JP2009287833A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner capable of further enhancing heating feeling provided for a user inexpensively. <P>SOLUTION: The air conditioner is provided with a cabinet 3 covering an indoor unit 2 arranged in an indoor space; an air fan 7 arranged within the cabinet 3 and generating an air flow; a suction port 4 taking indoor air into the cabinet 3 by drive of the air fan 7; an indoor heat exchanger 9 arranged between the air fan 7 and the suction port 4 and having a refrigerant flowing by the operation of a refrigeration cycle; a blow-out port 5 for blowing out air which is heat-exchanged with the indoor heat exchanger 9 by the drive of the air fan 7; and an opening/closing mechanism 30 for opening and closing a flow passage of air guided to the downstream of the indoor heat exchanger 9 via the suction port 4. The air conditioner has a normal heating operation mode for performing heating operation with the opening/closing mechanism 30 opened and a high temperature heating operation mode for performing heating operation with the opening/closing mechanism 30 closed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an air conditioner that performs a heating operation.

  FIG. 6 is a side sectional view showing an indoor unit of a conventional air conditioner. The indoor unit 2 of the air conditioner 1 is covered with a cabinet 3 attached to the indoor wall surface. A suction port 4 is provided on the upper surface of the cabinet 3. A substantially rectangular air outlet 5 extending in the width direction of the indoor unit 2 is formed at the lower end of the front side of the cabinet 3.

  Inside the indoor unit 2, a ventilation path 6 that communicates from the inlet 4 to the outlet 5 is formed. A blower fan 7 that sends out air is disposed in the blower path 6. An air filter 8 that collects dust contained in the air sucked from the suction port 4 is provided in the vicinity of the suction port 4. A lateral louver 11 that varies the wind direction in the vertical direction is provided in the vicinity of the air outlet 5 in the air blowing path 6.

  An indoor heat exchanger 9 is disposed between the blower fan 7 and the air filter 8 in the blower path 6. The indoor heat exchanger 9 is connected to a compressor, a four-way valve, an expansion valve, and an outdoor heat exchanger (all not shown) provided in an outdoor unit (not shown), and is connected to a refrigerant pipe through which refrigerant flows to constitute a refrigeration cycle. is doing.

  In the air conditioner having the above configuration, when the operation of the air conditioner is started, the compressor is driven, and the refrigerant from the outdoor unit flows to the indoor heat exchanger 9. During the heating operation, the indoor heat exchanger 9 is arranged on the high temperature side of the refrigeration cycle, and the outdoor heat exchanger is arranged on the low temperature side. During the cooling operation, the indoor heat exchanger 9 is arranged on the low temperature side of the refrigeration cycle, and the outdoor heat exchanger is arranged on the high temperature side.

  When the blower fan 7 is driven, air is sucked into the indoor unit 2 from the suction port 4, and dust contained in the air is removed by the air filter 8. The air taken into the indoor unit 2 exchanges heat with the indoor heat exchanger 9, and is heated or cooled. Then, the direction is regulated in the vertical direction by the horizontal louver 11 through the air blowing path 6, and conditioned air is sent out from the air outlet 5 into the room.

JP-A-2-171519 (first page-second page, Fig. 3)

  According to the conventional air conditioner 1 described above, the suction port 4 is greatly opened in order to reduce resistance when air is sucked into the indoor unit 2. As a result, air is efficiently sucked into the indoor unit 1 and passes through the indoor heat exchanger 9 uniformly, and the refrigerant in the indoor heat exchanger 9 efficiently dissipates heat during the heating operation. At the same time, the air sucked from the suction port 4 is heated by heat exchange with the indoor heat exchanger 9.

  During the heating operation, the refrigerant in the indoor heat exchanger 9 changes from the superheated state at the time of inflow to the supercooled state at the time of outflow through the two-phase region. Thereby, the temperature of the refrigerant | coolant in the indoor heat exchanger 9 falls greatly, for example from about 80 degreeC to about 40 degreeC. On the other hand, the air sucked from the suction port 4 is heated to, for example, around 50 ° C. and sent out from the blower outlet 5.

