Enclosed air cooler device for a rotational electrical machine

[0002] (a) Field of the Invention

[0003] An air cooler device for an enclosed rotational electrical machine includes an innovative cooling air flow circuit structure in which the high temperature air flow inside the enclosed rotational electrical machine is pumped to an outside cooler device and then pumped back into the enclosed rotational electrical machine.

[0004] (b) Description of the Prior Art

[0005] The conventional cooling methods for enclosed type electrical machines usually adopt the free air cooling (as shown in FIG. 1 and FIG. 2), i.e., one or more than one dissipating fins 101aare installed at the outside casing of the enclosed type rotational electrical machine 10ato dissipate the accumulated heat of the rotational electrical machine through the free air convection for cooling; or adopt the external air forced cooling method (as shown in FIG. 3), i.e., the enclosed type rotational electrical machine 10bis further installed with a fan 101bto blow the air for cooling; or adopt the liquid cooling method (as shown in FIG. 4), i.e., the rotational electrical machine 10cis cooled by the external coolant 101c. The disadvantage of the aforesaid cooling technology is that the enclosed type rotational electrical machine's internal heat flow cannot be pumped out directly but must rely on the enclosed type electrical machine's casing to dissipate the internally accumulated heat resulting in a higher temperature difference between the inside and outside. Therefore, the heat dissipation is not very effective, which affects the rotational electrical machine's performance very much.

[0006] The invention is an innovative design of an enclosed type air cooler device for a rotational electrical machine, in which the high temperature air flow inside the enclosed type rotational electrical machine is pumped out to an outside cooler device in an enclosed type flow circuit and is then pumped back to the enclosed type rotational electrical machine inside without jeopardizing the enclosed nature of the machine.

[0007] FIG. 1 is a diagram of the conventional free air cooling structure of the enclosed type electrical machines.

[0008] FIG. 2 is the side view of the conventional free cooling structure of the enclosed type electrical machines.

[0009] FIG. 3 is a diagram of a conventional forced air cooling structure of the enclosed type electrical machines.

[0010] FIG. 4 is a schematic diagram of a conventional liquid cooling structure of the enclosed type rotational electrical machines.

[0011] FIG. 5 is the longitudinal sectional view of the invention illustrating that the enclosed type rotational electrical machine and its cooler device are in an integrated structure.

[0012] FIG. 6 is the cross-sectional view of the invention illustrating an integrated structure of the enclosed type rotational electrical machine and its cooler device.

[0013] FIG. 7 is the longitudinal sectional view of the invention illustrating an integrated structure of the enclosed type rotational electrical machine and its cooler device with additional internally installed heat absorbing fins.

[0014] FIG. 8 is the cross-sectional diagram of the invention illustrating an integrated structure of the enclosed type rotational electrical machine and its cooler device.

[0015] FIG. 9 is a structural schematic diagram illustrating that the enclosed type rotational electrical machine and its cooler device are separated.

[0016] FIG. 10 is an embodying example schematic diagram of the centrifugal type radial fan of the invention.

[0017] FIG. 11 is a structural sectional view of the invention illustrating that the tubular shape enclosed type rotational electrical machine and its cooler device are respectively independent and combined together.

[0018] FIG. 12 is a structural side view of the invention illustrating that the tubular shape enclosed type rotational electrical machine and its cooler device are respectively independent and combined together.

[0019] FIG. 13 is an embodying example schematic diagram of the centrifugal type radial fan of the invention.

[0020] FIG. 14 is a structural sectional view of the invention illustrating that the air chamber type enclosed type rotational electrical machine and its cooler device are respectively independent and combined together.

[0021] FIG. 15 is a structural side view of the invention illustrating that the air chamber type enclosed type rotational electrical machine and its cooler device are respectively independent and combined together.

[0022] FIG. 16 is an embodying example schematic diagram of the centrifugal type radial fan of the invention.

[0023] FIG. 17 is a structural sectional view of the invention illustrating that the air chamber type enclosed type rotational electrical machine and its cooler device are respectively independent and separately installed.

[0024] FIG. 18 is an embodying example schematic diagram of the centrifugal type radial fan of the invention.

[0025] FIG. 19 is a structural schematic diagram of the invention illustrating that the enclosed type rotational electrical machine is combined with other mechanisms.

[0026] FIG. 20 is an embodying example schematic diagram of the centrifugal type radial fan of the invention.

[0027] FIG. 21 is a structural sectional schematic diagram of the invention illustrating an integrated structure of the enclosed type rotational electrical machine and other mechanisms.

[0028] FIG. 22 is an embodying example schematic diagram of the centrifugal type radial fan of the invention.

[0029] FIG. 23 is a schematic diagram of the invention illustrating that the cooler device is used as for heating source.

[0030] FIG. 24 is a schematic diagram of the invention illustrating a free heating cooler device structure.

[0031] FIG. 25 is a schematic diagram of the invention illustrating a controlled heating cooler structure.

[0032] FIG. 26 is a schematic diagram of the invention illustrating that the cooler device is installed with air pass tubes.

[0033] The enclosed type air cooler device of the preferred embodiment of the invention is mainly constituted by a rotational electrical machine and a cooler device, and includes the following.

[0034] A rotational electrical machine which is mainly referred to the rotational machines such as motors or generators, etc., whereof it is characterized that a air inlet and an air outlet are provided at its casing and through a fan simultaneously driven by the power output shaft of the rotational electrical machine, or an independently installed fan device or both of them installed simultaneously to pump the air or other selected gases inside the rotational electrical machine to allow the cooling air stream flow through the outlet to the enclosed type air cooler for indirect heat dissipation, then is pumped back to the rotational electrical machine;

[0035] A cooler device, whereof it and the rotational electrical machine casing appear individually independent structures and are further combined, or it and the rotational electrical machine appear in an integrated structure, or it and the casing of other peripheral mechanisms with cooling effects (such as the driving device casing or load casing) appear in an integrated structure; therein outside of the cooler device can be installed with heat dissipating fins for free air cooling or fanned air cooling or coolant cooling, whereof the cooler devices are constituted by tubular shape structures or other geometric shape structures, whereof its interior appears in tubular shape or air chamber type structures and the heat absorbing fins can be installed to absorb and transfer the heat energy for dissipation to the outside; wherein the internal air flow circuit or air chamber can be an empty space or can be installed with a air filter device or can be simultaneously installed with an clean cover or a clean plug for opening and closing to do cleaning and maintenance as well as removing the condensed moisture or internal eroded fragment powders such as the DC machine brush fragment powder.

[0036] FIGS. 5 and 6 show one of the embodying examples of the invention, whereof it is comprised of that an air outlet 112aand an air inlet 111aare provided at the front and rear end of the casing 11aof the said rotational electrical machine 1a, and an integrally installed air cooler device 2ais further installed at the outside of the casing 11a, and the rotational electrical machine 1ais enclosed by the casing 21aof the said cooler 2a, whereby the casing 21aof the cooler device 2aand the casing 11aof the rotational electrical machine 1aform a tubular space 22awhich is connected with the inlet 111aand the outlet 112a; further, a centrifugal type radial or axial fan 13ais installed on the power output shaft 12alocated at the outlet 112aside of the rotational electrical machine 1; wherein the casing 21aof the cooler device 2acan be installed with several heat dissipating fins 212awhich allow the cooler device 2ato match with a free air cooler device 3, or to match with a conventional forced air cooler device 4; in addition, a cooling circuit can be further provided inside the cooler device to match with a liquid cooler device 5 or to match with a heat exchanger device 6; furthermore, the axial heat dissipating fins 113a, 211aare installed at the outside of the casing 11aand at the inside of the casing 21ato improve the heat conduction in the tubular space 22a, whereof the air or other gases inside the tubular space 22abetween the rotational electrical machine 1athe cooler device 2aforms the cooling flow which constitutes the enclosed type air cooler device of the rotational electrical machine of the invention.

[0037] When the rotational electrical machine 1aproduces power, the centrifugal type radial or axial fan 13ais simultaneously driven to rotate by the said power output shaft 12ato pump the cooling gas contained heat from the outlet 112ato the tubular space 22aconstituted by the cooler device 2aand through the internally installed heat dissipating fins 111a, 211ato transfer heat energy as well as further through the cooler device 2ato match with a free air cooler device 3 or to match with a conventional forced air cooler device 4, besides, the internal cooling circuits can be further installed inside the cooler device to match with the other final cooler devices such as a liquid cooler device 5 or a heat exchanger 6, etc. thereby to produce heat dissipating function and the cooled down gas flow can be pumped back through the inlet 111ato the inside of the rotational electrical machine 1a, thus the accumulated heat inside the enclosed type rotational electrical machine casing can be effectively removed to improve the cooling effect.

[0038] Besides, as shown in FIGS. 7 and 8 of the invention, the tubular space 22abetween the said rotational electrical machine 1aand the cooler device 2ais installed with heat absorbing fins 221awhich causes the tubular space 22ato form a blended circuit shape, and through this to allow the said heat absorbing fins 221ato absorb the hot gas heat and transfer it to the outside thereby to improve the heat dissipating effect of the rotational electrical machine.

