SCROLL COMPRESSOR

Abstract

A scroll compressor including a housing (9) with a suction inlet (10) and a system outlet (11), a first scroll element (1) with a spiral (2) that is formed on a first plate that is arranged fixed in the housing (9), a second scroll element (13) with a second spiral (15) that is formed on a second plate that is rotatably arranged in the housing (9), wherein the second spiral (15) is rotated at an angle with the first spiral (2), being arranged radially offset and put together in such a way that the second spiral (15) can roll off in the instance of a rotation of the second scroll element (13) on the first spiral (2) whilst forming a suction chamber, a central chamber and a discharge chamber.

Claims

1-6. (canceled)

7. A scroll compressor, comprising: a housing with a suction inlet and a system outlet; a first scroll element with a first spiral that is formed on a first plate that is arranged fixed in the housing; and a second scroll element with a second spiral that is formed on a second plate, the second scroll element rotatably arranged in the housing, wherein the second spiral is rotated at an angle with the first spiral, being arranged radially offset and put together in such a way that the second spiral can roll off in the instance of a rotation of the second scroll element on the first spiral whilst forming a suction chamber, a central chamber and a discharge chamber, wherein, in the first plate two eccentrically arranged pre-outlets, each of which may be shut off by way of a valve, and a centrally arranged main outlet for a refrigerant that is supplied via the suction inlet, are formed, wherein the main outlet leads into a discharge cavity with a dead volume, wherein the discharge cavity is formed between the main outlet and the system outlet and is provided with a discharge valve in the direction of the system outlet, and wherein no valve is provided at the opening of the main outlet into the discharge cavity for shutting off the main outlet.

8. The scroll compressor according to claim 7, wherein the main outlet and the two pre-outlets lead into the discharge cavity.

9. The scroll compressor according to claim 7, wherein the discharge cavity is formed by a dome, which is disposed at a discharge side on the first plate and thus covers the main outlet or the main outlet and the two pre-outlets.

10. The scroll compressor according to claim 7, wherein an intermediate space is formed between the discharge cavity and the system outlet.

11. The scroll compressor according to claim 7, wherein the scroll compressor has a total wrap angle of 660.

12. An application of the scroll compressor according to claim 7 in air conditioning mode or in a heat pump mode, wherein the valve of each of the two pre-outlets is opened and closed in the air conditioning mode for producing cold temperatures, and wherein the valve of each of the two pre-outlets remains closed in the heat pump mode for producing heat.

13. The scroll compressor according to claim 10, wherein the discharge cavity is formed by a dome.

14. The scroll compressor according to claim 13, wherein the intermediate space is formed between the dome and the system outlet.

15. The scroll compressor according to claim 14, wherein the dome covers the main outlet.

16. The scroll compressor according to claim 13, wherein the dome covers only the main outlet so the two pre-outlets lead into the intermediate space.

17. The scroll compressor according to claim 7, further comprising a dome covering the main outlet.

18. The scroll compressor according to claim 17, wherein the discharge cavity is formed by the dome.

19. The scroll compressor according to claim 18, wherein the dome covers only the main outlet so the two pre-outlets lead into an intermediate space.

20. The scroll compressor according to claim 19, wherein the intermediate space is formed between the discharge cavity and the system outlet.

21. The scroll compressor according to claim 19, wherein the intermediate space is formed between the dome and the system outlet.

22. The scroll compressor according to claim 17, wherein the dome covers only the main outlet so the two pre-outlets lead into an intermediate space.

23. The scroll compressor according to claim 22, wherein the intermediate space is formed between the discharge cavity and the system outlet.

24. The scroll compressor according to claim 23, wherein the intermediate space is formed between the dome and the system outlet.

25. The scroll compressor according to claim 17, wherein an intermediate space is formed between the discharge cavity and the system outlet.

26. The scroll compressor according to claim 25, wherein the intermediate space is formed between the dome and the system outlet.

Description

DRAWINGS

[0014] Further details, features, and advantages of embodiments of the invention become apparent from the following description of exemplary embodiments with reference to the respective drawings. Shown are in:

[0015] FIG. 1: a schematic representation of a scroll element of a scroll compressor,

[0016] FIG. 2: a 3-port finger valve according to prior art,

[0017] FIG. 3: a schematic, cross-sectional representation of a first implementation variation of the scroll compressor according to the invention,

[0018] FIG. 4: a schematic, cross-sectional representation of a second implementation variation of the scroll compressor according to the invention,

[0019] FIG. 5: a schematic, cross-sectional representation of a third implementation variation of the scroll compressor according to the invention,

[0020] FIGS. 6A and 6B: a first schematic representation for the detailed description of the air conditioning mode,

[0021] FIGS. 7A and 7B: a second schematic representation for the detailed description of the air conditioning mode,

[0022] FIG. 8: a diagram depicting the isotropic compression of the scroll compressor for the detailed description of the air conditioning mode, and

[0023] FIG. 9: a diagram depicting the isotropic compression of the scroll compressor for the detailed description of the heat pump mode.

DETAILED DESCRIPTION OF AN EMBODIMENT

[0024] Repeated features are marked in the figures with the same reference numerals.

