WO2019233708A1

WO2019233708A1 - Breathing mask and filter housing for a breathing mask

Info

Publication number: WO2019233708A1
Application number: PCT/EP2019/062253
Authority: WO
Inventors: Sandra Dankert
Original assignee: Dräger Safety AG & Co. KGaA
Priority date: 2018-06-06
Filing date: 2019-05-14
Publication date: 2019-12-12
Also published as: EP3675969A1; CN112203727A

Abstract

The invention relates to a filter holder (16) for holding a filter element (14) for a breathing mask. On an inlet side (18), the filter holder (16) comprises two planar impact elements (22, 24), which are arranged parallel to and at a distance from each other and are both positioned upstream of a held filter element (14). Each impact element (22, 24) comprises a plurality of longitudinal ribs (26.1, 26.2), between which respective openings (Ö1, Ö2) are formed. Each opening (Ö1) in the one impact element (22) is arranged at a lateral offset to each opening (Ö2) in the other impact element (24) such that at least one curved fluid channel (F1,...) is formed.

Description

DESCRIPTION

Respiratory mask and filter housing for a respiratory mask

The invention relates to a filter holder, which is able to accommodate at least one filter unit. The filter holder and the recorded filter unit belong to a respirator.

Such a respirator allows a user to be in and work in such an environment where the ambient air is contaminated by droplets and / or particulates and / or harmful gases. The or each filter unit of the respirator filters pollutants from the

Ambient air out. The user is therefore supplied with purified ambient air. It is not necessary for the user to carry his own source of breathing air, for example an oxygen cylinder. The respirator can be used for example in a painting line or in a mine or on a construction site or for rescue in case of fire.

The filter housing 7 of DE 93001811 U1 has on one input side a front plate 22 with a plurality of air inlet openings 23. Behind the front plate 22 a plurality of baffles 24 are arranged, each baffle plate 24 is disposed behind each of an air inlet opening 23. Fluid passing through the

Air inlet opening 23 enters, is deflected by the baffle plate 24.

The flameproof filter housing a of DE 734496 receives a filter d and has an inlet opening in the form of an inlet nozzle b. Seen in the direction of entry behind the inlet b are consecutively more

Baffles c arranged, each baffle c each consists of fan-like leaves. As the distance from the flow axis increases, the free cross sections become larger. The baffles c are arranged offset one behind the other. As a result, the air flowing through is deflected several times, and particles are thrown to the baffles c. FIG. 6 of WO 2017/004313 A1 shows a respiratory mask (respirator 300) with two filter housings (filter cartridge housings 60), each of which receives a filter cartridge 1. Each filter housing 60 has a front side (front side 61) and a rear side (rear side 62). A second housing portion 65 on the back 62 has a portion 63 with multiple air passages and is openable and closable relative to the remainder of the filter housing (first housing portion 64). A portion 56 of the remainder 64 has an area 52 with a plurality of openings and pushes the filter cartridge 1 into a receiving structure 66, see Figure 9 and Figure 11. The openings in the areas 63 and 52 can

agree, but this is not necessary.

The invention has for its object to provide a filter receptacle for receiving a filter element for a respirator, which protects the recorded filter element against contamination and is simpler than known filter receptacles, which include protection against contamination built.

The invention is achieved by a filter holder with the features of claim 1. Advantageous embodiments are specified in the subclaims. Relationships used here point to the further development of the subject matter of the main claim by the features of the respective one

Subclaim and should not be construed as a waiver of the provision of independent, objective protection for the combinations of features of the related subclaims. Furthermore, with a view to an interpretation of the claims in a closer specification of a feature in a subordinate claim, it is to be assumed that such a restriction does not exist in the respective preceding claims.

The filter holder according to the invention can accommodate at least one filter element, wherein the filter holder and this filter element to a

Respirator belong.

