JP2017538899A - Cooling device for hydraulic mechanism and use of cooling device - Google Patents

Abstract

The present invention discloses a cooling device for a hydraulic mechanism provided with a container for hydraulic oil. A heat transfer tube is provided to cool the container. Here, the hydraulic oil in the container flows substantially linearly from the inlet to the outlet. At least one heat transfer tube is disposed between the inlet and the outlet.

Description

  The present invention is based on a cooling device for a hydraulic mechanism that cools a hydraulic oil container of the hydraulic mechanism. The invention also relates to the use of such a cooling device.

  From the prior art, for example, it is known to pump a pressure medium or hydraulic oil from a container via a hydraulic pump, for example an external gear pump, which can be driven by a motor with variable speed. On the output side of the pump, the pressure medium can be branched through a throttle, which can also be used to adjust the minimum speed of the pump. The pressure medium branched through the restriction can release heat to the surroundings by a radiator cooled by the fan air. In addition, the leakage of the pump can be supplied to the radiator. The disadvantage in this case is that the throttle causes hydraulic losses, which again generate waste heat. It is also a disadvantage that a constant cooling capacity of the pressure medium cannot be obtained because the volume flow through the radiator depends on the system pressure on the output side of the pump. Furthermore, the cooling of the pressure medium by the radiator can only be carried out during the operation of the pump.

  It is also known from the prior art that the pressure medium in the container is pumped through two pumps (double pumps) that can be driven in common by a motor having a variable rotation speed. Here, one of the pumps can pump a volume flow for the cooling circuit which can additionally have a filter. The disadvantage in this case is that an additional pump is required for the cooling, which increases the device technology costs and in particular the manufacturing costs. The additional pump can also be an additional sound source. It is also a disadvantage that the labor of the piping is relatively large, which increases the risk of leakage. Also, as is empirically known, the pump is the most wearable unit in the hydraulic system, so the use of a double pump can also increase the probability of failure. Furthermore, the additional pump creates hydraulic losses and thus additional heat loads. Since the plurality of pumps are coupled together, the volume flow of the cooling circuit varies depending on the volume flow of the primary circuit of the first pump. A further disadvantage is that cooling is only performed during the operation of the pump.

  In addition to the publications Japanese Patent Application No. 58196301 and Japanese Patent Application Publication No. 61116112, a cooling device for a container having a heat conducting tube in the form of a heat pipe is known.

  On the other hand, the problem underlying the present invention is that the pressure medium can be cooled even during the operation period of the hydraulic mechanism or in the stationary state of the hydraulic mechanism, and improved efficiency and small required space compared to the prior art. A cooling device for a hydraulic mechanism is provided. It is also an object of the present invention to present an advantageous use of the cooling device of the present invention.

  The problem with the cooling device is solved by the features of claim 1, and the problem with use is solved by the features of claim 15.

  Other advantageous embodiments of the invention are the subject of further dependent claims.

  According to the invention, a cooling device for a hydraulic mechanism is proposed. Here, the said cooling device contains the container or tank for hydraulic oil of a hydraulic mechanism. The container may have an inlet and an outlet that can be configured as a return pipe and a suction pipe. Advantageously, the cooling device has at least one heat transfer tube, preferably three heat transfer tubes, with a partial tube section of each heat transfer tube immersed in the vessel. Therefore, heat can be released from the hydraulic oil.

  The above solution has the advantage that such a cooling device can cool the hydraulic oil even when the hydraulic mechanism is stationary, by releasing heat through at least one heat conducting tube. Also, the cooling device has improved efficiency and requires less space than the prior art.

  The heat conducting tube is, for example, a heat pipe or a two-phase thermosiphon. The heat transfer tube has, for example, a coolant that vaporizes at a position to be cooled, whereby heat is released as heat of vaporization. In this case, the gaseous coolant can be dispersed in the heat-conducting tube and condensed on the cooled portion (heat sink) of the inner wall of the tube. In this case, the coolant can be flowed back to the position where it should be cooled again by gravity or capillary action.

  At least one heat transfer tube preferably protrudes from the container in a separate tube section in order to release heat to the outside.

