CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a national phase entry under 35 U.S.C. § 371 of International Application No. PCT/CN2019/082639 filed Apr. 15, 2019, which claims priority from Chinese Application Nos. 201821801185.6, filed Nov. 2, 2018, and 201821612353.7, filed Sep. 30, 2018, all of which are hereby incorporated herein by reference.

FIELD

The present disclosure relates to the technical field of electric home appliances, and more particularly, an air purifier.

BACKGROUND

As air pollution is becoming more and more serious, requirements for interior air quality are becoming higher and higher. An air purifier can remove suspended particulate matter in the air so as to provide relatively clean air to people.

Currently, an air purifier filters and purifies air mainly through a filter screen. Specifically, air is sucked in by a fan in the air purifier, passes a filter screen that absorbs suspended particulate matter, and, after the purification, is discharged. The sealing effect of the filter screen and the air inlet of the fan directly affects filtering efficiency. As time goes by, the filter screen becomes dirtier and dirtier with the accumulation of dust, unable to achieve the goal of purifying air. This requires a user to replace the filter screen regularly. In order to be able to replace the filter screen, the filter screens in the prior art are dismountable.

However, the sealing of a filter screen that is easy to dismount with the air inlet of a fan is relatively poor, while the dismounting of a filter screen that has good sealing with the air inlet of a fan is complicated, providing poor user experience.

SUMMARY

Embodiments of the present disclosure provide an air purifier that not only ensures the sealing of the air inlet line, but also permits easy mounting and dismounting of the filter screen.

The present disclosure provides an air purifier comprising a main unit, a base assembly provided below the main unit, a filter screen assembly provided inside the main unit and an air supply device provided above the filter screen assembly, wherein

the base assembly comprises a carrier part on which the filter screen assembly is provided and a lifting part that is located below the carrier part and abuts the carrier part,

the lifting part comprises a pull-push part and a lifting assembly which are configured such that when the pull-push part makes a translation in a first direction, the lifting assembly controls the carrier part to descend so as to separate the filter screen assembly from the air supply device, and when the pull-push part makes a translation in a second direction opposite to the first direction, the lifting assembly controls the carrier part to rise so as to achieve a sealed connection between the filter screen assembly and the air supply device.

Since the translation of the pull-push part is transformed into the vertical up-and-down movement of the lifting part which drives the carrier part to move vertically up and down, the rising and descending of the filter screen assembly are achieved easily and the force required for such an operation is reduced. Specifically, when the lifting part controls the carrier part to descend so as to separate the filter screen assembly from the air supply device, the replacement of the filter screen assembly by a user is facilitated. When the lifting part controls the carrier part to rise so as to achieve a sealed connection between the filter screen assembly and the air supply device, the sealing quality and the purification efficiency are improved.

In some embodiments, the lifting assembly is a screw lifting assembly that engages with the pull-push part, the screw lifting assembly and the pull-push part being configured such that

when the pull-push part is pulled outwards, the screw lifting assembly controls the carrier part to descend;

when the pull-push part is pushed inwards, the screw lifting assembly controls the carrier part to rise.

In some embodiments, the screw lifting assembly comprises a gear that engages with the pull-push part and a screw that is provided inside the gear and engages with the gear;

wherein a screw limiting stopper is provided on a bottom of the carrier part, inside the screw;

when the pull-push part is pulled outwards, the screw moves downwards so as to make the carrier part descend;

when the pull-push part is pushed inwards, the screw moves upwards so as to make the carrier part rise.

During the course of movement of the pull-push part, the rotation of the gear drives the screw to move in a synchronized manner under the action of inner threads. Thanks to the screw limiting stopper provided on the bottom of the carrier part and inside the screw, the rotation movement of the screw is limited such that the screw can only move vertically up and down.

In some embodiments, the base assembly further comprises an inner cover on which the pull-push part and the screw lifting assembly are provided.

In some embodiments, a snap and a positioning column are further provided on the inner cover;

wherein a limiting slot inside which the snap is engaged by snapping is provided on the pull-push part; and

wherein a positioning column around an outside of which the gear is provided is further provided on the inner cover.

Thanks to the snap and the limiting slot which is movable along the snap, the separation of the pull-push part from the gear during the course of movement is prevented, and the position of the pull-push part when the filter screen assembly is mounted in position can be located, thus facilitating the installation by a user.

Thanks to the positioning column, during the course of movement of the pull-push part, the gear is driven to rotate around a center of the positioning column. In other words, the positioning column performs the function of positioning the gear and preventing the gear from changing its position.

