CN110960813B - Micro-positive pressure protective hood with secondary filtering and air suction functions - Google Patents
Micro-positive pressure protective hood with secondary filtering and air suction functions Download PDFInfo
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- CN110960813B CN110960813B CN202010091480.2A CN202010091480A CN110960813B CN 110960813 B CN110960813 B CN 110960813B CN 202010091480 A CN202010091480 A CN 202010091480A CN 110960813 B CN110960813 B CN 110960813B
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- ring structure
- valve core
- hood
- core part
- hood body
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- 238000001914 filtration Methods 0.000 title claims abstract description 57
- 230000001681 protective effect Effects 0.000 title claims abstract description 17
- 230000029058 respiratory gaseous exchange Effects 0.000 claims abstract description 22
- 230000000670 limiting effect Effects 0.000 claims description 23
- 239000012528 membrane Substances 0.000 claims description 8
- 241000700605 Viruses Species 0.000 abstract description 5
- 241000894006 Bacteria Species 0.000 abstract description 4
- 206010011985 Decubitus ulcer Diseases 0.000 abstract description 4
- 208000004210 Pressure Ulcer Diseases 0.000 abstract description 4
- 239000012535 impurity Substances 0.000 abstract description 3
- 238000007373 indentation Methods 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 description 5
- 239000004744 fabric Substances 0.000 description 5
- 229920000742 Cotton Polymers 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 206010011409 Cross infection Diseases 0.000 description 1
- 206010029803 Nosocomial infection Diseases 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- A62B18/04—Gas helmets
- A62B18/045—Gas helmets with fans for delivering air for breathing mounted in or on the helmet
-
- 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
-
- 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
- A62B18/08—Component parts for gas-masks or gas-helmets, e.g. windows, straps, speech transmitters, signal-devices
- A62B18/082—Assembling eyepieces, lenses or vision-correction means in or on gas-masks
-
- 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
- A62B18/08—Component parts for gas-masks or gas-helmets, e.g. windows, straps, speech transmitters, signal-devices
- A62B18/10—Valves
-
- 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
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Pulmonology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Zoology (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
Abstract
The micro-positive pressure protective hood with the secondary filtering and air suction functions comprises a hood body, wherein a window is arranged at the front part of the hood body, a tightening and fixing device is arranged at the lower part of the hood body, an air supply device is arranged outside the hood body, a primary filtering device is arranged in the air supply device, a secondary filtering device is arranged in the hood body, a breathing tube is arranged between the secondary filtering device and the air supply device, and the secondary filtering device is communicated with the air supply device through the breathing tube; the hood body is also provided with an exhaust filtering device. The invention can carry out omnibearing protection on the head of medical staff without wearing a mask or goggles, avoids pressure sores and indentations on the face of the medical staff, increases the comfort of the medical staff, carries out primary filtration on air by the primary filtration device in the air supply device, and carries out secondary filtration on the air by the secondary filtration device arranged in the head cover body, thereby fully filtering impurities, bacteria, viruses and the like in the air and having high safety.
Description
Technical Field
The invention relates to the technical field of medical appliances, in particular to a micro-positive pressure protective hood with a secondary filtering and air suction function.
Background
At present, in order to protect the medical staff, most of the medical staff wear a mask or are protected by goggles, the protection is relatively limited, such as the head, the ears and other parts cannot be protected, the wearing is complicated, and the problems of pressure sores, pressure marks and the like on the face of the medical staff are easy to occur; the traditional protective clothing putting on and taking off process is complicated, the time consumption is long, and the whole body is in the protective clothing, so that the protective clothing is stuffy.
Therefore, the protective hood has been developed, and an air supply device is arranged outside the protective hood, and the air supply device generally comprises a motor, a fan, a primary filter device, a lithium battery, a circuit board and the like, and the air supply device sends air into the protective hood, but the safety of the filter form is poor, and when the motor is damaged or the motor is not powered, if the motor is once in failure or the battery is not powered, viruses or polluted air still can enter a human body through a pipeline connected with the motor.
