JP6873331B2 - Indoor unit of air conditioner - Google Patents

Description

The present invention relates to an indoor unit of an air conditioner that harmonizes the air-conditioned space.

Conventionally, an air conditioner adjusts the angle of the wind direction plate to determine the direction of the air flow, and adjusts the rotation speed of the fan to determine the speed of the air flow. In such an air conditioner, an air flow from the suction port to the air outlet is usually generated inside the indoor unit, so that the direction of the air flow in the indoor unit is constant.

By reversing the direction of the airflow by utilizing the property that the cold air descends near the set temperature in the cooling operation and in the dehumidifying operation, the cold air is prevented from directly hitting the user's body and cooled from the air above the room. An air conditioner has been proposed (see, for example, Patent Document 1). Further, there is known an air conditioner that prevents dust from adhering to an indoor heat exchanger during filter cleaning by reversing the direction of the air flow (see, for example, Patent Document 2).

Patent Documents 1 and 2 disclose the advantages obtained by allowing the direction of airflow to be reversed. However, the direction of the air flow cannot be reversed by simply rotating the cross flow fan in the reverse direction. On the other hand, a device capable of reversing the airflow direction has been proposed (see, for example, Patent Documents 3 and 4).

Patent Document 3 discloses a blower that switches the direction of airflow by providing two types of air passages in one cross-flow fan. Since it is necessary to provide the dedicated air passages for the forward rotation and the reverse rotation of the cross flow fan in this blower, each dedicated air passage becomes narrow.

Patent Document 4 discloses a circulation device having a cross-flow fan in which an outer rotor and an inner rotor smaller than the outer rotor are provided inside the outer rotor. The blades of the outer rotor and the blades of the inner rotor are in different directions, and the inner rotor is one size smaller than the outer rotor. The cross-flow fan has a double-cylindrical structure in which an outer rotor and an inner rotor are coaxially provided. In this cross flow fan, the direction of the air flow can be switched by rotating the outer rotor when the motor rotates in the forward direction and rotating the inner rotor when the motor rotates in the reverse direction.

Japanese Unexamined Patent Publication No. 2002-181344 JP-A-2017-489949 Japanese Unexamined Patent Publication No. 2016-168863 Japanese Unexamined Patent Publication No. 9-282546

The circulation device disclosed in Patent Document 4 has a common air passage for forward rotation and reverse rotation, but cannot obtain an appropriate air volume due to the structure of the cross flow fan. The details will be described below. Since the airflow of the cross-flow fan passes through the inside of the cylinder, when the outer rotor rotates in the forward direction, the inner rotor in the cylinder becomes an obstacle to the airflow, and it is considered that the airflow is obstructed and the air volume decreases. Further, since the inner rotor is surrounded by the blades of the outer rotor, it is considered that the air flow is obstructed during the reverse rotation and the air volume is reduced. Therefore, in order to obtain the required air volume, it is necessary to rotate the motor at a rotation speed higher than that of a normal cross-flow fan, resulting in high power consumption.

The present invention has been made to solve the above problems, and provides an indoor unit of an air conditioner that efficiently generates an air flow even if the direction of the air flow is reversed.

The indoor unit of the air conditioner according to the present invention includes a casing in which a suction port and an air outlet are formed, a load-side heat exchanger in which air sucked from the air-conditioned space exchanges heat with a refrigerant, and suction from the air-conditioned space. It has a cross-flow fan that supplies air to the load-side heat exchanger and a motor that drives the cross-flow fan, and the cross-flow fan is formed in a shaft connected to the motor and in the casing. A first impeller that sucks air from the air-conditioned space through the suction port when the shaft rotates in the forward direction, and is arranged in the air passage and the shaft rotates in the forward direction. The rotational force of the second impeller that sucks air from the air-conditioned space through the air outlet and the shaft that is provided on the first impeller and rotates in the forward direction when rotating in the opposite direction to the above. Is transmitted to the first impeller, and the first clutch that idles when the shaft rotates in the reverse direction and the rotational force of the shaft provided on the second impeller and that rotates in the reverse direction are applied to the second. It has a second clutch that transmits to the impeller and spins when the shaft rotates in the forward direction.

According to the present invention, in a single air passage, the turbulence of the air flow is suppressed, and the direction of the air flow can be reversed without impairing the air volume.

