Apparatus for removing non-condensable gases from a refrigerant

Abstract

An apparatus (1) for removing non-condensable gases from a refrigerant is described, said apparatus (1) comprising a pipe arrangement (2) having a pipe (3), cooling means (4) for the pipe (3), and venting means, wherein the pipe (3) comprises a connection geometry (5) for a connection to a refrigerant system. Such an apparatus should be operated with good efficiency. To this end the pipe comprises at least a first section (6) and a second section (7) which are directed in different directions.

Claims

1. An apparatus for removing non-condensable gases from a refrigerant, said apparatus comprising a pipe arrangement having a pipe, cooling means for the pipe, and a vent, wherein the pipe comprises a connection geometry for a connection to a refrigerant system, wherein the pipe comprises at least a first section and a second section which are directed in different directions, wherein the first section comprises a first end close to the connection geometry and a second end remote from the connection geometry, wherein the first end is arranged at a lower height in direction of gravity than the second end.

2. The apparatus according to claim 1, wherein the second section comprises a first end close to the connection geometry and a second end remote from the connection geometry, wherein the second end is arranged at a lower height in direction of gravity than the first end.

3. The apparatus according to claim 2, wherein the second end of the first section and the first end of the second section are connected by a third section which is inclined upwardly.

4. The apparatus according to claim 2, wherein the pipe comprises a fourth section which is inclined downwardly and connects the second section and a liquid outlet.

5. The apparatus according to claim 4, wherein the liquid outlet is connected to the first section by means of a liquid trap.

6. The apparatus according to claim 5, wherein the liquid trap comprises a duct from the liquid outlet to an inlet opening in the first section, wherein the liquid outlet is arranged higher than a lower end of the inlet opening and lower than an upper end of the inlet opening.

7. The apparatus according to claim 4, wherein the pipe comprises a fifth section connecting the fourth section to the vent.

8. The apparatus according to claim 7, wherein the fifth section is at least partly inclined upwardly.

9. The apparatus according to claim 7, wherein the cooling means act on the fourth section and the fifth section.

10. The apparatus according to claim 7, wherein a filler is arranged in the fifth section.

11. The apparatus according to claim 7, wherein the fourth section comprises a first cooling jacket and the fifth section comprises a second cooling jacket, wherein the first cooling jacket comprises an inlet at one end and a connection to the second jacket at another end.

12. The apparatus according to claim 1, wherein the pipe has an inner diameter of 25 mm or less.

13. The apparatus according to claim 3, wherein the pipe comprises a fourth section which is inclined downwardly and connects the second section and a liquid outlet.

14. The apparatus according to claim 5, wherein the pipe comprises a fifth section connecting the fourth section to the vent.

15. The apparatus according to claim 6, wherein the pipe comprises a fifth section connecting the fourth section to the vent.

16. The apparatus according to claim 8, wherein the cooling jacket act on the fourth section and the fifth section.

17. The apparatus according to claim 8, wherein a filler is arranged in the fifth section.

18. The apparatus according to claim 9, wherein a filler is arranged in the fifth section.

19. The apparatus according to claim 8, wherein the fourth section comprises a first cooling jacket and the fifth section comprises a second cooling jacket, wherein the first cooling jacket comprises an inlet at one end and a connection to the second jacket at another end.

20. The apparatus according to claim 9, wherein the fourth section comprises a first cooling jacket and the fifth section comprises a second cooling jacket, wherein the first cooling jacket comprises an inlet at one end and a connection to the second jacket at another end.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) A preferred embodiment will now be described in more detail with reference to the drawing, wherein:

(2) FIG. 1 shows schematically an apparatus for removing non-condensable gases from a refrigerant, and

(3) FIG. 2 shows the pipe arrangement in more detail.

DETAILED DESCRIPTION

(4) FIG. 1 shows an apparatus 1 for removing non-condensable gases from a refrigerant. The apparatus 1 can also be named “air purger”.

(5) The apparatus 1 comprises a pipe arrangement 2. The pipe arrangement 2 comprises a pipe 3, cooling means 4 for the pipe and a connection geometry 5 for a connection to a refrigerant system (not shown in the drawing). The apparatus 1 can directly be connected to the refrigerant system. The refrigerant system is operated with an ammonia-refrigerant. The refrigerant can have a pressure in a range from 6 to 25 bar, depending on where in the refrigeration system the air purger is arranged.

