EP3516227A1

EP3516227A1 - System for an utility vehicle comprising a screw compressor and an electric motor

Info

Publication number: EP3516227A1
Application number: EP17780635.3A
Authority: EP
Inventors: Gilles Hebrard; Jean-Baptiste Marescot; Jörg MELLAR; Thomas Weinhold; Hakan Carlsson
Original assignee: Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Current assignee: Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Priority date: 2016-09-21
Filing date: 2017-09-19
Publication date: 2019-07-31
Also published as: BR112019005066A2; WO2018054855A1; KR20190044685A; JP2019529793A; CN109790838A; JP6835974B2; US20190203712A1; CN109790838B; DE102016011442A1; KR102267530B1

Abstract

The invention relates to a system (1) for a utility vehicle comprising a screw compressor (10) and an electric motor (5), said electric motor (5) driving the screw compressor (10). The electric motor (5) is connected to the screw compressor (10) by means of a flange (12) which comprise at least one cooling connection (104, 106) and a cooling channel is provided in the flange (12).

Description

DESCRIPTION

System for a commercial vehicle comprising a screw compressor and an electric motor

The present invention relates to a system for a commercial vehicle comprising a screw compressor and an electric motor.

Screw compressors for commercial vehicles are already known from the prior art. Such screw compressors are used to provide the necessary compressed air for, for example, the braking system of the commercial vehicle.

In this context, in particular oil-filled compressors, in particular also screw compressors are known in which the object is, the

To regulate oil temperature. This is usually done by having an external oil cooler connected to the oil-filled compressor and the oil circuit via a thermostatic valve. The oil cooler is here

Heat exchanger having two separate circuits, wherein the first circuit for the hot liquid, so the compressor oil is provided and the second for the cooling liquid. As a coolant, for example, air,

Water mixtures can be used with an antifreeze or other oil.

This oil cooler must then be connected to the compressor oil circuit via pipes or hoses and the oil circuit must be secured against leakage.

This external volume must also be filled with oil, so that the total amount of oil is increased. This increases the system inertia. In addition, the oil cooler must be mechanically housed and secured, either by surrounding brackets or by a separate holder, which requires additional means of improvement, but also space. From US 4,780,061 a screw compressor with an integrated oil cooling is already known.

Furthermore, the DE 37 17493 A1 discloses a arranged in a compact housing screw compressor system having an oil cooler on the electric motor of the screw compressor.

From DE 10 2010 015 151 A1 a compressor flange for a screw compressor is known.

Furthermore, from US 2014/0190674 A1 a connecting flange for a

Heat exchanger of a motor vehicle having cooling channels.

From DE 102013011 061 B3 is further a heat exchanger with a

Flange connection is known, wherein the flange connection has a connection flange which is a die-cast part and has through-holes produced by casting technology for receiving threaded bolts.

It is the object of the present invention, a system for a commercial vehicle comprising a screw compressor and an electric motor in an advantageous manner, in particular in that a space-saving

Cooling possibility for a generic system can be provided.

This object is achieved by a system for a commercial vehicle comprising a screw compressor and an electric motor with the features of claim 1. Thereafter, it is provided that a system for a commercial vehicle comprises a screw compressor and an electric motor, wherein the electric motor drives the screw compressor, and wherein the electric motor with the

Screw compressor is connected by means of a flange, wherein the flange has at least one cooling connection and wherein in the flange at least one

Cooling channel is provided. The invention is based on the idea of providing a space-saving cooling possibility by providing a connecting element between the screw compressor and the electric motor, which is cooled. As a result, it is no longer necessary to provide air cooling of the electric motor and the screw compressor. Rather, a cooling possibility is created directly at the point where most of the heat development of the system is present. The arrangement of the flange between the electric motor and screw compressor and the fact that at least one cooling channel is provided in the flange, cooling with a suitable cooling fluid can be made possible.

In particular, it can be provided that the flange is a separate component. This makes it possible to easily provide corresponding Kühlkanalgeometrien in the flange can. Both the screw compressor and the electric motor can in this case with regard to the mechanical interface, i. the corresponding flanges are designed or remain standard and do not require any

Modification.