FIG. 5 is an external perspective view showing a configuration example of an indoor unit of the air conditioner according to the first embodiment of the present invention. It is an enlarged perspective view when the inside of the indoor unit shown in FIG. 1 is seen from the side. It is a block diagram of the indoor unit shown in FIG. 1 and the remote controller operated by a user. It is a functional block diagram which shows one configuration example of the control device shown in FIG. It is an external perspective view which shows one structural example of the impeller of Comparative Example 1. FIG. It is an enlarged view which shows the structure of the support disk shown in FIG. It is an external perspective view which shows one structural example of the impeller of Comparative Example 2. FIG. It is an enlarged view which shows the structure of the support disk shown in FIG. 7. It is an external perspective view which shows one configuration example of the impeller shown in FIG. It is an enlarged view which shows one configuration example of the forward rotation impeller and the reverse rotation impeller shown in FIG. It is an enlarged view which shows the structure of the support disk of the forward rotation impeller shown in FIG. It is an enlarged view which shows the structure of the support disk of the reverse rotation impeller shown in FIG. It is an enlarged view which shows the structure of the 1st clutch shown in FIG. It is an enlarged view which shows the structure of the 2nd clutch shown in FIG. It is an external perspective view for demonstrating the case where the impeller shown in FIG. 9 rotates in the forward direction. FIG. 5 is an external perspective view for explaining a case where the impeller shown in FIG. 9 rotates in the reverse direction. It is a flowchart which shows the operation procedure of the control device shown in FIG.

Embodiment 1.
The configuration of the indoor unit of the air conditioner according to the first embodiment will be described. FIG. 1 is an external perspective view showing a configuration example of an indoor unit of the air conditioner according to the first embodiment of the present invention. FIG. 2 is an enlarged perspective view of the inside of the indoor unit shown in FIG. 1 when viewed from the side surface. 1 and 2 schematically show an example of an indoor unit of an air conditioner, and the indoor unit of the first embodiment is not limited to the configuration shown in FIGS. 1 and 2. In the first embodiment, the case where the indoor unit of the air conditioner is mounted on a wall is described, but the indoor unit may be a ceiling-suspended type suspended from the ceiling.

As shown in FIG. 1, the indoor unit 1 has a casing 4 in which an air suction port 2 and an air outlet 3 are formed. In the configuration example shown in FIG. 1, the suction port 2 is provided on the upper side (Z-axis arrow direction) of the casing 4, and the air outlet 3 is provided on the lower side (opposite side in the Z-axis arrow direction) of the casing 4. As shown in FIG. 2, the casing 4 of the indoor unit 1 has a load side heat exchanger 6 in which the air sucked from the room, which is the space to be air-conditioned, exchanges heat with the refrigerant, and the air sucked in from the room. Is provided with a cross flow fan 7 for supplying the load side heat exchanger 6. The cross flow fan 7 has an impeller 8. Further, as shown in FIG. 1, the air outlet 3 is provided with a wind direction plate 5 for adjusting the wind direction of the air blown out by the cross flow fan 7.

As shown in FIG. 2, an air passage 9 from the suction port 2 to the air outlet 3 is formed in the casing 4. FIG. 2 shows a state in which the wind direction plate 5 blocks the air outlet 3, but the wind direction plate 5 opens at the start of operation of the air conditioner, and the air outlet 3 is opened. The load side heat exchanger 6 and the cross flow fan 7 are arranged in order along the air passage 9 from the suction port 2 to the air outlet 3. The broken line arrow indicated by the air passage 9 in FIG. 2 indicates the direction of the air flow generated when the impeller 8 rotates in the forward direction. When the impeller 8 is driven in a forward rotation during the operation of the air conditioner, an air flow is created from the suction port 2 to the air outlet 3 via the load side heat exchanger 6 and the impeller 8.

The air conditioner of the first embodiment has an outdoor unit to which the load side heat exchanger 6 shown in FIG. 1 is connected via a refrigerant pipe, but the outdoor unit is omitted from the figure. doing. Further, in the first embodiment, detailed description of the configuration of the outdoor unit will be omitted. Although not shown in the figure, the outdoor unit includes a compressor that compresses and discharges the refrigerant, a heat source side heat exchanger that exchanges heat with the outside air, and an expansion valve that decompresses and expands the refrigerant. The expansion valve (not shown in the figure) may be provided in the indoor unit 1.

FIG. 3 is a block diagram of the indoor unit shown in FIG. 1 and the remote controller operated by the user. The air conditioner of the first embodiment has a remote controller 70 for the user to operate the air conditioner. The remote controller 70 includes an operation unit 71 for the user to input an operation instruction and a set temperature to the air conditioner, a display unit 72, a transmission unit 73 for transmitting an instruction signal to the indoor unit 1, and a control unit. Has 74 and. The control unit 74 has a memory 75 for storing a program and a CPU (Central) that executes processing according to the program.
It has a Processing Unit) 76. The display unit 72 displays an operation mode such as a heating operation and a cooling operation, and a set temperature. The remote controller 70 may be provided with a temperature sensor (not shown). In this case, the display unit 72 may display the room temperature detected by the temperature sensor. The instruction signal is, for example, a signal indicating an operation mode instruction, a start-up instruction, a wind direction instruction, a set temperature, and the like.

