WO2009124510A1

WO2009124510A1 - Air-cooled molten aluminum permanent magnet pump

Info

Publication number: WO2009124510A1
Application number: PCT/CN2009/071223
Authority: WO
Inventors: 李宸
Original assignee: 北京远望高桥磁能技术有限公司
Priority date: 2008-04-10
Filing date: 2009-04-10
Publication date: 2009-10-15

Abstract

An air-cooled molten aluminum permanent magnet pump has a sealed pipe (35), a main electromotor (12), a rotor module (36) with permanent magnets (16), a forced-air cooling device (15) and a lifting device (32). The permanent magnets (16) are respectively arranged on one or both of the upper and lower sides, or inside of the sealed pipe ( 35). The rotor module (36) is arranged inside the sealed pipe (35). The forced-air cooling device (15) is used to lower the temperature in the permanent magnet pump. The rotor module (36) connected to the main electromotor (12) connects with the lifting device (32). When the temperature in the permanent magnet pump is too high, the lifting device (32) will hoist the rotor module (36) out of said pump, thus protecting the permanent magnets (16) from damage due to high temperature. The permanent magnet pump is characterised by energy-saving, high efficiency, low costs and high reliability.

Description

Air-cooled aluminum liquid permanent magnet pump

The present invention relates to an air-cooled permanent magnet pump, and more particularly to a new apparatus suitable for controlling high-temperature aluminum alloy melt in a highly efficient isothermal circulating flow in a melting furnace, a holding furnace and a pipe.

Background technique

In the process of smelting non-ferrous metal aluminum, in order to improve the quality of the aluminum alloy, reduce energy consumption and reduce burning, various alloying elements are added and uniformly mixed during the smelting process. There are a variety of metal melt mixing equipment available, among which the aluminum liquid pump is recognized as the best circulating stirring device. The aluminum melt can be circulated in a certain direction and flow rate in the molten pool, so that the aluminum melt in the melting furnace is fully and rapidly mixed and the upper and lower temperature difference of the melt is eliminated, so that the temperature of the aluminum melt is uniform. .

The known aluminum liquid pumps in the world include aluminum liquid electromagnetic pump and aluminum liquid mechanical pump, among which the British EMP electromagnetic pump and the US Metaul l i cs mechanical pump are the most representative. The common characteristics of the above two aluminum liquid pumps are high efficiency, which can quickly, effectively and fully circulate and agitate the aluminum liquid in the melting furnace to reduce the burning loss, thereby saving a large amount of energy and improving the quality of the aluminum alloy. From the published information, the aluminum water mechanical pump and the aluminum water electromagnetic pump can make the high-temperature aluminum melt capacity per hour through the pump body reach 300~1000 tons. However, they also have many disadvantages: The electromagnetic pump is a non-contact circulating stirring device, which is expensive. The electromagnetic induction coil needs a liquid circulation cooling system to reduce the temperature. The power distribution system is complicated, the power consumption is large, and it cannot work continuously for a long time. The attached cooling equipment covers a large area. Because of the above shortcomings of the aluminum liquid electromagnetic pump, its current application is less. The aluminum liquid mechanical pump is a contact type circulating stirring device. Due to its direct contact with the high temperature aluminum melt, it requires a complicated protection system, otherwise it is easy to cause contamination of the aluminum liquid; the rotating impeller and pump of the aluminum liquid mechanical pump The body needs to be immersed in the aluminum liquid, which is easily worn and damaged, and has a short service life and high annual maintenance cost. This also limits the widespread use of aluminum liquid mechanical pumps.

Summary of the invention

The object of the present invention is to improve the deficiencies of the existing aluminum liquid circulation pump, and to provide a new air-cooled aluminum liquid permanent magnet pump with high energy saving, high efficiency, low cost and no pollution.

The air-cooled aluminum liquid permanent magnet pump provided by the invention comprises a circular annular silicon carbide sealing pipe, a pump body, a main shaft, a permanent magnet fixing plate, a neodymium iron boron permanent magnet, a main motor and a transmission thereof, and a forced air cooling device; wherein:

The sealing pipe is installed in the pump body, and a heat insulating layer composed of a heat resistant material is disposed outside, and two ports of the sealing pipe protrude outside the pump body; the permanent magnet is fixed on the main shaft a fixing plate on which a yoke (which may be made of pure iron) is inlaid, the NdFeB permanent magnet is fixed on the fixing plate by the yoke and the NdFeB permanent magnet is distributed The upper and lower sides of the toroidal silicon carbide sealing pipe or one side thereof or the inner side thereof, the main motor is connected to the main shaft by a transmission device, so that the main motor drives the permanent magnet to carbonize along the circular ring The silicon sealing pipe is circularly moved; the pump body is made of austenitic stainless steel material; the forced air cooling device comprises a fan, a circulation air duct disposed in the pump body, and an outlet of the fan is connected to an inlet of the circulation air duct, The outlet of the circulation duct is in communication with the outside of the pump; a temperature sensor is disposed in the pump body.

The permanent magnet is composed of a plurality of sets of neodymium iron boron magnetic steel, which are fixed in groups on the yoke inlaid on the permanent magnet fixing plate.

The working process of the above device is: driving the permanent magnet to rotate circumferentially outside the annular silicon carbide sealing pipe under the driving of the main motor to generate a moving magnetic field, and the magnetic field line is rapidly cut in the circular sealing pipe. High temperature aluminum liquid, resulting in Lorentz force, in the toroidal silicon carbide seal The liquid aluminum liquid in the pipe is equivalent to the rotor, and the rotating permanent magnet is equivalent to the stator, thereby pushing the rapid flow of the aluminum melt in the annular pipe.

In use, combined with a power distribution control system, the power distribution control system controls the rotation speed of the main motor by, for example, controlling the rotation speed of the permanent magnet, thereby controlling the annular silicon carbide sealing pipe of the aluminum liquid permanent magnet pump. Liquid pressure and aluminum liquid flow rate; at the same time, the temperature sensor disposed in the pump body monitors the temperature of the pump body in real time, and controls the operation of the forced air cooling system through the power distribution control system, and timelyly the pump body and the permanent magnets therein Wait for cooling. The power distribution control system is prior art and will not be described here.

The fixing plate may be made of austenitic stainless steel, and the yoke embedded on the fixing plate constitutes a special magnetic circuit structure, and a plurality of sets of permanent magnets are fixed on the yoke.

The permanent magnets can be divided into several groups (even numbers). The calculated permanent magnets can be divided into 6~12 groups, and each group has several pieces of magnetic steel distributed on the upper and lower sides or inside of the annular silicon carbide sealing pipe. . This special design is to make the permanent magnet move rapidly in the circumferential direction under the driving of the main motor and generate Lorentz force. The two sets of NdFeB permanent magnets adjacent to the sealed pipe have opposite polarities, and the uniform magnetic line direction is perpendicular to the pipe.

The shape structure of the yoke on the fixing plate may be a radial bracket structure centered on the main shaft, and the bracket may be a 4-6 aliquot structure, preferably divided into 4 quarters or 6 equal divisions in the circumference, in each radial position. A plurality of sets of permanent magnets are fixed on the yoke arranged inlaid on the bracket.