  At the start of the heating operation or the like, the feeling of heating given to the user can be increased by sending hotter air from the outlet 5 to improve comfort. For this reason, Patent Literature 1 discloses an air conditioner including two blower fans. According to this air conditioner, normal heating operation is performed by two blower fans, and one of the blower fans is stopped to perform higher temperature heating operation.

  Thereby, the air volume at the time of high temperature heating operation is reduced, the heat exchange amount per unit air volume with an indoor heat exchanger is increased, and high temperature air is blown out. In addition, warm air can reach the floor without reducing the wind speed. However, since this air conditioner requires a plurality of blower fans, there is a problem that the cost of the air conditioner increases.

  On the other hand, when the operating frequency of the compressor is increased, the pressure and temperature are increased, and the degree of superheat of the refrigerant can be increased. Thereby, a refrigerant | coolant with a big superheat degree can be supplied to an indoor heat exchanger, and the average temperature of the indoor heat exchanger 9 can be raised. However, since the current capacity and the use conditions of the compressor are limited, the range of increase in the operating frequency of the compressor is limited.

  In addition, the indoor heat exchanger 9 is cooled to a two-phase region from the upstream portion on the refrigerant inflow side to the downstream portion on the refrigerant outflow side. Since the suction port 4 is greatly opened, the air taken into the cabinet is heat exchanged with the whole of the indoor heat exchanger 9 including the lowered downstream portion.

  For these reasons, there is a problem that the air blown out from the blowout port 5 cannot be sufficiently heated (for example, 60 ° C. or higher).

  An object of this invention is to provide the air conditioner which can make higher the feeling of heating given to a user at low cost.

  In order to achieve the above object, the present invention provides a cabinet that covers indoor units arranged indoors, a blower fan that is arranged in the cabinet and generates an air flow, and the indoor air is driven by the blower fan. A suction port that is taken in, an indoor heat exchanger that is arranged between the blower fan and the suction port and through which refrigerant flows by operation of a refrigeration cycle, and heat exchange with the indoor heat exchanger by driving the blower fan An air outlet that blows out the air into the room and an opening and closing mechanism that opens and closes a flow path of the air that is led to the downstream portion of the indoor heat exchanger via the suction port, and heating operation with the opening and closing mechanism open A first heating operation mode for performing heating and a second heating operation mode for performing heating operation with the opening / closing mechanism closed are provided.

  According to this configuration, the opening / closing mechanism is opened during the first heating operation, and indoor air is taken into the cabinet from the entire suction port by driving the blower fan. The air flowing in from the suction port exchanges heat with the entire indoor heat exchanger, and is sent out from the outlet. The opening / closing mechanism is closed during the second heating operation, and indoor air is taken into the cabinet from a part of the suction port by driving the blower fan. In the indoor heat exchanger, the overheated refrigerant flows, the high-temperature refrigerant flows in the upstream portion, and the temperature of the refrigerant is lowered while reaching the downstream portion. The flow path of the air led to the downstream part of the indoor heat exchanger is shielded by the opening / closing mechanism, and the air flowing in from the suction port exchanges heat with the upstream part of the indoor heat exchanger and is sent out from the outlet. The opening / closing mechanism may be provided inside the cabinet or may be provided outside the cabinet.

  In the air conditioner configured as described above, the temperature of the refrigerant flowing into the indoor heat exchanger is higher in the second heating operation mode than in the first heating operation mode. According to this configuration, in the second heating operation mode, the refrigerant having a higher degree of superheat than in the first heating operation mode flows into the indoor heat exchanger.

  In the air conditioner configured as described above, the indoor heat exchanger may be bent and disposed so as to cover the front and rear of the blower fan, and the suction port may be provided on an upper surface of the cabinet. The rear portion is opened and closed by the opening and closing mechanism.

  According to this configuration, the suction port is provided on the upper surface of the cabinet, and when the opening / closing mechanism is opened, air is guided to the indoor heat exchangers at the front and rear of the blower fan. When the rear portion of the suction port is closed by the opening / closing mechanism, air is guided to the indoor heat exchanger in front of the blower fan and the air flow path guided to the indoor heat exchanger behind is shut off.

  Moreover, in the air conditioner having the above-described configuration, the present invention is provided with a throttle portion that varies an opening area of the outlet, and reduces the amount of air blown by the blower fan in the second heating operation mode than in the first heating operation mode. In addition, the air outlet is narrowed by the throttle portion.

