The present invention relates to an outdoor unit of an air conditioner. More specifically, the present invention relates to a type of outdoor unit of an air conditioner that blows out air from a ceiling.
A conventional type of outdoor unit of an air conditioner that blows out air from a ceiling includes an air discharge port formed on a top panel of a casing, and a fan guard (also called a fan grille) is disposed so as to cover the air discharge port (for example, see Patent Document 1).
<Patent Document 1>
Japanese Patent Application Publication No. 2004-156828
With this type of outdoor unit of an air conditioner, it is desired to improve the performance while maintaining the compact size. Also for the fan that blows out air, it is desired to increase the air volume while maintaining the size equal to that of the conventional fan.
However, conventionally, the fan guard mounted so as to cover the air discharge port disposed with an impeller of the fan becomes a resistance at the time of air blowing, causing a pressure loss. For the safety reason, it is unthinkable to remove the fan guard for a purpose of eliminating such pressure loss. However, if pressure loss is reduced as much as possible, it is possible to increase the air volume by a corresponding amount.
A purpose of the present invention is to provide an outdoor unit capable of reducing pressure loss due to the presence of a fan guard and improving the performance of an air conditioner.
An outdoor unit of an air conditioner according to a first aspect of the present invention includes a fan, an air discharge port, and a fan guard. The air discharge port is an opening for discharging air blown out from the fan to the outside. The fan guard covers the air discharge port and includes a spaced away portion disposed away from the fan by a distance greater than the length of a test finger. In addition, the spaced away portion has a first opening formed therein into which the test finger can be inserted.
With a conventional outdoor unit of an air conditioner, a resin fan guard has a large number of slits formed therein through which air passes. The maximum width of each slit is limited to be below 12 mm so as to prevent the test finger from being inserted.
Contrarily, with the outdoor unit according to the first aspect of the present invention, the fan guard is provided with the spaced away portion at a position away from the fan by a distance greater than the length of the test finger. With such spaced away portion, even when a finger is inserted therein, the finger tip is prevented from touching the rotating fan. Thus, the first opening at the spaced away portion is formed large (wide width) enough for the test finger to be inserted therein. As described above, the first opening of a large size is formed at the spaced away portion of the fan guard. Thus, a state is achieved in which air blown out from the air discharge port is discharged to the outside of the outdoor unit, without being subjected to large resistance by the fan guard, and the pressure loss due to the presence of the fan guard is reduced. Accordingly, with the outdoor unit according to the first aspect of the present invention, it is possible to increase the air volume and raise the static pressure by the fan, and thus the performance of the air conditioner can be improved.
An outdoor unit of an air conditioner according to a second aspect of the present invention is the outdoor unit according to the first aspect of the present invention, wherein the spaced away portion is disposed away from the fan by 80 mm or more, and the minimum width of the first opening of the spaced away portion is 12 mm or more.
An outdoor unit of an air conditioner according to a third aspect of the present invention is the outdoor unit according to the first or second aspect of the present invention, wherein the spaced away portion is disposed away from the fan by 100 mm or more, and the minimum width of the first opening of the spaced away portion is 15 mm or more.
An outdoor unit of an air conditioner according to a fourth aspect of the present invention is the outdoor unit according to any one of the first through third aspects of the present invention, wherein the fan guard further includes a near-fan portion that is closer to the fan than the spaced away portion is. Also, the near-fan portion has a second opening formed therein into which the test finger cannot be inserted.
When an opening is provided only at the spaced away portion disposed sufficiently away from the fan and an opening is not provided to a portion near the fan, there is a case where a sufficient amount of reduced pressure loss cannot be ensured. Therefore, here, in view of such a case, the near-fan portion is also provided with the second opening whose size is small (narrow width) enough to prevent the test finger from being inserted therein. Accordingly, it is possible to further reduce pressure loss.
An outdoor unit of an air conditioner according to a fifth aspect of the present invention is the outdoor unit according to the fourth aspect of the present invention, wherein the maximum width of the second opening is smaller than 12 mm.
An outdoor unit of an air conditioner according to a sixth aspect of the present invention is the outdoor unit according to the fourth or fifth aspect of the present invention, wherein the spaced away portion faces the air discharge port. Also, the near-fan portion extends toward the periphery of the air discharge port from the periphery of the spaced away portion.
Here, the spaced away portion facing the air discharge port is disposed sufficiently away from the fan. Also, within the portion which prevents the contact with the fan between the spaced away portion and the peripheral portion of air discharge port, the near-fan portion which is close to the fan is disposed with the second opening so as to reduce pressure loss while securing the safety.
