JP6455225B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner, and more particularly to a structure of a sirocco fan.

  As a blower provided in an indoor unit of an air conditioner, a sirocco fan in which an impeller is housed in a spiral casing is known. An air flow path is provided inside the casing, and a suction port provided on the side surface of the casing communicates with a substantially rectangular air outlet provided at the front end of the casing.

  In the sirocco fan described above, various means have been proposed for changing the amount of air blown from the outlet (air flow rate) and the direction of air flow. For example, in the sirocco fan described in Patent Document 1, a rectifying plate for adjusting the air flow rate is provided at the air outlet, and the rectifying plate can slide in the vertical direction of the air outlet.

  Specifically, a pin is provided on the side surface of the rectifying plate, and a long hole through which the pin can be inserted is provided on the left and right side surfaces of the air outlet. By inserting the pin of the current plate into the long hole and sliding the pin to the upper limit along the long hole, the current plate slides in the vertical direction of the outlet.

  By changing the opening area of the outlet by sliding the rectifying plate up and down, the air flow rate can be easily adjusted. Therefore, it is not necessary to separately provide a control device for controlling the rotational speed of the motor for rotating the impeller of the sirocco fan, an expensive device such as a discharge damper, and a scroll damper.

JP-A-4-36518

  When it is not necessary to change the air flow rate or the air flow direction after installing the indoor unit, unlike the sirocco fan described in Patent Document 1, it is not necessary to move the rectifying plate provided at the outlet. In this case, if the current plate is formed integrally with the air outlet when the casing is formed, the cost of the sirocco fan can be reduced as compared with the case where the current plate is separately provided at the air outlet. However, when the casing is formed by injection molding, it is necessary to provide a draft at each location of the casing in order to remove the casing from the molding die after the casing is molded. Since it is necessary to provide this draft, restrictions are imposed on the shape of the current plate formed integrally with the air outlet. For example, in order to spread the air blown from the air outlet in the left-right direction, it is necessary to form the current plate so as to gradually spread from the inside of the casing toward the air outlet, and the current plate becomes an undercut part, There was a problem that the casing could not be removed from the mold after the casing was molded.

  An object of the present invention is to solve the above-described problems and to provide an air conditioner capable of freely forming the shape of a rectifying plate provided at the outlet of a sirocco fan.

The present invention solves the above-described problems, and an air conditioner according to the present invention includes an impeller that blows out air sucked in from the direction of the rotation axis in a radial direction, and a sirocco fan that includes a casing that houses the impeller. The casing includes a blowout portion surrounded by an upper surface portion, a lower surface portion, and left and right side portions, and an opening end of the blowout portion serves as a blowout port. The casing includes a first casing and a second casing, the first casing has an upper surface portion and left and right side portions, the second casing has a lower surface portion, and the first casing is provided with a first current plate. In addition, a second rectifying plate is provided in the second casing, the left and right side surfaces of the first casing are gradually expanded toward the outlet, and the first rectifying plate and the second rectifying plate are respectively It has a curvature and the curvature of at least one of the said 1st rectifying plate or the said 2nd rectifying plate has the same curvature as the said side part on either side, It is characterized by the above-mentioned.

  Since the air conditioner of this invention provides a rectifying plate in each of a 1st casing and a 2nd casing, when providing a rectifying plate in the blower outlet of a sirocco fan, the shape of a rectifying plate can be formed freely.

It is explanatory drawing of the indoor unit of the air conditioner in embodiment of this invention, (A) is an external appearance perspective view, (B) is an external appearance perspective view of the state which removed the top plate. It is explanatory drawing of the sirocco fan in embodiment of this invention, (A) is an external appearance perspective view of a sirocco fan, (B) is XX sectional drawing in (A). It is a disassembled perspective view of a sirocco fan. (A) is an arrow view C in FIG. 3, and (B) is an arrow view D in FIG. It is explanatory drawing of the flow of the air inside an indoor unit. It is an installation state figure of an indoor unit in an embodiment of the present invention.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The present invention is not limited to the following embodiments, and can be variously modified without departing from the gist of the present invention.

