JP6083195B2 - Air conditioning indoor unit - Google Patents

Description

  The present invention relates to an air conditioning indoor unit.

  Patent Document 1 (Japanese Patent Application Laid-Open No. 2001-116346) has an upper suction port on the front and upper surfaces of the main body, a lower suction port on the bottom surface of the main body, and an air outlet on the lower front surface of the main body. An air conditioning indoor unit is disclosed. A flap is rotatably attached to the upper suction port, an opening / closing plate is attached to the lower suction port, and a flap is rotatably attached to the air outlet. When the air conditioning indoor unit is in operation, the flap of the upper suction port and the opening / closing plate of the lower suction port are opened, and air is taken in from the upper suction port and the lower suction port. The taken-in air is heat-exchanged by a heat exchanger, and then blown out from a blow-out opening in which a flap is opened via a blow-out flow path.

  The open / close plate of the lower suction port of Patent Document 1 is opened when the air conditioning indoor unit is in operation, but when the amount of air blown out from the air outlet decreases, the air blown out from the air outlet is directly sucked into the lower air inlet. A phenomenon (so-called short circuit) can occur. Patent Document 1 described above does not disclose a configuration for avoiding such a problem.

  Then, the objective of this invention is providing the air-conditioning indoor unit which can suppress a short circuit.

  An air conditioning indoor unit according to a first aspect of the present invention includes a main body casing, a shutter, and an air volume lower limit setting unit. The main casing is provided with a lower suction port, an upper suction port, and an air outlet. The shutter opens and closes the lower inlet. The air volume lower limit value setting unit sets the air volume lower limit value of the air volume blown from the air outlet. The air volume lower limit value setting unit sets the air volume lower limit value when the shutter of the lower suction port is open at least at a predetermined time to be larger than the air volume lower limit value when the shutter is closed.

Thereby, the air blown out from the blowout port is blown out with an air volume that is equal to or greater than a predetermined air volume lower limit value and blown away from the lower suction port. Thus, Ru can suppress a short circuit of air blown out from the air outlet is sucked into the lower suction port directly.

Moreover, the air conditioning indoor unit according to the first aspect of the present invention further includes an air volume setting reception unit. The air volume setting accepting unit accepts an air volume automatic setting or an air volume user setting in which the user specifies an air volume as the air volume setting. The predetermined time is a case where the air volume setting accepting unit accepts the air volume automatic setting.

  Accordingly, it is possible to suppress a short circuit at least in the case of automatic air volume setting while maintaining user satisfaction by giving priority to the air volume designation by the user.

An air conditioning indoor unit according to a second aspect of the present invention is the air conditioning indoor unit according to the first aspect , further comprising a shutter opening / closing control unit that controls the movement of the shutter of the lower suction port. When the air volume at the air outlet is set to a predetermined value or less based on the air volume user setting received by the air volume setting receiving unit, the shutter opening / closing control unit closes the shutter of the lower suction port.

  In the case where the air volume is set by the user, a short circuit may occur if the air volume at the air outlet is equal to or less than a predetermined value. Therefore, the shutter opening / closing controller closes the shutter at the lower air inlet. Thereby, the short circuit can be suppressed not only in the case of the air volume automatic setting but also in the case of the air volume user setting.

In the air conditioning indoor unit pertaining to the first aspect of the present invention, cut with suppressing short-circuit the air blown out from the blowout opening is sucked into the lower suction port directly. Further, it is possible to suppress a short circuit at least in the case of automatic air volume setting while maintaining user satisfaction by giving priority to the air volume designation by the user.

In the air conditioning indoor unit according to the second aspect of the present invention, short circuits can be suppressed not only in the case of air volume automatic setting but also in the case of air volume user setting.

It is sectional drawing of the air-conditioning indoor unit which concerns on one Embodiment of this invention. It is an enlarged side view of the blower outlet and lower suction port of FIG. It is sectional drawing which shows the mode at the time of operation | movement of an air conditioning indoor unit. It is a block diagram which shows the function structure and hardware structure of a control part. It is explanatory drawing which shows a part of operation part. It is an example of the flowchart which shows the operation | movement in an air volume lower limit setting. It is a schematic diagram showing a state where the shutter is opened and the flap angle θf is equal to or smaller than the flap threshold angle θth. It is a schematic diagram showing a state where the shutter is opened and the flap angle θf is larger than the flap threshold angle θth. It is an example of the flowchart which shows the operation | movement in an air volume lower limit setting. It is explanatory drawing which shows the case where a shutter exists in A position, B position, C position, and a closed position.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention.

