Fan cover, vehicle-mounted refrigerator and vehicle

Abstract

The utility model discloses a fan cover, a vehicle-mounted refrigerator and a vehicle, the fan cover comprises a first cover plate, a second cover plate, a fan and a flow guide rib, and the first cover plate and the second cover plate are oppositely arranged at an interval; the fan comprises an impeller, the impeller is arranged between the first cover plate and the second cover plate, the impeller comprises a plurality of blades which are sequentially arranged in the circumferential direction of the center shaft, and the ends, away from the center shaft, of the blades are first ends; the flow guide rib is connected with the first cover plate and the second cover plate and located on the periphery of the fan, and the end, close to the fan, of the flow guide rib is a second end; in the rotating process of the impeller, an included angle A is formed between the tangent line of the first end and the tangent line of the second end which are closest to each other, and the included angle A is larger than or equal to 65 degrees and smaller than or equal to 120 degrees, so that air in the containing cavity of the refrigerator body of the vehicle-mounted refrigerator can be driven by the fan cover to be fully mixed, and the heat exchange effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle-mounted refrigerators, and in particular to a fan cover, a vehicle-mounted refrigerator and a vehicle. Background Art

[0002] Car refrigerators are mainly used to refrigerate food and drinks, keep them fresh and taste good, and provide passengers with delicious food and cool and refreshing drinks at any time. They can greatly improve the travel experience and are important devices for improving driving comfort. At present, the mainstream heat exchange method of car refrigerators is to use a compressor, which uses the phase change of liquid medium in the heat exchanger to take away the heat from the box, thereby achieving a heat exchange effect.

[0003] Due to the small size of the car refrigerator, the air inside the box cannot be fully mixed, affecting the heat exchange effect. Utility Model Content

[0004] The utility model aims to provide a fan cover, a vehicle refrigerator and a vehicle, so as to solve the problem that the air mixing convection in the box of the vehicle refrigerator is insufficient, thus affecting the heat exchange effect.

[0005] In order to achieve the purpose of the utility model, the utility model provides the following technical solutions:

[0006] In a first aspect, the utility model provides a fan cover, comprising:

[0007] first cover plate;

[0008] a second cover plate, opposite to and spaced from the first cover plate;

[0009] A fan, comprising an impeller, the impeller being arranged between the first cover plate and the second cover plate, the impeller comprising a plurality of blades arranged in sequence in a circumferential direction around a central axis, and an end of the blade away from the central axis being a first end;

[0010] A guide rib, connecting the first cover plate and the second cover plate and located at the periphery of the fan, wherein the end of the guide rib close to the fan is a second end;

[0011] Wherein, during the rotation of the impeller, the tangent line of the first end closest to the second end has an angle A that satisfies: 65°≤A≤120°.

[0012] In one embodiment, during the rotation of the impeller, the first end and the second end closest to each other have a distance d that satisfies: 3mm≤d≤Da / 2, where Da is the diameter of the impeller.

[0013] In one embodiment, along the rotation direction of the impeller, the blades are in an arc shape convex from the rear to the front.

[0014] In one embodiment, the guide rib extends along a straight line.

[0015] In one embodiment, the guide rib further includes a third end opposite to the second end, a straight line passing through the central axis and the second end is a reference line, and the third end is located in front of the reference line in the rotation direction of the impeller.

[0016] In one embodiment, there are a plurality of guide ribs, and the plurality of guide ribs are arranged at intervals on the outer circumference of the fan.

[0017] In one embodiment, the second ends of the plurality of guide ribs form a circle concentric with the impeller.

[0018] In one embodiment, the first cover plate is provided with an air inlet, one axial end of the impeller corresponds to the air inlet, the first cover plate, the second cover plate and the guide ribs together form an air duct, the edges surrounding the first cover plate and the second cover plate form an air outlet, and the air duct is connected to the air inlet and the air outlet.

[0019] In one embodiment, the air inlet and the air outlet are both facing the side of the first cover plate facing away from the second cover plate.

[0020] In one embodiment, the air duct includes a closing section, which is close to the air outlet. In a direction from the air inlet to the air outlet, a distance between the first cover plate and the second cover plate at the closing section gradually decreases.

