Composite cooling device of hydraulic oil system and control method of composite cooling device

Abstract

The invention belongs to the field of hydraulic oil heat dissipation, and particularly relates to a composite cooling device of a hydraulic oil system and a control method thereof.The device comprises a shell provided with a liquid inlet, a liquid outlet, a water inlet, a water outlet, a water return port, an inlet pipe plate, an outlet pipe plate, a channel, a circulation pipe bundle, a ventilation pipeline, a channel door, a water return device and a monitoring and control system. If the hydraulic oil system is in a low-temperature working condition, the device can be subjected to air-cooling heat dissipation, when the hydraulic oil system is in a high-temperature working condition, the device can be subjected to water-cooling heat dissipation, and air cooling and water cooling can be carried out at the same time; and when the temperature of the hydraulic oil is reduced from high temperature to low temperature, the water conveying device is closed, and the cooling water in the shell is stored through the water return device for cyclic utilization. The cooling efficiency of the hydraulic oil can be controlled according to the temperature of the hydraulic oil, the defects caused by a single cooling mode can be overcome, and the optimal cooling effect and energy efficiency balance can be achieved under all working conditions.

Description

Technical Field

[0001] This invention relates to the field of hydraulic oil heat dissipation, and more specifically to a composite cooling device for a hydraulic oil system and its control method. Background Technology

[0002] Hydraulic systems are widely used in engineering machinery, industrial equipment, and aerospace. During power transmission, hydraulic oil generates a significant amount of heat, causing its temperature to rise. Excessively high oil temperatures reduce its lubricating properties and damage sealing elements, ultimately leading to decreased system efficiency and shortened component lifespan. Therefore, effective cooling of the hydraulic oil is crucial for ensuring the stable and reliable operation of hydraulic systems.

[0003] To address the aforementioned issues, common hydraulic oil cooling methods are primarily divided into two types: air cooling and water cooling. Air cooling offers advantages such as simple structure and easy installation, but its cooling capacity is insufficient under high-temperature environments or heavy heat loads. Water cooling, on the other hand, boasts high heat exchange efficiency and excellent cooling effect, but its complex structure and potential for overcooling can lead to resource waste.

[0004] The above-mentioned single cooling method often fails to achieve the optimal cooling effect and energy efficiency balance under all operating conditions. Therefore, it is necessary to design a composite cooling device and its control method for hydraulic oil system that can simultaneously adopt air cooling and water cooling methods. This can control the cooling efficiency of hydraulic oil according to the temperature of hydraulic oil and avoid the shortcomings of a single cooling method. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to design a composite cooling device and control method for a hydraulic oil system, which can control the cooling efficiency of the hydraulic oil according to the temperature of the hydraulic oil, and avoid the shortcomings of a single cooling method.

[0006] The technical solution adopted by this invention to solve its technical problem is: a composite cooling device for a hydraulic oil system, characterized in that it comprises: a shell, wherein the shell is provided with an inlet and an outlet for hydraulic oil, an inlet, an outlet, and a return outlet for cooling water, an inlet tube sheet and an outlet tube sheet for hydraulic oil, and a channel; a flow tube bundle, wherein the flow tube bundle includes multiple heat exchange tubes connected in parallel, one end of each heat exchange tube being connected to the inlet through the inlet tube sheet, and the other end being connected to the outlet through the outlet tube sheet; the flow tube bundle is connected to the shell, the inlet tube sheet, and the outlet... A tube sheet forms a cooling water channel, which is connected to the inlet, outlet, and return outlet; a ventilation duct runs through both sides of the housing and connects to the outside; a channel door is installed on the channel to close it; a water supply device is connected to the inlet; and a water return device includes a water return container, a first valve, and a second valve. The water return container is connected to the return outlet through the first valve, and to the inlet through the second valve. It also includes a monitoring and control system, comprising a control module, a measurement module, and an alarm module. The control module has preset temperatures for the hydraulic oil: a first preset temperature, a second preset temperature, a third preset temperature, and a fourth preset temperature. The measurement module measures the operating parameters of the cooling device, including the hydraulic oil temperature, cooling water flow rate, and the cooling water level in the housing. The data from the measurement module is uploaded to the control module in real time. When the hydraulic oil temperature rises above the first preset temperature but below the third preset temperature, the control module opens the passage door. When the hydraulic oil temperature rises above the third preset temperature but below the fourth preset temperature, the control module closes the passage door and controls the water supply device to operate. When the hydraulic oil temperature drops below the second preset temperature, the control module controls the water supply device to close, opens the first valve of the return water device, and opens the passage door when the cooling water level in the housing is zero. When the hydraulic oil temperature is above the fourth preset temperature, the control module controls the alarm module to issue an alarm signal and controls the hydraulic system to stop operating.

