JP2013111268A - Suction nozzle for vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure even if increasing an opening area of a suction port, and to improve cleaning efficiency by allowing the equalization of suction force before and after the suction port to prevent a situation that cleaning unevenness occurs.SOLUTION: This suction nozzle for a vacuum cleaner includes a body 1 which has a flow passage 3 surrounded by a wall part 2, and wherein the base end is configured as a connection port part 4 communicating with a suction hose of the vacuum cleaner and connected thereto. The lower side of the body 1 is formed with the suction port 5 formed in an elongated shape having a prescribed length along the long direction from the tip. The body 1 is formed so as to satisfy Sm=K×Qm and 1.2≤K≤2.5, wherein Qm is the opening area of the suction port 5 to an optional position m on a termination position b side from a tip position a of the suction port 5; and Sm is the cross section of the flow passage 3 in the optional position m.

Description

  The present invention relates to a vacuum cleaner suction nozzle that sucks dust such as dust by the suction force of the vacuum cleaner, and more particularly to a vacuum cleaner suction nozzle that can equalize the suction force before and after the suction port.

  Generally, in a vacuum cleaner, a detachable suction nozzle for a vacuum cleaner that is used with an increased suction force is provided. This suction nozzle has a main body surrounded by a wall and formed in a cylindrical shape, and has a connection port portion connected to a suction hose of a vacuum cleaner at the base end of the main body. It has an elongated suction port along the longitudinal direction from the tip. By the way, in this suction nozzle for a vacuum cleaner, it is conceivable to lengthen the opening length of the suction port so that a large area can be cleaned at a time. Since the suction force at the base end side of the mouth becomes stronger and the suction force at the distal end side of the suction port becomes relatively weak, there is a problem that the front and rear suction forces become uneven and uneven cleaning occurs.

  In order to solve this problem, there are various techniques. For example, a suction nozzle previously proposed by the applicant of the present application and published in Japanese Patent Laid-Open No. 2009-273510 is known. . As shown in FIG. 8, the suction nozzle Na includes a main body 100 having a flow path 102 surrounded by a wall portion 101, and is connected to a base end of the main body 100 in communication with a suction hose 103 of an electric vacuum cleaner. A suction port 105 having a connection port 104 is formed on the lower side of the main body 100. The suction port 105 is formed in an elongated shape having a predetermined length along the longitudinal direction from the tip. A partition wall 108 that divides the suction port 105 into a front suction port 106 and a rear suction port 107 is installed between a pair of side walls of the main body 100, and one end is connected to the rear end of the rear suction port 107. A partition wall 110 is formed so that the end rises toward the top wall side of the main body 100 and toward the upper wall side, and forms a suction opening 109 between the other end and the upper wall, and the suction opening is formed from the center of the front suction port 106. The length of the front intake passage 111 that reaches the center of 109 and the length of the rear intake passage 112 that extends from the center of the rear suction port 107 to the center of the suction opening 109 are substantially the same. As a result, when the vacuum cleaner is driven and dust such as dust is sucked from the suction nozzle Na, the lengths of the front intake passage 111 and the rear intake passage 112 are substantially the same by the partition wall 110 and the partition wall 108. As a result, the front suction port 106 and the rear suction port 107 have substantially the same suction force, so that the front and rear suction forces of the suction port 105 are equalized, resulting in uneven front and rear cleaning. Is prevented.

JP 2009-273510 A

However, in this conventional vacuum cleaner suction nozzle Na, since the partition wall 108 and the partition wall 110 are installed between the pair of side walls of the main body 100, the suction force before and after the suction port 105 is equalized. However, since the structure is complicated, there is a problem that the production is complicated and the cost is high.
The present invention has been made in view of such problems, and even if the opening area of the suction port is increased, the structure can be simplified so that the suction force before and after the suction port can be equalized, and cleaning unevenness is caused. An object of the present invention is to provide a suction nozzle for a vacuum cleaner that can prevent the situation from occurring and improve the cleaning efficiency.

