Impeller mounting structure and pump

Abstract

The utility model provides an impeller mounting structure, which comprises a motor seat comprising a stator, a rotor and a mounting column fixed at the center of the motor seat, the mounting column is coaxial with the stator, and the rotor is coaxially mounted on the mounting column; an impeller group is coaxially fixed on the rotor and is mounted on the mounting column through a second bearing; a blind hole is formed in the mounting column; a front thrust ring is arranged at the end, away from the first bearing, of the second bearing and coaxially fixed to the mounting column. An annular groove is formed in the inner wall face, close to the front thrust ring, of the shaft sleeve of the second bearing, the annular groove penetrates through the end, close to the front thrust ring, of the shaft sleeve of the second bearing, and a cavity is defined by the front thrust ring, the mounting column and the groove wall of the annular groove; the first through hole is formed in the radial direction of the mounting column, and the cavity is communicated with the blind hole through the first through hole. According to the impeller installation structure and the pump, a thrust washer is not needed, and axial force generated by rotation of the impeller can be buffered.

Description

Technical Field

[0001] This utility model relates to the field of liquid conveying devices, specifically to an impeller mounting structure and a pump. Background Technology

[0002] The axial force of a pump is generated by the rotation of the pump during operation. The causes may include: (1) the liquid pressure acting on the front and rear cover plates of the impeller cannot be balanced, resulting in an axial force. (2) during the process of the liquid passing through the impeller, due to the change in the axial component of the liquid momentum, an impulse force is generated in the axial direction, also known as dynamic reaction force. The balance of the axial force of the pump has become the key to whether the pump can be widely used. At present, the axial force of the pump is mainly generated near the impeller. In the existing technology, the axial force of the pump is mainly relieved by the thrust washers and thrust bearings inside the pump, such as thrust rings. The thrust rings limit the impeller that generates the axial force, so as to avoid the axial force generated by the impeller affecting the normal operation of the pump.

[0003] Patent application number 202411564611.9 discloses a tightly connected permanent magnet direct-drive pump. This pump utilizes a thrust ring system, including a front thrust ring and a rear thrust ring. A thrust washer is located at the front end of the impeller, and the front thrust ring is coupled to it. The front thrust ring is mounted on a concave ring near the inlet in the inner cavity of the front cover, increasing the impeller's resistance to axial forces. This axial force resistance structure relies on the buffering effect of the thrust washer, requiring high wear resistance and regular inspection of the washer's wear. In pumps where the central shaft does not rotate, the impeller bearing is mounted on the central shaft and rotates synchronously with the rotor. In this case, if the thrust washer fails, the bearing sleeve, rotating synchronously with the impeller, will not only be affected by the axial force and squeezed against the thrust ring, but the sleeve will also rotate relative to the thrust ring, causing wear and severely affecting the normal operation of the impeller. Therefore, there is an urgent need for an impeller mounting structure and pump that can buffer axial forces. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the above-mentioned traditional technologies and provide an impeller mounting structure that can buffer axial forces.

[0005] The purpose of this utility model is achieved through the following technical measures: an impeller mounting structure, including a motor base containing a stator and a rotor driven by the stator, and a mounting column fixed at the center of the motor base, the mounting column being coaxial with the stator, the rotor being coaxially mounted on the mounting column via a first bearing; an impeller assembly is coaxially fixed at the end of the rotor away from the motor base, the impeller assembly being mounted on the mounting column via a second bearing; a blind hole is provided at the end of the mounting column away from the impeller assembly, the blind hole extending along the central axis of the mounting column to the other end face of the mounting column; a front thrust ring is provided at the end of the second bearing away from the first bearing, the front thrust ring being coaxially fixed to the mounting column; an annular groove is provided on the inner wall of the bushing of the second bearing near the front thrust ring, the groove penetrating the end of the bushing of the second bearing near the front thrust ring, the front thrust ring, the mounting column, and the groove wall of the annular groove forming a cavity; and a first through hole is provided radially along the mounting column, the first through hole communicating with the cavity and the blind hole.

[0006] Preferably, an installation sleeve is coaxially provided at one end of the impeller assembly near the motor base, and the installation column passes through the impeller assembly along the inside of the installation sleeve. The installation sleeve is coaxially installed on the installation column through a second bearing. A first fitting groove matching the outer circumferential contour of the installation sleeve is opened at the middle of the rotor at the end away from the motor. Several protrusions are provided on the inner circumferential wall of the first fitting groove, and a second fitting groove matching the protrusions is provided at the corresponding position on the outer circumferential wall of the installation sleeve.

