JP4863696B2 - Ventilation equipment - Google Patents

Description

  The present invention relates to a ventilator arranged in a ceiling space or a side wall outer surface as a part of a building air conditioner.

  Conventionally, in a ventilator using a centrifugal fan, there has been a demand for a compact body with the main aim of making the device thinner, and in order to cope with this, a centrifugal fan and a suction path toward the suction port are provided. Technological developments such as improvement of the arrangement form and thinning of the centrifugal fan and the suction path have been carried out. In particular, in the case of a ventilator equipped with a suction channel that sucks in an air flow from the direction intersecting the rotation axis of the centrifugal fan, the device is made thinner for the suction port established in the fan casing of the centrifugal fan. In order to achieve this, it is effective to reduce the thickness of the suction path.

  On the other hand, if the outside air is taken directly into the air-conditioned room in a building with air conditioning equipment, hot air flows in the air-conditioned room in summer and cold in the heated room in winter. Air will flow, giving residents discomfort. Therefore, when taking in outside air, in order to bring the temperature close to the room temperature, the ventilator has a function of exchanging heat between the air flow discharged from the room to the outside and the air flow taken into the room from the outside. (Total heat exchange unit) has been proposed (see, for example, Patent Document 1).

  In the “heat exchange ventilator” described in Patent Document 1, an exhaust fan unit and an air supply fan unit are disposed on both sides of a heat exchange element provided at an intersection of an exhaust passage and an intake passage, The heat exchange element, the exhaust fan unit, and the air supply fan unit are detachable from the provided opening.

Japanese Patent Laid-Open No. 03-156235

  To reduce the thickness of a ventilator with a built-in centrifugal fan, it is a shortcut to narrow the suction path in the area facing the centrifugal fan (thinning), but if the suction path is made thinner, it will be closer to the fan inlet. The flow rate increases and a large amount of air flows into a part of the suction port located on the end side of the suction path, so that the air does not flow uniformly into the entire fan suction port, resulting in a decrease in fan efficiency. Resulting in. Therefore, in reality, it is impossible to reduce the thickness of the device to the extent that it can meet the demand while maintaining the fan efficiency required for the ventilation device.

  On the other hand, in the case of a ventilator that is placed in the ceiling space of a building as part of an air conditioning facility, the ceiling space that is the construction site is often narrow and is restricted by the space in the height direction. There is a demand for a thin ventilation device (for example, a total heat exchanger) that suppresses the above. Therefore, it is conceivable to suppress the height dimension of the suction flow path in the vicinity of the suction port of the centrifugal fan by disposing the large-diameter thin centrifugal fan horizontally. In this case, the suction port of the centrifugal fan has a structure that opens to the upper surface (or the lower surface), but the height of the flow path in the vicinity of the suction port is also limited, so that the flow velocity of the airflow flowing into the suction port increases. . For this reason, the air flow is not uniformly sucked into the suction port of the centrifugal fan, and the fan efficiency of the centrifugal fan may be reduced.

  Further, when a centrifugal fan, a motor, or the like breaks down and maintenance is necessary, there is a demand for a structure in which only necessary parts can be taken out from an inspection port provided on the lower surface of the main body. However, in the “heat exchanging ventilator” described in Patent Document 1, the fan motor and the foamed synthetic resin fan casing are integrated as a unit. The operation | work which removes a motor from a fan casing is needed. In addition, after the repair is completed, the motor must be assembled again in the fan casing and returned to the main body, which is troublesome. Furthermore, since the clearance between the fan casing outer shape and the main body is narrow, the assembling work is difficult.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a ventilator that can reduce the size of a device that is mainly designed to be thin without reducing the fan efficiency.

The ventilator of the present invention is a ventilator provided with a suction passage that communicates with a suction port established in a fan casing part containing a centrifugal fan and sucks an air flow from a direction intersecting with the rotation axis of the centrifugal fan. Protruding portions projecting toward the suction port are provided on at least a portion of the inner surface of the suction channel facing the suction port, and a part of the fan casing portion is formed as a detachable divided body, and the divided body A centrifugal fan take-out port is provided that opens when the fan is detached . With such a configuration, the air flow flowing in the suction flow path along the direction intersecting the rotation axis of the centrifugal fan collides with the protruding portion, and the collided air flow is spread over the entire suction port of the centrifugal fan. Therefore, even if the suction flow path is thinned, the fan efficiency does not decrease.

