EP3675966A1 - Protective mask for preventing air pollutants - Google Patents

Protective mask for preventing air pollutants

Info

Publication number
EP3675966A1
EP3675966A1 EP18765828.1A EP18765828A EP3675966A1 EP 3675966 A1 EP3675966 A1 EP 3675966A1 EP 18765828 A EP18765828 A EP 18765828A EP 3675966 A1 EP3675966 A1 EP 3675966A1
Authority
EP
European Patent Office
Prior art keywords
protective mask
mask
filter
heat exchanger
air
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.)
Pending
Application number
EP18765828.1A
Other languages
German (de)
French (fr)
Inventor
John Robert MCGARVA
Ruben Arnold Herman REEKERS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips NV filed Critical Koninklijke Philips NV
Publication of EP3675966A1 publication Critical patent/EP3675966A1/en
Pending legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B9/00—Component parts for respiratory or breathing apparatus
    • A62B9/003—Means for influencing the temperature or humidity of the breathing gas
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/02—Masks
    • A62B18/025—Halfmasks
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B23/00—Filters for breathing-protection purposes
    • A62B23/02—Filters for breathing-protection purposes for respirators
    • A62B23/025—Filters for breathing-protection purposes for respirators the filter having substantially the shape of a mask

Definitions

  • the present utility model generally relates to the field of air purification technology.
  • the present utility model relates to a protective mask for preventing air pollutants with a passive heat exchange function.
  • the technical problem to be solved by the present utility model is to provide a protective mask for preventing air pollutants, which can reduce or even avoid the condensation of water vapor in the interior and in the filter materials of the mask during the mask is worn by the user, and thereby improve the comfort of use by the user.
  • Fig.1 illustrates the wetting condition in a conventional mask in the prior art when the outdoor air is at 10 ° C and 60% RH, which are typical temperate conditions in spring and autumn.
  • Fig. 1 illustrates that the weighted average condition in the mask is above the 100% saturated relative humidity leading to condensation.
  • the ventilation system may be still not enough to prevent condensation.
  • Fig. 2 illustrates the wetting condition in a mask equipped with a ventilation system (e.g., a fan) in the prior art when the outdoor air is at 10 ° C and 60% RH. It can be seen that the ventilation system does not completely solve the condensation problem in the mask.
  • a ventilation system e.g., a fan
  • the present utility model provides a protective mask for preventing air pollutants, comprising:
  • a filter located at an inhaled air inlet on the outer surface of the protective mask and configured to filter pollutants entrained in inhaled air;
  • a heat exchanger located at an exhaled air outlet on the inner surface of the protective mask and configured to absorb heat from the previously exhaled air to warm up the subsequently inhaled air;
  • a mask body connected with the filter and the heat exchanger, the mask body along with the filter and the heat exchanger covering at least the mouth and nose of a user.
  • the mask body is formed of an impermeable material.
  • the protective mask further comprises:
  • the width of the sealing strip is chosen in such a way that a distance between the edge of the protective mask and the facial skin of a user is less than a predetermined value.
  • the protective mask further comprises:
  • a fixing strap disposed on the edge of the mask body to enable the protective mask to be fixed on the head of the user.
  • said filter is a modular and replaceable filter assembly.
  • the present utility model further provides a protective mask for preventing air pollutants, comprising:
  • a filter located on the outer surface of the protective mask and configured to filter pollutants entrained in inhaled air;
  • a heat exchanger located on the inner surface of the protective mask and configured to absorb heat from the previously exhaled air to warm up the subsequently inhaled air;
  • the filter and the heat exchanger cover at least the mouth and nose of a user.
  • the heat exchanger is formed by a layer of a permeable heat-retaining material.
  • the protective mask further comprises:
  • a sealing strip disposed on the edge of the heat exchanger and connecting the edge of the heat exchanger to the edge of the filter, forming a mask body of the protective mask that covers at least the mouth and nose of the user;