  According to this configuration, in the first heating operation mode, the throttle portion is opened, the air outlet is opened widely, and the air exchanged with the indoor heat exchanger is blown out. In the second heating operation mode, the opening of the air outlet is narrowed by the throttle portion, and the air heat-exchanged with the indoor heat exchanger at a low speed is blown out at the air outlet at an increased flow velocity.

  According to the present invention, in the air conditioner having the above-described configuration, the throttle portion is formed by a wind direction plate that varies a wind direction of air sent from the air outlet. According to this configuration, the air direction from the outlet is varied by the air direction plate during the first heating operation mode or the cooling operation. In the second heating operation mode, the opening of the air outlet is narrowed by the wind direction plate.

  In the air conditioner having the above-described configuration, the present invention is characterized in that a third heating operation mode is provided in which the first heating operation mode is performed continuously to the second heating operation mode. According to this configuration, when the third heating operation mode is started, the second heating operation mode is performed. When a predetermined condition is satisfied such as when a predetermined time has elapsed or when the room temperature has reached a predetermined temperature, the first heating operation mode is switched.

  According to the present invention, it is provided with an opening / closing mechanism that opens and closes an air passage that is led to the downstream portion of the indoor heat exchanger via the suction port, and the first heating operation mode is performed with the opening / closing mechanism opened, and the opening / closing mechanism is closed. In the state, the second heating operation mode is performed. Thereby, the air taken in from the suction port in the second heating operation mode is not exchanged with the downstream portion of the cooled indoor heat exchanger, but is exchanged with the upstream portion of the hot indoor heat exchanger and sent out. . Further, the amount of air exchanged with the indoor heat exchanger can be reduced, and the amount of heat exchange per unit air volume can be increased.

  Therefore, it is possible to increase the feeling of heating given to the user by increasing the blowing temperature at a low cost with a simple configuration. Further, in the first heating operation mode, a large amount of air is heated by exchanging heat with the whole indoor heat exchanger, and the heating efficiency can be maintained high.

  Embodiments of the present invention will be described below with reference to the drawings. For convenience of explanation, the same parts as those in the conventional example shown in FIG. Drawing 1 is a lineblock diagram showing the air harmony machine of one embodiment. The air conditioner 1 has an indoor unit 2 arranged indoors and an outdoor unit 20 arranged outdoors.

  The outdoor unit 20 is provided with a compressor 15, a four-way valve 16, an expansion valve 17, and an outdoor heat exchanger 18. The indoor unit 2 is provided with an indoor heat exchanger 9. One end of the outdoor heat exchanger 18 is connected to one end of the compressor 15 via the four-way valve 16 by the refrigerant pipe 22 through which the refrigerant flows, and one end of the indoor heat exchanger 9 is connected to the other end of the compressor 15. The The other ends of the outdoor heat exchanger 18 and the indoor heat exchanger 9 are connected via a refrigerant pipe 22 via an expansion valve 17.

  Accordingly, a refrigeration cycle is configured, and the refrigerant such as R410A flows through the refrigerant pipe 22 by driving of the compressor 15, and the refrigeration cycle is operated. During the cooling operation, the outdoor heat exchanger 18 is disposed on the high temperature side of the refrigeration cycle, and the indoor heat exchanger 9 is disposed on the low temperature side. During the heating operation, the indoor heat exchanger 9 is disposed on the high temperature side of the refrigeration cycle by switching the four-way valve 16, and the outdoor heat exchanger 18 is disposed on the low temperature side.

  FIG. 2 is a side sectional view of the indoor unit 2. The indoor unit 2 is covered with a cabinet 3. The cabinet 3 is provided with a claw portion (not shown) on the back surface, and is supported by fitting the claw portion to a mounting plate attached to an indoor wall W (see FIG. 1). A suction port 4 is provided on the upper surface of the cabinet 3. A substantially rectangular air outlet 5 extending in the width direction of the indoor unit 2 is formed at the lower end of the front side of the cabinet 3.

  Inside the indoor unit 2, a ventilation path 6 that communicates from the inlet 4 to the outlet 5 is formed. A blower fan 7 that generates an airflow is disposed in the blower path 6. For example, a cross flow fan or the like can be used as the blower fan 7. An air filter 8 that collects dust contained in the air sucked from the suction port 4 is provided in the vicinity of the suction port 4.

