NL1025415C2 - Degassing device. - Google Patents

Abstract

Degasification device (1) for a line system for transporting a liquid at different temperature, especially a heating system line, comprises a housing (2) with a cylindrical chamber (3), at least two inlets (4, 5) and one outlet (6) joining the chamber to the line system, and a degasification cut-off valve (8) provided on the upper side of the chamber for leading gases out of the housing. The chamber is vertical and the inlets are oriented at least tangentially into the chamber. Independent claims are also included for: (1) Complex comprising a degasification device with a heat exchanger; and (2) Heating system comprising a degasification device connected to a line system.

Description

4

Brief indication: Degassing device.

The invention relates to a degassing device, in particular a venting device for a central heating installation.

When installing and using a central heating system, good ventilation is required for the system to work properly. However, many known venting devices that are built into central heating installations poorly vent or are bulky.

A venting device according to the preamble of claim 1 is known from NL-A-8603021, in which a device is shown which comprises a housing containing a pre-chamber which connects via a tangentially directed feed to an upper part of an upright cylindrical chamber. The front chamber can be connected to a pipe system of a central heating system, while the cylindrical chamber at the bottom is provided with a drain that can also be connected to the pipe system. Water to be vented enters the venting device via the pre-chamber, flows up, is then guided horizontally and fed tangentially into the cylindrical chamber via the feed. The water in this chamber will flow down the wall helically and leave this chamber via the drain. During the rotation of the water, a so-called cyclone action is created in which air bubbles in the water move towards the center of the chamber and will then escape upwards from the chamber via a float vent provided at the top of the chamber.

A drawback of this known device is that the venting can still be improved, and that the pressure drop over it is relatively high. The construction with the anterior chamber has bends where flow losses occur. Furthermore, the device is unsuitable for connection to several channels at the same time, or bringing several channels together to one channel leads to flow losses. A lot of pressure drop means that a strong pump is needed or more pump power is required to achieve the desired

I 2 I

I is required or more pump power is required to achieve the desired I

I reach the water flow. Furthermore, the device is not or only I

I limited ability to ascend with a stagnant water flow I

I air bubbles through the float breather to the environment. I

The present invention has for its object to provide the aforementioned I

I at least partially overcome disadvantages or a usable I

I provide an alternative. In particular, the invention has up to I

The object of this invention is to provide a degassing device which at low I

I dimensions and low pressure drop can achieve good degassing. I

This object is achieved by a degassing device according to I

Claim 1. The device herein comprises a housing with an in I

I substantially vertically oriented cylindrical chamber with at least two I

I feed substantially tangentially directed and a drain for I

Connection to a piping system, as well as a degassing valve

I 15 for discharging gases from the housing. The feeds are I

I intended to be in flow communication or to be brought with I

I supply channels of the pipe system, while the discharge is intended I

I to be in flow communication or to be introduced with an I

I drainage system of the piping system. Taking care of the feeding during I

I operate an eccentric inflow of liquid. This creates I

I a cyclone in which gases move from the liquid to I

I the center of the room. The gases can then pass through the I

The degassing valve is separated from the liquid circuit. I

It has been found that advantageously at least two substantially I

Ing 25 directed tangentially into a degassing chamber

Liquid flows with a low pressure drop and very good degassing

I can be merged into one drain. I

In a special embodiment the feeds open up in I

Basically the same height in the room. This arrangement ensures I

I ensure that the liquid streams mix well together, together I

I flow downwards helically and form one cyclone. I

I This advantageously results in an even more optimal degassing. I

In a further embodiment, the one feed is through an angle I

I of substantially 90 degrees rotated along the peripheral wall of the I

Provided with a chamber relative to the other supply. Also because of this I

I creates the effect of several incoming liquid flows that I

I mix well together and form one joint cyclone. I

I This arrangement also makes placement of the degassing device I

This is possible in an arrangement with two supply channels which are positioned at a substantially perpendicular angle to each other, without unnecessary pressure losses occurring thereby.

The object according to the invention can also be achieved by a degassing device as claimed in claim 4. The device herein comprises a housing with a substantially vertically directed cylindrical chamber with at least one substantially tangentially directed supply and a discharge for connection to a pipe system, as well as a degassing valve for discharging gases from the housing. The inputs and outputs are intended to be in flow communication or to be brought into supply and discharge channels of the pipe system. The drain is substantially axially oriented and connects to the lower end of the chamber. Advantageously, a low pressure drop in the degassing device 15 is hereby achieved, in particular if the lower end of the chamber progresses gradually to a smaller cross-section that merges into the outlet. Due to the substantially axially directed discharge, with a stationary or slow liquid flow, gas bubbles can rise undisturbed through the chamber and escape through the degassing valve. As a result, the degassing device can degass well and efficiently both during transport of liquid therethrough and during temporary standstill of the liquid therein, which provides a more optimum total degassing performance.

