WO2023020376A1

WO2023020376A1 - Air purification device, purification assembly and humidification module thereof

Info

Publication number: WO2023020376A1
Application number: PCT/CN2022/112037
Authority: WO
Inventors: 刘彦安; 李瑞菲; 高亭
Original assignee: 科沃斯机器人股份有限公司
Priority date: 2021-08-20
Filing date: 2022-08-12
Publication date: 2023-02-23
Also published as: CN113739321A

Abstract

Disclosed are an air purification device, and a purification assembly and a humidification module thereof. A filter module (210) comprised by the purification assembly (20) surrounds the periphery of the humidification module (220). The humidification module (220) comprises a water tank (222), a humidification layer (2212), and a pump assembly (223), a flow channel (224) also being provided on the humidification module (220). The pump assembly (223) is used to extract the liquid from the water tank (222) into the flow channel (224) to wet the humidification layer (2212). Furthermore, excess liquid may flow back into the water tank (222) through the flow channel (224), thereby forming a water circulation system. After being purified by the filtering module (210), external air can be purified and humidified again by means of the wetted humidifying layer (2212), thereby having the beneficial effects of simultaneous purification and humidification, effectively increasing air quality.

Description

Air purification equipment, its purification component and humidification module

cross reference

This application claims the priority of the Chinese patent application submitted on August 20, 2021 with the application number "202110961525.1" and the title of the invention "air purification equipment, its purification components and humidification module", the entire contents of which are incorporated herein by reference Applying.

technical field

The present application relates to the field of air purification, in particular to an air purification device, its purification component and a humidification module.

Background technique

With the improvement of people's living standards, the requirements for the quality of life are getting higher and higher. However, with the rapid development of modern society, the pollution of the environment is becoming more and more serious. The indoor environment where people live is getting worse and worse. All kinds of air pollution Things such as PM2.5, dust, pollen, odor, decoration pollution such as formaldehyde, bacteria, allergens, etc. seriously pollute the air environment and affect people's health. Air purification equipment is used to absorb, decompose or transform various air pollutants, which can significantly improve air quality, so the application of air purification equipment is becoming more and more common. However, the existing air purification equipment has a single function, and the purification effect that can be played is limited.

Contents of the invention

Various aspects of the present application provide an air purification device, its purification component and humidification module, which can simultaneously achieve the purpose of air humidification and repurification, and solve the problem of limited air purification effect of existing equipment.

An embodiment of the present application provides an air purification device, including a host and a purification component. The purification assembly is detachably arranged on the host, and includes a filter module and a humidification module. The filter screen of the filter module surrounds the periphery of the humidification module, wherein the humidification module is provided with flow channels, and the The humidification module includes: a water tank, provided with a water outlet and a water inlet, respectively connected to the flow channel; a humidifier, including a humidification layer, the humidification layer corresponds to the filter screen, and is in contact with the flow channel; And a pump assembly, connected to the water tank, used to pump the liquid in the water tank to the water outlet, the liquid circulates in the flow channel through the water outlet, wets the humidification layer, and flows from the inlet Water flows back into the tank.

Optionally, the humidifier is arranged on the water tank, and the flow channel is arranged around the humidifier and the water tank.

Optionally, the flow channel is formed on the top of the water tank, and the water outlet and the water inlet are respectively formed on the flow channel on two opposite sides of the water tank.

Optionally, the water outlet protrudes from the surface of the flow channel, and the inner diameter of the water inlet tapers toward the direction of being concave on the surface of the flow channel.

Optionally, the flow channel includes a first flow channel and a second flow channel, the first flow channel is arranged around the humidifier and the water tank, and the second flow channel is arranged around the humidifier Above, there are a plurality of spray holes corresponding to the humidification layer, wherein the water outlet is connected to the surface of the second flow channel, the water inlet is connected to the surface of the first flow channel, and the liquid passes through The plurality of spray holes wet the wetting layer and flow back to the water inlet through the first channel.

Optionally, the flow channel is arranged obliquely along a side of the water outlet facing the water inlet.

Optionally, the water inlet is provided with a backflow stop valve.