In order to achieve such an object, the inventor of the present application has conducted experiments and researches for many years, and has invented a suction nozzle for a vacuum cleaner having the following structure. That is, a main body having a flow path surrounded by a wall portion and having a base end connected as a connection port connected to a suction hose of a vacuum cleaner is provided on the lower side of the main body in the longitudinal direction. In the suction nozzle for a vacuum cleaner in which a suction port formed in an elongated shape with a predetermined length is formed,
When the opening area of the suction port from the tip position a of the suction port to any arbitrary position m on the end position b side is Qm, and the cross-sectional area of the flow path at the arbitrary position m is Sm, the main body is defined as Sm = The configuration is such that K × Qm and 1.2 ≦ K ≦ 2.5.
However, the width of the suction port is H, the length from the tip position a of the suction port to an arbitrary position m is Lm, and the length from the tip position a of the suction port to a predetermined position c of the tip of the suction port Is at least Lc <Lm.
Here, the reason that Lc <Lm is used is that, depending on the shape of the tip of the suction port, it is impossible or impossible to create a relationship of Sm = K × Qm. . Of course, it is more desirable if the tip portion can be formed so that Sm = K × Qm and 1.2 ≦ K ≦ 2.5. Accordingly, the condition is satisfied in the flow path in the section from the position on the end position b side to the end position b slightly smaller than the predetermined position c.
If K is less than 1.2, unevenness occurs in the suction force before and after the suction port. If K exceeds 2.5, the shape balance becomes worse. Desirably, 1.3 ≦ K ≦ 2.2. More preferably, 1.4 ≦ K ≦ 2.1.

Thus, when cleaning using a vacuum cleaner suction nozzle, connect the connecting portion of the main body to the suction hose of the vacuum cleaner and drive the vacuum cleaner, for example, floors such as tatami mats and flooring, floor Move the suction port along the carpet on the surface, or insert it into a narrow space such as the back of the furniture. In addition to cleaning the floor surface, the suction port is moved along cloths such as a futon, a kotatsu rack, and clothes so as to suck dust such as dust. When the vacuum cleaner is driven, dust such as dust is sucked from the suction port and enters the main body of the vacuum cleaner through the connection portion, for example, a dust storage portion provided in the main body of the vacuum cleaner, etc. It is stored in.
In this case, as will be understood from the experimental example described later, the suction force is substantially the same over the entire length of the suction port of the main body, and therefore, the suction force before and after the suction port is equalized, so there is uneven cleaning before and after. The situation that occurs is prevented. In addition, when the suction force of the suction port is equalized, the suction force before and after the suction port is approximately equal and sufficient suction force is output to the tip of the suction port even if the opening length of the suction port is increased. The opening area can be increased, so that a large area can be cleaned at a time, and the cleaning efficiency can be improved.

  And as required, when the predetermined length from the tip position a to the end position b of the suction port is L, 6 mm ≦ H ≦ 12 mm, Lc = H ± 4 mm, 50 mm ≦ L ≦ 200 mm Yes. Desirably, 7.5 mm ≦ H ≦ 9 mm, Lc = H ± 2 mm, and 70 mm ≦ L ≦ 150 mm. Thereby, the shape balance of the main body becomes extremely good, and it can be made easy to use especially at home use.

  Further, if necessary, the main body is formed in a tapered shape at the distal end, and the suction opening is cut away in a direction in which the distal end portion of the main body is substantially perpendicular to the axis, and extends from the distal opening toward the proximal side. The configuration includes a general opening. As a result, for example, when inserted into a narrow space such as the back of furniture, the tip opening is at the tip of the suction nozzle, so the tip opening can be easily positioned at a dusty place, so that Suction can be performed easily.

  In this case, it is effective to set the boundary position d between the tip opening and the general opening as the predetermined position c. Since the size of the tip opening formed at the tip of the main body does not become so large, suction at the tip opening can be reliably held.

  Furthermore, if necessary, the longitudinal opening edge of the general opening closer to the base end side than the distal end opening is formed to be curved outwardly. As a result, the opening edge in the longitudinal direction of the general opening is curved outwardly so that it is in point contact with the suction surface, so that floors such as tatami mats and flooring, carpets laid on the floor, and futons , It becomes easy to move the suction port along cloth such as a kotatsu rack or clothes, and the cleaning efficiency is improved.

  According to the present invention, the suction force is substantially the same over the entire length of the suction port, and therefore, the suction force before and after the suction port is equalized, so that it is possible to prevent the occurrence of uneven cleaning before and after. . In addition, when the suction force of the suction port is equalized, the suction force before and after the suction port is approximately equal and sufficient suction force is output to the tip of the suction port even if the opening length of the suction port is increased. The opening area can be increased, so that a large area can be cleaned at a time, and the cleaning efficiency can be improved.

