DE4010560A1 - Air filter arrangement for bulk solids e.g. cement - has valve systems to prevent ingress of rainwater - Google Patents

Abstract

When large quantities of bulk solids such as cement are stored in containers, moist air filters can be blocked by dust. The novelty is that the filter housing fitted to the storage container has an inlet air valve between storage tank and filter, and an outlet valve between filter and ambient air, arranged to exclude rainwater. USE/ADVANTAGE - The filter cannot be moistened by rain which might cake dust on and block the filter.

Description

The invention relates to a filter arrangement for Large containers with air inlet and outlet possible keiten.  

Such filter arrangements are on large containers arranged, for example for agricultural and chemical products and free-flowing building materials. With this When filling, air escapes, but it contains dust and therefore be filtered before exiting outdoors got to. On the other hand, when bulk goods are removed air from the outside into the container can. So far, this has inevitably also been done by Filters, i.e. in the opposite direction as when filling. If the air now contains moisture, the filter use moist. This can cause caking of filter dust to lead. This affects the filter effect. At dusty goods that solid together with moisture It forms crusts, such as with cement considerable problems.

The invention has for its object a Propose filter arrangement in which the filter through moist air or rain in no operating condition from the outside is moistened. The following features are in accordance with the invention intended:

• - It is a housing for filters and air flow intended;
• - The interior of the housing communicates with the Container interior;
• - A filter is arranged in the housing;
• - on the flow side outside the filter is one Ventilation opening provided;  
• - The vent opening is a check valve assigned in such a way that only air escapes;
• - on the flow side in front of the filter is one against rain protected air inlet opening provided;
• - The air inlet opening is a check valve assigned, which is only air inside the case lets enter.

It is now spatial in the area of the filter Separation of the openings from entering and exiting Air provided. These are arranged so that outflowing Air passes through the filter, but incoming air on Filters can pass directly into the container and thus the filter may not be wet immediately wetted. The check valves ensure that the each other flow path in the different Operating states in a simple way. The used Check valves can automatically close flaps be. Further configurations and details, advantages and features of the invention are also in the others Claims and the following, based on the drawings included in the description section.  

An embodiment of the invention is as follows explained in more detail with reference to the drawings.

It shows

Fig. 1 The side view of a filter arrangement arranged on an only indicated container, partly in a sectional view;

Fig. 2 is a horizontal section along the line 2-2 in Fig. 1 through the area of the upper check valve.

On a large container 11 , of which only a small part of the roof is shown, the filter arrangement 10 is fastened in an air-tight and moisture-tight manner. The Filteran arrangement has a housing 12 , which consists of four ring parts 12.1 to 12.4 . These are sealed together with connecting and sealing rings 13 . Clamping devices and / or screws of conventional design can be provided.

In the lower ring part 12.1 , an air inlet opening 14 is provided in an air inlet pipe 15 . This is through the wall of the ring part 12.1 , fixed in a suitable recess and - as can be seen - arranged so that its outer end 15.1 is inclined downwards so that any rain that may get in can run off. At its inner end 15.2 it is cut off normal to the longitudinal axis and has a loosely placed check valve 17 which fully covers the pipe end serving as a sealing seat 16 . It is articulated with an articulated lever 18 on a fixed bearing 19 in the interior of the ring part 12.1 , so that when the pressure from inside the check valve 17 is pressed by gravity and air pressure onto the sealing seat 16 at the pipe end 15.2 and thus seals. When air enters due to a suction effect, the non-return flap 17 can lift off as required.

In the middle ring part 12.2 , a conventional filter 20 is provided, which has a closed bottom 21 and an upper fastening area 22 , with which it is fastened airtight in the housing 12 . As can be seen, it has an air outlet opening 23 at the top in the center. Its filter walls 24 can be formed in various known ways, so that air flowing into the annular space 25 from below is forced through the filter walls 24 , as indicated by the arrows 26 . The filter 20 can be clamped at the top in the area of the sealing rings 13.1 with the assembly of the housing or can also be used separately. A calming space 27 is formed in the ring part 12.3 located above. The filter 20 can also be made firm on the upper ring part 12.3 .

The upper closure part 30 sits on the ring part 12.3 . For this purpose, the ring part 12.4 has a roof wall 31 . In this, the vent opening 32 is formed with an annular collar 33 with a smaller diameter. On top of this lies the horizontal ventilation flap 35 , which forms the check valve of the ventilation opening 32 . It is articulated with an articulated lever 36 on a fixed bearing 37 in such a way that when air escapes, as indicated by dashed lines, it can rise and let the air escape. To prevent the entry of rain, a cambered cover cap 38 is arranged on the entire arrangement, which has a slightly larger diameter than the ring parts 12.1 to 12.4 and which allows an annular air outlet through the outlet space 39 . As is apparent the flow side is provided outside of the filter 20, the vent opening 32 and provided with a check valve 35, 36, 37, while the flow side formed the protected against rain air inlet opening 14 with the check valve 17, 18, 19 upstream of the filter 20th

The structure is simple and reliable. The new Filter arrangement can be on any container, if necessary can be retrofitted.  

In order to influence the internal pressure in the container and to improve the closing force of the check valve 35 , 36 , 37 at the vent opening 32 , the closing force can be influenced, possibly adjustable or exchangeable, such as springs and / or weights.

The summary printed below is part of the disclosure of the invention: A filter ( 20 ) is installed in the housing ( 12 ) of the filter arrangement ( 10 ). On the flow side in front of the filter ( 20 ) sitting on the roof of a container ( 11 ), an air inlet opening ( 14 ) with a non-return flap ( 17 ) is arranged so that it is protected from the rain. On the flow side after the filter ( 20 ) on the roof ( 31 ) of the filter arrangement ( 10 ) there is a ventilation opening ( 32 ) with a non-return valve formed by a ventilation flap ( 35 ) on articulated parts ( 36 , 37 ). The whole is finished with a rain-protecting cover ( 38 ) that allows air to escape.

Reference symbol list

10 filter arrangement
11 large containers
12 housing
12.1 lower ring part
12.2 middle ring part
12.3 upper ring part
12.3 upper ring part
13 Connection and sealing ring
13.1 sealing ring
14 air inlet opening
15 air inlet pipe
15.1 outer end of 15
15.2 inner end of 15 / pipe end
16 sealing seat
17 check valve
18 articulated lever
19 bearings
20 filters
21 floor
22 upper fastening area
23 air outlet opening
24 filter wall
25 annulus
26 arrow
27 relaxation room
30 upper closure part
31 roof wall / roof
32 ventilation opening
33 collar
35 ventilation flap
36 articulated lever
37 bearings
38 cover cap
39 exit space

Claims (10)

1. Filter arrangement for large containers with air inlet and air outlet options characterized by the following features:

• - A housing ( 12 ) for the filter ( 20 ) and air duct is provided;
• - The interior of the housing communicates with the container interior;
• - A filter ( 20 ) is arranged in the housing;
• - A ventilation opening ( 32 ) is provided on the flow side outside the filter;
• - The vent opening is a check valve ( 35 , 36 , 37 ) assigned such that only air leakage occurs;
• - On the flow side in front of the filter ( 20 ) an air inlet opening ( 14 ) protected against rain is provided;
• - The air inlet opening is assigned a check valve ( 17 , 18 , 19 ) which only allows air to enter the interior of the housing.

2. Filter arrangement according to claim 1, characterized in that the housing ( 12 ) is designed as an elongated component placed on the container roof ( 11 ) and the ventilation opening ( 32 ) is arranged in an upper roof wall ( 31 ). 3. Filter arrangement according to one of the other claims, characterized in that the air inlet opening ( 14 ) is formed in an outwardly inclined air inlet tube ( 15 ), the end face lying inside the housing (sealing seat 16 ) is covered by a movable check valve ( 17 ) . 4. Filter arrangement according to one of the other claims, characterized in that the ventilation opening ( 32 ) with the outlet valve at the upper end of the housing ( 12 ) is covered by a weather protection cap ( 38 ). 5. Filter arrangement according to one of the other claims, characterized in that the vent flap ( 35 ) on the vent opening ( 32 ) is equipped with means influencing the closing force. 6. Filter arrangement according to claim 5, characterized, that weights are provided. 7. Filter arrangement according to claim 5, characterized, that adjustable or interchangeable springs are provided are. 8. Filter arrangement according to one of the other claims, characterized in that the housing ( 12 ) is formed from a plurality of annular, superimposed components ( 12.1 ; 12.2 ; 12.3 ; 12.4 ). 9. Filter arrangement according to one of the other claims, characterized in that a filter cleaning device is provided above the filter ( 20 ) in a housing part ( 12.3 ). 10. Filter arrangement according to one of the other claims, characterized in that the housing parts ( 12.1 to 12.4 ) are connected to one another with sealing and connecting rings ( 13 ).