[0021] In one embodiment, the first cover plate includes a first substrate, a connecting plate and a first edge plate, the first substrate is provided with the air inlet, the connecting plate is connected to the outer peripheral edge of the first substrate, the first edge plate is connected to the outer peripheral edge of the connecting plate, the second cover plate includes a second substrate and a second edge plate, the second edge plate is connected to the four peripheral edges of the second substrate, the four peripheral edges of the first edge plate and the four peripheral edges of the second edge plate form the air outlet, the connecting plate has an inclined angle with the first substrate, and the space between the connecting plate and the second substrate forms the closing section.

[0022] In one embodiment, the guide rib and the first cover plate and / or the second cover plate are an integrated structure.

[0023] In the second aspect, the utility model also provides a vehicle-mounted refrigerator, comprising a box body, a heat exchanger and a fan cover described in any one of the various embodiments of the first aspect, wherein the box body has a accommodating cavity with one end open, the heat exchanger is arranged on the outer surface of the box body, and the fan cover is arranged at the opening of the box body to close the accommodating cavity.

[0024] In a third aspect, the utility model further provides a vehicle, comprising a vehicle body and the vehicle refrigerator as described in the second aspect, wherein the vehicle refrigerator is arranged on the vehicle body.

[0025] The fan cover provided by the utility model is provided with a first cover plate, a second cover plate, a fan and guide ribs, and during the rotation of the impeller, the tangent of the first end closest to the tangent of the second end has an angle A that satisfies: 65°≤A≤120°, so that the air in the accommodating cavity of the car refrigerator body can be driven by the fan cover to be fully mixed, thereby improving the heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 is an exploded view of a vehicle refrigerator according to an embodiment;

[0028] Figure 2 is an exploded view of a fan cover of an embodiment;

[0029] Figure 3 is a three-dimensional diagram of a fan cover with the second cover plate omitted in one embodiment;

[0030] Figure 4 is a front view of a fan cover of an embodiment;

[0031] Figure 5 yes Figure 4 A cross-sectional view along the EE direction;

[0032] Figure 6 yes Figure 5 A cross-sectional view along the FF direction;

[0033] Figure 7 The present invention is a bottom view of a fan cover of an embodiment.

[0034] Description of reference numerals:

[0035] 100-Car refrigerator;

[0036] 10-box, 11-accommodating chamber;

[0037] 20-fan cover, 21-first cover plate, 211-first substrate, 212-connecting plate, 213-first edge plate, 22-second cover plate, 221-second substrate, 222-second edge plate, 223-mounting hole, 224-mounting portion, 23-fan, 231-connecting bowl, 2311-bottom plate, 2312-enclosing plate, 232-blade, 2321-first end, 233-connecting ring, 234-motor, 235-support, 2351-disk body, 2352-connecting portion, 24-guiding rib, 241-second end, 242-third end, 251-air inlet, 252-air outlet, 26-air duct, 261-closing section;

[0038] 30-top cover;

[0039] 40 - heat exchanger, 41 - heat exchange tube, 42 - header, 43 - main water inlet, 44 - main water outlet. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0042] Unless otherwise defined, all technical and scientific terms used in this utility model have the same meaning as those commonly understood by technicians in the technical field of this utility model. The terms used in the specification of this utility model are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used in this utility model includes any and all combinations of one or more related listed items.

[0043] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0044] Please refer to Figure 1 The embodiment of the utility model provides a vehicle refrigerator 100, comprising a box body 10, a heat exchanger 40 and a fan cover 20 in any embodiment of the utility model.

[0045] The box body 10 has a accommodating chamber 11 with an opening at one end. The outer shape of the box body 10 can be roughly cylindrical, rectangular, etc., without limitation. The box body 10 is a thin-walled structure, and can be made of a material with good thermal conductivity, such as aluminum alloy, iron alloy, etc. The box body 10 is open at the top, and the box body 10 has no openings at other positions except the position of the opening. The accommodating chamber 11 is used to store food, drinks, etc., and food and drinks can be put into the accommodating chamber 11 through the opening of the box body 10, and food and drinks can also be taken out of the accommodating chamber 11 through the opening of the box body 10. The accommodating chamber 11 has a bottom wall and surrounding side walls, the bottom wall is opposite to the opening of the box body 10, and the surrounding side walls are connected between the bottom wall and the opening. The box body 10 can be an integrated structure stamped from a whole large plate, or a structure spliced ​​from multiple thin plates, or a structure formed by any other method, without limitation.

