JP5030602B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner, and more particularly to a floor-standing air conditioner having an air conditioning function.

  In order to make the indoor environment comfortable, an air conditioner that sends air conditioned air into the room has been conventionally used. As an example of such an air conditioner, a floor-standing type air conditioner used on the floor disclosed in Patent Document 1 will be described. As shown in FIG. 15, in this type of air conditioner 101, first, a suction port 103 for taking indoor air into the housing 102 is provided near the front center of the housing 102.

  In addition, an upper blowout port 104 is provided on the upper surface portion of the housing 102 for blowing out the air taken in from the suction port 103 and heat-exchanged by a heat exchanger (not shown) upward. ing. On the other hand, below the suction port 103 on the front surface of the housing 102, a lower outlet 105 is provided for blowing out the heat-exchanged air downward.

  As shown in FIG. 16, a backward fan 106 that blows air in the entire circumferential direction is disposed in the casing 102 in order to send the heat-exchanged air toward the upper outlet 104 or the lower outlet 105. Has been. Further, in the housing 102, the upper air guider 107 is inclined at a predetermined angle with respect to the center line of the backward fan 106 in order to guide the heat-exchanged air to the upper outlet 104 or the lower outlet 105. The lower air guider 108 is disposed at a position (diagonal position) opposite to the upper air guider 107 across the center of the backward fan 106.

In this air conditioner 101, the backward fan 106 rotates, whereby indoor air is taken into the housing 102 from the suction port 103 and passes through a heat exchanger (not shown). The air heat-exchanged by the heat exchanger becomes a flow in the entire circumferential direction having a velocity component in the circumferential direction by the backward fan 106. The air flow becomes an upward and downward flow by the upper air guider 107, and an upward and downward flow by the lower air guider 108 and is guided to the upper outlet 104 and the lower outlet 105, respectively. In this way, the heat-exchanged air is sent out from the upper outlet 104 and the lower outlet 105 into the room.
JP 2001-208366 A

  However, the conventional air conditioner has the following problems. In general, various types of heating appliances such as warm air heaters and infrared heaters including air conditioners are widely used as heating appliances. On the other hand, as an air conditioner, there is no suitable air conditioner having a function of cooling and dehumidifying other than the air conditioner.

  Therefore, in an air conditioner having a cooling / heating function, the frequency is more frequently used as a cooling device than as a heating device. Normally, when a floor-standing type air conditioner is in a cooling operation, air that has been heat-exchanged and cooled is sent out indoors from the upper outlet. On the other hand, when the heating operation is performed, the heat-exchanged air is sent into the room mainly from the lower outlet or both the lower outlet and the upper outlet.

  As shown in FIG. 16, in the floor-standing air conditioner 101 described above, the air that extends toward the upper outlet 104 extends from the tongue 110 of the lower air guider 108 toward one end of the upper outlet 104. The air flows in the air passage 113 formed between the portion 111a and the wall portion 111b extending from the tongue 109 of the upper air guider 107 toward the other end of the upper outlet 104 (upper outlet). On the other hand, the air flowing toward the lower air outlet 105 passes through the wall 112b extending from the tongue 109 of the upper air guider 107 toward one end of the lower air outlet 105, and from the tongue 110 of the lower air guider 108 to the lower air outlet 105. It flows in the air passage 114 formed between the wall portion 112a extending toward the other end side (lower blowing).

  The two tongues 109 and 110 are positioned so as to be opposed to each other at a position inclined by a predetermined angle (θ1, θ2) with respect to a normal passing through the center 106a of the backward fan 106 with the center 106a interposed therebetween. For this reason, the length (distance) of each wall part 111a, 111b, 112a, 112b will be restrict | limited by the relationship with the limited height of the housing | casing 102. FIG. As a result, there has been a problem that a sufficient amount of blown air cannot be obtained particularly when air is to be blown into the room only from the upper blow-off port 104 during the frequently used cooling operation (upward blow).

  The present invention has been made to solve the above problems, and an object of the present invention is to provide an air conditioner that can perform the lower blowing during the heating operation while securing the air volume of the upper blowing during the cooling operation. It is.

