Liquid delivery device, sensor cleaning device and vehicle

Abstract

The invention relates to a liquid delivery device having the features of claim (1), a sensor cleaning device having the features of claim (11), and a vehicle having the features of claim (12).

Description

[0001] 202400223

[0002] 1

[0003] Description

[0004] Liquid conveying device, sensor cleaning device and vehicle

[0005] Technical field

[0006] The invention relates to a liquid conveying device, a sensor cleaning device with such a liquid conveying device and a vehicle with such a sensor cleaning device or such a liquid conveying device.

[0007] State of the art

[0008] The publication DE 11 2006 001 140 B4 relates to a system with a suitable heating element to prevent the freezing of a liquid in the system.

[0009] A particular disadvantage of the prior art devices is that devices with electric heating elements consume energy to defrost them. Expansion of a liquid caused by freezing can damage such devices or systems containing such devices.

[0010] Description of the invention, problem, solution, advantages

[0011] The object of the present invention is to provide an alternative liquid conveying device, which is characterized in particular by the fact that no electrical energy is consumed in order to prevent icing-related damage to the pump impeller of the liquid conveying device. A further object is to provide a sensor cleaning device with such a liquid conveying device. Another object is to provide a vehicle with a 202400223

[0012] 2 to provide such a sensor cleaning device or such a liquid conveying device.

[0013] The problem with regard to the liquid conveying device is solved by a liquid conveying device with the features of claim 1.

[0014] One embodiment of the invention relates to a fluid conveying device comprising a drive housing in which an electric drive with a rotor shaft is arranged, and a pump stage housing in which a pump impeller is arranged, wherein the pump impeller is attached to the rotor shaft and connected to the drive, wherein the pump stage housing is movably mounted relative to the pump impeller and / or to the drive housing.

[0015] This overcomes the disadvantages of the current state of the art, at least partially or completely.

[0016] It is particularly advantageous if the drive housing and / or the pump stage housing is designed to be liquid-tight. For this purpose, radial shaft seals can be installed at the points where the rotor shaft passes through.

[0017] Furthermore, it is preferred if the drive housing and / or the pump stage housing is made of plastic.

[0018] Since the pump impeller is preferably attached to the rotor shaft, it is preferred if the pump stage housing is also mounted to be movable relative to the rotor shaft.

[0019] The pump impeller is preferably a radial pump impeller. It is preferably made of plastic, which makes it particularly cost-effective to manufacture.

[0020] It is also advantageous if the electric drive is a permanent magnet synchronous machine. Permanent magnet 202400223

[0021] 3

[0022] Synchronous machines are particularly efficient in their operation. Preferably, the electric drive comprises a stator with a stator winding and a rotor, which includes the rotor shaft and a rotor core with permanent magnets attached to the rotor shaft.

[0023] A preferred embodiment is characterized in that the pump stage housing is movable relative to the pump impeller and the drive housing, in particular only in the extension direction of the rotation axis of the rotor shaft, in particular by means of a guide, and / or that the pump stage housing is connected to the drive housing by means of a guide.

[0024] It is also preferable if the guide is designed as a bolt guide using bolts.

[0025] Furthermore, it is advantageous if the connection formed by means of the guide, in particular the bolt guide, with the drive housing forms a fastening of the pump stage housing to the drive housing.

[0026] Another preferred embodiment is characterized in that the pump stage housing is movable from a target position relative to the pump impeller to a deviation position relative to the pump impeller due to an axial force acting in the extension direction of the rotation axis of the rotor shaft, caused by an icing-related expansion of the fluid to be pumped in the pump stage housing, and that the deviation position in particular deviates from the target position.

[0027] In other words, the target position is the initial position in which the pump stage housing is located relative to the pump impeller when no axial force acts on the rotor shaft. The movement of the pump stage housing into the deviation position is caused primarily by the freezing of the fluid and the associated expansion of the fluid, which alters the relative position between the 202400223

[0028] can change the 4 movable pump stage housings and the pump impeller attached to the rotor shaft.

[0029] Another preferred embodiment is characterized in that the pump stage housing can be moved from the deviation position to the target position by means of a restoring force generated by a spring element when the axial force decreases, ceases, or falls below the axial force, in order to move the pump stage housing back to the target position. In other words, the axial force decreases when the icing melts, which causes the pump stage housing to move back to the target position due to the restoring force.

