DE102019202975A1 - Electrically powered fluid machine - Google Patents

Abstract

The invention relates to an electrically driven fluid machine (1), in particular a fluid pump, with a rotating fluid machine element (8), in particular a pump element, which is rotatably driven by an electric motor (10) which comprises a rotor (15) which rotates around a rotor axis (17 ) is rotatable relative to a stator (16), and with a rotary slide valve. In order to improve the electrically driven fluid machine (1) structurally and / or functionally, the rotary slide valve (20) in the electrically driven fluid machine (1) is via a gear ( 30) can be drive-connected to the rotor (15) of the electric motor (10).

Description

The invention relates to an electrically driven fluid machine, in particular a fluid pump, with a rotating fluid machine element, in particular a pump element, which is rotatably driven by an electric motor which comprises a rotor which is rotatable about a rotor axis of rotation relative to a stator, and with a rotary slide valve.

From the European patent specification EP 1 476 645 B1 An electric coolant pump and a method for controlling a valve of an electric coolant pump, in particular for a coolant circuit of automotive internal combustion engines, are known, with a coolant pump motor that drives a pump impeller via a pump shaft, and with a valve integrated in the pump inlet, the required switching work being done by the coolant pump motor and is transmitted via the shaft of the pump motor to the valve, in particular a 3/2-way valve, a valve element designed as a rotary slide element being connected to the pump shaft via a freewheel, and the freewheel only transmitting power to the rotary slide element in the return direction of the cooling pump motor allows. From the German Offenlegungsschrift DE 10 2011 001 090 A1 a controllable cooling system for a motor vehicle is known, comprising: a coolant circuit for supplying and discharging coolant to and from an internal combustion engine of the vehicle; a mechanically operated, controllable main coolant pump, which has a supply for supplying the coolant to the main coolant pump and an outlet for discharging the coolant to the internal combustion engine, and an electrically operated, controllable secondary coolant pump, which has a supply for supplying the coolant in has the secondary coolant pump and a discharge for discharging a coolant conveyed as a bypass coolant flow in the direction of the main coolant pump. From the German patent specification DE 198 09 123 B4 a water pump for the cooling circuit of an internal combustion engine of a motor vehicle is known, with a pump housing and a pump device driven in the pump housing, a control valve being integrated into the pump housing, the control valve having a rotary slide, the rotary slide having at least approximately a sleeve shape and with a axial collection opening is provided for supplying or removing cooling medium to the suction or pressure side of the pumping device. From the German Offenlegungsschrift DE 199 21 421 A1 a pump for a cooling or heating circuit comprising a valve in a motor vehicle is known, the valve being arranged in the housing of the pump, the valve being a controllable rotary slide valve.

The object of the invention is to provide an electrically driven fluid machine, in particular a fluid pump, with a rotating fluid machine element, in particular a pump element, which is rotatably driven by an electric motor which comprises a rotor which is rotatable about a rotor axis of rotation relative to a stator, and with a rotary slide valve to improve constructively and / or functionally.

In the case of an electrically driven fluid machine, in particular a fluid pump, with a rotating fluid machine element, in particular a pump element, which is rotatably driven by an electric motor which comprises a rotor which is rotatable about a rotor axis of rotation relative to a stator, and with a rotary slide valve, thereby solved that the rotary slide valve in the electrically driven fluid machine can be connected in terms of drive to the rotor of the electric motor via a transmission. The electrically driven fluid machine is preferably an electrically driven fluid pump. Then the rotating fluid machine element is preferably a rotating pump element such as an impeller. The pump is designed, for example, as a coolant pump, in particular as a water pump with an impeller. The fluid pump can also be designed as a centrifugal pump. A movement of the rotor can advantageously be used to actuate the rotary slide valve via the transmission.

A preferred embodiment of the electrically driven fluid machine is characterized in that the transmission is combined with a freewheel. The freewheel is designed as a roller freewheel, for example. The freewheel enables a rotational movement of the rotor of the electric motor to be used in normal operation of the electrically driven fluid machine, in particular in pump operation of the fluid pump, to drive the rotating fluid machine element, in particular the pump element. In a reverse direction of rotation, the movement of the rotor can then be used to actuate the rotary slide valve.