<First Embodiment>
(1) External configuration of air conditioning indoor unit 10 (1-1) Overall configuration FIG. 1 is a cross-sectional view of an air conditioning indoor unit according to an embodiment of the present invention. In FIG. 1, the air conditioning indoor unit 10 is a wall-hanging type, and a main body casing 11, an indoor heat exchanger 13, an indoor fan 15, a bottom frame 17, a filter 25, and a control unit 41 are mounted.

  The main body casing 11 forms a three-dimensional space by the front grill 11a, the front panel 11b, and the back plate 11c, and the indoor heat exchanger 13, the indoor fan 15, the bottom frame 17, the filter 25, and the control unit 41 are formed in the three-dimensional space. It is settled. The front panel 11b covers the front surface of the front grill 11a, and an upper end of the front panel 11b is rotatably supported by the front grill 11a and can operate in a hinged manner. Moreover, the main body casing 11 is attached to the wall via the mounting plate 11d.

  The indoor heat exchanger 13 and the indoor fan 15 are attached to the bottom frame 17. The indoor heat exchanger 13 exchanges heat with the passing air. In addition, the indoor heat exchanger 13 has an inverted V shape in which both ends are bent downward in a side view, and the indoor fan 15 is positioned below the indoor heat exchanger 13. The indoor fan 15 is a cross-flow fan, blows air taken in from the room against the indoor heat exchanger 13 and then blows it into the room.

  An air outlet 19 is provided on the lower surface of the main casing 11. A flap 291 for guiding the air blown out from the air outlet 19 is rotatably attached to the air outlet 19. The flap 291 is driven by a motor (not shown) and can open and close the air outlet 19 as well as change the air blowing direction. The air outlet 19 is connected to the inside of the main body casing 11 by the air outlet passage 18, and the air outlet passage 18 is formed along the bottom frame 17 from the air outlet 19.

  Further, a lower suction port 21 is provided on the lower surface of the main casing 11 on the wall side with respect to the air outlet 19. The lower suction port 21 is connected to the inside of the main body casing 11 by the suction flow channel 16, and the suction flow channel 16 is formed along the bottom frame 17 from the lower suction port 21. That is, the suction channel 16 is adjacent to the blowout channel 18 with the bottom frame 17 interposed therebetween.

  The indoor air near the lower suction port 21 is sucked into the indoor fan 15 through the lower suction port 21, the suction flow path 16, the filter 25 and the indoor heat exchanger 13 by the operation of the indoor fan 15, and is blown out from the indoor fan 15. 18 is blown out from the air outlet 19.

  A filter 25 is disposed between the front grill 11 a of the main casing 11 and the indoor heat exchanger 13. The filter 25 removes dust contained in the air that flows in toward the indoor heat exchanger 13.

  An upper suction port 22 is provided at the front upper portion of the front grill 11a. The indoor air in the vicinity of the upper suction port 22 is sucked into the indoor fan 15 through the upper suction port 22, the filter 25, and the indoor heat exchanger 13 by the operation of the indoor fan 15, and is blown out from the indoor fan 15 through the blowout flow path 18. 19 is blown out.

  The control unit 41 is housed in the front portion of the main body casing 11, and controls the rotational speed of the indoor fan 15, adjusts the opening of the air outlet 19, adjusts the opening of the lower suction port 21, and adjusts the opening of the upper suction port 22. The command for.

(1-2) Configuration of Each Part (a) Air outlet 19 and air outlet opening / closing mechanism 29
FIG. 2 is an enlarged side view of the air outlet and the lower suction port illustrated in FIG. 1. In FIG. 2, the air outlet 19 is opened and closed by an air outlet opening / closing mechanism 29. The outlet opening / closing mechanism 29 includes a flap 291, a support shaft 292, and a flap drive motor 293.

  The flap 291 is an arc-shaped plate that is curved so that its cross-sectional shape protrudes to the outside of the air outlet 19, and one end in the width direction is close to the lower end of the bottom frame 17. The flap 291 is rotatable.

  The support shaft 292 is a shaft for the flap 291 to rotate, and is supported by the side wall of the main body casing 11 that intersects the virtual center axis of rotation.

  The flap drive motor 293 is a stepping motor with a built-in stepping motor or a reduction gear mechanism, and its rotation shaft is connected to a support shaft 292. When the state where the flap 291 is housed in the air outlet 19 is set as the origin position, the flap drive motor 293 rotates the rotating shaft according to the number of pulses applied, and the flap 291 rotates in the direction to open the air outlet 19.

