Magnetic drive pump with self-heating heat preservation circulation structure

Abstract

The invention discloses a magnetic drive pump with a self-heating heat preservation circulation structure, and particularly relates to the technical field of magnetic drive pumps, which comprises a base, a pump body, a pump cover, a connecting frame, a motor, an impeller, a pump shaft and an isolation sleeve. According to the magnetic drive pump with the spontaneous heating heat preservation circulation structure, the coil is arranged on the protective cover, magnetic induction lines generated by the coil generate heat on the blades made of the magnetic conductive materials, hot air is conveyed to the heat exchange coil pipe in the rotating process of the fan, a heat preservation medium in the heat exchange coil pipe is preliminarily preheated, and the heat preservation efficiency is improved. The preheated heat preservation medium is conveyed into the first heating pipe or the second heating pipe in the isolation sleeve, when the magnetic drive pump works, the isolation sleeve and the first heating pipe or the second heating pipe installed in the isolation sleeve conduct cutting heating on magnetic induction lines, the first heating pipe or the second heating pipe heats the heat preservation medium in the isolation sleeve, and the heat preservation medium in the magnetic drive pump is heated twice. The temperature rising speed of the heat preservation medium is increased, and heat preservation is better conducted on fluid conveyed by the magnetic drive pump.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic pumps, and in particular to a magnetic pump with a self-heating and heat-insulating circulation structure. Background Art

[0002] Magnetic pump, also known as magnetic drive pump, is a new type of seal-less pump that uses the principle of permanent magnetic transmission technology to achieve contactless transmission of torque. There is no mechanical connection between the driving shaft and the driven shaft, and no dynamic seal is required in the structure. Therefore, this type of pump has no seal and can achieve zero leakage. It is particularly suitable for conveying flammable, explosive, volatile, toxic, corrosive and precious liquids. Magnetic pumps are mostly used in situations where the pump is required to have only slight leakage or even no leakage, as well as high vacuum situations where mechanical seals are difficult to cope with. In recent years, this pump has been widely used in foreign countries in the petroleum, chemical, electroplating, pharmaceutical, food, papermaking, printing and dyeing and other industries.

[0003] The magnetic pump conveys easy-to-crystallize media. The easy-to-crystallize media in the casing, pump cover, and internal magnetic rotor are easy to solidify into powder or lumps, which have great resistance and may cause bearing damage or even failure to start. The easy-to-crystallize media in the casing and pump cover are easy to melt, but the easy-to-crystallize media in the internal magnetic rotor cannot melt because the heat source cannot reach this area, making it difficult to shut down and start the machine at any time, increasing the user's cost.

[0004] In order to solve the above problems, we propose a magnetic pump with a self-heating and heat preservation circulation structure. Summary of the invention

[0005] The main purpose of the present invention is to provide a magnetic pump with a self-heating and heat-insulating circulation structure, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A magnetic pump with a self-heating and heat-insulating circulation structure comprises a base, a pump body, a pump cover, a connecting frame, a motor, an impeller, a pump shaft, an inner magnetic rotor, an isolation sleeve and an outer magnetic rotor, the pump body being fixedly mounted on the base, the pump body and the pump cover being sealed and connected by bolts, one end of the pump shaft being fixedly mounted with the inner magnetic rotor, the other end of the pump shaft passing through the pump cover, extending into the pump body and being fixedly connected with the impeller, the outer magnetic rotor being connected to the shaft end of the motor, the isolation sleeve being fixedly mounted on one side of the pump cover by bolts, and the isolation sleeve being located between the inner magnetic rotor and the outer magnetic rotor, the connecting frame being sleeved on the outside of the outer magnetic rotor, and the two ends of the connecting frame being fixedly connected to the pump cover and the motor by bolts respectively, a heat exchange chamber being opened in the isolation sleeve, a first heating tube or a second heating tube being mounted inside the heat exchange chamber, and the first heating tube and the second heating tube being tightly connected to the inner wall of the heat exchange chamber.

[0008] Preferably, a liquid inlet channel and a liquid outlet channel are respectively provided on both sides inside the pump cover, an insulation chamber is provided inside the inner wall of the pump body, a liquid inlet is provided on the top of the insulation chamber, the liquid outlet channel and the liquid inlet are fixedly connected together by a third delivery pipe, a first connecting hole is provided on the side of the liquid inlet channel close to the isolation sleeve, and a second connecting hole is provided on the side of the liquid outlet channel close to the isolation sleeve.

