JP7328705B2 - spray nozzle unit - Google Patents

Description

TECHNICAL FIELD The present invention relates to a spray nozzle unit used for spraying liquids such as chemical solutions and water.

In a liquid spraying device for spraying chemical solutions, water, etc., a spray nozzle unit (hereinafter also simply referred to as a "nozzle unit") attached to a liquid supply source is provided with a plurality of nozzles, and the nozzles for spraying liquid can be switched. There is something like

For example, the spray nozzle unit described in Patent Document 1 is attached to a jet pipe (boom) as a liquid supply source, and has a mounting member (first pipe joint and elbow of the second pipe joint), an inner cylinder (sleeve of the second pipe joint) having a liquid passage that continues to the liquid lead-out path of the mounting member, and a union that connects the connection port of the mounting member and one end of the inner cylinder A nut and a cylindrical rotating head (third pipe joint and second pipe joint) arranged radially outward from the center to the other end of the inner cylinder and retained in a rotatable state with respect to the inner cylinder. and two nozzles (spray nozzles) respectively attached to two nozzle attachment openings (nozzle holders) protruding from the outer periphery of the rotating head. The nozzle mounting openings of the rotary head are provided at the same axial position and opposite circumferential positions across the axis, and the two nozzles have different spray patterns.

In addition, the inner cylinder has one outflow hole radially penetrating the cylinder wall on the other end side, and the rotary head extends from the inner peripheral surface near the same axial position as the outflow hole of the inner cylinder to each nozzle mounting port. It has a plurality of inflow ports penetrating inward. Therefore, when the rotating head is rotated to change the circumferential positional relationship between the inflow port of the rotating head and the outflow hole of the inner cylinder, the nozzles that inject the liquid that has flowed from the liquid supply source into the liquid passage through the liquid lead-out path are switched. be able to. That is, by selectively aligning the circumferential positions of the plurality of inflow ports of the rotating head with the outflow holes of the inner cylinder, the ejection state (spraying state) of the liquid can be switched.

In the nozzle unit that can switch the spray state by rotating the rotating head, the rotating head is attached to the inner cylinder between the inner peripheral surface of the rotating head and the outer peripheral surface of the inner cylinder. Many of them incorporate a valve body having a valve hole that allows the inflow port and the outflow hole of the inner cylinder to communicate with each other at a predetermined position in the circumferential direction (see, for example, Patent Document 2).

Japanese Patent No. 6383392 Japanese Patent No. 5520879

However, in the nozzle unit incorporating the valve body as described above, the valve body and the rotating head that slides against the valve body are usually molded from a resin such as polyethylene. In order to ensure sealing performance, the inner peripheral surface of the rotary head must be processed after molding, and there is a problem that this inner peripheral processing requires time and effort and costs.

Accordingly, the present invention provides a spray nozzle unit of a type in which the spray state can be switched by rotating the rotary head, so that the rotary head and the valve body incorporated between the rotary head and the inner cylinder can be easily manufactured. The task is to

In order to solve the above problems, the present invention provides a mounting member that is attached to a liquid supply source and has a liquid lead-out path through which the liquid supplied from the liquid supply source passes; an inner cylinder having a liquid passage that is continuous with the lead-out path; a cylindrical rotating head that is arranged radially outside of the other end of the inner cylinder and that is retained in a rotatable state with respect to the inner cylinder; a nozzle attached to a nozzle attachment port protruding from the outer periphery of the rotating head; the inner cylinder has an outflow hole radially penetrating the cylinder wall on the other end side; and the rotating head and the outflow hole of the inner cylinder. It has an inflow port penetrating from the inner peripheral surface near the same axial position to the inside of the nozzle mounting port, and by rotating the rotating head, the circumferential positional relationship between the inflow port of the rotating head and the outflow hole of the inner cylinder is changed. In a spray nozzle unit that changes the ejection state of the liquid that has flowed from the liquid supply source through the liquid lead-out passage into the liquid passage, the inner peripheral surface of the rotary head and the outer peripheral surface of the inner cylinder are changed. A rubber valve body that rotates integrally with the rotating head and has a valve hole that communicates the inflow port of the rotating head and the outflow hole of the inner cylinder at a predetermined position in the circumferential direction is incorporated between It was adopted.

