JP3725970B2 - Air conditioner and outdoor unit used therefor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to noise reduction of refrigeration air conditioners used in air conditioners and refrigerators, and is particularly suitable for the protection of the global environment and the reduction of cabinet size (outer diameter) in consideration of recyclability. is there.
[0002]
[Prior art]
As a measure for environmental protection of the air conditioner, it is a condition that the ozone layer is not destroyed, and it is desirable to use an alternative chlorofluorocarbon that does not contain chlorine, specifically, an HFC refrigerant. However, in order to consider the environment, it is necessary not only to use HFC-based refrigerants, but also to be recyclable throughout the product life cycle, easily decomposable structure, and energy saving.
[0003]
In particular, the air conditioner cabinet size (outer diameter) is required to be small with respect to the cooling capacity from the viewpoint of improving recyclability , but it is advantageous to increase the outer diameter to reduce noise. There is a problem that conflicts with downsizing.
[0004]
Further, regarding the noise reduction of the outdoor unit, in order to reduce aerodynamic noise, it is known to provide a cylindrical surface facing the outer periphery of the propeller fan and form a space called a vortex fixing surface chamber in the axial direction. It is described in Kaihei 3-179198. Japanese Patent Application Laid-Open No. 3-206392 discloses a method of reducing noise by increasing the wire pitch of the fan guard at a high wind speed or reducing the wire diameter of the wire in order to reduce the impact sound of the fan guard. Known as described.
[0005]
[Problems to be solved by the invention]
In the above prior art, when installing the outdoor unit, it is necessary to take a wide installation space, which is not only a problem in terms of installation, but especially because the width dimension is large, when it is carried on an elevator for recycling etc. However, there is a problem that it is difficult to say that the environment, particularly recyclability, is sufficiently considered, such as the need for a large elevator.
[0006]
In particular, the one described in Japanese Patent Application Laid-Open No. 3-179198 requires that the outer diameter of the cylindrical portion be sufficiently larger than the outer diameter of the propeller fan, and the collision with the fan guard installed at the bell mouth outlet. There have been problems of increased noise, increased wind noise due to interference with peripheral parts of the fan, and increased wind noise of the propeller fan due to increased rotation speed in order to ensure the necessary air volume.
[0007]
Furthermore, when using HFC refrigerant or non-azeotropic refrigerant mixture, especially R407C refrigerant, when operating under the same conditions as before, it is necessary to secure a large heat transfer area of the heat exchanger compared to the conventional, miniaturization Is disadvantageous. Therefore, in order to enhance the environment, particularly recyclability, there is a problem that it is not sufficient to simply use an alternative chlorofluorocarbon-based refrigerant that does not contain chlorine.
[0008]
An object of the present invention is to solve the above problems and provide an air conditioner suitable for reducing the environment, particularly noise, and an outdoor unit used for them.
[0009]
[Means for Solving the Problems]
The present invention for achieving the above object, the indoor unit and the compressor, heat exchanger, the air conditioner outdoor unit with a connected refrigeration cycle having a blowing fan, refrigerant circulating the refrigeration cycle HFC And the outdoor unit has a circumferential length of the outer peripheral portion of one blade relative to a value obtained by dividing the outermost circumferential length of the blower fan by the number of blades constituting the blower fan. The ratio is 0.8 or more, and the blower fan is provided on the outer periphery of the blower fan, is cylindrical, and has a shape in which the inner diameter is radially expanded in a part of the circumferential direction of the circumference A bell mouth having a loop shape and a plurality of loop wires having different diameters, and having a maximum outer shape substantially equal to the inner diameter of the bell mouth and covering the opening of the bell mouth When, wherein the loop wire are arranged in a plurality of planar, in which those adjacent arranged to take is alternately step.
[0010]
The ratio of the outer circumferential length of one blade to the value obtained by dividing the length of the outermost circumference of the blower fan by the number of blades constituting the blower fan is 0.8 or more, and the blade area is increased. Therefore, the blower fan can improve efficiency. Further, since the bell mouth is enlarged inner diameter in the radial direction in the part of the peripheral direction, the opening area of the outlet to the area of the inflow port is increased, the wind speed decreases, it is possible to reduce the noise it can. Furthermore, the fan guard provided so as to cover the opening at the outlet of the bell mouth can prevent an obstacle from entering . This makes it possible to reduce the size of the air conditioner by using an HFC-based refrigerant that requires a large heat transfer area for the heat exchanger. And can be suitable for environment, particularly noise reduction.
