Anti-blocking fan and inverter

Abstract

The utility model discloses an anti-blocking fan and an inverter, the anti-blocking fan comprises a plurality of fan blades and a housing, and the plurality of fan blades are arranged in the housing along the circumference; along the rotation direction of the fan blades, anti-blocking areas with gradually increased intervals are formed between the outer edges of the fan blades and the inner wall of the shell. The inverter comprises the anti-blocking fan. The fan has the beneficial effects that compared with a traditional uniform gap between the fan blades and the inner wall of the shell, the gap between the fan blades and the inner wall of the shell is gradually increased in the rotating direction of the fan blades, and therefore when foreign matter such as gravels enters the fan, the foreign matter such as the gravels can automatically fall off along with the gradual increase of the gap; therefore, the fan is prevented from being stuck, and the use safety of the fan can be effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of air cooling and heat dissipation, and in particular to an anti-blocking fan and inverter. Background Art

[0002] For electrical equipment, such as inverters and power distribution cabinets, it is often necessary to install a heat dissipation device on the side of the equipment to facilitate heat dissipation of the electrical equipment. The most commonly used heat dissipation device is an air-cooled heat dissipation device, that is, one or more cooling fans are installed on the side of the equipment to dissipate heat.

[0003] like Figure 1 FIG. 1 is a schematic diagram of the structure of an existing cooling fan; as can be seen from the figure, the gap between the inner wall 101 of the fan housing 100 and the outer edge 201 of the fan blade 200 is substantially equal. For electrical equipment installed in the external environment, when foreign objects such as gravel fall into the gap, the entire impeller may be stuck by the foreign objects such as gravel, thereby making the fan unable to work normally. Therefore, it is urgent to improve the existing cooling fan. Utility Model Content

[0004] One of the purposes of the present application is to provide an anti-blocking fan that can solve at least one defect in the above-mentioned background technology.

[0005] Another object of the present application is to provide an inverter including the aforementioned anti-blocking fan.

[0006] In order to achieve at least one of the above-mentioned purposes, the technical solution adopted in the present application is: a blocking-proof fan, comprising a plurality of blades and a shell, wherein the plurality of blades are arranged circumferentially and installed in the shell; along the rotation direction of the blades, an anti-blocking zone with a gradually increasing spacing is formed between the outer edge of the blade and the inner wall of the shell.

[0007] Preferably, the inner wall of the outer shell is circular, and an anti-blocking section is provided on the outer edge of the fan blade; along the rotation direction of the fan blade, the anti-blocking area is formed between the anti-blocking section and the inner wall of the outer shell.

[0008] Preferably, the anti-blocking section is arranged on the entire outer edge.

[0009] Preferably, the anti-blocking section is arranged on a portion of the outer edge, and the anti-blocking section is located on a side of the outer edge close to the rotation direction of the fan blade.

[0010] Preferably, the anti-blocking section is a single-section structure.

[0011] Preferably, the anti-blocking section is a multi-section structure.

[0012] Preferably, the anti-blocking section adopts an involute structure.

[0013] Preferably, the anti-blocking section adopts a diagonal structure.

[0014] Preferably, the maximum difference in distance from each point on the anti-blocking section to the corresponding inner edge is X, and the value of X is 1-5 mm.

[0015] Preferably, the inner wall of the shell is provided with a plurality of anti-blocking sections along the circumferential direction, and along the rotation direction of the fan blade, an anti-blocking zone with a gradually increasing spacing is formed between the anti-blocking sections and the outer edge of the fan blade.

[0016] An inverter comprises an air cooling device, wherein the air cooling device adopts the anti-blocking fan mentioned above.

[0017] Compared with the prior art, the beneficial effects of this application are:

[0018] Compared with the uniform gap between traditional fan blades and the inner wall of the outer shell, the present application gradually increases the gap between the fan blades and the inner wall of the outer shell along the direction of rotation of the fan blades. When foreign objects such as gravel enter the fan, the gravel and other foreign objects can fall out by themselves as the gap gradually increases, thereby preventing the fan from being stuck, and effectively improving the safety of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an existing cooling fan.

[0020] Figure 2 It is a structural schematic diagram of the utility model.

[0021] Figure 3 This is a schematic diagram of the outer edge structure of a fan blade in one example of the present invention.

[0022] Figure 4 This is a schematic diagram of the outer edge structure of another example of a fan blade in the utility model.

[0023] Figure 5 The figure is a schematic diagram of the outer edge structure of another example of a fan blade in the present invention.