[0007] Preferably, a guide sleeve is coaxially fixed at the end of the mounting sleeve away from the impeller assembly, the mounting column passes through the guide sleeve, and a guide through hole is coaxially opened at the bottom of the first fitting groove, the diameter of the guide through hole being equal to the outer diameter of the guide sleeve.

[0008] Preferably, it also includes a second through hole radially opened along the mounting post, wherein the inner wall surface of the bushing of the first bearing and the inner wall surface of the bushing of the second bearing are respectively connected to the blind hole through the corresponding second through hole.

[0009] Preferably, the groove wall of the annular groove is an inclined surface with a lower inner surface and a higher outer surface.

[0010] Preferably, a rear thrust ring is provided at the end of the first bearing away from the second bearing, and the rear thrust ring is coaxially fixed to the mounting post.

[0011] This utility model also provides a pump, which includes the impeller mounting structure provided by this utility model, and also includes a first housing, a motor base, a mounting column, and an impeller assembly, all located inside the first housing. The first housing, the impeller assembly, and the motor base form a flow channel. The first housing has a first liquid inlet and a first liquid outlet, which are respectively connected to the flow channel.

[0012] Preferably, it also includes a base plate with a threaded hole, the motor base is fixedly installed on the base plate, the outer wall of the first housing is provided with a rotatable screw corresponding to the threaded hole, the screw matches the threaded hole, and the base plate is provided with a second liquid outlet, which communicates with the first liquid outlet.

[0013] Preferably, it further includes a second housing coaxially disposed on the outer periphery of the first housing, one end of the second housing is fixedly installed on the base plate, and the other end of the housing is provided with a second liquid inlet, which communicates with the first liquid inlet.

[0014] Compared with the impeller mounting structure of the prior art, it has the following advantages:

[0015] 1. High-pressure liquid is injected through the external blind hole. The high-pressure liquid flows into the chamber sequentially through the blind hole and the first through hole. The continuous inflow of high-pressure liquid creates a high-hydraulic environment in the chamber. The high hydraulic pressure exerts pressure on the inner wall of the annular groove. This pressure generates a component force along the axial direction of the mounting column away from the front thrust ring. This component force can buffer the axial force generated when the impeller, which is mounted on the mounting column through the second bearing, rotates. This prevents the second bearing from being squeezed and worn against the front thrust ring under axial force, without relying on the wear resistance and service life of the thrust washer. By adjusting the hydraulic pressure of the injected liquid, it can be adapted to the axial force generated when transporting different fluids.

[0016] 2. Through the cooperation of the installation sleeve, the first fitting groove, the protrusion, and the second fitting groove structure, the impeller assembly and the rotor form a precise fitting connection, thereby realizing stable torque transmission between the impeller assembly and the rotor.

[0017] 3. Liquid is guided to the inner wall surface of the first bearing sleeve and the second bearing sleeve through the blind hole and the second through hole, thereby providing liquid lubrication to the corresponding inner wall surface of the sleeve; the high-pressure liquid generates radial outward pressure on the corresponding inner wall surface of the sleeve, and the first bearing and the second bearing play the role of liquid lubricating bearings. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the pump in a specific implementation.

[0019] Figure 2 This is a schematic diagram of the rotor structure in a specific implementation method;

[0020] Figure 3 This is a schematic diagram of the impeller assembly structure in a specific implementation method.

[0021] Wherein: 10, first housing; 101, first liquid inlet; 102, first liquid outlet; 103, screw; 201, motor base; 202, stator; 203, rotor; 2031, protrusion; 2032, guide through hole; 204, mounting post; 2041, blind hole; 2042, first through hole; 2043, second through hole; 30, second through hole; 40, impeller assembly; 401, mounting sleeve; 4011, second fitting groove; 402, guide sleeve; 50, second bearing; 501, chamber; 601, front thrust ring; 602, rear thrust ring; 70, base plate; 701, second liquid outlet; 80, second housing; 801, second liquid inlet. Detailed Implementation

[0022] The specific embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. "Connection" and "communication" can refer to indirect internal communication through a pipe or direct communication. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0025] The component force exerted on the second bearing 50 by the high-pressure liquid flowing into the blind hole 2041, along the axial direction of the mounting post 204 away from the front thrust ring 601, is determined by the maximum axial force generated when the buffer impeller rotates, and is not limited to a specific pressure; the same principle applies to the selection of the strength of the thrust washer, and will not be repeated here.

