CN119522325A

CN119522325A - Fan with fan body

Info

Publication number: CN119522325A
Application number: CN202280097487.2A
Authority: CN
Inventors: A·格特; T·罗斯根; P·苏蒂; M·布特罗斯-米哈伊尔
Original assignee: Pierburg GmbH
Current assignee: Pierburg GmbH
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2025-02-25
Also published as: WO2024002469A1

Abstract

The invention relates to a fan (10) comprising a housing (12) on which an intake opening (1232) and an exhaust opening (1212) are formed and which forms a delivery chamber (14), a motor chamber (18) and an electronics chamber (22), wherein the housing (12) is formed such that fluid can be delivered from the intake opening (1232) through the motor chamber (18) and the delivery chamber (14) to the exhaust opening (1212), an impeller (16) which is arranged in the delivery chamber (14), wherein the delivery chamber (14) and the impeller (16) are formed such that fluid is delivered through the delivery chamber (14) when the impeller (16) is rotated, a motor (20) which is arranged in the motor chamber (18) and is configured for driving the impeller (16), and motor electronics (24) which is arranged in the electronics chamber (22) and is configured for controlling the motor (20) to drive the impeller (16), wherein the housing (12) has a pressure equalizing element (1235) which is arranged in fluid communication with the pressure equalizing element (32) via the pressure equalizing element (1235), the pressure equalization element is configured to enable gas exchange between the electronics chamber (22) and the motor chamber (18) through the pressure equalization port (1235) and to prevent liquid from entering the electronics chamber (22) through the pressure equalization port (1235).

Description

Fan with fan body

The invention relates to a fan, in particular for an internal combustion engine, comprising a housing, on which an intake opening and an exhaust opening are formed, and which forms a delivery chamber, a motor chamber and an electronics chamber, wherein the housing is configured such that fluid can be delivered from the intake opening to the exhaust opening through the motor chamber and the delivery chamber, an impeller, which is arranged in the delivery chamber, wherein the delivery chamber and the impeller are configured such that fluid is delivered through the delivery chamber when the impeller rotates, an electric motor, which is arranged in the motor chamber and is configured to drive the impeller in rotation, and motor electronics, which is arranged in the electronics chamber and is configured to control the electric motor to drive the impeller.

Unless otherwise defined, hereinafter, the axial direction is parallel to the rotation axis of the impeller, the radial direction is perpendicular to the rotation axis of the impeller, and the transverse plane is transverse to the rotation axis of the impeller.

Fans of the aforementioned type are known from the document US2016/0238031 A1. The fluid that is conveyed during operation of the fan flows around the motor that is arranged in the motor chamber, as a result of which an effective cooling of the motor is achieved. This allows the fan to remain on for a relatively long time. However, impurities and/or liquids entering the electronics cavity through the sucked fluid flow may cause damage to the motor electronics, thereby affecting the function of the fan and even causing the fan to fail entirely.

Against this background, the technical problem underlying the present invention is to provide a reliable fan which can be operated for a relatively long opening time.

The problem is solved by a fan having the features of independent claim 1.

The fan according to the invention comprises a housing on which the suction opening and the exhaust opening are formed, and which forms a delivery chamber, a motor chamber and an electronics chamber. The housing is configured such that fluid can be transported from the suction opening to the discharge opening through the motor chamber and the transport chamber. In particular, during operation of the fan, fluid is introduced into the housing through the suction opening, is subsequently conveyed through the motor chamber and the conveying chamber, and is finally discharged out of the housing through the discharge opening. In principle, the motor chamber may be arranged upstream and downstream of the transport chamber. Typically, the housing comprises a plurality of housing parts, which preferably abut each other in the axial direction, in order to enable a relatively simple assembly of the fan. In general, an intake connection pipe forming an intake port and an exhaust connection pipe forming an exhaust port are formed on the housing.

