Gas separator

Abstract

Gas separator for heat transfer fluid circuits in heating appliances, comprising a separation chamber (1), a liquid inlet (10) into the separation chamber (1), a liquid outlet (11) from the separation chamber (1), and a gas outlet (12) from the separation chamber (1), wherein the liquid inlet (10) is arranged such that during operation a liquid flows into the separation chamber (1) without controlled circulation, characterized in that, downstream of the liquid inlet (10), a first sub-chamber (2) is provided with a screen (7) filling a hollow cylinder geometry or hollow prism geometry (8) oriented coaxially to the flow direction, and that, downstream of the first sub-chamber (2), a second sub-chamber (3) with a horizontal partition (6) is provided horizontally, immediately downstream of the first sub-chamber (2), which divides the second sub-chamber (3) into an upper sub-chamber (4) and a lower sub-chamber (5), which are open towards the first sub-chamber (2).that the gas outlet (12) is located in the upper subchamber (4) and that the liquid outlet (11) is located in the lower subchamber (5).

Description

[0001] The invention relates to a gas separator for heat transfer fluid circuits in heating appliances.

[0002] Heating systems for building heating and hot water use water as the heat transfer medium. This water is heated by a heat source and circulated by a pump to the heat sink. During this process, gas bubbles can separate from the liquid, disrupting the system's operation.

[0003] To separate such gas bubbles, it is known from German patent application DE 2016 201 254 A1 to construct a gas separator with a delay section in which gas bubbles are separated. The liquid flow is then deflected downwards. An optionally perforated baffle plate separates a dead space in the upper area of ​​the gas separator, from which the gas can be discharged.

[0004] US Patent 4,427,421 A discloses a method for separating gas from a gas-containing liquid, comprising the steps of guiding the gas-containing liquid in a rotary motion through a sieve tube in a separator chamber, wherein the centerline of the sieve tube and the separator chamber is at an angle of 45° to the Earth's gravity. The dimensions of the sieve tube are chosen such that the axial velocity of the liquid at the upper opening of the sieve tube is less than the buoyancy velocity of the gas bubbles. A device for separating gas bubbles from a liquid comprises an inlet tube, an outlet tube, a separator chamber, a rotary motion-generating device, and a stationary sieve tube.The device is designed so that the gas-containing liquid is supplied with a rotary motion, whereby gas bubbles are forced in a centrifugal flow field towards the center line of the chamber and escape through the upper opening of the sieve tube, while the degassed liquid flows to the outlet line.

[0005] US 2005 / 0132889A1 describes a kit for assembling a deaerator that removes gas from a liquid distribution system. It includes a tee that defines a chamber with a cylindrical wall, axially aligned with a cap connection and two pipe connections. The kit also includes a valve that communicates with the liquid within the chamber and a gas concentrator for extracting gas from the liquid.

[0006] The solutions known from the prior art have the disadvantage of a complex design. Furthermore, the gas separator cannot be adapted to different boundary conditions such as varying flow rates or pressure conditions.

[0007] The object of the invention is therefore to provide a gas separator with a simple design and scalable design.

[0008] This problem is solved according to the features of claim 1 in that the liquid to be degassed initially flows into a first, preferably cylindrical or prismatic, subchamber without the use of a swirl generator. A sieve is provided on the outer circumference of the first subchamber, which lies within a hollow cylindrical or prismatic geometry. The hollow cylindrical or prismatic geometry is axially parallel to the cylindrical or prismatic first subchamber and has a minimal volume, but completely encloses the sieve. Components provided for mounting the sieve and which do not contribute to the degassing of the liquid are not considered part of the sieve.

[0009] Hollow prism geometry refers to the volume between two coaxial prism surfaces of the same finite length.

[0010] Horizontally and in the direction of flow adjacent to the first sub-chamber, a second sub-chamber with a horizontal partition is connected, which divides the second sub-chamber into an upper sub-chamber with gas outlet and a lower sub-chamber with liquid outlet.