According to the above configuration, the rubber valve body that rotates together with the rotary head slides on the inner cylinder, and a high sealing performance is obtained between the valve body and the inner cylinder. In either case, it is possible to manufacture easily without requiring processing of the inner peripheral surface for ensuring sealing performance.

Here, the valve body is provided with an insertion opening that is inserted from the periphery of the valve hole into the inflow port of the rotary head, and is integrated with the rotation head by inserting the insertion opening into the inflow port. can be used.

In addition, if a valve retainer for suppressing deformation of the valve body is incorporated in the inner periphery of the inflow port of the rotating head and the insertion opening of the valve body, a gap between the valve body and the inner cylinder can be Sealability can be more stably ensured.

As described above, the spray nozzle unit of the present invention rotates integrally with the rotating head between the inner peripheral surface of the rotating head and the outer peripheral surface of the inner cylinder, and the inflow port of the rotating head and the inflow port of the rotating head at a predetermined position in the circumferential direction. A rubber valve body having a valve hole that communicates with the outflow hole of the inner cylinder is incorporated so that the valve body slides on the inner cylinder and high sealing performance is obtained between the valve body and the inner cylinder. Therefore, neither the rotary head nor the valve body require inner circumference processing for ensuring sealing performance, and can be easily manufactured.

A longitudinal front view of the spray nozzle unit of the embodiment. Exploded perspective view of FIG. Partially broken side view seen from the right side of Fig. 1 Partially broken side view for explaining the switching operation of the spray state corresponding to FIG.

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, this nozzle unit is mounted at the position of the ejection hole h formed in the ejection pipe P as a liquid supply source. A mounting member 1 having a liquid lead-out path 1a through which a liquid to be supplied passes; an inner cylinder 2 having a liquid passage 2a continuous with the liquid lead-out path 1a of the mounting member 1; and two nozzles 5 and 6 attached to the rotating head 4, and the connecting portion of the mounting member 1 to the inner cylinder 2 is separated from the main body and integrated with the inner cylinder 2. It is a thing.

The main body portion of the mounting member 1 is arranged on the nozzle mounting side of the jet pipe P and faces the first mounting piece 11 having the inlet side portion of the liquid lead-out path 1a with the jet pipe P interposed therebetween. The second mounting piece 12 is attached to the jet pipe P by being integrated with two bolts in a state in which the jet pipe P is sandwiched between the tube receiving grooves having a semicircular cross section. ing. The first mounting piece 11 has a cylindrical connection port 13 having a threaded outer periphery, and an insertion cylindrical portion 14 which is inserted into the ejection hole h of the ejection pipe P and forms the inlet of the liquid lead-out passage 1a. is provided.

On the other hand, the connecting portion of the mounting member 1 includes an elbow 16 having an L-shaped outlet side portion of the liquid lead-out passage 1a and a cylindrical portion having a small diameter portion press-fitted into the inner periphery of the elbow 16 on the inlet side. A joint 15, a packing 17 fitted in the inner periphery of the connection port 13 of the first attachment piece 11 constituting the main body portion in a state of contacting the large-diameter side end face of the joint 15, and the connection port 13 of the first attachment piece 11. and a union nut 18 that is screwed to connect the joint 15 to the first mounting piece 11 . The elbow 16 is formed integrally with the inner cylinder 2 so that the liquid lead-out path 1a is connected to one end of the inner cylinder 2 so as to be continuous with the liquid passage 2a of the inner cylinder 2 .

The inner cylinder 2 is provided with a pair of protrusions 21, a first flange 22, and a second flange 23 protruding from the outer periphery so as to form a detent mechanism, which will be described later, in this order from one end side. Further, at the other end of the inner cylinder 2, an outflow hole 2b is formed through the cylinder wall in the radial direction to discharge the liquid that has flowed into the liquid passage 2a to the nozzles 5 and 6. As shown in FIG.

The rotary head 4 is a cylindrical member with one end open and the other end closed, and a concave portion 4a forming a detent mechanism (to be described later) together with the protrusion 21 of the inner cylinder 2 is formed on the inner peripheral side stepped portion of one end surface. Four of them are provided at equal intervals in the circumferential direction.