  If the suction flow path is made thin in a conventional ventilation device without a protrusion, the flow velocity of the air flow in the vicinity of the suction port increases.Therefore, there are a part that sucks in a large amount of air flow and a part that does not suck in the area of the suction port. As a result, there was a phenomenon that the air flow was not uniformly sucked into the entire suction port, but with the configuration of the present invention, the air flow is induced by colliding with the protruding portion, so that the conventional method sucks the air flow. As a result of being sucked into the part that was not present, the air flow is uniformly sucked into the entire suction port. Therefore, it is possible to reduce the size of the apparatus by reducing the thickness of the suction flow path without causing a decrease in fan efficiency.

  Here, if an airflow guide surface inclined toward the suction port is provided in a portion facing the suction port on the inner surface of the suction flow path, it does not collide with the protruding portion described above, and wraps around downstream. Since the air flow to be directed is guided toward the suction port of the centrifugal fan by the air flow guide surface, it is possible to suppress a decrease in fan efficiency.

  Further, if an airflow guide for collecting airflow is provided in the area facing the suction port in the suction flow path, the airflow flowing along the suction flow path is a centrifugal fan by the function of the airflow guide. Therefore, the air flows smoothly into the suction port, and the fan efficiency can be prevented from being lowered.

  On the other hand, if a convex surface portion is provided in at least a part of the region where the airflow flowing in toward the facing portion of the suction port contacts in the protruding portion, the air flowing in toward the facing portion of the suction port of the centrifugal fan Since the flow collides with the convex surface portion and the collided air flow is guided to the entire suction port of the centrifugal fan, the above-described effect of suppressing the decrease in fan efficiency associated with the thin fan of the suction flow path is further improved. Can be improved.

  Here, if the shape of the protruding portion viewed from the suction port is one of an oval, a circular shape, a polygonal shape, a half moon shape, a crescent shape, and a curved plate shape, the protruding portion has a portion facing the suction port. A projecting portion having an excellent flow rate relaxation effect can be disposed in a region where a relatively large amount of air flowing inward is in contact. Further, if the shape of the projecting portion is such a shape, at least a part of the projecting portion can be shaped along the arc portion of the suction port that is generally circular, Airflow is uniformly sucked from the surroundings.

  In this case, it is desirable that the shape of the protruding portion be tapered from the base end portion toward the tip end portion. With such a configuration, the air flow that flows in toward the opposite portion of the suction port comes into contact with the protruding portion, the flow velocity is relaxed, and the suction of the centrifugal fan is performed while flowing from the base end portion along the tip portion. Since it comes into the mouth, fan efficiency can be improved.

  In addition, if the shape of the airflow guide as seen from the suction port is a curved shape that smoothly contracts from the upstream side to the downstream side of the suction channel, the air flow that has flowed along the suction channel Since the airflow guide is guided toward the projecting portion and the airflow guide surface, it is effective in improving the fan efficiency.

  Furthermore, if at least one of the airflow guide surface and the airflow guide and the projecting portion are integrally formed, the manufacturing process of the ventilation device can be simplified.

Further, the ventilator of the present invention, the fan forms part of the casing a detachable divided body, since Ru said when disengaging the divided body is provided a centrifugal fan outlet which opens Tei, relatively small centrifugal Since the centrifugal fan can be taken out by providing the fan outlet, the workability during maintenance is improved. Such an effect is particularly noticeable in a total heat exchanger having a structure in which a fan casing portion incorporating a centrifugal fan is accommodated in a box-shaped main body casing having a maintenance opening on the bottom surface.

  According to the present invention, it is possible to reduce the size of the apparatus mainly for thinning without lowering the fan efficiency.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view showing a ventilator according to an embodiment of the present invention as viewed from the lower surface side, FIG. 2 is a side view of the ventilator shown in FIG. 1, and FIG. 3 is a bottom view of the ventilator shown in FIG. 4 is a view showing a state in which the bottom portion of the main casing and the centrifugal fan are removed from the ventilation device shown in FIG. 1, and FIG. 5 is a cross-sectional view taken along the line AA of FIG.

  As shown in FIGS. 1 to 5, the ventilator 10 of the present embodiment includes a rectangular parallelepiped main body casing 15, a main body unit 16 accommodated in the main body casing 15, and two units disposed in the main body unit 16. Two centrifugal fan units 11, 12 and a heat exchange element 17 detachably disposed in a storage portion 27 between the centrifugal fan units 11, 12 are provided. A plurality of indoor-side discharge ports 18 and indoor-side suction ports 19 are provided on one end surface of the main casing 15, and an outdoor-side discharge port 20 and an outdoor-side suction port 21 are provided on the other end surface. Further, on the other end face of the main body casing 15, a hook portion 23 for projecting a suspension fitting 22 that suspends and holds the ventilation device 10 is provided.

