CN212842099U

CN212842099U - Air purifier

Info

Publication number: CN212842099U
Application number: CN202021389261.4U
Authority: CN
Inventors: 李彬; 张鹏; 陈旭
Original assignee: Shenzhen Yike Optoelectronic Technology Co ltd
Current assignee: Shenzhen Yike Optoelectronic Technology Co ltd
Priority date: 2020-07-15
Filing date: 2020-07-15
Publication date: 2021-03-30
Anticipated expiration: 2030-07-15
Also published as: WO2022012112A1

Abstract

The utility model relates to an air purifier. The air purifier includes: the filter part comprises a first shell, a fan and a filter unit, the first shell is provided with an accommodating cavity, an air inlet and an air outlet, the air outlet and the air inlet are communicated with the accommodating cavity and an external space, a channel between the filter unit and the air outlet is a purification channel, a channel between the filter unit and the air inlet is a channel to be purified, the fan and the filter unit are arranged in the accommodating cavity and connected with the first shell, and the fan can drive gas in the channel to be purified to the purification channel; the sterilizing part comprises a second shell and a sterilizing lamp, the sterilizing lamp is arranged on one side, close to the first shell, of the second shell, the sterilizing lamp can be used for irradiating the filtering unit to achieve sterilization, and the second shell is movably connected with the first shell to enable the sterilizing lamp to enter and exit the first shell. The sterilizing lamp can kill bacteria and viruses on the filtering unit; and by making the first housing far away from the second housing, the sterilizing lamp is exposed to the external space, thereby sterilizing the external space.

Description

Air purifier

Technical Field

The utility model relates to an air purification technical field especially relates to an air purifier.

Background

The purifying principle of the filter unit type air purifier is that a built-in fan is adopted, air is driven to pass through the filter unit through the fan, particles, bacteria, viruses and the like in the air are intercepted by the filter unit, and therefore the air is purified.

However, in a general filter unit type air purifier, bacteria and viruses in the air are often attached to the filter unit and are difficult to kill when passing through the filter unit. After long-term accumulation, the air purified by the filtering unit inevitably carries a considerable amount of bacteria and viruses, so that the air purification effect is greatly reduced.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide an air purifier to solve the problem of how to kill bacteria and viruses on the filter unit.

An air purifier, comprising:

the filter part comprises a first shell, a fan and a filter unit, wherein the first shell is provided with an accommodating cavity, an air inlet and an air outlet, the air outlet and the air inlet are communicated with the accommodating cavity and an external space, a channel between the filter unit and the air outlet is a purification channel, a channel between the filter unit and the air inlet is a channel to be purified, the fan and the filter unit are arranged in the accommodating cavity and connected with the first shell, and the fan can drive gas in the channel to be purified to the purification channel; and

the sterilizing part comprises a second shell and a sterilizing lamp, wherein the sterilizing lamp is arranged on one side of the first shell, the second shell is close to the first shell, the sterilizing lamp can be used for irradiating the filtering unit, the filtering unit is right to realize sterilization, and the second shell is movably connected with the first shell, so that the sterilizing lamp can enter and exit the first shell.

Above-mentioned air purifier is through setting up the sterilamp is in order to shine the filter unit to can kill bacterium and virus on the filter unit, it is right to realize the sterilizing effect of filter unit. On the other hand, the first housing can be away from the second housing along the connecting piece, so that the sterilizing lamp arranged on one side of the second housing close to the first housing can be exposed, and the environment around the air purifier can be irradiated to realize sterilization. By arranging the sterilizing lamp, bacteria and viruses on the filtering unit can be killed, and the air purification effect is improved; in addition, the sterilizing lamp can be exposed to the outside space by separating the first housing from the second housing, and the outside space of the air purifier can be irradiated and sterilized.

In one embodiment, the fan is disposed in the purge passage.

In one embodiment, the filter unit is a hollow cylindrical structure, the inner side surface of the filter unit faces the purification channel, and the outer side surface of the filter unit faces the channel to be purified.

In one embodiment, the air purifier comprises at least one of the following:

the air inlet is formed in the area, facing the outer side face of the filtering unit, of the first shell;

the air outlet is formed in one side, far away from the second shell, of the first shell.

In one embodiment, a through hole is formed in one side of the first shell, which is close to the second shell, the through hole is communicated with the purification channel, and the sterilization lamp can extend into or separate from the purification channel through the through hole.

In one embodiment, the air inlet is opened at one side of the first shell close to the second shell, and the sterilizing lamp can extend into the channel to be purified through the air inlet.

In one embodiment, the second housing is provided with an air inlet channel, the air inlet channel is communicated with the channel to be purified, and the sterilizing lamp can extend into the channel to be purified along with the approach of the second housing to the first housing.

In one embodiment, the connector is fixed to one of the first shell and the second shell, and the other of the first shell and the second shell is provided with a guide groove matched with the connector.

In one embodiment, the first housing and the second housing are both provided with screw grooves, and the screw grooves of the first housing can be engaged with the screw grooves of the second housing.

In one embodiment, the air purifier comprises at least one of the following:

the air purifier comprises a circuit board and a battery, the circuit board and the battery are arranged on any one of the first shell and the second shell, and the circuit board is electrically connected with the fan, the sterilizing lamp and the battery;

the air purifier comprises a circuit board, wherein the circuit board is arranged in any one of the first shell and the second shell, a power interface is arranged in any one of the first shell and the second shell, and the power interface is electrically connected with the circuit board.

Drawings

FIG. 1 is an isometric view of an air purifier in a closed position according to one embodiment of the present application;

FIG. 2 is a front view of an air purifier in a closed position according to an embodiment of the present application;

FIG. 3 is a side view of an air purifier in a closed position according to one embodiment of the present application;

FIG. 4 is a rear view of an air purifier in a closed position according to one embodiment of the present application;

FIG. 5 is a top view of an air purifier according to an embodiment of the present application;

FIG. 6 is a cross-sectional view of the air purifier of FIG. 5 in a closed position along the direction K-K;

FIG. 7 is an isometric view of an air purifier in a disengaged state according to one embodiment of the present application;

FIG. 8 is a front view of an air purifier in a disengaged state according to an embodiment of the present application;

FIG. 9 is a sectional view of the air cleaner of FIG. 5 in a separated state in a K-K direction;

FIG. 10 is a side view of an air purifier in a disengaged state according to one embodiment of the present application;

fig. 11 is a cross-sectional view of the air cleaner at another viewing angle in the state of fig. 9.

The air purifier 10, the filter part 110, the first housing 111, the accommodating cavity 1112, the air inlet 1113, the air outlet 1114, the through hole 1115, the fan 112, the filter unit 113, the purifying channel 1116, the channel to be purified 1117, the sterilizing part 120, the second housing 121, the sterilizing lamp 122, the guide groove 1211, the bump 1212, the battery 1213, the circuit board 1214, the power interface 1215, the connecting part 130, the elastic part 131, the control button 1216, and the first direction a.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The purification principle of the conventional air purifier 10 with a filter unit 113 is to use a built-in fan 112 to drive air through the filter unit 113 by the fan 112, so as to intercept particles, bacteria, viruses, etc. in the air by the filter unit 113, thereby achieving the effect of purifying the air.

However, in the general air purifier 10 with the filter unit 113, bacteria and viruses in the air are often attached to the filter unit 113 and are difficult to kill when passing through the filter unit 113. After long-term accumulation, the air purified by the filtering unit 113 inevitably carries a considerable amount of bacteria and viruses, thereby greatly reducing the air purifying effect. To this end, the present application provides an air purifier 10 to solve the above-described problems.

Referring to fig. 1 to 6, there are shown schematic structural views of an air purifier 10 in a closed state according to an embodiment of the present application. In the embodiment of the present application, the air purifier 10 includes the filter part 110 and the sterilizing part 120, and the filter part 110 is movably coupled to the sterilizing part 120 so that the filter part 110 can be close to or remote from the sterilizing part 120.