  • width of the sealing strip is chosen in such a way that a distance between the edge of the mask body and the facial skin of the user is less than a predetermined value.
  • the protective mask further comprises:
  • a fixing strap disposed on the edge of the mask body to enable the protective mask to be fixed on the head of the user.
  • the filter is a modular and replaceable filter assembly.
  • the present utility model reduces the possibility of the condensation of water vapor in the interior or in the filter materials of the mask by warming up the inhaled air with the exhaled air, and thereby improves the comfort of use for the user. This improvement is more significant in cold weather conditions.
  • Fig.1 illustrates the wetting condition in a conventional mask in the prior art when the outdoor air is at 10 ° C and 60% H;
  • Fig. 2 illustrates the wetting condition in a mask equipped with a ventilation system in the prior art when the outdoor air is at 10 ° C and 60% RH;
  • Fig. 3 illustrates a very basic principle schematic diagram of the protective mask for preventing air pollutants according to an embodiment of the present utility model
  • Fig. 4 illustrates the wetting condition in the protective mask for preventing air pollutants according to an embodiment of the present utility model when the outdoor air is at 10 ° C and 60% RH;
  • FIG. 5 illustrates a schematic top cross-sectional view of the protective mask for preventing air pollutants according to an embodiment of the present utility model
  • FIG. 6 illustrates a schematic top cross-sectional view of the protective mask for preventing air pollutants according to another embodiment of the present utility model.
  • condensation is discomfort to a user and prevents the user from extending the time of wearing the masks.
  • the present utility model overcomes this disadvantage by pre -heating the inhaled air before it actually enters into the interior of the mask. This can be implemented by extracting heat from the exhaled air.
  • Fig. 3 illustrates a very basic principle schematic diagram of the protective mask for preventing air pollutants according to an embodiment of the present utility model, in which it illustrates what happens when the user 1 10, 210 uses a heat exchanger.
  • the hot exhaled air 107, 207 undergoes a heat exchange process 1 12 in a cold heat exchanger to condense into water vapor. Since the heat exchanger is located at a specific location of the protective mask 100, 200, the water vapor can be processed reasonably.
  • the heat exchanger is now warm, and the inhaled air 104, 204 will be warmed up significantly by the heat exchanger after undergoing a filtration process 1 1 1, and thereby its relative humidity as well as the ability of the warm humid air retained in the volume of the protective mask tending to condense are reduced.
  • Fig. 4 illustrates the wetting condition in the protective mask for preventing air pollutants according to an embodiment of the present utility model when the outdoor air is at 10 ° C and 60% RH.
  • Fig. 4 illustrates, in conjunction with Figure 3, outdoor air
  • the final inhaled air 104, 204 entering into the interior of the protective mask 100, 200 is biased towards the outdoor ambient condition 401.
  • the average temperature 405 of the inhaled air 104, 204 will be between 37 ° C and the outdoor ambient temperature (10 ° C).
  • the weighted average condition 407 in the interior of the protective mask 100, 200 will be much lower than the relative humidity (100%) that can prevent condensation. This condition is illustrated with the black triangle in Fig. 4.
  • Fig. 5 illustrates a schematic top cross-sectional view of the protective mask for preventing air pollutants according to an embodiment of the present utility model. It is to be noted that this figure and the following other figures are merely exemplary, and should not be construed as a limitation of the scope of the present utility model.
  • the protective mask 100 mainly comprises a mask body 101, a filter 102, and a heat exchanger 105.
  • the filter 102 is located at an inhaled air inlet 103 on the outer surface of the protective mask 100 and configured to filter pollutants entrained in inhaled air 104.
  • the heat exchanger 105 is located at an exhaled air outlet 106 on the inner surface of the protective mask 100 and configured to absorb heat from the previously exhaled air 107 to warm up the subsequently inhaled air 104.
