Magnetic driver with heating device in isolation sleeve

Abstract

The utility model relates to a magnetic driver with a heating device in an isolation sleeve. The magnetic driver comprises an outer rotor, an inner rotor, the isolation sleeve, the heating device and a motor, the central position of the end socket of the isolation sleeve is recessed from the central axis of the isolation sleeve to the opening end of the isolation sleeve to form or be connected with a barrel-shaped structure, and the whole or most of the heating main body of the heating device is arranged in the barrel-shaped structure; a blind hole is formed in the shaft of the inner rotor from one end, close to the end socket, of the inner rotor along the central axis of the inner rotor; the barrel-shaped structure is at least partially inserted into the blind hole in a sleeved mode, and the outer wall of the barrel-shaped structure is not in contact with the hole wall of the blind hole. According to the utility model, the problem of solidification or crystallization of a medium in the spacer sleeve is effectively solved, and meanwhile, preheating and / or heat tracing of the spacer sleeve and matched parts in the spacer sleeve can be realized as required.

Description

Technical Field

[0001] The utility model relates to a heating device, in particular to a heating device in an isolation sleeve of a magnetic transmission device. Background Art

[0002] In many cases, people use magnetic pumps with isolation sleeves to transport media to avoid leakage, such as Figure 3 As shown in , when the magnetic pump is running, the eddy currents of the inner and outer magnetic rotors heat the isolation sleeve 4. In order to cool the isolation sleeve 4 and cool and lubricate the bearing 7, a part of the medium is driven from the pump outlet into the circuit in the isolation sleeve 4 and then flows back to the pump inlet; when the pump stops running, due to the temperature drop, some of the medium remaining in the isolation sleeve 4 (such as the lead-bismuth alloy with a melting point of more than 270 degrees used in nuclear power, and the molten salt with a melting point of about 306 degrees used in solar power generation devices) will solidify or crystallize between the isolation sleeve 4 and the inner rotor 3, causing the magnetic pump to be unable to operate normally when it is turned on again. To avoid such a situation, it is not very realistic to discharge all the medium in the isolation sleeve 4 when the pump is stopped; and if the heating device is coated on the outside of the isolation sleeve 4, the magnetic force transmission distance between the magnetic steel on the outer rotor 2 and the inner rotor 3 will be greatly increased, making the magnetic pulling force between the inner and outer rotors very small or almost non-existent, thereby limiting the use of magnetic pumps in such occasions. In addition, as mentioned above, the existing isolation sleeve cannot keep warm or provide heat tracing. When the weather is cold, some of the media remaining in the isolation sleeve will freeze and thus damage the equipment. Summary of the invention

[0003] In view of the above problems existing in the prior art, the utility model discloses a magnetic transmission device with a heating device in an isolation sleeve.

[0004] The technical solution of the utility model is achieved in this way:

[0005] A magnetic transmission device with a heating device in an isolation sleeve comprises an outer rotor, an inner rotor, an isolation sleeve, a heating device and a motor, wherein:

[0006] The isolation sleeve is recessed along its central position on the end cap (or also called the end cap) toward the open end of the isolation sleeve along its central axis to form or connect a barrel-shaped structure for accommodating the heating body of the heating device, that is, the heating body of the heating device is placed in its entirety or in large part in the barrel-shaped structure; correspondingly, a blind hole is provided on the shaft of the inner rotor along its central axis from the end near the end cap so that the barrel-shaped structure can be inserted therein without contact, that is, the barrel-shaped structure and the blind hole are placed without contact, in other words, the outer radial dimension of the barrel-shaped structure is smaller than the inner diameter of the blind hole.

[0007] Furthermore, the motor shaft is a hollow shaft provided with a through hole along its central axis and is coaxial with the shaft of the inner rotor;

[0008] At least a part of the heating device passes through the through hole of the hollow shaft and is fixedly supported by a bracket outside the motor; the heating device is in non-contact with the hollow shaft.

[0009] Specifically, the heating device is an electric heating rod, and the rigid protective tube for sleeving the power cord passes through the hollow shaft and is fixedly supported by the bracket.

[0010] Alternatively, the heating device is a U-shaped heating tube, and the inlet end and the outlet end of its heating medium are fixedly supported by the bracket; the heating medium is steam or heat-conducting oil.

[0011] Furthermore, in order to facilitate temperature monitoring, a temperature sensor can be installed on the isolation sleeve. The sensor can be installed at a position near the flange at the open end of the isolation sleeve, or at the head position of the isolation sleeve.

[0012] Compared with the prior art, the beneficial effects of the present utility model include:

[0013] The present utility model can effectively and conveniently solve the problem of medium solidification or crystallization in the isolation sleeve through heating; at the same time, preheating and / or tracing heat of the isolation sleeve and its internal supporting parts can be realized according to the needs of specific occasions. For example, the residual medium in the isolation sleeve will be very viscous at low temperatures, which affects the startup of the equipment; another example is that after the high-temperature boiler feedwater magnetic pump stops running, the water remaining in the isolation sleeve will freeze at low temperatures, thus affecting the re-operation of the equipment or even damaging the equipment; in such scenarios, the technical solution and technical idea of the present utility model can easily solve the problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of a magnetic drive with a heating device in an isolation sleeve described according to an embodiment of the present utility model;

[0015] Figure 2 is a schematic structural diagram of another magnetic drive with a heating device in an isolation sleeve described according to an embodiment of the present utility model;

[0016] Figure 3 is a schematic structural diagram of a certain related magnetic drive in the prior art;

[0017] In the figure:

[0018] 1. Motor; 1-1. Motor shaft (hollow shaft); 1-11. Through hole of the hollow shaft; 1-1’. Motor shaft (non-hollow shaft);