Specifically, the filtering portion 110 includes a first housing 111, a fan 112 and a filtering unit 113, the first housing 111 has an accommodating cavity 1112, an air inlet 1113 and an air outlet 1114, the air outlet 1114 and the air inlet 1113 both communicate the accommodating cavity 1112 and an external space, a channel between the filtering unit 113 and the air outlet 1114 is a purifying channel 1116, a channel between the filtering unit 113 and the air inlet 1113 is a channel 1117 to be purified, the fan 112 and the filtering unit 113 are arranged in the accommodating cavity 1112 and connected to the first housing 111, and the fan 112 can drive gas of the channel 1117 to be purified to the purifying channel 1116. The purifying channel 1116 and the channel to be purified 1117 are both part of the accommodating cavity 1112.

The sterilizing part 120 includes a second housing 121 and a sterilizing lamp 122, the sterilizing lamp 122 is disposed at one side of the second housing 121 close to the first housing 111, and the sterilizing lamp 122 can be used to irradiate the filtering unit 113 to sterilize the filtering unit 113. In addition, the second housing 121 is movably connected to the first housing 111. Movable connections include, but are not limited to, sliding connections, rolling connections, and screw connections. The filter part 110 and the sterilization part 120 the filter part 110 is movably coupled to the sterilization part 120, so that the filter part 110 can be close to or far from the sterilization part 120, and the sterilization lamp 122 can be moved in and out of the first housing 111.

The air purifier 10 can kill bacteria and viruses on the filter unit 113 by providing the sterilizing lamp 122 to irradiate the filter unit 113, thereby achieving a sterilizing effect on the filter unit 113. On the other hand, since the first housing 111 can be separated from the second housing 121, the sterilization lamp 122 provided on the side of the second housing 121 close to the first housing 111 can be exposed, and the environment around the air cleaner 10 can be irradiated to sterilize the air. In the above way, the sterilizing lamp 122 is arranged, so that bacteria and viruses on the filtering unit 113 can be killed, and the air purification effect is improved; further, by separating the first housing 111 from the second housing 121, the sterilizing lamp 122 can be exposed to the outside space, and the outside space of the air cleaner 10 can be irradiated and sterilized.

Referring to the embodiment shown in fig. 1 to 5, the first housing 111 has a cylindrical structure, and one bottom surface of the first housing 111 faces away from the second housing 121; the other bottom surface faces the second case 121 and abuts against the second case 121 in the closed state. The air outlet 1114 is disposed on a bottom surface of one side of the first housing 111 away from the second housing 121, and the air outlet 1114 includes a plurality of annular ventilation slots disposed at intervals, and the annular ventilation slots communicate with the accommodating cavity 1112 and an external space. The side of first casing 111 is seted up in income wind gap 1113, and goes into wind gap 1113 and include the arc ventilation groove that many intervals were seted up, and the arc ventilation groove extends along the circumference of first casing 111, and arc ventilation groove intercommunication holding chamber 1112 and exterior space. It should be noted that the number of the annular ventilation slots and the arc-shaped ventilation slots, the structures and the opening positions of the air inlet 1113 and the air outlet 1114 are not limited to the embodiments shown in the figures, and the structures of the first housing 111 and the second housing 121 are not limited to the structures shown in the embodiments in the figures.