  Furthermore, an opening 15a (see FIG. 5) for exchanging and maintaining the heat exchange element 17 is opened at the center of the bottom surface of the main casing 15, and a lid 24 that can be opened and closed is attached to the opening 15a. Has been. Specifically, as shown in FIG. 1, the center portion of the bottom surface of the main body casing 15 is constituted by an auxiliary bottom plate 15b fixed by a plurality of screws 15c, and a lid 24 is provided in an opening portion 15a opened in the auxiliary bottom plate 15b. Is attached by a screw 24a so as to be opened and closed.

  The main body casing 15 is a box-shaped member constituting the outer shape of the ventilation device 10, and the main body unit 16 is a foamed synthetic resin member disposed in the main body casing 15, and defines a space in the main body casing 15. Thus, suction passages 13a and 14a, which will be described later, are formed. Centrifugal fan units 11 and 12 are members in which centrifugal fans 11a and 12a and motors 11b and 12b that rotationally drive the centrifugal fans 11a and 12a are integrated. The centrifugal fan units 11 and 12 have the same structure and function, but are hereinafter referred to as an air supply fan unit 11 and an exhaust fan unit 12.

  The air supply fan unit 11 and the exhaust fan unit 12 include centrifugal fans 11a and 12a and motors 11b and 12b for rotationally driving these, respectively, and are horizontally disposed in fan casing portions 13 and 14 provided in the main unit 16. ing. Each of the fan casing portions 13 and 14 has suction ports 13b and 14b opened at positions facing the centrifugal fans 11a and 12a and suction ports 13b and 14b in order to suck the air flow toward the centrifugal fans 11a and 12a. The suction flow paths 13a and 14c for discharging the sucked air flow, and the suction flow paths 13a that communicate with the suction ports 13b and 14b, respectively, and suck the air flow from the direction orthogonal to the rotation shafts 11c and 12c of the centrifugal fans 11a and 12a. , 14a.

  Due to the operation of the air supply fan unit 11, the air sucked from the outdoor air inlet 21 flows into the air supply passage 25 on the side of the fan casing portion 14, passes through the heat exchange element 17, and then enters the suction passage 13 a. It flows in, passes through here, is sucked into the suction port 13b, discharged to the discharge flow path 13c, and then discharged from each of the plurality of indoor side discharge ports 18 to each room via a duct (not shown). The

  In addition, due to the operation of the exhaust fan unit 12, the air sucked from the indoor side suction port 19 flows into the exhaust passage 26 on the side of the fan casing 13, passes through the heat exchange element 17, and then enters the suction passage 14 a. It flows in, passes through here, is sucked into the suction port 14b, discharged to the discharge channel 14c, and then discharged from the outdoor discharge port 20 toward the outside.

  In this way, by operating the air supply fan unit 11 and the exhaust fan unit 12 of the ventilation device 10, two ventilation actions of exhausting the indoor air to the outside and introducing the outdoor air into the room can be obtained. Further, since the indoor air and the outdoor air exchange heat with each other when passing through the heat exchange element 17, the indoor air conditioning efficiency is not lowered.

  Next, the structure and function of the fan casing portions 13 and 14 will be described in detail with reference to FIGS. 6 is a partially omitted sectional view taken along line BB in FIG. 2, FIG. 7 is a partially cutaway perspective view of the main unit shown in FIG. 4, and FIG. 8 is a partially enlarged view of FIG. In addition, since the vicinity of the suction inlet of the fan casing parts 13 and 14 is substantially the same structure, the fan casing part 14 will be described below.

  As shown in FIGS. 6-8, in the inner surface of the suction flow path 14a, in a portion facing the suction port 14b of the fan casing portion 14, a protruding portion 28 projecting toward the suction port 14b and toward the suction port 14b. An inclined airflow guiding surface 29 is provided. In addition, an airflow guide 30 is provided for collecting the airflow in a region facing the suction port 14b. The protrusion 28, the airflow guiding surface 29, and the airflow guiding guide 30 are integrally formed with the suction flow path 14a located at a portion facing the suction port 14b.