The indoor unit 1 includes a receiving unit 61 that receives an instruction signal from the remote controller 70, a motor 32 that drives the impeller 8, and a control device 60 that controls the motor 32 and the wind direction plate 5 according to the instruction signal. The control device 60 has a memory 62 for storing a program and a CPU 63 for executing processing according to the program. The transmitting unit 73 and the receiving unit 61 transmit and receive signals by wireless communication. Wireless communication is, for example, infrared communication.

FIG. 4 is a functional block diagram showing a configuration example of the control device shown in FIG. When the CPU 63 shown in FIG. 3 executes the program, the wind direction control means 64, the motor control means 65, and the timer 66 shown in FIG. 4 are configured in the indoor unit 1. The wind direction control means 64 adjusts the direction of the wind direction plate 5 according to the instruction signal received from the transmission unit 73 by the reception unit 61. The timer 66 measures the time according to the instruction of the motor control means 65. The motor control means 65 controls the rotation direction, rotation speed, and the like of the motor 32 according to an instruction signal received from the transmission unit 73 by the reception unit 61. In the first embodiment, the case where the remote controller 70 and the control device 60 communicate wirelessly will be described, but the remote controller 70 and the control device 60 may communicate by wire.

Next, before explaining the configuration of the impeller 8 of the cross flow fan 7 in the first embodiment, the configurations of the impellers of Comparative Examples 1 and 2 will be described.

FIG. 5 is an external perspective view showing a configuration example of the impeller of Comparative Example 1. FIG. 6 is an enlarged view showing the configuration of the support disk shown in FIG. As shown in FIG. 5, the impeller 100 of Comparative Example 1 has a configuration in which a plurality of unit impellers 110 are arranged along the rotation shaft 300. The unit impeller 110 has a support disk 113 and a plurality of blade plates 115. As shown in FIG. 6, the plurality of blade plates 115 are attached along the outer circumference of the support disc 113 in a state where the surface of the blade plate 115 is tilted at a constant angle with respect to the tangent line of the outer peripheral circle.

FIG. 6 shows a case where guide walls 311 and 312 are provided around a plurality of blade plates 115 in order to explain the direction of the air flow generated by the rotation of the impeller 100. When the impeller 100 rotates forward about the rotation shaft 300 as shown by the solid line arrow in FIG. 5, the support disk 113 rotates in the direction of the solid line arrow shown in FIG. When the support disk 113 rotates, an air flow is generated from the upper side (Z-axis arrow direction) to the lower side (opposite direction of the Z-axis arrow) of the support disk 113 as shown by the broken line arrow in FIG.

FIG. 7 is an external perspective view showing a configuration example of the impeller of Comparative Example 2. FIG. 8 is an enlarged view showing the configuration of the support disk shown in FIG. 7. FIG. 8 also shows a case where the guide walls 311 and 312 are provided as in FIG. As shown in FIG. 7, the impeller 200 of Comparative Example 2 has a configuration in which a plurality of unit impellers 210 are arranged along the rotation shaft 300. The unit impeller 210 has a support disk 213 and a plurality of blade plates 215. As shown in FIG. 8, the plurality of blade plates 215 are attached along the outer circumference of the support disc 213 in a state in which the surface of the blade plate 215 is tilted at a constant angle with respect to the tangent line of the outer peripheral circle. Comparing FIGS. 8 and 6, the inclination direction of the blade plate 215 shown in FIG. 8 is opposite to the inclination direction of the blade plate 115 shown in FIG.

When the impeller 100 rotates about the rotation shaft 300 in the opposite direction to the forward rotation as shown by the solid line arrow in FIG. 7, the support disk 213 rotates in the direction of the solid line arrow shown in FIG. When the support disk 213 rotates, an air flow is generated from the lower side (opposite direction to the Z-axis arrow) to the upper side (Z-axis arrow direction) of the support disk 213 as shown by the broken line arrow in FIG.

In the configuration shown in FIG. 1, the direction of the circulating flow between the indoor unit and the indoor unit 1 is determined by the direction and position of the circulating vortex generated by the air flow of the cross flow fan 7. The formation of this circulation vortex is determined by the shape of the blades of the cross flow fan 7 and the shape around the cross flow fan 7. Even if the impeller 100 shown in FIG. 5 is rotated in the reverse direction, no circulating vortex is generated and no airflow itself is generated. Therefore, the impeller 200 whose blade plate is inclined in the opposite direction to the impeller 100 is rotated in the reverse direction. As a result, the direction of the circulating vortex generated in the indoor unit 1 can be changed, and an air flow in the direction opposite to the airflow generated by the impeller 100 can be generated. The impeller 100 shown in FIG. 5 functions as an impeller for forward rotation, and the impeller 200 shown in FIG. 7 functions as an impeller for reverse rotation.