Another preferred embodiment of the electrically driven fluid machine is characterized in that the gear is designed as an eccentric gear with an eccentric, the eccentric comprising an eccentric body with a recess. Due to the special design of the eccentric, tolerances in the assembly of the electrically driven fluid machine can be compensated.

Another preferred embodiment of the electrically driven fluid machine is characterized in that the eccentric gear comprises an orbiting internal gear with external teeth which mesh with internal teeth of a rotary valve which is rotatably driven about the rotor axis of rotation. Via the eccentric in its special design, undesired orbiting movements of the internal gear and / or the rotary slide during operation of the electrically driven fluid machine can be effectively compensated for when the rotary slide valve is switched.

Another preferred embodiment of the electrically driven fluid machine is characterized in that the orbiting internal gear is driven by the eccentric. For this purpose, the eccentric is designed in such a way that a desired elastic deformation of the eccentric takes place when a drive movement is transmitted to the internal gear.

Another preferred exemplary embodiment of the electrically driven fluid machine is characterized in that the eccentric is connected in a rotationally fixed manner to a valve drive shaft. The valve drive shaft is advantageously rotatable about the rotor axis of rotation. The eccentric is particularly advantageously firmly connected to the valve drive shaft. A separate mounting for the eccentric can thus be omitted. The fixed connection between the eccentric and the valve drive shaft is, for example, non-positive and / or positive.

Another preferred exemplary embodiment of the electrically driven fluid machine is characterized in that the rotor of the electric motor is non-rotatably connected to the fluid machine element rotating about the rotor axis of rotation via a driver body. The driver body is preferably firmly connected to the rotor of the electric motor. Thus, via the driver body, both a drive movement can be transmitted to the rotating fluid machine element and, in particular, in an opposite direction of rotation, to the eccentric.

Another preferred embodiment of the electrically driven fluid machine is characterized in that the driver body can be connected to the valve drive shaft in a rotationally fixed manner via at least one clamping roller in order to drive the transmission. In a fluid machine operation, in particular in a pump operation, the valve drive shaft represents an axis for the rotating fluid machine element, in particular a pump element. In the other direction of rotation, the driver body can rotate freely on the valve drive shaft.

The above-mentioned object is in an electrically driven fluid machine, in particular fluid pump, with a rotating fluid machine element, in particular pump element, which is rotatably driven by an electric motor which comprises a rotor which is rotatable about a rotor axis of rotation relative to a stator, and with a rotary slide valve , in particular in the case of an electrically driven fluid machine described above, alternatively or additionally achieved in that the rotary slide valve is arranged in an inlet area or intake tract of the electrically driven fluid machine. As a result, the function of the electrically driven fluid machine, in particular the electrically driven fluid pump, is considerably improved compared to conventional applications.

The invention further relates to a fluid machine element, an electric motor, in particular a rotor, a rotary slide valve, a gear, in particular an eccentric gear, a freewheel, in particular a pinch roller, an eccentric, an internal gear and / or a rotary slide for an electrically driven fluid machine described above, especially fluid pump. The parts mentioned can be traded separately.

The invention optionally also relates to a method for operating a previously described electrically driven fluid machine, in particular a fluid pump.

• 1 eine perspektivische Darstellung einer elektrisch angetriebenen Fluidmaschine;
• 2 eine vergrößerte Darstellung der elektrisch angetriebenen Fluidmaschine aus 1 im Längsschnitt;
• 3 eine perspektivische teilweise als Explosionsdarstellung gezeigte Längsschnittansicht der elektrisch angetriebenen Fluidmaschine aus den 1 und 2;
• 4 eine Explosionsdarstellung eines Getriebes mit einem Drehschieberventil und einem Gehäuse der elektrisch angetriebenen Fluidmaschine aus den 1 bis 3;
• 5 die Ansicht eines Querschnitts durch das Getriebe der elektrisch angetriebenen Fluidmaschine; und
• 6 die Darstellung eines weiteren Querschnitts durch einen Freilauf der elektrisch angetriebenen Fluidmaschine.