  A lateral louver 11 (wind direction plate) is provided in the vicinity of the air outlet 5 in the air blowing path 6. The horizontal louver 11 is rotatably supported by the shaft portion 11a, and varies the wind direction in the vertical direction from the air outlet 5. Moreover, if the one end of the horizontal louver 11 is disposed so as to be in contact with the upper surface of the air blowing path 6, the opening area of the outlet 5 can be reduced (see FIG. 4). Accordingly, the lateral louver 11 constitutes a throttle portion that varies the opening area of the blowout port 5.

  An indoor heat exchanger 9 is disposed between the blower fan 7 and the air filter 8 in the blower path 6. The indoor heat exchanger 9 is formed by attaching a large number of fins (not shown) for heat exchange to a refrigerant pipe 22 that meanders between flow path ends 9a and 9b through which refrigerant flows in and out. A four-way valve 16 (see FIG. 1) is connected to the front flow path end 9a, and an expansion valve 17 is connected to the rear flow path end 9b. In addition, the indoor heat exchanger 9 is bent so as to cover the front and rear of the blower fan 7.

  An opening / closing mechanism 30 is provided on the upper surface of the cabinet 3. The opening / closing mechanism 30 is pivotally supported by a shaft portion 30a and rotates between a position where the rear portion of the suction port 4 is closed and a position where it is opened. Thereby, the flow path of the air led to the rear part of the indoor heat exchanger 9 through the suction port 4 is opened and closed.

  In the air conditioner 1 having the above configuration, the refrigerant flows from the flow path end 9b of the indoor heat exchanger 9 toward the flow path end 9a by switching the four-way valve 16 during the cooling operation. Thereby, the indoor heat exchanger 9 is arranged on the low temperature side of the refrigeration cycle. As shown in FIG. 3, the opening / closing mechanism 30 is opened, and indoor air is taken into the cabinet 3 from the entire inlet 4 as indicated by an arrow A <b> 1 by driving the blower fan 7.

  The air that has flowed into the cabinet 3 is subjected to heat exchange with the indoor heat exchanger 9 to be cooled. The air that has exchanged heat with the indoor heat exchanger 9 flows through the blower path 6 and is sent out in a predetermined direction from the outlet 5 as indicated by an arrow A2.

  The heating operation includes a normal heating operation mode (first heating operation mode), a high temperature heating operation mode (second heating operation mode), and a continuous heating operation mode (third heating operation mode). In the normal heating operation mode, warm air is sent out from the outlet 5 to perform normal heating operation. In the high-temperature heating operation mode, air that is hotter than the normal heating operation mode is sent out. In the continuous heating operation mode, the normal heating operation mode is performed after the high temperature heating operation mode. Each mode can be switched by the user by operating a remote controller (not shown).

  During the heating operation, the refrigerant flows from the flow path end 9a of the indoor heat exchanger 9 toward the flow path end 9b by switching the four-way valve 16. Thereby, the indoor heat exchanger 9 is arranged on the high temperature side of the refrigeration cycle.

  In the normal heating operation mode, as shown in FIG. 3, the opening / closing mechanism 30 is opened, and the air is taken into the cabinet 3 from the entire inlet 4 as indicated by the arrow A <b> 1 by driving the blower fan 7. The air flowing into the cabinet 3 is heated by exchanging heat with the indoor heat exchanger 9. The air that has exchanged heat with the indoor heat exchanger 9 flows through the ventilation path 6 and is sent out from the outlet 5 in a predetermined direction in the room as indicated by an arrow A2. Thereafter, when the indoor temperature increases, the operating frequency of the compressor 15 is lowered, and when the indoor temperature decreases, the operating frequency of the compressor 15 is increased and the heating operation is continued.

  In the high temperature heating operation mode, the compressor 15 is driven at a higher operating frequency than in the normal heating operation mode. As a result, the degree of superheat of the refrigerant increases, and the temperature of the refrigerant discharged from the compressor 15 is raised to, for example, 100 ° C., compared to 85 ° C. in the normal heating operation mode.

