Patent Description:
In ventilation therapeutic devices, such as ventilators, the noise reduction box is a very important component for mounting a fan and reducing the noise of the fan, so that the fan can draw external breathable gas (e.g., air) and then transfer the external breathable gas to a humidifier of the ventilator or directly deliver the external breathable gas to the service side, such as a breathing mask. However, owing to the fact that the air usually contains pollutants such as dust, the inside of the noise reduction box will become dirty to a degree as the ventilator is used, resulting in a hygienic problem. The human body health may be endangered if the inside of the noise reduction box is dirty to a high degree. Therefore, it is necessary to detect the degree to which the inside of the noise reduction box is dirty, so that the noise reduction box can be cleaned and serviced timely.

However, at present, most people don't pay attention to that problem. Besides, even if they want to check the degree of dirtiness inside the noise reduction box, it is difficult to do so, because most of the noise reduction boxes used presently are enclosed ones and can't be disassembled and reassembled or are difficult to disassemble and reassemble, and it is highly likely that the performance of the device containing the noise reduction box is compromised after the noise reduction box is reassembled, since the noise reduction box involves many parts.

A medical respirator is described in <CIT>. The medical respirator comprises a housing, a ventilation unit and an airway that is located inside the housing. The housing is perforated with an air inlet and an air outlet. A replaceable filter device is arranged at the air inlet. The filter device filters a part of the suspended particles contained in the air that flows into the respirator. The respirator can comprise a particle detector arranged at the outside of the housing. The particle detector is used to detect the content of suspended particles in the air outside the respirator.

<CIT> shows a combined domestic air cleaner that cleans indoor air in a room and simultaneously provides the room with fresh outdoor air. The combined air cleaner comprises a housing, an air supply port and at least one filter module. The combined air cleaner is connected to a fresh air hole through a fresh air pipe and the fresh air hole is connected to outdoor fresh air. A fan is arranged in the housing of the combined air cleaner. The fan is arranged in a noise reduction device. A first filter module is arranged in front of the fan and a second filter module is arranged after the fan.

In view of the above problems, the object of the present disclosure is to provide a noise reduction box having an internal dirtiness detection function and a ventilation therapeutic device including the noise reduction box.

In order to attain the above object, in an aspect, the present disclosure provides a noise reduction box, which comprises a shell and a detection assembly, wherein the inside of the shell defines a cavity, the shell is provided with an air inlet and an air outlet that are in communication with the cavity; and the detection assembly is mounted on the shell and wherein the detection assembly is adapted to detect the degree to which the inside of the cavity is dirty, so that the noise reduction box can be cleaned and serviced timely, wherein the detection assembly comprises a dirt adsorption component and the dirt adsorption component is adapted to absorb the pollutants in the air in the cavity and to develop the color to different degrees according to the amount of the absorbed pollutants.

Optionally, the dirt adsorption component is a transparent wall, which is formed as a part of the shell.

Optionally, the detection assembly comprises a light source, which is arranged in the cavity to illuminate the transparent wall.

Optionally, the cavity is provided with a partition assembly therein, which divides the cavity into an air intake cavity, a fan mounting cavity and an air discharge cavity, wherein the air inlet is in communication with the air intake cavity, the air outlet is in communication with the air discharge cavity, the air intake cavity is in communication with the fan mounting cavity through a first through hole formed in the partition assembly, the fan mounting cavity is in communication with the air discharge cavity through a second through hole formed in the partition assembly, the light source is arranged in the air intake cavity, and the transparent wall is formed as a part of the shell for defining the air intake cavity.

Optionally, the dirt adsorption component is air-permeable cotton, which is at least partially arranged in the cavity and can be taken out from the cavity.

Optionally, the detection assembly comprises a mounting component for mounting the air-permeable cotton, the shell is provided with a mounting port in communication with the cavity, and the mounting component is removably mounted in the mounting port so that the air-permeable cotton is positioned in the cavity.

Optionally, the mounting component is a plate-shaped component partially inserted into the cavity through the mounting port, an annular groove is arranged on the mounting component around the periphery of the mounting component and divides the mounting component into an insertion portion and a mounting portion in an insertion direction, the air-permeable cotton is mounted on the mounting portion, and the detection assembly comprises a seal ring embedded in the annular groove and configured to be in seal-fit with the periphery of the mounting port when the mounting portion is inserted into the cavity.