(B) Lower suction port 21
The lower suction port 21 is located between the lower end of the bottom frame 17 and the lower end of the back plate 11c. As shown in FIG. 1, the lower suction port 21 is a part of the inlet of the suction flow path 16 and is an opening having a predetermined width from the lower end of the back plate 11 c toward the lower end of the bottom frame 17.

  Of the inlet of the suction channel 16, the space between the lower suction port 21 and the lower end of the bottom frame 17 is covered with a shielding plate 33. This is because the suction flow channel 16 and the blow flow channel 18 are adjacent to each other across the bottom frame 17, and a part of the blown air passes so as to stroke the lower end of the bottom frame 17 and enters the inlet of the suction flow channel 16. This is to prevent it. By disposing the shielding plate 33, the substantial inlet of the suction channel 16 can be moved away to the lower suction port 21.

(C) Lower suction opening / closing mechanism 31
A lower suction port opening / closing mechanism 31 is installed in the lower suction port 21. The lower inlet opening / closing mechanism 31 includes a shutter 311, a hinge 312, a link 313, and a drive motor 314.

  The shutter 311 has a size that can be fitted into the lower suction port 21 to close the lower suction port 21. The shutter 311 is rotatable, and the virtual central axis of the rotation is located near the corner between the bottom frame 17 and the shielding plate 33.

  The hinge 312 is a fulcrum for rotating the shutter 311, and is provided on the wall of the main casing 11 that intersects the virtual center axis of rotation. The hinge 312 and the shutter 311 are connected by a link 313.

  In order to prevent interference with the shielding plate 33 when the link 313 rotates together with the shutter 311, an escape portion (not shown) such as a slit is formed in the shielding plate 33 along the trajectory through which the link 313 passes.

  The drive motor 314 is a stepping motor or a stepping motor with a built-in reduction gear mechanism, and its rotation shaft is coupled to the hinge 312. When the state where the shutter 311 is housed in the lower suction port 21 is set as the origin position, the drive motor 314 rotates the rotation shaft in accordance with the number of applied pulses, and the shutter 311 rotates in a direction to open the lower suction port 21. .

(D) Upper suction port 22 and upper suction port opening / closing mechanism 32
As shown in FIG. 1, the upper suction port 22 is provided from the position facing the upper end of the front panel 11 b in the front grill 11 a to the center of the top surface. The upper suction port 22 is opened and closed by an upper suction port opening / closing mechanism 32. The upper suction opening / closing mechanism 32 includes a slide shutter 322.

(2) Hardware Configuration and Functional Configuration of Air Conditioning Indoor Unit 10 FIG. 3 is a cross-sectional view showing a state when the air conditioning indoor unit is in operation. Normally, when the air-conditioning indoor unit 10 is in operation, as shown in FIG. 3, the shutter 311 of the lower suction port 21 and the slide shutter 322 of the upper suction port 22 are controlled to be in the open state, and the flap 291 of the air outlet 19 is open. . Thus, air is sucked into the indoor fan 15 from the lower suction port 21 and the upper suction port 22 through the filter 25 and the indoor heat exchanger 13, and from the indoor fan 15 through the blowout flow path 18 to the flap 291 from the blowout port 19. Is blown out along. As described above, since the shutter 311 of the lower suction port 21 is controlled to be open when the air conditioning indoor unit 10 is in operation, when the amount of air blown from the air outlet 19 decreases, the air blown from the air outlet 19 is directly A phenomenon (so-called short circuit) that is sucked into the lower suction port 21 may occur.

  Therefore, when the shutter 311 of the lower suction port 21 is in the open state, the control unit 41 controls the lower limit value of the air volume of the air blown from the air outlet 19.

  The functional configuration and hardware configuration of the control unit 41 that performs such control will be described below with reference to FIG. FIG. 4 is a block diagram showing the functional configuration and hardware configuration of the control unit.

  The control unit 41 includes a CPU (Central Processing Unit) 60, a RAM (Random Access Memory) 61, and a ROM (Read Only Memory) 62.

(2-1) ROM 62
The ROM 62 stores a control program 90 for controlling the entire air conditioning indoor unit 10.

(2-2) RAM 61
The RAM 61 includes an air volume lower limit storage unit 80, an air volume storage unit 81, a shutter angle storage unit 82, and a flap angle storage unit 83.

  The air volume lower limit storage unit 80 stores the air volume lower limit Wthclose when the shutter 311 is closed and the air volume lower limit Wthopen set by the air volume lower limit setting unit 70. The air volume storage unit 81 stores the type of air volume setting received from the user by the air volume setting receiving unit 72 and the air volume controlled by the air volume control unit 71. The shutter angle storage unit 82 stores the shutter angle θs controlled by the shutter opening / closing control unit 73. The shutter angle θs is defined by an angle compared to the case where the shutter 311 is in the closed state (shutter angle θs = 0 °). The flap angle storage unit 83 stores the flap angle θf of the flap 291 controlled by the flap opening / closing control unit 74. The flap angle θf is defined by an angle formed by the flap 291 and the downward vertical direction.

  The RAM 61 temporarily stores a control program read from the ROM 62 by the CPU 60 and provides a work area for the CPU 60 to execute various functions.

(2-3) CPU 60
The CPU 60 includes an air volume lower limit setting unit 70, an air volume control unit 71, an air volume setting reception unit 72, a shutter opening / closing control unit 73, and a flap opening / closing control unit 74.

(A) Air volume lower limit setting unit 70
The air volume lower limit value setting unit 70 sets the air volume lower limit value Wthopen of the air volume blown from the air outlet 19. Specifically, the air volume lower limit setting unit 70 refers to the air volume storage unit 81, determines whether the air volume setting reception unit 72 has received automatic air volume setting, and refers to the shutter angle storage unit 82 to determine whether the shutter 311 It is determined whether the open state or the closed state. When the air volume lower limit setting unit 70 is in the air volume automatic setting state and the shutter 311 is in the open state, the air volume lower limit value setting unit 70 determines the air volume lower limit value Wthclose when the shutter 311 is in the closed state. Read from the lower limit storage unit 80. The air volume lower limit setting unit 70 sets the air volume lower limit value Wthopen when the shutter 311 is in an open state so as to be larger than the air volume lower limit value Wthclose when the shutter 311 is in a closed state. Therefore, the air blown out from the blowout port 19 is blown out with an air volume equal to or higher than a predetermined air volume lower limit value Wthopen under the control of the air volume control unit 71 described later, and is blown away from the lower suction port 21. Therefore, it is possible to suppress a short circuit in which the air blown out from the blowout port 19 is directly sucked into the lower suction port 21. The air flow lower limit setting unit 70 stores the set air flow lower limit Wthopen in the air flow lower limit storage unit 80.

  In the above description, the air volume lower limit setting unit 70 sets the air volume lower limit Wthopen when the shutter 311 is open to be larger than the air volume lower limit Wthclose when the shutter 311 is closed. In addition, the air volume lower limit setting unit 70 may set the air volume lower limit Wthopen when the shutter 311 is in an open state so that the air volume does not cause a short circuit. For example, when the shutter 311 is in the open state, the air volume that may cause a short circuit is experimentally detected, and the air volume lower limit setting unit 70 sets the air volume lower limit value Wthopen so as to be equal to or greater than the experimentally detected air volume. It may be set.

(B) Air volume setting reception unit 72
The air volume setting accepting unit 72 accepts, from the user, an air volume setting including an air volume automatic setting and an air volume user setting in which the user designates the air volume as a setting of the air volume blown from the air outlet 19. For example, the user inputs a desired air volume setting by controlling the operation unit 100. FIG. 5 is an explanatory diagram showing a part of the operation unit. The operation unit 100 is provided with, for example, an air volume automatic setting button 101 for automatically controlling the air volume, a rapid wind button 102 for designating the air volume by the user, a strong wind button 103, a low wind button 104, and a light wind button 105. It is assumed that the air volume increases in the order of light wind, light wind, strong wind, and steep wind. The user operates the desired button to set the air volume for the air conditioning indoor unit 10. The air volume setting receiving unit 72 stores the type of air volume setting received from the user in the air volume storage unit 81.

(C) Air volume control unit 71
The air volume control unit 71 controls the air volume blown from the air outlet 19 based on the air volume setting received by the air volume setting receiving unit 72 and stores the air volume in the air volume storage unit 81. For example, when the air volume setting receiving unit 72 receives the air volume automatic setting, the air volume control unit 71 controls the air volume to be equal to or higher than the air volume lower limit value Wthopen set by the air volume lower limit setting unit 70. That is, when the air volume setting receiving unit 72 receives the air volume automatic setting, the user allows the air to be blown out from the air outlet 19 with an arbitrary air volume. In that case, the air volume lower limit setting unit 70 performs control so that the air volume lower limit Wthopen when the shutter 311 of the lower inlet 21 is open is larger than the air volume lower limit Wthclose when it is closed. And the air volume control part 71 is controlled so that it may become the air volume more than the controlled air volume lower limit Wthopen. Thereby, the short circuit by which the air which blown off from the blower outlet 19 is directly sucked into the lower inlet 21 can be suppressed.

