JP6575037B2 - Rotating nozzle - Google Patents

Description

  The present invention relates to a rotary nozzle used in a dehydrator or the like that blows off water droplets adhering to the outer periphery with a high-pressure gas, for example, in the course of transporting a pack containing food.

A rotating nozzle that injects high-pressure air while rotating is conventionally known.
For example, the rotating nozzle of Patent Document 1 shown in FIG. 8 is fixed to an inner ring of a ball bearing 3 incorporated in the holder 2 and a holder 2 screwed into an air supply pipe 1 connected to a compressed air source. And a rod-shaped rotating body 4. The rotating body 4 is rotatably supported with respect to the holder 2.
A through hole 5 communicating with the air supply pipe 1 is formed in the holder 2, and compressed air is supplied from the air supply pipe 1 to the rotating body 4 through the through hole 5.

The rotating body 4 is formed with a tapered portion 6, a linear passage 7, and three nozzle holes 8 that reduce the cross-sectional area along the air flow from the upstream side of the air flow by machining. Has been.
The nozzle hole 8 is a through hole having a base end opened to the passage 7 and a distal end opened to the distal end surface of the rotating body 4, and the three nozzle holes 8 are connected to the central axis x of the rotating body 4. They are arranged at predetermined intervals along the center circumference. Further, each nozzle hole 8 is disposed at a predetermined angle with respect to the central axis x, and the tip thereof is inclined in the circumferential direction of the rotating body 4 with respect to the base end.
Therefore, when compressed air is ejected from the tip of the nozzle hole 8, the reaction force generates a rotational moment along the inclination direction of the nozzle hole 8.

Further, the tapered portion 6 is formed with a spiral groove 6 a so that the compressed air supplied from the air supply pipe 1 is supplied to the nozzle hole 8 as a swirling flow. When the air supplied from the supply pipe 1 flows along the spiral groove 6a, a rotational moment is generated in the rotating body 4 along the rotational direction of the spiral groove 6a.
Thus, the rotating body 4 is rotated by the rotational moment due to the reaction force at the time of fluid ejection and the rotational moment due to the swirling flow, and air is ejected while the nozzle hole 8 is rotating.

Japanese Patent Laying-Open No. 2015-174013

The conventional rotary nozzle described above has a problem that the tapered portion 6, the passage 7 and the nozzle hole 8 must be formed by machining from the outer periphery of the rod-like member, and a complicated machining process is required for its manufacture. was there.
Further, as shown in FIG. 8, the passage 7 formed in the rotating body 4 is a narrow passage continuing to the tapered portion 6 that is tapered. Therefore, when the swirl flow formed by the tapered portion 6 is supplied to the three nozzle holes 8 branched from the passage 7, the flow rate of the compressed fluid supplied to all the nozzle holes 8 becomes uneven. May end up.
In particular, since the nozzle holes 8 are formed by machining, it is difficult to strictly manage the positions of the nozzle holes 8 with respect to the passage 7. If the position of any nozzle hole 8 deviates from the design position, the flow rate of the compressed air supplied to each nozzle hole 8 will be biased.

If the flow rate of the compressed air supplied to each nozzle hole 8 is different, the injection pressure is also different, and the magnitude of the reaction force due to the injection air is also different depending on the nozzle hole 8.
Thus, if the magnitude of the reaction force of the air to be injected is different, the center of the rotational moment due to this reaction force is deviated from the central axis x, and the rotating body 4 rotates eccentrically.
If the rotator 4 rotates eccentrically, an eccentric load acts on the ball bearing 3 supporting the rotator 4, and the ball bearing 3 tilts and wears, or smooth rotation is hindered. End up. That is, the conventional rotating nozzle has a problem that the life of the bearing member such as the ball bearing 3 is shortened and smooth rotation cannot be maintained unless it is frequently replaced.
An object of the present invention is to provide a rotating nozzle capable of maintaining a stable rotation over a long period of time by preventing an uneven load from acting on a rotating body and a bearing member while eliminating complicated machining.

