JP4449559B2 - Fan guard for blower unit - Google Patents

Description

  The present invention relates to a fan guard structure of a blower unit that prevents entry of foreign matter.

  An outdoor unit 1 of an air conditioner, which is an example of a blower unit, generally includes a heat exchanger and a propeller fan inside a box-shaped main casing 2 as shown in FIG. A fan guard 3 having a grill structure as a fan protection member is provided outside the front air outlet through the fan guide (bell mouth) 2. When the propeller fan rotates, the air sucked from the back side air intake port and passed through the heat exchanger passes through the air blower outlet and the fan guard 3 from the propeller fan and bell mouth to the outdoor unit 1. Blows forward.

  When the fan guard 3 is provided in this way, for example, foreign matter can be prevented from entering in relation to the outside of the main casing 2, accidental insertion of an incorrect finger or the like can be prevented, and the internal propeller fan can be protected. The propeller fan is difficult to see from the outside, and the exterior of the main body casing is excellent in exterior and the outdoor unit has a harmonized structure.

  For example, as shown in FIG. 12, the fan guard 3 includes a substantially rectangular outer frame 4 provided on the outer periphery of the air outlet on the front side of the main body casing 2, and a center position that is substantially the same as the rotation axis of the fan. A substantially square shaped blocking plate 5 that covers the central portion of the fan guard 3 in a matched state, and a plurality of radial ribs 6, 6 that extend radially outward from the outer periphery of the blocking plate 5 toward the radially outer side (outer frame). ... and a plurality of annular ribs integrated with the plurality of radial ribs 6, 6, ... and arranged concentrically around the rotation axis of the fan at predetermined intervals in the radial direction. 7, 7...

  The plurality of radial ribs 6, 6... And the plurality of annular ribs 7, 7... Are integrally molded with a synthetic resin, for example, so as to cross each other.

  Incidentally, as one of the required functions for this type of fan guard 3, for example, as shown in FIG. 13, the finger 10 is accidentally inserted between the ribs 6, 6,..., 7, 7,. There is strength that can prevent entering. When the object of a predetermined size is pressed against the cell space portion of the fan guard 3 with a predetermined force, the strength between the ribs 7, 7... In the case of the fan guard 3 composed of the annular ribs 7, 7... And the radial ribs 6, 6. Becomes the design reference value.

  However, in this type of fan guard 3, since the distance between the radial ribs 6, 6,... Becomes narrower as it approaches the central portion (blocking plate 5), the ventilation resistance increases and noise increases.

  Therefore, as a conventional example for solving this, for example, the rib interval at the outermost peripheral part of the fan guard is used as a reference, the rib interval becomes denser toward the inner peripheral side, and the rib interval becomes twice the reference. On the inner side, there is one that suppresses an excessive increase in ventilation resistance at the inner peripheral side portion by thinning out radial ribs (see, for example, Patent Documents 1 and 2).

  If the cross-sectional shapes of the annular ribs 7, 7... And the radial ribs 6, 6... Are constant, the finger or the like enters most at the outermost peripheral portion where the opening area of the cell space portion is maximum. For ease of finger insertion, the dimensions such as rib cross-section and rib spacing are determined so that a predetermined strength can be ensured at the outermost peripheral part. The inner portion is excessively strong.

  Therefore, in order to solve such a problem, for example, the thickness of the annular rib may be increased as it goes outward, and the cell space area may be reduced, and the thickness of the rib may be reduced as the inner side becomes easier in strength. .

  On the other hand, in the case of a fan guard of a blower unit installed outdoors, such as the outdoor unit of the air conditioner described above, in addition to the function of preventing foreign matter from entering between the ribs, the fan guard is bent and deformed, A function to prevent the fan from being damaged by contacting the trailing edge of the blade is also necessary. The cause of such deflection of the fan guard is, for example, when an object such as a ball collides with the fan guard and the central portion of the fan guard is deflected, or when the fan rotation axis is vertically upward and the fan guard is on the fan guard in winter. There are cases where snow is piled up and the fan guard bends due to the weight of the snow.

  In the case of the fan guard 3 composed of the above-mentioned annular ribs 7, 7... And the radial ribs 6, 6... When a load is applied to the portion, the proportion of the radial ribs 6, 6... Is greater than the annular ribs 7, 7. Therefore, the number of the radial ribs 6, 6..., The manner of arrangement, the cross-sectional shape, and the like have a great influence on the deflection strength.

