Housing for providing air cooling for permanent magnet motor of blower

Abstract

A housing for providing air cooling for a permanent magnet motor of a blower is disclosed. According to an embodiment, there is disclosed a housing for providing air cooling for a permanent magnet motor for driving an impeller (210) of a blower (100) to be provided, the housing comprising a cylindrical cavity (211) for accommodating the permanent magnet motor, further comprising: two openings (213, 214) at a first end and a second end of the cavity (211), the air flow guide is used for radially guiding air flow towards the accommodated motor; a first set of cooling channels between and connected to the openings (213, 214) for directing airflow tangentially around the electric machine; and a second set of cooling channels connected to the first set of cooling channels for directing an airflow radially from the exterior of the housing to the first set of cooling channels, where the housing further comprises a diverting channel (105) located on the exterior of the housing, the first and second openings (213, 214) are provided for guiding an air flow between the respective first and second openings (213, 214) on the one hand and the second set of cooling channels on the other hand.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal compressors (also called turbo compressors, blowers or simply fans), and more specifically to a housing for housing a permanent magnet motor for driving a blower impeller so as to provide cooling of the motor with gas.

[0002] The invention also relates to a method of using the housing to cool a permanent magnet motor for driving a blower impeller with a gas, such as air. Background Art

[0003] A blower (or fan for short) is a machine that exchanges energy between a fluid flow and a system of blades that perform a rotational motion. In the case of a fan, the blade system is also called an impeller.

[0004] The impeller provides the flow and is driven, for example, by an electric motor such as a permanent magnet motor. The permanent magnet motor then directly drives the impeller.

[0005] During operation, the engine will generate heat. For reasons of safety and efficiency as well as the longevity of the machine, this heat must be dissipated by providing a cooling system.

[0006] In US 10533560 B2, a direct-driven turbo blower is disclosed, which includes a housing with holes to cool the stator of the engine with air. However, this has the disadvantage that it cannot ensure that the rotor of the engine can also be effectively cooled.

[0007] Therefore, an object of the present invention is to provide a fan housing for accommodating a permanent magnet motor, wherein the motor can be cooled more effectively without compromising the normal operation of the motor. Another object of the present invention is to provide a method for cooling a motor using the disclosed housing. Summary of the invention

[0008] According to the present invention, the above object is achieved in the following manner: According to a first aspect of the present invention, there is provided a housing according to the first claim, the housing being configured to provide air cooling to a permanent magnet motor configured to drive an impeller of a blower, the housing comprising a cylindrical chamber configured to accommodate the permanent magnet motor, and further comprising a housing, the housing comprising:

[0009] - first and second opposing sets of openings, located at first and second ends of the chamber, respectively, the first and second sets of openings being configured to direct airflow radially from the exterior of the housing towards a rotor of the permanent magnet electric machine when housed;

[0010] - a first set of cooling channels on the rotor, the first set of cooling channels being located between and connected to the first set of openings and the second set of openings, the first set of cooling channels being configured to direct airflow axially around the permanent magnet electric machine when housed;

[0011] - a second group of cooling channels connected to the first group of cooling channels, the second group of cooling channels being configured to direct airflow radially from an exterior of the housing to the first group of cooling channels;

[0012] Therein, the housing further comprises a turning channel located outside the shell, the turning channel being configured to guide airflow between an opening in the first group of openings or the second group of openings on the one hand and a second group of cooling channels on the other hand.

[0013] Certain terms or definitions are used to describe the present invention. Here, "direction" is understood to mean along which (imaginary) line one can move, and "pointing" is understood to mean to which side of this line indicated by the direction one can move. The movement is, for example, the movement of an air flow.

[0014] The housing is a housing designed to accommodate a permanent magnet motor, which in turn is configured to drive a blower impeller. This further means that the housing is a housing designed for a blower.

