TWI710407B - Member joint and spray nozzle unit using the same - Google Patents

Abstract

The lock ring (24) is installed in such a way that it cannot rotate relative to the outer circumference of the engagement nut (23) and is not relatively movable in the axial direction. On the spring ring (24c) supported by a single side provided on the lock ring, in the inner The circumferential side is provided with a mountain-shaped locking part (24g) formed by the first slope (S1) and the second slope (S2) inclined at an obtuse angle at a constant pitch in the circumferential direction. At least one engagement protrusion (25) is provided on the outer periphery of the root end side of the thread (14) to engage with the locking portion (24g). When the engagement nut (23) is rotated in the tightening direction, the locking portion (24g) Over the first cam surface (25a) of the engaging protrusion (25), when the engaging nut (23) rotates in the loosening direction, the locking portion (24g) abuts against the second cam surface (25b) of the engaging protrusion (25) ) To prevent loosening of the joint nut (23). The joint nut (23) can be replaced with a bottomed cylindrical cover member (26).

Description

Component joint and spray nozzle unit using it

The present invention relates to a component joint for screwing an engagement nut or cap nut to prevent loosening of the male thread of the pipe end. In detail, it relates to a stable operation at the end of screwing Loose prevention, on the other hand, a component joint that can be easily screwed off, and a spray nozzle unit for spraying liquid that connects the nozzle to the nozzle holder.

The applicant of the present invention has developed a joint that uses a joint nut to connect two components. With this joint, the joint nut can be reliably prevented from rotating due to the relative rotation of the two components, and it is commercialized (Refer to Patent Document 1 below).

The rotation of the joint nut caused by the relative rotation of the two components will cause the loosening of the fastening (the connection of the nut).

For example, as shown in FIG. 11, in a vehicle-mounted liquid spraying device, a work boom 51 installed on a transport vehicle 50 is used to install a plurality of the aforementioned spray nozzle units 1A to efficiently spray chemicals and the like method.

The structure of the spray nozzle unit 1A of FIG. 11 includes a nozzle holder 10A installed on a working boom 51 and a spray head 20A connected to the nozzle holder.

The nozzle is screwed on the joint nut of the nozzle holder and fastened by the joint nut A combination of nozzles fixed on the nozzle holder.

In such a liquid spray device, due to the vibration in use, the fastening of the nozzle by the joint nut is loosened, and the loosening causes the nozzle to rotate, and there is a change in the direction of the spray to the direction that is contrary to the intention, and the uniformity cannot be performed. The spray situation.

Therefore, the component joint of Patent Document 1 is rotatably installed with a lock ring on the outer periphery of the engagement nut, and the engagement nut screwed to the male thread of the nozzle holder connected to the other party attempts to loosen the thread separately from the nozzle holder. When rotating in the direction, the locking pawl provided on the aforementioned locking ring will be sandwiched between the protrusion provided on the nozzle holder and the clamping piece provided on the engagement nut.

The locking ring is prevented from rotating by the protrusion and the clamping piece sandwiching the locking pawl, and the non-rotatable locking ring is used to reliably prevent the engagement nut from rotating in the loosening direction.

[Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Invention Patent No. 4917190

Since the component joint of Patent Document 1 has a mechanism that when the engaging nut attempts to rotate in the loosening direction, the locking pawl provided on the locking ring is clamped between the protrusion provided on the nozzle holder and the clamping piece provided on the engaging nut It is constructed to prevent the lock ring from loosening extremely firmly.

However, when releasing the fastening of the engagement nut, it is necessary to rotate the lock ring separately in the fastening direction of the engagement nut, and fix the engagement nut and the lock ring at the position where the lock claw abuts on the clamping piece. The relative position of the joint nut and the lock ring are rotated in the loosening direction at the same time while maintaining this state, and the operability is not necessarily good.

What happens from time to time in the liquid spraying device is to replace the nozzle of the spray head with a different shape If you want to change the direction of the nozzle, it is necessary to temporarily loosen the fastening of the nozzle.

If it is a liquid spraying device with a low frequency of nozzle replacement or orientation change, it is sufficient to use the component joint of Patent Document 1. However, as shown in FIG. 11, a plurality of units are installed relative to one work boom 51 Among the liquid spraying devices of the spray nozzle unit 1A, especially for devices that frequently replace nozzles or change the spray direction, it is advantageous to be able to release the nozzles simply and quickly from the fastening of the spray head 20A.

The component joint of Patent Document 1 has a structure that cannot be said to be sufficiently simplified.

Therefore, the subject of the present invention is to form the component joint with a simple structure to stably prevent the loosening of the joint nut or cap nut at the screwing end point, and at the same time, the joint nut or cap can be easily performed The operator for loosening the screw cap; and provides a spray nozzle unit for spraying liquid that uses the component joint to connect the nozzle to the nozzle holder.

In order to solve the above-mentioned problems, the present invention is provided with an engagement nut and a connecting partner member having a male thread at the end, and a lock ring is provided for mounting the engagement nut on the male thread of the connecting partner member. The component joint is installed in a non-rotatable and axially non-movable manner relative to the outer periphery of the screwed-in front end side of the aforementioned engagement nut. The locking ring makes a part of the engagement nut protrude in the axial direction from the front end of the engagement nut and has: an outer ring; An inner flange protruding from the inner diameter portion of the outer ring toward the radially inner side; and a single-sided spring ring supported from the radially inner end of the inner flange toward the free end away from the joint nut Extending in the direction; and between the inner peripheral surface of the outer ring and the outer peripheral surface of the spring ring, there is a gap allowing the diameter expansion caused by the elastic deformation of the spring ring, and the spring ring is on the inner peripheral side There is a mountain-shaped locking portion at a constant pitch in the circumferential direction, which intersects at an obtuse angle from a first inclined surface inclined in the reverse direction and a second inclined surface larger than the first inclined surface The connection partner member has at least one engagement protrusion on the outer circumference of the root end side of the male thread, which is inwardly connected to the lock portion than the lock portion is engaged with. The circles of each project further outward in the radial direction, and the engaging protrusion is provided with: a first cam surface, which when the engaging nut rotates in the tightening direction, the inclination angle that the locking portion climbs is small; and 2. A cam surface whose inclination angle is greater than the first cam surface abutted by the lock portion when the engagement nut rotates in the loosening direction.

The aforementioned locking ring is preferably formed of resin such as polyacetal. The aforementioned joint nut and nozzle holder are preferably formed of resin such as polyacetal in the same manner.

Furthermore, for the component joint, it is preferable to set the inclination angle of the second inclined surface of the spring ring to be larger than the inclination angle of the first inclined surface, and it is preferable to set the inclination angle of the first inclined surface to It is a few degrees smaller than the inclination angle of the aforementioned second cam surface.

The present invention also provides a spray nozzle unit for liquid spraying, which includes: a nozzle holder connected to each other and equipped with an internal flow passage; and a spray head combined with the nozzle holder; and the structure of the spray head includes a nozzle holder The nozzle and the component joint that connects the nozzle to the nozzle holder; as the component joint, the component joint equipped with a coupling nut and a spring ring is used. The nozzle is fastened to the male thread of the front end of the nozzle holder The aforementioned engagement nut screwed on is fixed to the front end of the aforementioned nozzle holder.

The spray nozzle unit may also be one that incorporates a filter that allows the liquid sprayed from the nozzle to pass through the nozzle holder.

It can be considered that the aforementioned coupling nut of the component joint of the present invention can also be replaced with a bottomed cylindrical cap part (a cap-shaped nut) with a female thread. Although the component joint using this bottomed cylindrical cover part cannot be used to connect the nozzle of the spray nozzle unit to the nozzle holder, it can be used to airtightly lock the end of the pipeline with the cover part.

In addition, a component joint with an engagement nut can also be used, for example, in a case where the nozzle holder is connected to the first pipe joint fixed to a working boom in a liquid-tight and relatively rotatable manner. The second pipe joint of the pipe joint and the third pipe joint non-rotatably externally fitted with respect to the second pipe joint are constructed, and the second pipe joint relative to the first pipe joint Connect the nozzle to the third pipe joint.

In addition, it can also be used in a situation where a diaphragm valve for opening and closing a pipeline that is assembled in the middle of the pipeline is attached to the first pipe joint of the valve holder using a member joint including an engagement nut.

In the component joint of the present invention, if the coupling nut or the cover part of the mounting lock ring is screwed on the male thread of the connecting member and gradually tightened, the locking part of the spring ring will climb on the card provided on the connecting member.合projection.

Since this climbing system lock portion is in contact with the first cam surface of the engaging protrusion with a small inclination angle, even if a large tightening force is not applied, the lock portion will go over the engaging protrusion, thereby engaging the nut Or the fastening of the cover part can be carried out smoothly without great force.

On the other hand, when the engagement nut or the cover member is subjected to vibrations, the second inclined surface provided on the locking portion of the lock ring engages with the second cam surface provided on the engaging protrusion of the connecting partner member, thereby preventing Looseness of the coupling nut or cover part for installing the locking ring.

On the coupling nut or cover part screwed on the male thread of the connected component, the force that attempts to rotate in the loosening direction (reverse rotation) is applied due to the influence of the lead of the thread.

In addition, the male thread connecting the counterpart member is formed of resin, and especially when the joint nut or the cover member is also formed of resin, the male thread and the female thread, which are elastically deformed due to tightening, attempt to elastically recover, so there is also Axial force is applied.

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

At the position where the locking portion is in contact with the engaging protrusion, the elastic restoring force of the spring ring is also added to the second inclined surface to the second inclined surface when the expanded diameter state of the spring ring due to elastic deformation is maintained. The pressing force of the cam surface, by this, rotates relative to the loosening direction of the lock ring, and resistance is applied.

The stronger the tightening of the engagement nut is, the greater the frictional force and the elastic restoring force of the threaded fitting part, and the greater the resistance to rotation relative to the loosening direction. Therefore, as long as no force is applied to overcome the resistance, the lock ring cannot go over the aforementioned engagement protrusion and rotate.

Since the engagement nut or the cover member is to install the lock ring in a relatively non-rotatable manner, the rotation of the lock ring under the vibration level is prevented from being continued without rotating in the loosening direction.

In addition, the lock ring rotates together with the engagement nut or the cover member. Therefore, simply by applying a force that overcomes the rotation resistance to the engagement nut or the cover member to simply rotate it in the loosening direction, the engagement of the lock portion with the engagement protrusion can be released, and the engagement screw can be easily released. Fastening of cap or cover parts.

In addition, the aforementioned locking ring system integrates a separately formed member with an engagement nut or a cover member. This approach is due to the following reasons.

That is, the engaging nut or the cover member has a female thread that is screwed to the male thread. If the female thread is formed using a mold using molten resin or the like as a material, it is necessary to rotate the female thread forming part of the mold to pull out when the mold is demolded.

By separately processing and installing the lock ring with the spring ring whose inner surface is corrugated, it is not impossible to rotate and pull out the female thread forming part of the mold. Thereby, a spring ring with a structure supported by one side and a corrugated inner surface can be provided.

In addition, the lock ring is elastically deformed when the lock portion of the spring ring passes over the aforementioned engagement protrusion. However, as long as the lock ring is independent from the engagement nut or the cover member, even if the lock ring is elastically deformed, the engagement nut or the cover member is still No elastic deformation occurs.

Therefore, there is no situation in which the screwing state of the engagement nut or the cover member with respect to the male thread of the connection partner is unstable.

Since the spring ring of the lock ring is provided with a gap on the outer periphery, the diameter expansion caused by elastic deformation is allowed, so that the lock portion of the spring ring can go over the engaging protrusion.

In addition, by setting the inclination angle of the first cam surface of the engagement protrusion to be smaller than the inclination angle of the second cam surface, when the engagement nut or the cover member is rotated in the tightening direction, the locking portion of the spring ring can be It smoothly crosses the engaging protrusions, and can be tightened easily and without obstacles.

In addition, the lock ring formed of resin can utilize the characteristics of the resin to provide a spring ring that is easy to elastically deform.

In addition, the inclination angle of the first inclined surface is set to be a few degrees smaller than the inclination angle of the first cam surface, so that the contact of the locking portion with the first cam surface becomes close to line contact, and the lowering makes the engagement nut or The frictional resistance when the cover part rotates in the tightening direction, so that the tightening operation can be performed with less force.

1: Spray nozzle unit

1A: Spray nozzle unit

10: Nozzle holder

10A: Nozzle holder

10a: body part

10b: pressing member

11: No. 1 pipe joint

11a: Liquid inlet

11A: No. 1 pipe joint

12: 2nd pipe joint

12a: Part 1

12b: The second accessory (bamboo shoot male thread socket)

12c: Small diameter cylinder

12d: Connecting hole

13: No. 3 pipe joint

14: Male thread

15: O-ring

16: filter

17: Supervisor

18: branch pipe

20: nozzle

20A: Nozzle

21: Nozzle

21a: resin ring

21b: spray plate

22: component joint

23: Joint nut

23a: fixed wedge groove

23b: Snap slot

24: Locking ring

24a: outer ring

24b: inner flange

24c: spring ring

24d: gap

24e: fixed wedge

24f: radial bulge

24g: Locking part

25: Snap protrusion

25a: 1st cam surface

25b: 2nd cam surface

26: cover parts

26a: Female thread

30: Diaphragm valve

31: Valve body

32: Valve body

32a: Valve diaphragm

33: return spring

40: Liquid supply pipe

41: Through hole

50: truck

51: Working boom

IV-IV: Line

S1: The first slope

S2: 2nd slope

θ1: The inclination angle of the first cam surface

θ2: The inclination angle of the second cam surface

θ3: The inclination angle of the second slope of the locking part

Fig. 1 is a cross-sectional view showing an example of the component joint and 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 locking ring provided on the component joint of Fig. 1 viewed from the back side.

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

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

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

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

Fig. 7 is a plan view of the spray nozzle unit of Fig. 6;

Fig. 8 is a cross-sectional view of 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 partially broken away of another example of the spray nozzle unit of the present invention.

Fig. 11 is a front view showing an example of a vehicle-mounted liquid spraying device.

Hereinafter, an embodiment of the component joint of the present invention will be described based on FIGS. 1 to 10 of the drawings. Figures 1 to 4 show an example of the spray nozzle unit of the present invention.

The spray nozzle unit 1 shown in the figure is constructed by combining the nozzle holder 10 and the spray head 20. The nozzle holder 10 is fixed to the outer periphery of a liquid supply pipe 40 such as a working boom. The nozzle holder 10 shown in the figure is divided into two, and two members (the body portion 10a and the pressing member 10b) are connected by a screw shaft (not shown) or the like.

The liquid introduction port 11a provided in the main body 10a of the nozzle holder 10 is inserted into the through hole 41 provided in the peripheral wall of the liquid supply tube 40, and the internal flow passage of the main body communicates with the internal flow passage of the liquid supply tube 40. In addition, the periphery of the liquid introduction port 11a is sealed by an O-ring 15 in a liquid-tight manner.

The aforementioned spray head 20 is mounted on the body portion 10a of the nozzle holder 10. The structure of the spray head 20 includes a nozzle 21; and a component joint 22 that connects the nozzle 21 to the nozzle holder 10 in a fixed and detachable manner.

The nozzle 21 is provided as a nozzle plate 21b with nozzles assembled to the resin ring 21a.

The component joint 22 is the component joint of the present invention. The component joint 22 includes: an engagement nut 23 that is screwed to the male thread 14 of the body portion 10a; a lock ring 24 that is non-rotatable and axially non-rotatable relative to the outer periphery of the screw-in front end side of the engagement nut 23 Movably installed; and the engaging protrusion 25, which makes the locking ring 24 engage.

A part of the lock ring 24 protrudes axially from the front end of the engagement nut 23. The lock ring 24 has: an outer ring 24a; an inner flange 24b (refer to FIG. 1), which protrudes radially inwardly midway in the longitudinal direction of the inner diameter side of the outer ring; and a spring ring 24c supported on one side , Which extends from the radially inner end of the inner flange to the free end in a direction away from the engagement nut.

Between the inner peripheral surface of the outer ring 24a and the outer peripheral surface of the spring ring 24c, there is a ring-shaped gap 24d that allows the diameter expansion caused by the elastic deformation of the spring ring 24c.

The lock ring 24 is inserted into a plurality of fixed wedges 24e (refer to FIG. 3) provided at a constant pitch in the circumferential direction on the inner peripheral surface of the outer ring 24a into the fixed wedge grooves 23a provided in the outer insert of the locking ring of the engagement nut 23 (Refer to FIG. 2) to prevent relative rotation with the engagement nut 23.

In addition, the radially bulging portion 24f (refer to FIG. 3) provided on the inner peripheral surface of the outer ring 24a with a semicircular cross-section, as shown in FIG. 1, falls into the outer fitting of the lock ring provided on the engagement nut 23 The engagement groove 23b (refer to FIG. 2) that extends discontinuously in the circumferential direction prevents the relative movement of the engagement nut 23 in the axial direction.