Optionally, the humidification module further includes a bracket, the outer surface of the bracket is provided with a locking part, the bracket is arranged on the water tank, the humidification layer is arranged around the outer surface, and passes through the The locking part is fastened on the flow channel.

The embodiment of the present application further provides an air purification device, including a main unit and a detachable humidifying module arranged on the main unit. The humidification module includes: a water tank, a flow channel is provided on the top, and a water outlet and a water inlet are provided on opposite sides of the flow channel; a humidifier, including a humidifying layer, is arranged on the flow channel; and a pump assembly is connected to the The water tank is used to extract the liquid in the water tank to the water outlet, the liquid circulates in the flow channel through the water outlet, wets the humidification layer, and flows back from the inlet water to the water tank Inside.

Optionally, the humidification module further includes a bracket, the outer surface of the bracket is provided with a locking part, the humidification layer is arranged around the outer surface, and is fastened to the flow channel through the locking part .

The embodiment of the present application also provides a purification assembly, including a filter module and a humidification module, the filter of the filter module surrounds the periphery of the humidification module, and the humidification module includes: a water tank, a flow channel is arranged around the top, and A water outlet and a water inlet are arranged at intervals on the flow channel; a humidifier is arranged on the top of the water tank, and the humidifying layer of the humidifier corresponds to the filter screen and is in contact with the flow channel; and a pump assembly , connected to the water tank for pumping the liquid in the water tank to the water outlet, the liquid circulates in the flow channel through the water outlet, wets the humidification layer, and flows back from the inlet water to the inside the tank.

The embodiment of the present application also provides a humidification module, including: a water tank, provided with a water outlet and a water inlet, respectively connected to the flow channel; a humidifier, including a humidification layer, the humidification layer corresponds to the filter, and and the pump assembly, connected to the water tank, for pumping the liquid in the water tank to the water outlet, and the liquid circulates in the flow channel through the water outlet to wet the Humidification layer, and return water from the inlet to the tank.

Optionally, the humidifier is arranged on the water tank, the flow channel is arranged around the top of the water tank, and the water outlet and the water inlet are respectively formed on the two opposite sides of the water tank. on the runner.

Optionally, the flow channel includes a first flow channel and a second flow channel, the first flow channel is arranged around the top of the water tank, the second flow channel is arranged around the top of the humidifier, and there are A plurality of spray holes corresponding to the humidification layer, wherein the water outlet is connected to the surface of the second flow channel, the water inlet is connected to the surface of the first flow channel, and the liquid passes through the plurality of spray holes The shower hole wets the humidification layer and returns to the water inlet through the first flow channel.

In the embodiment of this application, through the water circulation system composed of the water tank, humidification layer and pump assembly of the humidification module, the liquid in the water tank can enter the flow channel to soak the humidification layer, and the excess liquid is recycled to the water tank to achieve energy efficiency. Recycling, and after the outside air is purified by the filter module, it can then pass through the infiltrated humidification layer for humidification and second-degree purification procedures to improve the purification efficiency and improve the quality of the filtered air.

Description of drawings

The drawings described here are used to provide a further understanding of the application and constitute a part of the application. The schematic embodiments and descriptions of the application are used to explain the application and do not constitute an improper limitation to the application. In the attached picture:

FIG. 1 is an exploded view of an air purification device according to an embodiment of the present application.

FIG. 2 is a cross-sectional view of a purification assembly according to an embodiment of the present application.

Fig. 3 is a cross-sectional view of the water tank of the embodiment of the present application.

Fig. 4 is a top view of the water tank of the embodiment of the present application.

Fig. 5 is a schematic diagram of the use state of the water tank of the embodiment of the present application.

FIG. 6 is a schematic diagram of the use state of the purification component of the embodiment of the present application.

Fig. 7 is a schematic view of the usage state of the purification assembly according to the embodiment of the present application under another viewing angle.

Fig. 8 is a cross-sectional view of a humidification module in another embodiment of the present application.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

It should also be noted that the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes Other elements not expressly listed, or elements inherent in the process, method, commodity, or apparatus are also included. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Please refer to Figure 1, the embodiment of the present application provides an air purification device 1, which can be a fixed air purification device, a portable air purification device, or can move along a pre-planned path according to the control instructions in the host Self-moving cleaning equipment, etc.