The fan according to the invention comprises an impeller arranged in the conveying chamber. The impeller may be, for example, a side channel pump impeller or a radial flow pump impeller. In any event, however, the delivery chamber and impeller are designed such that fluid is delivered through the delivery chamber as the impeller rotates. In general, the delivery chamber and the impeller are particularly designed such that when the impeller rotates, fluid is drawn into the delivery chamber and delivered through the delivery chamber and out of the delivery chamber. In this case, the fluid can be either sucked into the delivery chamber from the motor chamber or discharged from the delivery chamber into the motor chamber. In order to facilitate the installation of the impeller in the transfer chamber, the transfer chamber is preferably formed by two axially connected housing parts.

The fan according to the invention comprises an electric motor arranged in the motor cavity and designed to drive the impeller in rotation. The motor comprises a motor stator and a motor rotor which cooperate in a known manner to drive the motor rotor in rotation. The motor stator preferably comprises at least one electromagnetic stator winding and the motor rotor is permanently magnetized. Typically, the motor is designed as an inner rotor, wherein the motor stator radially surrounds the motor rotor, and the motor is electrically commutated. In principle, however, the electric motor can also be designed as an outer rotor, the motor rotor being rectified radially around the motor stator and/or by a mechanical rectifier. Typically, the impeller is designed to rotate with the motor rotor. Typically, the impeller is connected to the motor rotor by a rotor shaft. However, it is also possible to provide that the impeller is constructed in one piece with the motor rotor.

The fan according to the invention comprises motor electronics arranged in the electronics chamber, which are designed to control the motor in a known manner to drive the impeller. Typically, the motor electronics include a plurality of electronic components and at least one circuit board, the electronic components being mounted on the circuit board. The motor electronics preferably comprise a plurality of power semiconductor switches for electrically rectifying the drive current supplied to the motor.

The housing according to the invention has a pressure equalization opening through which the electronics chamber is in fluid communication with the motor chamber, wherein a pressure equalization element is arranged at the pressure equalization opening, which is designed to effect a gas exchange between the electronics chamber and the motor chamber through the pressure equalization opening and to prevent liquid from entering the electronics chamber from the motor chamber through the pressure equalization opening. Typically, the pressure equalization element comprises a membrane that is permeable to gas but impermeable to liquids and solids. The membrane is arranged in such a way that fluid exchange is only possible between the electronics chamber and the motor chamber via the membrane via the pressure equalization opening.

By means of the pressure equalization port according to the invention, a gas exchange between the electronics chamber and the motor chamber is possible, whereby even if the fan is on for a relatively long time, an overpressure in the electronics chamber which damages the motor electronics can be reliably prevented, despite the motor electronics heating up as a result. The pressure equalization element according to the invention reliably prevents liquids and/or impurities which damage the motor electronics from entering the electronics chamber. According to the invention, the pressure equalization element is arranged inside the housing, whereby the pressure equalization element, which is usually relatively sensitive, is reliably protected from environmental influences, such as splashes of water or debris. The fan thus operates reliably even if the on time is relatively long.

Preferably, the motor chamber is arranged in a flow-through manner between the suction opening and the delivery chamber, whereby the temperature of the fluid to be delivered is particularly low when flowing through the motor chamber. This can effectively cool the motor disposed in the motor cavity.

Preferably, the inlet of the motor chamber in flow terms and the outlet of the motor chamber in flow terms are arranged at different axial heights, so that the fluid to be conveyed flows axially through the motor chamber. It is particularly preferred that the inlet of the motor chamber in terms of flow and the outlet of the motor chamber in terms of flow are arranged on opposite axial sides of the motor, so that the fluid to be conveyed flows completely around the motor. This can effectively cool the motor.

Preferably, a housing part is provided, which forms a housing wall separating the electronics chamber from the motor chamber, said housing part being made of a material having a relatively high thermal conductivity, particularly preferably metal. This may effectively cool the motor electronics arranged in the electronics cavity.

