Double-layer flow blower and automobile air conditioner

Abstract

The application relates to the technical field of automobile air conditioners, and particularly discloses a double-layer flow blower, a blade wheel assembly of which is rotatably arranged in a volute of a shell and penetrates a partition plate connected with the volute, the partition plate divides an inner space of the volute into an upper flow space and a lower flow space, the blade wheel assembly comprises detachable upper and lower blade wheels, the upper blade wheel is arranged in the upper flow space, the lower blade wheel is arranged in the lower flow space, the upper and lower blade wheels are fixed on an output shaft of a blowing motor through press fitting, the upper blade wheel is connected with a first flow guide plate, and the lower blade wheel is connected with a second flow guide plate, the first and second flow guide plates have good flow guiding effects on external fresh air and internal circulating air, the external fresh air or the internal circulating air entering perpendicularly to the blade wheel assembly can be blown out along a radial direction of the blade wheel assembly, and the problem that air interflows between the upper flow space and the lower flow space is avoided. The application further provides an automobile air conditioner comprising the double-layer flow blower.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile air conditioning technology, and in particular to a double-layer flow blower and an automobile air conditioner. BACKGROUND

[0002] At present, the conventional power fuel vehicle in the automobile industry uses engine waste heat to realize the heating of the air conditioner in the vehicle. In a low temperature environment, as long as the engine is normally running, a stable heat source can be provided for the air conditioner to heat. However, the new energy vehicle does not have an engine, and the heating scheme usually uses PTC electric heating to replace the heating core on the original air conditioner box. The electric heating method consumes a lot of energy, shortens the driving range of the new energy vehicle, and cannot meet the demand of people for long-distance driving.

[0003] The new energy vehicle also has a heating scheme using a heat pump technology. However, the conventional air conditioner box is not good enough to match this technology, which requires the development of a new air conditioner box structure to match it, so as to effectively heat, effectively defog, and reduce energy consumption in a low temperature environment, thereby improving the driving range and reducing driving anxiety. Therefore, some double-layer flow air conditioner boxes appear in the prior art to meet the above requirements. However, the existing double-layer flow air conditioner box uses lower layer flow internal circulation for heating and upper layer flow external circulation for defogging. When the vehicle speed is high, there may be air leakage between the two, resulting in poor experience of the passengers in the vehicle, and also causing heat loss, increasing the thermal load of the power battery, and reducing the defogging effect.

[0004] Therefore, there is an urgent need for a double-layer flow blower and an automobile air conditioner to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a double-layer flow blower and an automobile air conditioner, which can separate the upper and lower channels to avoid air leakage between them, thereby reducing the thermal load of the power battery and preventing the window from fogging, while keeping the fresh air injection in the passenger cabin and greatly improving the comfort.

[0006] To achieve the above purpose, the present application adopts the following technical scheme:

[0007] On the one hand, the present application provides a double-layer flow blower, comprising:

[0008] a housing, the housing comprising a volute, the volute forming an installation space therein, a partition plate being arranged in the volute, the partition plate separating the installation space into an upper layer flow space and a lower layer flow space, the upper layer flow space being in communication with an external circulation air duct, and the lower layer flow space being in communication with an internal circulation air duct;

[0009] The impeller assembly comprises detachable upper and lower impellers, the upper impeller is arranged in the upper flow space, the lower impeller is arranged in the lower flow space, the upper impeller is connected with the first guide plate, the lower impeller is connected with the second guide plate, the first guide plate is connected with the second guide plate, the outer edge of the second guide plate is provided with an anti-wind channeling boss, and the anti-wind channeling boss extends along the radial direction of the lower impeller;

[0010] The air blower motor is connected with the center of the first guide plate and the second guide plate, and drives the rotation of the impeller assembly.

