CN214286351U

CN214286351U - Adapter and respirator

Info

Publication number: CN214286351U
Application number: CN202022731912.XU
Authority: CN
Inventors: 魏坚
Original assignee: 3M China Ltd
Current assignee: 3M China Ltd
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-09-28
Anticipated expiration: 2030-11-23

Abstract

The utility model relates to an adapter and respirator. An adapter configured to mount a filter to an air intake mounting portion of a respirator, the adapter comprising: an end wall; a hollow first attachment portion configured to attach to and communicate with the air outlet of the filter; and a hollow second attachment portion, the first attachment portion and the second attachment portion communicating with each other through the through hole of the end wall, the second attachment portion being configured to be attached to and communicate with the intake air mounting portion. The respirator is provided with a gas filter box, the gas inlet installation part is a gas inlet of the gas filter box, and the first attachment part is eccentrically arranged relative to the second gas inlet installation part. According to the utility model discloses an adapter and respirator can use different filters and realize different barrier propterty as required, have improved filtration's commonality.

Description

Adapter and respirator

Technical Field

The utility model relates to a safety protection field, more specifically, the utility model relates to an adapter and have respirator of this adapter.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

The respirator is used as a safety protection device and is widely applied to providing safety protection for a wearer in various toxic and harmful environments and preventing toxic and harmful gases or toxic substances such as steam, dust, bacteria and the like from damaging the wearer. Respirators can be classified into active air-supply respirators and self-suction filter respirators according to the power source. The active air supply type respirator is mainly applied to high-concentration toxic air environments, special occasions such as high-altitude, underwater or closed cabins and the like. Self-priming filtering respirators are more common and are commonly used in general work environments. The self-suction filtering respirator uses the filtering structure to filter toxic and harmful substances in the inhaled air, so that a wearer can inhale clean air, effective safety protection is provided, and the self-suction filtering respirator is simple in structure and convenient to use.

As respirator-related code requirements increase, higher and higher requirements are placed on the protective performance of respirators. To provide effective protection, the filtration performance of the respirator needs to be improved. The filtration performance of the respirator depends to a large extent on the filter structure used. To improve the filtering performance of the respirator, one way is to improve the filtering efficiency of the filtering structure used by the respirator.

A combination type respirator is a typical self-priming filtering respirator, and the filtering structure employed generally includes a canister and a filter mounted on the exterior of the canister. The filter is mounted at the air inlet of the canister and is therefore often referred to as a pre-filter. Currently, common dust and poison combined type respirators are classified into a single-filter cartridge type respirator and a double-filter cartridge type respirator according to the number of filter cartridges used. The construction of different types of cartridges is generally different and, correspondingly, the construction of the filters mounted to the cartridges. For example, the construction of the cartridges used in single-cartridge respirators is generally different from the construction of the cartridges used in dual-cartridge respirators, and the construction of the filters mounted on the cartridges is correspondingly different. Due to the different structures of the poison filtering boxes, matched filters are generally adopted for the same type of poison filtering boxes. This limits the versatility of the canister and its installed filter, and the filter used in one type of canister cannot be directly transferred to another type of canister. In order to install filters of different filtration efficiencies on the same type of canister (e.g., installing filters of higher filtration efficiency), it is often necessary to design a dedicated filter for the canister, and not to be able to directly install filters used with other types of canisters, such as a filter mounted with a canister of a dual canister respirator, to a canister of a single canister respirator.

Accordingly, there is a need to improve the versatility of the filtering structure of a respirator to provide the desired filtering performance in accordance with the protective requirements of the environment with minimal modification to existing respirators.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to improve the commonality of the filtration of respirator, realize the switching of same filtration in the respirator of difference to under the minimum condition of change to the respirator, the protection according to the environment of locating requires to provide the respirator that has required filtering capability. Another object of the present invention is to ensure the versatility of the filter structure in different respirators while at the same time meeting the requirements of the respirator field of view.

An aspect of the present invention is to provide an adapter configured to mount a filter to an air inlet mounting portion of a respirator. The adapter includes: an end wall provided with a through hole; a hollow first attachment portion located on a first side of the end wall, the first attachment portion configured to attach to and communicate with the air outlet of the filter; and a hollow second attachment portion located on a second side of the end wall opposite to the first side, the first and second attachment portions communicating with each other through the through hole, the second attachment portion being configured to be attached to and communicate with the intake air mounting portion. The respirator is provided with a poison filtering box, and the air inlet installation part is an air inlet of the poison filtering box. The first attachment portion is eccentrically disposed with respect to the second attachment portion.

In one embodiment, the first attachment portion is a first annular wall extending around the through hole from the end wall toward the first side, the first annular wall being formed with a plurality of first projections circumferentially spaced apart from each other, the first projections extending radially outward from the first annular wall.

In one embodiment, the first protrusion is disposed spaced apart from a surface of the first side of the end wall.

In one embodiment, at least one of the plurality of first protrusions has a circumferentially extending dimension that is different from the circumferentially extending dimensions of the other first protrusions; and/or at least one of the first protrusions has a radially extending dimension that is different from the radially extending dimension of the other first protrusions.