[0039] In addition, as shown in FIG. 9 of the invention, the rotational electrical machine 1band the cooler device 2bcan be further made in the separated structures, whereof the inlet 111band outlet 112bare provided at the casing 11bof the said rotational electrical machine 1b, whereof a centrifugal type radial or axial fan 13bis installed on the power output shaft 12bat the outlet 112bside (as shown in FIG. 10); whereof the said cooler device 2bforms a tubular circuit structure 22bwhich is not limited to a particular shape, besides of blended shape, it can be also formed to helical shape or other irregular shapes; whereof the said cooler device 2bcan be matched with a free air cooler device 3 or the cooler device 2acan be matched with a forced air cooler device 4, and cooling circuits can be further installed inside the cooler device to match with a liquid cooler device 5 or to match with a heat exchanger 6, or the cooler device 2bcan combine with several different cooling technologies to constitute in an integrated structure; through this, both ends of the tubular circuit structure 22bof the cooler device 2bare respectively connected to the inlet 111band outlet 112bof the said rotational electrical machine 1b, wherein the rotational electrical machine 1band the tubular circuit structure 22bof the cooler device 2bare filled in with air or other gases thereby to constitute the enclosed type air cooler device of the rotational electrical machine of the invention.

[0040] The effect of the aforesaid embodying example is that when the rotational electrical machine 1bproduces power, the centrifugal type radial or axial fan 13bis simultaneously driven by the power output shaft 12bto rotate whereby to pump the hot gas inside the rotational electrical machine 1bthrough the outlet 112bto the outside tubular circuit structure 22bconstituted by the cooler device 2b, whereof the cooler device 2bis matched with a free air cooler device 3 or matched with a conventional forced air cooler device 4, or the cooling circuit can be installed inside the cooler device to match with a liquid cooler device 5 or to match with a heat exchanger device 6; wherein the cooled down coolant gas flow is pumped through the inlet 111bof the rotational electrical machine 1bto enter the rotational electrical machine 1binterior to provide cooling for the rotational electrical machine, thereby the accumulated heat inside the enclosed type electrical machine casing can be effectively removed thus to improve the cooling effect of the rotational electrical machine 1b.

[0041] As shown in FIGS. 11 and 12, the said cooler 2cis an independent structure and appear in a bended piping casing 21c, whereof one or more than one heat dissipating fins 212care installed at the outside of the casing 21c; whereof the inlet 111cand outlet 112care respectively provided at selected locations on the casing 11cof the said rotational electrical machine 1c, further, its internal power output shaft 12cis also installed with a centrifugal type radial or axial fan 13c(as shown in FIG. 13), wherein the inlet of the cooler device 2cis connected to the outlet 112cof the rotational electrical machine 1c, and the said cooler device 2cis further connected to the inlet 111cof the rotational electrical machine 1cto allow the said cooler device 2cto be attached or ring installed at the outside of the casing 11cwhereby to cause the cooler device 2cand the casing of the rotational electrical machine 1cappear a special and inter-combined structure; thereby the hot gas is pumped to the cooler device 2cthrough the centrifugal type radial or axial fan 13cto achieve the aforesaid circulating heat dissipation effect.

[0042] The further embodying example structure of the invention is as shown in FIGS. 14 and 15, whereof the cooler device 2dis comprised of a casing 21dwith an internally installed air chamber 22d, whereof the outside of the casing 21dis installed with several heat dissipating fins 212dand the inside of the air chamber 22dis installed with heat absorbing fins 221dwhereby to cause the said air chamber 22dconstitute a bended circuit shape, and the both ends of the casing 21dare respectively provided with inlet 213dand outlet 214d; besides, the inlet 111dand the outlet 112dare respectively provided at proper locations on the casing, 111dof the said rotational electrical machine 1d, whereof its internal power output shaft 12dis installed with a centrifugal type radial or axial fan 13d(as shown in FIG. 16), therein the inlet pipe 213dof the said cooler device 2dis connected to the outlet 112dof the rotational electrical machine 1d, while the outlet pipe 214dof the said cooler device 2dis further connected to the inlet 111dof the rotational electrical machine 1dthereby to allow the said cooler device 2dbe attached to the outside of the casing 11d, wherein the cooler device 2dand the casing of the rotational electrical machine 1dare individually independent structures and they are further combined; thereby the hot gas is pumped to the cooler device 2dthrough the centrifugal type radial or axial fan 13dinstalled inside the said rotational electrical machine 1dto achieve the aforesaid circulating heat dissipating effect.

[0043] The cooler device 2d′ and the rotational electrical machine 1d′ of the invention can also be separated (as shown in FIG. 17 or FIG. 18) and interconnected through the inlet pipe 213d′ and the outlet pipe 214d′ whereby to constitute an enclosed type air cooling circuit structure of the invention, wherein the said cooler device 2d′ can be installed at other proper locations as required (as shown in FIG. 19 or FIG. 20), i.e. the cooler device 2d′ can-be installed on the casing 7 of other machine and is further matched with a free air cooler device 3, or the cooler device 2acan be matched with a conventional forced air cooler device 4, in addition, the cooling circuits can be installed inside the cooler device to match with a liquid cooler device 5 or to match with a heat exchanger 6 whereby the hot gas inside the cooler device 2d′ can be cooled and pumped to the rotational electrical machine 1d′ interior to effectively remove the accumulated heat inside the enclosed type rotational electrical machine casing thereby to improve the cooling effect.

[0044] In considering the economy of the structures, the cooler device of the invention can be directly designed to have an integrated structure with other devices (as shown in FIG. 21 or FIG. 22), whereof the cooler device 2eis in an integrated structure with the casing 81 of the transmission mechanism 8 and the outside of the casing 81 is made into a air chamber 22e, wherein several heat absorbing fins 221eare installed at the inside of the said air chamber 22e, and through the arrangement of the heat absorbing fins 221eto make the air chamber 22econstitute a bended circuit shape to improve its heat absorbing effect; thereof through the combination of the said rotational electrical machine 1eand the casing 81 of the transmission mechanism 8, its outlet 112ecan be connected to the inlet of the cooler device 2e, and the circuit end of the air chamber 22eis connected with an outlet pipe 214ewhich is further connected to the inlet 111eof the rotational electrical machine 1ethereby to constitute the enclosed type cooling flow circuit structure of the invention whereby to achieve the aim of improving the heat dissipating effect of the rotational electrical machine.

[0045] In addition, the pumping methods for the cooling air or other gases in the invention include the following:

[0046] A centrifugal type radial or axial fan 13 is installed on the rotating shaft of the rotational electrical machine 1 to transfer the air or other gases, or:

[0047] A gas pump 9 is further installed at the locations such as the inlet 111 or outlet 112 or pipe 22 or the cooler device to pump the air or other gases inside the rotational electrical device 1, or

[0048] A centrifugal type radial or axial fan 13 is simultaneously installed at the rotating shaft of the rotational electrical machine 1, and a gas pump 9 is further installed at the locations such as such as the inlet 111 or outlet 112 or pipe 22 or the cooler device 2 to pump the air or other gases inside the rotational electrical device 1.

[0049] The internal air chamber of the cooler device 2 in the aforesaid embodying examples can bean empty space or installed with internal heat conducting fins or can be further installed with air filter devices 222a, 222b, 222c, 222d, 222eor simultaneously installed with an clean cover or clean plug for opening/closing to remove the condensed moisture or the internally eroded fragment powders generated inside the rotational electrical machines 1a, 1b, 1c, 1d, 1e, such as the brush fragment powders of the DC machines thereby to avoid affecting the operating functions.

[0050] Besides, as shown in FIG. 23 and FIG. 24, the said cooler device 2fof the invention can also be used to provide a heating source function, wherein the pipe 22fcan be coupled with the heating target 100, and the hot gas produced by the rotational electrical machine 1 is passed through the pipe 22fto heat up the heating target coupled with the pipe 22fsuch as the car batteries. Thereof, a distributing pipe 22f′ and a control valve 200 (as shown in FIG. 25) can be further installed between the inlet and outlet of the pipe 22ftoward the heating target 100 to provide a bypassed or distributed hot gas flow for the cooler device 2f, and to further control the heating temperature of the heating target through switching the said control valve 200; therein the said control valve 200 can be operated manually or controlled through detection of the conventional temperature sensor device T100 which is selectively installed according to the requirements on the heating target to do bypass or distributing flow when reaching the set temperature in order to reduce or stop the heating process on the target objects; or the outside of the said pipe 22fas shown in FIG. 26 can be further installed with a air guiding pipe 223fto provide heat exchanged output from the hot gas flow produced by the rotational electrical machine so as to provide heating gas for other places' use, such as to produce warming effect in an enclosed or semi-enclosed space or warming up the car battery, etc.

[0051] As summarized from the above descriptions, the invention has disclosed an innovative design of an enclosed type air cooler device of the rotational electrical machine, wherein it is characterized in that the hot gas inside the enclosed type rotational electrical machine is pumped out to the outside air cooler device in an enclosed type air flow circuit and is then pumped back to the inside of the enclosed type rotational electrical machine without jeopardizing its enclosed function, therein it effectively improves the cooling effect of the enclosed type rotational electrical machine.