CN108351054B

CN108351054B - Component joint and spray nozzle unit using the same

Info

Publication number: CN108351054B
Application number: CN201680001865.7A
Authority: CN
Inventors: 今川良成
Original assignee: Yamaho Industry Co Ltd
Current assignee: Yamaho Industry Co Ltd
Priority date: 2016-09-06
Filing date: 2016-09-06
Publication date: 2020-10-16
Anticipated expiration: 2036-09-06
Also published as: JP6129445B1; WO2018047227A1; CN108351054A; KR20190058223A; TW201812186A; TWI710407B; HK1256993A1; KR102460057B1; JPWO2018047227A1

Abstract

The lock ring (24) is mounted on the outer periphery of the union nut (23) in a manner that the lock ring cannot rotate relatively and cannot move axially relatively, a spring ring (24c) provided on the locking ring and supported by the cantilever is provided with a locking part (24g) in a mountain shape at a fixed pitch on the inner peripheral side, the locking part (24g) can be formed by crossing a first inclined surface (S1) and a second inclined surface (S2) which are oppositely inclined at an obtuse angle, at least one engaging projection (25) for engaging with the locking portion (24g) is provided on the outer periphery of the root end side of the male screw (14) provided on the member to be connected, when the union nut (23) is rotated in the tightening direction, the locking portion (24g) rides over the first cam surface (25a) of the engagement projection (25), when the union nut (23) rotates in the loosening direction, the locking portion (24g) abuts against the second cam surface (25b) of the engagement projection (25) to prevent loosening of the union nut (23). The union nut (23) can be replaced by a bottomed cylindrical cap (26).

Description

Component joint and spray nozzle unit using the same

Technical Field

The present invention relates to a component joint for screw-fitting a union nut and a cap nut to an external thread of a pipe end in a manner that the union nut and the cap nut are prevented from loosening with respect to the external thread of the pipe end, and more particularly, to a component joint which stably prevents loosening at a screw-in end point and which enables easy release of the screw-fitting, and a spray nozzle unit for liquid distribution which connects a nozzle to a nozzle holder using the component joint.

Background

The applicant of the present invention has developed and commercialized a joint in which two members are connected to each other by using a union nut, and the union nut can be reliably prevented from rotating together due to the relative rotation of the two members (see patent document 1 below).

The joint rotation of the union nut caused by the relative rotation of the two members results in loosening of the fastening (fastening by the nut).

For example, in a vehicle (cart) type liquid dispensing apparatus shown in fig. 11, a method is employed in which a plurality of spray nozzle units 1A described above are attached to a spray bar 51 attached to a cart 50 to efficiently spray a medicine or the like.

The spray nozzle unit 1A of fig. 11 includes: a nozzle holder 10A attached to the spray bar 51, and a nozzle head 20A attached to the nozzle holder.

The nozzle head is a component in which a union nut screwed to a nozzle holder and a nozzle fastened by the union nut and fixed to the nozzle holder are combined.

In such a liquid spray apparatus, the fastening of the nozzle by the union nut may be loosened by vibration during use, and the nozzle may be rotated by the loosening, and the spray direction may be changed in an unexpected direction, so that uniform spraying may not be performed.

In the component joint of patent document 1, therefore, the lock ring is rotatably attached to the outer periphery of the union nut, and when the union nut screwed onto the male screw of the nozzle holder to be connected is rotated in the loosening direction of the screw independently of the nozzle holder, the lock claws provided on the lock ring are sandwiched between the projections provided on the nozzle holder and the holding pieces provided on the union nut.

The lock ring is locked by the clamping of the locking claws by the projections and the clamping pieces, and the union nut is reliably prevented from rotating in the loosening direction by the lock ring which cannot rotate.

Patent document 1: japanese patent No. 4917190

The component joint of patent document 1 has a structure in which, when the union nut is rotated in a loosening direction, the lock claws provided on the lock ring are sandwiched between the projections provided on the nozzle holder and the clamp pieces provided on the union nut, so that the lock ring can be extremely firmly prevented from loosening.

However, when the union nut is released from the fastening, it is sometimes necessary to rotate the lock ring solely in the fastening direction of the union nut, fix the relative positions of the union nut and the lock ring at the positions where the lock claws abut against the clamping pieces, and rotate the union nut and the lock ring in the loosening direction simultaneously while maintaining this state, and therefore the operability is not necessarily good.