  Therefore, it is difficult to change the number of radial ribs 6, 6.

JP 2002-195610 A (page 1-4, FIG. 1-8)

JP 05-248662 A (page 1-8, FIG. 1-11)

  As described above, in a fan guard having a grill structure composed of radial ribs and annular ribs, it is necessary to close the intervals between the annular ribs in order to prevent intrusion of foreign substances from between the annular ribs. However, if it does so, since the opening area of a cell part will decrease, ventilation resistance and pressure loss will rise, and the problem that ventilation noise and the input of a fan motor will increase will arise.

  On the other hand, in the case of a fan guard with thinned radial ribs on the inside, the increase in ventilation resistance can be suppressed, but the deflection strength of the fan guard decreases at the center side, causing damage due to contact between the fan fan blades and the fan guard. Problems arise.

  Therefore, in view of such circumstances, the present invention provides a local thick portion near the center of the opening of the rib that forms the horizontally long opening, thereby preventing the spread between the ribs and the strength of the shaft. To provide a fan guard for a blower unit that can prevent the intrusion of foreign matters without increasing the ventilation resistance, while ensuring both the strength to prevent deflection of the fan guard due to load in the direction. It is the purpose.

In order to achieve the above object, the present invention is configured with the following problem solving means.
(1) First problem solving means The first problem solving means of the present invention is arranged on the air outlet side of the blower fan, and has an outer frame 4 on the outer periphery, and between the outer frames 4. The annular ribs 7, 7... Are arranged concentrically with a predetermined interval in the radial direction around the rotation axis of the blower fan, and from the vicinity of the center around the rotation axis of the blower fan. In the fan guard 3 of the blower unit including the radial ribs 6, 6... That extend radially toward the frame 4, the annular ribs 7, 7 that form the openings A that are substantially horizontally long in the circumferential direction. Are provided with local thick portions 8, 8... In the vicinity of the center of.

  In such a configuration, when the foreign material 10 is about to enter, the annular ribs 7, 7... Have thick portions 8, 8. After that, it moves to either the left or right side of the opening A.

  And as it moves to either one of the left and right sides, it approaches the root of the radial ribs 6, 6... And the opening A becomes difficult to expand, so that the entry of the foreign material 10 can be suppressed after all.

  Of course, in that case, the opening area of the opening A is reduced by the thick portions 8, 8..., But the decrease is smaller than the case where a complete rib is additionally provided, and the increase in ventilation resistance and pressure loss is sufficient. Can be suppressed.

  Therefore, it is not necessary to increase the blowing sound and the fan motor input.

Further, since the number, arrangement, and cross-sectional shape of the annular ribs 7, 7... And the radial ribs 6, 6... Are not changed at all, the bending strength is not lowered at all.
(2) Second Problem Solving Means According to a second problem solving means of the present invention, in the configuration of the first problem solving means, local thick portions 8, 8. Are provided only on either the inside or the outside of.

  According to such a configuration, the effect of preventing the intrusion of the foreign material 10 can be exhibited without reducing the opening area of the opening A as much as possible. And blowing resistance and pressure loss are also small.

Of course, sufficient deflection strength can be secured.
(3) Third Problem Solving Means According to a third problem solving means of the present invention, in the configuration of the first or second problem solving means, the locally thick portions 8, 8,. The opening area of the opening A is limited to a portion larger than a predetermined area.

According to such a configuration, for example, the opening area of the opening A is originally small, and it is not necessary to provide the thick portions 8, 8,. It is easy and the rise of draft resistance is small.
(4) Fourth Problem Solving Means The fourth problem solving means of the present invention is arranged on the air outlet side of the blower fan, and has an outer frame 4 on the outer periphery, and between the outer frames 4 In the fan guard 3 of the blower unit comprising horizontal ribs and vertical ribs, local thick portions 8, 8... Are provided in the vicinity of the center of the horizontal ribs that form the substantially horizontally long opening A. It is characterized by.

  According to such a configuration, when the foreign material 10 is about to enter, the long side horizontal rib portion has the thick portions 8, 8,. To the left or right side of the opening A. And as it moves to either one of the left and right sides, it approaches the root of the vertical rib, and the interval between the openings A becomes difficult to increase, so that the entry of the foreign material 10 can be suppressed.