  At least one heat transfer tube can be disposed in the hydraulic oil flow path between the inlet and the outlet. Preferably, the inflow port, the outflow port, and the at least one heat conducting tube are arranged to be substantially in series. By arranging the heat transfer tube in the above-described flow path, the hydraulic oil flowing from the inlet to the outlet advantageously circulates through the heat transfer tube during operation of the hydraulic mechanism.

  The flow path can be configured simply in terms of device technology, preferably extending in one direction, for example, between the inlet and the outlet. This is configured such that the direction of the flow path does not change at all or does not change significantly, which in particular allows a simple geometric shape of the container and minimizes flow losses.

  In another configuration of the present invention, two or more heat transfer tubes are provided. The heat conducting tubes are preferably arranged so that they are not positioned in series in the direction of the flow path. That is, the heat transfer tubes do not shadow each other, and more heat can be derived from the hydraulic oil to the heat transfer tubes. Preferably, the two or more heat transfer tubes are arranged in a direction substantially transverse to the flow path when viewed in the direction of the flow path, or in a common plane perpendicular to the direction of the flow path. Be placed. The heat transfer tubes can extend from each other, preferably spaced apart in parallel, for example. In addition, each heat conducting tube protruding from the container can also extend in substantially the same direction, here, for example, in the vertical direction.

  In order to improve heat supply and / or heat dissipation, a cooling structure may be provided in at least one heat conducting tube. The cooling structure is preferably at least thermally connected to the heat transfer tube. The cooling structure can also be mechanically connected to the at least one heat transfer tube or can be formed integrally with the heat transfer tube. A cooling structure inside the container and a cooling structure outside the container can also be provided. The cooling structure has, for example, a plurality of or many fins that can be configured as a fin set. For example, the fin extends substantially perpendicular to the at least one heat conducting tube. The fins can also be spaced apart substantially parallel to each other. Each cooling structure can also share two or more heat transfer tubes.

  The size of the cooling structure in the container substantially corresponds to the flow cross-sectional area of the flow path of the container or the cross-sectional area of the container in the flow direction. Accordingly, the fins of one or more heat transfer tubes can be disposed in the container over substantially the entire cross section of the container. Due to the geometry of the inlet on one side of the fin set and the outlet on the other side of the fin set, the volume flow can be guided through the fin set. This increases the amount of heat transport from the hydraulic oil to the fins and thus to one or more heat transfer tubes.

  The cooling structure can be provided in the tube area of the at least one heat transfer tube that is present in the vessel. In addition or alternatively, a cooling structure may be provided in the tube area of the at least one heat transfer tube that exists outside the container.

  The cooling structure can be configured to facilitate the hydraulic oil outgassing process.

  At least one heat transfer tube and / or cooling structure can be cooled outside the vessel by forced convection, in particular by a fan. Alternatively or additionally, at least one heat transfer tube and / or cooling structure may be cooled outside the vessel by a heat exchanger. In this case, for example, a material flow (cooling water) can be passed through the heat exchanger. That is, the heat exchanger can include a cooling water circulation circuit. Alternatively or in addition, the heat exchanger is connected thermally and / or mechanically (in particular directly) to the casing of the hydraulic mechanism, in particular to the mechanical casing, and the heat is released to the casing. It can also be made.

  Advantageously, the flow cross-sectional area of the flow path is reduced in a constricted manner in the region of at least one heat transfer tube and / or in the region of the cooling structure. This is advantageous when the heat transfer tube and / or the cooling structure (fin set) is not arranged on the entire cross section of the container, and in this way the hydraulic oil is forced into the heat transfer tube and / or the cooling structure. Can conduct to the body. Further, the flow rate of the hydraulic oil can be increased by the narrowed reduced portion, and thereby the circulation of the heat conducting tube and / or the cooling structure can be improved.

  At least the heat-conducting tube and / or the cooling structure can be arranged, for example, in a region of the container having the smallest cross-sectional area.

  The flow cross-sectional area is reduced by, for example, a flow guide. The flow guide is preferably a ramp or partition that reduces the flow cross-sectional area. If a ramp is provided, the ramp extends, for example, obliquely starting from the bottom of the container, in particular substantially in the flow direction. The reduction rate of the flow cross-sectional area is preferably constant, which improves the flow characteristics of the hydraulic oil.