In the liquid distribution device, it is necessary to replace the nozzle of the nozzle head with a member having a different shape for ejecting ロ or to change the direction of the nozzle, and in this case, it is necessary to temporarily loosen the fastening of the nozzle head.

The joint of the parts of patent document 1 may be used if the liquid distribution device is a liquid distribution device in which the frequency of replacement and direction change of nozzles is low, but as shown in fig. 11, in a liquid distribution device in which a plurality of spray nozzle units 1A are attached to one spray bar 51, it is advantageous that the fastening of the nozzle head 20A can be released more easily and quickly in a device in which the replacement of nozzles and the change of the spray direction are frequently performed.

The joint of parts of patent document 1 also has a point that the structure cannot be said to be sufficiently simplified.

Disclosure of Invention

Accordingly, an object of the present invention is to provide a spray nozzle unit for spraying a liquid, in which a union nut and a cap nut are prevented from loosening stably at a screwing end point by a simple structure, and the union nut and the cap nut can be loosened easily, and a nozzle head and a nozzle holder are connected by using the union nut and the cap nut.

In order to solve the above-described problems, the present invention provides a component joint which includes a union nut and a connection target member having a male screw at an end portion thereof, and is attached so that the union nut is screwed into the male screw of the connection target member, wherein the component joint includes a lock ring which is attached to an outer periphery of a screw-in tip end side of the union nut so as to be relatively non-rotatable and relatively non-axially movable, and the lock ring which has a portion protruding in an axial direction from a tip end of the union nut includes: an outer ring; an inner flange provided on the inner diameter portion of the outer ring so as to project radially inward; a spring ring supported by a cantilever, a free end of which extends from a radially inner end of the inner flange in a direction away from the union nut, a gap allowing diameter expansion by elastic deformation of the spring ring being present between an inner peripheral surface of the outer ring and an outer peripheral surface of the spring ring, the spring ring having, at a fixed pitch in a circumferential direction on an inner peripheral side, mountain-shaped locking portions protruding radially inward, the locking portions being formed by first inclined surfaces inclined in opposite directions and second inclined surfaces inclined at an obtuse angle at an inclination angle larger than that of the first inclined surfaces, the connection target member having, on an outer periphery on a root end side of the male screw, at least one engaging projection which is engaged with the locking portions and protrudes radially outward beyond a circle inscribed in each of the locking portions, the engaging projection including: a first cam surface with a small inclination angle for the lock portion to jump up when the union nut is rotated in the tightening direction, and a second cam surface with a larger inclination angle than the first cam surface for the lock portion to abut against when the union nut is rotated in the loosening direction.

The lock ring is preferably formed of a resin such as polyoxymethylene. The union nut and the nozzle holder are also preferably formed of a resin such as polyoxymethylene.

Further, the member joint preferably has the inclination angle of the second slope of the spring ring larger than that of the first slope, and further preferably has the inclination angle of the first slope a few degrees smaller than that of the second cam surface.

The present invention also provides a spray nozzle unit for liquid spraying, comprising: a nozzle holder for a connection object having an internal flow path, and a nozzle head combined with the nozzle holder, the nozzle head comprising: the nozzle assembly includes a nozzle having a nozzle opening ロ, and a member joint for connecting the nozzle to the nozzle holder, wherein the member joint includes a union nut and a spring ring, and the nozzle is fastened to the union nut screwed to the male screw at the tip of the nozzle holder and fixed to the tip of the nozzle holder.

The spray nozzle unit may further include a filter that allows the liquid sprayed from the nozzle to pass through, the filter being installed in the nozzle holder.

In the component joint of the present invention, it is also conceivable to replace the union nut with a bottomed cylindrical cap (a cap nut) having an internal thread. The member joint using the cap having a cylindrical shape with a bottom cannot be used for connecting the nozzle of the spray nozzle unit and the nozzle holder, but can be used for hermetically sealing the end of the pipe line with the cap.

In addition, the component joint provided with the union nut can be used, for example, in the following cases: the nozzle holder is constituted by a first pipe joint that fixes the nozzle holder to the boom or the like, a second pipe joint that is liquid-tight and is connected to the first pipe joint so as to be relatively rotatable, and a third pipe joint that is externally fitted to the second pipe joint so as not to be relatively rotatable, and the connection of the second pipe joint to the first pipe joint and the connection of the nozzle to the third pipe joint are performed using a member joint including a union nut.

