JP6082940B1 - Suction head - Google Patents

Abstract

To provide a suction head capable of allowing a cleaning liquid to penetrate into a surface to be cleaned. A suction head (40) having a suction opening (D) for suctioning a surface to be purified (W) across a boundary wall (44) and an outflow opening (S) through which cleaning liquid is guided opens at a tip thereof, and a duct (42) opened to the atmosphere. The nozzle 46 opened in the middle of the passage extending from the duct 42 to the outflow opening S, the introduction pipe 43 for supplying the cleaning liquid to the nozzle 46, and the edge 44a of the boundary wall 44 are retracted from the tip 40a. The leaked cleaning liquid is accelerated in the passage from the nozzle 46 to the outflow opening S and collides with the surface to be purified W. [Selection] Figure 1

Description

The present invention relates to a suction head used in a wet suction device that supplies a cleaning liquid to a surface to be cleaned and sucks and removes the cleaning liquid.

The wet suction device sucks water on the floor surface and dirt dissolved in the floor surface while cleaning the floor surface by spraying cleaning water on the floor surface. As such a wet suction device, for example, the one shown in Patent Document 1 is known. This device is attached to the tip of a dry suction device, for example, a suction hose of a dry vacuum cleaner, and sprays cleaning water onto the floor surface to clean the floor surface, while removing water on the floor surface and dirt dissolved therein. It is sucked and removed, and functions as a wet suction device using a motor of a dry cleaner.

In this wet suction device, a lid that covers the upper space of the sewage tank is provided with a fan that rotates with suction air and a dish that rotates with this rotational force, and the air sucked into the sewage tank from the suction head While flowing into the fan through the slit, the washing water mixed with the dirt sucked into the sewage tank is splashed off by the centrifugal force generated by the rotation of the dish.
At the tip of the suction head, a suction opening that performs a suction action on the surface to be cleaned and an outflow opening through which the cleaning liquid is guided are opened. Since the boundary that separates the suction opening and the outflow opening is slightly recessed from the tip of the suction head, when the tip of the suction head comes into contact with the surface to be cleaned, the space between the boundary and the surface to be cleaned passes through the suction opening. The cleaning liquid flows through the gap to the suction opening. At that time, the cleaning liquid dissolves dirt such as soup adhering to the surface to be purified, and is sucked into the suction opening.

JP 2014-94026 A

In the above-described wet suction device of Patent Document 1, the suction head performs purification with a cleaning liquid that flows between the boundary portion and the surface to be purified, so that the dirt adhered to the interior of the carpet is dissolved. Suction must continue until the cleaning liquid penetrates into the surface to be cleaned. In addition, the boundary is widened to increase the distance from the outflow opening to the suction opening so that the cleaning liquid permeates the inside of the surface to be purified, and this range is the exclusive purification range. However, when the suction head is brought into contact with the surface to be cleaned, the distance from the outflow opening filled with the cleaning liquid to the suction opening becomes longer, so that the pressure loss increases, and the suction force from the suction opening via the edge of the suction head increases. Leaked into the atmosphere, making it difficult for the cleaning liquid to be discharged from the outflow opening, and it took time to purify.

Accordingly, an object of the present invention is to provide a suction head capable of allowing a cleaning liquid to penetrate into the surface to be purified. Another object of the present invention is to provide a suction head that effectively discharges a cleaning liquid.

The suction head of the present invention is a suction head in which a suction opening that performs a suction action on the surface to be purified and a discharge opening that guides the cleaning liquid are opened at the front end with a boundary wall that divides the inner region of the outer cylinder into two passages In
A duct open to the atmosphere;
A blower pipe that blows out air from the duct from an outlet opening to a space reaching the outflow opening;
A nozzle that opens in the middle of the air duct;
An introduction pipe for supplying a cleaning liquid to the nozzle,
The edge of the boundary wall is retracted from the tip, the cleaning liquid leaking from the nozzle is accelerated in a passage from the nozzle to the outflow opening, and the cleaning liquid leaking from the nozzle is discharged from the outlet of the blower pipe After passing through the opening, it reaches the passage leading to the outflow opening in the inner region of the outer cylinder divided by the boundary wall, and collides with the surface to be purified.