Next, the configuration of the impeller 8 of the cross flow fan 7 of the first embodiment will be described. FIG. 9 is an external perspective view showing a configuration example of the impeller shown in FIG. The impeller 8 has a first impeller 10, a second impeller 20, and a shaft 30 connected to a motor 32. In FIG. 9, it is omitted that the shaft 30 is shown inside the impeller 8.

As shown in FIG. 9, the first impeller 10 has a plurality of forward rotating impellers 10a to 10d. The second impeller 20 has a plurality of reverse rotation impellers 20a to 20c. The forward rotation impellers 10a to 10d function as a forward rotation impeller described with reference to FIG. The reverse rotation impellers 20a to 20c function as the reverse rotation impeller described with reference to FIG. 7. In the plurality of forward rotation impellers 10a to 10d and the plurality of reverse rotation impellers 20a to 20c, the forward rotation impeller and the reverse rotation impeller are alternately arranged along the parallel direction (X-axis arrow direction) of the shaft 30. Has been done.

For each impeller of the forward rotation impellers 10a to 10d, the length in the direction parallel to the shaft 30 (in the direction of the X-axis arrow) is L1. For each of the impellers 20a to 20c of the reverse rotation impeller, the length in the direction parallel to the shaft 30 is L2. The total LB1 of the length L1 of each impeller of the forward rotating impellers 10a to 10d is represented by LB1 = 4 × L1. Further, the total LB2 of the length L2 of each impeller of the reverse rotation impellers 20a to 20c is represented by LB2 = 3 × L2. It is desirable that the relationship is LB1> LB2.

FIG. 10 is an enlarged view showing a configuration example of the forward rotation impeller and the reverse rotation impeller shown in FIG. As shown in FIGS. 9 and 10, each impeller of the forward rotating impellers 10a to 10d has a support disk 11, a first clutch 12, and a plurality of impellers 13. Each impeller of the reverse rotation impellers 20a to 20c has a support disk 21, a second clutch 22, and a plurality of impellers 23.

FIG. 11 is an enlarged view showing the configuration of the support disk of the forward rotating impeller shown in FIG. FIG. 11 shows a case where guide walls 35 and 36 are provided around a plurality of blade plates 13 in order to explain the direction of the air flow generated by the rotation of the forward rotating impeller 10a. When the support disk 11 rotates in the direction of the solid arrow shown in FIG. 11, as shown by the broken arrow in FIG. 11, the support disk 11 is from the upper side (Z-axis arrow direction) to the lower side (opposite direction to the Z-axis arrow). Air flow occurs in.

FIG. 12 is an enlarged view showing the configuration of the support disk of the reverse rotation impeller shown in FIG. FIG. 12 also shows a case where the guide walls 35 and 36 are provided in the same manner as in FIG. When the support disk 21 rotates in the direction of the solid arrow shown in FIG. 12, as shown by the broken arrow in FIG. 12, the support disk 21 is from the lower side (opposite to the Z-axis arrow) to the upper side (Z-axis arrow direction). Air flow occurs in.

In the indoor unit 1 of the air conditioner of the first embodiment, a motor 32 capable of changing the rotation direction is connected to a series of cross flow fans 7 including forward rotation impellers 10a to 10d and reverse rotation impellers 20a to 20c. By doing so, the direction of the air flow is reversed in the casing 4. If the cross-flow fan 7 has a blade shape, an air flow in a direction corresponding to the blade shape can be generated in the casing 4 regardless of which direction the fan 7 is rotated.

However, when the shaft 30 rotates in the forward direction, the forward rotation impellers 10a to 10d rotate in the forward direction to generate an air flow, but the reverse rotation impellers 20a to 20c are not involved in the generation of the air flow even if they rotate in the forward direction. Further, when the shaft 30 rotates in the reverse direction, the reverse rotation impellers 20a to 20c rotate in the reverse direction to generate an air flow, but the forward rotation impellers 10a to 10d are not involved in the generation of the air flow even if they rotate in the reverse direction. In this way, if the impeller, which is not involved in the generation of airflow, also rotates, the airflow in the casing may be disturbed and the airflow may be obstructed. Therefore, it is desirable not to operate the impeller that is not involved in the generation of airflow.

