Pump structure

Abstract

The present invention discloses a pump structure, comprising: a pump casing having a hollow cavity, in which an impeller is accommodated, and the pump casing is provided with a liquid inlet end and a liquid outlet end; a shaft core, one end of which extends into the pump casing for connection with the impeller, and the other end of the shaft core extends to the outside of the pump casing; an isolation cover, connected to the pump casing, the isolation cover having a receiving cavity, the outer wall of the pump casing cooperates with the isolation cover to make the receiving cavity in a closed state, and the portion of the shaft core exposed outside the pump casing is located in the receiving cavity; an internal magnet, which is arranged on the shaft core and located in the receiving cavity; an external magnet, which is rotatably arranged on the outer periphery of the internal magnet; wherein the shaft core sleeve is provided with a first bearing assembly and a second bearing assembly for supporting the shaft core, and the internal magnet is located between the first bearing assembly and the second bearing assembly; the isolation cover has a first mounting groove for accommodating the first bearing assembly, and the first mounting groove is located on the end of the isolation cover away from the pump casing, and the isolation cover is separately arranged in the axial direction of the shaft core and the various parts are detachably connected.

Description

Technical Field

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

[0002] A pump is a machine that transports fluid or pressurizes fluid. It transfers the mechanical energy of the prime mover or other external energy to the liquid, increasing the energy of the liquid. A bearing assembly is provided inside the pump, which is used to support the shaft core. During the operation of the pump, the shaft core drives the impeller to rotate continuously, thereby achieving the pumping of the liquid.

[0003] In the prior art, the bearing assembly is distributed toward the impeller side, resulting in a relatively stable and reliable support at the impeller, while the support performance at the inner magnetic part far from the impeller side is poor, which in turn results in a large radial runout at the inner magnetic part. Therefore, it is necessary to improve the prior art to overcome the above defects in the prior art. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to provide a pump structure with good internal magnetic support effect.

[0005] In order to solve the above technical problems, the present invention provides a pump structure, comprising: a pump casing having a hollow cavity, wherein an impeller is accommodated in the hollow cavity, and the pump casing is further provided with a liquid inlet end and a liquid outlet end, wherein the liquid inlet end and the liquid outlet end are respectively communicated with the hollow cavity; an axis core, one end of which extends into the pump casing for connection with the impeller, and the other end of the axis core extends to the outside of the pump casing; an isolation cover connected to the pump casing, the isolation cover having a receiving cavity, the outer wall of the pump casing cooperates with the isolation cover so that the receiving cavity is in a closed state, and the axis core is exposed outside the pump casing The outer part is located in the receiving cavity; the inner magnet is arranged on the shaft core and located in the receiving cavity; the outer magnet is rotatably arranged on the outer periphery of the inner magnet; wherein the shaft core sleeve is provided with a first bearing assembly and a second bearing assembly for supporting it, and the inner magnet is located between the first bearing assembly and the second bearing assembly; the isolation cover has a first mounting groove for accommodating the first bearing assembly, and the first mounting groove is located on the end of the isolation cover away from the pump casing, and the isolation cover is separately arranged in the axial direction of the shaft core and the various parts are detachably connected.

[0006] Preferably, the isolation cover comprises a cover body and a protective cover sleeved on the outer periphery of the cover body, and the cover body comprises a main body section and an end cover section detachably connected to the main body section;

[0007] The end surface of the end cover section close to the pump housing is concavely formed with the first installation groove, and the end cover section is distributed farther from the pump housing than the main body section and the protective sleeve;

[0008] The end cover section is arranged at the end of the main body section away from the pump casing side; the protective sleeve is sleeved on the outer periphery of the main body section and the end cover section.

[0009] Preferably, the main body portion is made of plastic, the internal magnet is accommodated in the main body portion, and the protective cover is made of metal, wherein the protective cover is provided with a plurality of hollow grooves extending along the axial direction of the shaft core, the hollow grooves are spaced apart in the circumferential direction of the shaft core, and the internal magnet is located in the axial extension area of ​​the hollow grooves.

