JP2017053561A - Outdoor unit of air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce costs and to simplify control while enabling a cooling operation under a low outside air condition.SOLUTION: An outdoor unit of an air conditioner includes a housing, a blowout port formed at an upper portion of the housing, a suction port formed on a side face of the housing, an outdoor heat exchanger disposed in correspondence with the suction port, and an outdoor fan for delivering the air sucked from the suction port to the blowout port. Further it includes a blowout port hood covering an upper part of the blowout port, a discharge port formed on the blowout port hood and blowing out the air blown out from the blowout port to the outside of the blowout port hood, an opening/closing damper for opening and closing an opening portion of the discharge port, and a bypass flow channel disposed at a side of a housing side face at the same side as the discharge port, and guiding the air blown out from the blowout port to make the air flow to the suction port by operating the opening/closing damper in a closing direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an outdoor unit of an air conditioner, and more particularly to an apparatus that facilitates a cooling operation under a low outside air temperature condition.

  The heat pump air conditioner uses the outdoor heat exchanger as a condenser during cooling operation, and changes the air volume by changing the rotational speed of the outdoor fan in order to adjust the condensation capacity. Under the low outside air temperature condition, since the temperature difference between the high-temperature and high-pressure gas refrigerant and the outside air temperature is large, the operation is performed with the outdoor fan set to the minimum rotation speed and the air flow rate as low as possible.

  However, under low outdoor air temperature conditions, even if the outdoor fan is operated at the minimum rotational speed, the condensation capacity of the outdoor heat exchanger may become excessive. In addition, the condensing capacity may be excessive even when the amount of ventilation to the outdoor heat exchanger is increased by natural wind. If the condensing capacity is excessive, the condensing pressure may decrease and the reliability of the compressor may not be ensured, or the cooling capacity may be excessive and freezing of the indoor heat exchanger may occur.

  For this reason, it was necessary to ensure the reliability of the compressor and to prevent the indoor heat exchanger from freezing, and there was a problem that stable cooling operation became difficult.

  As countermeasures, conventionally, when cooling operation is performed under a low outdoor air temperature condition, an outdoor fan is intermittently operated, and a wind barrier is installed around the outdoor unit in order to suppress natural air inflow to the outdoor heat exchanger. Or measures, such as installing the hood which covers the suction inlet and blower outlet of an outdoor unit, are generally taken.

  As this kind of conventional technology, there is one described in Japanese Patent Publication No. 2013-533457 (Patent Document 1). In this Patent Document 1, an opening / closing damper is provided in an outlet hood (exhaust hood), the opening / closing damper is closed in accordance with a decrease in the outside air temperature, and the pressure loss of the outlet channel is increased, thereby reducing the minimum of the outdoor fan. It describes what further reduces the air flow rate at the rotational speed.

  In addition, the thing of this patent document 1 is made into the hood which integrated the blower outlet hood and the suction inlet hood, and the opening and closing damper provided in the blower outlet hood, and the opening and closing provided in the short circuit flow path from the blower outlet to the suction inlet. An example in which two types of opening / closing dampers with dampers are provided is also described.

  In this example, at the time of cooling operation under a low outside air temperature condition, the opening / closing damper of the outlet hood is closed, and the opening / closing damper provided in the short circuit flow path is opened, whereby the air containing exhaust heat exhausted from the outdoor fan is discharged. A part of the circuit is short-circuited to the inlet side of the outdoor heat exchanger. By comprising in this way, since the air temperature which passes the said outdoor heat exchanger can be made high and a condensation pressure can be raised, the work load of a compressor can be reduced.

Special table 2013-533457 gazette

  In the thing of the said patent document 1, in what is trying to short-circuit air from a blower outlet to a suction inlet, the opening-and-closing damper provided in the said outlet hood, and the opening-and-closing damper provided in the said short circuit flow path It is necessary to install two types of opening / closing dampers, and there is a problem that the cost of the hood provided in the outdoor unit increases. Moreover, it is necessary to control each open / close damper individually, and there is a problem that the control is complicated.

  An object of the present invention is to obtain an outdoor unit of an air conditioner that enables cooling operation under low outdoor air conditions, and that can also reduce costs and simplify control.

