JP2006218186A - Wet vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wet vacuum cleaner which can fully secure the spraying time of a cleaning liquid for removing staining even if the volume of the cleaning liquid is less and is excellent in a cleaning effect. <P>SOLUTION: The wet vacuum cleaner is equipped with an injection nozzle 51 which injects the cleaning liquid W to a material to be washed, a suction nozzle 11 which sucks the staining and moisture with air, a liquid sending pump 40 which discharges to the injection nozzle 11 the cleaning liquid W stored in a liquid supply tank 57, a suction hose 12 which conducts an interflow A of the staining, the moisture, and the air sucked from the suction nozzle 11, an electric fan 15 which generates suction force in the suction nozzle 11 by sucking and discharging air, and a sewage tank 14 which stores the staining and moisture (sewage B)separated from the interflow A. The liquid sending pump 40 is controlled so that the cleaning liquid is continuously and intermittently injected from the injection nozzle 51 by continuously and intermittently discharging the cleaning liquid W from the liquid supply tank 57 to the injection nozzle 51. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wet type vacuum cleaner that sucks dirt on an object to be cleaned together with moisture and air.

  Conventionally, a wet type vacuum cleaner that sucks dirt on an object to be cleaned together with moisture and air while jetting cleaning liquid from the injection nozzle inside the suction nozzle to the object to be cleaned has been used mainly for business use (the following patents) References 1 and 2).

JP 2000-31658 A JP 2001-245952 A

However, Patent Documents 1 and 2 do not disclose a technique for optimizing an operation mechanism in a wet vacuum cleaner having a compact design particularly suitable for home use.
That is, in a wet vacuum cleaner with a compact design, the amount of cleaning liquid that can be used decreases with the miniaturization of the liquid supply tank (cleaning liquid storage tank). Therefore, as in the prior art, when a certain amount of cleaning liquid is continuously sprayed from the start of spraying to the end of spraying, there is a problem that the cleaning liquid is used up in a short time before the dirt is completely removed. That is, there is a problem in that it is not possible to ensure the cleaning liquid spray time required to remove the dirt to a satisfactory level.

  Accordingly, an object of the present invention is to provide a wet type vacuum cleaner that can secure the spraying time of the cleaning liquid required to remove dirt and is excellent in cleaning effect.

  The present invention includes an injection nozzle for injecting a cleaning liquid onto an object to be cleaned, a suction nozzle for sucking dirt and moisture together with air, a liquid feed pump for sending the cleaning liquid stored in a liquid supply tank to the injection nozzle, and the suction Dirt sucked from the nozzle, a suction hose that conducts a mixed flow of moisture and air, an electric fan that generates suction force at the suction nozzle by sucking and discharging air, and dirt separated from the mixed flow And a sewage tank for storing water, wherein the liquid feed pump continuously and intermittently sends the cleaning liquid from the liquid supply tank to the spray nozzle, thereby The above object is achieved by providing a wet type vacuum cleaner that is controlled to continuously and intermittently inject cleaning liquid from a nozzle.

In the present invention, the continuous injection of the cleaning liquid means that a certain amount of the cleaning liquid is injected for a certain period of time, and the intermittent injection of the cleaning liquid means that the cleaning liquid is injected at all times. This means a state in which time periods are not mixed, a state in which a certain amount of cleaning liquid is always ejected, a state in which the amount of ejection varies depending on the time period, and a state in which they are combined.
For example, when an amount of cleaning liquid of 100 is jetted in a certain time zone, and an amount of cleaning liquid of 50 or less is jetted in a time zone following the time zone, this corresponds to intermittent jetting. Note that the number of revolutions of the liquid feeding motor may be reduced in order to reduce the amount of cleaning liquid sprayed. Also, the liquid feed motor rotates intermittently when the time period during which the liquid feed motor rotates and the time period when the liquid feed motor is mixed are mixed. It means a state that fluctuates according to, and a state in which they are combined. In particular, in the case of a home-use wet vacuum cleaner, there is little need to consider the removal of special dirt required for a commercial wet-type vacuum cleaner. Therefore, by adopting continuous injection and intermittent injection of the cleaning liquid in the wet vacuum cleaner, it is possible to secure a cleaning time for removing the dirt.

  According to the wet type vacuum cleaner of the present invention, even when the amount of the cleaning liquid that can be used decreases with the miniaturization of the liquid supply tank, it is possible to ensure the spraying time of the cleaning liquid for removing dirt, and the cleaning effect Excellent.