[0015] The housing comprises a cylindrical chamber or chambers in which a permanent magnet motor can be accommodated. It should be further understood that this may also include space for bearings to support the rotor of the motor. In addition, there is space provided for the stator. Around this chamber, there is also a housing that completely surrounds the chamber. This housing includes two opposite openings at both ends of the chamber. In other words, there are two sets of openings at each end. The term "relative" is a geometric term, meaning that the openings are opposite openings, preferably 180° opposite to each other. Each set of these opposite openings is configured to guide the airflow radially from the outside to the rotor of the motor. In other words, this means that the airflow can be blown perpendicular to the axial direction of the rotor, and this is done at both ends. It should be further understood that, as will be further explained, one opening in each set of openings will be used to guide the airflow from the outside of the housing to the rotor, and the corresponding opposite opening will be used to guide the airflow from the rotor back to the outside.

[0016] In addition, as discussed above, the housing includes a first set of cooling channels located between the two sets of openings, wherein the cooling channels are connected to the openings at the rotor. The cooling channels run around the chamber so that when the engine is housed in the chamber, the cooling channels run around the engine in an axial and tangential direction. In addition, there is a second set of cooling channels connected to the cooling channels in the first set of cooling channels, the second set of cooling channels being configured to direct airflow radially from the exterior of the housing to the cooling channels in the first set of cooling channels.

[0017] Furthermore, according to a novel innovative feature, the housing includes a steering channel located on the exterior of the housing, the steering channel being configured to direct an airflow between an opening in the first or second set of openings on the one hand and a second set of cooling channels on the other hand. Depending on the direction and orientation of the airflow, as will be further explained, the airflow may then be directed from the first or second set of openings to a cooling channel in the second set of cooling channels, or vice versa. As described below, the airflow may then follow a path along and around the permanent magnet electric machine and along an air gap between the rotor and the stator.

[0018] According to a first possibility, the airflow is blown through a first opening in the first set of openings. This causes the airflow to be blown radially toward the rotor, the airflow further flowing through the opposite opening in the first set of openings. At the second opening, the airflow then flows radially away from the motor to the outside of the housing. By providing a turning channel, the airflow will then be forced to flow further through the cooling channels in the second set of cooling channels, which are then connected to the cooling channels in the first set of cooling channels. This forms an airflow around and along the permanent magnet motor. According to a second possibility, the air is initially blown through the openings in the second set of openings, but the airflow follows the same path flow, so that with this second possibility, the air also circulates around the motor.

[0019] According to one embodiment, the housing further comprises an airflow blocking portion, the airflow blocking portion being configured to hinder the passage of an airflow at a predetermined pressure. For example, the predetermined pressure is greater than 100 mbar, but it should be noted that this specified value should not be understood as limiting, but other values ​​are also possible. There are two possibilities for the placement of the airflow blocking portion.

[0020] According to a first embodiment, an airflow blocking portion is placed on the outside of the housing at an opening in the first set of openings or the second set of openings, thereby forcing the airflow to flow to the air gap between the rotor and the stator of the permanent magnet motor when accommodated, and the air gap extends axially between the first set of openings and the second set of openings.

[0021] According to a second embodiment, an airflow blocking portion is placed on the outside of the housing between the first set of openings and the second set of openings, so that the airflow is blocked at the second set of external cooling channels, so that the airflow is directed tangentially around the motor and towards the air gap between the rotor and the stator of the permanent magnet motor when housed, which air gap again extends axially between the first set of openings and the second set of openings.

[0022] According to these two embodiments, the airflow will be forced to flow through the air gap between the stator and the rotor of the permanent magnet motor, which provides effective cooling of the rotor surrounding and the rotor. In other words, the airflow will flow axially between the stator and the rotor.

[0023] Using such a housing according to these embodiments, the permanent magnet motor can be cooled according to different methods. Using two sets of openings, cooling channels, turning channels and airflow blocking parts, different configurations can be used to cool the motor. According to a second aspect of the present invention, a method for cooling a permanent magnet motor using the housing according to the first aspect of the present invention is also disclosed.