According to the present invention, the air sucked through the duct is introduced as an air flow, and the cleaning liquid of the nozzle opened in the air flow is accelerated and collides with the surface to be cleaned. There is an effect that can penetrate into the inside of.
In addition, if a spraying mechanism is adopted, the cleaning liquid is sprayed in the form of a spray toward the outflow opening without applying a positive pressure to the cleaning tank by creating a pressure difference that draws the cleaning liquid from the nozzle using an air flow. There is an effect that can be.

It is sectional drawing of a main body container and an outflow prevention valve. It is a figure which shows the state which isolate | separated the cover body from the separation process part. It is a perspective view which shows a suction head. It is a figure explaining the effect | action of a suction head. It is a figure which shows the state which connected the connecting pipe to the dry-type vacuum cleaner. It is a figure which shows the other Example of a suction head. It is a figure which shows the further another example of a suction head.

In FIG. 1, the wet suction device 100 is provided with a sewage tank 1, a cleaning liquid tank 2, and a separation processing unit 5 in a main body container 110. Outside the main body container 110, a connecting pipe 6, an extension pipe 13 connected to the suction head 40, and a coupling end 33 connected to an air hose of a dry cleaner are provided.

In the main body container 110, the sewage tank 1 is disposed on the upper side, and the cleaning liquid tank 2 is disposed on the lower side. The sewage tank 1 has a circular horizontal cross section, and has a circular bottom surface portion 1b and a conical peripheral surface portion 1a whose radius increases from the bottom surface portion 1b upward, along the upper edge of the peripheral surface portion 1a. The upper space is covered by a lid 1c that seals the internal space of the sewage tank 1.

The bottom surface portion 1b is formed by a partition plate 7 that partitions the internal volume of the main body container 110 up and down. A separation processing unit 5 is incorporated in the lid 1c, and is fixed to the main body container 110 so as to be detachable from the sewage tank 1 via a plurality of (for example, four) locking portions 8.

FIG. 2 shows a state where the lid 1c is removed from the main body container 110. FIG. Each of the locking portions 8 includes a tongue piece 8a that is swingably operated, and a hook-shaped protrusion 8b that is hooked into the locking hole a1 of the tongue piece 8a.

The separation processing unit 5 provided on the lid 1c sorts out air from the cleaning liquid sucked together with air into the sewage tank 1 through the suction head 40, dirt and dust contained in the cleaning liquid, and flows out toward the outlet pipe 19 Let The separation processing unit 5 performs air-water separation for separating gas and liquid, and includes a plate body 9a, a fan 9b rotated by an air flow, and a shaft portion 9c that transmits the rotation of the fan 9b to the plate body 9a. ing. The dish body 9a has a large number of slanted slits b2 formed on the peripheral surface. By rotating, the dish body 9a stops entering water into the dish body 9a and allows air to flow into the inside through the slit b2. The air flowing inward flows into the fan 9b, and is sucked through the outlet pipe 19 by rotating the fan 9b.

A cleaning liquid tank 2 is disposed below the sewage tank 1. The cleaning liquid tank 2 has a peripheral surface portion 2 a and a bottom surface portion 2 b, and the top surface portion 2 c shares a partition plate 7 constituting the bottom surface portion 1 b of the sewage tank 1. The peripheral surface portion 2a is provided with a cleaning liquid receiving part 10, and the cleaning liquid receiving part 10 includes a cleaning liquid supply pipe 10a and a lid 10b that closes an opening at the upper end of the cleaning liquid supply pipe 10a. The cleaning liquid supply pipe 10a opens the lower end opening c1 into the peripheral surface portion 2a and is set higher than the top surface portion 2c. The lid body 10b is formed with an air vent hole for air in and out of the cleaning liquid tank 2 to be opened, and is opened when supplying cleaning liquid such as water into the cleaning liquid tank 2. Therefore, the inside of the cleaning liquid tank 2 is in an atmospheric pressure state.

