JP6091386B2 - Blower and refrigeration cycle apparatus - Google Patents

Description

  The present invention relates to a blower used for an air conditioner, for example. In particular, the present invention relates to a bell mouth that rectifies air flowing into a fan.

  A blower rotates a fan, for example, forms the flow of the air which let the air suck | inhaled in the blower pass through a fan and blows out of a blower. Conventionally, there is a blower having a bell mouth and rectifies the air sent to the fan via the bell mouth. The bell mouth has a portion formed in an annular shape (cylindrical shape) in accordance with, for example, a rotating fan. In the cross section, the annular portion is curved, and the diameter of the curved portion once narrows (becomes smaller) from the inflow side to the outflow side of the bell mouth, and then increases again (becomes larger). (E.g., see Patent Document 1 and Patent Document 2).

Japanese Patent Laying-Open No. 2009-024595 (FIG. 4) JP 2001-124360 A (FIG. 2)

  For example, in the blower of Patent Document 1, air that has passed through the upper and lower suction ports is sent to the fan via the flat plate portion and the curved portion of the bell mouth. Therefore, for a blower having a structure that sucks air from the rotation axis direction of the fan and sends the air to the fan via the curved portion of the bell mouth, such as a four-way cassette type air conditioner (indoor unit), It is not possible to obtain sufficient effects for performance improvement and noise prevention.

  Moreover, since the air blower of patent document 2 is a structure which can provide an uneven | corrugated shape only in the entrance side of a bellmouth curved part, only the air before entering into a curved part can be rectified.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to obtain a blower or the like that can enhance the rectification effect and prevent noise.

The blower according to the present invention includes a fan that rotates around a rotation shaft to generate a gas flow, and an annular wall surface that is formed in accordance with the diameter of the fan. And the opening portion on the gas outflow side which is the downstream side is curved, and the diameter of the opening portion in the intermediate portion between the end on the gas inflow side and the end on the gas outflow side is the same as the opening portion on the gas inflow side and the gas outflow side. The bell mouth has a curved portion smaller than the diameter of the opening portion and rectifies the gas flowing into the fan, and the bell mouth is annularly formed from the gas inlet side to the outlet side of the inner surface of the curved portion. In the respective portions in the circumferential direction of the outer surface of the bell mouth corresponding to the portion where the uneven shape portion is formed, the diameter from the center of the opening portion is the same.

  In the blower according to the present invention, since the concave and convex portion is formed on the inner side of the curved portion of the bell mouth, noise suppression and rectification by the pressure difference between the air passing through the concave portion and the air passing through the convex portion It is possible to increase the performance due to.

It is a figure explaining the air blower concerning Embodiment 1 of this invention. It is a perspective view of bell mouth 6 in Embodiment 1 of the present invention. 4 is a cross-sectional view of a main part of the bell mouth according to Embodiment 1. FIG. It is a figure showing the structural example of the refrigerating-cycle apparatus which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram illustrating a blower according to Embodiment 1 of the present invention. In this embodiment, as shown in FIG. 1 and the like, a blower included in a four-way cassette type air conditioner (indoor unit) disposed in a room (a space to be air-conditioned) will be described. Here, the upper side (vertical direction) in FIG. 1 will be described as the upper side, and the lower side will be described as the lower side. For example, the air conditioner of the present embodiment is connected to an outdoor unit through a refrigerant pipe, and constitutes a refrigerant circuit that circulates the refrigerant and performs refrigeration, air conditioning, and the like.

  As shown in FIG. 1, the air conditioner according to the present embodiment is installed in a direction in which the top plate is upward with respect to the room. The housing 1 opens toward the room. Below the casing 1, a decorative panel 2 having a size that covers the casing 1 and having a substantially square shape in plan view is attached and faces the room. In the vicinity of the center of the decorative panel 2, a suction grill 3 serving as a gas (air) suction port into the air conditioner is provided. In some cases, it has a filter (not shown) for removing dust after passing through the suction grill 3. A panel outlet 7 serving as an air outlet is formed along each side of the decorative panel 2 on each side of the decorative panel 2. Each panel outlet 7 has a wind direction vane 7a.