It is a perspective view which shows the suction nozzle for vacuum cleaners which concerns on embodiment of this invention. It is a bottom view which shows the suction nozzle for vacuum cleaners which concerns on embodiment of this invention. It is a side view which shows the suction nozzle for vacuum cleaners which concerns on embodiment of this invention. It is a cross-sectional view in the arbitrary positions which show the suction nozzle for vacuum cleaners which concerns on embodiment of this invention. It is a figure which shows the state which attached the attachment for suction nozzles of the vacuum cleaner to the suction nozzle for vacuum cleaners which concerns on embodiment of this invention. It is a figure which shows the measuring apparatus which concerns on the experiment example of this invention and measures the suction | attraction force of a suction nozzle. It is a graph which shows the attraction force distribution state of an Example and a comparative example according to the experiment example of this invention. It is a figure which shows an example of the suction nozzle for conventional vacuum cleaners.

Hereinafter, a vacuum cleaner suction nozzle according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
1 to 4 show a vacuum cleaner suction nozzle N according to an embodiment of the present invention. The main suction nozzle N has a flow channel 3 surrounded by a wall 2 and includes a main body 1 formed in a cylindrical shape with a tapered tip. The main body 1 is formed of, for example, plastic or a metal plate. The base end of the main body 1 is formed in a cylindrical shape, and is configured as a connection port portion 4 that is connected to and connected to a suction hose (not shown) of a vacuum cleaner. On the lower side of the main body 1, a suction port 5 formed in an elongated shape with a predetermined length along the longitudinal direction from the tip is formed.

  The suction port 5 includes a distal end opening 7 in which the distal end portion 6 of the main body 1 is cut in a direction substantially perpendicular to the axis P, and a general opening 8 extending from the distal end opening 7 to the proximal end side. In the embodiment, the boundary position d between the tip opening 7 and the general opening 8 is defined as the predetermined position c of the tip portion 6 of the suction port 5. The opening edge 9 in the longitudinal direction of the general opening 8 is convexly curved outward.

In the embodiment, the width of the suction port 5 is H, the predetermined length from the front end position a to the end position b of the suction port 5 is L, and the front end position 6 of the suction port 5 is extended from the front end position a of the suction port 5. When the length to the predetermined position c (d) is Lc, 6 mm ≦ H ≦ 12 mm, Lc = H ± 4 mm, and 50 mm ≦ L ≦ 200 mm. Desirably, 7.5 mm ≦ H ≦ 9 mm, Lc = H ± 2 mm, and 70 mm ≦ L ≦ 150 mm. In the embodiment, Lc = H is set.
Further, the longitudinal opening edge 9 of the general opening 8 has a radius of curvature R, for example, in a range of 200 mm ≦ R ≦ 2000 mm.

Further, the opening area of the suction port 5 from the front end position a of the suction port 5 to the arbitrary arbitrary position m on the end position b side is Qm, and the transverse area of the flow path 3 at the arbitrary position m (the flow path 3 perpendicular to the axis P). When the area of the surface is Sm, the main body 1 is formed so that Sm = K × Qm and 1.2 ≦ K ≦ 2.5. However, at least Lc <Lm.
Here, the condition of Lc <Lm is that it may or may not be possible to create a relationship of Sm = K × Qm depending on the shape of the distal end portion 6 with the distal end opening 7 of the suction port 5. This is because it is not easy. Of course, it is more desirable if the tip opening 7 can be formed so that Sm = K × Qm and 1.2 ≦ K ≦ 2.5. Thereby, the arbitrary position m is located between the predetermined position c (d) and the terminal position b, and is a section from the position closer to the terminal position b to the terminal position b than the predetermined position c (d). This satisfies the condition in the flow path.
If K is less than 1.2, the suction force before and after the suction port 5 is uneven. If K exceeds 2.5, the shape balance becomes worse. Desirably, 1.3 ≦ K ≦ 2.2. More preferably, 1.4 ≦ K ≦ 2.1.

  Therefore, when cleaning using the vacuum cleaner suction nozzle N according to this embodiment, the connecting portion of the main body 1 is connected to the suction hose of the vacuum cleaner and the vacuum cleaner is driven, for example, The suction port 5 is moved along a floor surface such as flooring or a carpet laid on the floor surface, or inserted into a narrow space such as the back of furniture. Further, in addition to cleaning the floor surface, the suction port 5 is moved along cloths such as a futon, a kotatsu rack, and clothes so as to suck dust such as dust. When the vacuum cleaner is driven, dust such as dust is sucked from the suction port 5 and enters the vacuum cleaner main body through the connection portion. For example, the dust storage portion provided in the vacuum cleaner main body And so on.

  In this case, as will be understood from an experimental example described later, the suction force is substantially the same over the entire length of the suction port 5 of the main body 1, so that the suction force before and after the suction port 5 is equalized. A situation in which uneven cleaning occurs is prevented. Further, when the suction force of the suction port 5 is equalized, the suction force before and after the suction port 5 is substantially equal even when the opening length of the suction port 5 is increased. Thus, the opening area of the suction port 5 can be increased, so that a large area can be cleaned at a time, and the cleaning efficiency can be improved.

