Vacuum liquid cooling system for energy storage flywheel rotor

Abstract

An energy storage flywheel rotor vacuum liquid cooling system comprises a flywheel stator, and a motor stator is fixed to the lower half portion of the flywheel stator. A flywheel rotor is arranged in the flywheel stator, a motor rotor is arranged on the lower portion of the flywheel rotor, and a rotor inner hole is formed in the motor rotor. A flow guide pipe is installed at the bottom of the flywheel rotor. A spray pipe assembly and an oil tank are fixed to the bottom of the flywheel stator. A nozzle is mounted at the top of the spray pipe assembly, the spray pipe assembly extends into the rotor inner hole, and the spray pipe assembly is not in contact with the flywheel rotor and the flow guide pipe; the side face and the bottom face of the oil tank are respectively provided with a cooling liquid inlet and outlet which are sequentially connected with the magnetic drive pump or the diaphragm pump and the heat exchanger through hoses. Cooling liquid in the oil tank is driven by the magnetic drive pump or the diaphragm pump to flow through the heat exchanger and then enter the spray pipe assembly through the hose, and the spray pipe assembly sprays the cooling liquid into an inner hole of the flywheel rotor to achieve cooling of the flywheel rotor.

Description

TECHNICAL FIELD

[0001] The utility model relates to flywheel energy storage system's cooling device technical field, concretely is a flywheel energy storage motor rotor cooling device. BACKGROUND

[0002] Flywheel energy storage system operates under the special condition of high vacuum, the heat of motor rotor cannot be dissipated by air medium convection, and the motor rotor rotates at high speed in the working state, therefore, the heat dissipation of motor rotor can only rely on the radiation of rotor itself or other special ways.

[0003] The key point of the technical scheme of cooling rotor with cooling liquid is that the dynamic seal between rotor and stator needs to meet the vacuum sealing requirement, which is mainly divided into the following two cases.

[0004] Case ①: if the cooling liquid works in a vacuum environment, what is the power source of the cooling liquid flow, if it is a general centrifugal pump, the pump is placed in a normal pressure environment, the impeller is in a vacuum environment, and the structure cannot meet the vacuum sealing requirement between the rotor and the stator of the pump. Although the pump is placed in the vacuum environment, the heat dissipation requirement of the pump cannot be guaranteed because the pump is generally air-cooled or forced air-cooled.

[0005] Case ②: if the cooling liquid works under normal pressure, the inner hole of flywheel rotor is under normal pressure, and the flywheel stator and flywheel rotor are in a vacuum environment, which requires that the inner hole of flywheel rotor and flywheel stator meet the vacuum sealing requirement.

[0006] In view of the above difficulties of liquid cooling, some Chinese public authorized inventions have disclosed some solutions.

[0007] It is known that the Chinese public authorized invention (publication number: CN 115065200 A) discloses a liquid-cooled energy storage flywheel and energy storage equipment with an internal vacuum environment, the liquid cooling scheme disclosed in the invention is that the cooling liquid works in a vacuum environment, the volume of the external oil tank is controlled to control the liquid level of the cooling liquid in the vacuum chamber, and the cooling liquid is pumped and circulated through the threads of the rotor inner hole and the rotation of the rotor itself;

[0008] It is known that the Chinese public authorized invention (publication number: CN 211429027 U) discloses a flywheel energy storage motor rotor cooling device, the cooling structure of the invention is similar to that of the present invention, but the structure scheme in the 4th, 5th and 6th clauses of the claim of the invention is different from that of the present invention (4th, the inside of the oil tank is fixedly connected with a heat exchanger assembly and a heat exchange pipeline; 5th, the top of the pump is fixedly connected with a pump assembly, and the pump assembly is fixedly connected with the oil tank; 6th, the top and bottom of the heat exchanger are fixedly connected with external connecting pipes), and the patent does not explain or describe the difficulties of liquid cooling;

[0009] It is known that the Chinese public authorization invention (publication number: CN 211429132 U) discloses a flywheel energy storage rotor high-speed rotating sealing and cooling device, wherein the cooling device uses a double-channel high-speed rotating joint to fix the working environment of the cooling liquid as a normal pressure environment, and is a solution to the sealing problem between the stator and the rotor through the high-speed rotating joint.

[0010] It is known that the Chinese public authorization invention (publication number: CN 211429136 U) discloses a flywheel energy storage rotor magnetic fluid sealing and cooling device, wherein the cooling device uses magnetic fluid sealing to fix the working environment of the cooling liquid as a normal pressure environment, and is a solution to the sealing problem between the stator and the rotor through the magnetic fluid sealing.

[0011] It is known that the Chinese public authorization invention (publication number: CN 211649058 U) discloses a flywheel energy storage rotor lip seal and cooling device, wherein the cooling device uses a lip seal to fix the working environment of the cooling liquid as a normal pressure environment, and is a solution to the sealing problem between the stator and the rotor through the lip seal. SUMMARY

[0012] The utility model discloses a kind of energy storage flywheel rotor vacuum liquid cooling systems, to solve the problem of difficult heat dissipation of high-speed rotating rotor under vacuum environment, and different from the patent scheme mentioned in the above background technology.

