Full-heat-preservation magnetic drive pump structure

Abstract

The utility model relates to the field of magnetic pumps, and provides a full-heat-preservation magnetic pump structure. Comprising a shell, an impeller installed in the shell, a rotating shaft, an input shaft and a magnetic assembly, the shell comprises a pump shell, a pump cover and an end cover, a heat exchange cavity is formed in the pump cover, the shaft end, close to the input shaft, of the rotating shaft is sleeved with an isolation sleeve, the isolation sleeve is located between a magnetic outer sleeve and a magnetic inner sleeve, and the end, close to the input shaft, of the isolation sleeve is closed; the other end of the isolation sleeve is in sealing fit with the inner wall of a heat exchange cavity in the pump cover, and the outer side wall of the isolation sleeve is in sealing fit with an isolation ring in the heat exchange cavity. The heat exchange cavity is machined in the pump shell, heat preservation of the pump body is achieved through circulating hot water introduced into the heat exchange cavity, especially heat preservation of the bearing portion, and the influence of crystallization of a conveyed medium on operation of the pump is avoided. By means of the design of the double isolation sleeves, conveyed media can be effectively prevented from entering the input section of the pump body through the inner isolation sleeve, and the input end of the pump body is prevented from being affected by washing water and heat exchange media through the outer isolation sleeve.

Description

Technical Field

[0001] The utility model relates to the field of magnetic pumps, in particular to a fully thermally insulated magnetic pump structure. Background Art

[0002] Magnetic pumps are centrifugal pumps that utilize permanent magnetic couplings. They are often used in the transportation of chemical media due to their fully sealed, leak-free, and corrosion-resistant properties. During chemical production, some components in the solution are prone to crystallization at low temperatures. The crystallized material accumulates within the pump body and its various gaps, causing blockages and impacting the pump's delivery efficiency. Existing technology often employs an insulating jacket, circulating water through the outer jacket of the pump body to insulate the pump body and prevent crystallization. However, the transported medium can still seep into the input end of the pump shaft through locations such as the bearing gap. Even the heat exchange medium within the jacket can enter the pump body through these gaps, contaminating the bearings and other components at the input end. Accumulating the crystallized medium at the input end can affect the function of components such as the bearings and magnetic sleeves, shortening the life of the magnetic pump. Summary of the Invention

[0003] In order to meet the thermal insulation requirements of a magnetic pump when conveying a medium that is easy to crystallize and to avoid contamination of the medium on the input end of the magnetic pump, the purpose of the utility model is to provide a fully thermally insulated magnetic pump structure.

[0004] The technical solution adopted by this utility model is:

[0005] A fully insulated magnetic pump structure includes a shell, an impeller installed in the shell, a rotating shaft, an input shaft and a magnetic assembly. The magnetic assembly includes a magnetic inner sleeve and a magnetic outer sleeve. A liquid inlet is provided at one end of the shell, and a liquid outlet is provided at the top of the shell. The rotating shaft is rotatably supported in the shell by a pair of bearings. The impeller is fixedly installed at the end of the rotating shaft. The impeller is located between the liquid inlet and the liquid outlet. The input shaft is coaxially arranged with the rotating shaft. The input shaft is rotatably supported at one end of the shell. The end of the input shaft located outside the shell is connected to the input torque. The end of the input shaft located inside the shell is fixedly installed with a magnetic outer sleeve. The end of the rotating shaft corresponding to the input shaft A magnetic inner sleeve is fixedly installed, and the magnetic inner sleeve cooperates with the magnetic outer sleeve to transmit torque. The shell includes a pump shell, a pump cover and an end cover connected in sequence. The liquid inlet and the liquid outlet are located in the pump shell, and the rotating shaft is supported in the pump cover. At least one heat exchange chamber is provided in the pump cover, and the heat exchange chamber is connected to a heat exchange medium interface. The heat exchange contact interface passes through circulating hot water. An isolation sleeve is provided on the shaft end of the rotating shaft close to the input shaft. The isolation sleeve is located between the magnetic outer sleeve and the magnetic inner sleeve. One end of the isolation sleeve close to the input shaft is closed, and the other end of the isolation sleeve is sealed with the inner wall of the heat exchange chamber in the pump cover, and the outer wall of the isolation sleeve is sealed with the isolation ring in the heat exchange chamber.

[0006] Furthermore, the isolation sleeve is a double-layer isolation sleeve, the inner isolation sleeve is separated between the inner cavity of the pump cover and the end cover, and the outer isolation sleeve is separated between the heat exchange cavity and the end cover.

