TW201812186A - Member joint and spray nozzle unit using the same - Google Patents

Abstract

A locking ring (24) is attached to the outer periphery of a union nut (23) so as to be incapable of relative rotation and relative axial-direction movement; peaked locking parts (24g), formed by obtuse-angle intersections between first inclined surfaces (S1) and second inclined surfaces (S2) inclined in opposite directions, are provided at a constant pitch in a circumferential direction to the inner peripheral side of a cantilever supporting spring ring (24c) provided to the locking ring; one or more engaging protrusions (25), with which the locking parts (24g) engage, are provided to the outer periphery on the proximal-end side of an external thread (14) provided to a connecting counterpart member; the locking parts (24g) move beyond first cam surfaces (25a) of the engaging protrusions (25) when the union nut (23) rotates in a tightening direction; and when the union nut (23) rotates in a loosening direction, the locking parts (24g) come into contact with second cam surfaces (25b) of the engaging protrusions (25), preventing the union nut (23) from loosening. The union nut (23) can be replaced by a bottomed cylindrical cap (26).

Description

Component joint and spray nozzle unit using the same

The present invention relates to a component joint for screwing a joint nut or a cap nut to prevent loosening of a male thread with respect to a pipe end, and in particular, it relates to a method for stably performing Loose stop, on the other hand, a component joint that can be easily unscrewed and a spray nozzle unit for liquid spraying that uses the nozzle to a nozzle holder.

The applicant of the present invention has developed a joint that uses a joint nut to connect two members, and the joint can reliably prevent the joint nut from turning together due to the relative rotation of the two members, and commercialize it. (See Patent Document 1 below). Rotation of the joint nut caused by the relative rotation of the two components will cause loosening of the fastening (connection of the nut). For example, as shown in FIG. 11, in a vehicle-mounted liquid spraying device, a plurality of the aforementioned spray nozzle units 1A are mounted on a work boom 51 mounted on a transport truck 50 to efficiently spray a medicine or the like. method. The configuration of the spray nozzle unit 1A of FIG. 11 includes a nozzle holder 10A mounted on the work boom 51 and a nozzle 20A connected to the nozzle holder. The spray head is a combination of a joint nut screwed to the nozzle holder and a nozzle fastened to the nozzle holder by the joint nut. In such a liquid spray device, due to vibration in use, the fastening of the nozzle using the joint nut is loosened, and due to the looseness, the nozzle is rotated, and there is a change in the direction of the spray in the direction contrary to the intention, and the uniform Spray situation. Therefore, in the component joint of Patent Document 1, a lock ring is rotatably mounted on the outer periphery of the joint nut, and the joint nut screwed to the male thread of the nozzle holder connected to the counterpart is intended to loosen the thread separately from the nozzle holder. When rotating in the direction, the locking claw provided on the lock ring is sandwiched between a protrusion provided on the nozzle holder and a clamping piece provided on the engaging nut. The locking ring is prevented from rotating by the protrusion and the clamping piece being sandwiched by the locking claw, and the non-rotatable locking ring is used to surely prevent the engaging nut from rotating in the loosening direction. [Prior Art Document] [Patent Document] [Patent Document 1] Japanese Invention Patent No. 4917190