  In another configuration of the invention, hydraulic oil can be pumped from the outlet through a hydraulic machine that can be driven by a drive unit. In addition to the cooling by the at least one heat transfer tube and / or the cooling structure, the drive unit can have a unique cooling device that can be easily used in terms of device technology. Preferably, the cooling device of the drive unit is a fan, and the air flow of this fan is used for cooling. Therefore, the geometrical arrangement in which the fin set is arranged behind the motor fan outside the container can increase the amount of heat transport to the surroundings by the air volume flow thus formed.

  Advantageously, the drive unit and the hydraulic machine can form a motor-pump unit or a motor-pump group. Preferably, a device comprising the cooling device of the present invention and a motor-pump unit can be provided. The motor-pump unit is preferably arranged directly or adjacent to at least one external heat transfer tube and / or adjacent to a cooling structure external to the heat transfer tube.

  Advantageously, in addition to at least one heat transfer tube for the container, another heat transfer tube for another element of the hydraulic mechanism can be provided. In this case, the further heat transfer tube can be arranged to have at least a tube area adjacent to the tube area of the at least one heat transfer tube of the container. In this case, the heat transfer tube can focus the heat of the vessel as well as the heat of one or more other elements, such as the drive unit or other “hot spots”. Thereby, the temperature of the whole hydraulic mechanism can be kept constant and / or heat can be released together. Thus, in this concept, the thermal energy can be focused and released and optionally further utilized in another process.

  The heat transfer tubes and at least one other element of the container are preferably cooled in common.

  As noted above, the waste heat of at least one heat transfer tube of the vessel and / or element can be used in at least one other process.

  The heat-conducting tube for the container and the cooling structure used therewith are preferably configured so that a substantially constant temperature is generated on both the heat absorption surface and the heat dissipation surface. Thereby, the temperature difference with respect to hydraulic oil or the circumference | surroundings can be made substantially equal over the whole area. Thereby, the heat radiation power in the same area becomes comparatively high, and the cooling device can be configured more compactly.

  In an advantageous use of the cooling device, the cooling device is configured to be used in a hydraulic mechanism which may be a so-called “small unit” having a relatively small required cooling amount. Preferably, the hydraulic mechanism or its container has a cooling capacity of up to 1000 W, preferably up to 300 W to 500 W. Thus, when the cooling device is used in a small unit, it is advantageous to have access to products in the computer industry. This is because, for example, current graphic cards have similar cooling capabilities. For example, heat transfer tubes have been extensively developed technically in the computer industry and are usually low cost.

  Other advantageous embodiments are the subject of the respective dependent claims.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

It is the schematic which shows the cooling device by 1st Embodiment. It is the schematic which shows the cooling device by 2nd Embodiment. It is the schematic which shows the cooling device by 3rd Embodiment. It is the schematic which shows the cooling device by 4th Embodiment. It is the schematic which shows the cooling device by 5th Embodiment. It is the schematic which shows the temperature distribution of a cooling device.

  According to FIG. 1, the cooling device 1 has a container 2 for hydraulic oil. The hydraulic oil 6 is supplied from the hydraulic mechanism to the container 2 through the inlet 4 in the form of a supply line. Thereafter, the hydraulic oil 10 flows out of the container 2 through the outlet 8 in the form of an outlet line. According to the embodiment of FIG. 1, the inlet 4 and the outlet 8 are spaced apart from each other substantially in parallel. The container 2 has a rectangular parallelepiped shape, for example. Three heat transfer tubes 12, 14, and 16 are provided between the inlet 4 and the outlet 8. The three heat conducting tubes are configured in a rod shape, for example, and are immersed in the container 2 at the location of the tube section 18, and project from the container 2 at the location of another tube section 20. The heat conducting tubes 12 to 16 extend in a substantially vertical direction, and are spaced apart from each other in parallel. In this case, the heat conducting tubes 12 to 16 extend in one common plane, for example. A cooling structure in the form of a fin set 22 is arranged in the tube section 18 in the heat transfer tubes 12-16. The said cooling structure is arrange | positioned in the said plane with the heat exchanger tubes 12-16. The fin set 22 includes a plurality of fins that are spaced apart from and substantially parallel to each other. Here, each fin extends substantially in the horizontal direction.