In order to achieve the above object, the present invention is provided corresponding to the housing, the air outlet provided in the upper portion of the housing, the suction port provided in the side surface of the housing, and the suction port. An outdoor unit of an air conditioner including an outdoor heat exchanger and an outdoor fan that sends air sucked from the suction port to the blower outlet, the blower outlet hood covering the upper side of the blower outlet, and the blower outlet A discharge port provided in the hood and for blowing out the air blown from the blower outlet to the outside of the blower outlet hood;
The opening / closing damper that opens and closes the opening of the discharge port, and the air blown out from the outlet by operating in the direction of closing the opening / closing damper provided on the side of the casing on the same side as the discharge port And a bypass flow path for flowing to the suction port.

  According to the present invention, it is possible to obtain an outdoor unit of an air conditioner that enables cooling operation under low outdoor air conditions, and that can also reduce costs and simplify control.

The schematic diagram which shows Example 1 of the outdoor unit of the air conditioner of this invention. The schematic diagram which shows the driving | running state different from the driving | running state shown in FIG. The schematic diagram which shows the driving | running state different from the driving | running state shown in FIG. 1, FIG. The flowchart explaining the control flow in the outdoor unit of the air conditioner shown in FIG. The flowchart explaining another control flow different from FIG.

  Hereinafter, the specific Example of the outdoor unit of the air conditioner of this invention is described using drawing. In each figure, the part which attached | subjected the same code | symbol has shown the same part.

Embodiment 1 of an outdoor unit of an air conditioner according to the present invention will be described with reference to FIGS.
Initially, the structure of the outdoor unit of a present Example is demonstrated using FIGS. 1-3. FIG. 1 is a schematic diagram showing an outdoor unit of an air conditioner according to a first embodiment of the present invention (showing an operating state under a high outdoor air operating condition), and FIG. FIG. 3 is a schematic diagram showing an operation state further different from the operation state shown in FIG. 1 and FIG. 2 (under low outdoor air and low load conditions). Is shown in the operation state).

First, the configuration of the outdoor unit in the first embodiment will be described with reference to FIG.
The outdoor unit 1 is provided corresponding to the housing 11, the suction port 12 provided on the back side of the housing 11, the air outlet 13 provided in the upper part of the housing 1 a, and the suction port 12. And an outdoor heat exchanger 14 for exchanging heat between the refrigerant and the outdoor air, and an outdoor fan 15 for sending the air sucked from the suction port 12 to the blowout port 13. Reference numeral 15a denotes a fan motor that drives the outdoor fan 15 and can vary the rotation speed. 16 is an outside air thermistor (outside air temperature detector) provided at the suction port 13, and 17 is a pressure sensor (pressure detector) for detecting the condensation pressure of the outdoor heat exchanger 15. Reference numeral 18 shown by a one-dot chain line is an electrical component box containing a control device or the like, and is provided on the upper front side in the housing 11.

The outdoor unit 1 includes a blower outlet hood (upper surface cover member) 2 that covers the upper side of the blower outlet, and a suction port hood (side cover member) 3 that is provided so as to cover the suction port.
The air outlet hood 2 includes a snow protection top plate 21 that covers the air outlet 13 at the upper part of the housing, an air outlet 22 for exhausting air blown from the air outlet 13 to the outside, and the air outlet 22. An opening / closing damper 23 that opens and closes and a blowing thermistor (blowing temperature detector) 24 that detects the temperature of the air blown out from the blowing outlet 13 are provided. The inlet hood 3 is provided with a windproof side wall 31 that covers the inlet 13 and an outside air inlet 32 for introducing outside air and guiding it to the inlet 12.

  The outlet 22 of the outlet hood 2 is provided on the same back side as the inlet 13 provided in the casing 11, and the outlet hood 2 and the inlet hood 3 are connected to the outlet 22. Connected at the bottom of the. In addition, a bypass flow path 40 that communicates from the lower portion of the discharge port 22 into the suction port hood 3 is provided at the connection portion.

  The outside air thermistor 16, the pressure sensor 17, and the blowout thermistor 24 are used in the control to be described later with reference to FIGS. 4 and 5, and do not necessarily include all the thermistors and pressure sensors. What is necessary is just to provide what is necessary according to the form of control. Further, if the detection target can be detected by another alternative means, it may be used.