[Problems to be Solved by the Invention] Since the component joint of Patent Document 1 has an attempt to rotate the engaging nut in a loose direction, the locking claw provided on the locking ring is sandwiched between the protrusion provided on the nozzle holder and the engaging screw. The structure between the cap's clamping pieces prevents the loosening of the lock ring extremely securely. However, when releasing the fastening of the joint nut, it is necessary to rotate the lock ring in the tightening direction of the joint nut separately, and fix the joint nut and the lock ring at a position where the lock claw abuts the clamping piece. With respect to the relative position, the engagement nut and the lock ring are simultaneously rotated in the loosening direction while maintaining the state, which is not necessarily good operability. From time to time in the liquid spraying device, the nozzle of the spray head is replaced with a nozzle having a different shape, or the orientation of the nozzle is switched. At this time, it is necessary to temporarily loosen the fastening of the spray head. In the case of 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 large number of components are mounted on one work boom 51. Among the liquid spraying apparatuses of the spray nozzle unit 1A, it is particularly advantageous to be able to easily and quickly release the nozzles from the fastening of the spray head 20A, especially for a device that frequently changes the nozzle or changes the direction of spraying. The component joint of Patent Document 1 has a structure that cannot be said to be sufficiently simplified. Therefore, the object of the present invention is to make the component joint stable with a simple structure to prevent the engagement nut or the cap nut from loosening at the end of the screwing, and at the same time, the nut or the cap can be easily engaged. A nut for loosening the nut; and a spray nozzle unit for liquid spraying, which uses the component joint to connect the spray head to the nozzle holder. [Technical means to solve the problem] In order to solve the above-mentioned problem, the present invention includes a connection nut member having a joint nut and a male thread at the end portion, and a lock ring for screwing the engagement nut to the connection partner. The component joint installed by the male thread of the component is non-rotatable and axially non-movable relative to the outer periphery of the screw-in front end side of the above-mentioned joint nut. The locking ring protrudes from the front end of the joint nut in the axial direction. And has: an outer ring; an inner flange that is provided to protrude radially inwardly at an inner diameter portion of the outer ring; and a cantilever-supported spring ring that is formed by free ends from a radially inner end of the inner flange Extending away from the engaging nut; and between the inner peripheral surface of the outer ring and the outer peripheral surface of the spring ring, there is a gap that allows the diameter to expand due to the elastic deformation of the spring ring, and the spring The ring has a mountain-shaped locking portion at a constant pitch in the circumferential direction on the inner peripheral side. The ring is formed by crossing a first inclined surface inclined in the reverse direction and a second inclined surface having a larger inclination angle than the first inclined surface, and intersecting the radial direction. And the connection counterpart member has at least one engaging protrusion on the outer periphery of the root end side of the male thread, which is more oriented than a circle of each of the locking portions engaged with the locking portion. The engaging protrusion is protruded to the outside, and the engagement protrusion includes a first cam surface that has a small inclination angle when the lock portion climbs when the engaging nut rotates in a tightening direction, and a second cam surface that When the engaging nut is rotated in the loosening direction, the inclination angle is larger than the first cam surface abutted by the lock portion. The locking ring is preferably formed of a resin such as polyacetal. The above-mentioned joining nut and nozzle holder are preferably formed of a resin such as polyacetal in the same manner. Furthermore, it is preferable that the inclination angle of the second inclined surface of the spring ring is larger than the inclination angle of the first inclined surface, and it is more preferable that the inclination angle of the first inclined surface is set to It is smaller than the inclination angle of the second cam surface. The present invention also provides a spray nozzle unit for liquid spraying, which includes: a nozzle holder connected to the counterpart, which has an internal flow path; and a nozzle, which is combined with the nozzle holder; and the structure of the nozzle includes a nozzle. The nozzle and a component joint connecting the nozzle to the nozzle holder; the component joint is a component joint provided with a joint nut and a spring ring; the nozzle is fastened to a male thread at the front end of the nozzle holder; The aforementioned engaging nut is screwed and fixed to the front end of the nozzle holder. The spray nozzle unit may be a filter in which a filter for allowing liquid sprayed from the nozzle to be assembled inside the nozzle holder. The aforementioned joint nut which can consider the component joint of the present invention can also be replaced with a bottomed cylindrical cap member (a cap nut) having a female thread. Although the component joint using the bottomed cylindrical cover member cannot be used for connecting the nozzle of the spray nozzle unit to the nozzle holder, it can be used for the purpose of airtightly closing the end of the pipeline by the cover member. In addition, a component joint provided with a joint nut can also be used, for example, in a case where the nozzle holder is connected to the first pipe joint in a liquid-tight and relatively rotatable manner by using a first pipe joint fixed to a work boom or the like. The second pipe joint of the pipe joint and the third pipe joint that is non-rotatably externally