Brushless direct current driven low-noise axial flow water pump

Abstract

The invention relates to the technical field of axial flow water pumps, in particular to a brushless direct-current-driven low-noise axial flow water pump which comprises a pump pipe, a power device is fixedly connected to one side of the pump pipe, a rotating shaft is connected to the power device, one end of the rotating shaft extends into the pump pipe, a fixed pipe is fixedly connected into the pump pipe, and the fixed pipe and the rotating shaft are coaxially arranged. The driving assembly with the rotating plate is arranged in the pump pipe, after the flow water pump completes conveying of fluid, the power device starts to drive the impeller to rotate reversely, at the moment, the impeller drains water in the pump pipe back into the water pool, and after the water is drained, the driving assembly controls the rotating plate to rotate to separate the interior of the pump pipe from the water pool; at the moment, the interior of the pump pipe is not immersed in water any more, the situation that various algae grow on the impeller or water scales are condensed on the impeller, so that the load of the motor is increased, and abrasion of the impeller is aggravated is avoided, and therefore the service life of the flow water pump is prolonged, noise is lowered, and follow-up maintenance cost is lowered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water flow pumps, in particular to a low-noise axial water flow pump driven by a brushless direct current. BACKGROUND

[0002] An axial water flow pump is a fluid machine that relies on the rotation of an impeller to push fluid axially to achieve the function of conveying liquid. The core principle of the axial water flow pump is to push fluid axially by the lift generated by the rotation of the impeller. The axial water flow pump driven by a brushless direct current reduces the electric brush, thus having good noise reduction effect. Therefore, it is usually applied to water body landscapes in offices or public places.

[0003] Some water body landscapes are installed with axial water flow pumps driven by a brushless direct current. These water flow pumps do not need to continuously circulate water. For example, some artistic water landscape devices only start to supplement water when the water level drops to a certain extent to maintain the beauty of the water landscape. These water flow pumps also need to be low-noise to avoid affecting the surrounding people. These water flow pumps have one end completely immersed in the bottom of the pool, so that the impeller of the water flow pump is immersed in water. In addition, the water flow pump is only started when it is needed. Therefore, the water flow pump is in a state of stopping working most of the time. The water in the pump pipe does not flow for a long time. At this time, various algae will grow on the inner wall of the pump pipe and the impeller, or scale will condense on the impeller. If the impeller is started at this time, not only will the load of the motor increase, but also the wear of the impeller will be aggravated. In addition, in a low-temperature environment, if the water in the pump pipe freezes, it will generate a great pressure on the inner wall of the pump pipe. When the pressure exceeds the bearing limit of the pump pipe, the pump pipe will be broken.

[0004] To solve the above problems, the prior art provides some solutions, for example, patent application No. CN202420271534.7 provides a new brushless DC water pump, which comprises a rotor, an impeller, a rotating shaft, a waterproof cover and a shell. The shell is provided with a water pumping cavity and a rotor mounting cavity. The rotor is arranged in the rotor mounting cavity. The waterproof cover is arranged on the rotor mounting cavity. The impeller is arranged in the water pumping cavity. The water pumping cavity is provided with a water inlet and a water outlet. When the rotor starts, the rotating shaft drives the impeller to rotate to form negative pressure in the water pumping cavity, forcing water to flow from the water inlet into the water pumping cavity and then out of the water outlet. During use, the water flows through the water pumping cavity. Due to the sealing of the waterproof cover, the water cannot enter the rotor mounting cavity, preventing water and foreign matter from entering the rotor mounting cavity. The rotation of the rotor is not affected by the dirt adhered to the gap between the rotor and the rotor mounting cavity. The rotor is not stuck, blocked or jammed due to foreign matter or scale crystallization caused by long-term non-use, thereby avoiding the failure of the water pump. Although this design avoids the contact between the rotor and the water, scale crystallization may occur when the impeller is not used for a long time, and the condensation of scale on the impeller may cause the impeller to wear out and produce noise. SUMMARY

