Miniature axial flow pump with shielding type structure

Abstract

The invention discloses a miniature axial flow pump with a shielding type structure, and relates to the technical field of axial flow pumps. The pump comprises a pump body assembly, a motor mechanism and an impeller assembly. The pump body assembly comprises a front pump body, a rear pump body and a middle pump body; the motor mechanism comprises a stator assembly and a rotor assembly, the stator assembly and the rotor assembly are coaxially arranged, and a second channel is formed between the stator assembly and the rotor assembly; the impeller assembly comprises a rotor inner blade and a rotor outer blade located outside the rotor shielding sleeve. According to the invention, the applicability to various working conditions is realized by changing the blade types of the blades in the rotor and various changeable water inlet and outlet modes, the blades are integrated in the rotor main shaft, the volume of the pump is reduced, the first channel between the rotor main shaft and the blades in the rotor and the second channel between the stator assembly and the rotor assembly form two channels, and the efficiency of the pump is improved. And meanwhile, the motor mechanism is completely arranged in the working liquid, so that the heat dissipation performance is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field related to axial flow pumps, and in particular relates to a shielded structure micro axial flow pump. Background Art

[0002] A canned motor pump is a non-dynamically sealed pump. The pump and the drive motor are integrated into one, and both are enclosed in a casing filled with the conveying medium. The power is transmitted to the rotor through the stator electromagnetic field, and the rotor rotates in the conveyed medium.

[0003] An axial flow pump is a pump that relies on the force exerted by the blades of a rotating impeller on the liquid to transport the liquid along the axial direction. The flow rate of an axial flow pump is large, and the flow rate can be easily changed by changing the installation angle of the blades. At the same time, the structure of the axial flow pump is simple, but the existing conventional axial flow pumps are large in size, consume a lot of power, and have high operating costs. The heat generated by the motor during operation is not easy to dissipate, which can easily cause damage to the motor. To this end, we provide a shielded structure micro axial flow pump to solve the above technical problems. Summary of the invention

[0004] The object of the present invention is to provide a shielded micro axial flow pump, which solves the problems in the above technical background through the specific structural design of the pump body assembly, the motor mechanism and the impeller assembly.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a shielded structure micro axial flow pump, comprising a pump body assembly, a motor mechanism and an impeller assembly, wherein the motor mechanism is arranged inside the pump body assembly, the motor mechanism comprises a stator assembly and a rotor assembly, the stator assembly is fixed inside the pump body assembly, and the rotor assembly and the stator assembly are arranged coaxially; the rotor assembly includes a rotor main shaft, and the rotor main shaft is a hollow structure; the impeller assembly includes rotor inner blades and rotor outer blades, and the rotor inner blades are arranged inside the rotor main shaft for coaxial rotation.

[0006] The present invention is further configured such that the pump body assembly includes symmetrically arranged end covers, a front pump body and an intermediate pump body, the end covers are respectively sealed and connected at both ends of the intermediate pump body, the end covers include a through hole and a bearing seat assembly, the through hole is opened at the axially symmetrical center position of the front pump body, and the bearing seat assembly is fixedly connected inside the through hole.

[0007] The present invention is further configured as follows: the bearing seat assembly includes a bearing seat and a main bearing, the end cover is provided with a bearing seat, the bearing seat is provided with a main bearing, an interference fit is adopted between the main bearing and the bearing seat, so as to achieve the fixation of the main bearing; a through hole for liquid to pass through is opened on the surface of the bearing seat, and a spiral channel is provided on the inner wall of the main bearing, and a thrust bearing is provided in combination with the main bearing.

[0008] The present invention is further configured such that a plurality of channels are arranged in the pump body assembly, the channels include a first channel formed by the inner blades of the rotor and the rotor main shaft and a second channel formed by the rotor assembly and the stator assembly, and a connecting hole connected to the second channel is arranged on the bearing seat; the inner blades of the rotor and the rotor main shaft are fixedly connected by triangular supports, and a plurality of flow channels exist at the connection between the inner blades of the rotor and the rotor main shaft.

[0009] The present invention is further configured as follows: the stator assembly includes a stator core and a stator shielding sleeve, and the stator shielding sleeve is arranged on the outside of the stator core; the inner blades of the rotor are coaxially arranged with the rotor main shaft, the outer sleeve of the rotor main shaft is provided with a rotor shielding sleeve, the rotor shielding sleeve is fixedly connected to the rotor assembly, and the outer blades of the rotor are fixed on the rotor shielding sleeve; the inner wall of the cavity of the intermediate pump body is provided with a positioning step for installing the stator assembly, the outer sleeve of the stator assembly is provided with a stator shielding sleeve, and the stator shielding sleeve is fixedly connected to the stator assembly.

[0010] The present invention is further configured as follows: the stator assembly is installed at a positioning step and fixedly connected to the intermediate pump body, the stator assembly is arranged on the radially outer side of the rotor assembly, and the stator assembly is fixed on the cavity surface of the intermediate pump body at the stator assembly positioning step, and the stator assembly and the inner surface of the intermediate pump body are tightly matched; the main bearing is a sliding bearing structure, the inner wall of the main bearing is provided with a spiral groove for liquid to pass through, a plurality of thrust bearings matching the main bearing are provided on the rotor main shaft, and a mechanical sealing assembly is provided on one side of the main bearing; the space between the rotor assembly and the stator assembly is filled with cooling medium, and the internal cavity of the motor stator assembly is completely encapsulated with insulating material.

[0011] The present invention has the following beneficial effects: 1. The present invention greatly increases the guaranteed working range by providing an impeller assembly, adopting detachable and replaceable rotor inner blades, and providing a variety of seals and water inlets and outlets.

[0012] 2. The present invention greatly compresses the space originally required for arranging the axial flow blades of the axial flow pump by arranging the blades in the shaft, thereby greatly reducing the volume of the pump.

[0013] 3. The present invention can improve the head of the micro axial flow pump by providing a double channel consisting of a second channel between the stator assembly and the rotor assembly and a first channel between the rotor inner blades and the rotor main shaft.

[0014] 4. The present invention provides a shielded structure for the pump body assembly and the motor mechanism, so that the pump can flow through the bearings and the surfaces of the stator and rotor of the motor while conveying the medium. The medium is used to cool and lubricate the main shaft and the bearings, and to dissipate the heat for the whole. This can greatly improve the overall heat dissipation capacity, improve its working efficiency, and ensure its service life.

[0015] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 It is a longitudinal structural cross-sectional view of a shielded micro axial flow pump.

[0018] Figure 2 for Figure 1 Schematic diagram of the structure from another angle.

[0019] Figure 3 It is a longitudinal structural cross-sectional view of the pump body assembly in the present invention.

[0020] Figure 4 for Figure 3 Schematic diagram of the structure from another angle.

[0021] Figure 5 It is a longitudinal structural cross-sectional view of the motor mechanism and the impeller assembly used in conjunction with each other in the present invention.

[0022] Figure 6 for Figure 5 Schematic diagram of the structure from another angle.

[0023] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1- pump body assembly, 11- end cover, 111- through hole, 112- bearing seat assembly, 1121- main bearing, 1122- bearing seat, 1123- thrust bearing, 12- front pump body, 2- motor mechanism, 21- stator assembly, 211- stator core, 212- stator shielding sleeve, 13- intermediate pump body, 22- rotor assembly, 221- rotor main shaft, 222- rotor core, 223- rotor shielding sleeve, 3- impeller assembly, 31- rotor outer blades, 32- rotor inner blades. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] For specific embodiment 1, please refer to Figure 1-6 The present invention is a shielded structure micro axial flow pump, including a pump body assembly 1, a motor mechanism 2 and an impeller assembly 3. Specifically, the motor mechanism 2 is arranged inside the pump body assembly 1, and the motor mechanism 2 includes a stator assembly 21 and a rotor assembly 22. The stator assembly 21 is fixed inside the pump body assembly 1, and the rotor assembly 22 is coaxially arranged with the stator assembly 21; the rotor assembly 22 includes a rotor main shaft 221, and the rotor main shaft 221 is a hollow structure; the impeller assembly 3 includes a rotor inner blade 31 and a rotor outer blade 32, and the rotor inner blade 31 is coaxially rotatably arranged inside the rotor main shaft 221.

[0026] Furthermore, a plurality of channels are provided in the pump body assembly 1, including a first channel formed by the rotor blades 31 and the rotor main shaft 221 and a second channel formed by the rotor assembly 22 and the stator assembly 21, and a connecting hole connected to the second channel is provided on the bearing seat 1122.

[0027] The operation process of this embodiment is as follows: after the motor mechanism 2 is powered on, a magnetic field is formed between the rotor assembly 22 and the stator assembly 21. The magnetic field generates a force acting on the rotor assembly 22, so that the rotor assembly 22 rotates at a high speed, driving the rotor inner blades 32 and the rotor outer blades 31 to rotate at a high speed, and enter the first channel through the through hole 111 through the flow channel between the end cover 11 and the bearing seat assembly 112. In the first channel, the rotor inner blades 32 do work on the liquid to increase its pressure energy, so that the liquid flows out along the first channel. A part of the liquid entering the pump body will enter the second channel formed by the stator assembly 21 and the rotor assembly 22. In the second channel, the liquid will increase its pressure energy under the work of the rotor outer blades 31 and then flow out of the second channel. The work done through the first channel and the second channel will significantly improve the efficiency and head of the entire pump.

[0028] For specific embodiment 2, please refer to Figure 1-6 On the basis of the specific embodiment 1, specifically, the pump body assembly 1 includes a symmetrically arranged end cover 11, a front pump body 12 and an intermediate pump body 13. Separating the pump body assembly 1 into three parts is conducive to the later assembly and disassembly, and reduces the later maintenance cost. The end cover 11 is sealed and connected to the two ends of the intermediate pump body 13 respectively. The end cover 11 includes a through hole 111 and a bearing seat assembly 112. The through hole 111 is opened at the axially symmetrical center position of the front pump body 12, and the bearing seat assembly 112 is fixedly connected inside the through hole 111.

[0029] Furthermore, the bearing seat assembly 112 includes a bearing seat 1121 and a main bearing 1122. The bearing seat 1121 is provided on the end cover 11, and the main bearing 1122 is provided on the bearing seat 1121. An interference fit is adopted between the main bearing 1122 and the bearing seat 1121, so as to realize the fixation of the main bearing 1122. A through hole for liquid to pass through is opened on the surface of the bearing seat 1122, and a spiral channel is provided on the inner wall of the main bearing 1122, so that the conveying medium can lubricate and dissipate heat for the main bearing 1122, thereby ensuring that the temperature of the main bearing 1122 will not be too high and reducing wear. A thrust bearing 1123 is matched with the main bearing 1122, and a thrust bearing 1123 is matched with the main bearing 1122.

[0030] Furthermore, the inner rotor blades 31 are fixedly connected to the rotor main shaft 221 via triangular supports, the inner rotor blades 32 are a separate detachable and replaceable component, and there are several flow channels at the connection between the inner rotor blades 32 and the rotor main shaft 221, which can allow the conveying medium to smoothly enter the first channel.

[0031] Furthermore, the stator assembly 21 includes a stator core 211 and a stator shielding sleeve 212, and the stator shielding sleeve 212 is sleeved on the outside of the stator core 211; the inner rotor blades 32 are coaxially arranged with the rotor main shaft 221, and the outer rotor main shaft 221 is sleeved with a rotor shielding sleeve 223, the rotor shielding sleeve 223 is fixedly connected to the rotor assembly 22, and the outer rotor blades 31 are fixed on the rotor shielding sleeve 223; the inner wall of the cavity of the intermediate pump body 12 is provided with a positioning step for installing the stator assembly 21, and the outer stator assembly 21 is sleeved with a stator shielding sleeve 212, and the stator shielding sleeve 212 is fixedly connected to the stator assembly 21, and it is necessary to ensure that the stator assembly 21 and the rotor main shaft 221 are installed coaxially.

[0032] Furthermore, the stator assembly 21 is installed at the positioning step and is fixedly connected to the intermediate pump body 12. The stator assembly 21 is arranged on the radial outer side of the rotor assembly 22, and the stator assembly 21 is fixed on the stator assembly positioning step on the cavity surface of the intermediate pump body 13. The stator assembly 21 and the inner surface of the intermediate pump body 13 are tightly matched; the main bearing 1122 is a sliding bearing structure, and the inner wall of the main bearing 1122 is provided with a spiral groove for liquid to pass through. A plurality of thrust bearings matching the main bearing 1122 are provided on the rotor main shaft 221, and a mechanical sealing assembly is provided on one side of the main bearing 1122; the space between the rotor assembly 22 and the stator assembly 21 is filled with cooling medium, and the internal cavity of the motor stator assembly 21 is completely sealed with insulating material.

[0033] The operation process of this embodiment is as follows: the rotor main shaft 221 is supported on the main bearing 1122. When the rotor main shaft 221 of the pump rotates at high speed, the working medium flowing into the pump body through the through hole 111 will flow through the main bearing 1122, the gap between the rotor main shaft 221 and the rotor assembly 22, and the gap between the rotor assembly 22 and the stator assembly 21. In this way, the self-lubrication of the bearing can be achieved, so that the whole pump does not need to add additional lubricating fluid, ensuring the purity of the overall working fluid. At the same time, when the fluid flows through, it will take away the heat generated by the pump operation, greatly improving the heat dissipation of the bearing while ensuring no pollution to the working medium. A thrust bearing 1123 that matches the main bearing 1122 is arranged on the rotor main shaft 221. The thrust bearing can prevent the axial force generated by the pump during operation from affecting the operation of the entire pump.

[0034] The liquid inlet mode of the first channel formed by the rotor main shaft 221 and the rotor inner blades 32 is changed, and the connection between the rotor main shaft 221 and the rotor inner blades 32 is set to a completely sealed state. At the same time, evenly distributed holes for liquid to pass through are opened on the front and rear end side walls of the rotor main shaft 221, so that more liquid flows through the second channel, thereby taking away more heat. This can make the overall heat dissipation performance of the motor 2 more superior. The rotor inner blades 32 and the rotor main shaft 221 are detachably connected, which can make replacement faster and more convenient when suitable for different working conditions.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A shielded micro axial flow pump, comprising a pump body assembly (1), a motor mechanism (2) and an impeller assembly (3), characterized in that: The motor mechanism (2) is arranged inside the pump body assembly (1), the motor mechanism (2) comprises a stator assembly (21) and a rotor assembly (22), the stator assembly (21) is fixed inside the pump body assembly (1), and the rotor assembly (22) and the stator assembly (21) are arranged coaxially; The rotor assembly (22) comprises a rotor main shaft (221), and the rotor main shaft (221) is a hollow structure; The impeller assembly (3) comprises inner rotor blades (31) and outer rotor blades (32), wherein the inner rotor blades (31) are coaxially rotatably arranged inside the rotor main shaft (221).

2. A shielded micro axial flow pump according to claim 1, characterized in that: The pump body assembly (1) comprises symmetrically arranged end covers (11), a front pump body (12) and an intermediate pump body (13); the end covers (11) are respectively sealed and connected to two ends of the intermediate pump body (13); the end covers (11) comprise a through hole (111) and a bearing seat assembly (112); the through hole (111) is opened at the axially symmetrical center position of the front pump body (12); and the bearing seat assembly (112) is fixedly connected inside the through hole (111).

3. A shielded micro axial flow pump according to claim 2, characterized in that: The bearing seat assembly (112) comprises a bearing seat (1121) and a main bearing (1122); the end cover (11) is provided with the bearing seat (1121); the bearing seat (1121) is provided with the main bearing (1122); an interference fit is adopted between the main bearing (1122) and the bearing seat (1121), thereby achieving fixation of the main bearing (1122); The surface of the bearing seat (1122) is provided with a through hole through which liquid can pass, and the inner wall of the main bearing (1122) is provided with a spiral channel. The main bearing (1122) is matched with a thrust bearing (1123).

4. A shielded micro axial flow pump according to claim 3, characterized in that: A plurality of channels are provided in the pump body assembly (1), the channels comprising a first channel formed by the rotor inner blades (31) and the rotor main shaft (221) and a second channel formed by the rotor assembly (22) and the stator assembly (21), and a connecting hole connected to the second channel is provided on the bearing seat (1122).

5. A shielded micro axial flow pump according to claim 4, characterized in that: The rotor inner blades (31) and the rotor main shaft (221) are fixedly connected via triangular supports, and a plurality of flow passages are present at the connection between the rotor inner blades (32) and the rotor main shaft (221).

6. A shielded micro axial flow pump according to claim 5, characterized in that: The stator assembly (21) comprises a stator core (211) and a stator shielding sleeve (212), wherein the stator shielding sleeve (212) is sleeved outside the stator core (211); The inner rotor blades (32) are coaxially arranged with the rotor main shaft (221); a rotor shielding sleeve (223) is sleeved on the outside of the rotor main shaft (221); the rotor shielding sleeve (223) is fixedly connected to the rotor assembly (22); and the outer rotor blades (31) are fixed on the rotor shielding sleeve (223).

7. A shielded micro axial flow pump according to claim 6, characterized in that: The inner wall of the cavity of the intermediate pump body (12) is provided with a positioning step for installing the stator assembly (21); the stator assembly (21) is externally sleeved with a stator shielding sleeve (212); the stator shielding sleeve (212) is fixedly connected to the stator assembly (21).

8. The shielded micro axial flow pump according to claim 7, characterized in that: The stator assembly (21) is mounted at the positioning step and fixedly connected to the intermediate pump body (12); the stator assembly (21) is arranged radially outside the rotor assembly (22); and the stator assembly (21) is fixed at the stator assembly positioning step on the cavity surface of the intermediate pump body (13); the stator assembly (21) and the inner surface of the intermediate pump body (13) are tightly matched.

9. The shielded micro axial flow pump according to claim 7, characterized in that: The main bearing (1122) is a sliding bearing structure, the inner wall of the main bearing (1122) is provided with a spiral groove through which liquid can pass, the rotor main shaft (221) is provided with a plurality of thrust bearings that match the main bearing (1122), and one side of the main bearing (1122) is provided with a mechanical seal assembly; The space between the rotor assembly (22) and the stator assembly (21) is filled with cooling medium, and the internal cavity of the motor stator assembly (21) is completely encapsulated with insulating material.

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