  • the mask body 101 is connected with the filter 102 and the heat exchanger 105, and the mask body 101 along with the filter 102 and the heat exchanger 105 cover at least the mouth and nose of a user 1 10, wherein the mask body 101 is formed of an impermeable material.
  • the filter 102 may be a modular and replaceable filter assembly (low resistance).
  • the protective mask 100 may further comprise a sealing strip
  • the width of the sealing strip 108 is chosen in such a way that a distance between the edge of the protective mask 100 and the facial skin of the user 1 10 is less than a predetermined value.
  • the protective mask 100 may further comprise a fixing strap
  • both the inhaled air 104 and the exhaled air 107 are filtered by the filter 102, wherein the heat of the exhaled air 107 is retained in a plurality of heat exchange channels of the heat exchanger 105. This will heat up the subsequent inhaled air 104 and reduce its relative humidity and condensation in the interior of the protective mask 100.
  • the protective mask 100 is passive, without a ventilation system, and it operates by warming up the inhaled air 104 entering into the protective mask 100 to prevent condensation.
  • the heat exchanger 105 is cold (end of inhalation) and the user 1 10 begins to exhale, there may be a small amount of condensed water on the heat exchanger 105, which will be collected at a defined location.
  • Fig. 6 illustrates a schematic top cross-sectional view of the protective mask for preventing air pollutants according to another embodiment of the present utility model.
  • the protective mask 200 mainly comprises a filter 202 and a heat exchanger 205.
  • the filter 202 is located on the outer surface of the protective mask 200 and configured to filter pollutants entrained in inhaled air 204.
  • the heat exchanger 205 is located on the inner surface of the protective mask 200 and configured to absorb heat from the previously exhaled air 207 to warm up the subsequently inhaled air 204, wherein the filter 202 and the heat exchanger 205 cover at least the mouth and nose of a user 210.
  • the heat exchanger 205 may be formed by a layer of a permeable heat-retaining material.
  • the filter 202 may also be a modular and replaceable filter assembly (low resistance).
  • the protective mask 200 may further comprise a sealing strip 208.
  • the sealing strip 208 is disposed on the edge of the heat exchanger 205 and connects the edge of the heat exchanger 205 to the edge of the filter 202, for forming a mask body 201 of the protective mask 200 that covers at least the mouth and nose of the user 210, wherein the width of the sealing strip 208 is chosen in such a way that a distance between the edge of the mask body 201 and the facial skin of the user 210 is less than a predetermined value.
  • the protective mask 200 may further comprise a fixing strap 209 disposed on the edge of the mask body 201 to enable the protective mask 200 to be fixed on the head of the user 210.
  • the protective mask 200 is also passive, without a ventilation system.
  • the entire protective mask 200 comprises a permeable filter 202, but also has an additional permeable heat-retaining layer behind the filter 202 as the heat exchanger 205.
  • the heat exchanger 205 may warm up the inhaled air 204 and reduce its relative humidity and condensation in the interior of the protective mask 200.
  • the key elements of the present utility model comprise an air heat exchange functional unit (i.e., a heat exchanger) in which the exhaled air transfers (part of) its heat to the inhaled air entering into the interior of the mask.
  • the inhaled air will be warmed up slightly and its relative humidity will decrease slightly, so as to reduce or eliminate condensation in the interior of the mask.
  • the heat exchanger may also be integrated with the filter.
  • Fig. 3 illustrates a very basic principle schematic diagram of the protective mask for preventing air pollutants according to an embodiment of the present utility model. Under this basic principle, there are many possible embodiments of the present utility model.
  • the key inventive step is that the heat from the exhaled air is not disregarded, but is instead at least partially used to warm up the inhaled air, so as to increase the breathing comfort of the user.
  • the present utility model reduces the possibility of the condensation of water vapor in the interior or in the filter materials of the mask by warming up the inhaled air with the exhaled air, and thereby improves the comfort of use for the user. This improvement is more pronounced in cold weather conditions.