fitted to the second pipe joint are configured, and the second pipe joint is compared with the first pipe joint by using a member joint including a joint nut. The connection and connection of the nozzle to the third pipe joint. In addition, it can also be used in a case where a diaphragm valve for opening and closing a pipeline in the middle of assembly is mounted to a first pipe joint of a valve holder using a component joint including a joint nut. [Effects of the Invention] If the component joint of the present invention is made by screwing an engaging nut or a cover member for mounting a lock ring onto a male thread connected to a counterpart member and gradually tightening it, the lock portion of the spring ring will climb on the Engagement protrusions for connecting the counterpart members. Since this climbing system lock portion is in contact with the first cam surface of the engagement protrusion with a small inclination angle, the lock portion will pass over the engagement protrusion even without applying a large tightening force, thereby engaging the nut Or, the lid member can be fastened smoothly without requiring a large force. On the other hand, when the nut or cover member is subjected to vibration or the like, the second inclined surface provided in the locking portion of the lock ring is engaged with the second cam surface provided in the engaging projection connected to the counterpart member, thereby preventing the Looseness of the joint nut or cover part of the mounting lock ring. On the joint nut or cover member screwed onto the male thread of the counterpart member, there is a force applied in an attempt to rotate (reverse rotation) the loosening direction due to the effect of the thread lead. In addition, the male screw connecting the counterpart member is formed of resin, and in particular, the joint nut or the cover member is also formed of resin. The male screw and the female screw that are elastically deformed due to tightening attempt to elastically recover. Axial force is applied. The combined force of these two forces acts on the contact portion between the second cam surface of the engaging projection and the second inclined surface of the spring ring, and the second inclined surface of the locking portion is pressed against the second cam surface of the engaging projection. When the locking portion is in contact with the engaging protrusion, and the diameter expansion state of the spring ring is maintained due to elastic deformation, the elastic restoring force of the spring ring is also added to the second inclined surface. With the pressing force of the cam surface, resistance is applied to the rotation of the cam ring relative to the loosening direction of the lock ring. The stronger the tightening of the engaging nut is, the greater the frictional force and elastic restoring force of the thread fitting portion, and the larger the resistance to rotation in the loosening direction becomes. Therefore, as long as the force to overcome the resistance is not applied, the lock ring cannot rotate beyond the engaging protrusion. Since the lock nut or the cover member is installed so that the lock ring cannot be relatively rotated, the rotation of the lock ring under the degree of vibration is prevented from continuing without rotating in the loose direction. The lock ring rotates together with the engaging nut or cover member. Therefore, simply by applying a force against the rotational resistance to the engagement nut or cover member and simply rotating it in the loosening direction, the engagement of the lock portion with the engagement protrusion can be released, and the engagement screw can be simply released. Cap or cover component fastening. In addition, the above-mentioned lock ring system integrates an individual shaper with a joint nut or a cover member. This is done for the following reasons. That is, the engaging nut or cover member has a female thread screwed to a male thread. When the female screw is formed by using a mold using molten resin or the like as a material, it is necessary to rotate and pull out the female screw forming portion of the mold when the mold is released. The lock ring having a corrugated spring ring with an inner surface is separately processed and installed, so that the female thread forming portion of the mold cannot be rotated and pulled out. Thereby, a spring ring having a structure supported by a cantilever and having a corrugated inner surface can be provided. The locking ring is elastically deformed when the locking portion of the spring ring passes over the engaging protrusion. However, as long as the locking ring is separate from the engaging nut or cover member, the engaging nut or cover member is elastically deformed even if the locking ring is elastically deformed. No elastic deformation occurs. Therefore, there is no case where the screwing state of the engaging nut or the cover member with respect to the male thread of the counterpart member is unstable. The spring ring of the lock ring allows a diameter expansion due to elastic deformation due to a gap provided on the outer periphery thereof, whereby the lock portion of the spring ring can pass over the engagement protrusion. In addition, by setting the inclination angle of the first cam surface of the engaging protrusion to be smaller than the inclination angle of the second cam surface, the locking portion of the spring ring can be rotated when the engaging nut or cover member is rotated in the tightening direction. It smoothly passes over the engaging protrusions and can be tightened easily without any obstacle. In addition, a locking ring formed of a resin can be provided with a spring ring that is easily deformed elastically by taking advantage of the characteristics of the resin. In addition, setting the inclination angle of the first inclined surface to a fraction of the inclination angle of the first cam surface makes the contact of the lock portion with the first cam surface close to the line contact, and reduces the engagement nut or The frictional resistance when the cover member rotates in the tightening direction allows the tightening operation to be performed with less force.