In one embodiment, the adapter further comprises an outer annular wall surrounding the first annular wall, the outer annular wall being located radially outside the first annular wall, an annular accommodation space being formed between the outer annular wall and the first annular wall, the accommodation space being configured to accommodate a peripheral wall of the air outlet of the filter.

The second attachment portion is a second annular wall extending from an outer edge of the end wall toward the second side, the second annular wall being snap-fit connected with the air intake mounting portion.

In one embodiment, the inner surface of the second annular wall is circumferentially formed with a second protrusion projecting inwardly, the second protrusion snapping to a flange on the outer surface of the air intake mounting portion.

In one embodiment, the second protrusion extends as an annular protrusion on an inner surface of the second annular wall.

In one embodiment, the second protrusion is a plurality of arc-shaped protrusions spaced apart from each other in a circumferential direction of the second annular wall.

In one embodiment, the second annular wall is formed with a plurality of overhangs spaced apart from each other in a circumferential direction, and the second protrusion is formed on an inner surface of the overhang.

In one embodiment, the first attachment portion is disposed concentrically with the through hole and the second attachment portion is disposed eccentrically from the through hole.

In one embodiment, the through-hole is eccentrically arranged in the end wall. Preferably, the through hole is tangential to an edge of the end wall.

The end wall is circular or trapezoidal.

Another aspect of the present invention is to provide a respirator. The respirator includes a mask body, a canister adapted to be mounted to an air inlet of the mask body, and a first filter. The respirator also includes a second filter and an adapter according to the present invention. The air inlet of the poison cartridge can be selectively provided with a first filter or a second filter via an adapter.

In one embodiment, the air outlet of the second filter includes an annular flange formed with a central opening, and the annular flange is formed with a plurality of recesses circumferentially spaced from one another. The first attachment portion is inserted into the opening of the annular flange and is held by the annular flange after being rotated relative to the air outlet port of the second filter.

In one embodiment, a first seal is mounted between the adapter and the air outlet of the second filter; and a second sealing element is arranged between the toxin filtering box and the adapter.

The second filter is disc-shaped or trapezoid-shaped.

The poison filtering box is arranged at the front part of the mask body; or the poison filter box is arranged on the side part of the mask body.

The respirator is fitted with one or two canister cartridges.

In one embodiment, the first filter has a different filtration efficiency than the second filter.

The utility model discloses a setting has the adapter of first attachement portion and second attachement portion for the respirator can use different filters as required, realizes different barrier propterty, has improved the filtration structure's of respirator commonality, makes and to install different filters on the installation department of admitting air of same type under the minimum condition of installation department change of admitting air.

Drawings

Embodiments of the invention will be described below, by way of example only, with reference to the accompanying drawings. In the drawings, like features or components are designated with like reference numerals, and the drawings are not necessarily drawn to scale, and wherein:

FIG. 1 shows a perspective view of a respirator;

FIG. 2 shows a rear view of the respirator of FIG. 1;

FIG. 3 shows a plan view of a primary filter that may be mounted to the respirator shown in FIG. 1;

FIG. 4 shows a perspective view of the filter cotton cover of the first filter of FIG. 3;

FIG. 5 shows a perspective view of a second filter;

FIG. 6 shows a side view of the second filter of FIG. 5;

FIG. 7 shows a rear plan view of the second filter of FIG. 5;

FIG. 8 shows a cross-sectional view taken along section line A-A in FIG. 7;

figures 9 and 10 show respectively a perspective view of an adapter according to a first embodiment of the present invention;

FIG. 11 shows a rear plan view of the adapter of FIGS. 9 and 10;

FIG. 12 shows a front plan view of the adapter of FIGS. 9 and 10;

figures 13 and 14 show side views of the adaptor of figures 9 and 10 from different angles;

FIG. 15 shows a cross-sectional view taken along section line B-B in FIG. 11;

FIG. 16 shows a partial cross-sectional view taken along section line C-C in FIG. 12;

figure 17 shows a perspective view of a respirator according to a first embodiment of the present invention;

FIG. 18 shows an exploded view of the respirator of FIG. 17;

FIG. 19 shows a side view of the respirator of FIG. 17;

FIG. 20 shows a top view of the respirator of FIG. 17; and

fig. 21 shows a partial sectional view taken along section line D-D in fig. 20.

Detailed Description

The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, like reference numerals indicate like or similar parts and features. The drawings are only schematic representations of the concepts and principles of the embodiments of the present invention, and do not necessarily show the specific dimensions and proportions of the various embodiments of the present invention. Certain features that are in certain figures may be shown exaggerated in detail in order to illustrate relevant details or structures of embodiments of the invention.

In the description of the various embodiments of the present invention, the directional terms used in connection with "up," "down," "left," "right," "front," "back" and the like are used in the up, down, left, right, front, and back orientations of the wearer.