  The flow path 24 in the container 2 is guided, for example, in a single direction from the inlet 4 to the outlet 8. In this case, the fin set 22 is disposed in the flow path 24. According to FIG. 1, the plane on which the fin set 22 and the heat conducting tubes 12 to 16 are disposed extends in a substantially transverse direction with respect to the flow path 24. The fin set 22 extends over substantially the entire cross section of the container 2 so that, for example, all of the hydraulic oil flowing from the inlet 4 to the outlet 8 flows therethrough or circulates. Therefore, the heat 26 can be supplied from the pressure medium in the container 2 to the heat conducting tubes 12 to 16 directly or via the fin set 22.

  A cooling structure in the form of a fin set 28 is likewise arranged correspondingly in the tube section 20 outside the container 2. The cooling structure is configured correspondingly to the fin set 22 of FIG. In this case, the heat 30 can be released directly from the tube section 20 of the heat conducting tubes 12 to 16 to the surroundings via the fin set 28. Additionally, a fan 32 that increases the amount of air flowing through the fin set 28 is provided.

  That is, according to FIG. 1, the container 2 in which the fin set 22 is arranged in the entire cross section is shown. In this case, the fin set 22 is thermally connected to the plurality of heat conducting tubes 12 to 16. Here, the outflow port 8 is provided on one side of the fin set 22 and the inflow port 4 is provided on the other side. Thus, the heat transfer amount from the hydraulic oil to the internal fin set 22 is increased by the settable volume flow of the hydraulic oil generated in the container 2 during driving. Subsequently, the heat conducting tubes 12 to 16 transport heat energy to the external fin set 28. Here, the amount of heat transported to the ambient air is increased by the fan 32.

  FIG. 2 shows the cooling device 34. Unlike FIG. 1, the cooling device 34 does not have a fan 32 and an external fin set 28. Instead, a heat exchanger 36 is provided. The said heat exchanger 36 is arrange | positioned at the edge part side of the heat exchanger tubes 12-16. In the heat exchanger, heat energy can be released, for example, via a cooling water circulation circuit or to a heat transport material in the machine casing. In this case, the thermal energy of the hydraulic mechanism is focused in one region and can be supplied to another process as needed, especially when multiple hydraulic mechanisms are used.

  In FIG. 3, the cooling device 38 has an internal fin set 40 that is reduced compared to the embodiment of FIG. Moreover, the heat-conducting tubes 12-16 in the container 2 are shortened. Therefore, the fin set 40 occupies a smaller cross-sectional area at the locations of the heat transfer tubes 12 to 16 in the container 2, and for this reason, the fin set 40 is not arranged in the entire cross-section of the container 2. Here, a flow guide 42 is provided to increase the amount of heat transport. This prevents the hydraulic oil from passing over the fin set 40 or the heat conducting tubes 12-16. Furthermore, the high flow rate of the hydraulic oil also increases the amount of heat transport. The flow guide 42 is configured as a ramp extending from the container bottom 44 to the fin set 40 or the heat transfer tubes 12 to 16. In this case, the fin set 40 is arrange | positioned with the heat exchanger tubes 12-16 in the location where the cross-sectional area of the container 2 is the narrowest.

  In FIG. 4, the cooling device 46 does not have the fan 32 unlike FIG. Instead, the motor fan 48 of the motor 50 is used. That is, the motor fan 48 is used for cooling the motor 50 and cooling the external fin set 28 and the heat conducting tubes 12 to 16. The pump 52 is driven by the motor 50. The pump 52 pumps hydraulic oil from the container 2 through the outlet 8. That is, according to FIG. 4, the motor 50 and the pump 52 forming the motor-pump unit are arranged or assembled so as to be directly aligned with the external fin set 28. In this case, the motor fan The volumetric flow formed by 48 can increase the amount of heat transport in the fin set 28 or the heat conducting tubes 12-16.

  The cooling device 54 in FIG. 5 includes other heat conducting tubes 56 and 58 in addition to the heat exchanger 36 in FIG. 2. The heat conducting tube 56 is used for cooling the motor 50, and the heat conducting tube 58 is used for cooling the pump 52. Additionally, additional heat transfer tubes may be provided for other areas or elements to be cooled of the hydraulic mechanism. The heat transfer tubes 56, 58 and 12-16 are commonly focused in the heat exchanger 36 and can be cooled as desired by the cooling water circulation circuit or can release heat to the heat transport material of the machine casing. In this way, the thermal energy can be focused and reused in another process as needed.

