Fan cover and air compressor

Abstract

The embodiment of the utility model provides a fan cover and an air compressor, and relates to the technical field of centrifugal fans. The fan cover comprises an air inlet part, an outer contour part and an air outlet part. The air inlet part comprises an air inlet hole; the edge of the air inlet part is connected with the outer contour part. The air outlet part is connected with the air inlet part and the outer contour part. The outline formed by the outer outline part comprises one or more sections of curves; in the first circumferential direction, gaps between the outer contour part and the fan blades are gradually increased; the first circumferential direction is the circumferential direction formed by rotation of the fan blades. Due to the fact that the gaps between the outer contour part and the fan blades are gradually increased, triangular spaces formed between every two adjacent fan blades and the outer contour are gradually increased, the triangular spaces can be gradually increased along with rotation of the fan blades, more spaces are gradually reserved for air inlet, and a smooth air inlet mode is formed.

Description

Technical Field

[0001] This application relates to the field of centrifugal fan technology, and more particularly to fan covers and air compressors. Background Technology

[0002] The air compressor crankcase has a cooling fan on its side. The function of the cooling fan is to provide cooling for the air compressor crankcase and prevent the crankcase temperature from getting too high, which would affect its working performance and service life.

[0003] The original fan cover had an arc-shaped outline, such as... Figure 1 , Figure 1 The central bar represents the centrifugal blades, and the thick solid line represents the outline of the fan shroud. The centrifugal blades can rotate in the direction of the clockwise arrow in the diagram, and the gas is discharged upwards due to centrifugal force. The upward arrow in the diagram approximately indicates the direction of gas discharge. The air intake direction can be perpendicular to the paper, and then the gas is discharged upwards along the vertical outline.

[0004] However, the arc-shaped fan cover has a problem with localized poor air intake.

[0005] How to improve the fan cover to make airflow smooth is the technical problem that this application aims to solve. Utility Model Content

[0006] The purpose of this application is to provide a fan cover and an air compressor to solve the technical problem of poor local air intake in the existing arc-shaped fan cover.

[0007] To achieve the above objectives, one or more embodiments of this application adopt the following technical solutions.

[0008] In a first aspect, embodiments of this application provide a fan shroud for use in a centrifugal fan; the centrifugal fan includes fan blades;

[0009] The fan cover includes an air inlet section, an outer contour section, and an air outlet section;

[0010] The air intake section includes an air intake port;

[0011] The edge of the air intake portion is connected to the outer contour portion, and the air outlet portion is connected to both the air intake portion and the outer contour portion.

[0012] The outline formed by the outer contour portion includes one or more curve segments;

[0013] In the first circumferential direction, the gap between the outer contour portion and the fan blade increases progressively; the first circumferential direction is the circumferential direction formed by the rotation of the fan blade.

[0014] Optionally, the outline formed by the outer contour portion includes an arc segment, the center of which does not coincide with the rotation axis of the fan blade.

[0015] Optionally, the contour formed by the outer contour portion includes an involute.

[0016] The involute rotation direction is the same as the rotation direction of the fan blade configuration in its working state.

[0017] Optionally, the contour formed by the outer contour portion includes sequentially connected arcs and involutes;

[0018] The center of the arc does not coincide with the rotation axis of the fan blade;

[0019] The involute rotation direction is the same as the rotation direction of the fan blade configuration in its working state.

[0020] Optionally, the inner side of the air outlet portion has ribs; the direction of the ribs is for airflow guidance.

[0021] Optionally, the number of ribs is greater than or equal to 2, and the minimum clearance between different ribs and the fan blades is equal.

[0022] Optionally, the air intake is located within a circular area, which is the projection range of the space through which the fan blades rotate in the working state on the air intake section.

[0023] Secondly, embodiments of this application provide an air compressor, the air compressor including a crankcase, fan blades and the fan cover described in the first aspect, the fan blades being located inside the fan cover and the fan cover being located on the side of the crankcase.

[0024] Optionally, the number of fan blades and the number of fan covers are both 2, and they are distributed chirally symmetrically on both sides of the crankcase.

[0025] Optionally, the air intake direction of the fan shroud is configured to be horizontal, the two sides of the air outlet portion connected to the outer contour portion are vertical, and the inner side of the air outlet portion has ribs; the ribs are used for airflow guidance, and the angle between the ribs and the vertical plane is less than 30 degrees.