Abstract

A protective mask for preventing air pollutants comprises: a filter located at an inhaled air inlet on the outer surface of the protective mask and configured to filter pollutants entrained in inhaled air; a heat exchanger located at an exhaled air outlet on the inner surface of the protective mask and configured to absorb heat from the previously exhaled air to warm up the subsequently inhaled air; and a mask body connected with the filter and the heat exchanger, the mask body along with the filter and the heat exchanger covering at least the mouth and nose of a user. Another protective mask for preventing air pollutants comprises: a filter located on the outer surface of the protective mask and configured to filter pollutants entrained in inhaled air; and a heat exchanger located on the inner surface of the protective mask and configured to absorb heat from the previously exhaled air to warm up the subsequently inhaled air; wherein the filter and the heat exchanger cover at least the mouth and nose of a user. The present utility model reduces or even avoids condensation in the interior or in the filter materials of the mask during the mask is worn by the user, and thereby improves the comfort of use.

Description

Protective mask for preventing air pollutants
FIELD OF THE UTILITY MODEL
The present utility model generally relates to the field of air purification technology. In particular, the present utility model relates to a protective mask for preventing air pollutants with a passive heat exchange function.
BACKGROUND OF THE UTILITY MODEL
To mitigate the unhealthy effects of air pollution, consumers often wear protective masks to prevent breathing in the harmful components.
The comfort of such protective masks is an important factor for whether wearing these masks or not. The users may experience them as discomfort and would not wear them for extended period.
An important factor of this discomfort is the condensation of water vapor occurred in the interior and in the filter materials of the mask. This is caused by the high humidity of the human breath, and especially common and even worsened if the outdoor temperature is low (e.g., in the cold weather condition). This is because the local environment condition exceeds its saturation point (100% relative humidity) and condensation occurs.
SUMMARY OF THE UTILITY MODEL
The technical problem to be solved by the present utility model is to provide a protective mask for preventing air pollutants, which can reduce or even avoid the condensation of water vapor in the interior and in the filter materials of the mask during the mask is worn by the user, and thereby improve the comfort of use by the user.
In winter, or even in spring and autumn, it is impossible to completely prevent condensation in conventional masks as the warm exhaled air (about 37 degree Celsius (°C), 100% relative humidity (RH)) will mix with the cold inhaled air. The exhaled air is full of water vapor which may then condense within the cavity of the masks. Fig.1 illustrates the wetting condition in a conventional mask in the prior art when the outdoor air is at 10 °C and 60% RH, which are typical temperate conditions in spring and autumn.
Fig. 1 illustrates that the weighted average condition in the mask is above the 100% saturated relative humidity leading to condensation.
Other masks in the prior art devote oneself to improving this situation by using a fan in the masks to provide an additional ventilation system so as to blow air into the mask or to draw air out of the mask.
However, there are at least two problems with the above ventilation system as follows.
- cold ventilated air is discomfort to the user (so, only applicable in summer);
- the ventilation system may be still not enough to prevent condensation.
Fig. 2 illustrates the wetting condition in a mask equipped with a ventilation system (e.g., a fan) in the prior art when the outdoor air is at 10 °C and 60% RH. It can be seen that the ventilation system does not completely solve the condensation problem in the mask.
In Fig. 2, it can be seen that the weighted average condition of the air inside the mask is biased towards the conditions of outdoor air. However, even with this level of fan ventilation system (3 times the user's breathing volume) the weighted average condition of the air inside the mask is still above the saturation point. The problem is even worse if the conditions of outdoor are colder, for example in winter.
In order to solve the above technical problems, the present utility model provides a protective mask for preventing air pollutants, comprising:
- a filter located at an inhaled air inlet on the outer surface of the protective mask and configured to filter pollutants entrained in inhaled air;
- a heat exchanger located at an exhaled air outlet on the inner surface of the protective mask and configured to absorb heat from the previously exhaled air to warm up the subsequently inhaled air; and
- a mask body connected with the filter and the heat exchanger, the mask body along with the filter and the heat exchanger covering at least the mouth and nose of a user.
In an embodiment of the present utility model, optionally, the mask body is formed of an impermeable material.
In an embodiment of the present utility model, optionally, the protective mask further comprises:
- a sealing strip disposed on the edge of the mask body, wherein the width of the sealing strip is chosen in such a way that a distance between the edge of the protective mask and the facial skin of a user is less than a predetermined value.
In an embodiment of the present utility model, optionally, the protective mask further comprises:
- a fixing strap disposed on the edge of the mask body to enable the protective mask to be fixed on the head of the user.
In an embodiment of the present utility model, optionally, said filter is a modular and replaceable filter assembly.
In order to solve the above technical problems, the present utility model further provides a protective mask for preventing air pollutants, comprising:
