CN112386167A

CN112386167A - Grille filter, filtering system and dust collector

Info

Publication number: CN112386167A
Application number: CN201910758802.1A
Authority: CN
Inventors: 陈锋; 吴兴; 金松涛
Original assignee: Bosch Power Tools China Co Ltd
Current assignee: Bosch Power Tools China Co Ltd
Priority date: 2019-08-16
Filing date: 2019-08-16
Publication date: 2021-02-23

Abstract

The invention discloses a grille filter for a filter system, comprising: the filter comprises a filter housing, an air inlet and an air outlet arranged on the filter housing, and a plurality of grids arranged to extend from the air inlet to the air outlet inside the filter housing, wherein a slit capable of being filled with liquid is formed between the plurality of grids, so that gas can be in contact with the liquid in the slit during flowing from the air inlet to the air outlet. The invention also discloses a filtering system for the dust collector, which comprises the grille filter. The invention also discloses a vacuum cleaner comprising a negative pressure source, the filter system connected to the negative pressure source, and an air inlet pipe or a suction head connected to the first air inlet channel of the filter system.

Description

Grille filter, filtering system and dust collector

Technical Field

The present invention relates to a grill filter for a filtering system, a filtering system including the grill filter, and a vacuum cleaner including the filtering system.

Background

Early cleaners generally employed dust bags, i.e., dust and dirt separated from air by the dust bag, and materials used to manufacture the dust bags included paper, non-woven fabrics, and the like. Dust bag cleaners have been in use today. The dust bag type cleaner has an advantage in convenience because the dust bag can be disposable as a consumable, greatly simplifying maintenance of the cleaner. A disadvantage of a dust bag cleaner is that the suction of the cleaner gradually decays over time.

The current mainstream cleaners generally employ cyclonic separators, i.e. separation of dirt and dust from air is accomplished by centrifugal force only, without the use of any consumables. In contrast to a dust bag cleaner, the cyclone type cleaner does not require supplementary consumables, and the suction force of the cleaner can be restored by deep cleaning of the cleaner. A disadvantage of cyclonic separation cleaners is that their construction is generally more complex than that of a dust bag cleaner and therefore less easy to clean.

In order to combine the advantages of the above-mentioned bag type dust collector and cyclone type dust collector and overcome the disadvantages of the two, a liquid filtration type dust collector was produced. The liquid filtering type dust collector takes liquid as a core filtering means, captures dust, particles, allergens, pollen, dust mites, tiny microorganisms and the like through the liquid, and is assisted by a plurality of filter screens to retain the dust, the particles, the allergens, the pollen, the dust mites and the tiny microorganisms in the dust collector, so that air is discharged out of the dust collector. The liquid filtering type dust collector can recover the dust removing capacity only by replacing liquid without using any consumable material, and the suction force of the liquid filtering type dust collector cannot be gradually attenuated along with the use time. In addition, the parts of the liquid filtering type dust collector which need to be cleaned in routine maintenance are only the liquid storage box with a simple structure, so that the dust collector is easy to clean.

The dust removing capacity of the liquid filtering dust collector is mainly determined by the contact mode of liquid and gas. JPH01-314530A discloses a vacuum cleaner. When the motor fan is operated, suction gas including dust is sucked into the cylindrical liquid tank from the suction inlet outlet of the suction inlet. After the gas passes through the annular filter body, the gas is sprayed onto the liquid and rotates with the liquid. By the centrifugal force of the rotating liquid, the liquid rotates in a vortex shape, so that the center portion can be lower and the outer peripheral portion can be higher. The liquid hits the ribs and splashes out. A liquid film due to the splashed liquid is formed between the cylindrical wall and the inner peripheral wall in front of the outlet of the suction port. Among the adsorbed dust, coarse dust is blocked by the ring filter, while fine dust is completely separated from the suction gas by the liquid mainly sprayed to the outer circumferential portion when the suction gas passes through the liquid film. The above vacuum cleaner primarily achieves separation of dirt and dust from the gas by contact of the gas with a liquid film. Since the contact time between the gas and the liquid film is short and the contact area is small, the dust removal efficiency of such a contact method is not ideal.

CN1895151A discloses a dust filtering and removing device of a dust collector, which comprises a dust collecting barrel. The side wall of the dust collecting barrel is provided with an air inlet. The upper part of the dust collecting barrel is provided with an air outlet. The inner cavity of the dust collecting barrel is suitable for containing liquid and forming a dust separating chamber. And a liquid-gas separation chamber for liquid-gas separation is arranged between the dust separation chamber and the air outlet. The air outlet is communicated with the air inlet through the liquid-gas separation chamber and the dust separation chamber. The dust separating chamber is also provided with a dust separating cover. The dust separation cover is provided with a through hole. The liquid carried in the dust collecting barrel rotates at high speed along the inner wall of the dust collecting barrel, so that the dust and the garbage in the gas are dissolved in the liquid. Therefore, the main position of the contact between the gas and the liquid is on the inner wall of the dust collection barrel, and the dust collection efficiency is low.

Disclosure of Invention

As described above, it is desired to develop a filter system having high dust removal efficiency and a simple structure.

The invention discloses a grille filter for a filter system, comprising: a filter housing, an intake port and an exhaust port disposed on the filter housing, a plurality of bars disposed to extend from the intake port to the exhaust port inside the filter housing, wherein a slit disposed between each of the plurality of bars is fillable with a liquid, and the plurality of bars are sized such that gas can come into contact with the liquid in the slit during flow from the intake port to the exhaust port.

The invention also discloses a filter system for a dust collector, which comprises: a dust bin fillable with a liquid, a first air inlet passage connected to the dust bin, and a cyclone separator mounted in the dust bin, wherein the cyclone separator comprises one or more second air inlet passages extending into the dust bin and above the first air inlet passage, the bottom of the cyclone separator being sealingly connected to the bottom of the dust bin, the filtration system further comprising a grille filter as described above disposed between the first and second air inlet passages, the air inlet of the grille filter being connected to the first air inlet passage such that dirt and dust laden gas entering the dust bin via the first air inlet passage can come into contact with the liquid in the slit to attach dirt and dust in the gas to the liquid.

The invention also discloses a vacuum cleaner, which comprises a negative pressure source, the filtering system connected to the negative pressure source, and an air inlet pipe or a suction head connected to the first air inlet channel of the filtering system.

By means of the inventive grid filter, the gas is in contact with the liquid in the slits. The grid can smash bigger bubbles in the gas into less bubbles, increases the area of contact of liquid with filth and dust in the gas, has improved dust collection efficiency. Due to the pushing of the gas, the liquid flows from the gas inlet to the gas outlet in the slit, so that the resistance of the liquid to the gas is reduced. The grating filter and the filtering system comprising the grating filter have simple structures, do not need consumables and are easy to produce.

Drawings

Preferred embodiments of the invention are described below by way of example with reference to the accompanying drawings, in which:

figure 1 shows a perspective view of a grille filter for a filtration system according to the invention,

figure 2a shows a schematic cross-sectional view of the grille filter of figure 1,

figure 2b shows a schematic cross-sectional view of another embodiment of the grille filter of figure 1,

fig. 3 shows a schematic view of a filter system for a vacuum cleaner, the filter system comprising the grille filter of fig. 1,

figure 4 shows a cross-sectional view of the cyclone separator of the filtering system of figure 3,

fig. 5 shows a perspective view of the cyclone separator of fig. 4, wherein the upper cover is omitted,

FIG. 6 shows a schematic diagram of the dedusting principle of the cyclone separator in FIG. 4, an

Fig. 7 shows a schematic view of a vacuum cleaner according to an embodiment of the present invention.

