CN221192843U - Nozzle assembly and paver - Google Patents

Abstract

The utility model relates to the technical field of asphalt paving, in particular to a nozzle assembly and a paver, which comprise a piston rod, a nozzle valve block and a nozzle, wherein the periphery of the free end of the piston rod is wrapped with a sheath, the nozzle valve block comprises a first mounting hole, a channel hole and a second mounting hole which are sequentially communicated, the bottom of the first mounting hole is communicated with a conical hole with the diameter gradually decreasing from top to bottom, a first arc surface is connected between the first conical surface of the conical hole and the side surface of the channel hole, the sheath is arranged in the first mounting hole, the peripheral surface of the sheath is in contact seal with the first arc surface, the peripheral surface of the sheath is a second conical surface which can be attached to the first conical surface of the conical hole, and the nozzle is arranged in the second mounting hole. The wear surface of the utility model plays a role of automatic compensation, and when the sheath is worn, the sheath is always in contact with the surface of the nozzle valve block, so that the tightness between the sheath and the nozzle valve block is ensured, the service life of the sheath is prolonged, and the working stability of the paver is improved.

Description

Nozzle assembly and paver

Technical Field

The utility model relates to the technical field of asphalt paving, in particular to a nozzle assembly and a paver.

Background

At present, the common asphalt pavement paving construction mostly adopts the following processes that before asphalt mixture paving, adhesive layer emulsified asphalt is sprayed, and then broken stone is sprayed; the asphalt surface layer can be paved after the emulsified asphalt is demulsified, and the process has long construction period and is restricted by weather; after the emulsified asphalt is sprayed, the crushed stone and the emulsified asphalt are rolled, damaged and bonded during paving, so that the newly paved surface layer asphalt mixture and the base layer lose bonding performance. Thus, a paver integrating the emulsified asphalt spreading function of a special spreader with the asphalt mixture spreading function of a common paver begins to appear in the industry, asphalt liquid of the paver is sprayed to the ground in a pulse mode at the same frequency, and high-frequency pulse spraying brings high requirements to the sealing performance of a nozzle assembly.

If a sealing mode of metal sealing is adopted, namely, the convex conical surface of the cylinder piston rod and the concave conical surface of the spray head form conical surface sealing to control the opening and closing of the spray head, pulse spraying with higher frequency and longer service life cannot be realized. Chinese patent CN 109235200a discloses a venturi effect hot asphalt nozzle assembly and a synchronous spraying hot asphalt spreader, a bellows is arranged in a nozzle valve block, the free end of a piston rod can extend into the bellows, and the bellows is abutted on a nozzle, although the seal between the bellows and the nozzle is adopted to replace a metal sealing mode, the seal between a sheath at the bottom of the piston rod and the nozzle valve block in the scheme is always a linear contact seal along with the occurrence of abrasion, the seal is unreliable, and in the use process, the contact part of the sheath at the bottom of the piston rod and the nozzle valve block is gradually worn to form a wear ring, so that the sealing effect is lost.

Disclosure of utility model

The utility model aims to overcome the defects in the prior art, and provides a nozzle assembly and a paver, which can improve the sealing performance of the bottom of a piston rod sheath and a nozzle valve block and prolong the service life of the piston rod sheath.

In order to solve the technical problems, the utility model adopts the following technical scheme:

The utility model provides a nozzle assembly, including piston rod, nozzle valve piece and nozzle, the periphery parcel of piston rod free end has the sheath, the nozzle valve piece is including the first mounting hole, the passage way hole and the second mounting hole that communicate in proper order and set up, first mounting hole lateral part intercommunication has the inflow hole, first mounting hole bottom intercommunication has the diameter taper hole that reduces gradually from top to bottom, be connected with first arc surface between the side of the first conical surface of taper hole and passage way hole, the sheath is located in the first mounting hole the outer peripheral face of sheath with first arc surface contact seal, just the outer peripheral face of sheath for can with the second conical surface that the first conical surface of taper hole laminated, the nozzle is installed in the second mounting hole.