[0024] In the process of driving the impeller of the blower by the permanent magnet motor, the rotor of the machine will have a higher temperature than the stationary parts of the blower. However, with the housings and methods known in the prior art, it is not possible to directly cool this rotor. Therefore, as will be discussed further, an advantage of the present invention is that the permanent magnet motor can be cooled directly and therefore efficiently.

[0025] A first method of cooling a permanent magnet motor configured to drive a blower impeller using a housing according to the first aspect of the invention comprises the following steps:

[0026] - providing a first air flow at a first opening of the first set of openings;

[0027] - diverting the first airflow at an opening opposite to the first opening by means of and in accordance with a diverting channel;

[0028] - providing a second air flow at a first opening of said second set of openings;

[0029] - blocking the second airflow using and according to the airflow blocking portion;

[0030] The openings in the second group of openings are located at a side away from the impeller when assembled, and the power of providing the second airflow is greater than the power of providing the first airflow.

[0031] To implement the method, an airflow blocker is placed outside the housing at an opening in the second set of openings, thereby forcing airflow to flow toward an air gap between a rotor and a stator of the permanent magnet motor when housed.

[0032] The first airflow is provided by the first fan, and the second airflow is provided by the second fan. The first airflow is blown into the opening in the first group of openings by the fan. Then, the airflow is turned to the cooling channel group through the turning channel, and the cooling channel guides the airflow radially from the outside of the housing to the inside. When the airflow is directed to the inside, the airflow flows to the first group of cooling channels again, so as to then let the airflow flow tangentially and axially, that is, flow around the rotor of the permanent magnet motor. In addition, the first airflow from the first fan will leave the housing along the second group of cooling channels on the side opposite to the side where the turning channel is located. At the same time, the second airflow is provided at the opening of the second group of openings by the second fan. The second airflow then flows to the opening, wherein the airflow blocking portion forces the second airflow to flow axially to the opening in the first group of openings along the rotor of the permanent magnet motor through the air gap between the stator and the rotor. Then, the second airflow is connected to the first airflow, and then also flows along the above-mentioned path.

[0033] It should be further understood that the set of cooling passages between the first set of openings and the second set of openings on both sides of the housing may include openings from which the conduits pass to and around the engine.

[0034] Furthermore, when the second set of openings is located on a side away from the impeller when assembled, the power of providing the second airflow is greater than the power of providing the first airflow. In other words, when the housing includes a permanent magnet motor, and the housing is further assembled with the impeller to form a blower, the power of the second fan is more powerful than the power of the first fan. For example, for illustration, the second fan has a power of 800 watts, while the first fan has a power of 600 watts. However, it should be noted that other values ​​are possible and may depend on the power of the permanent magnet motor and, therefore, the power of the blower.

[0035] The airflows can be provided in different ways. The direction of the first airflow is parallel to the direction of the second airflow, and even more preferably, the directions are the same.

[0036] A second method of cooling a permanent magnet motor configured to drive a blower impeller using a housing according to the second aspect of the invention comprises the following steps:

[0037] - providing a first air flow at the second set of cooling channels;

[0038] - redirecting the first airflow to an opening in the first set of openings using a redirecting channel;

[0039] - providing a second air flow at openings in the second set of openings;

[0040] - blocking the second airflow using and in accordance with the airflow blocking portion; and

[0041] The openings in the second group of openings are located at a side away from the impeller when assembled, and the power of providing the second airflow is greater than the power of providing the first airflow.

[0042] To apply this method, the airflow blocking portion is placed just as in the previous method, thus placed on the exterior of the housing at the openings in the second set of openings, directing the airflow towards the air gap between the rotor and stator of the permanent magnet motor when housed.

[0043] Similarly, according to the method, the first airflow is provided by the first fan, and the second airflow is provided by the second fan. In this case, the first fan is placed between the two groups of openings and points to the second group of cooling channels. Therefore, the air is then blown into the housing radially through the cooling channels in the second group of cooling channels, and then guided around the rotor in the tangential and axial directions via the cooling channels in the first group of cooling channels. At the same time, a second airflow is provided at the opening in the second group of openings, and the second airflow is blocked by and according to the airflow blocking portion. This means that the second airflow is forced to flow through the air gap between the rotor and the stator in the axial direction, and this flows from the opening in the second group of openings to the opening in the first group of openings. When assembled in the housing, the second group of openings is positioned away from the impeller, so the first group of openings is positioned adjacent to the impeller. In addition, the power of the second airflow is greater than the power of the first airflow. This forces the airflow to reach the first group of openings through the turning channel and the air blocking portion, and the air that has absorbed heat then leaves the housing at the first group of openings.