[0012]
Further, according to the present invention, in the above, the loop wire is arranged in a plurality of planes, and the adjacent ones are arranged so as to be different from each other. Thereby, since the direction of the wind blown out from the blower fan is inclined with respect to the axial direction of the blower fan, the substantial opening area in the fan guard can be increased and the wind can pass therethrough.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to FIGS. 1 to 12 as an embodiment of a package type air conditioner. 1 is an exploded perspective view showing a main part of an outdoor unit according to an embodiment, FIG. 2 is a plan view showing the internal configuration, FIG. 3 is a front view, and FIG. 4 is a side view. 5 is a perspective view showing a fan part for blowing air in an outdoor unit according to an embodiment, FIG. 6 is a front view showing the bell mouth, FIG. 7 is a side view showing the bell mouth, and FIG. The front view which shows the propeller fan of the outdoor unit by the form of an Example, FIG. 9 is a side view similarly, FIG. 11 is sectional drawing of the fan guard of the outdoor unit by the form of one Example, FIG. 12 is by the form of one Example It is a figure which shows the refrigerating cycle of an outdoor unit.
[0014]
In recent years, with the increase in the number of stores and office buildings, it is desired to increase the number of air conditioners, and when installing outdoor units for air conditioners, they are often installed on the roofs of buildings. In order to effectively use the space on the rooftop and to enable transportation to the rooftop using an elevator, there is an increasing demand for downsizing and downsizing of the outdoor unit for air conditioning.
[0015]
Reducing the floor area of the outdoor unit reduces the time required for studying the installation layout and improves transportability. Therefore, it is possible to simplify installation work for an air conditioner contractor or the like.
[0016]
In FIG. 1, the lower end of the outdoor unit main body is a base 14 and a saw base 13 for supporting the weight of the product. 19 is covered. In addition, a bell mouth 11 is arranged in the central part of the hood, and a ventilation path for wind sent by the fan 10 is formed. Further, a fan guard 12 is provided on the exit side of the bell mouth 11.
[0017]
On the soco base 13, a compressor 3, an accumulator 4 and an L tank 5 are arranged with a four-way valve 6, a valve 7 and an expansion valve 2 via a refrigeration cycle pipe to form a so-called machine room. In order to secure a wide air passage from the heat exchanger 1 to the fan 10, the integration efficiency of the parts in the machine room is increased, the machine room is made smaller, the ventilation resistance is lowered, and the blowing noise is reduced. Further, a heat exchanger 1 is arranged behind the outdoor unit, and the height direction is lengthened in order to secure the necessary heat transfer area due to the reduced floor area.
[0018]
As a result, the wind speed of the upper portion of the heat exchanger 1 near the blower fan 10 is fast, and the lower portion far from the blower fan 10 is slow, and a wind speed distribution is generated in the vertical direction of the heat exchanger 1. Therefore, a temperature difference occurs between the paths of the heat exchanger 1 and the performance of the heat exchanger is deteriorated. To prevent this, the number of refrigerant pipes in the path with a high wind speed is reduced, and the number of refrigerant pipes in a path with a low wind speed is increased. The temperature difference between the passes is reduced. Here, the refrigerant circulating through the refrigeration cycle or circulating through the heat exchanger 1 is an HFC refrigerant.
[0019]
The blower device includes a motor 9, a fan 10, a bell mouth 11, and a fan guard 12, and is arranged on the upper part of the outdoor unit, and has a structure that blows wind upward.
[0020]
This prevents a so-called short circuit in which the blown wind is short-passed and sucked into the heat exchanger 1. Moreover, even if the outdoor unit is installed horizontally, it is possible to avoid sucking the wind blown out by the adjacent outdoor unit from the heat exchanger 1 of the outdoor unit. Therefore, it is possible to continuously install a plurality of outdoor units in a small installation space.