- a filter located on the outer surface of the protective mask and configured to filter pollutants entrained in inhaled air; and
- a heat exchanger located on the inner surface of the protective mask and configured to absorb heat from the previously exhaled air to warm up the subsequently inhaled air;
wherein the filter and the heat exchanger cover at least the mouth and nose of a user.
In an embodiment of the present utility model, optionally, the heat exchanger is formed by a layer of a permeable heat-retaining material.
In an embodiment of the present utility model, optionally, the protective mask further comprises:
- a sealing strip disposed on the edge of the heat exchanger and connecting the edge of the heat exchanger to the edge of the filter, forming a mask body of the protective mask that covers at least the mouth and nose of the user;
wherein the width of the sealing strip is chosen in such a way that a distance between the edge of the mask body and the facial skin of the user is less than a predetermined value.
In an embodiment of the present utility model, optionally, the protective mask further comprises:
- a fixing strap disposed on the edge of the mask body to enable the protective mask to be fixed on the head of the user.
In an embodiment of the present utility model, optionally, the filter is a modular and replaceable filter assembly.
Compared with the prior art, the present utility model has the following advantages:
The present utility model reduces the possibility of the condensation of water vapor in the interior or in the filter materials of the mask by warming up the inhaled air with the exhaled air, and thereby improves the comfort of use for the user. This improvement is more significant in cold weather conditions.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other features, properties and advantages of the present utility model will become more apparent from the following description in conjunction with the accompanying drawings and embodiments, wherein:
Fig.1 illustrates the wetting condition in a conventional mask in the prior art when the outdoor air is at 10 °C and 60% H;
Fig. 2 illustrates the wetting condition in a mask equipped with a ventilation system in the prior art when the outdoor air is at 10 °C and 60% RH;
Fig. 3 illustrates a very basic principle schematic diagram of the protective mask for preventing air pollutants according to an embodiment of the present utility model;
Fig. 4 illustrates the wetting condition in the protective mask for preventing air pollutants according to an embodiment of the present utility model when the outdoor air is at 10 °C and 60% RH;
FIG. 5 illustrates a schematic top cross-sectional view of the protective mask for preventing air pollutants according to an embodiment of the present utility model; and FIG. 6 illustrates a schematic top cross-sectional view of the protective mask for preventing air pollutants according to another embodiment of the present utility model.
DETAILED DESCRIPTION OF EMBODIMENTS
In short, condensation is discomfort to a user and prevents the user from extending the time of wearing the masks. The present utility model overcomes this disadvantage by pre -heating the inhaled air before it actually enters into the interior of the mask. This can be implemented by extracting heat from the exhaled air.
Fig. 3 illustrates a very basic principle schematic diagram of the protective mask for preventing air pollutants according to an embodiment of the present utility model, in which it illustrates what happens when the user 1 10, 210 uses a heat exchanger. Firstly, the hot exhaled air 107, 207 undergoes a heat exchange process 1 12 in a cold heat exchanger to condense into water vapor. Since the heat exchanger is located at a specific location of the protective mask 100, 200, the water vapor can be processed reasonably.
Secondly, the heat exchanger is now warm, and the inhaled air 104, 204 will be warmed up significantly by the heat exchanger after undergoing a filtration process 1 1 1, and thereby its relative humidity as well as the ability of the warm humid air retained in the volume of the protective mask tending to condense are reduced.
Fig. 4 illustrates the wetting condition in the protective mask for preventing air pollutants according to an embodiment of the present utility model when the outdoor air is at 10 °C and 60% RH. Fig. 4 illustrates, in conjunction with Figure 3, outdoor air
(actually not necessarily only refer to "outdoor" air, as long as it is air outside the mask, as the inhaled air 104, 204) is warmed up to at most 37 °C by the heat exchanger.
However, as the heat exchanger cools down, the final inhaled air 104, 204 entering into the interior of the protective mask 100, 200 is biased towards the outdoor ambient condition 401. Thus the average temperature 405 of the inhaled air 104, 204 will be between 37 °C and the outdoor ambient temperature (10 °C). When the inhaled air 104, 204 mixed with the exhaled air 107, 207 of the user 1 10, 210 having the human breathing condition 403, the weighted average condition 407 in the interior of the protective mask 100, 200 will be much lower than the relative humidity (100%) that can prevent condensation. This condition is illustrated with the black triangle in Fig. 4.
The present utility model will be further described in conjunction with more specific embodiments and the accompanying drawings. In the following description, more details are set forth in order to provide a full understanding of the present utility model. However, the present utility model obviously can be implemented in various ways other than those described above. A person skilled in the art can make similar promotion and deduction according to the actual application without departing from the connotation of the present utility model. Therefore, the scope of the present utility model should not be limited by the content of the specific embodiments.
Embodiment 1
Fig. 5 illustrates a schematic top cross-sectional view of the protective mask for preventing air pollutants according to an embodiment of the present utility model. It is to be noted that this figure and the following other figures are merely exemplary, and should not be construed as a limitation of the scope of the present utility model.
