TWM658741U - Replaceable filter element for respirator - Google Patents

Abstract

This invention discloses a replaceable filter element for a respirator, including a shell, a filter layer and a connector. The shell is provided with a hollow inner cavity, and at least two layers of filter layers are provided in the inner cavity. Each layer of filter layer is a folded wave-like structure formed by multiple bends. The filter layers are staggered with each other at an angle to form an inner support of the shell. The shell is provided with a through hole, and a connector for connecting to the respirator is installed at the through hole. The replaceable filter element of this utility model is strong and durable, not easy to collapse, has good ventilation effect, light structure, and is comfortable to wear.

Description

Replaceable filter elements for respirators

This invention belongs to the field of respirator technology, and more particularly to a replaceable filter element of a respirator.

Respirators, also known as breathing masks or breathing masks, are an important type of personal protective equipment. They are mainly used to prevent or reduce particulate pollutants such as dust, smoke, and mist in the air from entering the human respiratory organs, thereby protecting life safety. These particulates may come from a variety of scenarios such as industrial production, construction, agricultural activities, and medical environments. For example, in construction sites, mines, smelters and other places, since a large amount of dust and particulates will be generated during the production process, workers need to wear respirators to protect their respiratory health. For example, in agricultural activities, farmers may also be exposed to harmful particulates such as pesticides and fertilizers when working in the fields, so they also need to wear corresponding respirators.

The protective principle of the respirator mainly relies on the filter element in the middle. The filter element is built with meltblown cloth material. The meltblown cloth has the characteristic of being electrostatically charged and can absorb very small particles, thereby achieving a filtering effect. However, since the dust is adsorbed on the filter element and the filter element is electrostatically charged and cannot be washed, the filter element needs to be replaced regularly.

At present, most of the filter elements on the market are flat-laid filter elements. An existing patent discloses a respirator, in which a layer of thin filter cotton is arranged inside the filter element, and the two sides of the filter cotton are sequentially stacked from the inside to the outside with fluffy high-resilience filter cotton, non-woven protective layer, high-efficiency electrostatic melt-sprayed filter material, activated carbon fiber, and medium-efficiency filter cotton, and finally the outer surface is wrapped with spunbond non-woven fabric. However, since the upper and lower filter layers use a flat-laid filter material placement method, there are still problems of large air resistance and poor air permeability, and it is easy to have a problem of shortness of breath during use. It was also disclosed that a support frame was designed inside the filter to increase the overall rigidity, but this brought about problems such as increased cost and weight.

The applicant has proposed a new technology to solve the defects of the filter elements currently on the market.

The purpose of this invention is to provide a replaceable filter element for a respirator, wherein the replaceable filter element is strong and durable, not easy to collapse, has good air permeability, light structure, and is comfortable to wear.

To achieve the above purpose, the solution of the invention is: a replaceable filter element of a respirator, including a shell, a filter layer and a connector, the shell is provided with a hollow inner cavity, at least two layers of filter layers are provided in the inner cavity, each layer of the filter layer is a folded wavy structure formed by multiple bends, and the filter layers are staggered with each other at an angle to form an internal support of the shell; the shell is provided with a through hole, and a connector for connecting to the respirator is installed at the through hole.

As a further improvement, the shell is composed of a front shell and a rear shell, the front shell, the filter layer and the rear shell are sealed and fixed together, a hollow inner cavity is formed between the front shell and the rear shell, and a through hole for installing the joint is opened on the front shell or the rear shell.

As a further improvement, the front shell and the rear shell are both made of non-woven fabrics.

As a further improvement, the front shell and the rear shell are both made of, or one of them is made of, hot-melt-set needle-punched cotton, and the rigidity of the front shell and the rear shell or one of them is greater than the rigidity of the two filter layers.

As a further improvement, the filter layer is made of melt-blown cloth.

As a further improvement, the staggered angle between the filter layers is 1° to 90°.

As a further improvement, the joint is coaxially arranged with the housing.

As a further improvement, the housing is in a disc shape or a box shape.

After adopting the above solution, the benefits of this creation are:

When people choose filter elements, they require high dust-blocking efficiency to ensure that they can effectively block particulate pollutants in the air. Factors such as comfort, breathability, and adaptability of the filter elements should also be considered to ensure that the wearer can Be comfortable with the mask and be able to wear it for long periods of time without discomfort. Based on this, the filter element produced by this creation can meet the above requirements. First of all, this creation uses a folded wavy filter layer, which has good air permeability. Moreover, the filter layers are staggered with each other, and a smooth air flow channel is formed between the fold intervals. , will not block, have low air resistance and better air permeability; in addition, the multi-layer filter layer can effectively block particulate pollutants in the air , providing a good filtering effect; then, the overall structure of this creation is simple and light, and the staggered filter layers provide a certain rigidity, which will not make the hand feel soft. It can support the shell internally, increase the overall rigidity, and improve the feel of use without adding other The support body can form an internal space, the structure is simpler and lighter, and the cost is low; in addition, if the general personnel in this field want to To make the folded filter layer in this case, the filter material and the shaping material need to be glued together to make them have a certain degree of adhesion and plasticity so that they can be easily folded. However, in this case, not only will the glue block the pores of the filter material, resulting in increased breathing resistance, but also the filtering effect will be affected. Reduced, and there may be health issues with the glue ingredients, and the folded filter needs to be sprayed with hot melt glue To fix the folding distance, the lateral rigidity is too strong and it cannot bend, and it also limits the variable range of the folding distance. However, the production method of this creation is simple and efficient, and does not require additional points on the folded wave structure of the filter layer. The glue process saves costs and processes. The final filter element is comfortable, breathable and has good dust blocking effect, which meets people's needs for filter elements.

The following will be combined with the attached figures in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative labor are within the scope of protection of the present invention.

The present invention provides a replaceable filter element of a respirator, as shown in FIG1 , comprising a shell 1, a filter layer 2 and a connector 3. The shell 1 is provided with a hollow inner cavity 11, and at least two layers of filter layers 2 are provided in the inner cavity 11. The number of layers of the filter layers 2 in the inner cavity 11 can be two, three, or even more, as long as the adjacent layers are staggered. The present embodiment takes two layers as an example, namely a first filter layer 21 and a second filter layer 22.

Each filter layer 2 is a folded wave-like structure formed by multiple bends. The filter layers are staggered at an angle, and the staggered filter layers 2 form the inner support of the housing 1. In combination with FIG. 3, not only the fold distance of each folded wave-like structure can smoothly circulate air, avoiding the situation where the air flow is poor due to stacking at the same angle, but also the staggered filter layers 2 are relatively As for the method of flattening the filter layer, its rigidity is greatly increased, and the rigidity provided is sufficient for people to hold and install it for use. It is not easy to collapse and has a good hand feel. The shell 1 does not need other supports to provide rigidity. In addition, the above structure also reduces the overall weight. Wearing it on the respirator will not bring more burden to the face. The production cost is relatively low, which is an upgrade of all aspects of the performance of existing filter elements.

As shown in Fig. 1 and Fig. 2, in order to be connected with a respirator, the housing 1 is provided with a through hole 12, and a connector 3 for connecting with the respirator is installed at the through hole 12.

Specifically, the shell 1 is composed of a front shell 13 and a rear shell 14. The front shell 13, the filter layer 2 and the rear shell 14 are sealed and fixed together. A hollow inner cavity 11 is formed between the front shell 13 and the rear shell 14. A through hole 12 for installing the connector 3 is opened on the front shell 13 or the rear shell 14. In a preferred embodiment, the front shell 13 and the rear shell 14 are both made of non-woven fabrics. Since the staggered folded filter layer 2 has provided a certain rigidity, it is sufficient to use non-woven fabrics for the front shell 13 and the rear shell 14, which can also save costs. Of course, the shell 1 can also be improved in other embodiments. For example, the front shell 13 and the rear shell 14 are both made of or one of them is made of hot-melt-set needle-punched cotton. The rigidity of the front shell 13 and/or the rear shell 14 thus constructed is greater than the rigidity of the two layers of filter layers 2, thereby making the shell 1 more rigid and having a better feel.

The folded wave-like structure of the filter layer 2 of the invention can increase the filtering area of the inner cavity 11. According to pressure P = pressure F/area S, when F remains unchanged, increasing S can reduce the value of P. When the penetration resistance F remains unchanged, the folded part can increase the filtering area S through which air passes by multiples by controlling the fold number and fold height, and can reduce the value of pressure P, that is, reduce breathing resistance, and increase the ventilation effect of the self-respirator by multiples. The material of the filter layer 2 of the utility model is not limited, and can be made of melt-blown cloth, which is light in quality and has good filtering effect, and is a better choice.

The filter elements of this invention are all made of light-weight materials and have a simple and neat structure, so that the filter elements of this invention are light and easy to carry when worn together with the respirator.

In addition, this creation also includes the following adaptive designs:

1. The offset angle between the filter layers is 1° to 90°, with 90° being the best. Theoretically, as long as there is an offset, the filter layers can be prevented from overlapping, and the filter layers can form internal support if they do not overlap.