[0011] Optionally, the lower end surface of the first guide plate is provided with a first limiting edge, the upper end surface of the second guide plate is provided with a second limiting edge, the first limiting edge and the second limiting edge extend along the axial direction of the impeller assembly, the end of the first limiting edge abuts against the upper end surface of the second guide plate, the end of the second limiting edge abuts against the lower end surface of the first guide plate, and there is a gap a between the first guide plate and the second guide plate along the axial direction of the impeller assembly.

[0012] Optionally, the first limiting edge and the second limiting edge are annular, the first limiting edge and the second limiting edge are mutually sleeved, the side wall of the first limiting edge and the side wall of the second limiting edge abut against each other to limit the displacement of the upper impeller along the radial direction of the lower impeller.

[0013] Optionally, the edge of the second guide plate is upwardly provided with a third limiting edge, the root of the third limiting edge is connected with the root of the anti-wind channeling boss, and the side wall of the third limiting edge abuts against the edge of the first guide plate to limit the displacement of the upper impeller along the radial direction of the lower impeller.

[0014] Optionally, the side of the partition plate facing the impeller assembly is provided with a first wind blocking boss, and there is a gap b between the end of the first wind blocking boss and the end of the third limiting edge.

[0015] Optionally, the side of the first wind blocking boss facing the anti-wind channeling boss is provided with a first inclined surface, the side of the anti-wind channeling boss facing the first wind blocking boss is provided with a second inclined surface, the first inclined surface is parallel to the second inclined surface, and there is a gap c between the first inclined surface and the second inclined surface.

[0016] Optionally, the inclination angle β of the first inclined surface and the second inclined surface ranges from 0° to 75°.

[0017] Optionally, the side of the partition plate facing the impeller assembly is provided with a second wind blocking boss, and there is a gap d between the edge of the second wind blocking boss along the radial direction and the anti-wind channeling boss.

[0018] Optionally, the lower end surface of the first guide plate is provided with a plurality of first reinforcing ribs, and the plurality of first reinforcing ribs are uniformly distributed along the radial direction of the first guide plate; and / or

[0019] The upper end surface of the second guide plate is provided with a plurality of second reinforcing ribs, and the plurality of second reinforcing ribs are uniformly distributed along the radial direction of the second guide plate.

[0020] In another aspect, the present application provides an automobile air conditioner comprising the double-layer flow blower of any one of the above-mentioned aspects.

[0021] The present application has the following beneficial effects:

[0022] The present application provides a double-layer flow blower, which comprises a shell, an impeller assembly and a blowing motor arranged in the shell, the impeller assembly is rotatably arranged in a volute of the shell and penetrates a partition plate connected with the volute, the partition plate separates the volute into an upper flow space and a lower flow space, the impeller assembly comprises an upper impeller and a lower impeller which are detachably connected, the upper impeller is arranged in the upper flow space, the lower impeller is arranged in the lower flow space, the upper impeller and the lower impeller are fixed on an output shaft of the blowing motor by press fitting, the upper impeller is connected with a first guide plate, and the lower impeller is connected with a second guide plate, the first guide plate and the second guide plate can play a good guiding effect on external fresh air and internal circulating air, so that the external fresh air or the internal circulating air entering perpendicularly to the impeller assembly can be blown out along the radial direction of the impeller assembly. By arranging the first guide plate, the second guide plate and the partition plate, the upper flow space and the lower flow space are relatively separated, and the problem of air leakage between the upper flow space and the lower flow space is avoided. In addition, the outer edge of the first guide plate is provided with an anti-leakage boss, so as to further ensure that the gas blown along the radial direction will not pass through the gap between the anti-leakage boss and the partition plate, thereby causing air leakage, the heat loss of the internal circulating air in the lower flow space is reduced, the thermal load is reduced, the energy consumption is reduced, and the defrosting effect is met while the window is not fogged.

