A circulating cooling system for a hydraulic system

Abstract

This utility model discloses a circulating cooling system for a hydraulic system, including an oil tank. The oil supply chamber of the oil tank is connected to the oil inlet of the hydraulic system via an oil supply pipeline. The oil return end of the hydraulic system is connected to the oil return chamber of the oil tank via a first oil return pipeline, used to return warm oil output from the hydraulic system to the oil tank. The oil return end of the hydraulic system is connected to the oil inlet of a heat exchanger via a second oil return pipeline, used to return hot oil output from the hydraulic system to the oil return chamber after flowing through the heat exchanger. The oil return chamber is connected to the oil supply chamber, and the oil outlet of the heat exchanger extends into the connecting area between the oil return chamber and the oil supply chamber, used to input cold oil to form a transition zone. This utility model can meet the cooling requirements of hydraulic oil in high-flow hydraulic systems.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic system technology, and in particular to a circulating cooling system for a hydraulic system. Background Technology

[0002] Hydraulic oil temperature control is crucial. The viscosity of hydraulic oil is significantly affected by temperature, and excessively high oil temperature can affect the stability of the hydraulic system, especially in high-flow hydraulic systems. Due to the large oil supply demand and system complexity, the system generates a lot of heat, and the time available for natural heat dissipation is short, leading to heat accumulation and affecting the overall performance of the hydraulic system. Typically, oil temperature is reduced by circulating and cooling the oil in the tank. However, in high-flow hydraulic systems, the oil temperature is even higher, and the cooling capacity is much greater, making traditional circulating cooling methods ineffective. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides a circulating cooling system for hydraulic systems that can meet the cooling requirements of hydraulic oil in large-flow hydraulic systems.

[0004] Technical solution: To achieve the above objectives, this utility model provides a circulating cooling system for a hydraulic system, including an oil tank, wherein the oil supply chamber of the oil tank is connected to the oil inlet of the hydraulic system via an oil supply pipeline.

[0005] The return oil end of the hydraulic system is connected to the return oil chamber of the oil tank through the first return oil pipeline, which is used to return the warm oil output by the hydraulic system to the oil tank.

[0006] The return oil end of the hydraulic system is connected to the inlet end of the heat exchange device through the second return oil pipeline, which is used to return the hot oil output by the hydraulic system to the return oil chamber after passing through the heat exchange device.

[0007] The return oil chamber is connected to the supply oil chamber, and the oil outlet of the heat exchanger extends to the connecting area between the return oil chamber and the supply oil chamber to input cold oil and form a transition zone.

[0008] Furthermore, the oil return chamber is provided with an oil extraction port, which is connected to the oil inlet of the heat exchange device via a suction pump.

[0009] Furthermore, the oil outlets of the second return oil pipeline and the suction pump are connected to the oil inlet of the confluence module, and the oil outlet of the confluence module is connected to the oil inlet of the heat exchange device.

[0010] Furthermore, the oil outlet of the first oil return pipeline extends to the lower part of the oil return chamber, and the oil extraction port is correspondingly located at the bottom of the oil return chamber.

[0011] Furthermore, the oil outlet of the first return oil pipeline and the oil extraction port are both located in the middle area of ​​the lower part of the return oil chamber, and the oil outlet of the heat exchange device extends to the side of the return oil chamber away from the transition zone through a cold oil branch.

[0012] Furthermore, the oil supply chamber is equipped with a temperature monitoring module, which is electrically connected to the suction pump via a controller.

[0013] Furthermore, the oil supply chamber and the oil return chamber are separated by a partition assembly within the inner cavity of the oil tank.

[0014] Furthermore, the partition assembly includes multiple partitions, and the transition area is formed between the multiple partitions, and the transition area has a U-shaped channel structure.

[0015] Furthermore, the oil outlet of the heat exchange device extends to the lower part of the transition zone through a cold oil branch. The upper part of the transition zone has two channels that connect the oil supply chamber and the oil return chamber respectively. The channel connecting the oil supply chamber is wider than the channel connecting the oil return chamber.

[0016] Beneficial effects: The circulating cooling system of this utility model ensures sufficient oil volume in the oil tank by directly returning warm oil to the tank to meet the high-flow oil supply requirements of the system. In addition, the hot oil is cooled by heat exchange before returning to the tank, which reduces the heat entering the tank. The cooled oil forms a transition zone between the warm oil returning to the tank and the cold oil supplied, which inhibits temperature diffusion. This mixes and cools the warm oil gradually diffusing into the oil supply chamber, thereby ensuring that the oil temperature in the oil supply chamber remains relatively low. This ensures that the hydraulic oil entering the hydraulic system is cold oil, thus ensuring the stability of the hydraulic system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the system framework structure of one embodiment of the circulating cooling system of this utility model. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] As attached Figure 1The circulating cooling system of the hydraulic system includes an oil tank 1. The oil supply chamber 11 of the oil tank 1 is connected to the oil inlet of the hydraulic system 3 via an oil supply pipeline 2. The oil return end of the hydraulic system 3 is connected to the oil return chamber 12 of the oil tank 1 via a first oil return pipeline 4, which is used to return the warm oil output by the hydraulic system 3 to the oil tank 1. The oil return end of the hydraulic system 3 is connected to the oil inlet of a heat exchange device 6 via a second oil return pipeline 5, which is used to return the hot oil output by the hydraulic system 3 to the oil return chamber 12 after flowing through the heat exchange device 6. The oil return chamber 12 is connected to the oil supply chamber 11. The oil outlet end of the heat exchange device 6 extends to the communication area between the oil return chamber 12 and the oil supply chamber 11, which is used to input cold oil to form a transition zone 13.

[0020] By forming relatively separate but interconnected oil supply and return chambers within the oil tank, the oil returning to the tank will not directly enter the oil supply chamber and re-enter the hydraulic system. Furthermore, the relatively cooler oil in the return flow is directly returned to the oil tank, while the hotter oil is cooled through heat exchange before returning to the oil tank. This reduces the amount of heat directly entering the oil tank, preventing heat accumulation that could lead to excessively high oil temperatures within the tank, and thus avoiding any impact on the viscosity of the hydraulic fluid.

[0021] Especially in high-flow hydraulic systems, the large flow rate leads to high heat generation, short cooling time, and easy heat accumulation. This solution directly returns warm oil to the oil tank, ensuring that the oil level in the tank remains within a certain range, sufficient to meet the oil supply needs of high-flow hydraulic systems. In addition, the cooled oil formed after heat exchange can mix with and distribute some of the heat from the warm oil after returning to the oil tank, thereby reducing the amount of heat entering the hydraulic system per unit time.

[0022] Based on this, the cooled oil returns to the connecting area between the supply and return oil chambers, forming a cold oil zone in this area. Cold oil is continuously replenished in this zone. Because heat transfer between oils is relatively slow, this cold oil zone acts as a transition zone, inhibiting heat transfer to the supply chamber. Simultaneously, it allows the oil in the return chamber more time for natural heat dissipation as it flows towards the supply chamber. Combined with the mixing of cold oil, this effectively lowers the oil temperature in the supply chamber, ensuring that the oil entering the hydraulic system is relatively cold and maintaining the stability of the hydraulic system.

[0023] The oil return chamber 12 is equipped with an oil extraction port 121, which is connected to the oil inlet of the heat exchange device 6 via a suction pump 7. This allows for the extraction of a portion of the warm oil returning to the oil tank for heat exchange and cooling, forming a self-circulating cooling path within the oil tank. The suction pump 7 can be a variable displacement pump, allowing for control of the extraction volume. While ensuring the oil tank can meet its oil supply requirements, it can extract an appropriate amount of warm oil for cooling, further reducing the heat within the oil tank and simultaneously increasing the amount of cold oil returning, thus further lowering the overall oil temperature within the tank.

[0024] The outlet ends of the second return oil pipeline 5 and the suction pump 7 are connected to the inlet end of the confluence module 8, and the outlet end of the confluence module 8 is connected to the inlet end of the heat exchange device 6. The confluence module 8 adopts a valve block structure, which pre-mixes the heat of the extracted warm oil and the return oil within the valve block, thereby evenly distributing the heat. This results in a lower heat content per unit volume of oil when flowing through the heat exchange device at the same flow rate, thus improving heat exchange efficiency. This also shortens the time for the hot oil to cool and return, allowing more cold oil to quickly return to the oil tank to meet the oil supply needs of the high-flow system. At the same time, it allows more warm oil to enter the circulation cooling system to exchange more heat and improve the cooling effect.

[0025] The oil outlet of the first return oil pipe 4 extends to the lower part of the return oil chamber 12, and the oil extraction port 121 is correspondingly located at the bottom of the return oil chamber 12. This ensures that the portion of warm oil drawn into the circulating cooling system is relatively warm oil at a higher temperature, rather than warm oil that has already been mixed with cold oil, thus maximizing the removal of more heat.

[0026] The oil outlet of the first return oil pipeline 4 and the oil suction port 121 are both located in the middle area of ​​the lower part of the return oil chamber 12. The oil outlet of the heat exchange device 6 extends to the side of the return oil chamber 12 away from the transition zone 13 through a cold oil branch 61. The transition zone is a cold oil zone, and the cold oil output from the cold oil branch 61 forms another cold oil zone, thus forming a temperature distribution structure in which the cold oil zones on both sides enclose the warm oil zone in the middle. This can block the temperature in the lower middle area of ​​the return oil chamber to a certain extent, and the temperature gradually decreases from this area to the surrounding areas. This can suppress the diffusion of heat towards the oil supply chamber and guide the heat towards the suction port, ensuring that the oil temperature supplied to the hydraulic system is relatively low.