[0013] The utility model discloses a kind of energy storage flywheel rotor vacuum liquid cooling systems, including flywheel stator, it is characterized by: the flywheel stator inside is provided with flywheel rotor, the lower half of the flywheel stator is fixed with motor stator, the lower portion of the flywheel rotor is provided with motor rotor, the inside of the motor rotor is provided with rotor inner hole and rotor inner hole hole bottom height is higher than motor rotor, the bottom of the flywheel rotor is installed with flow guide pipe, the bottom of the flywheel stator is fixed with spray pipe assembly and oil tank and the spray pipe assembly is located inside oil tank, the top of the spray pipe assembly is installed with nozzle, the spray pipe assembly is inserted into the inside of rotor inner hole and there is no contact between spray pipe assembly and flywheel rotor, between spray pipe assembly and flow guide pipe, the side and bottom of the oil tank are provided with cooling liquid inlet and outlet respectively and inlet and outlet are sequentially connected with magnetic pump (or diaphragm pump) and heat exchanger hose, the cooling liquid inlet of the side of the oil tank is also connected with hose at the bottom of spray pipe assembly, the heat exchanger and magnetic pump (or diaphragm pump) are all set in the outside of flywheel stator.

[0014] Preferably, the inside of the motor rotor is provided with a rotor inner hole, and the bottom of the rotor inner hole is higher than the motor rotor.

[0015] Preferably, the bottom of the flywheel stator is fixed with a nozzle assembly and an oil tank, and the nozzle assembly is located inside the oil tank.

[0016] Preferably, the top of the nozzle assembly is provided with a nozzle.

[0017] Preferably, the nozzle assembly extends into the inside of the rotor inner hole, and there is no contact between the nozzle assembly and the flywheel rotor, and between the nozzle assembly and the flow guide pipe.

[0018] Preferably, the side and bottom of the oil tank are respectively provided with cooling liquid inlets and outlets, and the inlets and outlets are sequentially connected with a magnetic pump (or a diaphragm pump) and a heat exchanger hose, and the cooling liquid inlet of the side of the oil tank is further connected with a hose at the bottom of the nozzle assembly.

[0019] Preferably, the heat exchanger and the magnetic pump (or the diaphragm pump) are arranged outside the flywheel stator.

[0020] Preferably, the magnetic pump (or the diaphragm pump) is used as the power source of the cooling liquid.

[0021] The advantages of the flywheel rotor vacuum liquid cooling system are as follows:

[0022] 1. The flywheel rotor vacuum liquid cooling system of the utility model, through the magnetic pump (or the diaphragm pump), the cooling liquid in the oil tank at the bottom of the flywheel stator is pumped out, flows through the heat exchanger and the oil tank side wall and is then pumped into the bottom of the nozzle assembly, and then is sprayed into the rotor inner hole through the top nozzle of the nozzle assembly. When the cooling liquid flows down along the rotor inner hole wall under the action of gravity, the heat of the flywheel rotor is taken away, and the cooling liquid returns to the oil tank at the bottom of the flywheel stator through the flow guide pipe. In the circulation process, the heat of the flywheel rotor is transmitted to the outside of the system through the radiator.

[0023] 2. The flywheel rotor vacuum liquid cooling system of the utility model, the heat exchanger and the magnetic pump (or the diaphragm pump) are arranged outside the flywheel stator, so that installation and maintenance are facilitated.

[0024] 3. The flywheel rotor vacuum liquid cooling system of the utility model, the nozzle assembly extends into the inside of the rotor inner hole, and there is no contact between the nozzle assembly and the flywheel rotor and between the nozzle assembly and the flow guide pipe, so that the height requirement of the cooling liquid sprayed by the nozzle can be reduced, and the problem that the cooling liquid cannot be sprayed to the top of the rotor inner hole under the condition of large flow and affects the heat dissipation efficiency can be avoided.

[0025] 4. The flywheel rotor vacuum liquid cooling system of the utility model, through the use of the magnetic pump (or the diaphragm pump) as the circulation mode of the cooling liquid, the dynamic sealing problem between the rotor and the stator is simplified to a static sealing problem. Compared with dynamic sealing, static sealing can meet the vacuum sealing requirement at low cost and low difficulty.

[0026] 5. The flywheel rotor vacuum liquid cooling system can control the switch and refrigerating capacity of liquid cooling by controlling the flow of the magnetic pump (or diaphragm pump). BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic view of the utility model;

[0028] Figure 2 is a cooling liquid flow channel structural schematic view of the utility model;

[0029] Figure 3 is a nozzle assembly structural schematic view of the utility model;

[0030] In the drawing: 1 flywheel stator, 2 flywheel rotor, 3 motor stator, 4 motor rotor, 5 rotor inner hole, 501 cooling liquid downflow channel, 6 nozzle, 7 nozzle assembly, 701 cooling liquid upflow channel, 702 nozzle assembly inlet, 703 nozzle assembly outlet, 704 nozzle, 705 mounting frame, 8 flow guide pipe, 9 oil tank, 10 heat exchanger, 11 magnetic pump (or diaphragm pump). DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0032] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0033] As Figure 1As shown, the utility model provides a technical scheme: a kind of energy storage flywheel rotor vacuum liquid cooling system, including flywheel stator (1), flywheel rotor (2), motor stator (3), motor rotor (4), rotor inner hole (5), nozzle (6), nozzle assembly (7), flow guide pipe (8), oil tank (9), heat exchanger (10), magnetic pump (or diaphragm pump) (11), flywheel stator (1) is provided with flywheel rotor (2) inside, the lower half of flywheel stator (1) is fixed with motor stator (3), the lower part of flywheel rotor (2) is provided with motor rotor (4), the inside of motor rotor (4) is provided with rotor inner hole (5) and rotor inner hole (5) hole bottom height is higher than motor rotor (4), the bottom of flywheel rotor (2) is equipped with flow guide pipe (8), the bottom of flywheel stator (1) is fixed with nozzle assembly (7) and oil tank (9) and nozzle assembly (7) is located inside oil tank (9), nozzle assembly (7) top is equipped with nozzle (6), nozzle assembly (7) extends into rotor inner hole (5) inside and nozzle assembly (7) and flywheel rotor (2), nozzle assembly (7) and flow guide pipe (8) are all without contact between, the side and bottom of oil tank (9) are provided with the inlet and outlet of cooling liquid and inlet and outlet are sequentially connected with magnetic pump (or diaphragm pump) (11) and heat exchanger (10) with hose, the cooling liquid inlet of oil tank (9) side is also connected with the hose of nozzle assembly (7) bottom, heat exchanger (10) and magnetic pump (or diaphragm pump) (11) are all arranged in flywheel stator (1) outside.

[0034] As Figure 3 As shown, nozzle assembly (7) is welded by nozzle (704) and mounting bracket (705).

[0035] As Figures 1-2 As shown, cooling liquid enters cooling liquid upflow channel (701) from nozzle assembly inlet (702), is sprayed into rotor inner hole (5) after passing through nozzle (6) installed at nozzle assembly outlet (703), and cooling liquid flows downward along the hole wall of rotor inner hole (5) under the action of gravity and carries away the heat of flywheel rotor (2). The cooling liquid heated by flywheel rotor (2) enters oil tank (9) at the bottom of flywheel stator (1) after passing through cooling liquid downflow channel (501) formed by the outer wall of nozzle assembly (7), rotor inner hole (5) and flow guide pipe (8). The cooling liquid in oil tank (9) is pumped out from the bottom of oil tank (9) under the action of magnetic pump (or diaphragm pump) (11), enters heat exchanger (10) after flowing through magnetic pump (or diaphragm pump) (11), and exchanges heat in heat exchanger (10). After heat exchange, the cooled cooling liquid continues to flow under the action of magnetic pump (or diaphragm pump) (11), flows into nozzle assembly inlet (702) through the interface of oil tank (9) side wall, and completes the cycle. In this cycle process, the heat of flywheel rotor (2) is discharged to the outside of the system through the cooling liquid via heat exchanger (10).

[0036] Optionally, the heat exchanger (10) can adopt natural air cooling or forced water cooling for heat exchange, and the plate heat exchanger shown in the drawing has two passages of closed circulation and open circulation, and the drawing is not used for limiting the utility model.

[0037] Optionally, in the pipeline through which the cooling liquid flows, devices such as but not limited to a filter, a sensor, a controller, a liquid supplementing port, a discharge port and the like can be added.

[0038] The above only describes the preferred embodiments of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An energy storage flywheel rotor vacuum liquid cooling system comprising a flywheel stator (1) characterised in that: The flywheel stator (1) is internally provided with a flywheel rotor (2), the lower half of the flywheel stator (1) is fixed with a motor stator (3), the lower part of the flywheel rotor (2) is provided with a motor rotor (4), the inside of the motor rotor (4) is provided with a rotor inner hole (5) and the hole bottom height of the rotor inner hole (5) is higher than the motor rotor (4), the bottom of the flywheel rotor (2) is installed with a flow guide pipe (8), the bottom of the flywheel stator (1) is fixed with a nozzle assembly (7) and an oil tank (9) and the nozzle assembly (7) is located inside the oil tank (9), the top of the nozzle assembly (7) is installed with a nozzle (6), the nozzle assembly (7) extends into the inside of the rotor inner hole (5) and there is no contact between the nozzle assembly (7) and the flywheel rotor (2), the nozzle assembly (7) and the flow guide pipe (8), the side and bottom of the oil tank (9) are respectively provided with the inlet and outlet of the cooling liquid and the inlet and outlet are connected with the soft tube of the magnetic pump or diaphragm pump (11) and heat exchanger (10) in turn, the cooling liquid inlet of the side of the oil tank (9) is also connected with the soft tube of the bottom of the nozzle assembly (7), the heat exchanger (10) and the magnetic pump or diaphragm pump (11) are all arranged outside the flywheel stator (1).

2. A vacuum liquid cooling system for an energy storage flywheel rotor as claimed in claim 1, wherein, The magnetic pump or diaphragm pump (11) is used as the power source of the cooling liquid.

Images