JP3343183B2 - Reflux and suction type vacuum cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the field of electric vacuum cleaners using a fan motor, and relates to a suction type vacuum cleaner or a recirculation type vacuum cleaner which reuses energy downstream of a fan motor.

[0002]

2. Description of the Related Art A number of methods for reusing the wake energy of a fan motor in a vacuum cleaner have been proposed in the prior art, and the present inventor has also proposed it in Japanese Patent Publication Nos. 7-44911, 7-24643 and others. However, in many cases, only proposals are based on principles, and those accompanied by experimental verification are described in JI 7-24643 described by the present inventor.
Not found except for S-groove sand removal test.

On the other hand, vacuum cleaners have practically required performances covering a large number of items, all of which must be satisfied. The items are listed as follows: small size, light weight, power saving, nozzle width, groove sand removal, carpet sand removal, thin material non-adsorption, quiet noise, yarn trash-wall sand removal, beans-rice-coin-small metal removal, runnability -Large garbage, tatami surface dust, temperature rise, deterioration due to garbage accumulation of the filter, various replacement nozzles, no sand blowout by the recirculation jet, low exhaustion, crossing steps, etc. There is no example that the recirculation type vacuum cleaner can satisfy all of these required performances except for removing the gutter. These performances may require conflicting technical measures. Therefore, it is also a problem whether or not an appropriate balance point can be found.

FIGS. 8 and 9 are schematic views of a conventional recirculating head.
FIG. 3 is a cross-sectional view showing a configuration of a suction trachea and a reflux trachea. Both figures
In the drawings, parts having the same functions are denoted by the same reference numerals.
I have. In the figure, 1 is an intake pipe, 2 is a return pipe, and 3F is a front.
Suction nozzle, 3B is rear suction nozzle, 4 is jet of recirculating air
The mouth, 5F is a front cleaning room, and 5B is a rear cleaning room . FIG.
9A shows an example of an independent trachea in which the intake pipe 1 and the recirculation pipe 2 are separated from each other, and FIGS. 8B and 9B show examples of a double trachea in which one pipe is provided inside another trachea. Considering the case of sucking large-sized dust, it is desirable that the inside is a suction pipe and the outside is a reflux pipe. However, considering practical manufacturing techniques, the twin trachea (TWIN) is more independent than the double trachea.
HORSE) is more desirable.

[0005] the In the吹外intake before and after symmetrical array head 8 roughly in consolidation of the suction pipe of the jet unit before cleaning space A, two methods shown in B is presented. 8A, the recirculation trachea 2 is connected to a jet front chamber 6 which is long in the left and right direction (perpendicular to the plane of the paper), and a jet unit 7 having a jet port 4 is connected to the jet front chamber. The cleaning space 5F in front of the jet unit communicates with the suction pipe 1 via a pre-jet chamber and a suction pre-chamber 19 which is a space above the jet pre-chamber 5F. Figure 8B when combined with double trachea
As shown in FIG. The format of FIG. 8A is exemplified in the aforementioned Japanese Patent Publication No. 7-24643.

FIG. 9A is a view showing a second example, and FIG. 9A shows suction pipes 1F and 1B respectively attached to the left and right front suction chambers 5F and 5B substantially at the center of the front suction chamber 5F and the rear suction suction chamber 5B. Thus, one suction tube 1 is obtained. If a double-pipe system is used, it becomes as shown in FIG. 9B. However, the double-pipe method has to be used for internal blow-out and is not desirable. That is, FIGS. 8B and 9B have a disadvantage that large-volume dust cannot pass through the suction tube. Next, the problem of FIG. 8A is that it is practically difficult for the high-density dust (money, small metal items, beans, etc.) sucked in the front cleaning chamber to rise by the suction airflow and pass through the upper part of the jet front chamber. At one point.

[0009] The problem of FIG. 9A is that the diameter of the two separate suction pipes is too small to maintain the required flow velocity, and is not suitable for suctioning large-sized dust. And the necessity of a connecting portion for merging them into one, and a practical installation method of such suction pipes cannot be found. Further, it is difficult to extend the jet part to the end of the horizontally long recirculation type head having the horizontally long jet part substantially at the middle of the front-rear width of the head at the left and right ends. Therefore, there is a problem that the cleaning power near the left and right ends of the head is reduced.