Fig. 1 and 2 show a respirator 100, wherein fig. 1 shows a perspective view of a main body portion of the respirator 100 and fig. 2 shows a rear view of the respirator 100.

Respirator 100 generally includes a mask body 10 and a filtering structure mounted to mask body 10. The mask body 10 is provided at left and right sides thereof with strap attaching portions 11 for attaching a strap (not shown). The mask body 10 is provided at its rear end with a flexible lip 13. When the respirator 100 is worn by a wearer, the lip 13 contacts and seals against the wearer's face so that at least the oronasal region of the wearer is covered by the mask body 10. As best shown in FIG. 2, the front end of the mask body 10 is provided with an air inlet 15 and an air outlet 17. Herein, the front-to-back direction coincides with the front-to-back direction of the wearer, and "rear end", "rear side" refers to the end, side, closer to the wearer when respirator 100 is worn to the wearer's face, while "front end", "front side" refers to the end, side, or side, farther from the wearer when respirator 100 is worn to the wearer's face. The air inlet 15 is used to mount a filter structure so that the wearer can inhale clean air filtered by the filter structure. The air inlet 15 and the filter structure may be mounted in a conventional manner, for example, by snap-fitting or screw-fitting. The air outlet 17 is designed to be a one-way valve, which allows the exhaled air of the wearer to be discharged through the air outlet 17, but does not allow the outside air to enter through the air outlet 17.

In the example shown in fig. 1 and 2, the filtering structure of the respirator 100 includes a canister 20. The rear end of the canister 20 is attached to the mask body 10. In this example, the canister 20 is cylindrical. The front end of the poison filtering box 20 forms an air inlet of the poison filtering box 20, and the rear end of the poison filtering box 20 is provided with an air outlet 23. The gas enters the canister 20 through an opening in the end face 21 at the front end of the canister 20, is filtered by the adsorbent material in the canister 20, and then leaves the canister 20 through the gas outlet 23. The air outlet 23 is attached to the air inlet 15 of the mask body 10 to attach the canister 20 to the mask body 10. In this example, the outlet port 23 of the canister 20 is snap-fit mounted to the inlet port 15 of the mask body 10. For example, a snap-fit portion is provided at the air outlet 23 of the canister 20, and a corresponding snap-fit portion (e.g., flange) is provided at the air inlet 15 of the mask body 10. The outlet port 23 of the canister 20 is snap-fitted directly to the inlet port 15 of the mask body 10. To facilitate positioning of the canister 20 relative to the mask body 10, the mask body 10 is provided with position markings 19 at the front end and position markings 25 at the rear end of the canister 20. In the illustrated example, the position mark portion 19 is a triangular projection formed at the front end of the mask cover body 10, and the position mark portion 25 is a triangular projection formed at the rear end of the canister 20, the apex of the triangular projection being directed to the rear side. When the air outlet 23 of the canister 20 is attached to the air inlet 15 of the mask shell 10, the position mark portion 25 of the canister 20 is aligned with the position mark portion 19 of the mask shell 10, so that the canister 20 is correctly positioned with respect to the mask shell 10 after being attached to the mask shell 10.

The canister 20 may be filled with a desired type of adsorbent material, such as activated carbon, depending on the environment of use, for protection against toxic and harmful gases, such as organic vapors, acid gases, etc. In addition, an additional filter can be installed on the poison filtering box 20 according to the requirement to filter out the particulate matters such as dust in the air. As shown in FIG. 1, the canister 20 is formed with an annular flange 29 at the front end. The annular flange 29 may be used for attaching the filter.

FIG. 3 illustrates a plan view of a primary filter 30 that may be used with the respirator 100 shown in FIG. 1. The first filter 30 includes a filter cotton 31 and a filter cotton cover 33. The filter cotton 31 is a filter element of the first filter 30, and is used for filtering out particulate matters such as dust. The filter cover 33 is used to fix the filter 31 to the canister 20 so as to cover the air inlet of the canister 20, that is, to cover the end face 21 of the canister 20. Fig. 4 shows a perspective view of the cotton filter cover 33. The cotton filter cover 33 includes an annular flange 331 having a central opening and a circumferential wall 333 extending from the annular flange 331 toward the rear side. The circumferential wall portion 333 is formed with a plurality of cutting slits 332 spaced apart from each other extending from the rear end toward the front side thereof to form a plurality of overhangs 335 spaced apart in the circumferential direction on the circumferential wall portion 333. Overhang 335 may deform radially relative to circumferential wall 333 when subjected to a force. Overhang 335 includes a protrusion 337 formed on the inner wall. In addition, the overhang 335 is formed with a radially outwardly extending lug 339 to facilitate gripping to apply force to the overhang 335. In the example shown in fig. 3 and 4, the circumferential wall 333 of the cotton filter cover 33 is formed with three overhangs 335. However, the cotton filter cover 33 may also be formed with more or less overhangs spaced apart from each other, e.g. 4 or 2 overhangs. The filter cotton 31 may be mounted to the canister 20 through a filter cotton cover 33. For example, the filter cotton 31 may be placed into the filter cotton cover 33 and then the filter cotton cover 33 is mounted to the air inlet of the canister 20 such that the protrusions 337 on the inner wall of the overhang 335 snap over the annular flange 29 of the canister 20, thereby sandwiching and securing the filter cotton 31 between the annular flange 29 of the canister 20 and the annular flange 331 of the filter cotton cover 33. Alternatively, the filter 31 may be placed directly on the front end of the canister 20 to cover the end face 21 of the canister 20 and then the filter cover 33 may be snapped onto the annular flange 29 of the canister 20.

