CN216169451U - Powered air-supply air-filtering respirator - Google Patents

Powered air-supply air-filtering respirator Download PDF

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CN216169451U
CN216169451U CN202122308499.0U CN202122308499U CN216169451U CN 216169451 U CN216169451 U CN 216169451U CN 202122308499 U CN202122308499 U CN 202122308499U CN 216169451 U CN216169451 U CN 216169451U
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air
filtering respirator
filtering
filter
powered
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Chinese (zh)
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周少敏
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Goldland Industrial Co ltd
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Goldland Industrial Co ltd
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Abstract

The utility model belongs to the technical field of power air supply air filtration breathing equipment, and particularly relates to a power air supply air filtration respirator, which comprises a filtering respirator body, a filter element, a fan, a speed regulation control switch, a mobile power supply and a control main board, wherein the filter element is arranged on the filtering respirator body; the filtering respirator body is provided with an air inlet and an air outlet, and the air inlet is communicated with the air outlet; the filter element covers the air inlet and filters harmful substances such as particles, dust, spray and the like entering the air inlet, and the filter element is provided with at least one filter layer; the fan is arranged in the filtering respirator body and is used for sucking air from the air inlet and sending the air out from the air outlet; the speed regulation control switch and the filtering respirator body are used for controlling the rotating speed of the fan; the mobile power supply is connected with the filtering respirator body and is used for providing power supply; the control main board is respectively electrically connected with the fan, the speed regulation control switch and the mobile power supply; the filter core is provided with a plurality of layers of filter layers, is applied to various complex construction environments, obviously improves the filtering effect and ensures the health of constructors.

Description

Powered air-supply air-filtering respirator
Technical Field
The utility model belongs to the technical field of power air supply air filtration breathing equipment, and particularly relates to a power air supply air filtration respirator.
Background
The filtering respirator is a self-supply open type power air supply filtering respirator, which is widely applied to the field of welding, such as pipeline welding, and is used for workers to safely and effectively work in various environments such as dense smoke, toxic gas, steam or oxygen deficiency.
The filter core structure in most existing respirators is simple, and in the face of various complex construction environments, the mode of filtering dust in air by using the simple filter core cannot meet the requirements of constructors, so that inconvenience is brought to the constructors, and even the health of the constructors is damaged.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a power air supply air filtering respirator, and aims to solve the technical problems that the filter core of the respirator in the prior art is too simple in structure, cannot well filter dust in air, and is harmful to the health of constructors.
In order to achieve the purpose, the power supply air filtering respirator provided by the embodiment of the utility model comprises a filtering respirator body, a filter element, a fan, a speed regulation control switch, a mobile power supply and a control main board; the filtering respirator body is provided with an air inlet and an air outlet, and the air inlet is communicated with the air outlet; the filter element covers the air inlet and is used for filtering dust and impurities entering the air inlet, and the filter element is provided with at least one filter layer; the fan is arranged in the filtering respirator body and is used for sucking air from the air inlet and sending the air out from the air outlet; the speed regulation control switch and the filtering respirator body are used for controlling the rotating speed of the fan; the mobile power supply is connected with the filtering respirator body and is used for providing power supply; the control mainboard is arranged in the filtering respirator body and is electrically connected with the fan, the speed regulation control switch and the mobile power supply respectively.
Optionally, the powered air-supplying filtering respirator further comprises a remote control mechanism; the remote control mechanism comprises a control auxiliary plate and a controller; the control auxiliary board is electrically connected with the control main board, and the controller is electrically connected with the control auxiliary board.
Optionally, the powered supply air filtering respirator further comprises an alarm mechanism for detecting and alerting if the filter cartridge is installed; the alarm mechanism comprises a photoelectric switch, a buzzer and a vibrator, and the photoelectric switch, the buzzer and the vibrator are all electrically connected with the control auxiliary board.
