JP4380744B2 - Blower unit - Google Patents

Description

  The present invention relates to a fan guard structure of a blower unit such as an outdoor unit for an air conditioner.

  In general, in a blower unit such as an outdoor unit for an air conditioner, a fan guard having a grill structure that covers the air blower outlet is provided on the air blower outlet side from the viewpoint of safety and blower impeller protection ( For example, see Patent Documents 1 to 3).

  However, in such a fan guard, the presence of the fan guard itself becomes a resistance of the blown airflow, which causes a rise in the static pressure of the blower.

  Moreover, the interference sound and peeling sound between the airflow blown out from the impeller and the grill element are increased, and the noise level of the outdoor unit as a whole is increased.

For example, as shown in FIGS. 18 and 19, the entire fan guard 9 is formed in a grill structure with only steel wires a, b, c, and d, and the side surface portion has a grill structure similar to the blowout surface. However, there are few problems in the case (see, for example, Patent Document 3), but for example, as shown in FIGS. 13 to 15 and FIGS. In the case of the fan guard 9 that has a cylindrical frame wall portion that has a grill structure only on its front side opening surface (see, for example, Patent Documents 1 and 2), the degree of increase in static pressure is high. There is a problem that the amount of generated noise is large. This noise is expressed by the sixth power of the blown wind speed V (= V ⁶ ).

  That is, in the outdoor unit for an air conditioner of FIGS. 13 to 15, for example, in the trunk-shaped main body casing 1 which is long on the left and right and the air blowing side front plate 2 portion of the main body casing 1, the machine room is avoided. An air blowing opening 2a provided at a position, a synthetic resin fan guard 9 provided on the front side of the front plate 2 so as to cover the air blowing opening 2a, and the body casing 1 A side plate (left side plate) 5 on the fan chamber side and a side plate 4 on the machine chamber side, a top plate 8a and a bottom plate 8b of the main body casing 1, and leg portions 10 and 10 provided below the bottom plate 8b. It is configured.

  Then, when the blower is driven, the fan (impeller) rotates, and the air (outside air) sucked from the air suction port such as the back side of the main body casing 1 is used for air blowing on the front side. It blows out toward the front from the opening 2a.

  As described above, the fan guard 9 is provided on the outside of the air blowing opening 2a through which air is blown out in this manner. As shown in FIGS. 14 and 15, for example, It is formed in a rectangular cylindrical frame structure projecting with a predetermined width (length) in the forward air blowing direction.

  The front surface of the air blow grill 91 has a lattice structure, but the surrounding four frame wall portions 92a to 92d are all formed as blind plate surfaces having no openings.

  Therefore, in the fan guard 9 having such a configuration, for example, as shown in FIG. 15, the air blown forward from the air blowing opening 2 a on the front side of the main body casing 1 blows out from the air blowing grill 91 of the fan guard 9. When this is done, the fan guard 9 itself becomes the resistance of the blown airflow and raises the static pressure of the blower. As a result, noise due to interference between the lattice of the air blowing grill 91 and the blown airflow also increases.

  Further, in the case of the outdoor unit for the side suction and upward blowing type air conditioner shown in FIGS. 16 and 17, the entire front side 23 side and the left and right side surfaces 24, 25 of the rectangular main body casing 1 that is rectangular in the vertical direction are long. The surface of the front half of each side is formed in the air inlets 23a, 24a, 25a of the grill structure, respectively, while the entire rear side 22 and the substantially rear half of the left and right side surfaces 24, 25 are blind plates. In addition, a U-shaped heat exchanger in a plan view is provided in the front side air inlet 23a and the side air inlets 24a and 25a.

  On the other hand, a bottom plate 29 is provided on the lower surface, a cylindrical fan guard 28 is provided on the upper side, and a blower is provided on the upper portion of the heat exchanger below the inside (not shown). The fan guard 28 is drawn into a cylindrical structure at the upper part of a circular air blowing opening (not shown) of a flat rectangular tubular base cap 26a that is fitted to the upper end of the rectangular tubular main casing 1. And is formed to extend upward in a state of being slightly reduced in diameter. An air blow grill 27 having a lattice structure corresponding to the above-described blower and air blow outlet is provided on the upper end side opening surface.

