Self-priming pump

Abstract

The invention discloses a self-priming pump which comprises a pump shell, an impeller and a driving motor. The pump shell is provided with a cavity and a suction flow channel located in the cavity, a driving cavity is formed in the outer wall face of the pump shell and faces the interior of the cavity in a concave mode, the cavity, the driving cavity and the suction flow channel are sequentially communicated, the cavity and the suction flow channel are each provided with a communication opening communicated with the outside, and the side, away from the cavity, of the driving cavity is open. The impeller is rotationally arranged in the driving cavity around the axial direction of the impeller and can drive fluid to sequentially flow through the suction flow channel, the driving cavity and the cavity during rotation; a shell of the driving motor covers the opening of the driving cavity, and a rotating shaft of the driving motor extends into the driving cavity from the interior of the shell, is connected to the impeller and is used for driving the impeller to rotate in the axial direction of the driving motor. According to the scheme, a coupler is not needed for transmission, vibration abnormal sound caused by misalignment of a shaft system is avoided, meanwhile, the overall structure of the self-priming pump is more compact, the size and weight of the self-priming pump are reduced, the space occupied by the overall structure is reduced, installation in narrow space areas such as a marine engine room is facilitated, and practicability is improved.

Description

Technical Field

[0001] The invention relates to the technical field of self-priming pumps, and in particular to a self-priming pump. Background Art

[0002] Centrifugal pumps are important fluid conveying equipment in the fields of ships, industry and agriculture. Traditional self-priming centrifugal pumps generally work by using a motor outside the pump body to drive the impeller inside the pump. For example, patent CN 211174639 U discloses a self-priming pump, which includes a motor and a pump body, the output shaft of the motor and the impeller shaft of the pump body are connected by a coupling, and fixed grooves are evenly distributed on the half couplings between the motor and the pump body. The two half couplings are locked and connected by a concave locking block, which is easy to disassemble and assemble, and the connection is firm.

[0003] However, the impeller is inside the pump body and the motor is outside the pump body, and the two are connected by a coupling. If the shaft system is not well aligned, it is easy to induce mechanical vibration noise. In addition, the pump body, drive shaft and motor are coaxially installed on the same base, resulting in a large axial size and heavy weight, which is not conducive to installation, use and maintenance in small areas such as ship cabins. Summary of the invention

[0004] The purpose of the present invention is to overcome the above technical deficiencies and propose a self-priming pump to solve the technical problems in the prior art that the self-priming centrifugal pump is connected to the motor and the impeller through a coupling, has a large volume and weight, and is prone to abnormal vibration due to poor shaft alignment.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides a self-priming pump, comprising: The pump housing has a cavity and a suction flow channel in the cavity, and a driving cavity is concavely arranged on the outer wall thereof toward the cavity, the cavity, the driving cavity and the suction flow channel are sequentially connected, and the cavity and the suction flow channel are respectively provided with a communication port connected to the outside, and the driving cavity is opened on one side away from the cavity; an impeller, which is rotatable about its axial direction and is disposed in the driving chamber, and can drive the fluid to flow through the suction flow channel, the driving chamber and the chamber body in sequence when rotating; and The driving motor has a casing cover disposed at the opening of the driving cavity, and a rotating shaft extending from the casing into the driving cavity and connected to the impeller to drive the impeller to rotate around its axial direction.

[0006] In some embodiments, the drive motor further includes a rotor and two sets of stators. The rotor is located in the housing and is sleeved on the outer circumference of the rotating shaft. The two sets of stators are installed on the inner wall of the housing and are located on both sides of the rotor in the axial direction.

[0007] In some embodiments, the housing is provided with stator cavities at both ends in the axial direction, and an annular partition is provided on the inner wall of each stator cavity close to one end of the rotating shaft extending toward the other stator cavity, and two groups of stators are respectively arranged in the two groups of stator cavities, and the rotor is located between the two annular partitions and has a gap reserved with each stator; The drive motor also includes two groups of bearings and two groups of stator sealing cover plates. The two groups of bearings are respectively arranged between the two annular partitions and the rotating shaft. The two groups of stator sealing cover plates are respectively covered on one end of the two annular partitions close to the other annular partition.

