U.S. patent application number 16/353755 was filed with the patent office on 2019-07-11 for arrangement for a screw compressor of a utility vehicle.
The applicant listed for this patent is KNORR-BREMSE Systeme fuer Nutzfahrzeuge GmbH. Invention is credited to Gilles HEBRARD, Jean-Baptiste MARESCOT, Joerg MELLAR, Thomas WEINHOLD.
Application Number | 20190211821 16/353755 |
Document ID | / |
Family ID | 59930348 |
Filed Date | 2019-07-11 |
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United States Patent
Application |
20190211821 |
Kind Code |
A1 |
HEBRARD; Gilles ; et
al. |
July 11, 2019 |
Arrangement for a Screw Compressor of a Utility Vehicle
Abstract
An arrangement for a screw compressor of a utility vehicle has
at least one housing part of the screw compressor and a baffle. The
housing component has at least three baffle receptacle recesses,
wherein at least one baffle receptacle recess is arranged outside
an imaginary line connecting the two other baffle receptacle
recesses. The baffle has at least three fingers which, in the
assembled state of the arrangement, are each inserted in a baffle
receptacle recess associated with the respective finger.
Inventors: |
HEBRARD; Gilles; (Muenchen,
DE) ; MARESCOT; Jean-Baptiste; (Muenchen, DE)
; MELLAR; Joerg; (Muenchen, DE) ; WEINHOLD;
Thomas; (Muenchen, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
KNORR-BREMSE Systeme fuer Nutzfahrzeuge GmbH |
Muenchen |
|
DE |
|
|
Family ID: |
59930348 |
Appl. No.: |
16/353755 |
Filed: |
March 14, 2019 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/EP2017/073576 |
Sep 19, 2017 |
|
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|
16353755 |
|
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F04C 18/16 20130101;
F04C 2210/14 20130101; F04C 29/026 20130101; F04C 2240/809
20130101; F04C 29/04 20130101; F04C 29/02 20130101; F04C 2240/80
20130101 |
International
Class: |
F04C 18/16 20060101
F04C018/16; F04C 29/04 20060101 F04C029/04 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 21, 2016 |
DE |
10 2016 011 444.4 |
Claims
1. An arrangement for a screw compressor of a utility vehicle,
comprising: at least one housing component of the screw compressor;
and a baffle plate, wherein the baffle plate is, in an assembled
state, inserted in a clamped fashion in the housing component.
2. The arrangement as claimed in claim 1, wherein the housing
component has at least three baffle plate receiving apertures, at
least one baffle plate receiving aperture is arranged outside an
imaginary line which connects the two other baffle plate receiving
apertures, and the baffle plate has at least three fingers which,
in the assembled state of the arrangement, are inserted in each
case into a baffle plate receiving aperture assigned to the
respective finger.
3. The arrangement as claimed in claim 2, wherein the housing
component is a rotor housing of the screw compressor.
4. The arrangement as claimed in claim 2, wherein the housing
component is a housing cover of the screw compressor.
5. The arrangement as claimed in claim 2, wherein a middle one of
the three baffle plate receiving apertures is arranged outside the
imaginary line that connects the two other baffle plate receiving
apertures.
6. The arrangement as claimed in claim 2, wherein the fingers of
the baffle plate are substantially in alignment in a non-inserted
and non-assembled state.
7. The arrangement as claimed in claim 2, wherein the baffle plate
is, in the inserted and assembled state, as a result of the
insertion of the fingers into the respectively associated baffle
plate receiving apertures, bent such that the baffle plate is held
braced with the clamping action in the housing component.
8. The arrangement as claimed in claim 2, wherein the fingers of
the baffle plate are all arranged at one edge of the baffle plate.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of PCT International
Application No. PCT/EP2017/073576, filed Sep. 19, 2017, which
claims priority under 35 U.S.C. .sctn. 119 from German Patent
Application No. 10 2016 011 444.4, filed Sep. 21, 2016, the entire
disclosures of which are herein expressly incorporated by
reference.
BACKGROUND AND SUMMARY OF THE INVENTION
[0002] The present invention relates to an arrangement for a screw
compressor of a utility vehicle, comprising at least one housing
component of the screw compressor and a baffle plate.
[0003] Screw compressors for utility vehicles are already known
from the prior art. Such screw compressors are used, for example,
to provide the compressed air required for the brake system of the
utility vehicle.