Optionally, the filtering respirator body comprises a shell and a cover buckled on the shell; the shell is provided with the air inlet and the air outlet, the cover body is provided with a plurality of ventilation grooves which are used for ventilation, and the ventilation grooves are communicated with the air inlet.
Optionally, a mounting groove for mounting the filter element is formed between the housing and the cover body; the filter element is arranged in the mounting groove.
Optionally, when the filter layer of the filter element is a layer, the filter layer is made of filter cotton;
when the filter layers of the filter core are two layers, one layer of the filter layer is made of filter cotton, and the other layer of the filter layer is made of activated carbon.
Optionally, offer on the casing and be used for the installation portable power source's installation cavity, portable power source with the inner wall joint of installation cavity, the both ends of installation cavity are equipped with respectively and are used for the chucking portable power source's first protruding limit and the protruding limit that extends of second, portable power source is last to correspond first protruding limit that extends with the protruding position department that extends the limit of second is equipped with first joint strip and second joint strip respectively, first protruding limit that extends with the protruding limit of second respectively with first joint strip with second joint strip joint adaptation.
Optionally, the powered forced air filtering respirator further comprises a spring mechanism for controlling the second clamping bar to extend and retract; the spring mechanism comprises a buckle and a spring, one end of the spring is elastically connected with the mobile power supply, the other end of the spring is elastically connected with one end of the buckle, and the other end of the buckle is provided with the second clamping strip.
Optionally, the powered-supply air-filtering respirator further comprises a gear display screen for displaying a gear of a wind speed; the gear display screen is electrically connected with the control main board.
Optionally, the powered supply air filtering respirator further comprises a strap for securing the housing; the shell is provided with a plurality of clamping grooves which are used for clamping the bridle, and the bridle is clamped with the clamping grooves.
One or more technical solutions in the powered-air-supply filtering respirator provided by the embodiment of the present invention have at least one of the following technical effects: before the powered air supply air filtering respirator is used, a corresponding filter core is selected according to the current use environment, the poorer the air quality of the use environment is, more filter layers are arranged on the selected filter core, after the corresponding filter core is selected, the filter core is installed in the filtering respirator body, a speed regulation control switch is pressed, a fan is turned on, the fan is a blower, the fan is started and sucks air at an air inlet, then the air is pumped to an air outlet and is conveyed to constructors, the constructors can control the speed regulation control switch, the speed regulation control switch controls the rotating speed of the fan through a control main board, the fan can control the air inlet speed and the air outlet speed to change the air supply speed to meet the requirements of the constructors, compared with the traditional single-layer filter core, the powered air supply air filtering respirator has a novel structure and can be provided with a plurality of filter layers, can be applied to various complicated construction environments, satisfies constructors 'needs to the filter effect obviously improves, has ensured constructors' health.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic diagram of a powered air-supplying filtering respirator according to an embodiment of the present invention.
FIG. 2 is another schematic diagram of a powered air-supplying filtering respirator according to an embodiment of the present invention.
FIG. 3 is a schematic partial block diagram of a powered air-breathing apparatus according to an embodiment of the present invention.
FIG. 4 is another partial schematic view of a powered air-supplying filtering respirator in accordance with an embodiment of the present invention.
FIG. 5 is a schematic structural view of a filter cartridge of a powered air-filtering respirator provided in an embodiment of the present invention.
FIG. 6 is another schematic diagram of a filter element of a powered air-breathing apparatus according to an embodiment of the present invention.
FIG. 7 is a schematic structural view of a filtering respirator body of a powered air-filtering respirator provided in accordance with an embodiment of the present invention.
FIG. 8 is another schematic structural view of a filtering respirator body for a powered air filtering respirator according to an embodiment of the present invention.
FIG. 9 is a cross-sectional view of a powered, forced-air, filtering respirator provided by an embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
10-filtering respirator body 11-shell 12-cover body
13-mounting groove 14-clamping groove 20-filter element
21-filter layer 30-fan 40-speed regulation control switch
50-mobile power supply 51-first clamping strip 52-second clamping strip
54-charging interface 60-control mainboard 70-remote control mechanism
71-control auxiliary board 72-controller 81-photoelectric switch
82-buzzer 83-vibrator 90-spring mechanism
91-fastener 92-spring 90 a-gear position display screen
90 b-belt 111-air inlet 112-air outlet
113-installation cavity 121-ventilation groove 1131-first convex extending edge
1132 — second flange.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the embodiments of the present invention, and should not be construed as limiting the utility model.
In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
In one embodiment of the present invention, as shown in fig. 1 to 9, a powered air-supplying filtering respirator 30 is provided, which includes a filtering respirator body 10, a filter element 20, a fan 30, a speed-regulating control switch 40, a mobile power supply 50 and a control main board 60; the filtering respirator body 10 is provided with an air inlet 111 and an air outlet 112, and the air inlet 111 is communicated with the air outlet 112; the filter element 20 covers the air inlet 111 and is used for filtering dust and impurities entering the air inlet 111, and the filter element 20 is provided with at least one filter layer 21; the blower 30 is disposed in the filtering respirator body 10 for drawing air in from the air inlet 111 and sending air out from the air outlet 112; the speed regulating control switch 40 and the filtering respirator body 10 are used for controlling the rotating speed of the fan 30; the mobile power source 50 is connected with the filtering respirator body 10 and is used for providing power; the control main board 60 is disposed in the filtering respirator body 10, and the control main board 60 is electrically connected to the fan 30, the speed regulation control switch 40 and the mobile power supply 50 respectively.
Specifically, before the powered air-supplying air filtering respirator 30 of the present invention is used, the corresponding filter element 20 is selected according to the current use environment, the worse the air quality of the use environment is, the more filter layers 21 should be arranged on the selected filter element 20, after the corresponding filter element 20 is selected, the filter element 20 is installed in the filtering respirator body 10, the speed-regulating control switch 40 is pressed, thereby turning on the fan 30, the fan 30 is a blower, at this time, the fan 30 is started and sucks air at the air inlet 111, then the air is pumped to the air outlet 112 and delivered to the constructor, the constructor can operate the speed-regulating control switch 40, the speed-regulating control switch 40 controls the rotation speed of the fan 30 by controlling the main board 60, then the fan 30 can control the air inlet speed and the air outlet speed, so as to change the air supply speed to meet the self-demand, compared with the traditional single-layer filter element 20, the filter element 20 in the device has a novel structure, can be provided with multiple filter layers 21, can be applied to various complex construction environments, meets the requirements of constructors, obviously improves the filtering effect, and ensures the health of the constructors.
In another embodiment of the present invention, as shown in FIGS. 1-4, the powered supply air filtering respirator 30 further includes a remote control mechanism 70; the remote control mechanism 70 includes a control auxiliary plate 71 and a controller 72; the control auxiliary board 71 is electrically connected to the control main board 60, and the controller 72 is electrically connected to the control auxiliary board 71. Specifically, control accessory plate 71 is installed in the inside of filtering respirator body 10, control accessory plate 71 and control mainboard 60 electric connection, signal intercommunication, can be through line connection or through the bluetooth connection between controller 72 and the control accessory plate 71, thereby realize remote control, this device is when using, constructor need hang filtering respirator body 10 at the back, it is very troublesome so to go to adjust the speed governing control switch 40 on filtering respirator body 10 at the in-process that uses this device, can carry out remote control through the controller 72 that sets up, controller 72 can place the place that the constructor is convenient for use, the trouble of adjustment speed governing control switch 40 has been avoided.
