Split type magnetic connection expansion machine

Abstract

The invention discloses a split type magnetic connection expansion machine. The split type magnetic connection expansion machine comprises a main shell, an isolation piece and an energy recovery device which are sequentially connected in a sealed mode in the first direction. An opening is formed in the first end, in the first direction, of the main shell, an impeller is arranged in the opening, a first magnetic connecting disc is arranged at the second end, in the first direction, of the main shell, and the impeller and the first magnetic connecting disc are connected through an input shaft. The energy recovery device comprises a recovery shaft and a recovery shell located on the outer side of the recovery shaft, and a second magnetic connecting disc is installed on the recovery shaft. The separator is sealed and isolated between the main shell and the recovery shell, the first magnetic connection disc and the second magnetic connection disc are located on the two sides of the separator in the first direction respectively and are spaced from the separator, and the second magnetic connection disc is magnetically driven by the first magnetic connection disc. According to the split type magnetic connection expansion machine, axial zero leakage is achieved, the isentropic efficiency is improved, and meanwhile the energy recovery efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of hydrogen liquefaction key equipment, and particularly relates to a split type magnetic coupling expander. BACKGROUND

[0002] With the development of science and technology and the continuous progress of energy utilization, super-low temperature liquid plays an increasingly important role, and the preparation of super-low temperature liquid has become a key technology in the field. At present, in the process of obtaining super-low temperature liquid, an expander as core equipment is a key to improving the efficiency of the whole process.

[0003] The working principle of the expander is that high-pressure gas expands to do work, converts internal energy into mechanical energy, and outputs the mechanical energy to the outside through the expander, and the enthalpy of the expanded gas is continuously reduced, so that the purpose of refrigeration is achieved. In the working process of the expander, for small molecules and low viscosity gases such as hydrogen, the traditional structure adopts a mechanical transmission and dynamic sealing working mode. The dynamic sealing cannot achieve axial zero leakage, and the mechanical transmission mode outputs and recovers the mechanical energy, which reduces the isentropic efficiency and is low in energy recovery efficiency. SUMMARY

[0004] The purpose of the application scheme is to provide a split type magnetic coupling expander, which realizes axial zero leakage, improves isentropic efficiency, and improves energy recovery efficiency.

[0005] The split type magnetic coupling expander provided by the application scheme comprises a main shell, a separation piece and an energy recovery device which are sequentially and sealingly connected along a first direction; the main shell is provided with an opening at a first end in the first direction, the opening is provided with an impeller, a first magnetic coupling disc is arranged at a second end of the main shell in the first direction, and the impeller and the first magnetic coupling disc are connected through an input shaft; the energy recovery device comprises a recovery shaft and a recovery shell located outside the recovery shaft, and a second magnetic coupling disc is arranged on the recovery shaft; the separation piece is sealingly separated between the main shell and the recovery shell, the first magnetic coupling disc and the second magnetic coupling disc are respectively located on two sides of the separation piece in the first direction and are spaced from the separation piece, and the second magnetic coupling disc is magnetically driven by the first magnetic coupling disc.

[0006] Optionally, a heat insulation block, a radial bearing and a first baffle are further arranged in the main shell, and the first baffle is fixed in the main shell; along the first direction, the impeller, the heat insulation block, the radial bearing and the first baffle are sequentially arranged on the input shaft.

[0007] Optionally, the input shaft comprises, in sequence along the first direction, an impeller section, a thermal insulation section, and a transmission section, the thermal insulation section has an outer diameter greater than that of the impeller section to define a first step at the interface, and the transmission section has an outer diameter greater than that of the thermal insulation section to define a second step at the interface; the impeller is sleeved on the impeller section and abuts against the first step, the thermal insulation block is sleeved on the thermal insulation section and abuts against the second step, and the radial bearing and the first baffle are both sleeved on the transmission section.

[0008] Optionally, the main housing further comprises, in sequence along the first direction, a first thrust bearing, a thrust disc, a second thrust bearing, and a second baffle, all of which are sleeved on the transmission section and abut against each other; the first thrust bearing abuts against the first baffle on the side opposite to the thrust disc along the first direction.

[0009] Optionally, the input shaft further comprises a connecting section connected to the transmission section, the connecting section has an outer diameter less than that of the transmission section to define a third step at the interface; the first magnetic coupling disc is sleeved on the connecting section and abuts against the second baffle and the third step.

[0010] Optionally, the isolator comprises a universal interface, the universal interface comprises a universal flange, and the universal flange is detachably connected to a mating flange on the energy recovery device.

[0011] Optionally, the isolator comprises a first flat plate arranged between the first magnetic coupling disc and the second magnetic coupling disc, and the first flat plate is connected to the universal interface; the end face of the first magnetic coupling disc and the end face of the second magnetic coupling disc are both parallel to the first flat plate.

[0012] Optionally, the isolator comprises a second flat plate arranged between the first magnetic coupling disc and the second magnetic coupling disc, and the second flat plate is connected to the universal interface; among the end face of the first magnetic coupling disc and the end face of the second magnetic coupling disc, one is perpendicular to the second flat plate, and the other is parallel to the second flat plate.

[0013] Optionally, the outer edge of the first magnetic coupling disc is provided with a magnetic material, and the straight-line distance of the outer edge of the first magnetic coupling disc from the center is adjustably arranged.

[0014] Optionally, the isolation piece comprises a folded plate arranged between the first magnetic coupling disc and the second magnetic coupling disc, the folded plate is connected with the universal interface, the folded plate comprises a first sub-plate, a second sub-plate and a third sub-plate connected vertically in sequence, the first sub-plate and the third sub-plate are arranged in parallel with the second sub-plate to define an isolation cavity; an end surface of the second magnetic coupling disc is provided with a containing cavity, the folded plate is located in the containing cavity, the first magnetic coupling disc is located in the isolation cavity, and an end surface of the first magnetic coupling disc and a bottom surface of the containing cavity are respectively located on two sides of the second sub-plate along a first direction and are parallel to the first sub-plate.

[0015] By adopting the technical scheme, the following beneficial effects are achieved:

[0016] The split type magnetic coupling expander in the embodiment of the application is in the static sealing interval of the isolation piece, the first magnetic coupling disc and the second magnetic coupling disc are in contactless magnetic connection, the first magnetic coupling disc drives the second magnetic coupling disc to rotate when the first magnetic coupling disc rotates, and the rotating energy is transmitted to the recovery shaft for energy recovery, in the above process, the contactless energy transmission is adopted, axial zero leakage is achieved, the loss caused by contact in the energy transmission process is avoided, the efficiency and energy recovery rate of the expander are improved, the isentropic efficiency is further improved, gas diffusion in the main shell to the recovery shell is avoided, and gas pollution is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic diagram of a split type magnetic coupling expander in an embodiment of the application.

[0018] Figure 2 FIG. 4 is a structural schematic diagram of an input shaft in an embodiment of the application.

[0019] Figure 3 FIG. 6 is a structural schematic diagram of an isolation piece arranged between a first magnetic coupling disc and a second magnetic coupling disc in an embodiment of the application.

[0020] Figure 4 FIG. 8 is a structural schematic diagram of an isolation piece arranged between a first magnetic coupling disc and a second magnetic coupling disc in another embodiment of the application.

[0021] Figure 5 FIG. 10 is a structural schematic diagram of an isolation piece arranged between a first magnetic coupling disc and a second magnetic coupling disc in another embodiment of the application.

[0022] REFERENCE SIGNS

[0023] 1-Main shell, 100-Expansion shell, 101-Middle shell, 102-End shell, 10-Opening, 11-Impeller, 12-First magnetic connecting plate, 13-Heat insulation block, 14-Radial bearing, 15-First thrust bearing, 16-Thrust plate, 17-Second thrust bearing, 18-Gas passage.

[0024] 2-Isolator, 20-General interface, 21-First plate, 22-Second plate, 23-Folding plate, 230-First sub-board, 231-Second sub-board, 232-Third sub-board.

[0025] 3-Energy recovery device, 30-Recovery shaft, 31-Recovery shell, 32-Second magnetic connecting plate.

[0026] 4-Input shaft, 40-Impeller section, 41-Insulation section, 42-Transmission section, 43-First step, 44-Second step, 45-Connecting section, 46-Third step. Detailed Implementation

[0027] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0028] It is readily understood that, based on the technical solution of this invention, various structural and implementation methods can be interchanged by those skilled in the art without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of the invention.

[0029] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0030] like Figure 1 As shown, this application provides a split-type magnetically coupled expander, including a main housing 1, an isolation component 2, and an energy recovery device 3 sequentially and sealed together along a first direction. The isolation component 2 and the energy recovery device 3 are detachably connected. This split-type magnetically coupled expander is suitable for the liquefaction of various gases, including but not limited to helium and hydrogen.

[0031] The main housing 1 has an opening 10 at its first end along a first direction, and an impeller 11 is disposed within the opening 10. A first magnetic connecting disk 12 is disposed at the second end of the main housing 1 along the first direction. The impeller 11 and the first magnetic connecting disk 12 are connected via an input shaft 4. The input shaft 4 is the main shaft of the expansion cooling end, and its dimensions are determined by design parameters.

[0032] The energy recovery device 3 includes a recovery shaft 30 and a recovery shell 31 located outside the recovery shaft 30. A second magnetic coupling disk 32 is installed on the recovery shaft 30.

[0033] The isolator 2 is sealed between the main housing 1 and the recovery shell 31. That is, one side of the isolator 2 along the first direction defines a first sealed space with the main housing 1, and the other side of the isolator 2 along the first direction defines a second sealed space with the recovery shell 31. The first sealed space and the second sealed space are relatively independent. The first magnetic connecting disk 12 and the second magnetic connecting disk 32 are respectively located on both sides of the isolator 2 along the first direction and are spaced apart from the isolator 2. The magnetic material on the second magnetic connecting disk 32 is magnetically attracted to the magnetic material on the first magnetic connecting disk 12, thus connecting the first magnetic connecting disk 12 and the second magnetic connecting disk 32. Driven by the magnetic attraction force, the second magnetic connecting disk 32 rotates synchronously with the first magnetic connecting disk 12.

[0034] The first direction in this embodiment can be the direction of the central axis of the input shaft 4, or the direction parallel to the central axis of the input shaft 4.

[0035] In this embodiment of the application, a gas channel 18 is provided in the side wall of the first end of the main housing 1. The gas channel 18 extends from the end face of the first end of the main housing 1 to the side of the impeller 11. The gas introduced into the gas channel 18 drives the impeller 11 to rotate.

[0036] In this embodiment, the separator 2 is made of a magnetically permeable material, which may be metal, carbon fiber composite material, plastic, glass, etc.

[0037] In this embodiment, the first magnetic coupling disk 12 is a key structure for axial power output. The mechanical energy of the input shaft 4 is transmitted to the recovery shaft 30 of the energy recovery device 3 by magnetic connection with the first magnetic coupling disk 12. The recovery shaft 30 is the power source of the energy recovery device 3.

[0038] In this embodiment, the energy recovery device 3 includes a device for storing axial mechanical energy, including but not limited to a device for recovering energy by means of compressed gas, power generation, and boosting potential energy. The energy input end of the device is connected to the recovery shaft 30.

[0039] In this embodiment of the split-type magnetically connected expander, under the static sealing interval of the isolator 2, the first magnetic connecting disk 12 and the second magnetic connecting disk 32 achieve contactless magnetic connection. When the first magnetic connecting disk 12 rotates, it drives the second magnetic connecting disk 32 to rotate, transferring the rotational energy to the recovery shaft 30 for energy recovery. In the above process, through contactless energy transfer, this application achieves zero axial leakage, avoiding losses caused by contact during energy transfer, improving the efficiency and energy recovery rate of the expander, which is conducive to further improving the isentropic efficiency. At the same time, it avoids the diffusion of gas in the main shell 1 to the recovery shell 31, thus avoiding gas pollution.

[0040] In an optional embodiment, the main housing 1 is further provided with a heat insulation block 13, a radial bearing 14, and a first baffle, the first baffle being fixed inside the main housing 1. Along a first direction, the impeller 11, the heat insulation block 13, the radial bearing 14, and the first baffle are sequentially sleeved on the input shaft 4. The heat insulation block 13 serves to insulate the low-temperature impeller 11 and the normal-temperature radial bearing 14, thus isolating the cold energy at the opening 10. The radial bearing 14 is used to maintain the radial stability of the input shaft 4 and the components located on the input shaft 4. The radial bearing 14 includes, but is not limited to, hydrostatic bearings, dynamic bearings, hybrid hydrostatic bearings, or magnetic bearings. The first baffle serves to axially limit the radial bearing 14, stably confining the heat insulation block 13 and the radial bearing 14 between the impeller 11 and the first baffle.

[0041] In an optional embodiment, the input shaft 4 includes an impeller section 40, a heat insulation section 41, and a transmission section 42 arranged sequentially along a first direction. The outer diameter of the heat insulation section 41 is larger than the outer diameter of the impeller section 40 to define a first step 43 at the mating point. The outer diameter of the transmission section 42 is larger than the outer diameter of the heat insulation section 41 to define a second step 44 at the mating point. The impeller 11 is fitted onto the impeller section 40 and abuts against the first step 43. The heat insulation block 13 is fitted onto the heat insulation section 41 and abuts against the second step 44. The radial bearing 14 and the first baffle are both fitted onto the transmission section 42. Figure 2 As shown, the first step 43 and the second step 44 cooperate with each other. By modifying the structure of the input shaft 4, the first step 43 plays an axial limiting role for the impeller 11, and the second step 44 plays an axial limiting role for the heat insulation block 13, thereby increasing the stability of the impeller 11 and the heat insulation block 13 on the input shaft 4.

[0042] In an optional embodiment, the main housing 1 further includes a first thrust bearing 15, a thrust plate 16, a second thrust bearing 17, and a second baffle, which are sequentially sleeved on and abut against the transmission section 42 along a first direction. The side of the first thrust bearing 15 facing away from the thrust plate 16 along the first direction abuts against the first baffle. The thrust bearing in this embodiment is used to maintain the axial balance and stability of the input shaft 4 and the components located on the input shaft 4. The optional structural forms of the thrust bearing include, but are not limited to, hydrostatic bearings, hydrodynamic bearings, hybrid hydrostatic bearings, and magnetic bearings. The thrust plate 16 transmits the bearing force of the first thrust bearing 15 and the second thrust bearing 17 to the axial direction of the input shaft 4.

[0043] In one optional embodiment of this application, the main housing 1 includes an expansion shell 100, a middle shell 101, and an end shell 102 that are sequentially sealed together along a first direction via flange connections. The opening 10, impeller 11, and heat insulation block 13 are all disposed within the expansion shell 100. A radial bearing 14 is disposed within the middle shell 101, and a first baffle is fixed to one end of the middle shell 101 along the first direction. A first thrust bearing 15, a thrust plate 16, and a second thrust bearing 17 are disposed within the end shell 102, and a second baffle is fixed to the middle shell 101. A first magnetic coupling plate 12 is disposed at one end of the end shell 102 along the first direction.

[0044] In an optional embodiment, the input shaft 4 further includes a connecting section 45 connected to the transmission section 42, the outer diameter of the connecting section 45 being smaller than the outer diameter of the transmission section 42 to define a third step 46 at the mating point. The first magnetic coupling disk 12 is sleeved on the connecting section 45 and abuts against both the second baffle and the third step 46. Figure 2 As shown in the embodiment of this application, the third step 46 and the second baffle are coplanarly arranged facing the first magnetic connecting disk 12, which together play an axial limiting role for the first magnetic connecting disk 12 and increase the stability of the first magnetic connecting disk 12.

[0045] In an optional embodiment, the isolation element 2 includes a universal interface 20, which includes a universal flange that is detachably connected to a docking flange on the energy recovery device 3. The universal flange offers high adaptability; various energy recovery devices 3 can be flexibly assembled with expanders by installing docking flanges that are compatible with the universal flange. This allows for multi-purpose use and offers advantages such as energy efficiency, ease of use, and safety, ultimately improving the overall performance of the expander.

[0046] In an optional embodiment, the isolation member 2 further includes a first plate 21 disposed between the first magnetic coupling disk 12 and the second magnetic coupling disk 32, the first plate 21 being connected to the universal interface 20, and the end faces of both the first magnetic coupling disk 12 and the second magnetic coupling disk 32 being parallel to the first plate 21. Figure 3 As shown, the first magnetic connecting plate 12 and the second magnetic connecting plate 32 are connected in a planar manner. The first plate 21 is sealed between the first magnetic connecting plate 12 and the second magnetic connecting plate 32. The universal interface 20 is connected to the outer periphery of the first plate 21 to install the isolation member 2 between the main housing 1 and the recovery housing 31.

[0047] In an optional embodiment, the isolator 2 includes a second plate 22 disposed between the first magnetic coupling disk 12 and the second magnetic coupling disk 32. The second plate 22 is connected to the universal interface 20. Of the end faces of the first magnetic coupling disk 12 and the second magnetic coupling disk 32, one is perpendicular to the second plate 22, and the other is parallel to the second plate 22. Figure 4 As shown, the first magnetic connecting plate 12 and the second magnetic connecting plate 32 are connected at an angle. The second plate 22 is sealed between the first magnetic connecting plate 12 and the second magnetic connecting plate 32. The universal interface 20 is connected to the outer periphery of the second plate 22 to install the isolation member 2 between the main housing 1 and the recovery housing 31.

[0048] In an optional embodiment, the outer edge of the first magnetic connecting disk 12 is provided with magnetic material, and the linear distance between the outer edge of the first magnetic connecting disk 12 and the center is adjustable. In this embodiment, the first magnetic connecting disk 12 drives the second magnetic connecting disk 32 to rotate through the magnetic material on its outer edge. By adjusting the size of the outer edge, the linear velocity of the magnetic material on the outer edge is adjusted, thereby adjusting the rotation speed of the second magnetic connecting disk 32, achieving multiple functions in one device, with advantages of energy saving, high efficiency, ease of use, and safety and reliability. The outer edge of the first magnetic connecting disk 12 can be the outer surface of the first magnetic connecting disk 12 or a position 0-10mm away from the outer surface.

[0049] In an optional embodiment, the isolation member 2 includes a folding plate 23 disposed between the first magnetic connecting disk 12 and the second magnetic connecting disk 32. The folding plate 23 includes a first partition 230, a second partition 231, and a third partition 232 connected vertically in sequence. The first partition 230 and the third partition 232 are arranged parallel to each other and define an isolation cavity with the second partition 231. The folding plate 23 is connected to the universal interface 20. The end face of the second magnetic connecting disk 32 has a receiving cavity, and the folding plate 23 is located within the receiving cavity. The first magnetic connecting disk 12 is located within the isolation cavity. The end face of the first magnetic connecting disk 12 and the bottom face of the receiving cavity are located on both sides of the second partition 231 along a first direction and are both parallel to the first partition 230. Figure 5 As shown, the first magnetic connecting plate 12 and the second magnetic connecting plate 32 are connected in a coaxial manner, that is, the central axis of the input shaft 4 and the central axis of the recovery shaft 30 are collinear. The second plate 22 is sealed between the first magnetic connecting plate 12 and the second magnetic connecting plate 32. The universal interface 20 is connected to the outer periphery of the second plate 22 to install the isolation member 2 between the main housing 1 and the recovery housing 31.

[0050] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0051] The above are merely the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of the present invention, and these modifications should also be considered within the scope of protection of the present invention.

Claims

1. A split-type magnetically connected expander, characterized in that, It includes a main housing, an isolation component, and an energy recovery device that are sequentially and sealed together along a first direction; The main housing has an opening at a first end along a first direction, and an impeller is disposed in the opening. The main housing has a first magnetic connecting disk at a second end along the first direction, and the impeller and the first magnetic connecting disk are connected by an input shaft. The energy recovery device includes a recovery shaft and a recovery shell located outside the recovery shaft, and a second magnetic coupling disk is installed on the recovery shaft; The isolator is sealed between the main housing and the recovery housing. The first magnetic connecting plate and the second magnetic connecting plate are located on both sides of the isolator along the first direction and are spaced apart from the isolator. The second magnetic connecting plate is magnetically driven by the first magnetic connecting plate.

2. The split-type magnetically connected expander according to claim 1, characterized in that, The main housing is also provided with a heat insulation block, a radial bearing and a first baffle, the first baffle being fixed inside the main housing; Along the first direction, the impeller, the heat insulation block, the radial bearing, and the first baffle are sequentially sleeved on the input shaft.

3. The split-type magnetically connected expander according to claim 2, characterized in that, The input shaft includes an impeller section, a heat insulation section, and a transmission section arranged sequentially along a first direction. The outer diameter of the heat insulation section is larger than the outer diameter of the impeller section to define a first step at the joint. The outer diameter of the transmission section is larger than the outer diameter of the heat insulation section to define a second step at the joint. The impeller is sleeved on the impeller section and abuts against the first step, the heat insulation block is sleeved on the heat insulation section and abuts against the second step, and the radial bearing and the first baffle are both sleeved on the transmission section.

4. The split-type magnetically connected expander according to claim 3, characterized in that, The main housing is also provided with a first thrust bearing, a thrust plate, a second thrust bearing, and a second baffle that are sequentially sleeved on the transmission section and abut against each other along the first direction; The first thrust bearing abuts against the first baffle on the side facing away from the thrust disc along the first direction.

5. The split-type magnetically connected expander according to claim 4, characterized in that, The input shaft also includes a connecting section connected to the transmission section, the outer diameter of the connecting section being smaller than the outer diameter of the transmission section to define a third step at the mating point; The first magnetic connecting disc is sleeved on the connecting section and abuts against the second baffle and the third step.

6. The split-type magnetically connected expander according to any one of claims 1-5, characterized in that, The isolation component includes a universal interface, which includes a universal flange that is detachably connected to a docking flange on the energy recovery device.

7. The split-type magnetically connected expander according to claim 6, characterized in that, The isolation component includes a first plate disposed between the first magnetic coupling disk and the second magnetic coupling disk, the first plate being connected to the universal interface; The end faces of the first magnetic connecting disk and the second magnetic connecting disk are both parallel to the first flat plate.

8. The split-type magnetically connected expander according to claim 6, characterized in that, The isolation component includes a second plate disposed between the first magnetic coupling disk and the second magnetic coupling disk, the second plate being connected to the universal interface; Of the end faces of the first magnetic connecting disk and the second magnetic connecting disk, one is perpendicular to the second plate, and the other is parallel to the second plate.

9. The split-type magnetically connected expander according to claim 8, characterized in that, The outer edge of the first magnetic connecting disk is provided with magnetic material, and the straight-line distance between the outer edge of the first magnetic connecting disk and the center can be adjusted.

10. The split-type magnetically connected expander according to claim 6, characterized in that, The isolation component includes a folding plate disposed between the first magnetic connecting plate and the second magnetic connecting plate. The folding plate is connected to the universal interface. The folding plate includes a first sub-plate, a second sub-plate, and a third sub-plate that are vertically connected in sequence. The first sub-plate and the third sub-plate are arranged parallel to each other and define an isolation cavity with the second sub-plate. The end face of the second magnetic connecting plate has a receiving cavity, the folding plate is located in the receiving cavity, the first magnetic connecting plate is located in the isolation cavity, the end face of the first magnetic connecting plate and the bottom face of the receiving cavity are respectively located on both sides of the second dividing plate along the first direction and are parallel to the first dividing plate.

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