[0004] In this context, in particular oil-filled compressors, in
particular also screw compressors, are known, in the case of which
it is necessary to regulate the oil temperature. This is generally
realized by virtue of an external oil cooler being provided which
is connected to the oil-filled compressor and to the oil circuit
via a thermostat valve. Here, the oil cooler is a heat exchanger
which has two mutually separate circuits, wherein the first circuit
is provided for the hot liquid, that is to say the compressor oil,
and the second circuit is provided for the cooling liquid. As
cooling liquid, use may for example be made of air, water mixtures
with an antifreeze, or another oil.
[0005] This oil cooler must then be connected to the compressor oil
circuit by way of pipes or hoses, and the oil circuit must be
safeguarded against leakage.
[0006] This external volume must furthermore be filled with oil,
such that the total quantity of oil is also increased. The system
inertia is thus increased. Furthermore, the oil cooler must be
mechanically accommodated and fastened, either by way of brackets
situated in the surroundings or by way of a separate bracket, which
necessitates additional fastening means and also structural
space.
[0007] U.S. Pat. No. 4,780,061 has already disclosed a screw
compressor with an integrated oil cooling arrangement.
[0008] Furthermore, DE 37 17 493 A1 discloses a screw compressor
installation which is arranged in a compact housing and which has
an oil cooler on the electric motor of the screw compressor.
[0009] A generic screw compressor is already known for example from
DE 10 2004 060 417 B4.
[0010] In order to be able to better control the movements of the
oil in the screw compressor itself even during driving operation of
the utility vehicle, it is desirable firstly to enable the oil to
reach anywhere in the screw compressor itself for lubrication
purposes but secondly to control the oil sump in terms of its
movement.
[0011] It is therefore the object of the present invention to
advantageously further develop an arrangement for a screw
compressor of a utility vehicle of the type mentioned in the
introduction, in particular such that the assembly of the screw
compressor can be simplified and improved overall.
[0012] This object is achieved according to the invention by an
arrangement for a screw compressor of a utility vehicle having the
claimed features. Provision is made for an arrangement for a screw
compressor of a utility vehicle to comprise at least one housing
component of the screw compressor and a baffle plate, wherein the
baffle plate is, in the assembled state, inserted in clamped
fashion in the housing component.
[0013] The invention is based on the underlying concept of the
fastening of the baffle plate in the housing component of the screw
compressor being realized in a simple and reliable manner. This is
realized in particular by virtue of the baffle plate being held
with clamping action in the housing. For this purpose, a mere
insertion of the baffle plate into the housing component is
sufficient to permit a reliable fastening.
[0014] The housing component advantageously has at least three
baffle plate receiving apertures, wherein at least one baffle plate
receiving aperture is arranged outside an imaginary line which
connects the two other baffle plate receiving apertures, and
wherein the baffle plate has at least three fingers which, in the
assembled state of the arrangement, are inserted in each case into
a baffle plate receiving aperture assigned to the respective
finger. Owing to the fact that the baffle plate receiving apertures
are not in alignment and also do not lie on a line, this
arrangement results in a bending force being exerted on the baffle
plate during the insertion process, such that said baffle plate is
held in clamped fashion in the housing component. The baffle plate
is thus held with clamping action in the housing component and can,
after being inserted into the baffle plate receiving apertures, be
held securely therein owing to the bending force exerted as a
result of the shaping and arrangement of the baffle plate receiving
apertures. Falling out is hereby reliably prevented. Due to the
fastening by way of baffle plate receiving apertures and
correspondingly associated fingers in the baffle plate, simple
production is made possible. Due to the insertion of the baffle
plate into the baffle plate receiving apertures, the assembly
process is furthermore made relatively straightforward. Even
automated fitting and assembly is conceivable and possible.
[0015] Provision may furthermore be made for the housing component
to be the rotor housing of the screw compressor. In this context,
it is advantageous in particular for the baffle plate to be
arranged below the rotors (in relation to the assembled state).
[0016] It is however basically also contemplated for the housing
component to be the housing cover of the screw compressor. By
inserting the baffle plate into a first housing component of the
housing, such as for example the housing cover, it is made possible
for the fastening to be realized only in one single housing
component. Since the baffle plate is hereby already securely held,
a fastening in another housing component of the housing of the
screw compressor is no longer necessary. This fact self-evidently
also applies analogously to an arrangement of the baffle plate and
a fastening of the baffle plate in the rotor housing.