[0007] Furthermore, the ventilation duct is a vertical duct.

[0008] Furthermore, the ventilation duct is located at the end of the housing where the liquid inlet is located.

[0009] Furthermore, the passage door is configured to open from both sides, and there is a sealing mechanism between the passage door and the housing.

[0010] Furthermore, the channel door is located at the liquid outlet end of the housing.

[0011] Furthermore, the composite cooling device also includes an air supply device, wherein the air supply device supplies airflow directly towards the channel and / or the ventilation duct.

[0012] Furthermore, when the hydraulic oil temperature rises to a level higher than the first preset temperature but lower than the third preset temperature, the control module controls the air supply device to operate; when the hydraulic oil temperature drops to a level lower than the first preset temperature, the control module controls the air supply device to shut down, thereby closing the passage door.

[0013] A control method for a hydraulic system composite cooling device, characterized by comprising the following steps: S101: Measure the hydraulic oil temperature t using the aforementioned measurement module. i ; S102: When t i When the temperature rises to a level higher than the first preset temperature t1 but lower than the third preset temperature t3, the control module opens the channel door and controls the air supply device to operate. S103: When t i When the temperature rises to a level higher than the third preset temperature t3 but lower than the fourth preset temperature t4, the control module closes the channel door and controls the water conveying device to operate. S104: When t i When the temperature exceeds the fourth preset temperature t4, the control module controls the alarm module to issue an alarm signal and controls the hydraulic system to stop working. S105: When t i When the temperature drops below the second preset temperature t2, the control module controls the water supply device to shut down and opens the first valve of the return water device. When the water level of the cooling water in the shell is zero, the channel door is opened. S106: When t i When the temperature drops below the first preset temperature t1, the control module controls the air supply device to shut down and closes the passage door.

[0014] The beneficial effects of this invention are as follows: This invention achieves combined air-cooling and water-cooling of hydraulic oil through the combination of ventilation ducts, access doors, water supply devices, water return devices, and a control system. The invention also allows for automatic switching between air-cooling and water-cooling by opening and closing the access doors. When the device is not in operation, the channel door is closed to prevent airflow from blowing dust onto the flow tube bundle, thus avoiding dust accumulation that could affect the heat dissipation of the flow tube bundle. When the device is in operation, if the hydraulic oil system is in the initial working stage, the cooling device is cooled by natural convection through the gas in the ventilation duct. When the hydraulic oil system is in the normal working stage, if the channel door is open, the flow tube bundle can be air-cooled through the air supply device; if the channel door is closed, the device can be water-cooled and air-cooled through the water supply device and ventilation duct. When the hydraulic oil temperature drops from a high temperature to a low temperature, the water supply device is turned off, and the cooling water in the shell can be stored through the return water device for recycling. This invention can automatically switch between air cooling and water cooling of the hydraulic oil by monitoring the hydraulic oil temperature. It can select a single cooling method or select air cooling and water cooling simultaneously, and can also control the working efficiency of the air cooling and water cooling systems to keep the hydraulic oil temperature within a controllable range. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of the composite cooling device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the composite cooling device according to an embodiment of the present invention (another view). Figure 3 This is a left sectional view of the composite cooling device according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a passageway door according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the monitoring and control system according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the control logic of an embodiment of the present invention; In the diagram: 1-shell, 101-inlet, 102-outlet, 103-water inlet, 104-water outlet, 105-return outlet, 106-inlet tube sheet, 107-outlet tube sheet, 108-channel, 2-flow tube bundle, 3-ventilation duct, 4-channel door, 401-connector, 402-sealing mechanism, 5-water supply device, 6-return device, 601-return container, 602-first valve, 603-second valve, 7-air supply device, 8-monitoring and control system, 801-control module, 802-measurement module, 803-alarm module. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0018] Example 1 like Figures 1 to 5 As shown, this embodiment 1 provides a composite cooling device for a hydraulic oil system, comprising: The housing 1 has an inlet 101 and an outlet 102 for hydraulic oil, an inlet 103, an outlet 104, and a return 105 for cooling water, an inlet tube sheet 106 and an outlet tube sheet 107 for hydraulic oil, and a channel 108. A flow tube bundle 2 comprises multiple parallel heat exchange tubes, one end of which is connected to the inlet 101 via the inlet tube sheet 106, and the other end is connected to the outlet 102 via the outlet tube sheet 107. The flow tube bundle 2 is connected to the housing 1 and the inlet tube sheet 106 and outlet tube sheet 105. 07 forms a cooling water channel, which is connected to the inlet 103, outlet 104, and return outlet 105. Hydraulic oil flows into the flow tube bundle 2 in the composite cooling device through the inlet 101 and inlet tube sheet 106. The hydraulic oil dissipates heat through the flow tube bundle 2 and then flows out of the composite cooling device through the outlet tube sheet 107 and outlet 102. Cooling water flows into the cooling water channel through the inlet 103 to convectively cool the flow tube bundle 2 and then flows out of the cooling water channel through the outlet 104.