Therefore, in the cross flow fan 7 of the first embodiment, as shown in FIGS. 9 and 10, the first clutch 12 is provided on the first impeller 10, and the second clutch 22 is the second. It is provided on the impeller 20. The first clutch 12 is a one-way clutch that engages teeth when rotating forward to transmit the rotational force of the shaft 30 to the first impeller 10, and idles when rotating in the reverse direction. The second clutch 22 is a one-way clutch in which teeth mesh with each other when rotating in the reverse direction to transmit the rotational force of the shaft 30 to the second impeller 20, and when rotating in the forward direction, the clutch is idle. FIG. 13 is an enlarged view showing the configuration of the first clutch shown in FIG.

As shown in FIG. 13, the first clutch 12 has a disk shape, and has a cam plate 83a in which a plurality of gaps 82 are formed between the outer ring portion 90a and the inner ring 81, a plurality of rollers 84, and a plurality of rollers 84. With a spring 85 of. A plurality of blade plates 13 shown in FIG. 11 are connected to the outer shell portion 90a. A roller 84 and a spring 85 are provided in each of the plurality of gaps 82. One end of the spring 85 is connected to the cam plate 83a and the other end is connected to the roller 84. A shaft hole 86 to which the shaft 30 shown in FIG. 10 is connected is provided in the center of the cam plate 83a.

The operation of the first clutch 12 shown in FIG. 13 will be briefly described. When the shaft 30 shown in FIG. 10 rotates in the forward direction, the cam plate 83a rotates in the direction of the arrow shown in FIG. When the cam plate 83a rotates, the spring 85 contracts and an elastic force is generated. The elastic force of the spring 85 presses the roller 84 against the gap 82. The roller 84, which has nowhere to go, pushes the cam plate 83a and the inner ring 81. As a result, when each roller 84 of the plurality of rollers 84 pushes the outer shell portion 90a via the inner ring 81, a rotational force is generated in the first clutch 12, and the first clutch 12 rotates in the direction of the arrow shown in FIG. To do. Along with the rotation of the first clutch 12, the forward rotation impeller 10a shown in FIG. 10 rotates forward. In this way, when the shaft 30 rotates in the forward direction, the first clutch 12 transmits the rotational force of the shaft 30 to the forward rotation impeller 10a to rotate the forward rotation impeller 10a in the forward direction.

On the other hand, when the shaft 30 shown in FIG. 10 rotates in the reverse direction (rotates in the direction opposite to the arrow), the spring 85 stretches and no elastic force acts on the roller 84. As a result, only the cam plate 83a rotates together with the shaft 30, and the outer shell portion 90a of the first clutch 12 does not rotate. In this way, when the shaft 30 rotates in the reverse direction, the first clutch 12 does not transmit the rotational force of the shaft 30 to the forward rotation impeller 10a, so that the forward rotation impeller 10a is not rotated.

FIG. 14 is an enlarged view showing the configuration of the second clutch shown in FIG. As shown in FIG. 14, the second clutch 22 has a disk shape, and has a cam plate 83b in which a plurality of gaps 82 are formed between the outer ring portion 90b and the inner ring 81, a plurality of rollers 84, and a plurality of rollers 84. With a spring 85 of. A plurality of blade plates 23 shown in FIG. 12 are connected to the outer shell portion 90b. A roller 84 and a spring 85 are provided in each of the plurality of gaps 82. One end of the spring 85 is connected to the cam plate 83b and the other end is connected to the roller 84. A shaft hole 86 to which the shaft 30 shown in FIG. 10 is connected is provided in the center of the cam plate 83b.

The operation of the second clutch 22 shown in FIG. 14 is the same except that the first clutch 12 rotates in the direction opposite to the rotation direction described with reference to FIG. 13, so a detailed description thereof will be given. Omit. When the shaft 30 rotates in the reverse direction, the second clutch 22 transmits the rotational force of the shaft 30 to the reverse rotation impeller 20a to rotate the reverse rotation impeller 20a in the reverse direction. On the other hand, when the shaft 30 rotates in the forward direction, the second clutch 22 does not transmit the rotational force of the shaft 30 to the reverse rotation impeller 20a, so that the reverse rotation impeller 20a does not rotate.

As described with reference to FIGS. 13 and 14, the first clutch 12 and the second clutch 22 function as unidirectional clutches regardless of whether the shaft 30 rotates in the forward or reverse direction. Therefore, the impeller that is not involved in the generation of airflow does not rotate. Therefore, it is possible to suppress the disturbance of the airflow in the casing and efficiently generate the target airflow.

Next, the operation of the impeller 8 of the cross flow fan 7 shown in FIG. 7 will be described. FIG. 15 is an external perspective view for explaining a case where the impeller shown in FIG. 9 rotates in the forward direction. As shown in FIG. 15, when the shaft 30 rotates in the forward direction, the forward rotation impellers 10a to 10d rotate in the forward direction as shown by the solid line arrows, but the reverse rotation impellers 20a to 20c do not rotate. By idling the reverse rotating impellers 20a to 20c, the turbulence of the airflow is suppressed, and the airflow shown by the broken line arrow in FIG. 11 is efficiently generated.

