Cross flow blower

Abstract: The constitution is characterized by installing a cross flow fan (18) having impellers composed of plural blades (19) arranged in a columnar form, inside a casing forming a draft path inside comprising suction ports and a blowing port(12); disposing a stabilizer (21) forming and a rear quide (23) which forms a diffuser from the cross flow fan (18) and the blowing port(12); and forming a vertical guide blade (25) for controlling the stream of air flow in the vertical direction at the blowing port (12), wherein the vertical guide blade (25) is disposed so that 1/2 or more of the chord length may be present outside of the diffuser in the normal operation state.

Description: The present invention relates to a cross flow blower used in an air-conditioner or the like, and more particularly to a wind direction control technology of blowing unit. JP-A-59 183235 shows an air blowing unit comprising lateral guide fins. The guide fins are linked by connecting bar 12. The connecting bar has a rectangular sectional form. As a cross flow blower used in a conventional air-conditioner, one as shown in Fig. 5 is known. In Fig. 5, the cross flow blower has suction ports 201 in upper side and ceiling part, and a blowing port 202 in lower side, and a draft path 203 is formed between the suction ports 201 and the blowing port 202. Inside the draft path 203, a detachable air filter 206 to be inserted to the ceiling side position of a main body base frame 205, heat exchangers 207 disposed at front side and back side, and a cross flow fan 208 located inside enclosed by the heat exchangers 207 are disposed along the inner side of a front cover 204. The cross flow fan 208 is composed by arranging plural blades 209 in a columnar form to form an impeller, and assembling a plurality of impellers in the direction or axis of rotation. In the draft path 203 at the downstream side of the cross flow fan 208, a stabilizer 211 located closely and oppositely to the cross flow fan 208, and a rear guide 213 forming a diffuser 212 extending from the cross flow fan 208 to the blowing port 202 between it and the stabilizer 211 are arranged. Part of the rear guide 213 and the stabilizer 211 forms a drain pan 214 for receiving dehumidified water dropping from the heat exchangers 207. The blowing port 202 comprises a vertical guide blade 215 for controlling the direction of air flow blowing out into the room in the vertical direction, and a lateral guide blade 216 for controlling in the lateral direction. The vertical guide blade 215 is positioned inside of the diffuser 212 in most part, during a normal operation. When the operation is stopped, the vertical guide blade 215 forms the contour of the blower and is hence formed in a plate shape along the contour line. A coupling beam 217 for moving the lateral guide blade 216 by interlock is disposed orthogonally to a rotary shaft 218 of the lateral guide blade 216. In the cross flow blower having such constitution, the air flow blown out from the cross flow fan 208 passes through the vertical guide blade 215 and is separated, and collides at the leading end of the vertical guide blade 215. This has been was the cause of increase of noise. Moreover, at the upper side and lower side of the vertical guide blade 215, front edge peeling occurs and the flow rate performance is decreased significantly. The same also occurs in the coupling beam 217 for moving the lateral guide blade 216 by interlock. The coupling beam 217 is also a severe resistance to flow, Such a cross flow blower is also known from JP-A-07 158952.The blowing unit of this blower comprises vertical and lateral guide blades for altering the direction of the air flow. Lateral guide blades are linked by a coupling unit provided near the upper frame of the air outlet. It is an object of the present invention to provide an improved cross flow blower. This object is achieved by the features of claim 1. A further embodiment is subject matter of dependent claim 2. In this constitution, the draft resistance given by the coupling beam to the air flow is minimum, and no increase of noise caused by collision of air flow against the leading end of the front edge of the coupling beam occurs, and occurrence of large peeling at the upper side and lower side of the coupling beam is prevented, and the flow rate performance is enhanced. In a preferred constitution, the coupling beam is formed in an elliptical or oblong form in a sectional shape. In this constitution, the noise caused by collision of air flow against the leading end of the coupling beam is further suppressed, and peeling at the upper side and lower side of the coupling beam is further suppressed, the draft resistance is decreased, and the flow rate performance