A fully insulated magnetic drive centrifugal pump

Abstract

The present invention proposes a fully insulated magnetic drive centrifugal pump, comprising a pump body, a wear-resistant plate, an impeller, a pump shaft, a partition assembly, an insulated middle body and a magnetic drive assembly. The pump body is provided with a wear-resistant plate, an impeller and a partition assembly. One end of the insulated middle body is connected to the pump body, and the other end is provided with a magnetic drive assembly. The magnetic drive assembly comprises an inner magnetic rotor assembly, an isolation sleeve and an outer magnetic rotor assembly. The inner magnetic rotor assembly is arranged outside the outer magnetic rotor assembly, with an isolation sleeve provided between the two. The pump shaft is installed in the bearing cavity of the insulated middle body, with its two ends respectively connected to the impeller and the inner magnetic rotor assembly, and an axial center hole is provided inside. The outer peripheries of the pump body and the insulated middle body are respectively provided with a first insulation jacket and a second insulation jacket. The overall structure achieves 360-degree wrapping of the insulation jacket without dead angles, achieving a complete insulation effect on the pump flow-through components, improving the insulation efficacy and efficiency, and effectively solving the problems of poor insulation effect and low heat conduction efficiency.

Description

Technical field

[0001] The invention relates to the technical field of thermal insulation magnetic pumps, in particular to a fully thermal insulation magnetic drive centrifugal pump. [Background Technology]

[0002] Magnetic pumps use the suction and repulsive forces generated by the magnetic field to achieve contactless and synchronous transmission of power, converting the leak-prone pump dynamic sealing structure into a zero-leakage static sealing structure, solving the leakage problem. They are widely used in the transportation of various flammable, explosive, toxic, harmful, and precious liquid media.

[0003] Centrifugal pumps are only suitable for the transportation of liquid fluids. For media with high freezing points, they need to be liquefied by heating before they can be transported by the pump. If the insulation preheating is insufficient, the incompletely melted crystals will cause great harm to the normal operation of the pump, which may easily lead to damage to parts or even failure to start the pump. Ordinary centrifugal pumps often fail due to this, and magnetic drive centrifugal pumps will cause the weaker isolation sleeve to rupture.

[0004] The pump body and pump cover of ordinary insulated magnetic pumps are equipped with insulation jackets, which can cope with materials with lower melting points. However, due to their own structural characteristics, they cannot completely insulate the flow-through parts. The inner magnetic rotor and isolation sleeve are far away from the insulation jacket. The materials in this area require a long preheating time, which causes difficulties for on-site use; especially for high-melting-point materials, the crystals cannot be melted, which often causes damage to the pump. [Summary of the invention]

[0005] The purpose of the present invention is to solve the defect in the prior art that the traditional magnetic pump only insulates the pump body and pump cover, and to propose a fully insulated magnetic drive centrifugal pump that can achieve full insulation of the flow-through components, improve the insulation efficiency, and enhance the insulation effect.

[0006] To achieve the above-mentioned purpose, the present invention proposes a fully insulated magnetic drive centrifugal pump, comprising a pump body, a wear-resistant plate, an impeller, a pump shaft, a partition assembly, an insulated middle body and a magnetic drive component. The pump body is provided with a wear-resistant plate, an impeller and a partition assembly. The wear-resistant plate and the partition assembly are respectively installed in the pump front cavity and the pump rear cavity located in front of and behind the impeller. The partition assembly is provided with a through hole for connecting the pump front cavity and the pump rear cavity; one end of the insulated middle body is connected to the pump body, and the other end is provided with a magnetic drive component; the magnetic drive component comprises an inner magnetic rotor assembly, an isolation sleeve, and an outer magnetic rotor assembly. The inner magnetic rotor assembly is arranged on the outside of the outer magnetic rotor assembly, and the two An isolation sleeve is provided between them; the pump shaft is installed in the bearing cavity of the thermal insulation middle body, one end is connected to the impeller, and the other end is connected to the inner magnetic rotor assembly. The pump shaft has an axial hole, and the pump shaft is provided with a secondary circulation hole communicating with the axial hole. One end of the axial hole is communicated with the pump front cavity, and the other end is communicated with the gap between the inner magnetic rotor assembly and the isolation sleeve; an insulation middle body circulation pipe is provided in the insulation middle body, one end of the insulation middle body circulation pipe is communicated with the partition rear cavity of the partition assembly, and the other end is communicated with the gap between the inner magnetic rotor assembly and the isolation sleeve; the peripheries of the pump body and the insulation middle body are respectively provided with a first insulation jacket and a second insulation jacket.