[0005] The present application aims to provide a low-noise axial flow water pump driven by a brushless DC motor to solve the problem that water in the pump pipe does not flow for a long time, algae grow on the inner wall of the pump pipe and scale condenses on the impeller. Starting the impeller at this time not only increases the load of the motor, but also exacerbates the wear of the impeller. In addition, in a low-temperature environment, if the water in the pump pipe freezes, it will generate a large pressure on the inner wall of the pump pipe, which may cause the pump pipe to break.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] A low-noise axial flow water pump driven by a brushless DC motor, comprising a pump pipe, a power device fixedly connected to one side of the pump pipe, a rotating shaft connected to the power device, the rotating shaft extending into the pump pipe at one end, a fixed pipe fixedly connected to the pump pipe, the fixed pipe being coaxial with the rotating shaft, an impeller connected to one end of the rotating shaft in the pump pipe, a mounting seat fixedly connected to the inside of the pump pipe, the mounting seat being coaxial with the pump pipe, a drive assembly with a rotating plate arranged in the mounting seat, the drive assembly being connected to the rotating shaft, the rotating plate being rotatably connected to the mounting seat, and the drive assembly driving the rotating plate to rotate around the mounting seat when the rotating shaft reverses.

[0008] It is easy to understand that the general water pump will have one end completely immersed in the bottom of the pool, so that the impeller of the water pump is immersed in the water, which will cause the water in the pump pipe to flow for a long time, at which time the inner wall of the pump pipe and the impeller will grow various algae or condense scale, at which time the start of the impeller will not only increase the load of the motor, but also exacerbate the wear of the impeller, so that the impeller produces noise when rotating, when the scale condenses on the impeller, the flowability of the surface of the impeller is destroyed, and in a low temperature environment, if the water in the pump pipe freezes, it will produce a great pressure on the inner wall of the pump pipe, when the pressure exceeds the bearing limit of the pump pipe, the pump pipe will be broken, the design is provided with a driving assembly with a rotating plate in the pump pipe, when the water pump starts to work normally, the driving assembly controls the rotating plate to open, at which time the pump pipe is connected with the pool, and the water pump works normally, and when the water pump completes the delivery of the fluid, the driving device starts to drive the impeller to reverse, at which time the impeller will discharge the water in the pump pipe back to the pool, and when the water is discharged, the driving assembly controls the rotating plate to rotate and separates the pump pipe from the pool, at which time the pump pipe is no longer immersed in the water, avoiding the growth of various algae or condensation of scale on the impeller, thereby increasing the load of the motor and exacerbating the wear of the impeller, at which time the noise is reduced, thereby prolonging the service life of the water pump, reducing the noise, and reducing the subsequent maintenance cost.

[0009] Preferably, the driving assembly comprises a rotating rod one, the rotating rod one is provided with a rotating groove at one end, the rotating rod one is rotatably connected in the rotating groove, a one-way bearing is arranged between the rotating rod one and the inner wall of the rotating groove, the rotating rod one is fixedly connected with two control rods one at one end, the number of the rotating plates is two, the rotating rod two is fixedly connected on the rotating plate, the rotating rod two on the two rotating plates is rotatably connected with the mounting seat, a torsional spring is arranged between the rotating rod two and the mounting seat, the control rod two is fixedly connected on the rotating rod two, the control rod one on the two rotating rods one respectively contacts with the control rod two on the two rotating plates, gears are further fixedly connected on the two rotating rods two, the two gears are meshed with each other, the edges of the two rotating plates close to the inner wall of the pump pipe are attached to the inner wall of the pump pipe, and the edges of the two rotating plates close to the outer wall of the mounting seat are attached to the outer wall of the mounting seat.