[0044] Preferably, in the case of this method, the directions of the first air flow and the second air flow are parallel but directed in opposite directions.

[0045] A third method of cooling a permanent magnet motor configured to drive a blower impeller using a housing according to the first aspect of the invention comprises the following steps:

[0046] - providing a first airflow to the second set of cooling channels;

[0047] - redirecting the first airflow to an opening in the second set of openings using a redirecting channel;

[0048] - blocking the diverted first airflow at openings opposite to the second set of openings using and in accordance with an airflow blocking portion;

[0049] - providing a second airflow at an opening in the first set of openings; and

[0050] The second group of openings is located at a side away from the impeller when assembled, and the power of providing the first airflow is greater than the power of providing the second airflow.

[0051] Similarly, the first airflow is provided by the first fan, and the second airflow is provided by the second fan. Here, the first fan is placed between the two groups of openings and points to the cooling channel in the second group of cooling channels. In this method, the first airflow is turned to the opening in the second group of openings using a turning channel, and the turning channel is located on the other side of the housing that is different from the side where the first airflow is blown between the openings in the cooling channel. Note that the turning channel here is located between the middle of the two groups of openings and the second group of openings. In this second group of openings, in addition to the turning channel, the airflow blocking portion is also located on the opposite side. Therefore, the turned air is blocked and forced to flow to the air gap between the rotor and the stator, flowing to the first group of openings. Then, the second airflow is provided at the opening in the first group of openings by the second fan. The second airflow then flows transversely to the axial direction of the rotor when accommodated, and then provides partial suction of the airflow from the first fan.

[0052] Preferably, in the method just discussed, the direction of the second air flow is parallel to and opposite to the direction of the first air flow.

[0053] A fourth method of cooling a permanent magnet motor configured to drive a blower impeller using a housing according to the first aspect of the invention comprises the following steps:

[0054] - providing a first air flow at an opening in the first set of openings;

[0055] - providing a second air flow at openings in the second set of openings;

[0056] - using and diverting the second airflow according to the diverting channel;

[0057] - using and blocking the diverted second airflow according to the airflow blocking portion;

[0058] The second group of openings is located at a side away from the impeller when assembled, and the power of providing the second airflow is greater than the power of providing the first airflow.

[0059] As in the previous method, the first airflow is provided by the first fan. This blows air into the openings in the first group of openings. At the same time, the second fan blows air into the openings in the second group of openings. Then, the second airflow is turned from the opening opposite to this to the cooling channel in the second group of cooling channels. The airflow blocking portion is located on the other side of the housing along which the second airflow is turned. This then forces the turned airflow to flow into the air gap between the rotor and the stator of the permanent magnet motor when accommodated in the axial direction toward the first group of openings. In addition, suction will be generated by the first airflow to circulate the airflow around the rotor to cool the rotor. In addition, the second group of openings is located on a side away from the impeller when assembled, and the power of providing the second airflow is greater than the power of providing the first airflow.

[0060] Preferably, in the method just discussed, the direction of the second air flow is parallel to and opposite to the direction of the first air flow.

[0061] It is further noted that the air flow blocking portion used in the above method restricts the air to a predetermined value, which may be greater than 100 mbar, but may also be other values.

[0062] According to a final embodiment, a method of cooling a permanent magnet motor configured to drive a blower impeller using a housing according to the first aspect of the invention is disclosed, the method comprising the steps of:

[0063] - providing a first air flow at an opening in the first set of openings;

[0064] - providing a second air flow at openings in the second set of openings;

[0065] - providing a third air flow at the second set of cooling channels;

[0066] - blocking the second airflow using and according to the airflow blocking portion;

[0067] The second group of openings is located at a side away from the impeller when assembled, and the power of providing the second airflow is greater than the power of providing the first airflow.