[0046] The heat exchanger 40 is disposed on the outer surface of the housing 10. The heat exchanger 40 may include a heat exchange tube 41, which is attached to the outer surface of the housing 10. For example, the top of the housing 10 is open, and the heat exchange tube 41 may be attached to at least one surface of the four sides of the housing 10. Further, the heat exchange tube 41 may surround the four sides of the housing 10. The heat exchange tube 41 has a water inlet and a water outlet, and a refrigerant or a heat medium may be introduced into the water inlet. The refrigerant or the heat medium flows in the heat exchange tube 41, so that the heat exchange tube 41 exchanges heat with the housing 10, and then the refrigerant or the heat medium flows out from the water outlet. The heat exchange tube 41 of the heat exchanger 40 may be multiple and distributed all around the four sides of the housing 10.

[0047] Optionally, the heat exchanger 40 further includes a header 42, which is connected to the plurality of heat exchange tubes 41, and a total water inlet 43 and a total water outlet 44 may be provided on the header 42. Specifically, the header 42 may include two, one of which is provided with a total water inlet 43, and the other is provided with a total water outlet 44. The refrigerant or heat medium enters one of the headers 42 from the total water inlet 43 and is distributed to each heat exchange tube 41, and then flows out from each heat exchange tube 41 to the other header 42, and then flows out from the total water outlet 44.

[0048] The vehicle refrigerator 100 may also include a pump (not shown), a compressor (not shown), etc. The pump is used to drive the refrigerant or the heat medium to flow in the heat exchange tube 41, and the compressor is used to cool down the heated refrigerant flowing out of the water outlet or to heat up the cooled heat medium and re-input it into the water inlet. The refrigerant or the heat medium may be water or other fluid medium for heat exchange, without limitation.

[0049] The fan cover 20 is disposed at the opening of the box body 10 to close the accommodating chamber 11. The fan cover 20 can be slidably connected or rotatably connected to the box body 10, or the fan cover 20 can be separated from the box body 10 to expose the accommodating chamber 11, so that food and drinks can be added or taken out of the accommodating chamber 11. When the fan cover 20 is disposed at the opening of the box body 10, the accommodating chamber 11 is closed to prevent convection between the air in the accommodating chamber 11 and the outside air. In this state, the heat exchanger 40 works to exchange heat with the food and drinks in the accommodating chamber 11.

[0050] Optionally, the fan cover 20 is directly connected to the box body 10 .

[0051] Alternatively, the vehicle refrigerator 100 further includes a top cover 30 , the fan cover 20 is connected to the top cover 30 , and the top cover 30 is connected to the box body 10 and closes the opening of the accommodating cavity 11 , that is, the fan cover 20 is indirectly connected to the box body 10 through the top cover 30 .

[0052] The vehicle refrigerator 100 of the embodiment of the utility model is designed with a unique fan cover 20, which can achieve full mixing and convection of the air in the accommodating cavity 11 of the box body 10, so that the temperature of each area in the accommodating cavity 11 remains consistent, avoids excessive local temperature difference, and improves the heat exchange effect of the vehicle refrigerator 100.

[0053] refer to Figure 1 The embodiment of the utility model further provides a vehicle, including a vehicle body (not shown) and the vehicle refrigerator 100 in the embodiment of the utility model, and the vehicle refrigerator 100 is arranged on the vehicle body.

[0054] The vehicle may be a sedan, a station wagon, a motorhome, or other vehicle types, and may be a pure electric vehicle, a hybrid vehicle, a gasoline vehicle, a diesel vehicle, etc., without limitation. The vehicle refrigerator 100 may be arranged at any position in the passenger compartment of the vehicle body, and is used to heat food, drinks, etc., so as to provide passengers with delicious food and cool and refreshing drinks.

[0055] The vehicle of the embodiment of the utility model adopts the vehicle refrigerator 100 of the embodiment of the utility model. The vehicle refrigerator 100 has a good heat exchange effect and can achieve a better driving experience.

[0056] The fan cover 20 of the embodiment of the utility model is described in detail below.