The pump body is a structural support steel frame of austenitic stainless steel material, and an austenitic stainless steel plate is attached and fixed. The pump body may be a box-shaped or barrel-shaped structure, and a ventilation window is arranged on the pump body, and a circulating air passage for generating a circulating air flow is arranged inside the pump body and connected to the ventilation window. The forced air cooling system guides the cold air forcedly blown into the pump body to the permanent magnet through the circulation air passage, effectively taking away the heat on it to ensure that the temperature of the permanent magnet is within the normal range. The sealing pipe may be provided with a flange and an external connection on the pipe port of the inlet hole and the outlet hole penetrating from the pump body.

The austenitic stainless steel pump body with box shape or barrel structure has low magnetic permeability, does not interfere with the magnetic circuit design inside the pump body, and ensures the stability of the magnetic field. The circulation air passage and the ventilation window in the pump body can be combined with the air cooling system. Reduce the temperature inside the pump quickly and efficiently.

The temperature sensor may be installed around the circumference of the annular silicon carbide sealing pipe in the pump body for monitoring the air temperature inside the pump body, and the air temperature setting value in the pump body is based on the Curie temperature of the permanent magnet. Calculated, the effective working point of the permanent magnet changes with its demagnetization curve.

The forced air cooling system includes a fan, a temperature sensor and a control device connected thereto, and the control device causes the high pressure fan to start or stop according to the monitoring data feedback fed back by the temperature sensor, and the airflow enters the circulating airflow along the internal air passage from the air inlet of the pump body and passes through Cooling through the windshield to reduce the temperature and ensure the permanent magnets work safely and reliably.

The air-cooled aluminum liquid permanent magnet pump may further include an automatic protection system. Correspondingly, the neodymium iron boron permanent magnet and the fixed plate are distributed inside the annular silicon carbide sealing pipe.

The pulling mechanism as the automatic protection system may be a guide rail or a screw provided in the pump body and above, and the main shaft or the fixed plate may be connected to the guide rail in the direction of the guide rail or the screw by the transmission mechanism. Or on the lead screw, the drive mechanism is connected to the transmission mechanism. The drive mechanism can be a servo motor system that is controlled by a PLC. When the temperature inside the pump rises abnormally, the PLC controls the servo motor system to raise the distance between the main motor and the permanent magnet along the guide rail or the lead screw to protect the motor and permanent magnet from high temperature damage in the pump body. When the temperature drops back to the normal value, the servo system restores the main motor and permanent magnet to the original working position.

The toroidal silicon carbide sealing pipe is specially designed, one for the liquid inlet and the other for the It is a unidirectional type of outlet, and both ports can be used as two-way sealed pipes for inlet or outlet.

The process uses fine silicon carbide powder as a whole cast sintering or segment casting casting.

Segmented cast pipe, wherein each segment of the silicon carbide pipe is designed with a stop to facilitate mutual nesting, and a suitable fit clearance is left at the socket, wherein a high temperature sealing plug seal is provided Bonding.

A raised rib is formed on the outer wall surface of the port of the toroidal silicon carbide sealing pipe to facilitate reinforcement by austenitic stainless steel hoop.

A heat-resistant material is formed outside the silicon carbide pipe to form a heat insulating layer, which can reduce the heat transfer speed of the aluminum liquid in the silicon carbide pipe.

The following is a scheme for placing a permanent magnet in the middle of a circular non-metallic refractory sealing pipe: The air-cooled aluminum liquid permanent magnet pump provided by the present invention comprises a circular non-metallic refractory sealing pipe, Insulation box, a main frame, a lifting device, a rotor assembly, a main motor and its transmission, and a forced air cooling system. among them:

The outer wall of the annular non-metallic refractory sealing pipe is provided with a sintering solidified layer to solidify the whole and is placed in a heat insulating box matched with the shape, and the annular non-metallic refractory sealing pipe is two a port extending beyond the thermal insulation box; the rotor assembly includes a main shaft and a yoke fixed to the main shaft and a permanent magnet on the yoke and a magnetic steel cover that fixes the permanent magnet The main motor is connected to the main shaft of the rotor assembly by a transmission device to rotate, and the yoke, the magnetic steel cover and the permanent magnet thereon are driven in a circular shape at the center of the annular non-metallic refractory sealing pipe. Rotating motion in space; the thermal insulation box is made of austenitic stainless steel material; the lifting device is disposed on the main frame, and the main motor and the rotor assembly connected thereto are provided therein a thermal insulation box for a toroidal non-metallic refractory sealed pipe, one of which is disposed on the main frame and the other is disposed on the lifting device to drive the lifting device A relative displacement between the rotor assembly and the thermal insulation box causes the rotor assembly to enter or exit a circular space in the center of the annular non-metallic refractory sealing conduit; the forced air cooling system includes a fan and a setting At the circulation duct around the rotor assembly, the outlet of the fan is connected to the inlet of the circulation duct.

A temperature sensor can be placed on the components surrounding the rotor assembly, such as on the main frame or on the thermal insulation box. If the sensor is connected to the starting circuit of the driving motor of the elevator, the permanent magnet pump can be automatically protected. The elevator generates an action according to the design change requirement according to the temperature change value around the rotor assembly, and controls the rotor to rise or fall in the direction of, for example, the guide column;

When the air-cooled aluminum liquid permanent magnet pump is used, it can be combined with a power distribution control system, which controls the main motor speed by, for example, a frequency converter, that is, controls the rotational angular velocity of the permanent magnet, thereby controlling the aluminum liquid permanent magnet pump. The aluminum liquid pressure and flow rate in the annular non-metallic refractory sealing pipe; at the same time, the temperature sensor disposed around the rotor can be connected to a display, monitor the temperature change in real time, and control the forced wind through the power distribution control system The cold system works to cool the rotor and the permanent magnets on it in time. When the temperature exceeds the warning value, the power distribution control system can also control the operation of the lifting system, drive the rotor to rise or fall away from the high temperature environment, and realize the automatic protection function of the aluminum liquid permanent magnet pump.

The annular non-metallic refractory sealing pipe provided with the sintering solidified layer on the outer wall is disposed in the center of the heat insulating and heat insulating box, and the heat insulating material is provided with heat-resistant material wrapped around the sintering solidified layer of the pipe to constitute thermal insulation. Floor.

The lifting device includes an elevator and a guide post, the guide post is fixed on the main frame, and the elevator is provided with a lifting platform, and the main motor and the rotor assembly connected thereto are fixed on the lifting platform. The lifting platform is provided with a guiding column hole, and the guiding column is disposed in the guiding column hole, so that the lifting platform moves up and down along the guiding column under the driving of the lifting and transmitting mechanism, thereby effectively preventing the horizontal direction from shaking during the movement of the platform. The elevator is coupled to the main frame such that a platform thereon can be moved up and down relative to the main frame such that the main motor and rotor assembly disposed on the elevator is mounted in the circular ring disposed on the main frame The center of the thermal insulation box of the non-metallic refractory sealing pipe is displaced.

