A high-pressure flushing device for a road maintenance vehicle

Abstract

The present invention relates to the technical field of environmental sanitation equipment, and particularly relates to a high-pressure flushing device for a road maintenance vehicle, including a maintenance vehicle. A power unit is arranged inside the maintenance vehicle, and a tail flushing unit is further arranged at the tail of the maintenance vehicle. The power unit includes: a water tank, a water pump, a pressurizing member, a valve group, and a control member. The water pump is communicated with the water tank through the pressurizing member, and the output end of the water pump is connected to the tail flushing unit. The tail flushing unit is used to flush the fine dirt on the road surface, and a high-pressure nozzle is used to perform a strong high-pressure flushing on stubborn stains. For the flushing process of the flushing cross beam, the water flow in the water tank is conveyed into the flushing pipe by the water pump. Both ends of the flushing pipe are closed, and the middle part is connected to the output end of the water pump. A plurality of flushing holes are evenly distributed at intervals on the lower end of the outer wall of the flushing pipe. Under the action of high pressure, the water flow flushes the dirt on the ground through the flushing holes, and the cleaning operation of the road surface is completed while avoiding the cutting effect.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental sanitation equipment, and particularly to a high-pressure flushing device for a road maintenance vehicle. Background Art

[0002] An environmental sanitation vehicle is also called a road maintenance vehicle. Different from conventional environmental sanitation vehicles, a road maintenance vehicle can be used alone as a road sweeper for road cleaning and suction operations; it can also be used as a high-pressure flushing vehicle for road flushing and suction operations; it can also combine road cleaning and suction with high-pressure water flushing to be used as a washing and sweeping vehicle, realizing multiple combinations of cleaning, flushing, and washing and suction, so as to meet the various needs of different users, and can be widely applied to the flushing and cleaning operations of urban main roads and viaducts.

[0003] During the flushing process of a road maintenance vehicle, the water outlet pressure and water outlet flow rate of the nozzle jointly determine the cleaning effect and cleaning efficiency. If the water outlet pressure of the nozzle is too small, a good cleaning effect cannot be produced, resulting in too low cleaning efficiency; while if the water outlet pressure of the nozzle is too large (exceeding 35 MPa), a "cutting effect" will be produced on most road ancillary facilities and squares. Moreover, the water outlet pressure and water outlet flow rate of the nozzle also jointly determine the swinging force and reaction force at the nozzle. When the water pressure exceeds 20 MPa, if the water outlet flow rate of the nozzle is too large, the generated swinging force and reaction force are too large, making it easy for the operator to lose control of the cleaning gun, and also resulting in the inability to clean or reduced cleaning efficiency, and causing a great deal of water resource waste.

[0004] Therefore, during the flushing process of a road maintenance vehicle, how to complete the cleaning operation of the road while avoiding the cutting effect has become a technical problem. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-pressure flushing device for a road maintenance vehicle, which can complete the cleaning operation of the road while avoiding the cutting effect.

[0006] The present invention is realized through the following technical solutions:

[0007] A high-pressure flushing device for a road maintenance vehicle includes a maintenance vehicle. A power unit is arranged inside the maintenance vehicle, and a tail flushing unit is further arranged at the tail of the maintenance vehicle. The power unit includes: a water tank, a water pump, a pressurizing component, a valve group, and a control component. The water pump is communicated with the water tank through the pressurizing component, and the output end of the water pump is connected to the tail flushing unit;

[0008] The tail flushing unit includes: a fixed frame connected to the maintenance vehicle, a flushing beam, a rotating part and a high-pressure nozzle. The flushing beam is movably arranged on the fixed frame through the rotating part. The high-pressure nozzle is arranged on the fixed frame. A flushing pipe is detachably connected to the bottom of the flushing beam. The high-pressure nozzle and the flushing pipe are both connected to the output end of the water pump.