[0057] refer to Figure 1 and Figure 2 The embodiment of the utility model provides a fan cover 20, including a first cover plate 21, a second cover plate 22, a fan 23 and guide ribs 24.

[0058] The first cover plate 21 is plate-shaped and matches the shape of the opening of the box body 10, that is, the distances between the four edges of the first cover plate 21 and the four side walls of the accommodating cavity 11 are substantially equal at all locations. There is also a gap between the first cover plate 21 and the four side walls of the accommodating cavity 11, so that the first cover plate 21 can be completely accommodated in the accommodating cavity 11.

[0059] The second cover plate 22 is plate-shaped and fits the shape of the opening of the box body 10, that is, the distances between the four edges of the second cover plate 22 and the four side walls of the accommodating cavity 11 are substantially equal at all locations. There may be a gap between the second cover plate 22 and the four side walls of the accommodating cavity 11, so that the second cover plate 22 can be completely accommodated in the accommodating cavity 11. The second cover plate 22 can also be connected to the box body 10, that is, the four edges of the second cover plate 22 can be connected to the four side walls of the accommodating cavity 11 at the opening of the box body 10.

[0060] The second cover plate 22 is opposite to the first cover plate 21 and is spaced apart. The first cover plate 21 is closer to the bottom wall of the accommodating cavity 11 than the second cover plate 22. For the embodiment with the top cover 30, the surface of the second cover plate 22 facing away from the first cover plate 21 can be connected to the top cover 30. The size of the second cover plate 22 is slightly larger than that of the first cover plate 21, and the orthographic projection of the first cover plate 21 on the second cover plate 22 all falls on the second cover plate 22, and the four peripheral edges of the second cover plate 22 are located outside the corresponding four peripheral edges of the first cover plate 21.

[0061] The fan 23 includes an impeller, which is arranged between the first cover plate 21 and the second cover plate 22. The impeller includes a plurality of blades 232 arranged in sequence in the circumferential direction around the central axis. The central axis can be a physical rotating shaft or an axis of rotation of the impeller, and there may not be a physical rotating shaft. The blades 232 may be rotationally symmetrical or asymmetrical around the central axis without limitation.

[0062] refer to Figure 2 and Figure 6 The impeller further comprises a connecting bowl 231, which is bowl-shaped and comprises a bottom plate 2311 and a surrounding plate 2312. The bottom plate 2311 may be in the shape of a flat plate. The surrounding plate 2312 is an annular shape connected end to end and connected to the four peripheral edges of the bottom plate 2311. The surrounding plate 2312 is in an arc shape concave toward the space enclosed by the connecting bowl 231, and the surrounding plates 2312 are all located on the outer peripheral side of the bottom plate 2311. The vicinity of one end of the surrounding plate 2312 away from the bottom plate 2311 is roughly parallel to the second cover plate 22, one end of the blade 232 is connected to the outer peripheral surface of the surrounding plate 2312, and can be roughly connected from one end of the surrounding plate 2312 connected to the bottom plate 2311 to the vicinity of one end away from the bottom plate 2311.

[0063] Optional, reference Figure 2The impeller further includes a connecting ring 233, which is annular and connected end to end, and is connected to one end of the plurality of blades 232 away from the shroud 2312, and is used to enhance the structural stability of the plurality of blades 232. The connecting ring 233 can be arranged substantially opposite to one end of the shroud 2312 away from the bottom plate 2311 in the direction from the first cover plate 21 to the second cover plate 22.

[0064] The fan 23 also includes a motor 234 and a support 235. The output shaft of the motor 234 is connected to the bottom plate 2311 of the connecting bowl 231. The output shaft of the motor 234 is the central axis of the impeller. The motor 234 is also connected to the support 235, and the support 235 is connected and fixed to the second cover plate 22.

[0065] Optionally, the second cover plate 22 is provided with a through mounting hole 223 along the thickness direction (i.e., the direction in which the second cover plate 22 is opposite to the first cover plate 21), and a mounting portion 224 is provided on the surface of the second cover plate 22 facing away from the first cover plate 21, and the mounting portion 224 is provided close to the mounting hole 223. The support 235 includes a disk body 2351 and a connecting portion 2352, the disk body 2351 is accommodated in the mounting hole 223 and the disk body 2351 closes the mounting hole 223, the connecting portion 2352 is connected to the disk body 2351 and protrudes from the outer periphery of the disk body 2351, and the connecting portion 2352 is connected to the mounting portion 224. Optionally, the mounting portion 224 is a convex column, and the connecting portion 2352 is provided with a hole, and the hole of the mounting portion 224 cooperates with the convex column of the mounting portion 224. The mounting portion 224 and the connecting portion 2352 can be multiple and spaced apart.

[0066] The motor 234 is powered on to drive the impeller to rotate, and the multiple blades 232 of the impeller can inhale the air in the receiving chamber 11 of the box body 10 of the vehicle refrigerator 100 from the air inlet 251 and blow it out from the air outlet 252, so that the gas in the receiving chamber 11 is transported from one area to another area, so that the gas in the receiving chamber 11 is mixed. The specific arrangement of the air inlet 251 and the air outlet 252 is not limited.

[0067] refer to Figure 2 and Figure 3 The guide rib 24 connects the first cover plate 21 and the second cover plate 22 and is located at the periphery of the fan 23. Optionally, there are a plurality of guide ribs 24, and the plurality of guide ribs 24 are arranged at intervals at the periphery of the fan 23.

[0068] Optionally, the guide rib 24 is an integrated structure with the first cover plate 21 and / or the second cover plate 22. The integrated structure can reduce the number of connected parts and improve the strength of the connection structure. Alternatively, the guide rib 24 can also be a split structure with the first cover plate 21 and the second cover plate 22, and can be connected and fixed by means of snap connection, screw connection, etc.

[0069] Optional, reference Figure 2 , Figure 6 and Figure 7 The first cover plate 21 is provided with an air inlet 251, and the end of the impeller axially away from the support 235 corresponds to the air inlet 251. The first cover plate 21, the second cover plate 22 and the guide rib 24 enclose an air duct 26. The edges of the first cover plate 21 and the second cover plate 22 form an air outlet 252. The air duct 26 is connected with the air inlet 251 and the air outlet 252. In this way, the air in the accommodating chamber 11 of the box body 10 enters the air duct 26 from the air inlet 251, and the rotation of the impeller of the fan 23 drives the air to flow from the air inlet 251 to the air outlet 252, and then flows back to the accommodating chamber 11 from the air outlet 252, so that the air in the accommodating chamber 11 flows from the area near the middle to the area near the edge, and the air in different areas of the accommodating chamber 11 is mixed, so that the temperature in each place is more consistent, so as to improve the heat exchange effect.

[0070] Optional, reference Figure 6 and Figure 7 The air inlet 251 and the air outlet 252 are both oriented toward the side of the first cover plate 21 facing away from the second cover plate 22. The air inlet 251 and the air outlet 252 are both connected to the accommodating cavity 11, and the opening directions of the air inlet 251 and the air outlet 252 are both oriented toward the accommodating cavity 11, so that the air in the accommodating cavity 11 flows from the air inlet 251 into the air duct 26, and flows back to the accommodating cavity 11 from the air outlet 252, and the air flow path is relatively smooth, reducing the air flow resistance.

[0071] The end of the impeller away from the support 235 and the end of the plurality of blades 232 away from the shroud 2312 are not blocked, and the rotation of the impeller allows air to enter the end of the impeller away from the support 235 from the air inlet 251 of the first cover plate 21, and enter the space enclosed by the shroud 2312 and blades 232 inside the impeller, and then be sent out from the end of the plurality of blades 232 away from the shroud 2312. The shroud 2312 guides the air, so that the air flows from the axial direction of the impeller to the radial direction of the impeller. The plurality of blades 232 cut the air and promote the air flow.

[0072] refer to Figure 2 , Figure 4 and Figure 5 The end of the blade 232 away from the central axis of the impeller (that is, the end of the blade 232 away from the shroud 2312) is the first end 2321, and the end of the guide rib 24 close to the fan 23 is the second end 241. Figure 5 During the rotation of the impeller, the tangent line of the first end 2321 which is closest to the impeller and the tangent line of the second end 241 have an angle A which satisfies: 65°≤A≤120°.