FIG. 16 is an external perspective view for explaining a case where the impeller shown in FIG. 9 rotates in the reverse direction. As shown in FIG. 16, when the shaft 30 rotates in the reverse direction, the reverse rotation impellers 20a to 20c rotate in the reverse direction as shown by the solid arrows, but the forward rotation impellers 10a to 10d do not rotate. By idling the forward rotating impellers 10a to 10d, the turbulence of the airflow is suppressed, and the airflow shown by the broken line arrow in FIG. 12 is efficiently generated. Even if the direction of the air flow is reversed, it is possible to prevent the air volume from being impaired.

With reference to FIGS. 15 and 16, the plurality of forward rotation impellers 10a to 10d and the plurality of reverse rotation impellers 20a to 20c are aligned with the forward rotation impeller along the parallel direction (X-axis arrow direction) of the shaft 30. Reverse rotating impellers are arranged alternately. In this case, when the shaft 30 rotates in the forward direction, the cross flow fan 7 can suck in the air in the room more evenly from the suction port 2 and blow out the air more evenly into the room from the air outlet 3. Further, when the shaft 30 rotates in the reverse direction, the cross flow fan 7 can suck the air in the room more evenly from the air outlet 3 and blow the air into the room more evenly from the suction port 2.

Further, as described with reference to FIG. 9, when the relationship of LB1> LB2, the cross flow fan 7 exchanges heat with the refrigerant at the time of forward rotation and at the time of reverse rotation as compared with the case of reverse rotation. The air after heat exchange can be supplied to the room.

Next, in the first embodiment, the control in which the indoor unit 1 switches the direction of the air flow will be described. Here, the case where the air conditioner performs the heating operation will be described. Further, the memory 62 stores the set time tset for switching the rotation direction of the motor 32. The set time tset is, for example, 3 minutes. FIG. 17 is a flowchart showing an operation procedure of the control device shown in FIG.

The motor control means 65 determines whether or not to receive the operation start instruction signal from the receiving unit 61 (step S101). When the motor control means 65 receives the signal of the instruction to start the heating operation from the receiving unit 61, the motor control means 65 activates the motor 32 to rotate the cross flow fan 7 in the reverse direction (step S102). The motor control means 65 activates the timer 66 to measure the elapsed time t from the activation of the air conditioner. The motor control means 65 determines whether or not the elapsed time t has reached the set time tset (step S103). When the elapsed time t reaches the set time tset, the rotation direction of the cross flow fan 7 is switched from the reverse rotation to the forward rotation by switching the rotation direction of the motor 32 (step S104).

According to the procedure shown in FIG. 17, after the air conditioner is started, an air flow is generated from the outlet 3 to the suction port 2 via the load side heat exchanger 6 until the set time tset. The air around 2 is warmed. When the elapsed time t reaches the set time tset, the airflow is switched from the suction port 2 to the airflow outlet 3 via the load side heat exchanger 6, so that the air warmed near the suction port 2 is switched to the load side heat exchanger. At step 6, heat is absorbed from the refrigerant and the temperature rises further. As a result, the indoor unit 1 can not only suppress the blowing of cold air from the air outlet 3, but also supply warmer air to the room from the air outlet 3.

Although the case of the heating operation has been described with reference to FIG. 17, the same effect as that of the heating operation can be obtained in the case of the cooling operation. Specifically, the indoor unit 1 can suppress the hot air from being blown out from the air outlet 3, and can supply cooler air to the room from the air outlet 3.

Although the case where the motor control means 65 switches the rotation direction of the motor 32 when the condition for the elapsed time t to reach the set time tset is satisfied with reference to FIG. 17, the condition for switching the rotation direction of the motor 32 has elapsed. It is not limited to the case of time t. For example, the suction port 2 may be provided with a suction air temperature sensor (not shown in the figure). In this case, the motor control means 65 may switch the rotation direction of the motor 32 when the detection value of the suction air temperature sensor satisfies the condition that matches the determined temperature. For example, in the case of heating operation, after the temperature of the air near the suction port 2 rises to a predetermined temperature, the direction of the air flow is switched to suppress the blowing of cold air into the room at startup and to make the warm air into the room. Can be supplied to.

Further, although the case where the motor control means 65 controls to switch the rotation direction of the motor 32 is described with reference to FIG. 17, the user may operate the remote controller 70 to switch the rotation direction of the motor 32. .. When the rotation direction instruction signal indicating the rotation direction of the motor 32 is input via the operation unit 71, the control unit 74 of the remote controller 70 transmits the rotation direction instruction signal to the indoor unit 1 via the transmission unit 73. To do. When the receiving unit 61 receives the rotation direction instruction signal from the remote controller 70, the receiving unit 61 transmits the rotation direction instruction signal to the control device 60. When the motor control means 65 of the control device 60 receives the rotation direction instruction signal from the receiving unit 61, the motor control means 65 switches the rotation direction of the motor 32 according to the rotation direction instruction signal.

