JPH0861847A - Dewaterer for umbrella - Google Patents

Abstract

PURPOSE: To prevent a dewatered component from scattering from a through- hole provided in a top plate of a casing without closing the hole. CONSTITUTION: A dewaterer for an umbrella is constructed such that there are provided a middle cylinder 3 into which a closed umbrella 11 is inserted and a blower 4 for blowing dewatering air P to a cloth part 13 of the umbrella 11 inserted into the middle cylinder 3 form the tip end side of the cloth to a base end side in the longitudinal direction, and water adhering to the cloth part 13 is blown off with the dewatering air P. In the dewaterer, there is provided shielding means 5 for producing air curtain Q flowing radially of the umbrella 11 at the base end of the umbrella 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rain umbrella dewatering device in which water adhering to a cloth portion of a rain umbrella is blown off by dewatering air blown from the tip side of the rain umbrella to be dehydrated.

[0002]

2. Description of the Related Art Conventionally, a rain umbrella dewatering device is one in which a closed rain umbrella is rotated about its axis and is dehydrated by centrifugal force (Japanese Patent Application Laid-Open No. 55-51276), or is rotated about its axis. There is one (for example, Japanese Utility Model Laid-Open No. 61-8451 gazette) in which hot air is blown from the outside in the radial direction to the cloth part of the umbrella in the closed state, which is disclosed in Japanese Utility Model Laid-Open No. 61-8451. Therefore, it is difficult for these means to properly dehydrate the water adhering to the valleys of the folds.

Therefore, a technique has been proposed in which dehydrated air is blown from the tip side to the rain umbrella in the closed state to dehydrate the rain umbrella. In this dehydrator, there is a middle cylinder into which the rain umbrella in the closed state is inserted. The cloth portion of the umbrella which is inserted into the middle cylinder is provided with a blower for blowing dewatering air from the front end side in the longitudinal direction toward the base end side, and the water adhering to the cloth portion is blown off by the dewatering wind. (JP-A-3-
148585, JP-A-3-148586).

[0004]

In the conventional dehydrator described above, the lower end of the middle cylinder is pivotally attached to the bottom of the casing whose upper part is closed by the top plate, and the middle cylinder protrudes forward of the casing. The posture of the middle cylinder is freely changeable between a detached posture and a dehydrated posture that fits in the casing. Therefore, in the dehydrated posture, the dehydrated water is blocked by the top plate and drained to the bottom of the casing, and is prevented from scattering above the casing.

However, in order to dehydrate the rain umbrella with such a dehydrator, the rain canopy is put into the inserted / removed middle cylinder, the middle cylinder is put into the dehydration posture, and then the middle cylinder is again inserted / removed when the dehydration process is completed. Since it is necessary to take out the rain umbrella in a posture, the work of setting the rain umbrella on the dehydrator is extremely complicated, and in this respect, the work time required for dehydration is considerably long.

Further, since the posture of the middle cylinder can be freely changed with respect to the casing, the size of the device becomes large,
There is a drawback that the manufacturing cost is high, and moreover, in the dehydrated position, the entire rain umbrella is stored in the casing, and the rain umbrella is completely separated from the hand of the person, so the tip of the rain umbrella is held at the lower end of the middle cylinder. It is necessary to provide a chucking means for this, which also leads to a high manufacturing cost.

Therefore, it is conceivable that the middle cylinder is fixed in the casing, the top plate of the casing is provided with an insertion / removal hole communicating with the middle cylinder, and the rain umbrella is inserted / removed through the insertion / removal hole.
However, when the dehydrated air is blown from the front end side in the longitudinal direction to the cloth portion of the umbrella in the closed state, the dehydrated water is scattered along with the dehydrated wind to the proximal end side of the umbrella. Simply by providing the top plate of the casing with the insertion / removal holes, the water content after dehydration is scattered from the insertion / removal holes and cannot be properly drained.

In view of such circumstances, the present invention prevents dehydrated water from splashing through the insertion / extraction holes of the rain umbrella without blocking the insertion / extraction holes provided in the top plate of the casing. The purpose of the present invention is to simplify the insertion / removal work and reduce the manufacturing cost of the dehydrator.