[0026] Compared with the prior art, this application has the following advantages:

[0027] As the gap between the outer contour and the fan blades increases, the triangular space formed between two adjacent fan blades and the outer contour also increases. This triangular space gradually increases as the fan blades rotate, thus providing more space for air intake and achieving a smooth air intake effect. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic diagram of a fan shroud with a circular outline in the prior art;

[0030] Figure 2 A schematic diagram of a fan cover provided in an embodiment of this application;

[0031] Figure 3 A schematic diagram of a centrifugal fan blade provided in an embodiment of this application;

[0032] Figure 4 A schematic diagram of a centrifugal fan blade located inside a fan shroud, provided as an embodiment of this application;

[0033] Figure 5 This is a schematic diagram of the cross-sectional profile of a fan cover provided in an embodiment of this application, wherein the inner side 5 and the outer side 6 formed by the cross section can both be regarded as the profile formed by the outer profile portion 2;

[0034] Figure 6 A cross-sectional view of a fan blade and fan cover provided for an embodiment of this application;

[0035] Figure 7 A schematic diagram illustrating the outer contour formed by the combination of an arc and an involute curve, provided for an embodiment of this application;

[0036] Figure 8 A schematic diagram of the inner side of a fan cover provided in an embodiment of this application;

[0037] Figure 9 for Figure 8 Another perspective view of the fan shroud and blades shown;

[0038] Figure 10 A schematic diagram showing a pure circular arc as the outer contour provided in an embodiment of this application;

[0039] Figure 11 A schematic diagram showing a semicircle as the outer contour provided in an embodiment of this application;

[0040] Figure 12 A schematic diagram of an air compressor provided in an embodiment of this application;

[0041] Figure 13 A schematic diagram showing a fan shroud that is chirally symmetrically distributed on both sides of a crankcase, according to an embodiment of this application;

[0042] Figure 14 This is a schematic diagram of the cooling gas flow direction of an air compressor provided in an embodiment of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Intake section

[0045] 2. Outer contour section

[0046] 3. Exhaust section

[0047] 4 air intakes

[0048] 5 inner side

[0049] 6 outer side

[0050] 7. Gap between the outer contour and the fan blades

[0051] 8-rib plate

[0052] 9-cylinder block

[0053] 10 Fan Covers

[0054] 11 crankcase

[0055] 12 Crankcase outer end plate Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described in the accompanying drawings can generally be arranged and designed in various different configurations.

[0057] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0058] In the description of this application, it should be noted that:

[0059] Relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations;

[0060] The term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0061] This application provides a fan shroud for a centrifugal fan, the centrifugal fan including fan blades, such as... Figure 2 , Figure 2 A schematic diagram of the fan cover is shown. Figure 3 A schematic diagram of the fan blades is shown. Figure 4 This is a schematic diagram showing the relative positions of the fan cover and fan blades after installation.

[0062] like Figure 2 The fan shroud includes an intake section 1, an outer contour section 2, and an exhaust section 3. The intake section 1 includes an intake port 4 through which air enters. The edge of the intake section 1 connects to the outer contour section 2, which forms a cavity in which the fan blades rotate. The fan blades subject the air to centrifugal force, causing it to be discharged along the exhaust section 3. The exhaust section 3 connects both the intake section 1 and the outer contour section 2, and together they surround the outer periphery of the intake section 1. All connections between the exhaust section 3, the outer contour section 2, and the intake section 1 can be made using smooth curved surfaces.

[0063] The contour formed by the outer contour portion 2 can be a single curve or multiple smoothly connected curves, such as... Figure 5 A cross section of the outer contour portion 2 forms two sides, inner side 5 and outer side 6. When the thickness of the outer contour portion 2 is uniform or negligible, the cross section forms two sides, inner side 5 and outer side 6, with nearly identical shapes. Either side can be regarded as the contour formed by the outer contour portion 2.

[0064] like Figure 6 , Figure 6 This is a cross-sectional view without the air intake portion 1. In the first circumferential direction, the gap 7 between the outer contour portion and the fan blade increases. The first circumferential direction is the circumferential direction formed by the rotation of the fan blade.

[0065] As the gap between the outer contour part 2 and the fan blade increases, the triangular space formed between two adjacent fan blades and the outer contour increases. This triangular space will gradually take in air as the fan blade rotates, and eventually be discharged outward due to the centrifugal force.