[0021]
If the outside diameter of the bell mouth 11 or the blower fan 10 which is a propeller fan is made small in order to reduce the floor area, the collision sound at the fan guard 12 installed at the outlet of the bell mouth 11 increases, and the air blows. Increase in wind noise due to interference with peripheral parts of the fan 10 or increase in the number of rotations in order to secure the necessary air volume increases the wind noise in the blower fan 10. Therefore, in order to reduce the size of the outdoor unit, it is necessary to sufficiently increase the outer diameter of the cylindrical portion of the bell mouth 11, and the width or depth of the main body has to be increased.
[0022]
FIG. 5 shows a blower fan portion, a wake cover 19 that serves as a guide at the wind inlet of the blower fan 10, a bell mouth 11 that directs the wind to suppress vortex generation and reduce the flow velocity, and the blower fan 10. It has a fan guard 12 that prevents a human hand from entering or an object from entering. It is also possible to construct a ventilation system by integrating the wick 19 and the bell mouth 11 together.
[0023]
In order to reduce the floor area of the outdoor unit, the outer diameter of the blower fan 10 is restricted by the cabinet size of the main body. In general, in order to reduce noise, the outside diameter of the blower fan 10 is increased to reduce the rotational speed. However, it is necessary to increase the air volume in order to ensure the cooling capacity or to use HFC refrigerant or non-azeotropic refrigerant mixture, particularly R407C refrigerant.
[0024]
As shown in FIGS. 6 and 7, the bell mouth 11 of the present embodiment is provided with an inner peripheral cylindrical surface 11 a facing the outer periphery of the blower fan 10, and in a part of the circumferential direction of the cylinder in the radial direction from the tip in the discharge direction. An enlarged shape is formed, and a vortex fixing chamber 11d including a vortex fixing vertical surface 11b and an axial vortex fixing horizontal surface 11c is formed.
[0025]
As a result, the blade tip vortex growing from the blade tip of the blower fan 10 is attracted to the vortex fixing chamber 11d, and the aerodynamic performance of the fan is improved. Therefore, interference between the blade tip vortex and the blade tip is reduced, and aerodynamic noise is reduced. Further, since the effective flow path area is increased at the discharge port of the blower fan 10, the discharge flow velocity is reduced, and aerodynamic noise at the fan guard can be reduced.
[0026]
Next, the shape of the blower fan 10 will be described with reference to FIGS. ◆ In order not to increase the outside diameter of the fan 10 for blowing, the lift of the blades is reduced, the amount of work to scrape the wind per blade is increased, and the rotation speed is reduced. That is, the circumferential length of the outer peripheral portion of one blade with respect to the value obtained by dividing the outermost circumferential length of the blower fan 10 by the number of blades in order to increase the work amount for scraping off the wind per blade . The tip of the blade is made long so that the ratio to is 0.8 or more .
[0027]
Referring to FIG. 5, 11 will be described fan guard 12. The function of the fan guard 12 of this embodiment has a function as a protection, and has a sufficient strength to prevent an obstacle from entering. In particular, it is possible to prevent people from accidentally putting their hands and hitting the blower fan 10. Therefore, the outer and inner wire diameters are increased so that the entire fan guard 12 is not bent by a hand load. In addition, noise is reduced to a shape that has minimal strength so that air resistance can be reduced as much as possible to reduce the impact noise generated by the wire at the bell mouth outlet, and one hand cannot reach the blower fan through the gap between the wires. We are trying to reduce it.
[0028]
In addition, as shown in FIG. 11, the wind blown from the blower fan does not normally hit the fan guard 12 perpendicularly, but because it hits diagonally, the wire material is stepped alternately so that the opening of the fan guard 12 is widened in the wind blowing direction. In order to increase safety and reduce noise, the opening is narrowed in the direction perpendicular to the plane of the fan guard 12 where there are many cases where human hands hit.
[0029]
Next, the refrigeration cycle will be described with reference to FIG. The refrigeration cycle is configured by sequentially connecting an accumulator 4, a compressor 3, a four-way valve 6, a heat exchanger 1, and an expansion valve 2 via a refrigeration cycle pipe. By delivering these element devices compactly into the machine room, the volume of the blower chamber between the heat exchanger 1 and the fan 10 is increased.
[0030]
Heavy objects such as the compressor 3, the accumulator 4, and the liquid tank 5 need to be fixed to the saw base 13. For this reason, by placing these element devices vertically, the loading efficiency on the soco base can be increased, and the soco base can be miniaturized.
