CN114259185B - Air inlet channel structure with primary filtering function, cyclone separator and dust collector - Google Patents

Abstract

The invention discloses an air inlet channel structure with a primary filtering function, a cyclone separator and a dust collector, and belongs to the technical field of gas-solid separation; the upper end of the spiral pipeline is provided with an air outlet pipe communicated with the spiral pipeline, and the air outlet pipe is provided with an air outlet; at least 1 primary filtering opening is arranged on the side wall of the spiral pipeline, which is far away from one side of the spiral central shaft. The air inlet channel structure with the primary filtering function provided by the invention is based on a cyclone separation principle and a coanda effect, and is used for carrying out primary filtering on air flow, so that larger dust and ash can be separated, the load of an downstream separating device of the air flow is reduced, and the disturbance of the large dust and ash in the air flow to the downstream air flow is reduced.

Description

An air inlet channel structure with primary filter function, cyclone separator and vacuum cleaner

technical field

The invention belongs to the technical field of gas-solid separation, and in particular relates to an air inlet channel structure with a primary filtering function, a cyclone separator and a vacuum cleaner.

Background technique

The existing dust cup type vacuum cleaner based on the cyclone separation principle usually has a cyclone cone in the dust collecting barrel. The dust-laden airflow enters the cyclone cone along the tangential direction, generating a high-speed rotating airflow. After the air is separated, the dust falls to the bottom, while the clean air flows out from the upper part of the cone. Because the dust separation efficiency of the cyclone cone is not high, the sponge or filter screen placed in front of the motor needs to be replaced frequently, or frequently cleaned, otherwise the dust collected on the sponge or filter screen will cause blockage and reduce the suction of the vacuum cleaner. In order to improve the efficiency of dust separation, multi-cone and multi-stage separation is usually adopted, which has complex structure, high pressure drop loss and noise, and high manufacturing cost.

Contents of the invention

In order to solve the above technical problems, the present invention adopts the following technical solutions:

An air inlet channel structure with primary filtering function, comprising a spiral duct, the inner wall of the spiral duct forms an air inlet channel, the lower end of the spiral duct is provided with an air inlet pipe communicating with it, and the air inlet pipe has an air inlet The upper end of the spiral pipe is provided with an air outlet pipe communicating with it, and the air outlet pipe has an air outlet; the side wall of the spiral pipe away from the spiral central axis is provided with at least one primary filter opening.

Further, the primary filter opening has a first opening wall and a second opening wall along the flow direction of the airflow, and an arc-shaped protrusion connected thereto is provided on the outer wall of the first opening wall; the protrusion is located at The side away from the second opening wall.

Further, the length of the primary filter opening along the direction of air flow is L, the radial distance between the inner side wall and the outer side wall of the spiral duct is a, and the section length of the raised portion along the direction of air flow is b, protruding The maximum height of the outer wall is c, the length range of the primary filter opening is 0.4<L/a<2; the end face length of the primary filter opening is b/a<0.5.

Further, the size of the protruding end surface of the protruding part is required to be b/a<1, c/a<0.6.

Further, the radius of the outer wall of the spiral pipe is R, the radius of the inner wall is r, the rotation angle of the spiral pipe is π-6π, and the axial layer height of the spiral central axis of the spiral pipe is the height of a single-layer spiral pipe 1-2.5 times; the distance between the outer wall and the inner wall of the spiral pipe is required to be 1.5<R/a<4.5.

Further, each of the primary filter openings corresponds to an independent dust collection area.

A cyclone separator, comprising the air inlet channel structure described in any one of the above with a primary filtering function.

A vacuum cleaner, comprising the above-mentioned cyclone separator.

Beneficial effect:

The air inlet channel structure with primary filter function provided by the present invention is based on the principle of cyclone separation and the Coanda effect. Separated to reduce the load on the downstream separation device of the airflow, and reduce the disturbance of the large dust in the airflow to the downstream airflow.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the air inlet channel structure with the primary filter function;

Fig. 2 is a schematic cross-sectional view of the dust-laden air flow in the primary filter channel;

Fig. 3 is the sectional top view of primary filter opening;

Fig. 4 is a cross-sectional top view of the primary filter opening without a raised portion;

Among them, 1. air inlet; 2. air inlet pipe; 3. spiral pipe; 301, outer wall; 302, inner wall; 4, primary filter opening; 401, raised part; 402, first opening wall; Two opening walls; 5, the air outlet.

Detailed ways

Example 1

Referring to Fig. 1-4, a kind of air inlet channel structure with preliminary filter function, comprises spiral pipe 3, and the inner wall of spiral pipe 3 forms air inlet channel, and the lower end of spiral pipe 3 is provided with the air inlet pipe that communicates with it, and air inlet pipe There is an air inlet 1; the upper end of the spiral duct 3 is provided with an air outlet pipe communicating with it, and the air outlet pipe has an air outlet 5; at least one primary filter opening is provided on the side wall of the spiral duct 3 away from the central axis of the spiral 4.

In this embodiment, a primary filter opening 4 is provided on the side wall of the spiral pipe 3 away from the spiral central axis.