[0068] According to a third aspect, a blower is disclosed, comprising a permanent magnet motor and a housing according to the first aspect of the invention, wherein the permanent magnet motor is configured to drive an impeller of the blower, and the impeller is installed in the blower.

[0069] According to one embodiment, the blower further comprises a first fan located at the first opening and a second fan located at the second opening, the fans being configured to perform one of the methods of the second aspect of the present invention.

[0070] According to one embodiment, the blower further includes an exhaust passage for exhausting the air flow, wherein the exhaust passage is located at an opening different from a position where the turning passage is located. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] The present invention will be further described with reference to the accompanying drawings, in which

[0072] Figure 1 The figure shows a fan according to an embodiment of the present invention;

[0073] Figure 2 schematically illustrates a blower including a cylindrical cavity for housing a permanent magnet motor and indicating air flow paths to illustrate a first method of cooling the permanent magnet motor when housed in said cylindrical cavity;

[0074] Figure 3schematically illustrates a blower including a cylindrical chamber for housing a permanent magnet motor, and indicating airflow paths to illustrate a second method of cooling the permanent magnet motor when housed in the cylindrical chamber;

[0075] Figure 4 schematically illustrates a blower including a cylindrical chamber for housing a permanent magnet motor, and indicating airflow paths to illustrate a third method of cooling the permanent magnet motor when housed in the cylindrical chamber;

[0076] Figure 5 schematically illustrates a blower including a cylindrical chamber for housing a permanent magnet motor and indicating airflow paths to illustrate a fourth method of cooling the permanent magnet motor when housed in the cylindrical chamber;

[0077] Figure 6 A blower is schematically illustrated, the blower comprising a cylindrical chamber for accommodating a permanent magnet motor, and air flow paths are indicated to illustrate a fifth method of cooling the permanent magnet motor when accommodated in the cylindrical chamber. Detailed description of the embodiments

[0078] The present invention will be described with reference to certain embodiments and certain drawings, but the invention is not limited thereto but only by the claims. The drawings described are illustrative only and are not limiting. In the drawings, the dimensions of certain elements may be exaggerated and not drawn to scale for the purpose of illustration. The dimensions and relative sizes do not necessarily correspond to the embodiments of the invention actually implemented.

[0079] In addition, the terms first, second, third, etc. are used in the specification and claims to distinguish between similar elements, and are not necessarily intended to describe a sequential or chronological order. Where appropriate, these terms can be interchanged, and embodiments of the present invention can be implemented in a sequence different from that described or illustrated herein.

[0080] In addition, the terms such as upper, lower, above, below, etc. used in the specification and claims are for illustrative purposes and are not necessarily intended to describe relative positions. The terms used in this manner are interchangeable where appropriate, and the embodiments of the invention described herein can be implemented in orientations other than those described or illustrated herein.

[0081] Furthermore, although the various embodiments are referred to as "preferred embodiments," this should be understood as examples of how the invention may be implemented, and not as limitations on the scope of the invention.

[0082] The term "comprising" used in the claims should not be understood as being limited to the means or steps listed thereafter; the term should not exclude other elements or steps. The term should be understood to indicate the presence of the named features, elements, steps or components mentioned, but should not exclude the presence or addition of one or more other features, elements, steps or components or groups thereof. Therefore, the scope of the expression "a device comprising means A and B" should not be limited to a device consisting of only components A and B. The meaning is that, with respect to the present invention, only components A and B of the device are listed, and the claims should be further understood to include equivalents of these components.

[0083] In addition, the present invention is described with reference to a fan and / or an airflow. Since the airflow is provided by a fan, these references are interchangeable. In other words, a reference to a fan may also refer to an airflow, and vice versa.