The present invention can also be used when a diaphragm valve for opening and closing a pipeline, which is assembled in the middle of the pipeline, is attached to a first pipe joint of a valve holder or the like using a member joint including a union nut.

In the component joint according to the present invention, when the union nut and the cap to which the lock ring is attached are screwed and fastened to the male screw of the connection target component, the lock portion of the spring ring is provided in a state of being in contact with the engagement protrusion of the connection target component.

Since the lock portion comes into contact with the first cam surface of the engaging projection having a small inclination angle, the lock portion can pass over the engaging projection without applying a large fastening force, and thus the fastening of the union nut and the cap can be smoothly performed without requiring a large force.

On the other hand, when the union nut or the cap receives vibration or the like, the second slope of the lock portion provided in the lock ring engages with the second cam surface of the engagement projection provided in the connection target member, and therefore, looseness of the union nut or the cap to which the lock ring is attached is prevented.

A force to be rotated (reversed) in the loosening direction is applied to the union nut and the cap that are screwed to the male screw of the connection target member by the influence of the lead of the screw.

In addition, the male screw of the member to be connected is formed of resin, and the union nut and the cap are also formed of resin, and in particular, the male screw and the female screw which are elastically deformed by fastening are elastically restored to apply an axial force.

The resultant force of these two forces acts on the contact portion of the second cam surface of the engaging protrusion and the second inclined surface of the spring coil, so that the second inclined surface of the locking portion is pressed against the second cam surface of the engaging protrusion.

When the diameter-expanded state by the elastic deformation of the coil spring is maintained at the position where the locking portion contacts the engaging projection, the elastic restoring force of the coil spring is also applied to the pressing force on the second cam surface of the second inclined surface, thereby applying resistance to the rotation of the locking ring in the loosening direction.

The resistance to the rotation in the loosening direction increases as the coupling nut is screwed in more tightly, and the friction force and the elastic restoring force of the screw fitting portion increase. Therefore, the lock ring cannot rotate beyond the engaging projection unless a force exceeding the resistance force is applied.

Since the union nut and the cap are mounted in a manner such that they cannot rotate relative to each other, the lock ring is prevented from rotating in the loosening direction by continuing the rotation prevention when the union nut and the cap are subjected to vibration or the like.

In addition, the lock ring rotates together with the union nut and the cap. Therefore, the engagement of the locking portion with the engaging projection can be released simply by rotating the union nut or the cap in the loosening direction by applying a force exceeding the rotational resistance to the union nut or the cap, and the fastening of the union nut or the cap can be easily released.

The lock ring is formed by integrating a separately molded member with the union nut and the cap. This is done for the following reasons.

That is, the union nut and the cap have an internal thread that is screwed to the external thread. When the female screw is formed by a die using a molten resin or the like as a material, it is necessary to rotate and pull out the female screw forming portion of the die when the die is released.

By separately machining and installing the lock ring having the spring ring with the inner surface relief, rotational extraction of the internal thread forming portion of the die becomes impossible. It is thus possible to provide a cantilevered configuration and coils with undulating inner surfaces.

Further, although the lock ring is elastically deformed when the lock portions of the spring coils pass over the above-described snap projections, if the lock ring is independent from the union nut or the cap, the union nut or the cap is not elastically deformed even if the lock ring is elastically deformed.

Therefore, the state of the threaded engagement of the union nut and the cap with respect to the external thread of the connection target member does not become unstable.

The spring ring of the lock ring allows the diameter to be expanded by elastic deformation by providing a clearance at the outer periphery, whereby the lock portion of the spring ring can pass over the engaging protrusion.

Further, by making the inclination angle of the first cam surface of the engaging projection smaller than the inclination angle of the second cam surface, when the union nut or the cap is rotated in the screwing direction, the locking portion of the coil spring can smoothly pass over the engaging projection, and the screwing can be easily performed without any trouble.

In addition, the lock ring formed of resin can be provided with a spring ring that is easily elastically deformed by the property of generating resin.

In the configuration in which the inclination angle of the first inclined surface is set to be smaller than the inclination angle of the first cam surface by several degrees, the contact of the lock portion with respect to the first cam surface is close to the line contact, so that the frictional resistance when the union nut or the cap is rotated in the screwing direction is reduced, and the screwing operation can be performed with a smaller force.

Drawings

Fig. 1 is a cross-sectional view showing an example of a component joint and a spray nozzle unit of the present invention.