An inlet side of the filter holder points towards the inflowing fluid. On this input side, the filter holder comprises at least two flat

Impact elements. These two or at least two impact elements are arranged parallel to one another and at a distance from one another. Seen in an inflow direction of incoming fluid, the two impact elements are arranged one behind the other, so that a front and a rear impact element is formed. The or each received filter element is arranged behind the rear impact element and thus behind both impact elements.

Each impact element comprises in each case a plurality of longitudinal webs. Between each two adjacent longitudinal webs of an impact element at least one opening is formed. This opening is permeable to incoming fluid.

It is possible that between two adjacent longitudinal webs a plurality of permeable openings are formed.

Seen in the direction of flow of fluid into the filter receptacle, each opening in the front impact element is laterally offset relative to each opening in the or at least one rear impact element. "Lateral offset" means that in the inflow direction a longitudinal web faces an opening and / or an opening follows a longitudinal ridge. As a result, at least one fluid channel for inflowing fluid is formed. This fluid channel passes through an opening in the front impact element and through a laterally offset opening in the rear impact element.

Thanks to the openings in the two impact elements, ambient air can reach a received filter element from the input side. The

Filter element can clean the ambient air. A user can provide himself with purified breath due to his own breathing effort. Not required thanks to a respirator with the filter unit that a

User carries a breathing air supply.

Through the openings in the impact elements but not only gaseous ambient air, but also solid and liquid particles from the input side get into the interior of the filter holder, for example spray water,

Paint spray, dust particles or other coarse particles. If these solid and liquid particles reach a received filter element, so they contribute to contamination of the filter element. This will increase the ability of the Filter element for filtration reduced. In addition, the respiratory resistance that the wearer of the respirator has to overcome increases.

One way to avoid this undesirable effect is to protect an ingested filter element with an externally accessible prefilter. This pre-filter filters out solid and liquid particles from the incoming ambient air. Thanks to the pre-filter, the or each actual filter element, which is seen arranged in the inflow direction behind the pre-filter, longer use.

A disadvantage of such a prefilter is that the filter holder must then additionally have a receptacle for the prefilter. In addition, the pre-filter must be replaced relatively frequently, which leads to a reduced availability due to the necessary breaks in the operating time. A user must carry several prefilters with them.

The invention achieves the advantage of at least partially protecting a picked-up filter element from solid and liquid particles without requiring a separate pre-filter. Rather, the at least two impact elements with the laterally offset openings themselves act as prefilters. Because no prefilter must be replaced, the availability of a respirator increases with a filter housing according to the invention. However, the invention can also be used in combination with a separate prefilter.

A prefilter increases the resistance to breathing and the weight of the filter intake, especially if the pre-filter absorbs or otherwise absorbs particles. The invention also avoids these disadvantages. Another advantage of a filter according to the invention without pre-filter compared to a

Filter intake with pre-filter is that a filter intake without pre-filter can be easier to produce. Because when Fierstellung a filter holder according to the invention, it is not necessary to mount a receptacle for a pre-filter. A solid or liquid particle, which flows together with the ambient air from the input side into the interior of the filter holder according to the invention, can not impinge straight on a recorded filter element. Rather, this particle is deflected laterally thanks to the laterally offset openings and the or a curved inflow channel. As a result, in many cases the particle either sticks or sticks to a longitudinal web or to another constituent part of the filter receptacle or is reflected back outwards by the filter receptacle. In the other cases, the particle is at least deflected and impinges on the filter element with reduced kinetic energy. The filter holder itself acts as a first separation stage for liquid and solid particles.