[0084] Figure 1 The blower of one embodiment of the present invention is illustrated. The blower 100 comprises a housing configured to accommodate a permanent magnet motor. The blower 100 is a machine for exchanging energy between a fluid flow and a blade system (in this case an impeller) performing a rotational movement. The impeller is located inside the blower 100 and ensures that compressed air is available at the outlet 101 of the blower 100. To this end, an electric motor is used to drive the impeller, which, according to the illustrated embodiment, is a permanent magnet motor. During its operation, i.e. when the permanent magnet motor drives the impeller, the motor will heat up. In order to ensure normal operation, this motor must be cooled. For this purpose, two fans 103 and 104 are used, which are combined with the housing and with the method to be discussed further to cool the rotor and stator of the motor. In addition, there is an exhaust port 102 for discharging air that has absorbed heat. Finally, Figure 1 The deflection channel 105 is shown in FIG. 1 , which, in combination with the opening, cooling channel, air gap and air flow blocking portion, ensures effective cooling. Figures 2 to 6 Discuss this further.

[0085] exist Figures 2 to 6 , a method for cooling a permanent magnet motor while in operation and housed in a fan 100 is described. Figure 2 , shows a cylindrical chamber 211 for accommodating a permanent magnet motor. The rotor is located in the chamber, and the stator 212 is located around the rotor. Reference numeral 210 indicates the position of the impeller driven by the permanent magnet motor. In addition, reference numeral 213 indicates a position referred to as a first set of openings, and reference numeral 214 indicates a position referred to as a second set of openings. It should be noted that the first set of openings 213 is located on the side close to the impeller, and the second set of openings 214 is located away from the impeller side. In addition, Figures 2 to 6The solid arrows and dashed arrows are also marked in the diagram. The solid arrows refer to the first airflow as further discussed, while the arrows drawn with dashed lines refer to the second airflow. Figures 2 to 6 This is true for every picture in the .

[0086] Only refer to Figure 2 , there is a first fan 201 providing a first airflow (thus indicated by a solid arrow) and a second fan 202 providing a second airflow (indicated by a dotted arrow). The first airflow is blown through an opening in the first group of openings 213, directed to the outer shell of the housing via a turning channel indicated by reference numeral 203, along a cooling channel in the second group of cooling channels, around the motor, and then out of the housing again (indicated by reference numeral 206). In addition, the second fan 202 provides a second airflow to an opening in the second group of openings 214. Opposite this fan 202, there is an airflow blocking portion indicated by reference numeral 204. Reference numeral 205 indicates that a portion of the airflow is allowed to pass, but most of the airflow is blocked. This blocking causes the second airflow to be forced to flow through the air gap between the rotor and the stator, indicated by reference numeral 207. The airflow then continues to reach an opening in the first group of openings 213 and merges with the first airflow. Please further note that the power of the second fan 202 in this method is greater than the power of the first fan 201. For example, the second fan 202 has a power of 800 W and the first fan 201 has a power of 600 W. The power mentioned here as an example can also be used for Figures 3 to 6 The method shown in .

[0087] exist Figure 3 In the figure, a second method for cooling a permanent magnet motor is illustrated. According to the method, the first fan 301 is located on the outer shell of the housing to blow the first airflow through the cooling channels in the second group of cooling channels. Then, these radially travel to the inside, surround the motor via the cooling channels in the first group of cooling channels, and then return to the outside relative to the first fan 301 through the housing. Then, the first airflow is turned to the first group of openings through the turning channel 303. In addition, a second fan 302 with a power greater than the first fan 301 is provided, and the second fan blows the second airflow into the openings in the second group of openings. The airflow blocking portion 304 is located in a position opposite to this, and the airflow blocking portion 304 partially blocks the airflow being blown, so that most of the airflow travels axially and tangentially along the air gap 306, and then communicates with the first airflow, and leaves the housing via 305.