In another embodiment of the present invention, as shown in FIGS. 1-4, the powered air-filtering respirator 30 further includes an alarm mechanism for detecting and alerting if the filter cartridge 20 is installed; the alarm mechanism comprises a photoelectric switch 81, a buzzer 82 and a vibrator 83, and the photoelectric switch 81, the buzzer 82 and the vibrator 83 are all electrically connected with the control auxiliary board 71. Specifically, the photoelectric switch 81 is installed inside the filtering respirator body 10, the photoelectric switch 81 can detect whether the filter element 20 is neglected, if the filter element 20 is installed, the device normally operates, if the photoelectric switch 81 detects that the filter element 20 is not installed, the buzzer 82 can give out a sound alarm, and the vibrator 83 can vibrate the filtering respirator body 10, so as to remind a constructor to install the filter element 20.
In another embodiment of the present invention, as shown in FIGS. 1-4, 7, and 8, the electro-optical switch 81 is disposed within the filtering respirator body 10, and the ray direction of the electro-optical switch 81 is toward the bottom of the filter element 20. Specifically, the ray direction of the photoelectric switch 81 is toward the bottom of the filter 20, and then the photoelectric switch 81 can detect whether the filter 20 is installed; and it can be detected that the filter element 20 is not installed in place, although it is installed.
In another embodiment of the present invention, as shown in fig. 1 to 9, the filtering respirator body 10 includes a housing 11 and a cover 12 fastened to the housing 11; the housing 11 is provided with the air inlet 111 and the air outlet 112, the cover 12 is provided with a plurality of ventilation slots 121 for ventilation, and each ventilation slot 121 is communicated with the air inlet 111. Specifically, install filter element 20 on casing 11, then with lid 12 and casing 11 lock, it is not hard up to prevent to filter element 20, a plurality of ventilation grooves 121 have been seted up on lid 12, air intake 111 sets up the front end at casing 11, air outlet 112 sets up the top at casing 11, ventilation grooves 121, air intake 111 and air outlet 112 intercommunication, when fan 30 operation, contaminated air at first gets into a plurality of ventilation grooves 121, then get into filter element 20 through a plurality of ventilation grooves 121 and realize filtering, supply constructor is supplied with in the air outlet 112 after filterable air gets into air intake 111 and then discharges, thereby realize the filtering process of air.
In another embodiment of the present invention, as shown in fig. 1, 2 and 7, a mounting groove 13 for mounting the filter element 20 is formed between the housing 11 and the cover 12; the filter element 20 is arranged in the mounting groove 13. Specifically, a mounting groove 13 is formed between the housing 11 and the cover 12, and the shape of the mounting groove 13 matches the shape of the filter element 20, so as to facilitate stable installation of the filter element 20 and prevent the filter element 20 from loosening.
In another embodiment of the present invention, as shown in fig. 5 and 6, when the filtration layer 21 of the filter element 20 is a single layer, the filtration layer 21 is made of filter cotton;
when the filter layers 21 of the filter element 20 are two layers, one of the filter layers 21 is made of filter cotton, and the other filter layer 21 is made of activated carbon. Specifically, in the device, two different filter elements 20 can be installed, one filter element 20 is the filter element 20 with only one filter layer 21, and the filter element 20 with one filter layer 21 is made of filter cotton, so that the device can be used in a low-pollution environment; one is a filter element 20 with two filter layers 21, an active carbon layer is additionally arranged on the original basis, and the active carbon is matched with filter cotton to be used together, so that the filter element can be used in the environment with higher pollution, and the health of constructors is guaranteed.
In another embodiment of the present invention, as shown in fig. 5 and 6, when the two filter layers 21 of the filter element 20 are two layers, the two filter layers 21 are arranged in an upper-lower layered manner, the upper filter layer 21 is an activated carbon layer, and the lower filter layer 21 is a filter cotton layer. Specifically, in the device, the two filter layers 21 are arranged in an upper-lower layered mode, the two filter layers 21 are overlapped together, polluted air firstly enters the activated carbon layer and then enters the filter cotton layer, the polluted air is effectively filtered, and the filtering effect is improved.