  The air conditioner which is one embodiment of the present invention is a duct type air conditioner, and the indoor unit 1 is installed in a space between the building ceiling surface 110 and the indoor ceiling surface 140 as shown in FIG. Specifically, the mounting bracket 130 attached to the ceiling plate 11 (described later) of the indoor unit 1 is fixed to the other end of the suspension bolt 120 whose one end is fixed to the building ceiling surface 110 and is suspended and installed. The indoor unit 1 is connected to an outdoor unit (not shown) arranged outdoors by a refrigerant pipe, and the refrigerant is circulated between the outdoor unit and the indoor unit 1 so that air conditioning of the air conditioning room in which the indoor unit 1 is installed is performed. Do.

  As shown in FIG. 1 (A), the indoor unit 1 has a horizontally long rectangular parallelepiped shape with a top plate 11, a bottom plate 12, a front plate 13, a back plate 14, a right plate 15, and a left plate 16 each formed of a steel plate. The housing 10 is formed. In the following description, the direction in which the front plate 13 is disposed in the housing 10 is the front, the direction in which the back plate 14 is disposed is the rear, the direction in which the top plate 11 is disposed is the upper, and the bottom plate 12 is the bottom plate 12. The direction in which the right side plate 15 is disposed is the right side, the direction in which the left side plate 16 is disposed is the left side, and the components constituting the indoor unit 1 are described in the same direction. To do.

  As shown in FIG. 1B, inside the housing 10 is a heat exchanger 30 for exchanging heat between the refrigerant discharged from a compressor (not shown) of the outdoor unit and the air in the air conditioning room in which the indoor unit 1 is installed. And the two sirocco fans 20 which blow the air of an air-conditioning room in the heat exchanger 30 are accommodated.

  The back plate 14 of the housing 10 is provided with a housing suction port 14 a for taking air into the housing 10. The front plate 13 of the housing 10 is provided with a housing air outlet 13 a for blowing out air from the inside of the housing 10. As shown in FIG. 6, the housing suction port 14 a is connected to a suction grill 170 provided on the indoor ceiling surface 140 via a suction duct 160. The housing outlet 13a is connected to an outlet grill 200 provided on the indoor ceiling surface 140 through an outlet duct 190.

  As shown in FIG. 1B, the housing 10 has a housing suction port 14a (upstream in the air flow inside the housing 10) to a housing air outlet 13a (also downstream). Two sirocco fans 20 and a heat exchanger 30 are arranged in this order in the direction in which they head. A partition plate 17 fixed to the top plate 11 and the bottom plate 12 is provided between the two sirocco fans 20 and the heat exchanger 30, and the sirocco fan 20 is accommodated inside the housing 10 by the partition plate 17. The fan chamber 80 is divided into a heat exchanger chamber 90 that houses the heat exchanger 30.

The heat exchanger 30 is connected by combining two flat plate-like heat exchanging portions in the left-right direction substantially equal to the lateral width of the housing outlet 13a in a square shape in a side view. Thereby, compared with the case where a flat heat exchanger is installed vertically or obliquely, the height dimension and depth dimension of the heat exchanger 30 are suppressed, and the air conditioning capability required by the indoor unit 1 is exhibited. The necessary heat exchanger area is secured.
A drain pan 70 is disposed below the heat exchanger 30 in the heat exchanger chamber 90 and receives condensed water formed of styrene foam and generated in the heat exchanger 30.

  As shown in FIGS. 2 and 3, the sirocco fan 20 is connected to a cylindrical impeller 23 having a large number of blades, a spiral casing 20 f that houses the impeller 23, and the center of the impeller 23. A motor 50 having a motor shaft 55 is provided. As shown in FIG. 5, the motor 50 is attached to a motor bracket 60 fixed to the partition plate 17 and is disposed between the two sirocco fans 20. The motor 50 rotates a motor shaft 55 that protrudes left and right from both sides of the motor 50. Thus, the impellers 23 of the two sirocco fans 20 are rotated. The two sirocco fans have the same configuration.