Specifically, the above-mentioned annular non-metallic refractory sealing pipe, thermal insulation box, lifting device, rotor assembly, main motor and its transmission device and forced air cooling system are jointly mounted on the main frame; The box is installed at the upper end or the lower end of the main frame. If the heat insulating box is installed at the lower end of the main frame, an auxiliary bracket may be fixed on the lower end surface of the main frame, and the heat insulating box is fixed on the lower end surface of the main frame by the heat insulating box, thereby Inverted use is realized, and the thermal insulation box and the main frame are fastened by bolts, which is easy to maintain and replace. Accordingly, the main motor and the rotor assembly connected thereto are mounted on the elevator.

The permanent magnet pump uses a permanent magnet as the power source, mainly using the magnetic field generated in the air gap. The size of Lorentz force is mainly based on the design of permanent magnet magnetic circuit, magnetic routing permanent magnet, yoke iron and air gap. The design of permanent magnet magnetic circuit is divided into two aspects. First, the performance of permanent magnet, magnetic circuit structure and magnetic circuit are known. Part of the size, the calculation of the magnetic field strength in the air gap is the magnetic properties, working gap and magnetic field strength of the known materials. It is required to calculate and determine the magnetic circuit structure and the size of the permanent magnet. Known conditions: conductivity of aluminum, cross-sectional area of pipe, ² , length of pipe ² ^, volume of permanent magnet ^, length of permanent magnet ^, effective air gap length, air gap volume, angular velocity of permanent magnet ", residual magnetization ^, magnetic field Strength coercive force ⁷ ^, demagnetizing field strength effective magnetic gap magnetic field strength ^, maximum magnetic energy product magnetomotive force ^1, etc. The principle of conservation of magnetic dynamic potential and the principle of flux continuity are:

φ = Β _Μ Α _Μ = Κβ _ί Α _ί (1)

- H _m L _m = K _r H _g L _g (2)

(1) (2) solved jointly

among them

φ magnetic flux

Magnetic flux density of B _m permanent magnet

B _g flux density in the effective air gap

Cross-sectional area of A _m permanent magnet

A _g effective air gap cross-sectional area

K _f magnetic flux leakage coefficient

K _r magnetomotive force loss coefficient

μ _ϋ vacuum permeability

Due to the magnetic flux leakage phenomenon in the magnetic circuit, magnetic flux loss exists in each part of the magnetic circuit, and the magnetic pressure drop of the magnetic circuit is not equal to the magnetomotive force of the permanent magnet. When the air gap size and the air gap magnetic field strength are known, the focus of the magnetic circuit design is how to optimize and .

According to the above principle, the present invention optimizes the magnetic flux leakage coefficient and the magnetomotive force loss coefficient by different ways of magnetic circuit structure optimization design and yoke iron inlay to minimize magnetic flux leakage. According to Faraday's law of electromagnetic induction, there are:

E = - = -(Β cos ωί) = 5osin ωί

E current intensity

Because: J = aE

J induced current density

The Lorentz force generated by the magnetic induction of permanent magnets is: ^F = JB

Where; [and the B direction are perpendicular to each other, therefore, the electromagnetic force density generated by the permanent magnet is:

F = aB ² ωsm cot = aEB

The main motor drive is a geared motor mounted on the pump body or on the main frame. The speed of the motor is controlled by the frequency converter, and the main shaft is connected to the fixed plate or the rotor of the yoke by the coupling, so that the permanent magnet moves rapidly in the circumferential direction and controls the rotational angular velocity of the permanent magnet.

The average value of the Lorentz force in the tangential direction at different angular velocities can be scientifically calculated to control the fluid pressure of the aluminum liquid permanent magnetic pump, the flow rate of the aluminum melt, and the like.

In the existing aluminum liquid circulation agitation device, there is no precedent for using a permanent magnet pump. One of the reasons is that a high-intensity air gap magnetic field cannot be formed to effectively promote the movement of the aluminum liquid. However, the present invention can greatly reduce the magnetic flux leakage by a special magnetic circuit structure design.

This air-cooled aluminum liquid permanent magnet pump is a new type of circulating agitation device, which combines the advantages of electromagnetic pump and mechanical pump, and overcomes their respective shortcomings. Air-cooled aluminum liquid permanent magnet pump has the characteristics of high energy saving, high efficiency, low cost and no pollution: Aluminum liquid permanent magnet pump can save more than 50% energy consumption compared with electromagnetic pump; Unique magnetic circuit design and air cooling The system design not only ensures the reliability of the system, but also eliminates the pollution; the loop design of the large diameter can exchange a larger volume of aluminum melt per unit time; the non-contact stirring method ensures the long service life of the equipment. The annual maintenance cost is greatly reduced; the special structural design and magnetic circuit design effectively reduce the leakage magnetic field problem of the large volume air gap, so that the air-cooled aluminum liquid permanent magnet pump can work efficiently and reliably. Further, in the permanent magnet pump of the present invention, a sintered solidified layer is provided on the outer surface of the annular annular non-metallic refractory material pipe, which can greatly improve the strength of the pipe and prolong its service life; and at the same time, has a heat-blocking effect. In addition, in the permanent magnet pump, the annular sealing non-metallic refractory pipe of the device in the thermal insulation box is fixed at the upper end or the lower end of the main frame, and when it is inspected and replaced, only The installation structure of the heat insulation box and the main frame can be disassembled, so that the maintenance, maintenance and replacement of the annular sealing non-metal refractory pipe is simple and convenient.

DRAWINGS

The invention will now be further described with reference to the accompanying drawings.

1 is a schematic structural view of an air-cooled aluminum liquid permanent magnet pump provided by the present invention;

2 is a schematic structural view of a toroidal silicon carbide sealing pipe of an air-cooled aluminum liquid permanent magnet pump according to the present invention;

2a is a schematic view showing the structure of the port of each segment of the silicon carbide tube of the sealed pipe shown in FIG. 2; FIG. 3 is another example of the annular silicon carbide sealing pipe of the air-cooled aluminum liquid permanent magnet pump provided by the present invention. Schematic;

4 is a schematic structural view of a toroidal silicon carbide sealing pipe of an air-cooled aluminum liquid permanent magnet pump provided by the present invention;

Figure 4a is a side view of the structure of Figure 4; 5 is a schematic structural view of a toroidal silicon carbide sealing pipe of an air-cooled aluminum liquid permanent magnet pump according to the present invention;

Figure 5a is a schematic side view of Figure 5;

6 is a front view showing a box type structure of a pump body of an air-cooled aluminum liquid permanent magnet pump according to the present invention;

Figure 6a is a top plan view of the pump body shown in Figure 6;

1 is a front view showing another cylindrical structure of a pump body of an air-cooled aluminum liquid permanent magnet pump provided by the present invention;

Figure 7a is a top plan view of the pump body shown in Figure 7;

Figure 8a is a schematic structural view of the take-up flange;

Figure 8b is another schematic structural view of the take-up flange;

9 is a schematic view showing another structure of an air-cooled aluminum liquid permanent magnet pump provided by the present invention;

10 is a schematic circuit diagram of a power distribution system provided by the present invention;

Figure 1 is a schematic view showing the use of the aluminum liquid permanent magnet pump;

12 is a schematic structural view of still another air-cooled aluminum liquid permanent magnet pump according to the present invention;

Figure 13 is a schematic view of the lifting system of the air-cooled aluminum liquid permanent magnet pump shown in Figure 12 driving the rotor down;

Fig. 14 is a structural schematic view showing the separation of the heat insulating box of the air-cooled aluminum liquid permanent magnet pump from the main frame; Fig. 14a and Fig. 14b are respectively structural diagrams of the heat insulating box and other devices on the main frame separated from the main frame;

Fig. 15a and Fig. 15b are respectively a front view and a top view of the four-part rotor assembly of the air-cooled aluminum liquid permanent magnet pump;

Fig. 16a and Fig. 16b are respectively a front view and a top view of the six-divided rotor assembly of the air-cooled aluminum liquid permanent magnet pump.