For example, when the air conditioner starts the heating operation, the user inputs an instruction to reverse the rotation direction of the motor 32 to the operation unit 71, and after a certain period of time, the rotation direction of the motor 32 is changed to the forward rotation. It is conceivable to input the instruction to be performed to the operation unit 71. The fixed time is, for example, 1 to 5 minutes. In this case, since the cross flow fan 7 switches from the reverse rotation to the forward rotation after the air near the suction port 2 has warmed up, warm air is supplied to the user.

In the first embodiment, the case where the first impeller 10 has a plurality of forward rotation impellers 10a to 10d and the second impeller 20 has a plurality of reverse rotation impellers 20a to 20c will be described. However, there may be one forward rotation impeller and one reverse rotation impeller. For example, the first impeller 10 has a configuration in which forward rotation impellers 10a to 10d are laminated along the shaft 30, and the second impeller 20 has reverse rotation impellers 20a to 20c laminated along the shaft 30. It may be a configured configuration.

Further, although the case where the ratio of the lengths of the first impeller 10 and the second impeller 20 in the shaft 30 direction is 4: 3, the ratio of the length ratios is limited to 4: 3. Absent. The ratio of the length ratios of the first impeller 10 and the second impeller 20 in the shaft 30 direction may be, for example, 10: 1. Further, although the case where the forward rotating impeller and the reverse rotating impeller are arranged alternately is shown, it does not have to be alternate.

The cross-flow fan 7 of the indoor unit 1 of the first embodiment has a first impeller 10 that sucks air from the suction port 2 during forward rotation and a second impeller 20 that sucks air from the air outlet 3 during reverse rotation. And two clutches that idle one of the above two impellers according to the direction of rotation. Of the two clutches, the first clutch 12 is provided on the first impeller 10 and transmits the rotational force of the shaft 30 that rotates forward to the first impeller 10, and the shaft 30 rotates in the reverse direction. Sometimes it slips. Of the two clutches, the other second clutch 22 is provided on the second impeller 20 and transmits the rotational force of the shaft 30 that rotates in the reverse direction to the second impeller 20, so that the shaft 30 rotates in the forward direction. Sometimes it slips.

According to the first embodiment, when the shaft 30 rotates in the forward direction, the first impeller 10 for forward rotation rotates, and the second impeller 20 for reverse rotation idles. On the other hand, when the shaft 30 rotates in the reverse direction, the second impeller 20 for reverse rotation rotates, and the first impeller 10 for forward rotation idles. Therefore, in a single air passage formed between one suction port 2 and one air outlet 3, the turbulence of the air flow can be suppressed and the direction of the air flow can be reversed without impairing the air volume. As a result, airflows in different directions can be efficiently generated.

Further, in the first embodiment, since there is no obstacle to the air flow inside and outside the impeller 8, it is possible to remove the factor that impairs the air flow, and it is only necessary to switch the rotation direction of the motor 32. , The direction of the airflow can be changed without impairing the air volume. Further, in the first embodiment, since the airflow direction can be reversed by a single airflow path, it is not necessary to provide a dedicated airflow path for each of the airflows having different directions.

In the first embodiment, the first impeller 10 has a plurality of forward rotation impellers 10a to 10d, the second impeller 20 has a plurality of reverse rotation impellers 20a to 20c, and the second impeller 20 has a plurality of forward rotation impellers 20a to 20c. Cars and counter-rotating impellers may be arranged alternately along the shaft 30. In this case, the cross-flow fan 7 sucks air evenly from the room and blows out the air after heat exchange more evenly into the room regardless of whether the impeller 8 rotates in the forward or reverse direction. it can.

In the first embodiment, the total length LB1 of the plurality of forward rotation impellers 10a to 10d in the direction parallel to the shaft 30 is the length in the direction parallel to the shaft 30 of the plurality of reverse rotation impellers 20a to 20c. It may be longer than the total LB2. In this case, the cross-flow fan 7 can exchange heat with the refrigerant in the forward rotation than in the reverse rotation, and can supply the air after the heat exchange into the room.