2. The position of the joint 3 on the housing 1 is not limited and can be eccentric or coaxial with the housing 1.

3. The shape of the shell 1 is not limited, and can be disc-shaped (the attached figure of this work shows a disc shape), box-shaped, or any other shape.

The invention also provides a method for manufacturing a replaceable filter element of a respirator, comprising the following steps:

S1 manufactures filter layer 2: the melt-blown cloth is modified by controlling the temperature to obtain a filter layer 2 with a soft texture, and a first filter layer 21 roll and a second filter layer 22 roll are prepared in a continuous roll; after the outer contour of the shell 1 and the predetermined fold height and fold number are determined, the first filter layer 21 roll and the second filter layer 22 roll are transported to a folding mechanism, and folded according to the predetermined fold height to form a folded wave shape;

S2: manufacturing the front shell 13 fixed with the joint 3 and the first filter layer 21: clarifying the outer contour shape of the filter element and manufacturing a roller with the same shape as the outer contour, preparing the front shell 13 roll and the first filter layer 21 roll in a continuous roll, firstly transferring the front shell 13 roll and the first filter layer 21 roll to the punching mechanism, and stacking the transferred first filter layer 21 on the front shell 13, and then the punching mechanism punches holes on the front shell 13 and the filter layer 2 together to form the through hole 12, and then welds the edge of the joint 3 and the edge of the through hole 12 to the first filter layer 2 and the front shell 13, and finally, the roller cuts down to obtain the front shell 13 fixed with the joint 3 and the first filter layer 2;

S3 Back shell 14 edge sealing: Prepare the back shell 14 roll and the second filter layer 22 roll in continuous rolls, first transfer the second filter layer 22 roll and cover it on the first filter layer 21 at an angle, then transfer the back shell 14 roll and cover it on the second filter layer 22, finally, use the roller to cut and weld the edge sealing, so that the front shell 13, the first filter layer 21, the second filter layer 22 and the back shell 14 edge sealing are fixed together, and the filter element is obtained after completion.

In the patent application, specification and the above-mentioned drawings of this invention, if the terms "including", "having" and their variations are used, they are intended to mean "including but not limited to".

In the patent application scope, specification and the above-mentioned drawings of this creation, unless otherwise clearly defined, directional words, such as the use of terms such as "front", "back", "inside", "outside", "upper", "lower", "first", "second", etc. to indicate directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present creation and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction or be constructed and operated in a specific direction, so it cannot be understood as limiting the specific protection scope of this creation.

The above is only a preferred embodiment of this creation and is not a limitation on the design of this case. Any equivalent changes made based on the design key of this case fall within the scope of protection of this case.

1: Shell 11: Inner cavity 12: Through hole 13: Front shell 14: Back shell 2: Filter layer 21: First filter layer 22: Second filter layer 3: Connector

[Figure 1] is a schematic diagram of the decomposed structure of the utility model; [Figure 2] is a schematic diagram of the overall structure of the utility model; [Figure 3] is a schematic diagram of the cross-sectional structure of two filter layers with different angles in the inner cavity of the utility model.

1: Shell

12:Through hole

13: Front shell

14: Hind shell

2: Filter layer

21: First filter layer

22: Second filter layer

Claims (8)

A replaceable filter element for a respirator, comprising a shell, a filter layer and a connector, wherein the shell is provided with a hollow inner cavity, wherein at least two filter layers are provided in the inner cavity, each filter layer being a folded wave-like structure formed by multiple bends, and the filter layers are staggered with each other at an angle to form an inner support of the shell; a through hole is provided in the shell, and a connector for connecting with the respirator is installed at the through hole. A replaceable filter element for a respirator as described in claim 1, wherein the shell is composed of a front shell and a rear shell, the front shell, the filter layer and the rear shell are sealed and fixed together on all sides, a hollow inner cavity is formed between the front shell and the rear shell, and a through hole for mounting the joint is opened on the front shell or the rear shell. A replaceable filter element for a respirator as described in claim 2, wherein the front shell and the rear shell are both non-woven fabrics. A replaceable filter element for a respirator as described in claim 2, wherein both the front shell and the rear shell or one of them is made of heat-melt-set needle-punched cotton, and the rigidity of the front shell and the rear shell or one of them is greater than the rigidity of the two filter layers. A replaceable filter element for a respirator as described in claim 1, wherein the filter layer is made of meltblown cloth. A replaceable filter element for a respirator as described in claim 1, wherein the offset angle between the filter layers is 1° to 90°. A replaceable filter element for a respirator as described in claim 1, wherein the connector is coaxially arranged with the housing. A replaceable filter element for a respirator as described in claim 1, wherein the shell is disc-shaped or box-shaped.

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