[0007] Preferably, the partition assembly includes a partition and a filter plate, the partition is provided with a through hole, and a partition front cavity and a partition rear cavity are respectively provided on both sides of the partition, the partition front cavity is communicated with the partition rear cavity through the through hole, and a filter plate is provided on the side of the partition facing the partition front cavity, and a side filter screen is provided on the filter plate and is communicated with the partition front cavity.

[0008] Preferably, the partition is further provided with a front friction pair circulation hole, and the back of the impeller blade is provided with a back blade for forming a low-pressure environment on the back of the impeller. The center of the partition is provided with a partition notch, and the impeller is further provided with an impeller rear ring, and the impeller rear ring and the partition notch are clearance-fitted.

[0009] Preferably, two pairs of front and rear secondary circulation holes connected to the axial center hole are opened on the shaft shoulder of the pump shaft, and the secondary circulation holes are connected to the bearing cavity of the heat-insulating middle body.

[0010] Preferably, the inner magnetic rotor assembly includes an inner magnetic rotor support and an inner magnetic rotor, a magnetic steel is installed on the inner side of the inner magnetic rotor, and an auxiliary blade is provided on the side of the inner magnetic rotor support facing away from the inner magnetic rotor, and the auxiliary blade is used for pressurizing the medium in the internal circulation pipe during circulation and heat preservation.

[0011] Preferably, the external magnetic rotor assembly includes an external magnetic rotor and an external magnetic rotor support provided at one end of the external magnetic rotor, and magnetic steel is installed on the outer surface of the external magnetic coupling of the external magnetic rotor.

[0012] Preferably, the outer magnetic rotor support is arranged in a bracket between the heat-insulating middle body and the motor and is transmission-connected to the motor. A protective ring is also installed on the outer magnetic rotor support, and a small gap is provided between the protective ring and the bracket.

[0013] Preferably, an impeller nut is further included, which is installed at the end of the pump shaft to fix the impeller. The outer periphery of the impeller nut is provided with at least one side through hole connected to the axial center hole of the pump shaft.

[0014] Preferably, the inlet and outlet of the first thermal insulation jacket and the second thermal insulation jacket are respectively communicated with the heat medium inlet pipe and the heat medium outlet pipe, the inlet and outlet of the thermal insulation body circulation pipe are connected with the heat medium inlet pipe and the heat medium outlet pipe, the first thermal insulation jacket and the second thermal insulation jacket are respectively connected in parallel with the heat medium inlet pipe through the heat medium inlet branch pipe; the first thermal insulation jacket and the second thermal insulation jacket are respectively connected in parallel with the heat medium outlet pipe through the heat medium outlet branch pipe, the second thermal insulation jacket covers the bearing cavity and the pump rear cavity, and the inlet flange of the pump body is wrapped in the first thermal insulation jacket.

[0015] Preferably, the pump front cavity of the pump body is provided with a pump cavity drain port, which can be used to discharge the residual liquid in the pump front cavity; the pump rear cavity of the pump body is provided with a rear drain plug, which is used to discharge the residual liquid in the pump rear cavity.