[0008] In some embodiments, the rotating shaft and the housing are spaced apart from the side wall of the cavity to form a flow gap, and a return channel is provided along its axial direction, and the return channel connects the flow gap and the driving cavity.

[0009] In some embodiments, a transparent window is provided on a side of the flow gap away from the cavity, and the transparent window is opposite to the rotating shaft.

[0010] In some embodiments, the rotor comprises a support ring, two groups of permanent magnets, two groups of rotor cores and two rotor sealing cover plates, the support ring is sleeved on the outer periphery of the rotating shaft and is located between the two annular partitions, and mounting grooves are respectively recessed on both sides of the support ring in the axial direction, the two groups of permanent magnets and the two groups of rotor cores are respectively arranged in the two mounting grooves, and the two rotor sealing plate covers are arranged at the openings of the two mounting grooves; and / or, The stator cavity is filled with heat-conducting sealant.

[0011] In some embodiments, the impeller includes a mounting sleeve, a first wheel plate and a plurality of blades, the mounting sleeve is provided with a second wheel plate extending radially thereof, the first wheel plate is spaced apart at one side of the second wheel plate and is provided with a suction port, and the plurality of blades are provided between the first wheel plate and the second wheel plate; One end of the rotating shaft extending into the driving cavity extends from the mounting sleeve into the suction port, and a step surface is provided on the side of the mounting sleeve close to the housing, wherein the connecting part between the driving cavity and the suction flow channel is located in the axial direction of the rotating shaft, and the connecting part between the driving cavity and the cavity is located on one side in the radial direction of the first wheel plate; The self-priming pump further comprises a flow guide cap, which is sleeved on one end of the rotating shaft extending into the suction port.

[0012] In some embodiments, a sealing boss is protruding from one end of the first wheel plate away from the mounting sleeve, and the self-priming pump further comprises a first static sealing ring and a first dynamic sealing ring, wherein the first static sealing ring is disposed on the inner wall of the driving cavity and is located at the connection point between the driving cavity and the suction channel, and the first dynamic sealing ring is sleeved outside the sealing boss and corresponds to the first static sealing ring.

[0013] In some embodiments, the self-priming pump also includes a second static sealing ring and a second dynamic sealing ring, the second static sealing ring is installed on a side of the casing close to the driving chamber, and a spacer ring is arranged on the outer periphery of the mounting sleeve, the second dynamic sealing ring is sleeved on the mounting sleeve and corresponds to the second static sealing ring.

[0014] In some embodiments, the communication port between the suction flow channel and the outside is located above the impeller and below the communication port between the cavity and the outside.

[0015] Compared with the prior art, in the self-priming pump provided by the present invention, the outer wall of the pump housing is concave toward the cavity to form a driving cavity, and the impeller is placed in the driving cavity, and at the same time, the housing of the driving motor is directly covered at the opening of the driving cavity, so that the rotating shaft of the driving motor can be directly connected to the impeller, so that the rotating shaft of the driving motor can drive the external fluid to enter the suction channel from the connecting port of the suction channel when rotating, and then pass through the driving cavity and the cavity in turn, and finally be discharged from the connecting port of the cavity to realize fluid transportation. Therefore, this scheme integrates the pump housing and the housing together, and does not require a coupling for transmission, avoiding vibration and abnormal sound caused by misalignment of the shaft system, and at the same time makes the overall structure of the self-priming pump more compact, reduces the volume and weight of the self-priming pump, and reduces the space occupied by the overall structure, which is conducive to installation in small areas such as ship cabins and improves practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a self-priming pump provided in an embodiment of the present invention; Figure 2 yes Figure 1 A cross-sectional view of a self-priming pump; Figure 3 yes Figure 2 A cross-sectional view of the drive motor and impeller; Figure 4 yes Figure 1 Schematic diagram of the middle pump housing; Figure 5 yes Figure 4 The cross-sectional view of the middle pump housing corresponding to the liquid outlet; Figure 6 yes Figure 3 A partial schematic diagram of the middle drive motor; Figure 7 yes Figure 3A cross-sectional view of the middle casing; Figure 8 yes Figure 3 The enlarged schematic diagram of point A in the middle; Fig. 9 yes Figure 3 A cross-sectional view of the middle drive motor; Fig.10 yes Figure 3 Cross-sectional view of the middle impeller; Fig.11 yes Figure 2 Schematic diagram of the rotating shaft; Fig.12 yes Fig. 9 Schematic diagram of the middle support ring; Fig.13 yes Fig.12 Cross-sectional view of the middle support ring.