The nozzle assembly is characterized in that at the beginning of working, the second conical surface at the periphery of the sheath is in contact sealing with the first circular arc surface, and the contact at the moment is line contact to form a contact circle; the sheath is worn gradually along with the lapse of the service time, the contact circle continuously extends upwards along the second conical surface of the sheath, and when the sheath is worn to a certain degree, the first conical surface and the second conical surface are overlapped to form a wearing surface. When the sheath continues to work, the second conical surface of the sheath continues to wear, but the second conical surface of the sheath coincides with the first conical surface of the conical hole; namely, the abrasion surface plays a role in automatic compensation, and when the sheath is abraded, the sheath is always kept in contact with the surface of the nozzle valve block, so that the tightness between the sheath and the nozzle valve block is ensured, and the service life of the sheath is prolonged.

Further, the radius of the inflow hole is larger than the distance between the central axis of the inflow hole and the bottom surface of the first mounting hole. The bottom of the inflow hole is designed to sink, so that the impact on the sheath when liquid flows in can be avoided, and the service life of the sheath is prolonged.

Further, the piston rod further comprises a corrugated sheath, and the corrugated sheath is sleeved on the periphery of the piston rod. The ripple sheath is multilayer annular structure, and the expansion property is better, and inside cavity cover is in the piston rod periphery. Preferably, the corrugated sheath and the sheath are of an integrated structure, so that the corrugated sheath and the sheath can be conveniently replaced when the sealing performance is lost.

Further, the sheath comprises a connecting portion and a conical portion, the connecting portion is arranged between the corrugated sheath and the conical portion, and the second conical surface is arranged on the periphery of the conical portion. The structural design of the sheath not only can enable the sheath to be connected with the piston rod, but also can enable the corrugated sheath to have a central centering effect when being matched with the nozzle valve block so as to ensure a good sealing effect. Preferably, the connection is provided with means for mounting with the piston rod, for example with a threaded blind hole, enabling a sheath to be wrapped around the free end of the piston rod.

Further, the second mounting hole is a cylindrical hole, an inner thread is arranged on the inner wall of the second mounting hole, an external thread is arranged at the end part of the nozzle, and the nozzle is in threaded connection with the second mounting hole through the inner thread and the external thread. The nozzle and the nozzle valve block are connected in a threaded connection mode, so that the operation is simple and convenient, and the connection is stable.

Further, the internal thread and the external thread are both pipe threads. The nozzle is connected with the nozzle valve block through pipe threads, and the connection stability between the nozzle and the nozzle valve block can be ensured as the nozzle is screwed more tightly.

Further, a first outlet and a second outlet which are symmetrical with respect to the axis of the nozzle are formed in the bottom of the nozzle, the first outlet and the second outlet are separated by a separation part, a first guide plane is arranged on one side of the first outlet, a second guide plane is arranged on one side of the second outlet, and the first guide plane and the second guide plane are inclined towards the axis direction of the nozzle from top to bottom. The liquid sprayed by the first outlet and the second outlet is in a fan shape, and the fan sprayed by the first outlet and the fan sprayed by the second outlet are combined into one by the arrangement of the first guide plane and the second guide plane.

Further, a second arc surface is arranged between the first guide plane and the separation part, and a third arc surface is arranged between the second guide plane and the separation part, so that the first guide plane, the second guide plane and the separation part are connected smoothly.

Further, a clearance groove is formed between the passage hole and the second mounting hole. The arrangement of the tool retracting groove can facilitate the processing of the passage hole and the second mounting hole.

The utility model also provides a paver, which comprises a spray rod and the nozzle assembly, wherein the spray rod is communicated with the inflow hole.

The paver has better working stability due to the better sealing performance between the sheath and the nozzle valve block and longer service life of the sheath.

Compared with the prior art, the utility model has the beneficial effects that:

According to the nozzle assembly and the paver, the abrasion surface plays a role in automatic compensation, and when the sheath is abraded, the sheath is always kept in surface contact with the nozzle valve block, so that the tightness between the sheath and the nozzle valve block is ensured, the service life of the sheath is prolonged, and the working stability of the paver is improved.