The air conditioner according to the present invention includes a predetermined casing, an upper outlet, a lower outlet, a centrifugal fan, a fan casing, an upper outlet duct, a notch hole, a lower outlet duct, a connection portion, and a tongue portion. . The upper outlet is provided at the upper part of the casing, and blows out air that has been taken into the casing and subjected to heat exchange out of the casing. The lower outlet is provided in the lower part of the casing, and blows out the heat-exchanged air out of the casing. The centrifugal fan is disposed between the upper outlet and the lower outlet in the casing, and sends out heat-exchanged air toward the upper outlet and the lower outlet. The fan casing surrounds the centrifugal fan from the circumferential direction, and has a peripheral wall portion formed with an inner peripheral surface through which heat-exchanged air flows, and is disposed so as to cover the centrifugal fan. The upper outlet duct is provided above the fan casing, and communicates the inside of the fan casing with the upper outlet. Notched hole, out of the peripheral wall portion of the fan casing, that is formed in a predetermined circumferential wall portion of the lower side blowing duct tangentially Direction of air flow formed along the inner circumferential surface is connected. Connection for communicating with the upper side blowing duct is formed in an upper portion of the fan casing. The tongue is disposed on one side of the connecting portion in the direction orthogonal to the rotation axis of the centrifugal fan. The lower outlet duct is provided below the fan casing, and communicates the inside of the fan casing and the lower outlet through a notch hole. Centrifugal fans rotate in only one direction. The inner peripheral surface of the peripheral wall portion is formed in a region extending from the tongue portion to the other side facing the one side of the connecting portion through the portion where the notch hole is located based on the involute curve. The flow of air from the tongue portion through the portion where the notch hole is located to the other side of the connecting portion and the air flow toward the lower outlet through the notch hole are generated.

According to this configuration, first, the fan casing has the peripheral wall portion in which the inner peripheral surface that surrounds the centrifugal fan from the circumferential direction and flows along the heat-exchanged air is formed. As a result, during cooling operation that is frequently used, the air flow length can be sufficiently secured by flowing the air that has been heat-exchanged and cooled along the inner peripheral surface of the peripheral wall portion. A sufficient amount of air can be obtained from the mouth. Furthermore, notch hole is formed at a predetermined peripheral wall portion of the lower side blowing duct tangentially Direction of air flow are connected, the lower blowing duct is provided to communicate the cutout hole and the lower air outlet thereof ing. As a result, during heating operation, the pressure of the air sent out from the lower outlet through the notch hole is suppressed, while the air flowing out from the upper outlet through the inner peripheral surface without passing through the notch hole is suppressed. Air volume can be secured.

  More specifically, in order to reduce the pressure loss of the air sent out from the lower outlet, the notch hole is formed to have the same cross-sectional area as the opening sectional area of the lower outlet, and the lower outlet duct is opened. It is preferable that the cross-sectional area is the same as the cross-sectional area. Moreover, it is preferable that the lower blowing duct is disposed so as to follow the flow of air passing through the notch hole toward the lower blowing port. The same cross-sectional area is not intended to be completely the same cross-sectional area mathematically, but includes a numerical range that does not affect the pressure loss of air.

  Furthermore, it is preferable that the notch hole is formed at a position closer to one side where the tongue portion is located than the other side of the connection portion.

In order to obtain a sufficient amount of air blown from the upper outlet during cooling operation and to send air from the lower outlet during heating operation, a damper is provided for adjusting the amount of air flowing through the lower outlet duct. It is preferable.
In addition, in order to secure the air volume of the air sent from the upper outlet while suppressing the pressure loss of the air sent from the lower outlet through the notch, the notch is formed on the inner wall of the fan casing. It is preferable to form in the part of the predetermined | prescribed surrounding wall part in which a lower blowing outlet is located ahead of the tangential direction of the flow of the air produced along a surrounding surface.

  A floor-standing air conditioner according to an embodiment of the present invention will be described. As shown in FIGS. 1 and 2, first, a suction port 3 for taking indoor air into the housing 2 is provided on the back surface of the housing 2 of the air conditioner 1. In the upper part of the front surface of the housing 2, there is provided an upper outlet 4 for blowing upward the air taken in from the inlet 3 and heat-exchanged by a heat exchanger (not shown). . On the other hand, a lower outlet 6 is provided at the lower part of the front surface of the housing 2 to blow out the heat-exchanged air downward. In addition, side air outlets 5a and 5b for blowing heat-exchanged air left and right are also provided on one side surface and the other side surface of the housing 2.