Further advantages, features and details of the invention emerge from the following description, in which various exemplary embodiments are described in detail with reference to the drawing. Show it:

• 1 a perspective view of an electrically driven fluid machine;
• 2 an enlarged view of the electrically driven fluid machine 1 in longitudinal section;
• 3 a perspective longitudinal sectional view, shown partially as an exploded view, of the electrically driven fluid machine from FIG 1 and 2 ;
• 4th an exploded view of a transmission with a rotary slide valve and a housing of the electrically driven fluid machine from the 1 to 3 ;
• 5 the view of a cross section through the transmission of the electrically driven fluid machine; and
• 6th the illustration of a further cross section through a freewheel of the electrically driven fluid machine.

In the 1 to 6th is an electrically powered fluid machine 1 shown in different views and sections. The electrically powered fluid machine 1 is as a coolant pump with a housing 2 executed. The case 2 includes four housing bodies 3 , 4th , 5 , 6th .

The case body 3 represents a lower cover of the case 2 represent. The lower lid 3 serves, for example, to accommodate an electrical control for an electric motor 10 that is used to drive the electrically powered fluid machine 1 serves. The case body 3 is with an electrical connection 9 Mistake.

The case body 4th serves to accommodate the electric motor 10 . The case body 5 serves to hold a rotating machine element 8th . With the rotating machine element 8th it is an impeller of the electrically driven fluid machine designed as a centrifugal pump 1 .

Between the two housing bodies 4th , 5 is a can 7th arranged. The can 7th serves to separate or encapsulate a stator 16 of the electric motor 10 in the case body 4th compared to the working medium of the fluid machine 1 . One rotor 15th of the electric motor 10 is around an axis of rotation 17th , also called the rotor axis of rotation 17th is referred to, rotatable within the can 7th arranged, the a further housing body of the housing 2 represents.

The case body 6th represents an upper lid of the case 2 with an entrance area 19th the electrically powered fluid machine 1 represent. The top lid 6th is with two intake ports 11 , 12 fitted. Via the intake manifold 11 , 12 controlled by a rotary slide valve 20th , Working medium, especially coolant, sucked into the centrifugal pump.

The rotary slide valve 20th includes a valve drive shaft 21st around the rotor axis of rotation 17th in the case 2 is rotatably mounted. An in 2 upper end of the valve drive shaft 21st is rotatable in the housing body 6th arranged, in particular stored. An in 2 lower end of the valve drive shaft 21st is with an unspecified bearing in the housing body 4th rotatably mounted.

The rotary slide valve 20th includes a rotary valve 22nd that is in the case body 6th around the rotor axis of rotation 17th is rotatably arranged. The rotary valve 22nd is about a gear 30th driving with the rotor 15th of the electric motor 10 connectable. The gear 30th is designed as an eccentric gear and with a freewheel 31 combined.

The rotary valve 22nd can only perform a rotating movement. To prevent the rotary valve from twisting 22nd are in 5 Plastic hook 61 to 63 provided, the radially outside on the rotary valve 22nd attack. The three plastic hooks 61 to 63 serve at the same time to the rotary valve 22nd to guide radially so that it cannot tumble.

The freewheel 31 includes, as can be seen from a synopsis of the 2 and 6th results in a total of three pinch rollers 32 , 52 , 53 . About the freewheel 31 can the valve drive shaft 21st drivingly with a driver body 24 get connected. The driver body 24 in turn is fixed against rotation with the rotor 15th connected.

The driver body 24 is with play on the valve drive shaft 21st arranged. The pinch roller 32 moves when the impeller or impeller is driven, due to centrifugal force radially outwards. The pinch roller takes care of the opposite direction of rotation 32 due to the geometry of the driver body 24 in contact with the valve drive shaft 21st for a torque shortfall from the rotor 15th on the valve drive shaft 21st to create. The gear is driven in one direction of rotation. In the other direction there is free movement of the driver body 24 relative to the valve drive shaft 21st possible.

An eccentric 33 of the eccentric gear 30th is non-rotatable with the valve drive shaft 21st connected. The eccentric 33 is with an eccentric body 40 equipped over which the eccentric 33 driving with an orbiting internal gear 34 of the eccentric gear 30th is connectable. The orbiting internal gear 34 is equipped with an external toothing in which an internal toothing engages on the rotary valve 22nd is trained.

In 5 you can see that the eccentric 33 with the eccentric body 40 a three spoke spoke design 44 , 45 , 46 having. The spokes 44 to 46 serve to represent three flow ranges 41 , 42 , 43 in the eccentric 33 .

The eccentric 33 with the eccentric body 40 and the spokes 44 to 46 is formed from an elastically deformable plastic material. This gives the eccentric 33 a certain flexibility that compensates for orbiting movements of the internal gear 34 or the rotary valve 22nd during operation of the rotary slide valve 20th enables.

A conventional eccentric should not actually compensate for tolerances. A conventional eccentric should in principle precisely specify the movement of a counter element. A conventional one The eccentric is therefore usually rigid. The eccentric body 40 of the eccentric 33 has a kidney-shaped franking or recess 35 . The coolant flows through the flow areas 41 to 43 in the eccentric body axially on the valve drive shaft 21st along. The kidney-shaped recess 35 in the eccentric body 40 serves to compensate for tolerances. The eccentric body 40 gets through the kidney-shaped recess 35 or franking a desired elasticity in connection with the plastic material used, from which the eccentric body 40 is formed. The eccentric body 40 In contrast to conventional eccentrics, it is not a solid component.

The eccentric 33 is torque-proof with the valve drive shaft 21st connected, which is also referred to as the pump axis. The internal gear, also known as the eccentric gear 34 executes an orbiting movement in valve control mode. Its torque is controlled by an anti-twist device 48 on the housing 2 supported. The internal teeth on the rotary valve 22nd represents an internally toothed ring gear of the eccentric gear 30th represent.

The anti-twist device 48 comprises a total of eight knobs with a corresponding play in recesses, in particular through holes, of the orbiting internal gear 34 intervention. This is how the only orbiting internal gear becomes 34 prevented from turning when the eccentric 33 turns. A tooth ratio between the teeth of the internal gear 34 and the rotary valve 22nd is chosen so that the rotary valve 22nd is twisted exactly by one tooth when the eccentric 33 makes a full turn. The play between the anti-twist device 48 and the orbiting internal gear 34 corresponds to double the eccentricity of the eccentric gear 30th .

When the electrically powered fluid machine 1 is designed as a coolant pump, then the rotary slide valve 20th can also be referred to as a coolant switching valve. The coolant pump 1 is together with the coolant valve 20th united in one module. By sharing the electric motor 10 as a drive, an electrical control in the housing body 3 and the connections 9 , 11 to 13 advantages in terms of costs, installation space and mass can be achieved.

When the electric motor 10 rotates against a direction of rotation intended for pumping, then the clamping roller freewheel transmits 31 the shaft power of the electric motor 10 via the compact eccentric gear 30th on the rotary slide valve 20th in the entrance area or intake tract 19th of the module. In this way, the various inlets can be easily adjusted 11 , 12 in the intake tract 19th be controlled.

All transmission parts of the transmission 30th are inexpensive as plastic injection molded parts. The eccentric 33 also has a flexible design, which makes the transmission 30th a reduced tolerance sensitivity receives.

The pump shaft or valve drive shaft 21st which is the transmission input shaft of the transmission 30th represents, stands still during the pump operation and in this operating state serves as an axis on which the rotor 15th is slide bearing. The rotor turns 15th contrary to the operating direction intended for the pump operation, the clamping roller freewheels 31 in the rotor 15th a force fit between the rotor 15th or the pump shaft or valve drive shaft 21st and thus drives the gear or actuating gear 30th on.

The gear ratio of the actuator 30th is, for example, one in ninety, whereby a stable engine run can be ensured during the actuating operation. Lower transmission ratios can be achieved simply by reducing the number of teeth, which enables a faster setting process to be achieved.

The switch positions of the rotary valve 22nd and thus also the alignment of the pump inlets 11 , 12 are freely selectable. In principle, a continuous variation of the valve position and a number of pump inlets are also possible 11 , 12 that is greater than two.

List of reference symbols

1

electrically driven fluid machine

2

casing

3

Housing body

4th

Housing body

5

Housing body

6th

Housing body

7th

Can

8th

rotating fluid machine element

9

electrical connection

10

Electric motor

11

Intake manifold

12

Intake manifold

13

Working connection piece

15th

rotor

16

stator

17th

Rotor axis of rotation

19th

Entrance area

20th

Rotary slide valve

21st

Valve drive shaft

22nd

Rotary valve

23

Locking mechanism

24

Driver body

30th

transmission

31

Freewheel

32

Pinch roller

33

eccentric

34

orbiting internal gear

35

kidney-shaped recess

40

Eccentric body

41

Flow range

42

Flow range

43

Flow range

44

spoke

45

spoke

46

spoke

48

Anti-twist device

52

Pinch roller

53

Pinch roller

61

Plastic hook

62

Plastic hook

63

Plastic hook

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 1476645 B1 [0002]
• DE 102011001090 A1 [0002]
• DE 19809123 B4 [0002]
• DE 19921421 A1 [0002]

Claims (10)

Electrically driven fluid machine (1), in particular fluid pump, with a rotating fluid machine element (8), in particular pump element, which is rotatably driven by an electric motor (10) which comprises a rotor (15) which rotates around a rotor axis (17) relative to a Stator (16) is rotatable, and with a rotary slide valve, characterized in that the rotary slide valve (20) in the electrically driven fluid machine (1) can be connected to the rotor (15) of the electric motor (10) via a gear (30). Electrically powered fluid machine according to Claim 1 , characterized in that the gear (30) is combined with a freewheel (31). Electrically driven fluid machine according to one of the preceding claims, characterized in that the gear (30) is designed as an eccentric gear with an eccentric (33), the eccentric (33) comprising an eccentric body (40) with a recess (35). Electrically powered fluid machine according to Claim 3 , characterized in that the eccentric gear (30) comprises an orbiting internal gear (34) with external teeth which mesh with internal teeth of a rotary valve (22) which is rotatably driven about the rotor axis (17). Electrically powered fluid machine according to Claim 4 , characterized in that the orbiting internal gear (34) is driven by the eccentric (33), which has a certain flexibility in order to enable backlash-free operation of the gear (30). Electrically driven fluid machine according to one of the Claims 3 to 5 , characterized in that the eccentric (33) is non-rotatably connected to a valve drive shaft (21). Electrically powered fluid machine according to Claim 6 , characterized in that the rotor (15) of the electric motor (10) is non-rotatably connected to the fluid machine element (8) rotating about the rotor axis (17) via a driver body (24). Electrically powered fluid machine according to Claim 7 , characterized in that the driver body (24) can be connected to the valve drive shaft (21) in a rotationally fixed manner in one direction of rotation via at least one clamping roller (32) in order to drive the gear (30). Electrically powered fluid machine according to the generic term of Claim 1 , in particular according to one of the preceding claims, characterized in that the rotary slide valve (22) is arranged in an input area (19) of the electrically driven fluid machine (1). Fluid machine element (8), electric motor (10), in particular rotor (15), rotary slide valve (22), gear (30), in particular eccentric gear (30), freewheel (31), in particular clamping roller (32), eccentric (33), internal gear ( 34) and / or rotary slide valve (22) for an electrically driven fluid machine (1) described above, in particular a fluid pump.

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