[0031]
As described above, according to one embodiment, there are the following advantages. ◆
(1) By reducing the size and size of the outdoor unit, the cost of the product can be reduced. In addition, the development of medium-sized and large-sized machines by combining multiple base machines will shorten the product development period and reduce product development costs.
[0032]
(2) The installation space for the outdoor unit can be reduced, and the space on the roof, veranda, eaves, etc. of the building can be used effectively.
[0033]
(3) The transportability of the outdoor unit can be improved by downsizing and downsizing the outdoor unit. For example, it is possible to improve the loading efficiency on a transport vehicle such as a truck. An elevator can be used to transport the outdoor unit to the building roof.
[0034]
(4) With the downsizing and downsizing of the outdoor unit, the packing material for the outdoor unit can be reduced, the amount of wood and cardboard used can be reduced, and environmentally friendly products can be provided to the market.
[0035]
【The invention's effect】
As described above, according to the present invention, the blade area is increased to improve the efficiency of the blower fan, and a part of the circumferential direction of the bell mouth is enlarged in the radial direction so as to cover the opening of the bell mouth. Since the fan guard is provided, noise does not increase even if the air volume of the blower fan is increased. Therefore, the air conditioner and the outdoor unit used for the air conditioner can be reduced in size, and can be suitable for environment, particularly noise reduction.
[0037]
Furthermore, according to the present invention, the loop wires are arranged in a plurality of planes, and adjacent ones are stepped from each other, so that the substantial opening area in the fan guard is increased to allow the wind to pass therethrough. Can do.
[Brief description of the drawings]
FIG. 1 is a component diagram showing the structure and components of an outer plate according to an embodiment.
FIG. 2 is a plan view showing the internal structure of one embodiment.
FIG. 3 is a front view showing the internal structure of the embodiment.
FIG. 4 is a side view showing the internal structure of one embodiment.
FIG. 5 is a perspective view showing components of a blower system of the blower device.
FIG. 6 is a front view of a bell mouth according to an embodiment.
FIG. 7 is a side view of a bell mouth according to one embodiment.
FIG. 8 is a front view of the propeller fan according to the embodiment.
FIG. 9 is a side view of the propeller fan according to the embodiment.
FIG. 11 is a cross-sectional view of a fan guard according to an embodiment.
FIG. 12 is a refrigeration cycle system diagram of an outdoor unit according to an embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Heat exchanger, 2 ... Expansion valve, 3 ... Compressor, 4 ... Accumulator, 5 ... Liquid tank, 6 ... Four-way valve, 7 ... Valve, 8 ... Outdoor control apparatus, 9 ... Electric motor for ventilation (outdoor) , 10 ... blowing fan (outdoor), 11 ... bellmouth 11 a ... inner circumferential cylindrical surface, 11b ... eddy fixing longitudinal face, 11c ... eddy fixing transverse face, 11d ... vortex fixing chamber, 12 ... fan guard, 13 ... Soko Base, 14 ... Base, 15 ... Maeka Bashita, 16 ... Maeka Babaue, 17 ... Wakikaba, 18 ... Wakikaba, 19 ... Wakaba, 20 ... Hogoami.

Claims (1)

In an air conditioner equipped with an indoor unit and a refrigeration cycle to which an outdoor unit having a compressor, a heat exchanger, and a fan for blowing is connected,
The refrigerant circulating in the refrigeration cycle is an HFC refrigerant,
In the outdoor unit, the ratio of the circumferential length of the outer peripheral portion of one blade to the value obtained by dividing the outermost circumferential length of the blower fan by the number of blades constituting the blower fan is 0. 8 or more of the blower fan, and a bell mouth provided on the outer periphery of the blower fan, having a cylindrical shape, and having a shape in which the inner diameter is radially expanded in a part of the circumferential direction of the circumference, , external shape whose diameter is looped is arranged different loop wires, and a fan guard which is adapted to the maximum outer shape covers the opening of substantially equal the bellmouth and the inner diameter of the bell mouth, said An air conditioner characterized in that the loop wires are arranged in a plurality of planes, and adjacent ones are arranged so that steps are staggered alternately .

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