The invention provides several degrees of freedom to adapt the filter mount to a given requirement. For example, the width of a longitudinal web, the width of an opening, the lateral offset between the front and rear openings and the distance between the front and the rear impact element can be changed so that on the one hand the breathing resistance remains as low as possible and on the other hand as few

Particles can impinge on a recorded filter element. Preferably, the distance between the front and the rear impact element between 1, 5 mm and 2.5 mm. The distance between two longitudinal webs and thus the width of an opening between these two longitudinal webs is preferably between 2 mm and 3 mm. Preferably, each opening of the rear impact element is arranged behind a longitudinal web of the front impact element. Thanks to the lateral offset and in particular this preferred embodiment, no straight fluid channel is formed from the outside to a recorded filter element. Rather, each fluid channel is bent at least once, so that inflowing ambient air is deflected and preferably vortexed. This embodiment further reduces the risk that an inflowing particle reaches the received filter element. According to the invention, each impact element comprises a plurality of longitudinal webs. In one embodiment, at least one impact element comprises a plurality of transverse webs. These transverse webs are perpendicular or oblique on the longitudinal webs of this impact element. Preferably, the transverse webs and the longitudinal webs of this impact element lie in a plane or surface, so that a lattice structure is formed. According to this embodiment, the transverse webs of this impact element are mechanically connected to one longitudinal web of the or another impact element. This embodiment leads to a particularly high mechanical stability of the filter holder. The risk is reduced that an externally applied mechanical load leads to damage or even breakage of the outer impact element.

Preferably, the filter holder comprises in addition to the at least two

Impact elements a circumferential wall. This peripheral wall surrounds a portion with the two impact elements and a received filter element, preferably completely. The circumferential wall is firmly connected to at least one impact element, preferably with both

Impact elements. The peripheral wall and the two impact elements together at least partially enclose a space in which a

Filter element is received or receivable.

In a further development of this embodiment, the circumferential wall and a portion with the two impact elements are integrally formed, which further increases the mechanical stability. Preferably, these components are even designed monolithic, ie they are made in manufacturing in a single process step. The process step includes, for example, injection molding or casting. This embodiment leads to a rapid and cost-effective production. Various geometric shapes of the longitudinal webs and thus the openings are possible, wherein the filter holder according to the invention may also have a combination of a plurality of geometric shapes. By selecting a desired geometric shape, the filter receptacle can be adapted to an intended use condition. In one embodiment, the filter receptacle according to the invention belongs to a filter housing. This filter housing further comprises a counter element, which is firmly connected to the filter holder according to the invention. The filter holder and the counter element together enclose a fluid-tight space. In this room at least one filter element is added or can be recorded. Preferably, the filter element is firmly connected to the filter holder, for example by means of a mounting foam or other adhesive bond or by adhesive welding. A filter unit comprises a filter housing with an inventive

Filter receptacle and at least one filter element, which is arranged in the interior of this filter housing. A respirator includes one

Mask body and at least one filter unit with a filter receptacle according to the invention. The mask body can be applied to the face of a wearer. The or each filter unit of the respirator is in fluid communication with the interior of the mask body.

In the following the invention will be described with reference to an embodiment. Hereby show:

Figure 1 shows a respirator with a mask body and two

Filter units;

Figure 2 is a sectional view of a filter according to the invention; Figure 3 in a perspective view of a first embodiment of a

Filter holder;

Figure 4 in a viewing direction from the inside a second embodiment of a

Filter holder;

Figure 5 is a sectional view of the second embodiment of Figure 4;

Figure 6 is a perspective view of a third embodiment of a

Filter holder;

Figure 7 is a perspective view of a fourth embodiment of a

Filter holder;

Figure 8 is a sectional view of the fourth embodiment of Figure 7; Figure 9 is a perspective view of a fifth embodiment of a filter holder;

Figure in a perspective view of a sixth embodiment

10 of a filter holder.

FIG. 1 shows a respiratory mask 10, which is configured as a full mask and comprises a mask body 12, which can be positioned on the face of a wearer and is held on the head by straps not shown. A respirator according to the invention 10 can also be used as a Flalbmaske or

Embellished quarter mask. Thanks to the respirator 10, a user can be in a polluted environment without a separate one

Need breathing air supply. The respirator 10 filters

harmful droplets and particles and gases from the incoming ambient air out. The user inhales filtered air.

