REFRIGERANT COMPRESSOR

Abstract

Refrigerant compressor includes an electrical drive unit, a piston/cylinder unit which can be driven by the drive unit for the cyclical compression of refrigerant, and at least one sound-damping unit made of a thermoplastic, through which sound-damping unit refrigerant can flow and which sound-damping unit includes at least one damping chamber. The at least one sound-damping unit is connected to the piston/cylinder unit in order to enable an exchange of refrigerant between the sound-damping unit and piston/cylinder unit. The at least one sound-damping unit includes at least in sections a functional surface. The functional surface is embodied such that an emissivity of a section of the sound-damping unit includes the functional surface is less than 0.7. The at least one sound-damping unit or at least one of the sound-damping units is embodied as a discharge muffler arranged downstream of the piston/cylinder unit in the direction of flow.

Claims

1. A refrigerant compressor comprising an electrical drive unit, a piston/cylinder unit which can be driven by the drive unit for the cyclical compression of refrigerant, and at least one sound-damping unit made of a thermoplastic, through which sound-damping unit refrigerant can flow and which sound-damping unit comprises at least one damping chamber, wherein the at least one sound-damping unit is connected to the piston/cylinder unit in order to enable an exchange of refrigerant between the sound-damping unit and piston/cylinder unit, wherein the at least one sound-damping unit comprises at least in sections a functional surface, wherein the functional surface is embodied such that an emissivity of a section of the sound-damping unit comprising the functional surface is less than 0.7, preferably less than 0.5, particularly preferably less than 0.1, wherein the at least one sound-damping unit or at least one of the sound-damping units is embodied as a discharge muffler arranged downstream of the piston/cylinder unit in the direction of flow.

2. The refrigerant compressor according to claim 1, wherein the thermoplastic comprises additives, for example, aluminum and/or chromium.

3. The refrigerant compressor according to claim 1, wherein the functional surface is embodied as a metallic layer.

4. The refrigerant compressor according to claim 3, wherein the at least one sound-damping unit is completely covered by the metallic layer.

5. The refrigerant compressor according to claim 3, wherein the metallic layer contains chromium and/or aluminum.

6. The refrigerant compressor according to claim 3, wherein the metallic layer is embodied as a metallic film.

7. The refrigerant compressor according to claim 6, wherein the at least one sound-damping unit can be obtained by back injection-molding the metallic film.

8. The refrigerant compressor according to claim 3, wherein the metallic layer is spread onto and/or painted onto and/or glued onto and/or galvanized onto the at least one sound-damping unit.

9. The refrigerant compressor according to claim 1, wherein the at least one sound-damping unit or one of the sound-damping units is embodied as a suction muffler arranged upstream of the piston/cylinder unit in the direction of flow.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The invention will now be explained in greater detail with the aid of exemplary embodiments. The drawings are by way of example and are intended to demonstrate, but in no way restrict or exclusively describe, the inventive concept.

[0042] In this matter:

[0043] FIG. 1 shows a sectional view of a known refrigerant compressor;

[0044] FIG. 2 shows a front view of a suction muffler provided with a functional surface;

[0045] FIG. 3 shows a sectional view of the suction muffler from FIG. 2 according to the sectional line A-A drawn in FIG. 2;

[0046] FIG. 4 shows a front view of a discharge muffler provided with a functional surface; and

[0047] FIG. 5 shows a sectional view of the discharge muffler from FIG. 4 according to the sectional line B-B drawn in FIG. 4.

DETAILED DESCRIPTION

[0048] FIG. 1 shows a sectional view of a known refrigerant compressor 1. The refrigerant compressor 1 comprises a compressor housing 8, a drive unit 2, a piston/cylinder unit 3 in which the cyclical compression of a refrigerant takes place, and at least one sound-damping unit 4.

[0049] The at least one sound-damping unit 4 can be a suction muffler 6 and/or a discharge muffler 7. The suction muffler 6 is arranged upstream of the piston/cylinder unit 3 in the direction of flow of the refrigerant, whereas the discharge muffler 7 is located downstream of the piston/cylinder unit 3 in the direction of flow of the refrigerant.