  Further, since the main body 1 is provided with a tip opening 7 cut in a direction substantially perpendicular to the axis P, the tip opening 7 is the tip of the suction nozzle N when inserted into a narrow place such as the back of furniture. Therefore, it is easy to position the tip opening 7 at the position of dust in a narrow place, and therefore suction in a narrow place can be easily performed. In this case, since Lc = H ± 4 mm, in the embodiment, since Lc = H, the size of the tip opening 7 formed at the tip of the main body 1 does not become so large, so suction at the tip opening 7 is ensured. Can hold.

  Furthermore, since the longitudinal opening edge 9 of the general opening 8 of the suction port 5 is formed to be curved outward, the floor surface such as tatami mats and flooring, carpets laid on the floor surface, futons, kotatsu racks, clothes, etc. Therefore, it is easy to move along the suction port 5 and the cleaning efficiency is improved.

  Further, the vacuum nozzle suction nozzle N can be attached with the vacuum nozzle attachment (described in Japanese Patent No. 3459393) previously filed by the applicant of the present application for cleaning. In this case, it is particularly effective when cleaning cloths such as futons, kotatsu racks and clothes.

As shown in FIG. 5, the attachment S is composed of a spiral 21 having a size through which the suction nozzle N is inserted from the tip end portion 6, and includes a plurality of spirals 21 that are sequentially arranged at intervals. The attachment main body 20 which crosses the suction port 5 at the time of insertion is provided, and the attachment mechanism 22 for attaching the attachment main body 20 to the suction nozzle N is comprised.
This attachment is attached to the vacuum cleaner suction nozzle N of the present invention. For attachment, the distal end portion 6 of the suction nozzle N is inserted from the proximal end side of the attachment body 20, the suction nozzle N is inserted into the spiral 21, and attached by the attachment mechanism 22.

  In this state, the suction port 5 of the suction nozzle N is brought into contact with the part to be cleaned through the spiral 21 and the dust is sucked for cleaning. At this time, when the contact object that comes into contact with the suction nozzle N is cloth such as a futon, a kotatsu rack, or clothes, these flexible contact objects try to enter the suction port 5. A contact object to be sucked is separated from the suction port 5 and a gap is formed on both sides of the contact portion of the plurality of lines with respect to the contact object, and this gap functions as a relief valve. Therefore, a tension against the wind pressure is generated in the surface direction of the contact object and the contact object is stiffened. As a result, the contact object is prevented from being tightly attached to the suction port 5. That is, since a gap is secured between the contact object and the suction port 5, an inflow amount of air necessary for preventing the contact object from sucking the suction object 5 is secured, and the suction of the contact object is prevented, and cleaning is performed. It is possible to improve the slip when moving the surface to be moved, and to move freely to suck the dust.

  Even in this case, since the suction force of the suction port 5 of the vacuum cleaner suction nozzle N is equalized, it is possible to prevent the occurrence of uneven cleaning before and after the effect of the attachment S. Further, since the suction force of the suction port 5 is equalized, the opening area of the suction port 5 can be increased, so that a large area can be cleaned at a time, and this is combined with the effect of the attachment S. Thus, the cleaning efficiency can be improved.

Next, examples will be described.
Example 1
The main body 1 was formed in the shape described above. The width H of the suction port 5 is set to H = 8 mm, the predetermined length L from the tip position a to the end position b of the suction port 5 is set to L = 128 mm, and the tip position a and the predetermined position c (boundary position d). The length Lc was set to Lc = H = 8 mm. Then, the relational expression between the opening area Qm and the cross-sectional area Sm, Sm = K × Qm, was formed so that K = 1.5. However, when the length from the tip position a of the suction port 5 to the arbitrary position m is Lm, Lc <Lm. That is, the arbitrary position m is a position slightly smaller than the predetermined position c of the suction port 5 from the position on the end position b side to the end position b.

(Example 2)
The main body 1 was formed in the shape described above. The width H of the suction port 5 is set to H = 8 mm, the predetermined length L from the tip position a to the end position b of the suction port 5 is set to L = 128 mm, and the tip position a and the predetermined position c (boundary position d). The length Lc was set to Lc = H = 8 mm. Then, in the relational expression between the opening area Qm and the cross-sectional area Sm, Sm = K × Qm, K = 2. However, when the length from the tip position a of the suction port 5 to the arbitrary position m is Lm, Lc <Lm. That is, the arbitrary position m is a position slightly smaller than the predetermined position c of the suction port 5 from the position on the end position b side to the end position b.