Detailed Description

Fig. 1 shows a perspective view of a grille filter for a filtering system according to the present invention. The grill filter 6 includes a filter housing 8, an intake port 7 and an exhaust port 11 provided on the filter housing 8, and a plurality of grill bars 16 provided to extend from the intake port 7 to the exhaust port 11 inside the filter housing 8. The plurality of grills 16 form slits therebetween that can be filled with liquid so that gas can come into contact with the liquid in the slits during the flow from the gas inlet 7 to the gas outlet 11. The exhaust port 11 of the grill filter 6 is used to discharge the filtered gas to the outside of the grill filter 6. In the present embodiment, the grill filter 6 further includes a baffle 9 disposed near the gas inlet 7 for blocking a portion of the gas flow to prevent the gas from flowing in the opposite direction without passing through the slits. The baffle 9 is arranged so that gas flowing in the direction opposite to the slit is blocked by the baffle 9 to change direction to flow towards the slit. The grill filter 6 includes a liquid exchange port 10 provided on the filter housing 8 for fluidly communicating the slits with the outside of the grill filter 6, so that the liquid that has captured dirt and dust in the gas in the grill filter 6 can be exchanged with the liquid outside the grill filter 6 via the liquid exchange port 10, maintaining the cleaning ability of the liquid in the grill filter 6.

It should be noted that although the fluid exchange port 10 is shown in fig. 1 as being disposed at the side of the filter housing 8, the fluid exchange port 10 may be disposed at the bottom of the filter housing 8 according to an alternative embodiment of the present invention. It should be noted that although each of the plurality of grills 16 is shown in fig. 1 as extending uninterrupted from the intake opening 7 to the exhaust opening 11, according to an alternative embodiment of the present invention, at least 2/3 each of the plurality of grills 16 extends uninterrupted from the intake opening 7 to the exhaust opening 11. Furthermore, although it is shown in fig. 1 that the distance between each of the plurality of grills 16 is constant from the air inlet 7 to the air outlet 11, according to an alternative embodiment of the present invention, at least 2/3 the distance between each of the plurality of grills 16 is constant or gradually decreased from the air inlet 7 to the air outlet 11, so that the bubbles are further broken down and become smaller as the distance between the grills 16 is gradually decreased, the contact area of the gas and the liquid is increased, and the dust removal efficiency is improved.

Fig. 2a shows a cross-sectional view of the grille filter of fig. 1, and fig. 2b shows a cross-sectional view of another embodiment of the grille filter of fig. 1. The direction of flow of the gas is indicated by the arrows. The filter housing 8 is cylindrical. The plurality of grid bars 16 are arranged in the circumferential direction of the filter housing 8. The plurality of grid bars 16 may be arranged to occupy any angle in the circumferential direction of the filter housing 8. In a preferred embodiment the plurality of grate bars 16 are arranged to occupy an angle smaller than or equal to 180 °, more preferably smaller than or equal to 90 °, in the circumferential direction of the filter housing 8. The advantage of arranging the plurality of grills 16 in this way is that it is avoided that the plurality of grills 16 are too long and increase the resistance of the liquid to the gas.

Figure 3 shows a schematic view of a filter system for a vacuum cleaner. The filter system 1 includes: a dust box 2 which is cylindrical and can be filled with liquid, a first air intake passage 5 which is connected to the dust box 2; a cyclone 3 installed in the dust box 2; and an upper cover 4 covering the top of the dust box 2. The cyclonic separator 3 comprises one or more second air inlet passages 15 extending into the dust bin 2 and above the first air inlet passage 5. The filter system further includes a grill filter 6 disposed between the first intake passage 5 and the second intake passage 15.

The gas entering the dust collecting container 2 via the first gas inlet channel 5 will normally form larger bubbles, which are detrimental for dirt and dust in the gas to adhere to the liquid. As shown in fig. 3, a grill filter 6 in fluid communication with the first air intake passage 5 is provided at the bottom of the dust box 2, so that the dirt and dust laden gas entering the dust box 2 via the first air intake passage 5 is brought into contact with the liquid by means of the grill filter 6 to attach the dirt and dust in the gas to the liquid. The first air intake passage 5 is connected to the dust box 2 tangentially with respect to the outer circumference of the dust box 2, so that the flow direction of the gas in the grill filter 6 is the circumferential direction of the dust box 2, as indicated by the arrow in fig. 1. Due to the pushing of the air, the liquid rotates in the slits around the central axis of the grille filter 6 in the same direction as the air, thereby reducing the resistance of the liquid to the air and improving the suction force of the cleaner.