  The open / close damper 23 is composed of a plurality of blades. In the example shown in FIG. 1, the open / close damper 23 is composed of three blades 23a, 23b, and 23c. As shown in FIG. 1, when the opening / closing damper 23 is opened, the air blown out from the outlet 13 can be discharged from the outlet 22, and when the opening / closing damper 23 is closed, As shown in FIG. 2, the air outlet 22 is closed, and the air blown out from the outlet 13 is configured to flow to the inlet 12 via the bypass channel 40.

  The outdoor unit 1 shown in FIG. 1 shows an operation state when the air conditioner performs a cooling operation under a high outdoor air operation condition (an operation condition when the temperature detected by the external air thermistor 16 is higher than a predetermined temperature). Yes. In this operating state, in order to ensure the necessary condensation capacity in the outdoor heat exchanger 15, the rotational speed of the outdoor fan 15 is increased (the rotational speed of the fan motor 15a is increased) to increase the amount of air flow, The open / close damper 23 is set to a fully open horizontal state (a state where the blade inclination angle is approximately 90 degrees with respect to the vertical direction). As a result, the outside air is sucked from the outside air introduction port 32 as shown by an arrow and flows to the suction port 12, and exchanges heat with the high-temperature and high-pressure refrigerant when passing through the outdoor heat exchanger 14 to become high-temperature air. Thereafter, the air flows from the outlet 13 to the outlet 22 as indicated by the arrow and is discharged to the outside of the outdoor unit 1.

  FIG. 2 is a diagram showing an operation state different from the operation state shown in FIG. 1, and the air conditioner is cooled under a low outside air operation condition (an operation condition when the temperature detected by the outside air thermistor 16 is a predetermined temperature or less). The driving | running state in the case of driving | running is shown. The configuration of the outdoor unit 1 shown in FIG. 2 is the same as that in FIG. In this operating state, since it is necessary to suppress the condensing capacity in the outdoor heat exchanger 14, the rotational speed of the fan motor 15 a is reduced to control the amount of air blown by the outdoor fan 15. Since the temperature is low, the condensing capacity in the outdoor heat exchanger 15 may become excessive even if the rotational speed of the outdoor fan 15 is set to the minimum rotational speed.

  In this case, the outdoor fan 15 is operated at the minimum number of revolutions, and is controlled so that the angle of the opening / closing damper 23 is small (the inclination angle of the blade is small with respect to the vertical direction). By reducing the angle of the opening / closing damper 23, as shown in FIG. 2, the flow path discharged from the discharge port 22 to the outside is narrowed, and the discharge amount to the outside is reduced, as indicated by the arrow. In addition, the flow rate to the bypass channel 40 increases. Thereby, a part or most of the air blown out from the blowout port 13 can be made to flow to the suction port 12 side. This bypass flow rate can be adjusted by controlling the angle of the open / close damper 23.

  By setting the operation state shown in FIG. 2, the air that has passed through the outdoor heat exchanger 14 and exchanged heat with the high-temperature and high-pressure refrigerant by the rotation of the outdoor fan 11 is blown out from the outlet 13. The flow is divided into an external flow blown from the discharge port 22 and a short circuit to the suction port 12.

  Therefore, the air flowing in from the suction port 13 includes the external air flowing in from the outside air introduction port 32 and the air flowing in from the outlet 13 to the suction port 12 through the bypass channel 40 through a short circuit. Will be mixed. The air that is short-circuited from the outlet 13 has a higher temperature than the air introduced from the outside air inlet 32 due to heat exchange with the high-temperature and high-pressure refrigerant, and the air that passes through the outdoor heat exchanger 14 By increasing the temperature, it is possible to suppress the condensing capacity in the outdoor heat exchanger 14.

  By adjusting the angle of the open / close damper 23, the ratio of the amount of air discharged to the outside and the amount of air that is short-circuited can be varied, so that the rotational speed of the outdoor fan 15 is not changed. Alternatively, it is possible to adjust the condensing capacity of the outdoor heat exchanger 14 at the minimum rotational speed. At this time, even if natural wind is blown to the outdoor unit 1, the influence on the air flow rate passing through the outdoor heat exchanger 14 can be suppressed by the windproof side wall 31 of the inlet hood 3.

