JP2015070971A - Suction head and vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suction head and vacuum cleaner having an excellent removal performance of dust even on a carpet or the like despite of low power consumption of the vacuum cleaner.SOLUTION: A suction head 1 includes a bottom 20 opposite to a cleaned surface, a suction opening 10 in the bottom 20, a connector 4 connecting to the vacuum cleaner body side 71, a rear wall opening 12 communicating with the connector 4, and a suction chamber 21 communicating the suction opening 10 and the connector 4. The suction chamber 21 has a rear wall part 24c curving and rising into an arched shape from the suction opening 10 to the rear wall opening 12.

Description

  The present invention relates to a suction head used in a vacuum cleaner that sucks and removes dust on a surface to be cleaned, and a vacuum cleaner including the suction head.

  In recent years, an electric vacuum cleaner and its suction head for sufficiently removing dust on carpets and carpets (hereinafter referred to as carpets) have been proposed (for example, see Patent Document 1).

  According to such a vacuum cleaner, in order to sufficiently remove dust in the carpet or the like, an increase in the output of the electric blower for the purpose of improving the suction power by increasing the degree of vacuum in the main body of the vacuum cleaner, A rotary brush has been adopted for the purpose of improving the dust pickup rate in the suction head.

  However, increasing the power output of the electric blower increases the power consumption of the vacuum cleaner and has the disadvantages of increasing noise. In addition, the adoption of the rotating brush causes problems such as an increase in power consumption and noise by a motor for driving the rotating brush, an increase in size and weight of the suction head.

  In particular, there is a strong demand for power saving in recent years for home appliances, and it is required to sufficiently remove dust even on carpets and the like while suppressing power consumption in vacuum cleaners.

JP 2012-24497 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a suction head and a vacuum cleaner that have excellent dust removal performance even when using a vacuum cleaner with low power consumption or on a carpet or the like.

[Application Example 1]
The suction head according to this application example is
A bottom facing the surface to be cleaned;
A suction opening opening in the bottom;
A joint connected to the vacuum cleaner body side;
A suction chamber communicating with the joint, the rear wall opening communicating with the joint; and the suction opening and the joint;
Have
The suction chamber is a suction head having a rear wall portion that curves and rises in a bow shape from the suction opening portion toward the rear wall opening portion.

According to this application example, the suction chamber has the rear wall portion that rises in a bow shape from the suction opening portion toward the rear wall opening portion. A suction airflow that flows to This makes it possible to smoothly draw the dust wound up near the end of the suction opening to the rear wall opening. Therefore, a suction head having excellent dust removal performance can be realized even with low power consumption.

[Application Example 2]
In the above suction head,
The opening surface of the rear wall opening is preferably a surface whose normal vector has a horizontal component.

  According to this application example, since the opening surface of the rear wall opening is a surface whose normal vector has a horizontal component, the dust moved along the rear wall is effectively sucked into the rear wall opening. Can do. Therefore, a suction head having excellent dust removal performance can be realized even with low power consumption.

[Application Example 3]
In the above suction head,
The clearance between the surface to be cleaned and the bottom is preferably 0.3 mm or more and 1.5 mm or less.

  According to this application example, the gap between the surface to be cleaned and the bottom is not less than 0.3 mm and not more than 1.5 mm, so the flow rate of the suction fluid can be increased by the nozzle effect. Thereby, dust can be effectively wound up. Therefore, a suction head having excellent dust removal performance can be realized even with low power consumption.

[Application Example 4]
The vacuum cleaner according to this application example is
A vacuum cleaner body having an electric blower;
A cylindrical suction pipe connected to the vacuum cleaner body;
Any one of the above suction heads connected to the tip of the suction tube;
It is a vacuum cleaner provided with.

  According to this application example, since the suction head has excellent dust removal performance even with low power consumption, a vacuum cleaner having excellent dust removal performance even with low power consumption can be realized.