Hereinafter, an embodiment of a component joint of the present invention will be described based on FIGS. 1 to 10 of the drawings. 1 to 4 show an example of a spray nozzle unit according to the present invention. The spray nozzle unit 1 shown in the figure is configured by combining a nozzle holder 10 and a spray head 20. The nozzle holder 10 is fixed to the outer periphery of the liquid supply pipe 40 such as a work boom. The nozzle holder 10 shown in the figure is a holder which is divided into two and two members (the main body portion 10a and the pressing member 10b) are connected by a screw shaft (not shown) or the like. The liquid introduction port 11 a provided in the main body portion 10 a 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 communicates with the internal flow path of the liquid supply pipe 40. The periphery of the liquid introduction port 11a is hermetically sealed by an O-ring 15. The nozzle head 20 is attached to the body portion 10 a of the nozzle holder 10. The structure of the spray head 20 includes a nozzle 21 and a component joint 22 that is fixed to and detachably connected to the nozzle holder 10 from the nozzle 21. The nozzle 21 is provided by assembling a nozzle plate 21b having a nozzle to a resin ring 21a. The component joint 22 is a component joint of the present invention. The component joint 22 includes: an engaging nut 23 that is screwed to the male thread 14 of the main body portion 10a; and a locking ring 24 that is non-rotatable relative to the outer periphery of the screw-in front end side of the engaging nut 23 and axially opposite. Mounted movably; and an engaging protrusion 25 that engages the lock ring 24. A part of the locking ring 24 protrudes axially from the front end of the engaging nut 23. The locking ring 24 includes: an outer ring 24a; an inner flange 24b (refer to FIG. 1), which is provided to protrude radially inwardly in the longitudinal direction of the inner diameter side of the outer ring; and a spring ring 24c supported by a cantilever, It extends from the radially inner end of the inner flange with a free end in a direction away from the engaging 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 to be expanded due to the elastic deformation of the spring ring 24c. A plurality of fixing wedges 24e (see FIG. 3) provided at a constant pitch in the circumferential direction on the inner peripheral surface of the outer ring 24a are inserted into the locking ring 24 into the fixing wedge grooves 23a provided in the outer engagement portion of the locking ring 23 (Refer to FIG. 2) The relative rotation with the engagement nut 23 is prevented. Further, as shown in FIG. 1, a radial bulging portion 24 f (see FIG. 3) provided on the inner peripheral surface of the outer ring 24 a is semicircular, and is fitted into the lock ring provided on the engagement nut 23 to fit into the outer ring. The engaging groove 23b (refer to FIG. 2) extending discontinuously in the circumferential direction is prevented from moving relative to the axial direction of the engaging nut 23. The spring ring 24c is, as shown in FIG. 4, a locking portion 24g having a mountain shape at a constant pitch in the circumferential direction on the inner peripheral side. The first inclined surface S1 inclined from the reverse direction and the inclination angle larger than the first inclined surface S1 are larger. The second inclined surface S2 intersects at an obtuse angle and protrudes radially inward. The engaging protrusion 25 is provided on the outer periphery of the root of the male thread 14. The top of the engaging protrusion 25 is located radially outward from a circle inscribed in each of the locking portions 24g, and has a first cam that the locking portion 24g climbs when the engaging nut 23 rotates in a tightening direction. The surface 25a is in contact with the second cam surface 25b of the lock portion 24g when the engaging nut 23 is rotated in the release direction. The first cam surface 25a is inclined in the opposite direction to the second cam surface 25b, and the inclination angle θ1 shown in FIG. 5A of the first cam surface 25a is smaller than the inclination angle θ2 of the second cam surface 25b. The exemplified component joint 22 is set with an inclination angle θ1 of approximately 20 °, an inclination angle θ2 of approximately 45 °, and an inclination angle θ3 of the second inclined surface S2 of the spring ring 24c is approximately 25 °. Of course, these tilt angles are not limited to the illustrated angles. The inclination angles θ1 and θ2 referred to herein are the inclination angles of the cam surfaces with respect to a line perpendicular to the straight line connecting the center of the male thread 14 and the top of the engagement protrusion 25, and the inclination angle θ3 is relative to the second inclined surface S2. The inclination angle of a line perpendicular to the straight line connecting the bottom of the groove between the center of the spring ring 24c and the adjacent lock portion 24g. In the illustrated spray nozzle unit, the four engaging protrusions 25 are provided at a constant pitch in the circumferential direction. However, as long as there is at least one engaging protrusion 25, the setting purpose can be achieved. The engaging protrusions 25 are preferably provided at a constant pitch in the circumferential direction, and the force is evenly applied to the locking portion 24g. However, the setting pitches of the engaging protrusions 25 are not particularly set to be equal. The need for spacing. Each 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. As for the material, a high-strength resin is preferred over metal, but it is not limited to polyacetal. If the member joint 22 is screwed with the male nut 14 to the male thread 14 and gradually tightened, the locking portion 24g of the spring ring 24c climbs to the engaging protrusion 25 provided at the root of the male thread 