Fig. 4 shows a cross-sectional view of the cyclone separator of the filtering system of fig. 1. The cyclone separator 3 comprises a rotor housing having an upper diameter larger than a lower diameter. The rotor housing comprises, in order from top to bottom, a cylindrical part 12 and a frustoconical part 13. The upper diameter of the frustoconical portion 13 is greater than the lower diameter. The cyclonic separator 3 comprises a gas duct 14 extending vertically upwards from the interior of the spinner housing to a depth outside the spinner housing and connected to a source of negative pressure (not shown) for providing negative pressure. According to the present invention, the dust box 2, the cyclone 3 and the grill filter 6 are concentrically arranged, as shown in fig. 3. The advantage of providing the dust box 2, the cyclone 3 and the grill filter 6 in this way is that the inner space of the dust box 2 is efficiently utilized, and only the dust box 2 having substantially the same outer diameter and height as the cyclone 3 is required to accommodate both the cyclone 3 and the grill filter 6.

Fig. 5 shows a top view of the cyclone separator in fig. 4, with the upper cover omitted. A plurality of second air inlet channels 15 (three second air inlet channels are shown in the figure) extending tangentially outwards into the dust box 2 along the outer peripheral surface of the rotor housing and above the first air inlet channel 5 are used for introducing the gas in the dust box 2 into the cyclone separator 3. The cyclone 3 removes liquid particles contained in the dirt-and dust-removed gas in the dust container 2, so that the cleaned and dried gas is discharged from the gas duct 14 to the environment. The bottom of the cyclone 3 forms a liquid or structural seal and is located close to the bottom of the dust container 2. The liquid level filled in the dust box 2 is higher than the slit of the grill filter 6, and the bottom of the cyclone 3 is sealed by the liquid filled in the dust box 2. The principle of the cyclone 3 for removing liquid particles from a gas is described in more detail below in connection with fig. 6.

Fig. 6 shows a schematic view of the dust removal principle of the cyclone separator in fig. 4. The liquid particles in the gas entering the cyclone 3, due to their higher density compared to the gas, are thrown by centrifugal action onto the outer wall of the cyclone 3 after entering the cyclone 3 tangentially and move down a spiral path to the bottom of the cyclone 3 and accumulate at the bottom, as indicated by the solid arrows in fig. 6. In contrast, the gas is less dense and therefore collects in the centre of the cyclone 3 and is discharged to the environment via the gas duct 14, as indicated by the dashed arrows in figure 6. The bottom of the cyclone 3 is hermetically connected to the bottom of the dust box 2 so that liquid accumulated in the cyclone 3 does not flow into the dust box 2 and vice versa.

Since the liquid is not discharged through the air duct 14, the total amount of liquid in the dust box 2 and the cyclone 3 is constant. As the liquid in the cyclone 3 gradually accumulates, the liquid in the dust box 2 for attaching dirt and dust in the gas gradually becomes less. The sidewall of the dust box 2 is made of a transparent material or a translucent material, and includes a highest liquid level mark and a lowest liquid level mark on the sidewall. The maximum level mark indicates an upper limit of the amount of liquid that can be filled in the dust collection box 2, which should not be exceeded by the filling liquid. The lowest level mark indicates a lower limit of the amount of liquid in the dust container 2 which can be used for attaching dirt and dust in the gas, below which limit the amount of liquid in the dust container 2 should be replenished and the liquid accumulated in the cyclone separator 3 be discharged accordingly. The liquid in the dust box 2 is replenished and the liquid accumulated in the cyclone 3 is discharged by opening the upper cover 4 covering the top of the dust box 2.