[0019] In this embodiment, the composite cooling device further includes a ventilation duct 3, which runs through both sides of the housing 1 and communicates with the outside, and is arranged in a cross-flow configuration with the flow tube bundle 2.

[0020] Preferably, the ventilation duct 3 is a vertical duct. When the temperature of the hydraulic oil in the flow tube bundle 2 rises, the gas in the ventilation duct 3 absorbs heat and its temperature rises, resulting in a decrease in density and buoyancy. This causes natural convection with the outside air, thereby providing natural convection heat dissipation for the device.

[0021] In this embodiment, the composite cooling device further includes a channel door 4, which is installed on the channel 108 and is used to close the channel 108; Preferably, the passage door 4 is configured to open from both sides, and there is a sealing mechanism 402 between the passage door 4 and the housing 1. The passage door 4 is connected to the passage 108 via a connector 401.

[0022] Optionally, the passage door 4 can be a revolving door, a sliding door, a roller shutter door, or a cover.

[0023] Preferably, the ventilation duct 3 is located at the end where the liquid inlet 101 of the housing 1 is located, and the channel door 4 is located at the end where the liquid outlet 102 of the housing 1 is located. When the hydraulic oil temperature is lower than the first preset temperature, the channel door 4 is closed, and the cooling device is cooled by natural convection only through the gas in the ventilation duct 3. When the hydraulic oil temperature rises to a level higher than the first preset temperature but lower than the third preset temperature, the channel door 4 is opened, and the gas flows through the channel door 4 into the housing 1, where the flow tube bundle 2 is cooled by airflow. When the hydraulic oil temperature rises to a level higher than the third preset temperature but lower than the fourth preset temperature, the channel door 4 is closed, and the flow tube bundle 2 is cooled by water through cooling water.

[0024] In this embodiment, the composite cooling device further includes a water supply device 5, which is connected to the water inlet 103. The water supply device 5 is used to provide cooling water and regulate the flow rate of the cooling water. When the water supply device 5 is working, the cooling water flows in the cooling water channel to achieve water cooling heat dissipation of the flow tube bundle 2. The cooling effect of the water cooling system can be controlled by regulating the flow rate of the cooling water through the water supply device 5.

[0025] Preferably, the water supply device 5 is equipped with a filter to filter the cooling water, preventing impurities in the cooling water from damaging the device or affecting the heat dissipation effect.

[0026] In this embodiment, when the composite cooling device is not working, the channel door 4 is closed, which can prevent the airflow from blowing dust onto the flow tube bundle 2 and prevent the accumulation of dust from affecting the heat dissipation effect of the flow tube bundle 2. When the composite cooling device is working, if the channel door 4 is open, the flow tube bundle 2 can be air-cooled; if the channel door 4 is closed, the flow tube bundle 2 can be water-cooled through the water supply device 5. At the same time, the fluid in the shell 1 is air-cooled through the ventilation pipe 3, so that air cooling and water cooling can be carried out simultaneously.

[0027] In this embodiment, the composite cooling device further includes a water return device 6, which includes a water return container 601, a first valve 602, and a second valve 603. The water return container 601 is connected to the water return port 105 through the first valve 602, and the water return container 601 is connected to the water inlet 103 through the second valve 603.

[0028] Preferably, the volume of the return water container 601 is greater than the difference between the volume of the shell 1 and the volume of the flow tube bundle 2, and a water pump is installed at the second valve 603; when the water supply device 5 stops working, the first valve 602 is opened, and cooling water flows into the return water container 601 through the return water port 105. When the water level of the cooling water in the shell 1 is zero, the first valve 602 is closed.

[0029] Preferably, when the water supply device 5 is turned on for the next time, the second valve 603 is opened, and the water in the return water container 601 is drawn into the cooling water inlet 103 by the water pump.