[0011] The gas separator according to the invention provides a gas separator that is easy to manufacture and can be easily adapted by using differently designed sieves.

[0012] Advantageous configurations result from the characteristics of the dependent claims.

[0013] The invention will now be explained in detail using the figures.

[0014] They represent: Fig. 1: a longitudinal section through a gas separator according to the invention Fig. 2: a longitudinal section through an alternative embodiment of a gas separator according to the invention Fig. 3: a cross-section through a sieve Fig. 4: a cross-section through a prismatic sieve Fig. 5: a longitudinal section through a truncated cone-shaped sieve Fig. 6: a cross-section through a pleated-cuff-shaped sieve

[0015] Fig. Figure 1 shows a longitudinal section through a gas separator according to the invention. The horizontally oriented gas separator comprises a separation chamber 1, which is divided into a first sub-chamber 2 and a second sub-chamber 3. A screen 7 is provided in the first sub-chamber 2. This screen 7 is enclosed by an imaginary hollow cylinder or hollow prism geometry 8, wherein the hollow cylinder geometry has a minimal possible volume. Depending on the shape of the screen 7 as a rotationally symmetric or prismatic structure, the geometry has either the shape of a hollow cylinder or the shape of a hollow prism. Liquid can be introduced into the separation chamber 1 through a liquid inlet 10.The liquid inlet 10 is arranged such that the liquid is fed in essentially without swirl; this means that the vector of the inflowing liquid has no velocity component tangential to the centerline 15 of the separation chamber 1. The liquid to be degassed can initially flow into the first sub-chamber 2 through the liquid inlet 10. The reduction in flow velocity associated with the increase in cross-sectional area from the liquid inlet 10 to the first sub-chamber 2 causes degassing. The sieve 7, arranged concentrically on the outside of the first sub-chamber 2, further promotes the formation of gas bubbles.

[0016] Downstream of the first subchamber 2, in the direction of flow of the liquid to be degassed, the second subchamber 3 is arranged. The second subchamber 3 is horizontally divided by a partition 6 into an upper subchamber 4 and a lower subchamber 5. Due to their lower density, the separated gas bubbles collect in the upper subchamber 4 and can be discharged via a gas outlet 12. A means (not shown) is arranged at the gas outlet 12 to prevent the escape of liquid. This means is not part of the present invention and is known from gas separators of this type.

[0017] In the lower subchamber 5, the liquid drain 11 is provided, through which the liquid, at least partially freed from gas bubbles, flows out of the separation chamber 1.

[0018] Preferably, the second sub-chamber 3 borders directly on the first sub-chamber 2. The sieve 7 can then rest directly against the separating bar 6.

[0019] The housing of the gas separator, which encloses the separation chamber 1, can be constructed in multiple parts. For example, a dividing joint could be provided between the first and second sub-chambers. Additionally or alternatively, a dividing joint could be provided on the second sub-chamber 2 in the area of ​​the liquid inlet 10, forming a removable cover with the liquid inlet 10. This cover allows for the installation of the screen 7 and thus facilitates the use of different screens 7. Furthermore, first sub-chambers 2 of different lengths can easily be used.

[0020] In Fig. 2 is an alternative embodiment with two variants shown, which can be used independently of each other according to the invention.

[0021] Between the liquid inlet 10 and the first sub-chamber 2, an inlet chamber 9 is provided, into which the liquid to be degassed initially flows before it flows into the first sub-chamber 2.

[0022] Furthermore, a flange 13 is provided in the separation joint on the side of the first sub-chamber 2 facing the liquid inlet 10, in which a collar 14, which is connected to the sieve 7, is clamped.

[0023] Fig. Figure 3 shows the cross-section of sieve 7 made of Fig. 1. In this example, the sieve 7 is cylindrical and is enclosed by a hollow cylindrical geometry 8.

[0024] Fig. Figure 4 shows the cross-section of an alternative sieve 7 made of Fig. 1. In this example, the sieve 7 has the shape of the lateral surface of a prism. In this case, it is enclosed by a hollow prism geometry 8.

[0025] Fig. 5 represents in longitudinal section as in Fig. Figure 1 represents a cone-shaped sieve 7. This sieve is in turn enclosed by a hollow cylindrical geometry 8. Additionally, the sieve 7 is connected to a collar 14. Since the collar 14 is not part of the sieve 7 as defined in the invention, it is not enclosed by the hollow cylindrical geometry 8. In fact, however, the collar 14 is connected to the sieve 7, or the collar 14 and the sieve 7 are formed in one piece.

[0026] Fig. Figure 6 represents a pleated cuff-shaped sieve 7 that is enclosed by the hollow cylinder geometry 8. Reference symbol list 1 separator chamber 2 first sub-chamber 3 second subchamber 4 upper subchamber 5 lower chamber 6 dividing strip 7 sieve 8 Hollow cylinder geometry or hollow prism geometry 9 Inlet chamber 10. Fluid enema 11. Liquid drainage 12 Gas outlet 13 Flange 14 collars 15 Center line

Claims

[1] Gas separator for heat transfer circuits in heating appliances, comprising a separation chamber (1), a liquid inlet (10) into the separation chamber (1), a liquid outlet (11) from the separation chamber (1), a gas outlet (12) from the separation chamber (1), wherein the liquid inlet (10) is arranged such that during operation a liquid flows into the separation chamber (1) without a controlled circulation, characterized by, that in the direction of flow behind the liquid inlet (10) a first subchamber (2) with a sieve (7) filling a hollow cylinder geometry or hollow prism geometry (8) oriented coaxially to the direction of flow is provided, that in the direction of flow horizontally immediately behind the first subchamber (2) a second subchamber (3) with a horizontal partition (6) is provided, which divides the second subchamber (3) into an upper subchamber (4) and a lower subchamber (5) which are open to the first subchamber (2), that the gas outlet (12) is located in the upper subchamber (4) and that the liquid outlet (11) is located in the lower subchamber (5). [2] Gas separator according to claim 1, characterized by , that the hollow cylinder geometry or hollow prism geometry (8) extends over the length of the first subchamber (2). [3] Gas separator according to claim 1 or 2, characterized by, that the ratio of the outer to the inner base area of ​​the hollow cylinder geometry or hollow prism geometry (8) is greater than 3, preferably greater than 4, particularly preferably greater than 8. [4] Gas separator according to any one of claims 1 to 3, characterized by that the sieve (7) is connected to a radially outwardly projecting collar (14) outside the hollow cylinder geometry or hollow prism geometry (8). [5] Gas separator according to any of the preceding claims, characterized by , that the ratio of the mean cross-sectional area of ​​the first sub-chamber (2) orthogonal to the flow direction to the outer base area of ​​the hollow cylinder geometry or hollow prism geometry (8) is less than 2. [6] Gas separator according to any of the preceding claims, characterized by , that the sieve (7) rests against the separating bar (6). [7] Gas separator according to any one of claims 1 to 6, characterized by , that the sieve (7) is made of expanded metal. [8] Gas separator according to any one of claims 1 to 6, characterized by , that the sieve (7) is made of wire mesh. [9] Gas separator according to any of the preceding claims, characterized by , that the sieve (7) has the shape of a cylindrical lateral surface. [10] Gas separator according to any one of claims 1 to 8, characterized by , that the sieve (7) has the shape of the lateral surface of a truncated cone. [11] Gas separator according to any of the preceding claims, characterized by , that the sieve (7) has the shape of a pleated cuff. [12] Gas separator according to any of the preceding claims, characterized by that the separating web (6) is arranged above the center, preferably between the upper and middle thirds of the second sub-chamber (3). [13] Gas separator according to one of the preceding claims, wherein the gas separator has a central axis (15) and wherein the liquid inlet (10) is tubular, characterized by, that the central axis (15) of the gas separator is parallel to the central axis of the liquid inlet (10). [14] Gas separator according to the preamble of claim 13, characterized by , that the central axis (15) of the gas separator and the central axis of the liquid inlet (10) intersect.

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