Refrigerated display case

1. A refrigerated display case ( 1 ) with at least one unit composed of a plurality of wall groups, namely a bottom group ( 11 ), a rear wall group ( 12 ), and a top group ( 13 ), which delimit a refrigerated chamber ( 4 ) at a bottom, at a back, and at a top, and with a cooling device ( 5 ) that has a refrigerant circuit at least including a compressor ( 51 ), an evaporator ( 50 ), a condenser ( 52 ), and a control device ( 55 ), characterized in that propane is contained as a refrigerant in the refrigerant circuit, with a filling capacity of between 300 g and 1500 g the refrigerant circuit has a low-pressure region with an operating pressure of between 0.8 and 2.0 bar and a high-pressure region with an operating pressure of between 20 and 30 bar; the compressor ( 51 ) and the condenser ( 52 ) are positioned spaced apart from each other, particularly in different wall groups; the evaporator ( 50 ) is positioned in the rear wall group ( 120 ); the compressor ( 51 ) is positioned beneath the evaporator ( 50 ) in a lower region of the rear wall group ( 12 ) and at least one fan ( 56 ) for assisting a flow of cooling air is positioned above the evaporator ( 50 ) in the rear wall group ( 12 ); the at least one fan ( 56 , 57 ) has a motor over temperature protection; the cooling device ( 5 ) in the refrigerant circuit has a maximum surface temperature of less than 300° C. during operation; the compressor ( 51 ) is a hermetically sealed, suction-gas-cooled compressor, and the compressor ( 51 ) is situated in a lowest region of the refrigerant circuit in terms of geodetic altitude.

2. The refrigerated display case ( 1 ) according to claim 1 , characterized in that the propane is contained as the refrigerant in the refrigerant circuit, with a filling capacity between 500 g and 900 g.

3. The refrigerated display case ( 1 ) according to claim 1 , characterized in that the control device ( 55 ) is mounted to the top group ( 13 ), wherein in response to the control device ( 55 ) being mounted in the top group ( 13 ), the control device ( 55 ) is protectively enclosed in a housing.

4. The refrigerated display case ( 1 ) according to claim 1 , characterized in that

at least a portion of electrical components of a plurality of the electrical components used in the refrigerated display case ( 1 ) is provided with spark suppression.

5. The refrigerated display case ( 1 ) according to claim 4 , characterized in that

at least one safety relay is provided in a main circuit of the refrigerated display case ( 1 ),

the at least a portion of electrical components of the plurality of the electrical components is provided with a spark-suppressing coating,

conductor track spacings of high-voltage lines are at least 3 mm,

spark-preventing plug connections are used.

6. The refrigerated display case ( 1 ) according to claim 1 , characterized in that

the evaporator ( 50 ) has a heat transmission device ( 65 ) with aluminum fins and/or copper tubes that have an inner diameter of between 10 mm and 15 mm and/or a maximum volume of between 3 l and 7 l.

7. The refrigerated display case ( 1 ) according to claim 1 , characterized in that

the condenser ( 51 ) includes a plate heat exchanger that operates in accordance with a counterflow principle, on whose warm side a flow rate of the propane is up to 100 kg/h, and on whose cold side a glycol/water mixture is used as a coolant in a secondary circuit.

8. The refrigerated display case ( 1 ) according to claim 1 , characterized in that

the refrigerated display case ( 1 ) includes at least two display case modules ( 1 . 1 , 1 . 2 , 1 . 3 ), which are arranged in a row with each other and are composed of module frames, with side frames ( 10 ) that have frame profiles and that support the bottom group ( 11 ), the rear wall group ( 12 ), and the top group ( 13 ) with respective casing parts and

the display case modules ( 1 . 1 , 1 . 2 , 1 . 3 ) are provided with a shared evaporator ( 50 ′) that is positioned in the rear wall group and extends across a plurality of the at least two display case modules ( 1 . 1 , 1 . 2 , 1 . 3 ).

9. The refrigerated display case ( 1 ) according to claim 1 , characterized in that

side frames ( 10 ) are C-shaped when viewed from the side.

10. The refrigerated display case ( 1 ) according to claim 1 , characterized in that

a front roller shade ( 63 ) that is operated by a roller shade motor is accommodated in the front section of the top group ( 13 ) and

the roller shade motor has a spark-preventing design and/or is accommodated in a protective encapsulation.

11. The refrigerated display case ( 1 ) according to claim 2 , characterized in that

the refrigerant circuit has a low-pressure region with an operating pressure of between 0.8 and 2.0 bar and a high-pressure region with an operating pressure of between 20 and 30 bar.

12. The refrigerated display case ( 1 ) according to claim 4 , characterized in that

at least one safety relay is provided in a main circuit of the refrigerated display case ( 1 ),

the at least a portion of electrical components of the plurality of the electrical components is provided with a spark-suppressing coating,

conductor track spacings of high-voltage lines are at least 3 mm, or spark-preventing plug connections are used.

13. A refrigerated display case ( 1 ) with at least one unit composed of a plurality of wall groups, namely a bottom group ( 11 ), a rear wall group ( 12 ), and a top group ( 13 ), which delimit a refrigerated chamber ( 4 ) at a bottom, at a back, and at a top, and with a cooling device ( 5 ) that has a refrigerant circuit at least including a compressor ( 51 ), an evaporator ( 50 ), a condenser ( 52 ), and a control device ( 55 ), characterized in that propane is contained as a refrigerant in the refrigerant circuit, with a filling capacity of between 300 g and 1500 g.