WO2020012525A1

WO2020012525A1 - Indoor unit for air conditioners

Info

Publication number: WO2020012525A1
Application number: PCT/JP2018/025851
Authority: WO
Inventors: 治翔佐野
Original assignee: 三菱電機株式会社
Priority date: 2018-07-09
Filing date: 2018-07-09
Publication date: 2020-01-16
Also published as: JPWO2020012525A1; JP6873331B2

Abstract

This indoor unit for air conditioners has: a casing (4) in which an intake port (2) and a blow-out port (3) are formed; a load-side heat exchanger (6) in which air suctioned from an air-conditioning target space exchanges heat with a refrigerant; a cross-flow fan (7) that supplies the load-side heat exchanger with the air suctioned from the air-conditioning target space; and a motor (32). The cross-flow fan has: a shaft connected to the motor; a first impeller (10) that suctions air from the air-conditioning target space through the intake port when the shaft rotates in the forward direction; a second impeller (20) that suctions air from the air-conditioning target space through the blow-out port when the shaft rotates in the reverse direction; a first clutch (12) that transmits the torque of the forward-rotating shaft to the first impeller and idly rotates when the shaft rotates in the reverse direction; and a second clutch (22) that transmits the torque of the reverse-rotating shaft to the second impeller and idly rotates when the shaft rotates in the forward direction.

Description

Air conditioner indoor unit

The present invention relates to an indoor unit of an air conditioner that air-conditions a space to be air-conditioned.

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

By using the property of the cool air to descend in the vicinity of the set temperature in the cooling operation and in the dehumidifying operation, the direction of the air flow is reversed to prevent the cool air from directly hitting the user's body and cool from the air above the room. An air conditioner has been proposed (for example, see Patent Document 1). There is also known an air conditioner that reverses the direction of airflow to prevent dust from adhering to an indoor heat exchanger during filter cleaning (for example, see Patent Document 2).

Patent Documents

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

Patent Document 3 discloses an air blowing device that switches the direction of airflow by providing two types of air paths in one cross flow fan. In this blower, since it is necessary to provide a dedicated air path for each of the normal rotation and the reverse rotation of the cross flow fan, each dedicated air path becomes narrow.

Patent Document 4 discloses a circulating 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 directions of the blades of the outer rotor and the blades of the inner rotor are different, and the inner rotor is slightly smaller than the outer rotor. The cross flow fan has a double cylinder configuration in which an outer rotor and an inner rotor are provided coaxially. In this crossflow fan, the direction of the airflow can be switched by rotating the outer rotor when the motor rotates forward and rotating the inner rotor when the motor rotates reversely.

JP-A-2002-181344 JP-A-2017-48949 JP 2016-168863 A JP-A-9-282546

循環 The circulation device disclosed in Patent Document 4 has a common wind path 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, it is conceivable that when the outer rotor rotates forward, the inner rotor in the cylinder becomes an obstacle to the airflow, and the airflow is obstructed and the airflow decreases. Also, since the inner rotor is surrounded by the blades of the outer rotor, it is considered that the airflow is hindered at the time of reverse rotation, and the air flow is reduced. Therefore, in order to obtain a required air volume, it is necessary to rotate the motor at a higher rotation speed than that of a normal crossflow fan, and the power consumption increases.

The present invention has been made to solve the above-described problem, and an object of the present invention is to provide an indoor unit of an air conditioner that efficiently generates an airflow even when the direction of the airflow is reversed.

An indoor unit of an air conditioner according to the present invention includes a casing having an inlet and an outlet formed therein, a load-side heat exchanger that exchanges air sucked from a space to be air-conditioned with a refrigerant, and sucks air from the space to be air-conditioned. A cross flow fan that supplies air to the load-side heat exchanger; and a motor that drives the cross flow fan, wherein 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 space to be air-conditioned through the suction port when the shaft is rotated forward and the shaft is arranged in the wind path and the shaft is rotated forward. When the reverse rotation is performed in the opposite direction, a second impeller that sucks air from the air-conditioned space through the air outlet and the first impeller are provided and rotate forward. A first clutch that transmits the rotational force of the shaft to the first impeller, and idles when the shaft rotates in the reverse direction; and a rotation of the shaft that is provided in the second impeller and rotates in the reverse direction. A second clutch that transmits force to the second impeller and idles when the shaft rotates forward.

