High seal submersible motor

Abstract

The invention provides a high-sealing submersible motor, which belongs to the field of submersible motors, and comprises a coaxially arranged housing and a rotating shaft, end covers are arranged at both ends of the housing, a sand-slinging ring assembly is arranged between the end cover and the rotating shaft, a rotor and a stator are arranged inside the housing, the rotor is fixedly connected to the rotating shaft, a thrust assembly is arranged on the inner ring of the stator, the thrust assembly is coaxially arranged with the rotating shaft, the thrust assembly comprises a coaxial slide plate, a thrust bearing and a lower guide bearing, one end of the slide plate is contacted with the shoulder of the rotating shaft, the slide plate is fixed with the rotating shaft through a key, one end of the thrust bearing is contacted with the slide plate, and the other end is contacted with the lower guide bearing, one end of the lower guide bearing away from the thrust bearing is fixedly locked on the lower stop ring, the lower stop ring is fixedly arranged on the housing inner ring of the submersible motor, and the side of the lower stop ring that does not lock the lower guide bearing is contacted with the stator. The invention has high sealing performance and can effectively prevent fine sand particles from entering.

Description

Technical Field

[0001] The invention belongs to the field of submersible motors, and relates to submersible motors used in sewage treatment industry, and in particular to high-sealed submersible motors. Background Art

[0002] Submersible motors are used in combination with pumps, or pump components are directly installed on the shaft extension end of the submersible motor to form a product that combines a motor and a pump. They work in underground water or in rivers, lakes, oceans, and other places. They have the advantages of small size, light weight, no need to divert water before starting, no suction range restrictions, no need for a separate pump room, easy installation and use, reliable performance, high efficiency, low price, and investment savings. They are widely used in taking water from underground or rivers and lakes, agricultural irrigation, urban water supply, drainage of industrial and mining enterprises, drainage of urban and rural buildings, domestic water use, urban or factory sewage treatment, etc. The high-sealed submersible motors currently used often have problems such as poor sealing or unstable internal pressure, high failure rate, inconvenient maintenance, poor performance, and high overall cost. Summary of the invention

[0003] The problem to be solved by the present invention is to provide a highly sealed submersible motor with a simple structure, convenient adjustment, and good sealing performance, which can prevent fine sand in the water from entering the hollow motor, thereby improving the safety performance of the entire device and extending its service life.

[0004] To achieve the above object, the technical solution of the present invention is implemented as follows: a highly sealed submersible motor comprises a coaxially arranged housing and a rotating shaft, end covers are arranged at both ends of the housing, a sand throwing ring assembly is arranged between the end cover and the rotating shaft, a rotor and a stator are arranged inside the housing, the rotor is fixedly connected to the rotating shaft, a thrust assembly is arranged on the inner ring of the stator, and the thrust assembly is coaxially arranged with the rotating shaft;

[0005] The sand throwing ring assembly comprises a coaxially arranged sealing ring, a sealing seat and a sealing gasket, the sealing gasket is embedded in the end cover of the submersible motor and is locked with the end cover, the sealing seat is arranged on the side of the sealing gasket away from the end cover, the sealing ring is arranged on the side of the sealing seat away from the sealing gasket, the sealing ring comprises a sealing section and a matching section, the sealing section is fitted with the rotating shaft of the submersible motor, the matching section is arranged at one end close to the sealing seat, the sealing seat is T-shaped and one end is arranged on the inner ring of the matching section and is in contact with it, and the other end is extended outwardly to set a cover on the sealing gasket, and the sealing seat and the sealing gasket are locked on the end cover;

[0006] The thrust assembly includes a coaxial slide plate, a thrust bearing and a lower guide bearing, one end of the slide plate is contacted with the shoulder of the rotating shaft, the slide plate is fixed to the rotating shaft by a key, one end of the thrust bearing is contacted with the slide plate, and the other end is contacted with the lower guide bearing, one end of the lower guide bearing away from the thrust bearing is fixedly locked on the lower stop ring, the lower stop ring is fixedly arranged on the inner ring of the housing of the submersible motor, and the side of the lower stop ring that is not fixed with the lower guide bearing is contacted with the stator.

