DE102017205500A1 - Domestic appliance and method for vibration and / or noise reduced operation of a household appliance - Google Patents

Abstract

The present invention relates to a household appliance (10) having a first fluid circuit (34) and a second fluid circuit (34) for circulating a fluid during operation of the household appliance (10), wherein in the first and second fluid circuit, a compressor (22) with a Low pressure side and is provided with a high pressure side for compressing the fluid. In the first fluid circuit (20), a bypass (28) is further provided, wherein the compressor (22) for vibration and / or noise reduction during operation or during the passage of a predetermined speed interval with the bypass (28) is bridged to a Build up a pressure on the high pressure side counteract. Furthermore, the invention relates to a method for vibration and / or noise reduced operation of a household appliance (10).

Description

The present invention relates to a household appliance with a first and a second fluid circuit for circulating a fluid during operation of the household appliance and a method for vibration and / or noise reduced operation of a household appliance.

In many household appliances compressors are used, which are used for compressing a fluid medium, in particular a refrigerant. Known manner compressors, which require a sufficiently good oil lubrication, for example, used in heat pumps. However, especially in household refrigerators such as refrigerators, the refrigeration cycle with the heat pump is not continuously in operation. When operating the fluid or refrigeration cycle of the compressor is started. In this initial state, however, the compressor does not have good oil lubrication, i. H. the oil is not distributed throughout the compression space of the compressor just for operation. In particular, rotary piston compressors require good oil lubrication for trouble-free operation, with the oil film in the compression chamber and in the corresponding valves damping the noise generated by the work of the compressor. Known manner, the oil is carried by the hollow drive shaft, which has radial holes at defined points. In the drive shaft there is a spiral, which promotes the oil to the holes by the rotation of the shaft. The rotation of the shaft distributes the oil throughout the compression space. The suction of the oil from the oil bath, however, takes some time, causing a higher vibration and / or noise level, especially in the starting phase of the compressor, which has a particularly unpleasant sound compared to the normal operating condition. The length of this starting phase is largely dependent on the viscosity of the oil used to operate the compressor. As is known, the viscosity of an oil is dependent on the ambient temperature, so that at colder ambient temperatures the loud start phase of the compressor in the household appliance lasts longer. Another issue that negatively affects the noise level of the compressor is the pressure differential that the pressure compressor must apply. At high pressure differences, for example, the tolerances of the metallic individual components have a greater effect on the noise level, causing the compressor to "rattle" begins.

In view of the problems just described, the object of the present invention is to provide a household appliance which can be operated with reduced vibration and / or noise. Furthermore, it is the object of the present invention to provide a method for vibration and / or noise reduced operation of a household appliance.

These objects are achieved with a household appliance and a method for vibration and / or noise reduced operation of a household appliance according to respective independent claim. Further advantages and features as well as optional preferred embodiments of the present invention will become apparent from the dependent claims, the following description and attached drawing, preferred embodiments of the household appliance according to preferred embodiments of the method and vice versa, and this even if it is not explicitly stated herein.

According to the invention, the household appliance has a first and a second fluid circuit for circulating a fluid during operation of the household appliance. In the first and second fluid circuits, a compressor having a low pressure side and a high pressure side for compressing the fluid is provided. According to the proposal, a bypass is also provided in the first fluid circuit. Further, according to the proposal, the compressor for vibration and / or noise reduction during operation of the compressor or during the passage of a predetermined speed interval of the compressor with the bypass can be bridged to counteract a build-up of pressure on the high pressure side. In other words, the high pressure side of the compressor may be fluidly connected to the low pressure side thereof via the bypass, thereby short-circuiting the compressor, so to speak. As soon as the compressor is put into operation and / or also during operation, a pressure is built up on the high-pressure side of the compressor by the compressed fluid. Through the bypass can be counteracted such pressure build-up. By-pass disturbing start-up noises, which occur especially with cold compressors, can be avoided. To reduce the increased level of vibration and / or noise, in particular during a start-up phase of the compressor, the pressure build-up on the high pressure side of the compressor is counteracted by bypassing the fluid to the low pressure side of the compressor. Preferably, the first fluid circuit comprises the bypass and the compressor. In the first fluid circuit, the medium to be circulated, in particular a refrigerant, for. As a gas such as isobutane or propane, in certain phases of the compressor or at certain speed intervals of the compressor via the bypass from the high pressure side to the Low-pressure side passed. As a result, a built-up pressure on the high-pressure side is immediately reduced if necessary and fed back to the compressor on the low pressure side or it is avoided from the outset that a pressure on the high pressure side, especially during a startup phase of the compressor, can be established. In bypassing by means of the bypass, the circulating medium therefore flows back through the bypass or at least partially back to the low-pressure side of the compressor.