[0073] Among them, during the rotation of the impeller, the first end 2321 and the second end 241 that are closest to each other, one situation is that at any moment, the distance between any one guide rib 24 and one of the blades 232 is closer than the distance between other blades 232, or the distance between any one blade 232 and one of the guide ribs 24 is closer than the distance between other guide ribs 24, then this guide rib 24 and the blade 232 are determined to be the closest; another situation is that a blade 232 and a guide rib 24 are first selected, and then the blade 232 is rotated to the position closest to the guide rib 24, at which time the distance between the guide rib 24 and the blade 232 is the closest.

[0074] The tangent lines of the first end 2321 and the second end 241 are defined in a cross section at the same height in the direction opposite to the first cover plate 21 and the second cover plate 22. If the orthographic projections of the guide rib 24 and the blade 232 on the first cover plate 21 or the second cover plate 22 are linear, they can also be defined in the orthographic projections of the first cover plate 21 or the second cover plate 22.

[0075] The tangent line of the first end 2321 and the tangent line of the second end 241 are both tangent lines of the edges of the guide rib 24 and the blade 232 on the same side of the surface. The same side surface refers to the surfaces of the two surfaces facing the same side.

[0076] The specific value of the angle A can be 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 115°, 120°, etc., without limitation.

[0077] When 65°≤A≤120° is satisfied, the guide rib 24 can guide the air, so that the air flow out of the guide rib 24 is evenly distributed, so that the air in the accommodating cavity 11 of the vehicle refrigerator 100 is evenly mixed. The rotation of the blade 232 can also accelerate the air flow, increase the air mixing speed, and improve the heat exchange efficiency. If the angle A is less than 65°, the air flowing out of the blade 232 is blocked by the guide rib 24. The reaction force is large, and there is a large wind resistance, which is not conducive to increasing the air flow rate. If the angle A is greater than 120°, the guide effect of the guide rib 24 is weak, and the effect of evenly mixing the air is poor.

[0078] Therefore, the fan cover 20 provided in the embodiment of the utility model is provided with a first cover plate 21, a second cover plate 22, a fan 23 and a guide rib 24, and during the rotation of the impeller, the tangent of the first end 2321 closest to the tangent of the second end 241 has an angle A that satisfies: 65°≤A≤120°, so that the air in the accommodating cavity 11 of the body 10 of the vehicle refrigerator 100 can be driven by the fan cover 20 to be fully mixed, thereby improving the heat exchange effect.

[0079] Optional, reference Figure 5During the rotation of the impeller, the first end 2321 and the second end 241 that are closest to each other have a distance d that satisfies: 3mm≤d≤Da / 2, where Da is the diameter of the impeller.

[0080] The definition of the closest distance is referred to above and will not be repeated here. The diameter of the impeller can be the distance from the first end 2321 of the blade 232 to the central axis of the impeller, or the distance from the outer circumference of the connecting ring 233 to the central axis of the impeller.

[0081] Satisfying 3mm≤d≤Da / 2, the distance between the blade 232 and the guide rib 24 is moderate, neither too close nor too far, which is conducive to the smooth flow of air. If d is less than 3mm, the distance between the blade 232 and the guide rib 24 is too close, and the air flow path is difficult to form a streamline. The air flowing out of the blade 232 encounters the guide rib 24 in a very short distance, which is easy to produce local turbulence, eddy currents, etc., and generate wind resistance, which is not conducive to increasing the air flow rate. If d is greater than Da / 2, the distance between the blade 232 and the guide rib 24 is too far, and the air needs a long distance to reach the guide rib 24 after flowing out from the blade 232. The air may be locally gathered in the gap between the blade 232 and the guide rib 24, and the air flow rate may be different at different positions on the circumference of the impeller, which affects the uniform distribution of the air and is not conducive to the uniform mixing of the air in the accommodating cavity 11.

[0082] Optional, reference Figure 5 , along the rotation direction of the impeller, the blade 232 is in an arc shape that bulges from the back to the front. Exemplarily, the impeller rotates in a counterclockwise direction, and each blade 232 is in an arc shape that bulges from the back to the front in the counterclockwise direction in the circumference of the impeller. In this way, the shape of the blade 232 is more streamlined, so that the air has more stable aerodynamic characteristics, reduces noise and vibration, and extends the service life of the blade 232. It can also increase the torsional stiffness and strength of the blade 232, so that it can better resist the effects of airflow, and can also reduce air resistance, increase air flow rate, and improve heat exchange efficiency.

