Fan protection cover and air conditioner outdoor unit

Abstract

The present invention discloses a fan protective cover in the field of ventilation device technology. The fan protective cover comprises a central disc, an outer frame edge, basic ribs and radial ribs. The basic ribs and the outer frame edge are concentric circles with the center point of the central disc as the center. Several concentric annular areas are formed in the outer frame edge. Several curved radial ribs are evenly distributed in each annular area to form a radial rib group. The radial ribs in the same radial rib group have the same shape and size. Several radial rib groups near the outer frame edge are composed of a type of radial ribs. A type of radial ribs satisfies that the shortest distance from any point on the radial rib to the adjacent radial ribs in the same radial rib group does not exceed 5%. Under the premise of ensuring the same safety gap, compared with traditional protective covers, the number and density of radial ribs used can be reduced, thereby increasing the overall effective ventilation area of ​​the protective cover.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilation devices, and in particular to a fan protective cover and an air conditioner outdoor unit comprising the fan protective cover. Background Art

[0002] In the current design of protective covers, the center of the protective cover is usually set at the motor shaft area of ​​the fan system, and the edge of the protective cover is away from the motor shaft area of ​​the fan system. According to the requirements of protective cover safety technology, in order to prevent fingers or other objects from entering the body through the protective cover, the following requirements are made on the mesh size of the protective cover: the mesh formed by the staggered ribs of the protective cover, the mesh gap does not allow a cylinder with a diameter of 12.5mm to pass directly.

[0003] Based on the above requirements and taking into account the strength requirements of the protective cover, there are currently two main design methods. The first is to take the center of the protective cover as the center of the circle, design a dense concentric rib structure, and then use the sparser ribs that radiate from the center to the edge to connect and fix with the dense concentric ribs to form a staggered grid shape; the second is to take the center of the protective cover as the center of the circle, design a dense radiating rib shape extending from the center to the edge; then use the sparser concentric ribs or the sparser radial ribs to interlace with the previous dense radiating ribs to form a grid shape. In both of the above design methods, there is a situation where the distance between adjacent radial ribs changes continuously during the transition of the protective cover grid size from the center to the edge. Specifically, as the adjacent ribs radiate from the center to the outside, the distance between the two gradually increases. Therefore, the effective ventilation area of ​​the protective cover will become smaller in the area close to the center.

[0004] A Chinese invention patent with authorization announcement number CN103900167B and titled "Air outlet protective cover for fan, fan and air conditioner outdoor unit" discloses an air outlet protective cover. In this application, although it is specifically disclosed that different warp strip groups are arranged in different weft circle groups, in the process of the warp strips diffusing from the center to the outside, the adjacent warp strips radiate from the center to the outside, and the shortest distance between the two is still gradually increasing. Therefore, the problem that the effective ventilation area of ​​the protective cover will become smaller in the area close to the center still exists. Summary of the invention

[0005] In order to overcome the problem existing in the existing protective cover grid design that the effective ventilation area of ​​the protective cover becomes smaller as it approaches the center, the present invention provides a fan protective cover.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] The fan protective cover comprises a central disk, an outer frame edge, basic ribs and radial ribs. The basic ribs and the outer frame edge are concentric circles with the center point of the central disk as the center. A number of concentric ring areas are formed in the outer frame edge. A number of curved radial ribs are evenly distributed in each ring area to form a radial rib group. The radial ribs in the same radial rib group have the same shape and size. Several radial rib groups close to the outer frame edge are composed of one type of radial ribs. One type of radial rib satisfies the requirement that the shortest distance from any arbitrary point on the radial rib to the adjacent radial ribs in the same radial rib group does not vary by more than 5%.

[0008] In the present application, the radial ribs in the group of several radial ribs near the edge of the outer frame are a type of radial ribs. For any point on a type of radial rib, the variation range of the shortest distance between adjacent radial ribs in the same group of radial ribs does not exceed 5%. In traditional protective covers, the shortest distance between adjacent radial ribs always gradually increases as it diverges outward along the central disk. In the present application, the variation of the shortest distance between the radial ribs is small. Therefore, under the premise of ensuring the same safety gap, the number and density of radial ribs used can be reduced relative to traditional protective covers, thereby increasing the effective ventilation area of ​​the protective cover as a whole. Based on precision considerations in design and manufacturing, it is preferred to control the variation range of the shortest distance between adjacent radial ribs to not exceed 5%. The distance variation range here is the ratio of the difference between the maximum and minimum values ​​to the minimum value.

[0009] Since the area near the center disk in the fan outlet area is not the main outlet area, a type of radial ribs are arranged in a limited number of circular areas near the edge of the outer frame. A type of radial ribs can be arranged in the area near the center disk, or according to the existing technology, such as the implementation method mentioned in the background technology. No limitation is made here.

[0010] Furthermore, a type of radial rib has one end close to the center of the circle as the starting point and the other end as the end point, the line connecting the starting point and the center of the circle is a radial line, the line connecting the starting point and the end point is an inclined line, the angle between the radial line and the inclined line is α, and a type of radial ribs in different radial rib groups all satisfy the angle α range of 110°-160°.

[0011] In some embodiments, the range of the angle α is adjusted according to different fan characteristics or actual required air outlet angles.

[0012] Furthermore, taking two adjacent radial rib groups in which a type of radial ribs are arranged as a unit, in at least one unit, the inclination line of a type of radial ribs in one of the radial rib groups is 110°-160° in the clockwise direction relative to the radial line, and the inclination line of a type of radial ribs in the other radial rib group is 110°-160° in the counterclockwise direction relative to the radial line.

[0013] In some embodiments, in different radial rib groups of the fan shield, in two adjacent circular ring areas where a type of radial rib is arranged, the angle α between the inclined line and the radial line corresponding to the type of radial rib is in different directions. Specifically, the inclined line of a type of radial rib in one radial rib group is 110°-160° clockwise relative to the radial line, and the inclined line of a type of radial rib in another radial rib group is 110°-160° counterclockwise relative to the radial line. As implemented above, reverse wind is formed in two adjacent circular ring areas, and the reverse winds are mixed with each other to reduce the noise during the operation of the fan.

[0014] Furthermore, in the direction of outward divergence from the center of the circle, the angle α corresponding to a type of radial ribs in different radial rib groups gradually increases.

[0015] In some embodiments, in the direction radiating outward from the center of the circle, in different circular areas, that is, in different radial rib groups, the angle α of a corresponding type of radial ribs gradually increases, reducing interference with the air outlet direction and thereby improving air outlet efficiency.

[0016] Furthermore, in the direction of diverging outward from the center of the circle, the number of one type of radial ribs in different radial rib groups increases.

[0017] In some embodiments, as the area of ​​the circular ring region with the same width increases in the direction of divergence from the center of the circle, the number of radial ribs in the radial rib group increases, which can simultaneously meet the requirements of small change in the shortest distance between the radial ribs and the above-mentioned angle α range, and can also correspond to the strength requirements.

[0018] Furthermore, the lengths of a type of radial rib curves in different radial rib groups are equal or the variation range does not exceed 5%.

[0019] In some embodiments, the curve lengths L corresponding to a type of radial ribs located in different annular areas, i.e., different radial rib groups, are equal or vary by no more than 5%. Based on the two considerations of simplifying the design process and manufacturing accuracy, the preferred curve length L varies by no more than 5%. In view of the fact that the shortest distance between adjacent radial ribs changes very little, at this time, the gaps and lengths between the multiple different grids formed by a type of radial ribs and the basic ribs are basically the same, and the strength of the enclosed area is basically the same. Under the premise of meeting the strength requirements of the protective cover, the basic ribs and radial ribs are more regularly arranged, and the weight of the protective cover can be reduced to the maximum extent, thereby reducing costs.

[0020] An air conditioner outdoor unit is provided, comprising the fan protective cover described in any one of the above embodiments.

[0021] The beneficial effects of the present invention are:

[0022] 1. The shortest spacing between adjacent radial ribs in a type of radial rib remains unchanged or changes very little. On the premise of meeting the safety distance between the ribs, the inclination range of the radial ribs is set, and the air outlet direction of the fan is controlled by setting the inclination angle of the radial ribs. Compared with the existing technology, the number and density of the radial ribs in the radial rib group are reduced, so that the maximum air outlet rate is achieved in the circular area of ​​the layer, thereby increasing the overall effective ventilation area of ​​the fan protective cover and improving the control of the air outlet direction.