  On the other hand, the cylindrical frame wall surface 26b is a cylindrical wall having a blind plate structure exactly the same as in the case of FIGS. Accordingly, even in such a configuration, the fan guard 9 itself becomes the resistance of the blown airflow, and becomes a factor of increasing the blower static pressure.

  In order to solve such problems, for example, in a trunk-type outdoor unit for an air conditioner, a heat exchanger is disposed on the suction side of the propeller fan, and an air blowing grill is disposed on the blowing side. A first blow-off passage extending from the first to the air blow-off grill, and the outside of the first blow-off passage along the downstream side of the fan guide (bell mouth) outside the fan radial direction and without opening through the air blow-off grill. By forming the second blowing flow path, the air flow blown from the propeller fan is divided into the first blowing flow path and the second blowing flow path, and is sent to the second blowing flow path side. There is one in which the air flow rate is reduced and the flow rate of the air flow blown from the first blow-out flow path to the air blow-out grill is reduced accordingly (see, for example, Patent Document 4).

  In order to solve the same problem, in the same trunk type outdoor unit for an air conditioner, the frame part on the outermost periphery of the grill element of the fan guard provided on the front side of the air outlet of the main casing is connected to the shaft of the fan motor. Extend the specified dimension in the direction, partially cut out the stretched part to create a narrow air passage between the blow grill and the outdoor unit main body casing, and part of the air flow in the blowing direction outside the circumferential direction Some of them are allowed to escape (see, for example, Patent Document 5).

Japanese Utility Model Publication No. 6-67895 JP 2002-195610 A Japanese Patent Application Laid-Open No. 5-248862 JP-A-8-189671 JP 2007-139242 A

  However, in the case of the former, in addition to the original first blowing passage extending from the propeller fan to the air blowing grille, the air blowing is performed along the downstream portion of the fan guy on the outside of the first blowing passage in the fan radial direction. Since it is necessary to form the second blow-off flow path that opens to the outside without going through the grill, special curved surface processing of the fan guide (bell mouth) blow-off side edge is required to form the passage. The passage structure itself is complicated.

  In addition, since a large amount of air flows through the second blowout flow path itself, noise control of the second blowout flow path becomes a problem.

  Furthermore, since a large left-right opening is formed between the air blowing grill and the main casing side partition plate (front plate), the appearance is poor and the air blowing grill mounting structure itself must be improved. I must.

  Next, in the latter case, the axial width of the outermost circular frame, which is essentially one of circular (annular) grill elements, is enlarged, and a thin notch extending in the circumferential direction is formed in a part of the circular frame. However, if a notch is cut into a part of the circular frame, a very large static pressure recovery effect cannot be expected, the rigidity of the circular frame itself is lowered, the grill support function is lowered, and the grill part is deformed. Cause.

  Further, if a notch is formed in the entire outer peripheral portion of the frame, in the case of an outdoor unit having an air outlet on the side wall portion of the main body casing, a short circuit is generated, which causes a problem of deteriorating the heat exchange efficiency of the heat exchanger.

The present invention has been made to solve the above-described problems, and a fan guard provided around the air outlet of an outdoor unit for an air conditioner is separated from a grill component that forms an air outlet surface. The air blowing cylinder and the cylindrical frame wall portion having a mounting frame function are provided on the other hand, while air is only applied to the frame wall surface portion other than the air intake port side short circuit surface of the fan guard frame wall portion. By providing an opening for blowing, the amount and speed of air blown from the fan guard air blowing surface of the grill structure are appropriately reduced, the degree of increase in static pressure is reduced, and interference between the grill components and the blowing air flow An object of the present invention is to provide an outdoor unit for an air conditioner that effectively reduces noise.

  In order to achieve the above object, the present invention is configured with the following problem solving means.