[0083] Optional, reference Figure 5 The guide rib 24 extends in a straight line. The guide rib 24 extends in a straight line, has a simple structure, and is easy to manufacture and assemble.

[0084] It should be understood that combined Figure 2 , Figure 3 and Figure 5, the blade 232 is arc-shaped and the guide rib 24 extends in a straight line, which refers to the overall shape, and may have other shapes in local positions. Combined with the above description, the shape of the blade 232 and the guide rib 24 refers to the shape in any cross section in the direction from the first cover plate 21 to the second cover plate 22, or the shape in the orthographic projection of the first cover plate 21 or the second cover plate 22. The guide rib 24 extends in a straight line, and the tangent line of the second end 241 mentioned above is the straight line where the guide rib 24 extends in a straight line.

[0085] Optional, reference Figure 5 The guide rib 24 also includes a third end 242 opposite to the second end 241. The straight line passing through the central axis of the impeller and the second end 241 is a reference line Q. The third end 242 is located in front of the reference line Q in the rotation direction of the impeller.

[0086] In other words, the straight extension direction of the guide rib 24 is not along the radial direction of the impeller, but has an angle with the radial direction of the impeller. The guide rib 24 is also equivalent to being rotated, and the vector pointing from the second end 241 to the third end 242 is decomposed into a component along the radial direction of the impeller and a circumferential component in the same direction of rotation of the impeller.

[0087] Such a configuration has a better guiding effect than the guide ribs 24 extending in the radial direction of the impeller. The flow direction of the air coming out of the impeller is substantially the same as the extending direction of the guide ribs 24, which can reduce the risk of air forming vortices in the air duct 26 and improve noise.

[0088] The plurality of guide ribs 24 are arranged in this way, so that the impeller has a good guide effect all around, which facilitates the full mixing of the air in the accommodating cavity 11 of the box body 10 .

[0089] Optional, reference Figure 5 , the second ends 241 of the plurality of guide ribs 24 form a circle concentric with the impeller. That is to say, a circle is made with the central axis of the impeller passing through the second end 241 of one of the guide ribs 24, and the second ends 241 of the other guide ribs 24 also fall on the circle. In this way, the distances between the plurality of guide ribs 24 and the impeller are the same, and the air at the impeller flows out and enters the space at each guide rib 24 at almost the same angle, so that the flow field is uniform and consistent, and the effect of uniform mixing of the air is good.

[0090] In one embodiment, reference Figure 6The air duct 26 includes a closing section 261, and the closing section 261 is close to the air outlet 252. From the air inlet 251 to the air outlet 252, the distance between the first cover plate 21 and the second cover plate 22 at the closing section 261 gradually decreases. The closing section 261 is provided, and when the air flows through the closing section 261, the air outlet area gradually decreases from the air inlet 251 to the air outlet 252, and the air pressure gradually increases, and the air flow rate gradually increases, so that the air outlet flow rate of the air outlet 252 can be increased, and the air can be blown to a deeper position of the accommodating cavity 11 after flowing out from the air outlet 252, which is conducive to improving the mixing effect of the air in the accommodating cavity 11, and further improving the heat exchange effect of the vehicle refrigerator 100.

[0091] Optional, reference Figure 2 , Figures 5 to 7 The first cover plate 21 includes a first base plate 211, a connecting plate 212 and a first edge plate 213. The first base plate 211 is provided with an air inlet 251, the connecting plate 212 is connected to the outer peripheral edge of the first base plate 211, and the first edge plate 213 is connected to the outer peripheral edge of the connecting plate 212. The second cover plate 22 includes a second base plate 221 and a second edge plate 222, and the second edge plate 222 is connected to the four peripheral edges of the second base plate 221. The four peripheral edges of the first edge plate 213 and the four peripheral edges of the second edge plate 222 form an air outlet 252, the connecting plate 212 and the first base plate 211 have an inclined angle, and the space between the connecting plate 212 and the second base plate 221 forms a closing section 261.

