Magnetic suspension centrifugal machine with internal cooling structure

Abstract

According to the magnetic suspension centrifugal machine with the inner cooling structure, a heat exchange ring is additionally arranged on the basis of the prior art to be attached to a stator, so that heat dissipation of the stator is achieved, heat generated by the stator is transmitted to the heat exchange ring, and the heat exchange ring is used for cooling the stator. Cooling liquid in the expansion type radiator enters the heat exchange ring and then is pumped back to the interior of the expansion type radiator through the infusion pump, so that the cooling liquid can circularly flow in the heat exchange ring, heat dissipation of the stator is achieved, meanwhile, a semiconductor chilling plate in the heat exchange expansion bag begins to refrigerate to dissipate heat of the cooling liquid, and heat dissipation of the stator is achieved. When the temperature of the cooling liquid rises, the inflation and deflation pump inflates the interior of the heat exchange expansion bag to enable the heat exchange expansion bag to expand and become large, so that the heat exchange area is increased, and when the temperature of the cooling liquid further rises, the expansion belt expands and becomes large, so that the space of the heat exchange ring is compressed to effectively accelerate the circulation speed of the cooling liquid. Therefore, the heat dissipation effect is further effectively improved.

Description

Technical Field

[0001] The invention relates to a magnetic suspension centrifuge with an inner cooling structure, in particular to a magnetic suspension centrifuge with an inner cooling structure applied in the field of centrifuges. Background Art

[0002] The magnetic centrifuge uses magnetic bearings to support and drive the rotor of the centrifugal compressor. The magnetic bearings consist of radial bearings and axial bearings composed of permanent magnets and electromagnets. These bearings can suspend the moving parts on the magnetic lining to achieve frictionless movement. Although the bearings are magnetically suspended for frictionless movement, the stator will also generate heat due to losses.

[0003] In order to solve the problem of heat dissipation, a certain magnetic levitation centrifuge in the market adopts a design that adds a heat dissipation structure and has a certain market share.

[0004] The specification of Chinese patent CN202322681205.8 discloses a magnetic levitation centrifugal unit, which includes a condenser, an evaporator, a compressor, and an electrical cabinet. The condenser and the evaporator are respectively fixed by a frame and the frame is respectively installed at the two ends of the condenser and the evaporator. One end of the condenser is connected to a cold water pipe, and one end of the evaporator is connected to a hot water pipe. The compressor is installed on the upper end of the condenser through a support frame, one end of the compressor is connected to a radiator, one end of the compressor is also connected to a second pipe, one end of the second pipe is connected to the condenser, and a heat dissipation component is also connected to the frame through a protective box; an air cooler is installed through the protective box, and the edge of the protective box is opened to provide good ventilation and heat exchange effects. The air cooler installed on the inside can generate cold air to dissipate heat for the condenser, evaporator and other units when working, to ensure their normal operation without thermal failure.

[0005] Although the above patent dissipates heat for the unit by adding a heat dissipation component, the heat dissipation effect is limited, and the unit can only be cooled externally, and the internal stator cannot be cooled well. Summary of the invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is to dissipate heat from the stator.

[0007] To solve the above problems, the present invention provides a magnetic levitation centrifuge with an internal cooling structure, comprising a magnetic levitation centrifuge body, the magnetic levitation centrifuge body comprising a rotor suspended in the middle and a stator on a side wall, a heat exchange ring attached to the stator fixedly inlaid on the inner wall of the magnetic levitation centrifuge body, an expansion radiator fixedly connected to the upper end side wall of the magnetic levitation centrifuge body, and the interiors of the heat exchange ring and the expansion radiator are both filled with cooling liquid, a liquid pump is installed on the upper end inner wall of the expansion radiator, and the lower end of the liquid pump is connected to a liquid inlet pipe, the liquid inlet pipe penetrates the inner wall of the magnetic levitation centrifuge body and extends to the interior of the heat exchange ring, the lower end side wall of the expansion radiator away from the liquid inlet pipe is connected to a liquid outlet pipe connected to the interior of the heat exchange ring, a heat exchange expansion bag is fixedly connected to the inner wall of the middle part of the upper end of the expansion radiator, a charging and discharging air pump is installed on the upper end side wall of the expansion radiator, and the lower end of the charging and discharging air pump is connected to an air pipe penetrating into the interior of the heat exchange expansion bag, and a plurality of semiconductor refrigeration sheets distributed around the inner wall of the heat exchange expansion bag are fixedly connected.