(1) Invention of Claim 1 The heat exchanger of this invention is the main body casing which has an air suction inlet and an air blower outlet, the bell mouth provided inside the said air blower outlet of this main body casing, and the said main body casing The air blower provided in the air passage from the air inlet to the air outlet, the flat air outlet surface of the grille structure corresponding to the air outlet of the main body casing, and a predetermined length in the air outlet direction. The fan guard comprises an air blowing cylinder separate from the bell mouth attached to the outer periphery of the air blowing outlet of the main body casing and a fan guard comprising a cylindrical frame wall portion having a mounting frame function. The air blowing surface of the grille structure and the cylindrical frame wall part are integrally formed of synthetic resin, and an opening for air blowing is provided on the frame wall surface of the cylindrical frame wall part. A blower unit, the blower upstream of the air flow passage and the heat exchanger having a shape corresponding to the shape of the air inlet of the body casing is provided to face the air inlet of the body casing, the cylindrical The opening for air blowing in the frame wall surface of the frame wall portion is close to the air inlet of the main casing that generates a short circuit corresponding to the shape of the heat exchanger and the opening position of the air inlet of the main casing. It is provided in frame wall surface parts other than a frame wall surface .

  According to such a configuration, first, the fan guard frame wall portion functions as an attachment frame for the air blowing cylinder and the main body casing, which are different structures from the grill component that forms a flat air blowing surface.

Therefore, it is easy to form an opening for blowing air on the frame wall of the frame wall, no special passage structure is required, and the shape of the air flow guide edge of the bell mouth and the partition plate is not required. It is.

  Moreover, since the cylindrical frame wall is configured as an attachment frame to the main body casing, it has high rigidity and is difficult to deform.

And the shape of the heat exchanger provided facing the air suction port in a shape corresponding to the shape of the air suction port on the main body casing side of such a fan guard frame wall portion and the air suction port position of the main body casing in relation to, and close to the air inlet and openings for the air outlet is provided in the frame wall portion other than the frame wall arising a short circuit, the efficiency from the opening of the frame wall of the fan guard frame wall well become air is blown, the amount of air that is blown out from a flat air blowing surface of the amount corresponding to the grill structure decreases, also decreases the blowing wind.

  As a result, the degree of increase in static pressure is also reduced, and noise due to interference between the grill element and the blown airflow at the blowout grill portion is also reduced.

The air blowing opening has a shape corresponding to the shape of the air inlet on the main body casing side and the shape of the heat exchanger provided facing the air air inlet and the position of the air inlet of the main body casing. because it only provided in the frame wall portion that does not cause a short circuit in the relationship, to avoid the short circuit of the blow-out air flow to the air suction port side, it is possible to avoid a reduction in the heat exchange efficiency as much as possible.

  As a result, the extra driving load of the fan motor of the blower is reduced, and the power consumption is also reduced.

  Moreover, there is no risk of reducing the heat exchange efficiency of the heat exchanger.

(2) Invention of Claim 2 The heat exchanger of this invention is the structure of the invention of said Claim 1, The opening of the frame wall surface of a fan guard frame wall part is formed in multiple numbers, It is characterized by the above-mentioned.

  The opening formed in the frame wall surface of the fan guard frame wall portion has an opening of a predetermined shape in order to ensure an appropriate amount of blowing air without increasing the size of the opening from the viewpoint of safety and strength. It is preferable to form a plurality in positional relationship.

(3) Invention of Claim 3 The heat exchanger of this invention is the structure of the invention of said Claim 2, The some opening is respectively reinforced by the rib, It is characterized by the above-mentioned.

  According to such a configuration, it is possible to sufficiently reinforce the rigidity and strength of the frame wall portion in which the plurality of openings are formed, and reliably avoid deformation due to the action of the pressing force on the frame wall surface of the frame wall portion. Will be able to.

(4) Invention of Claim 4 In the heat exchanger of the present invention, in the structure of the invention of Claim 1, 2 or 3, the fan guard has a rectangular structure, and each of the four corners has a main body casing. A mounting recess having a screwing hole for fastening and fixing to the outer periphery of the air outlet using screwing means is provided.

  According to such a configuration, screw means such as a screw screw can be screwed into the mounting recess of the fan guard frame wall, and can be fixed to the main body casing very easily, making the mounting work easy and stable. Is possible.

  As a result, according to the present invention, the amount and speed of the air blown out from the front opening surface of the fan guard having the grill structure is reduced or lowered, and the degree of increase in static pressure is reduced accordingly, and the grill of the blowout grill Noise due to interference between the element and the airflow is also reduced.

  As a result, the extra driving load of the fan motor is reduced and the power consumption is also reduced. Therefore, it is possible to realize a blower unit with low noise and excellent energy saving.

  In addition, the heat exchange efficiency of the heat exchanger due to the short circuit does not decrease.

(Best Embodiment 1)
FIGS. 1-7 has shown the structure of the whole ventilation unit which concerns on the best Embodiment 1 of this invention, and the principal part. In this embodiment, for example, an air conditioner outdoor unit is selected as the blower unit.

  1 and 2 show the overall structure of the outdoor unit for the air conditioner.

  This outdoor unit for an air conditioner includes an L-shaped heat exchanger 11 in a plan view composed of a back-side long piece 11a and a side-side short piece 11b, a blower 12 comprising a fan motor 12a and a fan (impeller) 12b, For example, a trunk-shaped main body casing 1 that houses a compressor 13 for compressing refrigerant and the like that is long on the left and right, and a front plate 2 that is on the front side of the air blowing side of the main body casing 1 and supports the fan motor 12a of the blower 12, for example. An opening 2a for air blowing provided at a position avoiding the machine room M of the front plate 2, a bell mouth B having a cylindrical structure provided in an inner portion of the opening 2a, and a front surface of the front plate 2 The air suction provided in the position which avoided the machine room M of the back plate 3 of the said main body casing 1, and the synthetic resin fan guard 9 attached so that the said opening 2a for air blowing may be covered. 3a, a side plate (left side plate when viewed from the front) 5 of the main casing 1 on the fan chamber F side, an air inlet 5a provided in the side plate 5, a top plate 8a and a bottom plate of the main casing 1 8b and leg portions 10 and 10 provided at the bottom of the bottom plate 8b.

  The L-shaped heat exchanger 11 as a whole is disposed so as to correspond to both the air suction port 5a of the side plate 5 on the left side surface side from the air suction port 3a on the rear plate 3 side of the main body casing 1, 6 and 6 are supported.

  On the other hand, the blower chamber F side in which the blower 12 and the heat exchanger 11 in the main body casing 1 are provided and the machine chamber M side in which the compressor 13 is provided are partitioned via a partition plate 7.

  When the fan motor 12a of the blower 12 is driven, the fan (impeller) 12b rotates, and the air (outside air) sucked from the air suction ports 3a and 5a passes through the bell mouth 6. It blows out forward from the opening 2a for air blowing on the front side.

  By the way, the fan guard 9 is provided outside the air blowing opening 2a through which air is blown in this way, as described above. This fan guard 9 is shown in FIGS. 3 and 4, for example. Thus, it forms in the square cylinder frame structure which has a predetermined | prescribed width | variety (length) W and protrudes in the front side air blowing direction as a whole.

  The front side is a flat air blowing grill (air blowing surface) 91 having a lattice structure, as is apparent from, for example, FIGS. The frame wall surfaces of the frame wall portions 92a to 92d are formed on a blind plate surface having no opening at all, while the frame wall surface of the frame wall portion 92b on the left side surface side corresponding to (close to) the left side plate 5 of the main body casing 1 is formed. On the frame wall surface of the frame wall portion 92a on the other right side and the frame wall portions 92c and 92d on both upper and lower sides, for example, three sets of slit structure openings arranged side by side in the width direction as shown in FIG. 93, 93... Are provided at predetermined intervals in the longitudinal direction, so that a predetermined amount of air can be blown out not only in the front direction but also in the side direction.

Therefore, in the fan guard 9 having such a configuration, for example, as shown in FIGS. 6 and 7, the air blown forward from the air blowing opening 2 a on the front side of the main body casing 1 is the air blowing grill of the fan guard 9. 91 is blown out as a mainstream, and is provided on each of the frame wall surfaces of the right side frame wall portion 92a and the upper and lower double side frame wall portions 92c and 92d excluding (other than) the frame wall surface of the left side frame wall portion 92b. A predetermined amount of air is blown out as a secondary flow from the plurality of openings 93, 93..., And the air blown out from the opening surface of the front-side air blowing grill 91 of the fan guard 9 having a grill structure. The amount and speed of the air flow are reduced and reduced, and the degree of increase in static pressure is reduced accordingly, and noise due to interference between the grill element of the air blowing grill 91 and the blowing air flow is also reduced.

