A shielding structure for a magnetic pump

Abstract

This invention provides a shielding structure for a magnetic pump, belonging to the field of pump technology. It solves the technical problems of poor shaft sealing in existing magnetic pumps. In this shielding structure, a first shielding sleeve and a second shielding sleeve are fixedly connected between the pump housing and the motor housing. The first shielding sleeve includes an integrally formed first fixing part, a first recessed cavity, and a first supporting part. The first fixing part is located on the outer periphery of the upper end of the first recessed cavity and protrudes outward. The first supporting part is located at the lower end of the first recessed cavity and protrudes downward. The second shielding sleeve includes an integrally formed second fixing part, a second recessed cavity, and a second supporting part. The second fixing part is located on the outer periphery of the upper end of the second recessed cavity and protrudes outward. The second supporting part is located at the lower end of the second recessed cavity and protrudes downward. The first recessed cavity is embedded within the second recessed cavity, and one end of the first supporting part is embedded within the second supporting part. This invention enables the pump shaft of the magnetic pump to achieve unilateral support and provides a better sealing effect.

Description

Technical Field

[0001] This utility model belongs to the field of pump technology, and specifically refers to a shielding structure for a magnetic pump. Background Technology

[0002] Magnetic drive pumps employ contactless magnetic coupling transmission. A motor drives an outer magnetic rotor, which in turn rotates the inner magnetic rotor and pump shaft within an isolation sleeve via a magnetic field, driving the impeller. The key structural element is the isolation sleeve between the inner and outer magnetic rotors, which completely seals the pump shaft and inner magnetic rotor, preventing leakage along the shaft and cooling internal components. It achieves excellent sealing without the need for dynamic sealing, making it widely used for conveying corrosive, flammable, and explosive media.

[0003] Existing pump shaft mounting structures, such as the improved permanent magnet filling pump structure in patent number 2011103300199, disclose a single-sided cantilever composite shaft structure. This structure mainly includes a front cover, impeller, rear cover, composite shaft, and filling motor. Support is provided by a single-sided support from the rear frame of the motor. The composite shaft is composed of a ceramic bushing and a metal shaft. The metal shaft passes through the ceramic bushing, and its head is sealed with an O-ring. A nut is tightened onto the rear frame of the motor, forming a cantilever compression structure for sealing. Insufficient pre-tightening force with the nut can lead to leakage at the sealing surface, while over-tightening may squeeze out and damage the O-ring, also easily causing leakage and corrosion of the metal shaft, affecting the normal operation of the pump. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a shielding structure for a magnetic pump. The technical problem this invention aims to solve is how to achieve single-sided support for the pump shaft of a magnetic pump while also providing a better sealing effect.

[0005] The objective of this utility model can be achieved through the following technical solution: A shielding structure for a magnetic pump, comprising a pump housing and a motor housing fixedly connected to the pump housing, wherein a first shielding sleeve and a second shielding sleeve are fixedly connected between the pump housing and the motor housing. The first shielding sleeve comprises an integrally formed first fixing part, a first recessed cavity part, and a first supporting part. The first fixing part is located on the outer periphery of the upper end of the first recessed cavity part and protrudes outward, and the first supporting part is located at the lower end of the first recessed cavity part and protrudes downward. The second shielding sleeve comprises an integrally formed second fixing part, a second recessed cavity part, and a second supporting part. The second fixing part is located on the outer periphery of the upper end of the second recessed cavity part and protrudes outward, and the second supporting part is located at the lower end of the second recessed cavity part and protrudes downward. The first fixing part and the second fixing part are sealed and fixed, the first recessed cavity part is embedded in the second recessed cavity part, and one end of the first supporting part is embedded in the second supporting part. In this solution, both the first shielding sleeve and the second shielding sleeve are integrally formed. The integrally formed first recessed cavity part and the first supporting part of the first shielding sleeve form a zero-leakage static isolation barrier for installing the pump shaft and rotor assembly.

[0006] Furthermore, several triangular support ribs protrude outward from the outer side wall of the second support portion.

[0007] Furthermore, a baffle plate is fixedly connected to the lower part of the second concave cavity, and there is a gap between the baffle plate and the lower part of the second concave cavity. The baffle plate is provided with a gap hole, and the second support part is embedded in the gap hole and fixed to the gap hole.

[0008] Furthermore, the upper part of the baffle plate has several reinforcing strips protruding upwards.

[0009] Furthermore, a mounting cavity is formed between the first recess and the second recess, and a stator assembly is fixedly connected in the mounting cavity. A rotor assembly is disposed in the first recess, and the rotor assembly includes a rotor bushing.

[0010] Furthermore, one end of the pump shaft is fixedly connected within the first support portion, while the other end of the pump shaft is located within the first recessed portion and slidably connected to the rotor sleeve. The rotor sleeve is fitted over the pump shaft. A thrust member is fixedly connected within the first recessed portion, fitted over the pump shaft, with its upper end sliding against the lower end of the rotor sleeve. The rotor sleeve is made of silicon carbide, and the pump shaft is made of ceramic. The silicon carbide and ceramic achieve self-lubricating rotation under oil-free and grease-free conditions. The pump shaft bears the rotational force and is corrosion-resistant, allowing it to remain immersed in the medium for extended periods while also utilizing the medium for cooling and lubrication.

[0011] Compared with the prior art, the technical effects of this utility model are as follows: the first shielding sleeve and the second shielding sleeve, which are integrally formed, constitute an absolutely reliable static sealing barrier, and the first support part is embedded in the second support part to form a radial support point for the pump shaft. This allows the pump shaft to be supported on one side, driving the rotor assembly to rotate, reducing the resistance of water flow at the pump casing inlet. The structure of the baffle plate and the gap between the baffles can lengthen the first support part and strengthen the radial force of the first support part, enabling the pump shaft of the magnetic pump to be supported on one side and giving the magnetic pump a better sealing effect. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of the present invention.

[0013] Figure 2 This is a cross-sectional view of the first and second shielding sleeves of this utility model.

[0014] Figure 3 This is a perspective view of the first and second shielding sleeves of this utility model.

[0015] Drawing number markings: 1. Pump housing; 2. Motor housing; 3. First shielding sleeve; 301. First fixing part; 302. First recessed cavity part; 303. First support part; 4. Second shielding sleeve; 401. Second fixing part; 402. Second recessed cavity part; 403. Second support part; 404. Triangular support rib; 5. Baffle plate; 501. Baffle gap; 502. Baffle hole; 6. Mounting cavity; 7. Stator assembly; 8. Rotor assembly; 801. Rotor shaft sleeve; 9. Pump shaft; 10. Thrust member. Detailed Implementation

[0016] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0017] It should be noted that the descriptions of "up", "down", "left", "right", "top", "bottom", etc. in this utility model are defined based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] according to Figures 1 to 3As shown, a shielding structure for a magnetic pump includes a pump housing 1 and a motor housing 2 fixedly connected to the pump housing 1. A first shielding sleeve 3 and a second shielding sleeve 4 are fixedly connected between the pump housing 1 and the motor housing 2. The first shielding sleeve 3 includes an integrally formed first fixing part 301, a first recessed part 302, and a first support part 303. The first fixing part 301 is located on the outer periphery of the upper end of the first recessed part 302 and protrudes outward. The first support part 303 is located on the lower end of the first recessed part 302 and protrudes downward. The second shielding sleeve 4 includes an integrally formed second fixing part 401, a second recessed part 402, and a second support part 403. The second fixing part 401 is located on the outer periphery of the upper end of the second recessed part 402 and protrudes outward. The second support part 403 is located on the lower end of the second recessed part 402 and protrudes downward. The first fixing part 301 and the second fixing part 401 are sealed and fixed. The first recessed part 302 is embedded in the second recessed part 402. One end of the first support part 303 is embedded in the second support part 403. The first shielding sleeve 3 and the second shielding sleeve 4 are both integrally formed. The first concave portion 302 and the first support portion 303 of the first shielding sleeve 3, which are integrally formed, form a zero-leakage static isolation barrier for installing the pump shaft 9 and the rotor assembly 8. The pump casing 1 has an inlet and an outlet for conveying the medium. The pump casing 1 and the second fixing portion 401 are fixed together by bolts. The motor casing 2 is also fixed together with the second fixing portion 401 by bolts. The second fixing portion 401 has a slot, and the first fixing portion 301 is fixedly engaged in the slot. A sealing ring is also provided between the first fixing portion 301 and the second fixing portion 401. Several triangular support ribs 404 protrude outward from the outer side wall of the second support portion 403. A baffle plate 5 is fixedly connected to the lower part of the second concave portion 402. There is a gap 501 between the baffle plate 5 and the lower part of the second concave portion 402. The baffle plate 5 is provided with a gap hole 502. The second support portion 403 is embedded in the gap hole 502 and fixed to the gap hole 502. The upper part of the baffle plate 5 has several reinforcing strips protruding upwards. A mounting cavity 6 is formed between the first recess 302 and the second recess 402. The stator assembly 7, which includes several stator magnets, is fixedly connected in the mounting cavity 6. A rotor assembly 8 is disposed in the first recess 302. The rotor assembly 8 includes a rotor sleeve 801 and a rotor shield sleeve. The rotor magnets are fixedly disposed in the rotor shield sleeve. The rotor sleeve 801 is fixedly disposed on the inner circumference of the rotor shield sleeve. An impeller is also snapped and fixedly connected to the upper part of the rotor shield sleeve. One end of the pump shaft 9 is fixedly connected in the first support part 303. The other end of the pump shaft 9 is located in the first recess 302 and is slidably connected to the rotor sleeve 801. The rotor sleeve 801 is sleeved on the outside of the pump shaft 9. A thrust member 10 is fixedly connected in the first recess 302. The thrust member 10 is sleeved on the outside of the pump shaft 9. The upper end of the thrust member 10 slides against the lower end of the rotor sleeve 801.The rotor bushing 801 is made of silicon carbide, and the pump shaft 9 is made of ceramic. The silicon carbide and ceramic achieve self-lubricating rotation under oil-free and grease-free conditions. The pump shaft 9 bears the rotational force and is corrosion-resistant. The pump shaft 9 can be in the medium for a long time and can also be cooled and lubricated by the medium.

[0019] The integrally formed first shielding sleeve 3 and second shielding sleeve 4 constitute an absolutely reliable static sealing barrier, and the first support part 303 is embedded in the second support part 403 to form the radial support point of the pump shaft 9. This allows the pump shaft 9 to be supported on one side, driving the rotor assembly 8 to rotate, reducing the resistance of water flow at the inlet of the pump casing 1. The structure of the baffle plate 5 and the baffle gap 501 can lengthen the first support part 303 and strengthen the radial force of the first support part 303, enabling the pump shaft 9 of the magnetic pump to achieve unilateral support and giving the magnetic pump a better sealing effect.

[0020] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection defined by the claims of the present utility model.

Claims

1. A shielding structure for a magnetic pump, comprising a pump housing (1) and a motor housing (2) fixedly connected to the pump housing (1), characterized in that: A first shielding sleeve (3) and a second shielding sleeve (4) are fixedly connected between the pump housing (1) and the motor housing (2). The first shielding sleeve (3) includes an integrally formed first fixing part (301), a first recessed cavity part (302), and a first supporting part (303). The first fixing part (301) is located on the outer periphery of the upper end of the first recessed cavity part (302) and protrudes outward. The first supporting part (303) is located at the lower end of the first recessed cavity part (302) and protrudes downward. The second shielding sleeve (4) includes an integrally formed second fixing part (301). The first fixing part (401), the second cavity part (402), and the second support part (403) are located on the outer periphery of the upper end of the second cavity part (402) and protrude outward. The second support part (403) is located at the lower end of the second cavity part (402) and protrudes downward. The first fixing part (301) and the second fixing part (401) are sealed and fixed. The first cavity part (302) is embedded in the second cavity part (402). One end of the first support part (303) is embedded in the second support part (403).

2. The shielding structure of a magnetic pump according to claim 1, characterized in that: The outer side wall of the second support part (403) has several triangular support ribs (404) protruding outward.

3. The shielding structure of a magnetic pump according to claim 1, characterized in that: A baffle plate (5) is fixedly connected to the lower part of the second concave cavity (402). There is a gap (501) between the baffle plate (5) and the lower part of the second concave cavity (402). The baffle plate (5) is provided with a gap hole (502). The second support part (403) is embedded in the gap hole (502) and fixed to the gap hole (502).

4. The shielding structure of a magnetic pump according to claim 3, characterized in that: The upper part of the baffle (5) has several reinforcing strips protruding upwards.

5. The shielding structure of a magnetic pump according to any one of claims 1 to 4, characterized in that: An installation cavity (6) is formed between the first cavity (302) and the second cavity (402). A stator assembly (7) is fixedly connected in the installation cavity (6). A rotor assembly (8) is provided in the first cavity (302). The rotor assembly (8) includes a rotor bushing (801).

6. The shielding structure of a magnetic pump according to claim 5, characterized in that: One end of the pump shaft (9) is fixedly connected inside the first support part (303). The other end of the pump shaft (9) is located inside the first cavity part (302) and is slidably connected to the rotor bushing (801). The rotor bushing (801) is sleeved outside the pump shaft (9). A thrust member (10) is fixedly connected inside the first cavity part (302). The thrust member (10) is sleeved outside the pump shaft (9). The upper end of the thrust member (10) slides against the lower end of the rotor bushing (801).

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