  Of course, in this case as well, the opening area of the opening A is reduced by the thickness of the thick portions 8, 8..., But the reduction is smaller than the provision of an extra complete rib, and ventilation resistance and pressure loss are reduced. Can be suppressed. Therefore, it is not necessary to increase the blowing sound and the fan motor input.

Further, unlike the case of thinning out the vertical ribs and horizontal ribs, it is not necessary to change the number and thickness of the ribs, so that the necessary deflection strength of the opening A and the entire fan guard can be secured.
(5) Fifth Problem Solving Means The fifth problem solving means of the present invention is the long side of the substantially horizontally long opening A in the first, second, third or fourth problem solving means. Is characterized in that the positions of the thick portions 8, 8... Are shifted from each other on the upper and lower sides of the ribs.

  According to such a configuration, when the foreign object 10 is about to enter, the long side annular or horizontal rib portion has the thick portions 8, 8. Although it moves to either the left or right side, the movement at that time is more likely to occur.

(6) Sixth Problem Solving Means The sixth problem solving means of the present invention is a central portion in the outer frame 4 in the configuration of the first, second, third, fourth or fifth problem solving means. Is characterized in that a closing plate 5 is provided.

  In such a configuration, the radial ribs 6, 6... Of the first, second, or third problem solving means extend radially from the outer periphery of the closing plate 5 in the radial direction of the outer frame 4. Become.

  Further, the horizontal ribs and vertical ribs near the center of the fourth problem solving means extend from the outer periphery of the closing plate 5 to the outer frame 4 side.

  As a result of the above, according to the present invention, after sufficiently securing both the rib spreading suppression strength for preventing the intrusion of foreign matter between the ribs and the fan guard deflection preventing strength due to the axial load load, An increase in ventilation resistance of the blown airflow can be suppressed, and noise and fan input can be reduced.

(Best Embodiment 1)
First, FIG. 1 to FIG. 3 show the configuration of a fan guard of a blower unit according to the best embodiment 1 of the present invention.

  Also in the case of the present embodiment, a front blow type outdoor unit for an air conditioner similar to that of the above-described conventional example is employed as the blower unit.

  In FIG. 1, the code | symbol 3 is a fan guard provided in the front side air blower outlet part of the outdoor unit for air conditioners.

  The fan guard 3 has a substantially rectangular outer frame 4 provided on the outer periphery of the air outlet, and a substantially rectangular shape that covers the center of the fan guard 3 in a state where the center position substantially coincides with the rotation axis of the fan. A plurality of radial ribs 6, 6... Extending radially toward the outer frame 4 radially outward from the outer periphery of the closing plate 5 and radially drawing a parabola in the rotation direction of the blower fan; A plurality of annular ribs 7, 7... Integrated with the plurality of radial ribs 6, 6... Concentrically around the rotation axis of the blower fan and arranged at predetermined intervals in the radial direction.・ It is composed of As a result of the above, the radial ribs 6, 6... Are formed between the two annular ribs 7 and 7 and the distance between them increases from the closing plate 5 side toward the outer frame 4 side. The area of the horizontally long opening in the circumferential direction of the cell spaces A, A...

  The plurality of radial ribs 6, 6... And the annular ribs 7, 7. These are integrally molded in a grill structure as shown.

  By the way, in the case of the present embodiment, in such a configuration of the fan guard 3, the annular rib 7 constituting the long side of each cell space (each unit opening of the grill portion) A that is horizontally long in the circumferential direction. .., 7... Are provided with local circular thick portions 8, 8... Each having a predetermined diameter, as shown in FIG.

  In the case of such a configuration, for example, as shown in FIG. 3, when a foreign object 10 such as a stone or a finger is about to enter, the central portions of the annular ribs 7, 7. Are formed with a narrow space between the central portions of the cell spaces A, A..., Thereby substantially increasing the strength (suppressing force) in the expanding direction. Thus, the foreign substance 10 moves to either the left or right side of the cell space A, A... (To the left when entering the left side of the thick portions 8, 8 and to the right when entering the right side). And as it moves to either the left or right side in this way, it approaches the root of the radial ribs 6, 6... That fix the annular ribs 7, 7, and the cell space A is not easily expanded.

