Refrigerant compressor

Abstract

The invention concerns a refrigerant compressor with a motor, a compressor driven by the motor, and a muffling device having at least one muffler with a housing. It is endeavoured to reduce the thermal influence of suction gas in the refrigerant compressor. For this purpose, it is ensured that the housing has at least one outer wall, which is made of a foamed plastic.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is entitled to the benefit of and incorporates by reference essential subject matter disclosed in German Patent Application No. 103 23 527.2 filed on May 24, 2003. FIELD OF THE INVENTION [0002] The invention concerns a refrigerant compressor with a motor, a compressor driven by the motor, and a muffling device having at least one muffler with a housing. BACKGROUND OF THE INVENTION [0003] Such a refrigerant compressor is, for example, known from DE 195 16 811 C2. Here, the motor and the compressor are located in a case together with a suction muffler. That is, a hermetically enclosed refrigerant compressor is concerned, which has proved its value for several years. [0004] With such compressors, the refrigerant gas coming from the evaporator is sucked in, compressed in the compressor, which increases the temperature of the refrigerant gas, and then discharged by a discharge nozzle, which in many cases communicates with a ...

AI Technical Summary

Benefits of technology

[0008] With this embodiment, an improved thermal isolation towards the environment of the gas entering the muffler is achieved, without requiring an additional isolation layer. The housing itself makes the isolation. As the outer wall of the housing is made by a foamed plastic, it provides an excellent isolation. When the muffler is used as a suction muffler, the suction gas remains relatively cold, that is, it is not heated by the temperature ruling in the case. When the muffler is arranged to be a pressure or pulsation muffler at the outlet of the compressor, the outer wall of the housing made of foamed plastic also provides thermal isolation, so that the heat from the heated refrigerant gas is not transferred to the environment. Also this is a measure, with which an undesired heat transfer to the refrigerant suction gas can be avoided. Of course, also a foamed plastic does not give perfect thermal isolation, that is, heat will still be able to flow through the outer wall. However, compared with a wall of massive plastic, which has been used until now, the heat flow will be substantially reduced, so that the thermal influence on the suction gas can be reduced accordingly. Making at least one outer wall of a foamed plastic will only increase the manufacturing costs of the muffler insignificantly or not at all. On the other hand, however, the efficiency of the compressor provided with the muffler is increased, so that possible additional costs will be balanced very soon.

[0009] Preferably, all outer walls are made of foamed plastic. This gives improved heat isolation of the gas in the muffler towards the environment. Additionally, a partly substantial noise muffling is achieved. A foamed plastic can have better noise muffling properties than a massive plastic, as an oscillation transfer through a massive plastic can take place substantially more directly than through a foamed plastic. It is assumed that the gas bubbles contained in the foamed plastic obstruct a noise penetration. Thus, a housing, all outer walls of which are made of foamed plastic, offers two advantages.

[0010] It is preferred that the housing is made of foamed plastic. This simplifies the manufacturing. Also, when chambers, bars or other elements are provided in the housing, which are made in one piece with the other housing parts during manufacturing, a foamed plastic can be used. The foamed plastic is then also available inside the housing with the mentioned elements. The result is a housing for the suction muffler made of a substantially homogenous material. Thus, the risk that fatigue phenomenon occur in connection with material transitions, for example due to stress crack corrosion, is relatively small.

[0012] Preferably, the muffler is located in a case, in which the motor and / or the compressor are located. In this case, the use of a muffler, which is completely or partly made of foamed plastic, is particularly advantageous. As stated above, an increased temperature is usually available in a closed case, as the compressor, in which the refrigerant gas is compressed, causes a temperature increase in the refrigerant gas during compression. This increased temperature radiates into the inside of the case. When now, particularly a suction muffler of a foamed plastic is used, the refrigerant gas, which is sucked in, is kept cold and the efficiency of the compressor increases.

Problems solved by technology

Of course, also a foamed plastic does not give perfect thermal isolation, that is, heat will still be able to flow through the outer wall.

Making at least one outer wall of a foamed plastic will only increase the manufacturing costs of the muffler insignificantly or not at all.

Additionally, a partly substantial noise muffling is achieved.

It is assumed that the gas bubbles contained in the foamed plastic obstruct a noise penetration.

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