Hereinafter, a preferred embodiment of the wet type vacuum cleaner of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the wet type vacuum cleaner 1 according to the present embodiment sucks the spray nozzle 51 that sprays the cleaning liquid W onto the object to be cleaned, and dirt and moisture (water is derived from the cleaning liquid) together with air. The suction nozzle 11, the liquid feed pump 40 for sending the cleaning liquid W stored in the liquid supply tank 57 to the spray nozzle 51, and the suction hose for conducting the mixed flow A of dirt, moisture and air sucked from the suction nozzle 11. 12, an electric fan 15 that generates suction force in the suction nozzle 11 by sucking and discharging air, and a sewage tank 14 that stores dirt and moisture (sewage B) separated from the mixed flow A. Yes.

The wet vacuum cleaner 1 of this embodiment will be described in further detail. First, the structure will be described, and then the control (operation mechanism) will be described.
As shown in FIG. 3, the suction nozzle 11 is a hollow body having a divergent shape toward the distal end portion 11 </ b> C. The tip portion 11C is open and serves as a contact surface with the object to be cleaned. The rear end portion is also opened and serves as a connecting portion (hose connecting portion 79) with the suction hose 12.
1-3, the suction nozzle 11 is divided into a front portion 11A on the front end portion 11C side and a rear portion 11B on the suction hose 12 side, and a cylindrical rear end fitting portion 64 in the front portion 11A. The front part 11A and the rear part 11B are connected to each other by fitting a cylindrical front end fitting part 72 in the rear part 11B inside.

First, the front portion 11A will be described in detail.
The front portion 11A is a portion of the suction nozzle 11 on the front end portion 11C side, and, as shown in FIG. 3, the front body 63 having a wide shape communicating with the rear end fitting portion 64 and the front end body 63 from the rear end fitting portion 64. A pair of hollow expanding portions 66 that expand toward the front end, and the entire shape thereof extends from the rear end fitting portion 64 toward the front end portion 61.

As shown in FIG. 3, the front end portion 61 of the front portion 11A is provided with a soft member 62 over the entire circumference.
As shown in FIG. 3, a plurality of bundles of brushes 67 are provided on the inner side of the soft member 62 at predetermined intervals along the inner peripheral surface thereof.
As shown in FIG. 3, the front main body 63 is a cylindrical portion having a wide, substantially rectangular cross section, and a soft member 62 is provided on the front end portion 61 side, and on the rear portion 11B side, A rear end fitting portion 64 and a hollow widening portion 66 are provided.

As shown in FIG. 3, the rear end fitting portion 64 is a cylindrical portion having a circular cross section provided on the rear portion 11B side of the front main body 63, and on the inside thereof, the front end fitting portion 72 of the rear portion 11B. Are adapted to be fitted.
As shown in FIG. 3, a pair of hollow expanding portions 66 and 66 are provided on both side portions of the rear end fitting portion 64. The hollow expanding portion 66 has a substantially semicircular arc-shaped hollow cross section, and communicates with both sides of the rear end fitting portion 64 and a portion connected to the front main body 63. The pair of hollow expanding portions 66 are provided so as to be arranged at positions corresponding to a pair of flow notches 74 (described later) of the rear portion 11B in a fitted state between the front portion 11A and the rear portion 11B. Yes.

  As shown in FIG. 3, a piston notch 65 is provided on the upper portion of the rear end fitting portion 64 of the front portion 11A. The piston notch 65 has a substantially semicircular shape that is concave from the rear part 11B side toward the tip part 61 in plan view. As shown in FIG. 3, a cylindrical guide convex body 75 (described later) of the rear portion 11B is fitted into the piston notch portion 65 in a fitted state between the front portion 11A and the rear portion 11B. Yes.

Next, the rear part 11B will be described in detail.
As shown in FIGS. 1 and 3, the rear part 11 </ b> B is a part connected to the suction hose 12 in the suction nozzle 11. As shown in FIG. 3, the rear part 11 </ b> B is mainly configured by a rear main body 73 bent in a side view. As shown in FIGS. 3 to 5, the injection nozzle 51 is disposed inside the rear portion 11 </ b> B, and a shielding plate 53 is further provided between the front end portion 71 of the rear portion 11 </ b> B and the injection port 51 </ b> A of the injection nozzle 51. Is provided.

As shown in FIGS. 1 to 3, the injection nozzle 51 is connected to the liquid supply tube 52 via the bent conduit 54 and the tube connection portion 55, and the cleaning liquid W supplied from the liquid supply tube 52 is supplied to the injection nozzle 51. The spray can be ejected from the ejection port 51A toward the object to be cleaned.
The spray nozzle 51 can spray (spray) radially or spray the cleaning liquid in a straight line by exchanging the spray ports 51A.