By installing the canister 20 and the first filter 30, the respirator 100 can protect against both toxic and harmful gases and particulate matter such as dust. The protective properties of the respirator 100 can affect the breathing resistance to some extent. For filter structures with higher filter efficiency, the breathing resistance is typically higher. Accordingly, a respirator having an appropriate protective function can be selected as desired. In cases where the environment is heavily contaminated, respirators of higher protective capabilities are worn to provide the necessary protection. In the case of a low degree of environmental pollution, a respirator with low protection performance can be worn to reduce the breathing resistance. The protective performance of the respirator 100 depends on the filtration efficiency of the filter structure used, i.e., primarily on the filtration efficiency of the canister 20 and the first filter 30. The filtration efficiency of the canister 20 depends on the adsorbent material loaded in the canister 20. The adsorbent material loaded within the canister 20 is typically selected for a particular environment of use. The first filter 30 is mainly used for filtering out particulate matters such as dust, and different filtering efficiencies can be realized by selecting different types of filter cotton. One effective way to vary the protective performance of respirator 100 is to use filters of different filtration efficiencies as desired. For example, the protective performance of respirator 100 may be improved by using a filter that filters more efficiently.

Fig. 5 to 8 show the second filter 40. The mounting structure of the second filter 40 is different from that of the first filter 30. The filtering efficiency of the second filter 40 may be the same as or different from that of the first filter 30. For example, the filtering efficiency of the second filter 40 may be higher than that of the first filter 30. Fig. 5 shows a perspective view of the second filter 40, showing the rear side of the second filter 40. Fig. 6 shows a side view of the second filter 40, with the rear side of the second filter 40 facing downward. Fig. 7 shows a plan view of the second filter 40 as viewed from the rear end of the second filter 40. Fig. 8 shows a cross-sectional view taken along section line a-a shown in fig. 7.

The second filter 40 includes filter cotton 41 (shown in fig. 8), a mounting member 43, and a non-woven fabric 45. The non-woven fabric 45 is wrapped on the filter cloth 41, the inner peripheral edge of the non-woven fabric 45 is welded to the mounting member 43, and in addition, ultrasonic welding is also performed at the outer peripheral edge of the second filter 40 to form a sealing edge 47 for fixing and sealing the filter cloth 41, and both the front and rear sides of the filter cloth 41 are covered with the non-woven fabric 45. The filter cotton 41 can be used for filtering particulate matters such as dust, and can also filter certain toxic and harmful gases according to the type of the filter cotton 41. The filter cotton 41 can be synthetic fiber filter cotton, non-woven fabric filter cotton, glass fiber filter cotton or active carbon filter cotton. In the example shown in fig. 5 to 8, the filter cotton 41 has a disc shape. The mounting member 43 is provided at a central region of the filter cotton 41, forms an air outlet of the second filter 40, and serves to mount the second filter 40 to a corresponding air inlet mounting portion. As best shown in fig. 8, the mounting member 43 includes a cylindrical portion 431 and an annular portion 433 extending radially outward from the cylindrical portion 431. The cylindrical portion 431 forms an air outlet of the second filter 40. As shown in fig. 7, the rear end of the cylindrical portion 431 is provided with an annular flange 4311 extending radially inward from the cylindrical portion 433, and a plurality of recessed portions 4313 spaced apart from each other are formed in the annular flange 4311. As shown in fig. 5 and 7, a stopper portion 4315 is formed at one side of each concave portion 4313, and the stopper portion 4315 is recessed radially outward from the annular flange 4311 and extends in the axial direction. The stopper portion 4315 is configured to restrict the rotational direction of the attachment portion inserted into the recessed portion 4313 with respect to the cylindrical portion 431. In addition, as best shown in fig. 5, the annular flange 4311 is also provided with a projecting portion 4317 extending toward the side where the annular portion 433 is located, and as best shown in fig. 8, the projecting portion 4317 is provided with a sloped portion 4317A and a flat end face 4317B. The inclined surface portion 4317A is configured to guide rotation of the attachment portion inserted into the concave portion 4313 with respect to the cylindrical portion 431 so that the attachment portion is fitted with the end surface 4317B and held to each other. The ring portion 433 is welded in the filter cloth 41 to hold the mounting piece 43 in the central region of the filter cloth 41, with the cylindrical portion 431 protruding from the filter cloth 41 for mounting to a corresponding air inlet mounting portion, for example, to a socket, an air inlet of a canister, or an air inlet of a mask body.