  As shown in FIG. 6, due to the operation of the exhaust fan unit 12, the airflow flowing along the suction flow path 14 a is collected in a region facing the suction port 14 b of the centrifugal fan 12 a by the action of the airflow guide 30. Thus, the air can smoothly flow into the suction port 14b, and a decrease in fan efficiency can be suppressed.

  In addition, the air flow that has flowed through the suction flow path 14a along the direction intersecting the rotary shaft 12c of the centrifugal fan 12a collides with the front surface of the projecting portion 28, and the collided air flow is the suction port 14b of the centrifugal fan 12a. Therefore, even if the suction flow path 14a is thinned, the fan efficiency does not decrease. Accordingly, the ventilation device 10 as a whole can be made compact by reducing the thickness of the suction channel 14a. Furthermore, in this embodiment, since the front surface of the projecting portion 28, which is a region where the airflow flowing toward the facing portion of the suction port 14b abuts, is a convex surface portion 28a, the inflow flows toward the facing portion of the suction port 14b. The air flow is brought into contact with the convex surface portion 28a, the flow velocity is relaxed, and the air flows into the suction port 14b of the centrifugal fan 12a, so that the fan efficiency can be improved. Such an effect is obtained in the ventilator 10 having a structure in which the inflow direction of the air flow in the suction flow path 14a and the outflow direction of the air flow in the discharge flow path 14c are substantially parallel as in the present embodiment. It is remarkable.

  Furthermore, since the airflow guide surface 29 is provided in a portion facing the suction port 14b in the suction flow path 14a, the airflow guide surface 29 does not collide with the protruding portion 28 described above and tries to go around to the downstream side. The air flow is guided by the air flow guide surface 29 toward the suction port 14b of the centrifugal fan 12a, and is uniformly sucked from the suction port 14b, so that a decrease in fan efficiency can be suppressed.

  In the present embodiment, the shape of the projecting portion 28 viewed from the suction port 14b is an ellipse and is tapered from the proximal end portion toward the distal end portion, so that it flows toward the opposite portion of the suction port 14b. The air flow is brought into contact with the elliptical projecting portion 28 to reduce the flow velocity, and flows from the proximal end portion to the suction port 14b of the centrifugal fan 12a while flowing along the distal end portion. It is effective for improving efficiency. In the present embodiment, the entire shape of the projecting portion 28 is formed into a substantially elliptic frustum shape by providing the flat portion 28b substantially parallel to the suction port 14b at the top portion of the projecting portion 28. However, the present invention is not limited to this. Not what you want.

  On the other hand, since the shape of the airflow guide 30 is a substantially parabolic shape that smoothly contracts from the upstream side to the downstream side of the suction flow path 14a, the air flow that has flowed along the suction flow path 14a is used as the airflow guide. 30 can be guided toward the projecting portion 28 and the airflow guiding surface 29. For this reason, it is effective in suppressing a decrease in fan efficiency. In the present embodiment, since the airflow guide surface 29, the airflow guide 30 and the protrusion 28 are formed integrally with the main unit 16, the manufacturing process of the ventilation device 10 can be simplified.

  Next, with reference to FIG. 9, FIG. 10, the attachment or detachment method of the heat exchange element 17 in the ventilation apparatus 10, a maintenance, etc. are demonstrated. 9 is a partially exploded perspective view of the ventilator shown in FIG. 1, and FIG. 10 is a partially exploded sectional view of the ventilator shown in FIG.

  When it is desired to take out the heat exchange element 17 for the purpose of maintenance or parts replacement, the procedure shown in FIG. 9 is performed. That is, when the screw 24a on the bottom surface of the main body casing 15 of the ventilator 10 is loosened and the lid 24 is removed, the opening 15a (see FIG. 5) appears, so if the two shielding plates 32 are taken out from the opening 15a. Similarly, the heat exchange element 17 can be taken out through the opening 15a. Moreover, what is necessary is just to take the procedure contrary to the above, when attaching the heat exchange element 17. FIG. Therefore, the attachment / detachment work of the heat exchange element 17 is easy.

  On the other hand, when it is desired to take out the air supply fan unit 11 disposed in the main body casing 15, the procedure shown in FIG. 10 is performed. First, as shown in FIG. 1, when the plurality of screws 15 c on the bottom surface of the main body casing 15 are loosened, the auxiliary bottom plate 15 b can be detached together with the lid 24. An opening 15d having an opening area wider than 15a appears. Therefore, the two shielding plates and the heat exchange element 17 can be taken out from the opening 15d as described above.