[0017] Description of reference numerals: 1. Pump casing; 1a. Cavity; 1a1. Liquid outlet; 1a2. Waste outlet; 1b. Suction channel; 1b1. Liquid inlet; 1c. Drive chamber; 1c1. Waste outlet; 1d. Communication port; 1d1. Pump inlet; 1d2. Pump outlet; 2. Impeller; 21. Mounting sleeve; 211. Second wheel plate; 22. First wheel plate; 22a. Suction port; 221. Sealing boss; 23. Blade; 3. Drive motor; 31. Casing; 31a. Stator chamber; 31b. Flow clearance; 31c. Wiring hole; 311. Annular spacer Plate; 312, stator housing; 313, end cover; 32, rotating shaft; 32a, return channel; 321, step surface; 33, rotor; 331, support ring; 331a, mounting groove; 332, permanent magnet; 333, rotor core; 334, rotor sealing cover plate; 34, stator; 341, stator core; 342, winding; 35, bearing; 36, stator sealing cover plate; 37, transparent window; 4, guide cap; 5, first sealing static ring; 51, first sealing dynamic ring; 6, second sealing static ring; 61, second sealing dynamic ring. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] In order to solve the technical problems that a self-priming centrifugal pump is connected to a motor and an impeller through a coupling, which has a large volume and weight and is prone to abnormal vibration due to poor shaft alignment, the present invention provides a self-priming pump, which can avoid vibration and abnormal noise caused by shaft misalignment, and at the same time make the overall structure of the self-priming pump more compact, reduce the volume and weight of the self-priming pump, and reduce the space occupied by the overall structure, which is conducive to installation in small areas such as ship cabins and improves practicality.

[0020] See also Figure 1 and Figure 2 , Figure 1 and Figure 2 It is a structural schematic diagram of a self-priming pump in an embodiment of the present invention, the self-priming pump comprises a pump casing 1, an impeller 2 and a driving motor 3; the pump casing 1 has a cavity 1a and a suction channel 1b located in the cavity 1a, and a driving cavity 1c is recessed in its outer wall surface facing the cavity 1a, the cavity 1a, the driving cavity 1c and the suction channel 1b are connected in sequence, and the cavity 1a and the suction channel 1b are respectively provided with a connecting port 1d connected to the outside, and the driving cavity 1c is opened on one side away from the cavity 1a; the impeller 2 is arranged in the driving cavity 1c to rotate around its axial direction, and can drive the fluid to flow through the suction channel 1b, the driving cavity 1c and the cavity 1a in sequence when rotating; the casing 31 of the driving motor 3 is covered with the opening of the driving cavity 1c, and its rotating shaft 32 extends from the casing 31 into the driving cavity 1c, and is connected to the impeller 2, for driving the impeller 2 to rotate around its axial direction.

[0021] In the self-priming pump provided by the present invention, the outer wall of the pump housing 1 is concave toward the cavity 1a thereof to form a driving cavity 1c, and the impeller 2 is placed in the driving cavity 1c, and the housing 31 of the driving motor 3 is directly covered at the opening of the driving cavity 1c, so that the rotating shaft 32 of the driving motor 3 can be directly connected to the impeller 2, so that the rotating shaft 32 of the driving motor 3 can drive the external fluid to enter the suction channel 1b from the connecting port 1d of the suction channel 1b when rotating, and then pass through the driving cavity 1c and the cavity 1a in turn, and finally be discharged from the connecting port 1d of the cavity 1a to realize fluid transportation. Therefore, this scheme integrates the pump housing 1 and the housing 31 together, and does not require a coupling for transmission, thereby avoiding vibration and abnormal sound caused by misalignment of the shaft system, and at the same time making the overall structure of the self-priming pump more compact, reducing the volume and weight of the self-priming pump, reducing the space occupied by the overall structure, facilitating installation in small space areas such as ship cabins, and improving practicality. It should be noted that the casing 31 and the pump casing 1 are connected by bolts and are provided with a sealing ring.

[0022] In one embodiment, see Figure 3 The driving motor 3 further includes a rotor 33 and two sets of stators 34 . The rotor 33 is located in the housing 31 and is sleeved on the outer periphery of the rotating shaft 32 . The two sets of stators 34 are installed on the inner wall of the housing 31 and are located on both sides of the rotor 33 in the axial direction.

[0023] In this embodiment, the stator 34 and the rotor 33 are arranged along the axial direction of the rotating shaft 32. Specifically, a stator 34 is arranged on both sides of the axial direction of the rotor 33, which ensures the rotation stability of the rotor 33 and improves the compactness of the overall structure. It should be noted that in this solution, each stator 34 includes a stator core 341 and a winding 342.

[0024] In one embodiment, see Figures 6 to 8 The housing 31 is provided with stator cavities 31a at both ends in the axial direction thereof, and an annular partition plate 311 is provided on the inner wall of each stator cavity 31a near one end of the rotating shaft 32 extending toward the other stator cavity 31a, and two groups of stators 34 are respectively arranged in the two groups of stator cavities 31a, and the rotor 33 is located between the two annular partition plates 311, and a gap is reserved with each stator 34; the driving motor 3 also includes two groups of bearings 35 and two groups of stator sealing cover plates 36, the two groups of bearings 35 are respectively arranged between the two annular partition plates 311 and the rotating shaft 32, and the two groups of stator sealing cover plates 36 are respectively covered on one end of the two annular partition plates 311 near the other annular partition plate 311.

[0025] In this embodiment, please refer to Figure 3 , the stator 34 is sealed in the stator cavity 31a through the annular partition 311 and the stator sealing cover plate 36 to prevent the fluid from eroding the stator 34 and extend the service life of the stator 34. At the same time, a gap is reserved between the stator 34 and the rotor 33, so that the fluid in the driving cavity 1c can flow to the side of the rotating shaft 32 away from the cavity 1a through the gap between the inner and outer rings of the bearing 35 and the gap between the stator 34 and the rotor 33 in sequence, that is, enter the right side space of the rotating shaft 32, to achieve cooling of the motor and lubrication of the bearing 35. It should be noted that the gap reserved between the rotor 33 and the stator 34 is the air gap between the stator and rotor 33 of the axial flux motor. The greater the power, the larger the air gap, which is usually 0.5 to 5 mm. In addition, a temperature sensor is provided in the stator cavity 31a to monitor the temperature of the winding 342.

[0026] In one embodiment, see Figure 6 and Figure 7 The rotating shaft 32 is spaced apart from the side wall of the housing 31 away from the cavity 1a to form a flow gap 31b, and a return channel 32a is provided along its axial direction, and the return channel 32a connects the flow gap 31b and the driving cavity 1c.

[0027] In this embodiment, the fluid can flow through the drive chamber 1c, the left bearing 35, the gap between the left stator 34 and the rotor 33, the right bearing 35, the gap between the right stator 34 and the rotor 33, and finally enter the flow gap 31b on the right side of the rotating shaft 32, and then flow back to the drive chamber 1c from the return channel 32a of the rotating shaft 32. In this way, the fluid circulates on both sides of the rotating shaft 32, further improving the cooling and lubrication of the motor and the bearing 35.

