Mounting structure of shaftless magnetic drive pump

Abstract

The utility model provides an installation structure of a shaftless magnetic drive pump, and belongs to the technical field of pumps. The technical problems of supporting and fixing of a rotor assembly and an impeller of an existing shaftless magnetic drive pump and the like are solved. An installation structure of a shaftless magnetic drive pump comprises a pump shell, a motor shell, a rotor assembly, a stator assembly and an impeller, the stator assembly is fixed between the pump shell and the motor shell, a pump cavity is formed between the stator assembly and the pump shell, a motor cavity is formed between the stator assembly and the motor shell, and the pump cavity and the motor cavity are not communicated. A concave cavity with an opening facing the pump cavity is further formed in the middle of the stator assembly, the rotor assembly is embedded into the concave cavity and rotates relative to the stator assembly through the first rotating assembly and the second rotating assembly, the rotor assembly is provided with an installation through hole consistent with the center axis of the rotor assembly, and the upper end of the installation through hole is fixedly connected with an impeller. The device is more convenient to install and more stable in operation.

Description

Technical Field

[0001] The utility model belongs to the technical field of pumps, and particularly refers to an installation structure of a shaftless magnetic pump. Background Art

[0002] In the magnetic pumps in the prior art, generally, the impeller and the rotor are respectively fixed at both ends of the rotating shaft. Such a structure requires an additional intermediate support structure for the rotating shaft, but it increases the axial length of the pump, and it is not easy to install the impeller without the support of the rotating shaft. Nowadays, in order to better install the impeller in the shaftless magnetic pump, such as the shaftless sealed circulating pump in Chinese Patent No. 2015104388345, the rotor and the impeller are fixedly connected. The upper magnetic ring and the lower magnetic ring are arranged with the same poles facing each other. The lower magnetic ring is fixed in the lower cavity. The repulsive force generated between the upper magnetic ring and the lower magnetic ring pushes the upper magnetic ring and the rotor upward. A positioning mechanism is fixedly connected in the lower cavity to limit the height of the impeller. However, this structure is complex and requires the repulsive force between the upper magnetic ring and the lower magnetic ring to support the rotation of the impeller, and the rotation stability is poor. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide an installation structure of a shaftless magnetic pump. The technical problem to be solved by the utility model is how to make the installation of the shaftless magnetic pump convenient and the operation stable.

[0004] The purpose of the utility model can be realized by the following technical solutions: An installation structure of a shaftless magnetic pump, including a pump housing, a motor housing, a rotor assembly, a stator assembly and an impeller. The stator assembly is fixed between the pump housing and the motor housing. A pump cavity is formed between the stator assembly and the pump housing, and a motor cavity is formed between the stator assembly and the motor housing. The pump cavity and the motor cavity are not communicated with each other. The middle part of the stator assembly also has a concave cavity with an opening facing the pump cavity. The rotor assembly is embedded in the concave cavity and rotates relative to the stator assembly through a first rotating component and a second rotating component. The rotor assembly has an installation through hole consistent with the central axis of the rotor assembly, and an impeller is fixedly connected to the upper end of the installation through hole.

[0005] This solution has no rotating shaft for support. By setting a concave cavity with the same central axis as the stator assembly in the middle of the stator assembly to install the rotor assembly, an inner rotor magnetic pump without a rotating shaft is formed. The rotor assembly realizes relative rotation with the stator rotor through the first rotating component and the second rotating component. The rotor assembly can be completely embedded in the concave cavity, and the first rotating component and the second rotating component are arranged between the rotor assembly and the stator assembly to form a function that can combine positioning and relative rotation, ensuring that there is a relative gap between the rotor assembly and the stator assembly to maintain relative rotation. Furthermore, an installation through-hole consistent with the central axis of the rotor assembly is set on the rotor assembly, and an impeller is fixedly connected to the upper end of the installation through-hole, so that the impeller, the rotor assembly, and the stator assembly have a stable and consistent rotation axis, making the rotation of the rotor assembly driving the impeller more stable. This solution reduces the axial distance of the whole machine, makes the installation more convenient, and the operation more stable.