  FIG. 3 is a diagram showing an operation state further different from the operation state shown in FIGS. 1 and 2, and is a diagram showing an operation state when the air conditioner is operated at a low outside temperature and a low load condition.

  By using the configuration of the outdoor unit 1 described with reference to FIG. 1, the usage as shown in FIG. 3 is also possible. The configuration of the outdoor unit 1 shown in FIG. 3 is the same as that in FIG. When the air conditioner is air-cooled under a condition of low outside air temperature and low air conditioning load, in the operation state shown in FIG. 2, simply closing the open / close damper 23 with a small angle closes the outdoor heat exchanger 15. In some cases, the condensation capacity cannot be suppressed, and the condensation capacity in the outdoor heat exchanger 14 becomes excessive.

  In this case, it is necessary to further suppress the condensation capacity in the outdoor heat exchanger 14. Therefore, when it is determined that the load is smaller than a predetermined reference based on the outside air temperature detected by the outside air thermistor 16 and the condensing pressure detected by the pressure sensor 17, the operation of the outdoor fan 15 is performed. And the angle of the open / close damper 23 is controlled horizontally as in FIG. Specifically, when the outside air temperature and the condensation pressure are smaller than a predetermined reference (the temperature detected by the outside air thermistor 16 is lower than the predetermined temperature, and the condensation pressure detected by the pressure sensor 17 is When the pressure is smaller than a predetermined pressure), the operation of the outdoor fan 15 is stopped and the opening / closing damper 23 is opened.

  When the air conditioner is operated under a low outdoor temperature and a low load condition, the surface of the outdoor heat exchanger 14 becomes hot due to the high-temperature and high-pressure refrigerant flowing through the outdoor heat exchanger 14, which is shown in FIG. By setting the control state, the air blown by the outdoor fan 11 is eliminated, and the air introduced into the suction port hood 3 from the outside air inlet 32 as indicated by an arrow is naturally convected, thereby causing the outdoor heat exchanger 14 to flow. It is discharged from the discharge port 22 to the outside. At this time, the outdoor heat exchanger 14 can perform heat exchange between the outside air flowing by natural convection and the refrigerant flowing in the heat exchanger. This heat exchange amount can be adjusted by adjusting the angle of the open / close damper 23 to adjust the flow rate of the air discharged from the discharge port 22, and the condensation capacity can be adjusted.

  Next, control of the outdoor unit of the air conditioner according to the first embodiment will be described with reference to FIG. FIG. 4 is a flowchart for explaining a control flow in the outdoor unit of the air conditioner shown in FIG. In the control shown in FIG. 4, control for switching the operation state shown in FIGS. 1 and 2 will be described. In the first embodiment, detection signals from the outside air thermistor 16, the pressure sensor 17, and the blowout thermistor 24 are sent to the control device provided in the electrical component box 18, and based on these information, The control device is configured to control the outdoor fan 15 and the open / close damper 23. That is, the outdoor fan 15 and the opening / closing damper 23 are controlled by one control device provided in the outdoor unit 1.

  In the flowchart shown in FIG. 4, when the cooling operation of the air conditioner is started, in step 101, the outside air condition is determined using the detected temperature in the outside air thermistor 16 as a threshold value at a predetermined temperature (10 ° C. in this example). In this step 101, when the outside air temperature is higher than 10 ° C., it is determined as a high outside air condition, and the control A under the high outside air operation condition is selected and controlled. When the outside air temperature is 10 ° C. or less, the low outside air condition And the control B under the low outside air operation condition is selected and controlled.

  When the control A under the high outdoor air operating condition is selected, in step 201, the open / close damper 23 is fully opened (90 °), and in the next step 202, the fan motor 15a of the outdoor fan 15 is set at a predetermined initial rotational speed. Start driving. Thereafter, in steps 203 and 204, the relationship between the condensation pressure detected by the pressure sensor 17 and the target pressure is determined. The control constant α in these steps 203 and 204 is an allowable deviation when the condensation pressure in the outdoor heat exchanger 14 is feedback-controlled by the rotation speed of the fan motor 15a.