Disclosure of Invention
The invention aims at: the micro-positive pressure protective hood with the secondary filtering and air suction functions is provided, and air is subjected to secondary filtering, so that the safety is high.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The micro-positive pressure protective hood with the secondary filtering and air suction functions comprises a hood body, wherein a window is arranged at the front part of the hood body, a tightening and fixing device is arranged at the lower part of the hood body, an air supply device is arranged outside the hood body, a primary filtering device is arranged in the air supply device, a secondary filtering device is arranged in the hood body, a breathing tube is arranged between the secondary filtering device and the air supply device, and the secondary filtering device is communicated with the air supply device through the breathing tube; the hood body is also provided with an exhaust filtering device.
The secondary filter device comprises an upper cover and a lower cover, the upper cover is fixedly connected with the lower cover, and a secondary filter element is arranged between the upper cover and the lower cover; the upper cover is provided with a first through hole for filtered air to pass through, and the lower cover is communicated with the breathing tube.
One side of the lower cover, which is far away from the secondary filter element, is provided with a convex column, a second through hole is arranged in the convex column, and the breathing tube is detachably and fixedly connected with the convex column.
One side of the lower cover, which is close to the secondary filter element, is provided with a stepped groove, and the secondary filter element is arranged on the step of the stepped groove.
The bottom surface of one side of lower cover that is close to the second grade filter core is equipped with down the supporting rib, and the quantity of lower supporting rib is a plurality of and evenly sets up along the circumference of lower cover at intervals, and lower supporting rib and second grade filter core contact.
And a one-way valve is arranged in the second through hole.
The one-way valve comprises a valve seat and a valve core, the valve core is arranged on the valve seat, and the valve seat is arranged in the second through hole; the valve seat comprises an outer ring structure, an inner ring structure is arranged in the outer ring structure, and a plurality of connecting ribs which are arranged at intervals are fixedly connected between the outer ring structure and the inner ring structure; the valve core comprises a valve core column, one end of the valve core column is provided with an elastic baffle plate, the valve core column is arranged in the inner ring structure and matched with the inner ring structure, and the inner side surface of the baffle plate is attached to the end surface of the outer ring structure.
The valve core column comprises a first valve core part, a second valve core part and a third valve core part which are sequentially arranged, the outer diameter of the second valve core part is larger than that of the first valve core part and that of the third valve core part, the second valve core part is in interference fit with the inner ring structure, the second valve core part is longer than the inner ring structure, the difference between the length of the second valve core part and the length of the inner ring structure is recorded as L, and the range of L is 0.3 mm-0.5 mm; the inner side surface of the baffle plate is contacted with the end surface of the inner ring structure; a conical limiting block is arranged between the first valve core part and the second valve core part, and one end, close to the baffle, of the limiting block is larger than one end, deviating from the baffle, of the limiting block; the periphery of the valve seat is provided with a plurality of protruding rings which are arranged at intervals, the protruding rings are in interference fit with the second through holes, limiting rings are arranged in the second through holes, and the limiting rings are in contact with the protruding rings close to the baffle plates.
The upper cover comprises an outer ring structure, a middle ring structure and an inner core structure which are sequentially arranged from outside to inside, and a plurality of connecting rods are fixedly connected between the outer ring structure and the middle ring structure and between the middle ring structure and the inner core structure; the outer ring structure is fixedly connected with the lower cover; a plurality of spacing protrusions which are arranged at intervals are arranged on one side of the middle ring structure, which is close to the secondary filter element; and a limiting bulge is also arranged on one side of the inner core structure, which is close to the secondary filter element.
The exhaust filtering device comprises an exhaust hole arranged on the head cover body, and a filtering membrane is arranged at the exhaust hole; the tightening and fixing device is an elastic belt.
The invention can carry out omnibearing protection on the head of medical staff without wearing a mask and goggles, avoids pressure sores and indentations on the face of the medical staff, increases the comfort of the medical staff, carries out primary filtration on air by the primary filtration device in the air supply device, and carries out secondary filtration on the air by the secondary filtration device in the head cover body, thereby fully filtering impurities, bacteria, viruses and the like in the air with high safety; the one-way valve can enable air in the secondary filtering device to flow unidirectionally, when the air supply device works, the air subjected to primary filtering enters the second through hole through the breathing pipe, then enters the interval between the outer ring structure and the inner ring structure, pushes the baffle plate, and the baffle plate deforms outwards, so that the one-way valve is opened, the air is subjected to secondary filtering through the secondary filtering filter element, and then flows into the hood from the first through hole of the upper cover; when the air supply device is damaged or is not powered, the one-way valve is closed, so that air mixed with impurities, bacteria, viruses and the like is prevented from entering the hood.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a partial cross-sectional view of the present invention;
FIG. 3 is a schematic diagram of a secondary filter device;
FIG. 4 is a schematic diagram of a secondary filter device;
FIG. 5 is an enlarged schematic view at B in FIG. 4;
FIG. 6 is a schematic view of the one-way valve in an open state;
FIG. 7 is a schematic structural view of a spool column;
FIG. 8 is a schematic view of the valve seat;
FIG. 9 is a schematic view of the structure of the lower cover;
fig. 10 is a schematic structural view of the upper cover.
Detailed Description
As shown in fig. 1 to 10, a micro-positive pressure protective hood with a secondary filtration and inhalation function comprises a hood body 1, wherein a window 7 is arranged at the front part of the hood body 1, a transparent pe sheet is adopted for the window 7, the window 7 is fixedly connected with the hood body 1, a large window is preferentially adopted, the whole face of medical staff can be displayed, the medical staff can observe conveniently, a tightening and fixing device 4 is arranged at the lower part of the hood body 1, an air supply device 3 is arranged outside the hood body 1, a primary filter device is arranged in the air supply device 3, the air supply device 3 further comprises a motor, a fan, a lithium battery and a circuit board, the lithium battery supplies power for the circuit board, the motor controls the motor to work, the fan drives the fan to work, the fan inhales air and filters the air through the primary filter device, the air is not repeated in the prior art, in addition, the air supply device 3 can adopt an electric air supply breathing system sold in various markets, as shown in fig. 2, the hood body 1 is internally provided with a secondary filter device 5, in fig. 2, the secondary filter device 5 is preferentially adopted for cutting a track, namely, the secondary filter device 5 is fixedly connected in the hood body 1, shaking is avoided in the use, the secondary filter device 3 is communicated with the secondary filter device 2, and the secondary filter device 3 is communicated with the secondary filter device 2; the hood body 1 is also provided with an exhaust filtering device 6.
The secondary filter device 5 and the window 7 are arranged on the same side of the head cover body 1 and below the window 7, and part of the space from the secondary filter device 5 is blown to the window 7 to prevent fog from occurring on the window 7, and the exhaust filter device 6 is arranged at the rear part of the head cover body 1.
The secondary filter device 5 comprises an upper cover 51 and a lower cover 58, wherein the upper cover 51 is fixedly connected with the lower cover 58, and common connection modes such as ultrasonic welding, buckling connection and the like are preferably selected, and a secondary filter element 54 is arranged between the upper cover 51 and the lower cover 58; the upper cover 51 is provided with a first through hole 514 for the filtered air to pass through, the lower cover 58 is communicated with the breathing tube 2, and the lower cover 58 is fixedly connected with the head cover body 1.
The secondary filter element 54 adopts a composite filter membrane, the structural form of the composite filter membrane is diversified, and the composite filter membrane can adopt a first non-woven cloth layer, a first melt-blown cloth layer, a second melt-blown cloth layer, an electrostatic cotton layer and a second non-woven cloth layer which are sequentially laminated from outside to inside; the composite filtering membrane may also adopt a first nonwoven fabric layer, a first electrostatic cotton layer, a melt-blown fabric layer, a second electrostatic cotton layer and a second nonwoven fabric layer which are laminated in order from outside to inside, wherein the outside refers to the side of the secondary filtering core 54 close to the breathing tube 2.
The side of lower cover 58 that deviates from second grade filter core 54 is equipped with protruding post 56, is equipped with the second through-hole in protruding post 56, and protruding post 56 can dismantle fixed connection with breathing tube 2, and the preferential common connected forms such as lock connection, threaded connection that use can be equipped with the external screw thread outside protruding post 56, and the one end that is close to protruding post 56 of breathing tube 2 is equipped with the internal screw thread, breathing tube 2 and protruding post 56 threaded connection, convenient connection.