Drawings

FIG. 1 is a schematic structural view of a nozzle assembly;

FIG. 2 is a schematic structural view of a nozzle valve block of the nozzle assembly;

FIG. 3 is a schematic view showing a state of contact sealing between the first conical surface and the second conical surface after the sheath is worn;

FIG. 4 is a schematic structural view of a nozzle of the nozzle assembly;

In the accompanying drawings: 1. a piston rod; 2. a nozzle valve block; 21. a first mounting hole; 22. a passage hole; 23. a second mounting hole; 24. an inflow hole; 25. a tapered bore; 26. a first conical surface; 27. a first arc surface; 28. a tool retracting groove; 3. a nozzle; 31. a first outlet; 32. a second outlet; 33. a first guide plane; 34. a second guide plane; 35. a partition portion; 36. a second arc surface; 37. a third arc surface; 4. a sheath; 41. a second conical surface; 42. a connection part; 43. a cone portion; 5. an electromagnetic valve; 6. a corrugated sheath; 7. a spray bar.

Detailed Description

The utility model is further described below in connection with the following detailed description. Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the utility model, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numbers in the drawings of embodiments of the utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present utility model and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.

Example 1

As shown in fig. 1 to 3, a first embodiment of a nozzle assembly according to the present utility model includes a piston rod 1, a nozzle valve block 2 and a nozzle 3, wherein a sheath 4 is wrapped around the outer periphery of the free end of the piston rod 1, the nozzle valve block 2 includes a first mounting hole 21, a channel hole 22 and a second mounting hole 23 which are sequentially communicated, an inflow hole 24 is communicated with the side portion of the first mounting hole 21, a tapered hole 25 with a gradually decreasing diameter from top to bottom is communicated with the bottom of the first mounting hole 21, a first circular arc surface 27 is connected between a first tapered surface 26 of the tapered hole 25 and the side surface of the channel hole 22, the sheath 4 is disposed in the first mounting hole 21, the outer peripheral surface of the sheath 4 is in contact seal with the first circular arc surface 27, and the outer peripheral surface of the sheath 4 is a second tapered surface 41 which can be attached to the first tapered surface 26 of the tapered hole 25, and the nozzle 3 is mounted on the second mounting hole 23. The passage hole 22 is located between the first mounting hole 21 and the second mounting hole 23, and is located in the middle of the nozzle valve block 2, and has a smaller aperture than the first mounting hole 21 and the second mounting hole 23, and in order to facilitate the processing of the passage hole 22 in the nozzle valve block 2, a relief groove 28 is formed between the passage hole 22 and the second mounting hole 23, as shown in fig. 2.

The piston rod 1 of the present embodiment is a piston rod 1 of a solenoid valve 5. The piston electromagnetic valve 5 is a switch for driving a valve by electromagnetic force generated by an electromagnetic coil, and the piston rod 1 of the electromagnetic valve 5 can stretch and retract by the electromagnetic force generated by the electromagnetic coil. Liquid enters the first mounting hole 21 of the nozzle valve block 2 from the inflow hole 24, when the piston rod 1 is in a retracted state, the sheath 4 is retracted together with the piston rod 1, and the liquid enters the nozzle 3 through the passage hole 22 and is sprayed to the ground; when the piston rod 1 is in the extending state, the sheath 4 extends along with the piston rod 1, the second conical surface 41 of the sheath 4 is propped against the surface of the first arc surface 27, and the liquid stays in the first mounting hole 21 of the nozzle valve block 2; when the piston rod 1 is reciprocally extended and retracted in a pulsed manner, the liquid is sprayed to the ground in a pulsed manner at the same frequency. In this embodiment, the liquid may be an asphalt liquid, however, the liquid of the present utility model is not limited to an asphalt liquid, and the nozzle assembly of the present utility model is not limited to spraying asphalt.

At the beginning of the operation, the second conical surface 41 at the periphery of the sheath 4 contacts and seals with the first circular arc surface 27, and the contact at the moment is line contact to form a contact circle, as shown in fig. 1; over time, the sheath 4 wears, and this contact circle continues to develop upward along the second taper 41 of the sheath 4, and when the sheath 4 wears to some extent, the first taper 26 and the second taper 41 overlap to form a wear surface. As the sheath 4 continues to operate, the second tapered surface 41 of the sheath 4 continues to wear, but the second tapered surface 41 of the sheath 4 coincides with the first tapered surface 26 of the tapered bore 25, as shown in fig. 3; namely, the wear surface of the utility model plays a role of automatic compensation, and when the sheath 4 is worn, the surface contact of the sheath 4 and the nozzle valve block 2 is always kept, so that the tightness between the sheath 4 and the nozzle valve block 2 is ensured, and the service life of the sheath 4 is prolonged.