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

FIG. 2 is an external perspective view illustrating a configuration example of an indoor unit of the air conditioner according to Embodiment 1 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 a side. FIG. 2 is a block diagram of the indoor unit shown in FIG. 1 and a remote controller operated by a user. FIG. 4 is a functional block diagram illustrating a configuration example of a control device illustrated in FIG. 3. FIG. 6 is an external perspective view illustrating a configuration example of an impeller of Comparative Example 1. It is an enlarged view which shows the structure of the support disk shown in FIG. FIG. 9 is an external perspective view illustrating a configuration example of an impeller of Comparative Example 2. It is an enlarged view which shows the structure of the support disk shown in FIG. FIG. 3 is an external perspective view illustrating a configuration example of an impeller illustrated in FIG. 2. FIG. 10 is an enlarged view illustrating a configuration example of a forward rotation impeller and a reverse rotation impeller illustrated in FIG. 9. 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. FIG. 11 is an enlarged view illustrating a configuration of a first clutch illustrated in FIG. 10. FIG. 11 is an enlarged view illustrating a configuration of a second clutch illustrated in FIG. 10. FIG. 10 is an external perspective view illustrating a case where the impeller shown in FIG. 9 rotates forward. FIG. 10 is an external perspective view for explaining a case where the impeller shown in FIG. 9 rotates in the reverse direction. 5 is a flowchart showing an operation procedure of the control device shown in FIG.

Embodiment 1 FIG.
The configuration of the indoor unit of the air conditioner according to Embodiment 1 will be described. FIG. 1 is an external perspective view illustrating a configuration example of an indoor unit of an air conditioner according to Embodiment 1 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. 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. In the first embodiment, the case where the indoor unit of the air conditioner is a wall-mounted type that is attached to a wall will be described, but the indoor unit may be a ceiling-hanging type that is hung from a ceiling.

室内 As shown in FIG. 1, the indoor unit 1 has a casing 4 in which an air inlet 2 and an air outlet 3 are formed. In the configuration example shown in FIG. 1, the suction port 2 is provided above the casing 4 (in the direction of the Z-axis), and the outlet 3 is provided below the casing 4 (in the direction opposite to the direction of the Z-axis). As shown in FIG. 2, a casing 4 of the indoor unit 1 includes a load-side heat exchanger 6 for exchanging heat between air and refrigerant sucked from the room to be air-conditioned, and air sucked from the room. And a cross-flow fan 7 for supplying the heat exchanger 6 to 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 by the cross flow fan 7.

風 As shown in FIG. 2, an air passage 9 is formed in the casing 4 from the inlet 2 to the outlet 3. FIG. 2 shows a state in which the wind direction plate 5 closes the air outlet 3, but when the air conditioner starts operating, the wind direction plate 5 is opened and the air outlet 3 is opened. A load-side heat exchanger 6 and a cross-flow fan 7 are arranged in order along an air path 9 from the suction port 2 to the air outlet 3. A dashed arrow indicated by the air path 9 in FIG. 2 indicates a direction of an airflow generated when the impeller 8 rotates forward. During operation of the air conditioner, when the impeller 8 is driven in a forward rotation, an air flow is created from the suction port 2 to the outlet 3 via the load-side heat exchanger 6 and the impeller 8.

Note that 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 does not show the outdoor unit in the drawing. are doing. In Embodiment 1, a detailed description of the configuration of the outdoor unit is omitted. Although not shown, the outdoor unit has a compressor that compresses and discharges the refrigerant, a heat source-side heat exchanger that exchanges heat with the outside air of the refrigerant, and an expansion valve that decompresses and expands the refrigerant. An expansion valve not shown may be provided in the indoor unit 1.

FIG. 3 is a block diagram of the indoor unit shown in FIG. 1 and a remote controller operated by a user. The air conditioner of the first embodiment has a remote controller 70 for a user to operate the air conditioner. The remote controller 70 includes an operation unit 71 for a user to input an operation instruction and a set temperature to the air conditioner, a display unit 72, a transmission unit 73 that transmits an instruction signal to the indoor unit 1, and a control unit. 74. The control unit 74 includes a memory 75 that stores a program, and a CPU (Central Processing Unit) 76 that executes processing according to the program. The display unit 72 displays operation modes 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 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 includes a memory 62 that stores a program, and a CPU 63 that executes processing according to the program. The transmitting unit 73 and the receiving unit 61 transmit and receive signals by wireless communication. The wireless communication is, for example, infrared communication.