The breathing tube 2 preferably has a threaded tube structure, and the inner wall is smooth, and the outer wall has a threaded structure, so that wind resistance is reduced when the air in the breathing tube flows.
The side of lower cover 58 that is close to second grade filter core 54 is equipped with the ladder groove, and second grade filter core 54 sets up on the step 59 in ladder groove, and the placement of second grade filter core 54 of being convenient for, the ladder groove includes upper groove and lower groove, and the lower groove sets up the bottom at the upper groove, and the shape of second grade filter core 54 suits with the shape of upper groove, covers the top of lower groove totally, and the second through-hole of protruding post 56 communicates with lower groove, upper groove in proper order.
The bottom surface of the side of the lower cover 58, which is close to the secondary filter element 54, is provided with lower supporting ribs 55, the number of the lower supporting ribs 55 is a plurality of and the lower supporting ribs 55 are uniformly arranged at intervals along the circumferential direction of the lower cover 58, the lower supporting ribs 55 are in contact with the secondary filter element 54, and the lower supporting ribs 55 play a supporting role.
A check valve 57 is installed in the second through hole, and the check valve 57 can enable the air in the secondary filter device 5 to flow unidirectionally.
The check valve 57 includes a valve seat and a valve core, the valve core is mounted on the valve seat, and the valve seat is mounted in the second through hole; the valve seat comprises an outer ring structure 574, an inner ring structure 578 is arranged in the outer ring structure 574, the length of the outer ring structure 574 is longer than that of the inner ring structure 578, and a plurality of connecting ribs 575 which are arranged at intervals are fixedly connected between the outer ring structure 574 and the inner ring structure 578; the valve core comprises a valve core column, one end of the valve core column is provided with an elastic baffle 571, the valve core column is arranged in the inner ring structure 578 and matched with the inner ring structure 578, the inner side surface of the baffle 571 is attached to the end surface of the outer ring structure 574, and the outer diameter of the baffle 571 is larger than the inner diameter of the outer ring structure 574 and smaller than the outer diameter of the outer ring structure 574.
The baffle 571 is vertically arranged, and the baffle 571 may be circular in shape or other shapes.
The valve core column comprises a first valve core part 576, a second valve core part 572 and a third valve core part 570 which are sequentially arranged, the outer diameter of the second valve core part 572 is larger than that of the first valve core part 576 and the third valve core part 570, the assembly is convenient, the second valve core part 572 is in interference fit with the inner ring structure 578, the firmness of the valve core column and the valve seat are improved, the second valve core part 572 is longer than the inner ring structure 578, the length difference between the second valve core part 572 and the inner ring structure is recorded as L, the range of L is 0.3 mm-0.5 mm, and the observation is convenient, and the valve core column is ensured to be installed in place; one end of the outer ring structure 574 is aligned with one end of the inner ring structure 578, and the inner side surface of the baffle 571 is in contact with the end surface of the inner ring structure 578, so that the baffle plate is convenient to mount in place; a conical limiting block 577 is arranged between the first valve core part 576 and the second valve core part 572, the limiting block 577 plays a limiting role, the valve core column is prevented from being leaved out, one end, close to the retaining sheet 571, of the limiting block 577 is larger than one end, away from the retaining sheet 571, of the limiting block, and the installation is convenient; the periphery of the valve seat is provided with a plurality of protruding rings 573 which are arranged at intervals, the number of the protruding rings 573 is preferably two, the protruding rings 573 are in interference fit with the second through holes, the check valve 57 is firmly fixed in the second through holes, the limiting rings 560 are arranged in the second through holes, and the limiting rings 560 are in contact with the protruding rings 573 which are close to the retaining sheets 571, so that the limiting effect is achieved.
The first valve core 576, the stopper 577, the second valve core 572, the third valve core 570 and the retaining sheet 571 are integrally formed, and are made of silica gel, so that the valve core column can be conveniently assembled in the valve seat, and other rubber materials can be adopted.