Figure 7 shows a schematic view of a vacuum cleaner comprising a filter system according to the invention. The vacuum cleaner 20 comprises a source of underpressure 21, a filter system 1 connected to the source of underpressure 21, and an inlet pipe or suction head 22 connected to the first inlet channel 5 of the filter system 1. When the vacuum cleaner 20 is in operation, the source of negative pressure 21 generates a negative pressure, so that dirt and dust in the vicinity of the inlet conduit or cleaner head 22 is carried by the gas into the inlet conduit or cleaner head 22 and subsequently adheres to the liquid by contact with the liquid in the grill filter 6. On the other hand, the air introduced into the vacuum cleaner 20 is discharged to the outside environment through the negative pressure source 21 via the grill filter 6, the dust box 2, and the cyclone 3. For further filtering of the gas, a filter may also be arranged between the negative pressure source 21 and the filter system 1, or between the filter system 1 and the first air inlet channel 5. Types of filters include, but are not limited to, HEPA screens, liquid-vapor separation baffles, return channels, and the like.

The invention is in no way limited to the embodiments indicated in the drawings but may be varied freely within the scopes of the claims.

Claims

1. A grille filter for a filtration system comprising:

a filter housing (8),

an air inlet (7) and an air outlet (11) arranged on the filter housing (8),

a plurality of bars (16) arranged to extend inside the filter housing (8) from the air inlet (7) to the air outlet (11),

wherein slits fillable with liquid are formed between the plurality of grills (16) so that gas can come into contact with the liquid in the slits during the flow from the gas inlet (7) to the gas outlet (11).

2. The grille filter of claim 1, further comprising:

a liquid exchange port (10) provided on the filter housing (8) for fluidly communicating the slit with an exterior of the grille filter.

3. The grille filter of claim 1, wherein,

at least 2/3 each of the plurality of grills (16) extending uninterrupted from the inlet (7) to the outlet (11).

4. The grille filter of any of claims 1-3, wherein,

at least 2/3 the distance between each of the plurality of grills (16) is constant or gradually reduced from the air inlet (7) to the air outlet (11).

5. The grille filter of any of claims 1-4, wherein,

the filter housing (8) is cylindrical,

the plurality of grid bars (16) are arranged in the circumferential direction of the filter housing (8).

6. A filter system for a vacuum cleaner, comprising:

a dust collection box (2) which can be filled with liquid,

a first air inlet channel (5) connected to the dust collecting box (2), an

A cyclone separator (3) installed in the dust collection case (2),

wherein the cyclone separator (3) comprises one or more second air inlet channels (15) extending into the dust bin (2) and above the first air inlet channel (5),

the bottom of the cyclone separator (3) forms a liquid seal or a structure seal and is close to the bottom of the dust collection box (2);

the filter system further comprises a grille filter according to any one of claims 1-5 arranged between the first intake passage (5) and the second intake passage (15).

7. The filtration system of claim 6,

the liquid level of the liquid filled in the dust collection box (2) is higher than the slit of the grating filter (6), and the bottom of the cyclone separator (3) forms a seal through the liquid filled in the dust collection box (2).

8. The filtration system of claim 6,

the dust collecting box (2) is cylindrical,

the dust collecting box (2), the cyclone separator (3) and the grille filter (6) are concentrically arranged, an

The first air inlet passage (5) is connected to the dust box (2) tangentially with respect to the outer circumference of the dust box (2).

9. The filtration system of claim 6 or 7,

the cyclone separator (3) comprises a rotator shell and an air duct,

the upper diameter of the rotor housing is greater than the lower diameter, an

The air duct extends vertically upward from the interior of the rotator housing to a depth outside the rotator housing and is connected to a negative pressure source to provide negative pressure.

10. The filter system for a vacuum cleaner of claim 8,

the one or more second air inlet channels (15) extend tangentially outwards into the dust collecting bin (2) along the outer circumferential surface of the rotor housing.

11. The filtration system of any of claims 6-9,

the side wall of the dust collection box (2) is made of transparent material or semitransparent material, and the side wall comprises a highest liquid level mark and a lowest liquid level mark,

the maximum level mark indicates an upper limit of the amount of liquid that can be filled in the dust collecting container (2), an

The minimum level marker indicates a lower limit of the amount of liquid in the dust container (2) that can be used for attaching dirt and dust in the gas.

12. A vacuum cleaner comprising a source of negative pressure, a filter system according to any one of claims 6-10 connected to the source of negative pressure, and an air inlet duct or suction head connected to the first air inlet channel (5) of the filter system.