[0023] The present application also provides an automobile air conditioner comprising the double-layer flow blower, by which the external fresh air and the internal circulating air can be introduced into the vehicle through the upper flow space and the lower flow space respectively, the air leakage between the two air flows is small, the energy consumption and the heat loss are reduced, and the heating and defrosting effects are considered. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic view of the double-layer flow blower provided in the embodiments of the present application;

[0025] Figure 2 It is a schematic view of the gas flow direction in the double-layer flow blower provided in the embodiments of the present application;

[0026] Figure 3 Fig. 1 is a structural schematic diagram of a shell of the present application; Figure 1 Fig. 2 is a partial enlarged view of A in Fig. 1;

[0027] Figure 4 Fig. 3 is a partial enlarged view of B in Fig. 1; Figure 1 Fig. 4 is a partial enlarged view of C in Fig. 1;

[0028] Figure 5 Fig. 5 is a structural schematic diagram of an impeller assembly provided in an embodiment of the present application. Figure 1 Fig. 6 is a structural schematic diagram of a shell provided in an embodiment of the present application.

[0029] Fig. 7 is a structural schematic diagram of an impeller assembly provided in an embodiment of the present application. Figure 6 Fig. 8 is a structural schematic diagram of a shell provided in an embodiment of the present application.

[0030] Fig. 9 is a structural schematic diagram of an impeller assembly provided in an embodiment of the present application. Fig. 10 is a structural schematic diagram of a shell provided in an embodiment of the present application.

[0031] 100, shell; 101, outer circulating air duct; 102, inner circulating air duct; 110, volute; 111, upper volute; 112, lower volute; 1101, guide part; 120, cover; 130, partition plate; 131, first wind-blocking platform; 132, second wind-blocking platform; 140, air inlet plate;

[0032] 200, impeller assembly; 210, upper impeller; 211, first flow guide plate; 212, first limiting edge; 213, first fixing hole; 214, first blade; 215, first hub edge; 216, first reinforcing rib; 220, lower impeller; 221, second flow guide plate; 222, anti-air-leakage boss; 223, second limiting edge; 224, third limiting edge; 225, second fixing hole; 226, second blade; 227, second hub edge; 228, second reinforcing rib; 230, wind-blocking structure; 231, convex circular arc; 232, concave circular arc;

[0033] 300, air-blowing motor. DETAILED DESCRIPTION

[0034] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0035] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the "above", "over" and "on" of the first feature to the second feature include the first feature above and obliquely above the second feature, or only indicate that the first feature is higher than the second feature in horizontal height. The "below", "under" and "under" of the first feature to the second feature include the first feature below and obliquely below the second feature, or only indicate that the first feature is lower than the second feature in horizontal height.

[0036] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application.

[0038] As Figure 1 and Figure 2As shown, this embodiment provides a dual-layer flow blower, which includes a housing 100, an impeller assembly 200, and a blower motor 300. The housing 100 includes a volute 110, which forms an installation space. The impeller assembly 200 and the blower motor 300 are both disposed within the volute 110. The output end of the blower motor 300 is connected to the impeller assembly 200, thereby driving the impeller assembly 200 to rotate. The volute 110 is equipped with a partition 130. The outer edge of the partition 130 is fixed to the inner wall of the volute 110. The partition 130 divides the installation space into an upper laminar flow space and a lower laminar flow space. The upper laminar flow space is connected to the external circulation duct 101, which is connected to the external circulation air inlet. Thus, fresh air from outside can be supplied to the vehicle through the upper laminar flow space. The lower laminar flow space is connected to the internal circulation duct 102, which is connected to the internal circulation air inlet. Thus, the circulating air inside the vehicle can be supplied to the vehicle through the lower laminar flow space. This separates the upper and lower laminar flow spaces, preventing cold air from entering the vehicle. Passengers in the vehicle have a good comfort experience, and there is no heat loss, low heat load, and no fogging of the windows.