Fig. 2 is an exploded perspective view of the component joint and spray nozzle unit of fig. 1.

Fig. 3 is a perspective view of the lock ring provided in the component joint of fig. 1 as viewed from the back side.

Fig. 4 is an enlarged sectional view taken along line IV-IV of fig. 1.

Fig. 5A is a cross-sectional view showing a relationship between the locking portion of the lock ring and the engaging projection when the union nut is rotated in the tightening direction.

Fig. 5B is a cross-sectional view showing a relationship between the locking portion of the lock ring and the engaging projection when the union nut is rotated in the loosening direction.

Fig. 6 is a sectional view showing another example of the spray nozzle unit of the present invention.

Fig. 7 is a top view of the spray nozzle unit of fig. 6.

Fig. 8 is a sectional view showing still another example of the spray nozzle unit of the present invention.

Fig. 9 is a cross-sectional view showing another example of the component joint of the present invention.

Fig. 10 is a side view, partly in section, showing still another example of the spray nozzle unit of the present invention.

Fig. 11 is a front view showing an example of the vehicle-type liquid distribution device.

Detailed Description

Embodiments of the component joint according to the present invention will be described below with reference to fig. 1 to 10 of the drawings. Fig. 1 to 4 show an example of a spray nozzle unit according to the present invention.

The illustrated spray nozzle unit 1 is configured by combining a nozzle holder 10 and a nozzle head 20. The nozzle holder 10 is fixed to the outer periphery of a liquid supply pipe 40 such as a spray bar. The illustrated nozzle holder 10 is a holder in which two members (a main body portion 10a and a pressing member 10b) are coupled to each other by a screw shaft (not illustrated) or the like.

The liquid introduction ロ 11a provided in the main body portion 10a of the nozzle holder 10 is inserted into the through hole 41 provided in the peripheral wall of the liquid supply pipe 40, and the internal flow path of the main body portion and the internal flow path of the liquid supply pipe 40 communicate with each other. Further, the periphery of the liquid introduction ロ 11a is liquid-tightly sealed by the O-ring 15.

The nozzle head 20 is attached to the body 10a of the nozzle holder 10. The nozzle head 20 is configured to include: a nozzle 21 and a component joint 22 for detachably connecting the nozzle 21 to the nozzle holder 10.

The nozzle 21 is provided with a member in which a nozzle plate 21b having a nozzle ロ is assembled to a resin ring 21 a.

The part joint 22 is a part joint of the present invention. The component joint 22 includes: a union nut 23 screwed into the male screw 14 of the body portion 10a, a lock ring 24 attached to the outer periphery of the union nut 23 on the screw-in distal end side so as to be relatively non-rotatable and relatively non-movable in the axial direction, and an engaging projection 25 for engaging the lock ring 24.

A part of the lock ring 24 axially protrudes from the front end of the union nut 23. The lock ring 24 has: an outer ring 24a, an inner flange 24b (see fig. 1) provided to project radially inward on a long side of an inner diameter side of the outer ring, and a spring ring 24c whose free end is cantilevered from a radially inner end of the inner flange in a direction away from the union nut.

Between the inner peripheral surface of the outer ring 24a and the outer peripheral surface of the spring ring 24c, there is an annular gap 24d that allows diameter expansion due to elastic deformation of the spring ring 24 c.

The lock ring 24 inserts a plurality of keys 24e (see fig. 3) provided at a fixed interval in the circumferential direction on the inner circumferential surface of the outer ring 24a into key grooves 23a (see fig. 2) provided in the lock ring fitting portion of the union nut 23, thereby preventing relative rotation with the union nut 23.

Further, as shown in fig. 1, a radial bulging portion 24f (see fig. 3) having a semicircular cross section provided on the inner peripheral surface of the outer ring 24a is fitted into an engagement groove 23b (see fig. 2) provided in the lock ring fitting portion of the union nut 23 and extending discontinuously in the circumferential direction, thereby preventing relative movement in the axial direction with respect to the union nut 23.

As shown in fig. 4, the spring ring 24c has, on the inner peripheral side, mountain-shaped locking portions 24g protruding radially inward at regular intervals in the circumferential direction, and the locking portions 24g are formed by first inclined surfaces S1 inclined in the opposite direction and second inclined surfaces S2 inclined at an obtuse angle and having an inclination angle larger than that of the first inclined surfaces S1.

The engaging projection 25 is provided on the outer periphery of the root of the male screw 14. The engaging projection 25 includes: a first cam surface 25a having a top located radially outward of circles inscribed in the locking portions 24g, respectively, and configured to allow the locking portions 24g to jump up when the union nut 23 is rotated in the tightening direction; and a second cam surface 25b against which the locking portion 24g abuts when the union nut 23 is rotated in the loosening direction.

The first cam surface 25A is inclined in the opposite direction to the second cam surface 25b, and the inclination angle θ 1 of the first cam surface 25A shown in fig. 5A is smaller than the inclination angle θ 2 of the second cam surface 25 b.

With respect to the illustrated component joint 22, the angle of inclination θ 1 is set to about 20 °, the angle of inclination θ 2 is set to about 45 °, and the angle of inclination θ 3 of the second ramps S2 of the spring ring 24c is set to about 25 °. These tilt angles are of course not limited to the exemplified angles.

The inclination angles θ 1 and θ 2 are the inclination angles of the cam surfaces with respect to a line perpendicular to a line connecting the center of the male screw 14 and the top of the engagement projection 25, and the inclination angle θ 3 is the inclination angle of the second inclined surface S2 with respect to a line perpendicular to a line connecting the center of the coil 24c and the groove bottom between the adjacent locking portions 24 g.

In the illustrated spray nozzle unit, four engaging projections 25 are provided at a constant pitch in the circumferential direction, but the object of installation can be achieved by only one engaging projection 25. Further, when a plurality of engaging projections 25 are provided at a fixed pitch in the circumferential direction, it is preferable to apply a uniform force to the locking portion 24g, but it is not necessary to particularly set the pitch of the engaging projections 25 at an equal interval.

The nozzle holder 10, union nut 23, locking ring 24 of the spray nozzle unit 1 of fig. 1 are all formed from polyoxymethylene. This material is preferably a high-strength resin as compared with a metal, but is not limited to polyoxymethylene.

In the component joint 22, when the union nut 23 is screwed and fastened to the male screw 14, the locking portion 24g of the spring ring 24c rides over the first cam surface 25a of the engaging projection 25 provided at the root of the male screw 14 in the vicinity of the fastening end point.

Since the inclination angle θ 1 of the first cam surface 25a is small, the spring coil 24c is elastically deformed and expanded in diameter by the component force generated at the contact portion of the first cam surface 25a and the lock portion 24g, whereby the lock portion 24g smoothly passes over the engaging projection 25.

On the other hand, when the union nut 23 receives vibration in a state of being positioned at the fastening end point, the union nut 23 tends to rotate in the loosening direction due to a force acting on the engagement surface of the screw. At this time, however, the second inclined surface S2 of the lock portion 24g of the lock ring 24 engages with the second cam surface 25B of the engaging projection 25 having a large inclination angle (see fig. 5B), thereby preventing the union nut 23 from loosening.

As already described, when the spring ring 24c is held in the expanded diameter state by the elastic deformation at the position where the lock portion 24g contacts the engagement projection 25, the elastic restoring force of the spring ring 24c is also added to the pressing force of the second inclined surface S2 against the second cam surface 25 b.

Further, the friction force and the elastic restoring force of the screw fitting portion increase as the screwing of the union nut 23 becomes harder. Due to these actions, resistance to rotation of the lock ring 24 in the loosening direction is increased, and loosening of the union nut 23 can be stably prevented.

Fig. 6 shows another example of the spray nozzle unit of the present invention. In the spray nozzle unit 1 of fig. 6, a nozzle holder 10 having a function of switching the direction of the nozzle head 20 is used.

The nozzle holder 10 includes: a first pipe joint 11 formed by a divided member fixed to an outer periphery of a liquid supply pipe 40 such as a spray bar; a second pipe joint 12 connected to the first pipe joint; and a third pipe joint 13 externally embedded in and connected to the second pipe joint.

The second pipe joint 12 is made of two parts, namely: a first divided part 12a in which the rear side of the O-ring 15 is fitted in a liquid-tight manner is inserted into the front end opening of the first pipe joint 11, and a second part (sleeve joint) 12b which is also attached in a liquid-tight manner to the outer periphery of the small-diameter cylindrical portion on the front end side of the first part 12a via the O-ring 15.

The illustrated third pipe joint 13 is an L-shaped joint having a front end bent by 90 ° to a rear portion, and the second member 12b is press-fitted into a hole on the rear portion side of the third pipe joint 13, and the second pipe joint 12 and the third pipe joint 13 are connected so as not to be rotatable relative to each other.

The first pipe joint 11, the second pipe joint 12, and the third pipe joint 13 are each formed of a high-strength resin such as polyacetal, and the press-fitting portion of the second component 12b into the third pipe joint 13 is liquid-tightly sealed without providing a sealing member.

The small-diameter cylindrical portion 12c of the first component 12a of the second pipe joint 12 is inserted into a hole of the third pipe joint 13, and the inside of the distal end side of the third pipe joint 13 is connected to a passage inside the small-diameter cylindrical portion 12c via a communication hole 12d provided midway along the long side of the small-diameter cylindrical portion 12 c. A total of three communication holes 12d are provided at a predetermined pitch (for example, 45 ° pitch) in the circumferential direction.

The nozzle head 20 is connected to the male screw 14 at the front end of the third pipe joint 13 using the component joint 22 already described. Fig. 6 shows a filter 16 provided in the third pipe joint 13 as needed.

In the spray nozzle unit 1 of fig. 6, even the connection of the second pipe joint 12 to the first pipe joint 11 is performed using the component joint 22 already described.

If the union nut 23 of the component joint 22 used for connecting the second pipe joint 12 is loosened, the second pipe joint 12 and the third pipe joint 13 can be rotated together. By this rotation, as shown by a chain line in fig. 7, the connection position of the communication hole 12d with respect to the internal flow path of the third pipe joint 13 and the direction of the nozzle head 20 are switched. The union nut 23 is tightened again to fix the direction of the nozzle head 20.

Fig. 8 shows an example of a spray nozzle unit 1, in which a diaphragm valve 30 for opening and closing a pipeline is incorporated in the middle of the pipeline, in order to prevent a phenomenon that liquid remaining in a liquid supply pipe 40 when liquid spraying is stopped drips from a spray nozzle head 20 at ロ.

The diaphragm valve 30 is assembled by a valve body 32 having a rubber valve film 32a on a cap-shaped valve body 31 and a return spring 33 biasing the valve body in a valve closing direction, and when the liquid is supplied and the internal pressure of the liquid supply pipe 40 increases, the diaphragm valve 30 opens and ejects the liquid from the nozzle head 20, and when the liquid supply stops and the internal pressure of the liquid supply pipe 40 decreases, the diaphragm valve 30 closes and prevents the liquid from dripping from the nozzle head 20.

The diaphragm valve 30 is mounted to the first pipe joint 11A by the already described component joint 22.

The spray nozzle unit 1 of fig. 8 differs from the spray nozzle unit 1 of fig. 6 in that a diaphragm valve 30 is additionally provided by using a first pipe joint 11A having a structure different from that of fig. 6. The other structures are the same as those of the spray nozzle unit 1 of fig. 6, and therefore, the description thereof is omitted.

Fig. 9 shows the component joint 22 in which the union nut is replaced with a bottomed cylindrical cap (cap nut) 26 having a female thread 26 a. The joint 22 using the cap 26 can be used for applications such as sealing the end of a pipe with a cap in an airtight manner.

As the spray nozzle unit 1 for liquid distribution, for example, a unit having a nozzle holder 10 with a branch pipe as shown in fig. 10 is also sold.

In the spray nozzle unit 1, one of the nozzle heads 20 attached to the main pipe 17 and the branch pipe 18 is left and the other is removed, and the tip opening of the removed pipe is closed with a cap having a cylindrical shape having a bottom. The component joint of the present invention can exert its effect even with respect to such stable fixation of the cap portion of the housing.

Description of reference numerals: 1. 1a … spray nozzle unit; 10. 10a … nozzle holder; 10a … body portion; 10b … pressing member; 11. 11a … first pipe fitting; 11a … liquid introduction ロ; 12 … second pipe joint; 12a … first part; 12b … second part; 12c … small diameter cylindrical section; 12d … communication hole 13 … third pipe joint; 14 … external threads; 15 … O-ring; a 16 … filter; 17 … main pipe 18 … branch pipe; 20. 20a … nozzle tip; a 21 … nozzle; 21a … resin ring; 21b … jet plate; 22 … part joint; 23 … union nuts; 23a … keyway; 23b … engagement groove; 24 … locking ring; 24a … outer ring; 24b … inner flange; 24c … spring coil; a 24d … gap; a 24e … key; 24f … radial bulge; a 25g … lock; 25 … snap-fit projections; 25a … first cam surface; 25b … second cam surface; 26 … cap; 26a … internal threads; 30 … diaphragm valve; 31 … a valve body; a 32 … valve cartridge; 32a … valve membrane; 33 … restoring spring; 40 … liquid supply tube; 41 … through holes; 50 … wagon; 51 … spray bar; s1 … a first slope; s2 … second inclined plane; θ 1 … angle of inclination of the first cam surface; θ 2 … angle of inclination of the second cam surface; theta 3 … the angle of inclination of the second ramp of the lock.