Optionally, the cavity is provided with a partition assembly therein, which divides the cavity into an air intake cavity, a fan mounting cavity and an air discharge cavity, wherein the air inlet is in communication with the air intake cavity, the air outlet is in communication with the air discharge cavity, the air intake cavity is in communication with the fan mounting cavity through a first through hole formed in the partition assembly, the fan mounting cavity is in communication with the air discharge cavity through a second through hole formed in the partition assembly, and the mounting port is configured to be in communication with the air intake cavity.

Optionally, the air-permeable cotton is plate-shaped, wherein.

Optionally, the cavity is provided with a guide structure for guiding the insertion of the mounting portion and supporting the mounting portion therein.

Optionally, the shell comprises an upper shell and a lower shell, the noise reduction box comprises a sealing element sandwiched between the upper shell and the lower shell, and the detection assembly is mounted on the upper shell or the lower shell.

In another aspect, the present disclosure provides a ventilation therapeutic device, which comprises the noise reduction box described above.

A special detection assembly for detecting the degree to which the inside of the noise reduction box is dirty is mounted on the noise reduction box in the present disclosure, so that the degree to which the inside of the noise reduction box is dirty can be clearly observed by means of the detection assembly, without it being necessary to disassemble the noise reduction box, and same is simple to operate and convenient for checking.

Other features and advantages of the present disclosure will be further detailed in the following embodiments.

The accompanying drawings are provided herein to facilitate further understanding on the present disclosure and constitute a part of this document. They are used in conjunction with the following embodiments to explain the present disclosure, but are not intended to constitute any limitation to the present disclosure. In the figures:.

<NUM> - shell; <NUM> - air inlet; <NUM> - air outlet; <NUM> - mounting port; <NUM> - air intake cavity; <NUM> - guide structure; <NUM> - fan mounting cavity; <NUM> - air discharge cavity; <NUM> - first partition; <NUM> - first through hole; <NUM> - mounting base; <NUM> - second partition; <NUM> - second through hole; <NUM> - third partition; <NUM> - fourth partition; <NUM> - upper shell; <NUM> - lower shell; <NUM> - transparent wall; <NUM> - light source; <NUM> - air-permeable cotton; <NUM> - mounting component; <NUM> - annular groove; <NUM> - insertion portion; <NUM> - mounting portion; <NUM> - annular boss; <NUM> - mounting groove; <NUM> - seal ring; <NUM> - sealing element.

Hereunder some embodiments of the present disclosure will be detailed with reference to the accompanying drawings. It may be understood that the embodiments described herein are only provided to describe and explain the present disclosure, but are not intended to constitute any limitation to the present disclosure.

In the present disclosure, unless otherwise specified, the terms that denote the orientations are used as follows, for example: "top" and "bottom" usually refer to orientations in the state of mounting and use; "inside" and "outside" refer to inside and outside in relation to the profiles of the components.

In an aspect, the present disclosure provides a noise reduction box, which comprises a shell <NUM> and a detection assembly, wherein the inside of the shell <NUM> defines a cavity, the shell <NUM> is provided with an air inlet <NUM> and an air outlet <NUM> that are in communication with the cavity; and the detection assembly is mounted on the shell <NUM> to detect the degree to which the inside of the cavity is dirty.

A detection assembly is mounted, specifically for detecting the degree to which the inside of the noise reduction box is dirty, on the noise reduction box in the present disclosure, so that the degree to which the inside of the noise reduction box is dirty can be clearly observed by means of the detection assembly, without it being necessary to disassemble the noise reduction box, and same is simple to operate and convenient for checking.

The above-mentioned detection assembly may be implemented in various ways, as long as it can detect the degree to which the inside of the cavity is dirty and is convenient for the user to observe or learn about the degree to which the inside of the cavity is dirty.

According to an embodiment of the detection assembly in the present disclosure, the detection assembly comprises a dirt adsorption component. The above-mentioned dirt adsorption component may be understood as a component that can absorb the pollutants in the air in the cavity and develop the color to different degrees according to the amount of the absorbed pollutants. Specifically, as shown in <FIG>, the dirt adsorption component may be a transparent wall <NUM>, which is formed as a part of the shell <NUM>. By providing the transparent wall <NUM>, dirt will adhere to and accumulate on the transparent wall <NUM> as the noise reduction box is used, and the transparency of the transparent wall <NUM> will change accordingly. The higher the degree of the dirtiness is inside the cavity, the lower the transparency of the transparent wall <NUM> is. Therefore, the degree of dirtiness inside the noise reduction box may be judged according to the level of transparency of the transparent wall <NUM>, thus the degree of the dirtiness inside the noise reduction box can be identified easily without disassembling the noise reduction box, and it is convenient for the user to decide whether to clean and service the noise reduction box. Furthermore, the detection assembly may further comprise a light source <NUM>, which may be arranged in the cavity to illuminate the transparent wall <NUM>. By providing the light source <NUM>, the level of transparency of the transparent wall <NUM> can be clearly observed in all cases, so that the degree of dirtiness inside the cavity can be ascertained more accurately.