In FIG. 1, the extension pipe 13 has a rear end opened to the inside of the sewage tank 1 via a nozzle 23 via the peripheral surface portion 1 a. The opening d1 of the nozzle 23 has an opening area smaller than the cross-sectional area d2 through which air passes in the extension pipe 13, and the inflow speed into the sewage tank 1 is increased. Furthermore, the opening d1 of the nozzle 23 opens the air flow from the extension pipe 13 in the circumferential direction along the peripheral surface portion 1a (see FIG. 1B). The outer side of the nozzle 23 is a guide wall 23a that draws a continuous curve with the peripheral surface portion 1a, and the sewage turning inside the sewage tank 1 gets over the guide wall 23a and turns.

The extension pipe 13 is obliquely extended forward and slightly downward from the sewage tank 1, and a suction head 40 is connected to the tip thereof. The suction head 40 includes a mouth tube 3a to be inserted into the extension tube 13, and a passage portion 3b whose internal space is gradually expanded laterally from the mouth tube 3a to the front.

A cleaning liquid passage 15 is provided between the cleaning liquid tank 2 and the suction head 40. When the pressure inside the suction head 40 becomes negative, the cleaning liquid flows from the cleaning liquid tank 2 at atmospheric pressure toward the suction head 40 in the cleaning liquid passage 15. The suction head 40 includes a flow rate adjusting unit 16 in the middle of its length. The flow rate adjusting unit 16 is configured to elastically deform a portion along the length of the cleaning liquid passage 15 into a flat shape, and includes a handle 16a. When the handle 16a is swung around the support shaft 17, the cleaning liquid passage 15 is sandwiched between the handle 16a and the extension pipe 13, and elastically deforms to close the cleaning liquid.

FIG. 3 shows the suction head 40. FIG. 3A shows the suction head viewed from obliquely below. The tip 40a of the suction head 40 is shaped like a cylinder cut obliquely. The suction head 40 includes an outer cylinder 41 and a cylindrical boundary wall 44 disposed inside the outer cylinder 41. The boundary wall 44 is a boundary that divides the inner region of the outer cylinder 41 into two passages, and one of the passages is connected to the mouth tube 3a (FIG. 1) and is connected to the suction opening D. The other passage is connected from the duct 42 to the suction opening D.

An introduction pipe 43 for introducing the cleaning liquid from the cleaning liquid passage 15 into the internal space of the boundary wall 44 and a duct 42 are provided. The outer cylinder 41 is connected to the mouth tube 3a at the base end 40b, and the inner space is sucked. The boundary wall 44 extends to the base end 40b side, but is connected to the duct 42 in the middle. The duct 42 passes through the outer cylinder 41 and opens the internal space of the cylindrical boundary wall 44 to the atmosphere.

At the tip 40a of the suction head 40, the suction opening D defined by the edge 41a of the boundary wall 44 and the edge 44a of the boundary wall 44 and the outflow opening S defined by the edge 44a of the boundary wall 44 are adjacent to each other. It is open. FIG. 3B shows the positional relationship between the suction opening D and the outflow opening S by extracting only the tip 40 a of the suction head 40. The edge 44a forms the boundary between the suction opening D and the outflow opening S over the entire area.

The edge 41a is almost entirely in contact with the surface to be purified when the tip 40a of the suction head 40 is pressed against the planar surface to be purified, but the front side (pointed side) 41b and the rear side of the tip 40a (pointed side) In the range of 41c (opposite side of the front side 41b), it is slightly retracted from the tip 40a so as to be away from the surface to be purified. This is to make it easier to take the solid material into the suction opening D.

On the other hand, when the edge 41a is in contact with the surface to be cleaned almost entirely in contact with the surface to be cleaned, the edge 44a is slightly retracted away from the surface to be cleaned. Since the edge 44a constitutes the boundary between the suction opening D and the outflow opening S, the distance between the surface to be purified and the edge 44a becomes a passage for sucking suction air. In the range of the front side (pointed side) 44b and the rear side (opposite side of the front side 44b) 44c of the tip 40a, the shape of the boundary wall 44 that is separated from the edge 41a and continues from the edge 44a to the duct 42 is also provided. In a similar manner, the distance from the inner peripheral surface of the outer cylinder 41 is greater than that of other portions. This is because the solid matter taken into the suction opening D easily passes through the suction head 40.