[0009] Preferably, a fan is rotatably installed at the rear end of the inner end cover of the motor, and a protective cover covering the outside of the fan is fixedly installed at the rear end of the inner end cover by bolts, at least one blade in the fan is made of magnetic conductive material, a coil is arranged on the inner wall of the protective cover, a protective cover is arranged on the coil, the protective cover is made of insulating material, a circuit board is installed outside the protective cover, the circuit board provides alternating current for the coil, an air inlet is opened at the front of the inner end cover, an air outlet is opened at the rear end of the protective cover, a heat exchange coil is fixedly installed at the rear end of the air outlet, a second delivery pipe is fixedly installed at the output end of the heat exchange coil, the second delivery pipe is connected to the liquid inlet channel, the circuit board provides high-frequency alternating current for the coil, an alternating magnetic field generated by the high-frequency current passing through the coil, when the blades made of magnetic conductive material on the fan rotate close to the coil, when the blades are within the range of magnetic flux lines of the alternating magnetic field, the magnetic flux lines act on the blades to generate eddy currents inside the blades, thereby heating the blades. The blades heat up, and when the fan delivers airflow, the heated blades can heat the airflow, thereby increasing the temperature of the output airflow. The high-temperature airflow heats the heat exchange coil, and preheats the heat transfer fluid in the heat exchange coil.

[0010] Preferably, a cavity is provided inside the base, a micro water pump is installed in the cavity, a first delivery pipe is fixedly installed at the output end of the micro water pump, an end of the first delivery pipe away from the micro water pump is fixedly connected to the heat exchange coil, a liquid outlet is provided at the bottom of the insulation cavity, a reflux pipe is fixedly installed at the bottom of the liquid outlet, and the bottom of the reflux pipe extends through the cavity.

[0011] Preferably, the first connecting tube and the second connecting tube connected to the heat exchange chamber are fixedly installed on the upper and lower sides of one end of the isolation sleeve close to the pump cover, and the first connecting tube and the second connecting tube are respectively inserted into the first connecting hole and the second connecting hole, and the first connecting tube and the second connecting tube are both provided with sealing gaskets on the outside, and the sealing gaskets are located between the pump cover and the connecting frame.

[0012] Preferably, the first heating tube is folded back and forth in a "bow" shape and surrounds the heat exchange chamber. The two ends of the first heating tube are fixedly connected to the first connecting tube and the second connecting tube respectively. The first heating tube folded back and forth in the "bow" shape can cut the magnetic flux lines multiple times, so that during the rotation process, the frequency of the first heating tube cutting the magnetic flux lines is higher, thereby generating greater heat energy, thereby accelerating the first heating tube to heat the internal insulation medium, accelerating the temperature increase rate of the insulation medium, providing the temperature of the isolation sleeve, and better insulating the fluid transported by the magnetic pump.

[0013] Preferably, the second heating tube is spirally wound in the heat exchange cavity, and two ends of the second heating tube are fixedly connected to the first connecting tube and the second connecting tube respectively.

[0014] Preferably, a plurality of circumferentially distributed heat dissipation ribs are fixedly mounted on the inner wall of the heat exchange chamber, so as to heat the fluid flowing through the heat dissipation ribs over a large area, thereby increasing the heating rate and achieving the effect of heat preservation for the fluid transported by the magnetic pump.

[0015] Preferably, the outer surfaces of the second delivery pipe and the third delivery pipe are wrapped with insulation sleeves, and the second delivery pipe and the third delivery pipe are insulated by the insulation sleeves to prevent heat dissipation from affecting the insulation of the magnetic pump.