[0030] Another preferred embodiment is characterized in that the pump stage housing is clamped between the spring element and another spring element, preferably in such a way that the spring elements counteract movements of the pump stage housing from the intended position in the direction of the drive housing and away from the drive housing.

[0031] It is also preferable if each of the spring elements is able to move the pump stage housing back into the desired position if the axial force weakens or ceases, or if the axial force falls below the restoring force of the respective spring element.

[0032] Another preferred embodiment is characterized in that the pump stage housing is movably mounted relative to the drive housing and the pump impeller by means of a guide, in particular such that the pump stage housing is movable towards the drive housing and movable away from the drive housing, and / or that the pump stage housing is connected to the drive housing by means of a guide or the guide. 202400223

[0033] 5

[0034] Another preferred embodiment is characterized in that the pump impeller is fixed in a non-rotatable and / or immovable manner relative to the rotor shaft.

[0035] Another preferred embodiment is characterized in that the rotor shaft and / or the pump impeller is mounted immovably in the direction of extension of the rotation axis of the rotor shaft, with respect to the drive housing and / or with respect to a stator located in the drive housing.

[0036] Another preferred embodiment is characterized in that the pump stage housing, particularly in the desired position, is arranged at a distance from the drive housing.

[0037] Furthermore, it is advantageous if the pump stage housing or drive housing includes a collar that surrounds a gap or space formed by the distance between the pump stage housing and the drive housing in such a way as to prevent the ingress of foreign objects into the gap or space. This contributes to operational reliability.

[0038] Another preferred embodiment is characterized in that the spring elements are designed as helical springs, wave springs or disc springs, that in particular the guide is designed as a bolt, and that preferably the guide, in particular the bolts, is designed as a receptacle or guide for the spring elements by being guided through the spring elements.

[0039] The problem with regard to the sensor cleaning device is solved by a sensor cleaning device having the features of claim 11. The solution relates to a sensor cleaning device with a liquid conveying device according to the invention.

[0040] The task concerning the vehicle is accomplished by a vehicle with the

[0041] Features of claim 12 are solved. The solution relates to a vehicle with a 202400223

[0042] 6 sensor cleaning device according to the invention and / or such a liquid conveying device.

[0043] Advantageous embodiments of the present invention are described in the dependent claims and in the following description of the figures.

[0044] Brief description of the drawings

[0045] The invention will now be explained in detail using exemplary embodiments and with reference to the drawings. The drawings show:

[0046] Fig. 1 shows an embodiment of a vehicle according to the invention, and

[0047] Fig. 2 shows an embodiment of a liquid conveying device according to the invention.

[0048] Preferred embodiment of the invention

[0049] Figure 1 shows an embodiment of a vehicle 1 according to the invention, comprising an embodiment of a sensor cleaning device 2 according to the invention and an embodiment of a liquid conveying device 3 according to the invention. The vehicle 1 is designed as an autonomously operable electric vehicle.

[0050] Figure 2 shows a schematic view of an embodiment of the liquid conveying device 3 according to the invention from Figure 1. The liquid conveying device 3 comprises a drive housing 4 in which an electric drive with a rotor shaft 7 is arranged, and a pump stage housing 5 in which a pump impeller 11 is arranged, the pump impeller 11 being attached to and connected to the rotor shaft 7. The pump stage housing 5 is movably mounted relative to the pump impeller 11 and to the drive housing 4. The pump stage housing 5 is movably mounted due to a force acting in the direction of rotation of the axis 8 of the rotor shaft 7.

[0051] 7

[0052] An axial force, caused by the freezing-induced expansion of the fluid being pumped in the pump stage housing 5, causes the pump stage housing 5 to move from its target position relative to the pump impeller 11 to a deviation position relative to the pump impeller 11. The deviation position differs from the target position. The electric drive is a permanent magnet synchronous machine. A restoring force, generated by a spring element 6, allows the pump stage housing 5 to be moved from the deviation position to the target position when the axial force decreases or falls below the target position. This relative movement of the pump housing 5 prevents freezing-related damage to the pump impeller 11.The pump stage housing 5 is clamped between spring element 6 and another spring element 6, such that the spring elements 6 counteract movements of the pump stage housing 5 from its intended position towards and away from the drive housing 4. The spring elements 6 are designed as wave springs, while the guides 9 are designed as bolts. The guides 9 also serve as receptacles or guides for the spring elements 6 by passing through them.