[0009] It should be noted that in the prior art, during the flushing process of the road maintenance vehicle, the water pressure and flow rate of the water outlet at the nozzle jointly determine the cleaning effect and cleaning efficiency. If the water pressure of the nozzle is too low, it will not produce a good cleaning effect, which will lead to too low cleaning efficiency; while if the water pressure of the nozzle is too high (over 35 MPa), it will produce a "cutting effect" on most road ancillary facilities and squares. The existence of the "cutting effect" will not only seriously affect the service life and appearance of road ancillary facilities, but even during the cleaning process, there are adverse effects caused by the collision between high-pressure water flow and small stones. In addition, the existing high-pressure nozzles are prone to cause the high-pressure water flow to splash dirt to nearby areas during high-pressure cleaning operations.

[0010] Based on the above situation, a high-pressure flushing device for a road maintenance vehicle is proposed. The tail flushing unit is used to flush the fine dirt on the road surface, and the high-pressure nozzle is used to perform strong high-pressure flushing on stubborn stains. For the flushing process of the flushing beam, the water flow in the water tank is transported to the flushing pipe by a water pump. The two ends of the flushing pipe are closed, and the middle part is connected to the output end of the water pump. There are a number of flushing holes evenly spaced at the lower end of the outer wall of the flushing pipe. Under the action of high pressure, the water flows through the flushing holes to flush the dirt on the ground. For the high-pressure nozzle, what is completely different from the nozzle in the prior art is that the high-pressure nozzle in this application has multiple high-pressure water flows, namely, the high-pressure flow located in the center, the first vortex and the second vortex outside the high-pressure flow, the pressure of the high-pressure flow is the largest, the first vortex and the second vortex have opposite rotation directions, and can form two "protective covers" outside the high-pressure flow, thereby avoiding serious splashing caused by the high-pressure flow contacting the ground.

[0011] Furthermore, the output end of the water pump is connected to a unloading assembly, and the unloading assembly includes: an unloading valve, a safety valve, a vent valve and a high-pressure ball valve group, one end of the safety valve is connected to the output end of the water pump, one end of the unloading valve is connected to the other end of the safety valve, one end of the high-pressure ball valve group is connected to the other end of the unloading valve, the other end of the high-pressure ball valve group is connected to the high-pressure nozzle and the flushing pipe, and the vent valve is connected to the high-pressure ball valve group. It should be noted that for the unloading assembly, based on the above structure, it is possible to avoid the problem of relative sliding of the power unit under high-pressure environment, causing the internal structure of the valve to deviate and deform, and the problem of unstable coordination between the valve groups caused by this, thereby avoiding the problem of insufficiently stable pressure of the high-pressure flushing water generated by the water jetting pipeline.

[0012] Furthermore, the high-pressure nozzle includes a nozzle seat and a nozzle which are detachably connected. A swirl member is rotatably disposed inside the nozzle. The swirl member can isolate the water flow in the nozzle into three streams, which are, from the inside to the outside, a high-pressure stream, a first swirl, and a second swirl. It should be noted that the high-pressure nozzle and the ground to be cleaned are not on the same horizontal plane. There is a certain angle between the sprayed high-pressure stream and the ground to be cleaned, and it is extremely easy to cause water splashing under the action of the high-pressure stream, and it can also stir up ground debris, causing pollution. The first swirl and the second swirl have opposite swirl directions, and can form two "protective covers" outside the high-pressure stream, thereby avoiding serious splashing caused by the contact between the high-pressure stream and the ground.

[0013] Furthermore, the first swirl and the second swirl have opposite swirl directions. Since the distance between the first swirl and the second swirl is small, when the first swirl and the second swirl have opposite swirl directions, most of the water flows splashed by the two can also be offset.

[0014] Furthermore, the swirl member includes a high-pressure pipe and a swirl pipe. The high-pressure pipe is disposed inside the swirl pipe and its end is fixedly connected to the nozzle. The swirl pipe is disposed inside the nozzle and its end is rotatably disposed with the nozzle. The inside of the high-pressure pipe is a high-pressure flow channel. The space between the outer wall of the high-pressure pipe and the inner wall of the swirl pipe is the first swirl channel. The space between the outer wall of the swirl pipe and the inner wall of the nozzle is the second swirl channel. It should be noted that based on the above structure, the water flow in the nozzle can be isolated into three streams.

