Compact independent recirculating water chiller

Abstract

The utility model provides a compact independent circulating water cooler relates to heat transfer equipment technical field, including oil tank, the inside heating unit of oil tank is provided with, circulating pump unit, circulating pump unit includes oil pump, and the oil suction of oil pump is connected with oil tank through pipeline, still include filter branch and cooler branch who sets up in series, filter branch is connected with the oil outlet of circulating pump unit through pipeline, and cooler branch is connected with oil tank to form closed lubricating oil circulation loop, and the external filter is connected in series in filter branch, and the cooler of water -cooled type is connected in series in cooler branch, the utility model is provided with bypass protection unit to can open bypass in system cold start or oil temperature is too low, viscosity is sharply increased and makes oil pressure exceed preset threshold value instantaneous automatic, makes high pressure oil liquid bypass, thereby effectively protected filter and cooler core body from high pressure impact damage, and reduced oil pump's starting load and overload risk.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange equipment technology, and in particular to a compact independent circulating water cooler. Background Technology

[0002] In heavy equipment such as large machine tools, stamping production lines, and heavy-duty gearboxes, high-viscosity, heavy-duty lubricating oil is a key medium for maintaining stable operation. To achieve optimal lubrication performance, the oil temperature must typically be controlled within the range of 40-45°C. This temperature range represents an ideal balance point for several key parameters, including lubricating oil viscosity, lubrication performance, and oxidation stability. If the oil temperature falls below this range, the oil viscosity will increase exponentially and nonlinearly, leading to a sharp deterioration in its fluidity. This not only increases the friction loss and local pressure drop in the pipeline system but also directly causes the motor driving the oil pump to overload, overheat, or even burn out due to a surge in load torque. Simultaneously, the resulting abnormally high-pressure shock waves can easily cause structural crushing damage to the paper or sintered metal filter elements in precision filters. It may also lead to cracking of internal welds and seal failure in plate or tube-fin coolers, resulting in leaks. Conversely, if the oil temperature remains above this range for an extended period, the oil viscosity will decrease excessively, making it difficult to form a sufficiently strong load-bearing oil film, leading to lubrication failure and increased wear. More seriously, high temperatures will greatly accelerate the thermal oxidation of the base oil and the decomposition of additives, rapidly generating sludge, gum, and acidic substances. This not only degrades oil performance and shortens oil change intervals, but these contaminants will also further clog filter elements and wear components, creating a vicious cycle that ultimately seriously threatens the operational reliability, safety, and life-cycle economy of the entire heavy equipment system.

[0003] Existing oil temperature control devices typically include heaters, coolers, constant-speed circulating oil pumps, and filters. However, in practical applications, especially when dealing with high-viscosity oils, they have certain technical drawbacks: First, during cold starts or in low-temperature environments, the oil viscosity increases sharply, severely deteriorating its fluidity. When the oil flows through the complex internal channels of the filter and cooler, it generates significant flow resistance, causing a sudden surge in system pressure. This high-pressure impact can easily cause structural crushing of the filter element, failure of cooler welds or seals, and force the oil pump motor to operate under overload, posing a risk of burnout. Current solutions often rely on increasing the system's pressure rating or installing simple relief valves. However, the former increases cost and size, while the latter, although it can relieve pressure, interrupts normal circulation, failing to achieve a balance between pressurized start-up and component protection.

[0004] In other words, there is still room for improvement in the existing technology, and there is an urgent need for an oil temperature regulating heat exchanger device that can solve the above problems. Utility Model Content

[0005] This invention overcomes the shortcomings of the prior art and provides a compact, independent circulating water cooler with the advantages of high safety and long service life.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: A compact, independent circulating water cooler includes an oil tank, the oil tank having a heating unit disposed inside the oil tank; A circulating pumping unit, comprising an oil pump, wherein the oil pump's suction port is connected to the oil tank via a pipeline; It also includes a filter branch and a cooler branch arranged in series. The filter branch is connected to the oil outlet of the circulating pump unit through a pipeline, and the cooler branch is connected to the oil tank to form a closed lubricating oil circulation loop. An external filter is connected in series in the filter branch, and a water-cooled cooler is connected in series in the cooler branch. It also includes a bypass protection unit, which includes a first bypass connected in parallel at both ends of the filter branch and a second bypass connected in parallel at both ends of the cooler branch. A first check valve is provided on the first bypass and a second check valve is provided on the second bypass. The first check valve and the second check valve are activated when the oil pressure in their respective branches exceeds a preset opening pressure. The cooler is fixedly installed on the outer side of the oil tank, and forms a heat dissipation gap for air circulation between it and the outer wall of the oil tank assembly.

[0007] Furthermore, the opening pressure of the first check valve and the second check valve is set to 3 bar to 7 bar.

[0008] Furthermore, in the oil circuit system composed of the circulating pumping unit, filter branch, cooler branch, first bypass, and second bypass, the diameter of the main pipeline is larger than that of a conventional hydraulic oil circuit system under the same rated flow.

[0009] Furthermore, the heating unit is an electric heating rod disposed in the oil tank.

[0010] Furthermore, the circulating pumping unit also includes an oil suction filter disposed at the front end of the oil pump suction port.

[0011] Furthermore, the oil pump's suction port is connected to the oil tank via an oil inlet pipe, and the oil suction filter is installed on the oil inlet pipe; the cooler's oil outlet is connected to an oil outlet pipe; The oil inlet pipe is connected to the first corner near the oil tank, and the oil outlet pipe is connected to the second corner near the oil tank. The second corner and the first corner are arranged opposite each other along the diagonal direction of the oil tank.

[0012] Furthermore, it also includes at least one pair of mounting brackets fixedly disposed on the outer wall of the oil tank, the cooler being fixed by the mounting brackets, and the heat dissipation gap being formed between the cooler and the outer wall of the oil tank and between the mounting brackets.

[0013] Furthermore, the oil tank is provided with a system oil inlet and a system oil return port; the system oil inlet is located on the side wall of the oil tank near a bottom corner, and the system oil return port is located on the top of the oil tank near a diagonal corner.

[0014] Furthermore, a pressure detection instrument is installed on the pipeline between the oil pump outlet and the external filter.

[0015] Compared with the prior art, the beneficial effects of this utility model are: This invention incorporates a bypass protection unit, which automatically activates the bypass when the system is cold-started or the oil temperature is too low or the viscosity increases sharply, causing the oil pressure to exceed a preset threshold. This allows the high-pressure oil to bypass the bypass, effectively protecting the filter and cooler core from high-pressure impact damage, reducing the starting load and overload risk of the oil pump, and extending its service life. Simultaneously, by fixing the water-cooled cooler to the side of the oil tank with a specific heat dissipation gap, a compact, integrated layout is formed, saving installation space. It also cleverly utilizes air convection to provide auxiliary heat dissipation for the cooler and oil tank walls, improving the overall heat dissipation efficiency of the system. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and, together with the embodiments of the present invention, are used to explain the present invention. They do not constitute a limitation thereof. In the drawings: Figure 1 This utility model describes a three-dimensional compact independent circulating water cooler. Figure 1 ; Figure 2 This utility model describes a three-dimensional compact independent circulating water cooler. Figure 2 ; Figure 3 This is a top view of the compact independent circulating water cooler described in this utility model; Figure 4 This is a side view of the compact independent circulating water cooler described in this utility model.

[0017] In the diagram: 1. Oil tank; 2. Heating unit; 3. Oil pump; 4. External filter; 5. Cooler; 6. First bypass; 7. Second bypass; 8. First check valve; 9. Second check valve; 10. Heat dissipation gap; 11. Oil inlet pipe; 12. Oil outlet pipe; 13. Mounting bracket; 14. System oil inlet; 15. System oil return port; 16. Pressure detection instrument. Detailed Implementation

[0018] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0019] like Figures 1 to 4 As shown, this utility model claims protection for a compact, independent circulating water cooler for temperature control of high-viscosity lubricating oil. It includes an oil tank 1, a circulating pump unit, a filter and cooling assembly, and a bypass protection unit, forming a closed, independent circulation system. The oil tank 1 is the core of the entire system for oil storage and heat exchange. A heating unit 2, typically an immersion electric heating rod, is installed on its internal sidewall to preheat the oil in low ambient temperatures or during system startup, thereby reducing its initial viscosity.

[0020] The circulating pumping unit provides the system with circulating power and includes an oil pump 3. The oil pump 3's suction port is connected to the oil tank 1 via a suction pipe, pumping out the oil. A filtration and cooling assembly is connected in series in the downstream oil circuit of the circulating pumping unit, mainly consisting of two series branches: a filter branch and a cooler branch 5. In the filter branch, an external filter 4, such as a high-pressure pipeline filter, is installed in series to finely filter the oil pumped by the oil pump 3. In the cooler branch 5, a water-cooled cooler 5, such as a plate heat exchanger or a shell-and-tube heat exchanger, is installed in series. Its internal flow channels exchange heat with externally supplied cooling water to remove heat from the oil. The filtered and cooled oil finally returns to the oil tank 1 through the return oil pipe, forming a complete internal circulation loop for the lubricating oil.

