400b are collectively referred to as a shutter support plate 400. The structure of the shutter support plate 400, the shutter 410, the rivet 520, the coupling rod 500, and the opening / closing operation of the shutter 410 will be described later.

[0013] 3(a)-(b) are cross-sectional views showing the structure of ventilation fan 1000. These are cross-sectional views taken along line A-A' in FIGS. 1(a) and 1(c). FIG. 3(a) shows a state in which the shutter 410 is closed. A belt-shaped shutter support plate 400 is provided in the vicinity of the leeward opening 104 inside the frame 100 in the vertical direction. On the shutter support plate 400, first to third support shafts 412a to 412c are arranged in order from the bottom to the top. Further, in the leeward opening 104, first shutters 410a to third shutters 410c for preventing outside air from flowing in are arranged in order from the bottom to the top. The arm portions at both ends of the first shutter 410a are connected to the first support shaft 412a, so that the first support shaft 412a rotatably supports the first shutter 410a. Further, the second support shaft 412b rotatably supports the second shutter 410b, and the third support shaft 412c rotatably supports the third shutter 410c.

[0014] The coupling rod 500 has a first piece 510 that extends in the vertical direction inside the frame 100, and a second piece 512 that extends upwind from the lower end portion of the first piece 510. The first piece 510 and the second piece 512 are connected at a bent portion 514, and the first piece 510 and the second piece 512 are integrally manufactured as one piece.

[0015] The first piece 510 is vertically movably connected to the arm portion of the first shutter 410a via a first rivet 520a. Further, the first piece 510 is vertically movably connected to the arm portion of the second shutter 410b via a second rivet 520b. Further, the first piece 510 is vertically movably connected to the arm portion of the third shutter 410c via a third rivet 520c. The first rivet 520a to the third rivet 520c are collectively referred to as rivets 520.

[0016] The second piece 512 extends between the bent portion 514 on the leeward side and the front end portion 542 on the windward side. Front end portion 542 is connected to switch 420. Switch 420 moves front end portion 542 of second piece 512 of coupling rod 500 in the vertical direction. In the state shown in FIG. 3(a), the power to the ventilation fan 1000 is turned off and the motor 220 is stopped.

[0017] FIG. 3(b) shows a state in which the shutter 410 is open. When the switch 420 in FIG. 3(a) is pulled downward, the second piece 512 moves downward. As the second piece 512 moves, the first piece 510 is also pulled downward. Each shutter 410 is rotated about the support shaft 412 to be opened and held. Further, in the state shown in FIG. 3(b), the ventilation fan 1000 is powered on and the motor 220 operates. As a result, impeller 200 rotates.

[0018] (2) Impeller structure 4(a)-(b) show the structure of the impeller 200. FIG. 4(a) shows a plan view of the impeller 200 when viewed from the windward side, and FIG. 4(b) shows a perspective view of the impeller 200 when viewed from the windward side. A cylindrical boss portion 230 is arranged at the center of the impeller 200, and a plurality of blades 240 are fixed to the outer periphery of the boss portion 230. Here, the number of wings 240 is "5", but the number of wings 240 is not limited to "5". In the wing 240, the boss portion 230 side is the inner periphery, and the side opposite to the inner periphery is the outer periphery. Therefore, in the blade 240, the edge connected to the boss portion 230, that is, the edge on the inner circumferential side is the inner circumferential edge 250, and the edge on the outer circumferential side is the outer circumferential edge 252. When the impeller 200 is rotatable in the rotation direction shown in FIG. 5(c), the edge of the blade 240 on the rotation direction side is the leading edge 260, and the edge opposite to the leading edge 260 is the trailing edge 262. .

[0019] 5(a)-(c) show the structure of the impeller 200. FIG. FIG. 5(a) is a side view of the impeller 200, with the upper side corresponding to the windward side and the lower side corresponding to the leeward side. In blade 240 in impeller 200 , leading edge 260 is positioned on the windward side of trailing edge 262 . FIG. 5(b) is a cross-sectional view of one blade 240 in FIG. 5(a). FIG. 5(b) shows an arc shape 270 extending from the inner peripheral edge 250 to the outer peripheral edge 252. FIG. Specifically, the arc shape 270 protrudes from the inner peripheral edge 250 toward the windward side and then reaches the outer peripheral edge 252 toward the leeward side. Such an arc shape 270 is a typical wing shape.