[0023] 2. The length of the radial rib curves in different radial rib groups remains equal or changes very little. Combined with the fact that the distance between adjacent radial ribs in the aforementioned radial ribs remains unchanged or changes very little, the sizes of several areas enclosed by the radial ribs and the basic ribs are basically stable. On the premise of meeting the strength requirements of the protective cover, the weight of the protective cover can be reduced to the maximum extent and the cost can be reduced.

[0024] 3. The angles between the inclination lines of a type of radial ribs and the radial lines in different radial rib groups are different. According to the wind characteristics and actual needs of the fans in different areas, such as noise, wind direction, efficiency and other comprehensive indicators, the inclination direction and angle of a type of radial ribs in the specified area can be adjusted to achieve the effect of balancing the comprehensive indicators. The adjustment flexibility is large and it can adapt to different application occasions.

[0025] 4. The number and inclination parameters of a type of radial ribs in different radial rib groups can be different. The parameters of the radial ribs of the protective cover are highly random, which prevents the problem of coupling with the fan, thereby reducing the possibility of noise energy coupling concentration and reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is an overall schematic diagram of the rib layout of the first embodiment of the fan protective cover of the present invention;

[0027] Figure 2 It is an enlarged view of the circular area between the second basic rib and the first basic rib of the fan protective cover embodiment 1 of the present invention;

[0028] Figure 3 It is a partially enlarged schematic diagram of the first embodiment of the fan protective cover of the present invention;

[0029] Figure 4 FIG. a is an overall schematic diagram of the rib layout of the second embodiment of the fan protection cover of the present invention;

[0030] Figure 5 FIG. b is an overall schematic diagram of the rib layout of the second embodiment of the fan protective cover of the present invention;

[0031] Figure 6 This is an overall schematic diagram of the rib layout of the third embodiment of the fan protective cover of the present invention.

[0032] Marked in the figure, 1-center disk, 2-first basic rib, 3-second basic rib, 4-third basic rib, 5-fourth basic rib, 6-outer frame edge, 7-first radial rib group, 8-second radial rib group, 9-third radial rib group, 10-fourth radial rib group, 11-fifth radial rib group, 51-distance control curve area. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings.

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] Embodiment 1:

[0036] like Figure 1-Figure 3 As shown, the present invention provides a fan protective cover, comprising a central disc 1 and a basic rib outer frame 6. In the area enclosed by the central disc 1 and the basic rib outer frame 6, there are also a plurality of circular ribs cocentric with the central disc 1, namely, a first basic rib 2, a second basic rib 3, a third basic rib 4 and a fourth basic rib 5. Five circular ring areas where radial ribs are arranged are formed between the central disc 1, the basic rib outer frame 6 and the plurality of basic ribs. In each circular ring area, a plurality of radial ribs of the same type are evenly distributed to form a radial rib group.

[0037] like Figure 1 As shown, in the circular area enclosed by the central disk 1 and the first basic rib 2, 23 first-class radial ribs are evenly arrayed to form a first radial rib group 7; in the circular area enclosed by the first basic rib 2 and the second basic rib 3, 42 first-class radial ribs are evenly arrayed to form a second radial rib group 8; between the second basic rib 3 and the third basic rib 4, 62 first-class radial ribs are evenly arrayed to form a third radial rib group 9; between the third basic rib 4 and the fourth basic rib 5, 83 first-class radial ribs are evenly arrayed to form a fourth radial rib group 10; between the fourth basic rib 5 and the basic rib outer frame 6, 104 first-class radial ribs are evenly arrayed to form a fifth radial rib group 11.

[0038] In this embodiment, the fan protection cover comprises 4 layers of basic ribs in total. Five annular areas are divided between the 4 layers of basic ribs, the central disk 1 and the outer frame edge 6. A type of radial ribs are arranged in each of the 5 annular areas.

[0039] The number of circular areas and the number of radial ribs of a type in different circular areas, that is, in different radial rib groups, are only presented as specific embodiments and are not limited here. In the implementation process, the overall strength of the fan shield and other design requirements need to be considered and determined comprehensively.

[0040] like Figure 2 As shown, this figure is an enlarged schematic diagram of the area enclosed by the first basic rib 2 and the second basic rib 3. The enclosed area includes the second radial rib group 8. Here, the circular area is taken as an example to show the distance control curve area 51 between adjacent radial ribs in a type of radial ribs.