In addition, in view that a fan is usually accommodated in the cavity, preferably the cavity is divided into several regions to facilitate the mounting of the fan and the detection of the degree of dirtiness therein. Specifically, a partition assembly may be arranged inside the cavity to divide the cavity into an air intake cavity <NUM>, a fan mounting cavity <NUM> and an air discharge cavity <NUM>, wherein the air inlet <NUM> is in communication with the air intake cavity <NUM>, the air outlet <NUM> is in communication with the air discharge cavity <NUM>, the air intake cavity <NUM> is in communication with the fan mounting cavity <NUM> through a first through hole <NUM> formed in the partition assembly, and the fan mounting cavity <NUM> is in communication with the air discharge cavity <NUM> through a second through hole <NUM> formed in the partition assembly.

During use, external gas (e.g., air) enters into the air intake cavity <NUM> through the air inlet <NUM>, and then enters into the fan mounting cavity <NUM> through the first through hole <NUM>. The gas entering into the fan mounting cavity <NUM> enters into the fan, then enters into the air discharge cavity <NUM> through the outlet of the fan and the second through hole <NUM>, and finally is discharged through the air outlet <NUM>.

From the above description, it can be seen that the air intake cavity <NUM> may be the cavity that can best represent the degree of dirtiness in the cavity. Therefore, in order to ensure the accuracy of the detection of the degree of dirtiness, a light source <NUM> may be arranged in the air intake cavity <NUM>, and the transparent wall <NUM> is formed as a part of the shell <NUM> for defining the air intake cavity <NUM>. It can be noted that the air intake cavity <NUM> may be defined by the transparent wall <NUM> in entirety or in part. In addition, the transparent wall <NUM> may be arranged on the shell <NUM> in any way, but it is advantageous to ensure that there is no clearance between the transparent wall <NUM> and the shell <NUM>, so as to avoid the loss of the gas in the cavity through the clearance.

The above-mentioned air intake cavity <NUM>, fan mounting cavity <NUM> and air discharge cavity <NUM> may be arranged appropriately in any way. According to an embodiment of the present disclosure, as shown in <FIG>, the air inlet <NUM> and the air outlet <NUM> are respectively located in the opposite side walls of the shell <NUM>, and the partition assembly divides the cavity into an air intake cavity <NUM>, a fan mounting cavity <NUM> and an air discharge cavity <NUM> sequentially in a direction from the air inlet <NUM> to the air outlet <NUM>.

The above-mentioned partition assembly may have any suitable composition and structure. According to an embodiment of the partition assembly in the present disclosure, as shown in <FIG>, the partition assembly may comprise a first partition <NUM> and a second partition <NUM> that are spaced apart from each other, wherein the first partition <NUM> is located between the air intake cavity <NUM> and the fan mounting cavity <NUM>; the first through hole <NUM> is arranged in the first partition <NUM>; the second partition <NUM> is located between the fan mounting cavity <NUM> and the air discharge cavity <NUM>; and the second through hole <NUM> is arranged in the second partition <NUM>. It can be understood that the air intake cavity <NUM> and the fan mounting cavity <NUM> are separated by the first partition <NUM>, and the fan mounting cavity <NUM> and the air discharge cavity <NUM> are separated by the second partition <NUM>. The shape and arrangement of the first partition <NUM> and the second partition <NUM> may be designed according to the actual requirements of the cavities (i.e., the air intake cavity <NUM>, the fan mounting cavity <NUM> and the air discharge cavity <NUM>). Of course, the design of the internal space of the cavity is not limited to the above-mentioned design; instead, the internal space of the cavity may be designed differently according to the actual requirements.

In the above embodiment, in order to improve the convenience and clarity of observation of the transparent wall <NUM>, as shown in <FIG> and <FIG>, the transparent wall <NUM> may be located on a side wall of the shell <NUM> opposite to the first partition <NUM>, and the light source <NUM> may be mounted on the first partition <NUM>.