[0030] In this embodiment, the composite cooling device further includes a monitoring and control system 8, comprising a control module 801, a measurement module 802, and an alarm module 803. The control module 801 has preset temperatures for the hydraulic oil: a first preset temperature, a second preset temperature, a third preset temperature, and a fourth preset temperature. The measurement module 802 measures the operating parameters of the cooling device, including the hydraulic oil temperature, cooling water flow rate, and cooling water level inside the housing 1. The data from the measurement module 802 is uploaded to the control module 801 in real time, and the control module 801 controls the activation of the water supply device 5. The control module 801 controls the flow rate of cooling water; when the hydraulic oil temperature rises to a level higher than the first preset temperature but lower than the third preset temperature, the control module 801 opens the channel door 4; when the hydraulic oil temperature rises to a level higher than the third preset temperature but lower than the fourth preset temperature, the control module 801 closes the channel door 4 and controls the water supply device 5 to operate; when the hydraulic oil temperature drops to a level lower than the second preset temperature, the control module 801 controls the water supply device 5 to close, opens the first valve 602 of the return water device 6, and opens the channel door 4 when the water level of the cooling water in the housing 1 is zero. Preferably, the passage door 4 is a sliding door or roller shutter door that can be opened along the direction of gravity. When the water supply device 5 stops working, the control module 801 opens the first valve 602, and the cooling water flows into the return water container 601 through the return water port 105. The control module 801 controls the opening of the passage door 4 and controls the opening height of the passage door 4 to not exceed the cooling water level in the housing 1.

[0031] When the hydraulic oil temperature is higher than the fourth preset temperature, the control module (801) controls the alarm module (803) to issue an alarm signal and controls the hydraulic system to stop working.

[0032] Optionally, the composite cooling device further includes an air supply device 7, which is located on the side of the housing 1; Optionally, an air supply device 7 may be provided at the opening of the ventilation duct 3. The air supply device 7 can increase the gas flow rate in the ventilation duct 3 and enhance the cooling efficiency of the ventilation duct 3 for the device.

[0033] Optionally, an air supply device 7 can be provided at the opening of the passage door 4. The air supply device 7 can increase the gas flow rate inside the housing 1 and enhance the cooling efficiency of the flow tube bundle 2 by air cooling inside the housing 1. When the hydraulic oil temperature is higher than the first preset temperature and lower than the third preset temperature, the control module 801 opens the passage door 4 and controls the air supply device 7 to work. When the hydraulic oil temperature drops to below the first preset temperature, the control module 801 controls the air supply device 7 to close, thus closing the passage door 4.

[0034] Preferably, the air supply device 7 is equipped with a filter to filter the introduced airflow and prevent impurities in the gas from damaging the device or affecting the heat dissipation effect.

[0035] Example 2 like Figure 6 As shown, this embodiment 2 provides a control method for a hydraulic system composite cooling device, specifically as follows: S101: The hydraulic oil temperature t is measured by the measurement module 802. i ; S102: When t i When the temperature rises to a level higher than the first preset temperature t1 and lower than the third preset temperature t3, the control module 801 opens the channel door 4 and controls the air supply device 7 to work, and the airflow blown in by the air supply device 4 performs forced air cooling and convection heat dissipation on the flow tube bundle 2. S103: When t i When the temperature rises to a level higher than the third preset temperature t3 but lower than the fourth preset temperature t4, the control module 801 closes the channel door 4 and controls the water supply device 5 to work, so that the cooling water can perform water-cooled convection heat dissipation on the flow tube bundle 2. At this time, water-cooled heat dissipation and air-cooled heat dissipation can be carried out simultaneously. S104: When t i When the temperature exceeds the fourth preset temperature t4, the control module 801 controls the alarm module 803 to issue an alarm signal and controls the hydraulic system to stop working. S105: When t i When the temperature drops below the second preset temperature t2, the control module 801 controls the water supply device 5 to close and opens the first valve 602 of the return water device 6 to introduce the cooling water in the shell 1 into the return water container 601 for storage. When the water level of the cooling water in the shell 1 is zero, all the cooling water in the shell 1 flows into the return water container 601, the first valve 602 is closed, and the channel door 4 is gradually opened. At this time, the cooling method of the composite cooling device changes from water cooling to air cooling. S106: When t iWhen the temperature drops below the first preset temperature t1, the control module 801 controls the air supply device 7 to shut down and closes the channel door 4. At this time, the hydraulic oil temperature is low, and the device can be cooled by airflow through the ventilation duct 3.