[0021] The present invention is further characterized by the inclusion of a bypass protection unit, comprising two independent bypass oil circuits: a first bypass 6 connected in parallel to both ends of the external filter 4, on which a first check valve 8 is installed; and a second bypass 7 connected in parallel to both ends of the cooler 5, on which a second check valve 9 is installed. The first check valve 8 and the second check valve 9 can be either hydraulically controlled check valves or spring-loaded overflow check valves. The purpose is that the valves will only be opened when the oil pressure in their respective branches exceeds a preset opening pressure, allowing oil to flow through the bypass. This design helps solve the problem of poor fluidity and excessive resistance of high-viscosity oil flowing through the filter and cooler at low temperatures. During cold starts, high-pressure oil will preferentially open the check valves and bypass the flow, thereby protecting the filter element and cooler core from high-pressure impacts, while significantly reducing the starting load on the oil pump 3.

[0022] In terms of structural layout, in pursuit of compactness, the water-cooled cooler 5 is fixedly installed on the external side of the oil tank 1 by means of brackets or other methods. A specific heat dissipation gap 10 is maintained between the cooler 5 and the outer wall of the oil tank 1. This not only facilitates installation and maintenance, but also allows natural air convection, which can dissipate heat from the surface of the cooler 5 and the vicinity of the oil tank 1 wall in a timely manner, preventing heat accumulation and causing local high temperatures, thereby improving the heat dissipation efficiency and reliability of the entire system.

[0023] In this embodiment, the opening pressure of the first check valve 8 and the second check valve 9 is preferably set between 3 bar and 7 bar. This pressure range is the preferred value that takes into account both protection sensitivity and pressure fluctuation during normal system operation. If the pressure setting is too low, the valve may open erroneously during normal operation, and if it is too high, the protection function may be lost.

[0024] To address the high flow resistance of high-viscosity oils, this invention incorporates a low-flow-resistance design for the entire oil circuit system. Specifically, the diameters of all main pipelines forming the circulation loop, including the inlet pipe 11, outlet pipe 12, and the pipes connecting various components, have been enlarged. Their design standard is larger than the pipe diameters in conventional hydraulic systems using ordinary low-viscosity hydraulic oils or lubricating oils under the same rated flow requirements. For example, the diameter can be increased by one to two grade levels. This large-diameter design effectively reduces the frictional resistance of the oil, minimizes system pressure loss, and is particularly beneficial for improving low-temperature starting performance and reducing pump load.

[0025] In this embodiment, the heating unit 2 is an electric heating rod with adjustable power. The start and stop of the heating unit 2 can be automatically controlled by a thermostat installed on the oil tank 1 to maintain the oil temperature above a minimum start-up temperature.

[0026] In order to perform coarse filtration before the oil enters the oil pump 3 to protect the pump body, an oil suction filter can also be installed at the front end of the oil suction port of the oil pump 3 and in the oil suction pipeline.

[0027] Specifically, the oil pump 3's suction port is connected to the inside of the oil tank 1 via an oil inlet pipe 11. An oil suction filter can be connected in series with this oil inlet pipe 11, and the cooler 5's oil outlet is connected to an oil outlet pipe 12 to guide the processed oil back to the oil tank 1.

[0028] To ensure thorough agitation and circulation of the oil within tank 1 and prevent dead zones, the opening of the inlet pipe 11 is positioned near the first corner of tank 1, while the opening of the outlet pipe 12 is positioned near the second corner. These two corners are located diagonally opposite each other along the rectangular shape of tank 1. For example, the opening of the inlet pipe 11 could be near the lower left corner of tank 1, while the opening of the outlet pipe 12 could be near the upper right corner. This arrangement ensures that the oil intake and return points are diagonally opposite each other. The oil is pumped out from one corner, circulates externally, and then returns diagonally, forming the longest convection path through the entire tank space. This significantly promotes macroscopic flow of the oil within the tank and ensures uniformity of temperature and impurities.

[0029] In addition, to ensure the stable installation of the cooler 5 and the heat dissipation gap 10, at least one pair of mounting brackets 13 are welded or bolted to the outer wall of the oil tank 1, and the cooler 5 is fastened to these mounting brackets 13. Thus, the space between the cooler 5 body and the outer wall of the oil tank 1, as well as the space between the two mounting brackets 13, together constitute the aforementioned heat dissipation gap 10, which is simple and reliable in structure.

[0030] As an independent cooling device, oil tank 1 needs to be connected to the main equipment being lubricated. Therefore, a system oil inlet 14 and a system oil return port 15 are provided on oil tank 1. The system oil inlet 14 is located on the side wall of oil tank 1, near a bottom corner. This low-position design ensures that even if the oil level in the main equipment's oil tank is low, the return oil can flow smoothly under gravity. The system oil return port 15 is located on the top panel of oil tank 1, near the top corner diagonally opposite the bottom corner of the oil inlet 14. This high-low diagonal arrangement is similar to the principle of the internal circulation oil inlet and return pipe arrangement, which helps to further optimize the large-scale oil circulation path and is beneficial for heat dissipation.