[0039] Furthermore, the impeller assembly 200 includes a detachable upper impeller 210 and a lower impeller 220. The upper impeller 210 is disposed in the upper laminar flow space, and the lower impeller 220 is disposed in the lower laminar flow space. The upper impeller 210 and the lower impeller 220 are fixed to the output shaft of the blower motor 300 by press fitting. The upper impeller 210 is connected to the first guide plate 211, and the lower impeller 220 is connected to the second guide plate 221. Both the first guide plate 211 and the second guide plate 221 are conical, and their bottoms are arranged opposite each other. Their sidewalls have a certain curvature, so that the first guide plate 211 and the second guide plate 221 can play a good guiding role for external fresh air and internal circulating air, so that external fresh air or internal circulating air perpendicular to the impeller assembly 200 can be blown out along the radial direction of the impeller assembly 200 (the flow direction of external fresh air and internal circulating air is as follows). Figure 2 As shown in the diagram, the upper impeller 210 and the lower impeller 220 are separated by the first guide plate 211 and the second guide plate 221, thus separating the upper laminar flow space and the lower laminar flow space. When installing the impeller assembly 200, the center of the lower impeller 220 can be first installed on the output shaft of the blower motor 300, and then the center of the upper impeller 210 can be installed on the output shaft of the blower motor 300. The upper impeller 210 is then pressed at the end of the output shaft, thereby fastening the first guide plate 211 and the second guide plate 221 together, and fixing the impeller assembly 200 on the output shaft.

[0040] Further, the outer edge of the second flow guide plate 221 is provided with an anti-bleed bulge 222 extending along the radial direction of the lower impeller 220. By virtue of the arrangement of the partition plate 130 and the anti-bleed bulge 222, the mutual bleed between the upper flow space and the lower flow space can be effectively avoided.

[0041] Referring to Figure 3 The lower end surface of the first flow guide plate 211 is provided with a first limiting rim 212, and the upper end surface of the second flow guide plate 221 is provided with a second limiting rim 223. Both the first limiting rim 212 and the second limiting rim 223 extend along the axial direction of the impeller assembly 200. The end of the first limiting rim 212 abuts against the upper end surface of the second flow guide plate 221, and the end of the second limiting rim 223 abuts against the lower end surface of the first flow guide plate 211. Thus, along the axial direction of the impeller assembly 200, there is a gap a between the first flow guide plate 211 and the second flow guide plate 221. By virtue of the arrangement of the gap a, the slight bleed of the upper impeller 210 or the lower impeller 220 along the axial direction thereof can be absorbed, and the abrasion problem when the upper impeller 210 and the lower impeller 220 slightly vibrate can be relieved. Exemplarily, the gap a has a value ranging from 0.2 mm to 3.0 mm, for example, the gap a can be 0.2 mm, 0.5 mm, 0.8 mm, 1.0 mm, 1.5 mm, 2.0 mm, etc., which will not be described one by one here.

[0042] Further, both the first limiting rim 212 and the second limiting rim 223 are annular. In the present embodiment, the first limiting rim 212 is taken as an example to be arranged outside the second limiting rim 223. There is a gap between the first limiting rim 212 and the second limiting rim 223. The edge of the second flow guide plate 221 is upwardly provided with a third limiting rim 224. The root of the third limiting rim 224 is connected with the root of the anti-bleed bulge 222, and the side wall of the third limiting rim 224 abuts against the edge of the first flow guide plate 211. Thus, the displacement of the upper impeller 210 along the radial direction of the lower impeller 220 is limited by the third limiting rim 224.

[0043] Of course, in some embodiments, when the first limiting rim 212 and the second limiting rim 223 are arranged in each other, the side wall of the first limiting rim 212 can also abut against the side wall of the second limiting rim 223. Thus, the displacement of the upper impeller 210 along the radial direction of the lower impeller 220 is limited by the mutual limitation between the first limiting rim 212 and the second limiting rim 223. Meanwhile, such an arrangement also makes it easier to align the upper impeller 210 and the lower impeller 220 when they are assembled.