  As shown in FIG. 4, the opening / closing mechanism 30 is closed, and indoor air is taken into the cabinet 3 from the front of the suction port 4 as indicated by arrow A <b> 3 by driving the blower fan 7. Thereby, the amount of air led to the indoor heat exchanger 9 is reduced as compared with the normal heating operation mode. Moreover, the rotation speed of the ventilation fan 7 is smaller than the normal heating operation mode. Thereby, the amount of air led to the indoor heat exchanger 9 is further reduced.

  The air flowing into the cabinet 3 is heated by exchanging heat mainly with the front portion of the indoor heat exchanger 9. At this time, in the indoor heat exchanger 9, a refrigerant having a high degree of superheat flows and the temperature of the upstream upstream portion increases, and the downstream downstream portion becomes supercooled due to heat dissipation, so the temperature decreases. The flow path of the air led to the downstream part of the indoor heat exchanger 9 is closed by the opening / closing mechanism 30, and the air flowing into the cabinet 3 exchanges heat with the high temperature upstream part of the indoor heat exchanger 9.

  The air that has exchanged heat with the indoor heat exchanger 9 flows through the ventilation path 6 and is guided to the outlet 5 as indicated by an arrow A4. At this time, the air outlet 5 is throttled by the horizontal louver 11, and high-temperature air whose flow velocity is increased by the air outlet 5 having a narrow opening area is sent into the room. The lateral louver 11 is formed so as to guide the airflow directly downward when one end of the lateral louver 11 is in contact with the upper wall of the air blowing path 6 and the air outlet 5 is narrowed. Thereby, warm air can be made to reach the floor while maintaining the same wind speed as in the normal heating operation mode. And heating operation is continued in the state where the operating frequency of the compressor 15 is high. At this time, when the room temperature reaches a predetermined upper limit temperature, the operating frequency of the compressor 15 is lowered or stopped for safety.

  FIG. 5 is a flowchart showing the operation in the continuous heating operation mode. If there is an instruction to start the continuous heating operation mode, the high temperature heating operation mode is performed in step # 11. In step # 12, it is determined whether or not a predetermined time has elapsed by a timer provided in the indoor unit 2 or the remote controller.

  When the predetermined time has elapsed, the process proceeds to step # 14, and when the predetermined time has not elapsed, the process proceeds to step # 13. In step # 13, it is determined whether or not the room temperature has become equal to or higher than the set temperature by a temperature sensor provided in the remote controller. When the room temperature becomes equal to or higher than the set temperature, the process proceeds to step # 14. If the room temperature is not equal to or higher than the set temperature, steps # 12 and # 13 are repeated.

  When the predetermined time has elapsed or the room temperature becomes equal to or higher than the set temperature, the high-temperature heating operation mode is stopped in step # 14. In step # 15, the normal heating operation mode is performed.

  According to this embodiment, the opening / closing mechanism 30 that opens and closes the rear portion of the suction port 4 is provided, the normal heating operation mode (first heating operation mode) is performed with the opening / closing mechanism 30 opened, and the opening / closing mechanism is closed and the high temperature is maintained. A heating operation mode (second heating operation mode) is performed. As a result, the air taken in from the suction port 4 during the high-temperature heating operation mode is not heat-exchanged with the downstream portion of the cooled indoor heat exchanger 9, but is exchanged with the upstream portion of the high-temperature indoor heat exchanger 9 and sent out. Is done. Further, the amount of air exchanged with the indoor heat exchanger 9 can be reduced, and the amount of heat exchange per unit air volume can be increased.

  Therefore, it is possible to increase the feeling of heating given to the user by increasing the blowing temperature at a low cost with a simple configuration. Further, in the normal heating operation mode, a large amount of air is heat-exchanged with the whole indoor heat exchanger 9 to be heated, and the heating efficiency can be kept high.

  In the high-temperature heating operation mode, the operating frequency of the compressor 15 is increased to increase the degree of superheat, and the temperature of the refrigerant flowing into the indoor heat exchanger 9 is set higher than that in the normal heating operation mode. Thereby, blowing temperature can be made high easily.