[0015] Furthermore, the high-pressure pipe includes a first acceleration section, a second acceleration section, and a third acceleration section in sequence along the water flow direction. Among them, the first acceleration section and the second acceleration section are straight sections, and the inner diameter of the first acceleration section is larger than that of the second acceleration section. The third acceleration section is an arc section, and its inner diameter increases along the water flow direction. Based on the basic principles of hydrodynamics, it can be understood that the pressure of the second acceleration section is greater than that of the first acceleration section, and the pressure of the third acceleration section is greater than that of the second acceleration section.

[0016] Preferably, the swirl pipe has the same structure as the high-pressure pipe. The swirl pipe and the high-pressure pipe are sleeved, and having the same structure can reduce the retention area in the second swirl channel.

[0017] Preferably, swirl vanes are rotatably disposed on the outer circumferences of the first acceleration section, the second acceleration section, and the third acceleration section. By providing the swirl vanes, the first swirl in the first swirl channel rotates and flows, so as to have an obvious offset in the circumferential direction when shooting out from the nozzle.

[0018] Preferably, a spiral groove is provided on the outer circumference of the swirl pipe. The provision of the spiral groove can make the second swirl have an obvious offset in the circumferential direction when shooting out from the nozzle.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0020] 1. The present invention flushes the fine dirt on the road surface through the tail flushing unit, and uses the high-pressure nozzle to perform a strong high-pressure flushing on the stubborn stains. For the flushing process of the flushing cross beam, the water flow in the water tank is conveyed into the flushing pipe through the water pump. Both ends of the flushing pipe are closed, the middle is connected to the output end of the water pump, and a number of flushing holes are evenly distributed at intervals on the lower end of the outer wall of the flushing pipe. Under the action of high pressure, the water flow flushes the dirt on the ground through the flushing holes, and completes the cleaning operation of the road surface while avoiding the cutting effect;

[0021] 2. The high-pressure nozzle is not on the same horizontal plane as the ground to be cleaned, and there is a certain angle between the sprayed high-pressure flow and the ground to be cleaned. And under the action of the high-pressure flow, it is extremely easy to cause the water flow to splash, and the ground debris is stirred up, causing pollution. The first swirl and the second swirl of the present invention have opposite swirl directions, and can form two "protective covers" outside the high-pressure flow, thereby avoiding the serious splashing caused by the contact between the high-pressure flow and the ground;

[0022] 3. The present invention avoids the problem that the power unit generates relative sliding in a high-pressure environment, resulting in the deviation and deformation of the internal structure of the valve, and the problem of unstable cooperation between the valve groups caused thereby, and further avoids the problem of unstable pressure of the high-pressure flushing water generated by the water injection pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not constitute a limitation to the embodiments of the present invention. In the drawings:

[0024] Figure 1 is a schematic structural diagram of the present invention;

[0025] Figure 2 is a schematic structural diagram of the power unit;

[0026] Figure 3 is a schematic structural diagram of the tail flushing unit;

[0027] Figure 4 is a schematic structural diagram of the unloading assembly;

[0028] Figure 5 is a schematic structural diagram of the high-pressure nozzle;

[0029] Figure 6 is a schematic cross-sectional structure diagram of the high-pressure nozzle.

[0030] Marks in the drawings and corresponding component names:

[0031] 1 - Maintenance vehicle;

[0032] 2 - Power unit, 21 - Water tank, 22 - Water pump, 23 - Booster, 24 - Valve group, 25 - Control part, 26 - Unloading assembly;

[0033] 3 - Tail flushing unit, 31 - Fixed frame, 32 - Flushing cross beam, 33 - Rotating part, 34 - High - pressure nozzle, 35 - Flushing pipe;

[0034] 261 - Unloading valve, 262 - Safety valve, 263 - Vent valve, 264 - High - pressure ball valve group;

[0035] 341 - Nozzle seat, 342 - Nozzle, 343 - Swirling part, 344 - High - pressure flow, 345 - First swirl, 346 - Second swirl, 347 - High - pressure pipe, 348 - Swirling pipe, 349 - High - pressure flow channel;

[0036] 350 - First swirl channel, 351 - Second swirl channel, 352 - Swirling blade, 353 - Spiral groove, 354 - Booster chamber;

[0037] 3471 - First speed - increasing section, 3472 - Second speed - increasing section, 3473 - Third speed - increasing section. Detailed implementation mode

[0038] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in combination with embodiments and drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and do not limit the present invention. It should be noted that the present invention has been in the actual R & D and use stage.

[0039] Embodiment 1:

[0040] Please refer to the attached Figures 1 to 6 A high - pressure flushing device of a road maintenance vehicle 1, including the maintenance vehicle 1. A power unit 2 is arranged inside the maintenance vehicle 1, and a tail flushing unit 3 is also arranged at the tail of the maintenance vehicle 1. The power unit 2 includes: a water tank 21, a water pump 22, a booster 23, a valve group 24 and a control part 25. The water pump 22 is communicated with the water tank 21 through the booster 23, and the output end of the water pump 22 is connected to the tail flushing unit 3;

[0041] The tail flushing unit 3 includes: a fixed frame 31 connected to the maintenance vehicle 1, a flushing cross beam 32, a rotating part 33 and a high - pressure nozzle 34. The flushing cross beam 32 is movably arranged on the fixed frame 31 through the rotating part 33. The high - pressure nozzle 34 is arranged on the fixed frame 31. A flushing pipe 35 is detachably connected below the flushing cross beam 32. Both the high - pressure nozzle 34 and the flushing pipe 35 are connected to the output end of the water pump 22.

[0042] It should be noted that in the prior art, during the flushing process of the road maintenance vehicle 1, the water outlet pressure and water outlet flow rate of the nozzle jointly determine the cleaning effect and cleaning efficiency. If the water outlet pressure of the nozzle is too small, a good cleaning effect cannot be achieved, resulting in too low cleaning efficiency; while if the water outlet pressure of the nozzle is too large (exceeding 35 MPa), a "cutting effect" will be generated on most road ancillary facilities and squares. The existence of the "cutting effect" will not only seriously affect the service life and appearance beauty of road ancillary facilities, but even during the cleaning process, there is also a situation where the high-pressure water flow impacts with small stones and causes adverse effects. In addition, when the existing high-pressure nozzle 34 performs high-pressure cleaning operations, it is easy to cause the high-pressure water flow to splash the dirt to the vicinity.

[0043] Based on the above situation, a high-pressure flushing device for the road maintenance vehicle 1 is proposed. The fine dirt on the road surface is flushed by the tail flushing unit 3, and the stubborn stains are powerfully flushed by the high-pressure nozzle 34. For the flushing process of the flushing cross beam 32, the water flow in the water tank 21 is conveyed into the flushing pipe 35 by the water pump 22. Both ends of the flushing pipe 35 are closed, and the middle part is connected to the output end of the water pump 22. Moreover, a number of flushing holes are evenly distributed at intervals on the lower end of the outer wall of the flushing pipe 35. Under the action of high pressure, the water flow flushes the dirt on the ground through the flushing holes. For the high-pressure nozzle 34, which is completely different from the nozzles in the prior art, the high-pressure nozzle 34 in this application has multiple high-pressure water flows, that is, the central high-pressure flow 344, the first swirl flow 345 and the second swirl flow 346 outside the high-pressure flow 344. The pressure of the high-pressure flow 344 is the largest, and the first swirl flow 345 and the second swirl flow 346 have opposite swirl directions, which can form two "protective covers" outside the high-pressure flow 344, thereby avoiding serious splashing caused by the contact of the high-pressure flow 344 with the ground.

[0044] It should also be noted that a liquid level detector is provided on the water tank 21 to detect the water level inside the water tank 21. The liquid level detector and the unloading assembly 26 are both signal-connected to the control member 25. The control member 25 can control the internal pressure of the corresponding pipeline of the valve group 24 by controlling the unloading assembly 26. The pressurizing member 23 is a pressurizing device, such as a supercharger, etc. It can be understood that during the use of this application, an air compressor must also be connected; the rotating member 33 is signal-connected to the control member 25. More preferably, there are transmission structures such as screw rods and linkages, including but not limited to structures that can achieve relative rotation. The flushing cross beam 32 can rotate axially along the flushing pipe 35 under the control of the control member 25, as well as move left and right, etc. Moreover, the high-pressure nozzle 34 can also be arranged on the swivel base to achieve its rotation in the up-down and left-right directions;

[0045] It should be noted that the output end of the water pump 22 is connected with a unloading assembly 26, and the unloading assembly 26 includes: a unloading valve 261, a safety valve 262, a ventilation valve 263 and a high-pressure ball valve group 264. One end of the safety valve 262 is connected with the output end of the water pump 22, one end of the unloading valve 261 is connected with the other end of the safety valve 262, one end of the high-pressure ball valve group 264 is connected with the other end of the unloading valve 261, the other end of the high-pressure ball valve group 264 is connected with the high-pressure nozzle 34 and the flushing pipe 35, and the ventilation valve 263 is connected with the high-pressure ball valve group 264. It should also be noted that for the unloading assembly 26, based on the above structure, it can avoid the problem that the power unit 2 generates relative sliding in a high-pressure environment, resulting in the deviation and deformation of the internal structure of the valve, and the problem of unstable cooperation between valve groups caused thereby, and further avoid the problem of unstable pressure of the high-pressure flushing water generated by the water injection pipeline. It should also be noted that in the prior art, during the working process of the air compressor, it has been performing repeated operations of load-unloading-load. When the air compressor fills the high-pressure nozzle 34 to the working pressure through the unloading assembly 26 and the booster 23, the air compressor enters the unloading state. In the above process, the unloading time ratio needs to reach 50% to 75%, otherwise, the reliability and durability of the air compressor will be affected. More seriously, it will cause relative sliding of the power unit 2 in a high-pressure environment. Based on the above problems, the unloading assembly 26 specifically passes: when the system pressure in each communication pipeline reaches the opening pressure of the unloading valve 261, the ventilation valve 263 opens, and the air compressor starts to unload; when the system pressure drops to the closing pressure of the unloading valve 261, the ventilation valve 263 closes, and the air compressor starts to load. In the above assembly, a safety valve 262 for setting the system safety pressure is also connected. In addition, on the basis of the safety valve 262, a high-pressure ball valve group 264 for realizing action conversion is also connected. When the unloading valve 261 enters the unloading state, the pressure of the system directly returns to the water tank 21 (realizing action conversion according to the high-pressure ball valve group 24), and the pressure of the water tank 21 is approximately zero, thereby avoiding the deviation and deformation of the internal structure of the valve caused by the excessive pressure of the high-pressure flushing pipe 35 valve group 24 in the prior art. In this embodiment, it is more preferable that the ventilation valve 263 is a six-way two-position five-way ventilation valve 263 group, and the connection between valve groups 24 adopts the way of British combination end straight-through.

[0046] It should be noted that the high-pressure nozzle 34 includes a nozzle seat 341 and a nozzle 342 that are detachably connected. A swirl member 343 is rotatably disposed inside the nozzle 342. The swirl member 343 can isolate the water flow in the nozzle 342 into three streams, which are, from the inside to the outside, a high-pressure stream 344, a first swirl 345, and a second swirl 346. It should also be noted that the high-pressure nozzle 34 and the ground to be cleaned are not on the same horizontal plane. There is a certain angle between the sprayed high-pressure stream 344 and the ground to be cleaned. And under the action of the high-pressure stream 344, it is extremely easy to cause water flow to splash, and it can also stir up ground debris, causing pollution. The first swirl 345 and the second swirl 346 have opposite swirl directions, and can form two "protective covers" outside the high-pressure stream 344, thereby avoiding serious splashing caused by the contact between the high-pressure stream 344 and the ground. In this embodiment, preferably, the outer diameter of the nozzle 342 decreases along the water flow conveying direction; the nozzle seat 341 is detachably connected to the water conveying pipe by means of threaded connection or the like.

[0047] It should be noted that the swirl directions of the first swirl 345 and the second swirl 346 are opposite. Since the distance between the first swirl 345 and the second swirl 346 is small, when the swirl directions of the first swirl 345 and the second swirl 346 are opposite, most of the water flows splashed by the two can also be offset.

[0048] It should be noted that the swirl member 343 includes a high-pressure pipe 347 and a swirl pipe 348. The high-pressure pipe 347 is disposed inside the swirl pipe 348 and its end is fixedly connected to the nozzle 342. The swirl pipe 348 is disposed inside the nozzle 342 and its end is rotatably disposed with the nozzle 342. The inside of the high-pressure pipe 347 is a high-pressure flow channel 349. The space between the outer wall of the high-pressure pipe 347 and the inner wall of the swirl pipe 348 is a first swirl channel 350. The space between the outer wall of the swirl pipe 348 and the inner wall of the nozzle 342 is a second swirl channel 351. It should be noted that based on the above structure, the water flow in the nozzle 342 can be isolated into three streams.

[0049] It should be noted that the high-pressure pipe 347 includes a first acceleration section 3471, a second acceleration section 3472, and a third acceleration section 3473 in sequence along the water flow direction. Among them, the first acceleration section 3471 and the second acceleration section 3472 are straight sections, and the inner diameter of the first acceleration section 3471 is larger than that of the second acceleration section 3472. The third acceleration section 3473 is an arc section, and its inner diameter increases along the water flow direction. Based on the basic principles of hydrodynamics, it can be understood that the pressure in the second acceleration section 3472 is greater than that in the first acceleration section 3471, and the pressure in the third acceleration section 3473 is greater than that in the second acceleration section 3472. As is well known, according to Bernoulli's equation, the flow of fluid in a pipeline should follow the conversion relationship between kinetic energy and potential energy. For example, when the gravitational potential energy is constant, if the pressure increases, the kinetic energy will inevitably decrease. Kinetic energy is reflected by the flow velocity. Considering the flow rate in the pipeline as constant, the larger the cross-sectional size, the smaller the flow velocity, and vice versa. Different from this, the diameter of the first acceleration section 3471 in this application is significantly larger than that of the second acceleration section 3472. Based on the above principles, under the premise of ignoring other influencing factors, those skilled in the art can reasonably deduce that the fluid pressure in the second acceleration section 3472 is less than that in the first acceleration section 3471, that is, the relative flow velocity is faster. When the internal fluid flows through the second acceleration section 3472 from the first acceleration section 3471, the flow velocity will increase significantly. It should also be noted that the diameter of the third acceleration section 3473 is larger than that of the second acceleration section 3472. The applicant once tried to extend the second acceleration section 3472 without setting the third acceleration section 3473. When the pipeline pressure increased, the flow velocity at the nozzle was relatively fixed. According to the "Laval effect", when the one-dimensional constant entropy flow velocity in a convergent pipeline can only continuously change to a fixed value, that is, reaching the critical state, this is the limit of the pipe. After that, the flow velocity will neither increase nor decrease. This phenomenon in the convergent pipeline is also called flow choking. According to the "Laval effect", if the pipeline is expanded after the critical section, when the downstream physical boundary conditions at the pipeline outlet section meet the flow velocity requirements, the flow velocity can increase again. Based on this, the applicant added a third acceleration section 3473 at the output end of the second acceleration section 3472 to avoid flow choking, so that the flow velocity at the nozzle increases again and the flushing effect is improved.

[0050] In this embodiment, preferably, the cyclone tube 348 has the same structure as the high-pressure tube 347. The cyclone tube 348 and the high-pressure tube 347 are sleeved, and their identical structures can reduce the retention area in the second swirl path 351. Preferably, swirl vanes 352 are rotatably arranged on the outer circumferences of the first acceleration section 3471, the second acceleration section 3472, and the third acceleration section 3473. By providing the swirl vanes 352, the first swirl flow 345 in the first swirl path 350 rotates, so that there is a significant offset in the circumferential direction when it exits from the nozzle 342. Preferably, a spiral groove 353 is formed on the outer circumference of the cyclone tube 348. The provision of the spiral groove 353 enables the second swirl flow 346 to have a significant offset in the circumferential direction when it exits from the nozzle 342.

[0051] Embodiment 2:

[0052] This embodiment only describes the parts different from Embodiment 1, specifically:

[0053] As shown in the appendix Figure 6 Since there are generally corners at the joints of the nozzle 342, from the perspective of hydrodynamics, there are large turbulent flows and retention areas at the corners, which have a great obstructive effect on the pressure of the fluid. In view of this situation, the applicant proposes to provide a pressure-boosting cavity on the inner wall of the nozzle 342. The preferred shape of the pressure-boosting cavity is semi-“water droplet-shaped”, and the concave part of the pressure-boosting cavity is close to the flow direction of the water flow. Based on this structure, the turbulent flow generated at the corners can be reduced, thereby increasing the internal pressure of the pipeline, which is beneficial to obtaining a better cleaning effect under the same conditions.

[0054] The above specific embodiments have further elaborated on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-pressure flushing device for a road maintenance vehicle (1), comprising the maintenance vehicle (1), wherein a power unit (2) is arranged inside the maintenance vehicle (1), and it is characterized in that: A tail flushing unit (3) is also provided at the tail of the maintenance vehicle (1). The power unit (2) includes: a water tank (21), a water pump (22), a pressurizing member (23), a valve group (24), and a control member (25). The water pump (22) is communicated with the water tank (21) through the pressurizing member (23), and the output end of the water pump (22) is connected to the tail flushing unit (3). The tail flushing unit (3) includes: a fixing frame (31) connected to the maintenance vehicle (1), a flushing cross beam (32), a rotating member (33), and a high-pressure nozzle (34). The flushing cross beam (32) is movably arranged on the fixing frame (31) through the rotating member (33). The high-pressure nozzle (34) is arranged on the fixing frame (31). A flushing pipe (35) is detachably connected below the flushing cross beam (32). The high-pressure nozzle (34) and the flushing pipe (35) are both connected to the output end of the water pump (22). An unloading assembly (26) is connected to the output end of the water pump (22). The unloading assembly (26) includes: an unloading valve (261), a safety valve (262), a ventilation valve (263), and a high-pressure ball valve group (264). One end of the safety valve (262) is connected to the output end of the water pump (22). One end of the unloading valve (261) is connected to the other end of the safety valve (262). One end of the high-pressure ball valve group (264) is connected to the other end of the unloading valve (261). The other end of the high-pressure ball valve group (264) is connected to the high-pressure nozzle (34) and the flushing pipe (35). The ventilation valve (263) is connected to the high-pressure ball valve group (264). The high-pressure nozzle (34) includes a spray base (341) and a nozzle (342) which are detachably connected. A swirl member (343) is rotatably arranged inside the nozzle (342). The swirl member (343) can isolate the water flow in the nozzle (342) into three streams, which are, from the inside to the outside, a high-pressure stream (344), a first swirl (345), and a second swirl (346) in sequence. The first swirl (345) and the second swirl (346) have opposite swirl directions.

2. The high-pressure flushing device for a road maintenance vehicle (1) according to claim 1, and it is characterized in that: The swirl member (343) includes a high-pressure pipe (347) and a swirl pipe (348). The high-pressure pipe (347) is arranged inside the swirl pipe (348) and its end is fixedly connected to the nozzle (342). The swirl pipe (348) is arranged inside the nozzle (342) and its end is rotatably arranged with the nozzle (342). The inside of the high-pressure pipe (347) is a high-pressure flow channel (349). The space between the outer wall of the high-pressure pipe (347) and the inner wall of the swirl pipe (348) is a first swirl channel (350). The space between the outer wall of the swirl pipe (348) and the inner wall of the nozzle (342) is a second swirl channel (351).

3. The high-pressure flushing device for a road maintenance vehicle (1) according to claim 2, and it is characterized in that: The high-pressure pipe (347) successively includes a first acceleration section (3471), a second acceleration section (3472), and a third acceleration section (3473) along the water flow direction. Among them, the first acceleration section (3471) and the second acceleration section (3472) are straight sections, and the inner diameter of the first acceleration section (3471) is larger than that of the second acceleration section (3472). The third acceleration section (3473) is an arc section, and its inner diameter increases along the water flow direction.

4. The high-pressure flushing device for a road maintenance vehicle (1) according to claim 3, and it is characterized in that: The swirl pipe (348) has the same structure as the high-pressure pipe (347).

5. The high-pressure flushing device for a road maintenance vehicle (1) according to claim 4, and it is characterized in that: Swirl vanes (352) are rotatably arranged on the outer peripheries of the first acceleration section (3471), the second acceleration section (3472), and the third acceleration section (3473).

6. The high-pressure flushing device for a road maintenance vehicle (1) according to claim 2, and it is characterized in that: A spiral groove (353) is formed on the outer periphery of the swirl pipe (348).

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