FIG. 3C shows a state where only the outer cylinder 41 is removed from the suction head 40. The boundary wall 44 is fixed to the outer cylinder 41 by a support block 47. The support block 47 is located on the side surface side of the suction head 40. This is because there is no problem when the suction head 40 is moved back and forth with respect to the surface to be cleaned during cleaning. The support block 47 further continues toward the duct 42 and contacts the side surface of the nozzle 46 continuing from the introduction pipe 43. This is to prevent the filaments sucked into the suction opening D from being caught by the nozzle 46. It is further desirable if the nozzle 46 penetrates the support block 47. The surface 47a of the support block 47 on the tip 40a side of the suction head 40 has a slope that makes the step between the edge 41a and the edge 44a continuous.

FIG. 3D shows a state in which a part of the boundary wall 44 is deleted. Inside the boundary wall 44, the blower pipe 45 and the tip opening 46a of the nozzle 46 constitute a spray mechanism 50a that uses pressure due to a change in the flow velocity of the air flow t. When the internal air of the boundary wall 44 is sucked into the suction opening D through the space between the edge 44a and the surface to be purified, the air is replenished from the atmosphere through the duct. A blower pipe 45 is provided in the middle of the passage from the duct 42 to the outflow opening S. The air sucked from the duct 42 is introduced as an air flow t into the boundary wall 44 through the blower pipe 45. The nozzle 46 is disposed to face the outlet opening of the blower tube 45 so that the tip opening 46a is positioned in the air flow t. An acceleration passage AC through which the air flow t moves is provided from the tip opening 46a to the edge 44a of the boundary wall 44. In the range of the acceleration passage AC, the cleaning liquid is accelerated by the air flow t.

FIG. 4 shows the operating principle of the suction head 40. 4A is a side cross-sectional view, and FIG. 4B is a plan cross-sectional view showing only the nozzle 46 and the blower pipe 45 in an enlarged manner. The surface to be cleaned W is indicated by a one-dot broken line. The nozzle 46 has a tip opening 46a arranged with respect to the air flow t introduced by the blower tube 45. As shown in FIG. 4B, the tip opening 46a of the nozzle 46 is inside the air flow t. In the atomizing mechanism 50a constituted by the blower tube 45 and the tip opening 46a, the air flow t is blocked by the wall surface of the nozzle 46 to change its direction, and a pressure difference is generated, and the cleaning liquid is sucked out from the tip opening 46a. . The sucked cleaning liquid is accelerated by the air flow t while slightly diffusing in a conical shape and collides with the surface to be cleaned W in the range of the outflow opening S (injection of cleaning liquid).

As a result, the cleaning liquid enters the inside of the surface to be cleaned W in the range of the outflow opening S with respect to the surface to be cleaned such as the carpet surface. The air flow t is sucked into the suction opening D via the inner surface of the surface to be cleaned W and the edge 44a or when the surface to be cleaned W is a carpet surface.

Since the cleaning liquid ejected from the nozzle 46 collides with the surface to be purified W in the range of the outflow opening S in an accelerated state, the range of the outflow opening S becomes the cleaning range by the cleaning liquid. As a result, the distance from the outflow opening S to the suction opening D is increased, and according to this example , the distance from the outflow opening S to the suction opening D is compared with Patent Document 1 in which this range is the exclusive purification range. th (or the thickness th of the edge 44a) may be thin. Therefore, since the pressure loss at the edge 44a when the suction head 40 is pressed against the surface to be cleaned W is small, the amount of air sucked from the duct 42 increases, and a high-speed air flow t can be created. This contributes to ejecting more cleaning liquid from the nozzle 46.

