GB2031749A - A filter having an automatic gas venting device - Google Patents
A filter having an automatic gas venting device Download PDFInfo
- Publication number
- GB2031749A GB2031749A GB7934500A GB7934500A GB2031749A GB 2031749 A GB2031749 A GB 2031749A GB 7934500 A GB7934500 A GB 7934500A GB 7934500 A GB7934500 A GB 7934500A GB 2031749 A GB2031749 A GB 2031749A
- Authority
- GB
- United Kingdom
- Prior art keywords
- liquid
- filter
- gas
- candle filter
- candle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000013022 venting Methods 0.000 title claims description 17
- 239000007788 liquid Substances 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims description 8
- 238000007872 degassing Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000011148 porous material Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/001—Filters in combination with devices for the removal of gas, air purge systems
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Degasification And Air Bubble Elimination (AREA)
- Coating Apparatus (AREA)
- Filtration Of Liquid (AREA)
Abstract
A filter comprises a filter candle (10) in a housing (1) with a gas vent (5) closed by a float (4) when the liquid level is high enough. A sleeve (6) provides an overflow (8) to induce release of gas bubbles from the liquid by deflection. Float (4) maintains a substantially constant volume of gas above the liquid. <IMAGE>
Description
SPECIFICATION
Candle filter device having an automatic venting device and degassing effect
The present invention relates to candle filter device having an automatic venting device and an arrangement for degassing a liquid to be filtered.
The industrial use of candle filters in which a liquid is forced or sucked into a housing and filtered and purified by a candle filter which may comprise any of a wide variety of materials and filter masses is known. These candle filters are usually built into a system through which the liquid continuously flows. Known candle filters have the disadvantage of requiring a long starting time to remove the gas or air trapped in the filter housing before the filter is put into operation. This starting time is particularly long if the liquid which is to be filtered has previously been degassed and is required to be completely free from gas for further processing. Such liquids are particularly required for coating webs or sheets with photographic emulsions.
It is also known to vent the filter housing by means of a valve which is briefly opened when the filter is to be used so that the air or gas can escape. The filter housing may also be periodically or continuously vented through vent pipes by discharging or sucking a partial stream of the liquid containing the gas through a vent pipe in the upper part of the filter.
To employ this method without considerable complications is only possible if the stream of liquid flowing through the filter need not be accurately metered. Metering would require a complicated procedure for measuring the partial stream and exact control of the rate of flow. In many cases it is also desired to obtain exactly the same dwell time for every particle of liquid in the system in order to obtain uniform product quality. If a partial stream is removed from the filter and then returned to it, it has a longer dwell time in the system, and this affects the properties of the product if it contains substances which react with each other in the liquid.
It is an object of the present invention to provide an apparatus and a process by which a candle filter can be continuously and automatically vented and the liquid can at the same time be degassed.
According to the present invention there is provided a filter device for a liquid, the device having a degassing effect on the liquid and comprising a candle filter, a filter housing and an automatic venting device, the automatic venting device comprising a float and a venting nozzle adapted to be closed by the float which are arranged in the filter housing so as to maintain in use a substantially constant volume of gas above the liquid to be filtered.
In an improved embodiment, it was found to be advantageous to arrange an open topped cylinder between the filter housing and candle filter with its open top edge ending in the volume of gas.
According to a further aspect of the present invention there is provided a process for the automatic venting of a candle filter device designed to have a degassing effect during the filtering of a liquid wherein a float located above the candle filter in a filter housing is moved upwards towards a venting nozzle by the liquid to be filtered, the discharge of gas being automatically regulated, and large air bubbles are released by deflection at the edge of a cylinder and any small air bubbles still remaining in the liquid to be filtered collect in front of the candle filter and coalesce to form larger air bubbles which are carried upwards by their own upthrust through the cylinder round the candle filter into a volume of gas.
It has surprisingly been found that this arrangement can be used for continuous, automatic venting of the candle filter. The open ended cylinder inserted in the filter housing can efficiently remove gas from a liquid which was not previously or not completely degassed. This apparatus and the process provide a simple means of solving the problem and eliminating the technical difficulties previously existing.
An embodiment of the apparatus according to the invention is shown by way of example in the drawing, in which:
Figure 1 illustrates the structure and function of the continuously and automatically operating candle filter with venting and degassing arrangement.
When a candle filter (10) of Fig. 1 is put into operation, the liquid enters the filter through an inlet (7). A float (4) rests on a screw lid (2) and is vertically supported on a guide pin (3). A venting nozzle (5) is therefore free and air can escape through it. As the liquid level rises, it lifts the supported float (4) so that nozzle (5) is closed. The float is advantageously designed so that a volume of gas (9) is left in the upper part of the filter housing (1). The liquid then flows over the overflow to edge (8) of a cylinder (6), passes through the pores of the filter layer of the candle filter (10) and leaves as purified liquid through an outlet (11).
The liquid is degassed as follows:
Bubbles of gas introduced through the inlet (7) with the liquid are carried through the annular gap formed between the housing (1) and cylinder (6) to the overflow edge (8) of the cylinder (6) and at the sharp deflection they escape into the volume of gas (9) maintained by the float (4). The partially degassed liquid then enters the annular gap between the cylinder (6) and candle filter (10) and flows through the pores of the candle filter (10) to the outlet (11). Any gas bubbles still left in the liquid after the overflow edge (8) adhere to the external surface of the candle filter (10) because of the small size of the pores. These candle filters have pores measuring from 0.005 to 0.02 mm, through which gas bubbles cannot pass. The gas bubbles collect on the external circumference of the candle filter and coalesce to form larger gas bubbles which then rise due to the upthrust on them and, guided by the cylinder (6), they enter the volume of gas (9).
The process and apparatus according to the invention are universally applicable to all liquids and the apparatus is simple to manufacture or can be produced by conversion of ordinary commercial candle filter. The apparatus requires little servicing, and this can be done when replacing the candle filter.
Claims (5)
1. A filter device for a liquid, the device having a degassing effect on the liquid and co prising a candle filter, a filter housing and an automatic venting device, the automatic venting device comprising a float and a venting nozzle adapted to be closed by the float which are arranged in the filter housing so as to maintain in use, a substantially constant volume of gas above the liquid to be filtered.
2. A device as claimed in Claim 1, further comprising a cylinder arranged between the filter housing and the candle filter, the cylinder having an open top whose upper edge is arranged to end in the gas volume maintained above the liquid when the device is in use.
3. A filter device for a liquid substantially as herein described with reference to the accompanying drawings.
4. A process for the automatic venting of a candle filter device designed to have a degassing effect during the filtering of a liquid wherein a float located above the candle filter in a housing is moved upwards towards a venting nozzle by the liquid to be filtered, the discharge of gas being automatically regulated, and large air bubbles are released by deflection at the edge of a cylinder and any small air bubbles still remaining in the liquid to be filtered collect in front of the candle filter and coalesce to form larger air bubbles which are carried upwards by their own upthrust through the cylinder round the candle filter into a volume of gas.
5. A process for the automatic venting of a candle filter device substantially as herein described with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2843156A DE2843156C2 (en) | 1978-10-04 | 1978-10-04 | Process for the automatic simultaneous degassing and filtering of a liquid and device for carrying out the process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2031749A true GB2031749A (en) | 1980-04-30 |
Family
ID=6051292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7934500A Withdrawn GB2031749A (en) | 1978-10-04 | 1979-10-04 | A filter having an automatic gas venting device |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5549116A (en) |
| DE (1) | DE2843156C2 (en) |
| FR (1) | FR2437861A1 (en) |
| GB (1) | GB2031749A (en) |
| IT (1) | IT1119867B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5449454A (en) * | 1993-01-13 | 1995-09-12 | Aquaria, Inc. | Gas expelling device for a canister type filter |
| GB2316631A (en) * | 1996-08-30 | 1998-03-04 | Lucas Ind Plc | Separator for use in a fuel system |
| CN115814542A (en) * | 2023-02-15 | 2023-03-21 | 北京精仪天和智能装备有限公司 | High-temperature nitrogen oxide treatment system containing ultrafine powder |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3108948C2 (en) * | 1981-03-10 | 1984-06-28 | Argo GmbH für Feinmechanik, 7527 Kraichtal | Liquid filters, in particular for hydraulic media |
| DE4036950A1 (en) * | 1990-11-20 | 1992-05-21 | Bosch Gmbh Robert | Supplying sterilising liq. to packing containers - involves through-flow measuring instrument and degasification device to remove bubbles |
| FR2684894B1 (en) * | 1991-12-16 | 1994-03-18 | Labinal Precision Mecanique | GAS FILTER. |
| DE19501896A1 (en) * | 1995-01-23 | 1996-07-25 | Knecht Filterwerke Gmbh | Edge filter for liquids |
| WO2002086331A1 (en) | 2001-04-17 | 2002-10-31 | Shin Caterpillar Mitsubishi Ltd. | Fluid pressure circuit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE963865C (en) * | 1953-08-29 | 1957-05-16 | Fram Corp | Filters for liquid hydrocarbons and similar liquids |
| DE1105848B (en) * | 1954-04-30 | 1961-05-04 | Bosch Gmbh Robert | Liquid filter |
| US3283477A (en) * | 1964-09-28 | 1966-11-08 | Bendix Corp | Fueler unit |
| GB1492431A (en) * | 1975-02-01 | 1977-11-16 | Neil & Spencer Ltd | Filter units for dry cleaning machines |
-
1978
- 1978-10-04 DE DE2843156A patent/DE2843156C2/en not_active Expired
-
1979
- 1979-10-02 IT IT50432/79A patent/IT1119867B/en active
- 1979-10-02 JP JP12648879A patent/JPS5549116A/en active Pending
- 1979-10-04 GB GB7934500A patent/GB2031749A/en not_active Withdrawn
- 1979-10-04 FR FR7924762A patent/FR2437861A1/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5449454A (en) * | 1993-01-13 | 1995-09-12 | Aquaria, Inc. | Gas expelling device for a canister type filter |
| GB2316631A (en) * | 1996-08-30 | 1998-03-04 | Lucas Ind Plc | Separator for use in a fuel system |
| CN115814542A (en) * | 2023-02-15 | 2023-03-21 | 北京精仪天和智能装备有限公司 | High-temperature nitrogen oxide treatment system containing ultrafine powder |
| CN115814542B (en) * | 2023-02-15 | 2023-05-02 | 北京精仪天和智能装备有限公司 | High-temperature nitrogen oxide treatment system containing superfine powder |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2843156A1 (en) | 1980-04-10 |
| DE2843156C2 (en) | 1983-01-27 |
| IT1119867B (en) | 1986-03-10 |
| IT7950432A0 (en) | 1979-10-02 |
| JPS5549116A (en) | 1980-04-09 |
| FR2437861A1 (en) | 1980-04-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |