Self-balancing high-pressure water cleaning nozzle

Abstract

The utility model discloses a self-balancing high-pressure water cleaning sprayer which comprises a base and a gun head body. The device further comprises a mandrel and a core sleeve. The core sleeve is fixedly connected to the inner wall of a cavity in the center of the gun head body, and the core shaft is inserted into the core sleeve and is in clearance fit with the core sleeve; the rear end of the mandrel is fixedly connected with the front end of the tailstock in a sealed mode. The tail end of the core shaft blind hole is provided with two core shaft through holes penetrating through the core shaft in the radial direction. A first containing cavity is formed in the position, corresponding to the through hole, of the outer wall of the mandrel. The core sleeve is correspondingly provided with water permeable holes; the water permeable hole is located between the two through holes; a second containing cavity is formed in the position, corresponding to the water permeable hole, of the outer wall of the core sleeve. And the second accommodating cavity is communicated with the nozzle of the gun head body. All movable parts are free of axial force brought by high-pressure water, a layer of water film can be formed in the relative rotation process of the core shaft and the core sleeve, abrasion and heating are avoided, pollutants can be prevented from entering in the drainage process, bearing-free design is achieved, oil lubrication is not needed, the structure is simple, maintenance is not needed, and cost is low. And the service life and reliability of the nozzle are greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of high-pressure cleaning technology, and relates to a self-rotating nozzle, specifically a self-balancing high-pressure water cleaning nozzle. Background Technology

[0002] In the field of high-pressure water cleaning, self-rotating nozzles are commonly used to clean scale or debris inside pipes. The nozzle body has eccentric nozzle holes with a certain backward tilt angle, so during the high-pressure water jet spraying process, the nozzle body has the ability to rotate and advance due to the reaction force of the water jet. Typically, a bearing is installed between the nozzle and the base to support its high-speed rotation. For example, this bearing is shown in patent CN109876937A, entitled "Self-Rotating Nozzle".

[0003] The problem is that in the field of high-pressure water cleaning, once high-pressure water is introduced into the nozzle, it generates an axial force of nearly 20,000 N inside the nozzle body. This powerful axial force requires a bearing structure to resist it, which results in a complex and bulky bearing structure in existing nozzles. It also requires lubrication and an oil seal structure to seal the lubricating oil, leading to frequent maintenance, short lifespan, and poor reliability. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model provides a self-balancing high-pressure water cleaning nozzle. The purpose is to design a bearingless, self-rotating nozzle structure that takes into account the high-speed rotating nozzle body and the strong axial force, and can reduce internal wear, improve life and reliability, so as to be suitable for the field of high-pressure water cleaning.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a self-balancing high-pressure water cleaning nozzle, comprising a tailstock with a rear end for receiving high-pressure water and a nozzle body rotatable around the tailstock axis. The nozzle body is provided with several eccentric nozzles, and the nozzles spray in a backward-tilting direction to drive the nozzle body to rotate and advance when spraying high-pressure water; it also includes a mandrel and a core sleeve; the core sleeve is fixedly connected to the inner wall of the cavity at the center of the nozzle body, and its front end has a radially outward-protruding first convex ring portion, the inner side of which abuts against the stepped surface of a pre-set stepped hole at the front end of the nozzle body; the mandrel is inserted into the core sleeve and has a clearance fit with the core sleeve; the rear end of the mandrel is sealed and fixedly connected to the front end of the tailstock, so that high-pressure water in the tailstock can enter a pre-set blind hole in the mandrel; its front end has a radially outward-protruding second convex ring portion, the inner side of which abuts against The copper pad rests against one side, and the other side of the copper pad abuts against the front end face of the first convex ring. Two radially penetrating through-holes are provided at the end of the blind hole, the two through-holes being spaced apart along the axial direction of the mandrel, and their axes are perpendicular. A first recess is provided on the outer wall of the mandrel corresponding to the through-holes, forming a first cavity between the mandrel and the mandrel sleeve. The mandrel sleeve has multiple circumferentially spaced water-permeable holes corresponding to the first cavity. Each water-permeable hole is located between two through-holes, ensuring that each water-permeable hole is axially offset from both through-holes. A second recess is provided on the outer wall of the mandrel corresponding to the water-permeable holes, forming a second cavity between the mandrel sleeve and the nozzle body. The second cavity communicates with the nozzle, allowing high-pressure water to flow sequentially through the tailstock, blind hole, through-hole, first cavity, water-permeable hole, and second cavity before being ejected from the nozzle.

[0006] As a further optimization, the rear end sidewall edge of the gun head body extends rearward to form a sleeve at the rear end of the gun head body; the sleeve is fitted onto the outer side of the front end of the tailstock; a magnetic damping assembly is provided between the inner wall of the sleeve and the outer wall of the tailstock; the magnetic damping assembly includes multiple magnet blocks and a sensing ring, the magnet blocks surround and are fixed on the tailstock; the polarities of two adjacent magnet blocks are opposite; the sensing ring is fixed on the inner wall of the sleeve; a gap is left between the magnet blocks and the sensing ring.

[0007] As a further optimization, the front end of the mandrel is provided with an axially protruding screw head, and the rear end is provided with an external thread, which is used to screw the rear end of the mandrel into the threaded hole preset at the front end of the tailstock, so that the rear end of the mandrel is sealed and fixedly connected to the front end of the tailstock.

[0008] As a further optimization, the tailstock is provided with a threaded interface at its rear end; the front end of the support joint is provided with a threaded head corresponding to the threaded interface, for sealing and fixing the front end of the support joint to the rear end of the tailstock; the rear end of the support joint is provided with a water pipe bayonet for connecting a high-pressure water pipe; multiple support wheels are connected to the outer wall of the support joint, so that when the nozzle body rotates and moves in the pipe to be cleaned, the support wheels abut against the inner wall of the pipe, thereby positioning the nozzle body at the center of the pipe.

[0009] As a further optimization, the outer wall of the support joint is screwed with three circumferentially distributed connecting seats, each of which is threaded with a support plate, and the outer end of the support plate is connected to the support wheel.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] All moving parts of this invention are not subject to axial force from high-pressure water. During the relative rotation of the spindle and the core sleeve, a water film is formed, which avoids wear and heat generation and also prevents contaminants from entering during the discharge process. Furthermore, the bearing-free design eliminates the need for oil lubrication, resulting in a simple structure that requires no maintenance and greatly improves the lifespan and reliability of the nozzle. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0013] Figure 2 This is a cross-sectional structural diagram of an embodiment of the present utility model;

[0014] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0015] Figure 4 This is a schematic diagram of the mandrel structure according to an embodiment of the present invention;

[0016] Figure 5 This is a schematic diagram of the core sleeve structure of an embodiment of the present invention.

[0017] The correspondence between the technical features in the figure and the reference numerals is as follows: Tailstock 1; Threaded interface 11; Gun head body 2; Nozzle 21; Mandrel 3; Blind hole 31; Through hole 32; Second convex ring 33; Tightening head 34; Core sleeve 4; First convex ring 41; Water permeable hole 42; Second cavity 43; Sealing ring groove 44; Copper pad 5; Magnet block 6; Induction ring 61; Support joint 7; Threaded head 71; Water pipe bayonet 72; Support wheel 73; Connecting seat 74; Support plate 75. Detailed Implementation

[0018] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of this utility model and are not intended to limit the scope of protection of this utility model.

[0019] Example 1: Please refer to Figure 1-5 ;

[0020] This embodiment provides a self-balancing high-pressure water cleaning nozzle for cleaning dirt from the inner wall of pipes. It includes a tailstock 1 with a high-pressure water inlet and a nozzle body 2 that can rotate around the axis of the tailstock 1. The nozzle body 2 has several eccentrically positioned nozzles 21, with the nozzles 21 spraying in a backward-tilting direction to drive the nozzle body 2 to rotate and advance when spraying high-pressure water. It also includes a spindle 3 and a core sleeve 4. The core sleeve 4 is fixed to the inner wall of the cavity at the center of the nozzle body 2, with its front end edge... A first protruding ring portion 41 is provided, the inner side of which abuts against the stepped surface of a pre-set stepped hole at the front end of the gun head body 2; the mandrel 3 is inserted into the mandrel sleeve 4 and is clearance-fitted with the mandrel sleeve 4; the rear end of the mandrel 3 is sealed and fixedly connected to the front end of the tailstock 1, allowing high-pressure water in the tailstock 1 to pass into a pre-set blind hole 31 inside the mandrel 3; its front end is provided with a radially protruding second protruding ring portion 33, the inner side of which abuts against the side of the copper pad 5, the copper pad... 5. The other side abuts against the front end face of the first convex ring 41; the end of the blind hole 31 is provided with two radially penetrating through holes 32 of the mandrel 3, the two through holes 32 are spaced apart along the axial direction of the mandrel 3, and the axes of the two through holes 32 are perpendicular; on the outer wall of the mandrel 3, a first recess is provided corresponding to the through holes 32, for forming a first cavity between the mandrel 3 and the core sleeve 4; the core sleeve 4 is provided with a plurality of circumferentially spaced and evenly distributed water-permeable holes 42 corresponding to the first cavity; the water-permeable holes 42 are provided with a plurality of circumferentially spaced and evenly distributed water-permeable holes 42. Hole 42 is located between the two through holes 32, allowing each water-permeable hole 42 to be axially misaligned with both through holes 32. A second recess is provided on the outer wall of the core sleeve 4 corresponding to the water-permeable hole 42, forming a second cavity 43 between the core sleeve 4 and the nozzle body 2. The second cavity 43 communicates with the nozzle 21, allowing the high-pressure water to flow sequentially through the tailstock 1, blind hole 31, through hole 32, first cavity, water-permeable hole 42, and second cavity 43 before being ejected from the nozzle 21. Preferably, sealing rings are provided on both sides of the second cavity 43 to ensure its sealing, and the core sleeve 4 is sealed and fixedly connected to the nozzle body 2. A sealing ring groove 44 is provided on the outer wall of the core sleeve 4.

[0021] The working principle includes: after high-pressure water enters the blind hole 31, it enters the first cavity through the through hole 32. With the core sleeve 4 rotating with the gun head body 2, each water-permeable hole 42 is axially misaligned and passes above the through hole 32, causing the pressure in the first cavity to fluctuate at a high frequency. This causes the core sleeve 4 to bulge, thereby causing the high-pressure water to seep into the gap between the mandrel 3 and the core sleeve 4. While the core sleeve 4 is rotating at high speed, a water film forms in the gap. This water film allows for some leakage, which is dynamically stable with subsequent high-pressure water replenishment. The leaking water film avoids wear and heat generation and also prevents contaminants from entering the gap during the leakage process. Therefore, this device requires no bearings, no lubricating oil, and no oil seal structure. It requires no maintenance. The axial force generated by the high-pressure water in the blind hole 31 is borne by the mandrel 3. The mandrel 3 has a robust structure and strong load-bearing capacity, sufficient to resist the axial force generated by the high-pressure water. The rotating nozzle body 2 does not bear the axial force of the high-pressure water. Instead, the reaction force from the nozzle 21 is applied to the spindle 3 through the first convex ring 41, the copper pad 5, and the second convex ring 33. The spindle 3 then drives the entire nozzle to move through the pipe. The flow from the gap has two directions: the copper pad 5 at the front end and the edge of the core sleeve 4 at the rear end. The flow passing through the copper pad 5 can be discharged through both sides of the pad 5. It is evident that the first convex ring rotates while the second convex ring remains stationary. The copper pad 5, influenced by friction as it rotates with the first convex ring, naturally thins as it wears. Its flow rate can adapt autonomously to the amount of wear, forming a water film on both sides of the copper pad 5, which also serves a self-lubricating function. Therefore, this nozzle utilizes the flow for self-lubrication and can resist the strong axial force generated by the high-pressure water, thereby reducing internal wear and improving its lifespan and reliability.

[0022] To limit the rotational speed of the nozzle body 2 and prevent excessive rotation from forming water mist and thus losing its ability to remove scale buildup in the pipe, the rear end sidewall edge of the nozzle body 2 extends rearward to form a sleeve at the rear end. This sleeve is fitted onto the outer side of the front end of the tailstock 1. A magnetic damping assembly is provided between the inner wall of the sleeve and the outer wall of the tailstock 1. The magnetic damping assembly includes multiple magnet blocks 6 and a sensing ring 61. The magnet blocks 6 surround and are fixed to the tailstock 1. Adjacent magnet blocks 6 have opposite polarities. The sensing ring 61 is fixed to the inner wall of the sleeve. A gap is left between the magnet blocks 6 and the sensing ring 61. Therefore, this embodiment uses magnetic speed limiting. The magnets are arranged with intersecting polarities in the circumferential direction, and the magnetic field lines generate resistance as they cut the sensing ring 61. Thus, the magnetic damping is positively correlated with the rotational speed, adaptively reducing the rotational speed of the nozzle body 2. Furthermore, the magnet blocks 6 can be glued or directly adsorbed onto the tailstock 1 without requiring other fixing methods. After the discharge enters the gap, it can also prevent pollutants from entering the magnetic damping cavity during the discharge process, thus protecting the lifespan of the magnetic damping mechanism.

[0023] In an exemplary sealing and fixing method, the mandrel 3 has an axially protruding screw head 34 at its front end and an external thread at its rear end, for screwing the rear end of the mandrel 3 into a pre-set threaded hole at the front end of the tailstock 1, thereby sealing and fixing the rear end of the mandrel 3 to the front end of the tailstock 1. Preferably, the mandrel 3 has a tapered head at its rear end and a tapered hole at the front end of the tailstock 1; the tapered surface sealing can improve the sealing effect.

[0024] To accommodate the movement of the nozzle in the pipe, the tailstock 1 has a threaded interface 11 at its rear end; the support joint 7 has a threaded head 71 at its front end corresponding to the threaded interface 11, which is used to seal and fix the front end of the support joint 7 to the rear end of the tailstock 1; the support joint 7 has a water pipe bayonet 72 at its rear end, which is used to connect a high-pressure water pipe; multiple support wheels 73 are connected to the outer wall of the support joint 7, which are used to abut against the inner wall of the pipe when the nozzle body 2 rotates and moves in the pipe to be cleaned, so that the nozzle body 2 is located in the center of the pipe.

[0025] A further optimization is that the outer wall of the support joint 7 is threaded with three circumferentially distributed connecting seats 74, and each connecting seat 74 is threaded with a support plate 75. The outer end of the support plate 75 is connected to the support wheel 73. It can be seen that the three support plates 75 are detachable, and different support plates 75 can be replaced to adapt to different pipe diameters, while the support joint 7 itself remains unchanged, resulting in better adaptability and more flexible use.

[0026] In summary, all moving parts in this embodiment are not subject to axial force from high-pressure water. During the relative rotation of the spindle 3 and the core sleeve 4, a water film is formed, which avoids wear and heat generation and also prevents contaminants from entering during the discharge process. Furthermore, the bearing-free design eliminates the need for oil lubrication, resulting in a simple structure that requires no maintenance and greatly improves the lifespan and reliability of the nozzle.

[0027] The parts of this utility model not described in detail are prior art; for those skilled in the art, the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A self-balancing high-pressure water cleaning nozzle, comprising a tailstock (1) with a rear end capable of receiving high-pressure water and a nozzle body (2) rotatable about the axis of the tailstock (1), wherein the nozzle body (2) is provided with a plurality of eccentric nozzles (21), and the spray direction of the nozzles (21) is tilted backward, for driving the nozzle body (2) to rotate and advance when spraying high-pressure water; characterized in that: It also includes a mandrel (3) and a core sleeve (4); the core sleeve (4) is fixed to the inner wall of the cavity in the center of the gun head body (2), and a radially protruding first protruding ring (41) is provided at the front port edge, and the inner side of the first protruding ring (41) abuts against the step surface of the step hole preset at the front end of the gun head body (2). The mandrel (3) is inserted into the core sleeve (4) and is clearance-fitted with the core sleeve (4); the rear end of the mandrel (3) is sealed and fixed to the front end of the tailstock (1) so that the high-pressure water in the tailstock (1) can be introduced into the blind hole (31) preset in the mandrel (3); Its front end is provided with a radially outwardly protruding second protruding ring (33), the inner side of the second protruding ring (33) abuts against the side of the copper pad (5), and the other side of the copper pad (5) abuts against the front end surface of the first protruding ring (41); The blind hole (31) has two radially penetrating through holes (32) at its end, the two through holes (32) being spaced apart along the axial direction of the mandrel (3) and the axes of the two through holes (32) being perpendicular; on the outer wall of the mandrel (3), a first recess is provided corresponding to the through holes (32) for forming a first cavity between the mandrel (3) and the core sleeve (4); the core sleeve (4) is provided with a plurality of circumferentially spaced and evenly distributed water-permeable holes (42) corresponding to the first cavity; the water-permeable holes (42) are located between the two through holes (31) 2) The position between the permeable hole (42) and the two through holes (32) are misaligned; on the outer wall of the core sleeve (4), a second recess is provided corresponding to the permeable hole (42) to form a second cavity (43) between the core sleeve (4) and the gun head body (2); the second cavity (43) is connected to the nozzle (21) so that the high-pressure water flows through the tailstock (1), blind hole (31), through hole (32), first cavity, permeable hole (42), and second cavity (43) in sequence and is then sprayed out from the nozzle (21).

2. The self-balancing high-pressure water cleaning nozzle according to claim 1, characterized in that: The rear end sidewall edge of the gun head body (2) extends rearward to form a sleeve at the rear end of the gun head body (2); the sleeve is fitted onto the outer side of the front end of the tailstock (1); a magnetic damping assembly is provided between the inner wall of the sleeve and the outer wall of the tailstock (1); the magnetic damping assembly includes a plurality of magnet blocks (6) and a sensing ring (61), the plurality of magnet blocks (6) surround and are fixed on the tailstock (1); the polarities of two adjacent magnet blocks (6) are opposite; the sensing ring (61) is fixed on the inner wall of the sleeve; a gap is left between the magnet blocks (6) and the sensing ring (61).

3. The self-balancing high-pressure water cleaning nozzle according to claim 2, characterized in that: The mandrel (3) has an axially protruding screw head (34) at its front end and an external thread at its rear end, which is used to screw the rear end of the mandrel (3) into the threaded hole at the front end of the tailstock (1), so that the rear end of the mandrel (3) is sealed and fixedly connected to the front end of the tailstock (1).

4. The self-balancing high-pressure water cleaning nozzle according to claim 1, characterized in that: The tailstock (1) has a threaded interface (11) at its rear end; the support connector (7) has a threaded head (71) at its front end that corresponds to the threaded interface (11), which is used to seal and fix the front end of the support connector (7) to the rear end of the tailstock (1); the support connector (7) has a water pipe bayonet (72) at its rear end, which is used to connect a high-pressure water pipe. Multiple support wheels (73) are connected to the outer wall of the support joint (7), so that when the gun head body (2) rotates and moves in the pipe to be cleaned, the support wheels (73) abut against the inner wall of the pipe so that the gun head body (2) is located at the center of the pipe.

5. A self-balancing high-pressure water cleaning nozzle according to claim 4, characterized in that: The outer wall of the support joint (7) is screwed with three circumferentially distributed connecting seats (74), and each connecting seat (74) is screwed with a support plate (75). The outer end of the support plate (75) is connected with the support wheel (73).

Images