  As shown in FIGS. 2 to 4, the casing 20 f includes a first casing 21 that constitutes the upper part of the casing 20 f and a second casing 22 that constitutes the lower part of the casing 20 f. The first casing 21 is formed by a case upper surface 21c and a case side surface 21b. The upper surface 21c of the case is formed in a flat shape and is disposed in the front, and an upper arc 21cb that is formed in an arc shape that is continuous from the upper surface 21ca to the rear and is substantially a quarter of the circumference. Consists of. The case side surface 21b covers the left and right side ends of the case upper surface 21c, and a front side surface portion 21ba is formed in front of a tongue piece portion 22g of the second casing 22 which will be described later, and the case side surface 21b opens downward with the rotation shaft of the impeller 23 as a center. A semicircular first cutout 21f is provided. The shape of the front side surface portion 21ba will be described in detail later.

  The second casing 22 is formed by a case lower surface 22b and a case side surface 22f. The case lower surface 22b includes a tongue piece portion 22g at a position closest to the front end of the impeller 23, and a lower surface portion 22ba that is inclined downward from the tongue piece portion 22g toward the front and formed into a flat shape, and a tongue piece portion. It consists of lower circular arc part 22bb formed in the semicircular arc shape behind 22g. The case side surface 22f includes left and right ends of the lower arc portion 22bb and includes a semicircular second cutout portion 22e that opens upward with the rotation axis of the impeller 23 as a center.

  When the casing 20f is assembled by combining the first casing 21 and the second casing 22, the first cutout portion 21f of the first casing 21 and the second cutout portion 22e of the second casing 22 are circularly formed on the left and right side surfaces of the casing 20f. The suction port 20a is formed. Further, in front of the casing 20f, a portion in front of the tongue piece 22g of the second casing 22 in the upper surface portion 21ca of the first casing 21 (a portion in front of the broken line in FIGS. 2A and 4A). ) And the front upper surface portion 21caa and the left and right front side surface portions 21ba and the lower surface portion 22ba of the second casing 22 are formed, and the front opening end of the blowout portion 20b is the air outlet 20ba. Further, a flange 21g for fixing the sirocco fan 20 to the partition plate 17 is provided around the blowout portion 20b.

  And the space which connects the suction inlet 20a and the blower outlet 20ba becomes the air flow path 20e shown to FIG. 2 (B). The air flow path 20e is formed such that the distance between the impeller 23, the case lower surface 22b, and the case upper surface 21c gradually increases from the tongue piece 22g toward the air outlet 20ba.

  When the impeller 23 is rotated in the direction of the arrow Q shown in FIG. 2B by driving the motor 50, the air sucked into the air flow path 20e from the suction port 20a flows through the air flow path 20e as indicated by the arrow P. Then, the air is blown out from the air outlet 20ba. At this time, the amount of air flowing near the case upper surface 21c of the first casing 21 is the largest, and the amount of air flowing near the impeller 23 is smaller than the amount of air flowing near the case upper surface 21c. . In FIG. 2B, the difference in the amount of flowing air is indicated by the thickness of the arrow, and the amount of flowing air is smaller as the thickness of the arrow becomes smaller.

  As shown in FIGS. 1B and 5, the partition plate 17 is provided with two communication holes 17 a. When the sirocco fan 20 is fixed to the partition plate 17, the flange portion 21g of the casing 20f of the sirocco fan 20 abuts and is fixed to the outer peripheral portion of the communication hole 17a. As a result, the air outlet 20ba is exposed to the heat exchanger chamber 90, so that air blown from the air outlet 20ba of the sirocco fan 20 is blown out to the heat exchanger chamber 90.

  Next, assembly of the sirocco fan 20 and attachment to the blower chamber 80 will be described with reference to FIGS. 3 to 5. First, the motor bracket 60 is fixed to the partition plate 17, and the motor 50 is attached to the motor bracket 60. Next, the left and right motor shafts 55 of the motor 50 are connected to the respective rotation centers of the two impellers 23. Next, after the impeller 23 is accommodated in the second casing 22, the first casing 21 is combined with the second casing 22. Next, as described above, the flange portion 21g of the casing 20f of the sirocco fan 20 abuts on the outer peripheral portion of the communication hole 17a of the partition plate 17, and the casing 20f is fixed to the partition plate 17. Then, the partition plate 17 to which the motor 50 and the sirocco fan 20 are attached is fixed to the housing 10.