  Therefore, entry of the foreign material 10 into the air outlet can be suppressed. Of course, the opening area of the cell space A is reduced by the semicircular protrusions of the thick portions 8, 8..., But the reduction is smaller than in the case of providing a complete rib, and ventilation resistance is reduced. In addition, an increase in pressure loss can be sufficiently suppressed.

  Therefore, it is not necessary to increase the blowing noise and the fan motor input as in the prior art.

  Further, unlike the case of thinning out the radial ribs 6, 6... And the annular ribs 7, 7,. The necessary deflection strength can be ensured.

  Therefore, for example, an air blower outlet is provided on the upper surface side of the main casing, and the fan shaft of the blower fan is installed in the vertical direction. be able to.

  In the above case, the thick portions 8, 8,... Of the annular ribs 7, 7,... Do not necessarily have to be provided on all the annular ribs 7, 7,. As shown, the opening width (circumferential width) of the cell space A defined by the interval between the radial ribs 6 and 6 adjacent to each other is larger than a predetermined dimension, and the interval between the annular ribs 7 and 7 is likely to widen. .. Are limited to the annular ribs 7, 7...

  According to such a configuration, the opening width in the circumferential direction of the cell space A is originally small, and it is not necessary to provide the thick portion 8 on the inner peripheral side where there is no possibility of the intrusion of the foreign material 10. Simple and inexpensive, and the degree of increase in draft resistance is small.

(Best Mode 2)
Next, FIGS. 4 and 5 show the configuration of the fan guard of the blower unit according to the second preferred embodiment of the present invention.

  The fan guard 3 of this embodiment is configured with the thick portions 8, 8... Of the annular ribs 7, 7... In the configuration of the best embodiment 1 on the long side of the cell space A. The annular rib 7 and the annular rib 7 side constituting the short side are provided so that the positions near the center are positively shifted to the left or right.

  As a result, the thick portions 8, 8... Are thickly arranged in the radial direction between the radial ribs 6, 6... That gradually increase in mutual distance from the central portion side to the outer frame 4 side direction. The meat portions 8, 8... Are arranged in a zigzag shape as a whole.

  According to such a configuration, when the foreign material 10 is about to enter, the annular ribs 7, 7... Of each cell space A, A. Due to the presence of the portions 8, 8,..., For example, the same action as in FIG. 3 is effective in the upper cell space A of FIG. 4, and the action of FIG. 5 is more effective in the lower cell space A. Will occur. As a result, the foreign material 10 is less likely to enter.

(Best Mode 3)
Next, FIG. 6 shows the configuration of the fan guard of the blower unit according to the third embodiment of the present invention.

  In the fan guard 3 of this embodiment, the thick portions 8, 8,... Of the annular ribs 7, 7,. It is characterized in that it is provided for every other.

  Even with such a configuration, it is possible to obtain substantially the same operation as that of the best embodiment 1, while the amount of increase in ventilation resistance is about ½.

(Fourth Embodiment)
Next, FIG. 7 shows the configuration of the fan guard of the blower unit according to the fourth embodiment of the present invention.

  In the fan guard 3 of this embodiment, the shape of the thick portions 8, 8,... Of the annular ribs 7, 7,. It is characterized by having changed to.

  In short, the shape of the thick portions 8, 8... Is not limited to the circular shape as described above, as long as it can prevent the intrusion of the foreign material 10 as described above. Various polygonal shapes not shown may be used.

(Best Mode 5)
Next, FIGS. 8 and 9 show the configuration of the fan guard of the blower unit according to the fifth embodiment of the present invention.

  In the fan guard 3 of this embodiment, the thick portions 8, 8... Of the annular ribs 7, 7... In the configuration of the best embodiment 1 are not circular but semicircular. .., 9..., And is provided so as to protrude only on the radially outer peripheral surface side (or the inner peripheral surface side) of each annular rib 7, 7.

  According to such a configuration, substantially the same as in the third embodiment (FIG. 6) described above, while the amount of increase in ventilation resistance is reduced to about ½, the best embodiment 1 is achieved. It is possible to obtain the intrusion preventing action of the foreign material 10 which is substantially the same as that.

(Best Mode 6)
Next, FIG. 10 shows the configuration of the fan guard of the blower unit according to Embodiment 6 of the present invention.