  In step 203, if the detected value of the pressure sensor 17 is less than “target pressure−allowable deviation α”, the condensation pressure is too low. Therefore, in step 206, the rotational speed of the fan motor 15a is lower than the minimum rotational speed. If it is in a high state, the routine proceeds to step 208, where the rotational speed of the fan motor 15a is decreased.

  In step 204, if the detected value of the pressure sensor is higher than “target pressure + allowable deviation α”, the condensing pressure is too high. If it is determined in step 205 that the fan motor speed is less than the maximum speed, step Moving to 207, the fan motor speed is increased.

  After changing the fan motor rotation speed in the step 207 or 208, or when the fan motor rotation speed is the maximum rotation speed in the step 205, the process proceeds to step 209, and during the predetermined control cycle a, the current fan The motor rotational speed is maintained, and then the control returns to step 203 again during the cooling operation and the same control is repeated.

  When the control B under the low outside air operation condition is selected in the determination of step 101, the operation starts at step 301 with the fan motor 15a set to the minimum number of revolutions and at the next step 302 with the opening / closing damper 23 set to the initial angle. To do. Thereafter, in steps 303 and 304, the relation between the condensation pressure detected by the pressure sensor 17 and the target pressure is determined. The control constant β in these steps 303 and 304 is an allowable deviation when the condensation pressure in the outdoor heat exchanger 14 is feedback controlled by opening / closing the opening / closing damper 23.

  In step 303, if the detected value of the pressure sensor 17 is larger than “target pressure + allowable deviation β”, the condensing pressure is too high. Therefore, in step 306, the angle of the open / close damper 23 is fully open (90 °). If the angle is smaller than that, the process proceeds to step 308, and then to step 308, the angle of the open / close damper 23 is increased.

  If the detected value of the pressure sensor 17 is smaller than “target pressure−allowable deviation β” in step 304, the condensation pressure is too low. If the opening / closing damper 23 is larger than the minimum angle in the determination in step 305, In step 307, the angle of the open / close damper 23 is decreased.

  After changing the angle of the open / close damper 23 in the step 307 or 308, or when the angle of the open / close damper 23 is the minimum angle in the step 305, the process proceeds to step 309 and the current open / close damper angle during the control cycle b. After that, during the cooling operation, the process returns to Step 303 again and the same control is repeated.

  In the control A under the high outside air operation condition, when the fan motor rotation speed is the minimum rotation speed in the step 206, it is determined that the control for increasing the condensation pressure by the fan motor rotation speed is impossible, and the low A transition is made to control B under outdoor air operating conditions, and feedback control by the open / close damper 23 is started from step 303.

  On the other hand, in the control B of the low outside air operating condition, when the angle of the open / close damper 23 is fully open (90 °) in the step 306, it is determined that the control for reducing the condensation pressure by the open / close damper 23 is impossible. Then, a transition is made to the control state A under the high outside air operation condition, and feedback control based on the fan motor rotational speed is started from step 203.

  In the above control, the allowable deviation α and the allowable deviation β, and the control cycle a and the control cycle b are preferably set to optimum values in the respective control states, but the same values may be used.

  In the control shown in FIG. 4, at the start of the cooling operation, in step 101, it is determined whether the control A under the high outside air operation condition is selected by the outside air thermistor 16 or the control B under the low outside air operation condition is selected. However, during the operation after the start of the cooling operation, the control A and the control B are changed according to the detection value of the pressure sensor 17. In the control B under the low outside air operation condition, as shown in FIG. 2, the angle of the open / close damper 23 is controlled so that a part of the warm air coming out from the blowout port 13 is passed through the bypass flow path 40. Therefore, the outside air thermistor 16 detects the temperature of the air in which the air recirculated from the outlet 13 and the outside air flowing in from the outside air inlet 32 are mixed. For this reason, the outside air thermistor 16 cannot detect the outside air temperature.

  If the outside air thermistor 16 is installed near the outside air inlet 32 or another outside thermistor is provided outside the outdoor unit 1, the outside air temperature can always be detected. Even after the cooling operation is started, the transition condition between the control A and the control B can be determined based on the outside air temperature.