In a variant, the discharge can also be directed substantially tangentially and connect to the peripheral wall of the chamber. The advantage of the eccentric outflow is also a low pressure drop.

Further preferred embodiments are defined in the subclaims.

The invention also relates to an assembly of a degassing device with a heat exchanger according to one of the claims 10-12, and to a heating installation according to claim 13.

The invention will be further elucidated with reference to the accompanying drawing, in which: 1 shows a schematic perspective view of an embodiment of the degassing device according to the invention; 1025415

4 I

FIG. 2 shows a schematic perspective view of an I

assembly of a variant of the degassing device with an I

heat exchanger; I

FIG. 3 schematically the pipe system with the I connected thereto

Fig. 5 shows degassing device from Fig. 2 without housing; I

FIG. 4 the side wall with the I integrated therein

2 shows degassing device; and I

FIG. 5a and 5b show the side wall of fig. 4 as seen in section

from opposite directions. I

In figure 1 the device is indicated in its entirety by the I

reference numeral 1. The device 1 comprises a housing 2 with I therein

an upright cylindrical chamber 3. On the chamber 3 are two I

horizontal supply lines 4, 5 connected, with each supply 4, 5 l

flows into an inflow part that is tangential (eccentric to I

15 relative to the central axis) in the chamber 3. The I

feeds 4, 5 are at an angle of 90 degrees with respect to I

each other, extend on the same side of the center line of the chamber I

3, and are at the same height. The inputs 4, 5 are I

intended to be connected to a pipe system through which I

20 during operation water or another liquid heating medium with I

a varying temperature is transported. The lower end of I

the chamber 3 has a truncated conical shape, which cone passes I

in a vertical drain 6. The drain 6 starts with an I

outflow part that is substantially axially oriented and substantially in I

25 is an extension of the central axis of the cylindrical chamber I

3. At the top of the chamber 3 is an automatically operating I

float degasser 8. In a variant, a manual degasser can also be used

be provided. The degasser 8 is located substantially directly above I

the outlet 6. At the top of the chamber 3 below the degasser 8 is I

30 a flow shot 9. I

During operation, it flows around transported I

heating medium via the two feeds 4, 5 with a certain I

speed eccentric into the chamber 3. Both I

Fluid flows are counterclockwise and reinforce each other. Because of this I

35, a strong vortex (cyclone) is generated with the liquid I

flows down the helix wall along the chamber wall. The ones in I

the gases contained in the liquid, in particular air, are I

hereby pushed to the center of the vortex. The gases can I

1025415 move from the center of the chamber 3 to the top of the chamber 3 and then be discharged automatically or manually via the degasser 8 into the environment. The liquid thus freed of gases leaves the chamber 3 at the bottom via the outlet 6. The cone here ensures a gradual deflection of the liquid flow in order to minimize the pressure drop there. The flow partition 9 ensures that the gases separated from the liquid can settle at the top of the chamber 3, while the separation of liquid and gas remains intact.

Figures 2-5 show an assembly of a heat exchanger 10 of a central heating installation with a variant of the degassing device described above 1. The heat exchanger 10 comprises a housing 11 with a part of a pipe system 12 (see figure 3) which can be heated with with the aid of flue gases released during the combustion of a gas in a burner which can be provided at the top of the housing 11. The pipe system 12 is here partially integrated into the walls of the housing 11. The walls of the housing 11 can for instance be made of aluminum. The pipe system 12 comprises a connecting nozzle 13 which becomes a meandering channel 14 with bends and straight pipe sections. The channel 14 splits into two in the upper part of the heat exchanger 10, whereafter the liquid flows in parallel flow through channels 18, 19 integrated in a front and rear wall 16, 17 of the housing 11. These channels 18, 19 form cooling channels for cooling the upper wall parts of the housing 11 of the heat exchanger 10. The cooling channels 18, 19 open out at the respective inlet 4, 5 of the degassing device 1. The discharge 6 of the degassing device 1 connects to a connecting nozzle 21 of the pipe system 12.

The housing 2 of the degassing device 1 is here integrated in a particularly one-piece side wall 22 of the housing 11, wherein the degassing device is provided at an angle of the side wall 22 (see Figure 4). The internal structure of the side wall 22 can be seen in the two cross-sections of Figs. 5a and b, in which two mutually connectable side wall parts 22a, 22b are shown. It can also be seen here that, in addition to a vertically arranged flow partition 24a, an inwardly protruding inwardly extending boundary edge 24b is also provided. This can advantageously be cast during the manufacture of the housing 11, 1025415

6 I

and also serves to calm the gases at the top of the chamber I

let it come and let liquid escape through the degasser I

8. I

In addition to the embodiments shown, many variants are I

5 possible. For example, more than two can supply with I

associated substantially tangentially directed inflow parts are I

provided, and the feeds may be at other positions relative to I

each other. The feeds and / or the I

inflow parts thereof are positioned somewhat differently, I

10, for example, may also be directed somewhat obliquely downwards. In I

Instead of being integrated into a heat exchanger housing, the I

degassing device there also as a separate part on I

or the degassing device can be mounted on another I

position in a pipeline system. The feeds and I

Supply channels can integrally merge into one another, or be provided I

of mutually connectable nozzles. Instead of a burner I

another heating element can also be used. I

Thus, according to the invention, it is efficient and compact

and a cheaply buildable degassing device that can be used both at I

20 non-flowing heating medium as well as at high flow rates good I

degassed because in the latter a centrifugation effect than I

increases. The pressure drop is low and even lower than when two or more I

horizontal supply channels of a heat exchanger would come together I

and with a normal 90 degree bend would merge into one I

25 joint vertical drain. I

30 I

1025415 I

Claims (13)

A degassing device for a pipe system in which a liquid with varying temperature can be transported, in particular a pipe system of a heating installation, comprising: - a housing (2) with a substantially cylindrical chamber (3); - at least one supply (4) and an outlet (6) for connecting the chamber (3) to the pipe system; and - a degassing valve (8) for discharging gases from the housing (2), wherein the chamber (3) is directed substantially vertically, the feed (4, 5) is directed substantially tangentially into the chamber (3), and the degassing valve (8) is provided at the upper end of the chamber (3), characterized in that at least two feeds (4, 5) are provided for connection to supply channels of the pipe system, which feeds (4, 5) each directed substantially tangentially into the chamber (3). Degassing device according to claim 1, wherein the feeds (4, 5) open into the chamber (3) at substantially the same height. Degassing device according to claim 1 or 2, wherein the one feed (4) is provided rotated through an angle of substantially 90 degrees along the peripheral wall of the chamber (3) with respect to the other feed (5). Degassing device, in particular according to one of claims 1-3, for a pipe system in which a liquid of varying temperature can be transported, in particular a pipe system of a heating installation, comprising: - a housing (2) with a substantially cylindrical room (3); 35. at least one supply (4) and an outlet (6) for connecting the chamber (3) to the pipe system; and - a degassing valve (8) for discharging gases from the housing (2), 1025415 ' 5. Degassing device according to claim 4, wherein the lower end of the chamber (3) progresses gradually to a smaller section. I 6. Degassing device according to claim 4 or 5, wherein the discharge (6) and the degassing valve (8) are provided substantially directly above each other. I 7. Degassing device according to one of claims 1-3, wherein the drain (6) is oriented substantially tangentially and connects to the peripheral wall of the chamber (3). I 20 I Degassing device according to one of the preceding claims, wherein above the feeds (4, 5) a limiting means (9) is provided in the chamber (3) for the liquid flow. I 8 where the chamber (3) is oriented substantially vertically, the inlet I (4) is directed substantially tangentially into the chamber (3), and the degassing valve (8) provided at the upper end of the chamber (3) is characterized in that the drain (6) is oriented substantially axially and is positioned in the lower end of the chamber (3). I The degassing device according to claim 8, wherein the limiting means (9) is a wall part protruding inwards into the chamber (3). I 10. Assembly of a degassing device (1) according to one of the preceding claims with a heat exchanger (10) comprising a housing (11) with a heating element therein, a part of a pipe system (12) with supply and discharge channels ( 13, 14, 18, 19, 21) I through which a liquid transport to be heated is acceptable, which supply and discharge channels (13, 14, 18, 19, 21) are connected to the respective supply and discharge ( 4, 5, 6) of the degassing device I (1). I 1025415 I An assembly according to claim 10, wherein the housing (2) of the degassing device (1) is integrated in a side wall (22) of the housing (11) of the heat exchanger (10). An assembly according to claim 10 or 11, wherein the supply and discharge channels (13, 14, 18, 19, 21) are at least partially integrated in side walls (16, 17, 22) of the housing (11) of the heat exchanger ( 10). 13. Heating installation with a degassing device connected to a pipe system thereof according to one of the preceding claims. 1025415