The respirator 10 of Figure 1 further comprises a centrally disposed filter unit 15 and two laterally arranged filter units 13. Each filter unit 13, 15 each comprise a filter receptacle 16 and a counter element 17. The filter receptacle 16 and the counter element 17 are firmly and fluid-tightly interconnected, for example by a welded joint, and together form a filter housing, which encloses an interior, in which at least one filter element 14 is accommodated. This filter element 14 is shown in FIG. 2 and is designed, for example, as a particle filter or coarse dust filter. The filter element 14 is fixedly mounted in the interior of the filter holder 16, for example by means of mounting foam or another adhesive connection.

It is possible that two different filter elements 14 are arranged in the filter housing 16, 17 in succession, for example, first a coarse dust filter and then a particle filter. The filter unit 13 can therefore as a

Particle filter may be formed, which protects against particles in solid form and in liquid form (droplets) and protects against splashes of liquid particles. The filter unit 13 can also be designed as a combination filter, which also protects against particles in solid and liquid form and additionally against vapors and gases. Each laterally arranged filter unit 13 is fastened to the mask body 12, for example by means of a respective bayonet closure. This

Bayonet closure is preferably arranged in the counter element 17. The centrally arranged filter unit 15 is likewise fastened to the mask body 12 by means of a bayonet closure or, for example, by means of a screw cap. The three filter units 13, 15 are in fluid communication with the interior of the mask body 12.

FIGS. 2 to 10 show different embodiments of a single filter receptacle 16 according to the invention. This belongs to a filter unit 13, 15.

The following components of the filter holder 16 are shown:

the inflow direction E, in which fluid flows from the outside into the filter unit 13 with the filter receiver 16,

- The input side 18 and the output side 20 with respect to the

Inflow direction E,

a received filter element 14,

a front impact element 22,

- A rear impact element 24 and

- A circumferential wall 29, on which outside a plurality of projections 30th

are mounted, which make it easier to rotate the filter holder 16.

The terms "front" and "rear" impact element refer to the inflow direction E. The impact elements 22 and 24 are arranged one behind the other as seen in the inflow direction E. It is also possible that more than two impact elements are arranged one behind the other.

The front impact element 22 comprises a plurality of front longitudinal webs 26. 1 which extend in each case in a longitudinal direction which is perpendicular to the plane of the drawing of FIG. 2 and is arranged horizontally in the plane of the drawing of FIG. 4 and FIG. The rear impact element 24 includes a plurality of rear longitudinal webs 26.2, which are arranged parallel to the front longitudinal webs 26.1. Between two adjacent front longitudinal webs 26.1, a slot-shaped opening Ö1 is formed in each case, between two adjacent rear longitudinal webs 26.2 each have a slot-shaped opening Ö2. The openings Ö1 of the front impact element 22 are relative to the openings Ö2 of rear impact element 24 laterally offset, which is clearly visible in the sectional view of Figure 2. Each front opening Ö1 and at least one

adjacent rear opening Ö2 belong together to a respective fluid channel F1, which is bent relative to the rear openings Ö2 thanks to the lateral offset of the front openings Ö1. Each fluid channel F1,... Directs an air flow, which flows in from the inlet side 18, at least once. This diversion leads to turbulent turbulence in the flow of incoming ambient air.

The longitudinal webs 26.1 of the front impact element 22 are offset laterally relative to the longitudinal webs 26.2 of the rear impact element 24. In a viewing direction parallel to the inflow direction E is located behind each front opening Ö1 each have a rear longitudinal web 26.2, but no rear opening Ö2. An inflowing fluid, in particular ambient air, can

Liquid droplets or larger particles, such as dust particles containing. A droplet or particle either strikes a front longitudinal web 26.1 or passes through a front opening Ö1 and then strikes a rear longitudinal web 26.2. In any event, the droplet or particle strikes a longitudinal ridge 26.1 or 26.2 - or an area outside the openings Ö1, Ö2. In many cases, the droplet or particle will stick or stick to this longitudinal web 26.1 or 26.2 or will be reflected. In any case, the

Moving speed of the droplet or particle is reduced so that droplets or particles do not impinge on the filter unit 13 at all or only with reduced speed.