  In the control shown in FIG. 4, the control for switching the operation state shown in FIGS. 1 and 2 has been described. However, the operation state shown in FIG. 3 can be further incorporated into this control. For example, if the detected value of the pressure sensor 17 is smaller than “target pressure−allowable deviation β” (when the condensing pressure is too low) in step 304 in the control B shown in FIG. In addition, the determination using the allowable deviation δ larger than the allowable deviation β is performed. That is, when the detected value of the pressure sensor 17 is smaller than “target pressure−allowable deviation δ”, the outdoor fan 15 is stopped and the opening / closing damper 23 is controlled to open, and the operation shown in FIG. State. In addition, what is necessary is just to comprise so that it may move to the said step 305, when the detected value of the pressure sensor 17 is more than "target pressure-allowable deviation (delta)."

  Next, another example of the control of the outdoor unit of the air conditioner according to the first embodiment will be described with reference to FIG. FIG. 5 is a flowchart for explaining another control flow different from FIG. The control shown in FIG. 5 is the same as the control shown in FIG. 4 in that the control for switching the operation state shown in FIGS. 1 and 2 is performed. However, in the control shown in FIG. 5, in addition to the control device in the electrical component box 18 provided in the outdoor unit 1, the air outlet hood 2 is also provided with a control device. A control device provided in the air outlet hood 2 is attached to the front surface of the air outlet hood 2, etc., and a blow temperature signal detected by the air outlet thermistor 24 is input to the air outlet hood control device and detected. The opening degree of the open / close damper 23 is controlled according to the blown-out temperature.

  In the control example shown in FIG. 5, detection signals from the outside thermistor 16 and the pressure sensor 17 are sent to the control device in the electrical component box 18 provided in the outdoor unit 1, and the information is sent to these information. Based on this, the control device for the outdoor unit is configured to control the outdoor fan 15. That is, in the control shown in FIG. 5, a control device provided in the outdoor unit 1 and a control device provided in the outlet hood 2 are used, and the outdoor fan 15 is used in the control device provided in the outdoor unit 1. The control device provided in the outlet hood 2 controls the open / close damper 23.

The control C shown in FIG. 5 shows the control flow in the control device of the outdoor unit, and the control D shows the control flow in the control device of the outlet hood 2.
First, the control C in the outdoor unit controller will be described.
In the control C, when the cooling operation of the air conditioner is started, in step 102, a signal (operation start signal) indicating that the operation of the outdoor unit has started (the outdoor operation signal is ON) is sent to the outlet hood. Sent to the control device. In Step 103, similarly, a signal indicating that the cooling operation has started (the cooling operation signal is ON) is transmitted to the control device of the blower outlet hood 2. Next, in step 402, the fan motor 15a is started to operate at the initial rotational speed. Thereafter, in steps 403 and 404, the relationship between the condensation pressure detected by the pressure sensor 17 and the target pressure is determined.

  If the detected value of the pressure sensor 17 is less than “target pressure−allowable deviation α” in step 403, the condensation pressure is too low, and the process proceeds to step 406, where is the rotational speed of the fan motor 15 a higher than the minimum rotational speed? Determine whether or not. When the rotation speed is higher than the minimum rotation speed, the routine proceeds to step 408, where the rotation speed of the fan motor 15a is decreased.

  If the detected value of the pressure sensor 17 is higher than “target pressure + allowable deviation α” in step 404, the condensation pressure is too high, and the routine proceeds to step 405 where the fan motor rotational speed is less than the maximum rotational speed. It is determined whether or not. When the rotational speed is less than the maximum rotational speed, the routine proceeds to step 407 to increase the rotational speed of the fan motor.

  If the fan motor speed is changed in step 407 or 408, if the fan motor speed is the highest speed in step 405, and if the fan motor speed is the lowest speed in step 406, step 409 Then, during the control cycle c, the current fan motor speed is maintained, and then the control from step 403 is repeated during the cooling operation.

  Next, the control D in the control device for the outlet hood 2 will be described. The control device for the air outlet hood 2 is connected to the control device for the outdoor unit 1 through a signal line, and the operation of the outdoor unit 1 is controlled from the control device for the outdoor unit 1 to the control device for the air outlet hood 2. Is turned on (outdoor operation signal = ON), and a signal that cooling operation is started (cooling operation signal = ON) is transmitted.