It is a perspective view of the vacuum cleaner concerning one Embodiment of this invention. It is a top view of the suction head concerning one embodiment of the present invention. It is a bottom view of the suction head concerning one Embodiment of this invention. It is a front view of the suction head concerning one Embodiment of this invention. It is AA sectional drawing in FIG. It is BB sectional drawing in FIG. It is a perspective view of the vacuum cleaner concerning other embodiments of the present invention. 4 is a graph in which the horizontal axis represents the gap H between the bottom of the suction head and the floor surface, and the vertical axis represents the dust pickup rate in “removing dust from a hard floor surface with grooves”. It is a graph which shows the relationship between a suction work rate and a dust pick-up rate.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The drawings used are for convenience of explanation. The embodiments described below do not unduly limit the contents of the present invention described in the claims. Also, not all of the configurations described below are essential constituent requirements of the present invention.

  FIG. 1 is a perspective view of a vacuum cleaner 70 according to an embodiment of the present invention. FIG. 2 is a plan view of the suction head 1 according to one embodiment of the present invention. FIG. 3 is a bottom view of the suction head 1 according to an embodiment of the present invention. FIG. 4 is a front view of the suction head 1 according to an embodiment of the present invention. 5 is a cross-sectional view taken along line AA in FIG. 6 is a cross-sectional view taken along the line BB in FIG.

  A suction head 1 according to an embodiment of the present invention includes a bottom portion 20 that faces a surface to be cleaned, a suction opening portion 10 that opens to the bottom portion 20, a joint 4 that is connected to the vacuum cleaner body 71 side, and a joint 4 A rear wall opening 12 that communicates, and a suction chamber 21 that communicates the suction opening 10 and the joint 4, and the suction chamber 21 extends from the suction opening 10 toward the rear wall opening 12. The suction head 1 has a rear wall portion 24c that curves up like a bow.

  Moreover, the vacuum cleaner 70 concerning one Embodiment of this invention is the vacuum cleaner main body 71 which has an electric blower, the cylindrical suction pipe 75 connected to the vacuum cleaner main body 71, and the front-end | tip of the suction pipe 75. A suction head 1 connected thereto.

  FIG. 1 is a perspective view of a vacuum cleaner 70 according to an embodiment of the present invention. FIG. 2 is a plan view of the suction head 1 according to one embodiment of the present invention. FIG. 3 is a bottom view of the suction head 1 according to an embodiment of the present invention. FIG. 4 is a front view of the suction head 1 according to an embodiment of the present invention. 5 is a cross-sectional view taken along line AA in FIG. 6 is a cross-sectional view taken along the line BB in FIG.

  As shown in FIG. 1, a vacuum cleaner 70 according to an embodiment of the present invention includes a vacuum cleaner body 71 having an electric blower (not shown), and a cylindrical suction tube 75 connected to the vacuum cleaner body 71. The suction head 1 connected to the tip of the suction pipe 75 is provided. The suction head 1 is connected to the vacuum cleaner 70 through a bellows-like hose 72 as a suction pipe 75 and a rigid synthetic resin extension pipe 73. The suction head 1 is connected to the front end of the extension pipe 73, the rear end of the extension pipe 73 has a handle 74, and the front end of the hose 72 is connected. The hose 72 is provided with a rigid synthetic resin connecting portion 76 at the rear end thereof, and the connecting portion 76 is connected to the electric vacuum cleaner main body 71.

  The hose 72 and the extension pipe 73 have a hollow cylindrical shape, and negative pressure is applied when the air inside is sucked and discharged by an electric blower (not shown) disposed inside the electric vacuum cleaner main body 71. Thus, a suction air flow can be generated in the suction head 1 and the suction pipe 75.

  The handle 74 is provided with an operation switch (not shown), and for example, operations such as turning on and off the electric blower and switching the strength of the suction force are possible. The user can operate by moving the suction pipe 75 and the suction head 1 with respect to the surface to be cleaned by grasping the handle 74.