And the comparative example 1 which performed the suction test with the comparative example was formed so that it might become K = 1 in the said Example 1,2. Comparative Example 2 is a commercially available nozzle with L = 40 mm, Comparative Example 3 is a commercially available nozzle, L = 50 mm, and Comparative Example 4 is a commercially available nozzle with L = 70 mm.
However, in Examples 1 and 2 and Comparative Example 1, the experiment was performed using the switch of the suction force strength of the vacuum cleaner used in the experiment, that is, using the standard. This is because a suction force suitable for a suction port that is significantly larger than a commercially available nozzle is used.
The site numbers of the suction ports were numbered from 1 to 12 in order of 10 mm intervals from the predetermined position c to the end position b, with the tip opening 7 being numbered 0.
Further, in the commercially available nozzles of Comparative Examples 2, 3 and 4, using the vacuum cleaner used in the experiments of Examples 1, 2 and Comparative Example 1, the switch of the suction force strength of this vacuum cleaner, This experiment was conducted using weakness. This is written in the manual of each manufacturer's vacuum cleaner equipped with the commercially available nozzles of Comparative Examples 2, 3 and 4 so that the suction force switch when using this type of nozzle is weakened. In addition, when the suction force switch of the vacuum cleaner actually used in the experiment was set to the middle, that is, when the commercially available nozzles of these comparative examples 2, 3 and 4 were used as standard, the vacuum cleaner used in the experiment This is because the suction pipe in the free-bent portion contracted abnormally, and the state of the vacuum cleaner became unusual.
In addition, in the case of the commercially available nozzles of Comparative Examples 2, 3, and 4, there was no clear suction port at the tip portion, and therefore there was no value of the site number 0 of the suction port.

The suction test was performed by creating a negative pressure measuring device F as shown in FIG. This device F places a container 30 containing water on the floor, uses a transparent, moderately elastic and rigid vinyl chloride hose 31 with an inner diameter of 3 mm, and puts one end of this hose into the container water and fixes it. The hose was set up about 2 meters vertically, hooked on the hook 32, turned back, and the other end was positioned near the floor. A memory 33 was attached to the hose 31 every 10 mm. Then, in each suction nozzle N according to the experiment, the other end opening of the hose 31 is sequentially applied to the part of each part number from the opening tip position a to the opening terminal position b of the suction port 5 to suck water in the container 30. Then, the water level (negative pressure at each part of the suction port 5) rising after being sucked was measured. In this principle, 1 hectopascal is obtained when the water level rises by 10 mm (one scale).
The results are shown in FIG. From this result, it can be seen that in Examples 1 and 2, the suction force is substantially the same over the entire length of the suction port 5, and therefore the suction force before and after the suction port 5 is equalized.

Next, before obtaining the above experimental results, the present inventor conducted various experiments and made trial and error. Describe the process.
The basic principle of the operation of the present invention is that the negative pressure generated by the vacuum cleaner, that is, the low atmospheric pressure, is extended to each part of the suction port 5 of the suction nozzle N. The suction nozzle N always has a passage for sucking air. The passage for sucking air is not considered as a suction passage, but is also considered as a negative pressure supply passage (flow path 3), and how this negative pressure supply passage is formed, the negative pressure of each part of the suction port 5 What is obtained by considering whether or not the suction nozzles N are substantially equal is the present device.
Now, assuming that a negative pressure is applied to the suction nozzle N by suction with a vacuum cleaner, the m from the point a to the m of the cross-sectional area Sm of the flow path 3 (negative pressure supply passage) at the point m What happens when the area Qm (= H × Lm) of the suction port 5 up to a point is sufficiently small is that the amount of air flowing to the back through the cross section of the negative pressure supply passage at the point m On the other hand, since the amount of air flowing in from the area Qm (= H × Lm) of the suction port 5 on the tip side from the point m is considered to be small, it is provided in the upper part of the suction nozzle N in the pipe by the difference. The air in the negative pressure supply passage on the tip side from the point m of the negative pressure supply passage is sucked from the cross section of the negative pressure supply passage at the point m. As a result, the negative pressure spreads throughout the negative pressure supply passage, and the suction nozzle N It protrudes to each part of the suction port 5.
In this case, the negative pressures appearing at the respective portions of the suction port 5 of the suction nozzle N become substantially equal, and the suction portion 5 of the suction nozzle N and the end portion of the suction port 5 of the suction nozzle N have substantially the same suction force. It is thought to have.
From now on, the meaning of the area Qm (= H × Lm) of the suction port 5 from the sufficiently small point a to point m with respect to the sectional area Sm of the negative pressure supply passage at point m for the suction nozzle N being considered. I thought it as a mathematical formula.