[0044] Further, in order to ensure the smoothness of the rotation of the impeller assembly 200, the outer edge of the impeller assembly 200 is spaced apart from the inner edge of the partition plate 130, so as to avoid the scratching between the impeller assembly 200 and the partition plate 130, and also to avoid the wind channeling problem caused by the external fresh air or the internal circulating air passing through the gap between the impeller and the partition plate 130. To this end, in the present embodiment, the partition plate 130 is provided with a first wind blocking platform 131 on the side facing the impeller assembly 200, and the end of the first wind blocking platform 131 and the end of the third limiting edge 224 have a gap b. The first wind blocking platform 131 is provided with a first inclined surface on the side facing the anti-wind channeling boss 222, and the anti-wind channeling boss 222 is provided with a second inclined surface on the side facing the first wind blocking platform 131. The first inclined surface is parallel to the second inclined surface, and the first inclined surface and the second inclined surface have a gap c. The partition plate 130 is provided with a second wind blocking platform 132 on the side facing the impeller assembly 200, and the second wind blocking platform 132 and the edge of the anti-wind channeling boss 222 in the radial direction have a gap d. The gap b, the gap c and the gap d form a zigzag-shaped channel, which increases the resistance of the gas passing through the channel, thereby playing a good wind blocking role and avoiding wind channeling in the upper and lower flow spaces. In addition, the gap b and the gap d can absorb the radial runout tolerance of the impeller assembly 200, and the gap c can absorb the axial runout tolerance of the impeller assembly 200, further ensuring that the impeller assembly 200 and the partition plate 130 will not scratch. Optionally, the gap b, the gap c and the gap d have a value range of 0.5mm-6.0mm, for example, the gap b, the gap c and the gap d can be 0.5mm, 0.7mm, 0.8mm, 1.0mm, 2.0mm, 3.0mm, 4.0mm, 5.0mm, 6.0mm, etc., which will not be listed one by one here.

[0045] Optionally, the inclination angle β of the first inclined surface and the second inclined surface in the present embodiment has a value range of 0°-75°. For example, the inclination angle β can be set to 0°, 10°, 20°, 30°, 40°, 50°, 60°, 70° or 75°, etc., which will not be listed one by one here.

[0046] Continuing to refer to Figure 1The shell 100 in the embodiment further comprises a cover 120, the outer circulating air inlet and the inner circulating air inlet are arranged on the cover 120, the volute 110 comprises a detachably connected upper volute 111 and a lower volute 112, the upper volute 111 and the lower volute 112 are buckled to each other and are arranged in the cover 120, two air inlet plates 140 are extended from the top end of the upper volute 111, an outer circulating air duct 101 is formed between the inner sides of the two air inlet plates 140, two inner circulating air ducts 102 are formed between the air inlet plates 140, the outer side of the volute 110 and the inner side of the cover 120, that is, the inner circulating air duct 102 comprises two and is located on both sides of the outer circulating air duct 101. The external fresh air directly enters the upper flow space through the outer circulating air inlet and the outer circulating air duct 101, and then is driven by the upper impeller 210 to blow to the window for defogging; the vehicle circulating air enters the lower flow space after being deflected at the bottom of the lower impeller 220 through the inner circulating air inlet and the inner circulating air duct 102, and then is driven by the lower impeller 220 to blow to the face or feet of the passenger for heating.

[0047] Further, referring to Figure 4 and Figure 5 In the embodiment, the entrance of the upper volute 111 communicating with the outer circulating air duct 101 and the entrance of the lower volute 112 communicating with the inner circulating air duct 102 are both provided with a guide part 1101, the guide part 1101 is formed by bending the edge of the entrance of the upper volute 111 and the lower volute 112, and the diameter of the guide part 1101 gradually decreases along the direction of gas flow, the guide part 1101 can play a good flow guiding effect on the external fresh air or the vehicle circulating air, which is conducive to the suction of the external fresh air into the upper flow space and the suction of the vehicle circulating air into the lower flow space.