The length of the first valve core 576 is greater than the length of the inner ring structure 578, facilitating insertion of the first valve core 576 into the inner ring structure and then pulling outward to achieve an interference fit of the second valve core 572 with the inner ring structure 578.
When the air supply device 3 works, the air after primary filtration enters the second through hole through the breathing tube 2, then enters the interval between the outer ring structure 574 and the inner ring structure 578, pushes the baffle 571, and the baffle 571 deforms outwards, so as to open the one-way valve 57, as shown in fig. 6, the arrow in fig. 6 points to the air flow direction, the air is subjected to secondary filtration through the secondary filter element 54, and then flows into the hood from the first through hole 514 of the upper cover 51; when the blower 3 is damaged or is not powered, the check valve 57 is closed, preventing air mixed with foreign substances, bacteria, viruses, etc. from entering the hood.
The upper cover 51 comprises an outer ring structure 510, a middle ring structure 511 and an inner core structure 512 which are sequentially arranged from outside to inside, the outer ring structure 510 and the middle ring structure 511 are annular, the inner core structure 512 is plate-shaped, preferably circular plate, and a plurality of connecting rods 513 are fixedly connected between the outer ring structure 510 and the middle ring structure 511 and between the middle ring structure 511 and the inner core structure 512; the outer ring structure 510 is fixedly connected with the lower cover 58, and when the outer ring structure 510 and the lower cover 58 are fastened together, an annular protruding part 52 is arranged on one side of the outer ring structure 510 close to the lower cover 58, and the annular protruding part 52 is arranged in a stepped groove of the lower cover 58 and is tightly contacted with the inner wall of the stepped groove in a propping manner, so that the outer ring structure 510 and the lower cover 58 are fastened together; a plurality of spacing protrusions 53 which are arranged at intervals are arranged on one side of the middle ring structure 511 close to the secondary filter element 54; the side of the inner core structure 512, which is close to the secondary filter element 54, is also provided with a limiting protrusion 53, and the limiting protrusion 53 plays a limiting role, so that the secondary filter element 54 is prevented from greatly moving.
The exhaust filtering device 6 comprises an exhaust hole arranged on the head cover body 1, and a filtering membrane is arranged at the exhaust hole and also adopts the composite filtering membrane structure; the tightening and fixing device 4 is an elastic band, so that the lower part of the head cover body 1 can be conveniently tightened.
The invention can carry out omnibearing protection on the head of medical staff without wearing a mask or goggles, thereby avoiding pressure sores and indentations on the face of the medical staff and increasing the comfort of the medical staff. When the helmet is worn, the helmet body 1 is covered on the head of a medical staff, then the belt is tightened, and the air supply device is generally provided with a fixing belt to fix the air supply device on the body of the medical staff. When in use, the air supply device 3 is started, the air supply device 3 firstly carries out primary filtration on the external air, then enters the secondary filter device 5 from the breathing tube 2, the one-way valve 57 is opened under the action of air pressure, the air is subjected to secondary filtration through the secondary filter element 54, and then flows into the hood from the first through hole 514 of the upper cover 51. When the human body exhausts outwards, the gas enters the external environment through the exhaust filtering device 6 of the cover body, so that the cross infection phenomenon is avoided.