[0016] Preferably, the first heating tube and the second heating tube are made of copper, which has good thermal conductivity and can quickly transfer the temperature of the heat-conducting fluid to the isolation sleeve. The isolation sleeve transfers the temperature to the fluid transported by the magnetic pump, thereby keeping the fluid inside the magnetic pump warm and preventing crystallization of the fluid inside the magnetic pump.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention discloses a magnetic pump with a self-heating and heat-insulating circulation structure. A coil is arranged on a protective cover. The magnetic flux lines generated by the coil are used to generate heat on blades made of a magnetic conductive material. The hot air is transported to a heat exchange coil during the rotation of the fan, and the heat-insulating medium inside the heat exchange coil is preliminarily preheated. The preheated heat-insulating medium is transported to a first heating tube or a second heating tube in an isolation sleeve. When the magnetic pump is working, the isolation sleeve and the first heating tube or the second heating tube installed inside, and when the outer magnetic rotor rotates, the first heating tube or the second heating tube cuts the magnetic flux lines. The first heating tube folded back and forth in a "bow" shape and the spiral second heating tube have a high frequency of cutting the magnetic flux lines, so that a higher amount of heat can be generated, thereby accelerating the heating speed of the internal heat-insulating medium by the first heating tube and the second heating tube. At the same time, by heating the heat-insulating medium twice, the temperature increase speed of the heat-insulating medium is further improved, so that the fluid transported by the magnetic pump is better insulated. The present invention enables the heat preservation medium to circulate back and forth in the first conveying pipe, the heat exchange coil, the second conveying pipe, the first heating pipe, the third conveying pipe and the heat preservation chamber, and the heat preservation medium is continuously heated during the flow, thereby maintaining a relatively high temperature during the circulation process, thereby achieving continuous heat preservation of the fluid conveyed in the magnetic pump and avoiding crystallization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a cutaway schematic diagram of the present invention;

[0021] Figure 3 It is a schematic diagram of the connection of the coil, fan, protective cover and heat exchange coil of the present invention;

[0022] Figure 4 It is a schematic diagram of the connection between the isolation sleeve and the first heating pipe of the present invention;

[0023] Figure 5 It is a schematic diagram of the connection between the isolation sleeve and the second heating pipe of the present invention;

[0024] Figure 6 It is a schematic structural diagram of the isolation sleeve of the present invention.

[0025] In the figure: 1, base; 2, pump body; 3, pump cover; 4, connecting frame; 5, motor; 6, impeller; 7, pump shaft; 8, inner magnetic rotor; 9, isolation sleeve; 10, outer magnetic rotor; 11, micro water pump; 12, first delivery pipe; 13, heat exchange coil; 14, second delivery pipe; 15, third delivery pipe; 16, return pipe; 17, first heating pipe; 18, second heating pipe; 101, cavity; 21, insulation cavity; 22, liquid inlet; 23, liquid outlet; 31, liquid inlet channel; 32, first connecting hole; 33, second connecting hole; 34, liquid outlet channel; 51, protective cover; 52, fan; 53, inner end cover; 54, coil; 55, protective cover; 56, air inlet; 57, air outlet; 91, heat exchange cavity; 92, first connecting pipe; 93, second connecting pipe; 94, heat dissipation ribs. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0027] Embodiment 1

[0028] like Figure 1-4 As shown, a magnetic pump with a self-heating and heat-insulating circulation structure includes a base 1, a pump body 2, a pump cover 3, a connecting frame 4, a motor 5, an impeller 6, a pump shaft 7, an inner magnetic rotor 8, an isolation sleeve 9 and an outer magnetic rotor 10. The pump body 2 is fixedly mounted on the base 1, and the pump body 2 and the pump cover 3 are sealed and connected by bolts. The inner magnetic rotor 8 is fixedly mounted on one end of the pump shaft 7, and the other end of the pump shaft 7 passes through the pump cover 3 and extends into the pump body 2 and is fixedly connected to the impeller 6. The outer magnetic rotor 10 is connected to the shaft end of the motor 5, and the isolation sleeve 9 is fixedly mounted on the pump cover by bolts. 3, and the isolation sleeve 9 is located between the inner magnetic rotor 8 and the outer magnetic rotor 10, the connecting frame 4 is sleeved on the outside of the outer magnetic rotor 10, and the two ends of the connecting frame 4 are fixedly connected to the pump cover 3 and the motor 5 by bolts respectively, a heat exchange cavity 91 is opened in the isolation sleeve 9, and a first heating tube 17 is installed inside the heat exchange cavity 91, and a heat transfer fluid medium can be connected to the first heating tube 17. When the motor main shaft drives the outer magnetic rotor 10 to rotate, the first heating tube 17 and the isolation sleeve 9 cut the magnetic flux lines to generate heat, and the first heating tube 17 generates heat to heat the internal heat transfer fluid medium.

[0029] A liquid inlet channel 31 and a liquid outlet channel 34 are respectively provided on both sides of the pump cover 3, an insulation chamber 21 is provided inside the inner wall of the pump body 2, a liquid inlet 22 is provided on the top of the insulation chamber 21, the liquid outlet channel 34 and the liquid inlet 22 are fixedly connected together by a third delivery pipe 15, a first connecting hole 32 is provided on the side of the liquid inlet channel 31 close to the isolation sleeve 9, and a second connecting hole 33 is provided on the side of the liquid outlet channel 34 close to the isolation sleeve 9.

[0030] A fan 52 is rotatably mounted on the rear end of the inner end cover 53 of the motor 5. A protective cover 51 covering the outside of the fan 52 is fixedly mounted on the rear end of the inner end cover 53 by bolts. At least one blade of the fan 52 is made of magnetic conductive material. A coil 54 is arranged on the inner wall of the protective cover 51. A protective cover 55 is arranged on the coil 54. The protective cover 55 is made of insulating material. A circuit board is mounted on the outside of the protective cover 51. The circuit board provides alternating current for the coil 54. An air inlet 56 is provided at the front of the inner end cover 53. An air outlet 57 is provided at the rear end of the protective cover 51. A heat exchange coil 13 is fixedly mounted at the rear end of the air outlet 57. A second delivery pipe 14 is fixedly mounted at the output end of the heat exchange coil 13. The second delivery pipe 14 is connected to the liquid inlet channel 31.

[0031] The motor 5 drives the fan 52 to rotate, so the air is input from the air inlet 56 of the inner end cover 53 and output from the air outlet 57 of the protective cover 51, so as to realize the gas flow. The circuit board provides high-frequency alternating current to the coil 54. The alternating magnetic field generated by the high-frequency current in the coil 54, when the blades made of magnetic conductive material on the fan 52 rotate close to the coil 54, when the blades are within the range of the magnetic flux lines of the alternating magnetic field, the magnetic flux lines act on the blades to generate eddy currents inside the blades, so that the blades heat up. The blades heat up. When the fan 52 conveys the airflow, the heated blades can heat the airflow, so that the temperature of the output airflow increases, and the high-temperature airflow heats the heat exchange coil 13, and preheats the heat transfer fluid in the heat exchange coil 13. Of course, in order to improve the utilization rate of the magnetic flux lines, all the blades of the fan 52 can be made of magnetic conductive materials. During the rotation of the fan 52, all the blades can be heated under the action of the magnetic flux lines, thereby improving the heating efficiency of the airflow. The coil 54 is enclosed by the protective cover 51 and the protective cap 55, both of which are insulators, so the conductive element is enclosed by the insulating sleeve, which is safer.

[0032] A cavity 101 is defined inside the base 1, a micro water pump 11 is installed in the cavity 101, a first delivery pipe 12 is fixedly installed at the output end of the micro water pump 11, an end of the first delivery pipe 12 away from the micro water pump 11 is fixedly connected to the heat exchange coil 13, a liquid outlet 23 is defined at the bottom of the insulation cavity 21, a reflux pipe 16 is fixedly installed at the bottom of the liquid outlet 23, and the bottom of the reflux pipe 16 extends through the cavity 101.

[0033] The first connecting pipe 92 and the second connecting pipe 93 connected to the heat exchange chamber 91 are fixedly installed on the upper and lower sides of one end of the isolation sleeve 9 close to the pump cover 3. The first connecting pipe 92 and the second connecting pipe 93 are respectively inserted into the first connecting hole 32 and the second connecting hole 33. The first connecting pipe 92 and the second connecting pipe 93 are both provided with sealing gaskets on the outside, and the sealing gaskets are located between the pump cover 3 and the connecting frame 4.

[0034] The first heating tube 17 is folded back and forth in a "bow" shape and surrounds the heat exchange chamber 91. The two ends of the first heating tube 17 are fixedly connected to the first connecting tube 92 and the second connecting tube 93 respectively. When the outer magnetic rotor 10 rotates, the first heating tube 17 folded back and forth in a "bow" shape can cut the magnetic flux lines multiple times, so that during the rotation process, the frequency of the first heating tube 17 cutting the magnetic flux lines is higher, thereby generating greater heat energy, thereby accelerating the first heating tube 17 to heat the internal insulation medium, accelerating the temperature increase rate of the insulation medium in the insulation chamber, and better insulating the fluid transported by the magnetic pump.

[0035] The second heating tube 18 is spirally wound in the heat exchange cavity 91 , and two ends of the second heating tube 18 are fixedly connected to the first connecting tube 92 and the second connecting tube 93 , respectively.

[0036] The outer surfaces of the second delivery pipe 14 and the third delivery pipe 15 are wrapped with insulation sleeves, and the second delivery pipe 14 and the third delivery pipe 15 are insulated by the insulation sleeves to prevent heat dissipation when transmitting the heat transfer fluid, thereby affecting the temperature of the heat transfer fluid entering the insulation cavity and affecting the insulation effect of the magnetic pump.