14 near the end of the tightening. Of 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 due to the component force generated by the contact portion between the first cam surface 25a and the lock portion 24g, thereby expanding the diameter of the lock portion 24g. The engaging protrusion 25 is smoothly passed. On the other hand, if the engaging nut 23 is subjected to vibration in a state where it is located at the end of tightening, the engaging 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 (see FIG. 5B) having a large inclination angle of the engaging projection 25, thereby preventing the engagement nut 23 from loosening. . As described above, when the locking portion 24g is in contact with the engaging protrusion 25, and the diameter expansion state of the spring ring 24c is maintained due to elastic deformation, the elastic restoring force of the spring ring 24c is also added to the second inclined surface. The pressing force of S2 on the second cam surface 25b. In addition, the stronger the tightening of the engaging nut 23 is, the larger the frictional force and elastic restoring force of the screw fitting portion are. Under these effects, the resistance to the loosening direction rotation of the lock ring 24 becomes large, and the loosening of the engagement nut 23 is prevented from being stabilized. Fig. 6 shows another example of the spray nozzle unit of the present invention. In the spray nozzle unit 1 shown in FIG. 6, a nozzle holder 10 is provided which provides a switching function to the direction of the nozzle head 20. The structure of the nozzle holder 10 includes a first pipe joint 11 including a bifurcated member fixed to the outer periphery of a liquid supply pipe 40 such as a work boom, and a second pipe joint 12 connected to the first pipe joint 12. A pipe joint; and a 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: the first fitting 12a, which is externally fitted with an O-ring 15 and is liquid-tightly inserted into the front end of the first pipe joint 11 and is divided into two; 2 accessories (bamboo shoot external thread sockets) 12b, which are liquid-tightly mounted on the outer periphery of the small-diameter cylindrical portion on the front end side of the first accessory 12a. The third pipe joint 13 shown in the figure is an L-shaped joint whose front end side 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 is pressed. It is connected to the third pipe joint 13 so as to be relatively non-rotatable. Each of the first pipe joint 11, the second pipe joint 12, and the third pipe joint 13 is formed of a high-strength resin such as polyacetal, and the pressing part of the second fitting 12b of the third pipe joint 13 is even Liquid-tight sealing is also possible without providing a 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 inside of the front end side of the third pipe joint 13 is provided in the longitudinal direction of the small-diameter cylindrical portion 12c. The communication hole 12d in the middle is connected to a passage inside the small-diameter cylindrical portion 12c. A total of three communication holes 12d are provided at a specific pitch (for example, 45 ° pitch) in the circumferential direction. The nozzle head 20 is connected to the male thread 14 at the front end of the third pipe joint 13 by the aforementioned component joint 22. 16 of FIG. 6 is a filter provided in the third pipe joint 13 as necessary. The connection of the second pipe joint 12 to the first pipe joint 11 of the spray nozzle unit 1 in FIG. 6 is also performed using the aforementioned component joint 22. If the joint nut 23 of the component joint 22 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 one-dot chain line in FIG. 7, the connection position of the communication hole 12 d with respect to the internal flow path of the third pipe joint 13 and the orientation of the shower head 20 are switched. Then, the nut 23 is fastened again to fix the orientation of the shower head 20. FIG. 8 shows a diaphragm valve 30 that is installed in the middle of the pipeline for the purpose of preventing the liquid remaining in the liquid supply pipe 40 from dripping from the nozzle of the nozzle 20 when the liquid spraying is stopped. An example of a spray nozzle unit 1. The diaphragm valve 30 is a valve body 32 having a rubber-shaped valve film 32a assembled in a cap-shaped valve body 31 and a return spring 33 that urges the valve body toward the valve closing direction. When liquid is supplied, the liquid supply pipe 40 When the internal pressure becomes high, the diaphragm valve 30 is opened and liquid is ejected from the shower head 20. When the supply of liquid is stopped and the internal pressure of the liquid supply pipe 40 is decreased, the diaphragm valve 30 is closed to prevent liquid from the shower head. 20 drops. The diaphragm valve 30 is attached to the first pipe joint 11A by using the aforementioned member joint 22. The spray nozzle unit 1 of FIG. 8 is different from the spray nozzle unit 1 of FIG. 6 in that a diaphragm valve 30 is added to the first pipe joint 11A having a structure different from that of FIG. 6. Since the other components are the same as those of the spray nozzle unit 1 shown in FIG. 6, the description is omitted. FIG. 9 shows a component joint 22 in which an engagement nut is replaced with a bottomed cylindrical cover member (cap nut) 26 having a female screw 26a. The component joint 22 using the cover member 26 can be used for the purpose of airtightly closing the end of a pipeline with the cover member and the like. 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 a 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 disassembled, and the bottom end of the disassembled pipe is opened with a bottomed cylindrical cover. When parts are clogged and used. In such a case, the component joint of the present invention can also perform effectively when the cover member is stably fixed.