  As a result, an extra driving load of the fan motor 12a of the blower 12 is also reduced, and power consumption is also reduced.

  Therefore, it is possible to realize a blower unit with low noise and excellent energy saving.

Moreover, in the case of the above-described configuration, the heat exchanger 11 having an L-shaped structure corresponding to the shape of the air inlets 5a and 5b of the main body casing 1 is provided upstream of the air blowing passage of the air blowing chamber F in the main body casing 1 . The plurality of openings 93, 93... Are provided facing the air suction ports 5 a, 5 b, and the relationship between the shape of the heat exchanger 11 and the opening positions of the air suction ports 5 a, 5 b of the main body casing 1. Avoid the frame wall surface of the left side wall 92b that is likely to cause a short circuit ( the frame wall 92b on the left side that is close to the opening of the air inlets 5a and 5b of the main casing 1 and tends to cause a short circuit). Other than the frame wall portions 92a, 92c, and 92d) .

  Therefore, according to such a structure, it becomes possible to avoid the short circuit of the blowing airflow to the heat exchanger 11 side air suction inlet 5a reliably, and the fall of the heat exchange efficiency of the heat exchanger 11 can be avoided. .

  Of course, when it is not necessary to consider the short circuit, a plurality of openings 93, 93... Can be provided on the frame wall surfaces of all the frame wall portions 92a to 92d.

  Further, in the case of this embodiment, triangular corner ribs 95, 95... Are provided inside the four corner portions of the frame wall portions 92 a to 92 d of the fan guard 9, respectively. The fan guard 9 is provided on the front plate 3 of the main body casing 1 by inserting and screwing screw screws 97, 97... Into the corner ribs 95, 95. Screw fixing recesses 96, 96... Having screw holes (screw holes) for fastening and fixing to the outer periphery of the air outlet 3 b are provided.

  Therefore, the frame wall portions 92a to 92d of the fan guard 9 have sufficient strength and support rigidity as a mounting frame for the air blowing grill 91, which is a structure different from the grill component, and are extremely stable. Thus, it is securely attached to the front surface of the main casing 1.

  Further, the blowing grill 91 extends in a cylindrical shape by a predetermined width (length) W in the air blowing direction to form a rectangular tube-shaped air blowing cylinder, and the above-described openings 93, 93 are formed on the cylindrical wall surface. .. is formed in a plurality of rows in the extending direction and the circumferential direction, so that the installation is easy and the appearance is good, the air is smoothly blown out, and the noise during the blowing is small.

  Further, a special passage structure as in the prior art is not necessary, and the shape processing of the airflow guide edge of the bell mouth and the partition plate is not necessary.

  Moreover, since it is comprised as an attachment frame to a main body casing, rigidity is also high and it cannot change easily.

(Modification)
The openings 93, 93... In the frame wall surfaces of the frame wall portions 92b to 92d in the configuration of the fan guard 9 described above have an elongated slit structure with a width that does not allow human fingers to enter. However, if the lengths thereof are increased, the number can be reduced (for example, from 3 sets 6 in FIG. 5 to 2 sets 4 in FIG. 8).

  However, the longer the length of the openings 93, 93,..., The lower the rigidity of the grill wall of the openings 93, 93,..., For example, as shown in FIGS. The pressure becomes weak against the pressing force P, and a large deformation is likely to occur.

  Of course, in this case, it is conceivable to increase the rigidity by increasing the thickness of the frame wall, but if so, the weight of the entire fan guard 9 increases and the cost also increases. Further, when the width of the portion A between the openings 93 and 93 is increased, the length of the openings 93 and 93 is decreased.

  Therefore, as a countermeasure, in the present embodiment, as shown in FIG. 9, for example, as shown in FIG. 9, the intermediate wall rear surface side (fan 12b) of the openings 93, 93, 93, 93,. Reinforcing ribs L, L.