[0024] In the figure: an outer shell 100 , an inner wall 101 , a fan blade 200 , an outer edge 201 , an anti-blocking section 202 , and an anti-blocking area 300 . DETAILED DESCRIPTION

[0025] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0026] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0027] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0028] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0029] One aspect of the present application provides an anti-blocking fan, such as Figure 2 As shown, one of the preferred embodiments includes a plurality of blades 200 and a housing 100. A mounting cavity is provided at the center of the housing 100, and the plurality of blades 200 can be arranged in a circumferential manner to form an impeller and installed in the mounting cavity of the housing 100. Along the rotation direction of the blades 200, an anti-blocking zone 300 with a gradually increasing spacing can be formed between the outer edge 201 of the blades 200 and the inner wall 101 of the mounting cavity, and when foreign matter such as gravel enters between the blades 200 and the inner wall 101 of the mounting cavity, as the spacing of the anti-blocking zone 300 gradually increases, the foreign matter such as gravel can fall by itself under the action of gravity, thereby effectively ensuring the safety of the fan.

[0030] It is understandable that the installation cavity of the conventional housing 100 is circular, that is, the inner wall 101 is a smooth circular structure as a whole; at the same time, the distances from each point on the outer edge 201 of the fan blade 200 to the impeller axis are the same, that is, when the fan blade 200 rotates, the spacings from the outer edge 201 of the fan blade 200 to the inner wall 101 of the installation cavity are equal. Therefore, when foreign matter such as gravel is stuck between the outer edge 201 of the fan blade 200 and the inner wall 101 of the installation cavity, the size and direction of the squeezing force of the outer edge 201 of the fan blade 200 or the inner wall 101 of the installation cavity on the gravel are constant along the rotation direction of the fan blade 200, and then the fan blade 200 cannot break through the resistance generated by the stuck foreign matter such as gravel under the driving force of the motor, causing the fan blade 200 to be unable to rotate, which may eventually cause the motor to be overloaded and damaged.

[0031] In this embodiment, an anti-blocking zone 300 with a gradually increasing spacing along the rotation direction of the blade 200 can be formed between the outer edge 201 of the blade 200 and the inner wall 101 of the installation cavity. Therefore, when foreign objects such as gravel are stuck in the anti-blocking zone 300, since the spacing of the anti-blocking zone 300 is gradually increasing along the rotation direction of the blade 200, that is, toward the rotation direction of the blade 200, the anti-blocking zone 300 is in a trend of increasing spacing; and then the rotation resistance of the gravel and other foreign objects to the blade 200 due to the extrusion of the anti-blocking zone 300 keeps a decreasing trend along the rotation direction of the blade 200, so that the blade 200 can easily break through the resistance of the gravel and other foreign objects, so that the spacing of the anti-blocking zone 300 at the corresponding position of the gravel and other foreign objects is greater than the shape and size of the gravel and other foreign objects, so that the gravel and other foreign objects can be separated from the fan under their own gravity or the impact of the blade 200 to ensure the safety of the fan.

[0032] It should be known that setting the anti-blocking zone 300 with gradually changing spacing can ensure that the fan blade 200 has the largest working area, and thus can generate the maximum air volume while meeting the anti-blocking requirement. If the overall length of the fan blade 200 is directly shortened, although anti-blocking can also be achieved, compared with the method of setting the anti-blocking zone 300 with gradually changing spacing in this embodiment, the working area of ​​the impeller is excessively reduced, and thus the generated air volume is also excessively reduced to affect the overall cooling effect of the fan.

[0033] In this embodiment, the anti-blocking area 300 can be formed in the following two ways.

[0034] The first type: Figures 2 to 5As shown, the inner wall 101 of the installation cavity provided at the center of the housing 100 is circular, and the outer edge 201 of the fan blade 200 is provided with an anti-blocking section 202. Along the rotation direction of the fan blade 200, an anti-blocking zone 300 with a gradually increasing spacing can be formed between the anti-blocking section 202 and the inner wall 101 of the installation cavity. Specifically, the vertical distance from each point of the anti-blocking section 202 to the impeller axis along the extension direction is gradually changed, and then the anti-blocking section 202 can be deformed along the inner wall 101 of the installation cavity along the rotation direction of the fan blade 200 to form an anti-blocking zone 300 with a gradually increasing spacing.

[0035] The second type: the inner wall 101 of the installation cavity set in the center of the housing 100 is provided with a plurality of anti-blocking sections 202 along the circumferential direction, and along the rotation direction of the blade 200, an anti-blocking area 300 with a gradually increasing spacing can be formed between the anti-blocking section 202 and the outer edge 201 of the blade 200. Specifically, the vertical distance from each point of the anti-blocking section 202 to the impeller axis along the extension direction is gradually changed, and then the anti-blocking section 202 can be deformed along the outer edge 201 of the blade 200 along the rotation direction of the blade 200 to form an anti-blocking area 300 with a gradually increasing spacing.

[0036] It can be understood that both of the above-mentioned two forming methods can meet the needs of this embodiment. For the above-mentioned two forming methods, the anti-blocking section 202 can be integrally formed with the fan blade 200 or the outer shell 100. However, for the above-mentioned first forming method, the anti-blocking section 202 is formed at the outer edge 201 of the fan blade 200, and the molding and demolding are relatively convenient; and for the above-mentioned second forming method, the anti-blocking section 202 is formed in a concave manner on the inner wall 101 of the installation cavity, which makes the molding and demolding of the outer shell 100 more complicated; therefore, in this embodiment, the above-mentioned first forming method is preferably used for the formation of the anti-blocking area 300.

[0037] In this embodiment, Figure 3 and Figure 4 As shown, there are many specific structures of the anti-blocking segment 202, such as the anti-blocking segment 202 can adopt an involute structure and an oblique structure. It should be known that under the same structural size of the blade 200, the anti-blocking segment 202 with an involute structure has less impact on the working area of ​​the blade 200 than the anti-blocking segment 202 with an oblique structure. That is, the working area of ​​the blade 200 corresponding to the anti-blocking segment 202 with an involute structure is larger than the working area of ​​the blade 200 corresponding to the anti-blocking segment 202 with an oblique structure; therefore, in this embodiment, the anti-blocking segment 202 can preferably adopt an involute structure. Of course, the specific structure of the anti-blocking segment 202 includes but is not limited to an involute structure and an oblique structure, and it only needs to meet the above-mentioned requirements for forming the anti-blocking area 300.

[0038] In this embodiment, the maximum difference in distance from each point on the anti-blocking section 202 to the corresponding inner edge is X, and the value of X is 1-5 mm.

[0039] It is understandable that the value of X is determined based on the size of foreign matter such as gravel that can enter the fan and may get stuck in the fan's operating environment. For example, if the size of foreign matter such as gravel is 2mm, then the minimum spacing between the outer edge 201 and the inner wall 101 of the installation cavity when the fan blade 200 can rotate without interference can be set to a, and the value of a can be assumed to be 1mm; then the value of X can be 2mm. That is, the minimum spacing value of the anti-blocking zone 300 is a=1mm, and the maximum spacing value is a+X=3mm. As a result, foreign matter such as gravel may get stuck in the middle position of the anti-blocking section 202, and as the fan blade 200 rotates, the spacing of the anti-blocking zone 300 corresponding to the gravel and other foreign matter will be greater than 2mm, and then the gravel and other foreign matter can be separated from the fan under gravity or the impact of the fan blade 200 to achieve anti-blocking.

[0040] It should be noted that the value of X should not be too small. A too small X means that the spacing of the anti-blocking area 300 is also small, and thus anti-blocking may not be possible or difficult to achieve. The value of X should not be too large. A too large X means that the working area of ​​the fan blade 200 is excessively reduced, which will affect the cooling performance of the fan.

[0041] In this embodiment, the anti-blocking section 202 may be a single-section structure or a multi-section structure. For ease of understanding, a detailed description is given below.

[0042] 1. For the single-stage anti-blocking section 202, there are two specific configuration methods for the anti-blocking section 202, which can be described below through specific examples.

[0043] Example 1: Figure 3 and Figure 4 As shown, the anti-blocking section 202 is arranged on the entire outer edge 201 , that is, the maximum spacing and the minimum spacing of the anti-blocking area 300 are located at the two ends of the extension direction of the outer edge 201 .

[0044] Example 2: The anti-blocking section 202 is arranged on part of the outer edge 201, and the anti-blocking section 202 is located on the side of the outer edge 201 close to the rotation direction of the fan blade 200 to ensure that when the fan blade 200 rotates, the anti-blocking area 300 can first correspond to foreign objects such as gravel.