1‧‧‧ spray nozzle unit

1A‧‧‧ spray nozzle unit

10‧‧‧ Nozzle holder

10A‧‧‧Nozzle holder

10a‧‧‧Body

10b‧‧‧Pressing member

11‧‧‧The first pipe joint

11a‧‧‧Liquid inlet

11A‧‧‧The first pipe joint

12‧‧‧ 2nd pipe joint

12a‧‧‧The first accessory

12b‧‧‧The second accessory (bamboo shoot external thread socket)

12c‧‧‧Small diameter cylindrical part

12d‧‧‧Connecting hole

13‧‧‧3rd pipe joint

14‧‧‧ male thread

15‧‧‧O-ring

16‧‧‧Filter

17‧‧‧Supervisor

18‧‧‧ branch

20‧‧‧ Nozzle

20A‧‧‧Nozzle

21‧‧‧Nozzle

21a‧‧‧resin ring

21b‧‧‧ spray plate

22‧‧‧component joint

23‧‧‧Joint nut

23a‧‧‧Fixed wedge groove

23b‧‧‧Slot

24‧‧‧ lock ring

24a‧‧‧outer ring

24b‧‧‧Inner flange

24c‧‧‧Spring ring

24d‧‧‧Gap

24e‧‧‧Fixed wedge

24f‧‧‧Radial bulge

24g‧‧‧Lock

25‧‧‧ engagement 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

33‧‧‧Return spring

40‧‧‧Liquid supply pipe

41‧‧‧through hole

50‧‧‧Pallet truck

51‧‧‧Working boom

IV-IV‧‧‧line

S1‧‧‧The first slope

S2‧‧‧The second slope

θ1‧‧‧Inclination angle of the first cam surface

θ2‧‧‧Inclination angle of the second cam surface

θ3‧‧‧ inclination angle of the second inclined surface of the locking portion

FIG. 1 is a 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 the spray nozzle unit of FIG. 1. FIG. FIG. 3 is a perspective view of a locking ring provided on the component joint of FIG. 1 as viewed from the back side. FIG. 4 is an enlarged sectional view taken along the line IV-IV in FIG. 1. 5A is a cross-sectional view showing a relationship between a locking portion of a locking ring and an engagement protrusion when the engagement nut is rotated in a tightening direction. FIG. 5B is a cross-sectional view showing the relationship between the locking portion of the lock ring and the engagement protrusion when the engagement nut is rotated in the loosening direction. Fig. 6 is a sectional view showing still 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. Fig. 8 is a sectional view of another example of the spray nozzle unit of the present invention. Fig. 9 is a sectional view showing still another example of a component joint of the present invention. Fig. 10 is a side view partially cutting off 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.