[0031] To monitor the core pressure of the system in real time, a pressure detection instrument 16, such as a pressure gauge or pressure sensor, is installed on the high-pressure pipeline between the oil outlet of oil pump 3 and the oil inlet of external filter 4. Operators can intuitively judge the system status through the reading of the pressure detection instrument 16, which facilitates inspection and maintenance.

[0032] This invention incorporates a bypass protection unit, which automatically activates the bypass when the system is cold-started or the oil temperature is too low or the viscosity increases sharply, causing the oil pressure to exceed a preset threshold. This allows the high-pressure oil to bypass the bypass, effectively protecting the filter and cooler core from high-pressure impact damage and reducing the starting load and overload risk of the oil pump. Simultaneously, by fixing the water-cooled cooler to the side of the oil tank with a specific heat dissipation gap, a compact integrated layout is formed, saving installation space. Furthermore, it cleverly utilizes air convection to provide auxiliary heat dissipation for the cooler 5 and the oil tank wall 1, improving the overall heat dissipation efficiency of the system.

[0033] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A compact, independent circulating water cooler, characterized in that, Includes an oil tank (1), and a heating unit (2) is provided inside the oil tank (1); The circulating pumping unit includes an oil pump (3), and the oil suction port of the oil pump (3) is connected to the oil tank (1) through a pipeline; It also includes a filter branch and a cooler (5) branch arranged in series. The filter branch is connected to the oil outlet of the circulating pump unit through a pipeline, and the cooler (5) branch is connected to the oil tank (1) to form a closed lubricating oil circulation loop. An external filter (4) is connected in series in the filter branch, and a water-cooled cooler (5) is connected in series in the cooler (5) branch. It also includes a bypass protection unit, which includes a first bypass (6) connected in parallel at both ends of the filter branch and a second bypass (7) connected in parallel at both ends of the cooler (5) branch. A first check valve (8) is provided on the first bypass (6) and a second check valve (9) is provided on the second bypass (7). The first check valve (8) and the second check valve (9) are activated when the oil pressure in their respective branches exceeds the preset opening pressure. The cooler (5) is fixedly installed on the outer side of the oil tank (1) and forms a heat dissipation gap (10) between it and the outer wall of the oil tank (1) assembly for air circulation.

2. The compact independent circulating water cooler according to claim 1, characterized in that, The opening pressure of the first check valve (8) and the second check valve (9) is set to 3 bar to 7 bar.

3. The compact independent circulating water cooler according to claim 1, characterized in that, In the oil circuit system composed of the circulating pumping unit, filter branch, cooler (5) branch, first bypass (6) and second bypass (7), the main pipeline diameter is larger than that of a conventional hydraulic oil circuit system with the same rated flow.

4. The compact independent circulating water cooler according to claim 1, characterized in that, The heating unit (2) is an electric heating rod installed in the oil tank (1).

5. The compact independent circulating water cooler according to claim 1, characterized in that, The circulating pumping unit also includes an oil suction filter disposed at the front end of the oil suction port of the oil pump (3).

6. The compact independent circulating water cooler according to claim 5, characterized in that, The oil pump (3) has its suction port connected to the oil tank (1) via an oil inlet pipe (11), and the oil suction filter is installed on the oil inlet pipe (11); the cooler (5) has its oil outlet connected to an oil outlet pipe (12). The oil inlet pipe (11) is connected to the first corner near the oil tank (1), and the oil outlet pipe (12) is connected to the second corner near the oil tank (1). The second corner and the first corner are arranged opposite to each other along the diagonal direction of the oil tank (1).

7. The compact independent circulating water cooler according to claim 1, characterized in that, It also includes at least one pair of mounting brackets (13) fixedly disposed on the outer wall of the oil tank (1), the cooler (5) is fixed by the mounting brackets (13), and the heat dissipation gap (10) is formed between the cooler (5) and the outer wall of the oil tank (1) and between the mounting brackets (13).

8. The compact independent circulating water cooler according to claim 1, characterized in that, The oil tank (1) is provided with a system oil inlet (14) and a system oil return port (15); the system oil inlet (14) is located on the side wall of the oil tank (1) near a bottom corner, and the system oil return port (15) is located on the top of the oil tank (1) near a diagonal corner.

9. The compact independent circulating water cooler according to claim 1, characterized in that, A pressure detection instrument (16) is installed on the pipeline between the oil pump (3) outlet and the external filter (4).

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