Returning to FIG. 1, the connecting pipe 6 is fixed to the rear side of the sewage tank 1 in a standing posture. In this example, it is fixed to the sewage tank 1 via the holding member 18a, while the holding member 18b is disposed in a state of straddling the cleaning liquid tank 2, and is formed in a bridge-like manner by both holding members so as to be vertically oriented. A connecting pipe 6 having a path is fixed to the main body container 110. The connecting pipe 6 is a part having a function of being gripped by the operator's hand as will be described later. A socket 20 to be inserted in a state where the outlet pipe 19 can be inserted into and removed from the pipe line inside the connection pipe 6 is fitted to the upper end of the connection pipe 6. And the lower end of the pipe line inside the connecting pipe 6 is bent 90 degrees in the horizontal direction. The pipe line of the connecting pipe 6 continues through a portion called the outflow prevention valve 30, continues to the coupling end 33, and is connected to the air hose h of the electric vacuum cleaner 101 through the coupling end 33. A pipe line in the outflow prevention valve 30 is referred to as a valve chamber 31. The internal space of the valve chamber 31 extends in the horizontal direction, and a spherical valve body 34 and a valve body that forms a downward dent from the tube wall surface of the valve chamber 31 in a state where the wet suction device 100 stands. The parking part 32, the opening part 35 opened to the coupling end 33 side, and the ring-shaped packing 36 provided around the opening part 35 are provided. The connecting pipe 6 is provided between the cleaning liquid tank 2 and the separation processing unit 5 and separated from the main body container 110. This position is a position corresponding to the horizontal side of the center of gravity of the main body container 110 in which the cleaning liquid tank 2 is filled with the cleaning liquid and the lid 1c is mounted.

Next, a usage example of the wet suction device 100 of the present example formed as described above will be described.
In a state where the flow rate adjusting unit 16 is closed, the lid 10b of the cleaning liquid receiving unit 10 is opened to supply a cleaning liquid (either liquid medicine or water) into the cleaning liquid tank 2, and then the lid 10b is closed.
As shown to FIG. 5A, the front-end | tip opening of the air hose h of the vacuum cleaner 101 which is a dry-type vacuum cleaner is externally fitted to the connection end 33, and is connected. The operator operates the switch k of the vacuum cleaner 101 to start it. The cleaning liquid tank 2 is in an atmospheric pressure state, and the pipe friction loss and the surface tension in the cleaning liquid passage 15 act on the dead weight of the cleaning liquid, and is balanced with respect to the atmospheric pressure. The cleaning liquid overflows from the nozzle 46. There is nothing. The connection pipe 6 is gripped by the hand j, and the tip 40a of the suction head 40 is brought into contact with the surface to be cleaned such as carpet.

The negative pressure generator of the started vacuum cleaner 101 sucks air through the outlet pipe 19, the dish body 9 a, the sewage tank 1, and the suction head 40. When cleaning with the cleaning liquid is performed, if the cleaning liquid passage 15 is opened by operating the handle 16a, an air flow from the duct 42 to the outflow opening S is generated, the pressure balance in the nozzle 46 is lost, and the cleaning liquid is covered. Injected onto the purification surface. The cleaning liquid dissolves dirt adhering to the surface to be cleaned or penetrating inside.

The cleaning liquid present on the surface to be purified, the dirt components mixed therewith, the scattered dust and the like flow into the dirty water tank 1 through the suction head 40. The nozzle 23 flows in the circumferential direction along the peripheral surface portion 1a in a state where the flow velocity is increased. Further, as the dish body 9a rotates, a swirling flow around the center line of the sewage tank 1 is generated. Centrifugal separation is performed in the sewage tank 1, and the separated sewage descends in the cleaning liquid tank 2. The dish body 9 a prevents the entry into the outlet pipe 19 by splashing the sewage to flow down into the outlet pipe 19 through the slit b <b> 2 by centrifugal force due to rotation. The air flow in the outlet pipe 19 reaches the vacuum cleaner 101 through the connecting pipe 6 and the coupling end 33.

When the handle 16a is operated to close the cleaning liquid passage 15, the supply of the cleaning liquid is stopped. If the vacuum cleaner 101 is continuously started as it is, the suction head 40 continues to suck the cleaning liquid present on the surface to be cleaned through the suction opening D, and dries the surface to be cleaned.