[0041] like Figure 2 As shown, perpendicular lines are drawn from the radial ribs in the second radial rib group 8 to the adjacent radial ribs, and a distance control curve region 51 is formed between the perpendicular line and the radial ribs. In the distance control curve region 51, the shortest distance between any point on the radial rib and the adjacent radial rib is equal, or changes very little - the change range is within 5%.

[0042] Adjacent radial ribs and basic ribs are enclosed to form a grid, and each grid contains the aforementioned control distance curve area 51. Figure 2 It can be seen that the range control curve area 51 occupies most of the area of ​​the grid.

[0043] Different from the traditional protective cover structure, the present application arranges a type of radial ribs in the annular area, and the shortest distance between adjacent radial ribs in the type of radial ribs remains unchanged or changes very little. Figure 1 It can be seen that the standard of safety distance is mainly achieved by the shortest distance between radial ribs, so the number of basic ribs is relatively small, and the basic ribs have little effect on the overall air outlet area of ​​the fan shield. Therefore, under the premise of ensuring the safety design standard of the shield, since the shortest distance between adjacent radial ribs of the traditional fan shield continues to increase as the center of the circle diverges outward, this application reduces the number and density of radial ribs as much as possible, thereby increasing the effective ventilation area of ​​the shield as a whole.

[0044] In different annular regions, that is, in different radial rib groups, the lengths of the curves corresponding to a type of radial ribs are equal or the variation range does not exceed 5%.

[0045] like Figure 3 As shown, the length of a type of radial rib curve in the first radial rib group 7 is L1, the length of a type of radial rib curve in the second radial rib group 8 is L2, the length of a type of radial rib curve in the third radial rib group 9 is L3, the length of a type of radial rib curve in the fourth radial rib group 10 is L4, and the length of a type of radial rib curve in the fifth radial rib group 11 is L5.

[0046] In this embodiment, preferably, the lengths of a type of radial rib curves in different radial rib groups are equal, or vary very little, that is, the lengths of L1-L5 are equal or vary within 5%.

[0047] As implemented above, the lengths of the radial rib curves of different radial rib groups are equal or vary very little, and the shortest distances between adjacent radial ribs in the above-mentioned radial ribs are equal or vary very little. At this time, a grid is formed between the radial ribs and the basic ribs, and the edge sizes of the grid areas are similar and the areas are basically the same. Therefore, in terms of ensuring the strength of the protective cover, it avoids the ribs being too densely arranged in some areas of the protective cover, resulting in excess strength, thereby maximizing the weight reduction of the protective cover and reducing costs. The regular layout between the radial ribs and the basic ribs can also simplify the production process.

[0048] The line connecting the starting point and the end point of a type of radial rib is an inclined line, the line connecting the center of the circle and the starting point of a type of radial rib is a radial line, and the angle between the inclined line and the radial line is α. Figure 3 As shown, the angle between the inclined line and the radial line corresponding to a type of radial rib in the first radial rib group 7 is α1, the angle between the inclined line and the radial line corresponding to a type of radial rib in the second radial rib group 8 is α2, the angle between the inclined line and the radial line corresponding to a type of radial rib in the third radial rib group 9 is α3, the angle between the inclined line and the radial line corresponding to a type of radial rib in the fourth radial rib group 10 is α4, and the angle between the inclined line and the radial line corresponding to a type of radial rib in the fifth radial rib group 11 is α5.

[0049] from Figure 3 It can be seen that in this embodiment, preferably, α1<α2<α3<α4<α5. The angles of α1, α2, α3, α4, and α5 are all between 110° and 160°, which conforms to the law of wind direction change of the fan and reduces noise.

[0050] In this embodiment, preferably, the number of radial ribs of a type in different radial rib groups increases in the direction of divergence from the center of the circle. Specifically, the number of radial ribs of a type corresponding to the radial rib group of the outer layer is higher than the number of radial ribs of a type corresponding to the radial rib group of the inner layer. This is mainly because, as the circle diverges outward, the area of ​​the annular region becomes larger, and the increase in the number of radial ribs makes it easier to meet the requirements of the strength and angle α of the protective cover.