is enhanced. Fig. 1 is a cross sectional view of a first example useful for the understanding of the present invention; Fig. 2 is a cross sectional view of a second example useful for the understanding of the present invention; Fig. 3 is a cross sectional view of a first embodiment of the present invention; Fig. 4 (a) is a cross sectional view of a second embodiment of the present invention; Fig. 4 (b) is a magnified view of a coupling beam 11 in the seventh embodiment of the present invention; Fig. 5 is a cross sectional view of a prior art. Referring now to the drawings, embodiments of the invention are described below. Fig.1 is a cross sectional view of a first example useful for the understanding of the present invention. In Fig. 1, a cross flow blower 10 has suction ports 11 at upper side and ceiling, and has a blowing port 15 at lower side, and a draft path 13 is formed between the suction ports 11 and blowing port 12. Inside the draft path 13, a detachable air filter 16 to be inserted to the ceiling side position of a main body base frame 15, heat exchangers 17 disposed at front side and back side, and a cross flow fan 18 located inside enclosed by the heat exchangers 17 are disposed along the inner side of a front cover 14. The cross flow fan 18 is composed by, assembling, in the direction of the axis of rotaion, a plurality of impellers, each of which is formed by arranging plural blades 19 in a columnar form. In the draft path 13 at the downstream side of the cross flow fan 18, a stabilizer 21 located closely and oppositely to the cross flow fan 18, and a rear guide 23 forming a diffuser 22 extending from the cross flow fan 18 to the blowing port 12 between it and the stabilizer 21 are arranged. Part of the rear guide 23 and stabilizer 21 forms a drain pan 24 for receiving dehumidified water dropping from the heat exchangers 17. The blowing port 12 comprises a vertical guide blade 25 for controlling the direction of air flow blowing out into the room in the vertical direction, and a lateral guide blade 26 for controlling in the lateral direction. The vertical guide blade 25 is positioned outside of the diffuser 22 in most part during normal operation. A coupling beam 27 which moves the lateral guide blade 26, is fitted to a coupling pin 28 for interlinking the lateral guide blade 26. The state of the vertical guide blade 25 during operation is indicated by solid line, and that in stopped state by twin dot chain line. In operation, the vertical guide blade 25 is disposed outside of the diffuser 22 by 1/2 or more of the chord length. That is, the front edge of the vertical guide blade 25 is present at a position in a distance of 1/2 or less of the chord length L from the opening end of the blowing port 12. Incidentally, M1 indicates the middle point of the chord length L of the vertical guide blade 25. In this constitution, the air flow passes through the suction ports 11, air filter 16, and heat exchangers 17, and flows into the cross flow fan 18, and further passes through the diffuser 22 formed between the rear guide 23 and stabilizer 21, and is controlled of the blowing direction by the vertical guide blade 25 and lateral guide blade 26, and is released into the room through the blowing port 12. Meanwhile, the air flow running in the diffuser 22 is slowest at the blowing port 12. On the other hand, since 1/2 or more of the chord length of the vertical guide blade 25 is present outside the diffuser 22, its front edge 25a is present near the blowing port 12, that is, at a position in a distance of 1/2 or less of the chord length. Therefore, the air flow blowing out of the cross flow fan 18 collides against the front edge of the vertical guide blade 25 in a state of considerably lowered flow velocity. As a result, no increase of noise is induced, and large peeling does not occur at the upper side and lower side of the vertical guide blade 25, and therefore a smooth flow field is formed and the flow rate performance is enhanced. Moreover, since 1/2 or more of the vertical guide blade 25 is present outside the diffuser 22, the control of running direction of air flow is more accurate. Fig. 2 is a cross sectional view of a second example useful for the understanding of the present invention. Members acting same as in the first example are identified with same reference numerals and explanation is omitted. In Fig. 2, upper guide blades 31, 32 are disposed in the blowing port 12 in upper position and lower position, and the both vertical guide blades 31, 32 are disposed so that 1/2 or more of the chord length may be present outside of the diffuser 22 during normal operation. Incidentally, M2 denotes the middle point of the chord length L of the upper vertical guide blade 31, and M3 is