[0036] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A composite cooling device for a hydraulic oil system, characterized in that, include: The housing (1) is provided with a hydraulic oil inlet (101) and outlet (102), a cooling water inlet (103), an outlet (104) and a return water inlet (105), a hydraulic oil inlet tube sheet (106) and an outlet tube sheet (107), and a channel (108). A flow tube bundle (2) comprises multiple parallel heat exchange tubes. One end of each heat exchange tube is connected to the liquid inlet (101) via the inlet tube sheet (106), and the other end is connected to the liquid outlet (102) via the outlet tube sheet (107). The flow tube bundle (2), together with the shell (1), the inlet tube sheet (106), and the outlet tube sheet (107), forms a cooling water channel. The cooling water channel is connected to the water inlet (103), the water outlet (104), and the return water outlet (105). Ventilation duct (3) runs through both sides of the housing (1) and communicates with the outside; A passage door (4) is installed on the passage (108) to close the passage (108). Water conveying device (5), which is connected to the water inlet (103); The water return device (6) includes a water return container (601), a first valve (602) and a second valve (603). The water return container (601) is connected to the water return port (105) through the first valve (602), and the water return container (601) is connected to the water inlet (103) through the second valve (603). The monitoring and control system (8) includes a control module (801), a measurement module (802), and an alarm module (803); the control module (801) has preset first, second, third, and fourth preset temperatures for hydraulic oil; the measurement module (802) is used to measure the operating parameters of the cooling device, which include hydraulic oil temperature, cooling water flow rate, and cooling water level in the housing (1); the data from the measurement module (802) is uploaded to the control module (801) in real time. When the hydraulic oil temperature rises to a level higher than the first preset temperature but lower than the third preset temperature, the control module (801) opens the passage door (4). When the hydraulic oil temperature rises to a level higher than the third preset temperature but lower than the fourth preset temperature, the control module (801) closes the channel door (4) and controls the water conveying device (5) to operate. When the hydraulic oil temperature drops below the second preset temperature, the control module (801) controls the water supply device (5) to close and opens the first valve (602) of the return water device (6). When the water level of the cooling water in the housing (1) is zero, the passage door (4) is opened. When the hydraulic oil temperature is higher than the fourth preset temperature, the control module (801) controls the alarm module (803) to issue an alarm signal and controls the hydraulic system to stop working.

2. The composite cooling device according to claim 1, characterized in that, The ventilation duct (3) is a vertical duct.

3. The composite cooling device according to claim 2, characterized in that, The ventilation duct (3) is located at the end of the liquid inlet (101) of the housing (1).

4. The composite cooling device according to claim 3, characterized in that, The passage door (4) is configured to open from both sides, and there is a sealing mechanism (402) between the passage door (4) and the housing (1).

5. The composite cooling device according to claim 4, characterized in that, The channel door (4) is located at the end of the liquid outlet (102) of the housing (1).

6. The composite cooling device according to claim 5, characterized in that, It also includes an air supply device (7) that supplies air to the channel (108) and / or the ventilation duct (3).

7. The composite cooling device according to claim 6, characterized in that, When the hydraulic oil temperature rises above the first preset temperature but below the third preset temperature, the control module (801) controls the air supply device (7) to work; when the hydraulic oil temperature drops below the first preset temperature, the control module (801) controls the air supply device (7) to shut down and close the passage door (4).

8. A control method for a hydraulic system composite cooling device, used in the cooling device as described in any one of claims 1 to 7, characterized in that, Includes the following steps, S101: The hydraulic oil temperature t is measured by the measuring module (802). i ; S102: When t i When the temperature rises to a level higher than the first preset temperature t1 and lower than the third preset temperature t3, the control module (801) opens the channel door (4) and controls the air supply device (7) to operate. S103: When t i When the temperature rises to a level higher than the third preset temperature t3 but lower than the fourth preset temperature t4, the control module (801) closes the channel door (4) and controls the water conveying device (5) to operate. S104: When t i When the temperature exceeds the fourth preset temperature t4, the control module (801) controls the alarm module (803) to issue an alarm signal and controls the hydraulic system to stop working; S105: When t i When the temperature drops below the second preset temperature t2, the control module (801) controls the water supply device (5) to close and opens the first valve (602) of the return water device (6). When the water level of the cooling water in the shell (1) is zero, the channel door (4) is opened. S106: When t i When the temperature drops below the first preset temperature t1, the control module (801) controls the air supply device (7) to shut down and close the channel door (4).

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