  As shown in FIGS. 2 and 3, the suction head 1 includes a joint that is connected to the upper cover 1 a and the lower cover 1 b extending in the width direction of the suction head 1 and the extension pipe 73 of the electric vacuum cleaner main body 71 shown in FIG. 1. 4 and the shape in plan view is substantially T-shaped. In the present specification, the vertical direction is described with the floor surface side in the state where the surface to be cleaned is cleaned by the suction head 1 as the lower side, and the front and rear direction is described with the side with the joint 4 communicating with the extension pipe 73 as the rear side. The width direction will be described as a direction orthogonal to the front-rear direction and the vertical direction.

  The lower cover 1b is made of a synthetic resin and has a substantially rectangular frame shape with through holes penetrating vertically. The lower surface of the lower cover 1 b is the bottom 20 of the suction head 1. The opening on the bottom 20 side of the through hole of the lower cover 1 b is the suction opening 10.

  The upper cover 1a is made of synthetic resin and is placed and fixed like a lid that covers the through hole of the lower cover 1b from above. The upper surface of the upper cover 1 a is the upper wall portion 2 of the suction head 1. A projecting portion 2a extending from the upper wall portion 2 to the mounting portion 3 and projecting upward is formed at the center in the width direction of the upper cover 1a.

  The joint 4 is made of synthetic resin, and is attached so as to be sandwiched between the upper cover 1a and the lower cover 1b at the attachment portion 3 that is the central portion in the width direction of the suction head 1 and protrudes rearward. The joint 4 is rotatable about the longitudinal axis of the joint 4 with respect to the mounting portion 3.

  As shown in FIG. 3, the suction head 1 includes a bottom 20 that is a surface to be cleaned, for example, a floor surface (hereinafter, the surface to be cleaned is simply referred to as “floor surface”), and a suction opening 10 that opens to the bottom 20. And two front wheels 6 a in front of the bottom portion 20, and two rear wheels 6 b at the rear end of the mounting portion 3. A suction chamber 21 that communicates the suction opening 10 and the joint 4 is formed inside the suction head 1.

  The suction opening 10 is formed over the entire width direction of the suction head 1, and a suction force can be generated in the entire width of the suction head 1. The suction opening 10 has a front edge 10a on the front side of the suction head 1, side edges 10b and 10b on both ends in the width direction of the suction head 1, and a rear edge 10c on the rear side of the suction head 1. These connect to form an annular opening. The suction opening 10 is wide in the front-rear direction at the central portion of the suction head 1, and narrower in the front-rear direction at both end portions in the width direction of the suction head 1.

  The front edge 10a is formed so as to avoid the front wheels 6a, 6a arranged near both front ends of the suction head 1. The trailing edge 10 c is formed to extend linearly in the width direction of the suction head 1. The side edges 10b and 10b are portions that connect the front edge 10a and the rear edge 10c, and are shorter than the front edge 10a and the rear edge 10c. The side edges 10b and 10b have a suction groove 22 near the rear edge 10c. The suction groove 22 will be described later with reference to FIGS. 5 and 6, but the suction opening 10 is slightly formed on both sides of the suction head 1 and upward by forming the suction grooves 22 in the side edges 10 b and 10 b. spread.

  The bottom portion 20 is formed on the lower surface of the suction head 1 so as to surround the suction opening 10 and faces the floor surface. The bottom portion 20 includes a front end portion 20 a on the front side of the suction head 1, side portions 20 b and 20 b on both ends in the width direction of the suction head 1, and a rear end portion 20 c on the rear side of the suction head 1. The portions facing the suction opening 10 in the front end portion 20a, the side portions 20b and 20b, and the rear end portion 20c are the front edge 10a, the side edges 10b and 10b, and the rear edge 10c, respectively.

  The front wheels 6a, 6a are rotatably mounted near both ends in the width direction of the front end portion 20a, and can roll in the front-rear direction of the suction head 1. The rear wheels 6b and 6b are rotatably attached to the rear end of the attachment portion 3 and can roll in the front-rear direction of the suction head 1 in the same manner as the front wheels 6a and 6a.