[0008] In the above-mentioned magnetic levitation centrifuge with an internal cooling structure, heat is dissipated from the stator by adding a heat exchange ring inside the magnetic levitation centrifuge body, thereby effectively improving the operating stability of the magnetic levitation centrifuge body.

[0009] As a further improvement of the present application, the heat exchange expansion bladder includes multiple expansion bodies and shaping bodies, and each shaping body corresponds to a semiconductor refrigeration chip. When the charging and discharging air pump inflates the interior of the heat exchange expansion bladder through the air pipe, the heat exchange expansion bladder expands and becomes larger, thereby increasing the contact area with the coolant, thereby effectively improving the heat dissipation effect. In the process of the heat exchange expansion bladder expanding and becoming larger, the expansion body mainly plays an expansion role, and the shaping body is used to install the semiconductor refrigeration chip. The shaping body does not participate in the expansion of the expansion body, which can effectively improve the stability of the heat exchange expansion bladder during expansion.

[0010] As a further improvement of the present application, the expansion body is made of elastic heat-conducting material, and the shaping body is made of hard material. Although the expansion body plays the role of expanding and becoming larger, it must also be able to absorb the heat of the coolant and exchange heat with the cold generated by the internal semiconductor refrigeration chip. Therefore, the expansion body must be able to conduct heat, and the shaping body plays the role of stabilizing the semiconductor refrigeration chip. Therefore, the shaping body is made of hard material.

[0011] As a further improvement of the present application, a plurality of expansion belts are fixedly connected to the inner wall of the heat exchange ring, and the plurality of expansion belts are evenly spaced and distributed around the outer circumferential inner wall of the heat exchange ring. When the heat of the stator is too large, in order to adaptively improve the heat dissipation effect, the deformation characteristic of the expansion belt after reaching a certain temperature is utilized to compress the space inside the heat exchange ring. This can effectively speed up the circulation flow speed of the coolant inside the heat exchange ring, thereby effectively improving the heat dissipation effect.

[0012] As another improvement of the present application, the expansion belt includes two inner and outer elastic pads, and a flexible connecting membrane is fixedly connected between the sides of the two elastic pads, and a plurality of symmetrically distributed shape memory alloy rods are also fixedly connected between the two elastic pads. When the heat of the coolant rises abnormally, the heat of the coolant is transferred to the shape memory alloy rod through the elastic pad. The shape memory alloy rod begins to deform after reaching the phase change temperature, and the shape memory alloy rod deforms from a bent state to a straight state. At this time, the outer elastic pad will be pushed outward, thereby causing the expansion belt to expand and become larger, thereby compressing the internal space of the heat exchange ring, and part of the coolant inside the heat exchange ring is pushed into the expansion radiator, thereby effectively accelerating the circulation speed of the coolant inside the heat exchange ring. Although the amount of coolant involved is reduced, the amount of coolant extracted from the inside of the heat exchange ring by the liquid extraction pump has not decreased, which means that the speed at which the coolant circulates inside the heat exchange ring is accelerated, and the heat dissipation effect can still be effectively improved.

[0013] As another improvement of the present application, the filling amount of the coolant in the expansion radiator is 60%-80%, and the inner wall of the lower end of the expansion radiator located above the liquid outlet pipe is provided with a recess. In order to leave a margin for the reverse outflow of the coolant in the heat exchange ring when the expansion belt expands, sufficient space must be left for the filling amount of the coolant in the expansion radiator. The design of the recess at the bottom of the expansion radiator is to allow the coolant to automatically flow into the heat exchange ring under the action of gravity to participate in the circulation.

[0014] As another improvement of the present application, a temperature detector extending into the coolant is also installed on the inner wall of the upper end of the expansion radiator. The liquid pump also includes a flow regulating module, and the temperature detector is electrically connected to the flow regulating module through a control processor. The temperature detector is used to monitor the temperature of the coolant. When the temperature reaches the set value, the temperature detector immediately triggers the flow regulating module to increase the flow of the liquid pump. In this way, the liquid pump can cooperate with the expansion effect of the expansion belt to further effectively increase the circulation flow speed of the coolant in the heat exchange loop, thereby further effectively improving the heat dissipation effect.