[0010] It is easy to understand that when the water pump starts the impeller rotation, the rotating shaft will drive the rotating rod one to rotate through the one-way bearing, at this time the control rod one on both sides of the rotating rod one will rotate with the rotating rod one, at this time the control rod one on both sides will contact the control rod two respectively, the control rod one will exert pressure on the control rod two to make the rotating rod two start to rotate around the mounting seat, and then make the rotating plate rotate around the mounting seat, at this time the rotating plate is opened to make the water in the pool enter the pump pipe, when the impeller reverses, the rotating plate will also remain open due to the pressure of the liquid, and when the water in the pump pipe is almost discharged, the pressure of the water in the pool plus the torsional force of the torsional spring will make the rotating plate close, and when the rotating plate is in the closed state, the pressure in the pool will make the rotating plate always adhere to the inner wall of the pump pipe, therefore, the design can be started by the power device to control the driving assembly, without additional power components to drive the driving assembly, thereby reducing the manufacturing cost, and the rotating plate can use the pressure of the liquid as power when the impeller discharges water and needs to be closed, thereby reducing the load of the power device and prolonging the service life of the power device.

[0011] Preferably, two sliding grooves are formed in the mounting seat, and a pressure block is slidably connected in each sliding groove, the edge of the pressure block is attached to the inner wall of the sliding groove, and a limiting block one is fixedly connected to one side of the pressure block in the mounting seat.

[0012] It is easy to understand that when the power device drives the driving assembly to close, the rotating rod two will rotate around the mounting seat at this time, the limiting block two on the rotating rod two will move with the rotating rod two at this time, the limiting block two will come to one side of the limiting block one, when the rotating plate is in the closed state, the pressure in the pool will not only act on the rotating plate, but also act on the mounting seat, at this time the pressure block on the mounting seat will slide along the sliding groove after being pressed, at this time the limiting block one on the pressure block will move with the pressure block, at this time the limiting block one will contact the limiting block two, at this time the rotating plate will always remain open due to the limitation of the limiting block one, and cannot rotate towards the closed direction, therefore, the design avoids the rotating plate in the pump pipe from rotating back and forth when the water pump is working normally due to the change of the liquid pressure in the pool or the vibration of the pump pipe, thereby affecting the flow of the liquid in the pump pipe and the working efficiency of the water pump, the design can use the pressure of the liquid to reinforce the rotating plate, the structure is simple and compact, the stability of the driving assembly is improved, and the working efficiency of the water pump when working normally is ensured.

[0013] Preferably, a limiting block three is arranged on the limiting block two, the limiting block three is in the form of a circular arc, and the limiting block three is coaxially arranged with the rotating rod two.

[0014] It is easy to understand that the design sets the limiting block three on the limiting block two, and the limiting block three is arc-shaped, when the limiting block two rotates with the rotating rod two, the limiting block three will move with the limiting block two, at this time, because the limiting block three always maintains contact with the limiting block one, and the limiting block three is arc-shaped, so the limiting block three always maintains pressure on the limiting block one during the movement of the limiting block two, at this time, the limiting block one cannot move during the movement of the limiting block two, only when the limiting block two moves to the side of the limiting block one, the limiting block three is away from the limiting block one, at this time, the pressure block can start to drive the limiting block one to move and limit the limiting block two, therefore, the design avoids that the pressure block moves due to the pressure of the liquid when the rotating plate is not completely opened, and drives the limiting block one to move, and then the limiting block one and the limiting block two contact and collide, and then noise is generated to cause wear, and the opening of the rotating plate is also affected, therefore, the design avoids the wear and noise caused by the contact and collision between the limiting block one and the limiting block two, and improves the service life of the driving assembly.

[0015] Preferably, the impeller is rotatably connected with the rotating shaft, a limiting groove is formed in the impeller, and a sliding block is fixedly connected to the rotating shaft and slidably connected in the limiting groove.

[0016] It is easy to understand that the impeller is rotatably connected with the rotating shaft, a limiting groove is formed in the impeller, and a sliding block is fixedly connected to the rotating shaft and slidably connected in the limiting groove.