[0088] exist Figure 4In the method shown, the first airflow is blown into the opening in the first group of openings by the first fan 401, and the second airflow is blown into the opening in the second group of openings by the second fan 402. Here, the power of providing the second airflow is greater than the power of providing the first airflow. Then, the second airflow turns 404 from the opening in the second group of openings to the external housing, more specifically the second group of cooling channels. In addition, an airflow blocking portion 403 is also provided on the external housing, so that the second airflow is further forced to flow to the air gap 406 between the rotor and the stator, so as to then merge with the first airflow. Then, the first airflow and the second airflow leave the housing at the reference numeral 405.

[0089] exist Figure 5 , the last method of cooling a permanent magnet motor using a housing is illustrated. A fan 501 blows a first airflow into an opening in the first group of openings, and a fan 502 blows a second airflow through an air channel in the second group of air channels to the external housing at a higher power than the first airflow. The second airflow passes through the housing and is turned 505 to an opening in the second group of openings, and an airflow blocking portion 503 is further located there to force the airflow to flow to an air gap 506 to merge with the first airflow and leave the housing at position 504.

[0090] Finally, there is another method, such as Figure 6 As shown, three fans 601-603 are used to cool the engine. In this method, the airflow is blown into the openings in the first group of openings by fan 601. The airflow is blown into the second group of cooling channels by fan 602. Finally, the third airflow is blown into the openings in the second group of openings by fan 603. Depending on the direction of the fan, and therefore depending on the direction and orientation of the various airflows, there may be a turning channel to turn one of the airflows in each airflow. In addition, there is an airflow blocking portion 604 at the opening in the second group of openings, thereby forcing the airflow 605 to flow axially and tangentially along the rotor. Finally, the airflow (part of which is a combination of various airflows) leaves the housing via 606 and 607.

Claims

1. A housing configured to provide air cooling to a permanent magnet motor, the permanent magnet motor comprising a stator and a rotor, the permanent magnet motor being configured to drive an impeller (210) of a blower (100) to provide air cooling, the housing comprising a cylindrical chamber (211) configured to accommodate the permanent magnet motor, and further comprising a housing, the housing comprising: - first and second sets of openings (213, 214) respectively located at first and second ends of the chamber (211), the first and second sets of openings (213, 214) being configured to direct airflow radially from the exterior of the housing towards a rotor of a permanent magnet electric machine when housed; - a first set of cooling channels on the rotor, located between and connected to the first set of openings (213) and the second set of openings (214), the first set of cooling channels being configured to direct airflow axially around the permanent magnet electric machine when housed; - a second group of cooling channels connected to the first group of cooling channels, the second group of cooling channels being configured to direct airflow radially from the exterior of the housing to the first group of cooling channels; The housing further comprises a diverting channel (105) on the exterior of the shell, the diverting channel being configured to direct airflow between openings in the first group of openings (213) or the second group of openings (214) on the one hand and the second group of cooling channels on the other hand.

2. The housing according to claim 1, further comprising an airflow blocking portion (204, 503), the airflow blocking portion being configured to block the flow of airflow at a predetermined pressure, the airflow blocking portion (204, 503) being arranged outside the housing at an opening in the first group of openings (213) or the second group of openings (214), so as to force air into an air gap (207, 506) between a rotor and a stator of the permanent magnet motor when accommodated, the air gap (207, 506) extending axially between the first group of openings (213) and the second group of openings (214).

3. The shell according to claim 1, further comprising an airflow blocking portion (403), which is configured to block the flow of airflow under a predetermined pressure, and the airflow blocking portion (403) is arranged on the outside of the shell between the first group of openings (213) and the second group of openings (214), so that the airflow flowing to the second group of external cooling channels is blocked, so that the airflow is guided tangentially around the permanent magnet motor and directed to the air gap (406) between the rotor and the stator of the permanent magnet motor when it is accommodated, and the air gap (406) extends axially between the first group of openings and the second group of openings. 4 . The housing according to claim 2 , wherein the predetermined pressure at which the airflow blocking portion blocks the airflow is greater than 100 mbar.