Two horizontal holes 4b into which the pair of arms 7a of the U-shaped resin retaining member 7 are inserted are provided at one end of the rotary head 4, and the arm insertion sides of the two horizontal holes 4b A circumferential groove 4c is provided between the openings. Then, when the rotating head 4 is assembled radially outward from the center portion of the inner cylinder 2 to the other end portion, and each arm 7a of the retainer member 7 is inserted into the horizontal hole 4b, the center portion of the inner cylinder 2 becomes the second end of the inner cylinder 2. It enters between the first flange 22 and the second flange 23 . At this time, the retaining member 7 is such that the arm connecting portion 7b that connects the arms 7a is fitted into the circumferential groove 4c of the rotating head 4, and at the same time, the claw 7c provided at the tip of each arm 7a is engaged. It engages with the peripheral edge of the horizontal hole 4b on the side opposite to the insertion side, and retains the rotating head 4 in a rotatable state with respect to the inner cylinder 2.例文帳に追加

Here, since the rotation head 4 is restricted from moving to the other end side by the contact of each arm 7a of the retaining member 7 with the second flange 23 of the inner cylinder 2, the two projections 21 of the inner cylinder 2 is fitted in the upper and lower recesses 4a or the left and right recesses 4a, the circumferential position is maintained unless it is intentionally rotated. On the other hand, if a certain amount of force is applied to the rotary head 4 in the rotational direction, the arm 7a of the retainer member 7 is flexed to move the rotary head 4 to the other end side, and at the same time, the concave portion 4a of the rotary head 4 and the inner cylinder 2 are disengaged. can be disengaged to move the rotary head 4 to another circumferential position. That is, in this nozzle unit, a detent mechanism is configured that can apply resistance to the rotation of the rotary head 4 and hold the rotary head 4 at a predetermined position in the circumferential direction unless an intentional force is applied. .

Also, as shown in FIG. 3, the other end of the rotary head 4 protrudes from the outer periphery at a circumferential position facing the central axis in the vicinity of the same axial position as the outflow hole 2b of the inner cylinder 2. A pair of cylindrical nozzle mounting openings 41 and an inflow port 4d penetrating from the inner peripheral surface to the inside of each nozzle mounting opening 41 are provided.

A rubber such as acrylonitrile-butadiene rubber (NBR) or fluororubber (FKM) is formed between the inner peripheral surface around the inflow port 4d of the rotating head 4 and the outer peripheral surface around the outflow hole 2b of the inner cylinder 2. A closed cylindrical valve body 8 is incorporated. A pair of valve holes 8a are formed in the central portion of the valve body 8 at circumferential positions opposite to each other with the central axis interposed therebetween. 8b are inserted into the inflow ports 4d of the rotary head 4, respectively. That is, the rubber valve body 8 rotates integrally with the rotary head 4, and communicates the inflow port 4d of the rotary head 4 with the outflow hole 2b of the inner cylinder 2 at a predetermined position in the circumferential direction through the valve hole 8a. be. Further, a valve retainer 9 for suppressing deformation of the valve body 8 is fitted to the inner periphery of counterbore portions formed on the outer peripheral side of the insertion port 8b and the inflow port 4d.

The nozzles 5 and 6 attached to the respective nozzle attachment openings 41 of the rotary head 4 are known nozzles having different spray patterns. One of the nozzles 5 includes a three-cut packing 51, a filter 52, and an annular packing 53 that are fitted to the inner periphery of the nozzle mounting port 41, and a union nut that is screwed to a male thread formed on the outer periphery of the nozzle mounting port 41. 54, a holder 55 connected to the nozzle mounting port 41 by a union nut 54, an orifice plate 56 incorporated in the holder 55, an ejection plate 57 fixed to the tip side of the holder 55, and the like.

The other nozzle 6 is also composed of a three-cut packing 61, a filter 62, a packing 63, a union nut 64, a holder 65, a jet plate 66, etc. similar to the one described above, but the holder 65 is short. , in that no orifice plate is incorporated in the holder 65, and in the shape of the injection hole (not shown) of the injection plate 66.

Both of the nozzles 5 and 6 eject the liquid that has flowed from the liquid passage 2a of the inner cylinder 2 through the valve hole 8a of the valve body 8 and the inflow port 4d of the rotary head 4 from the ejection plates 57 and 66. It's becoming

In addition, O-rings 10 are incorporated in portions of this nozzle unit that require liquid-tight sealing.