[0017] Preferably, the rotating plate is provided with a communication hole one and a communication hole two on both sides, and a sliding rod is slidably connected to both sides of the rotating plate, and a sliding plate one and a sliding plate two are fixedly connected to the sliding rod, and the sliding plate one and the sliding plate two are respectively attached to the end faces of the communication hole one and the communication hole two, and threads are formed on one end of the two sliding rods close to the inner wall of the pump pipe, and a threaded hole is formed in the inner wall of the pump pipe, and the threads on the sliding rod are screw-connected with the threaded hole on the pump pipe.

[0018] As can be easily understood, when the rotating shaft drives the driving assembly to open the rotating plate, the rotating plate will be subjected to pressure from the liquid at one end close to the pool, so that the opening of the rotating plate needs to overcome greater pressure, which will increase the load of the power device and also increase the wear of the driving assembly, so that the design opens the communication holes one and two on the rotating plate, when the rotating plate rotates, the sliding rods at both ends will be pushed due to the threaded connection, the sliding plates one and two will move with the sliding rod one, at this time the communication holes one and two will be opened, at this time the liquid will enter the pump pipe through the communication holes one and two, at this time the pressure on the rotating plate will be reduced, so that the design reduces the load of the power device when driving the driving assembly, also reduces the wear of the driving assembly, and improves the service life of the driving assembly.

[0019] Preferably, a drain pipe is opened on the pump pipe, the drain pipe communicates the inside of the pump pipe with the outside of the pump pipe, a water accumulation groove is opened on the edge of the rotating plate close to the pump pipe, one end of the drain pipe inside the pump pipe directly communicates with the water accumulation groove, and the one end of the drain pipe inside the pump pipe is hinged with a isolation plate, and the hinge between the isolation plate and the pump pipe is located close to the rotating plate.

[0020] As can be easily understood, when the impeller reverses to discharge the liquid in the pump pipe into the pool, at this time when the water in the pump pipe is about to be discharged, the rotating plate is closed due to the pressure from the pool, at this time after the rotating plate is completely closed, there will still be a part of liquid remaining in the pump pipe, if this part of liquid is not cleaned, bacteria and algae may breed on the impeller and rotating shaft, which will increase the load of the motor and aggravate the wear of the impeller, and the design opens the drain pipe on the pump pipe, the drain pipe communicates the inside of the pump pipe with the outside of the pump, and one end of the drain pipe inside the pump pipe is close to the rotating plate, when the rotating plate is completely closed, the impeller will continue to reverse, at this time the liquid remaining in the pump pipe will flow out of the pump pipe through the drain pipe and flow into the pool, so that the design avoids that there is liquid remaining in the pump pipe after the rotating plate is completely closed, which will cause bacteria and algae to breed on the impeller and rotating shaft, which will increase the load of the motor and aggravate the wear of the impeller, and cause the friction of the impeller to increase and generate noise, so that the design further improves the service life of the flow pump and reduces the noise.

[0021] Preferably, the two rotating plates are close to each other at one side, the two rotating plates are chamfered at the side away from the impeller, the two rotating plates are close to each other after being completely opened, and the two rotating plates are parallel to the axis of the pump pipe.

[0022] It is easy to understand that when the rotating plate is fully opened, the rotating plates on both sides of the mounting seat will be attached to each other, and when the rotating plate is fully opened, both rotating plates are parallel to the axis of the pump pipe, at this time, the fully opened state of the rotating plate is equivalent to the guide plate inside the pump pipe, which can stabilize the liquid flow inside the pump pipe when the water pump starts, improve the working efficiency of the water pump, and in addition, the water trough is opened on the rotating plate, when the rotating plates on both sides of the mounting seat will be attached to each other, a 'V' shape will be formed at one end of the two rotating plates, further improving the drainage effect of the rotating plate and improving the working efficiency of the water pump.