  The heat transfer tubes 12-16 and / or 56, 58 and / or the cooling structure may be parts of the computer industry. The heat transfer tubes 12 to 16 and the cooling structure thereof are configured for a cooling capacity of 300 W to 500 W, for example.

  FIG. 6 shows an example of the temperature distribution of the fin set 60 including the heat conducting tube. It can be seen that the temperature of the fin set 60 is in a substantially uniform temperature range. In this way, heat can be released and / or absorbed with a substantially uniform temperature gradient throughout the fin set 60.

  Disclosed is a cooling device for a hydraulic mechanism including a container for hydraulic oil. A heat transfer tube is provided to cool the container. Here, the hydraulic oil in the container flows from the inlet to the outlet almost linearly. At least one heat pipe is disposed between the inlet and the outlet.

  1, 34, 38, 46, 54 Cooling device, 2 containers, 4 inlet, 6,10 hydraulic oil, 8 outlet, 12, 14, 16, 56, 58 heat transfer pipe, 18, 20 pipe area, 22, 28, 40, 60 fin set, 24 flow path, 26, 30 heat, 32 fan, 36 heat exchanger, 42 flow guide, 44 container bottom, 48 motor fan, 50 motor, 52 pump

Claims (15)

A cooling device for a hydraulic mechanism comprising a container (2) for hydraulic oil having an inlet (4) and an outlet (8),
At least one heat transfer tube (12, 14, 16) is provided;
The heat transfer pipe (12, 14, 16) is immersed in the container (2) in a part of the pipe area (20) in order to release heat from the hydraulic oil.
Cooling system. The at least one heat transfer pipe (12, 14, 16) is disposed in the hydraulic oil flow path (24) between the inlet (4) and the outlet (8).
The cooling device according to claim 1. The flow path (24) extends substantially in one direction between the inlet (4) and the outlet (8).
The cooling device according to claim 2. Two or more of the heat transfer tubes (12, 14, 16) are arranged so as not to line up in series when viewed in the direction of the flow path (24).
The cooling device according to any one of claims 1 to 3. The at least one heat conducting tube (12, 14, 16) is provided with a cooling structure (22, 28).
The cooling device according to any one of claims 1 to 4. The size of the cooling structure (22) in the container (2) substantially corresponds to the flow cross-sectional area of the container (2).
The cooling device according to claim 5. The cooling structure (22) is provided in a tube section (18) present in the vessel (2) of the at least one heat transfer tube (12, 14, 16) and / or
The cooling structure (28) is provided in a tube area (20) outside the container (2) of the at least one heat transfer tube (12, 14, 16).
The cooling device according to claim 5 or 6. The cooling structure (22) is configured to facilitate a gas discharge process of the hydraulic oil,
The cooling device according to any one of claims 5 to 7. The at least one heat transfer tube (12, 14, 16) is cooled by forced convection outside the container (2),
The cooling device according to any one of claims 1 to 8. The at least one heat transfer pipe (12, 14, 16) is cooled by a heat exchanger (36) outside the container (2).
The cooling device according to any one of claims 1 to 9. The flow cross-sectional area of the container (2) is reduced in a throttle shape in the region of the at least one heat transfer tube (12, 14, 16).
The cooling device according to any one of claims 1 to 10. The hydraulic oil can be pumped from the outlet (8) via a hydraulic machine (52) that can be driven by a drive unit (50),
The drive unit (50) has a cooling device used in addition to the cooling of the at least one heat conducting tube (12, 14, 16).
The cooling device according to any one of claims 1 to 11. At least one other heat transfer tube (56, 58) is provided for another element (50, 52) of the hydraulic mechanism;
Said at least one further heat transfer tube (56, 58) has a tube area adjacent to the tube area (20) outside said container (2) of said at least one heat transfer tube (12, 14, 16). Located in the
The cooling device according to any one of claims 1 to 12. Waste heat of at least one of the heat transfer tubes (12, 14, 16, 56, 58) is used for at least one other process;
The cooling device according to any one of claims 1 to 13.   15. Any one of claims 1 to 14 for a hydraulic mechanism, at least for a hydraulic mechanism configured such that the container has a relatively small required cooling, in particular a cooling capacity of up to about 1000 W, preferably up to 300 W to 500 W Use of the cooling device described in the paragraph.

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