[0027] The oil supply chamber 11 is equipped with a temperature monitoring module, which is electrically connected to the suction pump 7 via a controller. When the oil temperature in the oil supply chamber is too high, the flow rate of the suction pump 7 can be appropriately increased. Conversely, when the oil temperature in the oil supply chamber is sufficient to stabilize the hydraulic system, the flow rate of the suction pump 7 can be appropriately decreased, thereby reducing the burden on the heat exchange device. If water is used as the heat exchange medium, the water consumption and the operating energy consumption of the heat exchange device can be effectively reduced.

[0028] The oil supply chamber 11 and the oil return chamber 12 are separated by a partition assembly 9 within the inner cavity of the oil tank 1. In one embodiment, they are separated by a partition, with the upper part of the partition forming a communication port between the oil supply chamber 11 and the oil return chamber 12 with the inner wall of the oil tank 1. The partition can prevent impurities carried out by the return oil from entering the oil supply chamber.

[0029] In another embodiment, the baffle assembly 9 includes multiple baffles, with the transition zone 13 formed between the baffles, and the transition zone 13 has a U-shaped channel structure. This can prolong the time for warm oil to diffuse into the oil supply chamber to a certain extent, and increase the thorough mixing of warm oil and cold oil in the transition zone, ensuring that the temperature drops to the expected range when entering the oil supply chamber.

[0030] The oil outlet of the heat exchanger 6 extends to the lower part of the transition zone 13 via a cold oil branch 61. The upper part of the transition zone 13 has two channels connecting the oil supply chamber 11 and the oil return chamber 12, respectively. The channel connecting the oil supply chamber 11 is wider than the channel connecting the oil return chamber 12. This allows the cold oil returning from the oil supply chamber to enter the oil supply chamber more easily and creates some resistance to the diffusion of warm oil, promoting the mixing of warm and cold oil and improving the mixing cooling effect.

[0031] The above are merely preferred embodiments of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A circulating cooling system for a hydraulic system, characterized by: It includes an oil tank (1), and the oil supply chamber (11) of the oil tank (1) is connected to the oil inlet of the hydraulic system (3) through an oil supply pipeline (2); The return oil end of the hydraulic system (3) is connected to the return oil chamber (12) of the oil tank (1) through the first return oil pipeline (4) to return the warm oil output by the hydraulic system (3) to the oil tank (1); The return oil end of the hydraulic system (3) is connected to the inlet end of the heat exchange device (6) through the second return oil pipeline (5) to return the hot oil output by the hydraulic system (3) to the return oil chamber (12) after passing through the heat exchange device (6). The return oil chamber (12) is connected to the supply oil chamber (11), and the oil outlet of the heat exchange device (6) extends to the communication area between the return oil chamber (12) and the supply oil chamber (11) for inputting cold oil to form a transition zone (13).

2. A hydraulic system's circulating cooling system according to claim 1, characterized in that: The return oil chamber (12) is provided with an oil extraction port (121) and is connected to the oil inlet of the heat exchange device (6) through a suction pump (7).

3. A hydraulic system's circulating cooling system according to claim 2, characterized in that: The oil outlets of the second return oil pipeline (5) and the suction pump (7) are connected to the oil inlet of the confluence module (8), and the oil outlet of the confluence module (8) is connected to the oil inlet of the heat exchange device (6).

4. A hydraulic system's circulating cooling system according to claim 2, characterized in that: The oil outlet of the first return oil pipeline (4) extends to the lower part of the return oil chamber (12), and the oil extraction port (121) is correspondingly located at the bottom of the return oil chamber (12).

5. A hydraulic system's circulating cooling system according to claim 4, characterized in that: The oil outlet of the first return oil pipeline (4) and the oil extraction port (121) are both located in the middle area of ​​the lower part of the return oil chamber (12). The oil outlet of the heat exchange device (6) extends to the side of the return oil chamber (12) away from the transition zone (13) through a cold oil branch (61).

6. A hydraulic system's circulating cooling system according to claim 2, characterized in that: The oil supply chamber (11) is equipped with a temperature monitoring module, which is electrically connected to the suction pump (7) via a controller.

7. A hydraulic system's circulating cooling system according to claim 1, characterized in that: The oil supply chamber (11) and the oil return chamber (12) are separated by a partition group (9) from the inner cavity of the oil tank (1).

8. A hydraulic system's circulating cooling system according to claim 7, characterized in that: The partition group (9) includes multiple partitions, and the transition area (13) is formed between the multiple partitions. The transition area (13) is a U-shaped channel structure.

9. A hydraulic system's circulating cooling system according to claim 8, characterized in that: The oil outlet of the heat exchange device (6) extends to the lower part of the transition zone (13) through a cold oil branch (61). The upper part of the transition zone (13) has two channels that connect the oil supply chamber (11) and the oil return chamber (12), respectively. The channel connecting the oil supply chamber (11) is wider than the channel connecting the oil return chamber (12).

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