In one embodiment, the front impact element 22 is fixedly connected to the peripheral wall 29, see. FIG. 2. The rear impact element 24 is firmly connected to the front impact element 22. Or both

Impact elements 22, 24 are connected directly to the wall 29. Preferably, the impact elements 22 and 24 and the wall 29 as a single component, that is integrally formed, more preferably even monolithic, ie this one component 22, 24, 29 is produced in a single process step, for example by injection molding. The longitudinal webs 26.1, 26.2 and thus the resulting openings Ö1, Ö2 may have different shapes. According to the first embodiment, as shown in FIG. 3, each front longitudinal bar 26. 1 has the shape of a bar, and each rear longitudinal bar 26. 2 (not shown in FIG. 3) also has the shape of a bar. The filter receiver 16 of the first embodiment has a circular shape, and each impact element 22, 24 extends in a plane.

The filter holder of the second embodiment, which is shown in Figure 4 and Figure 5, has an oval and tapered shape. This embodiment is particularly well adapted to the shape of the face of a wearer. Figure 4 shows the second embodiment in a viewing direction, which is opposite to the inflow direction E, d. H. the inflow direction E is perpendicular to the

Drawing plane of Figure 4. Figure 5 shows the second embodiment in a

Sectional view, and the inflow direction E lies in the plane of Figure 5. As can be seen in Figure 5, the two impact elements 22, 24 are curved outward. The filter unit is better located in the flank of a user than a user

Filter unit with flat front surface. The curved longitudinal webs 26.1, 26.2 are also rod-shaped, but not parallel to each other. Rather, two adjacent longitudinal webs 26.1 or 26.2 include an acute angle of preferably less than 10 ° between them.

According to the second embodiment, the rear impact element 24 comprises in addition to the longitudinal webs 26.2 a plurality of transverse webs 27.2, which are fixedly connected to the rear longitudinal webs 26.2, so that a grid structure is formed. A plurality of mechanical connecting elements 28 connect the transverse webs 27.2 with the front longitudinal webs 26.1 and extend parallel to

Inlet direction E. As viewed in the direction of view of Figure 4, the front impact element 22 is disposed behind the rear impact element 24, and the front openings Ö1 and the filter element 14 are indicated by dashed lines. This embodiment leads to a particularly high mechanical stability.

In the third embodiment, which is shown in FIG. 6, the front impact element 22 comprises several, in addition to the front longitudinal webs 26 Crossbars 27.1. The front openings Ö1 thereby form a matrix structure with rows and columns. The rear impact element 24, which in the illustration of FIG. 6 is concealed by the front impact element 22, can likewise have a matrix structure with rows and columns or have a different structure.

Figure 7 and Figure 8 show a fourth embodiment, in which the front

Longitudinal webs 26.1 and thus also the front openings Ö1 emanate radiating from a center point M. The inflow direction E is perpendicular to the plane of the drawing of FIG. 7 and lies in the plane of the drawing of FIG. 8. The rear impact element 24 may also have longitudinal webs radiating from a central point or have a different structure.

In the fifth embodiment of Figure 9, the front longitudinal webs 26.1 have the shape of circles or circle segments. These circles or circle segments are arranged concentrically around the midpoint M. The back

Impact element 24 may also have such circles or circle segments or have a different structure. The filter holder 16 in turn has an oval shape, which tapers in one direction. In the sixth embodiment according to FIG. 10, the front longitudinal webs 26.1 and the front openings Ö1 formed thereby are in turn bar-shaped. Several longitudinal webs 26.1 are arranged parallel to each other, more

Longitudinal webs 26.1 radiate from the midpoint M.

