CN-121576301-B - Combined type back shaft structure of magnetic drive pump

Abstract

The invention provides a composite supporting shaft structure of a magnetic pump, and belongs to the technical field of magnetic pumps. The magnetic pump solves the technical problems that the existing magnetic pump support shaft is easy to be corroded by a conveying medium, the sealing reliability is insufficient, and the rigid support and vibration suppression are difficult to be compatible when the magnetic pump is operated at a high speed. The composite supporting shaft structure comprises a shielding cover and an integrally formed supporting shaft fixedly connected with the shielding cover, wherein the supporting shaft is provided with a fixing section and a supporting section which are mutually perpendicular, a fixing shaft with one end open is sleeved on the periphery of the supporting section, an elastic gasket is arranged among the shielding cover, the supporting shaft and/or the fixing shaft, and a sealing structure is arranged between the fixing section and the shielding cover and around the opening end of a containing hole. The invention has the advantages of high supporting rigidity, complete isolation of corrosive medium, good sealing reliability, effective suppression of vibration and noise, stable operation, long service life and the like.

Inventors

• CHENG KAI
• LIN WENFU
• LIN KAIFENG
• LI XINXIANG

Assignees

• 凯利达新能源科技(浙江)有限公司

Dates

Publication Date

20260505

Application Date

20260127

Claims (3)

1. 1. A combined type supporting shaft structure of a magnetic pump comprises a shielding cover (1) and a supporting shaft (2) fixedly connected with the shielding cover (1), and is characterized in that the supporting shaft (2) is an integral rigid piece and comprises a fixing section (21) and a supporting section (22) which are arranged vertically, a concave cavity (11) which is concave inwards is formed in the middle of the shielding cover (1), the fixing section (21) is fixedly connected with the bottom of the concave cavity (11), the shielding cover (1) is further provided with a mounting hole (12), the mounting hole (12) and the concave cavity (11) are coaxially arranged, the supporting section (22) penetrates through the mounting hole (12), a fixing shaft (3) is fixedly sleeved on the periphery of the supporting section (22), the fixing shaft (3) is provided with a containing hole (31) which is used for containing the supporting section (22) and is provided with an opening at one end, and an elastic gasket (4) is arranged among the supporting shaft (2), the shielding cover (1) and/or the fixing shaft (3); The bottom of the concave cavity (11) is convexly provided with a first mounting seat (15) towards the opening end of the concave cavity, a first step hole (151) and a second step hole (152) which are communicated with the mounting hole (12) are formed in the first mounting seat (15), the aperture of the second step hole (152) is larger than that of the first step hole (151), one end, adjacent to the fixed section (21), of the supporting section (22) is radially protruded to form a first flange section (221), the opening end of the fixed shaft (3) is axially abutted with the end of the first flange section (221), the elastic gasket (4) is arranged in the first step hole (151) and is respectively abutted with the first flange section (221) and the fixed shaft (3) in the radial and axial directions, and a first sealing piece (5) is arranged in the second step hole (152) and is radially abutted with the fixed shaft (3).
2. 2. The composite support shaft structure of a magnetic pump according to claim 1, wherein the shielding cover (1) comprises an outer sleeve (13) and an inner sleeve (14) which are fixedly connected, the concave cavity (11) and the inner sleeve (14) are integrally formed, and the fixing section (21) is fixed between the outer sleeve (13) and the bottom of the concave cavity (11).
3. 3. A compound support shaft structure of a magnetic pump as claimed in claim 1, wherein at least one of the first sealing members (5) is provided.

Description

Combined type back shaft structure of magnetic drive pump Technical Field The invention relates to the technical field of magnetic pumps, in particular to a composite supporting shaft structure of a magnetic pump. Background The magnetic pump is used as a sealing pump device adopting non-contact magnetic coupling transmission, can realize complete medium isolation and prevent shaft seal leakage, and is widely applied to occasions for conveying corrosive, inflammable, explosive, toxic or high-purity mediums, such as chemical industry, pharmacy, electroplating, semiconductors, photovoltaics and other industries. In the core structure of the magnetic pump, the shaft system for supporting the rotor assembly is a key component for ensuring long-term stable operation of the magnetic pump. The support shaft not only needs to bear the composite load such as rotor weight, fluid radial force, impeller axial thrust and the like, but also needs to maintain enough rigidity and stability under high-speed rotation, and meanwhile, must resist the chemical corrosion of the medium. Currently, a supporting shaft structure in the prior art has a composite fixed shaft structure of a permanent magnet canned pump as disclosed in CN104791257B, which adopts a composite fixed shaft structure combining a metal shaft and a fixed shaft, wherein a ceramic shaft sleeve and a rear cover are radially sealed by a sealing ring to protect the metal shaft inside. However, the shaft is mainly supported by a slender metal shaft in a radial direction, the fixed shaft can shake radially relative to the metal shaft under the action of the rotation force of the rotor assembly and the impeller, so that the sealing ring is invalid or worn and leaks, the surface of the metal shaft is easy to generate chemical or electrochemical corrosion, the shaft diameter is gradually reduced, the fit clearance between the metal shaft and the bearing is increased, further, the vibration of the rotor is aggravated, the efficiency is reduced, and even the shaft body is broken when serious. In order to solve the corrosion resistance and sealing problems, CN118564471B proposes an inner rotor magnetic pump, and a plastic mounting column integrally injection-molded with a stator shielding sleeve is adopted as a supporting piece. The structure does not need an additional sealing piece, has better overall corrosion resistance, avoids arranging a supporting structure at the fluid inlet, and reduces the flow resistance. However, the elastic modulus of the plastic material is low, and the cantilever type mounting column is easy to bend and deform when rotating at a high speed, so that radial shaking of the rotor system is aggravated, and a shaking phenomenon can be caused, so that the running stability and the service life are influenced. In order to achieve both corrosion resistance and high rigidity, CN120384879B proposes a single support shaft magnetic pump, and a support shaft is made of ceramic materials. The ceramic has excellent corrosion resistance, high hardness and higher rigidity, and can effectively inhibit deformation and vibration at high speed. However, ceramic materials have the problems of high cost, high processing difficulty, high brittleness and poor impact resistance. In addition, in order to meet the rigidity requirement, the shaft diameter is often required to be increased, and the cost and the overall structural size are further increased. In summary, the supporting shaft structure of the conventional magnetic pump is difficult to achieve an ideal balance among corrosion resistance, mechanical rigidity, operational reliability and manufacturing cost. Therefore, development of a new supporting structure is needed, which not only has excellent corrosion resistance and enough supporting rigidity, but also can fundamentally avoid the risk of sealing leakage, and meanwhile, has reasonable economy, so as to meet the requirements of long-term, stable and efficient operation of the magnetic pump in a severe medium. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a composite supporting shaft structure of a magnetic pump. The combined type support shaft structure of the magnetic pump comprises a shielding cover and a support shaft fixedly connected with the shielding cover, wherein the support shaft is an integral rigid piece and comprises a fixing section and a support section which are arranged vertically, a concave cavity which is concave inwards is formed in the middle of the shielding cover and fixedly connected with the bottom of the concave cavity, a mounting hole is formed in the shielding cover and is coaxial with the concave cavity, the support section penetrates through the mounting hole, a fixing shaft is fixedly sleeved on the periphery of the support section, the fixing shaft is provided with a containing hole which is used for containing the support section and is provided with an opening at one