  When the first casing 21 and the second casing 22 are assembled together, the first rear edge portion 21e provided at the lower end of the case side surface 21b of the first casing 21 at the rear of the first cutout portion 21f, and the case of the second casing 22 A second rear edge 22d provided behind the second notch 22e at the upper end of the side 22f abuts to form the rear joint 20d. The first rear side edge portion 21e and the second rear side edge portion 22d are formed to have the same thickness, and when the first casing 21 and the second casing 22 are assembled, the rear joining in the air flow path 20e is performed. There is no step in the portion 20d.

  In addition, when the first casing 21 and the second casing 22 are assembled, the left and right front edge portions 21d provided in front of the first notch portion 21f at the lower end of the case side surface 21b of the first casing 21 are the second casing 22. The tongue piece portion 22g and the lower surface portion 22ba are fitted into the front joining grooves 22c provided at the left and right ends of the tongue piece portion 22g and become the front joining portion 20c. The front joint groove 22c is formed in a concave shape corresponding to the thickness dimension of the front edge portion 21d. When the first casing 21 and the second casing 22 are assembled, the front joint groove 20c is formed at the front joint portion 20c in the outlet 20b. There are no steps or gaps.

  As described above, in the air flow path 20e formed by assembling the first casing 21 and the second casing 22, there is no step at the rear joint portion 20d between the first casing 21 and the second casing 22, The flow of air through which the joint portion flows through the air flow path 20e is not disturbed. Moreover, since the front junction part 20c of the 1st casing 21 and the 2nd casing 22 is located in the both corners of the lower end of the blowing part 20b, and a level | step difference and a clearance gap do not arise in the front junction part 20c, it flows through the blowing part 20b. Air does not leak from the front joint 20c, and the flow of air blown out from the outlet 20ba is not disturbed by the front joint 20c.

  Next, the side part which comprises a part of blowing part 20b of the casing 20f, and the shape of the baffle plate provided in the blowing part 20b are demonstrated using FIG. 2 thru | or FIG.

  First, the shape of the front side surface portion 21ba which is a side surface portion provided on the first casing 21 and constituting a part of the blowing portion 20b will be described. The left and right front side surface portions 21ba serve as the left and right side surfaces of the blowing portion 20b, and gradually move from the inside of the casing 20f toward the front end of the first casing 21, that is, the air outlet 20ba of the casing 20f, as shown in FIG. It is formed in an arc shape so as to expand. Specifically, the front end dimension H14 of the left and right front side surface parts 21ba is larger than the rear end dimension H13 on the blowing part 20b side.

  And the baffle plate formed in the upper surface part 21ca of the 1st casing 21 so that it may extend below continuously from the upper surface part 21ca is provided. In addition, let the rectifying plate provided in the upper surface part 21ca of the 1st casing 21 be the 1st rectifying plate 21a, and let the rectifying plate provided in the lower surface part 22ba of the 2nd casing 22 mentioned later be the 2nd rectifying plate 22a. The first rectifying plate 21a is composed of two rectifying plates provided symmetrically about the center line L1 in the left-right direction. In the front-rear direction, the front end of the first rectifying plate 21a is arranged in accordance with the front end of the first casing 21, that is, the air outlet 20ba of the casing 20f. And the 1st current plate 21a is formed so that it may have the same curvature as the right-and-left front side part 21ba mentioned above, and, specifically, the dimension H12 between the front ends of the two 1st current plate 21a is blowing out. It is formed to be larger than the rear end dimension H11 on the part 20b side.