The aforementioned spring ring 24c has a mountain-shaped locking portion 24g at a constant pitch in the circumferential direction on the inner peripheral side as shown in FIG. 4, which is formed from a first inclined surface S1 inclined in the opposite direction and an inclined angle greater than the first inclined surface S1 The second inclined surface S2 is formed by crossing at an obtuse angle, and protrudes radially inward.

The aforementioned engaging protrusion 25 is provided on the outer circumference of the root of the male thread 14. The top of the engaging protrusion 25 is located more radially outward than the circle of each of the locking portions 24g inscribed, and has a first cam that the locking portion 24g climbs when the engaging nut 23 rotates in the tightening direction Face 25a, connected with The second cam surface 25b that the lock portion 24g abuts when the closing 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 θ1 of the first cam surface 25a shown in FIG. 5A is smaller than the inclination angle θ2 of the second cam surface 25b.

Regarding the illustrated component joint 22, the inclination angle θ1 is approximately 20°, the inclination angle θ2 is approximately 45°, and the inclination angle θ3 of the second inclined surface S2 of the spring ring 24c is approximately 25°. Of course, these inclination angles are not limited to the illustrated angles.

The inclination angles θ1 and θ2 referred to here are the inclination angles of each cam surface with respect to the line perpendicular to the line connecting the center of the male thread 14 and the top of the engaging protrusion 25, and the inclination angle θ3 is the inclination angle of the second inclined surface S2 with respect to The inclination angle of the line perpendicular to the line connecting the center of the spring ring 24c and the bottom of the groove between the adjacent locking portion 24g.

In the illustrated spray nozzle unit, four aforementioned engaging protrusions 25 are provided at a constant pitch in the circumferential direction, but at least one engaging protrusion 25 can achieve this purpose. In addition, it is preferable that the engaging protrusions 25 are provided at a constant pitch in the circumferential direction in plural, and the force is evenly applied to the locking portion 24g, but the installation pitch of the engaging protrusions 25 is not particularly set to be equal Necessity of interval.

Any one of the nozzle holder 10, the joint nut 23, and the lock ring 24 of the spray nozzle unit 1 of FIG. 1 is formed of polyacetal. Regarding the material, high-strength resin is better than metal, but it is not limited to polyacetal.

If the component joint 22 is screwed to the male thread 14 and gradually tightened, the locking portion 24g of the spring ring 24c climbs on the engaging protrusion 25 provided at the root of the male thread 14 near the end of the tightening. The first cam surface 25a.

Since the inclination angle θ1 of the first cam surface 25a is small, the spring ring 24c is elastically deformed and expands in diameter due to the component force generated by the contact portion between the first cam surface 25a and the locking portion 24g, whereby the lock The fixed portion 24g passes over the engagement protrusion 25 smoothly.

On the other hand, if the engagement nut 23 is subjected to vibration in a state where it is located at the end of the tightening, the engagement nut 23 attempts to rotate in the loosening direction due to the force acting on the engagement surface of the thread. However, at this time, the second inclined surface S2 of the locking portion 24g of the lock ring 24 is engaged with the second cam surface 25b (refer to FIG. 5B) with a large inclination angle of the engaging protrusion 25, thereby preventing loosening of the engaging nut 23 .

As described above, at the position where the locking portion 24g is in contact with the engaging protrusion 25, the elastic restoring force of the spring ring 24c is also added to the second slope when the expanded diameter state of the spring ring 24c due to elastic deformation is maintained S2 is the pressing force against the second cam surface 25b.

In addition, the stronger the tightening of the engagement nut 23 is, the more the frictional force and the elastic restoring force of the threaded fitting portion increase. Under the action of this, the resistance to the rotation of the lock ring 24 in the loosening direction becomes larger, and the loosening of the engagement nut 23 is prevented and stabilized.

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 that provides a function of switching the direction of the spray head 20 is used.

The configuration of the nozzle holder 10 includes: a first pipe joint 11, which includes a bisected member fixed to the outer circumference of a liquid supply pipe 40 such as a working boom, and a second pipe joint 12, which is connected to the first Pipe joint; and the third pipe joint 13, which is externally connected to the second pipe joint.

The structure of the second pipe joint 12 includes the following two parts: a first fitting 12a, which is fitted with an O-ring 15 on its rear side to be liquid-tightly inserted into the front end opening of the first pipe joint 11 and divided into two; and 2 The fitting (bamboo shoot external thread socket) 12b is installed on the outer circumference of the small-diameter cylindrical part on the front end side of the first fitting 12a with an O-ring 15 interposed therebetween for liquid-tight installation.