[0053] The embodiments shown in Figures 1 and 2 are not limiting in nature and serve only to illustrate the inventive concept.

[0054] 202400223

[0055] 8

[0056] Reference symbol list

[0057] 1 vehicle

[0058] 2 Sensor cleaning device 3 Liquid conveying device

[0059] 4 drive housings

[0060] 5 pump stage housing

[0061] 6 spring element

[0062] 7 Rotor shaft 8 Rotation axis

[0063] 9 Leadership

[0064] 10 Peripherals

[0065] 11 Pump impeller

Claims

202400223 9 Patent claims 1. Liquid conveying device (3) comprising a drive housing (4) in which an electric drive with a rotor shaft (7) is arranged, and a pump stage housing (5) in which a pump impeller (11) is arranged, wherein the pump impeller (11) is attached to the rotor shaft (7) and connected to the drive, characterized in that the pump stage housing (5) is movably mounted relative to the pump impeller (11) and / or to the drive housing (4).

2. Liquid conveying device (3) according to claim 1 , characterized in that the pump stage housing (5) is mounted and / or guided relative to the pump impeller (11 ) and to the drive housing (4), in particular only in the extension direction of the axis of rotation (8) of the rotor shaft (7), in particular by means of a guide (9), and / or that the pump stage housing (5) is connected to the drive housing (4) by means of a guide (9).

3. Liquid conveying device (3) according to claim 1 or 2, characterized in that the pump stage housing (5) is movable from a target position relative to the pump impeller (11) to a deviation position relative to the pump impeller (11) due to an axial force acting in the extension direction of the axis of rotation (8) of the rotor shaft (7), caused by an icing-related expansion of the liquid to be conveyed in the pump stage housing (5), and that the deviation position in particular deviates from the target position.

4. Liquid conveying device (3) according to one of the preceding claims, characterized in that the pump stage housing (5) can be moved from the deviation position to the target position by means of a restoring force caused by a spring element (6) when the axial force decreases or falls below the axial force, in order to move the pump stage housing (5) back to the target position. 202400223 10 5. Liquid conveying device (3) according to one of the preceding claims, characterized in that the pump stage housing (5) is clamped between the spring element (6) and a further spring element (6), preferably in such a way that the spring elements (6) counteract movements of the pump stage housing (5) from the intended position in the direction of the drive housing (4) and away from the drive housing (4).

6. Liquid conveying device (3) according to one of the preceding claims, characterized in that the spring element (6) is arranged between the drive housing (4) and the pump stage housing (5), that in particular a further or the further spring element (6) is arranged on a side of the pump stage housing (5) facing away from the drive housing (4), that preferably the further spring element (6) is arranged between the pump stage housing (5) and a periphery (10) of the drive housing (4) or of the pump stage housing (5) or a part of the drive housing (5) that engages behind the pump stage housing (5).

7. Liquid conveying device (3) according to one of the preceding claims, characterized in that the pump impeller (11 ) is fixed in a non-rotatable and / or immovable manner relative to the rotor shaft (7).

8. Liquid conveying device (3) according to one of the preceding claims, characterized in that the rotor shaft (7) and / or the pump impeller (11) is mounted immovably in the direction of extension of the axis of rotation (8) of the rotor shaft (7) with respect to the drive housing (4) and / or with respect to a stator located in the drive housing (4).

9. Liquid conveying device (3) according to one of the preceding claims, characterized in that the pump stage housing (5), in particular in the desired position, is arranged at a distance from the drive housing (4). 202400223 11 10. Liquid conveying device (3) according to one of the preceding claims, characterized in that the spring elements (6) are designed as helical springs, wave springs or disc springs, that in particular the guide (9) are designed as bolts, that preferably the guide (9), in particular the bolts, are designed as a receptacle or guide (9) for the spring elements (6) by being guided through the spring elements (6).

11. Sensor cleaning device (2) with a liquid conveying device (3) according to one of the preceding claims.

12. Vehicle (1 ) with a sensor cleaning device (2) according to claim 11 and / or a liquid conveying device (3) according to any one of claims 1 to 10.

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