Claims

1. A component joint which is provided with a union nut (23) and a connection object component having a male screw (14) at an end portion thereof, and which is attached so that the union nut (23) is screwed into the male screw (14) of the connection object component,

the component joint has a lock ring (24) that is mounted on the outer periphery of the union nut (23) on the screw-in front end side so as to be relatively non-rotatable and non-axially movable, and the lock ring that has a portion projecting in the axial direction from the front end of the union nut (23) has: an outer ring (24 a); an inner flange (24 b) provided on the middle of the long side on the inner diameter side of the outer ring so as to protrude radially inward; a spring ring (24c) supported in a cantilever manner, the free end of which extends from the radially inner end of the inner flange in a direction away from the union nut, a gap (24 d) allowing for an expansion caused by elastic deformation of the spring ring (24c) being present between the inner peripheral surface of the outer ring (24 a) and the outer peripheral surface of the spring ring (24c),

the spring ring (24c) has, on the inner peripheral side, mountain-shaped locking portions (24g) protruding radially inward at a fixed pitch in the circumferential direction, the locking portions (24g) being formed by a first inclined surface (S1) inclined in the opposite direction and a second inclined surface (S2) having an inclination angle larger than that of the first inclined surface intersecting at an obtuse angle, the connection target member having, on the outer periphery of the root end side of the male screw (14), at least one engaging projection (25) which engages with the locking portions (24g) and protrudes radially outward from a circle inscribed in each of the locking portions,

the engaging projection (25) includes: a first cam surface (25a) with a small inclination angle for the lock portion to jump up when the union nut (23) rotates in the tightening direction, and a second cam surface (25b) with a larger inclination angle than the first cam surface for the lock portion (24g) to abut against when the union nut (23) rotates in the loosening direction.

2. The component joint according to claim 1,

the engaging projections (25) are provided at a fixed pitch in the circumferential direction.

3. A component joint is provided with: a cap (26) having a bottomed cylindrical shape and having a female screw (26 a), and a member to be connected having a male screw (14) at an end thereof, the male screw (14) being screwed into the female screw (26 a), and the cap (26) and the male screw (14) being screwed together,

the component joint has a lock ring (24) that is mounted on the outer periphery of the cap portion (26) on the screw-in front end side so as to be relatively non-rotatable and non-axially movable, and the lock ring that has a portion projecting in the axial direction from the front end of the cap portion (26) has: an outer ring (24 a); an inner flange (24 b) provided on the middle of the long side on the inner diameter side of the outer ring so as to protrude radially inward; a cantilevered-supported spring ring (24c) whose free end extends from the radially inner end of the inner flange in a direction away from the cap portion (26), a gap (24 d) that allows for expansion by elastic deformation of the spring ring (24c) being present between the inner peripheral surface of the outer ring (24 a) and the outer peripheral surface of the spring ring (24c),

the engaging projection (25) includes: a first cam surface (25a) with a small inclination angle for the lock portion to jump up when the cap (26) is rotated in the tightening direction, and a second cam surface (25b) with a larger inclination angle than the first cam surface for the lock portion (24g) to abut on when the cap (26) is rotated in the loosening direction.

4. The component joint according to claim 3,

5. A spray nozzle unit for dispensing a liquid,

the disclosed device is provided with: a nozzle holder (10) having an internal flow path and to which a connection object is to be connected, and a nozzle head (20) combined with the nozzle holder,

the nozzle head (20) is configured to include: a nozzle (21) having a spout, and a component adapter (22) connecting the nozzle to the nozzle holder (10),

the member joint of claim 1 or 2 provided with a union nut (23) and a spring ring (24c) is used as the member joint (22),

the nozzle (21) is fastened to the union nut (23) screw-engaged with the external thread (14) of the front end of the nozzle holder (10) to be fixed to the front end of the nozzle holder (10).