Claims (5)

A component joint comprising: a joint nut (23); and a connection counterpart member having a male thread (14) at an end portion; the joint nut (23) is screwed onto the male thread of the connection counterpart member (14) The component joint (22) to be installed has a lock ring (24) which is not rotatable with respect to the outer periphery of the screw-in front end side of the joint nut (23), and is axially non-rotatable. Installed relatively moving, the locking ring protrudes partly from the front end of the aforementioned engagement nut (23) in the axial direction, and has: an outer ring (24a); an inner flange (24b), which is in the inner diameter portion of the outer ring Projected radially inwardly; and a cantilever-supported spring ring (24c) extending from the radially inner end of the inner flange with a free end in a direction away from the engaging nut; and in the aforementioned outer ring (24a) There is a clearance (24d) between the inner peripheral surface of the spring ring (24c) and the outer peripheral surface of the spring ring (24c), which allows the diameter to increase due to the elastic deformation of the spring ring (24c), and the spring ring (24c) is The inner peripheral side has a mountain-shaped locking portion (24g) at a constant pitch in the circumferential direction. The locking portion (S1) slopes in the reverse direction from the first inclined surface (S1) inclined in the reverse direction. The second inclined surface (S2) with a large inclination angle crosses at an obtuse angle and protrudes radially inward, and the connection counterpart member has at least one engagement on the outer periphery of the root end side of the male thread (14). The protrusion (25) protrudes more radially outward than a circle in which each of the locking portions (24g) engages with the locking portion, and the engaging protrusion (25) includes: a first cam surface ( 25a), when the engaging nut (23) is rotated in the tightening direction, the inclination angle climbed by the locking portion is small; and the second cam surface (25b), which faces the engaging nut (23) toward When rotating in the loosening direction, the inclination angle is larger than the first cam surface abutted by the lock portion (24g). The component joint according to claim 1, wherein the plurality of engaging protrusions (25) are provided at a constant pitch in the circumferential direction. A component joint includes a bottomed cylindrical cover member (26) having a female thread (26a), and a connection counterpart member having, at an end portion, a male thread (14) for screwing the aforementioned female thread (26a) into a thread. ); It is a component joint (22) which is installed by screwing the aforementioned cover member (26) to the male thread (14); it has: a locking ring (24), which is opposite to the aforementioned cover member (26) The locking ring is mounted on the front end side so as to be non-rotatable and axially non-relatively movable. The locking ring projects partly from the front end of the aforementioned engaging nut (23) toward the axial direction, and has: an outer ring (24a); an inward convex A rim (24b) provided on the inner diameter portion of the outer ring to protrude radially inward; and a cantilever-supported spring ring (24c) engaged from the radially inner end of the inner flange away from the free end toward away The direction of the nut extends out; and between the inner peripheral surface of the outer ring (24a) and the outer peripheral surface of the spring ring (24c), there is an enlarged diameter that is allowed due to the elastic deformation of the spring ring (24c) Clearance (24d), and 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, which is tilted in the reverse direction The first inclined surface (S1) and the second inclined surface (S2) having a larger inclination angle than the first inclined surface intersect at an obtuse angle, and protrude radially inward, and the connecting counterpart member is in the male thread (14). The root portion has at least one engaging protrusion (25) on its outer periphery, which projects more radially outward than a circle of each of the locking portions (24g) that is inscribed on the locking portion, and the aforementioned The engaging protrusion (25) includes a first cam surface (25a), and when the engaging nut (23) rotates in a tightening direction, an inclination angle at which the locking portion climbs is small; and a second cam surface ( 25b), when the engaging nut (23) is rotated in the loosening direction, the inclination angle is larger than the first cam surface abutted by the locking portion (24g). The component joint according to claim 3, wherein the plurality of engaging protrusions (25) are provided at a constant pitch in the circumferential direction. A spray nozzle unit for liquid spraying includes: a nozzle holder (10) connected to the opposite side, which has an internal flow path; and a nozzle (20), which is combined with the nozzle holder; and the constitution of the foregoing nozzle (20) Including: a nozzle (21) having a nozzle and a component joint (22) connecting the nozzle to the nozzle holder (10); the component joint (22) is a joint nut (23) and a spring ring (24c) ) As in claim 1 or 2; and the aforementioned nozzle (21) is fastened to the aforementioned engaging nut (23) screwed with the male thread (14) at the front end of the aforementioned nozzle holder (10), and It is fixed to the front end of the nozzle holder (10).