  Further, in the high-temperature heating operation mode, the rotational speed of the blower fan 7 is made lower than that in the normal heating operation mode, and the opening area of the outlet 5 is narrowed by the throttle portion composed of the lateral louvers 11, so the air volume is reduced. The amount of heat exchange per unit air volume can be further increased. Moreover, the flow velocity of the air blown out from the blower outlet 5 can be increased to allow warm air to reach the floor surface.

  In addition, since the throttle portion is formed by the horizontal louver 11 that changes the air direction of the air outlet 5, the number of parts can be reduced.

  Moreover, since the continuous heating operation mode (third heating operation mode) is provided, high-temperature air is blown out by the high-temperature heating operation mode at the start of operation, and a high feeling of heating can be given to the user. And since it switches to normal heating operation mode on predetermined conditions, a user cannot be exposed to excessively high temperature warm air, and comfort can be improved.

  In the present embodiment, the opening / closing mechanism 30 is provided on the outer side of the cabinet 3, but may be provided on the inner side. That is, the same effect can be obtained if the air flow path led to the downstream portion of the indoor heat exchanger 9 through the suction port 4 is opened and closed by the opening / closing mechanism 30. Further, the suction port 4 may be provided on the front surface of the cabinet 3.

  Moreover, like this embodiment, the indoor heat exchanger 9 is bent and arranged so as to cover the front and rear of the blower fan 7, and the suction port 4 is provided on the upper surface of the cabinet 3 to open and close the rear part of the suction port 4. When the mechanism 30 is opened and closed, the flow path of the air guided to the downstream portion of the indoor heat exchanger 9 can be easily opened and closed. Furthermore, since the opened / closed mechanism 30 is less visible, the aesthetics of the indoor unit 2 can be improved.

  Examples of the present invention will be described below. Table 1 shows the results of examining the temperature of the air blown from the outlet 5 in the normal heating operation mode and the high temperature heating operation mode by the air conditioner 1 of the above embodiment. The heating capacity of the compressor 15 is 3.6 kW, and the refrigerant is R410A. In addition, the measurement is performed under conditions of an indoor temperature of 20 ° C and an outside air temperature of 2 ° C. For comparison, Comparative Examples 1 to 3 in a state in which the opening / closing mechanism 30 is opened and the throttle portion by the lateral louver 11 is opened are shown side by side.

In the normal heating operation mode, the opening / closing mechanism 30 is opened, and the throttle portion by the lateral louver 11 is opened. Further, the rotational speed of the blower fan 7 is 1300 rpm, the air volume at the outlet 5 is 10.0 m ³ / min, and the temperature of the refrigerant discharged from the compressor 15 is 84.0 ° C. Thereby, the refrigerant | coolant temperature of the flow-path ends 9a and 9b of the indoor heat exchanger 9 is set to 75.4 degreeC and 27.2 degreeC, respectively, and the blowing temperature of the blower outlet 5 is 50.5 degreeC.

In the high-temperature heating operation mode, the opening / closing mechanism 30 is closed, and the air outlet 5 is throttled by the throttle portion by the lateral louver 11. Further, the rotational speed of the blower fan 7 is 845 rpm, the air volume at the outlet 5 is 4.6 m ³ / min, and the temperature of the refrigerant discharged from the compressor 15 is 100.9 ° C. Thereby, the refrigerant | coolant temperature of the flow-path ends 9a and 9b of the indoor heat exchanger 9 is 88.7 degreeC and 46.6 degreeC, respectively, and the blowing temperature of the blower outlet 5 is 64.5 degreeC.

In Comparative Example 1, the opening / closing mechanism 30 is opened, and the throttle portion by the lateral louver 11 is opened. Moreover, the rotation speed of the blower fan 7 is 1045 rpm, the air volume of the blower outlet 5 is 7.5 m ³ / min, and the temperature of the refrigerant discharged from the compressor 15 is 100.7 ° C. Thereby, the refrigerant | coolant temperature of the flow-path ends 9a and 9b of the indoor heat exchanger 9 will be 91.0 degreeC and 30.4 degreeC, respectively, and the blowing temperature of the blower outlet 5 will be 58.0 degreeC.