[0023] Compared with the prior art, the beneficial effects of the present application are:

[0024] 1、The driving assembly provided with the rotating plate is arranged in the pump pipe, and when the water pump completes the delivery of the fluid, the power device starts to drive the impeller to reverse, at this time, the impeller will discharge the water in the pump pipe back to the pool, and when the water is discharged, the driving assembly will control the rotating plate to rotate to separate the pump pipe from the pool, at this time, the pump pipe is no longer immersed in the water, avoiding the growth of various algae or the condensation of scale on the impeller, thereby increasing the load of the motor and aggravating the wear of the impeller, thus the design improves the service life of the water pump, reduces the noise, and reduces the subsequent maintenance cost.

[0025] 2、The control rod I is arranged on the rotating rod I, and the control rod II is arranged on the rotating rod II, so that the driving assembly can be driven by the power device, without the need for additional power components to drive the driving assembly, thereby reducing the manufacturing cost, and the rotating plate can utilize the pressure of the liquid as power when the impeller discharges water and needs to be closed, thereby reducing the load of the power device and improving the service life of the power device.

[0026] 3、The pressure block is arranged on the mounting seat, which avoids the rotating plate in the pump pipe from rotating back and forth when the water pump is working normally due to the change of the liquid pressure in the pool or the vibration of the pump pipe, thereby affecting the flow of the liquid in the pump pipe and the working efficiency of the water pump, the design can reinforce the rotating plate by utilizing the pressure of the liquid, the structure is simple and compact, the stability of the driving assembly is improved, and the working efficiency of the water pump when working normally is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structure diagram of a low-noise axial water pump driven by a brushless DC motor;

[0028] Figure 2 It is Figure 1 A-A cross-sectional view;

[0029] Figure 3 It isFigure 2 Enlarged view at B;

[0030] Figure 4 For Figure 2 Enlarged view at C;

[0031] Figure 5 For the structure diagram of the rotating plate of the application;

[0032] Figure 6 For Figure 5 Sectional view at D-D;

[0033] Figure 7 For Figure 2 Enlarged view at E.

[0034] In the figure: 1, pump pipe; 2, power device; 3, rotating shaft; 4, fixed pipe; 5, impeller; 6, mounting seat; 7, rotating plate; 8, rotating rod one; 9, rotating groove; 10, one-way bearing; 11, control rod one; 12, rotating rod two; 13, control rod two; 14, gear; 15, sliding groove; 16, pressure block; 17, limiting block one; 18, limiting block two; 19, limiting block three; 20, limiting groove; 21, sliding block; 22, communication hole one; 23, communication hole two; 24, sliding rod; 25, sliding plate one; 26, sliding plate two; 27, thread; 28, threaded hole; 29, drain pipe; 30, water collecting groove; 31, isolation plate. DETAILED DESCRIPTION

[0035] The application provides a low-noise axial flow water pump driven by a brushless DC motor, and the technical scheme is as follows:

[0036] Please refer to Figures 1 to 7 A low-noise axial flow water pump driven by a brushless DC motor, comprising a pump pipe 1, one side of the pump pipe 1 being fixedly connected with a power device 2, the power device 2 being connected with a rotating shaft 3, the rotating shaft 3 extending into the pump pipe 1 at one end, the pump pipe 1 being fixedly connected with a fixed pipe 4, the fixed pipe 4 being coaxially arranged with the rotating shaft 3, the rotating shaft 3 being connected with an impeller 5 at the end located in the pump pipe 1, the pump pipe 1 being fixedly connected with a mounting seat 6, the mounting seat 6 being coaxially arranged with the pump pipe 1, the mounting seat 6 being internally provided with a driving assembly with a rotating plate 7, the driving assembly being connected with the rotating shaft 3, the rotating plate 7 being rotatably connected with the mounting seat 6, the driving assembly driving the rotating plate 7 to rotate around the mounting seat 6 when the rotating shaft 3 reverses.