[0066] Regarding compared to Figure 1 The effect of the structure: Figure 1 The arc coincides with the axis of rotation of the fan blade. Figure 1 Since the gap between the outer contour portion 2 and the fan blades is not increased progressively, the triangular space formed between two adjacent fan blades and the outer contour will not gradually allow air to enter as the fan blades rotate. Figure 1 There is a problem with poor air intake; this solution is better than... Figure 1 The design allows for smoother air intake.

[0067] The outline formed by the outer contour part 2 can take many forms, for example:

[0068] An arc can serve as the contour formed by the outer contour part 2;

[0069] The involute can also serve as the contour formed by the outer contour portion 2;

[0070] Multiple arc segments can be combined to form the outline of the outer contour part 2;

[0071] Multiple involute segments can also be combined to form the outline of the outer contour part 2;

[0072] The combination of arcs and involutes can also serve as the contour formed by the outer contour part 2.

[0073] Regardless of the type of curve or combination of curves, it is sufficient to satisfy the requirement that the gap 7 between the outer contour part 2 and the fan blade increases in the first circumferential direction.

[0074] like Figure 7 , Figure 7 In the embodiment shown, the outline formed by the outer contour portion 2 includes a circular arc and an involute connected in sequence. In the figure, the section from point A to point B is a circular arc, and the section from point B to point C is an involute. The center of the circular arc does not coincide with the rotation axis of the fan blade, and the rotation direction of the involute is the same as the rotation direction of the fan blade in its working state.

[0075] from Figure 7 From this perspective, the fan blades rotate clockwise during operation, and the airflow direction is upward (e.g.) Figure 7 Here, the upward airflow direction refers to the two vertical sides of the airflow section 3 connected to the outer contour section 2 (therefore, the airflow along the sides is vertically upward). The center of the arc from point A to point B can be located directly to the left of the origin O, or it can be located to the lower left of the origin O. The origin O is the position of the fan blade's rotation axis.

[0076] If from and Figure 7 From a relative perspective, that is, when the fan blades are rotating counterclockwise and the airflow direction is upward, the center of the arc from point A to point B can be located directly to the right of the origin O, or it can be located to the lower right of the origin O.

[0077] Figure 8 Showing with Figure 7 The image shows a relative perspective, revealing the inner side of the fan shroud. The inner side of the air outlet section 3 has ribs 8, designed to align with the airflow direction for guidance. Figure 7 The cross-sectional view also shows the cross-section of rib 8.

[0078] from Figure 7 From the perspective that the fan blades rotate clockwise and the air is discharged upwards, the fan blades discharge the gas from the lower left to the upper right. Therefore, the direction of the rib plate 8 is from the lower left to the upper right.

[0079] from Figure 8 From the perspective that the fan blades rotate counterclockwise and the air outlet direction is upward, the fan blades cause the gas to be discharged from the lower left to the upper right. Therefore, the direction of the rib plate 8 is from the lower right to the upper left.

[0080] Although the direction of the rib plate is at a certain angle to the two vertical sides, this angle of inclination should not be too large, and an acute angle of less than 30 degrees is acceptable.

[0081] In addition, the number of ribs 8 can be set; the number can be one or more. Furthermore, if the number of ribs 8 is greater than one, different sizes of ribs can be set, such as... Figure 8 ,from Figure 8 From the perspective of the fan blades, the left rib is smaller and the right rib is larger. When the fan blades rotate to the ribs, the gap between the ribs and the fan blades is at its smallest. At this point, the distances between the two ribs and the fan blades are almost the same, so the gas can be guided by the right rib during centrifugal discharge. Therefore, it is possible to design different ribs with equal minimum gaps between them and the fan blades. Figure 9 Showing Figure 8 A view of the structure at a certain angle shows that the two ribs are different in size and area.

[0082] Regarding the design of the air intake port of intake section 1, such as Figure 4 The air intake holes can be distributed within a circular area, which is the projection range of the space through which the fan blades rotate in the air intake section. This circular area is eccentric, that is, the center of this circular area does not coincide with the center of the outer contour of the air intake section 1, thereby enabling effective air intake and allowing the gas to enter the triangular space formed between the inner side of the air intake section 1 and the outer contour of the two adjacent fan blades.

[0083] Figure 4 In the illustrated embodiment, the air intake portion 1 can be a flat plate. In another embodiment, the air intake portion 1 can also be a curved surface.

[0084] Figure 4 In the embodiment shown, the outer contour portion is a convex curved surface. In another embodiment, the outer contour portion can also be a flat cylindrical surface.