[0037] The first heating tube 17 and the second heating tube 18 are made of copper, which has good thermal conductivity and can quickly transfer the temperature of the heat-conducting fluid to the isolation sleeve 9. The isolation sleeve 9 transfers the temperature to the fluid transported by the magnetic pump to keep the fluid inside the magnetic pump warm and avoid crystallization of the fluid inside the magnetic pump.

[0038] Embodiment 2

[0039] like Figure 5 As shown, compared with the first embodiment, the difference of this embodiment is that a second heating tube 18 is installed in the cavity 101, and the second heating tube 18 is spirally wrapped in the cavity 101. The second heating tube 18 and the isolation sleeve 9 cut the magnetic flux lines to heat the fluid medium entering the pipeline, thereby ensuring that the fluid medium is fully heated, and then the fluid in the magnetic pump is kept warm to ensure the normal operation of the magnetic pump.

[0040] Embodiment 3

[0041] like Figure 6As shown, a plurality of circumferentially distributed heat dissipation ribs 94 are fixedly mounted on the inner wall of the isolation sleeve 9, so as to heat the fluid flowing through the heat dissipation ribs 94 over a large area, thereby increasing the heating rate and achieving the heat preservation of the magnetic pump.

[0042] The working principle of the present invention is as follows: when the magnetic pump is used, the power is first connected and the motor 5 is started to drive its output end to drive the external magnetic rotor 10 to rotate. When the motor 5 is started, the fan 52 is driven to rotate. The micro water pump 11 delivers the heat transfer fluid to the heat exchange coil 13 through the first delivery pipe 12. The circuit board provides high-frequency alternating current to the coil 54. The coil 54 generates an alternating magnetic field after the high-frequency current is passed through it. When the blades made of magnetic conductive material on the fan 52 rotate close to the coil 54, when the blades are within the range of the magnetic flux lines of the alternating magnetic field, the magnetic flux lines act on the blades to generate eddy currents inside the blades, thereby heating the blades. The blades are heated. When the fan 52 delivers airflow, the heated blades can heat the airflow, thereby increasing the temperature of the output airflow. The high-temperature airflow heats the heat exchange coil 13, and preheats the heat transfer fluid in the heat exchange coil 13. The heated heat transfer fluid is delivered to the liquid inlet channel 31 through the second delivery pipe 14, and then delivered to the first heating tube 17 through the second connecting pipe 93. When the outer magnetic rotor 10 rotates, the isolation sleeve 9 and the first heating tube 17 cut the magnetic flux lines, and the first heating tube 17 generates heat to further heat the internal heat transfer fluid, providing the heat transfer fluid. The heating speed effectively achieves the insulation effect by cutting the magnetic flux lines to generate heat. The heated insulation medium transfers the temperature to the isolation sleeve 9, and the isolation sleeve 9 transfers the temperature to the fluid in the magnetic pump to insulate the fluid inside the magnetic pump. The heated insulation medium is transported to the insulation chamber through the third delivery pipe 15. The insulation medium in the insulation chamber insulates the fluid in the magnetic pump. The insulation medium reciprocates and circulates in the first delivery pipe 12, the heat exchange coil 13, the second delivery pipe 14, the first heating pipe 17, the third delivery pipe 15 and the insulation chamber 21 to insulate the transported fluid in the magnetic pump.

[0043] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A magnetic pump with a self-heating and heat-insulating circulation structure, characterized in that: The pump comprises a base (1), a pump body (2), a pump cover (3), a connecting frame (4), a motor (5), an impeller (6), a pump shaft (7), an inner magnetic rotor (8), a spacer sleeve (9) and an outer magnetic rotor (10), wherein the pump body (2) is fixedly mounted on the base (1), the pump body (2) and the pump cover (3) are sealed by bolts, one end of the pump shaft (7) is fixedly mounted with the inner magnetic rotor (8), the other end of the pump shaft (7) passes through the pump cover (3) and extends into the pump body (2) and is fixedly connected to the impeller (6), and the outer magnetic rotor (10) is fixedly mounted on the pump body (2). The pump cover (10) is connected to the shaft end of the motor (5), the isolation sleeve (9) is fixedly installed on one side of the pump cover (3) by bolts, and the isolation sleeve (9) is located between the inner magnetic rotor (8) and the outer magnetic rotor (10), the connecting frame (4) is sleeved on the outside of the outer magnetic rotor (10), and the two ends of the connecting frame (4) are respectively fixedly connected to the pump cover (3) and the motor (5) by bolts, and a heat exchange cavity (91) is opened in the isolation sleeve (9), and a first heating tube (17) or a second heating tube (18) is installed inside the heat exchange cavity (91).