  In this way, even if the lengths of the openings 93, 93... Are slightly increased, the rigidity of the same portion is sufficiently increased, and the deformation with respect to the pressing force P as shown in FIGS. The amount becomes smaller.

  These reinforcing ribs L, L... May be joined and integrated separately, but preferably, the entire fan guard 9 is integrally formed with the openings 93, 93. preferable.

  The reinforcing ribs L, L... Are not limited to the case where two sets of openings 93, 93 are provided in the longitudinal direction as shown in FIG. Needless to say, it may also be provided.

(Best Mode 2)
Next, FIG. 11 and FIG. 12 show the configuration of the whole and main parts of the blower unit according to the second embodiment of the present invention.

  Also in this embodiment, for example, an air conditioner outdoor unit is selected as the blower unit. However, in this embodiment, the air conditioner outdoor unit is sucked into the three sides, and the upper blowout type. It is characterized by being composed of things.

In the case of such an outdoor unit for an air conditioner, the surface of the front casing 23 side of the rectangular main body casing 1 that is long in the vertical direction and the substantially front half surfaces of the left and right side surfaces 24 and 25 are respectively grilled. The air suction ports 23a, 24a and 25a are formed on the rear surface 22 side, and the rear half portions of the left and right side surfaces 24 and 25 are blind plates, respectively. 23a, the side surface side air inlet 24a, in a manner corresponding to each of 25a (facing in) heat exchanger in plan view U-shaped is provided.

  On the other hand, a bottom plate 29 is provided on the lower surface, a cylindrical fan guard 28 having an air blowing cylinder and a mounting frame function is provided on the upper side, and a blower is provided on the inner lower side thereof (not shown). The fan guard 28 is attached by being drawn into a cylindrical structure at the upper part of the air blowing opening of the flat rectangular tube base cap 26a that is meshed with the upper end of the rectangular tube main body casing 1. It is formed to extend upward with a slightly reduced diameter. An air blow grill 27 having a circular lattice structure corresponding to the above-described blower and air blow outlet is provided on the upper end side opening surface.

  On the other hand, on the frame wall surface of the cylindrical frame wall portion 26b, openings 93, 93... Having slit structures that are long in the circumferential direction in two rows in the vertical width direction as in the case of the above-mentioned best embodiment 1. Are provided at a predetermined interval in the circumferential direction (two rows in the vertical direction and multiple rows in the circumferential direction).

  Thus, a predetermined amount of air can be blown not only in the upper surface side air blowing grill 27 but also in the side surface side horizontal direction.

  Therefore, in the fan guard 28 having such a configuration, the air blown upward from the blower in the main body casing 1 is the air on the upper surface side of the fan guard 28 as in the case of the first embodiment. The air is blown out from the blow-out grill 27 and is also blown out from the plurality of openings 93, 93... On the frame wall surface of the frame wall portion 26b, and is blown out from the air blow-off grill 27 on the upper surface side of the fan guard 28. The air volume and the wind speed are reduced or lowered, and the degree of increase in static pressure is reduced accordingly, and the noise caused by the interference between the grill element of the air blowing grill 27 and the blown airflow is also lowered.

  As a result, the extra driving load of the fan motor is reduced and the power consumption is also reduced. Therefore, it is possible to realize a blower unit with low noise and excellent energy saving.

In addition, in the case of the above-described configuration, the openings 93, 93... Are the same as the shape of the air inlets 23 a, 24 a, 25 a of the main casing 1 and the shape and position of the heat exchanger 11 corresponding to the shape. Therefore , avoid the front half of the front and left and right sides of the frame wall where the short circuit is likely to occur (the front side and the left and right front half where the short circuit is likely to occur near the air inlets 23a, 24a, 25a of the main casing 1). It is provided on the frame wall surface other than the frame wall surface .

  Therefore, according to such a structure, it becomes possible to avoid the short circuit of the blowing airflow to the heat exchanger 11 side air suction port 23a, 24a, 25a side, and it can avoid the fall of heat exchange efficiency.

  Further, in the above configuration, the frame wall portion of the fan guard 28 functions as a mounting frame for the air blowing cylinder and the main body casing, which are different from the grill components in which the air blowing grill 27 having a lattice structure is integrally formed. ing.