In another embodiment of the present invention, as shown in fig. 1 to 4 and 7 to 9, an installation cavity 113 for installing the mobile power supply 50 is formed in the housing 11, the mobile power supply 50 is clamped with an inner wall of the installation cavity 113, a first protruding extension 1131 and a second protruding extension 1132 for clamping the mobile power supply 50 are respectively arranged at two ends of the installation cavity 113, a first clamping bar 51 and a second clamping bar 52 are respectively arranged at positions on the mobile power supply 50 corresponding to the first protruding extension 1131 and the second protruding extension 1132, and the first protruding extension 1131 and the second protruding extension 1132 are respectively in clamping fit with the first clamping bar 51 and the second clamping bar 52. Specifically, the length direction both ends of installation cavity 113 are equipped with a protruding limit 1131 that extends of first protruding and a protruding limit 1132 of second respectively, earlier go up first joint strip 51 card with portable power source 50 and go into first protruding limit 1131 that extends, then go up second joint strip 52 card with portable power source 50 and go into in the protruding limit 1132 of extending of second, can realize portable power source 50's fixed, when needing to dismantle the battery, pull down second joint strip 52, can take out portable power source 50.
In another embodiment of the present invention, as shown in FIGS. 1-4 and 7-9, the powered air-filtering respirator 30 further includes a spring mechanism 90 for controlling the expansion and contraction of the second strap 52; the spring mechanism 90 includes a buckle 91 and a spring 92, one end of the spring 92 is elastically connected to the mobile power supply 50, the other end of the spring 92 is elastically connected to one end of the buckle 91, and the other end of the buckle 91 is provided with the second clamping strip 52. Specifically, second joint strip 52 and buckle 91 are connected, and when needing to dismantle the battery, buckle 91 is moved in the knot, and the motion trail of buckle 91 keeps away from the one end of the protruding limit 1132 of second, and when buckle 91 was moved then, buckle 91 will drive second joint strip 52 and keep away from the protruding limit 1132 of second, and when up to second joint strip 52 and the protruding limit 1132 separation of extending of second, can take out portable power source 50.
In another embodiment of the present invention, a power display lamp for displaying power is disposed on the portable power source 50. Specifically, be equipped with the electric quantity display lamp on portable power source 50, constructor can observe portable power source 50's electric quantity through the electric quantity display lamp, supplements as required.
In another embodiment of the present invention, as shown in fig. 1, 2 and 4, a charging interface 54 for charging is provided on the portable power source 50. Specifically, the mobile power supply 50 is provided with a charging interface 54, and the mobile power supply 50 is charged through the charging interface 54, so that cyclic utilization can be realized.
In another embodiment of the present invention, as shown in fig. 1-4, the powered air-breathing apparatus 30 further comprises a gear display screen 90a for displaying the gear of the wind speed; the gear display screen 90a is electrically connected to the control main board 60. Specifically, the gear display screen 90a is installed on the top of the housing 11, and the constructor can observe the current wind speed through the gear display screen 90a and adjust the current wind speed as needed.
In another embodiment of the present invention, as shown in FIGS. 1-2, the powered air-filtering respirator 30 further includes a strap 90b for securing the housing 11; a plurality of clamping grooves 14 used for clamping the belt 90b are formed in the shell 11, and the belt 90b is clamped with the clamping grooves 14. Specifically, wear to be equipped with a band 90b on the casing 11, band 90b can tie up on the health, and the constructor of being convenient for carries this device, and two draw-in grooves 14 that set up on the casing 11 are passed to band 90b, are favorable to realizing like this that band 90 b's is fixed.
In another embodiment of the present invention, as shown in fig. 1-2, the controller 72 is disposed on the strap 90 b. Specifically, the controller 72 can be clamped on the belt 90b, so that the air speed can be adjusted by the constructor through the controller 72 at any time, and the operation is simple and convenient.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A powered supply air filtering respirator, characterized by: the method comprises the following steps:
the filtering respirator body is provided with an air inlet and an air outlet, and the air inlet is communicated with the air outlet;
the filter element covers the air inlet and is used for filtering dust and impurities entering the air inlet, and the filter element is provided with at least one filter layer;
the fan is arranged in the filtering respirator body and is used for drawing air in from the air inlet and sending the air out from the air outlet;
the speed regulation control switch and the filtering respirator body are used for controlling the rotating speed of the fan;
the mobile power supply is connected with the filtering respirator body and is used for providing power supply;
the control mainboard is arranged in the filtering respirator body and is electrically connected with the fan, the speed regulation control switch and the mobile power supply respectively.
2. The powered air-supplying air filtering respirator of claim 1, wherein: the powered air-supplying air filtering respirator also comprises a remote control mechanism; the remote control mechanism comprises a control auxiliary plate and a controller; the control auxiliary board is electrically connected with the control main board, and the controller is electrically connected with the control auxiliary board.
3. The powered air-supplying air filtering respirator of claim 2, wherein: the powered air supply air filtering respirator also comprises an alarm mechanism for detecting and reminding whether the filter element is installed or not; the alarm mechanism comprises a photoelectric switch, a buzzer and a vibrator, and the photoelectric switch, the buzzer and the vibrator are all electrically connected with the control auxiliary board.
4. The powered air-supplying air-filtering respirator of any of claims 1 to 3, wherein: the filtering respirator body comprises a shell and a cover body buckled on the shell; the shell is provided with the air inlet and the air outlet, the cover body is provided with a plurality of ventilation grooves which are used for ventilation, and the ventilation grooves are communicated with the air inlet.
5. The powered air-supplying air filtering respirator of claim 4, wherein: an installation groove for installing the filter element is formed between the shell and the cover body; the filter element is arranged in the mounting groove.
6. The powered air-supplying air-filtering respirator of any of claims 1 to 3, wherein: when the filter layer of the filter element is a layer, the filter layer is made of filter cotton;
when the filter layers of the filter core are two layers, one layer of the filter layer is made of filter cotton, and the other layer of the filter layer is made of activated carbon.
7. The powered air-supplying air filtering respirator of claim 4, wherein: offer on the casing and be used for the installation portable power source's installation cavity, portable power source with the inner wall joint of installation cavity, the both ends of installation cavity are equipped with respectively and are used for the chucking portable power source's first protruding limit and the protruding limit that extends of second, portable power source is last to correspond first protruding limit that extends with the protruding position department that extends the limit of second is equipped with first joint strip and second joint strip respectively, first protruding limit that extends with the protruding limit of second respectively with first joint strip with second joint strip joint adaptation.
8. The powered air-supplying air filtering respirator of claim 7, wherein: the powered air supply air filtering respirator also comprises a spring mechanism for controlling the second clamping strip to stretch; the spring mechanism comprises a buckle and a spring, one end of the spring is elastically connected with the mobile power supply, the other end of the spring is elastically connected with one end of the buckle, and the other end of the buckle is provided with the second clamping strip.
9. The powered air-supplying air-filtering respirator of any of claims 1 to 3, wherein: the power air supply air filtering respirator also comprises a gear display screen for displaying the gear of the wind speed; the gear display screen is electrically connected with the control main board.
10. The powered air-supplying air filtering respirator of claim 4, wherein: the powered supply air filtering respirator also includes a harness for securing the housing; the shell is provided with a plurality of clamping grooves which are used for clamping the bridle, and the bridle is clamped with the clamping grooves.
CN202122308499.0U 2021-09-23 2021-09-23 Powered air-supply air-filtering respirator Active CN216169451U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202122308499.0U CN216169451U (en) 2021-09-23 2021-09-23 Powered air-supply air-filtering respirator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202122308499.0U CN216169451U (en) 2021-09-23 2021-09-23 Powered air-supply air-filtering respirator

Publications (1)

Publication Number Publication Date
CN216169451U true CN216169451U (en) 2022-04-05

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CN202122308499.0U Active CN216169451U (en) 2021-09-23 2021-09-23 Powered air-supply air-filtering respirator

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