The air purification device 1 includes a host 10 and a purification component 20 . The host 10 includes a connected body 110 and a base 120 , and an installation space 130 is provided between the body 110 and the base 120 for accommodating the purification unit 20 . Wherein, the surface of the base 120 in the installation space 130 is provided with a conductive member, which can be a shrapnel, a contact piece, a terminal, a metal probe or other conductive structures suitable as a power contact, and is used to be installed on the purification assembly 20 Corresponding conductive sheets are butted together to provide power to drive the purification assembly 20 to operate. In addition, the host 10 is provided with a fan assembly on the side facing the base 120 in the installation space 130 to accelerate the air flow inside and outside the installation space 130 to form a preset air purification path. For example, when the air purification device is turned on, the motor of the fan assembly drives the fan to rotate, forming a pressure to compress the air, so that the air directly enters the installation space 130 . Moreover, on the air flow path, since the purification assembly 20 is located in front of the air inlet of the fan assembly, the pollutants contained in the external environment (such as fine particles, formaldehyde, volatile organic compounds (VOC), etc.) are pre-purified by the purification assembly 20 It is intercepted and converted into clean air after being filtered, and then discharged to the external environment through the air outlet.

Please refer to FIG. 1 and FIG. 2 , the purification assembly 20 is detachably combined in the installation space 130 . The purification assembly 20 includes a filter module 210 and a humidification module 220 . In other embodiments of the present application, the purification component 20 can additionally expand other functional modules (such as a disinfection module or an aromatherapy module, etc.) and increase or decrease functional modules according to usage requirements.

The filter module 210 includes a top plate 211 , a bottom plate 212 and a filter screen 213 . An assembly port is provided on the top plate 211 for the humidification module 220 to be arranged in the filter module 210. The filter screen 213 is disposed between the top board 211 and the bottom board 212 , and it may be arranged on the bottom board 212 in the form of a drum, and forms an accommodating space 214 around it. Wherein, the filter screen 213 may be a single-layer structure or a multi-layer structure, such as a multi-layer structure in which the inner and outer layers are a combination of a high-efficiency air filter (HEPA) and a fabric layer, but it is not limited thereto.

Please refer to FIG. 2 to FIG. 4, the humidification module 220 can be, but not limited to, detachably arranged in the accommodating space 214 of the filter module 210, so that the filter module 210 and the humidification module 220 are respectively located in the air from outside to inside. The upstream and downstream of the flow path allow the air to pass through the filter screen of the filter module first, then pass through the humidification module, and then be pumped to the external environment by the fan assembly. Wherein, the humidifying module 220 is in contact with the conductive member on the base 120 through the conductive sheet in the accommodating space 214 to conduct power supply. The humidification module 220 includes a humidifier 221 , a water tank 222 and a pump assembly 223 , and a channel 224 is provided between the humidifier 221 and the water tank 222 for the liquid in the water tank 222 to circulate.

The humidifier 221 includes a bracket 2211 and a humidification layer 2212 . The bracket 2211 is arranged on the water tank 222 , which may be a frame corresponding to the surrounding arrangement of the filter screen 213 . The humidifying layer 2212 is composed of moisture-retaining materials, such as a single-layer or multi-layer structure with holes formed by processing materials such as biological fibers (such as pulp), foaming materials, or resins. The humidifying layer 2212 is disposed on the outer surface of the bracket 2211 facing the filter screen 213 . Wherein, the humidifying layer 2212 may be, but not limited to, arranged around the outer surface of the bracket 2211 and has an annular structure corresponding to the filter screen, so as to obtain the largest area corresponding to the filter screen 213 and the largest area in contact with the air. Therefore, in the embodiment of the present application, the horizontal position of the filter screen in the purification assembly 20 can be, but not limited to, close to the humidifier 221, so that the height of the filter screen 213 and the humidifier 221 are approximately the same, which is beneficial to the overall volume reduction.