When the filter is installed on the poison filtering box, the air inlet of the poison filtering box is sealed to be communicated with the air outlet of the filter, so that the air filtered by the filter can enter the poison filtering box, and the air not filtered by the filter cannot enter the poison filtering box, thereby realizing the dust and poison protection function of the respirator.

However, in the respirator 100 shown in fig. 1, the front end of the canister 20 where the air inlet is located is not provided with any mounting structure that can mate with the air outlet (i.e., the cylindrical portion 431) of the second filter 40 shown in fig. 5 to 8. The front end of the canister 20 is an air inlet of the canister 20, and the second filter 40 cannot seal the end face 21 of the front end of the canister 20, and therefore cannot seal the air inlet of the canister 20. Therefore, the second filter 40 shown in fig. 5 to 8 cannot be directly mounted to the canister 20.

Therefore, the utility model provides an adapter, this adapter can install second filter 40 to straining poison box 20 to realize the dirt poison safeguard function.

Fig. 9 to 16 show an adapter 50 according to a first embodiment of the present invention. Fig. 9 and 10 show perspective views of the adapter 50 from different angles, respectively. Fig. 11 and 12 show plan views of the adapter 50, respectively, viewed from different directions. Fig. 13 and 14 show side views of the adapter 50, respectively, from different directions. Fig. 15 shows a sectional view taken along section line B-B in fig. 11. Fig. 16 shows a partial sectional view taken along section line C-C in fig. 12.

The outer contour of the adapter 50 is substantially corresponding to the outer contour of the front end of the canister 20, and has a bottomed cylindrical shape. The adapter 50 comprises an end wall 51, the end wall 51 being provided with a circular through hole 511, a hollow first attachment portion being provided at a front side of the end wall 51, and a hollow second attachment portion being provided at a rear side of the end wall 51. The first attachment portion is configured to be attached to the air outlet of the second filter 40 and communicate with the air outlet of the second filter 40. The second attachment portion is configured to attach to and communicate with an air inlet mount of the respirator. In this example, the second attachment portion may be mounted to the air inlet port of the canister 20 (i.e., the front end of the canister 20), which is the air inlet mounting portion of the canister 20 (i.e., the front end of the canister 20, i.e., the end at which the annular flange 29 is located). The first and second attachment portions communicate with each other through the through hole 511 so that the gas filtered by the second filter 40 can flow through the through hole 511, the second attachment portion, and into the canister 20. In this example, the first attachment portion is a bayonet swivel attachment portion and the second attachment portion is a snap attachment portion.

The adapter 50 further includes a first annular wall 54 extending from the end wall 51 toward the front side (first side), an outer annular wall 52, and an annular protrusion 56, as shown in fig. 10. The first annular wall 54 extends around the through hole 511 of the end wall 51 toward the front side, and the front end thereof is provided with a plurality of first protrusions 541. To facilitate demolding when injection molding the adapter 50, a plurality of through holes 512 spaced apart from each other are provided at positions on the end wall 51 corresponding to the first protrusions 541, and to prevent shrinkage during injection molding, process holes 5411 are provided at the ends of the first protrusions 541. The plurality of first protrusions 541 are spaced apart from each other in the circumferential direction of the first annular wall 54, and protrude outward in the radial direction of the first annular wall 54. The first tab 541 extends only a portion of the axial length of the first annular wall 54 such that the end face 5412 of the first tab 541 is spaced from the end wall 51, thereby forming an annular space between the end face 5412 and the end wall 51, as shown in fig. 15 and 16. This space is intended to receive the annular flange 4311 of the second filter 40. The outer annular wall 52 surrounds the first annular wall 54 and is radially spaced from the first annular wall 54, forming an annular accommodation space between the outer annular wall 52 and the first annular wall 54 for accommodating a peripheral wall of the air outlet of the second filter 40 (i.e., the cylindrical portion 431) and a corresponding seal when the adapter 50 is assembled with the second filter 40. An annular projection 56 is formed between the outer annular wall 52 and the first annular wall 54 and is configured for resting the seal, upon assembly of the adaptor 50 with the second filter 40, in tight contact with the annular flange 4311 of the cylindrical portion 431 of the second filter 40 for a better seal. The first annular wall 54 may be fitted to the cylindrical portion 431 of the second filter 40, with the first projecting portion 541 of the first annular wall 54 passing through the recessed portion 4313 of the cylindrical portion 431 of the second filter 40 and cooperating with the annular flange 4311 of the cylindrical portion 431 of the second filter 40 after rotating relative to the cylindrical portion 431 to restrain the annular flange 4311 between the end face 5412 of the first projecting portion 541 and the end wall 51. The first annular wall 54 forms the aforementioned first attachment portion of the adapter 50.

The adapter 50 further includes a circumferential second annular wall 53 extending from the end wall 51 toward the rear side (second side). The second annular wall 53 extends from the outer edge of the end wall 51 toward the rear side, is disposed eccentrically to the through hole 511, and is therefore disposed eccentrically to the first annular wall 54. The inner wall of the second annular wall 53 is formed with a projection 533 extending in the circumferential direction. In the example shown in the drawings, the rear end portion of the second annular wall 53 is formed with a plurality of cut grooves 532 spaced apart from each other to form a plurality of overhangs 531 spaced apart in the circumferential direction on the second annular wall 53. The overhang 531 can deform radially with respect to the second annular wall 53 when subjected to a force. A projection 533 is formed on the inner surface of the overhang 531. In addition, the overhang 531 is formed with a radially outwardly extending lug 535 to facilitate gripping and applying force to the overhang 531. In the example shown in fig. 9 to 16, the second annular wall 53 of the adaptor 50 is formed with three overhangs 531. However, the adapter 50 may also be formed with more or fewer overhangs spaced apart from each other, e.g. 4 or 2 overhangs, or no overhangs are provided. In addition, in other examples according to the present invention, the protrusion 533 may be formed as an annular protrusion extending in the entire circumferential direction of the inner wall of the second annular wall 53.

Further, an annular protrusion 55 is formed radially inside the second annular wall 53, and the annular protrusion 55 protrudes from the end wall 51 toward the rear side. An annular groove 57 is formed between the annular protrusion 55 and the second annular wall 53, as shown in fig. 15. The groove 57 is used to accommodate a seal. The second annular wall 53 may be mounted to the front end of the canister 20 and the projection 533 may snap into the annular flange 29 of the canister 20. The second annular wall 53 forms the above-described second attachment portion of the adapter 50. To facilitate the correct positioning of the adapter 50 relative to the canister 20, the outer surface of the second annular wall 53 of the adapter 50 is provided with position markings 537, as shown in fig. 14.

The adapter 50 may be made of polypropylene (PP), Polycarbonate (PC), ABS resin, Polyamide (PA), or the like, may be formed as a single piece, and may be made by injection molding, for example.

As shown in FIG. 1, the canister 20 is mounted to the front end of the mask body 10 at the air inlet 15, at a laterally intermediate position, and the canister 20 is positioned directly in front of the nose and mouth region of the wearer when the respirator 100 is worn. If the second filter 40, which is mounted to the air inlet of the canister 20 using the adapter 50, is oversized, for example, the diameter of the second filter 40 is large such that it extends beyond the upper edge of the canister 20, the second filter 40 will block the wearer's view.

To this end, in the present example, the through hole 511 of the adapter 50 is eccentrically arranged with respect to the end wall 51, preferably, the through hole 511 is tangential to the edge of the end wall 51, the first annular wall 54 is concentric with the through hole 511, the second annular wall 53 is eccentric to the through hole 511, and the position marker 537 is arranged substantially aligned with the through hole 511 in the diametrical direction of the adapter 50 and on the farther side from the distant side, as shown in fig. 9, 11. With this arrangement, when the position index portion 537 of the adapter 50 is aligned with the position index portion 25 of the canister 20 to achieve positioning between the adapter 50 and the canister 20, since the through hole 511 is eccentric with respect to the center of the adapter 50, when the respirator assembled with the mask body 10, the canister 20, the adapter 50, and the second filter 40 is worn by the wearer, the through hole 511 is located below the center of the adapter 50, and the first annular wall 54 surrounding the through hole 511 is also offset downward with respect to the center of the adapter 50, so that the second filter 40 to which the adapter 50 is connected can be mounted in a lower position, avoiding the second filter 40 from obstructing the view of the wearer.

Accordingly, the respirator 200 of the present invention may include a mask body 10, a canister 20, a first filter 30, a second filter 40, and an adapter 50. The canister 20 may be mounted to the air inlet 15 of the mask body 10. And by providing the adapter 50, the respirator 200 can selectively mount either the first filter 30 or the second filter 40 as desired.

The respirator 200 has a similar construction to the respirator 100 shown in fig. 1 and 2, except that the filtering structure includes a canister 20, a first filter 30, and a second filter 40. Fig. 17 to 21 show the respirator 200 according to the present invention, and show a standby state in which the respirator 200 mounts the second filter 40 to the canister 20 using the adapter 50. In the drawings, the same or similar components are denoted by the same reference numerals, and description thereof is not repeated. Only the differences between respirator 200 and respirator 100 will be described below.

FIG. 17 shows a perspective view of the respirator 200, FIG. 18 shows an exploded view of the respirator 200 shown in FIG. 17, FIG. 19 shows a side view of the respirator 200 shown in FIG. 17, FIG. 20 shows a top view of the respirator 200 shown in FIG. 17, and FIG. 21 shows a partial cross-sectional view taken along section line D-D in FIG. 20, wherein the adsorbent material within the canister 20 is not shown in FIG. 21 in order to clearly illustrate the structural features of the various components. Respirator 200 includes a mask body 10 and a filtering structure mounted to mask body 10. In the ready-to-use state shown in fig. 17, the filtering structure of the respirator 200 includes the canister 20 and the second filter 40.

The second filter 40 is mounted to the air inlet of the canister 20 via an adapter 50. As best shown in fig. 18 and 21, the cylindrical portion 431 of the second filter 40 is mounted to the annular space between the outer annular wall 52 and the first annular wall 54 of the adapter 50, and the adapter 50 is mounted to the canister 20 with the projections 533 of the adapter 50 snapped over the annular flange 29 of the canister 20. In the example of the figure, an annular first seal S1 is mounted between the adaptor 50 and the air outlet of the second filter 40, and an annular second seal S2 is mounted between the adaptor 50 and the air inlet of the canister to achieve a good seal. However, it should be noted that the seal between the adapter 50 and the canister 20 and the second filter 40 may be achieved in other ways.

The main structure of the adapter 50 according to the first embodiment of the present invention and the respirator 200 using the adapter 50 are described above. The process of mounting the second filter 40 to the canister 20 using the adapter 50 will be described below with reference to the drawings.

First, the second filter 40 is mounted to the adapter 50. The first seal S1 is installed into the receiving space of the adaptor 50, the first seal S1 is nested on the first annular wall 54 and rests on the annular protrusion 56 such that the through holes 512 are all obscured by the first seal S1. Then, the cylindrical portion 431 of the second filter 40 is aligned with the outer annular wall 52 and the first annular wall 54 of the adapter 50 so that the recessed portion 4313 of the second filter 40 is aligned with the first projection 541 on the first annular wall 54 of the adapter 50, and the second filter 40 and the adapter 50 are pushed toward each other so that the first projection 541 of the adapter 50 enters the recessed portion 4313 of the second filter 40. Then, either one of the second filter 40 and the adapter 50 is rotated in one direction so that the annular flange 4311 of the cylindrical portion 431 of the second filter 40 is restrained between the end face 5412 of the first projection 541 of the adapter 50 and the first seal S1, thereby mounting the second filter 40 to the adapter 50.

Next, the adapter 50 with the second filter 40 mounted thereon is mounted to the canister 20. After the second seal S2 is mounted to the groove 57 of the adapter 50, the position index portion 537 of the adapter 50 is aligned with the position index portion 25 of the canister 20, and the second annular wall 53 of the adapter 50 is mounted to the front end of the canister 20 with the projection 533 being snapped to the annular flange 29 of the canister 20, thereby mounting the adapter 50 to the canister 20, completing the mounting between the adapter 50 and the canister 20, and thus completing the mounting of the second filter 40 to the canister 20. When the adapter 50 is mounted to the canister 20, the end wall 51 of the adapter 50 may cover the end face 21 (air inlet) of the canister 20, and the second sealing member S2 is disposed in the groove 57 of the adapter 50 and in close contact with the annular flange 29, providing an effective seal for the end face 21 of the canister 20, so that the canister 20 is in communication with only the air outlet of the second filter 40, and the air filtered by the second filter 40 can enter the canister 20, while the outside air cannot enter the canister 20.

As described above, when the wearer wears the respirator 200 assembled with the mask body 10, the canister 20, the adapter 50, and the second filter 40, the through hole 511 of the end wall 51 of the adapter 50 is located at a position below the center of the adapter 50, and the first attachment portion of the adapter 50 provided around the through hole 511 is thus also located at a position below the center of the adapter 50. Therefore, the second filter 40 attached to the canister 20 using the adapter 50 is offset downward with respect to the center of the adapter 50, as shown in fig. 19 and 21. This makes it possible to alleviate or even avoid the obstruction of the wearer's field of view by the second filter 40 even if the second filter 40 is installed in a large size, enabling the wearer to be assured of a better field of view.

The adapter 50 and the respirator 200 according to the first embodiment of the present invention have been described above. The filter structure of the respirator is a non-maintenance consumable accessory, and the canister and/or the filter need to be replaced according to the use condition and the use environment during the use process. For example, when the filter is contaminated seriously, the filter needs to be replaced with a new one. For example, filters having different filtration efficiencies may also be replaced as needed in the environment of use. Through according to the utility model discloses an adapter 50, respirator 200's poison filtering box 20 can use the filter of different grade type, has improved respirator 200's filtration's commonality for can install different filters on same type of poison filtering box as required, and need not to change the poison filtering box.

In the example shown above, the respirator is shown as a single canister type respirator, the canister 20 is mounted to the front of the mask body 10, the canister 20 has a cylindrical outer profile, and the second filter 40, which is mounted using the adapter 50, is in the form of a disk. However, the present invention is not limited thereto, and in other examples according to the present invention, the canister may be installed at a side portion of the mask body 10, the canister may have a three-dimensional trapezoidal outer contour, and the respirator may be a double canister type respirator.

In the example shown above, the second filter 40 has a disk shape, and the three first protrusions 541 of the adapter 50 are provided to have substantially the same size. However, the present invention is not limited thereto, and in other examples according to the present invention, the second filter 40 may also have a solid trapezoid shape, and a size of at least one first protrusion 541 of the plurality of first protrusions 541 of the adapter 50 extending in the circumferential direction and/or a size of the first protrusion 541 extending in the radial direction may be different from the other first protrusions 541. With this arrangement, positioning between the second filter 40 and the adapter 50 can be provided.