[0019] 2. Outer rotor;

[0020] 3. Inner rotor; 3-1, 3-1'. Inner rotor shaft; 3-11. Blind hole on the inner rotor shaft; 3-2. Permanent magnet or magnetic conductor

[0021] 4. Isolation sleeve 4-1. Head 5. Barrel structure

[0022] 6. Bearing housing

[0023] 7. Bearing

[0024] 8. Flange

[0025] 9. Electric heating rod 9-1. Power cord 9-2. Rigid protective tube

[0026] 10. Temperature sensor

[0027] 11. U-shaped heating tube A. Heating medium inlet end B. Heating medium outlet end

[0028] 12. Bracket Detailed implementation manners

[0029] The present utility model will be further specifically described in conjunction with embodiments

[0030] In at least one embodiment of the present utility model, the magnetic drive with a heating device in the isolation sleeve is as Figure 1 shown, and includes a motor 1, an outer rotor 2, an inner rotor 3, an isolation sleeve 4, a bearing housing 6, a bearing 7, a flange 8, and a heating device placed in the isolation sleeve. Among them,

[0031] At the central position of the head 4-1 of the isolation sleeve 4, a barrel structure 5 is recessed along its central axis towards the open end of the isolation sleeve 4 for placing the heating device

[0032] The heating body of the heating device is wholly or mostly placed in the barrel structure 5. In at least one embodiment, the heating device adopts an electric heating rod 9, as Figure 1 shown. Considering the safety, stability and convenient replacement in use, the electric heating rod 9 is fixedly connected to the barrel structure 5 in a detachable manner at the barrel opening position of the barrel structure 5, for example, it can adopt threaded connection

[0033] Corresponding to the barrel structure 5, a blind hole 3-11 is opened along the central axis of the shaft 3-1 of the inner rotor from the end near the head 4-1; Most of the barrel structure 5 is inserted into the blind hole 3-11, and there is no contact between the outer wall of the barrel structure 5 and the hole wall of the blind hole 3-11

[0034] The motor shaft is a hollow shaft 1-1 provided with a through hole 1-11 along its central axis and is coaxial with the shaft 3-1 of the inner rotor

[0035] The power cord 9-1 of the electric heating rod 9 is sleeved in the rigid protection tube 9-2 and passes through the through hole 1-11 of the hollow shaft 1-1, and is fixedly supported by the bracket 12 arranged outside the motor 1; wherein, the whole of the electric heating rod 9 (including its heating body, the power cord 9-1 and its rigid protection tube 9-2) has no contact with the hollow shaft 1-1.

[0036] In at least one embodiment of the present invention, the heating device adopts a rigid U-shaped heating tube 11, as Figure 2 shown, and its heating medium adopts steam or heat-conducting oil; the U-shaped heating tube 11 is partially inserted into the blind hole 5 on the isolation sleeve, and as described above, the U-shaped heating tube 11 is fixedly connected to the barrel-shaped structure 5 in a detachable manner at the barrel mouth position of the barrel-shaped structure 5, and passes through the through hole 1-11 on the hollow shaft 1-1 of the motor. The inlet end A and the outlet end B of the heating medium extend to the outside of the motor and are fixedly supported by the bracket 12 arranged outside the motor 1; similarly, the whole of the U-shaped heating tube 11 has no contact with the hollow shaft 1-1.

[0037] Considering the convenience of temperature measurement and control, a temperature sensor 10 can be arranged on the isolation sleeve 4 near the flange 8 side, as Figure 1 and Figure 2 shown; the temperature sensor can also be fixed on the head 4-1 (not shown in the figure). At this time, its signal wire can be set to pass through the through hole 1-11 on the hollow shaft 1-1 without contact.

[0038] The above embodiments are only partial embodiments of the present invention, not all embodiments. On this basis, any technical solution obtained by a person skilled in the art in the technical field of the present invention by equivalent substitution or change within the technical scope disclosed by the present invention without creative labor based on the technical solution and inventive concept of the present invention should be covered by the protection scope of the present invention.

Claims

1. A magnetic drive with a heating device inside an isolation sleeve, comprising: An external rotor (2), an internal rotor (3), a spacer sleeve (4), a heating device and a motor (1), characterized in that: The spacer sleeve (4) is recessed or connected to form a barrel-shaped structure (5) at the central position of its head (4-1) along its central axis towards the open end of the spacer sleeve (4); A blind hole (3-11) is provided on the shaft (3-1) of the internal rotor along its central axis from one end near the head (4-1); At least a part of the barrel-shaped structure (5) is inserted into the blind hole (3-11), and there is no contact between the outer wall of the barrel-shaped structure (5) and the hole wall of the blind hole (3-11); The heating body of the heating device is wholly or mostly placed inside the barrel-shaped structure (5).

2. The magnetic drive according to claim 1, characterized in that: The motor shaft (1-1) is a hollow shaft provided with a through hole (1-11) along its central axis and is coaxial with the shaft (3-1) of the internal rotor; At least a part of the heating device passes through the through hole (1-11) of the hollow shaft and is fixedly supported by a bracket (12) outside the motor (1); the heating device has no contact with the hollow shaft.

3. The magnetic drive according to claim 2, characterized in that: The heating device is an electric heating rod (9), and a rigid protective tube (9-2) for sleeving a power cord (9-1) thereof passes through the hollow shaft of the motor and is fixedly supported by the bracket (12).

4. The magnetic drive according to claim 2, characterized in that: The heating device is a U-shaped heating tube (11), and the inlet end and the outlet end of its heating medium are fixedly supported by the bracket (12); the heating medium is steam or heat-conducting oil.

5. The magnetic drive according to claim 1, characterized in that: A temperature sensor is fixed on the spacer sleeve (4).

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