[0050] On the path between the entry of the refrigerant into the compressor housing 8 and the intake valve of the piston/cylinder unit 3, there occurs, as mentioned previously, an undesired heating of the refrigerant. This can be attributed to the heating of the interior of the compressor housing 8, which occurs, among other things, as a result of the compressed refrigerant discharged in the discharge muffler 7. The compressed refrigerant discharged in the discharge muffler 7 thereby occasionally has temperatures of up to 180 C. and thus constitutes a significant heat source. This leads to a heating of the interior of the compressor housing 8 and, as a further result, to a heat transfer to the refrigerant located in the suction muffler 6.

[0051] For this reason, both the suction muffler 6 illustrated in FIG. 2 and FIG. 3 and also the discharge muffler 7 illustrated in FIG. 4 and FIG. 5 are provided with a functional surface 11 that is preferably embodied as a metallic layer 5.

[0052] FIG. 2 shows a front view of the suction muffler 6 comprising the functional surface 11, while FIG. 3 shows a sectional view of the suction muffler 6 from FIG. 2 according to the sectional line A-A drawn in FIG. 2. The suction muffler 6 comprises at least one damping chamber 9, but preferably multiple damping chambers 9. In FIG. 3, it can be seen that the suction muffler 6 is completely covered with the metallic layer 5.

[0053] The metallic layer 5 preferably contains aluminum and, particularly preferably, is embodied as a film that is applied to the suction muffler 6. The metallic layer 5 on the suction muffler 6 is polished in the exemplary embodiment illustrated, for which reason it has a particularly well-reflecting surface. The metallic layer 5 thus has a lower absorptivity, which is why the refrigerant inside of the suction muffler 6 is hardly heated, or not heated at all, as a result of the higher temperatures that can prevail in the interior of the compressor housing 8.

[0054] FIG. 4 shows a front view of the discharge muffler 7 comprising the functional surface 11, while FIG. 5 shows a sectional view of the discharge muffler 7 from FIG. 4 according to the sectional line 13-13 drawn in FIG. 4. The discharge muffler 7 comprises at least one damping chamber 10, but preferably multiple damping chambers 10. In FIG. 5, it can be seen that the discharge muffler 7 is completely covered with the metallic layer 5.

[0055] The metallic layer 5 preferably contains aluminum and, particularly preferably, is embodied as a film that is applied to the discharge muffler 7. The metallic layer 5 on the discharge muffler 7 is polished in the exemplary embodiment illustrated, for which reason it has a particularly well-reflecting surface. The metallic layer 5 thus has a lower emissivity, which is why the high temperature of the compressed refrigerant is hardly transferred, or not transferred at all, to the interior of the compressor housing 8. That is, the metallic layer 5 on the at least one discharge muffler 7 reduces or prevents a heat emission.

[0056] Of course, additional parts of the refrigerant compressor 1 according to the invention, such as parts of the piston/cylinder unit 3 and various tubes, for example, can also be provided with a functional surface 11, in particular with a metallic layer 5.

[0057] Via the refrigerant compressor 1 according to the invention, temperature increases in the interior of the compressor housing 8 are thus reduced, whereby in particular the refrigerant temperature at the start of the compression process, and therefore necessarily also during the intake into the cylinder of the piston/cylinder unit 3, is kept as low as possible. This causes the refrigerant compressor 1 according to the invention to exhibit a better efficiency compared to a known refrigerant compressor 1.

LIST OF REFERENCE NUMERALS

[0058] 1 Refrigerant compressor [0059] 2 Drive unit [0060] 3 Piston/cylinder unit [0061] 4 Sound-damping unit [0062] 5 Metallic layer [0063] 6 Suction muffler [0064] 7 Discharge muffler [0065] 8 Compressor housing [0066] 9 Damping chamber of the suction muffler [0067] 10 Damping chamber of the discharge muffler [0068] 11 Functional surface