In which wear always occurs between the jacket 4 and the nozzle valve block 2 during operation of the piston rod 1, is a dynamic process. It should be noted that: if the sheath 4 and the nozzle valve block 2 only have the line contact between the first circular arc surface 27 and the second conical surface 41, although a certain line contact sealing effect can be achieved at the beginning of working, the sealing is unreliable, and in the use process, the contact part of the sheath 4 at the bottom of the piston rod 1 and the nozzle valve block 2 will wear early to form a wear ring (or wear ring), so that the sealing effect is lost; if the sheath 4 and the nozzle valve block 2 only have surface contact between the first conical surface 26 and the second conical surface 41, the first conical surface 26 and the second conical surface 41 cannot be jointed to form surface contact seal before running-in or abrasion occurs, and only after a period of operation, the first conical surface 26 and the second conical surface 41 can be mutually worn-in to realize surface contact seal, so that an operation period with unreliable sealing performance exists in the surface contact mode. Only if the first arc surface 27 and the first conical surface 26 are simultaneously arranged, the sheath 4 can seal the channel hole 22 before abrasion occurs, and the first conical surface 26 and the second conical surface 41 always keep fit and overlap when abrasion occurs or after abrasion occurs, so that the sealing performance in working is ensured, and the service life of the sheath 4 is prolonged.

In this embodiment, the inflow hole 24 provides an inlet for inflow of liquid, the inflow hole 24 communicates with the first mounting hole 21, the first mounting hole 21 communicates with the passage hole 22, and the inflow hole 24, the first mounting hole 21, and the passage hole 22 form a tee. In this embodiment, in order to reduce the impact on the sheath 4 when the liquid flows in and prolong the service life of the sheath 4, a sinking design is formed at the bottom of the inflow hole 24, specifically, the radius of the inflow hole 24 is designed to be larger than the distance between the central axis of the inflow hole 24 and the bottom surface of the first mounting hole 21, so that the bottom of the inflow hole 24 is lower than the bottom of the first mounting hole 21, and thus, the part of the bottom of the inflow hole 24 lower than the bottom of the first mounting hole 21 plays a role in buffering and stabilizing the flowing-in liquid, thereby reducing the impact of the liquid flowing in on the sheath 4. The radius of the inflow hole 24 should not be excessively large. In this embodiment, the aperture of the first mounting hole 21 is larger than the aperture of the second mounting hole 23 and the aperture of the channel hole 22, the aperture of the second mounting hole 23 is closer to the aperture of the first mounting hole 21, and if the radius of the inflow hole 23 is larger than the radius of the inflow hole 23, the bottom of the inflow hole 23 is communicated with the second mounting hole 23, so that the sealing failure is caused.

In this embodiment, the first mounting hole 21 is a cylindrical hole and is disposed coaxially with the sheath 4 and the piston rod 1. The nozzle assembly of the present embodiment further comprises a bellows shield 6, the bellows shield 6 being sleeved on the outer circumference of the piston rod 1. The corrugated sheath 6 is of a multi-layer annular structure, the expansion performance is good, the inner hollow sleeve is sleeved on the periphery of the piston rod 1, and the corrugated sheath can provide assistance for the abutting connection between the sheath 4 and the nozzle valve block 2 during shrinkage, so that the sealing performance between the sheath 4 and the nozzle valve block 2 is better. The corrugated sheath 6 is located in the first mounting hole 21, and in order to avoid contact friction between the outer wall of the corrugated sheath 6 and the wall of the first mounting hole 21, the diameter of the corrugated sheath 6 in this embodiment should be smaller than the diameter of the first mounting hole 21, especially the diameter of the corrugated sheath 6 after being compressed by extrusion should be smaller than the diameter of the first mounting hole 21. The corrugated sheath 6 and the sheath 4 need to have better elasticity and sealing performance, so the corrugated sheath 6 and the sheath 4 are often formed by adopting polymer materials, the nozzle valve block 2 is often in a metal structure, the polymer materials are more easily worn, deformed and damaged compared with metal, and the corrugated sheath 6 is also easily damaged by fatigue after repeated extrusion deformation. Therefore, in this embodiment, the corrugated sheath 6 and the sheath 4 are integrally formed, which is convenient for processing and forming, and is convenient for replacement after damage. In addition, in this embodiment, the sheath 4 includes the connecting portion 42 and the cone portion 43, the connecting portion 42 is located between the corrugated sheath 6 and the cone portion 43, the connecting portion 42 is provided with a threaded blind hole for being mounted with the piston rod 1, and the second cone surface 41 is located at the periphery of the cone portion 43, so designed, not only can the sheath 4 be connected with the piston rod 1, but also the corrugated sheath 6 can have a central centering effect when being matched with the nozzle valve block 2, so as to ensure a better sealing effect.