Fig. 17a and Fig. 17b are respectively a front view and a top plan view of another four-part rotor assembly of the air-cooled aluminum liquid permanent magnet pump.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and examples:

As shown in FIG. 1 and FIG. 9, the air-cooled aluminum water permanent magnet pump provided by the present invention comprises a circular annular silicon carbide sealing pipe 1 distributed on the upper and lower sides or the inner side of the annular silicon carbide sealing pipe 1. NdFeB permanent magnet 16, main motor 12 and its transmission, permanent magnet fixing plate 8 for fixing the yoke boron 6 of the NdFeB permanent magnet 16, pump body, high pressure air cooling system 15 and power distribution Control System;

The annular silicon carbide sealing pipe 1 is installed in the pump body, and the silicon carbide sealing pipe 1 is provided with an insulating layer 17 made of heat insulating material; the main motor 12 and its transmission device are connected to a main shaft 7 through the coupling 14, so that Rotating, the main shaft 7 is inserted into the pump body through the perforation 1 1 (as shown in Figs. 6a, 7a) provided at the middle of the pump body with respect to the annular sealing pipe 1, and is provided at upper and lower positions of the corresponding main shaft on the pump body. The bearing 19 supports the main shaft 7, and a fixing plate 8 in which the yoke 6 is fitted is fixed to the main shaft. A bearing housing 18 is provided on the lower base plate of the pump body, and the main shaft 7 is rotatably fixed to the bearing housing 18 via a bearing 19 such that the main shaft 7 is placed in the middle of the annular space of the annular sealing duct 1. The permanent magnets 16 are divided into groups (even numbers) on the fixed plate according to the scientific calculation of the magnetic circuit to form magnetic lines of force penetrating the sealed pipe. The Lorentz force is generated by the rapid movement of the magnetic lines along the pipeline, and the Lorentz force can be scientifically calculated with full consideration of various environmental parameters.

A permanent magnet fixing plate 8 with a yoke 6 embedded therein is fixed on the spindle cymbal, and the neodymium iron boron permanent magnet 16 is inserted The yoke 6 embedded in the permanent magnet fixing plate 8 is fixed to the permanent magnet fixing plate 8. As shown in FIG. 1 and FIG. 9, the fixing plate 8 is a radial fixing bracket fixed on the main shaft and centered on the main shaft. The bracket is equally divided by the circumference, which may have 4 equal parts or 6 on the circumference. The fixed frame structure. A pure iron yoke 6 and a permanent magnet 16 are fixed on the inner surface of the sub-mount, and the upper and lower two sets of opposite permanent magnets 16 have appropriate air gaps and opposite polarities. The permanent magnets 16 on the respective sub-mounts are located above the sealed duct 1 and the lower permanent magnets 16 are located below the sealed duct 1 (Fig. 1). A one-to-one corresponding magnetic flux loop is formed by the main shaft 7 communicating with the opposite polarity end of the permanent magnet 16, and the annular sealing duct 1 is placed in the magnetic field. The permanent magnet 16 can also be fixed in the space between the annular sealing ducts 1, as shown in FIG. The yoke 6 is embossed on the fixing frame by an equal division method, which can reduce magnetic leakage, and is a special design of the magnetic circuit structure.

In the above structure, the main motor is driven to make the permanent magnet move rapidly in the circumferential direction, and the rotational angular velocity of the permanent magnet can be conveniently controlled. It then regulates the Lorentz force that drives the aluminum in the sealed line.

In the prior art, there has been no example of circulating agitation using an aluminum liquid permanent magnet pump. This is because the magnetic circuit design of the permanent magnet is complicated, and the magnetic field force is very small. The permanent magnet has high requirements on the ambient temperature. Once the Curie temperature is exceeded, the demagnetization phenomenon occurs, and the magnetic field strength is linearly attenuated, and the directional flow of the aluminum liquid cannot be realized. purpose. However, the present invention seals the pipe by using the annular silicon carbide, and designs the heat insulating layer of the heat resistant material, and the permanent magnet is placed on the fixing plate of the yoke, so that the magnetic leakage phenomenon in the magnetic circuit is reduced. The magnetic field strength is greatly improved, and a large number of magnetic lines of force are concentrated through the sealed pipe. By adjusting the rotational angular velocity of the permanent magnet, the aluminum liquid in the sealed pipe can be effectively driven.

The toroidal silicon carbide sealing pipe 1 can be of both unidirectional and bidirectional types. As shown in Fig. 2 and 2a, the one-way structure, one of the port connecting portions 3 is suitable as a liquid inlet, and the other port 4 has a straight tube and a circular tube in a substantially tangent relationship, which is beneficial to the aluminum liquid. The outflow is suitable for making a liquid port, and the sealed pipe constitutes an open ring; Fig. 3 is another open annular sealing pipe, the aluminum liquid can flow in both directions; Fig. 2 and Fig. 3 show the sealed pipe in the same plane Both unidirectional and bidirectional structures. The sealed pipe shown in Figures 4 and 4a has a bidirectional structure, which forms a ring in the three-dimensional space, and the inlet and outlet pipe sections 3, 4 overlap a part, and the flow direction of the inlet and outlet fluids is substantially vertical, at the port There is a straight tube and a circular tube in a substantially tangential relationship, so both ports can be used as a liquid inlet and a liquid outlet. As shown in Figures 5 and 5a, it is also a two-way structure. Unlike the sealed pipe shown in Figure 4, the former annular pipe segment has only three-quarters of the circumference length, and in this example, the annular pipe segment is basically The entire length of the ring, and the overlapping portions of the straight pipe sections connected at the two ports have opposite fluid flows. Annular seal The shape of the pipe is designed so that the pipe is placed within the effective range of the high-intensity magnetic field of the rotating permanent magnet. The volume of the pump body is compact and the insulation performance is better. The choice of one-way or two-way silicon carbide tubing is primarily based on the user's smelting process requirements.