[0092] The first substrate 211 and the second substrate 221 may be substantially rectangular flat plates, the connecting plate 212, the first edge plate 213 and the second edge plate 222 may be annular non-flat plates, the inner peripheral edge of the connecting plate 212 is connected to the outer peripheral edge of the first substrate 211, the outer peripheral edge of the connecting plate 212 is connected to the inner peripheral edge of the first edge plate 213, and the inner peripheral edge of the second edge plate 222 is connected to the outer peripheral edge of the second substrate 221. The first cover plate 21 may be an integrated structure, and the second cover plate 22 may also be an integrated structure.

[0093] The first edge plate 213 and the second edge plate 222 can be arranged substantially in parallel, and the cross-sectional shape of the two is substantially an arc convex from the bottom wall of the accommodating cavity 11 toward the opening. One end of the space between the first edge plate 213 and the second edge plate 222 is smoothly connected to the aforementioned closing section 261, and the other end is connected to the air outlet 252 to ensure smooth air flow.

[0094] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0095] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A fan cover, characterized in that: include: first cover plate; a second cover plate, opposite to and spaced from the first cover plate; A fan, comprising an impeller, the impeller being arranged between the first cover plate and the second cover plate, the impeller comprising a plurality of blades arranged in sequence in a circumferential direction around a central axis, and an end of the blade away from the central axis being a first end; A guide rib, connecting the first cover plate and the second cover plate and located at the periphery of the fan, wherein the end of the guide rib close to the fan is a second end; Wherein, during the rotation of the impeller, the tangent line of the first end closest to the second end has an angle A that satisfies: 65°≤A≤120°.

2. The fan cover according to claim 1, characterized in that: During the rotation of the impeller, the first end and the second end which are closest to each other have a distance d which satisfies: 3mm≤d≤Da / 2, where Da is the diameter of the impeller.

3. The fan cover according to claim 1 or 2, characterized in that: Along the rotation direction of the impeller, the blades are in an arc shape convex from the rear to the front.

4. The fan cover according to claim 1 or 2, characterized in that: The guide ribs extend along a straight line.

5. The fan cover according to claim 1 or 2, characterized in that: The guide rib also includes a third end opposite to the second end, a straight line passing through the central axis and the second end is a reference line, and the third end is located in front of the reference line in the rotation direction of the impeller.

6. The fan cover according to claim 5, characterized in that: There are a plurality of guide ribs, and the plurality of guide ribs are arranged at intervals on the outer circumference of the fan.

7. The fan cover according to claim 6, characterized in that: The second ends of the plurality of guide ribs form a circle concentric with the impeller.

8. The fan cover according to claim 1 or 2, characterized in that: The first cover plate is provided with an air inlet, one axial end of the impeller corresponds to the air inlet, the first cover plate, the second cover plate and the guide ribs together form an air duct, the edges around the first cover plate and the second cover plate form an air outlet, and the air duct is connected to the air inlet and the air outlet.

9. The fan cover according to claim 8, characterized in that: The air inlet and the air outlet are both oriented toward a side of the first cover plate facing away from the second cover plate.

10. The fan cover according to claim 8, characterized in that: The air duct includes a closing section, which is close to the air outlet. From the air inlet to the air outlet, the distance between the first cover plate and the second cover plate at the closing section gradually decreases.

11. The fan cover according to claim 10, characterized in that: The first cover plate includes a first substrate, a connecting plate and a first edge plate, the first substrate is provided with the air inlet, the connecting plate is connected to the outer peripheral edge of the first substrate, the first edge plate is connected to the outer peripheral edge of the connecting plate, the second cover plate includes a second substrate and a second edge plate, the second edge plate is connected to the four peripheral edges of the second substrate, the four peripheral edges of the first edge plate and the four peripheral edges of the second edge plate form the air outlet, the connecting plate and the first substrate have an inclined angle, and the space between the connecting plate and the second substrate forms the closing section.

12. The fan cover according to claim 1 or 2, characterized in that: The guide rib is an integrated structure with the first cover plate and / or the second cover plate.

13. A vehicle refrigerator, characterized in that: It comprises a box body, a heat exchanger and a fan cover as claimed in any one of claims 1 to 12, wherein the box body has a accommodating cavity with one end open, the heat exchanger is arranged on the outer surface of the box body, and the fan cover is arranged at the opening of the box body to close the accommodating cavity.

14. A vehicle, characterized in that: The invention comprises a vehicle body and the vehicle refrigerator as claimed in claim 13, wherein the vehicle refrigerator is arranged on the vehicle body.

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