  Next, the inside of the housing 2 will be described. As shown in FIG. 3, a centrifugal fan 9 is provided in the housing 2 for taking indoor air from the suction port 3 into the housing 2 and blowing it out from the upper blowout port 4 and the like. The centrifugal fan 9 includes a motor 9 a and a plurality of blades 9 b, and is disposed in the vicinity of the center on the front side of the housing 2 facing the suction port 3. Between the suction port 3 and the centrifugal fan 9, an air filter 7 for removing dust and dirt contained in the air and a heat exchanger 8 for performing heat exchange are disposed. An outdoor unit (not shown) is connected to the heat exchanger 8 to circulate the refrigerant.

  As shown in FIGS. 3 and 4, a fan casing 10 is attached to the centrifugal fan 9 so as to cover from the front side of the housing 2. Above the fan casing 10, there is disposed an upper blowing duct 16 that communicates the inside of the fan casing 10 with the upper blowing opening 4 or the side blowing ducts 5 a and 5 b. The upper outlet duct 16 is formed by a duct front part 16a and a duct rear part 16b.

  On the other hand, below the fan casing 10, a lower outlet duct 15 is provided that communicates the inside of the fan casing 10 with the lower outlet 6. As will be described later, the fan casing 10 is provided with a notch 12 communicating with the lower outlet duct 15 at a predetermined portion based on the positional relationship between the fan casing 10 and the lower outlet 6. A damper 17 for adjusting the amount of air flowing through the lower blowing duct 15 is disposed in the middle of the lower blowing duct 15.

  Next, the structure of the fan casing 10 will be described. As shown in FIGS. 5 and 6, the fan casing 10 includes a peripheral wall portion 11 that surrounds the blade 9 b (see FIG. 4) of the centrifugal fan 9 from the circumferential direction. An inner peripheral surface 11 a through which heat-exchanged air flows is formed inside the peripheral wall portion 11. At a predetermined position of the peripheral wall portion 11, a notch hole 12 communicating with the lower blowout duct 15 (see FIG. 4) is formed.

  Further, an opening-shaped connecting portion 14 connected to the upper blowing duct 16 and communicating with the upper blowing duct 16 is formed on the upper portion of the fan casing 10. A portion of the fan casing 10 on one side 14a in the direction orthogonal to the rotation axis 9c of the centrifugal fan 9 in the connecting portion 14 is directed to the blade 9b (see FIG. 4) at a predetermined distance from the blade 9b. A tongue 13 is formed so as to protrude.

  On the other side 14b facing the one side 14a of the connecting portion 14, the peripheral wall portion 11 and the upper outlet duct 16 (see FIG. 4) are smoothly connected. The inner peripheral surface 11a is formed based on an involute curve from the tongue 13 to the other side 14b of the connecting portion 14 through a portion where the notch 12 is formed. Note that a motor 9 a (see FIG. 4) of the centrifugal fan 9 is attached to a rectangular opening provided in the central portion of the fan casing 10. In the fan casing 10, a general air flow is formed from the tongue 13 through the notch 12 toward the other side 14b.

  Next, the position of the cutout hole 12 formed in the peripheral wall portion 11 will be described. As described above, in the fan casing 10, the air flows along the inner peripheral surface 11 a from the tongue portion 13 through the notch hole 12 toward the other side 14 b. As shown in FIG. 7, the notch 12 is formed in the peripheral wall portion 11 where the lower outlet 6 is located at the tip of the tangential direction (arrow 50 a) of the air flow (arrow 50). Is formed. In this case, the notch 12 is formed at a position closer to the one side 14 a where the tongue portion 13 is located than the other side 14 b of the connecting portion 14. The lower outlet duct 15 communicates with the notch hole 12 and is connected to the lower outlet 6 so as to substantially follow the air flow (arrow 52) passing through the notch hole 12. For this reason, the lower blowing duct 15 is disposed so as to be inclined with respect to the vertical direction (see FIG. 4).