[0020] On the other hand, the blade 240 according to the present embodiment protrudes from the inner peripheral edge 250 toward the windward side when advancing from the inner peripheral edge 250 toward the outer peripheral edge 252 and starts sinking toward the leeward side at the start position 280 . Also, the wing 240 continues to squat downwind from the start position 280 to the maximum squat position 282, and from the maximum squat position 282 begins to return toward the windward side. Further, wing 240 returns upwind to end position 284 and from end position 284 downwind to perimeter edge 252 . That is, the wing 240 is partially lowered downwind between the starting position 280 and the ending position 284 . Therefore, the starting position 280 is the position at which subsidence toward the leeward side begins, the maximum subsidence position 282 is the position at which the amount of subsidence becomes maximum, and the end position 284 is the position at which the subsidence toward the leeward side ends. position. Here, the area between the inner peripheral edge 250 and the start position 280 and the area between the end position 284 and the outer peripheral edge 252 are similar to the arc shape 270 .

[0021] FIG. 5(c) shows a plan view of a portion of the impeller 200 as viewed from the leeward side. Between the inner peripheral edge 250 and the outer peripheral edge 252 of the blade 240, there is a curve along the starting position 280 (hereinafter also referred to as the "starting position 280") from the leading edge 260 to the trailing edge 262, and a maximum A curve along the subsidence position 282 (hereinafter also referred to as "maximum subsidence position 282") and a curve along the end position 284 (hereinafter also referred to as "end position 284") are arranged side by side. . The maximum subsidence position 282, where the subsidence amount is maximum, functions as a standing wall facing the leeward side, so that a first region 290 between the inner peripheral edge 250 and the end position 284 and a gap between the end position 284 and the outer peripheral edge 252 are formed. A second region 292 in between is formed. Therefore, the airflow is separated into the airflow flowing through the first region 290 and the airflow flowing through the second region 292 . By separating the airflow into two, the flow of one airflow becomes smooth. As a result, the air volume of the blade 240 as a whole increases.

[0022] FIG. 6 shows the size of the impeller 200. As shown in FIG. This shows a plan view of a portion of the impeller 200 as seen from the windward side. The length from the center of the boss portion 230 to the outer peripheral edge 252 is the blade diameter. Here, the blade diameter is assumed to be "1". The radius of the boss portion 230 is 0.25 to 0.4 and the length "A" from the center of the boss portion 230 to the starting position 280 is 0.49 to 0.55. Also, the length "B" from the center of the boss portion 230 to the end position 284 is 0.79 to 0.81, and the length from the center of the boss portion 230 to the maximum depression position 282 is 0.65 to 0.67.

[0023] 7(a)-(b) are cross-sectional views showing the structure of the impeller 200. FIG. 7(a) is a cross-sectional view of blade 240 in the vicinity of leading edge 260, and FIG. 7(b) is a cross-sectional view of blade 240 in the vicinity of trailing edge 262. FIG. The difference between the arc shape 270 and the maximum squat position 282 in FIG. 7(a) is greater than the difference between the arc shape 270 and the maximum squat position 282 in FIG. 7(b). That is, the amount of subsidence is smaller on the trailing edge 262 side of the blade 240 than on the leading edge 260 side of the blade 240 in the rotation direction of the impeller 200 . This will be explained below also using FIGS. 8(a)-(b).

[0024] 8(a)-(b) show the blade shape of the impeller 200. FIG. FIG. 8(a) is a plan view of a portion of the impeller 200 as viewed from the leeward side. Similar to FIG. It has a trailing edge 262 . Here, lines (i) to (v) connecting the inner peripheral edge 250 and the outer peripheral edge 252 are defined. Line (i) is closest to the trailing edge 262, line (v) is closest to the leading edge 260, and lines (ii) to (iv) are located therebetween. FIG. 8(b) shows arc shapes 270 and maximum squat positions 282 for lines (i) through (v), respectively. As shown, arc shape 270 and maximum squat position 282 are closest at line (i).