In addition, in some implementations of the present application, the top of the bracket 2211 is further provided with an engaging portion 2213 extending outward from the outer surface of the bracket 2211 to buckle the humidifying layer 2212 on the flow channel 224 to avoid slipping. Wherein, the flow channel 224 can be correspondingly arranged at the bottom of the bracket 2211 or the top of the water tank 222 according to the arrangement direction and form of the filter screen 213 . In the present embodiment, the channel 224 in the form of a groove is arranged around the top of the water tank 222 as an example for illustration, but it is not limited thereto. The top of the water tank 222 is also provided with a water outlet 2221 and a water inlet 2222, which are respectively formed on the surface in the flow channel 224 and communicate with the flow channel 224. In addition, the water outlet 2221 and the water inlet 2222 are respectively located on opposite sides of the top of the water tank 222 , so that a flow path for the liquid to flow from the water outlet 2221 to the water inlet 2222 is formed in the flow channel 224 .

The pump assembly 223 is connected to the water tank 222, which can be connected to the liquid in the water tank 222 and the water outlet 2221 through a pipeline, or is arranged in the water tank 222 in the form of a water pump to pump the liquid in the water tank 222 to the water outlet 2221 , so that the liquid can flow into the flow channel 224 from the water outlet 2221, and through the guidance of the flow channel 224, flow back from the water inlet 2222 to the water tank 222 (as shown in FIG. 5 ), so that between the humidifier 221 and the water tank 222 Form a water circulation system. At the same time, during the flow of the liquid, since the bottom side of the humidifying layer 2212 is in contact with the flow channel 224 and is pressed against the flow channel 224 by the engaging part 2213, the liquid can flow from the bottom side of the humidifying layer 2212 through physical action. Adsorb upward to the side of the humidifying layer 2212 adjacent to the engaging portion 2213 , so as to wet the entire humidifying layer 2212 . The remaining liquid flows along the flow channel 224 to the water inlet 2222 , and flows back into the water tank 222 , so as to prevent excessive liquid from overflowing from the flow channel 224 .

Please refer to Figure 5 to Figure 7. At this time, in conjunction with the operation of the fan assembly 140 on the host 10, the dry and turbid air from the external environment is guided by the air flow (as shown by the arrows in FIG. 6 and the arrows on the left and right sides in FIG. The filter screen 213 enters the purification assembly 20 to carry out the first purification procedure, for example, remove larger particles of impurities from the air. Next, the purified air is guided by the airflow, contacts and passes through the humidification layer 2212, filters out residual impurities, and carries moisture from the humidification layer 2212 to form clean humidified air. Afterwards, the clean humidified air is continuously guided by the airflow generated by the fan assembly 140 to discharge the clean humidified air to the external environment.

It can be understood that, in order to improve the wetting efficiency of the liquid in the flow channel 224 to the wetting layer 2212 and to prevent the liquid from overflowing to the outside of the flow channel 224, in some embodiments of the present application, the flow channel 224 can be arranged along the water outlet 2221 is inclined toward the side of the water inlet 2222; or selectively set the water outlet 2221 as a nozzle-like structure protruding from the surface of the flow channel 224, so as to prevent the liquid from flowing back into the water tank 222 from the water outlet 2221, and the flow rate of the liquid and flow velocity hindered. In some embodiments of the present application, the water inlet 2222 can also be selectively set as a funnel-shaped structure whose inner diameter tapers toward the surface of the concave flow channel 224; or a position corresponding to the water inlet 2222 in the water tank 222 A backflow stop valve 2223 is also provided to prevent the liquid that has flowed back into the water tank 222 from being poured back into the flow passage 224 from the water inlet 222 .

In one application scenario, the air purification device can manually start the operation of the humidification module of the purification component, or in the air purification device equipped with a detection module, the detection module can detect the ambient humidity, and let the control unit correspond to the humidity based on the detection result. Start the humidification module operation. At this time, the control unit drives the pump assembly to pump the liquid in the water tank to the water outlet, so that the liquid flows out into the flow channel through the water outlet, and flows through the humidifying layer of the humidifier along the flow channel, so that the liquid is adsorbed or absorbed by the humidifying layer . Part of the liquid that is not adsorbed or absorbed by the humidification layer flows toward the water inlet and returns to the water tank. With the continuous supply of liquid, the humidification layer of the humidifier is infiltrated by the liquid in the flow channel. When the air purified through the filter passes through the humidification layer, in addition to removing residual impurities through the humidification layer and the liquid adsorbed on the humidification layer to achieve the effect of purification again, it can also carry liquid molecules after passing through the humidification layer. Purified air is filled with water vapor to achieve humidification effect. Finally, the purified humidified air escapes to the external environment driven by the fan assembly, so that the air quality of the external environment is improved.