  If the notch hole is provided in a certain range along the circumferential direction, the portion of the peripheral wall portion 11 where the lower outlet 6 is located at the tip in the tangential direction of the flow passes through the notch hole and is linear. The part of the surrounding wall part 11 in which the lower blower outlet 6 is located ahead of the flow of the air which flows into. It is not necessarily intended that the lower outlet 6 is located at the tip in the tangential direction with respect to every position in the circumferential direction in the region of the inner peripheral surface 11a where the notch hole is formed.

  Further, the lower blowing duct 15 disposed so as to substantially follow the flow of air passing through the notch hole 12 means that the lower blowing duct 15 is disposed completely along the air flow passing through the notch hole 12. If the flow path of the air flowing through the notch hole 12 is not greatly changed and extends toward the lower outlet 6, it is slightly inclined from the direction of the flow. You may do it.

  In order to specify this arrangement relationship more specifically, as shown in FIG. 7, for example, XY coordinate axes orthogonal to each other with the rotation axis 9c of the centrifugal fan 9 as the origin O are set. If it does so, the notch hole 12 will be formed in the part of the surrounding wall part 11 located in a 4th quadrant. On the other hand, as shown in FIG. 8, if the notch hole 12 is formed in the portion of the peripheral wall portion 11 located in the third quadrant, the flow of air (arrow) that flows linearly through the notch hole 12. The lower outlet 6 is not located beyond 51), and the heat-exchanged air cannot be led to the lower outlet 6. The inventors have confirmed that when the cutout hole 12 is formed in the part of the peripheral wall portion 11 that is actually located in the third quadrant, air cannot be blown out from the lower blowout port 6.

  In order to eliminate pressure loss, the notch 12 is formed to have the same opening cross-sectional area (depth length × circumferential length) as the opening cross-sectional area of the lower outlet 6. Further, the lower air outlet duct 15 that communicates the notch hole 12 and the lower air outlet 6 is also provided with the same channel cross-sectional area as the opening cross-sectional area of the lower air outlet 6. Note that the same cross-sectional area is not intended to be exactly the same mathematically, and naturally includes manufacturing errors, etc., and also includes a numerical range that does not affect air pressure loss. It is a waste.

  Further, depending on the position in the fourth quadrant of the cutout hole 12 formed in the portion of the peripheral wall portion 11 located in the fourth quadrant, the lateral air blowing amount (wind speed) is biased at the lower outlet 6. There is a case. As shown in FIG. 4, in the lower blowing duct 15, an air guider 18 is provided in the middle of the lower blowing duct 15, so that the horizontal (left and right) air blowing amount at the lower blowing port 6 is made uniform. Yes.

  Next, operation | movement of the air conditioner 1 mentioned above is demonstrated. First, in the cooling operation, as shown in FIG. 9, the damper 17 provided in the lower outlet duct 15 is closed. Next, as shown in FIG. 10, when the centrifugal fan 9 rotates, indoor air (arrow 60) is taken into the housing 2 from the suction port 3, and dust or dirt contained in the air by the air filter 7. Is removed. The air from which dust and the like have been removed through the air filter 7 passes through the heat exchanger 8. While passing through the heat exchanger 8, heat is exchanged between the refrigerant circulating in the heat exchanger 8 and the air to cool the air.

  As shown in FIG. 11, the heat-exchanged air flows along the inner peripheral surface 11 a of the peripheral wall portion 11 of the fan casing 10 by the centrifugal fan 9, and in the fan casing 10, the tongue does not flow to the lower outlet duct 15. An air flow (arrow 61) is formed from the portion 13 to the other side 14b of the connecting portion 14 through the portion where the notch 12 is located. That is, based on the coordinate axes shown in FIG. 7, air flows from the first quadrant to the second quadrant through the fourth quadrant and the third quadrant.

  The air reaching the connecting portion 14 is guided from the connecting portion 14 to the upper outlet 4 or the side outlets 5a and 5b through the upper outlet duct 16. Thus, the air that has been heat-exchanged and cooled is sent into the room from the upper outlet 4 or the side outlets 5a and 5b, and the room is cooled.