In the flange, the drive shaft can be guided to drive the screw compressor by the electric motor. The resulting heat can thus be easily removed via the flange.

The cooling fluid for the flange can be a water-based cooling fluid, in particular cooling water or a mixture of water and another component, such as water. Methylene Gluckol or another suitable antifreeze.

In addition, it can be provided that the screw compressor for

Compressed air generation is used. In particular, this may be a

Screw compressor, which serves to supply compressed air to a pneumatic brake system of a commercial vehicle. By providing a

Screw compressor with an electric motor, it is possible to enable such a system in the hybrid vehicle in the commercial vehicle sector. A highly efficient system can be provided. The electric motor may have an electric motor flange, which is provided for connection to the flange. The electric motor flange can be a standard electric motor flange of the electric motor. An adaptation is therefore not required, which allows a cost-effective solution.

In particular, it may be provided that the cooling channel of the flange is opened in the mounted state in the direction of the electric motor flange. This allows direct contact of the cooling fluid with at least the part of the electric motor flange. As a result, an efficient heat removal of heat from the electric motor via the electric motor flange and the cooling fluid in the cooling channel of the flange can be made possible.

The seal of the cooling channel can be realized by the assembly of electric motor flange and flange only in the assembled state. This is simply realized that the cooling fluid in the assembled state of the system should come into direct contact at least with parts of the electric motor flange and can.

In particular, it can further be provided that the electric motor does not have a separate cooling channel and / or coolant connections. This ensures that the electric motor does not require any special adjustments, which enables a cost-effective production and installation of the system.

Further details and advantages of the invention will now be based on a in the

Drawings illustrated embodiment will be explained in more detail.

Show it

Fig. 1 is a schematic sectional view of an inventive

Embodiment of an inventive system for a

Commercial vehicle comprising a screw compressor and a

Electric motor;

Fig. 2 is a perspective view of the system in the assembled state; and Fig. 3a, b perspective views of the flange between

Screw compressor and electric motor.

Fig. 1 shows a schematic sectional view of a screw compressor 10 in the sense of an embodiment of the present invention.

The screw compressor 10 has a mounting flange 12 for mechanical attachment of the screw compressor 10 to an electric motor not shown here.

Shown, however, is the input shaft 14, via which the torque from the electric motor to one of the two screws 16 and 18, namely the screw 16 is transmitted.

The screw 18 meshes with the screw 16 and is driven by this.

The screw compressor 10 has a housing 20 in which the essential components of the screw compressor 10 are housed.

The housing 20 is filled with oil 22.

Air inlet side is on the housing 20 of the screw compressor 10 a

Inlet port 24 is provided. The inlet nozzle 24 is designed such that an air filter 26 is arranged on it. In addition, an air inlet 28 is provided radially on the air inlet pipe 24.

In the area between inlet port 24 and the point at which the inlet port 24 attaches to the housing 20, a spring-loaded valve core 30 is provided, designed here as an axial seal. This valve insert 30 serves as a check valve.

Downstream of the valve core 30, an air supply channel 32 is provided, which supplies the air to the two screws 16, 18. On the output side of the two screws 16, 18, an air outlet pipe 34 is provided with a riser 36. In the region of the end of the riser 36, a temperature sensor 38 is provided, by means of which the oil temperature can be monitored.

Provided further in the air outlet area is a holder 40 for an air de-oiling element 42. The holder 40 for the air de-oiling element has in the installed state in the area facing the bottom (as also shown in FIG. 1) the air de-oiling element 42.

Further provided in the interior of the Luftentölelement 42 is a corresponding filter screen or known filter and Ölabscheidevorrichtungen 44, which are not specified in detail.

In the central upper area, relative to the assembled and ready-to-use state (ie as shown in FIG. 1), the holder for the air de-oiling element 40 has a

Air outlet opening 46, leading to a check valve 48 and a

Minimum pressure valve 50 lead. The check valve 48 and the minimum pressure valve 50 may also be formed in a common, combined valve.