In other embodiments, a plurality of primary filter openings 4 may be provided on the side wall of the spiral duct 3 away from the spiral central axis, wherein each primary filter opening 4 corresponds to an independent dust collection area.

In this embodiment, the primary filter opening 4 has a first opening wall 402 and a second opening wall 403 along the air flow direction.

In this embodiment, an arc-shaped protrusion 401 connected to the outer wall of the first opening wall 402 is provided; the protrusion 401 is located on a side away from the second opening wall 403 .

In this embodiment, the length of the primary filter opening 4 along the air flow direction is L, the radial distance between the inner side wall 302 and the outer side wall 301 of the spiral duct 3 is a, and the section length of the raised portion 401 along the air flow direction is b. The maximum height of the protruding outer wall 301 is c, the length range of the primary filter opening 4 is 0.4<L/a<2; the end face length of the primary filter opening 4 is b/a<0.5.

In this embodiment, the size of the protruding end surface of the protruding portion 401 is required to be b/a<1, and c/a<0.6.

In this embodiment, the radius of the outer wall 301 of the spiral duct 3 is R, the radius of the inner wall 302 is r, and the rotation angle of the spiral duct 3 is π-6π, that is, 0.5-3 cycles; the spiral central axis of the spiral duct 3 is axially The layer height is 1-2.5 times the height of the single-layer spiral pipe; the distance between the outer wall 301 and the inner wall 302 of the spiral pipe 3 is required to be 1.5<R/a<4.5.

In other embodiments, referring to FIG. 4 , the protrusion 401 may not be provided.

The working principle of the air inlet channel with primary filter function provided by this embodiment:

The air inlet channel with primary filter function provided in this embodiment is an air inlet channel with primary filter function based on the principle of cyclone separation and the Coanda effect. When dusty gas enters from the air inlet 1, it passes through the air inlet 2. After reaching the air inlet channel part of the spiral duct 3, the airflow performs centrifugal movement in the spiral duct 3, and the dust particles in the airflow, especially large dust particles, will approach the outer wall 301 of the air inlet channel under the action of centrifugal force, and The airflow near the inner side wall 302 will be relatively clean.

As shown in Figure 2, when the airflow flows through the primary filter opening 4, a part of the dust particles near the outer wall 301 of the air inlet passage will fly out from the opening (f1) under the action of centrifugal force; Under the influence of the raised portion 401 (the protruding end surface), a stronger Coanda effect is generated, and the airflow will entrain the dust particles close to the wall surface 301 to fly out in a certain arc (f2).

The airflow that has been preliminarily purified through the primary filter opening 4 will continue to advance along the channel with fine dust particles and enter the cyclone separation cone.

Example 2

A cyclone separator, comprising the air inlet channel structure provided in Embodiment 1 with a primary filtering function.

Example 3

A vacuum cleaner, comprising the cyclone separator provided in Embodiment 2.

The above are only preferred embodiments of the present invention, and do not limit the technical scope of the present invention in any way, so any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still belong to The scope of the technical solution of the present invention.

Claims (5)

1. The air inlet channel structure with the primary filtering function is characterized by comprising a spiral pipeline, wherein an air inlet channel is formed in the inner wall of the spiral pipeline, an air inlet pipe communicated with the spiral pipeline is arranged at the lower end of the spiral pipeline, and the air inlet pipe is provided with an air inlet; an air outlet pipe communicated with the spiral pipeline is arranged at the upper end of the spiral pipeline, and the air outlet pipe is provided with an air outlet; at least 1 primary filtering opening is arranged on the side wall of the spiral pipeline, which is far away from one side of the spiral central shaft; the length of the primary filtering opening along the airflow flowing direction is L, the radial distance between the inner side wall and the outer side wall of the spiral pipeline is a, the section length of the protruding part along the airflow flowing direction is b, the maximum height of the protruding outer wall surface is c, and the length range of the primary filtering opening is 0.4< L/a <2; the end face length of the primary filtering opening is b/a <0.5;

the primary filter opening is provided with a first opening wall and a second opening wall along the airflow flowing direction, and an arc-shaped protruding part connected with the first opening wall is arranged on the outer wall surface of the first opening wall; the boss is located on a side remote from the second opening wall; the protruding end face of the protruding part has the size of b/a <1 and c/a <0.6.

2. The air inlet channel structure with the primary filtering function according to claim 1, wherein the radius of the outer side wall of the spiral pipeline is R, the radius of the inner side wall of the spiral pipeline is R, the rotation angle of the spiral pipeline is pi-6pi, and the axial layer height of the spiral central shaft of the spiral pipeline is 1-2.5 times of the height of a single-layer spiral pipeline; the distance between the outer side wall and the inner side wall of the spiral pipeline is required to be 1.5< R/a <4.5.

3. The air intake passage structure with primary filtering function according to claim 2, wherein each primary filtering opening corresponds to an independent dust collecting area.

4. A cyclone separator comprising the inlet air channel structure with primary filtering function as claimed in any one of claims 1 to 3.

5. A vacuum cleaner comprising a cyclone separator as claimed in claim 4.

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