[0037] Further, please refer to Figures 1 to 7The driving assembly comprises rotating rod one 8, rotating groove 9 is formed in one end of rotating shaft 3, rotating rod one 8 is rotationally connected in the rotating groove 9, one-way bearing 10 is arranged between rotating rod one 8 and the inner wall of the rotating groove 9, two control rods one 11 are fixedly connected to one end of the rotating rod one 8, the number of rotating plates 7 is two, rotating rod two 12 is fixedly connected to the rotating plate 7, rotating rod two 12 on the two rotating plates 7 are rotationally connected with the mounting seat 6, torsional spring is arranged between rotating rod two 12 and the mounting seat 6, control rod two 13 is fixedly connected to rotating rod two 12, control rod one 11 on the two rotating rod one 8 respectively contact with control rod two 13 on the two rotating plates 7, gear 14 is further fixedly connected to the two rotating rod two 12, the two gears 14 are meshed with each other, the edges of the two rotating plates 7 close to the inner wall of the pump pipe 1 are attached to the inner wall of the pump pipe 1, the edges of the two rotating plates 7 close to the outer wall of the mounting seat 6 are attached to the outer wall of the mounting seat 6, the two rotating plates 7 are attached to each other on one side, the two rotating plates 7 are in contact with each other and are chamfered on the side away from the impeller 5, the two rotating plates 7 are attached to each other after being fully opened, and the two rotating plates 7 are parallel to the axis of the pump pipe 1.

[0038] Please refer to Figures 1 to 7 Two sliding grooves 15 are formed in the mounting seat 6, pressure blocks 16 are slidingly connected in the two sliding grooves 15, the edges of the pressure blocks 16 are attached to the inner walls of the sliding grooves 15, limit block one 17 is fixedly connected to one side of the pressure block 16 inside the mounting seat 6, limit block two 18 is fixedly connected to the rotating rod two 12, limit block one 17 is in contact with limit block two 18, limit block three 19 is arranged on limit block two 18, limit block three 19 is in the form of a circular arc, limit block three 19 is coaxially arranged with the rotating rod two 12, one side of limit block three 19 away from the rotating rod two 12 is in contact with limit block one 17, limit groove 20 is formed in the impeller 5, sliding block 21 is fixedly connected to the rotating shaft 3, and the sliding block 21 is slidingly connected in the limit groove 20.

[0039] Please refer to Figures 1 to 7 Communication holes one 22 and two 23 are respectively formed in the two sides of the rotating plate 7, sliding rods 24 are slidingly connected to the two sides of the rotating plate 7, sliding plate one 25 and two 26 are fixedly connected to the sliding rods 24, the sliding plate one 25 and two 26 are respectively attached to the end faces of the communication holes one 22 and two 23, threads 27 are formed in the ends of the two sliding rods 24 close to the inner wall of the pump pipe 1, thread holes 28 are formed in the inner wall of the pump pipe 1, the threads 27 on the sliding rods 24 are in threaded connection with the thread holes 28 on the pump pipe 1, a drain pipe 29 is formed in the pump pipe 1, the drain pipe 29 communicates the inside of the pump pipe 1 with the outside of the pump pipe 1, a water collecting groove 30 is formed in the edge of the rotating plate 7 close to the pump pipe 1, one end of the drain pipe 29 inside the pump pipe 1 directly communicates with the water collecting groove 30, the one end of the drain pipe 29 inside the pump pipe 1 is hingedly connected with a partition plate 31, and the hinge connection between the partition plate 31 and the pump pipe 1 is located on the side close to the rotating plate 7.

[0040] Please refer to Figures 1 to 7 , the power device 2 starts to drive the rotation shaft 3 to rotate forward, the slider 21 on the rotation shaft 3 slides along the limiting groove 20, at this time the rotation shaft 3 rotates and drives the rotating rod 8 to rotate, at this time the control rod 11 on both sides of the rotating rod 8 respectively contacts the control rod 13 on both sides, the control rod 11 applies pressure to the control rod 13, and the control rod 13 rotates, the control rod 13 further drives the rotating rod 12 to rotate, the rotating rod 12 further drives the limiting block 18, the limiting block 19 and the rotating plate 7 to rotate, at this time the threads 27 on one end of the sliding rod 24 on both sides of the rotating plate 7 begin to rotate around the threaded holes 28 on the inner wall of the pump pipe 1, the sliding rod 24 begins to move and drives the sliding plate 25 and the sliding plate 26 to move, at this time the communication hole 22 and the communication hole 23 are opened, the liquid enters the pump pipe 1 through the communication hole 22 and the communication hole 23, at this time the slider 21 on the rotation shaft 3 contacts the inner wall of the limiting groove 20, the rotation shaft 3 begins to drive the impeller 5 to rotate forward, at this time the rotation shaft 3 continues to drive the rotating rod 8 to rotate, the rotating plate 7 is gradually opened, when the rotating plate 7 is completely opened, the rotating plate 7 on both sides of the mounting seat 6 will contact each other, at this time the control rod 13 on both sides of the rotating rod 8 is away from the control rod 11 on both sides of the rotating rod 8, at this time the pressure of the liquid in the pump pipe 1 acts on the pressure block 16 on both sides of the mounting seat 6, the pressure block 16 moves after being subjected to the pressure, and drives the limiting block 17 to move, the limiting block 17 moves a certain distance and contacts the limiting block 18,

[0041] Please refer to Figures 1 to 7 , the power device 2 drives the rotation shaft 3 to reverse, the slider 21 on the rotation shaft 3 slides along the limiting groove 20, the slider 21 contacts the inner wall of the limiting groove 20 after sliding a certain distance, at this time the rotation shaft 3 drives the impeller 5 to reverse, due to the limitation of the one-way bearing 10, the rotation shaft 3 will not drive the rotating rod 8 to rotate, at this time the impeller 5 begins to discharge the liquid in the pump pipe 1 back into the pool, at this time the pressure block 16 side forms a negative pressure, the pressure block 16 drives the limiting block 17 to move, the rotating plate 7 remains open under the pressure of the liquid, when the liquid in the pump pipe 1 moves away from the impeller 5, the pressure of the liquid in the pump pipe 1 decreases, the rotating plate 7 is opened and closed under the action of the torsional spring plus the pressure of the liquid on one side of the pool, at this time the sliding plate 25 and the sliding plate 26 reset and reseal the communication hole 22 and the communication hole 23, when the rotating plate 7 is completely closed, the impeller 5 continues to rotate, at this time the isolation class is opened under the pressure, the liquid in the pump pipe 1 is discharged out of the pump pipe 1 through the drain pipe 29.

[0042] The above describes one specific embodiment of the present application in detail in combination with the drawings, but the present application is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, replacements and variations of the embodiment can be made without departing from the principles and ideas of the present application, and should still fall within the protection scope of the present application.

Claims

1. A low-noise axial flow water pump driven by a brushless DC motor, comprising a pump pipe (1), one side of which is fixedly connected with a power device (2), the power device (2) is connected with a rotating shaft (3), one end of the rotating shaft (3) extends into the pump pipe (1), a fixed pipe (4) is fixedly connected in the pump pipe (1), and the fixed pipe (4) is coaxially arranged with the rotating shaft (3), characterized in that, The rotating shaft (3) is connected with the impeller (5) at one end in the pump pipe (1), the pump pipe (1) is fixedly connected with the mounting seat (6), the mounting seat (6) is coaxially arranged with the pump pipe (1), the mounting seat (6) is provided with the drive assembly with the rotating plate (7) in the inside, the drive assembly is connected with the rotating shaft (3), the rotating plate (7) is rotatably connected with the mounting seat (6), when the rotating shaft (3) is reversed, the drive assembly drives the rotating plate (7) to rotate around the mounting seat (6).