  Next, the current plate provided in the second casing 22 will be described. As shown in FIG. 4B, the lower surface portion 22ba of the second casing 22 is provided with a rectifying plate formed so as to continuously extend upward from the lower surface portion 22ba. It is the 2nd baffle plate 22a. The second rectifying plate 22a is composed of two rectifying plates provided symmetrically about the center line L2 in the left-right direction. In the front-rear direction, the front end of the second rectifying plate 22a is arranged in accordance with the front end of the second casing 22, that is, the outlet 20ba of the casing 20f. The front end dimension H22 of the two second rectifying plates 22a is formed to be larger than the rear end dimension H21 on the blowing part 20b side. However, the second rectifying plate 22a has a smaller area than the first rectifying plate 21a, and the difference between the front end dimension H22 and the rear end dimension H21 of the second rectifying plate 22a is the front end of the first rectifying plate 21a. By making it smaller than the difference between the inter-dimension H12 and the rear-end dimension H11, the curvature of the second rectifying plate 22a is formed smaller than the curvature of the first rectifying plate 21a.

  As described above, the first rectifying plate 21a and the second rectifying plate 22a each have a curvature, and the respective front end dimensions H12, H22 are larger than the respective rear end dimensions H11, H21. The rectifying plate 21a and the second rectifying plate 22a are formed so as to gradually spread from the inside of the casing 20f toward the blowing portion 20b. Accordingly, when the casing 20f is integrally formed by injection molding, or when the blowing portion 20b is formed on either the first casing 21 or the second casing 22, the first rectifying plate 21a having the above-described shape and When the second rectifying plate 22a is provided, the first rectifying plate 21a and the second rectifying plate 22a form a so-called undercut portion, so that there is a problem that the casing cannot be removed from the mold after molding.

  On the other hand, the casing 20f of the present invention is formed of the first casing 21 and the second casing 22, and is provided in the front casing 21ba and the upper surface 21ca provided in the first casing 21, and the second casing 22. The blowing portion 20b is formed by the lower surface portion 22ba. The first rectifying plate 21 a is provided on the upper surface portion 21 ca of the first casing 21, and the second rectifying plate 22 a is provided on the lower surface portion 22 ba of the second casing 22. Therefore, the above-described undercut portion does not occur, and the first rectifying plate 21a is easily formed when the first casing 21 is formed, and the second rectifying plate 22a is easily formed when the second casing 22 is formed. Can do. Further, as described above, the shape of each current plate can be freely formed such that the areas and curvatures of the first current plate 21a and the second current plate 22a are different.

  Next, the effect which the 1st baffle plate 21a, the front side surface part 21ba, and the 2nd baffle plate 22a show with respect to the flow of the air which blows off from the blowing part 20b is demonstrated using FIG.

  When the motor 50 is driven to rotate the impeller 23 of the sirocco fan 20, the air in the air-conditioning chamber is drawn from the suction grill 170 shown in FIG. 6 into the suction duct 160 and the housing suction port 14 a provided in the back plate 14 of the housing 10. Flows into the blower chamber 80 inside the housing 10. The air that has flowed into the blower chamber 80 is sucked into each air flow path 20e via the suction port 20a of the sirocco fan 20, and blown out from the air flow path 20e to the heat exchanger chamber 90 via the blowout port 20ba.

As shown by an arrow F in FIG. 5, the flow of air blown from the blower outlet 20ba into the heat exchanger chamber 90 is spread and blown out in the left-right direction by the first rectifying plate 21a and the front side surface portion 21ba. Moreover, although illustration is abbreviate | omitted in FIG. 5, the flow of air spreads in the left-right direction and blows off also by the 2nd baffle plate 22a. Since the air flow spreads as described above, air spreads over the entire air inflow surface of the heat exchanger 30, so that the heat exchange efficiency in the heat exchanger 30 is improved.
The air passing through the heat exchanger 30 exchanges heat with the refrigerant flowing through the heat exchanger 30 and is blown out from the housing outlet 13a to the air conditioning chamber through the outlet duct 190 and the outlet grill 200.