[0015] To summarize, by adding a heat exchange ring on the basis of the existing technology to fit the stator, the heat dissipation of the stator is achieved, the heat generated by the stator is transferred to the heat exchange ring, and the coolant inside the expansion radiator enters the heat exchange ring and is then pumped back to the expansion radiator by the liquid pump, so that the coolant can circulate inside the heat exchange ring to take away the heat, thereby achieving the heat dissipation of the stator. At the same time, the semiconductor refrigeration plate inside the heat exchange expansion bag starts to cool and dissipate the coolant, so that the coolant maintains an efficient heat dissipation effect. When the temperature of the coolant rises, the charging and dissipating air pump inflates the heat exchange expansion bag to make it expand and enlarge, thereby increasing the heat exchange area and effectively improving the heat dissipation effect. When the coolant temperature further increases, the expansion belt expands and enlarges, thereby compressing the heat exchange ring space to effectively speed up the circulation speed of the coolant, thereby further effectively improving the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional diagram of a magnetic levitation centrifuge according to a first embodiment of the present application; Figure 2 This is a three-dimensional cross-sectional view of a magnetic levitation centrifuge according to a first embodiment of the present application; Figure 3 A connection diagram of a heat exchange ring and an expansion radiator according to a first embodiment of the present application; Figure 4 A side cross-sectional view of the heat exchange expansion bladder of the first embodiment of the present application before expansion; Figure 5 A side cross-sectional view of the heat exchange expansion bladder after expansion according to the first embodiment of the present application; Figure 6 for Figure 4 The enlarged view of point A in the middle; Figure 7 for Figure 5 The enlarged view of point B in the middle; Figure 8 This is a cross-sectional view of the expansion belt before expansion according to the second embodiment of the present application; Fig. 9 This is a cross-sectional view of the expansion belt after expansion according to the second embodiment of the present application.

[0017] Description of the numbers in the figure: 1. Magnetic levitation centrifuge body, 2. rotor, 3. stator, 4. heat exchange ring, 5. expansion radiator, 6. liquid pump, 7. liquid inlet pipe, 8. liquid outlet pipe, 9. heat exchange expansion bag, 901. expansion body, 902. shaping body, 10. air pipe, 11. charging and discharging air pump, 12. semiconductor refrigeration sheet, 13. expansion belt, 1301. elastic pad, 1302. flexible connecting membrane, 1303. shape memory alloy rod, 14. temperature detector. DETAILED DESCRIPTION

[0018] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0019] The first implementation method: Figure 1 , 2 , 3 and Figure 4 As shown, it includes a magnetic levitation centrifuge body 1, which includes a rotor 2 suspended in the middle and a stator 3 on the side wall. A heat exchange ring 4 attached to the stator 3 is fixedly inlaid on the inner wall of the magnetic levitation centrifuge body 1, and an expansion radiator 5 is fixedly connected to the upper side wall of the magnetic levitation centrifuge body 1. The heat exchange ring 4 and the expansion radiator 5 are filled with coolant (cooling oil is preferably used, and other coolants can also be rotated according to actual needs). The filling amount of the coolant in the expansion radiator 5 is 60%-80%, and the inner wall of the lower end of the expansion radiator 5 located above the liquid outlet pipe 8 is notched, so that when the expansion zone 13 expands and becomes larger A margin is left for the reverse outflow of the coolant in the heat exchange ring 4, so sufficient space should be left for the filling amount of the coolant in the expansion radiator 5, and the design of the recess at the bottom of the expansion radiator 5 is to allow the coolant to automatically flow into the heat exchange ring 4 under the action of gravity to participate in the circulation. A liquid extraction pump 6 is installed on the upper inner wall of the expansion radiator 5 (the specific model is selected according to actual needs and is not described in detail here). A temperature detector 14 extending into the coolant is also installed on the upper inner wall of the expansion radiator 5 (the specific model is selected according to actual needs and is not described in detail here). The liquid extraction pump 6 also includes a flow regulating module, and the temperature detector 14 controls the flow of the coolant. The control processor is electrically connected to the flow regulating module (the specific connection relationship and control principle are well-known technologies for technicians in the relevant field and will not be described in detail here). The temperature detector 14 is used to monitor the temperature of the coolant. When the temperature reaches the set value, the temperature detector 14 immediately triggers the flow regulating module to increase the flow of the liquid pump 6. In this way, the liquid pump 6 can cooperate with the expansion effect of the expansion belt 13 to further effectively increase the circulation flow speed of the coolant in the heat exchange ring 4, thereby further effectively improving the heat dissipation effect. The lower end of the liquid pump 6 is connected to a liquid inlet pipe 7, which passes through the inner wall of the magnetic suspension centrifuge body 1 and extends to the interior of the heat exchange ring 4. The expansion radiator A liquid outlet pipe 8 communicating with the inside of the heat exchange ring 4 is connected to the side wall of the lower end away from the liquid inlet pipe 7, a heat exchange expansion bag 9 is fixedly connected to the inner wall of the middle part of the upper end of the expansion type radiator 5, a charging and discharging air pump 11 (the specific model is selected according to actual needs and will not be described in detail here) is installed on the upper end side wall of the expansion type radiator 5, and the lower end of the charging and discharging air pump 11 is connected to an air pipe 10 penetrating into the inside of the heat exchange expansion bag 9, and a plurality of semiconductor refrigeration sheets 12 distributed around the inner wall of the heat exchange expansion bag 9 are fixedly connected (the specific connection structure and working principle are well-known technologies for technicians in the relevant fields, and the specific model is selected according to actual needs and will not be described in detail here).