2. A low noise brushless DC driven axial flow water pump as claimed in claim 1, wherein, The drive assembly includes rotating rod one (8), the rotating shaft (3) is provided with rotating groove (9) at one end, the rotating rod one (8) is rotatably connected in the rotating groove (9), the one-way bearing (10) is arranged between the rotating rod one (8) and the inner wall of the rotating groove (9), the rotating rod one (8) is fixedly connected with two control rods one (11) at one end, the number of the rotating plate (7) is 2, the rotating plate (7) is fixedly connected with the rotating rod two (12), the rotating rod two (12) on the two rotating plates (7) is rotatably connected with the mounting seat (6), the torsional spring is arranged between the rotating rod two (12) and the mounting seat (6), the control rod two (13) is fixedly connected on the rotating rod two (12), the control rod one (11) on the two rotating rod one (8) is respectively in contact with the control rod two (13) on the two rotating plates (7), the gear (14) is also fixedly connected on the two rotating rod two (12), the two gears (14) are meshed with each other, the edges of the two rotating plates (7) close to the inner wall of the pump pipe (1) are attached to the inner wall of the pump pipe (1), and the edges of the two rotating plates (7) close to the outer wall of the mounting seat (6) are attached to the outer wall of the mounting seat (6).

3. A low noise brushless DC driven axial flow water pump as claimed in claim 2, wherein, Two sliding grooves (15) are formed in the mounting seat (6), the pressure block (16) is slidably connected in the two sliding grooves (15), the edge of the pressure block (16) is attached to the inner wall of the sliding groove (15), the limit block one (17) is fixedly connected on one side of the pressure block (16) in the mounting seat (6), the limit block two (18) is fixedly connected on the rotating rod two (12), and the limit block one (17) is in contact with the limit block two (18).

4. A low noise brushless DC driven axial flow water pump as claimed in claim 3, wherein, The limit block three (19) is arranged on the limit block two (18), the limit block three (19) is of arc type, the limit block three (19) is coaxially arranged with the rotating rod two (12), and one side, away from the rotating rod two (12), of the limit block three (19) is in contact with the limit block one (17).

5. A low noise brushless DC driven axial flow water pump as claimed in claim 2 wherein, The impeller (5) is rotatably connected with the rotating shaft (3), the limit slot (20) is formed in the impeller (5), and the sliding block (21) is fixedly connected on the rotating shaft (3).

6. A low noise brushless DC driven axial flow water pump as claimed in claim 2, wherein, The rotating plate (7) is provided with a communication hole one (22) and a communication hole two (23) on both sides, the sliding rod (24) is slidably connected to both sides of the rotating plate (7), the sliding plate one (25) and the sliding plate two (26) are fixedly connected to the sliding rod (24), the sliding plate one (25) and the sliding plate two (26) are respectively attached to the end face of the communication hole one (22) and the communication hole two (23), the threaded hole (28) is formed in the inner wall of the pump pipe (1), and the threaded hole (28) is threadedly connected with the threaded hole (28) in the pump pipe (1).

7. A low noise brushless DC driven axial flow water pump as claimed in claim 6, wherein The pump pipe (1) is provided with a drain pipe (29), the drain pipe (29) is communicated between the inside of the pump pipe (1) and the outside of the pump pipe (1), the edge of the rotating plate (7) is provided with a water collecting groove (30) near the pump pipe (1), one end of the drain pipe (29) in the pump pipe (1) is directly communicated with the water collecting groove (30), and the drain pipe (29) is hingedly connected with the isolation plate (31) at one end in the pump pipe (1).

8. A low noise brushless DC driven axial flow water pump as claimed in claim 7, wherein, The two rotating plates (7) are attached to each other on one side, the two rotating plates (7) are chamfered on the side away from the impeller (5), the two rotating plates (7) are attached to each other when fully opened, and the two rotating plates (7) are parallel to the axis of the pump pipe (1).

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