When sewage accumulates in the sewage tank 1 to a required discharge level, the locking of the main body container 110 and the lid 1c by the locking portions 8 is released as shown in FIG. Then, the sewage accumulated in the sewage tank 1 is discarded.
In this example, the air hose h of the vacuum cleaner 101 is connected to the lower side of the connecting pipe 6 to prevent the air hose h from interfering with the movement of the hand.

The sewage tank 1 is disposed above the cleaning liquid tank 2. Since the sewage tank 1 has the dish body 9 a inside, the sewage tank 1 needs to be deeper than the cleaning liquid tank 2. Since the heavy weight of the cleaning liquid and sewage is located below the connection pipe 6 and the separation processing unit 5 is set on the upper side, the position of the center of gravity is near the connection pipe 6 and the wet suction device 100 can be easily handled.

Further, since the height does not change greatly even if the cleaning liquid tank 2 is moved to the sewage tank 1 or the center of gravity rises, the handling property is not deteriorated. If the cleaning liquid tank 2 is on the sewage tank 1, the center of gravity is on the upper side of the connecting pipe 6 at the beginning of cleaning, and therefore it becomes difficult to handle. In addition, the moving height of the cleaning liquid that moves during cleaning also increases, and the variation in the center of gravity increases.

By arranging the sewage tank 1 on the upper side, the suction air from the vacuum cleaner 101 must be introduced into the separation processing unit 5 provided on the lid 1c of the sewage tank 1, but the connecting pipe 6 It plays this role. The thickness of the pipe that handles the air volume of the normal vacuum cleaner 101 is almost the thickness that can be grasped by the palm, and the suction air of the electric vacuum cleaner 101 introduced from the lower position that does not interfere with the wet suction device 100 is connected to the connection pipe. 6 is sent to the separation processing unit 5 using the inside.
FIG. 5B shows a state in which the suction head 40 is not directly attached to the extension pipe 13 of the wet suction device 100 but is attached with the flexible hose m interposed therebetween. As the cleaning liquid passage 15, a sufficiently long one is used. Cleaning is performed by holding the suction head 40 in the hand j, and the wet suction device 100 is placed on the floor or in an appropriate place. If the flexible hose m is interposed, it can be used even in an environment where the vertical relationship between the separation processing unit 5 and the sewage tank 1 is reversed, such as a vertical wall surface or a ceiling surface. Further, even if the wet suction device 100 falls during the operation, the outflow prevention valve 30 prevents the cleaning liquid from flowing into the negative pressure generating portion of the dry vacuum cleaner 101.

According to this example , since the cleaning liquid tank 2 can spray the cleaning liquid from the suction head 40 in a sprayed state even in an atmospheric pressure state, a pump for pumping the cleaning liquid is not necessary. Therefore, since it is not necessary to equip the wet suction apparatus 100 with an electric device such as a motor, it is possible to obtain a product with few laws and regulations to be dealt with and regulations in the exporting country when selling and exporting the product.

FIG. 6 is a cross-sectional view illustrating a suction head 400 according to an embodiment of the present invention . The same components as those of the suction head 40 are denoted by the same reference numerals. Although various forms are known about the spray mechanism that sucks out the liquid using the pressure difference of the air flow, this embodiment uses the spray mechanism of the suction head 40 using another spray structure 50b. is there. The spray structure 50 b is provided with a portion 45 a where the pipe line is narrowed in the middle of the blower pipe 45, and the tip opening 46 a of the nozzle 46 is disposed. Compared with the suction head 40, the point is arranged with respect to the air flow t. However, as shown in FIG. 6B, the tip opening 46a of the nozzle 46 is a side surface rather than the inside of the air flow t. The air flow t has a higher flow velocity at the position 45a, and the resulting pressure drop causes the cleaning liquid to be sucked out from the tip opening 46a based on the principle of spraying.

