JPS61276653A - Indoor unit of air conditioner - Google Patents

Abstract

PURPOSE:To make constant the optimum downward blow angle regardless of the ratio of the downward air flow amount so that the downward air flow does not change even when the air flow speed is changed by forming an upper guide surface and a lower guide surface for guiding the air flow to the blow-off port side, on the upstream sides of a first blow-off port and a second blow-off port so that the amount of the air flow from the second blow-off port becomes constant when the air flow speed is changed. CONSTITUTION:A lower guide surface 14 constituting a blow-off passage 12 is constituted of a guide wall 14a inclined slantly downward from a heat exchanger 4 and an arcuate guide wall 14b led to a second blow-off port 7. A control vane 15 adjusts the air flow ratio to first and second blow-off ports 6 and 7 and formed into a substantially chevlon-shape for maintaining the opti mum downward blow angle at a constant value. The control vane 15 when rotated the tip end thereof has a length enough for reaching and engaging with the upper guide surface 13 and the lower guide surface 14. A control circuit for controlling the rotational angle position of the control vane 15 when chang ing over the air flow speed so that the air flow amount from the second blow- off port 7 becomes constant is provided.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an indoor unit of an air conditioner, and is particularly designed to improve the comfort of the indoor environment.

[Conventional technology]

A conventional indoor unit of an air conditioner will be explained with reference to FIG. FIG. 5 is a sectional view of an indoor unit applied to a ceiling-mounted air conditioner disclosed in, for example, Japanese Utility Model Application Publication No. 58-20147. In the same figure, the overall reference numeral 1 is the indoor unit main body, and 2 is the main body casing of the knitted main body 1 from the indoor unit.Inside the main body casing 2, a blower 3 and a heat exchanger 4 located on the discharge side thereof are arranged. has been done. 5 is a drain pan located below the heat exchanger 4 and provided inside the main body casing, 6 is a first air outlet provided on the front surface of the main body casing 2, and 7 is a second air outlet provided on the lower surface of the main body casing 2. The outlet 8 is a suction grill provided on the main body casing 2 corresponding to the blower 3, and 9 is a vane for opening and closing the second outlet. The indoor unit main body 1 configured as described above is installed so as to fit on the ceiling surface 10 and side wall surface 11 in the room. In the ceiling-mounted air conditioner indoor unit with the above configuration,
Indoor air sucked in from the suction grille 8 when the blower 3 is activated is sent through the blower 3 to the heat exchanger 4, where the air cooled or heated by heat exchange is sent indoors from the first Suita outlet 6 and the second blowout lower. is blown out. Furthermore, during cooling operation, the opening/closing vane 9 is set horizontally as shown by the broken line in FIG. 5 to blow out the full amount of air from the first air outlet 6, and during heating, the opening/closing vane 9 is set vertically as shown by the solid line in FIG. By setting the condition to
The air will be blown into the room from Suita Roa.

In an indoor unit of a ceiling-mounted air conditioner, in order to improve the comfort during heating operation, it is absolutely necessary for the jet stream to reach the body surface. Furthermore, if the area of the room to be air-conditioned is large, it is necessary to increase the amount of jet flow. Furthermore, according to experiments conducted by the inventors of the present application, the angle of downward blowing of the jet is best between 65° and 75°; if this angle is small, the temperature difference between the upper and lower parts of the room becomes large, causing discomfort; It has been confirmed that if the angle is too large, the warm air will not spread sufficiently. On the other hand, if the air jet from the indoor unit shines directly onto the heads of people in the room, it will create a so-called draft feeling and be uncomfortable, so it is recommended to reduce the jet area and the size of the jet. It becomes necessary. However, the opening/closing vane 9 of the indoor unit in the above-mentioned conventional ceiling-mounted air conditioner has a simple flat plate structure and its size is about 4 times the area of the first outlet, so the vane cannot be rotated. When some hot air is blown downward,
If the indoor unit is mounted high on the ceiling or if the room is large, the downward jet flow becomes relatively small and sufficient comfort cannot be obtained. In addition, with an air outlet that adjusts the angle of the jet with a single air outlet, as shown in Figure 5, even if the downward jet angle is set at the optimal 65° to 75°, the jet will become too large. There was a problem that the draft area was large. This invention was made in order to solve the above-mentioned problems, and allows the downward blowing air volume ratio of the indoor unit main body to be arbitrarily adjusted within a wide range, and also allows the optimum downward blowing angle to be adjusted regardless of the downward blowing air volume ratio. To provide an indoor unit of an air conditioner in which the angle of downward blowing is kept constant and the downward blowing angle does not change even when the wind speed is changed. [Measures for Solving the Problems 152] The indoor unit of the air conditioner according to the present invention has air outlets located upstream of the first air outlet and the second air outlet provided on the front and front lower surfaces of the indoor unit main body, respectively. An upper guide surface and a lower guide surface are respectively formed for guiding wind toward the outlet side, and a control vane is horizontally rotatable and has a structure that reaches both guide surfaces and can open and close each of the air outlets, and further Means is provided for rotating the control vane so that the amount of air from the second outlet becomes constant when the wind speed is switched.