As shown in FIGS. 3 to 5, the shielding plate 53 is a crank-shaped member in a side view, and a conduction portion 53 </ b> A is provided at the center of the lower plate-shaped portion facing the injection nozzle 51. . The other end of the shielding plate 53 is a rod-like portion 53B that passes through a shaft portion through hole 77 provided on the upper wall surface of the rear portion 11B. A coil spring 78 is provided around the rod-shaped portion 53B.
The shielding plate 53 brings the suction nozzle 11 into contact with the object to be cleaned while the electric fan 15 is operating, and is lowered to a predetermined position only while the inside of the suction nozzle 11 is in a negative pressure state. As will be described later, the cleaning liquid W sprayed from the spray nozzle 51 can reach the object to be cleaned. Further, the shielding plate 53 shields the cleaning liquid W sprayed from the spray nozzle 51 by the action of the coil spring 78 as will be described later when the suction nozzle 11 is separated from the object to be cleaned.

A piston 76 connected to the shielding plate 53 and a guide convex body 75 for guiding the piston 76 are provided on the upper portion of the front end fitting portion 72 of the rear portion 11B.
The piston 76 is connected to the head of the rod-shaped portion 53B of the shielding plate 53, and is accommodated in a guide convex body 75 that serves as a piston guide.
As shown in FIGS. 3 and 5, a pair of flow notches 74 for flowing the cleaning liquid are provided on both sides of the front end fitting portion 72 of the rear portion 11 </ b> B. The pair of flow cutouts 74 are substantially semicircular in a concave shape toward the hose connection part 79 in a side view.

As shown in FIGS. 1 and 3, the hose connecting portion 79 of the rear portion 11 </ b> B is a portion that fits with one end portion 12 </ b> A of the suction hose 12.
As shown in FIG. 5, a tube connection portion 55 that is a connection portion with the liquid feeding tube 52 is disposed below the rear portion 11B. Further, a bent conduit 54 that communicates the tube connecting portion 55 and the injection nozzle 51 is provided so as to penetrate the lower outer periphery of the rear portion 11B.

  As shown in FIG. 3, the front part 11 </ b> A and the rear part 11 </ b> B are connected by fitting the front end fitting part 72 to the rear end fitting part 64 to constitute the suction nozzle 11. Therefore, the shape of the tip portion 11C of the suction nozzle 11 can be changed by replacing the front portion 11A with a different shape.

  When the front part 11A and the rear part 11B are connected, as shown in FIG. 3, the guide convex body 75 that guides the piston 76 in the rear part 11B is an upper part of the rear end fitting part 64 of the front part 11A. The hollow portions of the pair of hollow expanding portions 66 in the front portion 11A are fitted to the piston notches 65 formed in the front portion 11A, and a pair of flow notches 74 formed on both sides of the front end fitting portion 72 of the rear portion 11B. Are arranged corresponding to each.

The positional relationship between the spray nozzle 51 and the shielding plate 53 will be described.
When the electric fan 15 is not operating, as shown in FIGS. 4A and 5A, the lower plate-like portion of the shielding plate 53 is opposed to the injection port 51 </ b> A by the action of the coil spring 78. It is in the position to do.
When the electric fan 15 is activated and the suction nozzle 11 is brought into contact with the object to be cleaned, the inside of the suction nozzle 11 is in a negative pressure state, so that the shielding plate 53 is pulled downward, and FIGS. As shown in (b), the injection port 51A of the injection nozzle 51 and the conduction portion 53A of the shielding plate 53 are overlapped. Therefore, the cleaning liquid W ejected from the ejection port 51A reaches the object to be cleaned through the conduction portion 53A.

  On the other hand, even when the electric fan 15 is in operation, when the suction nozzle 11 is separated from the surface to be cleaned, the negative pressure in the suction nozzle 11 is released and becomes a normal pressure. Due to the urging force, the shielding plate 53 is pulled upward, and again, as shown in FIGS. 4 (a) and 5 (a), the lower plate-like portion of the shielding plate 53 is in a position facing the injection port 51A. Return. Therefore, even if the cleaning liquid W is being sprayed, the cleaning liquid W will not scatter from the suction nozzle 11 unless the suction nozzle 11 is brought into contact with the surface to be cleaned.

Next, the suction hose 12, the sewage tank 14, the electric fan 15, the liquid feed pump 40, the liquid supply tank 57, etc. will be described.
As shown in FIGS. 1 and 2, the suction hose 12 is a hose that connects the suction nozzle 11 and the sewage tank 14, and a mixed flow A of dirt, moisture, and air sucked from the suction nozzle 11 is passed through the sewage tank 14. It conducts inside.

As shown in FIGS. 1 to 3, one end portion 12 </ b> A of the suction hose 12 is fitted to the hose connecting portion 79 of the rear portion 11 </ b> B and communicates with the inside of the suction nozzle 11, and the other end portion 12 </ b> B is It is fitted in the inlet 14 </ b> A at the top of the sewage tank 14.
As the suction hose 12, a suction hose conventionally used for a wet vacuum cleaner can be used without particular limitation. For example, a bellows-like hose, a bellows-like outside and a smooth tubular hose inside, Examples thereof include a tubular hose. In the wet type vacuum cleaner 1 of the present embodiment, a hose having a bellows-like outer side and a smooth tubular inner side is used from the viewpoint of preventing adhesion of sewage on the inner surface of the hose while ensuring ease of bending of the hose.

  The sewage tank 14 is a tank that stores dirt and moisture (sewage B) separated from the mixed flow A, and has a substantially cylindrical shape in the wet electric vacuum cleaner 1 of the present embodiment. As shown in FIGS. 1 and 2, the sewage tank 14 is provided with an introduction port 14 </ b> A for introducing the mixed flow A and a discharge unit 14 </ b> B for discharging the air C ′ substantially separating the sewage B from the mixed flow A. ing.

  Between the discharge part 14B of the sewage tank 14 and the suction part 15A of the electric fan 15, as shown in FIG. 1 and FIG. 2, further dirt and moisture are further obtained from the air C ′ obtained by substantially separating the sewage B from the mixed flow A. A filter 16 for separation is provided.

  The electric fan 15 generates suction force in the suction nozzle 11 by sucking and discharging air. In the present embodiment, the electric fan 15 sucks air C ′ substantially separated from the mixed flow A and discharges it. The air C is discharged from the part 15B. As the electric fan 15, an electric fan having an output of 1.5 kW or less is suitable for a home-use wet vacuum cleaner, and an electric fan having a power of 1.2 kW or less or 1.0 kW or less is used depending on conditions such as an object to be cleaned. It can also be used.

As shown in FIGS. 1 and 2, the wet electric vacuum cleaner 1 of the present embodiment further includes a liquid supply tank 57 in which the cleaning liquid W is stored, and a liquid feed that sends out the cleaning liquid W stored in the liquid supply tank 57. A pump 40, a connection tube 56 that communicates the liquid feed pump 40 and the liquid supply tank 57, and a liquid feed tube 52 that feeds the cleaning liquid W to the ejection nozzle 51 through the connection tube 56 by driving the liquid feed pump 40. It has.
The liquid feeding tube 52, the connecting tube 54, and the liquid supply tank 57 are not particularly limited in material, shape, size, and the like as long as they fulfill their required functions.
A specific configuration of the liquid feed pump 40 will be described later.

As shown in FIG. 1, the electric fan 15, the sewage tank 14, the liquid supply tank 57, the liquid feed pump 40, the connecting tube 56, and the like are housed in the housing 20. An air / water separator (not shown) is usually provided on the sewage tank 14, but this is also housed in the housing 20 together with the sewage tank 14. The suction hose 12 and the liquid feeding tube 52 are exposed from the upper part of the housing 20, and both are connected in parallel to the suction nozzle 11.
As the cleaning liquid, a liquid material containing a detergent is used according to the object to be cleaned. In some cases, a liquid such as water that does not contain a detergent may be used.

Next, the control (operation mechanism) of the liquid feed pump 40 in the wet type vacuum cleaner 1 of the present embodiment will be described in detail together with its configuration.
The liquid feed pump 40 is controlled so that the cleaning liquid is continuously and intermittently injected from the injection nozzle 51 by continuously and intermittently sending the cleaning liquid from the liquid supply tank 57 to the injection nozzle 51. Yes. Such a liquid feed pump 40 can be realized by adopting, for example, the following first configuration and second configuration.

The liquid feed pump 40 having the first configuration will be described in detail.
In the liquid feed pump 40 having the first configuration, a liquid feed motor (not shown) that drives the pump continuously rotates, so that the cleaning liquid is continuously ejected, and the liquid feed motor is intermittently operated. It is controlled so as to perform intermittent injection of the cleaning liquid by rotating.
More specifically, the liquid feed pump 40 of the first configuration is controlled so as to perform continuous injection and intermittent injection of the cleaning liquid from the injection nozzle 51 by using a step motor (stepping motor) for driving. Has been. Since the rotation of the motor and the stop of the motor can be arbitrarily set for the step motor by the controller, continuous injection and intermittent injection of the cleaning liquid can be carried out programmatically.

By outputting a command to intermittently rotate the step motor from the controller to the step motor, the step motor can be intermittently rotated. As a result, since the liquid feed pump 40 is intermittently driven, the cleaning liquid W stored in the liquid supply tank 57 is intermittently ejected from the ejection nozzle 51 via the connection tube 56 and the liquid feed tube 52. be able to.
In the above intermittent injection, for example, as shown in FIG. 6, if the cycle setting is made such that the step motor rotates 90 degrees for 0.25 seconds and pauses for 0.25 seconds, the step motor rotates once for 2 seconds. While performing (30 rpm), intermittent injection can be performed 4 degrees.

  Further, by outputting a command to continuously rotate the step motor from the controller to the step motor, the step motor can be continuously rotated as shown in FIG. As a result, since the liquid feed pump 40 is continuously driven, the cleaning liquid W stored in the liquid supply tank 57 is continuously ejected from the ejection nozzle 51 through the connection tube 56 and the liquid feed tube 52. be able to.

Next, the liquid feed pump 40 having the second configuration will be described in detail.
The liquid feed pump 40 of the second configuration is composed of a pair of first positive displacement pump 41A and second positive displacement pump 41B, and the cleaning liquid W is alternately supplied from the first positive displacement pump 41A and the second positive displacement pump 41B. The cleaning liquid is jetted continuously, and the cleaning liquid W is fed only from the first positive displacement pump 41A so that the cleaning liquid is intermittently jetted. That is, when intermittent injection is performed, since the second positive displacement pump 41B is not operated, the cleaning liquid W flows into the cylinder 42A by the operation of the first positive displacement pump 41A as will be described later. The cleaning liquid W is not jetted in the time zone, and the cleaning liquid W is jetted in the time zone in which the flowing cleaning liquid W is sent out.
Examples of the positive displacement pump include a piston pump and a plunger pump. The positive displacement pump described later is a piston pump.

  As shown in FIG. 8, the first positive displacement pump 41A is mainly configured by a cylinder 42A and a piston 43A that slides inside the cylinder 42A. Further, a connecting tube 56A that communicates with the liquid supply tank 57 and a branched portion 52A of the liquid feeding tube 52 that communicates with the injection nozzle 51 communicate with one end of the cylinder 42A via a connecting tube 44A that connects them. . An input / output switching valve 45A is provided at a connecting portion between the connecting tube 56A, the branch portion 52A, and the connecting pipe 44A. As shown in FIG. 8 (a), the input / output switching valve 45A causes the cleaning liquid W to flow out to the connection pipe 44A when it flows in from the connection tube 56A, and the cleaning liquid W is connected to the connection pipe 44A as shown in FIG. 8 (b). When flowing in from the pipe 44A, the cleaning liquid W is caused to flow out to the branch portion 52A, and the flow of the cleaning liquid W other than these flows is regulated.

  The second positive displacement pump 41B also has the same configuration as the first positive displacement pump 41A, and the description regarding the first positive displacement pump 41A can be appropriately applied to the description regarding the second positive displacement pump 41B. The description of the expression pump 41B is omitted. In addition, the code | symbol regarding the 2nd positive displacement pump 41B is attaching | subjecting "B" instead of "A" in the code | symbol (A is attached after the number) regarding the 1st positive displacement pump 41A.

The branch portion 52A of the liquid feed tube 52 in the first positive displacement pump 41A and the branch portion 52B of the liquid feed tube 52 in the second positive displacement pump 41B merge through the continuous intermittent switching valve 46, and one merge The portion 52C is communicated with the injection nozzle 51. That is, the branched liquid feeding tube 52 is formed from the branch portions 52A and 52B and the merge portion 52C.
As shown in FIG. 8B, the continuous intermittent switching valve 46 causes the cleaning liquid W to flow out toward the joining portion 52C when the cleaning liquid W flows into the continuous intermittent switching valve 46 from the branch portion 52A. As shown in FIG. 9A, when the cleaning liquid W flows into the continuous intermittent switching valve 46 from the branch portion 52B, the cleaning liquid W flows out toward the merging portion 52C, and the cleaning liquid W other than these flows flows. It regulates the flow.

  In this way, according to the liquid feed pump 40 configured by the pair of the first positive displacement pump 41A and the second positive displacement pump 41B, the cleaning liquid is continuously ejected and the cleaning liquid is intermittently ejected as follows. be able to.

When performing intermittent injection of the cleaning liquid, only the first liquid feed motor (not shown) that drives the piston 43A of the first positive displacement pump 41A is driven. As shown in FIG. 8A, when the piston 43A moves away from the connection pipe 44A, the inside of the cylinder 42A is in a negative pressure state, and the cleaning liquid W flows from the liquid supply tank 57 to the connection tube 56A and the input / output switching valve 45A. And flows into the cylinder 42A through the connecting pipe 44A.
Then, as shown in FIG. 8B, when the piston 43A moves in a direction approaching the connecting pipe 44A, the cleaning liquid W in the cylinder 42A is branched into the connecting pipe 44A, the input / output switching valve 45A, and the liquid feeding tube 52. It flows into the injection nozzle 51 through 52A, the continuous intermittent switching valve 46, and the merging portion 52C of the liquid feeding tube 52. As a result, the cleaning liquid W is ejected from the ejection nozzle 51.
In such an injection cycle, as shown in FIG. 8A, since there is a step of flowing the cleaning liquid W into the cylinder 42A of the first positive displacement pump 41A, the cleaning liquid W is intermittently supplied from the injection nozzle 51. Will be injected.

Further, when the cleaning liquid is continuously injected, the piston 43B of the second positive displacement pump 41B is driven together with the first liquid feed motor (not shown) for driving the piston 43A of the first positive displacement pump 41A. A second liquid feeding motor (not shown) is driven with a half cycle shift.
As shown in FIG. 9A, when the piston 43A moves away from the connecting pipe 44A, the inside of the cylinder 42A is in a negative pressure state, and the cleaning liquid W is supplied from the liquid supply tank 57 to the connecting tube 56A and the input / output switching valve 45A. And flows into the cylinder 42A through the connecting pipe 44A. FIG. 9A shows a state in which the cleaning liquid W has already flowed from the second positive displacement pump 41B toward the injection nozzle 51.
Then, as shown in FIG. 9B, when the piston 43A moves in the direction approaching the connecting pipe 44A, the cleaning liquid W in the cylinder 42A is branched into the connecting pipe 44A, the input / output switching valve 45A, and the liquid feeding tube 52. It flows into the injection nozzle 51 through 52A, the continuous intermittent switching valve 46, and the merging portion 52C of the liquid feeding tube 52. As a result, the cleaning liquid W is ejected from the ejection nozzle 51.

On the other hand, when the cleaning liquid W flows out from the first positive displacement pump 41A, as shown in FIG. 9B, when the piston 43B moves away from the connecting pipe 44B in the second positive displacement pump 41B, the cylinder 42B. The inside becomes a negative pressure state, and the cleaning liquid W flows from the liquid supply tank 57 into the cylinder 42B through the connection tube 56B, the input / output switching valve 45B, and the connection pipe 44B.
As shown in FIG. 9A, when the piston 43B moves in a direction approaching the connecting pipe 44B, the cleaning liquid W in the cylinder 42B is branched into the connecting pipe 44B, the input / output switching valve 45B, and the liquid feeding tube 52. 52B, the continuous intermittent switching valve 46, and the merging portion 52C of the liquid feeding tube 52 flow into the injection nozzle 51. As a result, the cleaning liquid W is continuously ejected from the ejection nozzle 51.

  In this way, the first liquid feeding motor that drives the piston 43A of the first positive displacement pump 41A and the second liquid feeding motor that drives the piston 43B of the second positive displacement pump 41B are driven with a half cycle shift. Accordingly, the cleaning liquid W alternately flows out of the first positive displacement pump 41A and the second positive displacement pump 41B and flows into the injection nozzle 51, and is thus continuously injected from the injection nozzle 51.

  Accordingly, the driving of the second liquid feeding motor for driving the piston 43B of the second positive displacement pump 41B is turned on / off while the first liquid feeding motor for driving the piston 43A of the first positive displacement pump 41A is constantly driven. By doing so, it is possible to control continuous injection of the cleaning liquid from the injection nozzle 51 and intermittent injection of the cleaning liquid.

  In addition, in the said 2nd structure, although the liquid feeding pump 40 is comprised from a pair of positive displacement pump, if it is paired, it can also be comprised from two pairs or three or more pairs of positive displacement pumps.

In the wet type vacuum cleaner 1 of this embodiment, the liquid feeding pump 40 and the electric fan 15 are further controlled as follows.
The liquid feed pump 40 is controlled so that continuous injection of the cleaning liquid starts after the suction force in the suction nozzle 11 is stabilized. The stabilization of the suction force here means that, for example, the time variation of the suction force is 20% or less.

Such control uses, for example, a method of controlling the amount of liquid feeding by applying feedback control to the liquid feeding pump or stabilizing by applying pressure with a throttle valve to the cleaning liquid sent from the liquid feeding pump. This can be realized.
By performing such control, the cleaning liquid injection from the injection nozzle 51 under a state where the suction force at the suction nozzle 11 is insufficient is not started, and the suction from the suction nozzle 11 due to the fact that the cleaning liquid cannot be completely sucked. The leakage (sagging) of the cleaning liquid can be prevented. This effect is particularly remarkable in a home-use wet vacuum cleaner that requires a compact design and cannot obtain a large suction force.

  Further, the liquid feed pump 40 is controlled so that the cleaning liquid is continuously sprayed first, and after the stabilization, the cleaning liquid is intermittently sprayed. Here, the stabilization of continuous injection means that, for example, the temporal variation of the injection amount becomes 20% or less.

Such control is performed by, for example, installing a flow rate sensor inside the injection nozzle 51, and when the flow rate of the cleaning liquid exceeding a specified amount is detected by the flow rate sensor, intermittent injection is performed to the controller of the liquid feed pump 40. This can be realized by outputting a command. It can also be realized by sequential control in which an intermittent injection command is issued after a so-called microcomputer issues a continuous injection command for a certain period of time to the liquid feed pump 40.
By performing such control, the amount of cleaning liquid used is saved by continuously injecting the cleaning liquid at the start of the injection when the injection is unstable, and switching to intermittent injection of the cleaning liquid after the stabilization of the injection. I can. Accordingly, the amount of cleaning liquid sprayed to remove dirt can be made necessary and sufficient, so that the amount of cleaning liquid used can be saved while ensuring the cleaning effect. That is, efficient use of the cleaning liquid can be achieved.

Further, the liquid feed pump 40 is controlled so that the continuous injection of the cleaning liquid starts again after the intermittent injection of the cleaning liquid.
Such control can be realized, for example, by the method described above.

  Such control is performed, for example, when the remaining amount of the cleaning liquid in the liquid supply tank 57 is reduced, so that even if the remaining cleaning liquid decreases, the injection of the cleaning liquid does not tend to be interrupted. A sufficient amount of cleaning liquid can be ejected.

Furthermore, the electric fan 15 is controlled so that the rotation of a suction motor (not shown) that drives the electric fan 15 starts to decelerate after the liquid feed pump 40 is stopped. Preferably, the electric fan 15 is controlled such that the rotation of a suction motor (not shown) that drives the electric fan 15 starts to decelerate after the ejection of the cleaning liquid from the injection nozzle 51 is stopped.
Such control can be realized by, for example, general microcomputer control that is sequence-controlled in a programmatic manner. Specifically, the pattern is the pump stop ⇒ electric fan deceleration ⇒ electric fan stop.

In this pattern, it is not possible to perform suction only by the electric fan. However, when it is desired to perform suction only, after the liquid feed pump 40 is stopped, the electric fan 15 is stopped after a certain time has elapsed. The operation of the liquid pump 40 may be controlled by a microcomputer.
By performing such control, it is possible to prevent the suction in the suction nozzle 11 from being finished while the spray of the cleaning liquid from the spray nozzle 51 continues, and the cleaning liquid from the suction nozzle 11 due to the fact that the cleaning liquid cannot be completely sucked. Leakage (sagging) can be prevented.
Further, when the liquid feed pump 40 is stopped and only the suction by the electric fan 15 is performed, it is possible to perform suction of dirt (particularly water) that does not require the cleaning liquid W.

The wet type vacuum cleaner of the present invention is not limited to the above-described embodiment, and can be appropriately changed as shown below, for example, without departing from the spirit of the present invention.
The configuration for realizing continuous injection of cleaning liquid and intermittent injection of cleaning liquid in the liquid feed pump is not limited to the first configuration and the second configuration, and for example, the flow rate by controlling the rotation speed of the liquid feed pump Control may be used.

  The liquid feed pump is in a state in which the cleaning liquid is filled in the liquid feeding tube communicating with the injection nozzle as when the cleaning operation is interrupted (for example, 90% or more of the internal volume of the liquid feeding tube is filled with the cleaning liquid. In this state, it is preferable to control the spraying of the cleaning liquid immediately without intermittently spraying the cleaning liquid.

  The wet type vacuum cleaner of the present invention is more suitable for cleaning objects to be cleaned with fine irregularities such as carpets than to clean objects to be cleaned such as flooring, in addition to tatami mats, flooring, It can also be used to clean building structures such as window glass. In addition to the building structure, it can also be used for cleaning car seats and sofas, for example.