[0025] FIG. 1 depicts a scroll element 1 in representation A with spiral 2, two pre-outlets 3 and one main outlet 4. Representation B shows the design at the outlet side of the scroll element 1 with the two pre-outlets 3 and the main outlet 4.

[0026] FIG. 2 depicts a so-called 3-port finger valve 5 as it is commonly used in prior art for shutting off the two pre-outlets 3 with the fingers or blades 6 and for shutting off the main outlet 4 with the main blade or the center blade 7, respectively. The 3-port finger valve enables the simultaneous opening and closing of the pre-outlets 3 and the main outlet 4.

[0027] According to the design of the scroll compressor according to the invention no valve is provided at the main outlet 4 so that the main outlet 4 is always open, wherein the main outlet 4 leads into a discharge cavity.

[0028] FIG. 3 depicts a schematic, cross-sectional view of a first implementation variation of the scroll compressor according to the invention. The scroll compressor according to the invention comprises a housing 9 with a suction inlet 10 and a system outlet 11. A first scroll element 1 with a spiral 2 that is formed on a first plate 12 is arranged fixed in the housing 9. The housing 9 comprises, furthermore, a rotatably arranged, second scroll element 13 with a second spiral 15 that is formed on a second plate 14, wherein said second spiral 15 is rotated at an angle with the first spiral 2, being arranged radially offset and put together in such a way that the second spiral 15 can roll off in the instance of a rotation of the second scroll element 13 on the first spiral 2 whilst forming a suction chamber SC, a central chamber MC and a discharge chamber DC (see FIGS. 6 and 7), wherein, in the first plate 12, two eccentrically arranged pre-outlets 3, each of which may be shut off by way of a valve 16, and a centrally arranged main outlet 4 for a refrigerant that is supplied via the suction inlet 10, are formed.

[0029] The main outlet 4 leads into a discharge cavity 17 with a dead volume, wherein said discharge cavity 17 is formed between the main outlet 4 and the system outlet 11 and is provided with a discharge valve 18 in the direction of the system outlet 11. In this instance no valve is provided at the outlet of the main outlet 4 into the discharge cavity 17 for shutting off the main outlet 4. The discharge valve 18 and the discharge cavity 17 may be attached by way of a bracket 19 in the housing 9. In this implementation variation, the pre-outlets 3 and the main outlet 4 lead into the discharge cavity 17.

[0030] FIG. 4 depicts a schematic, cross-sectional representation of a second implementation variation of the scroll compressor according to the invention as per FIG. 3 but with the difference that the discharge cavity 17 is formed by means of a dome 8, which only covers the main outlet 4 so that the pre-outlets 3 lead into an intermediate space 20, which is formed between dome 8 and the system outlet 11.

[0031] FIG. 5 depicts a schematic, cross-sectional representation of a third implementation variation of the scroll compressor according to the invention as per FIG. 4 but with the difference that the dome 8 is designed such that it covers the pre-outlets 3 and the main outlet 4 so that the pre-outlets 3 and the main outlet 4 lead into the discharge cavity 17.

[0032] FIGS. 6 and 7 depict a schematic representation for the detailed description of the air conditioning mode. Each shows different rotational angles of the first spiral 2 and the second spiral 15, wherein between each of the spirals 15 and 2 a suction chamber SC, a central chamber MC and a discharge chamber DC are formed. FIG. 6A depicts a rotational angle of 0 and 360 respectively, wherein the suction chamber SC has a pressure of 35 bar, the central chamber MC a pressure of 130 bar and the discharge chamber DC a pressure of 130 bar. In contrast to FIG. 6A the rotational angle in FIG. 6B is 90, whereas the central chamber MC has a pressure of 45 bar.

[0033] FIG. 7A depicts a rotational angle of 180, wherein the central chamber MC has a pressure of 57 bar. At a rotational angle of 270, as depicted in FIG. 7B, the central chamber MC has a pressure of 79 bar.

[0034] FIG. 8 shows a diagram of the isotropic compression of the scroll compressor for the detailed description of the air conditioning mode in section 21 and in section 22 in which the valves of the pre-outlets 3 in section 21 are opened and closed. There is no high-pressure flow in the combined, inner compression chamber, which is formed by the discharge chamber DC and the discharge cavity 17, although there is no main discharge valve present at the main outlet 4. The discharge chamber DC and the discharge cavity 17 are at the same level. The compressor has low discharge temperatures. The total wrap angle is 660 so that the three compression chambers (suction chamber SC, central chamber MC and discharge chamber DC) may always be formed. Due to the characteristics of the specific refrigerant CO2 the required high pressure is achieved inside the central chamber MC under all checkpoints (360 rotational angle). Thus, no main discharge valve is required. Only the pre-outlets 3 close and open.

[0035] FIG. 9 shows a diagram depicting the isotropic compression of the scroll compressor for the detailed description of the heat pump mode in section 21 and section 22. The valves 16 of the pre-outlets 3 remain closed in heat pump mode. A discharge of high pressure is possible since the main outlet 4 is always open. The pressure in the compression chamber is at a lower pressure level than the pressure in the discharge cavity 17. The scroll compressor generates high discharge temperatures, which are required for an efficient function of the heat pump.