U.S. patent application number 12/092810 was filed with the patent office on 2008-11-20 for air conditioning compressor comprising a differential pressure control device.
Invention is credited to Thomas Di Vito, Jan Hinrichs, Robert Mager, Willi Parsch, Jurgen Wertenbach.
Application Number | 20080282716 12/092810 |
Document ID | / |
Family ID | 37668450 |
Filed Date | 2008-11-20 |
United States Patent
Application |
20080282716 |
Kind Code |
A1 |
Parsch; Willi ; et
al. |
November 20, 2008 |
Air Conditioning Compressor Comprising a Differential Pressure
Control Device
Abstract
An air conditioning compressor for air conditioning systems in
motor vehicles, wherein the air conditioning compressor at the high
pressure output comprises a check valve and a pressure control
device, for example a pressure control valve or a bursting
disk.
Inventors: |
Parsch; Willi; (Seeheim,
DE) ; Di Vito; Thomas; (Wehrheim, DE) ;
Hinrichs; Jan; (Friedrichsdorf, DE) ; Mager;
Robert; (Munchen, DE) ; Wertenbach; Jurgen;
(Fellbach, DE) |
Correspondence
Address: |
OSTROLENK FABER GERB & SOFFEN
1180 AVENUE OF THE AMERICAS
NEW YORK
NY
100368403
US
|
Family ID: |
37668450 |
Appl. No.: |
12/092810 |
Filed: |
November 4, 2006 |
PCT Filed: |
November 4, 2006 |
PCT NO: |
PCT/EP06/10586 |
371 Date: |
May 6, 2008 |
Current U.S.
Class: |
62/217 |
Current CPC
Class: |
F04B 27/1036 20130101;
F04B 27/1081 20130101; F25B 49/005 20130101; F04B 49/10 20130101;
F04B 49/03 20130101 |
Class at
Publication: |
62/217 |
International
Class: |
F25B 41/06 20060101
F25B041/06 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 9, 2005 |
DE |
10 2005 053 451.1 |
Claims
1. An air conditioning compressor for air conditioning systems in
motor vehicles, the air conditioning compressor at the high
pressure output comprising a check valve and a pressure control
device, for example a pressure control valve or a bursting disk,
wherein the pressure control device is disposed downstream behind
the check valve and that a differential pressure control device is
disposed parallel in to the check valve.
2. The air conditioning compressor according to claim 1, wherein
the differential pressure control device acts in both flow
directions, which is to say both in the flow direction from the air
conditioning compressor into the air conditioning system, and also
in the opposite flow direction.
3. The air conditioning compressor according to claim 1, wherein
the differential pressure control device is a valve device, which
is to say it is reversible and reusable.
4. The air conditioning compressor according to claim 1, wherein
the differential pressure control device is a bursting disk.
5. The air conditioning compressor according to claim 4, wherein
the bursting disk is integrated in the check valve.
6. The air conditioning compressor according to claim 4, wherein
the pressure differential for triggering the bursting disk is
greater than the pressure differential on the check valve.
7. An air conditioning compressor according claim 1, wherein the
differential pressure control device on the high pressure side of
the air conditioning system connects the air conditioning
compressor and the remaining high pressure side of the air
conditioning system, which is to say both system parts, to the
actual pressure control valve.
Description
[0001] The invention relates to an air conditioning compressor for
air conditioning systems in motor vehicles, wherein the air
conditioning compressor comprises a check valve and a pressure
control device at the high pressure outlet.
[0002] Compressors of this type are known. The integration of the
check valve is required to improve the starting behavior of the
displacement-adjustable compressor and to safeguard the
coupling-free drive of the compressor for the switched-off air
conditioning operation. This check valve is installed in the high
pressure region of the system and, at least in the case of a
pressure gradient counter to the throughput direction of the check
valve in the high pressure side, divides the high pressure side
into two partial regions.