[0010]

SUMMARY OF THE INVENTION The present invention relates to the conventional
Eliminates the problems of the recirculating head and achieves high flow rates in the cleaning space
Circulating head that can obtain large dust
The purpose is to provide .

[0011]

SUMMARY OF THE INVENTION In order to solve the above-described problems, the present invention provides a cleaning head for a fan motor.
A recirculating vacuum cleaner that recirculates to the installed jet outlet
In addition, the cleaning head draws air almost in the center in the left-right direction.
Horizontal cleaning head with mouth and space extending left and right
And the space extending to the left and right is the front and rear width of the cleaning head.
Has a spout provided on the lower surface of the cleaning head at almost the middle of the
Long slit-shaped jet outlets on the left and right
The reflux is temporarily stored by communicating with the jet outlet.
A jet for making the jet flow velocity distribution almost uniform in the horizontal direction
The front chamber is placed in the cleaning head and the fan
The wake is divided into approximately two parts, and the right and left ends of the jet anterior chamber
Because it is characterized by supplying air to the vicinity, in front of the cleaning head
Is the spout provided on the lower surface of the cleaning head almost at the middle of the rear width?
Suction mode around the head
To keep the energy behind the fan
It can be used effectively. Furthermore, the wake of the fan
Into approximately two parts, near the left and right ends of the front chamber of the jet
Thus, the cleaning efficiency can be compensated by the recirculation jet even at the left and right ends of the cleaning head having a weak suction force.

Further, according to the present invention, the wake of the fan of the fan motor is connected to a recirculation flow passage communicating with the jet outlet, and is sucked from a suction port (509) from the outside air to rotate the motor of the fan motor. A cooling flow passage that is cut off from the return flow passage that passes through the gap between the stator and the stator and communicates with the outside through a discharge port (510) to the outside air; A cooling fan that supports the rotating shaft is provided.
Because characterized Rukoto, to prevent overheating of the fan motor can be enhanced recirculation ratio, the energy of the fan downstream can be used to effectively clean.

[0013] The present invention further provides a fan for the fan motor.
A return channel communicating with the jet outlet,
Before cooling the fan motor and communicating with the outside
The flow is divided into the reflux flow path and the separated cooling flow path,
85% or less 60% or more
15 to 40 downstream of the fan
% To the cooling channel
Can be cooled effectively .

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventor has prototyped a jet recirculating vacuum cleaner with a fan motor of 500 W of input power, and
Compared to a suction-type vacuum cleaner with a fan motor of 00W, it was demonstrated that all items achieved the same or better results. The present invention is based on the ingenuity made at that time.

Hereinafter , an embodiment of the present invention will be described with reference to the drawings.
This will be described with reference to FIG . FIG. 1 is a diagram showing the structure of a horizontally recirculating head according to the present invention . Figure 1A is a top view, the right end has a horizontal cross-sectional view at Z ₃ levels of Figure 1C. Figure 1C is a vertical sectional view in Y ₁ in FIG. 1A, a top view of the lower excluding the upper structure 16 of Figure 1B Figure 1C, rubber body 18 (jet unit 7, the horizontal elastic portion 8, shock absorbing bumpers 9) is visible. Reference numeral 17 denotes an opening in the lower structure 15 and the rubber body 18 and communicates with the upper suction front chamber 19.