The light source <NUM> may be mounted on the first partition <NUM> in any appropriate way. For example, a mounting base <NUM> for mounting the light source <NUM> may be provided on the first partition <NUM>. Specifically, as shown in <FIG> and <FIG>, the light source <NUM> may be a columnar lamp bead, and the mounting base <NUM> may be an annular structure extending from the first partition <NUM> toward the side where the transparent wall <NUM> is located, and the light source <NUM> is embedded in the annular structure. Of course, the light source <NUM> may be further connected to the mounting base <NUM> by bonding, etc., so as to improve the firmness and reliability of the mounting of the light source <NUM>.

In the present disclosure, the dirt adsorption component may be air-permeable cotton <NUM>, which is at least partially arranged in the cavity and can be taken out from the cavity. In order to facilitate color development, the air-permeable cotton <NUM> is preferably in a light color, such as white, cream, light pink, etc. In addition, in order to accurately reflect the degree of dirtiness of the light-colored air-permeable cotton, a gradient color bar chart may be worked out according to the degree of dirtiness. During use, the mounting component <NUM> may be taken out from the mounting port <NUM> at any time to observe the color of the light-colored air-permeable cotton <NUM> and compare it with the gradient color bar chart to identify the degree of dirtiness, thereby the degree of dirtiness inside the noise reduction box can be judged, so that the user can decide conveniently whether to clean and service the noise reduction box.

Furthermore, in order to facilitate the mounting of the air-permeable cotton <NUM>, the detection assembly may further comprise a mounting component <NUM> for mounting the air-permeable cotton <NUM>. That is to say, the air-permeable cotton <NUM> may be mounted on the mounting component <NUM> and then mounted on the shell <NUM> via the mounting component <NUM>. In order to enable the air-permeable cotton <NUM> to be positioned in the cavity and taken out from the cavity, the shell <NUM> may be provided with a mounting port <NUM> in communication with the cavity, and the mounting component <NUM> may be removably mounted in the mounting port <NUM>. When the mounting component <NUM> is mounted in the mounting port <NUM>, the air-permeable cotton <NUM> may be positioned in the cavity to detect the degree of dirtiness. To check the degree of dirtiness inside the cavity, the mounting component <NUM> may be removed from the mounting port <NUM> and the developed color of the air-permeable cotton <NUM> may be observed.

As for the specific structure of the mounting component <NUM> and the mounting method of the air-permeable cotton <NUM>, according to an embodiment of the present disclosure, the mounting component <NUM> may be a plate-shaped component partially inserted into the cavity through the mounting port <NUM> (see <FIG> and <FIG>), and an annular groove <NUM> is arranged on the mounting component <NUM> around the periphery of the mounting component <NUM> and divides the mounting component <NUM> into an insertion portion <NUM> and a mounting portion <NUM> in an insertion direction (i.e., the direction in which the mounting port <NUM> is arranged) (see <FIG> and <FIG>), the air-permeable cotton <NUM> is mounted on the mounting portion <NUM> (see <FIG> and <FIG>), and the detection assembly may further comprise a seal ring <NUM> embedded in the annular groove <NUM> and configured to be in seal-fit with the periphery of the mounting port <NUM> when the mounting portion <NUM> is inserted into the cavity (see <FIG>, <FIG>, <FIG> and <FIG>).

To enhance the reliability of the coupling between the seal ring <NUM> and a sealing element <NUM>, the seal ring <NUM> may be connected to the annular groove <NUM> by secondary encapsulation or bonding.

It can be understood that the mounting component <NUM> and the air-permeable cotton <NUM> mounted thereon may be inserted into the mounting port <NUM> and taken out from the mounting port <NUM> as an integral piece, wherein the insertion portion <NUM> of the mounting component <NUM> provides a force applying part for the user to insert the mounting component <NUM> into the mounting port <NUM> or extract the mounting component <NUM> from the mounting port <NUM> by holding the insertion portion <NUM> of the mounting component <NUM>; when the mounting component <NUM> is inserted into the mounting port <NUM>, the mounting portion <NUM> with the air-permeable cotton <NUM> enters into the cavity, while the insertion portion <NUM> is located outside the mounting port <NUM>, and the seal ring <NUM> between the mounting portion <NUM> and the insertion portion <NUM> is in seal-fit with the periphery of the mounting port <NUM>, so as to prevent the loss of the air in the cavity.

Specifically, the mounting component <NUM> may be formed as a square plate-shaped component, and the annular groove <NUM> divides the mounting component <NUM> into an insertion portion <NUM> and a mounting portion <NUM> in a lengthwise direction. The air-permeable cotton <NUM> may be plate-shaped.