Note that, in the present invention, when the spaced away portion is disposed too far from the fan, the outdoor unit becomes unnecessarily large. Thus, the distance between the spaced away portion and the fan should be equal to or smaller than 500 mm, preferably equal to or smaller than 300 mm. In addition, when the minimum width of the first opening of the spaced away portion is too large, a hand can be inserted toward the fan side through the first opening. Thus, in order to prevent this, the minimum width of the first opening should be equal to or smaller than 60 mm, preferably equal to or smaller than 50 mm. In addition, as for the second opening whose maximum width is set to be smaller than 12 mm so as to prevent the finger from being inserted therein, when such maximum width is too small, the air resistance by the near-fan portion becomes large, and thus the maximum width should be equal to or greater than 3 mm, preferably equal to or greater than 5 mm.
According to the present invention, it is possible to reduce the pressure loss due to the presence of the fan guard while ensuring a safety function by the fan guard to prevent the contact with the fan, thus improving the performance of the air conditioner compared to the conventional air conditioner.
a) is a plan schematic view of a 5-horsepower outdoor unit.
b) is a plan schematic view of an 8, 10, 12-horsepower outdoor unit.
c) is a plan schematic view of a 14, 16, 18-horsepower outdoor unit.
<Structure of the Air Conditioner>
The compressor 11, the four way switching valve 12, the outdoor heat exchanger 13, and the outdoor expansion valve 14 are included in each outdoor unit 2, and the indoor expansion valve 15 and the indoor heat exchanger 16 are included in each indoor unit 3. In addition, the four way switching valve 12 and the indoor heat exchanger 16 are connected by a gas-side refrigerant communication pipe 17a, and the outdoor expansion valve 14 and the indoor expansion valve 15 are connected by a liquid-side refrigerant communication pipe 17b. The refrigerant communication pipes 17a, 17b are disposed between the outdoor unit 2 and the indoor unit 3. In addition, although not shown, an accumulator and other auxiliary components are also provided in the outdoor unit 2.
A gas-side shut-off valve 18 and a liquid-side shut-off valve 19 are provided at a terminal portion of the refrigerant circuit inside of the outdoor unit 2. The gas-side shut-off valve 18 is disposed on the four way switching valve 12 side, and the liquid-side shut-off valve 19 is disposed on the outdoor expansion valve 14 side. The gas-side refrigerant communication pipe 17a is connected to the gas-side shut-off valve 18, and the liquid-side refrigerant communication pipe 17b is connected to the liquid-side shut-off valve 19. These shut-off valves 18, 19 are in a closed state when the outdoor units 2 and the indoor units 3 are installed. Also, after each of the units 2 and 3 are installed onsite and the gas-side refrigerant communication pipe 17a and the liquid-side refrigerant communication pipe 17b are connected to the shut-off valves 18, 19, the shut-off valves 18, 19 are put into an opened state.
The refrigerant circuit of the air conditioner 1 shown in
In addition, each outdoor unit 2 is provided with an outdoor fan 29 that blows air to the outdoor heat exchanger 13 and promotes heat exchange between refrigerant and air (see
<Operation of Air Conditioner>
Next, the operation of this air conditioner is described.
First, during cooling operation, the four way switching valve 12 is held in a state shown by the solid lines in
On the other hand, during heating operation, the four way switching valve 12 is held in a state shown by the dashed lines in
Note that in either case of cooling operation and heating operation, the indoor expansion valve 15 of the indoor unit 3 during non-operation is in a closed state, and hardly any refrigerant flows in the indoor heat exchanger 16 of such indoor unit 3.
<Configuration of Outdoor Unit>
Next, the outdoor unit 2 is described in detail with reference to
(Casing and Other Components)
Side plates 22 and a back plate 23 of the casing are integrally formed with support pillars 51, 52, 53, and 54. A front plate 21 of the casing is mounted to the outside of the support pillars 52, 53. In addition, four support pillars 51 to 54 that vertically extend are mutually connected by a bottom frame 61 in the vicinity of the lower end, and a cross stay 62 and a motor support table 63 at the upper portion. The motor support table 63 is equipped with a motor 70 having an impeller shown in
(Bottom Frame and Shut-Off Valve)
The bottom frame 61 supports the compressor 11, the outdoor heat exchanger 13, and the like, and fulfills a role for fixing the shut-off valves 18, 19 via a mounting structure 64. In addition, the bottom frame 61 has an opening at a portion below the shut-off valves 18, 19.
As shown in
(Structure Below Shut-Off Valve)
In addition, both of a pipe connection port 18a of the gas-side shut-off valve 18 and a pipe connection port 19a of the liquid-side shut-off valve 19 face downward in the same manner. In the drawing, the structures of the shut-off valves 18, 19 are simplified. However, the shut-off valves 18, 19 do not have a conventional structure in which they are joined to the refrigerant communication pipes 17a, 17b with a flare nut or a flange, but have a structure in which brazing (a metal are joined to a metal by using wax with heat) can be performed. Accordingly, when performing the joining work of the shut-off valves 18, 19 and the refrigerant communication pipes 17a, 17b onsite, there is no need for a screw tightening work. Thus, the construction performance is improved and the possibility of refrigerant leakage can be reduced.
(Structure of Fan Guard)
A fan guard 30 is a three-dimensional integrated grille of a low carbon steel wire, and the entire surface thereof is coated with a resin coating. The strength is increased compared to a conventional resin grille, and the load capacity is 60 kgf. In addition, as described below, the blow out area (opening ratio) is larger compared to the conventional resin grille.
More specifically, the fan guard 30 is formed by a steel wire with a diameter of 2.0 mm and a steel wire with a diameter of 3.5 mm, and a crossing portion is welded. The fan guard 30 is formed by a spaced away portion 31 in a quadrilateral shape which is approximately 110 mm away from the outdoor fan 29 in a height direction, and a lateral side portion 32 that surrounds a gap between the spaced away portion 31 and the top panel 24 in a height direction. A dimension H1 in
The spaced away portion 31 has a large number of first openings OP1 formed therein by a steel wire in a grid pattern. The width of the narrow side of each first opening OP1 is equal to or greater than 20 mm. Specifically, a pitch P1 of the steel wire that forms the first openings OP1 is 22 mm and the diameter of the steel wire is 2 mm. Therefore, the width of each first opening OP1 is 20 mm. The size of the first opening OP1 is such that a test finger 100 shown in
On the other hand, the size of a second opening OP2 formed in each near-fan portion 32a of the lateral side portion 32 is limited to a small size, in view of that the distance between a portion of the near-fan portion 32a closest to the outdoor fan 29 and the outdoor fan 29 is less than 50 mm. Specifically, a steel wire pitch P2 on the narrow side of the steel wire in a grid pattern is 11 mm, and consequently the width of the second opening OP2 is reduced to approximately 9 mm. Accordingly, a situation where the test finger 100 shown in
The connecting portions 32b of the lateral side portion 32 are further away from the outdoor fan 29 than the near-fan portions 32a are, but the steel wire pitch is set in accordance with the steel wire pitch of the near-fan portions 32a.
Note that, as shown in
As described above, with the fan guard 30, the spaced away portion 31 is provided at a position away from the outdoor fan 29 (a position approximately 110 mm away) by a distance longer than the length of the test finger 100 (80 mm). With such spaced away portion 31, a person is prevented from touching the rotating outdoor fan 29 with his fingertip even if he inserts his finger. Consequently, each first opening OP1 of the spaced away portion 31 is formed to be large enough for the test finger 100 to be inserted (i.e., the width of the narrow side is equal to or greater than 20 mm). Because such large first openings OP1 as described above are formed at the spaced away portion 31 of the fan guard 30, air blown out from the air discharge port formed by the bellmouth 29a and the circular hole of the top panel 24 is discharged to the outside of the outdoor unit 2 without being subjected to great resistance from the fan guard 30, and pressure loss due to the presence of the fan guard 30 is reduced.
In addition, with the fan guard 30, the lateral side portion 32 that surrounds the gap between the spaced away portion 31 and the top panel 24 in a height direction also has an opening formed therein for air ventilation, which is small enough to prevent a person from inserting his finger. With this opening, resistance against airflow blown out upward from the bellmouth 29a is reduced as much as possible. Also in this manner, pressure loss due to the presence of the fan guard 30 is reduced.
In these manners, the air conditioner 1 in which the fan guard 30 is adopted can increase the air volume and raise the static pressure by the outdoor fan 29, thus significantly improving the performance. Specifically, pressure loss due to the fan guard 30 is reduced to half or less, compared to the case where the conventional fan guard in which a person cannot insert his finger in any portion and which covers the air discharge port in a manner adjacent to the outdoor fan is used.
<Control Board Button and High Luminance Display of Outdoor Unit and Usage Thereof>
What is indicated by the dotted lines in
In addition, as shown in
(Display of Information on Pressure and Temperature of Refrigerant)
This air conditioner 1 is configured such that, a pressure sensor and an electronic pressure gauge of brazed type are installed when a pressure gauge is installed as an option, unlike a conventional manner in which a Bourdon tube pressure gauge is connected to a gauge port of a refrigerant pipe with a flare. A pressure measured by such electronic pressure gauge with high precision is displayed on the display unit 45 along with the temperature of refrigerant.