That is, as described above, the cross-sectional area of the negative pressure supply passage at the point m is Sm, the length from the point a to the point m is Lm, the width of the suction port 5 is H, and S = K × Qm = K × (H × Lm) ... (1)
Think of the formula.
Here, point m is an arbitrary distance from the point at the rear end b point side of the suction port 5 to the rear end b point of the suction port 5 slightly below the point c at the lower end of the suction port 5 of the suction nozzle N below the point a. This is the point.
In Equation (1), K is a proportional constant of the cross-sectional area Sm of the negative pressure supply passage at point m and the area Qm (= H × Lm) of the suction port 5 of the suction nozzle N from point a to point m.

Prior to this accurate experiment, according to a large number of preliminary experiments on various suction nozzles made of paper clay, from a point a that is sufficiently small with respect to the cross-sectional area Sm of the m-point negative pressure supply passage. In the meaning of the area Qm (= H × Lm) of the suction port 5 of the suction nozzle N up to m points, K is determined so that K is 2 ≦ K in the equation (1), and the cross-sectional area Sm is calculated. When the suction nozzle N is formed with the cross-sectional area Sm as the cross-sectional area Sm of the negative pressure supply passage at m points, it has been found that a substantially equal negative pressure can be obtained in each part of the suction port 5 of the suction nozzle N.
However, the suction nozzle N formed by determining K so that K> 2 and calculating the area Sm and using the area Sm as the cross-sectional area Sm of the negative pressure supply passage at the m point is the tip of the suction port 5. The purpose of overhanging a sufficient negative pressure and the purpose of giving a substantially equal negative pressure to each part of the suction port 5 of the suction nozzle N can be achieved, but the area Sm is calculated using a very large K. The suction nozzle N formed with the area Sm as the cross-sectional area Sm of the negative pressure supply passage at m points is too large and heavy, and is very difficult to use.

  Therefore, when the suction nozzle N is formed with the length of the suction port 5 in the longitudinal direction being about 200 mm or less, and in the experiment, about 128 mm or less, 1.0 ≦ K ≦ 2.5 in the expression (1). K was determined so that the area Sm was calculated, and the suction nozzle N was formed with the area Sm as the cross-sectional area Sm of the negative pressure supply passage at m points. Specifically, using the equation (1), K is K = 1, K = 1.5, and K = 2, and the cross-sectional area Sm of the m negative pressure supply passages is calculated. When an experiment was conducted with an experimental suction nozzle N having a suction port 5 having a cross-sectional area Sm of the negative pressure supply passage and having a width H of 8 mm, the experimental suction nozzle N with a K value of K = 2 was suctioned. The negative pressure at the front end portion 6 of the mouth 5 is substantially equal to the negative pressure at the rear end portion of the suction port 5, and the negative pressure at each portion of the suction port 5 is also substantially equal. Negative pressure was sufficient for practical use.

  Assuming that the value of K is K = 1.5 and the area Sm is calculated, the experimental suction nozzle N formed with the area Sm as the cross-sectional area Sm of the negative pressure supply passage at m points is the tip of the suction port 5. Although the negative pressure is smaller than the negative pressure at the rear end portion of the suction port 5, a practically sufficient suction force is obtained at the front end portion 6 of the suction port 5, and the difference in the negative pressure at each portion of the suction port 5 is also obtained. The practically sufficient ability was shown to the extent that there was no practical problem.

  Assuming that the value of K is K = 1, the area Sm is calculated, the area Sm is defined as the cross-sectional area Sm of the negative pressure supply passage of m points, the experimental suction nozzle N is a negative pressure at the tip 6 of the suction port 5. However, the pressure was significantly smaller than the negative pressure at the end portion of the suction port 5, and a practical suction force could not be obtained.

  The above experiment shows that in the equation (1), the value of K is set to 1.2 ≦ K ≦ 2.5 (1.5 ≦ K ≦ 2.0 in the experimental result only) with a margin, If the experimental suction nozzle N is formed, the balance of the negative pressure that appears at each part of the suction port 5 of the experimental suction nozzle N formed with the value of K being K = 1.5, and the value of K is K = 2. The negative pressure with a moderate balance between the negative pressure balances at the respective portions of the suction port 5 of the experimental suction nozzle N formed as follows: The value of K is 1.2 ≦ K ≦ 2.5. It is thought that it will come out to each part of the suction port 5 of the formed experimental suction nozzle N. Therefore, it is considered that the experimental suction nozzle N formed with the value of K being 1.2 ≦ K ≦ 2.5 is a suction nozzle N that generates a practically sufficient negative pressure at each part of the suction port 5.