The annular silicon carbide sealing pipe 1 is formed by integral casting sintering or segment casting casting of fine silicon carbide powder, and the sealing pipe shown in Fig. 2, 2a and Fig. 3 is formed in sections, and the designed port sleeve is connected. Port 5, should be properly fitted with gaps and filled with high temperature bonding materials (such as fire mud) to seal, the port jacket is set with stainless steel hoop 2 to fasten. A rib can be designed on the outer wall of the tube in which the stainless steel hoop is placed, which is advantageous for setting the steel hoop. The annular silicon carbide sealing pipe is installed in the middle of the pump body. As shown in Fig. 1 and Fig. 9, the outer wall of the pipe is insulated and sealed by a heat insulating layer.

The pump body is a support structure steel frame made of austenitic stainless steel material, and an austenitic stainless steel plate is attached to the outside of the pump body so that the pump body is formed into a box shape (see Fig. 6) or a barrel shape (see Fig. 7). The main consideration of the stainless steel is the influence of the magnetic permeability of the material on the magnetic field, and the mechanical properties of the material are also considered. The inlet and the outlet hole 3a are provided on the pump body corresponding to the inlets and outlets 3, 4 of the sealed pipe 1. use The pump body is connected to the outside at both ends of the sealing pipe 1; a flange 9 (as shown in Figs. 8a, 8b) is mounted on the inlet and outlet. The heat-resistant layer 10 between the flange 9 and the sealed pipe prevents the aluminum liquid from being thermally conducted too fast, and has heat insulation and sealing and leakage prevention.

A temperature sensor is disposed in the pump body, and the high pressure air cooling system 15 is disposed on the pump body, and the air outlet is connected to the air inlet provided on the pump body. The power distribution control system is coupled to the main motor 12, the temperature sensor, and the high pressure air cooling system 15, such that the high pressure air cooling system 15 controlled by the temperature sensor generates a circulating air flow in the pump body and dissipates heat through the gas permeable window. The wind pressure of the fan can be determined according to the specific heat dissipation requirements.

As shown in Fig. 9, the power distribution control system of the permanent magnet pump shown in Fig. 9 controls the high pressure blower 15 through, for example, the inverter 23, the main motor 12, through the circuit breaker 24, the AC contactor 25, and the thermal relay 26. The permanent magnet pump shown in Fig. 1 also has such a basic circuit including the main motor 12 and the high pressure air-cooling system machine motor 15. The spindle 7 is controlled to rotate by the main motor 12, and the inverter 23 controls the rotation speed of the spindle to control the rotational angular velocity of the permanent magnet 16, thereby controlling the liquid pressure and the flow rate of the aluminum liquid in the annular silicon carbide sealing pipe of the aluminum liquid permanent magnet pump. At the same time, the temperature sensor disposed in the pump body monitors the temperature of the pump body in real time, and the temperature controls the high pressure air cooling system 15 through the temperature sensor, and timely cools the pump body to ensure the effective operation of the permanent magnet.

The air-cooled aluminum liquid permanent magnet pump may further comprise an automatic protection system applied to the air-cooled aluminum liquid permanent magnet pump as shown in FIG. It is a set of pulling mechanism which can project the spindle Ί and the permanent magnet fixing plate 8 on which the permanent magnet 16 is attached, which is connected to the pump body. Here, the outer diameter of the permanent magnet fixing plate 8 fixed to the main shaft 7 and the yoke 6 and the permanent magnet thereon are smaller than the diameter of the intermediate circular cross-sectional space 1 1 of the sealing pipe 1, and the permanent magnet fixing plate and the permanent magnet are both disposed. Inside the ring of the sealed pipe 1. The main shaft 7 is vertically movable and rotatably fixed in the pump body. The main shaft is connected with a driving device, that is, a servo motor 20, and the driving device 20 and the main shaft 7 are provided with a pulling transmission mechanism 21, for example, a screw transmission. mechanism. The specific structure of the automatic protection system in the permanent magnet pump shown in FIG. 9 may be: a cylinder made of austenitic stainless steel, which is inserted in the middle of the ring of the sealed pipe 1 in the pump body, in the cylinder The bearing seat 18 is disposed at the bottom, and the bearing 19 is matched with the bearing housing 18 so that the main shaft 7 is rotatably fixed to the lower bottom plate of the cylinder. A connecting plate is disposed on the uppermost permanent magnet fixing plate 8 of the main shaft 7, and when the main shaft is inserted into the hole of the sealing pipe in the hole 1 1 of the pump body, the lower bottom plate of the cylindrical body is supported at On the lower bottom surface of the pump body, the connecting plate covers the hole 1 1 on the pump body. The main motor 12 is connected to the main shaft 7 above the connecting plate via a coupling 14 as shown in FIG. The connecting plate is provided with a perforation, and at least three screws are disposed. The lower end of the screw is rotatably fixed to the pump body, and a nut is connected to the screw, and the servo motor 20 is connected to the screw through a transmission mechanism. When the servo motor rotates, the screw can be rotated, and the connecting plate can be raised or lowered by the nut, so that the main shaft and the permanent magnet thereon can be put into the pump body or put back into the pump body. The stroke switch can be arranged in the pump body corresponding to the support of the cylinder body, and the servo motor is stopped by the stroke switch when the spindle is returned to the pump body and the cylinder body falls to the bottom of the pump body. A stroke-switch can also be provided at the corresponding position above the pump body to control the spindle to be lifted out of the upper position of the pump body. The pulling drive mechanism can also be a mechanism that converts other rotations into linear motion. Thus, the rotation of the servo motor causes the screw to move up and down, and then the spindle is moved up and down to pull the permanent magnet fixing plate and the permanent magnet thereon from the pump body or put it back into the pump body. The schematic diagram of the circuit structure of the permanent magnet pump is shown in FIG. 10. On the basis of the permanent magnet pump shown in FIG. 1, a circuit for composing the servo motor 20, such as the servo motor 20 (used in the example shown in FIG. 9), is added ( The content of the dotted line in Fig. 10), the temperature sensor controls the servo motor 20 through the circuit breaker 24. The drive is coupled to the power distribution control system and is controlled by the temperature sensor. As shown in FIG. 9, the pulling device is a guide rail or a lead screw 21 fixed to the upper portion of the pump body and connected to a servo motor device 20, and the guide rail or the lead screw 21 is connected to the main motor 12 and the main shaft 7. When the temperature inside the pump body is overheated When the abnormality occurs, the servo motor unit 20 is activated, so that the main motor 12, the spindle cymbal and the permanent magnet 16 connected to the guide rail or the lead screw 21 are quickly lifted out from the pump body, and the forced air cooling system will be When the pump body cools down to the appropriate temperature of the permanent magnet 16, the automatic protection system is started again, and the main shaft 7 and the permanent magnet 16 are sent back to the pump body to restore the original working state. In this way, it is ensured that the permanent magnet does not exceed the Curie temperature during operation to cause demagnetization. A heat-resistant material is disposed outside the silicon carbide pipe to form the heat insulating layer 10 to reduce the outward heat transfer rate of the aluminum liquid in the silicon carbide pipe.