[0085] Figure 10 An alternative implementation is shown where the outer contour is a flat cylindrical surface, omitting the air intake section 1. (Example) Figure 10The outline formed by the outer contour portion 2 can be a complete arc. From the perspective that the fan blade rotates clockwise and the air outlet direction is upward when it is working, the center O1 is located to the lower left of the fan blade rotation axis. The gap 7 between the outer contour portion 2 and the fan blade increases in the first circumferential direction.

[0086] Figure 11 An implementation of widening the air outlet portion 3 is shown, in which the outline formed by the outer contour portion is a complete arc, and the center O1 is located directly to the left of the fan blade rotation axis. This also satisfies the requirement that the gap 7 between the outer contour portion 2 and the fan blade increases in the first circumferential direction.

[0087] Based on the above embodiments, this application also provides an air compressor, which includes a centrifugal fan. The centrifugal fan includes the aforementioned fan shroud and fan blades, with the fan blades located inside the fan shroud. The fan shroud is located on the side of the crankcase. Figure 12 The air compressor has a crankcase 11, one side of which is a crankcase outer end plate 12, and a fan cover 10 can be installed on the crankcase outer end plate 12.

[0088] like Figure 13 The fan cover 10 and the number of fan blades can be two, and they are distributed chirally symmetrically on both sides of the crankcase. Chirality means that they are symmetrical like the left and right hands of a person. Heat dissipation from both sides helps to increase heat dissipation efficiency and make the heat dissipation of the entire air compressor more even.

[0089] Figure 14 A cross-sectional view is shown, as indicated by the thick arrow in the figure. The intake direction is configured to be horizontal, and the centrifugal exhaust is upward. During the exhaust, the exhaust section can make the gas bend horizontally, and then the gas surrounds the cylinder 9 and is finally discharged upward.

[0090] In general, this application proposes a fan shroud and an air compressor, wherein the fan shroud optimizes the fan intake and exhaust airflow, and further optimizes the cylinder heat dissipation of the air compressor.

[0091] The apparatus and system embodiments described above are merely illustrative. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement these embodiments without any creative effort.

[0092] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can apply this application to the technical scope disclosed herein.

[0093] Any changes or substitutions that can be easily conceived should be included within the scope of protection of this application.

[0094] Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A fan cover, characterized in that, Applied to centrifugal fans; the centrifugal fan includes fan blades; The fan cover includes an air inlet section, an outer contour section, and an air outlet section; The air intake section includes an air intake port; The edge of the air intake portion is connected to the outer contour portion, and the air outlet portion is connected to both the air intake portion and the outer contour portion. The outline formed by the outer contour portion includes one or more curve segments; In the first circumferential direction, the gap between the outer contour portion and the fan blade increases progressively; the first circumferential direction is the circumferential direction formed by the rotation of the fan blade.

2. The fan cover as described in claim 1, characterized in that, The outline formed by the outer contour includes an arc, the center of which does not coincide with the rotation axis of the fan blade.

3. The fan cover as described in claim 1, characterized in that, The outline formed by the outer contour portion includes an involute; The involute rotation direction is the same as the rotation direction of the fan blade configuration in its working state.

4. The fan cover as described in claim 1, characterized in that, The outline formed by the outer contour portion includes sequentially connected arcs and involutes; The center of the arc does not coincide with the rotation axis of the fan blade; The involute rotation direction is the same as the rotation direction of the fan blade configuration in its working state.

5. The fan cover as described in claim 1, characterized in that, The air outlet section has ribs on its inner side; the direction of the ribs is for airflow guidance.

6. The fan cover as described in claim 5, characterized in that, The number of ribs is greater than or equal to 2, and the minimum gap between different ribs and the fan blades is equal.

7. The fan cover as described in claim 1, characterized in that, The air intake is located within a circular area, which is the projection range of the space through which the fan blades rotate in the working state on the air intake section.

8. An air compressor, characterized in that, The air compressor includes a crankcase, fan blades, and a fan shroud as described in any one of claims 1 to 7, wherein the fan blades are located inside the fan shroud, and the fan shroud is located on the side of the crankcase.

9. The air compressor as described in claim 8, characterized in that, The number of fan blades and the number of fan covers are both 2, and they are distributed chirally symmetrically on both sides of the crankcase.

10. The air compressor as described in claim 8, characterized in that, The air intake direction of the fan shroud is configured to be horizontal, and the two sides of the air outlet portion connected to the outer contour portion are vertical. The inner side of the air outlet portion has ribs. The ribs are used for airflow guidance, and the angle between the ribs and the vertical plane is less than 30 degrees.

Images