The rear end portion 20 c can further include a raised portion 23. The raised portion 23 is a synthetic fiber that is raised from the rear end portion 20c toward the floor surface in the vicinity of the center in the width direction of the rear end portion 20c. The raised portion 23 may have a static electricity removing function that adsorbs dust such as a lint brush. The length in the width direction of the raised portions 23 can be 20 mm to 40 mm, and further can be 25 mm to 35 mm. The vicinity of the center of the rear end portion 20c in the width direction is located farthest from each of the wheels 6a and 6b, and is near the attachment portion 3 that is easily loaded by the joint 4 during cleaning. Therefore, by providing the raised portions 23 here, even if the suction head 1 has a small gap between the bottom portion 20 and the floor surface, the bottom portion 20 is deformed and the vicinity of the center of the rear end portion 20c directly contacts the floor surface. There is nothing. Accordingly, the raised portion 23 has a function of preventing the floor surface from being damaged by the rear end portion 20c coming into contact with the floor surface. The raised portions 23 are not shown in other drawings.

  As shown in FIG. 4, in the suction head 1, the front wheels 6 a and 6 a and the rear wheels 6 b and 6 b are grounded to the floor G during cleaning. There is a gap H between the floor G and the bottom 20. The gap H can be 0.3 mm or more and 1.5 mm or less, further 0.5 mm or more and 1.5 mm or less, and particularly 0.5 mm or more and 1.0 mm or less. If the suction power is constant, the dust pickup rate can be improved by reducing the gap H.

  The suction power is an index representing the ability to suck air in the vacuum cleaner, and is the maximum value of the aerodynamic power curve. Since the suction power is measured with the suction head removed, the performance of the suction head is not considered. The suction power is measured according to JIS C 9108 Annex A “Measurement Method of Suction Power” and is calculated by the following formula.

Suction work rate A (W) = 0.01666 × air volume Q (m ³ / min) × vacuum degree h _s (Pa)

  The dust pick-up rate can be measured according to JIS C 9802 “Performance measurement method for household vacuum cleaners” prepared based on the standard IEC 6031 established by the International Electrotechnical Commission. Represent. There are six measurement methods in JIS C 9802. In this embodiment, the dust pickup rate (%) is measured according to “removing dust from the carpet”. The measurement method for “removing dust from the carpet” is to suck the dust on the floor of the carpet at a constant speed, operation and frequency (5 reciprocations), and measure the amount of removed dust in percentage. To do.

  As shown in FIGS. 5 and 6, the suction chamber 21 formed inside the suction head 1 is a space that communicates the suction opening 10 and the joint 4. The suction chamber 21 has a wall portion 24 that rises upward from the suction opening 10. On the joint 4 side of the suction chamber 21, there is a rear wall opening 12 formed on the inner side of the mounting portion 3, and the air sucked from the suction opening 10 passes through the suction chamber 21 to the joint 4 from the rear wall opening 12. Can lead. The rear wall opening 12 is formed in a substantially circular shape by connecting the upper opening 12 a of the upper cover 1 a formed in the mounting portion 3 and the lower opening 12 b of the lower cover 1 b formed in the mounting portion 3. The

  The wall portion 24 of the suction chamber 21 is configured by a lower wall portion 25 of the lower cover 1b and an upper wall portion 26 of the upper cover 1a connected to the lower wall portion 25. The suction chamber 21 is formed by the upper wall portion 2 and the inner wall surface of the wall portion 24. The wall 24 includes a first front wall 24a and a second front wall 24d that rise upward from the front edge 10a of the suction opening 10, and a side wall 24b that rises upward from the side edge 10b of the suction opening 10. And a rear wall portion 24c that curves and rises in a bow shape from the suction opening portion 10 toward the rear wall opening portion 12. Further, in the example shown in FIG. 5, the rear wall portion 24 c extends horizontally from the rear edge 10 c of the suction opening 10 to the rear, and then rises gently curved upward. In the example shown in FIG. 5, the rear wall portion 24c is configured in a plate shape.

According to the present embodiment, the suction chamber 21 has the rear wall portion 24c that rises in a bow shape from the suction opening portion 10 toward the rear wall opening portion 12, so that the suction opening portion is compared with a case where the suction chamber 21 rises sharply. A suction airflow that smoothly flows backward from 10 can be generated. As a result, the dust rolled up near the end (rear edge 10 c) of the suction opening 10 can be smoothly drawn to the rear wall opening 12. Therefore, the suction head 1 having excellent dust removal performance can be realized even with low power consumption.

  The opening surface of the rear wall opening 12 (the surface passing through the upper opening 12a and the lower opening 12b) is preferably a surface whose normal vector has a horizontal component. In the example shown in FIG. 5, the opening surface of the rear wall opening 12 is a substantially vertical surface. That is, in the example shown in FIG. 5, the normal vector of the opening surface of the rear wall opening 12 is substantially horizontal.

  According to the present embodiment, since the opening surface of the rear wall opening 12 is a surface whose normal vector has a horizontal component, the dust that has moved along the rear wall 24c is effectively applied to the rear wall opening 12. Can inhale. Therefore, the suction head 1 having excellent dust removal performance can be realized even with low power consumption.

  The wall portion 24 has side wall portions 24 b and 24 b on both ends in the width direction of the suction head 1. The side wall parts 24b and 24b are plate-shaped bodies.

  The side wall portions 24 b and 24 b can have lower end portions whose lower ends are curved inward of the suction head 1 toward the suction opening 10.

  The side wall portion 24b has a suction groove 22 cut out at a predetermined width and height. The suction groove 22 appears well in FIG. 5 and FIG. 6, and the gap between the suction groove 22 and the floor surface G is larger than the gap H. Therefore, an air flow is generated from both ends in the width direction of the suction head 1 toward the center. To do.

  As shown in FIG. 6, the suction chamber 21 is formed over the entire width of the suction head 1, a suction opening 10 is opened below the suction chamber 21, and a rear wall opening 12 is located at the center rear of the suction chamber 21. Opens. The upper wall portion 2 has an inner surface forming the suction chamber 21 substantially flat except for the protruding portion 2 a and is parallel to the floor surface G. The bottom 20 of the lower cover 1b is particularly flat on the side facing the floor G except for the suction groove 22, and is parallel to the floor G with a slight gap H therebetween.

  Desirably, there is no bottom 20 protruding toward the floor G other than the front wheels 6a and the rear wheels 6b. For example, a rubber sheet can be provided behind the suction opening 10 so as to protrude from the bottom 20 to improve the dust pickup rate for particularly hard floors. Such a rubber sheet can be used on a carpet or the like. In order to inhibit the slidability, a suction head for carpet or the like must be prepared separately, and it is not preferable to employ the suction head 1 of the present embodiment. In addition, for example, there is a technique for adsorbing dust by providing a synthetic resin brush (so-called lint brush) brushed short around the suction opening 10 so as to protrude downward, but sliding on a carpet or the like. Therefore, it is not preferable to employ the suction head 1 of this embodiment. In addition, for example, a technique is generally used to increase the dust pickup rate by scraping dust by providing a rotating brush in the suction opening 10, but there are problems such as increased power consumption and noise. It is not preferable to employ the suction head 1 in the form.

  According to the suction head 1 according to the present embodiment, an excellent dust pickup rate can be achieved when the floor G is a carpet or the like. Moreover, according to the vacuum cleaner 70 concerning this embodiment, when the floor G is a carpet etc., the outstanding dust pick-up rate can be achieved.

The suction head 1 according to this embodiment is particularly advantageous for a battery-driven vacuum cleaner among the canister-type vacuum cleaners 70 shown in FIG. Since a battery-driven vacuum cleaner is required to be cleaned as long as possible with the electric power stored in the battery, it is necessary to achieve high dust removal even with low power consumption. By using the suction head 1 according to the present embodiment, a high dust pickup rate can be achieved even with a low suction work rate, that is, low power consumption, which is advantageous in a battery-driven vacuum cleaner.

  FIG. 7 is a perspective view of a vacuum cleaner 70a according to another embodiment of the present invention.

  As described above, the vacuum cleaner 70 has been described as a so-called canister type vacuum cleaner 70 in which wheels are provided on the vacuum cleaner body 71. However, as shown in FIG. It may be a so-called stick-type vacuum cleaner 70a that operates with one hand.

  A stick-type vacuum cleaner 70a shown in FIG. 7 is connected to a vacuum cleaner body 71a having an electric blower (not shown), a cylindrical suction pipe 75a connected to the vacuum cleaner body 71a, and a tip of the suction pipe 75a. A suction head 1. The suction pipe 75a is made of a synthetic resin having a hollow cylindrical shape and rigidity. A suction air flow can be generated in the suction head 1 and the suction pipe 75a by applying a negative pressure by sucking and discharging air inside the electric blower (not shown) disposed inside the vacuum cleaner body 71a. it can.

  An operation switch is provided on the handle 74a, and for example, operations such as turning on and off the power supply of the electric blower and switching the strength of the suction force are possible. A battery (not shown) can be provided inside the vacuum cleaner main body 71a. The user can hold the handle 74a and carry the electric vacuum cleaner 70a, and can move and operate the suction head 1 relative to the surface to be cleaned.

  The suction head 1 according to the present embodiment is particularly advantageous for a battery-driven vacuum cleaner among such stick-type vacuum cleaners 70a. In the stick-type vacuum cleaner 70a, the battery must be reduced in size as compared with the canister-type vacuum cleaner, so that a more efficient suction head 1 is required. Therefore, by using the suction head 1 according to the present embodiment for the stick type vacuum cleaner 70a, it is advantageous because a high dust pickup rate can be achieved even with low power consumption.

  Thus, according to the above-described embodiment, since the suction head 1 having excellent dust removal performance even with low power consumption is provided, the electricity having excellent dust removal performance even with low power consumption. The vacuum cleaner 70 and the electric vacuum cleaner 70a can be realized.

  Although the embodiments of the present invention have been described in detail as described above, those skilled in the art can easily understand that many modifications can be made without departing from the novel matters and effects of the present invention.

  The suction head described in the above embodiment is attached to a commercially available vacuum cleaner, and the gap H between the bottom and the floor is changed to 0.5 mm, 1.5 mm, and 2.5 mm. The dust pickup rate (%) was measured according to “Removal of dust from hard floor surface with grooves”. In the measurement method of “removing dust from hard floor surface with grooves”, suction is made by reciprocating the suction head 5 times with respect to the dust scraped on the hard floor surface with grooves, and the amount of dust removed is expressed as a percentage. Measured with. The measurement results are shown in FIG.

FIG. 8 is a graph in which the horizontal axis represents the gap H between the bottom of the suction head and the floor surface, and the vertical axis represents the dust pickup rate in “removing dust from a hard floor surface with grooves”. The graph shown with a round dot is the dust pickup rate when attached to a stick-type vacuum cleaner with power consumption of 120W, and the graph shown with a square dot is when attached to a stick-type vacuum cleaner with power consumption of 80W Dust pickup rate.

  According to FIG. 8, a dust pickup rate of 90% or more was shown in the suction head in which the gap H was set to 0.5 mm and 1.5 mm. Although not shown in FIG. 8, when the suction head is attached to a vacuum cleaner having a lower suction power, there is almost no change in the gap H of 0.5 mm, but when the gap H becomes 1.5 mm. There was a tendency for the dust pickup rate to decrease.

  The suction head described in the above embodiment was attached to a plurality of commercially available vacuum cleaners, and the dust pickup rate (%) was measured in accordance with “Removal of dust from carpet” in JIS C 9802. In the measurement method of “removing dust from the carpet”, the dust collected on the floor of the carpet was sucked back and forth with the suction head 5 times, and the amount of the removed dust was measured in percent. The measurement results are shown in Table 1 and FIG. 9 as Examples 1 to 4. In addition, the clearance H of the suction head at the time of measurement was 1 mm.