[0028] In one embodiment, see Fig. 9 A transparent window 37 is provided on the side of the flow gap 31 b away from the cavity 1 a , and the transparent window 37 is opposite to the rotating shaft 32 .

[0029] In this embodiment, whether the turning and return channels 32a of the rotating shaft 32 are dirty or blocked can be observed through the transparent window 37. In addition, in one embodiment, a pressure sensor and a temperature sensor can be arranged in the flow gap 31b to monitor the fluid pressure and temperature of the right chamber of the rotating shaft 32.

[0030] In one embodiment, see Fig.12 and Fig.13 The rotor 33 includes a support ring 331, two groups of permanent magnets 332, two groups of rotor cores 333 and two rotor sealing cover plates 334. The support ring 331 is sleeved on the outer periphery of the rotating shaft 32 and is located between the two annular partitions 311, and mounting grooves 331a are respectively recessed on both sides of the support ring 331 in the axial direction. The two groups of permanent magnets 332 and the two groups of rotor cores 333 are respectively arranged in the two mounting grooves 331a, and the two rotor 33 sealing plate covers are arranged at the openings of the two mounting grooves 331a.

[0031] In this embodiment, the rotor 33 is provided in the form of a support ring 331, and mounting grooves 331a are provided on both sides of the support ring 331 for the permanent magnet 332 and the iron core of the rotor 33 to be installed. In this way, while ensuring that the rotor 33 can stably drive the rotating shaft 32 to rotate, the structure of the rotor 33 is relatively compact. In addition, the permanent magnet 332 and the iron core of the rotor 33 can be sealed in the mounting groove 331a by the sealing plate of the rotor 33, thereby extending the service life.

[0032] In addition, in one embodiment, the stator cavity 31a is filled with thermally conductive sealant. Specifically, each stator cavity 31a is provided with a wiring hole 31c connected to the outside. After the stator 34 is assembled, the thermally conductive sealant can be filled into the corresponding stator cavity 31a through the wiring hole 31c to ensure the heat dissipation and sealing performance of the winding 342.

[0033] In one embodiment, see Fig.10 and Fig.11The impeller 2 includes a mounting sleeve 21, a first wheel plate 22 and a plurality of blades 23. The mounting sleeve 21 is provided with a second wheel plate 211 extending radially thereof. The first wheel plate 22 is spaced apart at one side of the second wheel plate 211 and is provided with a suction port 22a. The plurality of blades 23 are provided between the first wheel plate 22 and the second wheel plate 211. One end of the rotating shaft 32 extending into the driving chamber 1c extends into the suction port 22a from the mounting sleeve 21, and a step surface 321 is provided on the side of the mounting sleeve 21 close to the casing 31, wherein the connecting portion between the driving chamber 1c and the suction flow channel 1b is located in the axial direction of the rotating shaft 32, and the connecting portion between the driving chamber 1c and the cavity 1a is located on one side of the radial direction of the first wheel plate 22. The self-priming pump also includes a guide cap 4, which is sleeved on one end of the rotating shaft 32 extending into the suction port 22a.

[0034] In this embodiment, the impeller 2 is locked on the rotating shaft 32 by the guide cap 4, and when the impeller 2 rotates, the fluid enters the suction port 22a from the suction channel 1b, and then is driven by the blades 23 between the two wheel plates to be transported to the cavity 1a. Figure 4 In this solution, the connection point between the suction channel 1b and the driving chamber 1c is defined as the liquid inlet 1b1, and the connection point between the driving chamber 1c and the cavity 1a is defined as the liquid outlet 1a1. In addition, the connection port 1d connecting the suction channel 1b with the outside is defined as the pump body inlet 1d1, and the connection port 1d connecting the cavity 1a with the outside is defined as the pump body outlet 1d2.

[0035] In addition, it should be noted that, in one embodiment, the guide cap 4 is threadedly connected to the rotating shaft 32 and is further locked by a pin hole and a pin. Furthermore, based on the above embodiment of the return channel 32a, a hole is also provided on the guide cap 4 to facilitate return flow.