[For production]

In this invention, by rotating the control blade, the downward blowing air volume ratio can be varied from approximately 0 to 100%, and the downward blowing angle of the wind from the second outlet can be adjusted by rotating the control blade. In addition, when the wind speed is changed during heating, the control blade rotation operation means operates to rotate the control blade to an arbitrary angle position, which causes the second air outlet to Always keep the air volume constant.

【Example】

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIGS. 1 and 2 are sectional views of an indoor unit for an air conditioner according to the present invention, respectively, and each shows the blowing state during cooling and heating. In the same figure, an indoor unit main body 1 is equipped with a main body casing 2, a blower 3, a heat exchanger 4, and a drain pan 5, as in FIG. A first Suita outlet 6 that opens and a second Suita lower that opens downward are provided, and these air outlets 6°7
have a five-figure arrangement. Reference numeral 13 denotes an upper guide surface constituting the above-mentioned blowout passage 12, which is composed of a horizontal wall 13a leading to the first Suita outlet 6, and a linear guide wall 13b extending diagonally upward from the upstream end of this guide wall 13a toward the upstream side. has been done. Reference numeral 14 designates a lower guide surface that also constitutes the Suita passage 12, which includes a guide wall 14a1 that slopes diagonally downward from the lower end side of the heat exchanger 4 toward the second blowout lower, and a guide wall 14a1 that extends from the downstream end of the guide wall 14a to the second Suita passageway 12. It is composed of an arcuate guide wall 14b extending to the lower part. 15 is on the first blowing lower side in the blowing passage 12,
A control vane is rotatably arranged to open and close the first and second blowout ports 6 and 7. The control vane 15 adjusts the air volume ratio to the first and second blowout ports 6 and 7 and provides the optimum airflow. This is to maintain the blowing angle constant, and for this purpose, the control blade 15 is formed into a substantially ``he'' shape, and a shaft 16 is provided protruding from both ends of the ``he'' shape. The control blade 15 is horizontally and rotatably pivotally mounted within the main body casing 2 by the shaft 16. Further, the rotating tip edge 15a of the control blade 15 is such that the control blade 15 is rotated around the shaft 16 at the first position.
When the control blade is rotated to a state where the Suita port 6 is closed and a state where the second Suita lower is closed, the tip thereof reaches and engages the upper guide surface 13 and the lower guide surface 14, so that the control blade 15 rotation angles are regulated. Note that in FIGS. 1 and 2, the same reference numerals as in FIG. 5 indicate the same parts. Figure 3 shows the rotation angle position of the control blade 15 at the time of wind speed switching.
2 shows a control circuit diagram for controlling the air volume from the Suita lower to be constant. In the figure, 17 is an AC power supply, and the power line connecting this AC power supply 17 and the blower has Ij! Chamber switch 1
8 and the wind speed changeover switch 19 for heating, and a series circuit of the cooling switch 20 and the wind speed changeover switch 21 for cooling are connected in parallel. The wind speed changeover switch 19b during heating includes a strong notch switch 19a1, a middle notch switch 19b, and a weak notch switch 19c, and the wind speed changeover switch 21 during cooling includes a strong notch switch 21a and a weak notch switch 21b. . Further, in FIG. 3, 22 is an auxiliary relay that is energized when the strong notch switch 19a of the wind speed changeover switch 19 during heating is turned on, and 23 is the same (wind speed changeover switch 19
An auxiliary relay 24 is energized when the middle notch switch 19b is turned on, an auxiliary relay 24 is energized when the weak notch switch 19c of the wind speed changeover switch 19 is turned on, and 25 is an auxiliary relay that is energized when the air conditioning operation switch 20 is turned on. This is an auxiliary relay that is energized when the
2 to 25 are normally open contacts 22a and 23a, respectively. 24a, 25a, and control! Normally closed contacts 22B and 23B are opened according to the rotation angle of [15]. It has 24B and 25B. Normally closed contact 22B is control N
The normally closed contact 23B opens when the rotation angle θ of the control 1i15 is 30 degrees, and the normally closed contact 24B opens when the rotation angle θ of the control 1i15 is 40 degrees.
Generally, the normally closed contact 25B opens when the rotation angle θ of the control 'R15 is Oo. 26 is the above-mentioned auxiliary relay 22-2
This electric motor 26 is directly connected to the shaft 16. Next, the operation of this embodiment configured as described above will be explained. When the air conditioner is in cooling operation, the cooling switch 20 is turned on, and the strong notch switch 21a of the wind speed changeover switch 21 is turned on.
When turned ON, the auxiliary relay 25 is energized and its normally open contacts 26. a is closed. Therefore, (17)−(20
)-(25a)-(25B)-(26)-(17), the control'R drive motor 26 is started, and the control'R
15 in the direction of a rotation angle of 0°. This results in
When the control blade 15 reaches a rotation angle θ=0° (horizontal state in FIG. 1), the normally closed contact 25B is opened and the electric motor 26 is stopped. At this time, since the strong notch switch 21a is turned on, the blower 3 is in strong operation 9, which causes the suction grill 8
The indoor air sucked in from the first
The entire amount of air is blown out from the outlet 6. Also, during cooling operation, turn on the weak notch switch 21a.