[0048] Further, referring to Figure 6 The diameters of the upper impeller 210 and the lower impeller 220 in the embodiment are the same, the upper impeller 210 comprises a plurality of first blades 214, the top end of each first blade 214 is connected with a first hub rim 215, and the bottom end of each first blade 214 is connected with the outer edge of the upper end surface of a first flow guide plate 211; the lower impeller 220 comprises a plurality of second blades 226, the lengths of the second blades 226 and the first blades 214 are the same, the top end of each second blade 226 is connected with the outer edge of the lower end surface of a second flow guide plate 221, and the bottom end of each second blade 226 is connected with a second hub rim 227. By arranging the upper impeller 210 and the lower impeller 220 in a split manner, the difficulty of machining and assembling the impeller assembly 200 is reduced, and the assembly efficiency is relatively high.

[0049] Optionally, the first guide plate 211 is provided with a first fixing hole 213 at the center thereof, the second guide plate 221 is provided with a second fixing hole 225 at the center thereof, and the output shaft of the blowing motor 300 is sequentially arranged through the second fixing hole 225 and the first fixing hole 213, and then the upper impeller 210 and the lower impeller 220 are fixed by press fitting. The upper impeller 210 and the lower impeller 220 are coaxially arranged, the top end of the first guide plate 211 is located inside the upper impeller 210, and the top end of the second guide plate 221 is located inside the lower impeller 220. By arranging the wall surface of the first guide plate 211 and the second guide plate 221 as a concave arc surface structure, the external fresh air entering along the circumferential direction of the upper impeller 210 can be guided to flow along the radial direction of the upper impeller 210, and the internal circulating air entering along the circumferential direction of the lower impeller 220 can be guided to flow along the radial direction of the lower impeller 220, so as to ensure smooth flow of the gas in the upper space and the lower flow space, and no turbulence phenomenon occurs.

[0050] More preferably, referring to Figure 4 and Figure 5 In the embodiment, the end of the first blade 214 connected with the first hub rim 215 and the end of the second blade 226 connected with the second hub rim 227 are both provided with a wind blocking structure 230. The wind blocking structure 230 can avoid backflow of the external fresh air or the internal circulating air, thereby reducing noise. Specifically, the wind blocking structure 230 includes convex circular arcs 231 and concave circular arcs 232 with opposite directions, and the convex circular arcs 231 and the concave circular arcs 232 are smoothly connected. The convex circular arcs 231 are arranged at the end connected with the first hub rim 215 or the second hub rim 227. Compared with the impeller assembly 200 without the wind blocking structure 230, the noise generated when the impeller assembly 200 rotates is reduced after the wind blocking structure 230 is arranged, and the noise and abnormal sound are obviously improved.

[0051] Continuously referring to Figure 6 In the embodiment, the lower end surface of the first guide plate 211 is provided with a plurality of first reinforcing ribs 216, and the plurality of first reinforcing ribs 216 are uniformly distributed along the radial direction of the first guide plate 211. The first reinforcing ribs 216 can provide good support for the first guide plate 211, which is conducive to improving the rigidity and strength of the upper impeller 210. The upper end surface of the second guide plate 221 is provided with a plurality of second reinforcing ribs 228, and the plurality of second reinforcing ribs 228 are uniformly distributed along the radial direction of the second guide plate 221. The second reinforcing ribs 228 can provide good support for the second guide plate 221, which is conducive to improving the rigidity and strength of the lower impeller 220.

[0052] The embodiment also provides an automobile air conditioner, which comprises the double-layer flow blower, and external fresh air and indoor circulating air can be introduced into the automobile through the upper flow space and the lower flow space respectively, the air leakage between the two air inlets is small, the energy consumption and heat loss are reduced, and the heating and defogging effects are considered.