  As described above, the amount of air flowing through the first casing 21 near the case upper surface 21c is the largest, and the amount of air flowing near the impeller 23 is larger than the amount of air flowing near the case upper surface 21c. Few. In the sirocco fan 20 of the present invention, the curvature and area are lower than the first rectifying plate 21a arranged at the uppermost part of the blowing part 20b having a large amount of flowing air at the lowermost part of the blowing part 20b having a small amount of flowing air. The second rectifying plate 22a having a small size is disposed. If the area and curvature of the second rectifying plate 22a are the same as those of the first rectifying plate 21a, the second rectifying plate 22a has a large resistance against the air flowing in the lowermost part of the blowing portion 20b with a small amount of flowing air. The flow rate of the air blown out from below the outlet 20ba is lowered and the flow does not spread. Therefore, by making the area and curvature of the second rectifying plate 22a smaller than those of the first rectifying plate 21a, how the air blown from the uppermost part of the blowing part 20b and the air blown from the lowermost part of the blowing part 20b are reduced. The spread is the same.

  In the embodiment described above, the case where the rectifying plates are provided on both the upper surface portion 21ca and the lower surface portion 22ba of the blowing portion 20b has been described, but the upper surface portion 21ca corresponds to the upper side of the blowing portion 20b with a large amount of flowing air. You may provide a baffle plate only in. In addition, the case where the first rectifying plate 21a and the second rectifying plate 22a have different curvatures and areas has been described. However, the first rectifying plate 21a and the second rectifying plate 22a may have the same curvature, differing only in area. Both curvature and area may be the same. Moreover, although the case where the curvature of the 1st baffle plate 21a was the same as the curvature of the front side plate 21ba was demonstrated, the curvature of the 1st baffle plate 21a is made into the front side plate 21ba according to the air quantity which flows over the blowing part 20b. It may be larger or smaller than the curvature. Furthermore, although the case where the junction part of the 1st casing 21 and the 2nd casing 22 in the blowing part 20b is located in the both corners below the blowing part 20b was demonstrated, it is not restricted to this, For example, the blowing part 20b The joint portion between the first casing 21 and the second casing 22 is located at both corners above the blowout portion 20b, so that the joint portion between the first casing 21 and the second casing 22 is at the corner portion of the blowout portion 20b. I just need it.

  In the present embodiment, the duct-type air conditioner indoor unit provided with the sirocco fan has been described as an example. However, the present invention is not limited to this, and the present invention performs heat exchange on the leeward side of the sirocco fan. It can be widely applied to the air conditioner with the equipment.

DESCRIPTION OF SYMBOLS 1 Indoor unit 10 Housing | casing 13a Housing | casing blower outlet 14a Housing | casing suction port 17 Partition plate 17a Communication hole 20 Sirocco fan 20a Suction port 20b Outlet part 20ba Outlet 20c Front junction part 20d Rear junction part 20e Air flow path 20f Casing 21 1st 1 casing 21a first baffle plate 21b case side surface 21ba front side surface portion 21c case upper surface 21ca upper surface portion 21caa front upper surface portion 21cb upper arc portion 21d front side edge portion 21e first rear side edge portion 21f first notch portion 22 second casing 22a 2nd baffle 22b Case lower surface 22ba Lower surface part 22bb Lower circular arc part 22c Front joint groove 22d 2nd rear edge part 22e 2nd notch part 22g Tongue piece part 23 Impeller 30 Heat exchanger 50 Motor 80 Blower room 90 Heat exchanger Room

Claims (3)

An air conditioner including an impeller that blows out air sucked in from a rotation axis direction in a radial direction, and a sirocco fan that includes a casing that houses the impeller,
The casing includes a blowout portion surrounded by an upper surface portion, a lower surface portion, and left and right side portions, and an opening end of the blowout portion serves as a blowout port,
The casing is composed of a first casing and a second casing,
The first casing has the upper surface portion and the left and right side portions, and the second casing has the lower surface portion,
While providing the 1st current plate in the 1st casing, providing the 2nd current plate in the 2nd casing ,
The left and right side portions of the first casing gradually expand toward the outlet, and the first rectifying plate and the second rectifying plate each have a curvature, and the first rectifying plate or the first rectifying plate The air conditioner characterized in that at least one of the two rectifying plates has the same curvature as that of the left and right side portions.   2. The air conditioner according to claim 1, wherein the first rectifying plate has a height dimension larger than that of the second rectifying plate. The air conditioner according to claim 1 or 2, wherein when the first casing and the second casing are assembled, end portions of the left and right side portions abut against the lower surface portion.

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