  In the fan guard 3 of this embodiment, the radial ribs 6, 6... In the configuration of the best embodiment 1 are changed from a curved shape (parabolic shape) to a linear shape, and then the same. It is characterized in that local thick portions 8, 8... Are provided near the center of the annular ribs 7, 7.

  Even with such a configuration, it is possible to realize the intrusion prevention action of the foreign matter 10 exactly the same as that of the first embodiment.

  In this case, of course, the configuration in which the positions of the thick portions 8, 8... Are alternately shifted as shown in FIG. 4, and the thick portions 8 are arranged every other annular rib 7, 7,. , 8..., And a thick portion having a shape as shown in FIGS.

(Other best embodiments)
In each of the above-described best embodiments, a case has been described in which the radial ribs 6, 6... And the annular ribs 7, 7. Is formed by a plurality of vertical ribs (vertical ribs) and a plurality of horizontal ribs (lateral ribs) so that each cell space A, A. The same can be applied to the vicinity of the center of the horizontal rib.

  In this case, the same effects can be achieved by adopting the configurations of the above-described embodiments in exactly the same manner.

It is a front view which shows the whole structure of the fan guard of the ventilation unit which concerns on best Embodiment 1 of this invention. It is an enlarged front view which shows the structure of the principal part (S part of FIG. 1) of the same fan guard. It is an enlarged front view which shows the effect | action of the principal part of the same fan guard. It is an enlarged front view which shows the structure of the principal part of the fan guard which concerns on best Embodiment 2 of this invention. It is an enlarged front view which shows the effect | action of the principal part of the same fan guard. It is an enlarged front view which shows the structure of the principal part of the fan guard which concerns on best Embodiment 3 of this invention. It is an enlarged front view which shows the structure of the principal part of the fan guard which concerns on best Embodiment 4 of this invention. It is an enlarged front view which shows the whole structure of the fan guard which concerns on best Embodiment 5 of this invention. It is an enlarged front view which shows the structure of the principal part (S part of FIG. 8) of the same fan guard. It is an enlarged front view which shows the structure of the principal part of the fan guard which concerns on best Embodiment 6 of this invention. It is a front view which shows the whole structure of the conventional ventilation unit. It is sectional drawing which shows the whole structure of the fan guard of the ventilation unit. It is an enlarged front view of the principal part (S part of FIG. 12) of the fan guard.

Explanation of symbols

  1 is an outdoor unit for an air conditioner, 2 is a main body casing, 3 is a fan guard, 6 is a plurality of radial ribs, 7 is a plurality of annular ribs, 8 is a thick portion, and A is a cell space.

Claims (6)

  It is arranged on the air outlet side of the blower fan, and has an outer frame (4) on the outer periphery, and a predetermined interval in the radial direction between the outer frames (4) around the rotation axis of the blower fan. Are arranged radially concentrically with each other, and radially extending from the vicinity of the center centered on the rotation axis of the blower fan toward the outer frame (4) side. In the fan guard (3) of the blower unit comprising the ribs (6), (6), etc., the annular ribs (7), (7), which form openings (A) that are substantially horizontally long in the circumferential direction. 7) A fan guard for a blower unit, characterized in that local thick portions (8), (8),.   The local thick portions (8), (8), ... are provided only on either the inside or the outside of the annular ribs (7), (7) ... The fan guard of the ventilation unit of 1.   The local thick-walled portions (8), (8)... Are limited to portions where the opening area of the substantially horizontally long opening (A) is larger than a predetermined area. The fan guard of the ventilation unit of 1 or 2.   A fan guard for a blower unit, which is disposed on the air outlet side of the blower fan, has an outer frame (4) on the outer periphery, and includes horizontal ribs and vertical ribs between the outer frames (4). In (3), a fan for a blower unit, characterized in that local thick portions (8), (8),... Are provided in the vicinity of the center of the horizontal rib forming the substantially horizontally long opening (A). guard.   The positions of the thick portions (8), (8),... Are shifted from each other on the upper side and the lower side of the ribs constituting the long side of the substantially horizontally long opening (A). The fan guard of the ventilation unit of Claim 1, 2, 3 or 4.   The fan guard for a blower unit according to claim 1, 2, 3, 4, or 5, wherein a blocking plate (5) is provided at a central portion in the outer frame (4).

Images