(6) The pipe 3 has in inner diameter of 25 mm or less to facilitate the low welding risk classification. When the inner diameter does not exceed the 25 mm a certified welder is not required and X-ray testing of the weldings is not necessary. It is sufficient to rely solely on pressure testing of the weldings.

(7) The pipe arrangement 2 is shown in more detail in FIG. 2. Same reference numerals are used for the same elements.

(8) The pipe 3 comprises a first section 6 which is oriented vertically, i.e. parallel to the direction of gravity. The first section 6 is connected to the connection geometry 5.

(9) The first section 6 is connected to a second section 7 via a third section 8. The second section 7 is connected to a fourth section 9 which connects the second section 7 to a liquid outlet 10. The fourth section 9 is connected to a fifth section 11. The fifth section 11 comprises at an end 12 venting means 13 in a position remote from the liquid outlet 10.

(10) The first section 6 comprises a first end 14 close to the connection geometry 5 and a second end 15 remote from the connection geometry 5. The second section 7 comprises a first end 16 closer to the connection geometry 5 and a second end 17 remote from the connection geometry 5. The terms “close” and “remote” relate to a distance through which a gas has to flow from the connection geometry 5 to the respective ends.

(11) As it comes out from FIG. 2, the first end 14 of the first section 6 is arranged at a lower height in direction of gravity than the second end 15. Likewise, the second end 17 of the second section 7 is arranged at a lower height in gravity direction than the first end 16.

(12) Since air and other non-condensable gases are heavier than the refrigerant vapour, the non-condensable gases cannot escape from the pipe 3 once they have entered the second section 7.

(13) The third section 8 is slightly inclined upwardly with the effect that refrigerant or condensable gases which condense in the third section 8 can directly flow back to the connection geometry 5. However, since the gravity works only with a rather small component on the non-condensable gas in the third section 8 this non-condensable gas is not driven back to the connection geometry 5.

(14) The fourth section 9 is slightly inclined downwardly and the fifth section 11 is slightly inclined upwardly over a large part of its length. A U-shaped part 18 of the fifth section 11 connects to the fourth section 9.

(15) The fourth section 9 is surrounded by a first cooling jacket 19 and the fifth section 11 is surrounded by a second cooling jacket 20 at least over its straight part. The first cooling jacket 19 is supplied with a cooling medium from the cooling means 4 via an inlet pipe 21. The first cooling jacket 19 is connected to the second cooling jacket 20 by means of a connecting pipe 22 and the other end of the second cooling jacket 20 is connected to the cooling means by means of an outlet pipe 23.

(16) The liquid outlet is connected to an inlet opening 24 in the first section 6, more precisely in a lower part of the first section 6 of the pipe 3. This connection is made by means of a liquid trap 25. The liquid trap 25 comprises a duct 26 which is arranged in a position lower than the fourth section 9.

(17) As can be seen in FIG. 2, the liquid outlet 10 is arranged higher than a lower end of the inlet opening 24 and lower than an upper end of the inlet opening 24. Accordingly, in the duct 26 there is permanently a volume of liquid 27 which prevents a flow of gas through the duct 26.

(18) As soon as the level of the liquid 27 in duct 26 rises, the liquid flows over into the first section 6 and from there to the connection geometry 5. On the other hand, it is hardly possible that a larger volume of liquid collects within the fourth section 9.

(19) The operation of the air purger can be described as follows:

(20) When the connection geometry 5 is connected to the refrigerant system, a gas containing condensable gases and non-condensable gases enters the pipe 3 via the connection geometry 5. This gas fills the interior of the pipe 3. The fourth section 9 and the fifth section 11 cool down to a temperature at which the condensable gases can condense. The liquid forming in this condensing process flows under the action of gravity to the liquid outlet 10 and from there through the liquid trap 25 back to the first section 6, however, without any gas.

(21) Non-condensable gases are trapped within pipe 3 once they have reached the second section 7. The non-condensable gases can escape only via venting means 13 at the end of the fifth section 11. The venting means 13 can comprise, for example, a controlled venting valve.

(22) The fifth section 11 comprises a filler element 28 reducing the free volume within the fifth section 11. In the fifth section 11 a large part of the condensable gases has already been condensed and the filler element 28 is used to increase the heat transfer from the gas within the fifth section 11 to cooling medium within the second cooling jacket 20.

(23) While the present disclosure has been illustrated and described with respect to a particular embodiment thereof, it should be appreciated by those of ordinary skill in the art that various modifications to this disclosure may be made without departing from the spirit and scope of the present disclosure.