[0006] Further, both ends of the inner peripheral surface of the concave cavity respectively have a first installation groove and an installation convex ring. The inner peripheral surface diameter of the first installation groove is greater than the inner peripheral surface diameter of the concave cavity, which is greater than the inner peripheral surface diameter of the installation convex ring. Both ends of the outer peripheral surface of the rotor assembly respectively have a second installation groove and a third installation groove. A first rotating component is fixedly arranged between the first installation groove and the second installation groove, and a second rotating component is fixedly arranged between the installation convex ring and the third installation groove. There is a rotating gap between the outer peripheral surface of the rotor assembly and the inner peripheral surface of the concave cavity.

[0007] Fixing the first rotating component in the first installation groove and the second installation groove, and fixing the second rotating component in the installation convex ring and the third installation groove can reduce the gap distance between the stator assembly and the rotor assembly, and further reduce the distance between the stator assembly wrapped in the stator assembly and the rotor assembly wrapped in the rotor assembly. The first rotating component and the second rotating component can support the rotation of the rotor assembly relative to the stator assembly, and can also be fixed in the radial direction between the rotor assembly and the stator assembly to prevent its radial shaking, making the relative rotation of the rotor assembly and the stator assembly more stable within a smaller gap distance, and making the performance of the shaftless magnetic pump better.

[0008] Further, an annular part one and an annular part two protrude from the lower end of the impeller. The annular part one and the annular part two are arranged in a stepped shape. The lower end surface of the annular part one abuts against the upper end surface of the rotor assembly, and the outer peripheral surface of the annular part two abuts against the inner peripheral surface of the concave cavity. While ensuring the fixation of the impeller and the rotor assembly, it does not touch the stator assembly. The annular part one and the annular part two make the impeller and the rotor assembly keep the central axis consistent, making the rotation of the impeller smoother. Among them, the above-mentioned impeller can be set separately or integrally formed with the rotor assembly.

[0009] Further, several clamping blocks protruding inward are provided at the upper end of the installation through-hole. A guiding surface is provided at the upper part of the clamping blocks. Several elastic plates protrude towards the rotor assembly from the annular second part. The outer peripheral surface diameter of the elastic plates is smaller than the outer peripheral surface diameter of the annular second part. A clamping hole for clamping the clamping blocks is provided on the elastic plates. The radial movement of the impeller and the rotor assembly is restricted by the annular first part and the annular second part. After the clamping holes on the elastic plates are clamped and fixed with the clamping blocks, the axial and circumferential movement of the impeller relative to the rotor assembly is restricted, and the impeller is better fixed. The detachable impeller is convenient for manufacturing and processing.

[0010] Further, an flared groove with a diameter larger than that of the installation through-hole is provided at the upper part of the installation through-hole. The clamping blocks are formed on the inner peripheral surface of the flared groove. Several convex blocks are also formed on the inner peripheral surface of the flared groove. Several fixing plates protrude towards the rotor assembly from the lower part of the impeller. A fixing groove for cooperating with the convex blocks is provided on the fixing plates. The upper part of the fixing groove passes through the annular second part and abuts against the lower end surface of the annular first part.

[0011] The use of the flared groove can increase the outer diameter of the elastic plates relative to the impeller. The outer peripheral surfaces of several elastic plates are arc surfaces. The larger the outer diameter of several elastic plates, the more stable the impeller rotates relative to the rotor assembly. The upper part of the fixing groove passes through the annular second part and abuts against the lower end surface of the annular first part, so that the upper end surface of the convex block abuts against the lower end surface of the annular first part, reducing the axial distance of the whole machine.

[0012] Further, a convex block is provided between two adjacent clamping blocks. The clamping blocks and the convex blocks protrude from the inner peripheral surface of the flared groove and are not connected. A fixing plate is provided between two adjacent elastic plates. The elastic plates and the fixing plates are independently suspended. The elastic plates independently suspended below the impeller have a certain elastic tendency and can be better press-fitted and fixed with the convex blocks.

[0013] Further, a stepped ring part one protruding outward is provided on the outer periphery of the stator assembly. A stepped ring part two fixedly matched with the stepped ring part one is provided at the lower end of the pump housing. An annular baffle protrudes downward from the outer periphery of the stepped ring part two. The outer peripheral surface of the stepped ring part one abuts against the inner peripheral surface of the annular baffle. The setting of the annular baffle can better position and install the stator assembly and reduce the radial shaking of the stator assembly.

[0014] Further, an annular part protrudes outward from the upper end of the motor housing. The upper end surface of the annular part abuts against the lower end surface of the stepped ring part one. The outer peripheral surface of the annular part abuts against the inner peripheral surface of the annular baffle. The lower part of the stator assembly abuts against the inner peripheral surface of the motor housing. The same annular baffle is used to position and install the motor housing, making the stator assembly more stable.

[0015] Furthermore, the rotor assembly is an integrally injection-molded part, and the stator assembly is an integrally injection-molded part or an integrally formed part after being separately formed and then assembled and fixed. The rotor assembly includes a rotor shielding sleeve and a rotor assembly, and the rotor shielding sleeve and the rotor assembly are integrally injection-molded. The rotor assembly is arranged around the mounting through-hole. The stator assembly includes a stator shielding sleeve and a stator assembly. The stator shielding sleeve has a closed annular accommodation cavity and a concave cavity. The stator assembly is located in the accommodation cavity, and the rotor assembly is located in the concave cavity. The stator shielding sleeve can be designed separately. The stator shielding sleeve can include a shielding sleeve one and a shielding sleeve two. The shielding sleeve one and the shielding sleeve two are fixed by bolts. The concave cavity is formed on the shielding sleeve one. The shielding sleeve two and the shielding sleeve one enclose to form a closed annular accommodation cavity. The shielding sleeve one and the shielding sleeve two are fixed to the housing by bolts. The stator shielding sleeve can be integrally designed. The stator shielding sleeve and the stator assembly are integrally injection-molded, and the stator assembly is fixed to the housing by bolts.

[0016] Furthermore, the first rotating assembly includes a first ceramic sleeve and a first silicon carbide sleeve sleeved outside the first ceramic sleeve. The first silicon carbide sleeve is fixed in the first mounting groove, and the first ceramic sleeve is fixed in the second mounting groove. The outer peripheral surface of the first ceramic sleeve is in smooth sliding fit with the inner peripheral surface of the first silicon carbide sleeve. The second rotating assembly includes a second ceramic sleeve, a second silicon carbide sleeve sleeved outside the second ceramic sleeve, and a thrust plate located below the second ceramic sleeve and the second silicon carbide sleeve. The second silicon carbide sleeve is fixed in the mounting convex ring, the second ceramic sleeve is fixed in the third mounting groove, a flow channel groove two is arranged on the inner peripheral surface of the second silicon carbide sleeve, the outer peripheral surface of the second ceramic sleeve is in smooth sliding fit with the inner peripheral surface of the second silicon carbide sleeve, and the lower end surface of the second ceramic sleeve is in smooth sliding fit with the upper end surface of the thrust plate.

[0017] Compared with the prior art, the technical effects of the present utility model are as follows: First, there is no need to support the rotation of the rotor assembly and the impeller through a rotating shaft, and the first rotating assembly and the second rotating assembly are arranged between the rotor assembly and the stator assembly. By setting the first mounting groove and the mounting convex ring, the second mounting groove and the third mounting groove to fix and install the first rotating assembly and the second rotating assembly, the relative rotation of the rotor assembly and the impeller with respect to the stator assembly is more stable, and the constant radial rotation gap between the rotor assembly and the stator assembly is maintained, reducing the shaking of the rotor assembly and making the whole machine operate more stably. Second, the detachable impeller is more convenient for processing and installation. Third, the annular baffle integrally formed by the pump casing can better install the stator assembly. Description of the Drawings

[0018] Figure 1 It is a sectional view of the present utility model.

[0019] Figure 2 It is an enlarged view taken along line A-A of the present utility model.

[0020] Figure 3 It is a three-dimensional view of the stator assembly of the present utility model.

[0021] Figure 4 It is a three-dimensional view of the rotor assembly of the present utility model.

[0022] Figure 5 It is a three-dimensional view of the impeller of the present utility model.

[0023] Figure 6 It is a cross-sectional view of the impeller and rotor assembly of the present utility model.

[0024] Drawing number markings:

[0025] 1. Pump housing; 101. Second stepped ring part; 102. Annular baffle;

[0026] 2. Motor housing; 201. Annular part;

[0027] 3. Rotor assembly; 301. Installation through hole; 302. Second installation groove; 303. Third installation groove; 304. Block; 305. Flared groove; 306. Protrusion;

[0028] 4. Stator assembly; 401. Concave cavity; 402. First installation groove; 403. Installation convex ring; 404. First stepped ring part;

[0029] 5. Impeller; 501. First annular part; 502. Second annular part; 503. Elastic plate; 504. Card hole; 505. Fixed plate; 506. Fixed groove;

[0030] 6. Pump cavity;

[0031] 7. Motor cavity;

[0032] 8. First rotating assembly; 801. First ceramic sleeve; 802. First silicon carbide sleeve;

[0033] 9. Second rotating assembly; 901. Second ceramic sleeve; 902. Second silicon carbide sleeve; 903. Thrust disc;

[0034] 10. Rotating gap;

[0035] 11. Thrust ring. Specific implementation mode

[0036] The following are specific embodiments of the present utility model and in combination with the accompanying drawings, the technical solutions of the present utility model are further described, but the present utility model is not limited to these embodiments.

[0037] It should be noted that the descriptions of directions such as "up", "down", "left", "right", "top", and "bottom" in the present utility model are all defined based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the described device must be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0038] As Figures 1 to 6 shown, an installation structure of a shaftless magnetic pump includes a pump housing 1 with a water inlet and a water outlet, a motor housing 2, a rotor assembly 3, a stator assembly 4, and an impeller 5.

[0039] The stator assembly 4 includes a stator assembly and a stator shielding sleeve wrapped outside the stator assembly. The stator shielding sleeve and the stator assembly can be integrally formed by injection molding, or the stator shielding sleeve can be first formed separately into a shielding sleeve one and a shielding sleeve two, and then the shielding sleeve one and the shielding sleeve two wrap the stator assembly. The shielding sleeve one and the shielding sleeve two are hermetically fixed by bolts and sealing rings to form an integral structure. Whether it is integrally formed or integrally assembled after being separated is convenient for subsequent installation. Among them, the stator assembly 4 has a cavity 401 that can accommodate the rotor assembly 3, and the central axis of the cavity 401 is consistent with the central axis of the stator assembly 4. Among them, the rotor assembly 3 is cylindrical, with an installation through hole 301 in the middle, and the central axis of the installation through hole 301 is consistent with the central axis of the rotor assembly 3. The rotor assembly 3 includes a rotor assembly and a rotor shielding sleeve wrapped around the rotor assembly. The rotor assembly is arranged around the installation through hole 301, and the rotor shielding sleeve and the rotor assembly are injection molded into an integral part.

[0040] The stator assembly 4 is fixed between the pump housing 1 and the motor housing 2. A pump chamber 6 is formed between the stator assembly 4 and the pump housing 1, and a motor chamber 7 is formed between the stator assembly 4 and the motor housing 2. The pump chamber 6 and the motor chamber 7 do not communicate with each other, and the stator assembly 4 and the pump housing 1 are sealed with a seal.

[0041] The cavity 401 in the middle of the stator assembly 4 opens towards the pump chamber 6. The rotor assembly 3 is embedded in the cavity 401 and rotates relative to the stator assembly 4 through a rotating assembly one 8 and a rotating assembly two 9. An impeller 5 is fixedly connected to the upper end of the installation through hole 301 of the rotor assembly 3.

[0042] In order to install the stator assembly 4 more stably and accurately, a stepped ring portion one 404 protruding outward is provided on the outer periphery of the stator assembly 4, and a stepped ring portion two 101 fixedly engaged with the stepped ring portion one 404 is provided at the lower end of the pump housing 1. An annular baffle 102 protrudes downward from the outer periphery of the stepped ring portion two 101, and the outer peripheral surface of the stepped ring portion one 404 abuts against the inner peripheral surface of the annular baffle 102. The setting of the annular baffle 102 can better position and install the stator assembly 4 and reduce the radial shaking of the stator assembly 4. An annular portion 201 protrudes outward from the upper end of the motor housing 2. The upper end surface of the annular portion 201 abuts against the lower end surface of the stepped ring portion one 404, and the outer peripheral surface of the annular portion 201 abuts against the inner peripheral surface of the annular baffle 102. The lower part of the stator assembly 4 abuts against the inner peripheral surface of the motor housing 2. The same annular baffle 102 is used to position and install the motor housing 2, making the stator assembly 4 fixed more stably.

[0043] In the case of no rotating shaft, in order to better support the rotation of the rotor assembly 3 and the impeller 5, the rotating assembly one 8 and the rotating assembly two 9 need to be firmly installed. Preferably, an installation groove one 402 and an installation convex ring 403 are respectively provided at both ends of the inner peripheral surface of the concave cavity 401. The installation groove one 402 is located at the opening end of the concave cavity 401, and the installation convex ring 403 is located at the bottom of the concave cavity 401. The inner peripheral surface diameter of the installation groove one 402 is greater than the inner peripheral surface diameter of the concave cavity 401 which is greater than the inner peripheral surface diameter of the installation convex ring 403. Such a setting can not only install the rotating assembly one 8 and the rotating assembly two 9, but also more conveniently install the rotor assembly 3. Then, an installation groove two 302 and an installation groove three 303 are respectively provided at both ends of the outer peripheral surface of the rotor assembly 3. The rotating assembly one 8 is fixedly arranged between the installation groove one 402 and the installation groove two 302, and the rotating assembly two 9 is fixedly arranged between the installation convex ring 403 and the installation groove three 303. There is a rotating gap 10 between the outer peripheral surface of the rotor assembly 3 and the inner peripheral surface of the concave cavity 401. By fixedly installing the rotating assembly one 8 in the installation groove one 402 and the installation groove two 302, and fixedly installing the rotating assembly two 9 in the installation convex ring 403 and the installation groove three 303, the gap distance between the stator assembly 4 and the rotor assembly 3 can be reduced, and further the distance between the stator assembly wrapped in the stator assembly 4 and the rotor assembly wrapped in the rotor assembly 3 can be reduced. The rotating assembly one 8 and the rotating assembly two 9 can support the rotation of the rotor assembly 3 relative to the stator assembly 4, and can also be fixed in the radial direction between the rotor assembly 3 and the stator assembly 4 to prevent their radial shaking, making the relative rotation between the rotor assembly 3 and the stator assembly 4 more stable within the smaller rotating gap 10 and improving the performance of the shaftless magnetic pump.

[0044] In order for the impeller 5 to rotate better with the rotor assembly 3, the impeller 5 and the rotor assembly 3 can be injection-molded integrally, or the impeller 5 can be separately molded and then installed and fixed. Preferably, the impeller 5 is separately molded. The upper end of the impeller 5 is an annular thrust portion, the middle is a blade portion, and the lower end is an annular part 501 and an annular part 502 arranged in a stepped manner. The impeller 5 has a through water through-hole in the middle. A thrust ring 11 is provided on the pump casing opposite to the annular thrust portion of the impeller 5. The outer peripheral diameter of the annular part 501 is larger than the outer peripheral diameter of the annular part 502, and the annular part 502 is arranged at the lower end of the annular part 501. The lower end surface of the annular part 501 is used to abut against the upper end surface of the rotor assembly 3, and the outer peripheral surface of the annular part 502 abuts against the inner peripheral surface of the concave cavity 401. When the impeller 5 is fixed to the rotor assembly 3, it does not touch the stator assembly 4. The annular part 501 and the annular part 502 keep the central axis of the impeller 5 and the rotor assembly 3 consistent, making the impeller 5 rotate more smoothly.