Please see the embodiment shown in <FIG>. The mounting portion <NUM> may be arranged to be inserted into the cavity through the mounting port <NUM> in a direction perpendicular to the direction of the air flow through the cavity (i.e., the vertical direction shown in <FIG>, wherein the air flow direction is horizontal, i.e., a direction from the air inlet <NUM> to the air outlet <NUM>), and the mounting portion <NUM> is formed as an annular mounting frame, the air-permeable cotton <NUM> is embedded in the annular mounting frame, and the gas in the cavity can flow through the air-permeable cotton <NUM>. As shown in <FIG> and <FIG>, an annular boss <NUM> may be provided on an inner peripheral surface of the mounting frame, and the edges of the air-permeable cotton <NUM> may be bonded to the annular boss <NUM>. Alternatively, the air-permeable cotton <NUM> may be formed integrally with the mounting portion <NUM> by insert molding.

Please see the embodiment shown in <FIG>. The mounting portion <NUM> may be arranged to be inserted into the cavity through the mounting port <NUM> in a direction parallel to the direction of the air flow through the cavity (i.e., the horizontal direction shown in <FIG>), and the top surface of the mounting portion <NUM> is provided with a mounting groove <NUM> for embedding the air-permeable cotton <NUM>. As shown in <FIG> and <FIG>, in order to enhance the reliability of the mounting of the air-permeable cotton <NUM>, the air-permeable cotton <NUM> may be bonded to a bottom surface of the mounting groove <NUM>.

It can be noted that the air-permeable cotton <NUM> and the mounting portion <NUM> may be mounted and connected in different ways, not limited to the way described above. The air-permeable cotton <NUM> may be detachably connected with the mounting portion <NUM>, for example, by means of a snap-in structure, so that the air-permeable cotton <NUM> may be replaced conveniently.

In addition, to facilitate the insertion and extraction of the mounting component <NUM> while avoiding any sway of the mounting component <NUM> after it is inserted into the mounting port <NUM>, a guide structure <NUM> for guiding the insertion of the mounting portion <NUM> and supporting the mounting portion <NUM> may be arranged in the cavity.

For the embodiment shown in <FIG>, specifically, as shown in <FIG> and <FIG>, the guide structure <NUM> may be formed as a frame, and the inner peripheral surface of the frame may be provided with guide grooves that match the mounting portion <NUM> of the mounting component <NUM>. After the mounting portion <NUM> enters into the mounting port <NUM>, a top edge and a bottom edge of the mounting portion <NUM> enter into top guide groove and bottom guide groove of the frame and move further along the top guide groove and bottom guide groove. Finally, a right edge of the mounting portion <NUM> enters into a right guide groove of the frame and stops the movement; at that point, the seal ring <NUM> on the mounting portion <NUM> is right in seal-fit with the periphery of the mounting port <NUM>, and the mounting portion <NUM> entering into the cavity will not sway under a limiting effect of the guide grooves.

For the embodiment shown in <FIG>, specifically, as shown in <FIG>, the guide structure <NUM> may be formed as two guide rails that are parallel to each other, spaced apart from each other, and extend in the insertion direction of the mounting component <NUM>. After entering into the mounting port <NUM>, the mounting portion <NUM> of the mounting component <NUM> can move along the guide rails, and the spacing between the guide rails and the bottom wall of the shell <NUM> may match the thickness of the mounting portion <NUM>, so that the mounting portion <NUM> can be positioned between the guide rails and the shell <NUM> and thereby a limiting effect is achieved; in addition, a limiting structure for limiting the further movement of the mounting portion <NUM> may be arranged on the guide rails or on the bottom wall of the shell <NUM>, so as to limit the insertion position of the mounting portion <NUM> and ensure the seal-fit between the seal ring <NUM> and the mounting port <NUM>.

It can be noted that the structures of the air-permeable cotton <NUM> and the mounting portion <NUM>, the mounting method for the air-permeable cotton <NUM> and the mounting portion <NUM>, and the mounting method for the mounting portion <NUM> and the shell <NUM> in the present disclosure are not limited to those in the embodiments described above. Any structure and mounting method may be used as long as they can achieve the desired function. However, any such structure and mounting method shall be deemed as falling in the scope of protection of the present disclosure.

In addition, in the case that the cavity is divided by the partition assembly into an air intake cavity <NUM>, a fan mounting cavity <NUM> and an air discharge cavity <NUM>, the mounting port <NUM> may be configured to be in communication with the air intake cavity <NUM>.

In the present disclosure, it can be noted that the cavity may be divided by the partition assembly in any appropriate way. Of course, the inside of the cavity may be designed in other ways to realize the detection of the degree of dirtiness in the cavity and the communication between the cavities more reasonably and advantageously.

Specifically, for example, in the embodiment shown in <FIG>, the partition assembly comprises a first partition <NUM>, a second partition <NUM>, a third partition <NUM> and fourth partitions <NUM>, wherein the first partition <NUM> and the second partition <NUM> are spaced apart from each other and divide the cavity into an air intake cavity <NUM>, a fan mounting cavity <NUM> and an air discharge cavity <NUM> sequentially in the air flow direction; the first partition <NUM> is provided with a first through hole <NUM> for communication between the air intake cavity <NUM> and the fan mounting cavity <NUM>; the second partition <NUM> is provided with a second through hole <NUM> for communication between the fan mounting cavity <NUM> and the air discharge cavity <NUM>; the third partition <NUM> and the fourth partitions <NUM> are arranged in the air intake cavity <NUM>; the third partition <NUM> and the first partition <NUM> are spaced apart from each other; two fourth partitions <NUM> are connected in a spaced apart manner between the third partition <NUM> and the first partition <NUM> so as to divide the air intake cavity <NUM> into two small cavities that are spaced apart from each other in a left-right direction; and the first partition <NUM> is provided with two first through holes <NUM> that are in communication with the two small cavities respectively. In such a case, the mounting portion <NUM> of the mounting component <NUM> may be located at one of the first through holes <NUM>. During use, as shown in <FIG>, the gas entering into the air intake cavity <NUM> through the air inlet <NUM> may flow into the upper small cavity and the lower small cavity respectively, the gas flowing into the upper small cavity may directly enter into the fan mounting cavity <NUM> through the upper first through hole <NUM>, while the gas flowing into the lower small cavity may pass through the air-permeable cotton <NUM> and enter into the fan mounting cavity <NUM> through the lower first through hole <NUM>. By branching the gas entering into the air intake cavity <NUM>, a part of the gas may be introduced specially for the detection of the degree of dirtiness on a premise of ensuring gas circulation, so that the detection of the degree of dirtiness is more accurate and reliable.

In the present disclosure, the shell <NUM> may have any appropriate structure, and there is no restriction on the specific structure of the shell <NUM> in the present disclosure. For example, as shown in <FIG>, the shell <NUM> may comprise an upper shell <NUM> and a lower shell <NUM>, which may be fixedly connected, detachably connected or rotatably connected with each other. In addition, the noise reduction box may further comprise a sealing element <NUM> sandwiched between the upper shell <NUM> and the lower shell <NUM> to ensure the sealing between the upper shell <NUM> and the lower shell <NUM>. Depending the specific structure of the upper shell <NUM> and the low shell <NUM>, the detection assembly may be mounted on the upper shell <NUM> or the low shell <NUM>. In an embodiment of the shell <NUM> in the present disclosure, the cavity is mainly defined by the lower shell <NUM>; thus, the detection assembly may be mounted on the lower shell <NUM>.

The ventilation therapeutic device may be a ventilator, and a fan may be arranged in the noise reduction box.

While some preferred embodiments of the present disclosure are described above with reference to the accompanying drawings, the present disclosure is not limited to the details in those embodiments. Those skilled in the art can make various simple modifications and variations to the technical scheme of the present disclosure, without departing from the technical concept of the present disclosure. However, all these simple modifications and variations shall be deemed as falling in the scope of protection of the present disclosure.

In addition, it can be noted that the specific technical features described in the above embodiments may be combined in any appropriate form, provided that there is no conflict among them. To avoid unnecessary repetition, the possible combinations are not described specifically in the present disclosure.

Claim 1:
A noise reduction box, comprising a shell (<NUM>) and a detection assembly, wherein the inside of the shell (<NUM>) defines a cavity, the shell (<NUM>) is provided with an air inlet (<NUM>) and an air outlet (<NUM>) that are in communication with the cavity, and the detection assembly is mounted on the shell (<NUM>); characterized in that
the detection assembly is adapted to detect the degree to which the inside of the cavity is dirty, so that the noise reduction box can be cleaned and serviced timely, wherein the detection assembly comprises a dirt adsorption component and the dirt adsorption component is adapted to absorb the pollutants in the air in the cavity and to develop the color to different degrees according to the amount of the absorbed pollutants.