  Then, after the heat exchange element 17 is taken out, the detachable divided body 13d constituting the fan casing part 13 is moved toward the storage part 27 and taken out from the opening part 15d. Can be slid to a position facing the opening 15d and taken out through the opening 15d. Similarly, if the removable divided body 14d constituting the fan casing part 14 is moved toward the storage part 27 and taken out from the opening 15a, the exhaust fan unit 12 is slid to the position facing the opening 15d and taken out. Can do.

  In this way, if the plurality of screws 15c on the bottom surface of the main body casing 15 are loosened, the auxiliary bottom plate 15b is removed and the opening 15d is opened, not only the heat exchange element 17 but also the air supply fan unit 11 and the exhaust fan through the opening 15d. Since the unit 12 can be taken out, disassembly when the centrifugal fans 11a and 12a, the motors 11b and 12b, etc. constituting the air supply fan unit 11 and the exhaust fan unit 12 break down or maintenance is required. Work is easy and maintenance is excellent.

  The ventilator of the present invention can be widely used as a part of an air conditioner or a ventilator installed in a building.

It is a perspective view which shows the ventilation apparatus which is embodiment of this invention in the state seen from the lower surface side. It is a side view of the ventilation apparatus shown in FIG. It is a bottom view of the ventilator shown in FIG. It is a figure which shows the state which removed the main body casing bottom face part, the centrifugal fan, etc. from the ventilation apparatus shown in FIG. It is sectional drawing in the AA of FIG. FIG. 3 is a partially omitted sectional view taken along line BB in FIG. 2. FIG. 5 is a partially cutaway perspective view of the main unit shown in FIG. 4. FIG. 6 is a partially enlarged view of FIG. 5. It is a partially exploded perspective view of the ventilation apparatus shown in FIG. It is a partially exploded sectional view of the ventilator shown in FIG.

Explanation of symbols

10 Ventilator 11 Air supply fan unit (centrifugal fan unit)
12 Exhaust fan unit (centrifugal fan unit)
11a, 12a Centrifugal fan 11b, 12b Motor 11c, 12c Rotating shaft 13, 14 Fan casing part 13a, 14a Suction passage 13b, 14b Suction port 13c, 14c Discharge passage 13d, 14d Divider 15 Main body casing 15a, 15d Opening 15b Auxiliary bottom plate 15c, 24a Screw 16 Main unit 17 Heat exchange element 18 Indoor side outlet 19 Indoor side inlet 20 Outdoor side outlet 21 Outdoor side inlet 22 Hanging bracket 23 Hook part 24 Lid 25 Air supply channel 26 Exhaust channel 27 Storage part 28 Projection part 28a Convex part 28b Plane part 29 Airflow guidance surface 30 Airflow guidance guide 32 Shielding plate

Claims (8)

A ventilating apparatus comprising a suction channel that communicates with a suction port established in a fan casing portion containing a centrifugal fan and sucks an air flow from a direction intersecting a rotation axis of the centrifugal fan, and at least an inner surface of the suction channel A portion that faces the suction port is provided with a protruding portion that protrudes toward the suction port, and a part of the fan casing part is formed as a detachable divided body, and a centrifuge that opens when the divided body is detached. A ventilator characterized by providing a fan outlet .   The ventilator according to claim 1, wherein an airflow guide surface inclined toward the suction port is provided in a portion of the suction channel inner surface facing the suction port.   The ventilator according to claim 1 or 2, wherein an airflow guide for collecting an airflow in a region facing the suction port is provided in the suction flow path.   The ventilator according to any one of claims 1 to 3, wherein a convex surface portion is provided in at least a part of a region where the airflow flowing in toward the opposite portion of the suction port contacts in the protruding portion.   The ventilator according to any one of claims 1 to 4, wherein the shape of the protruding portion viewed from the suction port is any one of an ellipse, a circle, a polygon, a half moon, a crescent, and a curved plate.   The ventilator according to claim 5, wherein the shape of the projecting portion is tapered from the proximal end portion toward the distal end portion.   The ventilator according to any one of claims 3 to 6, wherein the shape of the airflow guiding guide viewed from the suction port is a curved shape that smoothly contracts from the upstream side to the downstream side of the suction channel.   The ventilator according to any one of claims 1 to 7, wherein at least one of the air flow guide surface and the air flow guide and the protruding portion are integrally formed.

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