In this embodiment, the second mounting hole 23 is a cylindrical hole, the inner wall of the second mounting hole 23 is provided with an internal thread, the end of the nozzle 3 is provided with an external thread, the nozzle 3 and the second mounting hole 23 are in threaded connection with the external thread through the internal thread, and the nozzle 3 and the nozzle valve block 2 are connected in a threaded connection manner, so that the operation is simple and convenient, and the connection is stable. Because the nozzle 3 is impacted by the reaction force of a liquid when spraying the liquid to the ground, in order to ensure the connection stability and the working stability of the nozzle 3, the internal thread and the external thread are all pipe threads in the embodiment, so that the nozzle 3 and the second mounting hole 23 are screwed more tightly when being mounted, and the loosening in the working process can be effectively avoided; of course, the specific connection between the nozzle 3 and the nozzle valve block 2 is not limited to the present utility model, and other connection forms that can ensure stable operation of the nozzle 3 may be applied to the present utility model.

Example two

In this embodiment, as shown in fig. 4, a first outlet 31 and a second outlet 32 symmetrical with respect to the axis of the nozzle 3 are provided at the bottom of the nozzle 3, the first outlet 31 and the second outlet 32 are separated by a partition 35, a first guiding plane 33 is provided at one side of the first outlet 31, a second guiding plane 34 is provided at one side of the second outlet 32, and the first guiding plane 32 and the second guiding plane 33 are inclined from top to bottom in the direction of the axis of the nozzle 3, so that an acute angle is formed between the plane of the first guiding plane 32 and the plane of the second guiding plane 33. The inside of the nozzle 3 is of a hollow structure, the first outlet 31 and the second outlet 32 are actually communicated, liquid is respectively sprayed out from the first outlet 31 and the second outlet 32, and then the liquid is collected under the action of the first guide plane 32 and the second guide plane 33, so that uniform liquid can be sprayed. Through the design of the shape, pressure and other parameters of the first outlet 31 and the second outlet 32, the liquid at the first outlet 31 and the second outlet 32 are sprayed out in a fan shape, and the two fan shapes are combined into a whole under the action of the first guide plane 33 and the second guide plane 34. The partition portion 35 is formed during the process of processing the first outlet 31 and the second outlet 32, the left side surface and the right side surface of the partition portion 35 are vertical planes so as to reduce the processing difficulty, and the first guide plane 32 and the second guide plane 33 are respectively opposite to the left side surface and the right side surface of the partition portion 35, so that the spraying direction and the spraying shape of the liquid at the first outlet 31 and the second outlet 32 are limited together. In order to smoothly transition the first guide plane 32, the second guide plane 33 and the left and right sides of the partition 35, a second arc surface is provided between the first guide plane 32 and the partition 35, and a third arc surface 34 is provided between the second guide plane 33 and the partition 35 during processing.

Example III

This embodiment is an embodiment of a paver, including a spray bar 7 and a nozzle assembly of either the first or second embodiments, the spray bar 7 being disposed in communication with an inflow opening 24. In this embodiment, the asphalt liquid flows from the spray bar 7 into the nozzle valve block 2, and the asphalt liquid in the spray bar 7 should be hot asphalt liquid. To avoid premature solidification of the hot asphalt liquid, the present embodiment may provide a heating pipe in the spray bar 7 to maintain the temperature of the hot asphalt liquid.