In some embodiments, the lifting assembly is a connecting rod assembly an end of which is connected with the carrier part, and the other end of which is connected with the pull-push part, the connecting rod assembly and the pull-push part being configured such that

when the pull-push part is pulled outwards, the connecting rod assembly controls the carrier part to descend;

when the pull-push part is pushed inwards, the connecting rod assembly controls the carrier part to rise.

In some embodiments, the connecting rod assembly comprises a connecting rod, an upper positioning pin and a lower positioning pin;

wherein a bottom of the carrier part is provided with an upper positioning pin slot, and a top of the pull-push part is provided with a lower positioning pin slot;

wherein the upper positioning pin traverses one end of the connecting rod and is provided inside the upper positioning pin slot; and

wherein the lower positioning pin traverses the other end of the connecting rod and is provided inside the lower positioning pin slot.

In some embodiments, one end of the connecting rod is provided with a circular through hole inside which the upper positioning pin is provided, and the other end of the connecting rod is provided with an elongated through hole inside which the lower positioning pin is provided;

when the pull-push part is pulled outwards, it drives the lower positioning pin to move to an end of the elongated through hole that is close to the pull-push part, causing the carrier part to descend;

when the pull-push part is pushed inwards, it drives the lower positioning pin to move to an end of the elongated through hole that is far away from the pull-push part, causing the carrier part to rise.

When the pull-push part is pulled outwards, it drives the lower positioning pin to move outwards to the end of the elongated through hole of the connecting rod that is close to the pull-push part. The connecting rod rotates around the upper positioning pin, and the angle between the connecting rod and the pull-push part gradually decreases, causing the carrier part to descend, thus achieving the separation of the filter assembly from the air supply device. When the pull-push part is pushed inwards, it drives the lower positioning pin to move inwards to the end of the elongated through hole of the connecting rod that is far away from the pull-push part. The connecting rod rotates around the upper positioning pin, and the angle between the connecting rod and the pull-push part gradually increases, causing the carrier part to rise, achieving the sealed connection between the filter assembly and the air supply device.

In some embodiments, the connecting rod assembly further comprises a fixing block on which a notch is provided, wherein the fixing block covers the upper positioning pin slot, and the connecting rod is provided inside the notch.

The notch guides the movement of the connecting rod, which is inside the notch when moving, thus preventing the overall deviation of the position of the connecting rod.

In some embodiments, the base assembly further comprises: an inner cover on which a sliding slot is provided, wherein the pull-push part is provided on the inner cover and a bottom of the pull-push part is provided with a thread stud that traverses the sliding lot to be connected with a sliding plate, wherein the thread stud is slidable inside the sliding slot.

Thanks to the thread stud and the sliding slot which are configured such that when the thread stud is stuck at an outer wall of the sliding slot, the pull-push part can no longer be pulled out, damages caused to the base assembly by blind pulling are prevented.

In some embodiments, a limiting rib is provided on a side wall of the pull-push part and a limiting snap is provided on the inner cover. When the pull-push part is pushed inwards to a point where the limiting rib engages in the limiting snap by snapping, the carrier part finishes its rising.

Thanks to the limiting snap and the limiting rib, the position of the pull-push part when the filter assembly is mounted in its position can be located, thus facilitating the installation by a user.

In some embodiments, a pull-push guiding part is provided on the inner cover and the pull-push part comprises a pull-push body and a handle that is located inside the pull-push guiding part and moveable along the pull-push guiding part.

Thanks to the pull-push guiding part along which the pull-push part can move, the problem of unease in operation caused by left-to-right swinging of the pull-push part is avoided.

In some embodiments, the base assembly further comprises a base upper cover that has an opening with a flange, wherein a bottom end of the carrier part is provided with a turn-up which is configured to abut the flange. When the filter screen assembly is sealingly connected with the air supply device, the carrier part protrudes through the opening. When the filter screen assembly is separated from the air supply device, a top of the carrier part is located in the same plan as that of the base upper cover.

When the carrier part has risen to a certain height, the turn-up abuts the flange, thus preventing the carrier part from swinging or separating from the screw lifting assembly during the course of utilization.

In some embodiments, a handle passage hole through which at least part of the pull-push part protrudes is provided on the base upper cover.

The fact that at least part of the pull-push part protrudes through the handle passage hole allows to expose the pull-push part to the exterior, facilitating its operation by a user.

In some embodiments, the main unit comprises a side door panel assembly and a rear door panel assembly, the filter screen assembly being provided inside a cavity enclosed by the side door panel assembly and the rear door panel assembly which are connected in a dismountable manner, a user operable portion of the pull-push part being provided at the side of the rear door panel assembly.

The configuration of the present disclosure and its other objectives and beneficial effects will become clearer through the description of preferred embodiments in reference to the accompanying drawings.