[0017] Provision may furthermore be made whereby the middle of the
three baffle plate receiving apertures is arranged outside the
imaginary line that connects the two other baffle plate receiving
apertures. In this way, it is made possible to realize relatively
simple clamping because, in the middle region, the bending force is
formed which then serves for clamping of the baffle plate in the
baffle plate receiving apertures or in the housing component of the
screw compressor. The bending forces required for the assembly
process, which can be imparted for this purpose, are furthermore
relatively easy to apply because the baffle plate has to be bent in
the middle, and then an insertion can be performed relatively
easily.
[0018] The fingers of the baffle plate may be substantially in
alignment in the non-inserted and non-assembled state. It is
contemplated in particular for the baffle plate, in the non-bent
state, to be a relatively simple flat non-bent or planar plate. By
means of such an arrangement, inexpensive manufacture is made
possible, and an easy application of the required bending forces
for the insertion of the baffle plate into the housing component is
achieved. In particular, provision may be made whereby the baffle
plate is, in the inserted and assembled state, as a result of the
insertion of the fingers into the respectively associated baffle
plate receiving apertures, bent such that the baffle plate is held
braced with clamping action in the housing component. By way of the
braced holding with clamping action, it is reliably achieved that
the baffle plate is blocked in the housing component merely as a
result of the insertion of its three fingers into the associated
baffle plate receiving apertures. Owing to the fact that the
bending promotes the braced holding with clamping action, a
self-securing holding action is achieved in this way.
[0019] The fingers of the baffle plate may all be arranged at one
edge of the baffle plate. Simple manufacture is hereby achieved.
For the insertion of the baffle plate in the housing component, a
single movement is thus sufficient, and an additional adjustment or
insertion into other housing components is not necessary.
[0020] Other objects, advantages and novel features of the present
invention will become apparent from the following detailed
description of one or more preferred embodiments when considered in
conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021] FIG. 1 is a schematic sectional drawing through an exemplary
screw compressor according to the invention.
[0022] FIG. 2 is a perspective view of the rotor housing of the
screw compressor as per FIG. 1.
[0023] FIG. 3 is a perspective view of the baffle plate as per FIG.
2.
[0024] FIG. 4 is a detailed plan view of the baffle plate receiving
apertures in the rotor housing as per the exemplary embodiment in
FIG. 2.
DETAILED DESCRIPTION OF THE DRAWINGS
[0025] FIG. 1 shows, in a schematic sectional illustration, a screw
compressor 10 in the context of an exemplary embodiment of the
present invention.
[0026] The screw compressor 10 has a fastening flange 12 for the
mechanical fastening of the screw compressor 10 to an electric
motor (not shown in any more detail here).
[0027] What is shown, however, is the input shaft 14, by which the
torque from the electric motor is transmitted to one of the two
screws 16 and 18, specifically the screw 16.
[0028] The screw 18 meshes with the screw 16 and is driven by means
of the latter.
[0029] The screw compressor 10 has a housing 20 in which the main
components of the screw compressor 10 are accommodated.
[0030] The housing 20 is filled with oil 22.
[0031] At the air inlet side, an inlet connector 24 is provided on
the housing 20 of the screw compressor 10. The inlet connector 24
is in this case designed such that an air filter 26 is arranged at
said inlet connector. Furthermore, an air inlet 28 is provided
radially on the air inlet connector 24.
[0032] In the region between the inlet connector 24 and the point
at which the inlet connector 24 joins to the housing 20, a
spring-loaded valve insert 30 is provided, which is designed here
as an axial seal.
[0033] The valve insert 30 serves as a check valve.
[0034] Located downstream of the valve insert 30, an air feed
channel 32 feeds the air to the two screws 16, 18.
[0035] At the outlet side of the two screws 16, 18, an air outlet
pipe 34 with a riser line 36 is provided.
[0036] In the region of the end of the riser line 36, a temperature
sensor 38 is provided by which the oil temperature can be
monitored.
[0037] Also provided in the air outlet region is a holder 40 for an
air deoiling element 42.
[0038] In the assembled state, the holder 40 for the air deoiling
element has the air deoiling element 42 in the region facing toward
the base (as also shown in FIG. 1).
[0039] Also provided, in the interior of the air deoiling element
42, is a corresponding filter screen or known filter and oil
separation devices 44, which will not be specified in any more
detail.