In some embodiments, the filtering unit 113 is a hollow cylindrical structure, the axial direction of the filtering unit 113 is a first direction a, an air outlet 1114 is formed on one side of the first casing 111 away from the second casing 121 along the first direction a, and an air inlet 1113 is formed in a region of the first casing 111 where the outer side surface of the filtering unit 113 faces. In some embodiments, the outer side of the filter unit 113 is spaced from the first housing 111, i.e. spaced from the wall of the accommodating cavity 1112. The filter unit 113 and the two opposite ends along the first direction a are respectively connected to the first housing 111, that is, connected to the cavity wall of the accommodating cavity 1112, and the connection can be realized by common connection methods such as clamping, bonding, and the like. A purifying channel 1116 is formed between the space of the accommodating cavity 1112 surrounded by the inner side surface of the filtering unit 113 and the air outlet 1114, the space of the accommodating cavity 1112 between the outer side surface of the filtering unit 113 and the air inlet 1113 is a channel 1117 to be purified, at this time, the inner side surface of the filtering unit 113 faces the purifying channel 1116, and the outer side surface of the filtering unit 113 faces the channel 1117 to be purified. Note that the first direction a is directed from the second housing 121 to the first housing 111.

The fan 112 can drive the air flow in the accommodating cavity 1112 to drive the air in the channel to be cleaned 1117 to pass through the filter unit 113 to the cleaning channel 1116, and then to be discharged from the air outlet 1114. As the gas in the channel to be cleaned 1117 flows toward the cleaning channel 1116, the external gas outside the air inlet 1113 enters the channel to be cleaned 1117 from the air inlet 1113, so as to form a gas circulation.

In some embodiments, the fan 112 is disposed in the purge channel 1116. Specifically, the fan 112 may be disposed in a space surrounded by the inner side surface of the filtering unit 113, or may be disposed on a passage from the space to the air outlet 1114. By disposing the fan 112 in the purifying channel 1116, impurities such as dust particles can be prevented from adhering to the blades of the fan 112, so as to keep the blades clean, thereby ensuring the wind power of the fan 112.

In the embodiment shown in fig. 6, the number of the fans 112 is one, but it should be noted that the number of the fans 112 may be two, three or more according to the actual design requirement.

Referring to fig. 6, in some embodiments, the filter portion 110 abuts the sterilizing portion 120 when the air purifier 10 is in the closed state. When the air purifier 10 is in the closed state, the second housing 121 is close to the first housing 111, and the sterilizing lamp 122 disposed on the second housing 121 extends into the accommodating cavity 1112 to irradiate the filtering unit 113. In some embodiments, the filtering unit 113 may be a common sieve, filter paper, or the like.

Specifically, referring to the structure described in the above embodiments, in some embodiments, the filter unit 113 has a hollow cylindrical structure, and the first housing 111 further has a through hole 1115 formed at a side close to the second housing 121, where the through hole 1115 is formed along the first direction a. The filter unit 113 is disposed around the through-hole 1115, and the through-hole 1115 communicates with a space surrounded by the filter unit 113, that is, the through-hole 1115 communicates with the purge channel 1116. When the air purifier 10 is in the closed state, the germicidal lamp 122 protrudes through the through-hole 1115 into the space surrounded by the filter unit 113, and the inner side of the filter unit 113 faces the germicidal lamp 122, thereby enabling the germicidal lamp 122 to irradiate the filter unit 113.

In other embodiments, the filter unit 113 has a planar or approximately planar structure, in these embodiments, the air inlet 1113 may also be opened on one side of the first casing 111 close to the second casing 121, the air outlet 1114 is still opened on one side of the first casing 111 far from the second casing 121, one side of the filter unit 113 faces the air inlet 1113, and the other side faces the air outlet 1114, when the air purifier 10 is in the closed state, the germicidal lamp 122 extends into the to-be-purified passage 1117 through the air inlet 1113. In some embodiments, in the air purifier 10 in the closed state, a gap exists between the first casing 111 and the second casing 121, so that the external air can reach the air inlet 1113 from the gap between the first casing 111 and the second casing 121 and enter the to-be-purified passage 1117. In other embodiments, in the air purifier 10 in the closed state, the first housing 111 and the second housing 121 are tightly attached to each other, the second housing 121 is provided with an air inlet channel, the air inlet channel communicates with one side of the second housing 121 close to the first housing 111 and the other side adjacent to the one side, the air inlet channel communicates with the channel to be purified 1117 at one side of the second housing 121 close to the first housing 111, the germicidal lamp 122 extends into the channel to be purified 1117 when the air purifier 10 is in the closed state, and one side of the filter unit 113 facing the air inlet 1113 also faces the germicidal lamp 122, so that the germicidal lamp 122 can irradiate the filter unit 113.