  Next, in the heating operation, as shown in FIGS. 12 and 13, first, the damper 17 provided in the lower outlet duct 15 is opened. By rotating the centrifugal fan 9, indoor air is taken into the housing 2 from the suction port 3, and dust and dirt contained in the air are removed by the air filter 7. The air from which dust and the like have been removed through the air filter 7 passes through the heat exchanger 8. While passing through the heat exchanger 8, heat is exchanged between the refrigerant circulating in the heat exchanger 8 and the air to warm the air (see FIG. 10).

  The heat-exchanged air flows along the inner peripheral surface 11a of the peripheral wall portion 11 of the fan casing 10 by the centrifugal fan 9, and in the fan casing 10, the connection portion passes through the portion where the notch 12 is located from the tongue portion 13. A global flow of air (arrow 62) towards the other side 14b of 14 is formed. At this time, because the damper 17 is open, a part of the air flowing along the inner peripheral surface 11 a (arrow 63) passes from the tongue portion 13 through the notch 12 to the lower blowing duct 15. Flowing. Air flowing through the lower outlet duct 15 is sent out from the lower outlet 6 into the room.

  On the other hand, the remaining air flowing in the fan casing 10 is guided from the connecting portion 14 to the upper outlet 4 or the side outlets 5a and 5b through the upper outlet duct 16. Thus, the air heated by heat exchange is sent into the room from the upper outlet 4, the side outlets 5a and 5b, and the lower outlet 6 to heat the room. In the heating operation, air may be sent out only from the lower outlet 6. In this case, the flow to the upper outlet 4 is blocked by a predetermined damper (not shown).

  In the air conditioner 1 described above, in the fan casing 10 that covers the centrifugal fan 9, the tongue portion 13 is formed on one side 14 a of the connection portion 14 that communicates with the upper outlet duct 16, and the other side of the connection portion 14. In 14b, the surrounding wall part 11 and the upper blowing duct 16 are connected smoothly. Thus, in the fan casing 10, a general air flow is generated from the tongue portion 13 on one side 14 a of the connection portion 14 toward the other side 14 b of the connection portion 14 along the peripheral wall portion 11. From the conventional air conditioner, it is possible to ensure the air flow path length from the upper air outlet 4 to the upper air outlet 4. As a result, in the cooling operation that is frequently used, it is possible to obtain a sufficient blown air volume of the air cooled by heat exchange.

  Further, in the fan casing 10, a cutout hole 12 is formed in a portion of the peripheral wall portion 11 in which the lower outlet 6 is located in the tangential direction of the air flow formed along the inner peripheral surface 11 a of the peripheral wall portion 11. The lower blowout duct 15 is formed and communicates with the cutout hole 12 and is connected to the lower blowout opening 6 so as to substantially follow the air flow. And the opening cross-sectional area of the notch hole 12, the flow-path cross-sectional area of the lower blowing duct 15, and the opening cross-sectional area of the lower blowing outlet 6 are set so that it may become substantially the same area.

  As a result, the portion that obstructs the flow of air from the fan casing 10 through the notch 12 to the lower outlet 6 is reduced, and heat exchange from the lower outlet 6 with minimal pressure loss during heating operation. The blown air can be blown out. In this way, the air conditioner can ensure a sufficient amount of upward blown air during frequently used cooling operation, and lower air blow that suppresses pressure loss while performing upward blowing during heating operation. Can be performed.

  In the air conditioner 1 described above, the case where the damper 17 is provided in the middle of the lower blowing duct 15 is taken as an example. For example, as shown in FIG. 14, the air conditioner 1 slides along the peripheral wall portion 11 of the fan casing 10. You may apply the damper 19 of the aspect made (arrow 55).