FIG. 4 is a functional block diagram showing one 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. The wind direction control unit 64 adjusts the direction of the wind direction plate 5 according to the instruction signal received by the receiving unit 61 from the transmitting unit 73. The timer 66 measures time according to an instruction from the motor control unit 65. The motor control unit 65 controls the rotation direction and the number of rotations of the motor 32 according to the instruction signal received by the receiving unit 61 from the transmitting unit 73. In the first embodiment, a case will be described where the remote controller 70 and the control device 60 communicate wirelessly, but communication may be performed by wire.

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

FIG. 5 is an external perspective view illustrating an example of a configuration 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 axis 300. The unit impeller 110 has a support disk 113 and a plurality of blades 115. As shown in FIG. 6, the plurality of blades 115 are attached along the outer periphery of the support disk 113 such that the surface of the blade 115 is inclined at a fixed angle with respect to the tangent of the outer circumference circle.

FIG. 6 shows a case where the

guide walls

311 and 312 are provided around the plurality of blades 115 in order to explain the direction of the airflow generated when the impeller 100 rotates. When the impeller 100 rotates forward about the rotation axis 300 as shown by the solid arrow in FIG. 5, the support disk 113 rotates in the direction of the solid arrow shown in FIG. When the support disk 113 rotates, an air flow is generated from the upper side (in the direction of the Z-axis arrow) to the lower side (in the direction opposite to 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 an example of the configuration of the impeller of Comparative Example 2. FIG. 8 is an enlarged view showing the configuration of the support disk shown in FIG. FIG. 8 also shows a case where

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 axis 300. The unit impeller 210 has a support disk 213 and a plurality of blades 215. As shown in FIG. 8, the plurality of blades 215 are attached along the outer circumference of the support disk 213 in a state where the surface of the blade 215 is inclined at a fixed angle with respect to the tangent of the outer circumference circle. When FIG. 8 and FIG. 6 are compared, the inclination direction of the slat 215 shown in FIG. 8 is opposite to the inclination direction of the slat 115 shown in FIG.

When the impeller 100 rotates in the reverse direction opposite to the normal rotation about the rotation axis 300 as shown by the solid arrow in FIG. 7, the support disk 213 rotates in the direction of the solid arrow shown in FIG. When the support disk 213 rotates, air flows from below the support disk 213 (in the direction opposite to the Z-axis arrow) to above (in the Z-axis arrow direction), as indicated by the dashed arrow in FIG.

In the configuration shown in FIG. 1, the direction of the circulation flow between the room and the indoor unit 1 is determined by the direction and position of the circulation vortex generated by the airflow of the cross flow fan 7. The formation of this circulation vortex is determined by the blade shape 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 circulation vortex is generated and no airflow itself is generated. For this reason, the impeller 200 in which the inclination direction of the impeller is opposite to that of the impeller 100 is reversely rotated. Thereby, the direction of the circulation vortex generated in the indoor unit 1 can be changed, and an airflow in a direction opposite to the airflow generated by the impeller 100 can be generated. The impeller 100 shown in FIG. 5 functions as a forward rotation impeller, and the impeller 200 shown in FIG. 7 functions as a reverse rotation impeller.

Next, the configuration of the impeller 8 of the cross flow fan 7 according to the first embodiment will be described. FIG. 9 is an external perspective view illustrating an example of a configuration of the impeller illustrated in FIG. 2. The impeller 8 has a first impeller 10, a second impeller 20, and a shaft 30 connected to a motor 32. In FIG. 9, the illustration of the shaft 30 inside the impeller 8 is omitted.

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

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

FIG. 10 is an enlarged view showing an example of the configuration 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 rotation impellers 10a to 10d has a support disk 11, a first clutch 12, and a plurality of impellers 13. Each impeller of the counter-rotating 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 a configuration of a support disk of the forward rotation impeller shown in FIG. FIG. 11 shows a case where the

guide walls

35 and 36 are provided around the plurality of blade plates 13 in order to explain the direction of the airflow generated by the rotation of the forward rotation 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 moved from the upper side (the Z-axis arrow direction) to the lower side (the direction opposite to the Z-axis arrow). An air flow is generated.

FIG. 12 is an enlarged view showing the configuration of the support disk of the counter-rotating impeller shown in FIG. FIG. 12 also shows a case where

guide walls

35 and 36 are provided as in FIG. When the support disk 21 rotates in the direction of the solid arrow shown in FIG. 12, as shown by the dashed arrow in FIG. 12, the support disk 21 moves from the lower side (the direction opposite to the Z-axis arrow) to the upper side (the Z-axis arrow direction). An air flow is generated.

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

However, when the shaft 30 rotates forward, the forward rotation impellers 10a to 10d rotate forward to generate airflow, but the reverse rotation impellers 20a to 20c do not affect the generation of airflow even if they rotate forward. When the shaft 30 rotates in the reverse direction, the reverse rotation impellers 20a to 20c rotate in the reverse direction to generate airflow. However, even when the normal rotation impellers 10a to 10d rotate in the reverse direction, it does not affect the airflow generation. As described above, when the impeller that is not involved in the generation of the 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 which is not involved in the generation of airflow.

Therefore, in the cross flow fan 7 according to 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 provided on the second impeller 10. It is provided on the impeller 20. The first clutch 12 is a one-way clutch that meshes with the teeth to transmit the rotational force of the shaft 30 to the first impeller 10 when rotating forward, and idles when rotating backward. The second clutch 22 is a one-way clutch that engages with the teeth to transmit the rotational force of the shaft 30 to the second impeller 20 when rotating in the reverse direction, and idle when rotating in the forward direction. 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, a cam plate 83a in which a plurality of gaps 82 are formed between the first clutch 12 and the inner ring 81 of the outer shell 90a, a plurality of rollers 84, And a spring 85. The plurality of blades 13 shown in FIG. 11 are connected to the outer shell 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 forward, the cam plate 83a rotates in the arrow direction shown in FIG. When the cam plate 83a rotates, the spring 85 contracts, generating an elastic force. The elastic force of the spring 85 presses the roller 84 against the gap 82. The roller 84 having no place 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 presses the outer shell 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. I do. With the rotation of the first clutch 12, the forward rotation impeller 10a shown in FIG. In this manner, when the shaft 30 rotates forward, the first clutch 12 transmits the rotational force of the shaft 30 to the forward rotating impeller 10a, thereby rotating the forward rotating impeller 10a forward.

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 expands, 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 shell 90a of the first clutch 12 does not rotate. In this manner, 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 rotating impeller 10a, and thus does not rotate the forward rotating impeller 10a.

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, a cam plate 83b having a plurality of gaps 82 formed between the inner clutch 81 and the outer ring 90b, a plurality of rollers 84, and a plurality of rollers 84. And a spring 85. The plurality of blades 23 shown in FIG. 12 are connected to the outer shell 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 at 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 of the first clutch 12 described with reference to FIG. Omitted. 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, thereby causing the reverse rotation impeller 20a to rotate in the reverse direction. On the other hand, when the shaft 30 rotates forward, the second clutch 22 does not transmit the rotational force of the shaft 30 to the reverse rotation impeller 20a, and thus does not rotate the reverse rotation impeller 20a.

As described with reference to FIGS. 13 and 14, the first clutch 12 and the second clutch 22 function as one-way clutches regardless of whether the shaft 30 rotates in the forward rotation or the reverse rotation. Therefore, the impeller does not rotate regardless of the airflow. Therefore, disturbance of the airflow in the casing can be suppressed, and the target airflow can be efficiently generated.

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 forward. As shown in FIG. 15, when the shaft 30 rotates forward, the forward rotating impellers 10a to 10d rotate forward as indicated by solid arrows, but the reverse rotating impellers 20a to 20c do not rotate. The idle rotation of the counter-rotating impellers 20a to 20c suppresses the turbulence of the airflow, and efficiently generates the airflow indicated by the dashed arrow in FIG.

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 indicated by solid arrows, but the normal rotation impellers 10a to 10d do not rotate. The idle rotation of the forward rotation impellers 10a to 10d suppresses the turbulence of the airflow, and efficiently generates the airflow indicated by the dashed arrow in FIG. Even if the direction of the airflow is reversed, it is possible to suppress the loss of the air volume.

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

Further, as described with reference to FIG. 9, when the relationship LB1> LB2 is satisfied, the cross flow fan 7 causes more air to exchange heat with the refrigerant at the time of forward rotation than at the time of reverse rotation, The air after the 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 airflow will be described. Here, the case where the air conditioner performs the heating operation will be described. The memory 62 stores a 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.

(4) The motor control means 65 determines whether or not a signal for instructing operation to be started is received from the receiving unit 61 (step S101). When the motor control unit 65 receives the signal for starting the heating operation from the receiving unit 61, the motor control unit 65 starts the motor 32 to rotate the cross flow fan 7 in the reverse direction (step S102). The motor control means 65 starts the timer 66 and measures the elapsed time t from the start of the air conditioner. The motor control unit 65 determines whether 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 reverse rotation to 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 airflow flowing from the outlet 3 to the inlet 2 via the load side heat exchanger 6 is generated until the set time tset, so that the inlet The air near 2 is warmed. When the elapsed time t reaches the set time tset, the air flow is switched from the suction port 2 to the air outlet 3 via the load-side heat exchanger 6, so that the air warmed near the suction port 2 loses the load-side heat exchanger. In step 6, heat is absorbed from the refrigerant, and the temperature further rises. As a result, the indoor unit 1 can not only suppress the blowing of cold air from the outlet 3 but also supply warmer air from the outlet 3 to the room.

暖房 The case of the heating operation has been described with reference to FIG. 17, but the same effect as in the case of the heating operation can be obtained also in the case of the cooling operation. Specifically, the indoor unit 1 can suppress blowing out hot air from the outlet 3 and supply more cooled air from the outlet 3 to the room.

With reference to FIG. 17, a case has been described where the motor control unit 65 switches the rotation direction of the motor 32 when the condition that the elapsed time t reaches the set time tset is satisfied. It is not limited to the time t. For example, a suction air temperature sensor (not shown) may be provided in the suction port 2. In this case, the motor control means 65 may switch the rotation direction of the motor 32 if the condition that the detection value of the suction air temperature sensor matches the determined temperature is satisfied. For example, in the case of the heating operation, after the temperature of the air in the vicinity of the suction port 2 rises to a predetermined temperature, by switching the direction of the airflow, it is possible to suppress blowing out cold air into the room at the time of startup, and Can be supplied to

Also, with reference to FIG. 17, a case has been described in which the motor control unit 65 performs control for switching the rotation direction of the motor 32, but the user may operate the remote controller 70 to switch the rotation direction of the motor 32. . 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 when the rotation direction instruction signal for instructing the rotation direction of the motor 32 is input via the operation unit 71. I do. When receiving the rotation direction instruction signal from the remote controller 70, the reception unit 61 transmits the rotation direction instruction signal to the control device 60. When receiving the rotation direction instruction signal from the receiving unit 61, the motor control means 65 of the control device 60 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 of the air conditioner, 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, changes the rotation direction of the motor 32 to the normal rotation. It is conceivable to input an instruction to the operation unit 71. The certain time is, for example, 1 to 5 minutes. In this case, since the cross flow fan 7 switches from the reverse rotation to the normal rotation after the air in the vicinity of the suction port 2 is warmed, warm air is supplied to the user.

In the first embodiment, 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. However, one forward rotation impeller and one reverse rotation impeller may be provided. For example, the first impeller 10 has a configuration in which forward rotating impellers 10a to 10d are stacked along a shaft 30, and the second impeller 20 has a configuration in which reverse rotating impellers 20a to 20c are stacked along a shaft 30. A configuration may be adopted.

Also, the case where the ratio of the ratio of the length of the first impeller 10 and the second impeller 20 in the direction of the shaft 30 is 4 to 3 has been described, but the ratio of the ratio of the length is not limited to 4 to 3. Absent. The ratio of the ratio of the length of the first impeller 10 and the second impeller 20 in the shaft 30 direction may be, for example, 10: 1. Moreover, although the case where the forward rotation impeller and the reverse rotation impeller are arranged alternately is shown, the arrangement does not have to be alternating.

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

According to the first embodiment, at the time of forward rotation of the shaft 30, 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 normal rotation idles. Therefore, in a single air path formed between one suction port 2 and one air outlet 3, 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 having different directions can be efficiently generated.

Further, in the first embodiment, since no obstacle to the airflow is provided inside and outside the impeller 8, it is possible to remove a factor that impairs the airflow, and only by switching the rotation direction of the motor 32. In addition, the direction of the air flow can be changed without impairing the air volume. Furthermore, 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 airflow having a different direction.

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 wheels and the counter-rotating impeller may be arranged alternately along the shaft 30. In this case, regardless of whether the impeller 8 rotates in the normal rotation direction or the reverse rotation direction, the cross flow fan 7 can suck air evenly from the room and blow air after heat exchange into the room more evenly. 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 equal to the length of the plurality of reverse rotation impellers 20a to 20c in the direction parallel to the shaft 30. It may be longer than the total LB2. In this case, the cross flow fan 7 allows more air to exchange heat with the refrigerant at the time of forward rotation than at the time of reverse rotation, and can supply the air after the heat exchange to the room.