[0053] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. All the implementation modes do not need to be exhausted here. Any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A double layer flow blower, characterized by, The utility model relates to a kind of air supply device, including: Shell (100), the shell (100) includes volute (110), installation space is formed in the volute (110), partition (130) is equipped in the volute (110), the partition (130) separates the installation space into upper layer flow space and lower layer flow space, the upper layer flow space is communicated with outer circulating air duct (101), the lower layer flow space is communicated with inner circulating air duct (102); Impeller assembly (200), the impeller assembly (200) includes detachable upper impeller (210) and lower impeller (220), the upper impeller (210) is arranged in the upper layer flow space, the lower impeller (220) is arranged in the lower layer flow space, the upper impeller (210) is connected first guide vane (211), the lower impeller (220) is connected second guide vane (221), the first guide vane (211) is connected with the second guide vane (221) buckle, the outer edge of the second guide vane (221) is equipped with anti-air channeling boss (222), the anti-air channeling boss (222) extends along the radial direction of the lower impeller (220); Blower motor (300), the output end of the blower motor (300) is connected with the center of the first guide vane (211), the second guide vane (221), the blower motor (300) drives the impeller assembly (200) to rotate; The lower end surface of the first guide vane (211) is convex with first limit edge (212), the upper end surface of the second guide vane (221) is convex with second limit edge (223), the first limit edge (212), the second limit edge (223) all extend along the axial direction of the impeller assembly (200), the end of the first limit edge (212) is abutted on the upper end surface of the second guide vane (221), the end of the second limit edge (223) is abutted on the lower end surface of the first guide vane (211), along the axial direction of the impeller assembly (200), the first guide vane (211) and the second guide vane (221) have gap a between them; The first limit edge (212), the second limit edge (223) are annular, the first limit edge (212) and the second limit edge (223) are mutually nested, the side wall of the first limit edge (212) and the side wall of the second limit edge (223) are mutually abutted, to limit the displacement of the upper impeller (210) along the radial direction of the lower impeller (220); The edge of the second guide vane (221) is convex with third limit edge (224) upward, the root of the third limit edge (224) is connected with the root of the anti-air channeling boss (222), the side wall of the third limit edge (224) is abutted on the edge of the first guide vane (211), to limit the displacement of the upper impeller (210) along the radial direction of the lower impeller (220).

2. The dual stage flow blower of claim 1, wherein, A first wind-blocking table (131) is arranged on one side of the baffle plate (130) facing the impeller assembly (200), and a gap b is formed between the end of the first wind-blocking table (131) and the end of the third limiting edge (224).

3. The dual stage flow blower of claim 2, wherein, A first inclined surface is arranged on one side of the first wind-blocking table (131) facing the anti-wind-leak boss (222), and a second inclined surface is arranged on one side of the anti-wind-leak boss (222) facing the first wind-blocking table (131), the first inclined surface is parallel to the second inclined surface, and a gap c is formed between the first inclined surface and the second inclined surface.

4. The dual stage flow blower of claim 3, wherein, The inclination angle β of the first inclined surface and the second inclined surface ranges from 0° to 75°.

5. The dual stage flow blower of claim 2, wherein, A second wind-blocking table (132) is arranged on one side of the baffle plate (130) facing the impeller assembly (200), and a gap d is formed between the second wind-blocking table (132) and the edge of the anti-wind-leak boss (222) along the radial direction.

6. The dual stage flow blower of any one of claims 1-5, wherein, The lower end surface of the first flow guide plate (211) is provided with a plurality of first reinforcing ribs (216), and the plurality of first reinforcing ribs (216) are uniformly distributed along the radial direction of the first flow guide plate (211); and / or The upper end surface of the second flow guide plate (221) is provided with a plurality of second reinforcing ribs (228), and the plurality of second reinforcing ribs (228) are uniformly distributed along the radial direction of the second flow guide plate (221).

7. An automotive air conditioner characterized by comprising: The double-layer flow blower comprises the double-layer flow blower according to any one of claims 1-6.

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