FIG. 1 is a perspective view showing a wet type vacuum cleaner according to an embodiment of the present invention, with its housing virtually seen through. FIG. 2 is a schematic view showing the whole of the wet type vacuum cleaner shown in FIG. 1 together with distribution channels such as dirt and moisture. 3A and 3B are perspective views showing a suction nozzle in the wet type vacuum cleaner according to the embodiment of the present invention, in which FIG. 3A is a diagram showing a state in which a front part and a rear part are connected, and FIG. 3B is a front part and a rear part. It is a figure which shows the state which divided | segmented the part. FIG. 4 is a front view showing a rear portion of the suction nozzle in the wet type vacuum cleaner according to the embodiment of the present invention. FIG. 4A is a view showing a state where the shielding plate is positioned above, and FIG. 4B is a drawing showing the shielding plate. It is a figure which shows the state located below. 5A is a VA-VA sectional view shown in FIG. 4A, and FIG. 5B is a VB-VB sectional view shown in FIG. 4B. FIG. 6 is a graph and a diagram schematically showing temporal changes in the rotation state of the step motor that drives the liquid feeding pump when intermittently injecting the cleaning liquid by the liquid feeding pump having the first configuration. . FIG. 7 is a graph and a diagram schematically showing a temporal change in the rotation state of the step motor that drives the liquid feeding pump when the cleaning liquid is continuously ejected by the liquid feeding pump having the first configuration. . FIGS. 8A and 8B are diagrams schematically showing the driving of the positive displacement pump when the cleaning liquid is intermittently ejected by the liquid feeding pump having the second configuration. FIGS. 9A and 9B are diagrams schematically showing the driving of the positive displacement pump when the cleaning liquid is continuously ejected by the liquid feeding pump having the second configuration.

Explanation of symbols

11 suction nozzle 11A front part 11B rear part 11C tip part 12 suction hose 12A one end part 12B other end part 14 sewage tank 14A inlet 14B discharge part 15 electric fan 15A suction part 15B exhaust part 16 filter 20 housing 40 liquid feed pump 41A first 1 positive displacement pump 41B 2nd positive displacement pumps 42A, 42B Cylinders 43A, 43B Pistons 44A, 44B Connection pipes 45A, 45B Input / output switching valve 46 Continuous intermittent switching valve 51 Injection nozzle 51A Injection port 52 Liquid supply tube 52A, 52B Branching portion 52C Junction portion 53 Shielding plate 53A Conducting portion 53B Bar-like portion 54 Bent conduit 55 Tube connection portion 56 Connection tube 57 Liquid supply tank 61 Tip portion 62 Soft member 63 Front body 64 Rear end fitting portion 65 Piston notch portion 66 Hollow expansion portion 67 Brush 71 Tip 72 Front Fitting portion 73 Rear body 74 Flow cutout portion 75 Guide convex body 76 Piston 77 Shaft portion through hole 78 Coil spring 79 Hose connecting portion A Mixed flow B Wastewater C Air C ′ Air W substantially separating wastewater B from mixed flow A Cleaning liquid

Claims (7)

An injection nozzle for injecting cleaning liquid onto the object to be cleaned, a suction nozzle for sucking dirt and moisture together with air, a liquid feed pump for sending the cleaning liquid stored in the liquid supply tank to the injection nozzle, and a suction nozzle A suction hose that conducts a mixed flow of dirt, moisture, and air, an electric fan that generates suction force at the suction nozzle by sucking and discharging air, and storing dirt and moisture separated from the mixed flow A wet vacuum cleaner comprising a wastewater tank,
The liquid feed pump is controlled to continuously and intermittently inject the cleaning liquid from the injection nozzle by continuously and intermittently sending the cleaning liquid from the liquid supply tank to the injection nozzle. Wet vacuum cleaner.   2. The wet electric vacuum cleaner according to claim 1, wherein the liquid feeding pump is controlled so as to first continuously spray the cleaning liquid and stabilize the cleaning liquid, and then intermittently spray the cleaning liquid.   The wet-type vacuum cleaner according to claim 2, wherein the liquid feeding pump is controlled to continuously inject the cleaning liquid after the suction force at the suction nozzle is stabilized.   The wet-type vacuum cleaner according to claim 2 or 3, wherein the liquid feeding pump is controlled to continuously spray the cleaning liquid again after intermittent spraying of the cleaning liquid.   The liquid feeding pump continuously ejects the cleaning liquid by continuously rotating a liquid feeding motor that drives the liquid feeding pump, and intermittently cleans the cleaning liquid by intermittently rotating the liquid feeding motor. The wet vacuum cleaner according to any one of claims 1 to 4, wherein the wet vacuum cleaner is controlled so as to perform injection.   The liquid feed pump is composed of a pair of a first positive displacement pump and a second positive displacement pump, and the cleaning liquid is supplied by alternately sending the cleaning liquid from the first positive displacement pump and the second positive displacement pump. The wet type vacuum cleaner according to any one of claims 1 to 4, which is controlled so that continuous injection and intermittent injection of the cleaning liquid are performed. The wet electric vacuum cleaner according to any one of claims 1 to 6, wherein the electric fan is controlled to decelerate rotation of a suction motor that drives the electric fan after the liquid feeding pump is stopped.

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