[0010] Preferably, the inner peripheral wall of the main body sub-part cooperating with the end cover sub-part is provided with a first internal thread, and the outer peripheral wall of the end cover sub-part is provided with a first external thread cooperating with the first internal thread;

[0011] Among them, a second external thread adjacent to the first external thread is also provided on the outer peripheral wall of the end cover section, and a second internal thread matching the second external thread is provided on the inner peripheral wall of the protective cover. The first external thread and the second external thread have opposite rotation directions, and the second external thread is farther away from the internal magnetic distribution than the first external thread.

[0012] Preferably, the main body section comprises a cylindrical body and a flange fixed to the end of the cylindrical body close to the pump casing, wherein one end of the protective sleeve abuts against the flange, and the other end is connected to the end cover section.

[0013] Preferably, the first bearing assembly comprises a sliding bearing sleeved on the shaft core, a thrust ring is sleeved on the outer circumference of the sliding bearing, and the sliding bearing and the thrust ring are accommodated in the first mounting groove; the first bearing assembly also comprises a transition ring sleeved on the shaft core, one end of the transition ring abuts against the internal magnet, and the other end abuts against the sliding bearing and the thrust ring;

[0014] The end of the inner magnet is recessed to form a limiting groove, and the transition ring is partially located in the limiting groove and partially extends along the axial direction of the shaft core to the outside of the limiting groove to abut against the sliding bearing and the thrust ring.

[0015] Preferably, the inner ring of the thrust ring is provided with a plurality of circumferential grooves extending along the circumference of the shaft core and a plurality of axial grooves extending along the axial direction of the shaft core, and the circumferential grooves are intersecting and distributed with the axial grooves;

[0016] Wherein, the end surface of the thrust ring is also provided with a plurality of drainage grooves connected with the circumferential groove and / or the axial groove;

[0017] A spiral groove is arranged on the inner ring of the sliding bearing in contact with the shaft core, and a drainage port is arranged on the circumferential wall at the end of the sliding bearing, and the drainage port is communicated with the spiral groove.

[0018] Preferably, the first mounting groove is in the shape of a stepped groove, including a large-diameter groove close to the internal magnet and a small-diameter groove away from the internal magnet, and the sliding bearing and the thrust ring are located in the large-diameter groove;

[0019] Among them, a convex ring portion is provided at the end of the shaft core that cooperates with the first bearing assembly. The convex ring portion is distributed along the circumference of the shaft core and extends along the radial direction of the shaft core. The convex ring portion is located in the small diameter groove and abuts against the sliding bearing. There is a gap between the convex ring portion and the groove wall of the small diameter groove.

[0020] Preferably, the pump housing comprises a pump cover and a gland, the pump cover and the gland together enclose the hollow cavity for accommodating the impeller, and the pump cover is provided with the liquid inlet end and the liquid outlet end;

[0021] The gland is provided with a first flow channel, the first flow channel connects the hollow cavity and the receiving cavity, and a drainage cone surface is formed on the end surface of the isolation cover opposite to the first flow channel, and the drainage cone surface is configured to drain the liquid flowing out of the first flow channel into the receiving cavity, wherein the aperture of the drainage cone surface is gradually reduced in the direction from the impeller to the internal magnet;

[0022] The shaft core has a central hole extending therethrough in the axial direction, and the central hole communicates with the hollow cavity of the pump housing and the receiving cavity.

[0023] Preferably, a connecting hole is further provided on the circumferential wall surface of the shaft core corresponding to the first bearing assembly and the second bearing assembly, and the connecting hole is configured to form a liquid flow path between the first bearing assembly, the second bearing assembly and the center hole;

[0024] Wherein, a deceleration structure is also provided in the central hole. The deceleration structure is distributed closer to the impeller side than the connecting hole. The deceleration structure is constructed to reduce the aperture of the central hole.

[0025] The technical solution provided by the present invention has the following advantages:

[0026] In the present invention, the first bearing assembly is arranged on the end of the isolation cover away from the pump casing, and the first bearing assembly and the second bearing assembly are distributed at both ends of the internal magnet. The internal magnet can obtain more stable and reliable support, which can effectively reduce the radial runout at the internal magnet and greatly reduce the noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the three-dimensional structure of the pump structure provided by the present invention;

[0029] Figure 2 A schematic diagram of the exploded structure of the pump structure provided by the present invention;

[0030] Figure 3 A schematic diagram of the cross-sectional structure of the pump structure provided by the present invention in the longitudinal direction;

[0031] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of the A area in the middle;

[0032] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of the middle B area;

[0033] Figure 6 A schematic diagram of a cross-sectional structure of a pump structure provided by the present invention in the transverse direction;

[0034] Figure 7 It is a schematic diagram of the positional relationship between the first bearing assembly, the second bearing assembly, and the internal magnet;

[0035] Figure 8 is a schematic diagram of the isolation cover at a first viewing angle;

[0036] Fig. 9 is a schematic diagram of the isolation cover at a second viewing angle;

[0037] Fig.10 It is a schematic diagram of the exploded structure of part of the isolation cover;

[0038] Fig.11 The figure is a schematic diagram of the exploded structure of the isolation cover;

[0039] Fig.12 It is a schematic diagram of the cross-sectional structure of the end cover section;

[0040] Fig.13 It is a schematic diagram of the cross-section structure of the main part;

[0041] Fig.14 It is a schematic diagram of the structure of the protective cover;

[0042] Fig.15 A schematic diagram of the thrust ring in the first perspective;

[0043] Fig.16 A schematic diagram of the thrust ring in a second viewing angle;

[0044] Fig.17 It is a structural schematic diagram of a sliding bearing;

[0045] Fig.18 It is a schematic diagram of the cross-sectional structure of the shaft core;

[0046] Fig.19 It is a schematic diagram of the structure of the gland. DETAILED DESCRIPTION

[0047] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0048] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0049] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0050] like Figures 1 to 7 As shown, the present invention provides a pump structure for conveying liquid media. The pump structure includes: a pump housing 100, an impeller 200, a shaft core 300, an isolation cover 400, an internal magnet 500, an external magnet 600 and a motor 800. The isolation cover 400 is connected to the pump housing 100, and the motor 800 is connected to the pump housing 100 through a bracket 810, and the bracket 810 is arranged around the outer periphery of the isolation cover 400, wherein the external magnet 600 is located outside the isolation cover 400 and inside the bracket 810, and the internal magnet 500 is located inside the isolation cover 400. The motor 800 is drivingly connected to the external magnet 600, and under the action of the motor 800, the external magnet 600 rotates around the outer periphery of the internal magnet 500. The inner magnet 500 is disposed on the shaft core 300 . The inner magnet 500 drives the shaft core 300 to rotate under the action of the outer magnet 600 . The impeller 200 is fixed on the shaft core 300 . When the shaft core 300 rotates, the impeller 200 rotates synchronously with the shaft core 300 .

[0051] The pump housing 100 and the isolation cover 400 are preferably detachably connected, for example, by fasteners such as bolts and screws. Of course, the pump housing 100 and the isolation cover 400 can also be fixedly connected, for example, by welding.

[0052] The pump housing 100 has a hollow cavity, and the impeller 200 is housed in the hollow cavity. In this embodiment, the pump housing 100 is disposed in a split manner in the axial direction of the shaft core 300, such as Figure 7 As shown, the pump housing 100 includes a pump cover 110 and a gland 120, which are jointly arranged to form a hollow cavity for accommodating the impeller 200, wherein the pump cover 110 is provided with a liquid inlet end 111 and a liquid outlet end 112, which are respectively connected to the hollow cavity. The axis of the liquid inlet end 111 is coaxially distributed with the shaft core 300, and the liquid outlet direction of the liquid outlet end 112 is perpendicular to the liquid inlet direction of the liquid inlet end 111.

[0053] One end of the shaft core 300 extends into the pump housing 100 for connection with the impeller 200, and the other end of the shaft core 300 extends to the outside of the pump housing 100. Figure 6 As shown, the isolation cover 400 has a receiving cavity 401, and the portion of the shaft core 300 exposed outside the pump housing 100 is located in the receiving cavity 401. The outer wall of the gland 120 away from the impeller 200 side cooperates with the isolation cover 400 to make the receiving cavity 401 in a closed state. It can also be understood that the gland 120 is arranged on the opening side of the isolation cover 400 to close the receiving cavity 401. The internal magnet 500 is located in the receiving cavity 401. The purpose of making the receiving cavity 401 in a closed state is to prevent the liquid entering the isolation cover 400 from leaking into the external environment.

[0054] The shaft core 300 is sleeved with a first bearing assembly 700 and a second bearing assembly 710 for supporting the shaft core 300, the internal magnet 500 is located between the first bearing assembly 700 and the second bearing assembly 710, and the impeller 200 is distributed close to the second bearing assembly 710 and is located on the side of the second bearing assembly 710 away from the first bearing assembly 700. The first bearing assembly 700 is arranged in the isolation cover 400. The second bearing assembly 710 is arranged on the gland 120, specifically, the gland 120 is provided with a through hole for the shaft core 300 to pass through, and the second bearing assembly 710 is accommodated in the above-mentioned through hole.

[0055] In this embodiment, the first bearing assembly 700 and the second bearing assembly 710 are distributed at both ends of the inner magnet 500, so that the inner magnet 500 can be supported more stably and reliably, which can effectively reduce the radial runout at the inner magnet 500 and greatly reduce noise.

[0056] like Figures 8 to 14As shown, the isolation cover 400 has a first installation groove 430 for accommodating the first bearing assembly 700, and the first installation groove 430 is located at the end of the isolation cover 400 away from the pump housing 100. In order to facilitate the installation of the first bearing assembly 700, the isolation cover 400 is divided into two parts in the axial direction of the shaft core 300, and each part is detachably connected.

[0057] The isolation cover 400 includes a cover body 410 and a protective cover 420 sleeved on the outer periphery of the cover body 410. The cover body 410 includes a main body section 411 and an end cover section 412 detachably connected to the main body section 411. The end cover section 412 is arranged at the end of the main body section 411 away from the pump housing 100, and is distributed farther from the pump housing 100 than the main body section 411 and the protective cover 420. The end surface of the end cover section 412 close to the pump housing 100 is recessed to form the above-mentioned first mounting groove 430. The protective cover 420 is sleeved on the outer periphery of the main body section 411 and the end cover section 412, and the projection of the protective cover 420 along the radial direction of the shaft core 300 partially overlaps with the main body section 411 and the end cover section 412.

[0058] Considering that the isolation cover 400 is a pressure-bearing part, the structural strength of the cover body 410 can be effectively enhanced by providing the protective cover 420. Furthermore, in order to reduce the magnetic eddy current loss of the isolation cover 400 and improve the heat dissipation effect of the isolation cover 400, the main body section 411 is made of plastic, the protective cover 420 is made of metal, and the internal magnet 500 is accommodated in the main body section 411. The end cover section 412 can be made of plastic material or metal material.

[0059] Among them, Fig.10 and Fig.14 As shown, the protective cover 420 is provided with a plurality of hollow grooves 421 extending along the axial direction of the shaft core 300, and the hollow grooves 421 are spaced apart in the circumferential direction of the shaft core 300. The inner magnet 500 is located in the axial extension area of ​​the hollow grooves 421. The hollow grooves 421 are intermittently arranged in the circumferential direction, which can reduce the effective area of ​​the metal material, thereby achieving the purpose of reducing the magnetic eddy current loss. At the same time, the protective cover 420 made of metal material has good thermal conductivity, which can quickly conduct the heat on the cover body 410 to the external environment, and the heat dissipation effect is good.

[0060] like Fig.10 and Fig.13 As shown, the main body section 411 includes a cylindrical body 4111 and a flange 4112 fixed at the end of the cylindrical body 4111 close to the pump housing 100. Preferably, the cylindrical body 4111 and the flange 4112 are integrally formed, and the flange 4112 is connected to the gland 120. One end of the protective sleeve 420 abuts against the flange 4112, and the other end is connected to the end cover section 412.

[0061] In this embodiment, if Figure 5 , Fig.12 and Fig.13 As shown, the inner circumferential wall of the cylindrical body 4111 of the main body section 411 that cooperates with the end cover section 412 is provided with a first internal thread 413, and the outer circumferential wall of the end cover section 412 is provided with a first external thread 414 that cooperates with the first internal thread 413. The end cover section 412 is detachably arranged on the cylindrical body 4111 of the main body section 411 through the cooperation between the first internal thread 413 and the first external thread 414.

[0062] Furthermore, if Figure 5 and Fig.12 As shown, a second external thread 415 is also provided on the outer peripheral wall of the end cover section 412 and is adjacent to the first external thread 414. The second external thread 415 is farther away from the internal magnet 500 than the first external thread 414. The adjacent distribution of the first external thread 414 and the second external thread 415 means that the end of the first external thread 414 away from the internal magnet 500 abuts against the end of the second external thread 415 close to the internal magnet 500.

[0063] like Fig.14 As shown, the inner wall of the protective sleeve 420 is provided with a second internal thread 416 that cooperates with the second external thread 415. The protective sleeve 420 is detachably arranged on the end cover section 412 through the cooperation between the second external thread 415 and the second internal thread 416. The first external thread 414 and the second external thread 415 have opposite rotation directions.

[0064] After the end cap section 412 is threadedly connected to the main body section 411, and the protective cover 420 is threadedly connected to the end cap section 412, if the end cap section 412 is to be removed from the main body section 411, the end cap section 412 is screwed in the first direction. However, since the first external thread 414 and the second external thread 415 have opposite rotation directions, when the end cap section 412 is screwed in the first direction, the protective cover 420 will be screwed tighter on the end cap section 412. Therefore, the end cap section 412 is not easily dropped from the main body section 411 by external force, which effectively ensures the stability and reliability of the connection between the main body section 411 and the end cap section 412, and solves the connection problem between the protective cover 420 and the cover body 410.

[0065] In this embodiment, the first bearing assembly 700 and the second bearing assembly 710 have the same structure. The first bearing assembly 700 is used as an example for explanation. Figure 4 and Figure 6 As shown, the first bearing assembly 700 includes a sliding bearing 702 sleeved on the shaft core 300 , a thrust ring 703 is sleeved on the outer periphery of the sliding bearing 702 , and both the sliding bearing 702 and the thrust ring 703 are received in the first installation groove 430 .

[0066] The first bearing assembly 700 further includes a transition ring 701 sleeved on the shaft core 300, one end of the transition ring 701 abuts against the inner magnet 500, and the other end abuts against the sliding bearing 702 and the thrust ring 703. The end of the inner magnet 500 is recessed to form a limiting groove 510, and part of the transition ring 701 is located in the limiting groove 510 and partly extends along the axial direction of the shaft core 300 to the outside of the limiting groove 510 to abut against the sliding bearing 702 and the thrust ring 703. The transition ring 701 is used to prevent the sliding bearing 702 and the thrust ring 703 from contacting the inner magnet 500, so as to ensure the working environment of the inner magnet 500 and extend the service life of the inner magnet 500.

[0067] In order to ensure that the liquid can enter between the sliding bearing 702 and the shaft core 300 and reduce the heat generated by the friction between the shaft core 300 and the sliding bearing 702 when the shaft core 300 rotates, the inner ring of the thrust ring 703 and the inner ring of the sliding bearing 702 are both provided with grooves for liquid circulation.

[0068] Specifically, Fig.15 and Fig.16 As shown, the inner ring of the thrust ring 703 is provided with a plurality of circumferential grooves 705 extending along the circumference of the shaft core 300 and a plurality of axial grooves 704 extending along the axial direction of the shaft core 300. The circumferential grooves 705 intersect and are distributed with the axial grooves 704. Thus, the liquid in the axial grooves 704 can flow into the circumferential grooves 705. Similarly, the liquid in the circumferential grooves 705 can also flow toward the axial grooves 704, thereby realizing the circulation of the liquid.

[0069] In order to allow the liquid in the receiving cavity 401 to smoothly enter the inner ring of the thrust ring 703, a plurality of drainage grooves 706 extending in the radial direction are further provided on the end surface of the thrust ring 703, and the plurality of drainage grooves 706 are spaced apart in the circumferential direction. The drainage grooves 706 may be connected only to the circumferential groove 705, or only to the axial groove 704, or may be connected to the circumferential groove 705 and the axial groove 704 at the same time.