This invention comprises a connection tube which is connected to a source of compressed fluid, with respect to the connecting tube consists of a separate member and rotating member which is rotatably supported via a bearing member, and the rotating body, the The rotating body includes a plurality of nozzle members radially attached to the rotating body and a central axis of the connection cylinder at a predetermined angle, and a fluid reservoir that is continuous with the connection cylinder is provided in the rotation body. When the compressed fluid is supplied to the nozzle member via the fluid reservoir, it is assumed that the rotating body is rotated by the reaction force of the fluid ejected from the ejection port.
The base end of the nozzle member opens into the fluid reservoir, and is provided at equal intervals on a first virtual circle centered on the central axis, and an injection port is formed on the tip end side of the nozzle member. In addition, the injection ports are provided at equal intervals on the second virtual circle centered on the central axis, and each nozzle member is an extension of the reaction force of the fluid injected from each of the injection ports All of the lines are arranged in a positional relationship that does not intersect with the central axis, and a flat mounting surface in which nozzle mounting holes corresponding to the nozzle members are formed is provided on the distal end side of the rotating body, the above nozzle member, a flange for positioning protruding outward is provided from the outer periphery, Ru this flange fixed to the mounting surface Empire.

Further, this invention, the bearing member is made of a relatively rotatable outer ring and the inner ring together with the rotating member is fixed to the outer ring, the connecting tube to the inner ring, characterized by comprising fixed .
The fixing of the rotating body and the outer ring, and the connecting cylinder and the inner ring include not only those that are directly fixed but also those that are indirectly fixed with another member interposed therebetween.

According to this invention, the compressed fluid, via a fluid reservoir would be supplied to a plurality of nozzle members, a difference in the supply flow rate and pressure to the nozzle member is less likely to occur. Therefore, the reaction force of the fluid ejected from each nozzle member becomes uniform, and the rotating body does not rotate eccentrically.
If the rotating body does not rotate eccentrically, an eccentric load does not act on the bearing member, and the life of the bearing member can be kept long. Therefore, the smooth rotation of the rotating body can be maintained without frequent replacement of the bearing member as in the prior art.
Moreover, in the present invention, since the rotating body and the nozzle member are separate members, it is sufficient to form a nozzle member mounting hole in the rotating body, and a fine machine for forming a passage inside the rotating body. No processing is necessary. In particular, if the direction of the nozzle member is appropriately determined, a rotational force can be obtained using a straight tubular nozzle member, so that the configuration of the nozzle member can be simplified.
Even if the mounting position of the nozzle member is slightly shifted, the error can be absorbed by the fluid reservoir for storing the compressed fluid, and the supply pressure of the compressed fluid to all the nozzle members can be kept uniform.

Further, by aligning the nozzle member with the nozzle mounting hole on the mounting surface, the nozzle member can be easily mounted at the target position.
  In addition, since the mounting angle of the nozzle member can be determined based on the flat mounting surface, the angle adjustment is easy. In particular, if the inclination of the mounting surface is formed in accordance with the target angle of each nozzle member, all the nozzle members are mounted as designed simply by mounting the nozzle members at a fixed angle with respect to the mounting surface. be able to.

  Furthermore, the positioning flange of the nozzle member can be brought into contact with a flat mounting surface, and the portion can be fixed by welding or adhesion. In this case, the contact area with the mounting surface is increased by the flange, so that the nozzle member and the rotating body can be firmly coupled.
  Moreover, the position of the said flange in each nozzle member can be made equal, and the protrusion length of the nozzle member which protrudes from an attachment surface can be arrange | equalized.

Further , since the rotating body rotates together with the outer ring having a larger diameter than the inner ring, the rotation center line is less likely to be inclined as compared with the case where the inner ring rotates. That is, the rotating body can be supported more stably.
In addition, when the fluid reservoir is formed inside while fixing the rotor to the inner circumference of the inner ring with a small inner diameter, the shape of the rotor is changed, for example, the cross-sectional area is changed between the fixed portion with the inner ring and the fluid reservoir. It becomes complicated. However, when the rotating body is fixed to the outer ring as in the present invention, the shape of the rotating body can be simplified.

1 is an external front view of a first embodiment of the present invention. It is a top view of a 1st embodiment. It is the III-III sectional view taken on the line of FIG. It is a conceptual diagram explaining the attachment position of the nozzle member of 1st Embodiment. It is a conceptual diagram explaining the attachment position of the nozzle member of 2nd Embodiment. It is a conceptual diagram explaining the attachment position of the nozzle member of 3rd Embodiment. It is sectional drawing of the reference example of this invention . It is sectional drawing of the conventional rotary nozzle.

1st Embodiment shown in FIGS. 1-4 is a rotary nozzle used for the dehydrator etc. which eject a compressed air and blow off a water droplet.
In this rotating nozzle, a cylindrical rotating body 12 is connected to a connecting cylinder 10 via a ball bearing 11 which is a bearing member of the present invention.
The connecting tube 10 is a member connected to a supply pipe (not shown) connected to a supply source of compressed air that is a compressed fluid. For example, the connecting tube 10 includes a screw portion 10a on one end side as shown in the drawing, and the screw portion 10a. Are connected to the air supply pipe.
As shown in FIG. 3, the inner periphery of the rotating body 12 is fixed to the outer ring 11a of the ball bearing 11, the outer periphery of the connecting cylinder 10 is fixed to the inner ring 11b, and the rotating body 12 connects the connecting cylinder 10 to the outer ring 11a. It is made rotatable at the center. Reference numeral 9 in the figure denotes a stopper ring that prevents the ball bearing 11 from shifting in the axial direction.

An air chamber 13 that is a fluid reservoir is formed inside the rotating body 12 so that compressed air supplied from the connection tube 10 side is accumulated therein.
Furthermore, a pair of planar attachment surfaces 14 and 15 formed by cutting out a part of the cylinder are formed on the outer peripheral surface on the distal end side of the rotating body 12. The attachment surfaces 14 and 15 are slopes formed on both sides of the central axis x of the rotator 12 and are slopes that maintain an angle α with respect to the central axis x. The mounting surfaces 14 and 15 are provided with nozzle mounting holes 14 a and 15 a communicating with the air chamber 13.

And the nozzle members 16 and 17 are attached to the said attachment holes 14a and 15a.
The nozzle members 16, 17 are the same shape, and are straight tubular metal members having proximal end side openings 16a, 17a and distal end side injection ports 16b, 17b. Further, flanges 16c and 17c for positioning according to the present invention are formed on the outer periphery so as to project in a direction perpendicular to the axis of the nozzle members 16 and 17.
The proximal ends of the nozzle members 16 and 17 are inserted into the mounting holes 14a and 15a, and the flanges 16c and 17c are fixed to the mounting surfaces 14 and 15 by, for example, welding. As described above, the mounting surfaces 14 and 15 are inclined by the angle α with respect to the central axis x, and the flanges 16c and 17c are orthogonal to the axis of the nozzle members 16 and 17, so that they are fixed to the mounting surfaces 14 and 15. The nozzle members 16 and 17 are provided in a radial manner with an angle β (= 90 ° −α) with respect to the central axis x. That is, the inclination angle of the nozzle members 16 and 17 can be set by the inclination angle of the mounting surfaces 14 and 15.

The attachment holes 14a and 15a are formed not at the center of the attachment surfaces 14 and 15 but at a biased position (see FIGS. 1 and 2). The positions of the nozzle members 16 and 17 fixed to the mounting holes 14a and 15a will be described with reference to FIG. FIG. 4 and FIGS. 5 and 6 showing the following embodiments are conceptual diagrams, and the dimensions and the like of each member are not accurately represented.
Further, in FIG. 4, the positions of the openings 16 a and 17 a on the base end side and the injection ports 16 b and 17 b on the tip end side of the nozzle members 16 and 17 are indicated by black dots at the center.

As shown in FIG. 4, the base end side openings 16a and 17a are provided at positions that bisect the first virtual circle S1 centered on the central axis x. Further, the ejection ports 16b and 17b are provided at a position that bisects the second virtual circle S2 larger than the first virtual circle.
That is, the base ends of the nozzle members 16 and 17 are provided at equal intervals on the first virtual circle S1, and the injection ports 16b and 17b are provided at equal intervals on the second virtual circle.
Furthermore, the axis of each nozzle member 16, 17 is provided at a position deviated from the central axis x.

  When compressed air is supplied to such nozzle members 16 and 17, compressed air is injected from the injection ports 16b and 17b in the direction of the broken arrows. The extension lines of the reaction forces F1 and F2 of this air are shown in FIG. As shown in FIG. 4, it does not intersect with the central axis x. Therefore, the reaction forces F1 and F2 have a couple relationship, and act on the rotating body 12 as the rotational force A centered on the central axis x, thereby rotating the rotating body 12.

In the first embodiment, since the air chamber 13 is formed in the rotating body 12, the compressed air supplied from the connection cylinder 10 is stored in the air chamber 13, and then each nozzle member 16, 17 will be supplied. Thus, since compressed air is supplied to each nozzle member 16 and 17 via the air chamber 13, compared with the case where compressed air is directly supplied to the nozzle members 16 and 17 from the said connection cylinder 10, for example. The supply flow rates to the nozzle members 16 and 17 are likely to be equal. If the flow rate of the compressed air is uniform, the magnitudes of the reaction forces F1 and F2 of the air injected from the nozzle members 16 and 17 are also equal. In addition, as described above, since each of the injection ports 16b and 17b is provided on the second virtual circle S2, the distance from the central axis line x is equal. As a result, the reaction forces F <b> 1 and F <b> 2 act in a balanced manner, and the rotating body 12 does not rotate eccentrically, and an eccentric load does not act on the ball bearing 11.
Therefore, as compared with the conventional example that does not include the air chamber 13, the bearing member such as the ball bearing 11 is not unevenly worn, and stable rotation can be maintained over a long period of time.

In the second embodiment shown in the conceptual diagram of FIG. 5, the shapes of the nozzle members 18 and 19 are different from the nozzle members 16 and 17 of the first embodiment. The nozzle members 18 and 19 of the second embodiment are not straight tubular members but are bent tubular members. In addition, the structure of the part which is not shown in figure is the same as the said 1st Embodiment. The same reference numerals as those in the first embodiment are used for the same components as those in the first embodiment.
The openings 18a and 19a on the base end side of the nozzle members 18 and 19 of the second embodiment are provided at positions that bisect the first virtual circle S1 centering on the central axis x of the rotating body 12. The mouths 18b and 19b are provided at a position that bisects the second virtual circle S2 centered on the central axis x.

And the linear part of the base end side of each nozzle member 18 and 19 is located on one diameter of the said virtual circles S1 and S2. As described above, the straight portions of the nozzle members 18 and 19 coincide with the diameters of the virtual circles S1 and S2, but since the nozzle bodies 18 and 19 are bent, the injection ports 18b and 19b intersect with the diameters. Suitable for. Therefore, the compressed air injected from these injection ports 18b and 19b is injected in a direction that does not match the diameter of the virtual circles S1 and S2, and the reaction forces F3 and F4 do not match the diameter. That is, the extension lines of the reaction forces F3 and F4 do not intersect the central axis x.
Further, the injection ports 18b and 19b are located on the virtual circle S2 and have the same distance from the central axis x. Accordingly, the reaction forces F3 and F4 act on the rotating body 12 as the rotational force A centered on the central axis x.

Also in the second embodiment, the air chamber 13 (see FIG. 1) formed in the rotating body 12 keeps the flow rate and pressure of the compressed air supplied to the nozzle members 18 and 19 equal, and the eccentricity of the rotating body 12. It is possible to prevent rotation and to prevent an unbalanced load from acting on the ball bearing 11.
Although not shown, also in the second embodiment, a flat mounting surface corresponding to the inclination angle of the axis of the nozzle members 18 and 19 with respect to the central axis x is formed on the distal end side of the rotating body 12. A flange (not shown) formed on the nozzle members 18 and 19 is fixed to the mounting surface.

The third embodiment shown in FIG. 6 is different from the first embodiment in that three nozzle members 20, 21, and 22 are attached to the rotating body 12. Therefore, a flat mounting surface (not shown) in which mounting holes are formed is formed on the distal end side of the rotating body 12 in order to mount the nozzle members 20, 21, and 22.
Other configurations are the same as those in the first embodiment, and the same reference numerals as those in the first embodiment are used for the same components as those in the first embodiment.
In this third embodiment, the openings 20a, 21a, 22a on the base end side of the nozzle members 20, 21, 22 are provided at positions that divide the first virtual circle S1 about the central axis x into three equal parts, The injection ports 20b, 21b, and 22b are provided at positions that divide the second virtual circle S2 into three equal parts.

The three nozzle members 20, 21, and 22 of the third embodiment are straight tubular members like the nozzle members 16 and 17 of the first embodiment, but their axis lines are the virtual circles S1, It arrange | positions so that it may not correspond with the diameter of S2.
In other words, the extension lines of the reaction forces F5, F6, and F7 of the compressed air injected from the injection ports 20b, 21b, and 22b of the nozzle members 20, 21, and 22 are all configured not to intersect the central axis x. ing.
Furthermore, since the injection ports 20b, 21b, and 22b are provided on the same virtual circle S2, the distances from the central axis line x are equal, so the reaction forces F5, F6, and F7 are centered on the central axis line x. It acts on the rotating body 12 as a rotational force A.

  Also in the third embodiment, the air chamber 13 (see FIG. 1) formed in the rotating body 12 keeps the flow rate of the compressed air supplied to the nozzle members 20, 21, 22 equal, and the rotating body 12. The eccentric rotation of the ball bearing 11 can be prevented from acting.

In the said 1st-3rd embodiment, the rotary body 12 which attached the nozzle member is fixed to the outer ring | wheel 11a of the ball bearing 11, and the outer ring | wheel 11a rotates with respect to the inner ring | wheel 11b. However, it is also possible to rotate the inner ring 11b.
For example, the reference example shown in FIG. 7 is a rotating nozzle in which the rotating body 23 is fixed to the inner ring 11 b of the ball bearing 11.
Flat attachment surfaces 24 and 25 are formed on the distal end side of the rotating body 23, and nozzle members 16 and 17 similar to those of the first embodiment are attached to attachment holes formed there. And the same code | symbol as 1st Embodiment is used for the same component as 1st Embodiment.

An air chamber 26 is formed inside the rotating body 23. A support cylinder portion 27 fixed to the inner ring 11 b of the ball bearing 11 is continuous with the rotating body 23.
On the other hand, a connecting cylinder 28 is fixed to the outer ring 11a. The upstream side of the connection tube 28 is used by connecting to a compressed air supply source (not shown).
In this reference example , the positional relationship between the nozzle members 16 and 17 and the direction of the reaction force F1 and F2 of the jet air are the same as those in the first embodiment shown in FIG. It acts on the rotating body 23 as a rotational force A centered on the central axis x.

Also in this reference example , the flow rate and pressure of the compressed air supplied to the nozzle members 16 and 17 are kept equal by the air chamber 26 formed in the rotating body 23, and the eccentric rotation of the rotating body 23 is prevented. It is possible to prevent an uneven load from acting on the bearing 11.
Even when a bent nozzle is used as in the second embodiment of FIG. 5 or when a nozzle member is disposed as in the third embodiment shown in FIG. 6, the rotating body is a ball bearing as in this reference example. 11 inner rings 11b.

However, if the rotating body is fixed to the outer ring having a diameter larger than that of the inner ring, the rotation axis is less likely to be tilted.
Further, when forming an air chamber having a sufficient capacity inside the rotating body, if the support cylinder 27 (see FIG. 7) for fixing to the inner ring is formed, the shape of the rotating body may be complicated. . If the rotating body 12 is fixed to the outer ring 11a as shown in FIG. 1, the shape of the rotating body can be simplified.

The number of nozzle members attached to the rotating body is not limited to that of the above-described embodiment, and may be any number as long as it is plural. This is because eccentric rotation of the rotating body can be prevented by arranging a plurality of nozzle members in a balanced manner on the rotating body provided with the air chamber.
On the other hand, even with a rotating body in which an air chamber is formed, if only one nozzle member is used, the reaction force of the air to be injected acts only in one direction, and therefore an unbalanced load acts on a bearing member such as a ball bearing. End up. Therefore, the bearing member is likely to be consumed.
Further, the planar mounting surface is not an essential element. However, there is an advantage that the nozzle member can be easily mounted at a predetermined angle if the mounting surface is maintained at a predetermined angle with respect to the central axis of the rotating body as in the above embodiment.
Furthermore, the fluid ejected from the nozzle member of the present invention is not limited to air. Gases other than air and liquids can be ejected.

In the above-described embodiment, the diameter of the second virtual circle S2 provided with the spout is larger than that of the first virtual circle S1 provided with the opening on the proximal end side of the nozzle member. The virtual circle S1 may be larger than the second virtual circle S2.
In this case, each nozzle member is inclined from the base end on the first virtual circle S1 toward the jet port on the second virtual circle S2 having a small diameter.

  The durability of the rotating nozzle for blowing off water droplets and dust of the cleaned product can be increased.

10, 28 Connecting cylinder 11 (Bearing member) Ball bearing 11a Outer ring 11b Outer ring 12, 23 Rotating body 13, 26 (Fluid reservoir) Air chambers 14, 15, 24, 25 Mounting surfaces 14a, 15a Mounting holes 16, 17, 18 , 19, 20, 21 and 22 the nozzle member 16a, 17a, 18a, 19a, 20a, 21a, 22a base end side of the opening 16b, 17b, 18b, 19b, 20b, 21b, 22b injection port 16c, 17c (for positioning ) Flange A rotational force x center axis S1 first virtual circle S2 second virtual circles F1 to F7 reaction force

Claims (1)

A connecting tube connected to a source of compressed fluid;
A rotating body that is rotatably supported via a bearing member with respect to the connection tube,
It consists of a separate member from this rotator, and consists of a plurality of nozzle members attached to the rotator at a predetermined angle with respect to the center axis of the rotator and the connecting cylinder,
In the rotating body, a fluid reservoir that is continuous with the connecting cylinder is provided,
When the compressed fluid is supplied to the nozzle member via the fluid reservoir, the rotating body rotates by the reaction force of the fluid ejected from the ejection port,
The bearing member is composed of an outer ring and an inner ring that are relatively rotatable,
The rotating body is fixed to the outer ring, and the connecting tube is fixed to the inner ring.
The proximal end of the nozzle member is opened in the fluid reservoir, and is provided at equal intervals on a first virtual circle centered on the central axis,
An injection port is formed on the tip side of the nozzle member, and the injection port is provided at equal intervals on a second virtual circle centered on the central axis.
Furthermore, each nozzle member is disposed in a positional relationship in which all the extension lines of the reaction force of the fluid ejected from each of the ejection ports do not intersect with the central axis,
A flat mounting surface in which nozzle mounting holes corresponding to the respective nozzle members are formed is provided on the distal end side of the rotating body,
Each nozzle member is provided with a positioning flange that protrudes outward from the outer periphery thereof, and the rotating nozzle is fixed to the mounting surface.

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