[0040] In the central upper region in relation to the assembled and
operationally ready state (that is to say as shown in FIG. 1), the
holder for the air deoiling element 42 has an air outlet opening 46
which lead to a check valve 48 and a minimum pressure valve 50. The
check valve 48 and the minimum pressure valve 50 may also be formed
in one common combined valve.
[0041] The air outlet 51 is provided downstream of the check valve
48.
[0042] The air outlet 51 is generally connected to correspondingly
known compressed-air consumers.
[0043] In order for the oil 22 that is situated and separated off
in the air deoiling element 42 to be returned into the housing 20,
a riser line 52 is provided which has a filter and check valve 54
at the outlet of the holder 40 for the air deoiling element 42 at
the transition into the housing 20.
[0044] A nozzle 56 is provided, downstream of the filter and check
valve 54, in a housing bore. The oil return line 58 leads back into
approximately the central region of the screw 16 or of the screw 18
in order to feed oil 22 thereto again.
[0045] An oil drain screw 59 is provided in the base region, in the
assembled state, of the housing 20. By means of the oil drain screw
59, a corresponding oil outflow opening can be opened, via which
the oil 22 can be drained.
[0046] Also provided in the lower region of the housing 20 is the
attachment piece 60 to which the oil filter 62 is fastened. Via an
oil filter inlet channel 64, which is arranged in the housing 20,
the oil 22 is conducted firstly to a thermostat valve 66.
[0047] Instead of the thermostat valve 66, it is possible for an
open-loop and/or closed-loop control device to be provided by which
the oil temperature of the oil 22 situated in the housing 20 can be
monitored and set to a setpoint value.
[0048] Downstream of the thermostat valve 66, there is then the oil
inlet of the oil filter 62, which, via a central return line 68,
conducts the oil 22 back to the screw 18 or to the screw 16 again,
and also to the oil-lubricated bearing 70 of the shaft 14. Also
provided in the region of the bearing 70 is a nozzle 72, which is
provided in the housing 20 in conjunction with the return line
68.
[0049] The cooler 74 is connected to the attachment piece 60, as
will be discussed in more detail below in FIGS. 2 to 4.
[0050] In the upper region of the housing 20 (in relation to the
assembled state), there is situated a safety valve 76, by which an
excessively high pressure in the housing 20 can be dissipated.
[0051] Upstream of the minimum pressure valve 50, there is situated
a bypass line 78, which leads to a relief valve 80. Via the relief
valve 80, which is activated by way of a connection to the air feed
32, air can be returned into the region of the air inlet 28. In
this region, there may be provided a ventilation valve (not shown
in any more detail) and also a nozzle (diameter constriction of the
feeding line).
[0052] Furthermore, approximately at the level of the line 34, an
oil level sensor 82 may be provided in the outer wall of the
housing 20. The oil level sensor 82 may for example be an optical
sensor, and may be designed and configured such that, on the basis
of the sensor signal, it can be identified whether the oil level
during operation is above the oil level sensor 82 or whether the
oil level sensor 82 is exposed, and thus the oil level has
correspondingly fallen.
[0053] In conjunction with this monitoring, it is also possible for
an alarm unit to be provided which outputs or transmits a
corresponding error message or warning message to the user of the
system.
[0054] The function of the screw compressor 10 shown in FIG. 1 is
as follows.
[0055] Air is fed via the air inlet 28 and passes via the check
valve 30 to the screws 16, 18, where the air is compressed. The
compressed air-oil mixture, which, having been compressed by a
factor of between 5 and 16 downstream of the screws 16 and 18,
rises through the outlet line 34 via the riser pipe 36, and is
blown directly onto the temperature sensor 38.
[0056] The air, which still partially carries oil particles, is
then conducted via the holder 40 into the air deoiling element 42
and, if the corresponding minimum pressure is attained, passes into
the air outlet line 51.
[0057] The oil 22 situated in the housing 20 is kept at operating
temperature via the oil filter 62 and possibly via the heat
exchanger 74.
[0058] If no cooling is necessary, the heat exchanger 74 is not
used and is also not activated.
[0059] The corresponding activation is performed by way of the
thermostat valve 66. After purification in the oil filter 64, oil
is fed via the line 68 to the screw 18 or to the screw 16, and also
to the bearing 72. The screw 16 or the screw 18 is supplied with
oil 22 via the return line 52, 58, and the purification of the oil
22 takes place here in the air deoiling element 42.