The right end shows the upper surface of the lower portion 15 obtained by cutting the rubber body 18 at the Z ₂ level. Left in the horizontal cross-sectional view at Z ₁ level, the cross section of the jet portion 7L, front wheels 13L section, the lower flange 11 is visible. 1 is a suction tube, 2
(2R, 2L) is a reflux tube, 3F, 3B are front and rear suction ports, respectively, 4 is a jet outlet, 7 is a slit-shaped jet portion, 8 is a vertical displacement of the jet portion 7 (7R, 7L) and before and after a lower end. A horizontal elastic portion 9 that supports the jet portion while elastically and airtight while allowing tilting, 9 is a bumper,
In the illustrated embodiment, the jet part 7, the horizontal elastic part 8,
The bumpers 9 are all integrally formed as a rubber body 18. These jet part 7, horizontal elastic part 8, bumper 9
May be formed separately , and the jet unit 7
May be a hard material, and the horizontal elastic portion 8 may be a leaf spring or the like. In the illustrated embodiment , the horizontal elastic portion 8 is always pushed downward by the ceiling of the lower structure 15 by the positive pressure of the jet front chamber, and assists the elastic holding force of the horizontal elastic body 8 itself.

The jet outlet 4 at the lower end of the jet portion 7 is a slit opening which is long and narrow in the left and right, but may be a row of short openings in the left and right such as a circle and a rectangle. When the jet part 7 is made of rubber, short spacers 2 are provided at several places in the left and right direction of the slit in order to keep the slit width constant.
04 (FIG. 2D) may be provided. At the lower end of the side wall surrounding the head, that is, in FIG. 1C, a flange 11 is provided on the inner side at the lower end of the lower structure 15 to prevent the jet airflow from the jet outlet 4 from blowing out of the head. Flange 1
The height of the tip 1 from the floor surface F is usually about 0.5 to 2 mm. Since flange 11 is inward, in a jet stream, flows toward the this portion jet stream decreases towards the out-out sorting et Re blown up and down at the tip of the flange 11, the suction in the flange 11 the lower surface of the outside air Canceled by the flow.
The lower surface of the flange 11 in the outer囲下end reference surface, the height from the floor surface F is h _p.

As shown in FIG. 10, the lower end of the jet port 4 gradually tilts upward as the distance from the port 4 increases.
It has a slanted flange portion at the front and back. The gentle slope of the flange prevents the lower end of the jet from getting into the carpet hair when cleaning the carpet. The movement resistance can be reduced by easily passing under the moving object.

[0019] Now in FIG. 3 B, the lower end of the jetting port 4 is almost in contact position projecting to the floor F below the outer囲下end reference surface level h _p. Regarding the height h _j above the floor at the lower end of the jet outlet 4, beyond the conventional concept, the data of the cleaning ability for various h _j was taken to a level almost in contact with the floor without fear of contact with the floor, below the majority h _p there is an optimum of h _j to most close to the floor surface. Especially J
The effect was remarkable in the IS groove sand test. However
Et al., The head outside the lower end surface of the jetting port 4 on the one hand
The arrangement below the lower reference plane creates a risk that the lower end of the jet outlet 4 comes into contact with the convex portion of the floor surface, and the floor or the jet portion 7 may be damaged.

[0020]The lower end of the jet outlet 4 is used for floors and obstacles
Place of contactIfBecause the jet part 7 is rubberyUpward
Displace or tilt back and forth to reduce contact pressurePrevent damage
You. 2A and 2B show a plastic in which the jet part 7 is hard.
2A, the jet part 7 is a plate.
On the ceiling of the lower structure 15 by the spring 201 and the screw 202
When the jet is in contact with the floor surface of the jet
The jet part 7 is pushed up as shown by the arrow. Figure
2B is the ceiling of the rigid jet unit 7 and the lower structure 15
Are connected by a cylindrical sliding surface 203 and jet
When the jet 4 comes into contact with the floor surface of the port 4, the jet 7
Tilt back and forth as indicated by the mark.

2C and 2D, a part of the jet portion 7 is made of a rubbery elastic body (dotted portion in the figure), and when the elastic portion is deformed, when the jet outlet 4 comes into contact with the floor surface, FIG. In FIG. 2D, the hard jet portion 7 is displaced up and down as indicated by arrows, and in FIG. 2D, the jet outlet 4 of the elastic jet portion 7 is tilted up and down and up and down as indicated by arrows. In this case, since the jet outlet 4 at the tip is easily deformed, a spacer 204 is provided to secure a specific slit width.
It is divided into a plurality of blocks 7-1 to 7-4 the jet portion 7 in the lateral direction as shown in FIG. 2E, also only the blocks in contact with the floor is configured to vertical displacement or tilting locally
Good . In the figure, reference numerals 201-1 to 201-4 denote blocks
It is pressed against the ceiling of the lower structure 15 by a leaf spring provided for each .

In the embodiment shown in FIG. 1, an upper structure 16 and a lower structure 15 are roughly divided, and a rubber body 18 is sandwiched between the upper structure 16 and the lower structure 15, and they are integrally tightened with screws indicated by marks. The upper structure 16 and the rubber body 18 form the jet front chamber 6. At the middle of the front and rear widths of the ceiling of the lower structure 15, long openings are provided on the left and right, and the rubber body 1 is provided in the opening.
The jet part 7 provided integrally with the projection 8 is inserted protruding downward. As shown in FIG. 1A, the return pipes 2R and 2L are connected to the jet front chamber 6 near the left and right ends of the head. After the wake of the fan is introduced and temporarily stored, the jet outlet 4 is passed through the jet unit 7. It is jetted out as a jet. The jet flow and the outside air sucked from the lower surface of the flange 11 are guided to the suction pipe 1 in the cleaning spaces 5F and 5B formed .

The pre-jet chamber 6 is divided into a left 6L and a right 6R, and a pre-suction chamber 19 communicating with the suction pipe 1 is provided at the center. The pre-jet chamber 6L, the pre-suction chamber 19 and the pre-jet chamber 6 are provided.
The R and the pre-suction chamber 19 are separated from each other in a gas flow by a partition (FIG. 1A). As shown in FIG. 1B, the jet portion 7 of the rubber body 18 is similarly divided into right and left portions 7L and 7R . At approximately the left and right centers of the ceiling of the rubber body 18 and the lower structure 15,
A large-area opening 17 communicating with the pre-suction chamber 19 is provided. The airflow in the front and rear cleaning chambers 5F and 5B corresponding to the jet sections 7R and 7L is directly sucked from the opening 17 into the pre-suction chamber 19 and further into the suction pipe 1 without any obstruction.

In this manner, the airflow velocity in the cleaning chambers 5F and 5B can be made large, the cleaning power can be increased, and large dust that can pass through the opening 17 and the suction pipe 1 can be lifted by lifting the head. If it can be attracted under 17, it can be removed by suction. It is desirable that the cross-sectional area of the air flow of the opening 17 and the pre-suction chamber 19 is about 0.5 to 2.0 times the cross-sectional area of the suction pipe 1, and is preferably substantially equal.

In FIG. 1, reference numerals 12F and 12B denote a front side wall and a rear side wall of the lower structure 15, which extend inward as shown in FIG. front and rear width is narrow, each cleaning chamber 5F, the flow velocity of the air stream 5B flows is prevented from lowering. This is to prevent dust carried by the high-speed airflow in the cleaning rooms 5F and 5B from dropping in the lower suction room. A floor sensor can be incorporated into 12F, and wheels can be incorporated into 12B. The main members 15, 16, and 18 can be made separately by injection molding, compression molding, or the like, and can be excellent in mass productivity and inexpensive. The flange 11 of the lower structure 15 slightly complicates the mold. However, in some cases, the lower structure 15 is further divided into two layers and manufactured separately from the ceiling and the side wall, and the flange and the side wall, so that the die can be easily removed. It can also be.

The reflux is divided into two parts, and the left and right
The structure in which air is supplied to the vicinity of the end can be similarly applied to a structure that is not divided right and left at the center, for example, a structure shown in FIGS. In FIG. 1, the reflux tubes 2L and 2R are the jet front chamber 6
L and 6R are connected to portions near the left and right ends, respectively. In this way, the air flow introduced from the reflux pipes 2L and 2R is temporarily stored in the jet front chambers 6L and 6R, becomes substantially uniform pressure, is applied to the jet part 7, and the jet flow velocity distribution exiting the jet outlet 4 is obtained. Is almost uniform in the left-right direction, but the pressure is slightly higher near the connection portion of the reflux pipe, and the jet velocity can be increased. Although the suction is weak at both ends of the head and the cleaning efficiency is low, the decrease in efficiency at both ends can be compensated.