[0045] At the upper end of the installation through-hole 301, there are several inwardly protruding clamping blocks 304. The upper part of the clamping block 304 has a guiding surface. Several elastic plates 503 protrude from the annular part 502 towards the rotor assembly 3. The outer peripheral surface diameter of the elastic plate 503 is smaller than the outer peripheral surface diameter of the annular part 502. A clamping hole 504 for clamping the clamping block 304 is provided on the elastic plate 503. The radial movement of the impeller 5 and the rotor assembly 3 is restricted by the annular part 501 and the annular part 502. After the clamping hole 504 on the elastic plate 503 is clamped and fixed with the clamping block 304, the axial and circumferential movement of the impeller 5 relative to the rotor assembly 3 is restricted, better fixing the impeller 5. The upper part of the installation through-hole 301 has a flared groove 305 with a diameter larger than that of the installation through-hole 301. The clamping block 304 is formed on the inner peripheral surface of the flared groove 305. Several convex blocks 306 are also formed on the inner peripheral surface of the flared groove 305. Several fixing plates 505 protrude from the lower part of the impeller 5 towards the rotor assembly 3. A fixing groove 506 cooperating with the convex block 306 is provided on the fixing plate 505. The upper part of the fixing groove 506 passes through the annular part 502 and directly abuts against the lower end surface of the annular part 501. The flared groove 305 can increase the outer peripheral diameter of the elastic plate 503 relative to the impeller 5. The outer peripheral surfaces of several elastic plates 503 are arc surfaces. The larger the outer peripheral diameter of several elastic plates 503, the more stable the impeller 5 rotates relative to the rotor assembly 3.

[0046] There is a convex block 306 between two adjacent clamping blocks 304. The clamping block 304 and the convex block 306 both protrude from the inner peripheral surface of the flared groove 305 and are not connected. There is a fixing plate 505 between two adjacent elastic plates 503. The elastic plate 503 and the fixing plate 505 are independently suspended. The elastic plate 503 separately suspended below the impeller 5 has a certain elastic tendency, which can better press-fit and fix with the convex block 306.

[0047] Rotating assembly one 8 and rotating assembly two 9. Rotating assembly one 8 includes ceramic sleeve one 801 and silicon carbide sleeve one 802 sleeved outside ceramic sleeve one 801. Silicon carbide sleeve one 802 is tightly press-fitted and fixed in mounting groove one 402, and ceramic sleeve one 801 is tightly press-fitted and fixed in mounting groove two 302. A flow channel groove one is provided on the inner peripheral surface of silicon carbide sleeve one 802, and flow channel groove one communicates with pump chamber 6. The outer peripheral surface of ceramic sleeve one 801 and the inner peripheral surface of silicon carbide sleeve one 802 are in smooth sliding fit. Silicon carbide sleeve one 802 and mounting groove one 402 are tightly fitted and fixed, and ceramic sleeve one 801 and mounting groove two 302 are tightly fitted and fixed. Ceramic sleeve one 801 does not contact stator assembly 4, and silicon carbide sleeve one 802 does not contact rotor assembly 3. Moreover, the outer peripheral surface of ceramic sleeve one 801 and the inner peripheral surface of silicon carbide sleeve one 802 are in smooth sliding fit. The tight fit plus the smooth sliding fit make the spacing of rotation gap 10 stable. And the liquid flowing through pump chamber 6 in flow channel groove one can lubricate and cool silicon carbide sleeve one 802 and ceramic sleeve one 801, enabling them to rotate relative to each other better.

[0048] Rotating assembly two 9 includes ceramic sleeve two 901 and silicon carbide sleeve two 902 sleeved outside ceramic sleeve two 901. Silicon carbide sleeve two 902 is tightly press-fitted and fixed in mounting boss 403, and ceramic sleeve two 901 is tightly press-fitted and fixed in mounting groove three 303. A flow channel groove two is provided on the inner peripheral surface of silicon carbide sleeve two 902. The upper end surface of silicon carbide sleeve two 902 does not contact rotor assembly 3. The outer peripheral surface of ceramic sleeve two 901 and the inner peripheral surface of silicon carbide sleeve two 902 are in smooth sliding fit. Rotating assembly two 9 further includes a thrust plate 903. The lower end surface of thrust plate 903 abuts against the bottom surface of mounting boss 403, and the upper end surface abuts against both the lower end surfaces of ceramic sleeve two 901 and silicon carbide sleeve two 902. A flow channel groove three is provided on the upper end surface of thrust plate 903. The upper end of flow channel groove two communicates with rotation gap 10 and the lower end communicates with flow channel groove three, and flow channel groove three communicates with mounting through-hole 301. The lower end surface of rotor assembly 3 is higher than the upper end surface of thrust plate 903. The lower end surface of ceramic sleeve two 901 and the upper end surface of thrust plate 903 are in smooth sliding fit. First, thrust plate 903 is tightly fitted with the inner circumferential surface of mounting boss 403, and the lower end surface of thrust plate 903 abuts against the bottom surface of mounting boss 403. Then, silicon carbide sleeve two 902 is installed by being tightly fitted with mounting boss 403, and ceramic sleeve two 901 is installed by being tightly fitted with mounting groove three 303. Neither silicon carbide sleeve two 902 nor thrust plate 903 contacts rotor assembly 3. The outer peripheral surface of ceramic sleeve two 901 and the inner peripheral surface of silicon carbide sleeve two 902 are in smooth sliding fit, and the lower end surface of ceramic sleeve two 901 and the upper end surface of thrust plate 903 are in smooth sliding fit, making the spacing of rotation gap 10 stable. And the liquid flowing through pump chamber 6 in flow channel groove two and flow channel groove one can lubricate and cool silicon carbide sleeve two 902, ceramic sleeve two 901 and thrust plate 903, enabling them to rotate relative to each other better.

[0049] The above embodiments are only preferred embodiments of the present utility model, and do not limit the protection scope of the present utility model accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present utility model shall be covered within the protection scope defined by the claims of the present utility model.

Claims

1. An installation structure of a shaftless magnetic pump, comprising a pump casing (1), a motor casing (2), a rotor assembly (3), a stator assembly (4) and an impeller (5), characterized in that: The stator assembly (4) is fixed between the pump housing (1) and the motor housing (2). A pump chamber (6) is formed between the stator assembly (4) and the pump housing (1), and a motor chamber (7) is formed between the stator assembly (4) and the motor housing (2). The pump chamber (6) and the motor chamber (7) are not communicated with each other. The middle part of the stator assembly (4) also has a concave cavity (401) with an opening facing the pump chamber (6). The rotor assembly (3) is embedded in the concave cavity (401) and rotates relative to the stator assembly (4) through a first rotating assembly (8) and a second rotating assembly (9). The rotor assembly (3) has a mounting through hole (301) that is consistent with the central axis of the rotor assembly (3). An impeller (5) is fixedly connected to the upper end of the mounting through hole (301).

2. The installation structure of a shaftless magnetic pump according to claim 1, characterized in that: Both ends of the inner peripheral surface of the concave cavity (401) respectively have a first mounting groove (402) and a mounting convex ring (403). The inner peripheral surface diameter of the first mounting groove (402) is greater than the inner peripheral surface diameter of the concave cavity (401), which is greater than the inner peripheral surface diameter of the mounting convex ring (403). Both ends of the outer peripheral surface of the rotor assembly (3) respectively have a second mounting groove (302) and a third mounting groove (303). The first rotating assembly (8) is fixedly arranged between the first mounting groove (402) and the second mounting groove (302), and the second rotating assembly (9) is fixedly arranged between the mounting convex ring (403) and the third mounting groove (303). There is a rotating gap (10) between the outer peripheral surface of the rotor assembly (3) and the inner peripheral surface of the concave cavity (401).

3. The installation structure of a shaftless magnetic pump according to claim 2, characterized in that: The lower end of the impeller (5) protrudes with a first annular part (501) and a second annular part (502). The first annular part (501) and the second annular part (502) are arranged in a stepped manner. The lower end surface of the first annular part (501) abuts against the upper end surface of the rotor assembly (3), and the outer peripheral surface of the second annular part (502) abuts against the inner peripheral surface of the concave cavity (401).

4. The installation structure of a shaftless magnetic pump according to claim 3, characterized in that: The upper end of the mounting through hole (301) has several inwardly protruding clamping blocks (304). The upper part of the clamping blocks (304) has a guiding surface. The second annular part (502) protrudes several elastic plates (503) towards the rotor assembly (3). The outer peripheral surface diameter of the elastic plates (503) is smaller than the outer peripheral surface diameter of the second annular part (502). A clamping hole (504) for clamping the clamping blocks (304) is arranged on the elastic plates (503).

5. The installation structure of a shaftless magnetic pump according to claim 4, characterized in that: The upper part of the mounting through hole (301) has a flared groove (305) with a diameter larger than that of the mounting through hole (301). The clamping blocks (304) are formed on the inner peripheral surface of the flared groove (305). Several convex blocks (306) are also formed on the inner peripheral surface of the flared groove (305). The lower part of the impeller (5) protrudes several fixing plates (505) towards the rotor assembly (3). Fixing grooves (506) that cooperate with the convex blocks (306) are arranged on the fixing plates (505). The upper part of the fixing grooves (506) passes through the second annular part (502) and directly abuts against the lower end surface of the first annular part (501).

6. The installation structure of a shaftless magnetic pump according to claim 5, characterized in that: There is a bump (306) between two adjacent clamping blocks (304). Both the clamping blocks (304) and the bump (306) protrude from the inner peripheral surface of the flaring groove (305) and are not connected. There is a fixing plate (505) between two adjacent elastic plates (503). The elastic plates (503) and the fixing plate (505) are independently suspended.

7. The installation structure of a shaftless magnetic pump according to any one of claims 1 to 6, characterized in that: The outer periphery of the stator assembly (4) has a first stepped ring portion (404) protruding outward. The lower end portion of the pump housing (1) has a second stepped ring portion (101) fixedly fitted with the first stepped ring portion (404). The outer periphery of the second stepped ring portion (101) protrudes downward with an annular baffle (102). The outer peripheral surface of the first stepped ring portion (404) abuts against the inner peripheral surface of the annular baffle (102).

8. The installation structure of a shaftless magnetic pump according to claim 7, characterized in that: The upper end portion of the motor housing (2) protrudes outward with an annular portion (201). The upper end surface of the annular portion (201) abuts against the lower end surface of the first stepped ring portion (404). The outer peripheral surface of the annular portion (201) abuts against the inner peripheral surface of the annular baffle (102).

9. The installation structure of a shaftless magnetic pump according to claim 1, characterized in that: The rotor assembly (3) is an integrally injection-molded part. The stator assembly (4) is an integrally injection-molded part or is formed into an integral part after being separately injection-molded and then assembled and fixed.

10. The installation structure of a shaftless magnetic pump according to claim 2, characterized in that: The first rotating assembly (8) includes a first ceramic sleeve (801) and a first silicon carbide sleeve (802) sleeved outside the first ceramic sleeve (801). The first silicon carbide sleeve (802) is fixed in the first installation groove (402). The first ceramic sleeve (801) is fixed in the second installation groove (302). The outer peripheral surface of the first ceramic sleeve (801) is in smooth sliding fit with the inner peripheral surface of the first silicon carbide sleeve (802). The second rotating assembly (9) includes a second ceramic sleeve (901), a second silicon carbide sleeve (902) sleeved outside the second ceramic sleeve (901), and a thrust disc (903) located below the second ceramic sleeve (901) and the second silicon carbide sleeve (902). The second silicon carbide sleeve (902) is fixed in the installation convex ring (403). The second ceramic sleeve (901) is fixed in the third installation groove (303). A second flow channel groove is provided on the inner peripheral surface of the second silicon carbide sleeve (902). The outer peripheral surface of the second ceramic sleeve (901) is in smooth sliding fit with the inner peripheral surface of the second silicon carbide sleeve (902). The lower end surface of the second ceramic sleeve (901) is in smooth sliding fit with the upper end surface of the thrust disc (903).

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