In the example shown above, the canister 20 is mounted to the air inlet port 15 of the mask body 10, and the second attachment portion of the adapter 50 is mounted to the air inlet port of the canister 20, which is the air inlet mounting portion of the canister 20. However, the present invention is not limited thereto. In other examples according to the invention, the respirator may also be provided with an add-on adapter of similar construction to adapter 50, the second attachment portion of which may be mounted directly to the air inlet 15 of the mask body 10, so that the respirator may also be used with only the second filter described above installed, without the canister.

Herein, exemplary embodiments of an adapter and a respirator according to the present invention have been described in detail, but it should be understood that the invention is not limited to the specific embodiments described and illustrated in detail above. Numerous modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the invention. All such variations and modifications are intended to fall within the scope of the present invention. Moreover, all the components described herein may be replaced by other technically equivalent components.

Claims

1. An adapter configured to mount a filter to an air intake mounting portion of a respirator, the adapter comprising:

an end wall provided with a through hole;

a hollow first attachment portion located on a first side of the end wall, the first attachment portion configured to attach to and communicate with the air outlet of the filter; and

a hollow second attachment portion located on a second side of the end wall opposite the first side, the first and second attachment portions communicating with each other through the through hole, the second attachment portion being configured to be attached to and communicate with the intake air mounting portion,

wherein the respirator is provided with a canister, the air inlet mounting part is an air inlet of the canister, and the first attachment part is eccentrically arranged relative to the second attachment part.

2. The adapter of claim 1,

the first attachment portion is a first annular wall extending around the through hole from the end wall toward the first side, the first annular wall being formed with a plurality of first protrusions circumferentially spaced apart from each other, the first protrusions extending radially outward from the first annular wall.

3. The adapter of claim 2 wherein said first protrusion is disposed spaced apart from a surface of said first side of said end wall.

4. The adapter of claim 2,

at least one of the plurality of first protrusions has a circumferentially extending dimension that is different from the circumferentially extending dimensions of the other first protrusions; and/or

At least one first protrusion of the plurality of first protrusions has a radially extending dimension that is different from a radially extending dimension of the other first protrusions.

5. The adapter according to claim 2, further comprising an outer annular wall surrounding the first annular wall, the outer annular wall being located radially outside the first annular wall, an annular accommodation space being formed between the outer annular wall and the first annular wall, the accommodation space being configured to accommodate a peripheral wall of the air outlet of the filter.

6. The adapter of claim 1 wherein the second attachment portion is a second annular wall extending from an outer edge of the end wall toward the second side, the second annular wall snap-connecting with the air intake mounting portion.

7. The adapter of claim 6 wherein the inner surface of the second annular wall is circumferentially formed with an inwardly projecting second projection that snaps to a flange on the outer surface of the air intake mounting portion.

8. The adapter of claim 7 wherein the second protrusion extends as an annular protrusion on an inner surface of the second annular wall.

9. The adapter of claim 7 wherein the second protrusion is a plurality of arcuate protrusions spaced from one another circumferentially of the second annular wall.

10. The adapter of claim 9 wherein the second annular wall is formed with a plurality of overhangs circumferentially spaced from one another, the second protrusions being formed on an inner surface of the overhangs.

11. The adapter as claimed in any one of claims 1 to 10 wherein the first attachment portion is disposed concentrically with the through bore and the second attachment portion is disposed eccentrically with the through bore.

12. The adapter of claim 11 wherein said through hole is eccentrically disposed on said end wall and said through hole is tangential to an edge of said end wall.

13. An adaptor according to any one of claims 1 to 10 wherein the end wall is circular or trapezoidal.

14. A respirator that includes a mask body, a canister adapted to be mounted to an air inlet of the mask body, a first filter,

characterised in that the respirator further comprises a second filter and an adapter according to any one of claims 1 to 13, the air inlet of the canister being selectively mountable to the first filter or to the second filter via the adapter.

15. The respirator of claim 14,

the air outlet of the second filter includes an annular flange formed with a central opening, and the annular flange is formed with a plurality of recesses circumferentially spaced from each other;

the first attachment portion is inserted into an opening of the annular flange and is held by the annular flange after being rotated relative to the air outlet port of the second filter.

16. The respirator of claim 14 or 15,

a first sealing element is arranged between the adapter and the air outlet of the second filter; and is

And a second sealing element is arranged between the toxin filtering box and the adapter.

17. A respirator according to claim 14 or 15, wherein the second filter is disc-shaped or trapezoidal.

18. The respirator of claim 14 or 15,

the poison filtering box is arranged at the front part of the mask body; or

The poison filtering box is arranged on the side part of the mask body.

19. The respirator of claim 14 or 15,

the respirator is provided with one or two toxin filtering boxes.

20. The respirator of claim 14 or 15,

the first filter has a filtration efficiency different from the second filter.