The permanent magnets 16 can be divided into several groups, each of which has a plurality of magnetic steels distributed on the upper and lower sides (Fig. 1) or the inner side of the annular silicon carbide sealing pipe (Fig. 9). The aluminum liquid is equivalent to the rotor during operation, and the moving permanent magnet is equivalent to the stator, which can promote the flow of the aluminum melt in the pipeline.

In operation, the main motor 12 transmission is coupled to the main shaft via a coupling 14, and the permanent magnet 16 is dragged for circular motion. The high-pressure air-cooling system 15 blows high-pressure airflow through the air inlet of the tank, flows along the circulating air passage in the pump body, and rapidly dissipates heat through the ventilation window of the tank to ensure that the effective working point of the permanent magnet does not occur under a stable temperature environment. It changes downward along the demagnetization curve point. A servo system composed of a guide rail or a screw 21 and a servo motor 20 is provided in the pump body and above. When the temperature rises abnormally, the servo system composed of the servo motor 20 and the like raises the main motor 12 and the permanent magnet 16 by a distance in the direction of the guide rail or the lead screw 21, and protects the motor 12 and the permanent magnet 16 from high temperature damage in the pump body. When the temperature falls back to the normal value, the servo system 20 restores the main motor 12 and the permanent magnet 16 to the working position, and the aluminum liquid permanent magnet pump continues to operate.

The structural composition of the aluminum liquid permanent magnet pump during use is shown in Fig. 11. It can be seen from Fig. 11. The inlet port of the aluminum liquid permanent magnet pump is installed on the side of the aluminum outlet 28 of the melting furnace 27, and is pushed. The aluminum liquid rapidly forms a specific vortex in the feed treatment well 30, and then returns to the smelting furnace 27 through the aluminum inlet port 29. The aluminum liquid permanent magnet pump allows sufficient and rapid mixing of the aluminum liquid in the melting furnace. The 18KW aluminum liquid permanent magnet pump A can produce a speed of 6~8 meters per second through 10 tons of aluminum liquid per minute. Depending on the diameter of the silicon carbide tube, the aluminum liquid can be transported from 1 ton/min to 20 tons / min. The aluminum liquid permanent magnet pump has a size radius of about 1-1 . 5m and a weight of about 3 tons. It can be used in a variety of strict conditions.

12 and FIG. 13 are another embodiment of the air-cooled aluminum liquid permanent magnet pump provided by the present invention, including a main motor and transmission 12, a main frame 31, a lifting device 32, a coupling 14, and a bearing. 19. Insulation box 33, sintered solidified layer 34, annular non-metallic refractory sealing pipe 35, rotor assembly 36, rotor assembly outer support cylinder 37, magnetic steel cover 38, permanent magnet 16, yoke 6, high pressure wind Cold system 15 inlet 39 and so on. The main motor and the transmission 12 are rotated by the coupling 14 and the bearing 19 to the main shaft of the rotor assembly 36. The rotor assembly 36 is provided with a magnetic steel cover 38, a permanent magnet 16, a yoke 6, and a rotor assembly 36. 19 fixed in the outer support cylinder 37 of the rotor assembly, which are jointly mounted on the lifting device 32; the lifting device 32 is composed of an elevator, a guide column and a sensor, and is mounted on the main frame 31 to enable the main motor and the transmission device 12, The shaft 14, the bearing 19, the rotor assembly 36, the rotor assembly outer support cylinder 37, the magnetic steel cover 38, the permanent magnet 16, the yoke 6, the forced air cooling system inlet 39, etc. together in the direction of the guide column are annular non-metallic fireproof The center of the material sealing pipe 35 is raised and lowered;

The annular non-metallic refractory sealing pipe 35 is installed in the heat insulating box 33, and the annular non-metallic refractory sealing pipe 35 is provided with a sintering solidified layer 34; the heat insulating box 33 is installed at the upper end of the main frame 31 or The lower end, as shown in Fig. 13, the permanent magnet pump, the heat insulating box 33 is installed at the upper end of the main frame 31. If it is installed at the lower end of the main frame, it is usually necessary to fix an auxiliary bracket on the lower end surface of the main frame, The heat insulation box is disposed on the lower end surface of the main frame through the auxiliary bracket, that is, inverted on the auxiliary bracket, and the heat insulation box 33 is made of austenitic stainless steel material, and is bolted tightly with the main frame. Solid connection, easy to maintain and replace. As shown in Figs. 14, 14a, 14b, the heat insulating box 33 and the duct 35 provided therein are removed from the main frame. When the pipe 35 is damaged, it can By unscrewing the bolts, the main motor is driven to lower the rotor assembly from the circular space in the middle of the thermal insulation box by means of the lifting device, and the thermal insulation box 33 can be removed for maintenance or replacement. The main motor of the permanent magnet pump, the main frame and other components thereon can be left motionless.

The main motor and the transmission device 12 are connected to the main shaft of a rotor assembly 36 through the coupling 14 and the bearing 19 to rotate, and the permanent magnet 16 is rotated by the rotation of the rotor assembly 36. The upper and lower ends of the main shaft of the rotor assembly 36 are provided. Bearing 19 supports rotor assembly 36. The permanent magnet 16 is fixed to the yoke 6 and protected by a magnetic steel cover 38. According to the scientific calculation of the magnetic circuit, the permanent magnet 16 on the rotor assembly 36 is divided into a plurality of pairs of polar moments (even numbers) to form a through-circular non-metal. The refractory seals the magnetic lines of force of the conduit 35. The magnetic force line produces a Lorentz force for the rapid cutting movement of the aluminum liquid in the annular non-metallic refractory sealing pipe 35. The Lorentz force causes the aluminum liquid to flow, and can be scientifically calculated under the consideration of various environmental parameters. Lenzi force size.

The permanent magnet 16, the yoke 6, and the magnetic steel cover 38 on the rotor assembly 36 together form a radial support centered on the main axis of the rotor assembly 36, which may have 4 divisions, 6s, etc. on the circumference of the main shaft of the rotor assembly. An even-numbered radial stent structure that is divided into, or equally divided by, or 10 equal parts, or more. The four- and six-part rotor structures of the air-cooled aluminum liquid permanent magnet pump are shown in Figures 15a and 15b and Figures 16a and 16, respectively. 17a, 17b are another four-part rotor structure having a heat insulating protective layer, and the yoke 6 is a vertically disposed flat plate which is perpendicular to each other in a cross shape, and the outer end of the flat yoke 6 is connected to the fixing plate 8 The wedge-shaped space between the yoke cross-shaped flat plate and the fixed plate 8 is filled with the permanent magnet 16, and a magnetic steel cover 38 is disposed at the outer end of the fixed plate 8, and the permanent magnet 16 is sealed in the wedge-shaped space to form an aggregate. A cylinder 17a is added to the outside of the assembly, and a heat insulating material is formed in the gap between the cylinder and the assembly to form a heat insulating protective layer 17. In operation, the permanent magnet 16 on the rotor 36 rotates in the center of the toroidal sealed non-metallic refractory sealing conduit 35. The lifting device 32 includes an elevator and a guide post. The guide post is fixed on the main frame 31. The elevator is provided with a lifting platform. The main motor 12 and the rotor assembly 36 connected thereto are fixed on the lifting platform, and the lifting platform is arranged. a guide post hole, the guide post is disposed in the guide post hole, so that the lifting platform is driven up and down along the guide column driven by the lifting and lowering mechanism, thereby effectively preventing the horizontal direction from shaking during the movement of the platform, the elevator and the main frame Connecting such that the platform thereon can be moved up and down relative to the main frame such that the main motor and rotor assembly disposed on the elevator is mounted on the main frame with the annular sealed non-metallic refractory sealed conduit The displacement of the center of the thermal insulation box is changed.