The indoor unit 1 according to the first embodiment includes a remote controller 70 that switches the rotation direction of the motor 32 according to the rotation direction instruction signal when a rotation direction instruction signal that indicates the rotation direction of the motor 32 is input. Is also good. For example, if the user feels that a cold wind is blowing 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. Thereafter, after a certain time has elapsed, the user operates the remote controller 70 to rotate the cross flow fan 7 forward. The certain time is, for example, 1 to 5 minutes. After the air in the vicinity of the suction port 2 is warmed, the cross flow fan 7 switches from the reverse rotation to the normal rotation, so that warm air is supplied to the user. Switching of the rotation direction of the motor 32 by the user is not limited to the heating operation, and may be a cooling operation.

When the motor control unit 65 receives an instruction to start the air conditioner, the indoor unit 1 according to the first embodiment rotates the motor 32 in the reverse direction, and then changes the rotation direction of the motor 32 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 reverse rotation to normal rotation after the air near the suction port 2 has warmed. 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 a cold wind from being supplied to the room when the air conditioner is started. Switching of the rotation direction of the motor 32 by the motor control means 65 is not limited to the heating operation, and may be a cooling operation.

1 indoor unit, 2 inlet, 3 outlet, 4 casing, 5 wind direction board, 6 load side heat exchanger, 7 cross flow fan, 8 impeller, 9 air path, 10 first impeller, 10a to 10d positive Rotating impeller, 11 ° supporting disk, 12 ° first clutch, 13 ° impeller, 20 ° second impeller, 20a to 20c reverse rotating impeller, 21 ° supporting disk, 22 ° second clutch, 23 ° impeller, 30 Shaft, 32 motor, 35, 36 guide wall, 60 control device, 61 receiving unit, 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 transmission unit, 74 control unit, 75 memory, 76 CPU, 81 inner ring, 82 clearance, 83a, 83b cam , 84 roller, 85 spring, 86 shaft hole, 90a, 90b outer shell, 100 impeller, 110 unit impeller, 113 support disc, 115 impeller, 200 impeller, 210 unit impeller, 213 support disc, 215 Blades, 300 ° rotating shaft, 311, 312 ° guide wall.

Claims

A casing in which an inlet and an outlet are formed,
A load-side heat exchanger in which 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,
And a motor for driving the cross flow fan,
The cross flow fan,
A shaft connected to the motor;
A first impeller that is disposed in an air passage formed in the casing and that sucks air from the air-conditioned space through the suction port when the shaft rotates forward;
A second impeller that is disposed in the air passage, and that sucks air from the air-conditioned space through the air outlet when the shaft performs reverse rotation opposite to the normal rotation;
A first clutch that is provided on the first impeller and transmits a rotational force of the shaft that rotates forward to the first impeller, and that idles when the shaft rotates reversely;
A second clutch that is provided on the second impeller and transmits the torque of the shaft that rotates in the reverse direction to the second impeller, and that idles when the shaft rotates in the forward direction;
An indoor unit of an air conditioner having a.
The first impeller has a plurality of forward rotation impellers,
The second impeller has a plurality of counter-rotating impellers,
The indoor unit of an air conditioner according to claim 1, wherein the forward rotation impeller and the reverse rotation impeller are alternately arranged along the shaft.
3. The sum of the lengths of the plurality of forward rotation impellers in a direction parallel to the shaft is longer than the sum of the lengths of the plurality of counter rotation impellers in a direction parallel to the shaft. 4. Indoor unit of air conditioner.
The remote controller according to any one of claims 1 to 3, further comprising: a remote controller that switches a rotation direction of the motor according to the rotation direction instruction signal when a rotation direction instruction signal that indicates a rotation direction of the motor is input. Air conditioner indoor unit.
Further comprising motor control means for controlling the motor,
The motor control means,
The rotation direction of the motor is switched from the reverse rotation to the normal rotation according to a predetermined condition after the motor is rotated in the reverse direction when an instruction to start the air conditioner is input. 4. 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 mounted on a wall.
The indoor unit of an air conditioner according to any one of claims 1 to 5, wherein the indoor unit is of a ceiling-suspended type suspended from a ceiling.