the middle point of the chord length L of the lower vertical guide blade 32. In this constitution, since the both vertical guide blades 31, 32 are present outside of the diffuser by 1/2 or more of the chord length, their front edges 31a, 32a are positioned near the blowing port 12, that is, at a position in a distance of 1/2 or less of the chord length. Therefore, the air flow blowing out of the cross flow fan 18 collides against the front edges 31a, 32a of the vertical guide blades 31a, 32a in a state of considerably lowered flow velocity. As a result, no increase of noise is induced, and large peeling does not occur at the upper side and lower side of the vertical guide blades 31, 32, and therefore a smooth flow field is formed and the flow rate performance is enhanced. Meanwhile, the narrow passage formed between the lower vertical guide blade 32 and rear guide 23 is large in draft resistance, but since 1/2 or more of the chord length of the vertical guide blade 32 is present outside of the diffuser, the distance of narrow passage is short, and the flow rate performance does not deteriorate. Fig. 3 is a cross sectional view of a first embodiment of the present invention. Members acting same as in the second first are identified with same reference numerals and explanation is omitted. In Fig. 3, vertical guide blades 71, 72 are shown in normal operation state, and the both vertical guide blades 71, 72 are disposed so that 1/2 or more of the chord length may be present outside of the diffuser 22 during normal operation. A coupling beam 73 is disposed along the stream of the air flow in the diffuser 22. In the case the coupling beam 73 is located between the lower vertical guide blade 72 and rear guide 23 in the height direction of the diffuser 22, when the slope angle α of the lower vertical guide blade 72, the slope angle β in the blowing port 12 of the rear guide 23, and the slope angle γ of the coupling beam 73 satisfy the following relation, the coupling beam 73 is in a position along the stream of the air flow. α ≦ γ ≦ β In this constitution, as the draft resistance given by the coupling beam 73 to the air flow is minimum, noise is not increased extremely when the air flow collides against the leading end of the front edge of the coupling beam 73, and large peeling at the upper side and lower side of the coupling beam 73 is prevented, so that the flow rate performance may be enhanced. Fig. 4 (a) and Fig. 4 (b) are cross sectional views of a second embodiment of the present invention. Members acting same as in the first embodiment are identified with same reference numerals and explanation is omitted. In Fig. 7, a coupling beam 81 for moving the lateral guide blade 26 by interlinking is formed in an elliptical or oblong shape in a sectional shape. In this constitution, the noise caused by the air colliding against the leading end of the front edge of the coupling beam 81 can be further suppressed, and peeling at the upper side and lower side of the coupling beam 81 can be further suppressed, and therefore the draft resistance is smaller and the flow rate performance is further enhanced.

Claims: A cross flow blower, comprising: a cross flow fan (18) located inside a casing having suction ports (11) and a blowing port (12) and forming therein a draft path (13), and having impellers composed of plural blades (19) arranged in a columnar form; a stabilizer (21) and a rear guide (23) located between the cross flow fan (18) and the blowing port (12), and forming a diffuser (22); and vertical guide blades (71, 72) for controlling the stream of air flow in the vertical direction, lateral guide blades (26) for controlling the stream of air flow in the lateral direction, and a coupling beam (73) which interlinks and moves the lateral guide blades, the vertical guide blades and lateral guide blades being located at the blowing port (12), characterized in that said coupling beam (73) being located at a height between said lower vertical guide blade (72) and the rear guide (23) at the blowing port (12), and said coupling beam (73) being arranged and said lower vertical guide blade (72) being adjustable such that a slope angle α of the lower vertical guide blade (72), a slope angle β of the rear guide (23) at the blowing port (12), and a slope angle γ of the coupling beam (73) satisfy a relationship of α ≦ γ ≦ β. The cross flow blower according to claim 1, wherein the coupling beam (81) is formed to be elliptical in a sectional shape.

Inventors: HIGASHI CHIAKI, SAKAI HIROKAZU, SUGIO TAKASHI, HIGASHI, CHIAKI, SAKAI, HIROKAZU, SUGIO, TAKASHI
Applicants: MATSUSHITA ELECTRIC IND CO LTD, MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
Application year: 1996
Main classification: F24F13
IPC codes: F24F1