As shown in Fig. 5, the protective mask 100 mainly comprises a mask body 101, a filter 102, and a heat exchanger 105. In particular, the filter 102 is located at an inhaled air inlet 103 on the outer surface of the protective mask 100 and configured to filter pollutants entrained in inhaled air 104. The heat exchanger 105 is located at an exhaled air outlet 106 on the inner surface of the protective mask 100 and configured to absorb heat from the previously exhaled air 107 to warm up the subsequently inhaled air 104. The mask body 101 is connected with the filter 102 and the heat exchanger 105, and the mask body 101 along with the filter 102 and the heat exchanger 105 cover at least the mouth and nose of a user 1 10, wherein the mask body 101 is formed of an impermeable material. Further, the filter 102 may be a modular and replaceable filter assembly (low resistance).
In the embodiment, the protective mask 100 may further comprise a sealing strip
108 disposed on the edge of the mask body 101. The width of the sealing strip 108 is chosen in such a way that a distance between the edge of the protective mask 100 and the facial skin of the user 1 10 is less than a predetermined value.
In the embodiment, the protective mask 100 may further comprise a fixing strap
109 disposed on the edge of the mask body 101 to enable the protective mask 100 to be fixed on the head of the user 1 10.
In summary, for the embodiment, both the inhaled air 104 and the exhaled air 107 are filtered by the filter 102, wherein the heat of the exhaled air 107 is retained in a plurality of heat exchange channels of the heat exchanger 105. This will heat up the subsequent inhaled air 104 and reduce its relative humidity and condensation in the interior of the protective mask 100.
The protective mask 100 is passive, without a ventilation system, and it operates by warming up the inhaled air 104 entering into the protective mask 100 to prevent condensation. When the heat exchanger 105 is cold (end of inhalation) and the user 1 10 begins to exhale, there may be a small amount of condensed water on the heat exchanger 105, which will be collected at a defined location.
Embodiment 2
Fig. 6 illustrates a schematic top cross-sectional view of the protective mask for preventing air pollutants according to another embodiment of the present utility model. As shown in Fig. 6, the protective mask 200 mainly comprises a filter 202 and a heat exchanger 205. In particular, the filter 202 is located on the outer surface of the protective mask 200 and configured to filter pollutants entrained in inhaled air 204. The heat exchanger 205 is located on the inner surface of the protective mask 200 and configured to absorb heat from the previously exhaled air 207 to warm up the subsequently inhaled air 204, wherein the filter 202 and the heat exchanger 205 cover at least the mouth and nose of a user 210. Further, the heat exchanger 205 may be formed by a layer of a permeable heat-retaining material. Furthermore, the filter 202 may also be a modular and replaceable filter assembly (low resistance).
In the embodiment, the protective mask 200 may further comprise a sealing strip 208. The sealing strip 208 is disposed on the edge of the heat exchanger 205 and connects the edge of the heat exchanger 205 to the edge of the filter 202, for forming a mask body 201 of the protective mask 200 that covers at least the mouth and nose of the user 210, wherein the width of the sealing strip 208 is chosen in such a way that a distance between the edge of the mask body 201 and the facial skin of the user 210 is less than a predetermined value.
In the embodiment, the protective mask 200 may further comprise a fixing strap 209 disposed on the edge of the mask body 201 to enable the protective mask 200 to be fixed on the head of the user 210.
In summary, for the embodiment, the protective mask 200 is also passive, without a ventilation system. The entire protective mask 200 comprises a permeable filter 202, but also has an additional permeable heat-retaining layer behind the filter 202 as the heat exchanger 205. The heat exchanger 205 may warm up the inhaled air 204 and reduce its relative humidity and condensation in the interior of the protective mask 200.
In summary, the key elements of the present utility model comprise an air heat exchange functional unit (i.e., a heat exchanger) in which the exhaled air transfers (part of) its heat to the inhaled air entering into the interior of the mask. The inhaled air will be warmed up slightly and its relative humidity will decrease slightly, so as to reduce or eliminate condensation in the interior of the mask. The heat exchanger may also be integrated with the filter.
Fig. 3 illustrates a very basic principle schematic diagram of the protective mask for preventing air pollutants according to an embodiment of the present utility model. Under this basic principle, there are many possible embodiments of the present utility model. The key inventive step is that the heat from the exhaled air is not disregarded, but is instead at least partially used to warm up the inhaled air, so as to increase the breathing comfort of the user.
The present utility model reduces the possibility of the condensation of water vapor in the interior or in the filter materials of the mask by warming up the inhaled air with the exhaled air, and thereby improves the comfort of use for the user. This improvement is more pronounced in cold weather conditions.
Although the present utility model is disclosed in the above preferred embodiments, but it is not intended to limit the present utility model. Any changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the utility model. Therefore, any modifications, equivalent changes and modifications of the above-described embodiments in accordance with the technical scope of the present utility model are intended to be within the scope of the utility model as defined by the appended claims.