The third pipe joint 13 shown in the figure is an L-shaped joint whose front end is bent at 90° with respect to the rear side. The second fitting 12b is pressed into the hole on the rear side of the third pipe joint 13, and the second pipe joint 12 It is connected to the third pipe joint 13 so as not to rotate relatively.

Any one of the first pipe joint 11, the second pipe joint 12, and the third pipe joint 13 is made of a high-strength resin such as polyacetal, and is compared to the press-fitting portion of the second fitting 12b of the third pipe joint 13 Liquid-tight sealing is possible without sealing material.

The small diameter cylindrical portion 12c of the first fitting 12a of the second pipe joint 12 is inserted into the hole of the third pipe joint 13, and the interior of the front end side of the third pipe joint 13 passes through the longitudinal direction of the small diameter cylindrical portion 12c. The connecting hole 12d in the middle is connected to the internal passage of the small-diameter cylindrical portion 12c. A total of three communicating holes 12d are provided at a specific pitch (for example, 45° pitch) in the circumferential direction.

The nozzle 20 is connected to the male thread 14 at the front end of the third pipe joint 13 by using the component joint 22 described above. Figure 6 No. 16 is a filter installed in the third pipe joint 13 as necessary.

The connection between the second pipe joint 12 of the spray nozzle unit 1 of FIG. 6 and the first pipe joint 11 is also performed by the aforementioned component joint 22.

If the joint nut 23 of the component joint 22 used for the connection of the second pipe joint 12 is loosened, the second pipe joint 12 and the third pipe joint 13 can be rotated together. With this rotation, as shown by a dotted chain line in FIG. 7, the connection position with respect to the communication hole 12 d of the internal flow passage of the third pipe joint 13 and the orientation of the nozzle head 20 are switched. Then, the joint nut 23 is tightened again to fix the orientation of the spray head 20.

Fig. 8 shows the purpose of preventing the liquid remaining in the liquid supply pipe 40 from dripping from the nozzle of the nozzle 20 when the spray of the liquid is stopped, and a diaphragm valve 30 for opening and closing the pipe is assembled in the middle of the pipe. An example of the spray nozzle unit 1.

In the diaphragm valve 30, a valve body 32 having a rubber diaphragm 32a and a return spring 33 that urges the valve body in the valve closing direction are assembled in a cap-shaped valve body 31. If liquid is supplied, the liquid supply pipe 40 When the internal pressure increases, the diaphragm valve 30 opens and the liquid is ejected from the spray head 20. If the supply of liquid stops and the internal pressure of the liquid supply pipe 40 drops, the diaphragm valve 30 closes to prevent the liquid Drops from the nozzle 20.

The installation of the diaphragm valve 30 with respect to the first pipe joint 11A is performed using the aforementioned component joint 22.

The spray nozzle unit 1 of FIG. 8 is different from the spray nozzle unit 1 of FIG. 6 in that the first pipe joint 11A having a different structure from that of FIG. Since the other structure is the same as that of the spray nozzle unit 1 of FIG. 6, the description is omitted.

FIG. 9 shows the component joint 22 in which the joint nut is replaced with a bottomed cylindrical cap member (cap nut) 26 having a female thread 26a. The component joint 22 using the cover member 26 can be used for the purpose of airtightly closing the end of the pipeline with the cover member.

As the spray nozzle unit 1 for liquid spraying, for example, a nozzle holder 10 with a branch pipe as shown in FIG. 10 is also commercially available.

For such spray nozzle unit 1, one of the nozzles 20 respectively installed on the main pipe 17 and the branch pipe 18 is left, and the other is removed, and the front end of the removed pipe is opened with a bottomed cylindrical cover When the component is blocked and used. In such a case, the component joint of the present invention can also be effective for the stable fixing of the cover part.