  The air volume control unit 71 controls the air volume based on the air volume user setting when the user specifies the air volume. Specifically, for example, when the air volume setting accepting unit 72 accepts the fine air flow setting by the operation of the light air button 105, the air air volume control unit 71 performs control so that the air volume becomes a slight air volume. As described above, when the air volume setting receiving unit 72 receives the air volume user setting, the air is blown out from the outlet 19 with the air volume desired by the user. Therefore, a short circuit can be suppressed at least in the case of automatic air volume setting while maintaining user satisfaction with priority given to the air volume designation by the user.

(D) Shutter opening / closing control unit 73
When the air conditioning indoor unit 10 starts operation, the shutter opening / closing control unit 73 controls the movement of the shutter 311 by controlling the lower inlet opening / closing mechanism 31 so that the lower inlet 21 changes from the closed state to the opened state. When the operation of the air conditioning indoor unit 10 is stopped, the shutter opening / closing control unit 73 controls the movement of the shutter 311 to close the lower suction port 21.

  Note that the shutter opening / closing control unit 73 controls the shutter 311 to be in a closed state when the air volume setting is received by the air volume setting receiving unit 72 as the air volume setting and the air volume is equal to or less than the predetermined value Wα. Good. That is, when the air volume setting receiving unit 72 receives the air volume user setting, the air volume control unit 71 blows out air from the outlet 19 with the air volume desired by the user. In this case, since a short circuit may occur when the air volume at the air outlet 19 is equal to or less than the predetermined value Wα, the shutter opening / closing controller 73 controls the shutter 311 of the lower inlet 21 to be closed.

  The predetermined value Wα, which is a reference for closing the shutter, is included below the air volume lower limit value Wthopen. For example, as the air volume user setting, an air volume that increases in the order of the above-described light wind, weak wind, strong wind, and steep wind is provided. Here, the weak wind is set to a predetermined value Wα. At this time, for example, it is assumed that the air volume increases in the order of light wind, light wind (predetermined value Wα), air volume lower limit Wthopen, strong wind, and steep wind. When a light wind or a light wind (predetermined value Wα) is set as the air volume user setting, the air volume is equal to or less than the predetermined value Wα, so the shutter opening / closing control unit 73 controls the shutter 311 of the lower suction port 21 to be closed. On the other hand, when a strong wind or a steep wind is set as the air volume user setting, since the air volume is larger than the predetermined value Wα, the shutter opening / closing control unit 73 controls the shutter 311 of the lower suction port 21 to the open state. The short circuit can be suppressed not only when the air volume is automatically set but also when the air volume is set by the control as described above.

(E) Flap opening / closing control unit 74
The flap opening / closing control unit 74 controls the movement of the flap 291 by controlling the air outlet opening / closing mechanism 29 based on the wind direction set by a wind direction setting unit (not shown).

(3) Operation Next, the operation in setting the air volume lower limit value will be described with reference to FIG. FIG. 6 is an example of a flowchart showing the operation in setting the air volume lower limit value.

  Step S10: The air volume lower limit setting unit 70 refers to the air volume storage unit 81 and determines whether the air volume setting reception unit 72 has received the automatic air volume setting or the air volume user setting. The air volume lower limit setting unit 70 executes step S11 in the case of air volume automatic setting. On the other hand, in the case of the air volume user setting, step S13 is executed.

  Step S11: The air volume lower limit setting unit 70 refers to the shutter angle storage unit 82 to determine whether the shutter 311 is in an open state or a closed state. If the current shutter angle θf is larger than that in the closed state (shutter angle θs = 0 °), the air volume lower limit setting unit 70 determines that the shutter 311 is in the open state. The air volume lower limit setting unit 70 executes Step S12 when the shutter 311 is in the open state. On the other hand, the air volume lower limit setting unit 70 ends the process when the shutter 311 is in the closed state.

  Step S12: When the air volume lower limit setting unit 70 is in the air volume automatic setting state and the shutter 311 is in the open state, the air volume lower limit value Wthopen when the shutter 311 is in the open state and the shutter 311 in the closed state Is set to be larger than the air volume lower limit value Wthclose.

  Step S13: The air volume control unit 71 controls the air volume based on the air volume user setting.

  Step S14: The shutter opening / closing control unit 73 determines whether or not the air volume based on the air volume user setting is equal to or less than a predetermined value Wα. The shutter opening / closing control unit 73 executes step S15 when the air volume based on the air volume user setting is equal to or less than the predetermined value Wα. On the other hand, when the air volume based on the air volume user setting is larger than the predetermined value Wα, the shutter opening / closing controller 73 ends the process.

  Step S15: Since the air volume based on the air volume user setting is equal to or less than the predetermined value Wα, the shutter open / close control unit 73 controls the shutter 311 of the lower suction port 21 to be closed in order to suppress a short circuit.

(4) Features (4-1)
When the amount of air blown from the air outlet 19 decreases, a short circuit in which the air blown from the air outlet 19 is directly sucked into the lower air inlet 21 may occur.

  Therefore, the air volume lower limit setting unit 70 sets the air volume lower limit Wthopen when the shutter 311 of the lower suction port 21 is open at least at a predetermined time to be larger than the air flow lower limit Wthclose when it is closed. Therefore, the air blown out from the blowout port 19 is blown out with a flow rate equal to or greater than the predetermined airflow lower limit value Wthopen and blown away from the lower suction port 21. Therefore, it is possible to suppress a short circuit in which the air blown out from the blowout port 19 is directly sucked into the lower suction port 21.

(4-2)
The air conditioning indoor unit 10 blows air out of the air outlet 19 with the air volume desired by the user when the air volume setting receiving unit 72 receives the air volume user setting. When the air volume setting accepting unit 72 accepts the air volume automatic setting, the user allows the air to be blown from the air outlet 19 with an arbitrary air volume. In that case, the air volume lower limit value setting unit 70 makes the air volume lower limit value Wthopen when the shutter 311 of the lower inlet 21 is open larger than the air volume lower limit value Wthclose when the shutter 311 of the lower suction port 21 is open in order to suppress a short circuit. To control. Therefore, a short circuit can be suppressed at least in the case of automatic air volume setting while maintaining user satisfaction with priority given to the air volume designation by the user.

(4-3)
The air conditioning indoor unit 10 blows air out of the air outlet 19 with the air volume desired by the user when the air volume setting receiving unit 72 receives the air volume user setting. In this case, if the air volume at the air outlet 19 is equal to or less than the predetermined value Wα, a short circuit may occur, so the shutter opening / closing control unit 73 closes the shutter 311 of the lower inlet 21. Therefore, a short circuit can be suppressed not only in the case of air volume automatic setting but also in the case of air volume user setting.

  Note that the predetermined value Wα, which is a reference for closing the shutter 311, is included below the lower limit of the air volume. For example, it is assumed that the air volume user setting includes a light wind, a weak wind having a larger air volume than the light wind, a strong wind having a larger air volume than the weak wind, and a steep wind having a larger air volume than the strong wind. Further, it is assumed that the weak wind is a predetermined value Wα. At this time, for example, it is assumed that the air volume increases in the order of light wind, light wind (predetermined value Wα), air volume lower limit Wthopen, strong wind, and steep wind. When light wind and light wind are set as the air volume user setting, the air volume is equal to or less than the predetermined value Wα, so the shutter open / close control unit 73 closes the shutter 311 of the lower suction port 21. On the other hand, when a strong wind and a steep wind are set as the air volume user setting, since the air volume is larger than the predetermined value Wα, the shutter opening / closing control unit 73 opens the shutter 311 of the lower suction port 21.

Second Embodiment
(1) External configuration of air-conditioning indoor unit 10 The external configuration of the air-conditioning indoor unit 10 according to the second embodiment is the same as that of the first embodiment, and a description thereof will be omitted.

(2) Functional configuration In the second embodiment, unlike the first embodiment, the shutter 311 of the lower suction port 21 is opened when the vertical air direction of the air blown out from the air outlet 19 is lower than a predetermined angle. The air volume lower limit value Wthopen in the case of the state is controlled. Since the other points are the same as those of the first embodiment, only functional configurations different from those of the first embodiment will be described below.

(A) Flap angle storage unit 83
The flap angle storage unit 83 stores a flap threshold angle θth in addition to the flap angle θf of the flap 291 controlled by the flap opening / closing control unit 74. The flap threshold angle θth is defined, for example, by an angle formed between the flap 291 and the lower side in the vertical direction, and may be about 30 °, for example. In other words, for example, the vertical wind direction is about 60 ° with respect to the horizontal direction.

(B) Air volume lower limit setting unit 70
The air volume lower limit setting unit 70 reads the flap angle θf and the predetermined flap threshold angle θth with reference to the flap angle storage unit 83. The air volume lower limit setting unit 70 sets the air volume lower limit value Wthopen of the air volume blown from the air outlet 19 based on the comparison result between the current flap angle θf and the flap threshold angle θth. The setting of the air volume lower limit value Wthopen will be specifically described with reference to FIGS. 7 and 8. FIG. 7 is a schematic diagram illustrating a state where the shutter is opened and the flap angle θf is equal to or smaller than the flap threshold angle θth. FIG. 8 is a schematic diagram showing a state where the shutter is opened and the flap angle θf is larger than the flap threshold angle θth.

  First, the air volume lower limit setting unit 70 refers to the air volume storage unit 81 to determine whether or not the air volume setting reception unit 72 has received the air volume automatic setting, and refers to the shutter angle storage unit 82 to open the shutter 311. Determine whether it is closed or not. The air volume lower limit setting unit 70 refers to the flap angle storage unit 83 and compares the flap angle θf with a predetermined flap threshold angle θth. In the case of FIG. 7, the air volume lower limit setting unit 70 determines that the flap angle θf is equal to or smaller than the flap threshold angle θth. When the flap angle θf is equal to or smaller than the flap threshold angle θth, the air from the blowout port 19 is sucked into the lower suction port 21 and a short circuit is likely to occur. In this case, the air volume lower limit setting unit 70 sets the air volume lower limit Wthopen when the shutter 311 is in an open state so as to be larger than the air volume lower limit Wthclose when the shutter 311 is in a closed state. Therefore, the air blown out from the blowout port 19 is blown out with an air volume equal to or higher than a predetermined air volume lower limit value Wthopen under the control of the air volume control unit 71 described later, and is blown away from the lower suction port 21. Therefore, it is possible to suppress a short circuit in which the air blown out from the blowout port 19 is directly sucked into the lower suction port 21. Note that, similarly to the first embodiment, the air volume lower limit value Wthopen may be set to be equal to or larger than the air volume that does not cause an experimentally obtained short circuit.

  On the other hand, the air volume lower limit setting unit 70 determines whether the flap angle θf is larger than the flap threshold angle θth when the air volume is automatically set and the flap 291 is in FIG. 8 when the shutter 311 is open. In this case, the air volume lower limit setting unit 70 estimates that there is no occurrence of a short circuit and does not particularly set the air volume lower limit Wthopen.

  Regarding other points, the function of the air volume lower limit setting unit 70 is the same as that of the first embodiment.

(3) Overall Operation Next, the overall operation in setting the air volume lower limit value will be described with reference to FIG. FIG. 9 is an example of a flowchart showing the overall operation in setting the air volume lower limit value. The operation of the second embodiment is the same as that of the first embodiment except for the difference in step S11a, and will be briefly described below.

  Steps S10 and S11: The air volume lower limit setting unit 70 executes step S11a when the air volume is automatically set and the shutter 311 is in the open state. The air volume lower limit setting unit 70 executes step S13 in the case of air volume user setting.

  Step S11a: The air volume lower limit setting unit 70 refers to the flap angle storage unit 83 to determine whether or not the flap angle θf is equal to or smaller than the flap threshold angle θth. The air volume lower limit setting unit 70 executes step S12 when the flap angle θf is equal to or smaller than the flap threshold angle θth. If the flap angle θf is larger than the flap threshold angle θth, the process is terminated.

  Step S12: The air volume lower limit setting unit 70 is in the air volume automatic setting state, when the shutter 311 is in the open state, and when the flap angle θf is equal to or less than the flap threshold angle θth, the shutter 311 is in the open state. In this case, the air volume lower limit value Wthopen is set to be larger than the air volume lower limit value Wthclose when the shutter 311 is in the closed state.

  Steps S13 to S15: The air volume control unit 71 controls the air volume based on the air volume user setting. The shutter opening / closing control unit 73 controls the shutter 311 of the lower suction port 21 to be closed in order to suppress the short circuit when the air volume based on the air volume user setting is equal to or less than the predetermined value Wα.

(4) Features When the vertical air direction of the air from the air outlet 19 is lower than a predetermined angle, the air blown out from the air outlet 19 is blown out in a direction approaching the lower air inlet 21 and sucked into the lower air inlet 21. It becomes easy to be. The predetermined angle is, for example, a case where the vertical wind direction is about 60 ° with respect to the horizontal direction. In the case of the up-and-down wind direction in which air from the air outlet 19 is likely to be sucked into the lower suction port 21, the air volume lower limit setting unit 70 closes the air volume lower limit value Wthopen when the shutter 311 of the lower suction port 21 is open. The air volume is controlled to be larger than the lower limit value Wthclose. Thereby, a short circuit can be suppressed.

<Other embodiments>
(A) Modified Example In the above embodiment, the air volume lower limit setting unit 70 determines whether the shutter 311 of the lower suction port 21 is in the open state or the closed state, and sets the air volume lower limit value Wthopen. . In this modification, the air volume lower limit setting unit 70 may set the air volume lower limit Wthopen according to the degree of the shutter angle θs.

  The setting of the air flow lower limit value Wthopen according to the shutter angle θs by the air flow lower limit setting unit 70 will be described with reference to FIG. FIG. 10 is an explanatory diagram illustrating a case where the shutter 311 is in the A position, the B position, the C position, and the closed position.

  The shutter 311 moves away from the closed position in the order of C position, B position, and A position, and the shutter angle θs increases. The shutter 311 approaches the flap 291 as it moves away from the closed position. Therefore, as the shutter 311 moves away from the closed position, the air blown out along the flap 291 is more likely to be sucked into the lower suction port 21. Therefore, the air volume lower limit setting unit 70 sets the air volume lower limit value Wthopen to increase in the order in which the shutter 311 is at the C position, the B position, and the A position (air volume lower limit value Wthopen (C position) <air volume lower limit value Wthopen ( B position) <Air flow lower limit value Wthopen (A position)). Accordingly, it is possible to suppress a short circuit while finely setting the air volume lower limit value Wthopen according to the shutter angle θs.

  Further, the air volume lower limit setting unit 70 may set the air volume lower limit Wthopen in consideration of the flap angle θf as shown in the second embodiment in addition to the shutter angle θs. For example, when the shutter 311 is at the A position and the flap angle θf is larger than the flap threshold angle θth, the air volume lower limit setting unit 70 sets the air volume lower limit Wthopen based only on the shutter angle θs. On the other hand, when the shutter 311 is in the A position and the flap angle θf is equal to or smaller than the flap threshold angle θth, the air volume lower limit setting unit 70 sets the air volume lower limit Wthopen based on both the shutter angle θs and the flap angle θf. .

(B) Modification In the above-described embodiment, the shutter 311 is a rotary type around the virtual central axis. However, the shape is not particularly limited as long as the lower suction port 21 can be opened and closed. For example, the shutter 311 is a slide type. May be.

  As described above, according to the present invention, an air volume indoor unit that can suppress a short circuit can be provided, which is useful for a wall-mounted air conditioning indoor unit.

DESCRIPTION OF SYMBOLS 10 Air-conditioning indoor unit 11 Main body casing 11a Front grille 11b Front panel 13 Indoor heat exchanger 15 Indoor fan 16 Suction flow path 17 Bottom frame 18 Blowing flow path 19 Air outlet 21 Lower air inlet 22 Upper air inlet 29 Air outlet opening / closing mechanism 31 Below Suction port opening / closing mechanism 32 Upper suction port opening / closing mechanism 41 Control unit 70 Air volume lower limit value setting unit 71 Air volume control unit 72 Air volume setting receiving unit 73 Shutter opening / closing control unit 74 Flap opening / closing control unit 80 Air volume lower limit value storage unit 81 Air volume storage unit 82 Shutter Angle storage unit 83 Flap angle storage unit 291 Flap 311 Shutter

JP 2001-116346 A

Claims (2)

A main body casing (11) provided with a lower suction port (21), an upper suction port (22) and an air outlet (19);
A shutter (311) for opening and closing the lower suction port;
An air volume lower limit setting unit (70) for setting an air volume lower limit value of the air volume blown from the air outlet;
An air volume setting receiving unit (72) for receiving an air volume automatic setting or an air volume user setting by which a user specifies an air volume as a setting of the air volume blown from the air outlet.
With
The air volume lower limit value setting unit is a flow rate lower limit value when the shutter of the lower suction port is in an open state, and an air flow lower limit value when the air flow setting is closed, at least when the air volume setting receiving unit is receiving the air volume automatic setting. Air conditioning indoor unit that is set larger than the value. A shutter opening / closing controller (73) for controlling the movement of the shutter of the lower suction port;
If the air volume of the air outlet on the basis of the air volume user setting the air volume setting accepting unit receives is set to a predetermined value or less, the shutter opening and closing control unit closes the shutter of the lower suction port, claim air conditioning indoor unit as described in 1.

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