Claims

CLAI M S
1. A protective mask (100) for preventing air pollutants, comprising:
a filter (102) located at an inhaled air inlet (103) on the outer surface of the protective mask (100) and configured to filter pollutants entrained in inhaled air (104); a heat exchanger (105) located at an exhaled air outlet (106) on the inner surface of the protective mask (100) and configured to absorb heat from the previously exhaled air (107) to warm up the subsequently inhaled air (104); and
a mask body (101) connected with the filter (102) and the heat exchanger (105), the mask body (101) along with the filter (102) and the heat exchanger (105) covering at least the mouth and nose of a user (1 10).
2. The protective mask (100) of claim 1, wherein the mask body (101) is formed of an impermeable material.
3. The protective mask (100) of claim 2, further comprising:
a sealing strip (108) disposed on the edge of the mask body (101), wherein the width of the sealing strip (108) is chosen in such a way that a distance between the edge of the protective mask (100) and the facial skin of the user (1 10) is less than a predetermined value.
4. The protective mask (100) of any one of claims 1 to 3, further comprising:
a fixing strap (109) disposed on the edge of the mask body (101) to enable the protective mask (100) to be fixed on the head of the user (1 10).
5. The protective mask (100) of claim 1, wherein said filter (102) is a modular and replaceable filter assembly.
6. A protective mask (200) for preventing air pollutants, comprising: a filter (202) located on the outer surface of the protective mask (200) and configured to filter pollutants entrained in inhaled air (204); and
a heat exchanger (205) located on the inner surface of the protective mask (200) and configured to absorb heat from the previously exhaled air (207) to warm up the subsequently inhaled air (204);
wherein the filter (202) and the heat exchanger (205) cover at least the mouth and nose of a user (210).
7. The protective mask (200) of claim 6, wherein the heat exchanger (205) is formed by a layer of a permeable heat-retaining material.
8. The protective mask (200) of claim 7, further comprising:
a sealing strip (208) disposed on the edge of the heat exchanger (205) and connecting the edge of the heat exchanger (205) to the edge of the filter (202), forming a mask body (201) of the protective mask (200) that covers at least the mouth and nose of the user (210);
wherein the width of the sealing strip (208) is chosen in such a way that a distance between the edge of the mask body (201) and the facial skin of the user (210) is less than a predetermined value.
9. The protective mask (200) of any one of claims 6 to 8, further comprising:
a fixing strap (209) disposed on the edge of the mask body (201) to enable the protective mask (200) to be fixed on the head of the user (210).
10. The protective mask (200) of claim 6, wherein the filter (202) is a modular and replaceable filter assembly.
EP18765828.1A 2017-09-01 2018-08-31 Protective mask for preventing air pollutants Pending EP3675966A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201721123030.7U CN207462475U (en) 2017-09-01 2017-09-01 The protective face mask of air pollutants
PCT/EP2018/073418 WO2019043135A1 (en) 2017-09-01 2018-08-31 Protective mask for preventing air pollutants

Publications (1)

Publication Number Publication Date
EP3675966A1 true EP3675966A1 (en) 2020-07-08

Family

ID=62268781

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18765828.1A Pending EP3675966A1 (en) 2017-09-01 2018-08-31 Protective mask for preventing air pollutants

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EP (1) EP3675966A1 (en)
CN (2) CN207462475U (en)
WO (1) WO2019043135A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3856360B1 (en) * 2018-09-27 2022-04-20 Koninklijke Philips N.V. A pollution mask and control method
WO2022068857A1 (en) * 2020-09-30 2022-04-07 The Hong Kong Polytechnic University Air-conditioned facemask

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4620537A (en) * 1985-03-04 1986-11-04 Brown Thomas M Cold weather face mask
GB8923785D0 (en) * 1989-10-23 1989-12-13 Edmunds David M Device
FI87047C (en) * 1991-05-02 1992-11-25 Air Ace Oy Air exchange system for respiratory protection and respiratory protection

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CN207462475U (en) 2018-06-08
CN111132738A (en) 2020-05-08
WO2019043135A1 (en) 2019-03-07

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