Figure 7 is a sectional view showing a Aspirate head 500. The same components as those of the suction head 40 are denoted by the same reference numerals. In this example , the configurations of the suction opening D and the outflow opening S are changed. The suction opening D is disposed on the front side of the front end of the suction head 500 and the outflow opening S is disposed on the rear side of the suction opening D. The suction head 500 has an appearance composed of an outer cylinder 501, and an edge 501 a surrounds the outflow opening S and the suction opening D to define the periphery thereof, and the boundary wall 502 is defined by the outer cylinder 501. Is divided into two passages, one of which is connected to the mouth tube 3a (FIG. 1) and connected to the suction opening D. The other passage is connected from the duct 42 to the suction opening D. An edge 502a of the boundary wall 502 defines a boundary between the outflow opening S and the suction opening D. When the tip of the suction head 500 comes into contact with the surface to be purified W, almost the entire area of the edge 501a comes into contact with the surface to be purified W. On the other hand, the edge 502a of the boundary wall 502 recedes from the edge 501a of the outer cylinder 501, and when the tip of the suction head 500 comes into contact with the surface to be purified W, the edge 502a of the boundary portion 502 and the surface to be purified There is a gap between W. In addition, the front end side of the suction head 500 is provided with a portion 501b that is slightly retracted in order to make it easy to take in the solid matter.

The duct 42 sucks outside air from the rear side of the suction head 500, forms an air flow t through the blower pipe 45, and the tip opening 46 a of the nozzle 46 is looking inside the air flow t. The atomizing mechanism 50 a that ejects the cleaning liquid is the same as the suction head 40. A space formed between the outer cylinder 501 and the boundary wall 502 extending from the tip opening 46a to the surface to be purified W functions as an acceleration passage through which the jetted cleaning liquid is accelerated. Also in this example , since the cleaning liquid is sprayed onto the surface to be cleaned W, the thickness th of the edge 502a of the boundary wall 502 may be thin.

In the above example , the cleaning liquid tank 2 is in an atmospheric pressure state, and the cleaning liquid is sucked out into the air flow t using the nozzle 46 and the spraying mechanisms 50a and 50b using the air flow t. On the other hand, if it is the structure which does not provide the spraying mechanism 50a, 50b, the suction by the principle of spraying cannot be expected. Even in this case, if, for example, a positive pressure is applied to the cleaning liquid in the cleaning liquid tank 2 to leak from the nozzle 46, the cleaning liquid leaking from the nozzle 46 is accelerated by the air flow t through the acceleration passage. Then, it collides with the surface to be purified W and penetrates into the inside.

DESCRIPTION OF SYMBOLS 1 Sewage tank 1c Cover body 2 Cleaning liquid tank 4 Cleaning liquid guide path 5 Separation processing part 6 Connection pipe 30 Outflow prevention valve 31 Valve chamber 32 Valve body parking part 33 Connection end 34 Valve body 35 Opening part 36 Packing 40 Suction head 41 Outer cylinder 42 Duct 43 Introduction pipe 44 Boundary wall 45 Blow pipe 46 Nozzle 47 Support block 100 Wet suction device 101 Vacuum cleaner 110 Main body container 400 Suction head 500 Suction head 501 Outer cylinder 502 Boundary wall

Claims (2)

In the suction head in which the suction opening that performs the suction action on the surface to be purified and the outflow opening that guides the cleaning liquid are opened at the front end through a boundary wall that divides the inner region of the outer cylinder into two passages ,
A duct open to the atmosphere;
A blower pipe that blows out air from the duct from an outlet opening to a space reaching the outflow opening;
A nozzle that opens in the middle of the air duct;
An introduction pipe for supplying a cleaning liquid to the nozzle,
The edge of the boundary wall is retracted from the tip, the cleaning liquid leaking from the nozzle is accelerated in a passage from the nozzle to the outflow opening, and the cleaning liquid leaking from the nozzle is discharged from the outlet of the blower pipe After passing through the opening, the suction head is characterized in that it reaches a passage leading to the outflow opening in the inner region of the outer cylinder divided by the boundary wall and collides with the surface to be purified. The suction head according to claim 1, further comprising a mist blowing mechanism that generates a pressure difference in the middle of an air flow flowing through a passage from the duct to the outflow opening and sucks the cleaning liquid from the nozzle by the pressure difference.