Permanent magnet axial flow pump for municipal engineering

Abstract

The permanent magnet axial flow pump for municipal engineering comprises a permanent magnet axial flow pump body, a permanent magnet motor is arranged on the upper side of the interior of the permanent magnet axial flow pump body, a driving shaft is arranged at the output end of the permanent magnet motor through a coupler, and four supporting legs which are annularly distributed at equal intervals are arranged on the upper side of the interior of the permanent magnet axial flow pump body; the device further comprises first transmission cavities formed in the supporting legs, first transmission rods are rotationally arranged on the upper sides of the interiors of the first transmission cavities correspondingly, and second transmission rods are arranged in the middles of the interiors of the first transmission cavities correspondingly. According to the permanent magnet axial flow pump for municipal engineering, sundries are effectively prevented from entering the permanent magnet axial flow pump, winding and blocking of an impeller and other parts in the pump are avoided, the working efficiency of the permanent magnet axial flow pump is greatly improved, the service life of the permanent magnet axial flow pump is greatly prolonged, an extra power source is not needed, synchronous operation can be conducted by starting the permanent magnet axial flow pump, and cost is reduced. And the use cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet axial flow pumps, in particular to a permanent magnet axial flow pump for municipal engineering. Background Art

[0002] Municipal engineering refers to the construction of various public infrastructure supporting urban life, which together constitute the cornerstone of the normal operation of the city. Municipal engineering includes but is not limited to urban roads, bridges, water supply and drainage systems, sewage treatment facilities, urban flood control projects, landscaping, street lighting, environmental sanitation and other urban public utility projects. The construction and maintenance of these projects are directly related to the quality of life of urban residents and are an important part of urban development. In the water supply and drainage systems of municipal engineering, permanent magnet axial flow pumps are widely used in the fields of water supply and rainwater discharge. They can quickly replenish water pressure to meet the large water needs of residents and enterprises. At the same time, during the rainwater discharge process, they can also quickly discharge accumulated water to prevent urban waterlogging. In addition, permanent magnet axial flow pumps are also suitable for flood control, drainage, fire fighting and other occasions, providing a strong guarantee for the safety and stability of the city.

[0003] For example, the Chinese patent "A Submersible Axial Flow Pump" with announcement number CN207004852U is a submersible axial flow pump, which includes a motor housing, a pump shaft, a water guide cone, and an impeller seat. The pump shaft is axially installed in the motor housing, and the impeller seat is connected to the end of the pump shaft. A water guide cone is fixed between the motor housing and the impeller seat. It is characterized in that a water baffle is provided at the end of the water guide cone, the middle part of the water baffle is in contact with the pump shaft, and a mechanical seal that cooperates with the pump shaft is provided at the lower end of the water baffle, and one end of the mechanical seal is sleeved on the outer side of one end of the impeller seat.

[0004] Although the sealing structure of the submersible axial flow pump in the above-mentioned prior art is simple and the sealing effect is good, in the actual application scenarios of municipal engineering, especially when it involves sewage treatment, rainwater discharge or water diversion projects in rivers and lakes, it is easy for flocculent debris such as leaves, plastic bags, aquatic plants, etc. to enter the pump body. If these debris are not effectively intercepted in time, they will not only block the water inlet and flow channel of the pump, affecting the hydraulic performance of the pump, but may also cause wear on the impeller and seals of the pump, shortening the service life of the pump. Therefore, it does not meet the existing needs. In this regard, we propose a permanent magnet axial flow pump for municipal engineering. Summary of the invention

[0005] The purpose of the present invention is to provide a permanent magnet axial flow pump for municipal engineering, so as to solve the problem raised in the above background technology that the permanent magnet axial flow pump lacks the ability to intercept flocculent debris such as plastic bags and aquatic plants when used in municipal engineering, which easily leads to clogging of the pump port and affecting the hydraulic performance.

[0006] To achieve the above object, the present invention provides the following technical solution: a permanent magnet axial flow pump for municipal engineering, comprising a permanent magnet axial flow pump, a permanent magnet motor is arranged on the upper side of the permanent magnet axial flow pump, a driving shaft is arranged on the output end of the permanent magnet motor through a coupling, and four support legs equidistantly distributed in a ring shape are arranged on the upper side of the permanent magnet axial flow pump;

[0007] It also includes a first transmission cavity, which is opened inside the supporting leg, a first transmission rod is rotatably arranged on the upper side of the first transmission cavity, a second transmission rod is arranged at the middle position of the first transmission cavity, a third transmission rod is rotatably arranged on the lower side of the first transmission cavity, and one end of the third transmission rod extends to the outside of the first transmission cavity;

[0008] The cam is an angularly-shaped member which is adapted to move relative to the first and second wheels, and the cam is a member which is adapted to move relative to the first and second wheels.

[0009] It also includes a support block, which is arranged at the lower end of the support leg. Three extension blocks are arranged inside the support block, and the extension blocks are all connected to the support block through a damping device.

[0010] Preferably, a first bevel gear is disposed on the upper side of the outer wall of the driving shaft, a second bevel gear is disposed at one end of each of the first transmission rods, and the second bevel gears are meshingly connected with the first bevel gears.

[0011] Preferably, a third bevel gear is disposed on one side of the outer wall of the first transmission rod and on the upper end of the second transmission rod, and the third bevel gears are meshingly connected.

[0012] Preferably, a fourth bevel gear is disposed on the lower end of the second transmission rod and the outer wall of one end of the third transmission rod located inside the first transmission cavity, and the fourth bevel gears are meshingly connected with each other.

[0013] Preferably, a first return spring is sleeved on one side of the outside of the first guide rod, one end of the first return spring is connected to the first moving block, and the other end of the first return spring is connected to the second transmission chamber.

[0014] Preferably, a second return spring is sleeved on one side of the exterior of the second guide rod, one end of the second return spring is connected to the connecting block, and the other end of the second return spring is connected to the second transmission chamber.

[0015] Preferably, an annular pull block is provided on the inner side of the replacement seat, and the annular pull block is in contact with the replacement seat, a connecting rod is bonded and fixed at the middle position of the inner side of the first moving block, one end of the connecting rod passes through and extends to the outside of the second transmission cavity, and the end of the connecting rod located outside the second transmission cavity is bonded and fixed to the annular pull block.

[0016] Preferably, the upper and lower sides of one end of the rotating rod located inside the replacement seat are provided with limiting grooves, one end of the second movable block is adhered and fixed to the limiting block, one end of the limiting block passes through and extends to the outside of the second transmission cavity, and the end of the limiting block located outside the second transmission cavity is adapted to the limiting groove.

[0017] Preferably, two first bearings are disposed outside the first transmission rod, the outer walls of the first bearings are connected to the first transmission cavity, and the inner walls of the first bearings are connected to the outer wall of the first transmission rod.

[0018] Preferably, two second bearings are disposed outside the second transmission rod, the outer walls of the second bearings are connected to the first transmission cavity, and the inner walls of the second bearings are connected to the outer wall of the second transmission rod.

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

[0020] 1. The present invention provides four supporting legs on the upper side of the outer wall of the permanent magnet axial flow pump, and transmission cavities are provided inside the supporting legs. When the permanent magnet motor is started, the driving shaft drives the impeller to rotate, and the first transmission rod is meshed and connected with the second bevel gear to make the first transmission rod rotate synchronously, and the second transmission rod is meshed and driven by the third bevel gear to make the second transmission rod rotate synchronously, and the third transmission rod is meshed and connected with the second transmission rod, and the third transmission rod drives the replacement seat to make the rotating rod drive the winding rod to rotate synchronously. Before flocculent debris enters the permanent magnet axial flow pump, the flocculent debris can be wound by the rotating winding rod, so that the flocculent debris is attached to the winding rod after being wound, thereby effectively preventing these debris from entering the permanent magnet axial flow pump, avoiding winding and clogging of the impeller and other components in the pump, greatly improving the working efficiency and service life of the permanent magnet axial flow pump, and without using an additional power source, the permanent magnet axial flow pump can be rotated synchronously by starting, thereby reducing the use cost.

[0021] 2. The present invention provides a replacement seat at one end of the third transmission rod. After a period of use, flocculent debris is wound and attached to the winding rod. At this time, the first moving block can be synchronously moved by pulling the annular pull block. The movement of the first moving block will release the squeezing of the second moving block, so that the limit block can be moved out of the limit groove through the elastic action of the second reset spring. The operator can pull the rotating rod to move the rotating rod out of the replacement seat, so that the winding rod can be moved out of the lower end of the permanent magnet axial flow pump with a smaller space, which is convenient for cleaning the flocculent debris on the winding rod. After cleaning, it is only necessary to pull the annular pull block again to make the limit The groove moves into the interior of the second transmission cavity, so that the rotating rod moves into the interior of the replacement seat and then the annular pull block is loosened, and the first moving block can be squeezed by the second moving block under the elastic action of the first reset spring, and the second moving block will drive the limit block to move into the interior of the upper and lower limit grooves of the rotating rod again, so that the rotating rod can be fixed, making the disassembly and assembly of the rotating rod convenient and quick, and convenient for cleaning the winding rod, simplifying the cleaning and maintenance workflow, reducing the dependence on professional tools, and allowing operators to quickly and effectively deal with flocculent debris on the winding rod without long shutdowns or complicated disassembly steps, thereby ensuring the continuous and efficient operation of the permanent magnet axial flow pump.

[0022] 3. The present invention provides an extension block inside the support block through a damping shaft, and an anti-skid pad is adhered and fixed to the lower end surface of the extension block. When the permanent magnet axial flow pump is placed for use, the support block at the lower end of the support leg can support the permanent magnet axial flow pump, and at the same time, the extension block can be rotated through the damping shaft so that the lower end of the extension block contacts the placement surface to increase the contact area. The damping shaft allows the extension block to freely adjust its angle within a certain range to adapt to different support requirements, but at the same time provides sufficient resistance through the built-in damping mechanism to avoid the extension block from rotating or shifting at will when not subject to external force, thereby enhancing the stability and firmness of the permanent magnet axial flow pump when placed, effectively preventing the displacement or tilt of the pump body due to vibration during operation, and ensuring its long-term operation reliability and safety. In particular, when the permanent magnet axial flow pump is placed on an uneven or sloped ground, by adjusting the angle of the extension block, its adaptability can be significantly improved, ensuring that the pump body always remains in a horizontal state, and optimizing the working efficiency of the permanent magnet axial flow pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 2 It is a front view schematic diagram of the internal structure of the present invention;

[0025] Figure 3 For the present invention Figure 1 A partial enlarged view of the middle A area;

[0026] Figure 4 For the present invention Figure 2 A partial enlarged view of the middle B area;

[0027] Figure 5 For the present invention Figure 2 A partial enlarged view of the middle C area;

[0028] Figure 6 For the present invention Figure 2 A partial enlarged view of area D in the middle.

[0029] In the figure: 1, permanent magnet axial flow pump; 2, permanent magnet motor; 3, drive shaft; 4, first transmission chamber; 5, first bevel gear; 6, second bevel gear; 7, first transmission rod; 8, first bearing; 9, third bevel gear; 10, second transmission rod; 11, second bearing; 12, fourth bevel gear; 13, third transmission rod; 14, replacement seat; 15, second transmission chamber; 16, first moving block; 17, second moving block; 18, first guide rod; 19, first return spring; 20, second guide rod; 21, second return spring; 22, connecting block; 23, annular pull block; 24, connecting rod; 25, limit block; 26, limit groove; 27, rotating rod; 28, winding rod; 29, support leg; 30, support block; 31, extension block. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] See also Figure 1-6 , an embodiment provided by the present invention: a permanent magnet axial flow pump for municipal engineering, comprising a permanent magnet axial flow pump 1, a permanent magnet motor 2 is arranged on the upper side of the permanent magnet axial flow pump 1, a driving shaft 3 is arranged on the output end of the permanent magnet motor 2 through a coupling, and four support legs 29 equidistantly distributed in a ring shape are arranged on the upper side of the permanent magnet axial flow pump 1;

[0032] It also includes a first transmission cavity 4, which is opened inside the support leg 29, a first transmission rod 7 is rotatably arranged on the upper side of the first transmission cavity 4, a second transmission rod 10 is arranged at the middle position of the first transmission cavity 4, and a third transmission rod 13 is rotatably arranged on the lower side of the first transmission cavity 4, and one end of the third transmission rod 13 extends to the outside of the first transmission cavity 4;

[0033] The present invention also includes a replacement seat 14, which is arranged outside the first transmission cavity 4 when the third transmission rod 13 is located. The replacement seat 14 is fixedly connected to the third transmission rod 13. A rotating rod 27 is arranged inside the replacement seat 14. The rotating rod 27 is slidably matched with the replacement seat 14, and one end of the rotating rod 27 extends to the outside of the replacement seat 14. Four groups of winding rods 28 are welded to the outer wall of the rotating rod 27 located at the outer end of the replacement seat 14. Each group of winding rods 28 is welded with five winding rods 28 distributed in an annular manner. The upper and lower sides of the replacement seat 14 are provided with a second transmission cavity 15. A first moving block 16 is disposed inside the moving cavity 15, a second moving block 17 is disposed on one side of the first moving block 16, a first guide rod 18 is welded inside the second transmission cavity 15, a second guide rod 20 is welded on one side of the second transmission cavity 15, the first moving block 16 and the first guide rod 18 and the second moving block 17 and the second guide rod 20 are connected by connecting blocks 22, the connecting blocks 22 are penetrated by the first guide rod 18 and the second guide rod 20, and the connecting blocks 22 are slidably matched with the first guide rod 18 and the second guide rod 20;

[0034] It also includes a support block 30, which is arranged at the lower end of the support leg 29. Three extension blocks 31 are arranged inside the support block 30, and the extension blocks 31 are connected to the support block 30 through a damping device.

[0035] When in use, the permanent magnet motor 2 drives the impeller to rotate and inhale water flow, and at the same time the driving shaft 3 drives the first bevel gear 5 to rotate, and then transmits it to the second bevel gear 6, the first transmission rod 7, the third bevel gear 9, the second transmission rod 10 and the fourth bevel gear 12 through meshing, and finally drives the third transmission rod 13 and the rotating rod 27 to rotate, so that the winding rod 28 rotates to wind up the flocculent debris to prevent it from entering the pump and causing blockage. When cleaning, pull the annular pulling block 23, and drive the first moving block 16 to move through the connecting rod 24, compress the first return spring 19 and release the limit on the second moving block 17. Then, under the action of the second return spring 21, the limit block 25 moves out of the limit groove 26, and the limit on the rotating rod 27 is released, so that the rotating rod 27 and the winding rod 28 can be easily pulled out for cleaning.

[0036] See also Figure 4 A first bevel gear 5 is provided on the upper side of the outer wall of the driving shaft 3, and a second bevel gear 6 is provided at one end of the first transmission rod 7, and the second bevel gear 6 is meshed and connected with the first bevel gear 5. Through the meshing transmission of the second bevel gear 6 and the first bevel gear 5, the rotational power of the driving shaft 3 can be efficiently transmitted to the first transmission rod 7, and the effect of deceleration and torque increase is achieved, making the subsequent transmission more stable and powerful.

[0037] See also Figure 2A third bevel gear 9 is provided on one side of the outer wall of the first transmission rod 7 and on the upper end of the second transmission rod 10, and the third bevel gears 9 are meshingly connected. Through the meshing connection between the third bevel gears 9, the change of transmission direction and further transmission of power are achieved, so that the second transmission rod 10 can rotate synchronously and stably, providing power support for the subsequent transmission system.

[0038] See also Figure 5 A fourth bevel gear 12 is provided on the outer wall of the lower end of the second transmission rod 10 and the third transmission rod 13 located at one end inside the first transmission chamber 4, and the fourth bevel gears 12 are meshingly connected. Through the meshing transmission of the fourth bevel gear 12, the rotational power of the second transmission rod 10 can be transmitted to the third transmission rod 13, thereby realizing the continuity and stability of the transmission system and making the power transmission more efficient.

[0039] See also Figure 6 A first return spring 19 is sleeved on one side of the outside of the first guide rod 18, one end of the first return spring 19 is connected to the first moving block 16, and the other end of the first return spring 19 is connected to the second transmission chamber 15. Through the elastic action of the first return spring 19, the first moving block 16 can squeeze and limit the second moving block 17, so that the limit block 25 moves into the inside of the limit groove 26, thereby completing the fixation of the rotating rod 27.

[0040] See also Figure 6 A second return spring 21 is sleeved on one side of the outside of the second guide rod 20, one end of the second return spring 21 is connected to the connecting block 22, and the other end of the second return spring 21 is connected to the second transmission chamber 15. When the first moving block 16 releases the limit on the second moving block 17, the elastic action of the second return spring 21 can make the limit block 25 lead out of the inside of the limit groove 26, so as to facilitate the release of the fixation of the rotating rod 27.

[0041] See also Figure 3 and Figure 6 , an annular pull block 23 is provided on the inner side of the replacement seat 14, and the annular pull block 23 is fitted with the replacement seat 14, and a connecting rod 24 is adhered and fixed at the middle position of the inner side of the first movable block 16, one end of the connecting rod 24 passes through and extends to the outside of the second transmission cavity 15, and the end of the connecting rod 24 located outside the second transmission cavity 15 is adhered and fixed to the annular pull block 23. Through the design of the annular pull block 23 and the connecting rod 24, the operator can easily pull the annular pull block 23 to operate the first movable block 16, and then control the unlocking and release of the cleaning mechanism, thereby improving the operability of the equipment and user experience.

[0042] See also Figure 6The upper and lower sides of one end of the rotating rod 27 located inside the replacement seat 14 are provided with limiting grooves 26, one end of the second movable block 17 is adhered and fixed to the limiting block 25, one end of the limiting block 25 passes through and extends to the outside of the second transmission cavity 15, and the end of the limiting block 25 located outside the second transmission cavity 15 is adapted to the limiting groove 26. The cooperation of the limiting groove 26 and the limiting block 25 realizes the locking and unlocking function of the rotating rod 27, ensuring the stability of the rotating rod 27 during normal operation. At the same time, the rotating rod 27 and the winding rod 28 thereon can be easily unlocked and removed when cleaning is required.

[0043] See also Figure 4 Two first bearings 8 are provided on the outside of the first transmission rod 7, the outer walls of the first bearings 8 are connected to the first transmission cavity 4, and the inner walls of the first bearings 8 are connected to the outer walls of the first transmission rod 7. The first bearings 8 can reduce the friction and wear of the first transmission rod 7 during rotation, improve the transmission efficiency and service life, and maintain the stability and accuracy of the transmission system.

[0044] See also Figure 2 Two second bearings 11 are provided on the outside of the second transmission rod 10, the outer walls of the second bearings 11 are connected to the first transmission cavity 4, and the inner walls of the second bearings 11 are connected to the outer walls of the second transmission rod 10. The second bearings 11 can reduce the friction and wear of the second transmission rod 10 during rotation, improve the transmission efficiency and service life, and ensure the smooth operation of the transmission system.

[0045] Working principle: When in use, the permanent magnet axial flow pump 1 is supported by the support legs 29 and the support blocks 30, and the extension block 31 is rotated by the damping shaft. The angle of the extension block 31 can be adjusted to adapt to the uneven placement surface, and the anti-skid pad at the lower end of the extension block 31 can increase the friction force and improve the stability during placement. When the permanent magnet motor 2 is started, the drive shaft 3 will drive the impeller to rotate and inhale the water flow. The drive shaft 3 will drive the first bevel gear 5 to rotate. Since the first bevel gear 5 is meshed and connected with the four second bevel gears 6, it will drive the second bevel gear 6 to make the first transmission rod 7 rotate synchronously. The setting of the bearing 8 ensures the smooth rotation of the first transmission rod 7. When the first transmission rod 7 rotates, it will drive one of the third bevel gears 9 to rotate. Since the third bevel gear 9 is meshed with another third bevel gear 9, the other third bevel gear 9 will rotate synchronously, thereby driving the second transmission rod 10 to rotate synchronously. The second bearing 11 ensures the smooth rotation of the second transmission rod 10. The rotation of the second transmission rod 10 will drive one of the fourth bevel gears 12. The meshing connection between the fourth bevel gear 12 and the other fourth bevel gear 12 will cause the third transmission rod 13 to rotate, and the third transmission rod 13 will The replacement seat 14 is driven to rotate the rotating rod 27 synchronously, and the rotation of the rotating rod 27 will drive the multiple winding rods 28 to rotate synchronously. Before the flocculent debris enters the permanent magnetic axial flow pump 1, the rotating winding rod 28 can be used to wind up the flocculent debris, so that the flocculent debris is attached to the winding rod 28 after being wound, thereby effectively preventing these debris from entering the interior of the permanent magnetic axial flow pump 1, avoiding the entanglement and clogging of the impeller and other components in the pump. When cleaning the flocculent debris, the annular pull block 23 is pulled, and the first moving block 16 is synchronously moved under the connection of the connecting rod 24, and the movement of the first moving block 16 causes the first reset spring 19 The second movable block 17 will be compressed and the extrusion limit on the second movable block 17 will be released. At this time, under the pull of the second return spring 21, the second movable block 17 will drive the limit block 25 to move into the second transmission chamber 15. After the limit block 25 moves out from the inside of the limit groove 26, the limit on the rotating rod 27 will be released. By pulling the rotating rod 27, it can be taken out from the lower end of the permanent magnet axial flow pump 1 together with the winding rod 28, which is convenient for cleaning. When installing, you only need to pull the annular pull block 23 again to insert the rotating rod 27 into the replacement seat 14. There is no need for long-term shutdown or complicated disassembly steps, which ensures the continuous and efficient operation of the permanent magnet axial flow pump 1.

[0046] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A permanent magnet axial flow pump for municipal engineering, comprising a permanent magnet axial flow pump (1), a permanent magnet motor (2) is arranged on the upper side of the permanent magnet axial flow pump (1), a driving shaft (3) is arranged at the output end of the permanent magnet motor (2) through a coupling, and four support legs (29) are arranged on the upper side of the permanent magnet axial flow pump (1) and are equidistantly distributed in a ring shape, characterized in that: It also includes a first transmission cavity (4), which is opened inside the supporting leg (29), a first transmission rod (7) is rotatably arranged on the upper side of the first transmission cavity (4), a second transmission rod (10) is arranged at a middle position inside the first transmission cavity (4), and a third transmission rod (13) is rotatably arranged on the lower side of the first transmission cavity (4), and one end of the third transmission rod (13) extends to the outside of the first transmission cavity (4); The invention also comprises a replacement seat (14), which is arranged outside the first transmission cavity (4) when the third transmission rod (13) is located, and the replacement seat (14) is fixedly connected to the third transmission rod (13); a rotating rod (27) is arranged inside the replacement seat (14); the rotating rod (27) is slidably matched with the replacement seat (14), and one end of the rotating rod (27) extends to the outside of the replacement seat (14); the outer wall of the rotating rod (27) located at one end outside the replacement seat (14) is welded with four groups of winding rods (28) distributed in an annular manner and at equal intervals, and each group of winding rods (28) is welded with five winding rods distributed in an equal intervals; the upper and lower sides of the replacement seat (14) are both provided with a second transmission cavity (15); the second transmission cavity (15) is provided inside the replacement seat (14); A first moving block (16) is arranged inside each cavity (15), a second moving block (17) is arranged on one side of each first moving block (16), a first guide rod (18) is welded inside each second transmission cavity (15), a second guide rod (20) is welded on one side of each second transmission cavity (15), the first moving block (16) and the first guide rod (18) and the second moving block (17) and the second guide rod (20) are connected via a connecting block (22), the connecting block (22) is penetrated by the first guide rod (18) and the second guide rod (20), and the connecting block (22) is slidably matched with the first guide rod (18) and the second guide rod (20); It also includes a support block (30) which is arranged at the lower end of the support leg (29), three extension blocks (31) are arranged inside the support block (30), and the extension blocks (31) are connected to the support block (30) through a damping device.

2. A permanent magnet axial flow pump for municipal engineering according to claim 1, characterized in that: A first bevel gear (5) is arranged on the upper side of the outer wall of the driving shaft (3), a second bevel gear (6) is arranged at one end of each of the first transmission rods (7), and the second bevel gear (6) is meshingly connected with the first bevel gear (5).

3. A permanent magnet axial flow pump for municipal engineering according to claim 2, characterized in that: A third bevel gear (9) is provided on one side of the outer wall of the first transmission rod (7) and on the upper end of the second transmission rod (10), and the third bevel gears (9) are meshingly connected.

4. A permanent magnet axial flow pump for municipal engineering according to claim 3, characterized in that: The lower end of the second transmission rod (10) and the outer wall of one end of the third transmission rod (13) located inside the first transmission chamber (4) are both provided with fourth bevel gears (12), and the fourth bevel gears (12) are meshingly connected.

5. A permanent magnet axial flow pump for municipal engineering according to claim 1, characterized in that: A first return spring (19) is sleeved on one side of the outside of the first guide rod (18), one end of the first return spring (19) is connected to the first moving block (16), and the other end of the first return spring (19) is connected to the second transmission chamber (15).

6. A permanent magnet axial flow pump for municipal engineering according to claim 5, characterized in that: A second return spring (21) is sleeved on one side of the exterior of the second guide rod (20), one end of the second return spring (21) is connected to the connecting block (22), and the other end of the second return spring (21) is connected to the second transmission chamber (15).

7. A permanent magnet axial flow pump for municipal engineering according to claim 1, characterized in that: An annular pull block (23) is arranged on the inner side of the replacement seat (14), and the annular pull block (23) is fitted with the replacement seat (14); a connecting rod (24) is bonded and fixed at the middle position of the inner side of the first moving block (16); one end of the connecting rod (24) passes through and extends to the outside of the second transmission cavity (15); and the end of the connecting rod (24) located outside the second transmission cavity (15) is bonded and fixed to the annular pull block (23).

8. A permanent magnet axial flow pump for municipal engineering according to claim 1, characterized in that: The upper and lower sides of one end of the rotating rod (27) located inside the replacement seat (14) are provided with limiting grooves (26); one end of the second movable block (17) is adhered and fixed to the limiting block (25); one end of the limiting block (25) passes through and extends to the outside of the second transmission cavity (15); and one end of the limiting block (25) located outside the second transmission cavity (15) is matched with the limiting groove (26).

9. A permanent magnet axial flow pump for municipal engineering according to claim 1, characterized in that: Two first bearings (8) are arranged outside the first transmission rod (7), the outer walls of the first bearings (8) are connected to the first transmission cavity (4), and the inner walls of the first bearings (8) are connected to the outer wall of the first transmission rod (7).

10. A permanent magnet axial flow pump for municipal engineering according to claim 1, characterized in that: Two second bearings (11) are arranged outside the second transmission rod (10), the outer walls of the second bearings (11) are connected to the first transmission cavity (4), and the inner walls of the second bearings (11) are connected to the outer wall of the second transmission rod (10).

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