[0070] like Fig.17 As shown, a spiral groove 707 is provided on the inner ring of the sliding bearing 702 in contact with the shaft core 300, and a drainage port 708 is provided on the circumferential wall at the end of the sliding bearing 702, and the drainage port 708 is connected with the spiral groove 707. The liquid in the receiving cavity 401 can smoothly enter the spiral groove 707 through the drainage port 708. The spiral groove 707 provides a circulation channel for the liquid on the one hand, and extends the flow path of the liquid on the other hand, so that the liquid can fully take away the heat of the outer peripheral surface of the shaft core 300 and the inner ring of the sliding bearing 702, and the cooling and temperature reduction effect is good, and the shaft core 300 and the sliding bearing 702 can be fully lubricated at the same time.

[0071] In this embodiment, if Fig.12As shown, the first mounting groove 430 is in the shape of a stepped groove, including a large diameter groove 431 close to the inner magnet 500 and a small diameter groove 432 away from the inner magnet 500, and the large diameter groove 431 and the small diameter groove 432 are coaxially distributed, wherein the sliding bearing 702 and the thrust ring 703 are located in the large diameter groove 431.

[0072] A groove shoulder 433 is formed between the large diameter groove 431 and the small diameter groove 432, and the thrust ring 703 abuts against the groove shoulder. In order to achieve the position limiting of the thrust ring 703, a first slot 709 is formed on the end surface of the thrust ring 703 away from the transition ring 701 along the axial concave, and the groove shoulder 433 is provided with a second slot 417 corresponding to the first slot 709. A limiting pin (not shown) is inserted in the first slot 709 and the second slot 417, and the thrust ring 703 is limited by the cooperation between the limiting pin and the first slot 709 and the second slot 417.

[0073] Furthermore, if Fig.18 As shown, the end of the shaft core 300 that cooperates with the first bearing assembly 700 is provided with a convex ring portion 310, which is distributed along the circumference of the shaft core 300 and extends along the radial direction of the shaft core 300. The convex ring portion 310 is located in the small-diameter groove 432 and abuts against the sliding bearing 702. There is a gap between the convex ring portion 310 and the groove wall of the small-diameter groove 432, and the above-mentioned "gap" is used to provide a circulation space for liquid.

[0074] In this embodiment, the liquid can circulate between the pump housing 100 and the isolation cover 400. Specifically, Fig.19 As shown, the gland 120 is provided with a first flow channel 121, which connects the hollow cavity of the pump housing 100 with the receiving cavity 401, and the liquid in the pump housing 100 enters the receiving cavity 401 of the isolation cover 400 through the first flow channel 121. Fig.18 As shown, the shaft core 300 has a central hole 320 extending therethrough in the axial direction, and the central hole 320 connects the hollow cavity of the pump housing 100 with the receiving cavity 401. As can be seen from the above, the liquid can circulate through the first flow channel 121 and the central hole 320 of the shaft core 300.

[0075] Furthermore, a connecting hole 330 is further provided on the circumferential wall surface of the shaft core 300 corresponding to the first bearing assembly 700 and the second bearing assembly 710, and the connecting hole 330 is used to form a liquid flow path between the first bearing assembly 700, the second bearing assembly 710 and the center hole 320. The hole diameter of the connecting hole 330 is smaller than the hole diameter of the center hole 320.

[0076] A deceleration structure 340 is also provided in the center hole 320. The deceleration structure 340 is distributed closer to the impeller 200 side than the connecting hole 330, and is used to reduce the aperture of the center hole 320. The deceleration structure 340 is distributed close to the liquid outlet of the center hole 320, so that the aperture at the liquid outlet of the center hole 320 becomes smaller, which is used to limit the flow, so that the liquid in the receiving chamber 401 can fully flow through the inner ring of the thrust ring 703, the inner ring of the sliding bearing 702 and various gaps, which is conducive to lubrication and cooling. In one embodiment, the deceleration structure 340 is a hole shoulder. Of course, the deceleration structure 340 includes but is not limited to a hole shoulder, and can also be a tapered hole or a tapered hole group formed by a combination of multiple tapered holes.

[0077] The first flow channel 121 has an inlet and an outlet. The inlet of the first flow channel 121 is close to the periphery of the impeller 200. The periphery of the impeller is a high-pressure area. Under the action of high pressure, the liquid can quickly enter the receiving chamber 401. The outlet of the first flow channel 121 is closer to the center of the impeller 200 than the inlet of the first flow channel 121. In other words, the first flow channel 121 is inclined relative to the shaft core 300, and there is an acute angle between the first flow channel 121 and the shaft core 300.

[0078] In order to reduce the flow resistance of the liquid, Fig.13 As shown, a drainage cone 402 is formed on the end surface of the isolation cover 400 opposite to the first flow channel 121, and the drainage cone 402 is configured to drain the liquid flowing out of the first flow channel 121 into the receiving chamber 401. The drainage cone 402 is formed on the end surface of the flange 4112 opposite to the gland 120. In the direction from the impeller 200 to the inner magnet 500, the aperture of the drainage cone 402 is gradually reduced, and the opening end of the receiving chamber 401 is the place where the aperture of the drainage cone 402 is the smallest.

[0079] When the impeller 200 rotates, the high-pressure liquid at the edge of the impeller 200 flows into the first flow channel 121 through the inlet of the first flow channel 121, and flows to the drainage cone 402 through the outlet of the first flow channel 121. Under the drainage of the drainage cone 402, the liquid converges into the receiving chamber 401. The liquid in the receiving chamber 401 passes through the gap between the components and enters the center hole 320. After being decelerated by the center hole 320, it finally flows back to the hollow cavity of the pump casing 100.

[0080] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, ordinary technicians in this field can make other different forms of changes or modifications without creative work, which should fall within the scope of protection of the present invention.

Claims

1. A pump structure, characterized in that: include: A pump casing (100) having a hollow cavity, wherein an impeller (200) is accommodated in the hollow cavity; the pump casing (100) is further provided with a liquid inlet end (111) and a liquid outlet end (112), wherein the liquid inlet end (111) and the liquid outlet end (112) are respectively connected to the hollow cavity; An axis core (300), one end of which extends into the pump casing (100) for connection with the impeller (200), and the other end of which extends to the outside of the pump casing (100); an isolation cover (400) connected to the pump housing (100), the isolation cover (400) having a receiving cavity (401), the outer wall of the pump housing (100) cooperating with the isolation cover (400) so that the receiving cavity (401) is in a closed state, and the portion of the shaft core (300) exposed outside the pump housing (100) is located inside the receiving cavity (401); An internal magnet (500) is disposed on the shaft core (300) and is located in the receiving cavity (401); An external magnet (600) rotatably disposed on the outer periphery of the internal magnet (500); The shaft core (300) is sleeved with a first bearing assembly (700) and a second bearing assembly (710) for supporting the shaft core, and the internal magnet (500) is located between the first bearing assembly (700) and the second bearing assembly (710); The isolation cover (400) has a first installation groove (430) for accommodating the first bearing assembly (700), the first installation groove (430) being located at an end of the isolation cover (400) away from the pump housing (100), the isolation cover (400) being arranged in separate parts in the axial direction of the shaft core (300), and the respective parts being detachably connected; The isolation cover (400) comprises a cover body (410) and a protective cover (420) sleeved on the outer periphery of the cover body (410); the cover body (410) comprises a main body section (411) and an end cover section (412) detachably connected to the main body section (411); The first installation groove (430) is formed in a depression on the end surface of the end cover section (412) close to the pump housing (100), and the end cover section (412) is located farther from the pump housing (100) than the main body section (411) and the protective sleeve (420); The end cover section (412) is arranged at the end of the main body section (411) away from the pump housing (100); the protective sleeve (420) is sleeved on the outer circumference of the main body section (411) and the end cover section (412); The inner peripheral wall of the main body section (411) and the end cover section (412) is provided with a first internal thread (413), and the outer peripheral wall of the end cover section (412) is provided with a first external thread (414) that matches the first internal thread (413); The outer peripheral wall of the end cover section (412) is also provided with a second external thread (415) adjacent to the first external thread (414); the inner peripheral wall of the protective sleeve (420) is provided with a second internal thread (416) matching the second external thread (415); the first external thread (414) and the second external thread (415) have opposite rotation directions; the second external thread (415) is distributed farther from the internal magnet (500) than the first external thread (414).

2. The pump structure according to claim 1, characterized in that: The main body section (411) is made of plastic, the internal magnet (500) is accommodated in the main body section (411), and the protective cover (420) is made of metal, wherein the protective cover (420) is provided with a plurality of hollow grooves (421) extending along the axial direction of the shaft core (300), the hollow grooves (421) are spaced apart in the circumferential direction of the shaft core (300), and the internal magnet (500) is located in the axial extension area of ​​the hollow grooves (421).

3. The pump structure according to claim 1, characterized in that: The main body section (411) comprises a cylindrical body (4111) and a flange (4112) fixedly mounted at an end of the cylindrical body (4111) close to the pump housing (100), wherein one end of the protective sleeve (420) abuts against the flange (4112) and the other end is connected to the end cover section (412).

4. The pump structure according to claim 1, characterized in that The first bearing assembly (700) comprises a sliding bearing (702) sleeved on the shaft core (300), a thrust ring (703) sleeved on the outer periphery of the sliding bearing (702), and the sliding bearing (702) and the thrust ring (703) are accommodated in the first installation groove (430); The first bearing assembly (700) further comprises a transition ring (701) sleeved on the shaft core (300), one end of the transition ring (701) abutting against the inner magnet (500), and the other end abutting against the sliding bearing (702) and the thrust ring (703); The end of the inner magnet (500) is recessed to form a limiting groove (510), and the transition ring (701) is partially located in the limiting groove (510) and partially extends along the axial direction of the shaft core (300) to the outside of the limiting groove (510) to abut against the sliding bearing (702) and the thrust ring (703).

5. The pump structure according to claim 4, characterized in that: The inner ring of the thrust ring (703) is provided with a plurality of circumferential grooves (705) extending along the circumference of the shaft core (300) and a plurality of axial grooves (704) extending along the axial direction of the shaft core (300), wherein the circumferential grooves (705) and the axial grooves (704) are intersectingly distributed; Wherein, the end surface of the thrust ring (703) is further provided with a plurality of drainage grooves (706) communicating with the circumferential groove (705) and / or the axial groove (704); A spiral groove (707) is provided on the inner ring of the sliding bearing (702) in contact with the shaft core (300), and a drainage port (708) is provided on the circumferential wall at the end of the sliding bearing (702), and the drainage port (708) is communicated with the spiral groove (707).

6. The pump structure according to claim 4, characterized in that The first mounting groove (430) is in the shape of a stepped groove, comprising a large-diameter groove (431) close to the internal magnet (500) and a small-diameter groove (432) away from the internal magnet (500), and the sliding bearing (702) and the thrust ring (703) are located in the large-diameter groove (431); The end of the shaft core (300) that cooperates with the first bearing assembly (700) is provided with a convex ring portion (310), the convex ring portion (310) is distributed along the circumference of the shaft core (300) and extends along the radial direction of the shaft core (300), the convex ring portion (310) is located in the small-diameter groove (432) and abuts against the sliding bearing (702), and there is a gap between the convex ring portion (310) and the groove wall of the small-diameter groove (432).

7. The pump structure according to claim 1, characterized in that The pump housing (100) comprises a pump cover (110) and a gland (120), wherein the pump cover (110) and the gland (120) together enclose the hollow cavity for accommodating the impeller (200), and the pump cover (110) is provided with the liquid inlet end (111) and the liquid outlet end (112); The gland (120) is provided with a first flow channel (121), the first flow channel (121) connecting the hollow cavity and the receiving cavity (401), and a drainage cone surface (402) is formed on the end surface of the isolation cover (400) opposite to the first flow channel (121), the drainage cone surface (402) being configured to drain liquid flowing out of the first flow channel (121) into the receiving cavity (401), wherein the aperture of the drainage cone surface (402) is gradually reduced in the direction from the impeller (200) to the internal magnet (500); The shaft core (300) has a central hole (320) extending therethrough in the axial direction, and the central hole (320) communicates with the hollow cavity of the pump housing (100) and the receiving cavity (401).

8. The pump structure according to claim 7, characterized in that A connecting hole (330) is further provided on the circumferential wall surface of the shaft core (300) corresponding to the first bearing assembly (700) and the second bearing assembly (710), and the connecting hole (330) is configured to form a liquid flow path between the first bearing assembly (700), the second bearing assembly (710) and the center hole (320); A deceleration structure (340) is further provided in the central hole (320); the deceleration structure (340) is distributed closer to the impeller (200) than the connecting hole (330); and the deceleration structure (340) is configured to reduce the aperture of the central hole (320).

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