The indoor unit 1 of the first embodiment has a remote controller 70 that switches the rotation direction of the motor 32 according to the rotation direction instruction signal when the rotation direction instruction signal indicating the rotation direction of the motor 32 is input. May be good. For example, when the user feels that a cold wind is applied at the start of the heating operation, the user operates the remote controller 70 to rotate the cross flow fan 7 in the reverse direction. After that, after a certain period of time has elapsed, the user operates the remote controller 70 to rotate the cross flow fan 7 in the forward direction. The fixed time is, for example, 1 to 5 minutes. Since the cross flow fan 7 switches from reverse rotation to forward rotation after the air near the suction port 2 has warmed up, warm air is supplied to the user. The switching of the rotation direction of the motor 32 by the user is not limited to the heating operation, but may be the case of the cooling operation.

In the indoor unit 1 of the first embodiment, when the motor control means 65 receives an instruction to start the air conditioner, the motor 32 is rotated in the reverse direction, and then the rotation direction of the motor 32 is changed from the reverse rotation to the forward rotation. You may switch. For example, when the air conditioner starts the heating operation, the cross flow fan 7 automatically switches from the reverse rotation to the forward rotation after the air near the suction port 2 has warmed up. Even if the user does not operate the remote controller 70 to switch the rotation direction of the motor 32, the indoor unit 1 can prevent the cold air from being supplied to the room when the air conditioner is started. The switching of the rotation direction of the motor 32 by the motor control means 65 is not limited to the heating operation, but may be the case of the cooling operation.

1 Indoor unit, 2 Suction port, 3 Air outlet, 4 Casing, 5 Wind direction plate, 6 Load side heat exchanger, 7 Cross flow fan, 8 impeller, 9 Air passage, 10 1st impeller, 10a-10d Positive Rotary impeller, 11 support disc, 12 first clutch, 13 vane plate, 20 second impeller, 20a-20c reverse rotary impeller, 21 support disc, 22 second clutch, 23 impeller, 30 Shaft, 32 motor, 35, 36 guide wall, 60 controller, 61 receiver, 62 memory, 63 CPU, 64 wind direction control means, 65 motor control means, 66 timer, 70 remote controller, 71 operation unit, 72 display unit, 73 Transmitter, 74 Control, 75 Memory, 76 CPU, 81 Inner ring, 82 Gap, 83a, 83b Cam plate, 84 Roller, 85 Spring, 86 Shaft hole, 90a, 90b Outer part, 100 impeller, 110 Unit impeller , 113 support disc, 115 vane, 200 impeller, 210 unit impeller, 213 support disc, 215 vane, 300 rotating shaft, 311 and 312 guide wall.

Claims (7)

With the casing in which the suction port and the air outlet are formed,
A load-side heat exchanger in which the air sucked from the air-conditioned space exchanges heat with the refrigerant,
A cross-flow fan that supplies air sucked from the air-conditioned space to the load-side heat exchanger,
It has a motor that drives the cross-flow fan, and
The cross flow fan
The shaft connected to the motor and
A first impeller that is arranged in an air passage formed in the casing and sucks air from the air-conditioned space through the suction port when the shaft rotates in the forward direction.
A second impeller that is arranged in the air passage and that sucks air from the air-conditioned space through the air outlet when the shaft rotates in the reverse direction opposite to the forward rotation.
A first clutch provided on the first impeller, transmitting the rotational force of the shaft that rotates in the forward direction to the first impeller, and idling when the shaft rotates in the reverse direction.
A second clutch provided on the second impeller, transmitting the rotational force of the shaft that rotates in the reverse direction to the second impeller, and idling when the shaft rotates in the forward direction.
Indoor unit of air conditioner with. The first impeller has a plurality of forward rotation impellers and has a plurality of forward rotation impellers.
The second impeller has a plurality of reverse rotation impellers and has a plurality of reverse rotation impellers.
The indoor unit of the air conditioner according to claim 1, wherein the forward rotating impeller and the reverse rotating impeller are arranged alternately along the shaft. The second aspect of the present invention, wherein the total length of the plurality of forward rotation impellers in the direction parallel to the shaft is longer than the total length of the plurality of reverse rotation impellers in the direction parallel to the shaft. Indoor unit of air conditioner. The method according to any one of claims 1 to 3, further comprising a remote controller that switches the rotation direction of the motor according to the rotation direction instruction signal when the rotation direction instruction signal indicating the rotation direction of the motor is input. Indoor unit of air conditioner. Further having a motor control means for controlling the motor,
The motor control means
When an instruction to start the air conditioner is input, the motor is rotated in the reverse direction, and then the rotation direction of the motor is switched from the reverse rotation to the forward rotation according to a determined condition. The indoor unit of the air conditioner according to any one of 3. The indoor unit of an air conditioner according to any one of claims 1 to 5, wherein the indoor unit is a wall-mounted type that is mounted on a wall. The indoor unit of the air conditioner according to any one of claims 1 to 5, wherein the indoor unit is a ceiling-suspended type that is suspended from the ceiling.

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