Following the check valve 48, the air outlet 51 is provided. The air outlet 51 is connected to correspondingly known compressed air consumers in the rule.

In order to return the oil 22 located and separated in the air de-oiling element 42 back into the housing 20, a riser 52 is provided which has the outlet of the holder 40 for the air de-oiling element 42 when passing into the housing 20 a filter and check valve 54. Downstream of the filter and check valve 54, a nozzle 56 is provided in a housing bore. The oil return line 58 leads back approximately in the middle region of the screw 16 or the screw 18 to supply oil 22 again. In the assembled state of the bottom portion of the housing 20, an oil drain plug 59 is provided. About the oil drain plug 59, a

corresponding oil drain opening are opened, via which the oil 22 can be drained. In the lower region of the housing 20 and the projection 60 is present, to which the Ötfilter 62 is attached. Via an oil filter inlet channel 64, which is arranged in the housing 20, the oil 22 is first passed to a thermostatic valve 66.

Instead of the thermostatic valve 66, a control and / or

Regulation means may be provided by means of which the oil temperature of the oil 22 located in the housing 22 can be monitored and adjusted to a desired value.

Downstream of the thermostatic valve 66 is then the oil inlet of the ötfilters 62, which leads via a central return line 68, the oil 22 back to the screw 18 or the screw 16, but also to the oil-lubricated bearing 70 of the shaft 14. In the region of the bearing 70, a nozzle 72 is provided, which is provided in the housing 20 in connection with the return line 68.

The cooler 74 is connected to the projection 60.

In the upper region of the housing 20 (relative to the mounted state) there is a safety valve 76, via which an excessive pressure in the housing 20 can be reduced. Before the minimum pressure valve 50 is a bypass line 78, which leads to a relief valve 80. About this relief valve 80 by means of a

Connection with the air supply 32 is controlled, air can be returned to the region of the air inlet 28. In this area can not be closer shown vent valve and also a nozzle (diameter reduction of the feeding line) may be provided.

In addition, approximately at the level of the conduit 34 in the outer wall of the housing 20, an oil level sensor 82 may be provided. This oil level sensor 82 may be, for example, an optical sensor and designed and set up so that it can be detected from the sensor signal, if the oil level is above the Öllevelsensors 82 in operation or if the Öllevelsensor 82 is exposed and thereby the oil level has fallen accordingly.

In connection with this monitoring, an alarm unit can also be provided which outputs or forwards an appropriate error message or warning message to the user of the system. The function of the screw compressor 10 shown in FIG. 1 is as follows:

Air is supplied via the air inlet 28 and passes through the check valve 30 to the screws 16, 18, where the air is compressed. The compressed air-oil mixture, which rises by a factor of between 5 and 16 times compression after the screws 16 and 18 through the outlet conduit 34 via the riser 36, is blown directly onto the temperature sensor 38.

The air, which still partially carries oil particles, is then guided via the holder 40 into the air de-oiling element 42 and, provided that the corresponding minimum pressure is reached, enters the air outlet line 51.

The oil 22 located in the housing 20 is maintained at the operating temperature via the oil filter 62 and possibly via the heat exchanger 74.

If no cooling is necessary, the heat exchanger 74 is not used and is not switched on. The corresponding connection is made via the thermostatic valve 68. After the

Purification in the oil filter 64 is supplied via the line 68 oil of the screw 18 or the screw 16, but also the bearing 72. The screw 16 or the screw 18 is supplied via the return line 52, 58 with oil 22, here is the purification of the oil 22 in the air de-oiling 42nd

About the electric motor not shown in detail, which transmits its torque via the shaft 14 to the screw 16, which in turn meshes with the shaft 18, the screws 16 and 18 of the screw compressor 10 are driven.

About the relief valve 80 is not shown in more detail ensures that in the supply line 32 is not the high pressure, for example, in the operating state

On the output side of the screws 16, 18 prevails, can be locked, but that in particular at the start of the compressor in the supply line 32 is always a low inlet pressure, in particular atmospheric pressure exists. Otherwise, with a start-up of the compressor, a very high pressure would initially arise on the output side of the screws 16 and 18, which would overload the drive motor.

Fig. 2 shows in perspective view a view of an inventive

Embodiment of the overall system 1 with the electric motor 5 and the

Screw compressor 10.

FIGS. 3 a and 3b show perspective views of the flange 12 between the screw compressor 10 and the electric motor 5.

As a connecting part between the screw compressor 10 and electric motor 5 is located in the middle of the flange 12th

The flange 12 is formed as a separate component, which between the

Screw compressor 10 and the electric motor 5 is arranged.

The drive shaft 14 is guided through the central opening 100 of the flange 12. The flange 12 has a cooling channel 102.

The cooling channel 102 of the flange 12 is, as can also be seen in detail in FIG. 3 a, open in the direction of the electric motor flange relative to the assembled arrangement.

The seal of the cooling channel 102 is only by assembling

Electric motor flange and flange 12 formed in the assembled state.

The electric motor 5 or the electric motor flange have no cooling channel and no coolant connections.

As further shown in Fig. 2, the coolant of the cooling system of the screw compressor 10 is generally used and circulated via the cooling passage 102 (see Fig. 3a) in the flange 12 and is connected to the cooling ports 104, 106th

connected rubber hoses 108 led to the oil cooler 74.

After cooling the oil, the cooling liquid returns to the vehicle cooling circuit (not shown in detail) and is thereupon via the cooling outlet port 110

connected accordingly.

LIST OF REFERENCE NUMBERS

1 system

5 electric motor

10 screw compressor

12 mounting flange

14 input shaft

16 screws

18 screws

20 housing

22 oil

24 inlet ports

26 air filters

28 air intake

30 valve insert

32 air supply duct

34 air outlet pipe

36 riser

38 temperature sensor

40 holder for an air de-oiling element

42 air deoiling element

44 filter screen or known filter or Ölabscheidevorrichtungen

46 air outlet opening

48 check valve

50 minimum pressure valve

51 air outlet

52 riser

54 Filter and check valve

56 nozzle

58 oil return line

59 Oil drain plug

60 approach

60a outer ring 60b inner ring

62 oil filter

64 oil filter inlet channel

66 thermostatic valve

68 return line

70 bearings

72 nozzle

74 coolers, heat exchangers

76 safety valve

78 bypass line

80 relief valve

82 oil level sensor

100 central opening

102 cooling channel

104 cooling connections

106 cooling connections

108 rubber hose

110 cooling outlet connection

Claims

A system (1) for a commercial vehicle comprising a screw compressor (10) and an electric motor (5), wherein the electric motor (5) drives the screw compressor (10), and wherein the electric motor (5) with the screw compressor (10) by means of a Flange (12) is connected, wherein the flange (12) has at least one cooling connection (104, 106) and wherein at least one cooling channel is provided in the flange (12).

2. System (1) according to claim 1,

characterized in that

the flange (12) is a separate element disposed between the electric motor (5) and the screw compressor (10).

3. System (1) according to claim 1 or claim 2,

characterized in that

in the flange (12) the drive axle for driving the screw compressor (10) by the electric motor (5) is guided.

4. System (1) according to one of the preceding claims,

characterized in that

the cooling fluid for the water-based flange (12) is made, in particular cooling water or a mixture of water and another component, e.g. Methylene glycol, or another suitable antifreeze is used.

5. System (1) according to one of the preceding claims,

characterized in that

the screw compressor (10) is a screw compressor (10) for generating compressed air.

6. System (1) according to one of the preceding claims,

characterized in that the electric motor (5) has an electric motor flange which is provided for connection to the flange (12).

7. System (1) according to one of the preceding claims,

characterized in that

the at least one cooling channel of the flange (12) is open in the direction of the electric motor flange relative to the assembled arrangement.

8. System (1) according to one of the preceding claims,

characterized in that

the seal of the cooling channel is formed by assembling the electric motor flange and flange (12) only in the mounted state.

9. System (1) according to one of the preceding claims,

characterized in that

the electric motor (5) or the electric motor flange has no cooling channel and / or no coolant connections.