In some embodiments, the germicidal lamp 122 has a cylindrical structure and extends in the first direction a. The germicidal lamp 122 includes, but is not limited to, a hot cathode tube, a cold cathode tube, an ultraviolet LED chip, etc. light sources capable of emitting ultraviolet light.

Referring to fig. 7 to 10, fig. 7 and 8 show schematic views when the filter part 110 is separated from the sterilizing part 120. In some embodiments, the air cleaner 10 includes a connector 130, the connector 130 is fixed to one of the first housing 111 and the second housing 121, the other of the first housing 111 and the second housing 121 is formed with a guide groove 1211 engaged with the connector 130, and the connector 130 extends into the guide groove 1211 to fix a moving direction of the first housing 111.

Specifically, referring to the embodiment illustrated in fig. 6 and 9, the movable connection structure of the first housing 111 and the second housing 121 in the embodiment illustrated in the drawings is a sliding connection design. Specifically, the connecting member 130 is a cylindrical structure, the connecting member 130 is fixed to the first housing 111 and extends along the direction opposite to the first direction a, and the second housing 121 has a guide groove 1211 on a side thereof close to the first housing 111. One end of the connecting member 130 is fixedly connected to the first housing 111; the other end extends into a guide groove 1211 of the second housing 121 and is slidable in the guide groove 1211, the guide groove 1211 being used to fix the sliding direction of the connector 130. The first housing 111 can be accurately reciprocated in the first direction a by the guide action of the guide groove 1211 on the link 130. In addition, in this embodiment, a protrusion 1212 facing the connecting member 130 is disposed in the guide slot 1211, an end of the connecting member 130 extending into the guide slot 1211 is disposed with an elastic member 131, the elastic member 131 may be an elastic member capable of being elastically deformed, such as a spring, and the protrusion 1212 is used for limiting the movement of the elastic member 131 in the guide slot 1211. It should be noted that, in other embodiments, the connecting member 130 may also be fixed to the second housing 121, and the guide groove 1211 may also be opened in the first housing 111.

When the first housing 111 needs to be moved in the first direction a to convert the air cleaner 10 into the separated state, the connecting member 130 moves away from the bottom of the guide slot 1211 along with the first housing 111 in the first direction a, and the elastic member 131 passes through the protrusion 1212. In the case of applying a force in the first direction a to the first housing 111 from the outside, the elastic element 131 passes through the bump 1212, and deforms to pass over the bump 1212 when passing over the bump 1212, and is restricted to a side of the bump 1212 close to the first housing 111 after passing over the bump 1212. After passing over the bump 1212 in the first direction a, the bump 1212 can support the elastic member 131, and limit the connection member 130 from returning to the bottom of the guide groove 1211 in the direction opposite to the first direction a, so as to maintain the first housing 111 at a spaced distance from the second housing 121, and to maintain the sterilizing lamp 122 disposed on the side of the second housing 121 close to the first housing 111 exposed to the external space.

Conversely, when it is necessary to move the first housing 111 in the opposite direction of the first direction a to convert the air cleaner 10 into the closed state, a force in the opposite direction of the first direction a is applied to the first housing 111 to drive the elastic member 131 to pass over the protrusion 1212 in the opposite direction of the first direction a, so that the connecting member 130 returns to the bottom of the guide groove 1211 to move the first housing 111 toward the second housing 121.

A simple clamping structure is formed between the bump 1212 and the elastic element 131, so that the first housing 111 can keep a fixed distance from the second housing 121 after being away from the second housing 121. And further, at least two protrusions 1212 may be disposed in the guide 1211, and the protrusions 1212 are spaced along the first direction a, so as to support the connecting member 130 at least two different positions, thereby providing more fixed distance for the first housing 111. It should be noted that, in some embodiments, the elastic member 131 may also be disposed in the guide slot 1211, and the protrusion 1212 is disposed on the connecting member 130.

