DE19800361A1 - Liquid degassing, e.g. for heating system - Google Patents

Abstract

Liquid degassing is carried out by operating valves, including pinch-valves, in a logical sequence for entry and reduced pressure degassing of a portion of the liquid, the operation being reversed to return the liquid into the system. A liquid degassing process uses several valves, of which at least two are pinch-valves, operated in a logical sequence such that a portion of the liquid flows or is sucked into the apparatus and is degassed by the reduced pressure produced in a pinch-valve chamber (17), optionally with the aid of reduced pressure in a pressure chamber (8). The gas is discharged via an upper valve (2), while the degassed liquid is returned to the system by reversal of the operation, i.e. sequentially closing of valves (11,7,20). Preferred Features: The liquid to be degassed may be additionally pressurized by the pinch-valves to improve gas collection in the circuit or vessel. The gas outlet end (4) may have a venting valve and an odor filter, e.g. an active carbon filter. The pinch-valves are pneumatically or hydraulically operated.

Description

Degassing liquids is a well known problem. At this is shown, for example, in heating systems. After a classic process Solution (ventilation) is usually still available via the valves provided for this purpose Gas (air) in the plant. This gas collects in an unfavorably laid pipe fragment or diffuse through the membrane of the expansion vessels, through the smallest Leaks and the like in the liquid.

The dissolved gas is transported to the pump, where it causes noise winding and cavitation. By oxygenating the liquid z. B. in Heating systems will favor the silting of the pipe system or a Production process adversely affected.

Especially in industrial plants for process heat and space heating Therefore, the system always manually or with the procedures provided for it be degassed. These methods work e.g. B. so that they are the system or parts pressurize it first. This allows the liquid absorb a larger proportion of gases. After that, the liquid is in egg exposed to negative pressure in a separate container. The gas is made from the Liquid driven and drained. With another pump, the degassed Pumped liquid back into the circulation.

In order to be able to generate a negative pressure with reasonable effort for example ejector pumps used. An ejector offers itself here also because there is a risk that liquid will get into the pump. Expensive Vacuum pumps are not suitable for this in practical operation.

The usual degassing processes are complex and therefore expensive, which are required devices are more for industrial use under the supervision of a specialist thought by force. An automatic degassing process is not without further feasible.

In small and medium-sized buildings -z. B. Single and multi-family houses is the Continuous use is not worthwhile.

The invention has for its object a method with a Vorrich to design that works without the aforementioned disadvantages, which in any small size and can be used almost anywhere.

According to the invention the object is achieved in that some pinch valves - u. U. in combination with conventional, remote-controlled valves - so arranged net and pressurized or remotely operated in the intended order that part of the liquid is sucked into one of the valve chambers and in a further step in a further valve chamber he a negative pressure  is fathered. The expelled gas is total in the second valve chamber melts and flows into the atmosphere via another valve.

Basically, part of the liquid to be degassed is removed and exposed to negative pressure. To get the degassed liquid back into the To introduce the circuit, the valves are operated so that the liquid in the circuit is pushed back.

The procedure is as follows:
The device consists of the valves 20 , 7 , 11 and 2 (in the example only pinch valves). It is flanged to the circuit or container of the liquid to be degassed with the inlet / outlet end 25 .

The pressure chamber 3 of the valve 2 is pressurized and thus squeezed together, the valve chamber 15 is closed.

The valve spaces 27 and 19 are filled with liquid from the circuit.

In order to enrich the liquid in the system with gas from the system, the three pressure chambers 8 , 13 and 28 are pressurized, the valve chambers are emptied. The pressure in the entire system increases and more gas can be bound in the liquid.

• 1. All four valves are closed.
• 2. In order to carry out a degassing process, valve 20 is opened first, since valve 7 is then opened. As a result, liquid is sucked out of the system into the valve chamber 27 .
• 3. The valve 20 is closed. There is no longer a connection to the circuit.
• 4. The valve 11 is opened by pressure relief in the pressure chamber 8 and the return ability of the hose 1 , the resulting negative pressure in the valve chamber un degasses the liquid in the valve body. The gas can now collect in the valve chamber 17 . If required, the pressure chamber 8 can be subjected to a vacuum.
• 5. After opening valve 2 and closing valve 7 , the gas at outlet 4 is pressed out of the device.
• 6. Valve 2 is closed again, valve 20 opened, valve 7 closed, the degassed liquid is returned to the circuit.
• 7. The valve 20 is closed, the state from 1. Is reached again.
• 8. If the valves 20 , 7 and 11 are now opened, liquid flows out of the system into the device, the process can start again.

Reference list

1

Pinch valve hose

2nd

Valve

3rd

Pressure chamber

4th

Outlet end for gas

5

Connection for the print medium

6

Connecting bolt

7

Valve

8th

Pressure chamber

9

Connection for the print medium

10th

Connecting bolt

11

Valve

12th

Connection for the print medium

13

Pressure chamber

14

15

Valve space

16

Direction of gas flow

17th

Valve space

18th

Outflow direction of the degassed liquid

19th

Valve space

20th

Valve

21

22

23

24th

25th

Connection to the system or circuit

26

27

Valve space

28

Pressure chamber

29

Connection for the print medium

Claims (6)

1. The method and device for degassing liquids, characterized in that a number of valves, of which at least two pinch valves are operated in a logical order that a subset of the liquid to be degassed flows into the device or sucked in, sealed off and with With the help of the negative pressure generated in a valve chamber 17 by the resilience of the hose 1 , possibly with the help of negative pressure in the pressure chamber 8 . The gas escapes through the upper valve 2 , the degassed liquid is returned to the system by reversing the process, closing the valves 11 , then 7 and then 20 . 2. Method and device for degassing liquids according to claim 1, characterized in that to improve gas absorption in Circuit or container the liquid to be degassed with the help of Pinch valves with additional pressure is applied. 3. Method and device for degassing liquids according to the An sayings 1 and 2, characterized in that by using a Sequence control an automatic sequence of the method takes place. 4. The method and device for degassing liquids according to claims 1 to 3, characterized in that a vent valve is arranged at the outlet end 4 . 5. A method and device for degassing liquids according to claims 1 to 4, characterized in that at the outlet end 4 a Ge odor filter, for. B. an activated carbon filter is arranged. 6. Method and device for degassing liquids according to the An sayings 1 to 5, characterized in that the pinch valves by means of Pneumatics, oil or water hydraulics can be operated.