  Therefore, it is easy to form the openings 93, 93... In the frame wall surface of the frame wall portion, no special passage structure is required, and the shape processing of the air flow guide edge of the bell mouth and the partition plate is not necessary. .

  Moreover, since it is comprised as an attachment frame to the main body casing 1 side base cap 26a, it has high rigidity and is difficult to deform.

(Modification)
Also in this embodiment, it is needless to say that reinforcing ribs L, L,... Similar to those in FIG.

It is a front view of the ventilation unit (air conditioner outdoor unit) according to the first embodiment of the present invention. It is a horizontal sectional view of the same ventilation unit. It is the expansion perspective view seen from the right diagonal upper part of the fan guard part of the ventilation unit. It is the expansion perspective view seen from the left diagonal upper part of the fan guard part of the ventilation unit. It is a side view of the part which formed the opening of the fan guard frame wall part of the ventilation unit. It is sectional drawing (AA of FIG. 1) of the horizontal direction of the fan guard part of the same ventilation unit. It is sectional drawing (BB of FIG. 1) of the perpendicular direction of the fan guard part of the same ventilation unit. It is a side view of the opening formation part of the fan guard frame wall part which concerns on the modification of the ventilation unit. It is a side part rear view of the opening formation part of the fan guard frame wall part which concerns on the modification of the same ventilation unit. It is a figure which shows the effect (shape before and behind a deformation | transformation) by the structure of the modification of the ventilation unit. It is a front view of the ventilation unit (air conditioner outdoor unit) according to the best embodiment 2 of the present invention. It is a top view of the ventilation unit. It is a front view which shows the structure of the conventional ventilation unit (outdoor unit for trunk type air conditioners). It is the expansion perspective view seen from the right diagonal upper part of the fan guard part of the ventilation unit. It is sectional drawing of the horizontal direction (and vertical direction) of the fan guard part of the ventilation unit. It is a front view which shows the structure of the conventional ventilation unit (the side suction upper blowing type outdoor unit for air conditioners). It is a top view of the ventilation unit. It is a front view which shows the structure of the conventional ventilation unit (Outdoor unit for trunk type air conditioners) which employ | adopted the steel wire type grill structure fan guard. It is a disassembled perspective view of the principal part which shows the structure of the conventional ventilation unit (The side suction upper blowing type outdoor unit for air conditioners) which employ | adopted the fan guard of the steel wire type grill structure.

  1 is a main body casing, 9 is a fan guard, 12 is a blower, 91 is an air blowing grille, 92a to 92d are frame wall surfaces, 93 is an opening, and L is a reinforcing rib.

Claims (4)

A main body casing having an air inlet and an air outlet, a bell mouth provided inside the air outlet of the main body casing, and an air passage extending from the air inlet to the air outlet of the main body casing The air blower and the flat air outlet surface of the grille structure corresponding to the air outlet of the main body casing, and the air blow direction having a predetermined length in the air outlet direction are attached to the outer periphery of the air outlet of the main body casing. It consists of an air blowing cylinder separate from the bell mouth and a fan guard composed of a cylindrical frame wall having a mounting frame function, and the air blowing surface and the cylindrical frame wall of the grill structure of the fan guard are combined. A blower unit that is integrally molded with resin and has an air blowing opening on the frame wall surface of the cylindrical frame wall portion, on the blower of the blower passage A heat exchanger having a shape corresponding to the shape of the air inlet of the body casing is provided to face the air inlet of the body casing, the air outlet in the frame wall of the tubular frame wall portion The opening is provided in a frame wall surface portion other than the frame wall surface close to the air suction port of the main body casing that generates a short circuit , corresponding to the shape of the heat exchanger and the opening position of the air suction port of the main body casing . A blower unit characterized by that.   The blower unit according to claim 1, wherein a plurality of openings in the fan guard frame wall are formed.   The blower unit according to claim 1 or 2, wherein each of the plurality of openings is reinforced through a rib.   The fan guard has a rectangular structure, and each of the four corners thereof is provided with a screwing hole for fastening and fixing to the outer periphery of the air outlet of the main body casing using screwing means. The blower unit according to claim 1, wherein a recess is provided.

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