[0025] According to this embodiment, the blade 240 protrudes toward the windward side and partially sinks toward the leeward side, so that the airflow can be divided into two. In addition, since the airflow is divided into two, the air volume can be increased. In addition, since the amount of subsidence is smaller on the trailing edge 262 side of the blade 240 than on the leading edge 260 side, the two airflows can be pushed out together. In addition, the air flow divided into two is pushed out as one, so the air volume can be increased.

[0026] A summary of one aspect of the present disclosure is as follows. A ventilating fan (1000) according to one aspect of the present disclosure includes a box-shaped frame (100) that is open on the windward side and the leeward side, and a plurality of ventilators arranged inside the frame (100) around the perimeter of the boss (230). and an impeller (200) to which a blade (240) is fixed. The wing (240) protrudes toward the windward side and partially sinks toward the leeward side.

[0027] The wings (240) may have an inner peripheral edge (250) on the side of the boss (230) and an outer peripheral edge (252) opposite to the inner peripheral edge (250). When the wing (240) advances from the inner peripheral edge (250) toward the outer peripheral edge (252), if the position where the subsidence toward the leeward side starts is called the starting position (280), the subsidence toward the leeward side is The end position is called the end position (284), the radius of the boss (230) is 0.25 to 0.4 when the blade diameter is 1, and the distance from the center of the boss (230) to the start position (280) is The length is 0.49 to 0.55, the length from the center of the boss (230) to the end position (284) is 0.79 to 0.81, and the maximum settlement (282) is from the center of the boss (230). The length to may be 0.65 to 0.67.

[0028] The amount of subsidence is smaller on the trailing edge (262) side of the blade (240) than on the leading edge (260) side of the blade (240) in the rotational direction of the impeller (200).

[0029] The present disclosure has been described above based on the embodiments. It is to be understood by those skilled in the art that this embodiment is an example, and that various modifications are possible in the combination of each component or each treatment process, and such modifications are within the scope of the present disclosure. . [Description of symbols]

[0030] 100 frame, 102 windward opening, 104 leeward opening, 110 flange, 200 impeller, 210 spinner, 220 motor, 222 motor support, 230 boss, 240 blade, 250 inner peripheral edge, 252 outer peripheral edge, 260 leading edge, 262 trailing edge, 270 arc shape, 280 start position, 282 maximum subsidence position, 284 end position, 290 first area, 292 second area, 300 orifice, 310 aperture, 400 shutter support plate, 410 shutter, 412 support shaft, 420 switch , 500 coupling rod, 510 first piece, 512 second piece, 514 bend, 520 rivet, 1000 ventilation fan.

Claims

1. a box-shaped frame that is open on both the windward and leeward sides; an impeller disposed inside the frame and having a plurality of blades fixed to an outer periphery of a boss portion; The wing of the ventilation fan protrudes toward the windward side and partially sinks toward the leeward side.

2. the blade has an inner peripheral edge on the boss portion side and an outer peripheral edge opposite the inner peripheral edge, When the wing moves from the inner peripheral edge to the outer peripheral edge, the position where the sinking starts toward the downwind side is called the start position, and the position where the sinking ends toward the downwind side is called the end position, 2. The ventilation fan according to claim 1, wherein, when the blade diameter is 1, the radius of the boss portion is 0.25 to 0.4, the length from the center of the boss portion to the start position is 0.49 to 0.55, the length from the center of the boss portion to the end position is 0.79 to 0.81, and the length from the center of the boss portion to the position of maximum subsidence is 0.65 to 0.

67.

3. The ventilation fan according to claim 2 , wherein the amount of sinking is smaller on the trailing edge side of the blade than on the leading edge side of the blade in the rotation direction of the impeller.

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