When the piston rod 1 is reciprocally extended and retracted in a pulse mode in the implementation of the embodiment, asphalt liquid enters the first mounting hole 21 from the spraying rod 7 and is sprayed to the ground through the channel hole 22 and the nozzle 3 in a pulse mode at the same frequency. At the beginning of working, the second conical surface 41 at the periphery of the sheath 4 is in contact seal with the first circular arc surface 27, and the contact at the moment is line contact to form a contact circle; as the sheath 4 reciprocates and expands and collides with the nozzle valve block 2 for a plurality of times over the course of use, the sheath 4 gradually wears, the contact circle continuously develops upward along the second conical surface 41 of the sheath 4, and when the sheath 4 wears to a certain extent, the first conical surface 26 and the second conical surface 41 overlap to become wear surfaces. As the sheath 4 continues to operate, the second tapered surface 41 of the sheath 4 continues to wear, but the second tapered surface 41 of the sheath 4 coincides with the first tapered surface 26 of the tapered bore 25; namely, the wear surface of the utility model plays a role of automatic compensation, and when the sheath 4 is worn, the surface contact of the sheath 4 and the nozzle valve block 2 is always kept, so that the tightness between the sheath 4 and the nozzle valve block 2 is ensured, the service life of the sheath 4 is prolonged, and the working stability of the paver is ensured.

In the specific content of the above embodiment, any combination of the technical features may be performed without contradiction, and for brevity of description, all possible combinations of the technical features are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The utility model provides a nozzle assembly, its characterized in that includes piston rod (1), nozzle valve piece (2) and nozzle (3), the periphery parcel of piston rod (1) free end has sheath (4), nozzle valve piece (2) are including first mounting hole (21), passage way hole (22) and second mounting hole (23) that the order intercommunication set up, first mounting hole (21) lateral part intercommunication has inflow hole (24), first mounting hole (21) bottom intercommunication has taper hole (25) that the diameter reduces gradually from top to bottom, be connected with first arc surface (27) between the side of first conical surface (26) of taper hole (25) and passage way hole (22), in first mounting hole (21) are located to sheath (4) the outer peripheral face of sheath (4) with first arc surface (27) contact seal just the outer peripheral face of sheath (4) for can with second conical surface (41) that first conical surface (26) looks in taper hole (25), nozzle (3) are installed in second mounting hole (23).

2. The nozzle assembly according to claim 1, wherein the radius of the inflow hole (24) is larger than the distance between the central axis of the inflow hole (24) and the bottom surface of the first mounting hole (21).

3. The nozzle assembly according to claim 1, further comprising a bellows sheath (6), the bellows sheath (6) being fitted around the outer circumference of the piston rod (1).

4. A nozzle assembly according to claim 3, wherein the sheath (4) comprises a connecting portion (42) and a tapered portion (43), the connecting portion (42) being provided between the corrugated sheath (6) and the tapered portion (43), the second tapered surface (41) being provided at the outer periphery of the tapered portion (43).

5. The nozzle assembly according to claim 1, characterized in that the second mounting hole (23) is a cylindrical hole, the inner wall of the second mounting hole (23) is provided with an internal thread, the end of the nozzle (3) is provided with an external thread, and the nozzle (3) and the second mounting hole (23) are in threaded connection with the external thread through the internal thread.

6. The nozzle assembly of claim 5, wherein the internal threads and the external threads are both tubular threads.

7. A nozzle assembly according to any one of claims 1 to 6, characterized in that the nozzle (3) is provided at the bottom with a first outlet (31) and a second outlet (32) which are symmetrical with respect to the nozzle axis, the first outlet (31) and the second outlet (32) are separated by a partition (35), a first guiding plane (33) is provided on one side of the first outlet (31), a second guiding plane (34) is provided on one side of the second outlet (32), and the first guiding plane (33) and the second guiding plane (34) are inclined from top to bottom in the direction of the nozzle (3) axis.

8. Nozzle assembly according to claim 7, characterized in that a second circular arc surface (36) is provided between the first guiding plane (33) and the partition (35), and a third circular arc surface (37) is provided between the second guiding plane (34) and the partition (35).

9. A nozzle assembly according to any one of claims 1 to 6, wherein a relief groove (28) is provided between the passage hole (22) and the second mounting hole (23).

10. Paver, characterized in that it comprises a spray bar (7) and a nozzle assembly according to any one of claims 1 to 9, said spray bar (7) being arranged in communication with said inflow opening (24).