If the switch is made to
6 is rotated, the second Suita lower is closed by the control blade 15 as shown in FIG. 1, and all of the cool air is blown into the room from the first Suita port 6 by the blower 3 operating at low speed. In addition, when heating the air conditioner, the heating switch 1
8 and turn on the strong notch switch 19a of the wind speed selector switch 19, the auxiliary relay 22 is energized.
By closing the normally open contact 22a, (17)-(18)
-(19a)-(22m) -(22B)-(26)-
The electric motor 26 is started in the closed circuit of (17), and the control vane 15 is rotated from the closed state of the second air outlet shown in FIG. 1 in the opening direction. When the rotation angle θ of the control blade 15 reaches 30° (the state indicated by the broken line in FIG. 2), the normally closed contact 22B opens and the motor 26
stops. At this time, the blower 3 is switched to the strong notch switch 1.
9a is ON, the strong operation is performed, and the indoor air sucked in from the suction grille 8 is heated by the heat exchanger 4 and blown out from the first outlet 6 and the second Suita lower. During heating, when the middle notch switch 19b of the wind speed changeover switch 19 is turned ON, the auxiliary relay 23 is energized and its normally open contact 23a is closed, so the control blade drive electric motor 26 is started again and the control The blade 15 is further rotated from the position shown by the broken line in FIG. 2, and the rotation angle θ is 4.
When the temperature reaches 0°, the normally closed contact 23B opens and the motor 26 stops. At this time, the blower 3 is in a medium speed operation state, and accordingly, the indoor air sucked from the suction grill 8 is heated by the heat exchanger N4.
The air is heated and blown into the room from the first Suita port 6 and the second blow-out lower at an air volume ratio according to the rotation angle of the control blade. In addition, the weak notch switch 19c of the wind speed changeover switch 19
When turned on, the auxiliary relay 24 is energized, and by closing its normally open contact 24a, the motor 26 is started again.
The control blades 15 are further rotated. Then, when the rotation angle θ reaches 55'', the normally closed contact 24B opens and the electric motor 26 stops. At this time, the blower 3 enters weak operation by turning on the weak notch switch 19c, and this causes the suction grill Indoor air sucked in from the control blade 8 is heated by the heat exchanger 4, and is blown into the room from the first Suita outlet 6 and the second blowout lower at an air volume ratio corresponding to the rotation angle of the control blade. At this time, by stopping the control 6GTS at a predetermined angular position according to the wind speed, hot air is blown into the room from the first outlet 6 and the second Suita lower.
The hot air that has passed through the lower end of the heat exchanger 4 adheres to the arcuate guide wall 14a of the lower guide surface 14 due to the Coanda effect, and flows downward at an angle. Figure 4 is a graph showing the experimental results in the above example, where the horizontal axis is the angle θ of the control blade, and the vertical axis is the downward blowing air volume ratio (
(lower air volume/total air volume) and lower air angle θ. The curve 1111 indicates the air volume ratio, and the curve 1 indicates the downward blow angle. As is clear from this characteristic diagram, the downward blowing air volume ratio is
It has been proven that it is possible to change the angle up to 100% and that the downward blow angle can be made almost constant over the entire control blade angle. On the other hand, during heating, the warm air blown downward from the second Suita lower has a large effect on improving the vertical temperature distribution in the room, and securing the necessary air volume becomes an important issue. Therefore, in this embodiment, the total air volume is 18rn'/s.
+n In the indoor unit of the ceiling-mounted air conditioner, the second
Assuming that the required air volume from the blowout lower is greater than or equal to 9rn'/win, the air volume set by the wind speed selector switch 19 is set to a strong notch: 18 rr? /win, medium notch: 15 rn'/+5in1 weak notch: 12 rn
'/sin, the rotation angle θ of the control blade 15 is automatically changed to 30'' and 400.55'' according to this air volume, so regardless of the wind speed switching, the rotation angle θ of the control blade 15 is automatically changed from 2nd Suita lower to The air volume can be maintained at a constant value of 9ni"/win, which improves the vertical temperature distribution in the room, reduces the difference in temperature between the top and bottom, and reduces the influence of drafts from the second Suita lower, making it comfortable. However, if the control blade 15 does not change in response to the wind speed change, that is, if it is fixed, for example, if the rotation angle of the control blade 15 is 55 degrees, the air volume from the second blowout lower will change depending on the wind speed change. The required air volume can be secured regardless of the situation, but the influence of the draft caused by the Suita airflow is significant.Also, when the rotation angle of the control blade is 30°, the air volume from the second Suita lower is sufficient in strong operation (18r+1″/m1n). However, as the mode of operation becomes moderate or weak, the air volume becomes insufficient, resulting in an indoor environment with a large temperature difference between the top and bottom of the room. Table [1] shows the position of the control vane and the air volume value from each outlet at the time of the above-mentioned wind speed switching. Table (1) However, strong: 18 rn'/win, medium: 15 m"/■in, weak: 12 rn"/sin