In addition to the above-described design of the sliding connection, the movable connection structure between the first housing 111 and the second housing 121 may also be a screw connection design. Specifically, in some embodiments, the first housing 111 and the second housing 121 are both provided with a threaded groove, and the threaded groove of the first housing 111 can be engaged with the threaded groove of the second housing 121. By rotating the first housing 111 relative to the second housing 121, the first housing 111 is away from the second housing 121 along the first direction a while maintaining the connection with the second housing 121, so that the air purifier 10 is changed from the closed state to the separated state, and the germicidal lamp 122 is exposed to the external space. Of course, in some embodiments, the sterilizing lamp 122 may be exposed to the external space by rotating to separate the first housing 111 from the second housing 121, thereby sterilizing the external space.

Referring to fig. 11, on the other hand, in order to improve the convenience of the air purifier 10, the air purifier 10 according to some embodiments further includes a circuit board 1214 and a battery 1213, the circuit board 1214 and the battery 1213 are disposed in any one of the first housing 111 and the second housing 121, and the circuit board 1214 is electrically connected to the fan 112, the germicidal lamp 122, and the battery 1213. The battery 1213 is used to power the circuit board 1214, the fan 112, and the germicidal lamp 122. The circuit board 1214 is electrically connected to the fan 112 through traces for supplying power, and when the circuit board 1214 is disposed on the second housing 121 and the first housing 111 is connected to the second housing 121 through the connecting element 130, the traces connecting the circuit board 1214 and the fan 112 can be disposed on the connecting element 130.

In some embodiments, a power interface 1215 is formed on any one of the first casing 111 and the second casing 121, and the power interface 1215 is electrically connected to the circuit board 1214, and can be connected by a trace. The power interface 1215 may be, but is not limited to, a USB interface. By plugging in a power outlet with an external power cord to charge the battery 1213 for storage or direct power.

In some embodiments, a control button 1216 is disposed on the first housing 111 or the second housing 121, and the control button 1216 can be used to control the amount of wind force of the fan 112 and to control the activation and deactivation of the germicidal lamp 122.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An air purifier, comprising:

the sterilizing part comprises a second shell and a sterilizing lamp, wherein the sterilizing lamp is arranged on one side of the first shell, the second shell is close to the first shell, the sterilizing lamp can be used for irradiating the filtering unit, the filtering unit is right to realize sterilization, and the first shell is movably connected with the second shell, so that the sterilizing lamp can enter and exit the first shell.

2. The air cleaner of claim 1, wherein the fan is disposed in the purge passage.

3. The air purifier as claimed in claim 1, wherein the filter unit has a hollow cylindrical structure, an inner side of the filter unit faces the purifying passage, and an outer side of the filter unit faces the passage to be purified.

4. The air purifier of claim 3, comprising at least one of:

5. The air purifier of claim 1, wherein the first housing has a through hole at a side thereof adjacent to the second housing, the through hole being in communication with the purification channel, the germicidal lamp being capable of passing through the through hole into or out of the purification channel.

6. The air purifier of claim 1, wherein the air inlet is opened at a side of the first housing close to the second housing, and the sterilizing lamp can extend into the channel to be purified through the air inlet.

7. The air purifier as claimed in claim 6, wherein the second housing defines an air inlet channel, the air inlet channel is connected to the channel to be purified, and the germicidal lamp can extend into the channel to be purified along with the second housing approaching the first housing.

8. The air cleaner of claim 1, comprising a connector fixed to one of the first housing and the second housing, wherein the other of the first housing and the second housing defines a guide groove for engaging with the connector.

9. The air purifier of claim 1, wherein the first housing and the second housing are each provided with a threaded groove, and the threaded groove of the first housing is capable of engaging with the threaded groove of the second housing.

10. The air purifier of claim 1, comprising at least one of: