CN116733754A

CN116733754A - Immersed static seal heat insulation pump and application system and application method thereof

Info

Publication number: CN116733754A
Application number: CN202310320389.7A
Authority: CN
Inventors: 徐月明
Original assignee: Zhejiang Xuezhongtan Environmental Technology Co ltd
Current assignee: Zhejiang Xuezhongtan Environmental Technology Co ltd
Priority date: 2023-03-24
Filing date: 2023-03-24
Publication date: 2023-09-12

Abstract

The invention discloses an immersed static seal heat-insulating pump which comprises a motor, a pump body base, a pump shaft sleeve, a pump body assembly and a magnetic steel set, wherein the pump body base is provided with a pump body; the pump body base comprises an isolation sleeve, a first flange plate, a second flange plate and a pump outlet pipe; the pump shaft sleeve comprises a first fixing part, a first bearing group, a second bearing group, a pump shaft adjusting sleeve and a second fixing part; the pump body assembly comprises a pump body assembly, an impeller, a pump body pressing plate and a pump body fixing rod; the magnetic steel group comprises outer magnetic steel and inner magnetic steel. The device can block the direct contact and heat transfer between the high-low temperature liquid and the pump body base and between the high-low temperature liquid and the internal magnetic steel, and reduce the temperature difference between the surface temperature of the pump body base and the ambient temperature and the temperature resistance grade requirement on the motor and the magnetic steel; the efficiency, the temperature resistance and the tightness are obviously improved, and the service lives of the motor, the magnetic steel and parts around the heat-insulating pump can be prolonged by improving the micro-environment temperature conditions around the motor, the magnetic steel and the heat-insulating pump, so that the safety and reliability problems caused by leakage and temperature rise of the conventional high-low temperature pump are thoroughly solved.

Description

Immersed static seal heat insulation pump and application system and application method thereof

Technical Field

The invention relates to the technical field of high-low temperature constant temperature liquid circulation control, in particular to an immersed static seal heat insulation pump, an application system and an application method thereof.

Background

The high-low temperature constant temperature liquid circulation is widely applied to the fields of aerospace, national defense, military industry, electronic and electric appliances, chemical pharmacy, injection molding and the like, and the research of new energy, new materials and new processes, wherein the highest temperature can reach more than 350 ℃, the lowest temperature can reach below-100 ℃, and common high-low temperature constant temperature liquid circulation equipment comprises a mold temperature machine, an oil temperature machine, a high-low temperature dynamic constant temperature circulation device and the like.

The high-low temperature circulation pump and the liquid heat transfer medium can be realized without separating the high-low temperature circulation pump from the liquid circulation medium, and the common high-low temperature circulation pump comprises a magnetic drive centrifugal pump, a shielding centrifugal pump, a mechanical sealing centrifugal pump and the like. Since the liquid circulation often uses heat transfer oil as a heat transfer medium, the sealing performance of the cryopump becomes the core of quality assurance and safety and reliability.

Among the high-temperature pumps, the magnetic drive pump becomes the first choice, not only because the sealing mode of the magnetic drive pump does not have dynamic sealing of mechanical seal, the highest temperature can meet most application demands up to 350 ℃. However, the eddy current loss generated by the high-speed rotating magnetic pole not only reduces the efficiency of the magnetic pump, but also causes abnormal rise of the medium temperature and demagnetization of the magnetic pole due to heat generation at the limit temperature, thereby influencing the service life of the high-temperature pump. To improve the eddy current loss of a magnetic pump, special shaft coupling and cooling systems are often required to meet the requirements, resulting in a high temperature and constant temperature liquid circulation system that is bulky and unsuitable for experimental or scientific research applications.

The shielding pump is another type of high-temperature pump which does not need a rotating shaft for sealing and has no leakage, and is particularly suitable for the application of chemical processes, such as the transportation of inflammable, explosive and precious liquids and toxic, corrosive and radioactive liquids. The canned motor pump has no antifriction bearing and motor fan, and long-term operation need not lubricating oil and noise is low. However, the barrier pump has strict requirements on viscosity, start-up, stop-and-run conditions of the medium, is power and bulk, even requires additional circulation cooling, and has limited application in high temperature and constant temperature liquid circulation systems where automation and flexibility are extremely demanding.

Patent CN201711243260 discloses an immersed multistage centrifugal pump, which solves the problem that the inside of a container of which the immersed multistage centrifugal pump is installed on site cannot be sealed with the atmosphere, namely, the problem of static seal between a pump head of an immersed magnetic pump and a flange of the container, and the immersed multistage centrifugal pump does not relate to mechanical seal between a pump motor shaft and the pump head or heat insulation requirements between a medium and a motor;

patent CN202010270885 discloses a novel immersed multistage centrifugal pump, which eliminates the hidden trouble that no liquid dry grinding is easy to form after the liquid level is reduced; the pump water outlet section is provided with two seals, a backflow cavity is arranged between the two seals, when the first mechanical seal damages water leakage, liquid can flow back into the box body from the backflow cavity, and the second lip type seal can ensure that the liquid cannot leak to the outside of the box body equipment. Whether the mechanical seal or the lip seal is dynamic seal, the material of the mechanical seal or the lip seal is generally rubber, and the mechanical seal or the lip seal is not oil-proof and heat-proof, so that the requirements of the high-low temperature pump on medium compatibility, sealing and heat insulation cannot be met;

Patent CN202122155739 discloses a novel immersion type vertical multistage centrifugal pump, which reduces the difficulty of installation and later maintenance of mechanical seal through the application of cartridge type mechanical seal, does not get rid of the leakage risk of mechanical seal and blocks the heat transfer channel of thick pump head, and also cannot meet the sealing and heat insulation requirements of high-low temperature pump;

in the traditional prior art, the heat insulation of the high-low temperature pump is realized usually by adjusting the distance between the motor and the pump body or adding additional cooling, but the heat insulation mode can only solve the heat insulation requirement of the motor, and the heat insulation requirement of other parts in huge volume and surrounding environment is difficult to meet the application with limited space.

The magnetic pump can well solve the leakage problem of mechanical seal, but is limited by the vortex booster pump with simple impeller structure, and the characteristics not only limit the improvement of pump flow and efficiency, but also limit the application of the magnetic pump in the low-temperature field due to the heat insulation problem between the pump shell and the motor.

There is a need for a safe and reliable immersion type static seal heat insulating pump with high working efficiency, superior sealing performance and temperature resistance, and an application system and an application method thereof to solve the above technical problems.

Disclosure of Invention

In order to solve the problems, the invention provides an immersed static seal heat insulation pump, an application system and an application method thereof. The immersed static seal heat-insulating pump can reduce the temperature resistance level requirement of the motor and prolong the service life of the motor; the efficiency and the temperature resistance are higher, and the sealing performance, the safety and the reliability of the pump body are improved; the system can thoroughly solve the problems of safety and reliability such as leakage, temperature rise and the like of the system in the prior art. The application of the immersed static seal heat-insulating pump in the totally-enclosed high-low temperature circulation system can improve the energy efficiency of the system, reduce the requirements of the temperature resistance level of the motor and improve the safety and reliability.

In the following description, the words "upper, lower, left, right, inner, outer" and the like are used merely for convenience of description of the orientation, and do not limit the positional relationship and structure thereof to affect the creativity thereof.

The invention solves the technical problems through the following technical scheme:

the invention provides an immersed static seal heat-insulating pump which comprises a motor, a pump body base, a pump shaft sleeve, a pump body assembly and a magnetic steel set, wherein the pump body base is provided with a pump body;

the pump body base comprises an isolation sleeve, a first flange plate, a second flange plate and a pump outlet pipe; the pump shaft sleeve comprises a pump shaft, a first bearing group, a second bearing group, a first fixing part, a second fixing part and a pump shaft adjusting sleeve; the pump body assembly comprises a pump body assembly, at least one impeller, a pump body pressing plate and a plurality of pump body fixing rods; the magnetic steel group comprises inner magnetic steel and outer magnetic steel;

The motor is fixed above the pump body base; the first flange plate is provided with a first through hole and a second through hole, the second flange plate is provided with a fourth through hole and a fifth through hole, and the first flange plate and the second flange plate are arranged in parallel and keep heat insulation distance; the first through hole and the fourth through hole are concentric, and the isolation sleeve penetrates through the first through hole and the fourth through hole and is circumferentially sealed with the first through hole and the fourth through hole; the second through hole and the fifth through hole are concentric, and the pump outlet pipe penetrates through the second through hole and the fifth through hole and is circumferentially sealed with the second through hole and the fifth through hole; the isolating sleeve is an inverted barrel-shaped cylinder with a closed upper end and an open bottom end, the isolating sleeve is divided into an isolating sleeve closing section and an isolating sleeve opening section by taking a first flange plate as a boundary, an inner circulating pipe through hole is formed in the isolating interval at the position, close to the first flange plate, of the isolating sleeve opening section, an L-shaped inner circulating pipe with an opening facing to the second flange plate is arranged on the inner circulating pipe through hole, a first bearing group fixing part is arranged below the inner circulating pipe through hole and on the inner wall of the isolating sleeve opening section, and the outer wall of the first bearing group is matched with the inner wall of the first bearing group fixing part to avoid radial runout of a pump shaft;

The first fixing part is arranged at the upper end of the pump shaft, and the second fixing part is arranged at the lower end of the pump shaft; the first fixing part is connected with the inner magnetic steel and the pump shaft; the second fixing part is connected with the impeller and the pump shaft; the first bearing group is positioned between the first fixing part and the pump shaft adjusting sleeve, the second bearing group is positioned between the pump shaft adjusting sleeve and the second fixing part, and the pump shaft is supported by the first bearing group and the second bearing group from top to bottom;

the pump shell assembly comprises at least a first pump shell and a second pump shell, the second pump shell is positioned above the first pump shell, the impeller is positioned inside the pump shell assembly, the second bearing set is supported on the second pump shell, the pump shell pressing plate is positioned below the first pump shell, and the pump shell assembly is fixed below the second flange plate through the pump body fixing rod;

the outer diameter of the inner magnetic steel is matched with the inner diameter of the sealed section of the isolation sleeve, and a gap is kept; the outer magnetic steel is arranged outside the isolation sleeve sealing section and magnetically coupled with the inner magnetic steel, and the smaller the gap is, the larger the strength of magnetic coupling is, and the larger the driving torque is.

In the application, the first flange plate is a bearing main body of the whole pump body base;

preferably, at least 3 motor support rods which are uniform in circumference and perpendicular to the first flange plate are arranged on the periphery of the isolation sleeve closing section and above the first flange plate, a threaded blind hole is formed in the upper end of each motor support rod and at the end fixed with the motor, and the motor is fixedly connected with the threaded blind hole of each motor support rod through a screw and a heat insulation gasket; through the structure of the motor support rod and the arrangement of the heat insulation gasket, the heat insulation effect is realized to the maximum extent on the basis of meeting the motor installation requirement;

preferably, a plurality of third through holes uniformly distributed on the circumference are arranged on the peripheral plane of the first flange plate, and the third through holes are used for sealing and fixing the immersed static seal heat insulation pump; the periphery of the second flange plate is provided with a plurality of sixth through holes uniformly distributed on the circumference; the sixth through hole is used for fixing the pump shell assembly through the pump shell pressing plate, the pump body fixing rod and the screw.

In the application, the isolating sleeve is a key component of the application, and an effective heat insulation distance is generated through the arrangement of the isolating sleeve.

In the invention, the outer magnetic steel is connected with the rotating shaft of the motor through a screw, and the operation of the magnetic steel group is driven through the rotation of the motor;

in the invention, the pump outlet pipe is used for realizing that the device conveys liquid heat transfer medium outwards;

preferably, the pump outlet pipe is an r-shaped pipe and comprises a first straight pipe, a bending part and a second straight pipe, wherein the first straight pipe, the bending part and the second straight pipe are connected in sequence through pipes, the first straight pipe penetrates through the second through hole and the fifth through hole respectively, and the tail end of the second straight pipe is provided with a sealing part; the axis of the second straight pipe is vertical to the axis of the isolating sleeve sealing section; the motor is fixedly connected with the motor support rod through a screw and a heat insulation gasket; the second flange plate comprises a ring-shaped sealing reinforcing rib with a rectangular cross section, and the ring-shaped sealing reinforcing rib is in sealing fit with the joint part of the pump shell assembly.

In the invention, the pump shaft sleeve is used for realizing the rotation of the impeller;

preferably, the pump shaft comprises a magnetic steel fixing part, a middle part and an impeller fixing part from top to bottom, wherein the magnetic steel fixing part comprises an internal threaded hole, a shaft pin hole and a first bearing group special-shaped cutting surface, the impeller fixing part comprises an impeller special-shaped cutting surface and external threads, and the middle part is connected with the magnetic steel fixing part and the impeller fixing part;

The first bearing group comprises a first stationary ring, a first movable ring and a first thrust ring, and the inner wall of the first stationary ring is in precise sliding fit with the outer wall of the first movable ring; the outer wall of the first stationary ring is precisely fixed and matched with the inner wall of the first bearing set fixing part of the opening section of the isolation sleeve; the inner diameters and the shapes of the first movable ring and the first thrust ring are precisely and fixedly matched with the special-shaped cut surface of the first bearing group of the pump shaft; the end face, contacted with the first thrust ring, of the first static ring freely slides, and the first thrust ring is used for supporting the axial downward thrust of the pump shaft sleeve;

the second bearing group comprises a second thrust ring, a second static ring and a second movable ring, the inner wall of the second static ring is in precise sliding fit with the outer wall of the second movable ring, the outer wall of the second static ring is in precise fixed fit with a static ring fixing cavity of the second pump shell, and the inner diameters of the second movable ring and the second thrust ring are in precise fixed fit with the special-shaped cutting surface of the impeller of the pump shaft; the end face, contacted with the second static ring, of the second thrust ring freely slides, and the second thrust ring is used for supporting the axial upward thrust of the pump shaft sleeve;

the first thrust ring and the second thrust ring are mutually matched, so that axial runout of the pump shaft is avoided, the sliding fit is dynamic and static fit, and the fixed fit is dynamic and dynamic fit or static and static fit.

The pump shaft adjusting sleeve comprises a first bearing group adjusting sleeve and a plurality of second bearing group adjusting sleeves; the first bearing group is sleeved outside the pump shaft in an adjusting mode, and the lower end of the first bearing group abuts against the first bearing group; the second bearing group is sleeved outside the pump shaft in an adjusting mode, and the upper end of the second bearing group is abutted against the second bearing group;

the first fixing part comprises a screw, a first gasket, a shaft pin and a shaft sleeve; the shaft sleeve is a reducing steel pipe and comprises a small diameter and a large diameter, the inner wall of the shaft sleeve is in precise fixed fit with the outer wall of the magnetic steel fixing part, and the outer wall of the small diameter is in precise fixed fit with the inner wall of the inner magnetic steel; the small diameter is provided with 2 through holes, and the shaft pin positions the shaft sleeve to the pump shaft through the through holes; the screw and the first gasket lock the inner magnetic steel, the first movable ring, the first thrust ring and the first bearing set adjusting sleeve on the pump shaft, and the first fixing part realizes the connection and the fixation of the first bearing set, the inner magnetic steel and the pump shaft only through the installation process of one screw;

the second fixing part comprises a guide sleeve, a second gasket and a locking nut, the guide sleeve, the second gasket and the locking nut are matched with external threads of the impeller fixing part to fix the impeller, the second movable ring, the second thrust ring, the second bearing group adjusting sleeve and the pump shaft in a locking mode, and the second fixing part is used for realizing connection and fixation of the second bearing group, the impeller and the pump shaft only through the installation process of one nut.

The large diameter is used for supporting the inner magnetic steel and the first bearing group and ensuring the locking of the inner magnetic steel and the matching state of the first bearing group;

the shaft pin is also used for positioning the position of the inner magnetic steel and preventing the inner magnetic steel from sliding when rotating;

the screw and the first gasket are used for locking the position of the inner magnetic steel on the pump shaft and preventing the inner magnetic steel from moving up and down.

In the present invention, the pump casing assembly is used to combine the first pump casing, the second pump casing (and further includes more pump casings), and the impeller, and to achieve the flow of the medium;

preferably, the first pump shell is disc-shaped and consists of a side wall and a bottom plate, and a pump shell circular flanging through hole is formed in the center of the bottom plate;

the second pump shell comprises a second baffle plate and a plurality of guide strips; all the guide strips are radially and uniformly distributed, and the space formed between the second partition plate and the bottom plate is divided into a plurality of pump shell flow passages; a stationary ring fixing cavity is arranged in the center of the second partition plate, and the outer wall of the second stationary ring is in precise fixed fit with the inner wall of the stationary ring fixing cavity;

the impeller comprises a first blade, a second blade and a plurality of blade guide strips; all the vane guide strips are radially and uniformly distributed, and the space formed between the first vane and the second vane is divided into a plurality of impeller flow channels; the center of the first blade is provided with a blade special-shaped through hole, the shape and the size of the blade special-shaped through hole are precisely and fixedly matched with the impeller special-shaped cutting surface of the impeller fixing part, the center of the second blade is provided with an impeller round flanging through hole, and the diameter and the flanging height of the impeller round flanging through hole are matched with the diameter and the flanging height of the pump shell round flanging through hole;

The diameter and the height of the pump shell component, the diameter of the impeller, the heights of the runner and the impeller runner, and the diameters of the pump shell circular flanging through hole and the impeller circular flanging through hole are matched with the flow and the pressure of the device, so that the efficiency of the device is improved.

More preferably, the pump shell assembly further comprises at least one third pump shell, the third pump shell comprises a third partition board and a plurality of guide strips, all the guide strips are uniformly distributed in a radial manner, and a space formed between the third partition board and the bottom board is divided into a plurality of pump shell flow channels; the center position of the third baffle is provided with a circular boss through hole, and the diameter, the flanging shape and the height of the circular boss through hole are matched with the diameter of the circular flanging through hole of the pump shell.

Preferably, the pump shell pressing plate is a rigid flat plate, a pressing plate circular through hole is arranged in the center of the pressing plate, and the diameter of the pressing plate circular through hole is matched with the diameter of the pump shell circular flanging through hole; the pump body dead lever is the cylinder that both ends are equipped with the internal thread.

According to the invention, the number of the third pump shell and the impellers can be repeatedly arranged in the pump shell assembly according to the requirement of specific working conditions to increase the pump pressure, and correspondingly, the number of the second pump shaft adjusting sleeves and the length of the pump body fixing rod are arranged to adapt to the increment of the number of the pump shell and the impellers.

In the invention, the magnetic steel group is conventional in the art;

preferably, the outer magnetic steel comprises an outer magnetic steel body, an even number of outer magnetic strips, an outer magnetic strip fixing ring and fixing screws; the outer magnetic steel body is a cylinder and comprises a motor shaft fixing part, an outer magnetic strip fixing part and an outer magnetic strip fixing ring positioning part; the motor shaft fixing part is axially provided with a concentric through hole, the inner wall of the concentric through hole is in precise fixed fit with the outer wall of the output shaft of the motor, the motor shaft fixing part is radially provided with a threaded through hole, and the external magnetic steel and the output shaft of the motor are fixed through a fixing screw; the inner edge of the outer magnetic stripe fixing part is uniformly provided with even outer magnetic stripe fixing cavities, the sizes of the outer magnetic stripe fixing cavities are precisely and fixedly matched with the sizes of the outer magnetic stripes, the outer magnetic stripes are rectangular, the polarities of the adjacent outer magnetic stripes in the outer magnetic stripe fixing part are opposite, and the outer magnetic stripes are fixed in the outer magnetic stripe fixing cavities; the inner edge envelope curve of the magnetic stripe formed after the outer magnetic stripe is installed is matched with the outer diameter of the closing section of the isolation sleeve, and a gap is kept; the outer magnetic stripe fixing ring is arranged on the outer magnetic stripe fixing ring positioning part;

the inner magnetic steel comprises an inner magnetic steel body, an even number of inner magnetic strips and inner magnetic strip fixing rings; the inner magnetic steel body is a cylinder and comprises a pump shaft fixing part, an inner magnetic strip fixing cavity and an inner magnetic strip fixing ring sealing part, wherein the inner magnetic strip fixing cavity and the inner magnetic strip fixing ring sealing part are uniformly distributed on the circumference of the pump shaft fixing part, a through hole is axially formed in the pump shaft fixing part, and the inner wall of the through hole is in precise fit with the small-diameter outer wall of the shaft sleeve; two keyways which are identical in height with the inner magnetic steel body and distributed in a 180-degree mirror image mode are arranged on the through hole, and the width of each keyway and the inner clear distance between the two keyways are identical with the diameter and the length of the shaft pin; the size of the inner magnetic stripe fixing cavity is fixedly matched with the size of the inner magnetic stripe; the inner magnetic strips are rectangular bodies, the polarities of adjacent inner magnetic strips in the inner magnetic strip fixing cavity are opposite, and the inner magnetic strips are sealed in the inner magnetic steel body through the inner magnetic strip fixing ring sealing part; the number of the inner magnetic stripes is equal to that of the outer magnetic stripes.

The invention also provides application of the immersed static seal heat-insulating pump, which is applied to a totally-enclosed high-low temperature circulation system, wherein the totally-enclosed high-low temperature circulation system comprises the immersed static seal heat-insulating pump, a bath container, an expansion container connecting pipe, a heat-conducting medium, a circulation inlet pipe and an outer circulation pipe; the first flange of the immersed static seal heat-insulating pump and the flange of the bath container are fixed in a sealing way through screws and sealing rings; the expansion vessel connecting pipe is used for communicating the bath vessel with a sealing pipeline of the expansion vessel, and the heat conducting medium is positioned in the expansion vessel; the outer circulation pipe is used for connecting an external application system and the pump outlet pipe and the circulation inlet pipe.

The invention also provides a heat insulation circulation method of the totally-enclosed high-low temperature circulation system, which comprises the following steps:

s1, injecting a heat-conducting medium from an expansion container, enabling the heat-conducting medium to enter a bath container from an expansion container connecting pipe by means of gravity, and exhausting air from a pump outlet pipe or a circulating inlet pipe, wherein the air positioned in a closing section of the isolation sleeve and the air positioned between the first flange plate and the second flange plate and outside an opening section of the isolation sleeve are retained and cannot be completely exhausted;

S2, connecting an external application system, a pump outlet pipe and a circulating inlet pipe by using the outer circulating pipe, and maintaining the tightness of a totally-enclosed high-low temperature circulating system;

s3, starting medium circulation of the totally-enclosed high-low temperature circulation system, wherein the medium circulation comprises an external circulation flow and an internal circulation flow, the flow and the pressure of the totally-enclosed high-low temperature circulation system are realized through the external circulation flow, and the lubrication of the first bearing group is realized through the internal circulation flow; the residual air in the sealed section of the isolating sleeve is further compressed under the combined action of the pump pressure and the medium steam pressure in the sealed system, the liquid medium is sucked or discharged under the combined action of the atmospheric pressure and the medium steam pressure in the sealed system, and the air between the first flange plate and the second flange plate and outside the opening section of the isolating sleeve is compressed or expanded under the combined action of the atmospheric pressure and the medium steam pressure in the sealed system;

s4, starting temperature control of the totally-enclosed high-low temperature circulation system, wherein in the heating process, the heat-conducting medium expands, the expanded heat-conducting medium enters the expansion container depending on the pressure of the totally-enclosed system, and in the cooling process, the heat-conducting medium contracts, and the heat-conducting medium in the expansion container enters the bath container depending on gravity; the internal circulation flow is reduced, the medium flow in the sealing section of the isolation sleeve is blocked, the heat insulation distance between the first flange plate and the second flange plate is increased, and the heat insulation between the high-low temperature liquid medium and the first flange plate and the heat insulation circulation of the motor and the heat insulation circulation of the totally-enclosed high-low temperature circulation system are improved.

In the present invention, the flow rate of the inner circulation stream of the medium circulation is less than 1% of the outer circulation stream.

The immersed static seal heat-insulating pump of the invention is not only applied to high-temperature heat insulation, but also applied to low-temperature heat insulation.

The invention has the advantages and beneficial effects that:

1. the unique heat insulation and sealing structure design limits the air removal in the sealing section of the isolation sleeve and the heat insulation space between the first flange plate and the second flange plate and outside the opening section of the isolation sleeve, the medium circulation is only carried out in the external circulation flow and can not enter the sealing section of the isolation sleeve of the pump body base, and the medium which is used for bearing lubrication and enters the opening section of the isolation sleeve in the internal circulation flow is less than 1% of the whole external circulation flow, so that the direct contact and heat transfer between a high-low temperature medium and the pump body base are greatly reduced, the heat exchange among the first flange plate, the motor, the internal magnetic steel and the heat conducting medium is blocked, the energy loss and the temperature resistance grade requirements on the motor and the internal magnetic steel are reduced, and the service lives of the motor, the internal magnetic steel and parts around the heat insulation pump can be prolonged;

2. the medium steam and pressure in the isolating sleeve sealing section limit the direct contact between the rotating magnetic pole and the conveying medium, even if a small amount of contact exists, the medium in the top space can not participate in the circulation of the inner circulation flow and the outer circulation flow, and the eddy heating can not influence the temperature control of the totally-enclosed high-low temperature constant temperature circulation system;

3. Compared with the traditional magnetic force driven high-temperature centrifugal pump and the vortex type booster pump, the immersed static seal heat insulation pump has higher efficiency and temperature resistance; compared with the traditional mechanical seal multistage booster pump, except for the static flange seal of the pump body base, the immersed static seal heat-insulating pump has no dynamic mechanical seal and other dynamic seals in any form, so that the sealing performance, safety and reliability of the pump body are greatly improved;

4. the totally-enclosed high-low temperature constant temperature circulating system using the immersed static seal heat-insulating pump has less heat leakage and good sealing property, and can thoroughly solve the problems of safety and reliability such as leakage, temperature rise and the like of the circulating system in the prior art;

5. the heat-insulating circulation method of the immersed static seal heat-insulating pump can improve the energy efficiency of the system, reduce the requirements of temperature resistance levels of the motor and the inner magnetic steel, and improve the safety and the reliability.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic structural view of an immersed static seal heat-insulating pump according to an embodiment;

FIG. 2 is a schematic illustration of a multistage pump configuration of a third pump housing and a third impeller of an immersed static seal heat-insulating pump arrangement of an embodiment;

FIG. 3 is a schematic structural view of a pump shaft kit of an immersed static seal heat-insulating pump according to an embodiment;

FIG. 4 is a schematic view of the structure of the first and second bearing sets of the immersed static seal heat-insulating pump of the embodiment;

FIG. 5 is a schematic structural view of a pump shaft of an immersed static seal heat-insulating pump according to an embodiment;

FIG. 6 is a schematic structural view of a sleeve of an immersed static seal heat-insulating pump according to an embodiment;

FIG. 7 is a schematic cross-sectional view of an outer magnetic steel of an immersed static seal heat-insulating pump according to an embodiment;

FIG. 8 is a schematic top view of an outer magnetic steel of an immersed static seal heat-insulating pump according to an embodiment;

FIG. 9 is a schematic cross-sectional view of an inner magnetic steel of an immersed static seal heat-insulating pump according to an embodiment;

FIG. 10 is a schematic top view of an inner magnetic steel of an immersed static seal heat-insulating pump according to an embodiment;

FIG. 11 is a bottom view of an embodiment of an immersed static seal heat-insulating pump;

FIG. 12 is a bottom view of an embodiment of an immersed static seal heat-insulating pump;

FIG. 13 is a schematic cross-sectional view of a second pump housing of an embodiment of an immersed static seal heat-insulating pump;

FIG. 14 is a schematic top view of a second pump housing of an embodiment of an immersed static seal heat-insulating pump;

FIG. 15 is a schematic cross-sectional view of an impeller of an immersed static seal heat-insulating pump of an embodiment;

FIG. 16 is a schematic top view of an impeller of an embodiment of an immersed static seal heat-insulating pump;

FIG. 17 is a schematic cross-sectional view of a third pump casing of an immersed static-sealed heat-insulating pump of an embodiment;

FIG. 18 is a schematic top view of a third pump housing of an embodiment of an immersed static seal heat-insulating pump;

FIG. 19 is a schematic cross-sectional view of a pump body base of an immersed static-sealed heat-insulating pump of an embodiment;

fig. 20 is a schematic structural diagram of a totally enclosed high-low temperature circulation system according to an embodiment.

Reference numerals illustrate:

1. a motor; 2. A pump body base;

3. a pump shaft sleeve; 4. A pump body assembly;

5. a magnetic steel group; 21. The isolation sleeve seals the section;

22. an opening section of the isolation sleeve; 23. A motor support rod;

24. a first flange; 25. A second flange;

26. a pump outlet tube; 27. An internal circulation pipeline;

31. a first fixing portion; 32. A first bearing set;

33. a second bearing group; 34. A pump shaft;

35. a pump shaft adjusting sleeve; 36. A second fixing portion;

41. a pump housing assembly; 42. An impeller;

43. a pump housing pressure plate; 44. A pump body fixing rod;

51. An outer magnetic steel; 52. An inner magnetic steel;

61. an external recycle stream; 62. An internal recycle stream;

241. a first through hole; 242. A second through hole;

243. a third through hole; 251. A fourth through hole;

252. a fifth through hole; 253. A sixth through hole;

221. a first bearing set fixing portion; 222. An inner circulation pipe;

261. a first straight tube; 262. A bending portion;

263. a second straight tube; 264. A sealing part;

254. a ring-shaped sealing reinforcing rib; 311. A screw;

312. a first gasket; 313. A shaft pin;

314. a shaft sleeve; 3141. A small diameter;

3142. a through hole; 3143. A large diameter;

361. guide sleeve; 362. A second gasket;

363. a lock nut; 321. A first stationary ring;

322. a first moving ring; 323. A first thrust collar;

331. a second thrust collar; 332. A second stationary ring;

333. a second moving ring;

341. a magnetic steel fixing part; 342. An impeller fixing part;

343. an intermediate portion; 3411. An internal threaded hole;

3412. a shaft pin hole; 3413. A first bearing set opposite cut surface;

342. an impeller fixing part; 3421. Impeller anisotropic sliced noodles;

3422. an external thread; 351. A first bearing set adjustment sleeve;

352. a second bearing set adjusting sleeve;

411. a first pump housing; 412. A second pump housing;

4111. A bottom plate; 4112. A sidewall;

4113. a round flanging through hole of the pump shell; 4121. A second separator;

4122. a flow guiding strip; 4123. A pump housing flow passage;

4124. a stationary ring fixing cavity; 421. A first blade;

422. a second blade; 423. Vane guide strips;

424. an impeller runner; 4211. A special-shaped through hole;

413. a third pump housing; 4131. A third separator;

4132. a circular boss through hole; 431. a circular through hole;

511. an outer magnetic steel body; 512. An outer magnetic stripe;

513. an outer magnetic stripe fixing ring; 514. A set screw;

5111. a motor fixing part; 5112. An outer magnetic stripe fixing part;

5113. an outer magnetic stripe fixing ring positioning part; 521. An inner magnetic steel body;

522. an inner magnetic stripe; 523. An inner magnetic stripe fixing ring;

5211. a pump shaft fixing portion; 5212. An inner magnetic stripe fixing cavity;

5213. sealing part of inner magnetic stripe fixing ring; 5214. A key slot;

4221. circular flanging through holes of the impeller; 71. A heat insulating pump;

72. a bath container; 73. An expansion vessel;

74. an expansion vessel connection tube; 75. A heat-conducting medium;

76. a circulation inlet pipe; 77. an outer circulation pipe.

Detailed Description

The following describes the embodiments of the present invention further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.

As shown in fig. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 and 19, the present embodiment provides an immersed static seal heat-insulating pump,

the pump comprises a motor 1, a pump body base 2, a pump shaft sleeve 3, a pump body assembly 4 and a magnetic steel group 5;

the pump body base 2 comprises an isolation sleeve, a first flange 24, a second flange 25 and a pump outlet pipe 26; the pump shaft sleeve 3 comprises a pump shaft 34, a first bearing group 32, a second bearing group 33, a first fixing part 31, a second fixing part 36 and a pump shaft adjusting sleeve 35; the pump body assembly 4 comprises a pump body assembly 41, at least one impeller 42, a pump body platen 43 and a number of pump body fixing bars 44; the magnetic steel group 5 comprises an inner magnetic steel 52 and an outer magnetic steel 51;

the motor 1 is fixed above the pump body base 2; the first flange plate 24 is provided with a first through hole 241 and a second through hole 242, the second flange plate 25 is provided with a fourth through hole 251 and a fifth through hole 252, and the first flange plate 24 and the second flange plate 25 are arranged in parallel and keep heat insulation intervals; the first through hole 241 and the fourth through hole 251 are concentric, and the spacer penetrates the first through hole 241 and the fourth through hole 251 and is circumferentially sealed with the first through hole 241 and the fourth through hole 251; the second through-hole 242 and the fifth through-hole 252 are concentric, and the pump outlet tube 26 penetrates the second through-hole 242 and the fifth through-hole 252 and is circumferentially sealed with the second through-hole 242 and the fifth through-hole 252; the isolation sleeve is an inverted barrel-shaped cylinder with a closed upper end and an open bottom end, and is divided into an isolation sleeve closing section 21 and an isolation sleeve opening section 22 by taking a first flange plate 24 as a boundary, an inner circulation pipe through hole is formed in the isolation sleeve opening section, which is close to the first flange plate, an L-shaped inner circulation pipe 222 with an opening facing the second flange plate is arranged on the inner circulation pipe through hole, a first bearing set fixing part 221 is arranged below the inner circulation pipe through hole and on the inner wall of the isolation sleeve opening section 22, and the outer wall of the first bearing set 32 is matched with the inner wall of the first bearing set fixing part 221 so as to avoid radial runout of the pump shaft;

The first fixing part 31 is arranged at the upper end of the pump shaft 34, and the second fixing part 36 is arranged at the lower end of the pump shaft 34; the first fixing part 31 is connected with the inner magnetic steel 52 and the pump shaft 34; the second fixing portion 36 connects the impeller 42 and the pump shaft 34; the first bearing set 32 is located between the first fixing portion 31 and the pump shaft adjusting sleeve 35, the second bearing set 33 is located between the pump shaft adjusting sleeve 35 and the second fixing portion 36, and the pump shaft 34 is supported by the first bearing set 32 and the second bearing set 33 from top to bottom;

the pump casing assembly 41 comprises at least a first pump casing 411 and a second pump casing 412, the second pump casing 412 is positioned above the first pump casing 411, the impeller 42 is positioned inside the pump casing assembly 41, the second bearing group 33 is supported on the second pump casing 412, the pump casing pressing plate 43 is positioned below the first pump casing 411, and the pump casing assembly 41 is fixed below the second flange plate 25 through the pump body fixing rod 44;

the outer diameter of the inner magnetic steel 52 is matched with the inner diameter of the isolating sleeve closing section 21, and a gap is kept; the outer magnetic steel 51 is disposed outside the spacer sleeve closing section 21 and magnetically coupled with the inner magnetic steel 52, and the smaller the gap is, the greater the strength of the magnetic coupling and the greater the driving torque.

In this embodiment, the first flange 24 is a bearing body of the pump body base 2; at least 3 motor support rods 23 which are uniform in circumference and perpendicular to the first flange plate 24 are arranged on the periphery of the isolation sleeve closing section 21 and above the first flange plate 24, and threaded blind holes are formed in the upper end of the motor support rods 23 and the end fixed with the motor 1; the motor 1 is fixedly connected with the threaded blind hole of the motor supporting rod 23 through a screw and a heat insulation gasket, and the heat insulation effect is maximally realized on the basis of realizing the installation requirement of the motor 1 through the structure of the motor supporting rod 23 and the arrangement of the heat insulation gasket;

A plurality of third through holes 243 uniformly distributed on the circumference are arranged on the peripheral plane of the first flange 24, and the third through holes 243 are used for realizing the sealing and fixing of the heat insulation pump; the periphery of the second flange plate 25 is provided with a plurality of sixth through holes 253 uniformly distributed on the circumference; the sixth through hole 253 is used to fix the pump housing assembly 41 by the pump housing pressing plate 43, the pump housing fixing rod 44, and screws.

In this embodiment, the spacer is a key component of the present application, and an effective insulation distance is generated by the arrangement of the spacer.

In this embodiment, the outer magnetic steel 51 is connected to the rotating shaft of the motor 1 through a screw, and the motor 1 rotates to drive the magnetic steel set 5 to operate.

In this embodiment, the pump outlet tube 26 is used to effect the delivery of liquid heat transfer medium to the outside of the device;

the pump outlet pipe 26 is an r-shaped pipe and comprises a first straight pipe 261, a bending part 262 and a second straight pipe 263, the first straight pipe 261, the bending part 262 and the second straight pipe 263 are connected in sequence in a pipe way, the first straight pipe 261 respectively penetrates through the second through hole 242 and the fifth through hole 252, and the tail end of the second straight pipe 263 is provided with a sealing part 264; the axis of the second straight tube 263 is perpendicular to the axis of the isolating sleeve sealing section 21; the second flange 25 includes a generally rectangular cross-sectional annular seal bead 254. The annular seal bead 254 sealingly engages the juncture of the pump housing assembly 41.

In this embodiment, the pump shaft assembly 3 is used to implement rotation of the impeller 42;

the pump shaft 34 comprises a magnetic steel fixing part 341, a middle part 343 and an impeller fixing part 342 from top to bottom, wherein the magnetic steel fixing part 341 comprises an internal threaded hole 3411, a shaft pin hole 3412 and a first bearing group special-shaped cutting surface 3413, the impeller fixing part 342 comprises an impeller special-shaped cutting surface 3421 and an external thread 3422, and the middle part 343 is connected with the magnetic steel fixing part 341 and the impeller fixing part 342;

the first bearing group 32 comprises a first stationary ring 321, a first movable ring 322 and a first thrust ring 323, wherein the inner wall of the first stationary ring 321 is in precise sliding fit with the outer wall of the first movable ring 322; the outer wall of the first stationary ring 321 is precisely fixedly matched with the inner wall of the first bearing set fixing part 221 of the spacer sleeve opening section 22; the inner diameters and the shapes of the first movable ring 322 and the first thrust ring 323 are precisely and fixedly matched with the first bearing group special-shaped cut surface 3413 of the pump shaft 34; the end surface of the first static ring 321, which is contacted with the first thrust ring 323, freely slides, and the first thrust ring 323 is used for supporting the axial downward thrust of the pump shaft sleeve 3;

the second bearing set 33 comprises a second thrust ring 331, a second static ring 332 and a second moving ring 333, wherein the inner wall of the second static ring 332 is in precise sliding fit with the outer wall of the second moving ring 333, the outer wall of the second static ring 332 is in precise fixed fit with a static ring fixing cavity 4124 of the second pump shell 412, and the inner diameters and shapes of the second moving ring 333 and the second thrust ring 331 are in precise fixed fit with an impeller special-shaped cut surface 3421 of the pump shaft 34; the end surface of the second static ring 332, which is in contact with the second thrust ring 331, slides freely, and the second thrust ring 331 is used for supporting the axial upward thrust of the pump shaft sleeve 3;

The first thrust ring 323 and the second thrust ring 331 cooperate with each other to avoid axial runout of the pump shaft 34, and the sliding fit is a dynamic-to-static fit, and the fixed fit is a dynamic-to-dynamic fit or a static-to-static fit.

The first bearing set 32 and the second bearing set 33 may be replaced with other plain or rolling bearings of equivalent function, provided that the cooperation therebetween supports the pump shaft and its supported impeller 42 and inner magnet steel 52.

The pump shaft adjusting sleeve 35 comprises a first bearing group adjusting sleeve 351 and a plurality of second bearing group adjusting sleeves 352; the first bearing set adjusting sleeve 351 is arranged outside the pump shaft 34 and abuts against the first bearing 32 set at the lower end; the second bearing set adjusting sleeve 352 is arranged outside the pump shaft and abuts against the second bearing set 33 at the upper end, and the pump shaft adjusting sleeve 352 is used for adapting the number of the third pump shell 413 and the impellers 42 so as to raise the pressure of the heat insulation pump;

the first fixing portion 31 includes a screw 311, a first washer 312, a shaft pin 313 and a shaft sleeve 314; the shaft sleeve 314 is a reducing steel tube and comprises a small diameter 3141 and a large diameter 3143, the inner wall of the shaft sleeve 314 is precisely fixed and matched with the outer wall of the magnetic steel fixing part 341, and the outer wall of the small diameter 3141 is precisely fixed and matched with the inner wall of the inner magnetic steel 52; the small diameter 3141 is provided with 2 through holes 3143, and the shaft pin 313 positions the shaft sleeve 314 to the pump shaft 34 through the through holes 3143; the screw 311 and the first gasket 312 lock the inner magnetic steel 52, the first movable ring 322, the first thrust ring 323 and the first bearing set adjusting sleeve 351 on the pump shaft 34; the first fixing part 31 realizes the connection and the fixation of the first bearing group 32, the inner magnetic steel 52 and the pump shaft 34 only through the installation process of one screw;

The second fixing portion 36 includes a guide sleeve 361, a second spacer 362, and a lock nut 363, where the guide sleeve 361, the second spacer 362, and the lock nut 363 cooperate with external threads 3422 of the impeller fixing portion 342 to lock and fix the impeller 42, the second moving ring 333, the second thrust ring 331, the second bearing set adjustment sleeve 352, and the pump shaft 34; the second fixing portion 36 enables the connection and fixation of the second bearing set 33, the impeller 42 and the pump shaft 34 by only one nut installation process.

The large diameter 3142 is used for supporting the inner magnetic steel 52 and the first bearing set 32 and ensuring the locking of the inner magnetic steel 52 and the matching state of the first bearing set 32;

the shaft pin 313 is also used for positioning the inner magnetic steel 52 and preventing sliding when rotating;

the screw 311 and the first spacer 312 are used to lock the position of the inner magnet steel 52 on the pump shaft 34 and prevent it from moving up and down.

In the present embodiment, the pump casing assembly 41 is used to combine the pump casing 41 and the impeller 42 and achieve the flow of the medium;

the first pump casing 411 is disc-shaped and consists of a bottom plate 4111 and a side wall 4112, wherein a pump casing circular flanging through hole 4113 is formed in the center of the bottom plate 4111;

the second pump housing 412 includes a second baffle 4121 and a plurality of baffle strips 4122; all the flow guide strips 4122 are radially and uniformly distributed, and divide the space formed between the second baffle 4121 and the bottom plate 4111 into a plurality of pump shell flow channels 4123; the center of the second separator 4121 is provided with a static ring fixing cavity 4124, and the outer wall of the second static ring 332 is precisely and fixedly matched with the inner wall of the static ring fixing cavity 4124;

The impeller 42 comprises a first blade 421, a second blade 422 and a plurality of blade guide strips 423; all the vane guide strips 423 are radially and uniformly distributed and divide the space formed between the first vane 421 and the second vane 422 into a plurality of impeller flow channels 424; the center of the first blade 421 is provided with a blade special-shaped through hole 4211, the shape and the size of the blade special-shaped through hole are precisely and fixedly matched with the impeller special-shaped chamfered surface 3421 of the impeller fixing part 342, the center of the second blade 422 is provided with an impeller round-flanging through hole 4221, and the diameter and the flanging height of the impeller round-flanging through hole 4221 are matched with the diameter and the flanging height of the pump case round-flanging through hole 4113;

the diameter and height of the pump housing assembly 41, the diameter of the impeller 42, the height of the flow channels 4123 and 424, and the diameters of the pump housing circular flange through hole 4113 and 4221 are matched to the flow rate and pressure of the device for improving the device efficiency.

The pump casing assembly can be adjusted according to the requirements of actual working conditions, so that the device is in a multi-pump casing and multi-impeller form, generally, the pump casing assembly 41 further comprises at least one third pump casing 413, the third pump casing 413 comprises a third partition 4131 and a plurality of flow guide strips 4122, all the flow guide strips 4122 are uniformly distributed in a radial manner, and a space formed between the third partition 4131 and a bottom plate 4111 is divided into a plurality of pump casing flow channels 4123; the center of the third baffle 4131 is provided with a circular boss through hole 4132, and the diameter, the flanging shape and the height of the circular boss through hole 4132 are matched with the diameter of the circular flanging through hole 4113 of the pump case; wherein when a greater pump pressure is desired, the third pump casing 413 and impeller 42 may be repeatedly increased, and correspondingly, the number of second pump shaft adjustment sleeves 352 and the length of the pump body fixing rod 44 may be required to accommodate the increasing number of third pump casings 413 and impellers 42.

The pump casing pressure plate 43 is a rigid flat plate, a pressure plate circular through hole 431 is arranged at the center of the pressure plate circular through hole 431, and the diameter of the pressure plate circular through hole 431 is matched with the diameter of a pump casing circular flanging through hole 4113 of the first pump casing 411; the pump body fixing rod 44 is a cylinder with internal threads at two ends, and the length of the pump body fixing rod 44 is used for adapting the number of the third pump shell 413 and the impellers 42 so as to raise the pressure of the heat insulation pump.

In this embodiment, the outer magnetic steel 51 includes an outer magnetic steel body 511, an even number of outer magnetic strips 512, an outer magnetic strip fixing ring 513 and a fixing screw 514; the outer magnetic steel body 511 is a cylinder and comprises a motor shaft fixing part 5111, an outer magnetic strip fixing part 5112 and an outer magnetic strip fixing ring positioning part 5113; the motor fixing part 5111 is axially provided with a concentric through hole, the inner wall of the concentric through hole is precisely and fixedly matched with the outer wall of the output shaft of the motor 1, the motor shaft fixing part 5111 is radially provided with a threaded through hole, and the outer magnetic steel 51 and the output shaft of the motor 1 are fixed through a fixing screw; even number of outer magnetic stripe fixing cavities are uniformly distributed on the circumference of the inner edge of the outer magnetic stripe fixing part 5112, the sizes of the outer magnetic stripe fixing cavities are precisely matched with the sizes of the outer magnetic stripes 512 in a fixed mode, the outer magnetic stripes 512 are rectangular, the polarities of the adjacent outer magnetic stripes 512 in the outer magnetic stripe fixing part 5112 are opposite, and the outer magnetic stripes 512 are fixed in the outer magnetic stripe fixing cavities; the inner edge envelope of the magnetic stripe formed after the outer magnetic stripe 512 is installed is matched with the outer wall of the isolation sleeve closing section 21 and keeps a gap, and under specific working conditions, the smaller the gap is, the better the gap is; the outer magnetic stripe fixing ring 513 is disposed on the outer magnetic stripe fixing ring positioning part 5113;

The inner magnetic steel 52 comprises an inner magnetic steel body 521, an even number of inner magnetic strips 522 and inner magnetic strip fixing rings 523; the inner magnetic steel body 521 is a cylinder and comprises a pump shaft fixing part 5211, an inner magnetic stripe fixing cavity 5212 and an inner magnetic stripe fixing ring sealing part 5213, wherein the inner magnetic stripe fixing cavity 5212 and the inner magnetic stripe fixing ring sealing part 5213 are uniformly distributed on the circumference, a through hole is formed in the axial direction of the pump shaft fixing part 5211, and the inner wall of the through hole is in precise fit with the outer wall of the small diameter 3141 of the shaft sleeve 314; two keyways 5214 which are identical in height with the inner magnetic steel body 521 and distributed in a 180-degree mirror image mode are arranged on the through hole, and the width of each keyway 5214 and the inner clear distance between the two keyways are identical with the diameter and the length of the shaft pin 313; the size of the inner magnetic stripe fixing cavity 5212 is fixedly matched with the size of the inner magnetic stripe 522; the inner magnetic stripe 522 is a rectangular body, the polarities of adjacent inner magnetic stripes 522 in the inner magnetic stripe fixing cavity 5212 are opposite, and the inner magnetic stripe 522 is sealed in the inner magnetic steel body 521 through the inner magnetic stripe fixing ring sealing part 5213; the number of inner magnetic stripes 522 is equal to the number of outer magnetic stripes 512.

As shown in fig. 20, the present embodiment further provides an application of the immersed static seal heat-insulating pump, which is applied to a totally enclosed high-low temperature circulation system, wherein the totally enclosed high-low temperature circulation system comprises an immersed static seal heat-insulating pump 71, a bath container 72, an expansion container 73, an expansion container connecting pipe 74, a heat conducting medium 75, a circulation inlet pipe 76 and an external circulation pipe 76; the first flange 22 of the immersed static seal heat-insulating pump 71 is fixed with the flange of the bath container 72 in a sealing way through screws and sealing rings; an expansion vessel connecting pipe 74 connects the bath vessel 72 and the expansion vessel 73 in a sealed manner, and the heat-conducting medium 75 passes through the expansion vessel 73 to enter and exit the bath vessel 72; the external circulation pipe 77 is used for connection of external application systems to the pump outlet pipe 26 and the circulation inlet pipe 76.

The embodiment also provides a heat insulation circulation method of the totally-enclosed high-low temperature circulation system, which comprises the following steps:

s1, injecting a heat conducting medium 75 into an expansion container 73, wherein the heat conducting medium 75 enters the bath container 72 from an expansion container connecting pipe 74 by gravity, and air is discharged from a pump outlet pipe 26 or a circulating inlet pipe 76, wherein the air in the isolation sleeve closing section 21 and the air between the first flange plate 24 and the second flange plate 25 and outside the isolation sleeve opening section 22 are retained and cannot be completely discharged;

s2, connecting an external application system with the pump outlet pipe 26 and the circulating inlet pipe 76 by using an external circulating pipe 77, and keeping the tightness of the totally-enclosed high-low temperature circulating system;

s3, starting medium circulation of the totally-enclosed high-low temperature circulation system, wherein the medium circulation comprises an outer circulation flow 61 and an inner circulation flow 62, the flow and the pressure of the totally-enclosed high-low temperature circulation system are realized through the outer circulation flow 61, and the lubrication of the first bearing group 32 is realized through the inner circulation flow 62; the residual air in the spacer sleeve closing section 21 is further compressed by the combined action of the pump pressure and the medium vapor pressure in the closed system, the liquid medium is sucked or discharged by the combined action of the atmospheric pressure and the medium vapor pressure in the closed system, and the air between the first flange 24 and the second flange 25 and outside the spacer sleeve opening section 22 is compressed or expanded by the combined action of the atmospheric pressure and the medium vapor pressure in the closed system;

S4, starting temperature control of a totally-enclosed high-low temperature circulation system, wherein in the heating process, the heat conducting medium 75 expands, the expanded heat conducting medium 75 enters the expansion container 74 according to the pressure of the totally-enclosed system, in the cooling process, the heat conducting medium 75 contracts, and the heat conducting medium 75 in the expansion container 74 enters the bath container 72 according to gravity; decreasing the flow of the inner circulation flow 62 and blocking the flow of the medium in the closed section 21 of the spacer sleeve increases the insulation distance between the first flange 24 and the second flange 25 to improve the insulation between the high and low temperature liquid medium and the first flange 24 and the motor 1 and the insulation circulation of the totally enclosed high and low temperature circulation system.

In this embodiment, the liquid flow direction of the external circulation flow 61 is as follows:

a pump housing platen 43, a platen circular through hole 431;

a first pump casing 411, a pump casing circular flange through hole 4113;

an impeller 42, a second blade 422, an impeller circular flange through hole 4221;

an impeller flowpath 424;

a second pump housing 412, a pump housing flow passage 4123;

a second pump casing 412, a pump casing circular flange through hole 4113;

an impeller flowpath 424;

a third pump casing 413, a pump casing flow passage 4123;

a third pump casing 413, a pump casing circular flange through hole 4113;

impeller flowpath 424, third pump casing 413;

a second flange 25, a fifth through hole 252;

a pump outlet tube 26;

the liquid flow direction of the inner recycle stream 62 is as follows:

a first pump housing platen 43, a platen circular through hole 431;

a first pump casing 411, a pump casing circular flange through hole 4113;

an impeller flowpath 424;

a second pump housing 412, a pump housing flow passage 4123;

a second pump casing 412, a pump casing circular flange through hole 4113;

an impeller flowpath 424;

a third pump casing 413, a pump casing flow passage 4123;

a third pump casing 413, a pump casing circular flange through hole 4113;

impeller flowpath 424, third pump casing 413;

a second flange 25 and a fourth through hole 251;

a spacer open section 22;

a first bearing set 32;

an inner circulation pipe 222.

In this example, the flow rate of the inner circulation stream of the medium circulation is less than 1% of the outer circulation stream.

1. The unique heat insulation and sealing structure design of the embodiment limits the air removal in the sealing section of the isolation sleeve and the heat insulation space between the first flange plate and the second flange plate and outside the opening section of the isolation sleeve, the medium circulation is only carried out in the external circulation flow and can not enter the sealing section of the isolation sleeve of the pump body base, and the medium which is used for bearing lubrication and enters the opening section of the isolation sleeve in the internal circulation flow is less than 1% of the whole external circulation flow, thereby greatly reducing the direct contact and heat transfer between a high-low temperature medium and the pump body base, blocking the heat exchange among the first flange plate, the motor, the internal magnetic steel and the heat conducting medium, reducing the energy loss and the temperature resistance grade requirements along with the motor and the internal magnetic steel, and prolonging the service life of the motor, the internal magnetic steel and parts around the heat insulation pump;

3. compared with the traditional magnetic force driven high-temperature centrifugal pump and the vortex type booster pump, the immersed static seal heat insulation pump of the embodiment has higher efficiency and temperature resistance; compared with the traditional mechanical seal multistage booster pump, except for static flange sealing of the pump body base, the immersed static seal heat-insulating pump of the embodiment has no dynamic mechanical seal and other seals in any form, so that the sealing performance, safety and reliability of the pump body are greatly improved;

4. the totally-enclosed high-low temperature constant temperature circulation system using the immersed static seal heat-insulating pump of the embodiment has less heat leakage and good sealing property, and can thoroughly solve the problems of safety and reliability such as leakage, temperature rise and the like of the system in the prior art;

5. the heat insulation method of the immersed static seal heat insulation pump can improve the energy efficiency of the system, reduce the requirements of temperature resistance levels of the motor and the inner magnetic steel, and improve the safety and the reliability.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims

1. The immersed static seal heat-insulating pump is characterized by comprising a motor, a pump body base, a pump shaft sleeve, a pump body assembly and a magnetic steel set;

the motor is fixed above the pump body base; the first flange plate is provided with a first through hole and a second through hole, the second flange plate is provided with a fourth through hole and a fifth through hole, and the first flange plate and the second flange plate are arranged in parallel and keep heat insulation distance; the first through hole and the fourth through hole are concentric, and the isolation sleeve penetrates through the first through hole and the fourth through hole and is circumferentially sealed with the first through hole and the fourth through hole; the second through hole and the fifth through hole are concentric, and the pump outlet pipe penetrates through the second through hole and the fifth through hole and is circumferentially sealed with the second through hole and the fifth through hole; the isolation sleeve is an inverted barrel-shaped cylinder with a closed upper end and an open bottom end, the isolation sleeve is divided into an isolation sleeve closing section and an isolation sleeve opening section by taking a first flange plate as a boundary, an inner circulation pipe through hole is formed in the isolation sleeve opening section, which is close to the first flange plate, an L-shaped inner circulation pipe with an opening facing to the second flange plate is arranged on the inner circulation pipe through hole, a first bearing group fixing part is arranged below the inner circulation pipe through hole and on the inner wall of the isolation sleeve opening section, and the outer wall of the first bearing group is matched with the inner wall of the first bearing group fixing part;

the outer diameter of the inner magnetic steel is matched with the inner diameter of the sealed section of the isolation sleeve, and a gap is kept; the outer magnetic steel is arranged outside the isolation sleeve sealing section and magnetically coupled with the inner magnetic steel.

2. The immersed static seal heat-insulating pump as claimed in claim 1, wherein at least 3 motor support rods which are uniformly distributed around the periphery of the isolating sleeve sealing section and are perpendicular to the first flange plate are arranged above the first flange plate, threaded blind holes are formed in the upper end of the motor support rods and at the end fixed with the motor, and the motor is fixedly connected with the threaded blind holes of the motor support rods through screws and heat-insulating gaskets; and a plurality of third through holes uniformly distributed on the circumference are arranged on the peripheral plane of the first flange plate.

3. The immersed static seal heat-insulating pump as claimed in claim 1, wherein a plurality of sixth through holes uniformly distributed on the circumference are arranged on the periphery of the second flange plate; the pump outlet pipe is an r-shaped pipe and comprises a first straight pipe, a bending part and a second straight pipe, the first straight pipe, the bending part and the second straight pipe are connected through the pipes in sequence, the first straight pipe penetrates through the second through hole and the fifth through hole respectively, and the tail end of the second straight pipe is provided with a sealing part; the axis of the second straight pipe is perpendicular to the axis of the isolation sleeve; the second flange plate comprises a ring-shaped sealing reinforcing rib with a rectangular cross section, and the ring-shaped sealing reinforcing rib is in sealing fit with the joint part of the pump shell assembly.

4. The immersed static seal heat-insulating pump according to claim 1, wherein the pump shaft comprises a magnetic steel fixing part, a middle part and an impeller fixing part from top to bottom, the magnetic steel fixing part comprises an internal threaded hole, a shaft pin hole and a first bearing group special-shaped cutting surface, the impeller fixing part comprises an impeller special-shaped cutting surface and external threads, and the middle part is connected with the magnetic steel fixing part and the impeller fixing part;

The second bearing group comprises a second thrust ring, a second static ring and a second movable ring, the inner wall of the second static ring is in precise sliding fit with the outer wall of the second movable ring, the outer wall of the second static ring is in precise fixed fit with a static ring fixing cavity of a second pump shell, and the inner diameters and the shapes of the second movable ring and the second thrust ring are in precise fixed fit with the special-shaped cutting surface of the impeller of the pump shaft; the end face, contacted with the second static ring, of the second thrust ring freely slides, and the second thrust ring is used for supporting the axial upward thrust of the pump shaft sleeve;

the first fixing part comprises a screw, a first gasket, a shaft pin and a shaft sleeve; the shaft sleeve is a reducing steel pipe and comprises a small diameter and a large diameter, the inner wall of the shaft sleeve is in precise fixed fit with the outer wall of the magnetic steel fixing part, and the outer wall of the small diameter is in precise fixed fit with the inner wall of the inner magnetic steel; the small diameter is provided with 2 through holes, and the shaft pin positions the shaft sleeve to the pump shaft through the through holes; the screw and the first gasket lock the inner magnetic steel, the first movable ring, the first thrust ring and the first bearing set adjusting sleeve on the pump shaft;

The second fixing part comprises a guide sleeve, a second gasket and a locking nut, and the guide sleeve, the second gasket and the locking nut are matched with external threads of the impeller fixing part to fix the impeller, the second movable ring, the second thrust ring, the second bearing group adjusting sleeve and the pump shaft in a locking mode.

5. The immersed static seal heat-insulating pump as claimed in claim 1, wherein the first pump shell is disc-shaped and consists of a side wall and a bottom plate, and a pump shell circular flanging through hole is arranged at the center position of the bottom plate;

the impeller comprises a first blade, a second blade and a plurality of blade guide strips; all the vane guide strips are radially and uniformly distributed, and the space formed between the first vane and the second vane is divided into a plurality of impeller flow channels; the center of the first blade is provided with a blade special-shaped through hole, the shape and the size of the blade special-shaped through hole are precisely and fixedly matched with the impeller special-shaped cutting surface of the impeller fixing part, the center of the second blade is provided with an impeller round flanging through hole, and the diameter and the flanging height of the impeller round flanging through hole are matched with the diameter and the flanging height of the pump shell round flanging through hole.

6. The submersible static seal heat pump as recited in claim 5 wherein the pump housing assembly further comprises at least one third pump housing, the third pump housing comprising a third partition and a plurality of flow bars, all of the flow bars being radially and evenly distributed and dividing a space formed between the third partition and the bottom plate into a plurality of pump housing flow passages; and a circular boss through hole is formed in the center of the third partition plate.

7. The immersed static seal heat insulating pump as claimed in claim 1, wherein the pump casing pressure plate is a rigid flat plate, a pressure plate circular through hole is arranged at the center of the pressure plate circular through hole, and the diameter of the pressure plate circular through hole is matched with the diameter of the pump casing circular flanging through hole of the first pump casing; the pump body dead lever is the cylinder that both ends are equipped with the internal thread.

8. The immersed static seal heat-insulating pump of claim 1, wherein the outer magnetic steel comprises an outer magnetic steel body, an even number of outer magnetic strips, outer magnetic strip fixing rings and fixing screws; the outer magnetic steel body is a cylinder and comprises a motor shaft fixing part, an outer magnetic strip fixing part and an outer magnetic strip fixing ring positioning part; the motor shaft fixing part is axially provided with a concentric through hole, the inner wall of the concentric through hole is in precise fixed fit with the outer wall of the output shaft of the motor, the motor shaft fixing part is radially provided with a threaded through hole, and the external magnetic steel and the output shaft of the motor are fixed through a fixing screw; even number of outer magnetic stripe fixing cavities are uniformly distributed on the circumference of the inner edge of the outer magnetic stripe fixing part, the sizes of the outer magnetic stripe fixing cavities are precisely and fixedly matched with the sizes of the outer magnetic stripes, the outer magnetic stripes are rectangular, the polarities of the adjacent outer magnetic stripes in the outer magnetic stripe fixing part are opposite, and the outer magnetic stripes are fixed in the outer magnetic stripe fixing cavities; the inner edge envelope curve of the magnetic stripe formed after the outer magnetic stripe is installed is matched with the outer diameter of the closing section of the isolation sleeve, and a gap is kept; the outer magnetic stripe fixing ring is arranged on the outer magnetic stripe fixing ring positioning part;

9. The use of the immersed static seal heat-insulating pump according to any one of claims 1 to 8 in a totally enclosed high and low temperature circulation system comprising the immersed static seal heat-insulating pump, a bath container, an expansion container connecting pipe, a heat conducting medium, a circulation inlet pipe and an outer circulation pipe; the first flange of the immersed static seal heat-insulating pump is fixed with the flange of the bath container in a sealing way through screws and sealing rings; the expansion container connecting pipe is used for sealing and communicating the bath container with the expansion container, and the heat conducting medium enters and exits the bath container through the expansion container; the outer circulation tube is used for connection of an external application system and the pump outlet tube, and the circulation inlet tube.

10. The heat insulation circulation method of the totally enclosed high and low temperature circulation system according to claim 9, comprising the steps of:

s1, injecting a heat-conducting medium into an expansion container, enabling the heat-conducting medium to enter a bath container from an expansion container connecting pipe by means of gravity, and exhausting air from a pump outlet pipe or a circulating inlet pipe, wherein the air positioned in a closing section of the isolation sleeve and the air positioned between a first flange plate and a second flange plate and outside an opening section of the isolation sleeve are retained and cannot be completely exhausted;

s2, connecting an external application system, the pump outlet pipe and the circulating inlet pipe by using the outer circulating pipe, and maintaining the tightness of the totally-enclosed high-low temperature circulating system;