Preferably, the electronics cavity at least partially radially surrounds the motor cavity. This forms a particularly large common housing wall between the electronics chamber and the motor chamber, so that a large amount of heat can be output from the electronics chamber to the motor chamber through the housing wall separating the electronics chamber from the motor chamber. The motor electronics arranged in the electronics chamber can thereby be cooled effectively.

Preferably, the housing wall separates the electronics chamber from the motor chamber, and at least one cooling projection projecting in the direction of the motor electronics is formed on the side of the housing wall facing the electronics chamber, said cooling projection being in thermal contact with the electronics and/or the circuit board of the motor electronics. The thermal contact can be realized by a direct physical contact or by a thermally conductive element, such as a thermally conductive pad or a thermally conductive paste, which is arranged between the cooling projections and the electronic component or the circuit board, wherein the thermally conductive element is in direct physical contact with both the cooling projections and the electronic component or the circuit board. Typically, at least one cooling protrusion is formed on the housing wall section extending substantially in a transverse plane and protrudes axially from the housing wall. There are preferably several types of cooling projections which are in thermal contact with different electronic components and/or circuit board sections of the motor electronics. The power semiconductor elements of the motor electronics usually generate a large amount of waste heat, so that the at least one cooling projection is preferably in thermal contact with the power semiconductor elements of the motor electronics or with a region of the circuit board on which the power semiconductor elements are arranged. The at least one cooling projection forms a material bond and a particularly good heat-conducting connection between the individual components of the motor electronics and the housing wall separating the electronics chamber and the motor chamber, around which the fluid to be transported flows on the motor chamber side. This makes it possible to achieve particularly effective cooling, in particular of components of the motor electronics which generate greater heat during operation.

Preferably, the housing forms an intake channel surrounding the intake opening, and the housing is configured such that the intake channel and the electronics chamber have a common housing wall section. The particularly low-temperature fluid flows around the common housing wall section on the suction channel side, whereby the motor electronics arranged in the electronics chamber can be cooled effectively.

In order to achieve a particularly large delivery flow, the delivery chamber and the impeller are preferably configured such that they form a side channel delivery unit. The transport chamber here comprises at least one side channel. The delivery chamber preferably comprises two axially opposite side channels between which the impeller is arranged. The two side channels are preferably formed by two different housing parts.

According to the invention, the motor space is flown through by the fluid to be fed and thus the electric motor arranged in the motor space is effectively cooled, so that the fan can be equipped with an especially powerful electric motor, wherein the motor stator of the electric motor comprises at least one stator winding, preferably at least six stator windings.

Embodiments of the present invention are described below with reference to the accompanying drawings. In the drawings:

fig. 1 shows a side view of a fan according to the invention in a sectional view, and

Fig. 2 shows a top view of the delivery chamber of the fan in a sectional view.

The fan 10 according to the invention is shown with a housing 12, which is formed from a first housing part 121, a second housing part 122, a third housing part 123 and a fourth housing part 124, which are arranged axially one above the other and each consist of metal. The first housing part 121 and the second housing part 122 form the delivery chamber 14 in which the impeller 16 is arranged. The second housing part 122 and the third housing part 123 form a substantially cylindrical motor chamber 18 in which the electric motor 20 is arranged. The third and fourth housing parts 123, 124 form the electronics chamber 22 in which the motor electronics 24 are disposed, and the electronics chamber includes a substantially annular chamber region 221 radially surrounding a first axial end region of the motor chamber 18.

An intake manifold 1231 is formed on the third housing part 123, which forms an intake duct 1239 having an intake opening 1232. The suction channel 1239 communicates with a first axial end region of the motor cavity 18 facing the electronics cavity. The third housing part 123 is designed in such a way that the suction channel 1239 and the electronics chamber 22 have a common housing wall section 1233.

An exhaust connection 1211 is formed on the first housing part 121, which forms an exhaust channel 1213 with an exhaust opening 1212. The exhaust channel 1213 is connected to the delivery chamber 14.