[0060] By use of the electric motor (not shown in any more detail),
which transmits its torque via the shaft 14 to the screw 16, which
in turn meshes with the screw 18, the screws 16 and 18 of the screw
compressor 10 are driven.
[0061] By use of the relief valve 80 (not shown in any more
detail), it is ensured that the high pressure that prevails for
example at the outlet side of the screws 16, 18 in the operational
state cannot be enclosed in the region of the feed line 32, and
that, instead, in particular during the start-up of the compressor,
there is always a low inlet pressure, in particular atmospheric
pressure, prevailing in the region of the feed line 32. Otherwise,
upon a start-up of the compressor, a very high pressure would
initially be generated at the outlet side of the screws 16 and 18,
which would overload the drive motor.
[0062] FIG. 2 shows, in a perspective view, the arrangement for the
screw compressor 10 of the utility vehicle having the at least one
housing component, in this case the rotor housing 20a, and the
baffle plate 100.
[0063] Here, the baffle plate 100 has been inserted into the rotor
housing 20a.
[0064] It is basically also contemplated that the housing cover of
the screw compressor 10 may also be used instead of the rotor
housing 20a. In the inserted and assembled state as shown in FIG.
2, the baffle plate 100 has been bent as a result of the insertion
into the rotor housing 20a, such that the baffle plate 100 is held
braced with a clamping action in the rotor housing 20a.
[0065] For this purpose, as shown in FIGS. 3 and 4, it is firstly
the case that fingers 102, specifically three fingers 102, are
arranged on one side on the baffle plate 100.
[0066] Secondly, the rotor housing 20a has three baffle plate
receiving apertures 104.
[0067] Here, the baffle plate receiving apertures 104 are arranged
such that the two outer baffle plate receiving apertures 104 form a
line, and the third baffle plate receiving aperture 104 is arranged
offset in relation to that line. The three baffle plate receiving
apertures 104 are thus not in alignment.
[0068] In other words, the middle of the three baffle plate
receiving apertures 104 is arranged outside the imaginary line that
connects the two other baffle plate receiving apertures 104.
[0069] By use of the fingers 102, the baffle plate 100 is inserted
into the baffle plate receiving apertures 104.
[0070] This holding with clamping action is sufficient to securely
fasten the baffle plate 100 in the rotor housing 20a.
[0071] Due to the offset of the middle baffle plate receiving
aperture 104, the baffle plate 100 is, owing to its stiffness, held
firstly in bent fashion but also with a self-securing action,
because the bending force that is furthermore exerted and the
arrangement of the fingers 102 ensure that the baffle plate 100 is
held braced with clamping action in the rotor housing 20a by way of
its fingers 102 in the baffle plate receiving apertures 104 of the
rotor housing 20a.
LIST OF REFERENCE SIGNS
[0072] 10 Screw compressor [0073] 12 Fastening flange [0074] 14
Input shaft [0075] 16 Screw [0076] 18 Screw [0077] 20 Housing
[0078] 20a Rotor housing [0079] 22 Oil [0080] 24 Inlet connector
[0081] 26 Air filter [0082] 28 Air inlet [0083] 30 Valve insert
[0084] 32 Air feed channel [0085] 34 Air outlet pipe [0086] 36
Riser line [0087] 38 Temperature sensor [0088] 40 Holder for an air
deoiling element [0089] 42 Air deoiling element [0090] 44 Filter
screen or known filter or oil separation devices [0091] 46 Air
outlet opening [0092] 48 Check valve [0093] 50 Minimum pressure
valve [0094] 51 Air outlet [0095] 52 Riser line [0096] 54 Filter
and check valve [0097] 56 Nozzle [0098] 58 Oil return line [0099]
59 Oil drain screw [0100] 60 Attachment piece [0101] 62 Oil filter
[0102] 64 Oil filter inlet channel [0103] 66 Thermostat valve
[0104] 68 Return line [0105] 70 Bearing [0106] 72 Nozzle [0107] 76
Safety valve [0108] 78 Bypass line [0109] 80 Relief valve [0110] 82
Oil level sensor [0111] 100 Baffle plate [0112] 102 Finger [0113]
104 Baffle plate receiving apertures
[0114] The foregoing disclosure has been set forth merely to
illustrate the invention and is not intended to be limiting. Since
modifications of the disclosed embodiments incorporating the spirit
and substance of the invention may occur to persons skilled in the
art, the invention should be construed to include everything within
the scope of the appended claims and equivalents thereof.
* * * * *