[0045] It can be understood that, for Example 2, the distances from each point in the area on the outer edge 201 where the anti-blocking section 202 is not provided to the impeller axis are equal, and the value of the distance can be equal to the maximum distance from the anti-blocking section 202 to the impeller axis, and thus the fan blade 200 corresponding to Example 2 has a larger working area than the fan blade 200 corresponding to Example 1; and the structure of the fan blade 200 corresponding to Example 1 is more regular than the structure of the fan blade 200 corresponding to Example 2, and can be conveniently molded. Therefore, for the above two examples, technicians in this field can make their own choices according to actual needs.

[0046] 2. For the multi-stage anti-blocking section 202, there are two main specific configuration methods for the anti-blocking section 202, which can be described below through specific examples.

[0047] Example 1: Figure 5 As shown, the anti-blocking section 202 is arranged on the entire outer edge 201, that is, multiple anti-blocking sections 202 are continuously and adjacently arranged.

[0048] Example 2: The anti-blocking section 202 is arranged on part of the outer edge 201; it can be multiple continuous anti-blocking sections 202 arranged on the side of the outer edge 201 close to the rotation direction of the fan blade 200 to ensure that when the fan blade 200 rotates, the anti-blocking area 300 can first correspond to foreign matter such as gravel; it can also be multiple anti-blocking sections 202 arranged at intervals along the extension direction of the outer edge 201.

[0049] It is understandable that both of the above two examples can meet the needs of this application. Compared with example 2, example 1 is more convenient to mold and process, so in this embodiment, example 1 is preferably used for the multi-stage anti-blocking section 202. For ease of understanding, a specific example can be used to illustrate.

[0050] Specifically, Figure 5 As shown, the anti-blocking section 202 has two sections, and the two anti-blocking sections 202 are symmetrically arranged along the midpoint of the outer edge 201 in the extension direction of the fan blade 200. Therefore, the fan blade 200 can form an anti-blocking area 300 that can achieve anti-blocking regardless of forward or reverse rotation.

[0051] It is understandable that the air-cooling fan not only has the requirement of forward rotation for cooling, but also the requirement of reverse rotation for dust removal. In both the forward and reverse rotation modes of the cooling fan, foreign objects such as gravel may get stuck. Therefore, in this example, anti-blocking areas 300 corresponding to forward rotation and reverse rotation are formed on both sides of the fan blades 200, thereby preventing blockage in both the forward and reverse rotations of the fan.

[0052] It should be noted that the Figures 3 to 5 The direction indicated by the thick solid arrow is the rotation direction of the fan blade 200 .

[0053] Another aspect of the present application provides an inverter, the inverter includes an air cooling device, and the air cooling device uses the above-mentioned anti-blocking fan to dissipate heat and cool the inverter.

[0054] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. An anti-blocking fan, characterized in that: It comprises a plurality of fan blades and a shell, wherein the plurality of fan blades are arranged along a circumference and installed in the shell; along the rotation direction of the fan blades, an anti-blocking zone with a gradually increasing spacing is formed between the outer edge of the fan blade and the inner wall of the shell.

2. The anti-blocking fan according to claim 1, characterized in that: The inner wall of the outer shell is circular, and an anti-blocking section is arranged on the outer edge of the fan blade; along the rotation direction of the fan blade, the anti-blocking area is formed between the anti-blocking section and the inner wall of the outer shell.

3. The anti-blocking fan according to claim 2, characterized in that: The anti-blocking section is arranged on the entire outer edge.

4. The anti-blocking fan according to claim 2, characterized in that: The anti-blocking section is arranged on a portion of the outer edge, and the anti-blocking section is located on a side of the outer edge close to the rotation direction of the fan blade.

5. The anti-blocking fan according to claim 3 or 4, characterized in that: The anti-blocking section is a single-section structure.

6. The anti-blocking fan according to claim 3 or 4, characterized in that: The anti-blocking section is a multi-section structure.

7. The anti-blocking fan according to claim 2, characterized in that: The anti-blocking section adopts an involute structure.

8. The anti-blocking fan according to claim 2, characterized in that: The anti-blocking section adopts an oblique line structure.

9. The anti-blocking fan according to claim 1, characterized in that: The inner wall of the shell is provided with a plurality of anti-blocking sections along the circumferential direction; along the rotation direction of the fan blade, an anti-blocking zone with a gradually increasing spacing is formed between the anti-blocking sections and the outer edge of the fan blade.

10. An inverter, characterized in that: It comprises an air cooling device, and the air cooling device adopts the anti-blocking fan described in any one of claims 1-9.

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