In particular, during the passage of a predetermined speed interval of the compressor, which is at frequencies at which natural oscillations of the compressor may occur, a noise is particularly high. The proposed bypass noise can be avoided in particular at natural frequencies of the compressor in an advantageous manner, so that a household appliance can be provided, which can be operated quietly and stably.

The compressor preferably forms the second fluid circuit with further components, in particular with an evaporator and a condenser. The second fluid circuit is preferably a functional circuit of the household appliance, in particular a refrigeration cycle. In particular, the evaporator, the condenser and the compressor in the second fluid circuit, in particular for circulating a refrigerant, are connected in series. In the first fluid circuit, the bypass and the compressor are also connected in series. If necessary, in particular during a start-up phase of the compressor or during a passage of specific rotational speed intervals, the first fluid circuit can be connected in parallel to the second fluid circuit. Through the bypass, the circulating fluid can flow either through the actual refrigeration cycle, which comprises the evaporator and the condenser, or through the first fluid circuit.

According to the advantageous embodiments, the bypass by means of a control, in particular for opening and / or closing, controllable. Preferably, the controller is configured to control opening of the bypass during a startup phase of the compressor or while passing certain speed intervals. Preferably, the bypass in an opened state causes the fluid to circulate in the first fluid circuit, while the bypass in a closed state causes the fluid to circulate not in the first fluid circuit but in particular in the second fluid circuit. The control of the open or closed state of the bypass can be controlled by the controller or the controller and / or can be adapted in situ to a detected pressure difference at the compressor.

In particular, during the passage of a certain speed interval, which is at frequencies at which natural oscillations of the compressor may occur, a noise during normal operation is particularly high. The proposed bypass noise can be avoided in particular at natural frequencies of the compressor in an advantageous manner, so that a household appliance can be provided, which can be operated quietly and stably, in particular during a passage of the specific speed interval. By using the bypass, in particular in the range of the predetermined speed interval, the formation of resonances in the range of natural frequencies can be avoided. This in turn allows the household appliance to be operated quietly and stably.

According to one embodiment of the present invention, the bypass comprises at least one valve. Further, the bypass may include a tube or hose with which the bypass is in fluid communication with the compressor. Preferably, the at least one valve is a bistable valve or a conventional solenoid valve.

According to a further aspect, the invention relates to a method for vibration and / or noise reduced operation of a household appliance, wherein the household appliance comprises a first fluid circuit for circulating a fluid during operation of the household appliance. In the first fluid circuit, a compressor is provided with a low pressure side and a high pressure side for compressing the fluid.

According to the proposal, a bypass is also provided in the first fluid circuit. It is further proposed that the compressor be fluidly coupled to the bypass for vibration and / or noise reduction during operation or during passage of a predetermined speed interval to counteract build-up of high pressure side pressure. As soon as the compressor is put into operation and / or also during operation, a pressure is built up on the high-pressure side of the compressor by the compressed fluid. Due to the bypass, it is possible to counteract such pressure build-up, especially during a start-up phase of the compressor or when passing through certain speed intervals.

The bypass has the advantage that a downtime after a compressor stop reduced can be. Through the bypass can almost immediately be a pressure equalization between the high pressure and low pressure side. In the present case, "virtually immediately" encompasses a time interval of 1 second to 3 seconds. This provides an improvement over the use of a non-bypass compressor in which a pressure reduction lasts about 3 minutes.

The compressor with an evaporator and a condenser preferably forms a second fluid circuit. In particular, the evaporator, the condenser and the compressor in the second fluid circuit are connected in series. In the first fluid circuit, the bypass and the compressor are also connected in series. During operation of the household appliance, the first and the second fluid circuit can be operated in parallel. When circulating the fluid in the first fluid circuit, the fluid may optionally be directed to the low pressure side via the bypass, i. H. be bridged. In the present case, the term "bridging" always means a fluid flow from the high pressure side toward the low pressure side of the compressor via the bypass. This is done in particular at the beginning of a start of operation of the compressor and thus of the household appliance, or when passing through certain speed intervals.

According to one embodiment of the method, the bypass is controlled by means of a control, in particular for opening and / or closing. In the control preferably speed intervals or at least one speed interval may be stored, in which the bypass is used for pressure reduction at the high pressure side of the compressor. Preferably, the controller actuates the bypass during a startup phase of the compressor or while passing certain speed intervals to open the bypass. This causes the controller, if necessary, to turn on the first fluid circuit to the second fluid circuit. This in turn, the division of the fluid takes place on both circuits or the diversion of the fluid from the second to the first fluid circuit. The starting phase can z. 3 seconds to 3 minutes, preferably 10 seconds to 50 seconds. As a result, a method for operating a household appliance is provided in a simple manner, with which the household appliance can be operated quietly and stably.

Preferably, in an open state of the bypass, the fluid is circulated in the first fluid circuit, while in a closed state of the bypass, the fluid is not circulated in the first fluid circuit. In particular, in a state in which the compressor is lubricated sufficiently and in which no frequency range is passed, which excites to resonant oscillations of the compressor, the fluid is preferably not circulated in the first fluid circuit. In this condition, the bypass is in its closed state.

Preferably, the bypass comprises at least one valve, particularly preferably a bidirectional valve or a solenoid valve. By applying a voltage to the solenoid valve, it can be transferred from a closed state to an open state, and in the opened state, the fluid is passed through the bypass from the high pressure side to the low pressure side of the compressor. In the case of a bidirectional valve, by applying a voltage, the bidirectional valve can be opened or closed in stages. The bidirectional valve thus allows to regulate the volume flow through the bypass. This has the advantage that the time window in which the pressure reduction takes place is controllable. In particular, the pressure reduction in a time window between 1 second and 3 minutes Eistellbar.

• 1 ein Haushaltsgerät, und
• 2 eine schematische Darstellung eines ersten Fluidkreislaufes zum Zirkulieren eines Fluides in einem Haushaltsgerät, wobei der Kompressor mittels eines Bypasses überbrückbar ist.

Further advantages and features of the present invention will become apparent from the following description of preferred embodiments with reference to the figures of the accompanying drawings. It is understood that individual embodiments shown in the respective figures may have features that can also be used in other embodiments, even if this is not explicitly mentioned, and if this was not excluded due to technical circumstances or explicitly. Show it:

• 1 a household appliance, and
• 2 a schematic representation of a first fluid circuit for circulating a fluid in a household appliance, wherein the compressor is bridged by means of a bypass.

1 shows a household appliance 10 in which a first fluid circuit 20 with a fluid and a second fluid circuit 34 circulate with the fluid. The first fluid circuit 20 of the household appliance 10 has a compressor 22 on, which in series with a bypass 28 is interconnected, the bypass 28 has at least one valve. The at least one valve may be designed as a solenoid valve or as a bistable or bidirectional valve. The first fluid circuit 20 is parallel to the second fluid circuit 34 switched, wherein the second fluid circuit 34 the actual fluid circuit of the household appliance 10 forms. In the second fluid circuit 34 , the actual refrigeration cycle, are the compressor 22 , an evaporator 24 and a liquefier 26 connected in series.

In particular, at the beginning of a start of operation of the household appliance 10 or while passing through at least one predetermined speed interval, the bypass may 28 in the first fluid circuit 20 by means of a controller 30 be controlled. The control via the control 30 is by means of the dashed double arrow 32 indicated. About the controller 30 , which is preferably designed as a control, the bypass 28 be opened so that the fluid in the first fluid circuit through the bypass 28 from the high pressure side 36 to the low pressure side 38 the compressor is running and there the compressor 22 is fed again.