5. A method for cooling a permanent magnet motor using the housing according to claim 2, wherein the permanent magnet motor is configured to drive an impeller (210) of a blower (100), the method comprising the following steps: - providing a first air flow (201) at a first opening of the first set of openings; - diverting (203) the first airflow (201) at an opening opposite to the first opening by means of and in accordance with a diverting channel (203); - providing a second air flow (202) at a first opening of the second set of openings; - blocking (204, 205) the second airflow (202) by using and according to the airflow blocking portion (204, 205); The openings in the second group of openings are located on a side away from the impeller when assembled, and the power of providing the second airflow (202) is greater than the power of providing the first airflow (201).

6. A method for cooling a permanent magnet motor using the housing according to claim 2, wherein the permanent magnet motor is configured to drive an impeller (210) of a blower (100), the method comprising the following steps: - providing a first air flow (301) at the second set of cooling channels; - diverting the first airflow (301) to an opening in the first set of openings using a diverting channel (303); - providing a second air flow (302) at openings in the second set of openings; - blocking the second airflow (302) using and in accordance with the airflow blocking portion (304); and The openings in the second group of openings are located on a side away from the impeller when assembled, and the power of providing the second airflow (302) is greater than the power of providing the first airflow (301).

7. A method for cooling a permanent magnet motor using the housing according to claim 2, wherein the permanent magnet motor is configured to drive an impeller (210) of a blower (100), the method comprising the following steps: - providing a first air flow (502) at the second set of cooling channels; - using a diverting channel (505) to divert (505) the first airflow (502) to an opening in the second set of openings; - blocking the diverted first airflow (502) at an opening opposite to an opening in the second set of openings using and in accordance with an airflow blocking portion (503); - providing a second air flow (501) at an opening in the first set of openings; and The second group of openings is located at a side away from the impeller when assembled, and the power of providing the first airflow (502) is greater than the power of providing the second airflow (501).

8. A method for cooling a permanent magnet motor using the housing according to claim 3, wherein the permanent magnet motor is configured to drive an impeller (210) of a blower (100), the method comprising the following steps: - providing a first air flow (401) at an opening in the first set of openings; - providing a second air flow (402) at an opening in the second set of openings; - diverting the second airflow (402) using and in accordance with the diverting channel (404); - blocking the diverted second gas flow (402) using and according to the gas flow blocking portion (403); The second group of openings is located at a side away from the impeller when assembled, and the power of providing the second airflow (402) is greater than the power of providing the first airflow (401).

9. The method according to any one of claims 5 to 8, wherein: The direction of the first airflow (201, 301, 401, 501) is the same as the direction of the second airflow (202, 302, 402, 502).

10. The method according to claim 9, wherein the direction of the first airflow (201, 301, 401, 501) is equal to the direction of the second airflow (202, 302, 402, 502).

11. The method according to claim 9, wherein the direction of the first airflow (201, 301, 401, 501) is opposite to the direction of the second airflow (202, 302, 402, 502).

12. A method for cooling a permanent magnet motor using the housing according to claim 2, wherein the permanent magnet motor is configured to drive an impeller (210) of a blower (100), the method comprising the following steps: - providing a first air flow (601) at an opening in the first set of openings - providing a second air flow (603) at an opening in the second set of openings - providing a third air flow (602) at the second set of cooling channels; - blocking the second airflow (603) by using and according to the airflow blocking portion (604); The second group of openings is located at a side away from the impeller when assembled, and the power of providing the second airflow (402) is greater than the power of providing the first airflow (401).

13. A blower (100), comprising a permanent magnet motor and a housing according to any one of claims 1 to 4, wherein the permanent magnet motor is configured to drive an impeller of the blower (100), and the impeller is accommodated in the blower.

14. The blower (100) according to claim 13, further comprising a first fan (201, 301, 401, 501) located at an opening in the first group of openings and a second fan (202, 302, 402, 502) located at an opening in the second group of openings, the first fan and the second fan being configured to provide airflow according to any one of the methods according to any one of claims 5 to 10.

15. The blower (100) according to any one of claims 13 to 14, further comprising an exhaust passage (206, 305, 405, 504) for exhausting the air flow, wherein the exhaust passage is located at an opening different from a position where the turning passage is located.

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