  In the experimental suction nozzle N, by using the equation (1), the value of K is set to K = 1.5, the area Sm is calculated, and the sectional area Sm is the sectional area Sm of the negative pressure supply passage at m points. The experimental suction nozzle N formed as follows is connected to a suction pipe of a vacuum cleaner in a normal use state in which about one-fourth of dust is collected in a paper garbage pack. The vacuum cleaner is operated using the middle and weak switches, and the sand spilled on the floor is brought into contact with the floor only at the tip 6 of the suction port 5 and the other part of the suction port 5 is floated. As a result, the sand was sucked by the tip 6 of the suction port 5 without any problem.

  Further, when the suction nozzle N having the length L of the suction port 5 shorter than 128 mm is formed only by the experiment with the experimental suction nozzle N having the length L of the suction port 5 of 128 mm, the formula (1) is used. The condition 1.2 ≦ K ≦ 2.5 regarding K can be used because the length L of the suction port 5 of the suction nozzle N is shorter than 128 mm when the width of the suction port 5 of the suction nozzle N does not change. Then, the suction force of the suction port 5 of the suction nozzle N is stronger than the suction force of the suction port 5 having a length L of 128 mm, so that the suction force of the tip 6 is insufficient. This is because the inconvenience does not occur.

Moreover, the width H of the suction port 5 of the experimental suction nozzle N is set to 8 mm because sand for a large cat toilet, which is made by solidifying paper in actual cleaning, is added to the suction port 5. I thought of a range that would not cause a situation where it could get caught due to being caught, but there is also a theoretical reason described below.
Only the experimental result obtained by determining H in the formula (1) to 8 mm is shown, and the suction nozzle N for obtaining the formula (1) and the condition of 1.2 ≦ K ≦ 2.5 with respect to K by this device is shown. The reason for claiming that it is the formula for forming and the condition of K is as follows.
First, mathematically, the m point is infinitely smaller than the c point from the point on the b point side to the b point, and therefore, the cross section of the negative pressure supply passage at the m point is also infinite. The cross-sectional area Sm is also infinite, and the length Lm from point a to point m is also infinite. Equation (1) for concretely showing the situation in which the cross sections of all the negative pressure supply passages at m points infinitely suck the air in the negative pressure supply passage on the tip side from the point m, and H = The K condition obtained from the experiment of 8 was 1.2 ≦ K ≦ 2.5.

Actually, prior to finding the relational expression (1) between the cross-sectional area Sm of the cross section of the m point that is infinite at this time and the area Qm (= H × Lm) of the suction port 5 on the tip side from the m point. It is considered that “a negative pressure due to suction by the vacuum cleaner is applied to the suction nozzle N, and at that time, from the point a to the point m with respect to the cross-sectional area Sm of the negative pressure supply passage at the point m. When the area Qm (= H × Lm) of the suction port 5 of the suction nozzle N is sufficiently small ”.
In this sense, “when the area Qm (= H × Lm) of the suction port 5 of the suction nozzle N from the point a to the point m is sufficiently small with respect to the cross-sectional area Sm of the negative pressure supply passage at the point m”, The condition of 1.2 ≦ K ≦ 2.5 obtained by the experiment is the condition of K obtained by experimenting with H = 8 in the equation (1), but all m infinite. The cross section of the negative pressure supply passage at the point does not depend on the width H of the suction port 5 of the suction nozzle N in the meaning of the K condition for sucking air in the negative pressure supply passage on the tip side from the point m. It is clear that the condition of the proportionality constant K is between the area Sm and the area Qm (= H × Lm) in the equation (1).

  That is, when forming the desired suction nozzle N, using the formula (1), if the condition relating to K is 1.2 ≦ K ≦ 2.5 obtained in the above-described experiment, all arbitrary m points The cross-sectional area Sm of the negative pressure supply passage is K times the area Qm (= H × Lm) of the suction port 5 from the point m to the tip, and this K is 1.2 ≦ K ≦ 2.5. If so, the cross-sectional area Sm of the negative pressure supply passage at every m point sucks air in the negative pressure supply passage on the tip side from the m point, and as a result, regardless of the value of H, the suction port 5 of this suction nozzle N The negative pressure overhangs each part of (1) and the condition of 1.2 ≦ K ≦ 2.5 with respect to equation (1) and K is effective regardless of the value of H in order to form the desired suction nozzle N It is because it thinks.

  Further, even if considered as a practical problem, the width of the suction port 5 of the suction nozzle N that is actually sold varies depending on the portion of the suction port 5, but is about 5 mm to about 10 mm. In consideration of this, it is not necessary to consider the case where the width H of the suction port 5 of the suction nozzle N exceeds 12 mm, and when the suction nozzle N is formed with a constant width H, the suction nozzle actually sold. If it is N, the width of the suction nozzle N in which the width H of the suction port 5 is less than 6 mm is likely to cause dust to be caught, which is inconvenient. Since the width H of the suction port 5 of the suction nozzle N that is likely to be sold is considered to be about 7 mm to about 10 mm, the width H of the suction port 5 of the experimental suction nozzle N was determined as H = 8 mm. The condition of 1.2 ≦ K ≦ 2.5 regarding K in the expression (1) and the expression (1) is an expression and a condition of K that are practically effective when forming the desired suction nozzle N. Think.

  Further, when forming the suction nozzle N, changing the value of K depending on the position of the m point does not do this. When the suction nozzle N is formed, the width H of the suction port 5 is not changed from the tip a of the suction port 5 to the end b of the suction port 5. As a result, the suction nozzle N has a shape in which the area of the m point, that is, the cross-sectional area Sm of the negative pressure supply passage at the m point gradually increases without fluctuation from the front end of the suction port 5 toward the end of the suction port 5. Become. The shape of the suction nozzle N is such that there is no unfavorable vortex or circulation in the air flow flowing through the suction nozzle N to the vacuum cleaner in the back, and dust is conveyed to the vacuum cleaner without stagnation. This is a shape that does not cause a resonance phenomenon that causes inconvenient noise.

  In the above embodiment, the material of the suction nozzle N may be determined as appropriate.

N vacuum cleaner suction nozzle 1 body 2 wall 3 flow path 4 connection port 5 suction port 6 tip P axis 7 tip opening 8 general opening 9 opening edge a tip position b end position c predetermined position d boundary position m arbitrary Position H Width L Predetermined length from tip position a to end position b of suction port 5 Lc Length from tip position a of suction port 5 to predetermined position c (d) Lm Arbitrary position from tip position a of suction port 5 Length up to m Qm Open area from tip position a of suction port 5 to arbitrary position m Sm Cross-sectional area of flow path 3 at arbitrary position m K constant S Attachment 20 Attachment body 21 Screw 22 Mounting mechanism F Negative pressure measuring device 30 Container 31 Hose 32 Hook 33 Memory

Claims (7)

A main body having a flow path surrounded by a wall portion and having a base end connected as a connection port connected to a suction hose of a vacuum cleaner is provided along the longitudinal direction from the front end to the lower side of the main body. In a suction nozzle for a vacuum cleaner in which a suction port formed into an elongated shape having a predetermined length is formed,
When the opening area of the suction port from the tip position a of the suction port to any arbitrary position m on the end position b side is Qm, and the cross-sectional area of the flow path at the arbitrary position m is Sm, the main body is defined as Sm = A suction nozzle for a vacuum cleaner, which is formed so as to satisfy K × Qm and 1.2 ≦ K ≦ 2.5.
However, the width of the suction port is H, the length from the tip position a of the suction port to an arbitrary position m is Lm, and the length from the tip position a of the suction port to a predetermined position c of the tip of the suction port Is at least Lc <Lm.   The suction nozzle for a vacuum cleaner according to claim 1, wherein 1.3 ≦ K ≦ 2.2.   2. The predetermined length from the front end position a to the end position b of the suction port is set to 6 mm ≦ H ≦ 12 mm, Lc = H ± 4 mm, and 50 mm ≦ L ≦ 200 mm. Or the suction nozzle for electric vacuum cleaners of 2.   4. The suction nozzle for an electric vacuum cleaner according to claim 3, wherein 7.5 mm ≦ H ≦ 9 mm, Lc = H ± 2 mm, and 70 mm ≦ L ≦ 150 mm.   The main body is formed into a cylindrical shape with a tapered tip, and a suction opening is formed by cutting the suction port in a direction substantially perpendicular to the axis of the distal end of the main body, and a general opening extending from the distal opening toward the proximal side. The suction nozzle for an electric vacuum cleaner according to any one of claims 1 to 4.   6. The vacuum cleaner suction nozzle according to claim 5, wherein a boundary position d between the tip opening and the general opening is defined as the predetermined position c.   The suction nozzle for an electric vacuum cleaner according to claim 5 or 6, wherein a longitudinal opening edge of the general opening is formed so as to be convex outward.

Images