It is conceivable the controller 30 in the household appliance 10 form as a regulation, which the prevailing pressure on the low pressure side 38 and on the high pressure side 36 of the compressor can capture and evaluate and possibly the bypass 28 to reduce pressure. This is the control 30 or control with at least one sensor for detecting a pressure difference at the compressor 22 formed (not shown). Preferably, the controller controls 30 the bypass 28 during a starting phase of the compressor 22 or after a stop of the compressor 22 at. Further preferred is the bypass 28 during the passage of a certain speed interval, in particular between 30 Hz and 50 Hz, preferably between 35 Hz and 40 Hz, activated or opened. Opening the bypass will equalize the pressure within 1 second to 3 seconds, which normally takes up to 3 minutes. The circulating fluid is in an open state of the bypass 28 to the first and the second fluid circuit 20 . 34 distributed while in a closed state of the bypass 28 the fluid exclusively in the second fluid circuit 34 circulated.

The invention is preferably used in household appliances in which a compressor for operating a fluid circuit, in particular a cooling circuit with a refrigerant, is installed. For example, it may be in the household appliance 10 to a household refrigerator, such as a refrigerator, freezer or a fridge freezer act. Furthermore, it could be in the household appliance 10 to a laundry care device, such as a heat pump dryer or a heat pump washer dryer, or act, for example, a dishwasher.

LIST OF REFERENCE NUMBERS

10

household appliance

20

first fluid circuit

22

compressor

24

Evaporator

26

condenser

28

bypass

30

control

32

dashed double arrow

34

second fluid circuit

36

High pressure side

38

Low pressure side

Claims (12)

Household appliance (10) having a first fluid circuit (20) and a second fluid circuit (34) for circulating a fluid during operation of the household appliance (10), wherein in the first (20) and the second fluid circuit (34) a compressor (22) is provided with a low pressure side (38) and a high pressure side (36) for compressing the fluid, characterized in that in the first fluid circuit (20) further comprises a bypass (28) is provided, wherein the high and low pressure side of the compressor (22) for vibration and / or noise reduction during operation of the compressor and / or during the passage of a predetermined speed interval with the bypass (28) are brought into fluid communication to counteract a build-up of pressure on the high pressure side. Domestic appliance (10) according to one of the preceding claims, wherein the compressor (22) with further components forms a second fluid circuit (34), in particular with an evaporator (24) and a condenser (26). Domestic appliance (10) according to any one of the preceding claims, wherein the bypass (28) by means of a controller (30), in particular for opening and / or closing, can be controlled. The household appliance (10) of any one of the preceding claims, wherein the bypass (28) in an open state causes the fluid in the first circuit (20) to circulate and in a closed state causes the fluid not to be in the first circuit (FIG. 20), but especially in the second fluid circuit (34). Domestic appliance (10) according to one of the preceding claims, wherein the bypass (28) comprises at least one valve. Household appliance (10) after Claim 5 , where the valve is a bidirectional valve or a solenoid valve. A method for vibration and / or noise reduced operation of a household appliance (10), wherein the household appliance (10) has a first fluid circuit (20) and a second fluid circuit (34) for circulating a fluid during operation of the household appliance (10), wherein in the first and in the second fluid circuit a compressor (22) is provided with a low pressure side and with a high pressure side for compressing the fluid, characterized in that the first fluid circuit (20) is further provided with a bypass (28), wherein the high and low pressure side of the compressor (22) for vibration and / or noise reduction during operation recording or during passage of a predetermined speed interval with the bypass (28) in Fluid connection are brought to counteract a build-up of a pressure on the high pressure side. Method according to one of Claims 7 , wherein the bypass (28) by means of a controller (30), in particular for opening and / or closing, is controlled. Method according to one of Claims 7 to 8th wherein, in an open state of the bypass (28), the fluid in the first circuit (20) is circulated and in a closed state, the fluid is circulated not in the first circuit (20) but in the second fluid circuit (34). Method according to one of Claims 7 to 9 wherein the bypass (28) is used for circulating the fluid in the first circuit (20) at a predetermined speed interval, in particular at a speed interval between 30 Hz and 50 Hz, preferably between 35 Hz and 40 Hz. Method according to one of Claims 7 to 10 wherein the bypass (28) comprises at least one valve, preferably comprises a bidirectional valve or a solenoid valve. Method according to one of Claims 7 to 11 for operating a household appliance (10) according to one of Claims 1 to 6 ,

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