(Automatic Refrigerant Charging Operation)
The air conditioner 1 is equipped with an automatic refrigerant charging operation function. Here, refrigerant can be charged to obtain an appropriate amount with a high precision of 500 grams. When a refrigerant canister is connected to a charging port and one of the push buttons 43 on the control board 42 is pressed, the automatic refrigerant charging operation is started, and the operation automatically stops when the appropriate amount is added. In addition, when the canister becomes empty, a display indicating an “empty” state appears on the display unit 45.
Accordingly, with the air conditioner 1, conventional onsite work such as manually calculating an additional amount of refrigerant to be charged, manually charging additional refrigerant, and manually determining charging by using a canister-scale and/or a pressure gauge has become extremely simple.
(Automatic Test Run)
The air conditioner 1 is equipped with an automatic test run function that is performed after the automatic refrigerant charging operation. When one of the push buttons 43 on the control board 42 is pressed after the automatic refrigerant charging operation, a check for an erroneous connection of pipes in the refrigerant system, a check to see if the gas-side shut-off valve 18 and the liquid-side shut-off valve 19 are left closed, a sensor check, and a check for the amount of refrigerant are performed, and the trial run is automatically finished.
(Refrigerant Leakage Detection Operation)
The air conditioner 1 is equipped with a refrigerant leakage detection operation function. The refrigerant leakage detection has a precision of 500 grams, and the refrigerant leakage detection operation is started when one of the push buttons 43 on the control board 42 is pressed. When the push button 43 is pressed, all the indoor units 3 automatically start cooling operation, detect the amount of refrigerant leakage within approximately 30 minutes, and stop the operation. Then, a display by LED on the control board 42 is performed or an indicator is displayed on the display unit 45. Also, for example, when only 0.6 kg of refrigerant has leaked from the initial charging amount of refrigerant, a number “0.6” is displayed on the display unit 45.
(Automatic Diagnostic Operation)
The air conditioner 1 starts an automatic diagnostic operation when one of the push buttons 43 on the control board 42 is pressed. This automatic diagnostic operation contributes to acceleration of inspection work, and enables quick diagnostics of problems. Specifically, the automatic diagnostic operation helps to guess where the problems are, such as unplugged connectors and malfunction of a thermistor, solenoid valve, and motor-operated expansion valve, compressor failure, a communication error between the outdoor units 2 and the indoor units 3, and the like.
In addition, the automatic diagnostic operation can be used for checking whether or not maintenance work was appropriate, by performing the automatic diagnostic operation after repair and checking. Here, unexpected maintenance failure such as that a thermistor is erroneously mounted and the like can be prevented.
Note that a result of the automatic diagnostic operation can also be displayed in a simple manner by using the display unit 45.
(A)
As shown in
Here, as each motor support table 63 that extends across the cross stays 62 in
Note that the shape of the lower surface of the motor support table 63 is not limited to the inverted triangular cross sectional shape shown in
(B)
As shown in
The mounting structure 64 is formed by a pair of pillars 91, 91 that extend upward from the bottom frame 61 and a horizontal beam 92 that connects upper end portions of the pillars 91, 91. A concave-convex pattern is formed or the drawing process is performed on the pillars 91, 91 and the horizontal beam 92 in order to ensure the strength of each of them. In addition, the horizontal beam 92 is used to support the shut-off valves 18, 19, and an opening OP3 is formed below the shut-off valves 18, 19. Accordingly, when performing brazing below the shut-off valves 18, 19 to join the refrigerant communication pipes 17a, 17b to each other, a space for such work can be secured. In addition, it is possible to install the refrigerant communication pipes 17a, 17b such that refrigerant communication pipes 17a, 17b are laid through the opening OP3.
In addition, as shown in
(C)
The outdoor unit 2 of the air conditioner 1 is preferably configured, in case of a breakdown, such that operation data (high pressure, low pressure, various setting values, subcool, and the like) ten minutes before the occurrence of a breakdown is stored in a memory in the switch box 41. By so doing, data can be analyzed in detail after the breakdown, and the cause of the breakdown can be determined, which allows a countermeasure to be easily taken and the cause of the breakdown to be easily removed.
Number | Date | Country | Kind |
---|---|---|---|
2005-318921 | Nov 2005 | JP | national |
2006-042557 | Feb 2006 | JP | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
---|---|---|---|---|
PCT/JP2006/321522 | 10/27/2006 | WO | 00 | 4/21/2008 |