[0003] Furthermore, according to the state of the art, a pressure
control valve is integrated on the high pressure side in the air
conditioning compressor, the valve being disposed downstream in
front of the check valve. This means that in the event of a
pressure gradient at the check valve counter to the throughput
direction of the check valve, which is to say during a pressure
increase in the remaining high pressure region of the air
conditioning system, the high pressure cannot be relieved via the
pressure control valve.
[0004] It is therefore the object of the invention to implement an
air conditioning compressor and/or an air conditioning system,
which are not associated with these problems.
[0005] The task is solved by an air conditioning compressor for air
conditioning systems in motor vehicles, wherein the air
conditioning compressor comprises a check valve and a pressure
control device on the high pressure outlet, for example a pressure
control valve or a bursting disk, wherein the pressure control
device is disposed downstream behind the check valve and wherein a
differential pressure control device is disposed in parallel to the
check valve. Preferably an air conditioning compressor is used,
wherein the differential pressure control device acts in both flow
directions, which is to say both in the flow direction from the air
conditioning compressor into the air conditioning system, and also
in the opposite flow direction. This has the advantage that even if
a check valve is used, pressure control is guaranteed for the
entire high pressure region of the air conditioning system upstream
and downstream of the check valve.
[0006] In addition, an air conditioning compressor is preferred,
wherein the differential pressure control device is a valve device,
which is to say a device that is reversible and reusable.
[0007] Furthermore, an air conditioning compressor is preferred,
wherein the differential pressure control device is a bursting
disk.
[0008] A further air conditioning compressor according to the
invention is characterized in that the bursting disk is integrated
in the check valve. Also preferred is an air conditioning
compressor, wherein the pressure differential for triggering the
bursting disk is greater than the pressure differential for the
check valve. This has the advantage that first a pressure increase
beyond the maximum pressure can act at the compressor outlet via
the check valve onto the pressure control valve disposed downstream
thereof. Only if the check valve jams or fails will the
differential pressure control be triggered and connect the elevated
pressure at the compressor outlet to the pressure control valve in
the other part of the high pressure line of the air conditioning
system.
[0009] Furthermore, a compressor is preferred, wherein the
differential pressure control device on the high pressure side of
the air conditioning system connects the air conditioning
compressor and the remaining high pressure part of the air
conditioning system, which is to say both system parts, to the
actual pressure control valve.
[0010] The invention will be explained on the basis of the
figures.
[0011] FIG. 1 is a schematic illustration of the high pressure
region of an air conditioning system, comprising an air
conditioning compressor having a differential pressure control
device.
[0012] FIG. 2 shows the high pressure region of an air conditioning
system comprising a differential pressure control valve.
[0013] FIG. 3 shows the high pressure region of an air conditioning
system comprising a bursting disk integrated in a check valve as
the differential pressure control.
[0014] FIG. 1 shows the high pressure region of an air conditioning
system, including an air conditioning compressor 1. The air
conditioning compressor 1 takes in coolant, compresses it, and then
pumps it via a check valve 3 into an outlet line 11, where the
outer high pressure part of the air conditioning system beings.
Starting at the outlet line 11, the coolant first flows via a gas
cooler 5, then via an inner heat exchanger 7, until it reaches the
expansion valve 9, where the coolant is expanded at lower pressure.