【Effect of the invention】

As described above, according to the present invention, the first air outlet and the second air outlet
Provided on the air outlet and the front and lower front of the indoor unit body,
In addition, an upper guide surface and a lower guide surface are provided on the upstream side of each outlet, and control blades that reach each guide surface and can open and close each outlet can be rotated horizontally. Furthermore, since the rotation angle of the control blade can be changed in accordance with the wind speed switching, it is possible to obtain any air volume ratio while keeping the optimum downward blow angle, and also to change the wind speed during heating. Also, the amount of air from the second outlet can be kept constant at all times, making it possible to air condition the room with a small difference in temperature between the upper and lower sides and providing a comfortable environment with less draft area.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of the indoor unit of the air conditioner according to the present invention, FIG. 2 is a cross-sectional view showing the Suita state of the indoor unit during heating, and FIG. FIG. 4 is a characteristic diagram showing experimental results in an embodiment of the present invention, and FIG. 5 is a sectional view showing a conventional indoor unit of an air conditioner. 1... Indoor unit main body, 2... Main body casing, 3
・Blower, 4... Heat exchanger, 6... First outlet, 7
...Second air outlet, 8...Suction grille, 12...Blowout passage, 13...Upper guide surface, 14...Lower guide direction, 15...
- Control blade, 18 - Heating switch, 19.20... Wind speed selection switch, 20. ...Cooling switch, 22-2
5...Auxiliary relay, 26...Control blade drive electric motor. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa (and 2 others) Figure 4-4I/Gujo~IθJ

Claims (1)

[Claims] A first air outlet and a second air outlet are provided on the front and lower front surfaces of the indoor unit main body having the blower and heat exchanger, respectively, and an upper guide surface for guiding air to the air outlet is provided on the upstream side of each air outlet. and a lower guide surface, and horizontally and rotatably provided control blades that reach both guide surfaces and can open and close each of the air outlets, and furthermore, when the air speed is changed during heating, An indoor unit for an air conditioner, comprising means for rotating the control blade so that the amount of air from the second outlet is constant.