LIST OF REFERENCE NUMBERS

Claims

1. filter receptacle (16) for receiving at least one filter element (14) for a respiratory mask (10),

wherein the filter holder (16) on an input side (18), the

inflowing fluid out, at least two planar impact elements (22, 24), wherein the two or at least two impact elements (22, 24)

- parallel to each other,

- with a distance to each other and

- Seen in an inflow direction (E) of inflowing fluid behind one another and in front of a recorded filter element (14)

each impact element (22, 24) in each case comprises a plurality of longitudinal webs (26.1, 26.2), wherein between each two adjacent longitudinal webs (26.1, 26.2) of an impact element (22, 24) at least one opening for permeable fluid (Ö1, Ö2 ), wherein each opening (Ö1) in the one impact element (22) - seen in the inflow direction (E) - relative to each opening (Ö2) in the other

Impact element (24) is arranged laterally offset and wherein at least one fluid channel (F1, ...) is formed by an opening (Ö1) in the one impact element (22) and by a laterally offset opening

(Ö2) in the or another impact element (24) passes.

2. Filter receptacle (16) according to claim 1

characterized in that each opening (Ö2) of the one or one - as seen in the inflow direction (E) - rear impact element (24) behind a longitudinal web (26.1) of the front

Impact elements (22) is arranged.

3. filter holder (16) according to any one of the preceding claims,

characterized in that the one impact element (24.2) comprises a plurality of transverse webs (27.2) which are perpendicular or oblique on the longitudinal webs (26.2) of this impact element (24.2), said transverse webs (27.2) mechanically with at least one

Longitudinal web (26.1) of the or another impact element (22) are connected.

4. filter holder (16) according to any one of the preceding claims,

characterized in that the filter receptacle (16) comprises a circumferential wall (29), wherein the circumferential wall (29)

- The two impact elements (22, 24) surrounds and

- Is firmly connected to at least one impact element (22, 24) and wherein the peripheral wall (29) and the two impact elements (22, 24) together at least partially enclose a space for receiving at least one filter element (14).

5. filter holder (16) according to claim 4,

characterized in that the peripheral wall (29) and the two impact elements (22, 24) are integrally formed, in particular produced by an injection molding process.

6. filter holder (16) according to any one of the preceding claims

characterized in that the or at least two longitudinal webs (26.1, 26.2) and / or openings (Ö1, Ö2) of at least one impact element (22, 24) extend radially outward from an axis (M) of the filter receptacle (16).

7. filter holder (16) according to any one of the preceding claims,

characterized in that the or at least two longitudinal webs (26.1, 26.2) and / or openings (Ö1, Ö2) of at least one impact element (22, 24) are arranged parallel to each other or enclose an angle of at most 10 °.

8. filter holder (16) according to any one of the preceding claims,

characterized in that the or at least two longitudinal webs (26.1, 26.2) and / or openings (Ö1, Ö2) of at least one impact element (22, 24) are arranged concentrically around a point (M) on this impact element (22, 24) ,

9. filter holder (16) according to any one of the preceding claims,

characterized in that the or at least four longitudinal webs (26.1, 26.2) and / or openings (Ö1, Ö2) of at least one impact element (22, 24) are arranged like a matrix in rows and columns.

10. Filter housing comprising

- A filter receptacle (16) according to any one of the preceding claims and - a counter-element (17) which is connected to the filter receptacle (16), wherein the filter receptacle (16) and the counter-element (17) together a space for receiving at least one filter element ( 14) completely fluid-tight surround.

11. Filter unit (13, 15) comprising

a filter housing according to claim 10 and at least one filter element (14), wherein the or each filter element (14) in the space which is enclosed by the filter holder (16) and the counter-element (17) is accommodated.

12. Breathing mask (10) comprising

a mask body (12) attached to the face of a wearer of the

Respirator (10) can be applied, and

at least one filter unit (13, 15) according to claim 11,

wherein the or each filter unit (13, 15) in fluid communication with the

Mask body (12) is.