  In addition, the dust pickup rate of a commercially available vacuum cleaner made by another company was measured. All other vacuum cleaners used for measurement had a rotating brush on the suction head. The measurement results are shown in Table 1 and FIG. 9 as Reference Examples 1-9.

  The presence / absence of a rear wall portion that curves and rises from the suction opening portion toward the rear wall opening portion in the suction head of each vacuum cleaner is shown in Table 1 as “rear wall portion”.

  FIG. 9 is a graph showing the relationship between the suction power and the dust pickup rate. In FIG. 9, the horizontal axis represents the suction power (W) of a commercially available vacuum cleaner used in the experiment, and the vertical axis represents dust pickup ratio / suction power (% / W). The suction power is an index indicating the capacity of the main body of the vacuum cleaner, and the dust pickup rate tends to increase as the suction power increases. By determining the dust pickup rate / suction work rate (% / W), the capability of the suction head can be determined. The dust pickup rate / suction work rate (% / W) is B / A (%) in Table 1. In FIG. 9, Examples 1 to 4 are indicated by E1 to E4, and Reference Examples 1 to 9 are indicated by R1 to R9.

  As shown in Table 1, the vacuum cleaners equipped with the suction heads of Examples 1 to 4 were superior to the vacuum cleaners of Reference Examples 1 to 9 in terms of the dust pickup rate per unit suction work rate.

  Furthermore, when the dust pick-up rate when the rotary brush was driven and stopped using the electric vacuum cleaner of Reference Example 9 was measured, the dust pick-up rate was reduced by about 10%.

  As mentioned above, although this embodiment or the modification was demonstrated, this invention is not limited to these this embodiment or a modification, It is possible to implement in a various aspect in the range which does not deviate from the summary.

  The present invention includes configurations that are substantially the same as the configurations described in the embodiments (for example, configurations that have the same functions, methods, and results, or configurations that have the same objects and effects). In addition, the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. In addition, the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same object. In addition, the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

DESCRIPTION OF SYMBOLS 1 ... Suction head, 1a ... Upper cover, 1b ... Lower cover, 2 ... Upper wall part, 2a ... Projection part, 3 ... Mounting part, 4 ... Joint, 6a ... Front wheel, 6b ... Rear wheel, 10 ... Suction opening DESCRIPTION OF SYMBOLS 10a ... Front edge, 10b ... Side edge, 10c ... Rear edge, 12 ... Rear wall opening part, 12a ... Upper opening part, 12b ... Lower opening part, 20 ... Bottom part, 20a ... Front end part, 20b ... Side part , 20c ... rear end portion, 21 ... suction chamber, 22 ... suction groove, 23 ... raised portion, 24 ... wall portion, 24a ... first front wall portion, 24b ... side wall portion, 24c ... rear wall portion, 24d ... second Front wall portion, 25 ... lower wall portion, 26 ... upper wall portion, 70 ... vacuum cleaner, 70a ... vacuum cleaner, 71 ... vacuum cleaner body, 71a ... vacuum cleaner body, 72 ... hose, 73 ... extension pipe 74 ... handle, 74a ... handle, 75 ... suction tube, 75a ... suction tube, 76 ... connection part, G ... floor surface, H ... gap Ha ... the height of the suction groove

Claims (4)

A bottom facing the surface to be cleaned;
A suction opening opening in the bottom;
A joint connected to the vacuum cleaner body side;
A suction chamber communicating with the joint, the rear wall opening communicating with the joint; and the suction opening and the joint;
Have
The suction chamber has a rear wall portion that curves and rises in a bow shape from the suction opening portion toward the rear wall opening portion. The suction head according to claim 1,
The opening surface of the rear wall opening is a suction head in which a normal vector has a horizontal component. The suction head according to claim 1 or 2,
The suction head, wherein a gap between the surface to be cleaned and the bottom is not less than 0.3 mm and not more than 1.5 mm. A vacuum cleaner body having an electric blower;
A cylindrical suction pipe connected to the vacuum cleaner body;
The suction head according to any one of claims 1 to 3, connected to a tip of the suction pipe;
A vacuum cleaner comprising: