JP7006526B2 - Liquid sprayer - Google Patents

Description

The present invention relates to a liquid injection device.

Conventionally, a liquid injection device in which a nozzle is attached to the tip of a shaft has been used in order to make it possible to inject a fluid to be injected from a nozzle in a wider range. For example, in Patent Document 1, the tube is pivotally supported with respect to the rotating body at a position displaced from the center of rotation, and the rotating body is rotated around the center of rotation to provide a nozzle connected to the tip of the tube. It is rotating. According to such a liquid injection device, since the nozzle can be rotated without using a rotary seal or the like, it is suitable for injecting a liquid such as liquid nitrogen at an extremely low temperature.

Japanese Patent Publication No. 2012-533422

By the way, the liquid injection device can be used for various purposes such as processing concrete and peeling of a lining material, but the work is generally performed by an operator. Therefore, in order to improve workability and the like, the rotating body is surrounded by a casing. Since the casing does not rotate unlike the rotating body, a gap is provided between the rotating body and the casing. If foreign matter such as dust generated by the work intrudes into this gap, the foreign matter may hinder the smooth operation of the bearing or the like that supports the rotating body.

The present invention has been made in view of the above-mentioned problems, and in a liquid injection device including a rotating body and a casing surrounding the rotating body, it is possible to prevent foreign matter from entering the depth of the gap between the rotating body and the casing. The purpose is to do.

The present invention adopts the following configuration as a means for solving the above problems.

The first invention comprises a rotating body that is rotated around a rotating shaft center, a casing that surrounds the rotating body with a gap from the radial outside of the rotating shaft center with respect to the rotating body, and a rotating shaft center. A liquid injection device including a nozzle for injecting fluid in a direction along the As a result, a configuration is adopted in which a flange portion is provided to prevent foreign matter from entering the inner part of the gap.

In the second invention, in the second invention, the rotating body extends forward from the tip opening of the gap to the front in the injection direction of the fluid, and the flange portion is viewed from the direction along the axis of rotation. A configuration is adopted in which the gap is covered and the rotating body is provided at the front end of the rotating body.

In the third aspect of the invention, in the first or second invention, a through hole through which a supply tube for supplying the fluid is passed to the nozzle is provided in the tip wall of the rotating body, and the supply tube is pivotally supported. At the same time, a configuration is adopted in which a tube holding mechanism having the flange portion arranged in front of the through hole in the injection direction of the fluid is provided.

The fourth invention adopts the configuration in which the compressed air supply unit for supplying compressed air to the gap is provided in any one of the first to third inventions.

A fifth aspect of the present invention comprises an air drill that generates power to rotate the rotating body by supplying compressed air in the fourth aspect of the present invention, and the compressed air supply unit compresses the air drill and the gap between the air drill and the gap. Adopt a configuration that supplies air.

The sixth invention includes, in any one of the first to fifth inventions, a rotary blade train that is arranged inside the gap and pumps air from the inner side of the gap toward the tip opening of the gap. The configuration is adopted.

According to the present invention, a flange portion for preventing foreign matter from entering the inner part of the gap is provided in front of the gap between the rotating body and the casing surrounding the rotating body from the outside in the radial direction or inside the gap. Therefore, according to the present invention, it is possible to prevent foreign matter from entering the deep part of the gap and prevent harmful effects caused by the foreign matter entering the gap.

It is sectional drawing of the liquid injection apparatus in 1st Embodiment of this invention. It is an enlarged view of the area A of FIG. It is an enlarged sectional view of the region including the tube holding mechanism provided in the liquid injection device in one Embodiment of this invention. It is sectional drawing of the liquid injection apparatus in 2nd Embodiment of this invention. It is sectional drawing of the liquid injection apparatus in 3rd Embodiment of this invention. It is sectional drawing of the liquid injection apparatus in 4th Embodiment of this invention.

Hereinafter, an embodiment of the liquid injection device according to the present invention will be described with reference to the drawings.

(First Embodiment)
FIG. 1 is a cross-sectional view of the liquid injection device 1 according to the first embodiment of the present invention. Further, FIG. 2 is an enlarged view of a tip region (region A in FIG. 1) of the liquid injection device 1. In the present embodiment, the liquid injection device 1 injects liquid nitrogen X. However, the fluid injected by the liquid injection device of the present invention is not limited to liquid nitrogen. As shown in FIG. 1, the liquid injection device 1 of the present embodiment includes a casing 2, a rotating unit 3, a supply tube 4, a nozzle unit 5, a tube holding mechanism 6, an air drill 7, and a power transmission mechanism 8. And have.

The casing 2 houses the rotating unit 3 and the supply tube 4, and is, for example, a portion that can be gripped by an operator at least in part. In the present embodiment, the casing 2 has a rotating body accommodating portion 2a, a transmission mechanism accommodating portion 2b, and a tube insertion portion 2c. The rotating body accommodating portion 2a is a cylindrical portion in which the rotating unit 3 is accommodated. The central axis of the rotating body accommodating portion 2a is arranged so as to overlap the rotation axis L of the rotating unit 3, the root side is fixed to the transmission mechanism accommodating portion 2b, and the tip end side is an open end. A gap S in which the front end side bearing 3a and the rear end side bearing 3b, which will be described later, are accommodated is provided between the rotating body accommodating portion 2a and the rotary cylinder 3c described later of the rotating unit 3. This gap S is provided along the rotation axis L, and is opened toward the front when the direction in which the liquid nitrogen X is injected from the nozzle is the front in the direction along the rotation axis L. It has a tip opening S1 (see FIG. 2).

The transmission mechanism accommodating portion 2b is a portion accommodating the power transmission mechanism 8. As shown in FIG. 1, the rotating body accommodating portion 2a is fixed to the upper end portion of the transmission mechanism accommodating portion 2b, and the lower end portion is used as a mounting location for the air drill 7. Further, an opening 2b1 through which the supply tube 4 can pass is provided at the upper end of the transmission mechanism accommodating portion 2b.

The tube insertion portion 2c is a tubular portion through which the supply tube 4 is inserted, and is fixed to the upper end portion of the transmission mechanism accommodating portion 2b from the side opposite to the transmission mechanism accommodating portion 2b. The tube insertion portion 2c has a closed end on the rear end side and an open end on the distal end side, and is concentric with the transmission mechanism accommodating portion 2b when viewed from the direction along the rotation axis L. Is located in. The tube insertion portion 2c is fixed to the transmission mechanism accommodating portion 2b so that the open end on the distal end side is connected to the opening 2b1. Further, the closed end on the rear end side of the tube insertion portion 2c holds the supply tube 4. That is, the middle portion of the supply tube 4 is fixed to the rear end portion of the tube insertion portion 2c of the casing 2.

The casing 2 having such a rotating body accommodating portion 2a, a transmission mechanism accommodating portion 2b, and a tube inserting portion 2c is formed of, for example, a resin material having a heat insulating property, and is formed of a liquid nitrogen X flowing through the supply tube 4. It suppresses the transfer of cold heat to the operator.

The rotating unit 3 is housed inside the rotating body accommodating portion 2a of the casing 2, and includes a front end side bearing 3a, a rear end side bearing 3b, a rotating cylinder 3c (rotating body), and a counter mass unit 3d. ing. The front end side bearing 3a is a bearing arranged closer to the tip end of the rotating body accommodating portion 2a than the rear end side bearing 3b. In this tip side bearing 3a, the outer ring is fixed to the inner peripheral surface of the rotating body accommodating portion 2a, and the inner ring is fixed to the outer peripheral surface of the rotating cylinder 3c, so that the rotating cylinder 3c can rotate around the rotation axis L. I support it. The rear end side bearing 3b is a bearing arranged closer to the root of the rotating body accommodating portion 2a than the front end side bearing 3a. In the rear end side bearing 3b, the outer ring is fixed to the inner peripheral surface of the rotating body accommodating portion 2a, the inner ring is fixed to the outer peripheral surface of the rotating cylinder 3c, and the rotating cylinder 3c can rotate about the rotation axis L. I support it.

The rotary cylinder 3c is a tubular portion in which the end portion on the distal end side is a closed end closed by the distal end wall 3c1 and the end portion on the rear end side is an open end. In this rotary cylinder 3c, the tip wall 3c1 is arranged slightly forward from the tip of the rotating body accommodating portion 2a, and the end portion on the rear end side faces the opening 2b1 provided in the transmission mechanism accommodating portion 2b of the casing 2. As described above, it is pivotally supported by the front end side bearing 3a and the rear end side bearing 3b. As shown in FIG. 1, a supply tube 4 is inserted through the rotary cylinder 3c.

As shown in FIG. 2, the tip wall 3c1 is provided with a penetrating portion 3c2 through which the supply tube 4 can pass and to which the tube holding mechanism 6 is attached. The penetrating portion 3c2 is provided so as to penetrate the tip wall 3c1 so that the supply tube 4 can pass from the inside to the outside of the rotary cylinder 3c. Further, the tip wall 3c1 is provided with a mounting portion 3c3 for fixing the counter mass unit 3d. The mounting portion 3c3 is provided with a female screw into which the base portion 3d1 described later of the counter mass unit 3d is screwed.

The penetrating portion 3c2 and the mounting portion 3c3 are arranged at point-symmetrical positions about the rotation axis L. Therefore, the supply tube 4 held by the tube holding mechanism 6 to which the penetrating portion 3c2 is attached and the counter mass unit 3d attached to the attachment portion 3c3 have the rotation axis L as viewed from the direction along the rotation axis L. It is arranged across. That is, the counter mass unit 3d fixed to the rotary cylinder 3c is arranged at a position opposite to the supply tube 4 across the rotary shaft center L when viewed from the direction along the rotary shaft center L.

Further, as shown in FIG. 2, the tip wall 3c1 is arranged in front of the rotating body accommodating portion 2a of the casing 2 in the direction along the rotation axis L. That is, the rotary cylinder 3c extends forward from the tip opening S1 of the gap S to the front in the injection direction of the liquid nitrogen X. The outer edge portion of such a tip wall 3c1 is a flange portion 3c4 that bulges outward in the radial direction about the rotation axis L from the peripheral wall of the rotary cylinder 3c. That is, the tip wall 3c1 has a flange portion 3c4 that is provided so as to project radially outward from a portion (referred to as a base portion 3c5) where the flange portion 3c4 is not provided. Further, the flange portion 3c4 is provided over the entire circumference of the rotary cylinder 3c with the rotation axis L as the center. Such a flange portion 3c4 is provided so as to cover the gap S between the rotary cylinder 3c and the rotating body accommodating portion 2a of the casing 2 when viewed from the outside of the casing 2, and is always provided including during rotation of the rotary cylinder 3c. It prevents foreign matter from entering the inside of the rotating cylinder 3c, the rotating body accommodating portion 2a, and the gap S from the outside.

The counter mass unit 3d includes a base portion 3d1, a detachable weight 3d2, and a weight fixing bolt 3d3. The base portion 3d1 is screwed to the mounting portion 3c3 provided on the tip wall 3c1 of the rotary cylinder 3c. The base portion 3d1 is a heavy member which is a main portion of the counter mass unit 3d. The mass of the base portion 3d1 acts on the rotary cylinder 3c due to the centrifugal force acting on the rotary cylinder 3c due to the mass of the supply tube 4 and the tube holding mechanism 6 and the mass of the counter mass unit 3d when the rotary cylinder 3c rotates. It is set so that the centrifugal force is almost the same. Such a substrate portion 3d1 has a substantially cylindrical shape, and is fixed to the tip wall 3c1 of the rotary cylinder 3c so as to project from the rotary cylinder 3c toward the front of the rotary cylinder 3c. A bolt hole 3d4 for screwing the weight fixing bolt 3d3 is provided on the tip surface of the substrate portion 3d1.

The detachable weight 3d2 is a disk-shaped member having substantially the same diameter as the base portion 3d1 when viewed from the direction along the rotation axis L, and has an opening in the central portion through which the weight fixing bolt 3d3 can pass. .. The detachable weight 3d2 is detachable from the base portion 3d1 by the weight fixing bolt 3d3, and by selecting attachment / detachment, the total mass of the countermass unit 3d (that is, when the rotary cylinder 3c is rotated, the countermass unit 3d Centrifugal force acting by mass) can be adjusted.

In the weight fixing bolt 3d3, the shaft portion is screwed into the bolt hole 3d4 of the base portion 3d1, and the attachment / detachment weight 3d2 is pressed against the base portion 3d1 at the head to fasten the attachment / detachment weight 3d2 to the base portion 3d1. ..

The supply tube 4 is a flexible metal tube for guiding liquid nitrogen X from a source (not shown) to the nozzle unit 5. The supply tube 4 is inserted from the inside of the tube insertion portion 2c of the casing 2 into the inside of the rotating cylinder 3c of the rotating unit 3 (that is, the inside of the rotating body accommodating portion 2a) through the opening 2b1 of the transmission mechanism accommodating portion 2b. .. The tip of the supply tube 4 is pulled out of the rotary cylinder 3c through a penetration portion 3c2 provided on the tip wall 3c1 of the rotary cylinder 3c, and the diameter of the supply tube 4 is from the rotation axis L by the tube holding mechanism 6 at the penetration portion 3c2. The nozzle unit 5 is connected to the tip while being pivotally supported at a position displaced in the direction. Further, the supply tube 4 is fixed to the rear end portion of the tube insertion portion 2c. In such a supply tube 4, when the rotary cylinder 3c is rotated around the rotation axis L, the tip portion of the supply tube 4 rotates around the rotation axis L while the intermediate portion is fixed to the tube insertion portion 2c. It is rotated like this. As will be described later, the tip of the supply tube 4 is rotatably supported by the tube holding mechanism 6 with respect to the rotary cylinder 3c. Therefore, the supply tube 4 is not greatly twisted by the rotation of the rotary cylinder 3c, and the tip portion is always rotatable so as to rotate about the rotation axis L.

The nozzle unit 5 is fixed to the tip of the supply tube 4. As shown in FIG. 2, the nozzle unit 5 has a base portion 5a, a first nozzle 5b, and a second nozzle 5c. The base portion 5a is a block body connected to the supply tube 4 and having an internal flow path connected to the first nozzle 5b and the second nozzle 5c. The internal flow path of the base portion 5a is single on the root side (supply tube 4 side) of the base portion 5a, and is branched into a plurality of branches on the tip side. The number of branches in the internal flow path is arbitrary. It is also possible to adopt a configuration in which the internal flow path is not branched.

The first nozzle 5b is fixed to the base portion 5a so as to be connected to the internal flow path. The first nozzle 5b injects liquid nitrogen X supplied from the supply tube 4 toward the outside through the internal flow path of the base portion 5a. The second nozzle 5c is fixed to the base portion 5a so as to be connected to the internal flow path. The second nozzle 5c injects liquid nitrogen X supplied from the supply tube 4 toward the outside through the internal flow path of the base portion 5a. That is, in the present embodiment, the liquid nitrogen X is ejected from the first nozzle 5b and the second nozzle 5c toward the outside.

FIG. 3 is an enlarged cross-sectional view including the tube holding mechanism 6. The tube holding mechanism 6 is attached to a penetrating portion 3c2 provided on the tip wall 3c1 of the rotary cylinder 3c. As shown in FIG. 3, the tube holding mechanism 6 includes a heat insulating sleeve 6a, a first bearing 6b, a second bearing 6c, and a clamp 6d.

The heat insulating sleeve 6a is a substantially cylindrical member into which the supply tube 4 is slidably inserted, and has higher heat insulating properties than the supply tube 4 because it is made of a resin material. The heat insulating sleeve 6a is provided at the end of the tubular shaft portion 6a1 having a through hole through which the supply tube 4 is inserted, and at the end of the shaft portion 6a1, and also projects radially outward of the shaft portion 6a1 (base). It has a flange portion 6a2. In such a heat insulating sleeve 6a, the supply tube 4 is inserted so that the end portion provided with the flange portion 6a2 faces the tip end side of the supply tube 4. Such a flange portion 6a2 has a larger diameter than the penetrating portion 3c2 of the rotary cylinder 3c, and by covering the penetrating portion 3c2, an external foreign substance invades the inside of the rotary cylinder 3c via the penetrating portion 3c2. To prevent.

Further, the flange portion 6a2 is rotated so as to rotate about the rotation axis L by rotating the rotary cylinder 3c around the rotation axis L. The flange portion 6a2 that swivels in this way stops the progress of foreign matter such as dust scattered from the front side toward the rotary cylinder 3c, and the foreign matter is present as compared with the case where the flange portion 6a2 is not provided on the heat insulating sleeve 6a. The rate of reaching the rotary cylinder 3c can be reduced. That is, the flange portion 6a2 can stop the progress of at least a part of the foreign matter toward the gap S formed between the rotating cylinder 3c and the rotating body accommodating portion 2a, and the rotating cylinder 3c and the rotating body accommodating portion 2a Prevents foreign matter from entering the gap S from the outside.

The first bearing 6b is arranged on the tip end side of the supply tube 4 with respect to the second bearing 6c. The second bearing 6c is arranged on the rear end side of the supply tube 4 with respect to the first bearing 6b. The first bearing 6b and the second bearing 6c rotatably hold the supply tube 4 via the heat insulating sleeve 6a. Further, the first bearing 6b and the second bearing 6c are slidable with respect to the shaft portion 6a1 of the heat insulating sleeve 6a in the longitudinal direction of the supply tube 4.

The clamp 6d is arranged on the tip end side of the supply tube 4 with respect to the heat insulating sleeve 6a, and is fixed to the supply tube 4 by sandwiching the supply tube 4. When such a clamp 6d comes into contact with the tip surface of the heat insulating sleeve 6a, the heat insulating sleeve 6a slidable with respect to the supply tube 4 moves to the tip side of the supply tube 4 with respect to the clamp 6d. To prevent. Such a clamp 6d prevents the shaft portion 6a1 of the heat insulating sleeve 6a from coming off from the first bearing 6b and the second bearing 6c.

The holding position and holding angle of the supply tube 4 by the tube holding mechanism 6 and the length of the supply tube 4 are set so that a large stress is not locally applied to the supply tube 4. For example, it is assumed that the nozzle unit 5 has a structure having a single injection opening for injecting liquid nitrogen X on an extension of the axis at the connection end of the supply tube 4. Further, let δ be the distance from the rotation axis L in the radial direction about the rotation axis L of the rotation cylinder 3c to the tip position of the nozzle unit 5. Further, the angle formed by the injection axis of the nozzle unit 5 (the axis of the supply tube 4 at the connection end) and the rotation axis L is defined as α. Further, let d be the distance from the holding position of the supply tube 4 of the tube insertion portion 2c to the tip position of the nozzle unit 5 in the direction along the rotation axis L. In this case, first, the distance δ and the angle α are set based on the specifications required for the liquid injection device 1. Further, the distance d is set so that the maximum bending stress acting on the supply tube 4 is half or less of the fatigue limit value of the supply tube 4. The holding position and holding angle of the supply tube 4 by the tube holding mechanism 6 and the length of the supply tube 4 are set so that the distance δ, the angle α, and the distance d set in this way are realized. In this way, by setting the holding position and holding angle of the supply tube 4 by the tube holding mechanism 6 and the length of the supply tube 4, it is possible to more reliably prevent the supply tube 4 from being damaged by fatigue. ..

Returning to FIG. 1, the air drill 7 receives compressed air supplied from the outside and generates rotational power for rotating the rotary cylinder 3c, and is connected to the lower end of the transmission mechanism accommodating portion 2b of the casing 2. There is. As shown in FIG. 2, in such an air drill 7, the output shaft 7a is arranged inside the transmission mechanism accommodating portion 2b, and the output shaft 7a is connected to the power transmission mechanism 8.

The power transmission mechanism 8 is a mechanism that connects the air drill 7 and the rotary cylinder 3c and transmits rotational power from the air drill 7 to the rotary cylinder 3c. As shown in FIG. 2, the power transmission mechanism 8 includes a drive gear 8a fixed to the output shaft 7a of the air drill 7 and a driven gear 8b fixed to the peripheral surface of the rotary cylinder 3c and meshed with the drive gear 8a. have.

In the liquid injection device 1 of the present embodiment adopting such a configuration, when compressed air is supplied to the air drill 7 from the outside, rotational power is generated by the air drill 7. The rotational power generated by the air drill 7 is transmitted to the rotary cylinder 3c of the rotary unit 3 by the power transmission mechanism 8. As a result, the rotary cylinder 3c is rotated around the rotation axis L.

When the rotary cylinder 3c is rotated, the supply tube 4 is held by the tube holding mechanism 6 which is rotated along with the rotary cylinder 3c in a state where the connection portion of the casing 2 with the tube insertion portion 2c is fixed. Is rotated (turned) around the rotation axis L. At this time, since the supply tube 4 is rotatably held by the tube holding mechanism 6, the tip portion thereof is continuously rotated without the supply tube 4 being significantly twisted. As a result, the nozzle unit 5 connected to the tip of the supply tube 4 is rotated around the rotation axis L.

Further, when liquid nitrogen X is supplied to the supply tube 4 from a supply device (not shown), the liquid nitrogen X is supplied to the rotated nozzle unit 5 and injected from the first nozzle 5b and the second nozzle 5c. For example, when liquid nitrogen is injected into concrete, the concrete can be processed by the expansion force when the liquid nitrogen enters the porous of the concrete and the liquid nitrogen is vaporized after the injection. By injecting liquid nitrogen X from the nozzle unit 5 rotated in this way, it becomes possible to inject liquid nitrogen X over a wide range without the operator moving the liquid injection device 1.

Here, in the liquid injection device 1 of the present embodiment, the liquid injection device 1 is arranged in front of the gap S between the rotary cylinder 3c and the casing 2 that surrounds the rotary cylinder 3c from the radial outside, and protrudes radially outward from the base. It has a flange portion (a flange portion 3c4 of the rotary cylinder 3c and a flange portion 6a2 of the tube holding mechanism 6) that prevent foreign matter from entering the inner part of the gap S. Therefore, it is possible to prevent foreign matter from entering the deep part of the gap S and prevent harmful effects caused by the foreign matter entering the gap S.

Further, in the liquid injection device 1 of the present embodiment, the rotary cylinder 3c extends forward from the tip opening S1 of the gap S, and the flange portion 3c4 covers the gap S when viewed from the direction along the rotation axis L. It is provided at the front end of the rotary cylinder 3c. Therefore, the flange portion 3c4 can be integrated with the rotary cylinder 3c, and it is not necessary to install the flange portion 3c4 as a separate part. Therefore, according to the liquid injection device 1 of the present embodiment, it is possible to prevent foreign matter from entering the gap S with a simple configuration.

Further, in the liquid injection device 1 of the present embodiment, a penetration portion 3c2 through which a supply tube 4 for supplying liquid nitrogen X is passed to the nozzle unit 5 is provided on the tip wall 3c1 of the rotary cylinder 3c, and the supply tube 4 is used as a shaft. It is provided with a tube holding mechanism 6 having a flange portion 3c4 which is supported and arranged in front of the penetrating portion 3c2. Therefore, the flange portion 3c4 can prevent foreign matter from entering not only the gap S but also the penetrating portion 3c2. Therefore, according to the liquid injection device 1 of the present embodiment, it is possible to maintain the smooth operation of the first bearing 6b and the second bearing 6c.

(Second Embodiment)
Next, the second embodiment of the present invention will be described with reference to FIG. In the description of the present embodiment, the same parts as those of the first embodiment will be omitted or simplified.

FIG. 4 is a cross-sectional view of the liquid injection device 1A according to the second embodiment of the present invention. As shown in this figure, the liquid injection device 1A of the present embodiment includes an air drill 7 and a compressed air supply unit 9 that supplies compressed air Y to the gap S.

The air drill 7 generates power to rotate the rotary cylinder 3c by converting the pressure of the compressed air Y supplied from the compressed air supply unit 9 into rotational power. Further, in the present embodiment, a supply port 2d for supplying compressed air Y is provided inside the rotating body accommodating portion 2a of the casing 2. A compressed air supply unit 9 is connected to the supply port 2d, and the compressed air Y is supplied from the compressed air supply unit 9 to the inside of the rotating body accommodating unit 2a.

The casing 2 is sealed except for the tip opening S1 of the gap S. Therefore, the compressed air Y supplied from the supply port 2d to the inside of the rotating body accommodating portion 2a flows through the gap S along the rotation axis L and is discharged forward from the tip opening S1 of the gap S.

According to the liquid injection device 1A of the present embodiment as described above, the compressed air Y is supplied from the compressed air supply unit 9 to the gap S, and the air flow inside the gap S toward the tip opening S1 of the gap S. Is formed. Therefore, even if there is a foreign substance that cannot be prevented from entering the gap S by the flange portion 3c4 of the rotary cylinder 3c and the flange portion 6a2 of the tube holding mechanism 6, the foreign matter is generated by the air flow formed inside the gap S. It is possible to prevent the gap S from reaching the inner part.

Further, in the liquid injection device 1A of the present embodiment, compressed air is supplied to the gap S from the compressed air supply unit 9 that supplies the compressed air Y to the air drill 7. Therefore, the liquid injection device 1A of the present embodiment does not need to be provided with a device for supplying the compressed air Y to the gap S separately from the compressed air supply unit 9, and the device is downsized.

The installation location of the supply port 2d is not limited to the space between the front end side bearing 3a and the rear end side bearing 3b of the rotating body accommodating portion 2a as shown in FIG. For example, it is also possible to install the supply port 2d in the transmission mechanism accommodating portion 2b of the casing 2 and supply the compressed air Y to the gap S through the inside of the transmission mechanism accommodating portion 2b. It is also possible to install the supply port 2d on the tip side of the rotating body accommodating portion 2a with respect to the tip side bearing 3a of the rotating body accommodating portion 2a.

Further, in the present embodiment, the liquid injection device 1A is provided with the compressed air supply unit 9. However, the present invention is not limited to this, and for example, compressed air Y may be supplied to the gap S and the air drill 7 from an external compressed air source. In this case, the liquid injection device 1A is provided with a supply port 2d for supplying compressed air Y to the gap S.

(Third Embodiment)
Next, the third embodiment of the present invention will be described with reference to FIG. In the description of the present embodiment, the same parts as those of the first embodiment will be omitted or simplified.

FIG. 5 is a cross-sectional view of the liquid injection device 1B according to the third embodiment of the present invention. As shown in this figure, the liquid injection device 1B of the present embodiment includes a rotary blade row 10 provided for the gap S.

The rotary blade row 10 is formed by a plurality of blades arranged in an annular shape around the rotation axis L on the peripheral surface of the rotary cylinder 3c. As shown in FIG. 5, the rotary blade row 10 is arranged on the tip side of the rotary cylinder 3c with respect to the tip side bearing 3a, and is rotated around the rotation axis L as the rotary cylinder 3c rotates. When such a rotary blade row 10 is rotated, air is pumped from the inner side toward the tip opening S1 to form an air flow inside the gap S.

Further, in the liquid injection device 1B of the present embodiment, a through hole 2e is provided in the rotating body accommodating portion 2a of the casing 2 so that air can flow into the gap S from the outside. The through hole 2e is provided on the rear end side of the rotary blade row 10. Since the air can flow into the gap S from the outside by such a through hole 2e, it is possible to sufficiently secure the flow rate of the air flow flowing through the gap S by the rotation of the rotary blade row 10.

It should be noted that the flow resistance of the air flow can be reduced by setting the installation location of the rotary blade row 10 on the tip side of the tip side bearing 3a. However, if an installation space can be secured between the front end side bearing 3a and the rear end side bearing 3b, or on the rear end side of the rear end side bearing 3b, install it on the rear end side of the rear end side bearing 3b. Is also possible.

(Fourth Embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. In the description of the present embodiment, the same parts as those of the first embodiment will be omitted or simplified.

FIG. 6 is a cross-sectional view of the liquid injection device 1C according to the fourth embodiment of the present invention. As shown in this figure, the liquid injection device 1C of the present embodiment includes the compressed air supply unit 9 and the supply port 2d of the second embodiment, and further includes the rotary blade row 10 of the third embodiment. ..

According to the liquid injection device 1C of the present embodiment as described above, an air flow can be formed with respect to the gap S by the compressed air supply unit 9 and the rotary blade row 10.

Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the above embodiment. The various shapes and combinations of the constituent members shown in the above-described embodiment are examples, and can be variously changed based on design requirements and the like without departing from the spirit of the present invention.

For example, in the above embodiment, the configuration in which the flange portion 3c4 provided in the rotary cylinder 3c is arranged in front of the tip opening S1 of the gap S has been described. However, the present invention is not limited to this. For example, the flange portion 3c4 may be installed inside the gap S. Further, it is also possible to provide a flange portion so as to project inward in the radial direction of the rotation axis L from the inner wall surface of the rotating body accommodating portion 2a.

Further, in the above embodiment, the configuration including the counter mass unit 3d has been described. However, the present invention is not limited to this, and it is also possible to adopt a configuration that does not include the counter mass unit 3d.

Further, in the above embodiment, the configuration in which the fluid injected by the liquid injection device 1 is liquid nitrogen has been described. However, the present invention is not limited. As the fluid to be sprayed, a cryogenic liquid other than liquid nitrogen, water, a blasting agent and the like can be used. That is, the liquid injection device 1 of the present invention can also be applied to a water jet device and a polishing device.

1 ... Liquid injection device 1A ... Liquid injection device 1B ... Liquid injection device 1C ... Liquid injection device 2 ... Casing 2a ... Rotating body housing 2b ... Transmission mechanism housing 2b1 ... Opening 2c ... Tube insertion part 2d …… Supply port 2e …… Through hole 3 …… Rotating unit 3a …… Tip side bearing 3b …… Rear end side bearing 3c …… Rotating cylinder (rotary body)
3c1 …… Tip wall 3c2 …… Penetration part 3c3 …… Mounting part 3c4 …… Flange part 3c5 …… Base 3d …… Counter mass unit 3d1 …… Base part 3d2 …… Detachable weight 3d3 …… Weight fixing bolt 3d4 …… Bolt Hole 4 …… Supply tube (tube)
5 …… Nozzle unit 5a …… Base part 5b …… First nozzle 5c …… Second nozzle 6 …… Tube holding mechanism 6a …… Insulation sleeve 6a1 …… Shaft part 6a2 …… Gear part 6b …… First bearing 6c 2nd bearing 6d ... Clamp 7 ... Air drill 7a ... Output shaft 8 ... Power transmission mechanism 8a ... Drive gear 8b ... Driven gear 9 ... Compressed air supply unit 10 ... Rotating blade row L ... Rotation axis S …… Gap S1 …… Tip opening X …… Liquid nitrogen Y …… Compressed air

Claims (5)

A rotating body that is rotated around the center of rotation, a casing that surrounds the rotating body with a gap from the radial outside of the center of rotation to the rotating body, and a fluid in a direction along the center of rotation. A liquid injection device equipped with a nozzle for injecting
It is arranged in front of the gap or inside the gap in the injection direction of the fluid, and has a flange portion that is provided so as to project radially from the base to prevent foreign matter from entering the depth of the gap. ,
The rotating body extends forward from the tip opening of the gap to the front in the injection direction of the fluid, and the flange portion is provided at the front end of the rotating body so as to cover the gap when viewed from a direction along the rotation axis. Have been
A liquid injection device characterized by that. A through hole through which a supply tube for supplying the fluid is passed to the nozzle is provided in the tip wall of the rotating body.
The liquid injection device according to claim 1 , wherein the supply tube is pivotally supported and a tube holding mechanism having the flange portion arranged in front of the through hole in the injection direction of the fluid is provided. The liquid injection device according to claim 1 or 2 , further comprising a compressed air supply unit that supplies compressed air to the gap. 3. The third aspect of claim 3 , further comprising an air drill that generates power to rotate the rotating body by supplying compressed air, wherein the compressed air supply unit supplies the compressed air to the air drill and the gap. Liquid injection device. The liquid according to any one of claims 1 to 4 , wherein the liquid is provided inside the gap and is provided with a rotary blade train that is arranged inside the gap and pumps air from the inner side of the gap toward the tip opening of the gap. Injection device.

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