As an additional note, in the embodiment of this application, the liquid stored in the water tank can be replaced with other types of liquid besides clean water, such as essential oils with aroma or insect repellants or other materials that help maintain Liquid substances with fresh ambient air, etc., can achieve the effect of fragrant air and improving the air quality in the environment.

Also, see Figure 8. In other embodiments of the present application, the flow channel 224 of the humidification module 220 may also be configured in the form of a plurality of secondary flow channels. For example, it consists of a first flow channel 2241 surrounding the top of the water tank 222 and a second flow channel 2242 surrounding the top of the humidifier 221 . Wherein, the first flow channel 2241 can be correspondingly arranged above the humidification layer 2212 , for example, at the engaging portion 2213 of the bracket 2211 , and a plurality of spray holes 2243 corresponding to the humidification layer 2212 are opened in the first flow channel 2241 . The water inlet 2222 of the water tank 222 is connected to the surface of the first flow channel 2241 , and the water outlet 2221 can be connected to the surface of the second flow channel 2242 through a pipe. The liquid in the water tank 222 is pumped by the pump assembly 223 , flows into the second channel 2242 from the water outlet 2221 , and wets the humidification layer 2212 from top to bottom through the spray hole 2243 . The liquid that is not adsorbed or absorbed by the humidification layer 2212 continuously flows into the first channel 2241 , is guided to the water inlet 2222 , and flows back into the water tank 222 .

Therefore, in this embodiment, the water outlet 2221 and the water inlet 2221 of the water tank 222 can be located on the same side or opposite sides of the water tank 222, and neither will hinder the liquid from flowing out from the water outlet 2221 and from the water inlet 2222 back to the water tank 222 within.

In the application scenario of the above embodiment, when the humidification module is activated, the pump assembly pumps the liquid in the water tank to the water outlet, so that the liquid flows out into the first flow channel and circulates along the first flow channel. Then flow through the multiple spray holes to the humidification layer of the humidifier, so that the liquid is absorbed or absorbed by the humidification layer. With the continuous supply of liquid, the wetting layer is wetted by the liquid and becomes saturated. The liquid that is not adsorbed or absorbed by the humidification layer continues to flow toward the first flow channel, and flows back into the water tank from the water inlet.

In addition, in the application scenarios of other embodiments, it is also possible to set the water outlet of the water tank on the first flow channel and the second flow channel at the same time, so that the liquid can actively flow into the humidifying layer from above the humidifying layer and be humidified from below the humidifying layer. Adsorption or absorption to achieve the effect of accelerating the wetting of the humidification layer, so as to humidify the purified air in a more real-time manner and quickly improve the air quality of the external environment.

The above descriptions are only examples of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and changes may occur in this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

An air purification device, characterized in that it comprises:

host; and

The purification assembly is detachably arranged on the host, the purification assembly includes a filter module and a humidification module, the filter of the filter module surrounds the periphery of the humidification module, wherein the humidification module is provided with a flow channel, And the humidification module includes:

The water tank is provided with a water outlet and a water inlet, respectively connected to the flow channel;

a humidifier including a humidifying layer corresponding to the filter and in contact with the flow channel; and