The motor on the elevator in the lifting device 32 can be activated as needed to move the lifting platform up and down relative to the main frame, and drive the main motor and transmission 12, the coupling 14, the bearing 19, the rotor assembly 36, and the rotor assembly outer support cylinder 37. The magnet cover 38, the permanent magnet 16, the yoke 6, the inlet 39 of the high pressure air cooling system 15, and the like are lifted up and down at the center of the annular non-metallic refractory sealing pipe 35 (as shown in Fig. 13).

With the above structure, the rotor assembly 36 is driven by the main motor and the transmission unit 12 to rapidly rotate the upper permanent magnet 16 in the forward or reverse direction, so that the rotational angular velocity of the permanent magnet can be accurately controlled. The size of the Lorentz force of the aluminum liquid in the annular non-metallic refractory sealing pipe 35 is then regulated.

An example of circulating agitation using an aluminum liquid permanent magnet pump has not been found so far. Mainly because the aluminum liquid permanent magnet pump annular non-metallic refractory sealing pipe 35 is difficult to form, leakage and heat insulation are difficult to solve; the annular non-metallic refractory sealing pipe 35 is usually connected by a number of curved pipe sections through a seal In order to solve this problem, the annular solid non-metallic refractory sealing pipe 35 in the aluminum liquid permanent magnet pump is arranged on the outer wall of the aluminum liquid permanent magnet pump. The solidified layer 34, the sintered solidified layer 34 can be sintered and fixed on the pipeline with a sintering agent and a silicon carbide powder material, so that the respective pipe sections are tightly fastened together by the sintering solidified layer, thereby greatly improving the annular non-metallic fire resistance. The joint strength of the material sealing pipe. The aforementioned sintered solidified layer and sintering technique are all prior art. An irregular mesh stainless steel rib is also disposed in the middle of the sintered solidified layer. The stainless steel rib is fixed on the outer wall of the pipe 35. The material of the sintered solidified layer is covered with stainless steel ribs and sintered into a whole. The stainless steel rib has two functions, one of which can serve to position and support the pipe 35, and the other is to increase the strength of the sintered material.

An insulating layer, such as an asbestos layer, is disposed outside the sintered solidified layer of the pipe 35 to reduce heat loss and ensure that the operating temperature of the permanent magnet is not too high and causes rapid demagnetization. The magnetic circuit of the permanent magnet is complicated in design, and the magnetic field force is very small. The permanent magnet has high requirements on the ambient temperature. Once the temperature exceeds the Curie temperature, the demagnetization phenomenon occurs, and the magnetic field strength is rapidly attenuated, so that the directional flow of the aluminum liquid cannot be achieved. The aluminum liquid permanent magnet pump seals the pipe 35 by using a circular non-metallic refractory material and designs a heat insulating material heat insulating box 33, together with the rational design of the number of the permanent magnets 16 on the halved radial rotor assembly 36. The position makes the magnetic leakage phenomenon in the magnetic circuit decrease, the magnetic field strength is greatly improved, and a large number of magnetic lines of force are concentrated through the annular non-metallic refractory sealing pipe 35, and by adjusting the rotational angular velocity of the permanent magnet, the sealing pipe can be The aluminum liquid is effectively oriented. In the rotor assembly of the present aluminum liquid permanent magnet pump, the permanent magnets 16 are unequally disposed on the rotor assembly, and the permanent magnets 16 may be block-shaped permanent magnets in the axial direction of the rotor assembly 35 from top to bottom or Arranged from bottom to top, set radially from the inside to the outside of the spindle. This structure can achieve better magnetic field strength.

The automatic protection function of the aluminum liquid permanent magnet pump is realized. In operation, the main motor and the transmission device 12 are connected to the rotor assembly 36 through the coupling 14, the bearing 19, and the upper permanent magnet 16 is dragged in the high temperature environment. Under the rotation movement. The high pressure air cooling system 15 blows high pressure airflow through the forced air cooling system inlet 39, flows along the circulating air passage around the rotor assembly 36, and rapidly dissipates heat through the vent holes on the outer support cylinder 37 of the rotor assembly to ensure effective operation of the permanent magnets 16. The temperature environment does not cause the permanent magnet 16 to change downward along the demagnetization curve point, that is, demagnetization. The lifting device 32 on the main frame 31 is controlled by a power distribution system. When the temperature rises abnormally and alarms, the power distribution system controls the lifting device 32 to lift or lower the main motor and the transmission 12, the rotor 36 and the upper permanent magnet 16 along the guide column to protect the main motor and the transmission device 12 and the permanent The magnet 16 is unaffected by the high temperature in the annular non-metallic refractory sealing conduit 35. When the high pressure air cooling system 15 blows the high pressure air stream through the forced air cooling system inlet 39 to bring the temperature back to a normal value, the lifting device 32 restores the main motor and the transmission 12 and the rotor assembly 36 to the working position (as shown in FIG. 12). , aluminum liquid permanent magnet pump continues to work.

Industrial applicability

The aluminum liquid permanent magnet pump can be widely used in the cyclic stirring of the aluminum liquid in the aluminum smelting process, and the inlet and outlet of the annular annular non-metallic refractory sealing pipe 35 and the aluminum pipe and the aluminum inlet of the melting furnace The tubes are connected, and the aluminum liquid in the melting furnace is efficiently circulated by the permanent magnet pump. It is energy-saving and environmentally friendly, and has low cost. It can greatly reduce burning loss, improve product quality, and has broad application prospects.

Claims

Rights request

1. An air-cooled aluminum water permanent magnet pump, comprising: a toroidal silicon carbide sealing pipe, a pump body, a main shaft, a permanent magnet fixing plate, a neodymium iron boron permanent magnet, a main motor and a transmission thereof Device and forced air cooling device;

The sealing pipe is installed in the pump body, and an outer wall of the sealing pipe is provided with a heat insulating layer composed of a heat resistant material, and two ports of the sealing pipe protrude outside the pump body; a permanent magnet fixing plate on which a pure iron yoke is embedded and fixed, the neodymium iron boron permanent magnet is fixed on the fixing plate by the pure iron yoke, and the neodymium iron boron permanent magnet is distributed in the The upper and lower sides of the toroidal silicon carbide sealing pipe or one side thereof or the inner side thereof, the main motor is connected to the main shaft, so that the main motor drives the permanent magnet along the annular silicon carbide sealing pipe a circular motion; the pump body is made of austenitic stainless steel material; the forced air cooling device includes a fan, a circulation air duct disposed in the pump body, and an outlet of the fan is connected to an inlet of the circulation air duct, and the circulating air The outlet of the passage is in communication with the outside of the pump; a temperature sensor is provided in the pump body.