A passage 1221 is configured in the second housing component 122 that fluidly communicates the delivery chamber 14 with the motor chamber 18 such that fluid may be delivered from the intake port 1232 to the exhaust port 1212 through the intake passage 1239, the motor chamber 18, the delivery chamber 14, and the exhaust passage 1213. Thus, the flow-wise inlet 181 of the motor chamber 18 formed by the suction channel 1239 and the flow-wise outlet 182 of the motor chamber 18 formed by the passage 1221 are arranged in mutually opposite axial end regions of the motor chamber 18 such that the substantially completely conveyed fluid of the motor chamber 18 flows through in axial direction.

In the third housing part 123, in particular in a housing wall 1234 of the third housing part 123 separating the electronics chamber 22 from the motor chamber 18, a pressure equalization opening 1235 is formed, which fluidly connects the electronics chamber 22 to the motor chamber 18. At the pressure equalization port 1235, a pressure equalization element 32 is arranged, which is configured such that a gas exchange between the electronics chamber 22 and the motor chamber 18 can be achieved through the pressure equalization port 1235, but liquid is prevented from entering the electronics chamber 22 from the motor chamber 18 through the pressure equalization port 1235. In this embodiment, the pressure equalization member 32 is a gas permeable, liquid impermeable membrane that is disposed directly over and completely covers the pressure equalization port 1235 such that fluid communication between the electronics chamber 22 and the motor chamber 18 through the pressure equalization port 1235 may occur completely through the membrane.

On the third housing part 123, in particular on the side of the housing wall 1234 separating the electronics chamber 22 from the motor chamber 18 facing the electronics chamber 22, a plurality of cooling projections 1236 are formed, which project in the direction of the motor electronics 24 arranged in the electronics chamber 22. Furthermore, cooling protrusions 1237 are also formed on the common housing wall section 1233 between the suction channel 1239 and the electronics cavity 22.

In the present exemplary embodiment, the impeller 16 and the delivery chamber 14 are designed such that they form a side channel delivery unit 26, which is configured in a known manner to deliver fluid through the delivery chamber 14 when the impeller 16 rotates. The impeller 16 includes a plurality of impeller blades 161 distributed and arranged along the circumferential direction thereof. The delivery chamber 14 comprises a first side channel 141, which is arranged on a first axial side of the impeller 16 facing away from the motor 20 and is formed by the first housing part 121, and a second side channel 142, which is arranged on a second axial side of the impeller 16 facing toward the motor 20 and is formed by the second housing part 122. The impeller 16 is fixed to a drive shaft 28 rotatably supported in the housing 12.

The motor 20 includes a motor stator 201 fixed in the housing 12 and a motor rotor 202 fixed on the drive shaft 28. The motor stator 201 comprises a laminated stator base 2011, on which in the present embodiment six stator windings 2012 are arranged. The motor rotor 202 has permanent magnetism. The motor stator 201 and motor rotor 202 interact in a known manner to rotationally drive the motor rotor 202, and thus the drive shaft 28, by appropriate control of the stator windings 2012. The winding heads 2013 of the stator windings 2012 extend axially through openings 1238 configured in the third housing part 123 into the electronics cavity 22, wherein the gaps between the winding heads 2013 and the third housing part 123 are each sealed by a seal 30.

The motor electronics 24 includes a circuit board 241 on which a plurality of electronic components, not shown, are mounted. The motor electronics 24 are electrically connected with the winding heads 2013 of the stator windings 2012 and are arranged to control the winding heads 2013 in a known manner to drive the motor rotor 202 and thereby the impeller 16. The motor electronics 24 are arranged in the electronics chamber 22 such that the circuit board 241 and/or the electronic components arranged thereon are in direct thermal contact with the cooling protrusions 1236, 1237. Advantageously, the power semiconductor elements of the motor electronics are arranged on the region of the circuit board 241 in direct thermal contact with the cooling projections 1236, 1237 and/or the power semiconductor elements are arranged in direct thermal contact with the cooling projections 1236, 1237.

List of reference numerals

10. Fan with fan body

12. Shell body

121. First housing part

1211. Exhaust connecting pipe

1212. Exhaust port

1213. Exhaust passage

122. A second housing part

1221. Passage way

123. Third housing part

1231. Suction connecting pipe

1232. Suction port

1233. Shared housing wall section

1234. Housing wall

1235. Pressure balance port

1236. Cooling protrusion

1237. Cooling protrusion

1238. An opening

1239. Suction channel

124. Fourth housing part

14. Delivery chamber

141. First side channel

142. Second side channel

16. Impeller wheel

161. Impeller blade

18. Motor cavity

181. Inlet in flow technology

182. Flow-technology outlet

20. Motor with a motor housing having a motor housing with a motor housing

201. Motor stator

2011. Stator matrix

2012. Stator winding

2013. Winding end

202. Motor rotor

22. Electronic device cavity

221. Annular chamber region

24. Motor electronic device

241. Circuit board

26. Side channel conveying unit

28. Driving shaft

30. Sealing element

32. Pressure balance element

Claims

1. A fan (10), comprising:

-a housing (12) on which an intake opening (1232) and an exhaust opening (1212) are formed, and which forms a delivery chamber (14), a motor chamber (18) and an electronics chamber (22), wherein the housing (12) is configured such that fluid can be delivered from the intake opening (1232) through the motor chamber (18) and the delivery chamber (14) to the exhaust opening (1212),

An impeller (16) arranged within the delivery chamber (14), wherein the delivery chamber (14) and the impeller (16) are configured such that fluid is delivered through the delivery chamber (14) upon rotation of the impeller (16),

-An electric motor (20) arranged within the motor cavity (18) and configured for driving the impeller (16) in rotation, and

Motor electronics (24) disposed within the electronics cavity (22) and configured to control the motor (20) to drive the impeller (16),

Characterized in that the housing (12) has a pressure equalization opening (1235) through which the electronics chamber (22) is in fluid communication with the motor chamber (18), wherein a pressure equalization element (32) is arranged at the pressure equalization opening (1235), which is configured such that a gas exchange between the electronics chamber (22) and the motor chamber (18) can take place through the pressure equalization opening (1235) and liquid is prevented from entering the electronics chamber (22) through the pressure equalization opening (1235).

2. The fan (10) according to claim 1, wherein the motor chamber (18) is arranged flow-technically between the suction opening (1232) and the delivery chamber (14).

3. Fan (10) according to one of the preceding claims, wherein the inlet (181) of the motor chamber (18) in flow technology and the outlet (182) of the motor chamber (18) in flow technology are arranged at different axial heights.

4. Fan (10) according to one of the preceding claims, wherein a housing part (123) made of metal is provided, which housing part forms a housing wall (1234) separating the electronics chamber (22) from the motor chamber (18).

5. The fan (10) according to one of the preceding claims, wherein the electronics cavity (22) at least partially radially surrounds the motor cavity (18).

6. The fan (10) according to one of the preceding claims, wherein a housing wall (1234) separates the electronics chamber (22) from the motor chamber (18), at least one cooling projection (1236) protruding in the direction of the motor electronics (24) being formed on the side of the housing wall facing the electronics chamber (22), said cooling projection being in thermal contact with the electronics and/or the circuit board (241) of the motor electronics (24).

7. Fan (10) according to one of the preceding claims, wherein the housing (12) constitutes a suction channel (1239) surrounding the suction opening (1232) such that the suction channel (1239) and the electronics cavity (22) have a common housing wall section (1233).

8. Fan (10) according to one of the preceding claims, wherein the delivery chamber (14) and the impeller (16) are configured such that the delivery chamber (14) and the impeller (16) constitute a side channel delivery unit (26).

9. The fan (10) according to one of the preceding claims, wherein the motor stator (201) of the motor (20) comprises at least six stator windings (2012).