[0051] Embodiment 2:

[0052] like Figure 4 As shown, the present invention provides a fan protective cover. The main difference between this embodiment and the first embodiment is that the radial lines and the angles α of the inclined lines corresponding to a type of radial ribs in different radial rib groups are different.

[0053] Specifically, the inclined lines corresponding to the radial ribs in the first radial rib group 7 are 110°-160° counterclockwise relative to the radial line, and the inclined lines corresponding to the radial ribs in other radial rib groups are 110°-160° clockwise relative to the radial line.

[0054] As implemented above, the two adjacent circular areas where the first radial rib group 7 and the second radial rib group 8 are located form reverse winds when the fan is running, and the reverse winds blend with each other to reduce the noise during the operation of the fan.

[0055] Alternatively, radial ribs with different angles between radial lines and inclined lines may be provided in other annular regions, such as Figure 5 As shown, the angle direction of the inclined line and radial line corresponding to one type of radial ribs in the first radial rib group 7 and the fifth radial rib group 11 is different from that of other radial rib groups. In specific implementation, the angle direction and angle of the inclined line and radial line corresponding to the radial ribs can be determined according to actual needs. No limitation is made here.

[0056] Embodiment three:

[0057] like Figure 6 As shown, the present invention provides a fan protection cover. The main difference between this embodiment and the above-mentioned embodiment is that not every circular area is provided with a type of radial ribs.

[0058] In this embodiment, a central disk 1 and a basic rib outer frame 6 are included. In the area enclosed by the central disk 1 and the basic rib outer frame 6, a plurality of circular ribs cocentric with the central disk 1 are included, namely, a first basic rib 2, a second basic rib 3 and a third basic rib 4. A concentric ring area is formed between the central disk 1, the basic rib outer frame 6 and the plurality of basic ribs.

[0059] In this embodiment, the radial rib group directly connected to the central disk 1, that is, the first radial rib group 7 is not composed of one type of radial ribs. This is mainly because the area close to the central disk 1 is not the main air outlet area. Therefore, in the implementation process, based on the air outlet area, the area may not be limited to implementing one type of auxiliary ribs. Other needs may be met first, for example, for a better appearance effect as implemented in this embodiment. Obviously, it is also possible for the first radial rib group 7 here to be composed of one type of radial ribs.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fan protection cover, comprising a central disk (1), an outer frame edge (6), basic ribs and radial ribs, wherein the basic ribs and the outer frame edge (6) are concentric circles with the center point of the central disk (1) as the center, and a plurality of concentric circular ring areas are formed inside the outer frame edge (6), and a plurality of curved radial ribs are evenly distributed in each circular ring area to form a radial rib group, and the radial ribs in the same radial rib group have the same shape and size, and are characterized by: The plurality of radial rib groups near the outer frame edge (6) are composed of a type of radial ribs, wherein the radial ribs of the type satisfy that the variation range of the shortest distance from any point on the radial rib to the adjacent radial rib in the same radial rib group does not exceed 5%; One end of a type of radial rib close to the center of the circle is the starting point, and the other end is the end point. The line connecting the starting point and the center of the circle is a radial line, and the line connecting the starting point and the end point is an inclined line. The angle between the radial line and the inclined line is α. The radial ribs of a type of radial ribs in different radial rib groups all meet the angle α range of 110°-160°. In the direction of outward divergence from the center of the circle, the number of one type of radial ribs in different radial rib groups increases.

2. The fan protective cover according to claim 1, characterized in that: Taking two adjacent radial rib groups in which the same type of radial ribs are arranged as a unit, in at least one unit, the inclination line of the same type of radial ribs in one of the radial rib groups is 110°-160° in the clockwise direction relative to the radial line, and the inclination line of the same type of radial ribs in the other radial rib group is 110°-160° in the counterclockwise direction relative to the radial line.

3. The fan protective cover according to claim 1, characterized in that: In the direction of outward divergence from the center of the circle, the corresponding angle α of a type of radial ribs in different radial rib groups gradually increases.

4. The fan protective cover according to any one of claims 1 to 3, characterized in that: The lengths of a type of radial rib curves in different radial rib groups are equal or the variation range does not exceed 5%.

5. An air conditioner outdoor unit, characterized in that: The invention comprises the fan protective cover as described in any one of claims 1 to 4.

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