The air-cooled aluminum water permanent magnet pump according to claim 1, wherein: the permanent magnet is composed of a plurality of sets of neodymium iron boron magnetic steel fixed on the permanent magnet fixing plate of the inlaid pure iron yoke. Each set of the permanent magnets has a plurality of magnetic steels distributed on the upper and lower sides or the inner side of the annular silicon carbide sealing pipe.

3. The air-cooled aluminum water permanent magnet pump according to claim 1, wherein: the structure of the pure iron yoke on the fixing plate is a radial bracket structure centered on the main shaft, and the bracket is circumferentially An even-numbered or 4-6 halved structure on which a pure iron yoke is arranged, and a permanent magnet is fixed on the pure iron yoke; the permanent magnets are divided into even arrays or groups of 6-12, and adjacent to the sealed pipe The adjacent two groups of NdFeB permanent magnets have opposite polarities, and their uniform magnetic lines of force are perpendicular to the pipe.

4. The air-cooled aluminum water permanent magnet pump according to claim 1, wherein: the pump body is composed of an inner austenitic stainless steel frame supporting structure and an austenitic stainless steel plate fixedly attached thereto. a box or barrel; a venting window is provided thereon as an outlet of the circulation duct to communicate with the outside of the pump body.

The air-cooled aluminum water permanent magnet pump according to claim 1, wherein: the annular silicon carbide sealing pipe is integrally cast or segmented into a fine silicon carbide powder; or

The annular silicon carbide sealing pipe is a one-way type with two ports as one inlet port and the other as a liquid outlet, or a two-way sealed pipe in which both ports can be used as a liquid inlet or a liquid outlet. Or,

The sealing pipe constitutes an open ring; or

The sealing pipe constitutes an annular spiral pipe, that is, a structure in which a liquid inlet port and a liquid outlet pipe section overlap or partially intersect.

6. The air-cooled aluminum water permanent magnet pump according to claim 5, wherein: The sealing pipe formed by segment casting, wherein the ports of the connecting ends of each segment of the silicon carbide tube have matching stops to facilitate mutual nesting, and a matching gap is left at the socket, wherein the high temperature blocking is provided Leak seal material sealing and bonding; austenitic stainless steel hoop with port peripheral fastening.

The air-cooled aluminum water permanent magnet pump according to claim 5, wherein: a convex rib is formed on an outer wall surface of the connecting end of each of the silicon carbide tubes, and the protruding edge is sleeved a stainless steel hoop to strengthen the connection between each of the segments; or

The sealing pipe is provided with a flange from the inlet port and the liquid outlet of the pump body for connecting with the outside

8. An air-cooled aluminum liquid permanent magnet pump, comprising: a circular sealed non-metallic refractory pipe, a thermal insulation box, a main frame, a lifting device, a rotor assembly, a main motor And its transmission and a forced air cooling system. among them:

The outer wall of the annular sealing non-metallic refractory pipe is provided with a sintering solidified layer to solidify the whole and is placed in a heat insulating box matched with the shape thereof, and the two annular sealing non-metallic refractory pipes are a port extending beyond the thermal insulation box; the rotor assembly includes a main shaft and a yoke fixed to the main shaft, and a permanent magnet on the yoke and a magnetic steel fixing the permanent magnet a main motor and a transmission connected to the main shaft of the rotor assembly to rotate, and the yoke, the magnetic steel cover and the permanent magnet thereon are circular in the center of the annular sealed non-metallic refractory pipe Rotating motion in space; the thermal insulation box is made of austenitic stainless steel material; the lifting device is disposed on the main frame, and the main motor and the rotor assembly connected thereto are provided therein a heat insulating box for a toroidal sealed non-metallic refractory pipe, one of which is disposed on the main frame and the other is disposed on the lifting device to drive the lifting device, A relative displacement is generated between the subassembly and the thermal insulation box such that the rotor assembly enters or exits a circular space in the center of the annular sealed non-metallic refractory conduit; the forced air cooling system includes a fan and is disposed at the The circulation duct around the rotor assembly, the outlet of the fan is connected to the inlet of the circulation duct.

9. The air-cooled aluminum liquid permanent magnet pump according to claim 8, wherein the annular sealed non-metallic refractory pipe is composed of a plurality of curved tubes, and each of the pipe segments is solidified by sintering. Solidified into a whole.

The air-cooled aluminum liquid permanent magnet pump according to claim 8 or 9, wherein the sintered solidified layer is provided with a mesh stainless steel rib.

1 . The air-cooled aluminum liquid permanent magnet pump according to claim 8 , wherein the thermal insulation box is installed at an upper end or a lower end of the main frame, and between the thermal insulation box and the main frame Fasten the connection with bolts.

12. The air-cooled aluminum liquid permanent magnet pump according to claim 8, wherein the heat insulating box is provided with a heat insulating material wrapped around the annular sealed non-metallic refractory pipe. Forms a thermal insulation layer.

The air-cooled aluminum liquid permanent magnet pump according to claim 8, wherein the lifting device comprises an elevator and a guide post, the guide post is fixed on the main frame, and the lifting a lifting platform is arranged on the machine, and the main motor and the rotor assembly connected thereto are fixed on the lifting platform, and a guiding column hole is arranged on the lifting platform, and the guiding column is disposed in the guiding column hole, so that the lifting platform is The elevator drive is driven to move up and down along the guide post, and the elevator is connected to the main frame such that the platform thereon can move up and down with respect to the main frame, so that the main motor and the rotor assembly disposed on the elevator are set A displacement change occurs in the center of the heat insulating box in which the annular sealing non-metallic refractory pipe is built in the main frame.

The air-cooled aluminum liquid permanent magnet pump according to claim 8, wherein the permanent magnets are equally disposed radially in a circumferential direction of the main shaft of the rotor assembly.

The air-cooled aluminum liquid permanent magnet pump according to claim 14, wherein the permanent magnets are block permanent magnets arranged in a shaft axial direction of the rotor assembly from top to bottom or from bottom to top. , set radially from the inside to the outside of the spindle.

16. The air-cooled aluminum liquid permanent magnet pump according to claim 14, wherein the permanent magnets are arranged in four equal parts, or six equal parts, or eight equally divided radially in the circumferential direction of the main shaft of the rotor assembly. .

The air-cooled aluminum liquid permanent magnet pump according to claim 14, wherein the permanent magnets are arranged in four quarters: the yokes are vertically disposed flat plates that are perpendicular to each other in a cross shape. The outer end of the flat yoke is connected to the fixing plate, and the wedge-shaped space between the cross-shaped flat yoke and the fixed plate is filled with a permanent magnet, and the magnetic steel cover is disposed at the outer end of the fixed plate, The magnet is sealed in the wedge-shaped space to form an assembly; a cylinder is added outside the assembly, and a gap between the cylinder and the assembly is filled with a heat insulating material to form a heat insulating protective layer.