[0007] Furthermore, the rotating shaft is a hollow rotating shaft, and both ends of the rotating shaft are connected to the interior of the inner isolation sleeve and the interior of the pump casing.

[0008] Furthermore, the pump housing is provided with a flushing port, which is communicated with the inner cavity of the inner isolation sleeve.

[0009] Furthermore, the end of the input shaft corresponding to the rotating shaft is fixedly mounted with a magnetic frame, the magnetic outer sleeve is fixedly mounted inside the magnetic frame, the end of the rotating shaft corresponding to the input shaft is fixedly mounted with a magnetic disk, and the magnetic inner sleeve is fixedly mounted on the magnetic disk.

[0010] Furthermore, one end face of the bearing cooperates with the shoulder of the rotating shaft, and a mechanical seal is provided between the other end face of the bearing and the corresponding magnetic disk or impeller.

[0011] After adopting the above technical solution, the beneficial effects of the utility model are:

[0012] 1. A heat exchange cavity is machined inside the pump casing, and circulating hot water is introduced into the heat exchange cavity to achieve heat preservation of the pump body, especially the bearing parts, to avoid the influence of crystallization of the transported medium on the operation of the pump.

[0013] 2. The double isolation sleeve design can effectively prevent the conveyed medium from entering the input section of the pump body through the inner isolation sleeve, and prevent the flushing water and heat exchange medium from affecting the input end of the pump body through the outer isolation sleeve.

[0014] 3. The medium in the pump body can be cleaned by setting a flushing port and a hollow rotating shaft. The flushing water can flush the crystals in the pump body to avoid the impact of accumulation. The hollow rotating shaft can use the negative pressure generated at the impeller to return the medium entering the pump body input end to the liquid outlet of the pump casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the present utility model.

[0016] In the figure: impeller 1, rotating shaft 2, bearing 3, input shaft 4, pump casing 5, pump cover 6, end cover 7, liquid outlet 8, liquid inlet 9, magnetic disk 10, magnetic inner sleeve 11, mechanical seal ring 12, magnetic frame 13, magnetic outer sleeve 14, heat exchange chamber 15, heat exchange medium interface 16, flushing port 17, isolation sleeve 18, isolation ring 19. DETAILED DESCRIPTION

[0017] The following is a further description of the specific embodiments of the present invention with reference to the accompanying drawings:

[0018] like Figure 1 As shown, a fully insulated magnetic pump structure includes a casing, an impeller 1 installed in the casing, a rotating shaft 2, a bearing 3, an input shaft 4, and a magnetic assembly.

[0019] The pump casing consists of three parts, a pump housing 5, a pump cover 6, and an end cover 7, which are bolted together. A liquid outlet 8 is located at the top of the pump casing 5, and a liquid inlet 9 is located on the side of the pump casing 5. Both liquid inlet 9 and liquid outlet 8 are connected by pipes. The impeller 1 is installed within the pump casing 5 and is located between the liquid inlet 9 and liquid outlet 8.

[0020] The rotating shaft 2 is rotatably supported within the pump cover 6 via a pair of bearings 3. One end of the rotating shaft 2 extends into the pump casing 5 and is connected to the impeller 1. The impeller 1 is fixed to the end of the rotating shaft 2 extending into the pump casing 5 via a locknut. A magnetic disk 10 is fixedly mounted on the end of the rotating shaft 2 away from the impeller 1. A magnetic inner sleeve 11 is fixedly mounted on the magnetic disk 10. One end face of the bearing 3 mates with the shoulder of the rotating shaft 2. A mechanical seal 12 is provided between the other end face of the bearing 3 and the corresponding magnetic disk 10 or impeller 1. The input shaft 4 is rotatably supported on the end cover 7 through a bearing seat. The input shaft 4 is coaxially arranged with the rotating shaft 2. The end of the input shaft 4 opposite to the rotating shaft 2 is fixedly connected to a magnetic frame 13. The magnetic frame 13 is coaxial with the magnetic disk 10 and is sleeved on the outer side of the magnetic disk 10. A magnetic sleeve 14 is fixedly installed on the magnetic frame 13. The end of the rotating shaft 2 extending out of the end cover is connected to the motor input. The motor drives the rotating shaft 2 to rotate. The magnetic force of the magnetic sleeve 14 and the magnetic inner sleeve 11 cooperates to form a magnetic coupling transmission, thereby transmitting the torque to the impeller 1 through the rotating shaft 2.

[0021] The sidewall of the pump cover 6 is machined with a heat exchange chamber 15, which is fed with circulating hot water via a heat exchange medium interface 16. This circulating hot water prevents the medium from crystallizing within the pump cover 6. The pump cover 6 is also machined with a flushing port 17, which is connected to a flushing water input. This flushing port 17 communicates with the inner cavity of the pump cover 6, allowing the flushing of crystals within the pump cover 6. The rotating shaft 2 is hollow, with both ends of the rotating shaft 2 connecting the interior of the pump cover 6 and the interior of the pump casing 5. Flushing water can flow back into the pump casing 2 through the hollow rotating shaft 2. Simultaneously, due to the negative pressure generated by the rotation of the impeller 1, the medium within the pump cover 6 and the flushing water can flow back into the pump casing 2 under the action of the negative pressure, and finally be discharged through the liquid outlet 8.

[0022] An isolation sleeve 18 is mounted on the end of rotating shaft 2 near the input shaft. This sleeve is located between outer magnetic sleeve 14 and inner magnetic sleeve 11. It is a thin-walled cup-shaped body, sealed at one end near input shaft 4. The other end seals against the inner wall of the heat exchange chamber within pump cover 6. The outer wall of isolation sleeve 18 seals against an isolation ring 19 within the heat exchange chamber. Isolation sleeve 18 is a double-layered isolation sleeve. The inner isolation sleeve separates the inner chamber of pump cover 6 from end cover 7, preventing the conveying medium from entering the input end. The outer isolation sleeve separates the heat exchange chamber 15 from end cover 7, preventing flushing water and hot water from entering the input end.

Claims

1. A fully insulated magnetic pump structure, comprising a casing, an impeller installed in the casing, a rotating shaft, an input shaft and a magnetic assembly, the magnetic assembly comprising a magnetic inner sleeve and a magnetic outer sleeve, one end of the casing is provided with a liquid inlet, the top of the casing is provided with a liquid outlet, the rotating shaft is rotatably supported in the casing by a pair of bearings, the impeller is fixedly mounted on the end of the rotating shaft, the impeller is located between the liquid inlet and the liquid outlet, the input shaft is coaxially arranged with the rotating shaft, the input shaft is rotatably supported at one end of the casing, the end of the input shaft located outside the casing is connected to the input torque, the end of the input shaft located inside the casing is fixedly mounted with a magnetic outer sleeve, the end of the rotating shaft corresponding to the input shaft is fixedly mounted with a magnetic inner sleeve, the magnetic inner sleeve and the magnetic outer sleeve cooperate to transmit torque, characterized in that, The shell includes a pump shell, a pump cover and an end cover connected in sequence. The liquid inlet and the liquid outlet are located in the pump shell, and the rotating shaft is supported in the pump cover. At least one heat exchange chamber is provided in the pump cover. The heat exchange chamber is connected to a heat exchange medium interface. The heat exchange contact interface passes through circulating hot water. An isolation sleeve is provided on the shaft end of the rotating shaft close to the input shaft. The isolation sleeve is located between the magnetic outer sleeve and the magnetic inner sleeve. One end of the isolation sleeve close to the input shaft is closed, and the other end of the isolation sleeve is sealed with the inner wall of the heat exchange chamber in the pump cover, and the outer wall of the isolation sleeve is sealed with the isolation ring in the heat exchange chamber.

2. A fully insulated magnetic pump structure according to claim 1, characterized in that: The isolation sleeve is a double-layer isolation sleeve, the inner isolation sleeve is separated between the inner cavity of the pump cover and the end cover, and the outer isolation sleeve is separated between the heat exchange cavity and the end cover.

3. A fully insulated magnetic pump structure according to claim 1, characterized in that: The rotating shaft is a hollow rotating shaft, and both ends of the rotating shaft are connected to the interior of the inner isolation sleeve and the interior of the pump casing.

4. A fully thermally insulated magnetic pump structure according to claim 1, characterized in that: The pump housing is provided with a flushing port, which is communicated with the inner cavity of the inner isolation sleeve.

5. A fully thermally insulated magnetic pump structure according to claim 1, characterized in that: The end of the input shaft corresponding to the rotating shaft is fixedly installed with a magnetic frame, the magnetic outer sleeve is fixedly installed inside the magnetic frame, the end of the rotating shaft corresponding to the input shaft is fixedly installed with a magnetic disk, and the magnetic inner sleeve is fixedly installed with the magnetic disk.

6. A fully thermally insulated magnetic pump structure according to claim 5, characterized in that: One end face of the bearing is matched with the shaft shoulder of the rotating shaft, and a mechanical sealing ring is provided between the other end face of the bearing and the corresponding magnetic disk or impeller.

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