This nozzle unit has the above configuration, and when the projections 21 of the inner cylinder 2 are partially fitted into the upper and lower concave portions 4a of the rotary head 4, the two inflow ports 4d of the rotary head 4 (and the rotary One of the valve holes 8a) of the valve body 8 that rotates integrally with the head 4 overlaps with the outflow hole 2b of the inner cylinder 2, and a part of the projection 21 of the inner cylinder 2 is recessed on the left and right sides of the rotary head 4. 4a, the two inflow ports 4d of the rotary head 4 do not overlap the outflow hole 2b of the inner cylinder 2, and the detent mechanism causes the rotary head 4 to move in the circumferential direction. It is designed to be retained. Further, as shown in FIG. 4, by rotating the rotary head 4 against the resistance of the detent mechanism, the circumferential positional relationship between the inflow port 4d and the outflow hole 2b can be changed. That is, the detent mechanism causes the liquid flowing from the jet pipe P through the liquid lead-out passage 1a of the mounting member 1 into the liquid passage 2a of the inner cylinder 2 to be jetted from either one of the two nozzles 5, 6, or the liquid It is possible to stably maintain the state in which the injection is stopped, and to easily switch the state.

Further, since the rubber valve body 8 that rotates integrally with the rotary head 4 slides on the inner cylinder 2 and its deformation is suppressed by the valve retainer 9, the valve body 8 and the inner cylinder 2 are prevented from being deformed. A high sealing performance is stably ensured between them. Therefore, both the rotary head 4 and the valve body 8 can be easily manufactured without requiring inner circumference processing for ensuring sealing performance, which is performed for the conventional rotary head.

It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the meaning described above, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.

For example, in the above-described embodiment, the two nozzles 5 and 6 are attached to the rotary head 4, and the state in which the liquid is ejected from one of them can be switched between the state in which the liquid is ejected and the state in which the liquid is not ejected. The number of nozzles may be one or three or more, and a structure may be employed in which the ejection state (including non-ejection state) of the liquid can be switched accordingly.

In addition, the present invention is not limited to nozzle units in which the liquid lead-out path of the mounting member and the liquid passage of the inner cylinder are perpendicular to each other as in the embodiment, but may be applied to nozzle units of the type in which the liquid lead-out path and the liquid passage extend linearly. can of course also be applied.

1 Mounting member 1a Liquid lead-out path 2 Inner cylinder 2a Liquid passage 2b Outflow hole 4 Rotary head 4d Inflow ports 5, 6 Nozzle 7 Retaining member 8 Valve body 8a Valve hole 8b Insertion port 9 Valve retainer 11 First mounting piece 12 Second 2 Mounting piece 15 Joint 16 Elbow 18 Union nut 41 Nozzle mounting port P Jet pipe (liquid supply source)
h ejection hole

Claims (3)

a mounting member attached to a liquid supply source and having a liquid lead-out path through which the liquid supplied from the liquid supply source passes; and an inner cylinder having one end connected to the mounting member and having a liquid passage continuing to the liquid lead-out path. , a cylindrical rotary head disposed radially outside the other end of the inner cylinder and retained in a rotatable state with respect to the inner cylinder; and a nozzle mounting port projecting from the outer circumference of the rotary head. and a nozzle for
The inner cylinder has an outflow hole radially penetrating the cylinder wall on the other end side, and the rotary head penetrates from the inner peripheral surface near the same axial position as the outflow hole of the inner cylinder to the inside of the nozzle mounting port. By rotating the rotary head to change the positional relationship in the circumferential direction between the inlet port of the rotary head and the outlet hole of the inner cylinder, the liquid passage is formed from the liquid supply source through the liquid lead-out path. In a spray nozzle unit that switches the ejection state of the liquid that has flowed into
By applying resistance to the rotation of the rotating head, the circumferential position of the rotating head is held in a state in which the protrusion protruding from the outer circumference of the inner cylinder engages with a recess provided on one end surface of the rotating head. has a detent mechanism,
A valve hole that rotates integrally with the rotary head and communicates between the inflow port of the rotary head and the outflow hole of the inner cylinder at a predetermined position in the circumferential direction between the inner peripheral surface of the rotary head and the outer peripheral surface of the inner cylinder. A spray nozzle unit characterized by incorporating a rubber valve body having 2. The spray nozzle unit according to claim 1, wherein the valve body is provided with an insertion opening that is inserted into the inflow port of the rotating head from the periphery of the valve hole. 3. The spray nozzle unit according to claim 2, wherein a valve retainer for suppressing deformation of the valve body is incorporated in the inner periphery of the inflow port of the rotary head and the insertion opening of the valve body.

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