[0020] The second implementation method: Figure 4 , 5 , 6 and Figure 7 As shown, the heat exchange expansion bag 9 includes multiple expansion bodies 901 and shaping bodies 902, and each shaping body 902 corresponds to a semiconductor cooling sheet 12. When the charging and discharging air pump 11 inflates the heat exchange expansion bag 9 through the air pipe 10, the heat exchange expansion bag 9 expands and becomes larger, thereby increasing the contact area with the coolant, thereby effectively improving the heat dissipation effect. In the process of the heat exchange expansion bag 9 expanding and becoming larger, the expansion body 901 mainly plays an expansion role, and the shaping body 902 is used to install the semiconductor cooling sheet 12. The shaping body 902 does not participate in the expansion of the expansion body 901, which can effectively improve the heat exchange In order to improve the stability of the expansion bag 9 during expansion, the expansion body 901 is made of elastic thermal conductive material (polyurethane elastic material is preferred, and other materials can also be selected according to actual needs), and the shaping body 902 is made of hard material, preferably plastic material, and other materials can also be selected according to actual needs). Although the expansion body 901 plays the role of expanding and enlarging, it must also be able to absorb the heat of the coolant and exchange heat with the cold generated by the internal semiconductor cooling sheet 12. Therefore, the expansion body 901 must be able to conduct heat, and the shaping body 902 plays the role of stabilizing the semiconductor cooling sheet 12, so the shaping body 902 is made of hard material; Figure 8 , 9As shown, a plurality of expansion belts 13 are fixedly connected to the inner wall of the heat exchange ring 4, and the plurality of expansion belts 13 are evenly spaced and distributed around the outer circumferential inner wall of the heat exchange ring 4. When the heat of the stator is too large, in order to adaptively improve the heat dissipation effect, the deformation characteristic of the expansion belt 13 after reaching a certain temperature is used to compress the space inside the heat exchange ring 4, which can effectively accelerate the circulation flow speed of the coolant inside the heat exchange ring 4, thereby effectively improving the heat dissipation effect. The expansion belt 13 includes two inner and outer elastic pads 1301, and a flexible connecting membrane 1302 is fixedly connected between the sides of the two elastic pads 1301, and a plurality of symmetrically distributed shape memory alloy rods 1303 are also fixedly connected between the two elastic pads 1301 (the phase change temperature of deformation and recovery of deformation is selected according to actual needs, and will not be described in detail here). Description), when the heat of the coolant rises abnormally, the heat of the coolant is transferred to the shape memory alloy rod 1303 through the elastic pad 1301. The shape memory alloy rod 1303 begins to deform after reaching the phase change temperature. The shape memory alloy rod 1303 is deformed from a bent state to a straight state. At this time, the outer elastic pad 1301 will be pushed outward, thereby causing the expansion belt 13 to expand and become larger, thereby compressing the internal space of the heat exchange ring 4. Part of the coolant inside the heat exchange ring 4 is pushed into the expansion radiator 5, thereby effectively accelerating the circulation speed of the coolant inside the heat exchange ring 4. Although the amount of coolant involved is reduced, the amount of coolant extracted from the heat exchange ring 4 by the liquid pump 6 is not reduced, which means that the speed of the coolant circulating in the heat exchange ring 4 is accelerated, which can still effectively improve the heat dissipation effect.

[0021] The working principle of this scheme is: when dissipating heat, the liquid pump 6 draws the coolant inside the heat exchange ring 4 back to the expansion radiator 5, and then the coolant returns to the inside of the heat exchange ring 4 through the liquid outlet pipe 8, so as to realize the circulation flow in the heat exchange ring 4, so that the coolant can take away the heat transferred from the stator to the heat exchange ring 4, thereby realizing the heat dissipation of the stator. When the coolant is inside the expansion radiator 5, the semiconductor refrigeration plate 12 cools the coolant to cool it. When the temperature of the coolant rises, the charging and discharging air pump 11 inflates the heat exchange expansion bag 9 through the air pipe 10, and the heat exchange expansion bag 9 expands and becomes larger, thereby increasing the contact area with the coolant, thereby effectively improving the heat dissipation effect. When the temperature of the coolant further rises, the heat of the coolant The heat is transmitted to the shape memory alloy rod 1303 through the elastic pad 1301. After the shape memory alloy rod 1303 reaches the phase change temperature, it begins to deform. The shape memory alloy rod 1303 deforms from a bent state to a straight state. At this time, the outer elastic pad 1301 will be pushed outward, thereby causing the expansion belt 13 to expand and become larger, thereby compressing the internal space of the heat exchange ring 4. Part of the coolant inside the heat exchange ring 4 is pushed into the expansion radiator 5, thereby effectively accelerating the circulation speed of the coolant inside the heat exchange ring 4. Although the amount of coolant involved is reduced, the amount of coolant extracted from the heat exchange ring 4 by the liquid pump 6 is not reduced, which means that the speed of the coolant circulating in the heat exchange ring 4 is accelerated, which can still effectively improve the heat dissipation effect.

[0022] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A magnetic suspension centrifuge with an internal cooling structure, characterized in that: The invention comprises a magnetic levitation centrifuge body (1), wherein the magnetic levitation centrifuge body (1) comprises a rotor (2) suspended in the middle and a stator (3) located on a side wall, wherein a heat exchange ring (4) in contact with the stator (3) is fixedly inlaid on the inner wall of the magnetic levitation centrifuge body (1), an expansion radiator (5) is fixedly connected to the upper side wall of the magnetic levitation centrifuge body (1), and the insides of the heat exchange ring (4) and the expansion radiator (5) are both filled with cooling liquid, a liquid pump (6) is installed on the inner wall of the upper end of the expansion radiator (5), and the lower end of the liquid pump (6) is connected to a liquid inlet pipe (7), and the liquid inlet pipe (7) passes through the magnetic levitation centrifuge body (1). The inner wall of the suspension centrifuge body (1) extends to the interior of the heat exchange ring (4); the lower end side wall of the expansion radiator (5) away from the liquid inlet pipe (7) is connected to a liquid outlet pipe (8) communicating with the interior of the heat exchange ring (4); the upper middle inner wall of the expansion radiator (5) is fixedly connected to a heat exchange expansion bag (9); the upper end side wall of the expansion radiator (5) is installed with a charging and discharging air pump (11), and the lower end of the charging and discharging air pump (11) is connected to an air pipe (10) penetrating into the interior of the heat exchange expansion bag (9); the inner wall of the heat exchange expansion bag (9) is fixedly connected to a plurality of semiconductor cooling plates (12) distributed around it.

2. The magnetic suspension centrifuge with an internal cooling structure according to claim 1, characterized in that: The heat exchange expansion bag (9) comprises a plurality of expansion bodies (901) and shaping bodies (902), and each shaping body (902) corresponds to a semiconductor cooling plate (12).

3. The magnetic suspension centrifuge with an internal cooling structure according to claim 2, characterized in that: The expansion body (901) is made of an elastic thermal conductive material, and the shaping body (902) is made of a hard material.

4. The magnetic suspension centrifuge with an internal cooling structure according to claim 1, characterized in that: A plurality of expansion belts (13) are also fixedly connected to the inner wall of the heat exchange ring (4), and the plurality of expansion belts (13) are distributed around the outer circumferential inner wall of the heat exchange ring (4) at equal intervals.

5. The magnetic suspension centrifuge with an internal cooling structure according to claim 4, characterized in that: The expansion belt (13) comprises two inner and outer elastic pads (1301), and a flexible connection membrane (1302) is fixedly connected between the sides of the two elastic pads (1301), and a plurality of symmetrically distributed shape memory alloy rods (1303) are also fixedly connected between the two elastic pads (1301).

6. The magnetic suspension centrifuge with an internal cooling structure according to claim 1, characterized in that: The amount of coolant filled in the expansion radiator (5) is 60%-80%, and the inner wall of the lower end of the expansion radiator (5) located above the liquid outlet pipe (8) is provided with a recess.

7. The magnetic suspension centrifuge with an internal cooling structure according to claim 1, characterized in that: The inner wall of the upper end of the expansion radiator (5) is also equipped with a temperature detector (14) extending into the coolant. The liquid pump (6) also includes a flow regulating module, and the temperature detector (14) is electrically connected to the flow regulating module via a control processor.

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