[0026] like Figure 1 As shown, this specific embodiment provides a pump, including an impeller mounting structure and a first housing 10. The impeller includes a motor base 201 containing a stator 202 and a rotor 203 driven by the stator 202. It also includes a mounting post 204 fixed to the center of the motor base 201. The mounting post 204 is coaxial with the stator 202. The rotor 203 is coaxially mounted on the mounting post 204 through a second through hole 30. An impeller assembly 40 is coaxially fixed to one end of the rotor 203 away from the motor base 201. The impeller assembly 40 is mounted on the mounting post 204 through a second bearing 50. A blind hole 2041 is provided at one end of the mounting post 204 away from the impeller assembly 40. The blind hole 2041 extends along the central axis of the mounting post 204 to the other end face of the mounting post 204. The second bearing 50 is located away from the second through hole. One end of the 30 is provided with a front thrust ring 601, which is coaxially fixed to the mounting post 204; the inner wall of the bushing of the second bearing 50 adjacent to the front thrust ring 601 is provided with an annular groove, which penetrates the bushing of the second bearing 50 adjacent to the front thrust ring 601. The front thrust ring 601, the mounting post 204 and the groove wall of the annular groove form a cavity 501; it also includes a first through hole 2042 radially opened along the mounting post 204, which connects the cavity 501 and the blind hole 2041; it also includes a second through hole 2043 radially opened along the mounting post 204, which connects the inner wall of the bushing of the second through hole 30 and the inner wall of the bushing of the second bearing 50 to the blind hole 2041 through the corresponding second through hole 2043. The motor base 201, mounting column 204, and impeller assembly 40 are all located inside the first housing 10. The first housing 10, impeller assembly 40, and motor base 201 form a flow channel. The first housing 10 has a first liquid inlet 101 and a first liquid outlet 102, which are respectively connected to the flow channel.

[0027] Working principle: High-pressure liquid is continuously introduced into the blind hole 2041. Taking water as an example, the high-pressure water flows through the blind hole 2041 and through the first through hole 2042 into the chamber 501, forming a high-pressure water environment in the chamber 501. The high-pressure water exerts pressure on the inner wall of the annular groove, thereby generating an axial force on the second bearing 50 away from the front thrust ring 601. When the impeller assembly 40 rotates, an axial force is generated due to the action of the fluids in front and behind the impeller assembly 40. At this time, the component force generated by the high-pressure water in the chamber 501 on the second bearing 50 can offset the axial force, preventing the second bearing 50 from contacting the front thrust ring 601, avoiding hard extrusion and rotational wear between the second bearing 50 and the front thrust ring 601, extending the service life of the second bearing 50 and the front thrust ring 601, and avoiding the loss of kinetic energy of the impeller. At the same time, high-pressure water is supplied to the inner wall of the bushing of the second through hole 30 and the inner wall of the bushing of the second bearing 50 through the corresponding second through hole 2043. At this time, the second through hole 30 and the second bearing 50 are equivalent to water-lubricated bearings, ensuring the synchronous rotation of the rotor 203 and the impeller.

[0028] like Figure 2 and 3 As shown, an installation sleeve 401 is coaxially mounted on one end of the impeller assembly 40 near the motor base 201. A mounting column 204 penetrates the impeller assembly 40 along the interior of the installation sleeve 401. The installation sleeve 401 is coaxially mounted to the mounting column 204 via a second bearing 50. A first fitting groove matching the outer contour of the installation sleeve 401 is formed in the middle of the rotor 203 at the end away from the motor. Several protrusions 2031 are provided on the inner wall of the first fitting groove. A second fitting groove 4011 matching the protrusions 2031 is provided on the corresponding position of the outer wall of the installation sleeve 401. A guide sleeve 402 is coaxially fixed to the end of the installation sleeve 401 away from the impeller assembly 400. The mounting column 204 penetrates the guide sleeve 402. A guide through hole 2032 is coaxially formed at the bottom of the first fitting groove. The diameter of the guide through hole 2032 is equal to the outer diameter of the guide sleeve 402.

[0029] During installation, the guide sleeve 402 corresponds to the guide through hole 2032, the protrusion 2031 is aligned with the second fitting groove 4011, and is inserted axially. The protrusion 2031 is inserted into the second fitting groove 4011, and the guide sleeve 402 is inserted into the guide through hole 2032. At this time, the installation sleeve 401 is precisely inserted into the first fitting groove. When the rotor 203 rotates, the fitting structure of the protrusion 2031 and the second fitting groove 4011 realizes the torque transmission between the rotor 203 and the impeller assembly 40. The transmission structure is stable and reliable.

[0030] Because the second bearing 50 has a thinner structure, the groove wall of the annular groove is a sloping surface with a lower inner surface and a higher outer surface. The smooth sloping surface is easy to process and has higher structural strength than the shape of the groove wall that is not smooth, thus avoiding breakage due to high water pressure at the corner of the groove wall.

[0031] A rear thrust ring 602 is provided at the end of the second through hole 30 away from the second bearing 50, and the rear thrust ring 602 is coaxially fixed to the mounting post 204.

[0032] To facilitate the assembly and disassembly of the motor mount 201, a base plate 70 with threaded holes is also included. The motor mount 201 is fixedly installed on the base plate 70. A rotatable screw 103 is provided on the outer wall of the first housing 10 at the corresponding threaded hole. The screw 103 matches the threaded hole. The base plate 70 is provided with a second liquid outlet 701, which communicates with the first liquid outlet 102.

[0033] To protect the screw 103 and the screw hole structure, a second housing 80 is also included, which is coaxially disposed on the outer periphery of the first housing 10. One end of the second housing 80 is fixedly installed on the base plate 70, and the other end of the housing is provided with a second liquid inlet 801, which communicates with the first liquid inlet 101.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An impeller mounting structure, comprising a motor mount including a stator and a rotor driven by said stator, characterized in that, It also includes a mounting post fixed to the center of the motor base, the mounting post being coaxial with the stator, and the rotor being coaxially mounted to the mounting post via a first bearing; an impeller assembly is coaxially fixed to the end of the rotor away from the motor base, and the impeller assembly is mounted to the mounting post via a second bearing; a blind hole is provided at the end of the mounting post away from the impeller assembly, the blind hole extending along the central axis of the mounting post to the other end face of the mounting post; a front thrust ring is provided at the end of the second bearing away from the first bearing, the front thrust ring being coaxially fixed to the mounting post; an annular groove is provided on the inner wall of the bushing of the second bearing adjacent to the front thrust ring, the groove penetrating the end of the bushing of the second bearing adjacent to the front thrust ring, the front thrust ring, the mounting post, and the groove wall of the annular groove forming a cavity; it also includes a first through hole radially opened along the mounting post, the first through hole communicating with the cavity and the blind hole.

2. The impeller mounting structure according to claim 1, characterized in that, The impeller assembly is coaxially provided with a mounting sleeve at one end near the motor base. The mounting column passes through the impeller assembly along the inside of the mounting sleeve. The mounting sleeve is coaxially mounted to the mounting column through the second bearing. The rotor is provided with a first fitting groove at the middle of the end away from the motor, which matches the outer circumferential contour of the mounting sleeve. The inner circumferential wall of the first fitting groove is provided with a plurality of protrusions. The outer circumferential wall of the mounting sleeve is provided with a second fitting groove at a corresponding position that matches the protrusions.

3. The impeller mounting structure according to claim 2, characterized in that, The mounting sleeve is coaxially fixed to a guide sleeve at one end away from the impeller assembly. The mounting column passes through the guide sleeve. A guide through hole is coaxially opened at the bottom of the first fitting groove. The diameter of the guide through hole is equal to the outer diameter of the guide sleeve.

4. The impeller mounting structure according to claim 3, characterized in that, It also includes a second through hole radially opened along the mounting post, wherein the inner wall surface of the bushing of the first bearing and the inner wall surface of the bushing of the second bearing are respectively connected to the blind hole through the corresponding second through hole.

5. The impeller mounting structure according to claim 1, characterized in that, The groove wall of the annular groove is an inclined surface that is lower on the inside and higher on the outside.

6. The impeller mounting structure according to claim 1, characterized in that, The first bearing has a rear thrust ring at the end away from the second bearing, and the rear thrust ring is coaxially fixed to the mounting post.

7. A pump comprising the impeller mounting structure as described in any one of claims 1-6, characterized in that, It also includes a first housing, in which the motor base, mounting column, and impeller assembly are all located. The first housing, the impeller assembly, and the motor base form a flow channel. The first housing has a first liquid inlet and a first liquid outlet, which are respectively connected to the flow channel.

8. The pump according to claim 7, characterized in that, It also includes a base plate with a threaded hole, the motor base is fixedly installed on the base plate, the outer wall of the first housing is provided with a rotatable screw corresponding to the threaded hole, the screw matches the threaded hole, the base plate is provided with a second liquid outlet, the second liquid outlet communicates with the first liquid outlet.

9. The pump according to claim 8, characterized in that, It also includes a second housing coaxially disposed on the outer periphery of the first housing, one end of the second housing is fixedly installed on the base plate, and the other end of the housing is provided with a second liquid inlet, which communicates with the first liquid inlet.

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