[0036] In one of the embodiments, a sealing boss 221 is protruding from one end of the first wheel plate 22 away from the mounting sleeve 21, and the self-priming pump also includes a first sealing static ring 5 and a first sealing dynamic ring 51. The first sealing static ring 5 is arranged on the inner wall of the driving chamber 1c and is located at the connection point between the driving chamber 1c and the suction channel 1b. The first sealing dynamic ring 51 is sleeved on the outside of the sealing boss 221 and corresponds to the first sealing static ring 5.

[0037] In this embodiment, a dynamic seal ring and a static seal ring are arranged at the interface between the sealing boss 221 and the suction channel 1b to prevent the fluid from entering the driving chamber 1c without passing through the suction port 22a, that is, to ensure that the fluid can enter between the two wheel plates from the suction channel 1b through the suction port 22a, so that it can be effectively driven by the blades 23 to enter the cavity 1a from the liquid outlet 1a1, and finally discharged from the pump body outlet 1d2, thereby improving the output head. It should be noted that the radial clearance between the first static seal ring 5 and the first dynamic seal ring 51 is controlled at 0.1 mm to 0.2 mm.

[0038] In one embodiment, the self-priming pump further includes a second static sealing ring 6 and a second dynamic sealing ring 61. The second static sealing ring 6 is installed on a side of the housing 31 close to the driving chamber 1c, and a spacer ring is arranged on the outer periphery of the mounting sleeve 21. The second dynamic sealing ring 61 is sleeved on the mounting sleeve 21 and corresponds to the second static sealing ring 6.

[0039] In this embodiment, a dynamic seal ring and a static seal ring are further provided between the mounting sleeve 21 and the housing 31 to control the fluid to enter the housing 31 from the gap between the rotating shaft 32 and the housing 31. Specifically, in this embodiment, based on the embodiment of the reflux channel 32a, there is a gap between the second static seal ring 6 and the second dynamic seal ring 61 in the radial direction, and the radial gap is controlled to be 0.2 mm to 0.4 mm, so that the fluid can pass through the radial gap between the second static seal ring 6 and the second dynamic seal ring 61.

[0040] In one embodiment, the communication port 1d between the suction flow passage 1b and the outside is located above the impeller 2 and below the communication port 1d between the cavity 1a and the outside.

[0041] In this embodiment, the pump body inlet 1d1 is arranged above the impeller 2, and the pump body outlet 1d2 is arranged above the pump body inlet 1d1, which can ensure that the impeller 2 is immersed in the pumped liquid every time the pump is shut down, and ensure that the pump can effectively self-prime when it is started next time. It should be noted that the liquid outlet 1a1 is arranged at the upper end of the drive chamber 1c and corresponds to the pump body outlet 1d2. In addition, a waste liquid port 1c1 is also provided at the bottom of the drive chamber 1c, and the waste liquid port 1c1 is connected to the bottom of the cavity 1a, and the bottom of the cavity 1a also has a waste outlet 1a2 connected to the outside, and the waste outlet 1a2 is provided with a waste valve for regular cleaning.

[0042] In addition, it should be noted that, in one embodiment, the casing 31 is composed of two stator shells 312 and an end cover 313. The two stator shells 312 together enclose a cavity. The end cover 313 is arranged at the end of the stator shell 312 away from the cavity 1a, and is provided with a transparent window 37. Each connection is connected by bolts, and corresponding sealing rings are arranged.

[0043] In order to better understand the present invention, the following Figures 1 to 13 The technical solution of the present invention is described in detail: In this embodiment, when the pump unit is manufactured and assembled, the above-mentioned components should be manufactured first, and the stator 34 component and the rotor 33 component of the drive motor 3 should be assembled in place, and then the drive system and the impeller 2 should be installed in place and locked, and finally the whole should be installed in the drive chamber 1c of the pump housing 1.

[0044] For the motor, the stator core 341 and winding 342 of the drive motor 3, the coil of the winding 342 thereon, and the position and temperature sensors should be installed in the stator cavity 31a of the drive motor 3, and the stator sealing cover plate 36 should be installed to the end face of the corresponding annular partition 311 by welding or other means, and at the same time, the stator sealing cover plate 36 should be ensured to be close to the surface of the stator core 341 and the winding 342. By adopting this packaging process, it can be ensured that the winding 342 is isolated from the external pumping liquid while the motor stator 34 is cooled by pumping liquid. After the installation is completed, the high thermal conductivity sealant is poured through the wiring hole 31c to fill the space in the stator cavity 31a except the stator core 341 and the winding 342.

[0045] For the rotor 33 assembly of the drive motor 3, the rotor core 333 of the drive motor 3 is first installed on both sides of the support ring 331, keeping the three coaxial; then the permanent magnet 332 is installed on the outer surface of the rotor core 333, and the rotor sealing cover plate 334 is welded or installed on the installation groove 331a port of the support ring 331 by other solutions, completing the packaging of the rotor core 333 and the magnet. After the packaging is completed, the internal glue of the rotor 33 cavity 1a is injected through the relevant reserved holes on the support ring 331 and the injection holes are blocked to complete the production of the rotor 33 assembly of the drive motor 3.

[0046] During assembly, first complete the assembly of the drive system and impeller 2. The specific steps are as follows: (1) Install the rotor 33 assembly of the drive motor 3 on the rotating shaft 32 and tighten it with a pressure cap; (2) Install the bearing 35 in the inner hole seat of the annular partition 311, insert the rotating shaft 32 into the inner hole of the bearing 35 from the left, and install it in place; (3) Install another bearing 35 on the right side of the rotating shaft 32, and install another pressure cap to the corresponding seat hole and lock it. At this point, the installation of the stator and rotor 33 assembly of the drive motor 3 is completed. (4) Install the second sealing static ring 6 and the second sealing dynamic ring 61 to the corresponding inner holes of the casing 31, and install the first sealing dynamic ring 51 to the sealing boss 221 of the impeller 2; (5) Install the impeller 2 on the transmission shaft and lock it with the guide cap 4. At this point, the assembly of the drive system and impeller 2 is completed. (6) Install the first sealing static ring 5 to the suction channel 1b near the liquid inlet 1b1, and install the assembled drive system and impeller 2 as a whole into the drive chamber 1c of the pump body; (7) Install the transparent window 37 to the end cover 313 and press it with a gland, and install the end cover 313 to the stator housing 312 of the drive motor 3. The installation of the entire pump is now completed.

[0047] When working, first fill the pump body with the pumped liquid, immerse the entire impeller 2, start the pump group, and then the liquid can be sucked and discharged. By adjusting the frequency of the input voltage, the speed, flow rate and head of the pump group can be adjusted. Under the action of pressure, the liquid on the left side of the impeller 2 flows through the radial gap between the second sealing dynamic ring 61 and the second sealing static ring 6, the bearing 35, the air gap between the stator sealing cover plate 36 and the rotor sealing cover plate 334, enters the space on the right side of the rotating shaft 32, and enters the suction port 22a of the impeller 2 through the reflux channel 32a on the axis of the rotating shaft 32 and the hole on the guide cap 4, so as to cool the motor and lubricate the bearing 35. Through the transparent window 37, it is possible to observe the direction of the rotating shaft and whether the reflux channel 32a is dirty or blocked. Pressure sensors and temperature sensors can also be installed on the end cover 313 to monitor the pressure and temperature of the liquid flowing through the right chamber of the transmission shaft.

[0048] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A self-priming pump, characterized in that: include: The pump housing has a cavity and a suction flow channel in the cavity, and a driving cavity is concavely arranged on the outer wall thereof toward the cavity, the cavity, the driving cavity and the suction flow channel are sequentially connected, and the cavity and the suction flow channel are respectively provided with a communication port connected to the outside, and the driving cavity is opened on one side away from the cavity; an impeller, which is rotatable about its axial direction and is disposed in the driving chamber, and can drive the fluid to flow through the suction flow channel, the driving chamber and the chamber body in sequence when rotating; and The driving motor has a casing cover disposed at the opening of the driving cavity, and a rotating shaft extending from the casing into the driving cavity and connected to the impeller to drive the impeller to rotate around its axial direction.

2. The self-priming pump according to claim 1, characterized in that: The driving motor further comprises a rotor and two groups of stators. The rotor is located in the housing and is sleeved on the outer circumference of the rotating shaft. The two groups of stators are installed on the inner wall of the housing and are located on both sides of the rotor in the axial direction.

3. The self-priming pump according to claim 2, characterized in that: The housing is provided with stator cavities at both ends in the axial direction, and an annular partition is provided on the inner wall of each stator cavity, which is close to one end of the rotating shaft and extends toward the other stator cavity. The two groups of stators are respectively arranged in the two groups of stator cavities, and the rotor is located between the two annular partitions and has a gap reserved with each stator; The drive motor also includes two groups of bearings and two groups of stator sealing cover plates. The two groups of bearings are respectively arranged between the two annular partitions and the rotating shaft. The two groups of stator sealing cover plates are respectively covered on one end of the two annular partitions close to the other annular partition.

4. The self-priming pump according to claim 3, characterized in that: The rotating shaft and the housing are spaced apart from the side wall of the cavity to form a flow gap, and a return channel is provided along the axial direction thereof, and the return channel communicates with the flow gap and the driving cavity.

5. The self-priming pump according to claim 4, characterized in that: A transparent window is provided on a side of the flow gap away from the cavity, and the transparent window is directly opposite to the rotating shaft.

6. The self-priming pump according to claim 3, characterized in that: The rotor comprises a support ring, two groups of permanent magnets, two groups of rotor cores and two rotor sealing cover plates, wherein the support ring is sleeved on the outer periphery of the rotating shaft and is located between the two annular partitions, and mounting grooves are respectively provided on two sides of the support ring in the axial direction, the two groups of permanent magnets and the two groups of rotor cores are respectively provided in the two mounting grooves, and the two rotor sealing plate covers are provided at the openings of the two mounting grooves; and / or, The stator cavity is filled with heat-conducting sealant.

7. The self-priming pump according to claim 1, characterized in that: The impeller comprises a mounting sleeve, a first wheel plate and a plurality of blades, wherein the mounting sleeve is provided with a second wheel plate extending radially thereof, the first wheel plate is spaced apart at one side of the second wheel plate and is provided with a suction port, and the plurality of blades are provided between the first wheel plate and the second wheel plate; One end of the rotating shaft extending into the driving cavity extends from the mounting sleeve into the suction port, and a step surface is provided on the side of the mounting sleeve close to the housing, wherein the connecting part between the driving cavity and the suction flow channel is located in the axial direction of the rotating shaft, and the connecting part between the driving cavity and the cavity is located on one side in the radial direction of the first wheel plate; The self-priming pump further comprises a flow guide cap, which is sleeved on one end of the rotating shaft extending into the suction port.

8. The self-priming pump according to claim 7, characterized in that: A sealing boss is convexly provided at one end of the first wheel plate away from the mounting sleeve. The self-priming pump also includes a first static sealing ring and a first dynamic sealing ring. The first static sealing ring is arranged on the inner wall of the driving cavity and is located at the connection point between the driving cavity and the suction flow channel. The first dynamic sealing ring is sleeved outside the sealing boss and corresponds to the first static sealing ring.

9. The self-priming pump according to claim 7, characterized in that: The self-priming pump also includes a second static sealing ring and a second dynamic sealing ring. The second static sealing ring is installed on a side of the housing close to the driving chamber, and a spacer ring is arranged on the outer periphery of the mounting sleeve. The second dynamic sealing ring is sleeved on the mounting sleeve and corresponds to the second static sealing ring.

10. The self-priming pump according to claim 1, characterized in that: The communication port between the suction flow channel and the outside is located above the impeller and below the communication port between the cavity and the outside.

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