In Comparative Example 2, the opening / closing mechanism 30 is opened, and the throttle portion by the lateral louver 11 is opened. Further, the rotational speed of the blower fan 7 is 845 rpm, the air volume at the outlet 5 is 5.5 m ³ / min, and the temperature of the refrigerant discharged from the compressor 15 is 100.5 ° C. Thereby, the refrigerant | coolant temperature of the flow-path ends 9a and 9b of the indoor heat exchanger 9 is 89.0 degreeC and 35.6 degreeC, respectively, and the blowing temperature of the blower outlet 5 is 61.0 degreeC.

In Comparative Example 3, the opening / closing mechanism 30 is opened, and the throttle portion by the lateral louver 11 is opened. Moreover, the rotation speed of the blower fan 7 is 645 rpm, the air volume of the blower outlet 5 is 3.5 m ³ / min, and the temperature of the refrigerant discharged from the compressor 15 is 97.6 ° C. Thereby, the refrigerant | coolant temperature of the flow-path ends 9a and 9b of the indoor heat exchanger 9 will be 83.3 degreeC and 42.1 degreeC, respectively, and the blowing temperature of the blower outlet 5 will be 61.4 degreeC.

  That is, in Comparative Examples 1 to 3, even if the temperature of the refrigerant discharged from the compressor 15 is increased to about 100 ° C. and the air volume is reduced, the temperature rise of the blown air is limited to about 61.4 ° C. In contrast, in the present embodiment, the temperature of the blown air can be increased to 64.5 ° C. by providing the opening / closing mechanism 30. Therefore, the temperature of the blown air can be increased more than before by the high temperature heating operation mode.

  The present invention can be applied to household and commercial air conditioners that perform heating operation.

The block diagram which shows the air conditioner of embodiment of this invention Side surface sectional drawing which shows the indoor unit of the air conditioner of embodiment of this invention Side surface sectional drawing which shows the state at the time of the normal heating operation mode of the indoor unit of the air conditioner of embodiment of this invention Side surface sectional drawing which shows the state at the time of the high temperature heating operation mode of the indoor unit of the air conditioner of embodiment of this invention The flowchart which shows the operation | movement at the time of the continuous heating operation mode of the indoor unit of the air conditioner of embodiment of this invention. Side sectional view showing an indoor unit of a conventional air conditioner

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Indoor unit 3 Cabinet 4 Suction inlet 5 Outlet 6 Blower path 7 Blower fan 8 Air filter 9 Indoor heat exchanger 9a, 9b Channel end 11 Horizontal louver 15 Compressor 16 Four-way valve 17 Expansion valve 18 Outdoor heat Exchanger 20 Outdoor unit 22 Refrigerant pipe 30 Opening / closing mechanism

Claims (6)

  A cabinet that covers indoor units arranged indoors, a blower fan that is arranged in the cabinet and generates an air flow, a suction port that takes indoor air into the cabinet by driving the blower fan, and the blower fan, An indoor heat exchanger that is arranged between the suction port and in which a refrigerant flows through the operation of a refrigeration cycle; a blowout port that blows out the air heat-exchanged with the indoor heat exchanger by driving the blower fan; and A first heating operation mode in which a heating operation is performed with the opening / closing mechanism opened, and an opening / closing mechanism that opens / closes an air flow path that is led to the downstream portion of the indoor heat exchanger via the suction port; The air conditioner characterized by providing the 2nd heating operation mode which performs heating operation in the state which closed the mechanism.   The air conditioner according to claim 1, wherein the temperature of the refrigerant flowing into the indoor heat exchanger is higher in the second heating operation mode than in the first heating operation mode.   The indoor heat exchanger is arranged to be bent so as to cover the front and rear of the blower fan, the suction port is provided on the upper surface of the cabinet, and the rear part of the suction port is opened and closed by the opening / closing mechanism. The air conditioner according to claim 1 or 2.   The throttle part which varies the opening area of the blower outlet is provided, and the blower outlet is narrowed by the throttle part while reducing the amount of air blown by the blower fan in the second heating operation mode than in the first heating operation mode. The air conditioner according to any one of claims 1 to 3, wherein the air conditioner is characterized.   5. The air conditioner according to claim 4, wherein the throttle portion is formed by a wind direction plate that varies a wind direction of air sent from the blower outlet.   The air conditioner according to any one of claims 1 to 5, further comprising a third heating operation mode in which the first heating operation mode is performed continuously to the second heating operation mode.

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