[0016] Beneficial effects of the present invention:

[0017] 1. The present invention designs a fully insulated magnetic pump covering the flow-through parts such as the pump body, the insulation middle body, and the isolation sleeve. It adopts a unique structural design, and the inner and outer magnetic drives and the isolation sleeve are installed in reverse. The structure realizes the jacket covering of the inner magnetic drive and the isolation sleeve, so that the overall structure truly achieves 360-degree insulation jacket wrapping without dead angles, realizes the complete insulation effect of the pump flow-through parts, improves the insulation effect and efficiency, and effectively solves the problems of poor insulation effect and low heat conduction efficiency.

[0018] 2. The internal circulation cooling and lubrication system of the thermal insulation magnetic pump is provided with auxiliary boost blades on the inner magnetic rotor seat. The impeller nut is set to a side opening based on the fluid characteristics. The medium of the main circulation loop does not form convection with the pump inlet fluid, which optimizes the efficiency and cavitation margin of the magnetic pump. A cooling and lubrication branch is provided on the pump shaft shoulder to provide sufficient guarantee for the cooling and lubrication of the bearing chamber. The circulating medium is respectively acted upon by the auxiliary blades of the inner magnetic rotor seat and by the impeller back blades through the through holes of the partition assembly to return to the system, thereby enhancing the medium circulation power and effectively improving the circulation effect of special media such as high melting point or high viscosity, thereby avoiding damage to the shaft system of the magnetic pump due to low fluidity and lack of medium lubrication of the circulating cooling medium, achieving higher stability and improving the service life of the thermal insulation magnetic pump equipment.

[0019] 3. The overall structural design of the thermal insulation magnetic pump is ingenious. The partition assembly is specially designed, and it is equipped with an open impeller with a rear ring and a unique back blade structure. In the actual operation of the magnetic pump, when the pump transports materials containing solid impurities, it can cut off the solid impurities from entering the rear chamber of the magnetic pump and the shaft bearing cavity while ensuring the effectiveness of the internal circulation. Therefore, it has almost no effect on the stable operation of the pump, truly realizing the special working condition of the magnetic pump transporting fluids containing solid impurities.

[0020] The features and advantages of the present invention will be described in detail through embodiments with reference to the accompanying drawings.

Brief Description of the Drawings

[0021] Figure 1 This is a schematic diagram of the internal structure of a fully insulated magnetic drive centrifugal pump of the present invention;

[0022] Figure 2 This is a structural diagram of a fully insulated magnetic drive centrifugal pump of the present invention;

[0023] Figure 3 It is a structural schematic diagram of an inner magnetic rotor assembly of a fully insulated magnetic drive centrifugal pump of the present invention;

[0024] Figure 4 It is a structural schematic diagram of an outer magnetic rotor assembly of a fully insulated magnetic drive centrifugal pump of the present invention;

[0025] Figure 5 It is a structural schematic diagram of an impeller of a fully insulated magnetic drive centrifugal pump of the present invention;

[0026] Figure 6 It is a schematic diagram of a diaphragm assembly of a fully insulated magnetic drive centrifugal pump of the present invention. [Specific implementation method]

[0027] See Figures 1 to 6The present invention provides a fully insulated magnetic drive centrifugal pump, comprising a pump body 1, a wear-resistant plate 2, an impeller 3, a pump shaft 4, a partition assembly 6, an insulated middle body 7 and a magnetic drive component. The pump body 1 is provided with a wear-resistant plate 2, an impeller 3 and a partition assembly 6. The wear-resistant plate 2 and the partition assembly 6 are respectively installed in the pump front cavity and the pump rear cavity located in front of and behind the impeller 3. The partition assembly 6 is provided with a through hole 601d for connecting the pump front cavity and the pump rear cavity; one end of the insulated middle body 7 is connected to the pump rear cavity of the pump body 1, and the other end is provided with a magnetic drive component; the magnetic drive component comprises an inner magnetic rotor assembly 11, an isolation sleeve 12, and an outer magnetic rotor assembly 13. The inner magnetic rotor assembly 11 is arranged on the outside of the outer magnetic rotor assembly 13, and an isolation sleeve 12 is provided between the two. The isolation sleeve 12 is installed in the insulated middle body 7. On the middle body 7; the pump shaft 4 is installed in the bearing cavity of the thermal insulation middle body 7, one end is connected to the impeller 3, and the other end is connected to the inner magnetic rotor assembly 11, the pump shaft 4 has an axial hole 401, and the pump shaft 4 is provided with a secondary circulation hole communicating with the axial hole 401, one end of the axial hole 401 is communicated with the pump front cavity, and the other end is communicated with the gap between the inner magnetic rotor assembly 11 and the isolation sleeve 12, for forming a main circulation loop; an thermal insulation middle body internal circulation pipe 701 is provided in the thermal insulation middle body 7, one end of the thermal insulation middle body circulation pipe 701 is communicated with the partition rear cavity 601b of the partition assembly 6, and the other end is communicated with the gap between the inner magnetic rotor assembly 11 and the isolation sleeve 12; the peripheries of the pump body 1 and the thermal insulation middle body 7 are respectively provided with a first thermal insulation jacket and a second thermal insulation jacket.

[0028] Further, see Figure 6The baffle assembly 6 includes a baffle 601 and a filter plate 602. The baffle 601 is provided with a through hole 601d. A baffle front chamber 601a and a baffle rear chamber 601b are respectively provided on either side of the baffle 601. The baffle front chamber 601a communicates with the baffle rear chamber 601b via the through hole 601d. A filter plate 602 is provided on the side of the baffle 601 facing the baffle front chamber 601a. The filter plate 602 is provided with a side filter 602a that communicates with the baffle front chamber 601a. Furthermore, in this embodiment, the baffle 601 is provided with a front friction pair circulation hole 601c for providing a circulation loop for the front friction pair of the thermal insulation magnetic pump. The impeller 3 has back blades 301 on the back of its blades for creating a low-pressure environment on the back of the impeller 3. Among them, the back blade 301, the front friction pair circulation hole 601c, the side filter 602a and the partition notch 601e are a combined design. In this design, the front friction pair circulation hole 601c provides a circulation loop for the front friction pair of the thermal insulation magnetic pump. The back blade 301 uses centrifugal force on the back of the impeller 3 to prevent impurities from accumulating and form a low-pressure environment that promotes circulation, effectively ensuring the circulation of the cooling and lubricating medium and improving the cooling and smoothness stability of the front friction pair of the thermal insulation magnetic pump. The partition 601 has a partition notch 601e at the center, and the impeller 3 is also provided with an impeller rear ring 302. The impeller rear ring 302 is connected to the impeller 3. The partition notch 601e adopts a small gap fit, and solid impurities in the pumping medium are difficult to pass through. The outer diameter of the back blade 301 is slightly lower than the side filter 602a. The side filter 602a can effectively filter the solid impurities in the thermal insulation magnetic pump. When the thermal insulation magnetic pump is running, it continuously flushes the side filter 602a, which greatly reduces the risk of solid impurities in the pumping medium clogging the side filter 602a, thereby isolating the pump cavity of the magnetic pump from the pump rear cavity and the bearing cavity medium. Complex medium is transported in the pump cavity, and the pump circulation loop and the pump rear cavity and bearing cavity are clean medium environments, which provides a guarantee for the long-term stable operation of the magnetic pump.

[0029] Furthermore, two pairs of front and rear secondary circulation holes with smaller apertures connected to the axial center hole 401 are opened on the shoulder of the pump shaft 4, and the secondary circulation holes are connected to the bearing cavity of the thermal insulation middle body 7; the outer sleeve of the pump shaft 4 is provided with a shaft sleeve assembly 10a, 10b, and the pump shaft 4 is installed in the bearing cavity of the thermal insulation middle body 7 through the sliding bearing assembly 9a, 9b and the thrust plate assembly 8a, 8b.

[0030] Further, see Figure 3The inner magnetic rotor assembly 11 includes an inner magnetic rotor support 1101 and an inner magnetic rotor 1102. A magnetic steel is installed on the inner side of the inner magnetic rotor 1102. The inner magnetic rotor support 1101 is provided with an auxiliary blade 11a on the side facing away from the inner magnetic rotor 1102. The auxiliary blade 11a is used to pressurize and circulate the medium in the internal circulation pipe 701 to ensure heat preservation, so that the medium can fully flow through the inner surface of the inner magnetic rotor assembly 11 and the outer surface of the isolation sleeve 12, and take away the eddy current heat generated when the magnetic pump is running.

[0031] Further, see Figure 4 The external magnetic rotor assembly 13 includes an external magnetic rotor 1301 and an external magnetic rotor support 1302 provided at one end of the external magnetic rotor 1301. The outer surface of the external magnetic coupling of the external magnetic rotor 1301 is installed with magnets. Due to the special structural design of the internal magnetic rotor assembly 11, the isolation sleeve 12, and the external magnetic rotor assembly 13 of the reverse magnetic drive component, the size and mass of the external magnetic rotor assembly 13 are greatly reduced, and the drag inertia of the external rotor is reduced, resulting in poor starting stability of the fully insulated magnetic pump. By designing the external magnetic rotor support 1302, the rotational inertia of the external rotor is increased, the transmission efficiency is improved, the amount of expensive magnetic materials is saved, and the starting and operating stability of the fully insulated magnetic pump is improved. Among them, the isolation sleeve 12 is made of non-magnetic material and is reversely installed on the insulation middle body 7 through a special structural design, completely isolating the pumping medium from the outside world in the form of a static seal. The inner magnetic rotor 1102 and the outer magnetic rotor 1301 adopt a special reverse structural design, thereby achieving the design purpose of the magnetic drive component (inner magnetic rotor assembly 11, isolation sleeve 12, outer magnetic rotor assembly 13) of this scheme, so that the second insulation jacket of the insulation middle body 7 completely covers the flow-through components of the magnetic pump, truly achieving 360-degree all-round insulation.

[0032] Furthermore, the outer magnetic rotor support 1302 is disposed within a bracket 16 between the heat-insulating middle body 7 and the motor and is in transmission connection with the motor. Bracket 16, disposed between the heat-insulating middle body 7 and the motor, prevents heat transfer from the jacket to the motor, protecting the motor from overheating. A protective ring 13a is also mounted on the outer magnetic rotor support 1302, with a gap between the protective ring 13a and bracket 16. By designing a small gap between the two, if a prime mover bearing fails, the outer magnetic rotor 1301 will experience radial movement. The protective ring 13a will first collide and rub against the bracket 16, causing the prime mover current to rise sharply and the pump to shut down. This prevents the outer magnetic rotor assembly 13 from abrading the isolation sleeve 12, causing leakage and potentially causing an accident.

[0033] Further, see Figure 1, further comprising an impeller nut 5, which is mounted on the end of the pump shaft 4 and is used to secure the impeller 3. The outer periphery of the impeller nut 5 is provided with at least one side through-hole that communicates with the axial bore 401 of the pump shaft 4. In this embodiment, the impeller nut 5 employs a unique structural design, with no through-holes in the circular end cap and radially arranged side through-holes. This prevents the circulating medium within the axial bore 401 of the pump shaft 4 from convection with the pump inlet fluid, thus preventing it from affecting the inlet flow field. Instead, the medium enters the impeller blades directly under the action of centrifugal force, thereby improving the NPSH and efficiency of the magnetic pump.

[0034] Furthermore, the inlets and outlets of the first thermal insulation jacket and the second thermal insulation jacket are respectively connected to the heat medium inlet pipe 19 and the heat medium outlet pipe 20, and the inlet and outlet of the insulation middle body circulation pipe 701 are connected to the heat medium inlet pipe 19 and the heat medium outlet pipe 20. The first thermal insulation jacket and the second thermal insulation jacket are respectively connected to the heat medium inlet pipe 19 in parallel through the heat medium inlet branch pipe. The heat medium inlet pipe 19 is reasonably arranged as a main pipe. The heat source access only requires connecting to one main pipe, which provides convenience for the user to lay out the pipes and take over the pipes on site. It is located at a lower position on the pump side; the first thermal insulation jacket and the second thermal insulation jacket are respectively connected to the heat medium outlet pipe 20 in parallel through the heat medium outlet branch pipe. The heat medium outlet pipe 20 is reasonably arranged as a main pipe, which provides convenience for the user to lay out the pipes and take over the pipes on site. It is located at a higher position on the pump side. Low inlet and high outlet are conducive to heat exchange, and the insulation is more sufficient and reasonable. The second thermal insulation jacket covers the bearing cavity and the pump rear cavity, and the inlet flange of the pump body 1 is wrapped in the first thermal insulation jacket.

[0035] Further, see Figure 1 and Figure 2 The pump front cavity of the pump body 1 is provided with a pump cavity drain port 101, which is set at the lowest position of the pump front cavity. When the pump stops using, it can be used to discharge the residual liquid in the pump front cavity; the pump rear cavity of the pump body 1 is provided with a rear drain plug 15, which is set at the lowest position of the pump rear cavity. When the pump stops, it can be used to discharge the residual liquid in the pump rear cavity. When used in conjunction with the pump cavity drain port 101, the residual liquid in the pump cavity can be completely drained to avoid the influence of the change in properties of the residual liquid after the insulation is released on the pump, and at the same time provide great convenience for the secondary start-up and daily maintenance of the machine pump. An exhaust interface and a rear drain port are provided on the isolation sleeve flange to facilitate the operation of starting the pump, simplify the work process, and facilitate the discharge of impurities and on-site maintenance and repair.

[0036] Further, see Figure 2The outlet flange of the pump body 1 is also provided with an external interface 21, which is suitable for an external diaphragm sensor. It can monitor the fluid containing solid impurities in real time. Compared with the plug-in interface, it has higher reliability and can also be used as an expansion interface for other purposes, providing guarantee for the stable operation of the pump. This insulated magnetic pump has made a lot of novel designs in many aspects such as exhaust, drainage, and external accessories. The external interface 21 can be used for exhaust and other special equipment interfaces, such as diaphragm sensors; the isolation sleeve is installed upside down and is provided with a rear drain port at the lowest position, which is convenient for users to drain the material residue in the rear chamber of the pump, simplifying the work process of on-site operators; the reasonable layout of the external heat source inlet and outlet pipelines also provides convenience for users.

[0037] Furthermore, the wear-resistant plate 2 is made of wear-resistant and corrosion-resistant materials and is used in conjunction with open blades to improve pump efficiency. Bolt mounting allows for easy replacement after wear, making maintenance simple and quick. O-rings A17 and B18 are also installed on the outside of the wear-resistant plate 2 to form a seal between the wear-resistant plate 2 and the pump body 1. O-ring B18, in conjunction with O-ring A17, seals the wear-resistant plate 2 and the pump body 1, preventing internal leakage and ensuring pump efficiency.

[0038] Further, see Figure 1 , also includes a sensor 14, which is used to monitor changes in the temperature and pressure of the magnetic drive position in the rear cavity of the magnetic pump, thereby ensuring the long-term stable operation of the magnetic pump. After removing the sensor 14, the interface can also be used to purge and flush the pump cavity residue, so that the pump can be cleaned without disassembling the machine, thereby enabling the machine pump to flexibly switch to transport different media without worrying about the mutual influence of different media, providing convenience for users' on-site use.

[0039] Working principle of the present invention:

[0040] Cooling and lubrication circulation structure of the fully insulated magnetic pump: When the fully insulated magnetic pump is operating normally, the medium in the pump cavity forms a high-pressure area in the large outer diameter area under the centrifugal force of the impeller 3, and the medium in the rear cavity of the pump forms a low-pressure area in the auxiliary blade area under the centrifugal action of the auxiliary blade 11a on the inner magnetic rotor support 1101. The high-pressure medium in the pump cavity passes through the partition assembly 6 and transports the fully filtered clean liquid medium to the auxiliary blade 11a of the inner magnetic rotor support 1101 through the insulated intermediate body circulation pipe 701 for re-pressurization. The annular medium accelerates to flow through the inner surface of the inner magnetic rotor assembly 11 and the gap between the isolation sleeve 12, taking away the magnetic eddy current heat generated during the operation of the magnetic pump, and fully cooling the magnetic coupling; the circulating medium continues to return to the low-pressure area of the axial hole 401 of the pump shaft 4, and most of the medium returns to the low-pressure area of the magnetic pump impeller inlet through the axial hole 401. Under the action of the specially structured impeller nut 5, it directly enters the impeller blades, avoiding direct convection with the pump inlet medium, which helps to improve the NPSH and efficiency of the fully insulated magnetic pump.

[0041] A secondary circulation hole with a smaller aperture is provided on the shoulder of the insulation pump shaft. A small part of the circulating medium enters the bearing chamber of the magnetic pump shaft system under the centrifugal force of the pump shaft 4, which effectively cools and lubricates the magnetic pump shaft system wearing parts: sliding bearings, sleeves and thrust plate friction pairs. The rear friction pair is composed of the thrust plate assembly 8b, the sliding bearing assembly 9b and the sleeve assembly 10b. After cooling and lubricating the rear friction pair, the circulating medium enters the low-pressure area formed by the auxiliary blade 11a and returns to the circulation loop. The front friction pair is composed of the thrust plate assembly 8a, the sliding bearing assembly 9a and the sleeve assembly 10a. After the cooling test of the front friction pair, the circulating medium enters the low-pressure area formed by the back blade 301 of the impeller 3 through the front friction pair circulation hole 601c on the partition assembly 6, and enters the pump cavity under the action of the back blade 301.

[0042] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. A fully insulated magnetic drive centrifugal pump, characterized by: The invention comprises a pump body (1), a wear-resistant plate (2), an impeller (3), a pump shaft (4), a partition assembly (6), a heat-insulating middle body (7) and a magnetic drive assembly, wherein the pump body (1) is provided with a wear-resistant plate (2), an impeller (3) and a partition assembly (6), the wear-resistant plate (2) and the partition assembly (6) are respectively installed in the pump front cavity and the pump rear cavity located in front of and behind the impeller (3), and the partition assembly (6) is provided with a through hole (601d) for connecting the pump front cavity and the pump rear cavity; one end of the heat-insulating middle body (7) is connected to the pump body (1), and the other end is provided with a magnetic drive assembly; the magnetic drive assembly comprises an inner magnetic rotor assembly (11), an isolation sleeve (12) and an outer magnetic rotor assembly (13), the inner magnetic rotor assembly (11) is arranged outside the outer magnetic rotor assembly (13), and an isolation sleeve (12) is provided between the two; the pump shaft (4 ) is installed in the bearing cavity of the heat-insulating middle body (7), one end of which is connected to the impeller (3), and the other end of which is connected to the inner magnetic rotor assembly (11); the pump shaft (4) has an axial hole (401), and the pump shaft (4) is provided with a secondary circulation hole communicating with the axial hole (401); one end of the axial hole (401) is communicated with the pump front cavity, and the other end is communicated with the inner magnetic rotor assembly (11) and the gap between the isolation sleeve (12); the heat-insulating middle body (7) is provided with an heat-insulating middle body internal circulation pipe (701), one end of the heat-insulating middle body circulation pipe (701) is communicated with the partition rear cavity (601b) of the partition assembly (6), and the other end is communicated with the gap between the inner magnetic rotor assembly (11) and the isolation sleeve (12); the peripheries of the pump body (1) and the heat-insulating middle body (7) are respectively provided with a first heat-insulating jacket and a second heat-insulating jacket.

2. A fully insulated magnetic drive centrifugal pump according to claim 1, characterized in that: The partition assembly (6) comprises a partition (601) and a filter plate (602); a through hole (601d) is provided on the partition (601); a partition front cavity (601a) and a partition rear cavity (601b) are respectively provided on both sides of the partition (601); the partition front cavity (601a) is communicated with the partition rear cavity (601b) through the through hole (601d); a filter plate (602) is provided on the side of the partition (601) facing the partition front cavity (601a); and a side filter screen (602a) is provided on the filter plate (602) and is communicated with the partition front cavity (601a).

3. A fully insulated magnetic drive centrifugal pump according to claim 2, characterized in that: The partition (601) is also provided with a front friction pair circulation hole (601c), and the back of the blade of the impeller (3) is provided with a back blade (301) for forming a low-pressure environment on the back of the impeller (3). The center of the partition (601) is provided with a partition notch (601e), and the impeller (3) is also provided with an impeller rear ring (302), and the impeller rear ring (302) and the partition notch (601e) are clearance-matched.

4. A fully insulated magnetic drive centrifugal pump according to claim 1, characterized in that: Two pairs of secondary circulation holes, one in front and one in the back, are provided on the shaft shoulder of the pump shaft (4) and are connected to the axial center hole (401). The secondary circulation holes are connected to the bearing cavity of the heat-insulating middle body (7).

5. The fully insulated magnetic drive centrifugal pump according to claim 1, characterized in that: The inner magnetic rotor assembly (11) comprises an inner magnetic rotor support (1101) and an inner magnetic rotor (1102), wherein a magnetic steel is installed on the inner side of the inner magnetic rotor (1102), and an auxiliary blade (11a) is provided on the side of the inner magnetic rotor support (1101) facing away from the inner magnetic rotor (1102), wherein the auxiliary blade (11a) is used for pressurizing the medium in the internal circulation pipe (701) for heat preservation.

6. The fully insulated magnetic drive centrifugal pump according to claim 1, characterized in that: The external magnetic rotor assembly (13) comprises an external magnetic rotor (1301) and an external magnetic rotor support (1302) arranged at one end of the external magnetic rotor (1301), and magnetic steel is installed on the outer surface of the external magnetic coupling of the external magnetic rotor (1301).

7. A fully insulated magnetic drive centrifugal pump according to claim 6, characterized in that: The outer magnetic rotor support (1302) is arranged in a bracket (16) between the heat-insulating middle body (7) and the motor, and is connected to the motor in a transmission manner. A protective ring (13a) is also installed on the outer magnetic rotor support (1302), and a gap is provided between the protective ring (13a) and the bracket (16).

8. The fully insulated magnetic drive centrifugal pump according to claim 1, characterized in that: The invention also includes an impeller nut (5), which is installed at the end of the pump shaft (4) and is used to fix the impeller (3). The outer periphery of the impeller nut (5) is provided with at least one side through hole connected to the axial center hole (401) of the pump shaft (4).

9. The fully insulated magnetic drive centrifugal pump according to claim 1, characterized in that: The inlet and outlet of the first thermal insulation jacket and the second thermal insulation jacket are respectively connected to the heat medium inlet pipe (19) and the heat medium outlet pipe (20); the inlet and outlet of the thermal insulation body circulation pipe (701) are connected to the heat medium inlet pipe (19) and the heat medium outlet pipe (20); the first thermal insulation jacket and the second thermal insulation jacket are respectively connected in parallel to the heat medium inlet pipe (19) through the heat medium inlet branch pipe; the first thermal insulation jacket and the second thermal insulation jacket are respectively connected in parallel to the heat medium outlet pipe (20) through the heat medium outlet branch pipe; the second thermal insulation jacket covers the bearing cavity and the pump rear cavity, and the inlet flange of the pump body (1) is wrapped in the first thermal insulation jacket.

10. The fully insulated magnetic drive centrifugal pump according to claim 1, characterized in that: The pump front cavity of the pump body (1) is provided with a pump cavity drain port (101) for draining residual liquid from the pump front cavity; the pump rear cavity of the pump body (1) is provided with a rear drain plug (15) for draining residual liquid from the pump rear cavity.

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