10: Nozzle holder

10a: body part

14: Male thread

21: Nozzle

21a: resin ring

21b: spray plate

23: Joint nut

23a: fixed wedge groove

23b: Snap slot

24: Locking ring

24a: outer ring

24b: inner flange

24c: spring ring

24d: gap

24e: fixed wedge

24f: radial bulge

25: Snap protrusion

25a: 1st cam surface

25b: 2nd cam surface

Claims (5)

A component joint comprising: an engagement nut (23); and a connection counterpart component having a male thread (14) at the end; and the aforementioned engagement nut (23) is screwed to the male thread of the connection counterpart component (14) The installed component joint (22) has: a lock ring (24) that is not rotatable and axially non-rotatable with respect to the outer periphery of the screwed-in front end side of the aforementioned engagement nut (23) Installed in relative movement, the lock ring makes a part of it protrude from the front end of the aforementioned engagement nut (23) toward the axial direction, and has: an outer ring (24a); an inner flange (24b) on the inner diameter of the outer ring A spring ring (24c) supported by a single side, which extends from the radially inner end of the inner flange with a free end in the direction away from the engaging nut; and in the aforementioned outer ring ( Between the inner circumferential surface of 24a) and the outer circumferential surface of the spring ring (24c), there is a gap (24d) that allows the diameter expansion caused by the elastic deformation of the spring ring (24c), and the spring ring (24c) There are mountain-shaped locking portions (24g) on the inner peripheral side at a constant pitch in the circumferential direction, which form an obtuse angle from a first inclined surface (S1) inclined in the opposite direction to a second inclined surface (S2) that is larger than the first inclined surface It is formed by intersecting and protruding radially inwardly, and the connecting counterpart member has at least one engaging protrusion (25) on the outer periphery of the root end side of the male thread (14), which is higher than the locking portion (24g) The circle of each of the locking portions inwardly connected to the locking portion protrudes radially outward, and the engaging protrusion (25) is provided with: a first cam surface (25a), which faces tightly on the engaging nut (23) When rotating in the solid direction, the inclination angle climbed by the locking portion is smaller; and the second cam surface (25b), which has a lower inclination angle than the locking portion (24g) when the engaging nut (23) rotates in the loosening direction ) The first cam surface abutted is large. The component joint of claim 1, wherein a plurality of the aforementioned engaging protrusions (25) are provided at a constant pitch in the circumferential direction. A component joint comprising: a bottomed cylindrical cover part (26) having a female thread (26a); and a connection counterpart component having a male thread (14) for screwing the aforementioned female thread (26a) at the end ); It is a component joint (22) installed by screwing the aforementioned cover part (26) to the male thread (14); it has: a locking ring (24), which is opposite to the aforementioned cover part (26) ) Screwed into the front end side of the outer periphery non-rotatable and non-movable in the axial direction, the locking ring makes a part of the front end of the cover member (26) protrude in the axial direction, and has: outer ring (24a); inner flange (24b), which protrudes from the inner diameter portion of the outer ring toward the radially inner side; and a unilaterally supported spring ring (24c), which extends from the radially inner end of the inner flange to the free end away from the aforementioned The cover member (26) extends in the direction; and between the inner peripheral surface of the outer ring (24a) and the outer peripheral surface of the spring ring (24c), there is an allowance for the elastic deformation of the spring ring (24c) The expanded diameter gap (24d), and the aforementioned spring ring (24c) has a mountain-shaped locking portion (24g) on the inner peripheral side at a constant pitch in the circumferential direction, which is formed by the first slope (S1) inclined in the opposite direction from the The second inclined surface (S2) with a larger inclination angle of the first inclined surface intersects at an obtuse angle and protrudes radially inward, and the connecting partner member has at least 1 on the outer circumference of the root end side of the male thread (14) Each of the engaging protrusions (25) protrudes radially outward than the circle of each of the locking portions (24g) engaged with the locking portion (24g), and the engaging protrusions (25) are provided with: The cam surface (25a), the inclination angle that the locking part climbs is small when the cover member (26) rotates in the tightening direction; and the second cam surface (25b), which is on the cover member (26) When rotating in the release direction, the inclination angle is larger than the first cam surface abutted by the aforementioned locking portion (24g). The component joint of claim 3 is provided with a plurality of the aforementioned engaging protrusions (25) at a constant pitch in the circumferential direction. A spray nozzle unit for spraying liquid, comprising: a nozzle holder (10) connected to each other and equipped with an internal flow path; and a spray head (20) combined with the nozzle holder; and the structure of the aforementioned spray head (20) Containing: a nozzle (21) with a nozzle and a component joint (22) connecting the nozzle to the nozzle holder (10); as the component joint (22), a joint nut (23) and a spring ring (24c) are used ) Such as the component joint of claim 1 or 2; and the aforementioned nozzle (21) is fastened to the aforementioned engagement nut (23) screwed with the male thread (14) of the front end of the aforementioned nozzle holder (10) and It is fixed to the front end of the nozzle holder (10).

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