  The casing 1 has a turbo fan 8 and a heat exchanger 10 inside. The turbofan 8 includes a fan (blade) 4, a fan motor 5, and a bell mouth 6. The turbo fan 8 is, for example, a centrifugal blower in which a rotation shaft is arranged in the vertical direction. The fan 4 generates an air current by rotation. Although it does not specifically limit, the fan 4 of this Embodiment shall have a three-dimensional wing | blade. The fan motor 5 rotates the fan 4. The bell mouth 6 forms a suction air passage for the turbo fan 8 and rectifies it. The bell mouth 6 will be described later. Then, the turbo fan 8 drives the fan motor 5 to rotate the fan 4, and the indoor air sucked through the suction grille 3 accompanying the rotation is lateral to the air conditioner (left and right direction in FIG. 1). Creates a flow of air to be sent out.

  The heat exchanger 10 is installed on the downstream side of the turbo fan 8 in the air flow so as to surround the turbo fan 8. For example, in the case of an air conditioner as in this embodiment, the heat exchanger 10 functions as an evaporator during cooling operation and functions as a condenser during heating operation.

  FIG. 2 is a perspective view of the bell mouth 6 in the first embodiment of the present invention. In FIG. 2, it is the figure which looked at the indoor side at the time of installation, and was seen from the lower side (therefore, it is upside down from FIG. 1). As described above, the bell mouth 6 is disposed on the lower side of the fan 4 in order to rectify and guide the indoor air sucked by the rotation of the fan 4 to the fan 4. The bell mouth 6 of the present embodiment is a molded product made of synthetic resin. Here, as shown in FIG. 2, the bell mouth 6 in the present embodiment has a recessed portion 9 for attaching an electrical component (not shown), and a predetermined region around the opening 6 c of the bell mouth 6. Is formed.

  As shown in FIGS. 1 and 2, the bell mouth 6 of the present embodiment has a substantially square flat plate portion formed in accordance with the shape of the suction grill 3 that serves as a gas (air) suction port in an air conditioner. Have. In addition, the central portion of the substantially square flat plate portion has a space (through hole) on the inside and a curved portion formed in an annular shape (cylindrical shape) in accordance with the rotating fan 4 (turbo fan 8). doing. In the curved portion, the diameter of the ring (cylinder) in the space of the opening 6c is not uniform, and the diameter of the intermediate portion is the smallest. For this reason, the shape in the cross section (henceforth a cross section) which cut | disconnected the bellmouth in the rotating shaft direction is curved. Here, in the bell mouth 6 of the present embodiment, the curved portion has a shape like a hyperbolic rotating body, and the entire cross section has an arc shape (curve). For example, the diameter is the smallest. A straight line may be included in a part of the cross section, such as a straight pipe.

  One end portion (air inflow side end portion) of the curved portion is formed continuously so as to change substantially continuously from the flat plate portion. For this reason, as shown in FIG. 1 and FIG. 3A to be described later, when the cross section of the air inflow side terminal portion is viewed from the flat plate portion, the corner portion is not attached, and the shape is substantially circular. The other end portion (air outflow side end portion) of the curved portion is on the fan 4 side (upper side in FIG. 1; a direction perpendicular to the flat plate portion (this direction may not be strictly vertical)) Protruding. And the part enclosed by the air outflow side termination | terminus part is opened as the opening part 6c mentioned above, and the indoor air inhaled by the air conditioner passes toward the fan 4. FIG. The surface through which room air passes is defined as the inner surface, and the rear surface is defined as the outer surface.

  On the inner side surface of the curved portion of the bell mouth 6, the diameter of the space formed in an annular shape is narrowed (gradually decreased) from the air inflow side terminal portion to the intermediate portion. On the other hand, from the intermediate part to the air outflow side terminal part, a flared shape (tapered shape) is formed in which the diameter of the space formed in an annular shape widens (increases gradually).

  FIG. 3 is a cross-sectional view of a main part of the bell mouth according to the first embodiment. Fig.3 (a) is a figure which shows the cross section concerning the bellmouth which concerns on this Embodiment. FIG. 3B is a view showing a cross section of a conventional bell mouth. As shown in FIGS. 1, 2 and 3A, in the bell mouth 6 of the present embodiment, the inner side surface side of the flat plate portion is defined as an inner plane portion 6a, and the outer surface side is defined as an outer plane portion 6d. Further, a part of the inner side surface of the curved portion including the air inflow side terminal portion is defined as an inflow inner curved portion 6b, and an outer surface side is defined as an inflow outer curved portion 6e. Then, the inner surface side of the remaining portion of the curved portion including the air outflow side termination portion is defined as an uneven shape portion 6h, and the outer surface side is defined as an annular flat surface portion 6f.

  As described above, the diameter of the annularly formed space is narrowed from the air inflow side end portion side to the intermediate portion, and the diameter is widened from the intermediate portion to the air outflow side end portion. For this reason, as shown to Fig.3 (a), in the uneven | corrugated shaped part 6h, it curves from the air inlet side to the air outflow side. On the other hand, the annular flat surface portion 6f that is a part of the outer surface does not change in diameter from the center of the opening 6c. For this reason, a part of the resin between the annular flat surface portion 6f and the uneven shape portion 6h becomes thick (the thickness is different). This portion is referred to as a thick portion 6g.

  Here, the concavo-convex shape portion 6h is formed at substantially constant intervals over the entire region of the thick portion 6g. For example, the air sucked into the air conditioner passes through the inflow inner curved portion 6b and the uneven shape portion 6h on the inner surface side of the curved portion. At this time, in the concavo-convex shape portion 6h, the speed of air passing through the concave portion is different from the speed of air passing through the convex portion, and the pressure of air passing through the three-dimensional blade of the fan 4 changes. This pressure difference can prevent noise and improve rectification performance.

  Here, for example, when configured like the conventional bell mouth shown in FIG. 3 (b), the bell mouth (molded product) and the molding die are intricately structured. The molded product of bellmouth cannot be released. For this reason, it molds with six molds for upper and lower, front and rear, and right and left.

  Therefore, in the bell mouth 6 of the present embodiment, as shown in FIG. 3A, a part of the outer side surface of the curved portion of the bell mouth 6 is an annular flat portion 6f, so that the bell mouth 6 (molded) is formed. Product) and the mold for molding should not be intricately structured. Even with a simple mold structure, the molded product can be easily released, and can be molded with two upper and lower molds. Moreover, the high cost resulting from complication of the mold structure can be prevented. It also leads to a reduction in the space used by the molding equipment.

  And the uneven | corrugated shaped part 6h can prevent the sink mark which arises at the time of shaping | molding in the thick part 6g by having an unevenness | corrugation. Further, even if a sink mark is partially generated, it is possible to prevent the bell mouth 6 from being distorted due to the sink. The width, interval, and the like of the concavo-convex shape portion 6h may be appropriately selected as long as a good air flow and a quiet blowing sound can be realized in a well-balanced manner, as described above, in the specific product design.

  As mentioned above, according to the air blower of Embodiment 1, since the uneven | corrugated shaped part 6h is formed in the inner surface side of the curved part of the bellmouth 6, the air which passes a recessed part and the air which passes a convex part Noise suppression due to the pressure difference between the two and the performance increase due to rectification can be achieved. Further, since the curved portion has the thick portion 6g and the concave and convex portion 6h is formed on the inner side surface, it is possible to prevent sink marks when the resin bell mouth 6 is molded. . Since the molded bell mouth 6 is not distorted, the bell mouth 6 with good shape accuracy can be manufactured.

  Furthermore, since the outer surface of the curved portion of the bell mouth 6 is a flat surface, it can be easily integrally formed with a simple mold structure. For this reason, the problem of the high cost resulting from a complicated metal mold | die shape, part division | segmentation, etc. can be avoided. Moreover, since resin molding is possible, the cost of manufacturing a bell mouth can be suppressed.

Embodiment 2. FIG.
FIG. 4 is a diagram illustrating a configuration example of a refrigeration cycle apparatus according to Embodiment 2 of the present invention. Here, FIG. 4 shows an air conditioner having the air conditioner (indoor unit) described in Embodiment 1 as the refrigeration cycle apparatus. The air conditioner of FIG. 4 includes an outdoor unit (outdoor unit) 30 and the air conditioner (indoor unit, indoor unit) 20 described in the first and second embodiments as a gas refrigerant pipe 40 and a liquid refrigerant pipe. 50 is connected to the pipe. The outdoor unit 30 includes a compressor 31, a four-way valve 32, an outdoor heat exchanger 33, and an expansion valve 34.

  The compressor 31 compresses and discharges the sucked refrigerant. Here, although not particularly limited, the compressor 31 changes the capacity of the compressor 31 (the amount of refrigerant sent out per unit time) by arbitrarily changing the operating frequency, for example, by an inverter circuit or the like. You may be able to do that. The four-way valve 32 is, for example, a valve for switching the refrigerant flow between the cooling operation and the heating operation.

  The outdoor heat exchanger 33 performs heat exchange between the refrigerant and air (outdoor air). For example, it functions as an evaporator during heating operation, evaporating and evaporating the refrigerant. Moreover, it functions as a condenser during the cooling operation, and condenses and liquefies the refrigerant.

  The expansion valve 34 such as a throttle device (flow rate control means) expands the refrigerant by decompressing it. For example, in the case of an electronic expansion valve or the like, the opening degree is adjusted based on an instruction from a control means (not shown).

  The indoor heat exchanger 21 (the heat exchanger 10 described in Embodiment 1) included in the air conditioner 20 performs heat exchange between, for example, air in the indoor space and the refrigerant. During heating operation, it functions as a condenser and condenses and liquefies the refrigerant. Moreover, it functions as an evaporator during cooling operation, evaporating and evaporating the refrigerant. Moreover, the air conditioner 20 of this Embodiment is mounting the air blower which has the bellmouth 6 demonstrated in Embodiment 1. FIG.

  First, the cooling operation in the refrigeration cycle apparatus will be described based on the refrigerant flow. In the cooling operation, the four-way valve 32 is switched so as to have a connection relationship indicated by a solid line. The high-temperature and high-pressure gas refrigerant compressed and discharged by the compressor 31 passes through the four-way valve 32 and flows into the outdoor heat exchanger 33. The refrigerant (liquid refrigerant) condensed and liquefied by passing through the outdoor heat exchanger 33 and exchanging heat with outdoor air flows into the expansion valve 34. The refrigerant that has been decompressed by the expansion valve 34 and is in a gas-liquid two-phase state flows out of the outdoor unit 30.

  The gas-liquid two-phase refrigerant that has flowed out of the outdoor unit 30 passes through the liquid refrigerant pipe 50, flows into the air conditioner 20, and passes through the indoor heat exchanger 21. Then, the refrigerant (gas refrigerant) evaporated and gasified by exchanging heat with the indoor air sent by the blower 22 flows out of the air conditioner 20.

  The gas refrigerant flowing out from the air conditioner 20 passes through the gas refrigerant pipe 40 and flows into the outdoor unit 30. Then, it passes through the four-way valve 32 and is sucked into the compressor 31 again. As described above, the refrigerant of the air conditioner circulates and performs air conditioning (cooling).

  Next, the heating operation will be described based on the refrigerant flow. In the heating operation, the four-way valve 32 is switched so as to have a connection relationship indicated by a dotted line. The high-temperature and high-pressure gas refrigerant compressed and discharged by the compressor 31 passes through the four-way valve 32 and flows out of the outdoor unit 30. The gas refrigerant that has flowed out of the outdoor unit 30 passes through the gas refrigerant pipe 40 and flows into the air conditioner 20. And while passing through the indoor heat exchanger 21, for example, the refrigerant condensed and liquefied by exchanging heat with the indoor air sent by the blower 22 flows out from the air conditioner 20.

  The refrigerant that has flowed out of the air conditioner 20 passes through the liquid refrigerant pipe 50 and flows into the outdoor unit 30. Then, the refrigerant that has been decompressed by the expansion valve 34 and is in a gas-liquid two-phase state flows into the outdoor heat exchanger 33. Then, the refrigerant (liquid refrigerant) evaporated and gasified by passing through the outdoor heat exchanger 33 and exchanging heat with outdoor air passes through the four-way valve 32 and is sucked into the compressor 31 again. As described above, the refrigerant of the air conditioner circulates and performs air conditioning (heating).

  As described above, the air conditioner (refrigeration cycle apparatus) according to the second embodiment is configured by using the air conditioner 20 described in the first embodiment, thereby suppressing blowing noise and increasing performance due to rectification. Since an air blower having an inexpensive bell mouth 6 that can measure the cost is used for the air conditioner, the cost of the apparatus can be reduced.

  In the first embodiment and the like described above, the ceiling-embedded indoor unit that is a four-way cassette type that blows air in four directions has been described. However, the present invention also applies to an indoor unit that blows air in two directions, three directions, and the like. be able to.

  Moreover, in embodiment mentioned above, although the air conditioning apparatus was demonstrated as an example of a refrigeration cycle apparatus, For example, it can apply also to the refrigeration apparatus etc. which are other refrigeration cycle apparatuses. Moreover, it can be applied as a blower such as a ventilator.

  DESCRIPTION OF SYMBOLS 1 Housing | casing, 2 makeup | decoration panel, 3 suction grille, 4 fan, 5 fan motor, 6 bell mouth, 6a inner side plane part, 6b inflow inner side curved part, 6c opening part, 6d outer side plane part, 6e inflow outer side curved part, 6f Annular plane part, 6g Thick part, 6h Uneven shape part, 7 Panel outlet, 7a Wind direction vane, 8 Turbo fan, 9 Recessed part, 10 Heat exchanger, 20 Air conditioner, 21 Indoor heat exchanger, 22 Blower, 30 outdoor unit, 31 compressor, 32 four-way valve, 33 outdoor heat exchanger, 34 expansion valve, 40 gas refrigerant pipe, 50 liquid refrigerant pipe.

Claims (3)

A fan that rotates around a rotation axis to generate a gas flow;
An annular wall surface is formed in accordance with the diameter of the fan, the gas inflow side on the upstream side and the gas outflow side opening on the downstream side are curved with respect to the gas flow, and the end of the gas inflow side is curved. The diameter of the opening portion in the intermediate portion between the gas outlet side terminal and the opening portion on the gas inlet side and the diameter of the opening portion on the gas outlet side is smaller than the diameter, and flows into the fan. With a bell mouth that rectifies the gas,
The bell mouth is formed with a concavo-convex shape portion in the annular shape from the gas inlet side to the outlet side of the inner surface of the curved portion,
The blower in which the diameter from the center of the opening part is the same in each part in the circumferential direction of the outer side surface of the bell mouth corresponding to the part where the uneven part is formed. The bell mouth has a flat plate portion formed in a plate shape in a direction perpendicular to the rotation axis direction continuously from the gas inflow side end portion of the bell mouth in accordance with the suction port of the gas flowing in from the outside. the blower of claim 1, characterized in that it has. A compressor that compresses the refrigerant and an outdoor heat exchanger that performs heat exchange between the refrigerant and the outdoor gas;
A refrigeration cycle apparatus comprising: the blower according to claim 1 or 2; and an air conditioner having an indoor heat exchanger that performs heat exchange with an indoor gas.

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