  The embodiment disclosed this time is an example, and the present invention is not limited to this. The present invention is defined by the terms of the claims, rather than the scope described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a front view of the air conditioner concerning an embodiment of the invention. In the embodiment, it is a side view of an air conditioner. FIG. 3 is a cross-sectional view taken along a cross-sectional line III-III shown in FIG. 1 in the same embodiment. FIG. 4 is a cross-sectional view taken along a cross-sectional line IV-IV shown in FIG. 2 in the same embodiment. In the same embodiment, it is a perspective view which shows a fan casing. In the same embodiment, it is another perspective view which shows a fan casing. In the same embodiment, it is the 1st front view for demonstrating the attachment position of the notch hole in a fan casing. In the same embodiment, it is the 2nd front view for demonstrating the attachment position of the notch hole in a fan casing. In the embodiment, it is a fragmentary sectional view which shows the damper for demonstrating the air_conditioning | cooling driving | operation operation | movement of an air conditioner. FIG. 3 is a first cross-sectional view for explaining a cooling operation operation of the air conditioner in the same embodiment. In the same embodiment, it is the 2nd sectional view for explaining cooling operation operation of an air harmony machine. In the embodiment, it is sectional drawing for demonstrating heating operation operation | movement of an air conditioner. In the embodiment, it is a fragmentary sectional view which shows the damper for demonstrating the heating operation operation | movement of an air conditioner. In the embodiment, it is a perspective view which shows the modification of the damper attached to a fan casing. It is a perspective view of the conventional air conditioner. FIG. 16 is a cross sectional view taken along a cross sectional line XVI-XVI shown in FIG. 15.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Air conditioner, 2 housing | casing, 3 suction inlet, 4 upper outlet, 5a, 5b side outlet, 6 lower outlet, 7 air filter, 8 heat exchanger, 9 centrifugal fan, 9a motor, 9b blade, 9c Rotating shaft, 10 Fan casing, 11 Peripheral wall part, 11a Inner peripheral surface, 12 Notch hole, 13 Tongue part, 14 Connection part, 14a One side, 14b The other side, 15 Lower outlet duct, 16 Upper outlet duct, 17, 19 Damper, 18 Air guider.

Claims (6)

A predetermined housing;
An upper outlet for blowing out air that is provided in the upper part of the casing and is heat-exchanged by being taken into the casing;
A lower air outlet provided at the lower part of the housing, for blowing out the heat-exchanged air to the outside of the housing;
A centrifugal fan that is disposed between the upper outlet and the lower outlet in the casing, and sends out heat-exchanged air toward the upper outlet and the lower outlet.
A fan casing that surrounds the centrifugal fan from the circumferential direction and has a peripheral wall portion formed with an inner peripheral surface along which heat-exchanged air flows, and is disposed so as to cover the centrifugal fan;
An upper outlet duct provided above the fan casing and communicating the inside of the fan casing and the upper outlet;
Wherein one of the peripheral wall portion of the fan casing, given the peripheral wall cut-out hole formed in a portion of the lower side blowing duct is connected in the tangential Direction of air flow is formed along the inner peripheral surface When,
A connection part formed on the upper part of the fan casing for communicating with the upper outlet duct;
A tongue portion disposed on one side of the connection portion in a direction orthogonal to the rotation axis of the centrifugal fan;
The lower outlet duct is provided below the fan casing, and communicates the inside of the fan casing and the lower outlet through the notch hole,
The centrifugal fan rotates only in one direction,
The inner peripheral surface of the peripheral wall portion is formed in a region extending from the tongue portion to the other side facing the one side of the connecting portion through a portion where the notched hole is located based on an involute curve. Then, in the fan casing, the air flows from the tongue portion to the other side of the connecting portion through the portion where the notched hole is located, and toward the lower outlet through the notched hole. An air conditioner that generates air flow . The notch hole is formed to have the same cross-sectional area as the opening cross-sectional area of the lower outlet,
The air conditioner according to claim 1, wherein the lower outlet duct is formed to have the same flow path cross-sectional area as the opening cross-sectional area.   The air conditioner according to claim 1 or 2, wherein the lower blowing duct is disposed so as to follow a flow of air passing through the cutout hole toward the lower blowing port.   The air conditioner according to any one of claims 1 to 3, wherein the cutout hole is formed at a position closer to the one side where the tongue portion is located than the other side of the connection portion.   The air conditioner in any one of Claims 1-4 provided with the damper for adjusting the quantity of the air which flows through the said lower blowing duct. The notch hole is formed in a portion of the peripheral wall portion where the lower outlet is located in a tangential direction of the air flow generated along the inner peripheral surface of the peripheral wall portion of the fan casing. The air conditioner according to any one of claims 1 to 5.

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