FIG . 3 is a perspective view of the lower structure 15 of the cleaning head.
Micro-channel at the horizontal end of the edge 11
2 shows an embodiment in which the modules 301 and 302 are provided . Figure 3A is a front view, FIG 3B is a Y4 vertical sectional view of FIG. 3A, micro
A channel is used when the cleaning head adsorbs
And a plurality of minute flow paths for ventilating the cleaning room .
Reference numeral 301 generally denotes a section equivalent to a brush for clothes, which is adhered to the flange 11 as shown in the figure. Bristles of the brush is directed to the head inside, and yarn dust on carpet, hair and the like Ru is so also waste as taken combed to clean space side during the scanning enters the inside.

In the above embodiment, a description has been given of a horizontally long recirculation type head . However, the front edge is substantially straight, the front and rear widths and heights of the right and left ends of the rear edge are slightly narrower, and the center before suction is formed. The present invention also includes a tapered head whose front and rear width and height are slightly wide in the vicinity of the chamber, a head whose shape is appropriately rounded, and various modifications according to the concept of the present invention. In the trial production of the concrete demonstration machine described above, the first problem was the danger of insufficient cooling of the fan motor due to reflux. To this end, a reduction in the reflux rate shown in JP-B-7-44911 was effective. It is appropriate that the reflux rate is about 80 to 70% for keeping the head periphery in the suction mode and for cooling.

In Japanese Patent Publication No. 7-44911 described above, the reflux rate was 98% to 60%. The purpose was to maintain the periphery of the head in the suction mode and to cool the fan motor. That release rate Q _E which corresponds to release of 2% to 40% is released to the outside air, the new ambient air of the same flow rate Q _E is newly sucked from around the head is the principle.

In the trial production of this demonstration machine, it was found that it was possible to set the periphery of the head in the weak suction mode at the emission rate of 2%, but it was accompanied by difficult technical restrictions. That is,
Non-uniformity of jet ejection, non-uniformity near the end of the jet part, non-uniformity of the outer peripheral side wall (wheels, micro-channel walls, etc.), and the mixing and mixing of jet and suction airflow in the cleaning room Since the external blowing force of the jet airflow is locally different depending on the ratio, etc., in order to sufficiently cover this local variation and set the entire circumference of the head in the suction mode, an emission rate of about 10% (reflux rate 90%) is required. Turned out necessary.

[0031] Also, cotton waste, paper waste, etc. near the head, but dimensionally greater than the head outer periphery (especially the leading edge) on the floor of the lower high h _f, since deformable, passes through the h _f by suction In order to suck and clean the dust that can be removed into the head in the regular mode (recirculation) without lifting the leading edge in the large dust mode, it is necessary to further increase the suction force around the head to set the medium suction mode. Sex was found. Also, the fan motor winding temperature is slightly lower than the safety standard value (115 degrees with class E insulation) under the worst conditions of input voltage 110V, full amount of dust accumulation in the garbage bag, and ambient temperature 35 degrees in summer. In order to maintain a sufficient margin and to make effective use of the reflux energy as much as possible, the release rate is 15 to 40% (the reflux rate is 85 to 6%).
0%) was found to be appropriate. That is, the reflux rate is 85
% Or less and preferably 60% or more.

Cooling of fan motor in recirculating head
In order to achieve sufficient
It is effective to use . A typical structure of the bypass fan motor will be described with reference to FIG. 4A. Reference numeral 502 denotes a motor rotor. Reference numeral 503 denotes a motor stator, each of which is wound with a winding not shown. Generally connected directly to the rotation axis
A work fan 501 and a cooling fan 517 used for sucking dust are provided and rotate at high speed. Work fan 501
Is often of the spiral blade centrifugal type, and the air sucked from the suction port 505 is accelerated and pressurized by the blade pieces and centrifugal force, and is discharged in the radial direction from the periphery and passes through the flow path 504 provided in the periphery And is output from the outlet 506. This flow Q _O is the work flow. On the other hand, the work flow path is cut off in a gas flow manner to provide a motor cooling flow path (flow rate q _c ). q _c is supplied to a hole 5 at the other end of the motor by the cooling fan 517.
09, passes through the gap between the rotor 502 and the stator 503, cools the winding and the iron core, and is discharged from the discharge port 510. Since Q _O is separated from q _c in this way, Q _O
The temperature rise is only due to its own adiabatic compression and is slight.

When this bypass type fan motor is used in a recirculation type vacuum cleaner and the work flow Q _O is used for suction and recirculation, the conventional direct type fan motor reduces the suction flow Q _O by one.
Since it is used for 00% cooling, it is possible to solve the problem that the temperature of the downstream side of the fan is significantly increased, and further, the heating is repeatedly performed by reflux. However, the bypass type has drawbacks in that it has a complicated structure, many parts, is expensive and large, and the direction of the work flow output tube is inconvenient to use.

In the prototype device, the discharge rate of the fan
Although the temperature rise was within the permissible safety range under the worst conditions described above, it is desirable that the temperature of the outer casing of the device be as low as possible from the viewpoint of the user's bodily sensation and a low release rate for effective use of the reflux ( It is desirable to have a small rise in temperature even at high reflux rates), which is a justification for the use of the bypass type despite some drawbacks.

By slightly improving the conventional direct type fan motor and approaching the bypass type, the advantages of both can be used and the disadvantages of both can be eliminated. This embodiment is shown in FIG. 4B. 4A is different from the cooling fan 517 in FIG.
In terms there is no radial output flow from the periphery of the vortex MakiTsubasa centrifugal fan 501 is diverted to the q ₁ and q _2, the fan case
The plurality of holes 507 provided is output fan directly output flow q _1, the remaining cooling output flow q ₂ is output to cool the motor. (Hereinafter referred to as shunt direct type.) On the other hand a so-called direct type which are used in conventional suction type vacuum cleaner, and corresponds to the case where the hole 507 in FIG. 4B is closed, the total amount Q _O motor Is cooled and output. Therefore, the output stream is heated by the heat generated by the motor. Direct flow q
₂ has a higher temperature than the direct output flow because q ₂ <Q _O , and q ₁ has almost no temperature rise.

In order to use this split direct fan motor in a recirculating vacuum cleaner, the flow path is indicated by a dotted line in FIG. 4B.
Cooling output flow q ₂ is separated from the direct output flow q ₁ flow path 512
And a discharge branch 514 having a branching blade 515.
(Flow rate Q _E ) and return path 513 (flow rate q _2R ).
q _2R is output from the flow Q _R next to reflux output path 516 are merged mixed with q _1. Q _O = q ₁ + q ₂ , q ₂ = Q _E
A _{+ q 2R, Q R = q} 1 + q 2R.

The advantages compared to the conventional direct type of this method, the same Q _O, Q _E, which makes this method is Q against _E
High temperature of, many heat energy released to the outside, the temperature of the reflux Q _R is lower and when it is repeatedly circulated at reflux,
The temperature of the input flow Q _O is low, the heat removal from the motor is increased, and the motor winding temperature, circulation flow temperature,
The equipment jacket temperature is lower. In addition, the split direct fan motor is a conventional direct fan motor.
Since only a plurality of holes indicated by 507 in B are provided,
The simplicity and low cost of the structure remain the same. The size of the hole 507, the number of holes, and the opening of the valve blade 515 can be adjusted optimally.

It is necessary to switch to the pure suction mode in addition to the operation in the normal reflux mode, in addition to the operation in the normal reflux mode, as described in Japanese Patent Publication No. Hei 7-24643. Reduce the rate to use the strong suction mode,
It is clear from an example that proposes a method of turning off the flow rate of the head. As a result of the trial production, in the main case where this switching is necessary for practical use, (b). When lifting the front edge of the head in the large dust mode, which draws large size dust into the head,
(B). (C) when the non-floor nozzles such as gap nozzles and shelf nozzles are connected to the suction hose by removing the flow path from the floor head. (D) when lifting and pushing the front edge of the nozzle without lifting the main body and lifting the nozzle together with the main body into the air,
It has been found that the fine optimization of the reflux rate according to the type of cleaning surface is not so important. (A) and (b) should be a pure suction mode, and it is desirable to maximize the suction force, and it is desirable that they be automatically switched by a floor sensor and a suction hose sensor, respectively. (C) and (d) need only be in the jet ejection stop mode, and the head need not necessarily be in the pure suction mode, but may be in the pure suction mode.

In the present invention, in order to solve the problems of complexity and high price due to an increase in the number of modes, two types, a reflux mode and a pure suction mode, are used. The operation mode of the recirculating vacuum cleaner is simplified to two modes, a normal recirculating mode and a pure suction mode, and the object is to simplify the operation, simplify the structure control, and reduce the cost as a result. The pure suction mode has the following conditions.
When the cleaning head (or its leading edge) is separated from the floor and the floor sensor _SF is activated (ON), that is, at the time of suctioning large trash or climbing over a high step, at the time of a head lift, at the time of transporting by lifting the entire cleaning head , or 2. When replacing the nozzles used, when a suction hose detachment was detected replacement nozzles mode detected by the hose sensor S _H, in, is automatically executed. When the condition is released, the mode is automatically returned to the reflux mode.

The above-mentioned mode switching is performed by a switching valve 709 (FIG. 5).
Done by 5, 701 in landscape reflux heads, floor sensor S _F is provided. S _F is
Outputs ON when the front edge of the head is lifted. A head suction tube 702 is connected to one end, and a detachable connected portion of the nozzle side end 703 of the suction tube 704 is connected to the other end, and a micro switch for detecting the attachment / detachment of the 703 is a hose sensor _SH.
Provided as, S _H 703 outputs an ON time of removal. An optional replacement nozzle can be attached to 703. 7
Reference numeral 06 denotes a filter, 707 denotes a fan motor, 708 denotes a discharge port for adjusting a recirculation rate, and 709 denotes a valve blade of a mode switching valve. At a position indicated by a solid line in the figure, recirculation is shut off from outside air and supplied to the head via a recirculation pipe 710. Is done. When the valve blade is rotated to a position indicated by a dotted line by an actuator such as an electromagnetic solenoid (not shown) at the ON output of either the floor sensor S _F or the hose sensor S _H , the return path to the head is closed, and the total return is performed. Are discharged to the outside air from the hole 711, and the pure suction mode is set. FIG. 6 shows an embodiment of the control circuit.

When the suction tube 704 is short or small, such as a crawl type, another replacement nozzle hose 904 as shown in FIG.
The coupling end 905 may be used by being inserted into a flow path of the main body. In this case, the hose sensor _SH is
N is output. In the upright type as shown in FIG. 5, the suction tube 704 has a sufficient length.
03 can be withdrawn from 702 and the replacement nozzle coupled to 703 for use. However, in the crawl type, the hose connecting the head and the filter chamber is short, and even if the replacement nozzle is connected as shown in FIG. 5, the hose is too short to be suitable for use. In many cases, the head and the filter chamber are connected by a rigid pipe instead of a hose.

In FIG. 7, reference numeral 901 denotes a part of a rigid flow path pipe in which the head is connected to the side 902 and the filter chamber is connected to the side 903. A hole (socket) which is shut off from the outside air by the door 907 as shown in FIG. Having. Reference numeral 904 denotes a replacement nozzle hose, and one end 906 has a replacement nozzle, for example, a gap cleaning nozzle 91.
The other end 905 is a connection end (plug) of the main body to the flow path. As shown in the figure, the plug 905 has a left side surface on the left side, but has a side wall removed on the right side and an opening communicating with the hose. To insert the plug 905 into the socket, the door 907 is pressed around the lower end of the plug 905 to rotate and open the door 907 around the rotation axis 908 in the direction shown by the arrow in FIG. 7A, and the plug 905 is opened as shown in FIG. 7B. insert. Remaining side wall of plug 905 and rotated door 90
7 closes the nozzle-side flow path 902, and the opening of the plug communicates with the filter-side flow path 903. That is, the flow path switching between the floor head and the replacement nozzle is performed only by the simple operation of inserting the plug 905 into the socket, and the handling of the user is simple,
It becomes an inexpensive structure. If the plug 905 is removed, the door 90
Reference numeral 7 denotes a spring (not shown) which is returned to the state shown in FIG. 7A. The cross section of the plug and socket may be circular or rectangular. In the case where the filter-side flow path 903 is substantially perpendicular to the nozzle-side flow path 902 and the flow path 903 is closed, only the end face of the plug 905 is opened, and the side wall remains all around. Structure. Replacement nozzle 910
When the plug 905 is inserted into the socket in order to use, the hose sensor S _H (micro switch) operates and outputs ON.

[Brief description of the drawings]

FIG. 1 is a perspective view of a horizontally recirculating head according to an embodiment of the present invention .
In the drawings showing the schematic structure , A is a plan view with a partial cross section, B
Is a diagram showing a part of each cross section of Z ₁ , Z ₂ , and Z ₃ of C;
3 is a sectional view taken along line Y ₁ of FIG.

FIGS. 2A to 2D are jets of the horizontal reflux head according to the present invention .
It is sectional drawing which shows the support structure of a part. E is jet structure
It is a perspective view which shows embodiment .

FIGS. 3A to 3C are microchambers of a flange according to the present invention .
It is a schematic sectional drawing which shows embodiment of a channel .

[4] A is a principle diagram of the bypass fan motor according to the present invention, B is a split type direct fan motor according to the present invention, is a flow path diagram of a reflux type using the same.

FIG. 5 is a configuration diagram of an apply-type recirculation cleaner showing an embodiment of recirculation control according to the present invention .

FIG. 6 shows an embodiment of a control circuit for reflux control according to the present invention .
It is a circuit diagram showing.

The connecting structure of the plug replacement nozzle engaging Ru in the present invention; FIG
In the cross-sectional view shown , A is a cross-sectional view with the plug removed, and B is
It is sectional drawing of a plug insertion state.

FIG. 8 is a cross-sectional view of a conventional reflux head.

FIG. 9 is a cross-sectional view of a conventional reflux head.

Continuation of the front page (56) References JP-A-7-67815 (JP, A) JP-A-48-74059 (JP, A) JP-A-54-6359 (JP, A) JP-A-58-22221 (JP, A) JP-A-55-153066 (JP, A) JP-A-54-158066 (JP, A) JP-A-48-84469 (JP, A) JP-A 4-350 (JP, U) JP-A 55-48475 (JP, U) JP-A 63-183945 (JP, U) JP-A 61-47964 (JP, U) JP 7-24643 (JP, B2) JP 7-44911 (JP, U) B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) A47L 5/14

Claims (3)

(57) [Claims] 1. A recirculating vacuum cleaner in which a wake of a fan of a fan motor is recirculated to a jet outlet arranged in a cleaning head, wherein the cleaning head has an air inlet at a substantially central portion in the left-right direction and extends left and right. A left and right slit-shaped jet spout having a spout provided on the lower surface of the cleaning head at a position substantially in the middle of the front and rear width of the cleaning head is provided in the horizontally extending cleaning head having a protruded space. A jet front chamber for temporarily storing the reflux in communication with the jet outlet to make the jet flow velocity distribution substantially uniform in the left-right direction is disposed in the cleaning head; Circulating air into approximately two ends of the front chamber of the jet to supply air near both right and left ends thereof. 2. A wake of a fan of the fan motor is connected to a return flow passage communicating with the jet outlet, and is sucked from a suction hole (509) from outside air, and the rotor of the motor of the fan motor is fixed. A cooling flow path that is cut off in a gas flow from the return flow path that passes through the gap between the elements and communicates with the outside through a discharge port (510) to the outside air; The recirculation type vacuum cleaner according to claim 1, further comprising a cooling fan that is pivotally supported. 3. A cooling flow path which is separated from the return flow path which communicates the wake of the fan of the fan motor to the jet outlet, and the return flow path which cools the motor of the fan motor and communicates with the outside. 2. The recirculation type vacuum cleaner according to claim 1, wherein the recirculation rate of the fan downstream of the fan motor is 85% or less and 60% or more.