The high pressure region of the air conditioning system thus
transitions into the low pressure region, which is not described
here. The compressor 1 comprises a housing 13, in which both the
check valve 3 and a pressure control device 15 and a differential
pressure control device 17 are disposed. The check valve 13 is
required in order to improve the starting behavior of the
displacement-adjustable compressor 1 and to safeguard the
coupling-free drive of the compressor 1 for the switched-off air
conditioning compressor operation. As a result of the check valve
3, which can have an opening pressure of 2 bar, for example,
directly upon starting a certain pressure level builds in the
compressor 1, which ensures swiveling of the compressor power unit
and therefore immediate operation of the air conditioning
compressor 1. Downstream, behind the check valve 3, a pressure
control device 15, for example in the form of a pressure control
valve or a bursting disk, is disposed, which opens, for example,
when a maximum pressure of about 160 bar is exceeded and prevents
further increase in pressure. This pressure control device 15 thus
also safeguards the maximum pressure of the compressor 1 and the
remaining high pressure part of the air conditioning system to the
expansion valve 9 by means of the check valve 3. However, in the
event that the check valve 3 should jam or fail due to any kind of
system malfunction, a differential pressure control device 17 can
become active, which, for example at a differential pressure of 10
bar in both directions, connects the air conditioning compressor 1
and the remaining high pressure region of the air conditioning
system with each other.
[0015] FIG. 2 shows such a differential pressure control device
configured as a differential pressure valve in a schematic
illustration. In parallel to the check valve 3, a check valve 19
acting in the same flow direction and a check valve 21 acting in
the opposite direction are provided. The valves 19 and 21, for
example, have an opening pressure of 10 bar, so that in the case of
a pressure differential between the air conditioning compressor and
the remaining high pressure region 23 of the air conditioning
system both system parts can be connected to each other at a
pressure differential of 10 bar, and consequently also to the
pressure control valve 15. Advantageously, the opening pressure of
the differential pressure control device, for example 10 bar, is
greater than the differential pressure of the check valve 3 because
in normal operation the valve also fulfills the safety function
with the pressure control valve 15 disposed downstream thereof,
both for the compressor 1 and for the high pressure region 23 of
the air conditioning system.
[0016] The higher pressure differential is particularly necessary
for safeguarding the differential pressure in the event a bursting
disk 25 is used within the check valve 29, as is shown in FIG. 3,
because the bursting disk 25 is not supposed to be destroyed during
normal operation, but instead the check valve 29 with the opening
pressure of about 2 bar is required for the starting and swiveling
of the compressor 1 and is supposed to connect the compressor 1 to
the high pressure region 23 of the air conditioning system. The use
of a bursting disk 25 within the piston 31 of the check valve 29
offers the special advantage that no additional space is required
for the differential pressure control element because it can be
integrated in the existing check valve. During normal operation,
the piston 31 of the check valve 29 inside the valve housing 33 is
pushed into the valve seat 37 by a helical spring 35, wherein the
helical spring 35 keeps the valve 29 closed at a prestressing force
up to an opening pressure of about 2 bar. After the check valve 29
is open, the coolant can be conducted from the compressor 1 via the
line 39 to the outlet line 11 of the air conditioning compressor
into the high pressure region 23 of the air conditioning system. In
the event that the pressure differential of, for example, 10 bar on
the bursting disk 25 is exceeded in one or the other direction, the
bursting disk 25 will break, thereby activating the line 41 between
the air conditioning compressor 1 and the high pressure region 23
of the air conditioning system. Due to the differential pressure
device in the form of the bursting disk 25, thus both system parts
on the high pressure side are connected to the pressure control
valve 15, and thereby secured, in the event the check valve 29 jams
or fails.
LIST OF REFERENCE NUMERALS
[0017] 1 Air conditioning compressor [0018] 3 Check valve [0019] 5
Gas cooler [0020] 7 Inner heat exchanger [0021] 9 Expansion valve
[0022] 11 Outlet line [0023] 13 Compressor housing [0024] 15
Pressure control device [0025] 17 Differential pressure control
device [0026] 19 Check valve [0027] 21 Check valve [0028] 23 High
pressure region of the air conditioning system [0029] 25 Bursting
disk [0030] 29 Check valve [0031] 31 Piston of the check valve 29
[0032] 33 Valve housing [0033] 35 Helical spring [0034] 37 Valve
seat [0035] 39 Line to the outlet line 11 [0036] 41 Line between
the air conditioning compressor 1 and the high pressure region
23
* * * * *