[0009]

In order to achieve the above object,
The present invention has taken the following technical means. That is, the first technical means adopted by the present invention is, in a casing, a middle cylinder into which a rain umbrella in a closed state is inserted, and a cloth portion of the rain umbrella inserted into the middle cylinder. A blower that blows dewatering wind from the side toward the base end side, and in the dewatering device for a rain umbrella that blows off the water adhering to the cloth portion by the dewatering wind, the rain umbrella at the base end portion of the rain umbrella It is the point that a shield means for generating an air curtain flowing in the radial direction is provided (Claim 1).

In this case, when it is desired to also serve as one blower, an air passage for supplying a part of the wind force of the blower for generating dehydrated wind to the shield means is provided (claim 2). A second technical means adopted by the present invention is, in a casing, a middle cylinder into which a rain umbrella in a closed state is inserted, and a cloth tip portion of the rain umbrella inserted into the middle cylinder. A blower that blows dewatering wind from the side toward the base end side, and in the dewatering device of the umbrella that blows off the water adhering to the cloth portion by the dewatering wind, the middle cylinder is in the closed state. The second cylinder, which is inclined in the opposite direction to the cloth portion, is connected to the base end side of the first cylinder, which is inclined in the same direction as the cloth portion, and the blown-off moisture is added to the first and second cylinders. The point is that a dehydration hole is provided for discharging the water with the dehydration wind to the outside of the cylinder (claim 3).

Both the first and second means can be adopted for one dehydrator (claim 4). Further, in the case of adopting the second technical means, for the reason to be described later, an intake passage communicating between the portion of the middle cylinder where the dehydration hole is provided and the intake port of the blower is provided. It is preferable to provide an eliminator in the middle of the process (Claim 5).

Further, an exhaust window may be provided in the ventilation passage communicating between the blower and the tip of the middle cylinder (claim 6).

[0013]

In the first technical means of the present invention, the shield means 5 generates the air curtain Q flowing in the radial direction of the rain umbrella 11 at the base end portion of the rain umbrella 11, and the air curtain Q is generated.
Prevents the dehydrated water from splashing to the base end side (upper side in FIG. 1) of the rain umbrella 11. On the other hand, according to the second technical means of the present invention, the moisture blown to the base end side of the rain umbrella 11 is discharged together with the dehydrated wind P from the dehydration hole 18 of the second cylindrical body 15 to the upper chamber 20, and the cloth portion If the wavy phenomenon occurs at 13,
As a result, the water separated from the cloth portion 13 is removed from the first cylindrical body 14
The water is discharged from the dehydration hole 17 into the upper chamber 20. in this way,
The water dehydrated in the middle cylinder 3 is discharged from the dehydration holes 17 and 18 to the outside of the cylinder, and the dehydrated water is prevented from jumping out from the insertion / removal hole 12 of the rain umbrella 11.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5, a rain umbrella dewatering apparatus 1 according to the present embodiment includes a casing 2, a middle cylinder 3 provided in the casing 2, and a blower 4 for supplying dewatering wind P to a lower end opening of the middle cylinder 3. , And shield means 5 for preventing the water after dehydration from being scattered by the air curtain Q above the casing 2.

The casing 2 is composed of a hollow box body having a substantially rectangular parallelepiped shape, and a top plate 7 and a bottom plate 8 are connected to the upper and lower ends of the side wall 6 framed in a rectangular shape. A semi-cylindrical outer cylinder portion 9 is formed on one side in the longitudinal direction (left side in FIG. 1) of the casing 2, and a lower portion of the side wall 6 on the other side in the same direction (right side in FIG. 1) is formed.
An exhaust door 10 in the shape of a shutter is formed. Further, a circular insertion hole 12 for inserting and removing the rain umbrella 11 into the casing 2 is formed in the top plate 7 of the casing 2 at a position coaxial with the outer cylindrical portion 9.

As shown in FIGS. 1 and 5, the middle cylinder 3 is a cylinder whose upper and lower ends are inserted into which the rain umbrella 11 in a closed state is inserted, and is coaxial with the outer cylinder portion 9 of the casing 2. It is provided like a heart. This middle cylinder 3 is the umbrella 1 in the closed state.
The first cylindrical body 14 having a truncated cone cylindrical shape inclined in the same direction as the first cloth portion 13 and the second cylindrical body 15 having a truncated cone cylindrical shape inclined in the opposite direction to the cloth portion 13, The two tubular bodies 15 are connected to the upper end side of the first tubular body 14 (the proximal end side of the rain umbrella 11).

The peripheral wall of the first cylindrical body 14 is slightly larger in diameter than the cloth portion 13 of the rain umbrella 11 in the closed state and is formed in a tapered shape substantially along the cloth portion 13. A passage 16 for the dehydrated wind P between the cloth portion 13 inserted inside
Are formed. The first cylinder 14 and the second cylinder 15 are provided with dewatering holes 17 and 18 for discharging the water blown off by the dewatering wind P to the outside of the cylinder. Of these, the dehydration hole 17 of the first tubular body 14 is an elongated hole that is long in the axial direction of the tubular body 14, and is provided in the upper half portion above the substantial center of the tubular body 14.

On the other hand, the second cylindrical body 15 of this embodiment is made of so-called punching metal, and the dehydration hole 18 of this second cylindrical body is used.
Is a round small hole having a smaller diameter than the tip of the bone of the rain umbrella 11, and is provided almost all over the outer peripheral wall of the second tubular body 15.
Since the dehydration hole 18 has a smaller diameter than the tip of the bone of the rain umbrella 11, the tip of the bone does not get caught in the dehydration hole 18 when the rain umbrella 11 is extracted after dehydration.

As shown in FIG. 1, the outer cylindrical portion 9 of the casing 2 is provided with an upper chamber 20 and a lower chamber 21 by a horizontal intermediate wall 19.
The first cylinder 1 is divided by the intermediate wall 10.
By supporting the central portion of 4 in an airtight manner, the middle cylinder 3 is fixed in the outer cylinder portion 9 with the lower end opening floating above the bottom surface of the lower chamber 21. In this case, the lower half portion of the first cylindrical body 14 not provided with the dehydration hole is arranged in the lower chamber 21, and the dehydration hole 1
The upper half of the first tubular body 14 provided with 7, 18 and the second tubular body 15 are arranged in the upper chamber 20. Also, FIG.
As shown in, the upper end opening edge of the middle cylinder 3 (second cylinder 14) is integrally fixed to the upper plate 20A of the upper chamber 20.

On the bottom surface of the lower chamber 21 and just below the lower end opening of the middle cylinder 3, there is provided a positioning tray 22 having an inner surface of an anti-conical shape for supporting the tip portion of the rain umbrella 11, and this positioning tray 22 A detection switch 23 including a limit switch for detecting the insertion of the tip of the rain umbrella 11 and starting the blower 4 is provided on the side. The detection means for starting the blower 4 can also be configured by a proximity switch provided on the side of the middle cylinder 3 or the optical sensor 24. When the detection means is provided at this position, a relatively short foldable type is used. It is suitable for detecting the rain umbrella 11.

On the other side of the lower part of the casing 2 (on the right side in FIG. 1), there is provided a ventilation box 25 for communicating the dewatering air P from the blower 4 to the lower chamber 21 of the outer cylinder portion 9. This ventilation box 25 The blower 4 is provided above. The blower 4 includes a fan box 26 arranged substantially in the center of the casing 2, a fan 27 rotatably provided in the box 26, and a motor 2 for driving the fan 27.
8, the fan 27 of the present embodiment is of a type that sucks air from the center of rotation and sends air radially outward.

Therefore, the fan box 26 is connected to an intake box 29 communicating with the other side (the right side in FIG. 1) of the upper chamber 20 of the outer cylinder portion 9, and an intake port 30 is provided on a side surface communicating with the intake box 29. Equipped with. As shown in FIGS. 3 and 4, a lower duct 31 communicating with the inside of the ventilation box 25 is provided in the lower part of the fan box 26, and an upper part communicating with the shield means 5 described later is provided in the upper part of the fan box 26. A duct 32 is provided, and a part of the wind force of the blower 4 that generates the dehydrated wind P by the upper duct 32 is supplied to the shield means 5.

The lower chamber 21 of the outer cylinder portion 9 is divided into left and right halves by a vertically oriented shielding plate 33 along the longitudinal direction of the casing 2 (see FIG. 4). The dewatering air P supplied to the inner cylinder 3 is allowed to enter the middle cylinder 3 through the lower end opening of the middle cylinder 3 without generating a vortex. As shown in FIGS. 1, 3 and 5, the shield means 5 is configured by providing a donut-shaped shield duct 34 on the upper portion of the outer tubular portion 9. The shield duct 34 is formed by fixing a short truncated cone-shaped inner wall 35 to the lower surface of the top plate 7 of the outer tubular portion 9, and the inner space of the inner wall 35 has the insertion / removal hole 12 of the rain umbrella 11 described above. I am configuring.

The lower end opening of the inner wall 36 is arranged slightly above the upper chamber 20 so that a slit 36 is formed between the lower end opening and the upper end opening of the upper chamber 20 (middle cylinder 3), and the shield is also provided. The upper duct 3 is provided on the outer peripheral portion of the duct 34.
2 are connected so as to face the tangential direction of the shield duct 34. Therefore, the blown air supplied from the upper duct 32 into the shield duct 34 enters the slit 36 while circulating in a cyclone shape in the duct 34 as shown in FIG. An air curtain Q that flows in the radial direction of the rain umbrella 11 is formed.

As shown in FIG. 6, the inner wall 35 is formed such that the lower end opening diameter thereof is slightly larger than the upper end opening diameter of the middle cylinder 3, whereby the tip of the bone when the rain umbrella 11 is pulled out. The part is prevented from being caught on the lower edge of the inner wall 35. The ventilation box 25 functions as a ventilation path that connects the lower duct 31 of the blower 4 and the lower end of the middle cylinder 3 in the lower chamber 21, and a heater 37 is provided in the middle of the ventilation box 25. . Therefore, blower 4
The dewatering wind P from is supplied to the lower chamber 21 after being heated by the heater 37, then enters from the lower end opening of the middle cylinder 3 and rises in the middle cylinder 3.

An exhaust window 38 having a shutter 38A whose opening can be adjusted is provided at a position corresponding to the exhaust port 10 on the other side surface (right side surface in FIG. 1) of the ventilation box 25. . On the other hand, the intake box 29
Functions as an intake passage that communicates between the portion of the middle cylinder 3 where the dehydration holes 17 and 18 are provided and the intake port 30 of the blower 4, and has an eliminator 39 in the middle thereof. As shown in FIG. 3, the eliminator 39 is formed by arranging a large number of obstruction plates 40 formed in a zigzag shape in a plan view at regular intervals, and casings the water removed by the obstruction plates 40. 2 is equipped with a drainage pipe 41 for discharging to the outside.

Reference numeral 42 shown in FIGS. 1 and 3 is a switch box having a switch for switching on / off of a main switch and a heater. Next, the operation of the dehydrator 1 will be described. First, when the rain umbrella 11 is inserted into the middle cylinder 3 through the insertion / removal hole 12 of the casing 2, the tip end of the rain umbrella 11 engages with the positioning plate 22, and the rain umbrella 11 is positioned coaxially with the middle cylinder 3. The detection switch 23 detects this and the blower 4 and the heater 28 are activated.

Then, the blower 4 has the upper and lower ducts 31, 3
Air is blown from each of the two, of which the dehydrated air P from the lower duct 31 is heated by the heater 3 in the ventilation box 25.
7 to the lower chamber 21, while the upper duct 32
The shield wind R from is supplied to the shield duct 34. As shown in FIG. 4, the dewatering wind P that has entered the lower chamber 21 is distributed to the left and right by the shield plate 33, enters the middle cylinder 3 through the lower end opening of the middle cylinder 3, and urges the passage 16 in the middle cylinder 3. Rises well.

Thus, the dewatering wind P is applied to the cloth portion 1 of the rain umbrella 11.
3 rises from the tip end side toward the base end side, the water adhering to the surface of the cloth portion 13 and the valleys of the folds is blown upward by the dehydration wind P, and when the speed of the dehydration wind P is high to some extent. The cloth portion 13 flutters inside and outside the diameter to cause a waviness phenomenon, and the water content also escapes from the cloth portion 13 due to the waviness phenomenon.

The wind speed of the dewatering wind P required to cause such waviness varies depending on the material of the cloth portion 13, but in the general rain umbrella 11 in which the cloth portion 13 is woven cloth, the lower end of the middle cylinder 3 About 20 m / s or more is required in the passage 16 of the part. The water released from the cloth portion 13 due to this waviness is discharged to the upper chamber 20 through the dehydration hole 17 of the first cylindrical body 14, while the water blown off to the base end side of the rain umbrella 11 is removed together with the dehydrated wind P. From the dehydration hole 18 of the two cylinders 15 to the upper chamber 2
It is discharged to 0. After that, dehydrated wind P containing such water
Is dehydrated by the eliminator 39 in the intake box 29 and returns to the intake port 30 of the blower 4.

In this case, the water dewatered in the middle cylinder 3 is discharged from the dewatering holes 17 and 18 in the upper chamber 20 outside the cylinder, so that the water after dehydration can escape from the insertion / removal hole 12 of the rain umbrella 11. Is prevented. In addition, the dehydrated wind P is the eliminator 39.
The dehydrated water is prevented from directly entering the blower 4, so that it is possible to prevent the moisture from being stirred up by the fan 27 to raise the humidity in the casing 2, and the durability of the fan 27 is improved. Will also be improved.

On the other hand, the shield wind R supplied to the shield duct 34 enters the slit 36 while circulating in the duct 34 as shown in FIG. 3, and forms an air curtain Q flowing in the radial direction of the rain umbrella 11. It is supplied into the middle cylinder 3.
Therefore, even if the water dewatered in the middle cylinder 3 tries to jump out upward, the air curtain Q seals or blows back the water, and the water is almost completely prevented from jumping out from the insertion hole 12 of the rain umbrella 11. To do.

The shield wind R is applied to the slit 3
After forming the air curtain Q at 6, it enters the inside of the middle cylinder 3 and is then discharged to the upper chamber 20 together with the dehydrated wind P.
As described above, in the dehydrator 1 of the present embodiment, the air blown by the blower 4 is circulated in the casing 2, so that the intake air is dehydrated by the eliminator 39 in order to prevent the humidity of the dehydrated air P from increasing. Although the dehydrated air P is heated by the heater 37, if the dehydrated air P is used excessively continuously, the humidity of the dehydrated air P may be saturated.

In that case, the exhaust window 3 of the ventilation box 25
If 8 is vacated, a part of the moist dehydrated wind P is discharged to the outside of the casing 2, but fresh air flows in from the insertion / removal hole 12, so that the circulating air in the casing 2 is replaced. Can be done. In the dehydration apparatus 1 according to the above embodiment, the shield means 5 which is the first means of the present invention.
And both of the middle cylinder 3 composed of the first and second cylinders 14 and 15 which is the second means are adopted, but only one of the means may be adopted. In particular, when only the shield means 5 is adopted, a stronger shield action is required than in the above embodiment. Therefore, when the output of the blower 4 for the dehydrated air P is insufficient, another blower needs to be provided.

The shield means 5 is not limited to the donut-shaped shield duct 34 described above, but may be constructed by fitting a ring-shaped ejection pipe having a large number of ejection holes inside the diameter into the insertion / removal hole 12. it can. What is essential is that the air curtain Q that flows in the radial direction of the rain umbrella 11 can be generated. It should be noted that the present invention is not limited to the above-described embodiments, and the gist of the present invention is shown by the claims, and includes all modifications that come within the meaning of those claims.

[0036]

As described above, according to the first means of the present invention, the air curtain Q by the shield means 5 prevents the water after dehydration from splashing to the base end side of the rain umbrella 11. It is possible to prevent the dehydrated water from scattering from the insertion / removal holes 12 provided in the top plate of the casing 2. Therefore, the dehydration work can be performed with the insertion / removal hole 12 left open, so that the rain umbrella 11 can be easily inserted / removed and the manufacturing cost of the dehydrator can be reduced (claim 1).

Further, according to the second means of the present invention, the water dehydrated in the middle cylinder 3 is discharged from the dehydration holes 17 and 18 to the outside of the cylinder, and the dehydrated water is transferred to the base end side of the rain umbrella 11. Since scattering is prevented, the rain umbrella 11 can be easily inserted and removed for the same reason as above, and the manufacturing cost of the dehydrator can be reduced (claim 3). In the case of adopting the first means, if the ventilation passage 32 for supplying a part of the wind force of the blower 4 that generates the dehydrated wind P to the shield means 5 is provided, the dehydrated wind P and the air curtain Q can be separated by one blower 4. Since both can be generated, the manufacturing cost of the dehydrator 1 can be reduced (claim 2).

When the second means is adopted, the eliminator 39 is provided in the intake passage 29 that communicates between the portion of the middle cylinder 3 where the dehydration holes 17 and 18 are provided and the intake port 30 of the blower 4. If provided, the water content after dehydration will be fan 2
It is possible to prevent the humidity inside the casing 2 from being increased by being agitated by the fan 7, and to improve the durability of the fan 27 (claim 5).

Furthermore, when an exhaust window 38 is provided in the ventilation passage 25 that connects the blower 4 and the tip of the middle cylinder 3, the circulating air in the casing 2 can be replaced with fresh air, thereby improving the dehydration efficiency. It can be improved (Claim 6).

[Brief description of drawings]

FIG. 1 is a side sectional view of a rain umbrella dehydrator.

FIG. 2 is a circuit diagram of the device.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB in FIG.

FIG. 5 is a side view of a middle cylinder.

6 is an enlarged cross-sectional view of a C circle portion of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dehydrator 2 Casing 3 Middle cylinder 4 Blower 5 Shielding means 11 Rain umbrella 12 Insertion / extraction hole 13 Cloth part 14 First cylinder 15 Second cylinder 17 Dehydration hole 18 Dehydration hole 25 Ventilation path (vent box) 29 Intake path (intake) Box) 30 Intake port 32 Ventilation path (upper duct) 38 Exhaust window 39 Eliminator P Dewatering air Q Air curtain

Claims (6)

[Claims] 1. A middle cylinder (3) in which a closed rain umbrella (11) is inserted, and a cloth portion of the rain umbrella (11) inserted in the middle cylinder (3) in a casing (2). Dehydration wind (P) from (13) to the base end side in the longitudinal direction.
A blower (4) for spraying with this dehydrated wind (P)
In a dehydrator for a rain umbrella, which is configured to blow off water adhering to the cloth portion (13) by an air curtain (Q) flowing in a radial direction of the rain umbrella (11) at a base end portion of the rain umbrella (11). A rain umbrella dewatering device, characterized in that shield means (5) for generating the rain umbrella is provided. 2. A blower (4) for generating dehydrated air (P)
The rain umbrella dewatering device according to claim 1, further comprising a ventilation path (32) for supplying a part of the wind force to the shield means (5). 3. A middle cylinder (3) into which a closed rain umbrella (11) is inserted, and a cloth portion of the rain umbrella (11) inserted into the middle cylinder (3) inside a casing (2). Dehydration wind (P) from (13) to the base end side in the longitudinal direction.
A blower (4) for spraying with this dehydrated wind (P)
A rain umbrella dewatering device configured to blow off water adhering to the cloth part (13) by means of a first cylinder in which the middle cylinder (3) is inclined in the same direction as the closed cloth part (13). A second cylinder (15) inclined in the opposite direction to the cloth part (13) is connected to the base end side of the body (14), and the first and second cylinders (14) and (15) are
A dewatering device for a rain umbrella, comprising dewatering holes (17) (18) for discharging the blown-out water together with the dewatering wind (P) to the outside of the cylinder. 4. The middle cylinder (3) is a cloth part (13) in a closed state.
The second cylinder (15) tilted in the opposite direction to the cloth part (13) is connected to the base end side of the first cylinder (14) tilted in the same direction as the first and second cylinders. Body (14) (15)
The dewatering device for a rain umbrella according to claim 1 or 2, wherein the dewatering holes (17) (18) for discharging the blown-out water together with the dewatering wind (P) to the outside of the cylinder are provided. 5. An intake passage (29) is provided which connects the portion of the middle cylinder 3 where the dehydration holes (17) (18) are provided with the intake port (30) of the blower (4). Intake passage (2
The rain umbrella dehydrator according to claim 4, wherein an eliminator (39) is provided in the middle of 9). 6. The rain umbrella dehydrator according to claim 5, wherein an exhaust window (38) is provided in a ventilation path (25) communicating between the blower (4) and the tip of the middle cylinder (3). .