Household appliance with heat pump comprising an expansion device

By connecting a static expander, such as a capillary tube, in parallel with a heat pump in a household appliance, the problem of uncontrollable pressure caused by electronic control valve failure is solved, enabling the use of flammable working media at low cost and in compliance with safety standards. This method is suitable for household appliances such as laundry dryers and dishwashers.

CN113756068BActive Publication Date: 2026-06-09BSH HAUSGERATE GMBH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BSH HAUSGERATE GMBH
Filing Date
2021-06-01
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing heat pumps that use flammable working media in household appliances require additional pressure-sensitive electrical limiting devices, resulting in high costs and uneconomical practices. In particular, when the electronically controlled expansion valve malfunctions, it may lead to uncontrollable pressure and pose safety hazards.

Method used

In a heat pump system, a static expander, such as a capillary tube, is connected in parallel with an electronically controlled valve to ensure that the working medium can still flow through the static expander even if the electronically controlled valve fails, thus achieving automatic fault-prevention operation.

Benefits of technology

By using a static expander, costs are reduced, safe and reliable operation of the heat pump is achieved, pressure runaway caused by electronic control valve failure is avoided, and the requirements of safety standard DIN EN 60335-2-11 are met.

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Abstract

The invention relates to a domestic appliance comprising a heat pump, the heat pump comprising a heat source for outputting heat, a heat absorption device for absorbing heat and a working medium circulation system for pumping heat from the heat absorption device into the heat source, the working medium circulation system comprising a compressor, an expansion device and a first circuit system which is closed in itself and is provided for circulating working medium from the compressor to the heat source, from the heat source to the expansion device, from the expansion device to the heat absorption device and from the heat absorption device to the compressor, and the expansion device comprises a valve which can be controlled by means of a control device. Here, the expansion device has a static expander which can be flowed through by working medium in parallel to the controllable valve. The domestic appliance is in particular configured as a laundry dryer.
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