A pump assembly, connected to the water tank, used to pump the liquid in the water tank to the water outlet, the liquid circulates in the flow channel through the water outlet, wets the humidification layer, and water from the inlet return to the tank.
The air cleaning device according to claim 1, wherein the humidifier is arranged on the water tank, and the flow channel is arranged around the humidifier and the water tank.
The air purification device according to claim 2, wherein the flow channel is formed on the top of the water tank, and the water outlet and the water inlet are respectively formed on the flow channel at two opposite sides of the water tank. on the road.
The air purification device according to claim 3, wherein the water outlet protrudes from the surface of the flow channel, and the inner diameter of the water inlet tapers toward the direction of being concave on the surface of the flow channel.
The air cleaning device according to claim 2, wherein the flow channel comprises a first flow channel and a second flow channel, the first flow channel is arranged around the humidifier and the water tank, the The second flow channel is arranged around the humidifier, and is provided with a plurality of spray holes corresponding to the humidification layer, wherein the water outlet is connected to the surface of the second flow channel, and the water inlet is connected to the surface of the second flow channel. On the surface of the first flow channel, the liquid wets the wetting layer through the plurality of spray holes, and flows back to the water inlet through the first flow channel.
The air cleaning device according to claim 1, characterized in that, the flow channel is arranged obliquely along the side of the water outlet towards the water inlet.
The air purification device according to claim 1, wherein the water inlet is provided with a reverse flow stop valve.
The air purification device according to claim 1, wherein the humidification module further includes a bracket, the outer surface of the bracket is provided with a locking part, the bracket is arranged on the water tank, and the humidification layer surrounds the It is arranged on the outer surface and fastened on the flow channel through the engaging portion.
An air purification device, characterized in that it includes a host and a detachable humidification module arranged on the host, and the humidification module includes:

The water tank is provided with a flow channel on the top, and a water outlet and a water inlet are provided on opposite sides of the flow channel;

a humidifier, including a humidification layer, disposed on the flow channel; and

A pump assembly, connected to the water tank, used to pump the liquid in the water tank to the water outlet, the liquid circulates in the flow channel through the water outlet, wets the humidification layer, and flows from the water inlet return to the tank.
The air purification device according to claim 9, wherein the humidification module further includes a bracket, the outer surface of the bracket is provided with a locking part, the humidification layer is arranged around the outer surface, and passes through the The fastening portion is fastened on the flow channel.
A purification assembly, characterized in that it includes a filter module and a humidification module, the filter of the filter module surrounds the periphery of the humidification module, and the humidification module includes:

In the water tank, a flow channel is arranged around the top, and a water outlet and a water inlet are arranged at intervals on the flow channel;

a humidifier arranged on the top of the water tank, the humidifying layer of the humidifier corresponds to the filter screen and is in contact with the flow channel; and

A pump assembly, connected to the water tank, used to pump the liquid in the water tank to the water outlet, the liquid circulates in the flow channel through the water outlet, wets the humidification layer, and water from the inlet return to the tank.
A humidification module, characterized in that, comprising:

The water tank is provided with a water outlet and a water inlet, respectively connected to the flow channel;

a humidifier including a humidifying layer corresponding to the filter and in contact with the flow channel; and

A pump assembly, connected to the water tank, used to pump the liquid in the water tank to the water outlet, the liquid circulates in the flow channel through the water outlet, wets the humidification layer, and water from the inlet return to the tank.
The humidification module according to claim 12, wherein the humidifier is arranged on the water tank, the flow channel is arranged around the top of the water tank, and the water outlet and the water inlet are respectively located at the top of the water tank. Two opposite sides of the water tank are formed on the flow channel.
The humidification module according to claim 13, wherein the water outlet protrudes from the surface of the flow channel, and the inner diameter of the water inlet is tapered toward the direction of being concave on the surface of the flow channel.
The humidification module according to claim 12, wherein the flow channel comprises a first flow channel and a second flow channel, the first flow channel is arranged around the top of the water tank, and the second flow channel is arranged around Above the humidifier, there are a plurality of spray holes corresponding to the humidifying layer, wherein the water outlet is connected to the surface of the second flow channel, and the water inlet is connected to the surface of the first flow channel , the liquid wets the wetting layer through the plurality of spray holes, and flows back to the water inlet through the first channel.
The humidification module according to claim 12, wherein the flow channel is arranged obliquely along a side of the water outlet facing the water inlet.
The humidification module according to claim 12, wherein the water inlet is provided with a reverse flow stop valve.
The humidification module according to claim 12, characterized in that, the humidification module further comprises a bracket, an engaging portion is arranged on the outer surface of the bracket, the bracket is arranged on the water tank, and the humidification layer surrounds It is arranged on the outer surface and fastened on the flow channel through the engaging portion.