[0007] Furthermore, the sealing section includes a first fitting section, a transition section and a second fitting section which are sequentially arranged and connected, the first fitting section and the second fitting section correspond to different diameter positions of the rotating shaft, and the transition section is arranged corresponding to the chamfer of the rotating shaft.

[0008] Furthermore, the rotating shaft is connected to an external driving device via a coupling.

[0009] Furthermore, the sealing ring is arranged between the coupling and the sealing seat, the sealing ring is arranged in contact with the end face of the coupling, and an outward avoidance chamfer is provided at one end of the sealing ring close to the coupling, and the interior of the avoidance chamfer does not contact the rotating shaft.

[0010] Furthermore, the rotating shaft is connected to an external driving device via a coupling.

[0011] Furthermore, the sealing gasket is T-shaped and one end of the small head is embedded in the end cover.

[0012] Furthermore, the thickness of the fitting section is greater than the thickness of the sealing section.

[0013] Furthermore, the sealing ring is integrally formed from rubber material.

[0014] Furthermore, the end cover is provided with a connecting cable extending outward, and a sealing ring is provided between the connecting cable and the end cover.

[0015] Furthermore, the lower guide bearing is fixed to the lower stop ring by stud bolts, and the lower stop ring is welded to the inner ring of the housing as a whole.

[0016] Furthermore, a balancing ring is provided at one end of the rotor close to the stator. The balancing ring is arranged on the inner ring of the stator and is coaxial with the quasi-axis.

[0017] Furthermore, the balance ring is made of cast iron and is hot-casted as a whole with the rotating shaft.

[0018] Furthermore, the outer diameter of the balance ring is equal to the outer diameter of the slide plate.

[0019] Furthermore, the maximum outer diameter of the lower guide bearing is equal to the outer diameter of the thrust bearing, and the outer diameter of the thrust bearing is larger than the outer diameter of the slide plate.

[0020] Furthermore, the shell and the lower stop ring are made of stainless steel.

[0021] Compared with the prior art, the advantages and positive effects of the present invention are: 1. The present invention sequentially arranges a sealing ring, a sealing seat and a sealing gasket to achieve the sealing of the output end of the rotating shaft and the sealing of the end cover connection. The sealing gasket is embedded in the end cover, and the sealing seat is embedded in the matching section of the sealing ring. At the same time, the sealing seat and the sealing gasket are locked on the end seat and arranged layer by layer, which effectively prevents fine sand in the water from entering the hollow motor, thereby improving the safety performance of the entire device and extending the service life; 2. The first fitting section and the second fitting section correspond to different diameter positions of the rotating shaft, and the transition section corresponds to the chamfer of the rotating shaft and is set according to the shape of the rotating shaft to ensure close fitting at each stage and improve the sealing performance; 3. After setting the avoidance chamfer, it can avoid wear caused by direct contact with the thread, and secondly, the avoidance chamfer can Avoid the generation of vacuum during the installation of the coupling to ensure smooth installation; 4. The slide plate, thrust bearing and lower guide bearing are all set on the inner ring of the stator, and the thrust structure originally set at both ends of the rotor is changed to the inner ring of the stator, so that the length of the shaft is greatly shortened. The thrust structure no longer occupies the length of the submersible motor, the overall structure can be shortened, the structure is more compact, the assembly is more convenient, the cost is reduced, and the shaft was previously long and the processing cost was high. After the thrust structure is built in, the length of the shaft can be greatly shortened, reducing the processing cost; 5. After the balance ring is set, the balance performance of the rotor can be further improved, avoiding large rotational inertia under high-speed operation and ensuring the stability of high-speed operation; 6. The housing and the lower stop ring are made of stainless steel, which is not easy to oxidize and has high strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a structural schematic diagram of the sand throwing ring assembly of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the sealing ring of the present invention;

[0025] Figure 3 It is a structural schematic diagram of the actual use state of the sealing ring thrust assembly of the present invention.

[0026] Reference numerals:

[0027] 1-coupling; 2-rotating shaft; 3-sealing ring; 31-sealing section; 32-matching section; 33-first fitting section; 34-transition section; 35-second fitting section; 36-avoidance chamfer; 4-sealing seat; 5-sealing pad; 6-end cover; 7-lead cable; 71-sealing ring; 81-rotor; 82-statator; 83-slide plate; 84-key; 85-thrust bearing; 86-lower guide bearing; 87-lower stop ring; 88-balance ring; 89-housing. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection

[0031] , or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0033] like Figure 1 and Figure 2As shown, the present invention is a highly sealed submersible motor, comprising a coaxially arranged housing 89 and a rotating shaft 2, end covers 6 are provided at both ends of the housing 89, a sand throwing ring assembly is provided between the end cover 6 and the rotating shaft 2, a rotor 81 and a stator 82 are provided inside the housing 89, the rotor 81 is fixedly connected to the rotating shaft 2, a thrust assembly is provided on the inner ring of the stator 82, and the thrust assembly is coaxially arranged with the rotating shaft 2.

[0034] The sand-flinging ring assembly includes a coaxially arranged sealing ring 3, a sealing seat 4 and a sealing gasket 5. The sealing gasket 5 is embedded in the end cover 6 of the submersible motor and is locked with the end cover 6. The sealing seat 4 is arranged on the side of the sealing gasket 5 away from the end cover 6. The sealing ring 3 is arranged on the side of the sealing seat 4 away from the sealing gasket 5. The sealing ring 3 includes a sealing section 31 and a matching section 32. The sealing section 31 is fitted with the rotating shaft 2 of the submersible motor. The matching section 32 is arranged at one end close to the sealing seat 4. The sealing seat 4 is T-shaped and one end is arranged on the inner ring of the matching section 32 and is in contact with it, and the other end extends outwardly to be provided with a cover on the sealing gasket 5. The sealing seat 4 and the sealing gasket 5 are locked on the end cover 6.

[0035] Preferably, the sealing section 31 includes a first fitting section 33, a transition section 34 and a second fitting section 335 which are arranged and connected in sequence. The first fitting section 33 and the second fitting section 335 correspond to different diameter positions of the rotating shaft 2. The transition section 34 is arranged corresponding to the chamfer of the rotating shaft 2 and is set according to the shape of the rotating shaft 2 to ensure close fitting at each stage and improve the sealing performance.

[0036] Preferably, the rotating shaft 2 is connected to an external driving device through the coupling 1. After the coupling 1 is set, products of different specifications can be driven, and the connection is more convenient and quick; more preferably, the sealing ring 3 is arranged between the coupling 1 and the sealing seat 4, and the sealing ring 3 is arranged in contact with the end face of the coupling 1, so as to realize the full sealing of the output part of the rotating shaft 2 and improve the sealing performance. The sealing ring 3 is provided with an outward avoidance chamfer 36 at one end close to the coupling 1, and the inside of the avoidance chamfer 36 does not contact the rotating shaft 2. Because the matching part of the rotating shaft 2 and the coupling 1 is mostly threaded, after the avoidance chamfer 36 is provided, firstly, wear caused by direct contact with the thread can be avoided, and secondly, the avoidance chamfer 36 can avoid the generation of vacuum during the installation of the coupling 1, thereby ensuring smooth installation.

[0037] Preferably, the sealing gasket 5 is T-shaped and one end of the small head is embedded in the end cover 6. The embedded structure can effectively prevent

[0038] Stop water from flowing back into the environment and improve sealing performance.

[0039] Preferably, the thickness of the fitting segment 32 is greater than the thickness of the sealing segment 31 , and the inner ring of the fitting segment 32 is arranged in fitting contact with the sealing seat 4 to ensure the strength of the fitting segment 32 and avoid deformation due to fitting force.

[0040] Preferably, the sealing ring 3 is integrally formed of rubber material, has good wear resistance, is anti-oxidation and has a long service life.

[0041] Preferably, the end cover 6 is provided with a connecting cable 7 extending outward to ensure connection with an external power source and meet the rotation requirements. A sealing ring 71 is provided between the connecting cable 7 and the end cover 6 to ensure the sealing connection performance of the connecting cable 7, prevent dust and impurities from entering the interior of the submersible motor from here, and improve the sealing of the entire submersible motor.

[0042] The thrust assembly includes a rotor 81 and a stator 82 that rotate relative to each other. The rotor 81 is fixed on the rotating shaft 2. The inner ring of the stator 82 is provided with a coaxial slide plate 83, a thrust bearing 85 and a lower guide bearing 86. One end of the slide plate 83 is contacted with the shoulder of the rotating shaft 2, and the slide plate 83 is fixed to the rotating shaft 2 by a key 84. One end of the thrust bearing 85 is contacted with the slide plate 83, and the other end is contacted with the lower guide bearing 86. One end of the lower guide bearing 86 away from the thrust bearing 85 is fixedly locked on the lower stop ring 87. The lower stop ring 87 is fixedly arranged on the inner ring of the housing 89 of the submersible motor. The side of the lower stop ring 87 that does not lock the lower guide bearing 86 is contacted with the stator 82. The lower guide bearing 86 mainly bears the mechanical unbalanced force of the rotor 81 and the unilateral magnetic pulling force caused by the eccentricity of the rotor 81. Its main function is to prevent the swing of the rotating shaft 2. It is used in conjunction with the thrust bearing 85 and has a compact structure.

[0043] Preferably, the lower guide bearing 86 is fixed to the lower stop ring 87 by stud bolts, and the connection is detachable, which makes assembly faster. The lower stop ring 87 is welded to the inner ring of the housing 89 as a whole, which has high strength, reduces the number of assembly parts, and improves assembly efficiency.

[0044] Preferably, a balance ring 88 is provided at one end of the rotor 81 close to the stator 82. The balance ring 88 is arranged on the inner ring of the stator 82 and is coaxial with the quasi-axis. After the balance ring 88 is arranged, the balance performance of the rotor 81 can be further improved, and a large moment of inertia is avoided under high-speed operation, thereby ensuring the stability of high-speed operation; more preferably, the balance ring 88 is made of cast iron and is hot-cast as one with the rotating shaft 2. The cast iron material has low cost and is hot-cast as one with the rotating shaft 2, which reduces the number of parts and improves assembly efficiency.

[0045] Preferably, the outer diameter of the balance ring 88 is equal to the outer diameter of the slide plate 83 to avoid interference with the stator 82 due to being too large; more preferably, the maximum outer diameter of the lower guide bearing 86 is equal to the outer diameter of the thrust bearing 85 and the thickness of the two are consistent, which is conducive to the lower guide bearing 86 applying balanced force to the thrust bearing 85, making the fixation more stable, the inner ring of the thrust bearing 85 does not contact the rotating shaft 2, and the outer diameter of the thrust bearing 85 is larger than the outer diameter of the slide plate 83.

[0046] Preferably, the housing 89 and the lower stop ring 87 are made of stainless steel, which is not easily oxidized and has high strength.

[0047] In actual use, the sealing ring 3 fits tightly on the rotating shaft 2, and one end fits with the coupling 1, and the inner side of the other end cooperates with the sealing seat 4. The sealing seat 4 and the sealing gasket 5 are locked on the end cover 6. The whole structure completely isolates the connecting part of the rotating shaft 2 from the outside, realizes the sealing of the rotating shaft 2, and can prevent fine sand in the water from entering the hollow motor, thereby improving the safety performance of the whole device. The structure is simple, the adjustment is convenient, the sealing performance is good, and the service life is extended. On the basis of adding the sand throwing ring assembly, the thrust structure is changed, and the thrust structures originally arranged on the rotating shaft 2 and at both ends of the rotor 81 are arranged inside the stator 82, and the slide plate 83, the thrust bearing 85 and the lower guide bearing 86 are all arranged on the inner ring of the stator 82, and the balance ring 88 is also arranged on the inner ring of the stator 82, which greatly shortens the length of the rotating shaft 2, thereby shortening the length of the entire submersible motor, reducing the processing cost of the rotating shaft 2, making the structure more compact, and correspondingly reducing the specifications of other parts, reducing the overall cost of the submersible motor, and the whole structure is simple and compact, and the assembly is faster and more convenient.

[0048] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. Highly sealed submersible motor, Features: It comprises a coaxially arranged housing and a rotating shaft, end covers are arranged at both ends of the housing, a sand throwing ring assembly is arranged between the end covers and the rotating shaft, a rotor and a stator are arranged inside the housing, the rotor is fixedly connected to the rotating shaft, a thrust assembly is arranged coaxially with the rotating shaft on the inner ring of the stator; The sand throwing ring assembly comprises a coaxially arranged sealing ring, a sealing seat and a sealing gasket, the sealing gasket is embedded in the end cover of the submersible motor and is locked with the end cover, the sealing seat is arranged on a side of the sealing gasket away from the end cover, the sealing ring is arranged on a side of the sealing seat away from the sealing gasket, the sealing ring comprises a sealing section and a matching section, the sealing section is fitted with the rotating shaft of the submersible motor, the matching section is arranged at one end close to the sealing seat, the sealing seat is T-shaped and one end is arranged on the inner ring of the matching section and is in contact with it, and the other end is extended outwardly to set a cover on the sealing gasket, and the sealing seat and the sealing gasket are locked on the end cover; The thrust assembly comprises a coaxial slide plate, a thrust bearing and a lower guide bearing, one end of the slide plate is in contact with the shoulder of the rotating shaft, the slide plate is fixed to the rotating shaft by a key, one end of the thrust bearing is in contact with the slide plate, and the other end is in contact with the lower guide bearing, one end of the lower guide bearing away from the thrust bearing is fixedly locked on the lower stop ring, the lower stop ring is fixedly arranged on the inner ring of the housing of the submersible motor, and the side of the lower stop ring that does not lock the lower guide bearing is in contact with the stator; The sealing section comprises a first fitting section, a transition section and a second fitting section which are sequentially arranged and connected, the first fitting section and the second fitting section correspond to different diameter positions of the rotating shaft, and the transition section is arranged corresponding to the chamfer of the rotating shaft; The rotating shaft is connected to an external driving device via a coupling; The sealing ring is arranged between the coupling and the sealing seat, the sealing ring is arranged in contact with the end surface of the coupling, and an outward avoidance chamfer is arranged at one end of the sealing ring close to the coupling, and the inside of the avoidance chamfer does not contact the rotating shaft; The sealing gasket is T-shaped and one end of the small head is embedded in the end cover, and the sealing ring is integrally formed of rubber material; The thickness of the matching section is greater than the thickness of the sealing section; The end cover is provided with a lead-in cable extending outward, and a sealing ring is provided between the lead-in cable and the end cover; The lower guide bearing is fixed on the lower stop ring by stud bolts, and the lower stop ring is welded to the inner ring of the housing as a whole.

2. The high-seal submersible motor according to claim 1, Features: A balance ring is provided at one end of the rotor close to the stator. The balance ring is arranged on the inner ring of the stator and is coaxial with the quasi-axis. The balance ring is made of cast iron and is hot-casted as a whole with the rotating shaft.

3. The high-seal submersible motor according to claim 1, Features: The shell and the lower stop ring are made of stainless steel.

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