Claims (5)
1. The utility model provides a micro positive pressure protection hood with secondary filtration function of breathing in, includes the hood body, and the front portion of hood body is equipped with the window, and the lower part of hood body is equipped with tightens up fixing device, and the hood body is equipped with air supply arrangement outward, is equipped with primary filter equipment in the air supply arrangement, its characterized in that: the hood body is internally provided with a secondary filtering device, a breathing pipe is arranged between the secondary filtering device and the air supply device, and the secondary filtering device is communicated with the air supply device through the breathing pipe; the hood body is also provided with an exhaust gas filtering device, and a secondary filtering device and a window are arranged on the same side of the hood body and below the window;
The secondary filter device comprises an upper cover and a lower cover, the upper cover is fixedly connected with the lower cover, and a secondary filter element is arranged between the upper cover and the lower cover; the upper cover is provided with a first through hole for the filtered air to pass through, and the lower cover is communicated with the breathing tube;
A convex column is arranged on one side of the lower cover, which is far away from the secondary filter element, a second through hole is arranged in the convex column, and the breathing tube is detachably and fixedly connected with the convex column;
The one-way valve comprises a valve seat and a valve core, the valve core is arranged on the valve seat, and the valve seat is arranged in the second through hole; the valve seat comprises an outer ring structure, an inner ring structure is arranged in the outer ring structure, and a plurality of connecting ribs which are arranged at intervals are fixedly connected between the outer ring structure and the inner ring structure; the valve core comprises a valve core column, one end of the valve core column is provided with an elastic baffle plate, the valve core column is arranged in the inner ring structure and matched with the inner ring structure, and the inner side surface of the baffle plate is attached to the end surface of the outer ring structure;
The valve core column comprises a first valve core part, a second valve core part and a third valve core part which are sequentially arranged, the outer diameter of the second valve core part is larger than that of the first valve core part and that of the third valve core part, the second valve core part is in interference fit with the inner ring structure, the second valve core part is longer than the inner ring structure, the difference between the length of the second valve core part and the length of the inner ring structure is recorded as L, and the range of L is 0.3 mm-0.5 mm; the inner side surface of the baffle plate is contacted with the end surface of the inner ring structure; a conical limiting block is arranged between the first valve core part and the second valve core part, and one end, close to the baffle, of the limiting block is larger than one end, deviating from the baffle, of the limiting block; the periphery of the valve seat is provided with a plurality of protruding rings which are arranged at intervals, the protruding rings are in interference fit with the second through holes, limiting rings are arranged in the second through holes, and the limiting rings are in contact with the protruding rings close to the baffle plates;
The upper cover comprises an outer ring structure, a middle ring structure and an inner core structure which are sequentially arranged from outside to inside, and a plurality of connecting rods are fixedly connected between the outer ring structure and the middle ring structure and between the middle ring structure and the inner core structure; the outer ring structure is fixedly connected with the lower cover; a plurality of spacing protrusions which are arranged at intervals are arranged on one side of the middle ring structure, which is close to the secondary filter element; and a limiting bulge is also arranged on one side of the inner core structure, which is close to the secondary filter element.
2. The micro-positive pressure protective hood with secondary filtration and inhalation function according to claim 1, wherein: one side of the lower cover, which is close to the secondary filter element, is provided with a stepped groove, and the secondary filter element is arranged on the step of the stepped groove.
3. The micro-positive pressure protective hood with secondary filtration and inhalation function according to claim 2, wherein: the bottom surface of one side of lower cover that is close to the second grade filter core is equipped with down the supporting rib, and the quantity of lower supporting rib is a plurality of and evenly sets up along the circumference of lower cover at intervals, and lower supporting rib and second grade filter core contact.
4. The micro-positive pressure protective hood with secondary filtration and inhalation function according to claim 1, wherein: and a one-way valve is arranged in the second through hole.
5. The micro-positive pressure protective hood with secondary filtration and inhalation function according to claim 1, wherein: the exhaust filtering device comprises an exhaust hole arranged on the head cover body, and a filtering membrane is arranged at the exhaust hole; the tightening and fixing device is an elastic belt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010091480.2A CN110960813B (en) | 2020-02-13 | 2020-02-13 | Micro-positive pressure protective hood with secondary filtering and air suction functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010091480.2A CN110960813B (en) | 2020-02-13 | 2020-02-13 | Micro-positive pressure protective hood with secondary filtering and air suction functions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110960813A CN110960813A (en) | 2020-04-07 |
| CN110960813B true CN110960813B (en) | 2024-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010091480.2A Active CN110960813B (en) | 2020-02-13 | 2020-02-13 | Micro-positive pressure protective hood with secondary filtering and air suction functions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110960813B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111729217A (en) * | 2020-07-09 | 2020-10-02 | 安徽钟南人防工程防护设备有限公司 | Electric blowing filtering type protective head cover |
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| CN110960813A (en) | 2020-04-07 |
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