  In the control D, when the operation of the air conditioner is started, in step 104, the presence or absence of an outdoor operation signal from the control device of the outdoor unit 1 is determined. If there is no outdoor operation signal, the determination in step 104 is performed. repeat. When there is an outdoor operation signal (when the operation of the outdoor unit is started), the process proceeds to step 502, the opening / closing damper 23 is fully opened (90 °), and the process proceeds to step 105.

  In this step 105, it is determined whether or not there is a cooling operation signal from the control device of the outdoor unit 1, and if there is no cooling operation signal, it is determined in step 106 whether or not the outdoor operation signal is in an ON state. If so, the process proceeds to step 502, and the same determination is repeated thereafter. If the outdoor operation signal is not ON in step 106, it is determined that the outdoor unit 1 has been stopped, the process proceeds to step 107, and the opening / closing damper 23 is fully closed (0 °). The control D is also stopped and finished.

  In step 105, if there is a cooling operation signal, the relationship between the blown air temperature detected by the blowout thermistor 24 and the target temperature is determined in steps 503 and 504. This target temperature is determined in accordance with the target pressure of the condensation pressure in the control C in the control unit for the outdoor unit. The control constant γ in these steps 503 and 504 is an allowable deviation when feedback control of the blowing temperature is performed by the open / close damper.

  If the detected value of the blow-off thermistor 24 is higher than “target temperature + allowable deviation γ” in step 503, the condensation temperature in the outdoor heat exchanger 14 is too high. It is determined that the opening is not fully open (90 °). If the opening is not fully open, the process proceeds to step 508 to increase the angle of the open / close damper 23.

  If the detected value of the blow-off thermistor 24 is lower than “target temperature−allowable deviation γ” in step 504, the condensation temperature in the outdoor heat exchanger 14 is too low. It is determined that the opening degree is not the minimum opening degree. If the opening degree is not the minimum opening degree, the process proceeds to step 507 to reduce the angle of the opening / closing damper 23.

  If the angle of the open / close damper 23 is changed in step 507 or 508, if the open / close damper 23 is at the minimum angle as determined in step 505, and if the open / close damper 23 is fully open as determined in step 506, step 509 Then, during the control cycle d, the current opening / closing damper angle is maintained, and thereafter, the process proceeds to step 105, and the same control is repeated as long as there is a cooling operation signal from the control device of the outdoor unit 1.

  By controlling as shown in FIG. 5, the fan motor 15 a is controlled by the outdoor unit 1 by transmitting an outdoor operation signal and a cooling operation signal from the control unit of the outdoor unit 1 to the control device of the outlet hood 2. With the device, the open / close damper 23 can be individually controlled with a simple feedback by the control device of the outlet hood 2. Therefore, by adopting the control shown in FIG. 5, the outlet hood 2 and the suction hood 3 can be retrofitted to the outdoor unit 1, and the outdoor unit 1 generally does not include a hood. The effect which can be shared with a typical outdoor unit is obtained.

  According to the present embodiment described above, it is possible to obtain an outdoor unit of an air conditioner that can achieve a cooling operation under a low outside air condition and can also reduce costs and simplify control.

  In addition, this invention is not limited to the Example mentioned above, Various modifications are included. The above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.

DESCRIPTION OF SYMBOLS 1 ... Outdoor unit, 11 ... Housing | casing, 12 ... Inlet, 13 ... Air outlet, 14 ... Outdoor heat exchanger,
15 ... outdoor fan, 15a ... fan motor,
16 ... Outside thermistor (outside temperature detector), 17 ... Pressure sensor (pressure detector),
18 ... Electrical box,
2 ... Blowout hood, 21 ... Snowproof top plate, 22 ... Discharge port,
23 ... Opening / closing damper, 23a-23c ... Blades,
24 ... Blowout thermistor (Blowout air temperature detector),
3 ... Suction hood, 31 ... Side wall for wind protection, 32 ... Outside air inlet,
40: Bypass channel.

Claims (12)

A housing, an air outlet provided in an upper portion of the housing, a suction port provided in a side surface of the housing, an outdoor heat exchanger provided corresponding to the suction port, and the suction port An outdoor unit of an air conditioner having an outdoor fan that sends sucked air to the outlet,
A blower outlet hood covering the upper part of the blower outlet;
An exhaust port provided in the air outlet hood and for blowing out the air blown from the air outlet to the outside of the air outlet hood,
An open / close damper that opens and closes the opening of the discharge port;
A bypass channel provided on the side of the housing on the same side as the discharge port, and by operating the opening / closing damper in a closing direction to guide the air blown from the blowout port to flow to the suction port; An outdoor unit for an air conditioner, comprising:   The outdoor unit of an air conditioner according to claim 1, further comprising an inlet hood provided so as to cover the inlet, the outlet hood being in communication with the bypass channel, and an outside air An outdoor unit for an air conditioner, comprising an outdoor air inlet that guides the air to the outdoor heat exchanger.   It is an outdoor unit of the air conditioner of Claim 2, Comprising: The said outlet hood and the said suction inlet hood are integrally formed, The outdoor unit of the air conditioner characterized by the above-mentioned.   It is an outdoor unit of the air conditioner of Claim 3, Comprising: The said bypass is connected to the connection part of the said blower outlet hood and the said suction inlet hood from the lower part of the said discharge outlet in the said suction inlet hood. An outdoor unit of an air conditioner, characterized in that a flow path is provided.   2. The outdoor unit of the air conditioner according to claim 1, wherein the opening / closing damper is configured to blow air blown from the outdoor fan to the outside from the discharge port, to block the discharge port, and from the outdoor fan. An outdoor unit of an air conditioner configured to be controllable to a state in which blown air is guided to the suction port via the bypass flow path.   The outdoor unit of an air conditioner according to claim 1, further comprising a pressure detector that detects a condensation pressure of the heat exchanger, wherein the open / close damper is based on the condensation pressure detected by the pressure detector. An outdoor unit of an air conditioner characterized in that opening and closing is controlled.   It is an outdoor unit of the air conditioner of Claim 6, Comprising: The outdoor unit of the air conditioner provided with the outdoor temperature detector which detects outdoor temperature.   The outdoor unit of an air conditioner according to claim 7, further comprising a blown air temperature detector that detects a temperature of air blown from the blowout port, wherein the opening / closing damper is detected by the blown air temperature detector. The outdoor unit of an air conditioner, whose opening and closing is controlled based on the blown-out temperature.   The outdoor unit of an air conditioner according to claim 7, wherein when the temperature detected by the outdoor temperature detector is higher than a predetermined temperature, the outdoor heat exchanger detected by the pressure detector. The number of rotations of the outdoor fan is controlled according to the condensation pressure, and when the temperature detected by the outdoor temperature detector is equal to or lower than a predetermined temperature, the condensation of the outdoor heat exchanger detected by the pressure detector An indoor unit of an air conditioner, wherein opening and closing of the open / close damper is controlled according to pressure. The outdoor unit of an air conditioner according to claim 8, comprising a control device for the outdoor unit that controls the outdoor heat exchanger unit, and a control device for the blowout hood that controls the blowout hood,
The control unit of the outdoor unit controls the rotational speed of the outdoor fan according to the condensation pressure of the outdoor heat exchanger detected by the pressure detector,
The air conditioner indoor unit is characterized in that the blower hood control device controls the opening and closing of the open / close damper according to the blown air temperature detected by the blown air temperature detector.   The outdoor unit of an air conditioner according to claim 1, wherein when the load is smaller than a predetermined reference, the outdoor fan is controlled to be stopped and the open / close damper is opened. Air conditioner outdoor unit. The outdoor unit for an air conditioner according to claim 11, comprising an outdoor air temperature detector for detecting an outdoor air temperature, and a pressure detector for detecting a condensation pressure of the heat exchanger,
Based on the outside air temperature detected by the outside air temperature detector and the condensation pressure detected by the pressure detector, when it is determined that the load is smaller than a predetermined reference, the outdoor fan is stopped and An outdoor unit of an air conditioner that is controlled to open the opening / closing damper.

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