2. A magnetic pump with a self-heating and heat-insulating circulation structure according to claim 1, characterized in that: The pump cover (3) is provided with a liquid inlet channel (31) and a liquid outlet channel (34) on both sides thereof; the pump body (2) is provided with a heat preservation chamber (21) on the inner wall thereof; a liquid inlet (22) is provided on the top of the heat preservation chamber (21); the liquid outlet channel (34) and the liquid inlet (22) are fixedly connected together via a third delivery pipe (15); a first connecting hole (32) is provided on a side of the liquid inlet channel (31) close to the isolation sleeve (9); and a second connecting hole (33) is provided on a side of the liquid outlet channel (34) close to the isolation sleeve (9).

3. A magnetic pump with a self-heating and heat-insulating circulation structure according to claim 2, characterized in that: A fan (52) is rotatably mounted on the rear end of the inner end cover (53) of the motor (5). A protective cover (51) covering the outside of the fan (52) is fixedly mounted on the rear end of the inner end cover (53) by bolts. At least one blade of the fan (52) is made of a magnetic conductive material. A coil (54) is arranged on the inner wall of the protective cover (51). A protective cover (55) is arranged on the coil (54). The protective cover (55) is made of insulating material. A circuit board is mounted on the outside of the protective cover (51). The circuit board provides alternating current for the coil (54). An air inlet (56) is provided at the front of the inner end cover (53). An air outlet (57) is provided at the rear end of the protective cover (51). A heat exchange coil (13) is fixedly mounted at the rear end of the air outlet (57). A second delivery pipe (14) is fixedly mounted at the output end of the heat exchange coil (13). The second delivery pipe (14) is connected to the liquid inlet channel (31).

4. A magnetic pump with a self-heating and heat-insulating circulation structure according to claim 3, characterized in that: The base (1) is provided with a cavity (101) inside, a micro water pump (11) is installed in the cavity (101), a first delivery pipe (12) is fixedly installed at the output end of the micro water pump (11), one end of the first delivery pipe (12) away from the micro water pump (11) is fixedly connected to the heat exchange coil (13), a liquid outlet (23) is provided at the bottom of the heat preservation cavity (21), a return pipe (16) is fixedly installed at the bottom of the liquid outlet (23), and the bottom of the return pipe (16) extends through the cavity (101).

5. A magnetic pump with a self-heating and heat-insulating circulation structure according to claim 4, characterized in that: A first connecting pipe (92) and a second connecting pipe (93) communicating with the heat exchange chamber (91) are fixedly mounted on the upper and lower sides of one end of the isolation sleeve (9) close to the pump cover (3), respectively; the first connecting pipe (92) and the second connecting pipe (93) are respectively inserted into the first connecting hole (32) and the second connecting hole (33); the first connecting pipe (92) and the second connecting pipe (93) are both provided with sealing gaskets on the outside, and the sealing gaskets are located between the pump cover (3) and the connecting frame (4).

6. The magnetic pump with a self-heating and heat-insulating circulation structure according to claim 1, characterized in that: The first heating tube (17) is folded back and forth in a "bow" shape and surrounds the heat exchange cavity (91), and the two ends of the first heating tube (17) are respectively fixedly connected to the first connecting tube (92) and the second connecting tube (93).

7. The magnetic pump with a self-heating and heat-insulating circulation structure according to claim 1, characterized in that: The second heating tube (18) is spirally wound inside the heat exchange cavity (91), and two ends of the second heating tube (18) are respectively fixedly connected to the first connecting tube (92) and the second connecting tube (93).

8. The magnetic pump with a self-heating and heat-insulating circulation structure according to claim 5, characterized in that: A plurality of heat dissipation ribs (94) distributed in a circumference are fixedly mounted on the inner wall of the heat exchange cavity (91).

9. The magnetic pump with a self-heating and heat-insulating circulation structure according to claim 4, characterized in that: The outer surfaces of the second conveying pipe (14) and the third conveying pipe (15) are both wrapped with insulation sleeves.

10. The magnetic pump with a self-heating and heat-insulating circulation structure according to claim 1, characterized in that: The first heating tube (17) and the second heating tube (18) are made of copper.

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