Efficient anti-oil-leakage oil groove and refrigerating system comprising same

Abstract

The utility model discloses an efficient anti-oil-leakage oil groove and a refrigerating system comprising the same, which are characterized by comprising an oil groove main body for storing lubricating oil; an oil supply port, an oil return port and at least one air return port are formed in the oil groove main body; the flow equalizing plate and the filter screen are sequentially positioned at the downstream of the oil return port in the oil tank main body; the gas uniformizing plate is positioned above the filter screen and right below the gas return port; at least one oil heating rod; and the at least one injection oil return pipe is connected with the oil groove main body and is used for injecting the liquid oil and refrigerant mixture accumulated at the bottom of the compressor and in the evaporator back into the oil groove main body. The problems that in the prior art, an oil groove is single in function and prone to oil leakage are solved, and oil leakage from an oil system to a refrigerating system is reduced.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration, and in particular to a high-efficiency oil tank for centrifuge units that prevents oil leakage and a refrigeration system including the oil tank. Background Technology

[0002] In the refrigeration field, the oil sump is installed in the compressor bearing lubrication system. Under the action of the internal oil pump, the lubricating oil is pressed into the compressor bearing cavity through the oil supply pipe to lubricate the bearing, and then flows back to the oil sump through the oil return pipe.

[0003] Existing oil tank designs typically only provide basic oil supply and return functions, lacking effective management of oil mist and refrigerant gas. This design cannot effectively prevent lubricating oil from being carried away through the return gas pipe, leading to oil leakage and consequently affecting the efficiency and reliability of the entire refrigeration system.

[0004] Because the compressor motor cavity and bearing cavity cannot be completely isolated, refrigerant from the refrigeration system will often leak into the oil pan. The flashing of the refrigerant in the oil pan will generate a large amount of refrigerant gas, causing oil mist to be carried away through the return pipe in the oil system, resulting in oil leakage. Oil leakage not only increases maintenance costs but can also lead to compressor bearing damage due to insufficient oil levels.

[0005] The existing oil tank lacks effective oil level monitoring methods and cannot promptly alarm when the oil level drops, which may cause the oil pump motor to run in an idling state, increasing the wear and tear and failure risk of the equipment. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a high-efficiency oil tank for centrifuge units and a refrigeration system including the oil tank, thereby solving the problems of single function and easy oil leakage of oil tanks in the prior art and reducing the oil leakage from the oil system to the refrigeration system.

[0007] It can also monitor oil level and trigger an alarm when the oil level is low to ensure the compressor's lubrication efficiency.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0009] A high-efficiency oil spill prevention tank, characterized in that it comprises:

[0010] An oil tank body is provided for storing lubricating oil; an oil supply port is provided on the oil tank body for delivering lubricating oil to the compressor bearing cavity, an oil return port is provided for returning the lubricated oil to the oil tank body, and at least one gas return port is provided for allowing gaseous refrigerant to flow out to the evaporator.

[0011] The flow equalization plate and the filter screen are located sequentially downstream of the oil return port inside the oil tank body, and are used to filter the oil mist carried by the gaseous refrigerant.

[0012] A distribution plate is located above the filter screen and directly below the air return port;

[0013] At least one oil heating rod is installed inside the oil tank body for heating the oil in the oil tank;

[0014] At least one ejector return line is connected to the oil tank body for ejecting the liquid oil and refrigerant mixture accumulated at the bottom of the compressor and in the evaporator back into the oil tank body.

[0015] In the above technical solution, the oil tank body includes a shell containing an inner cavity and end caps located at both ends of the shell, and the shell and end caps are combined in a sealed structure.

[0016] In the above technical solution, the ejector return pipe includes an interconnected suction chamber and a mixing chamber; the narrow end of the nozzle-shaped working inlet extends into the suction chamber, and the wide end is connected to the top of the condenser; the suction chamber is provided with an ejector inlet, which is connected to the bottom of the evaporator; the mixing chamber is connected to the oil tank body through the outlet end.

[0017] In the above technical solution, the gas distribution plate has no holes or few holes in the middle directly opposite the return air port, and the size of the surrounding holes increases from near to far.

[0018] In the above technical solution, the return air port is located at the top center of the housing.

[0019] In the above technical solution, the oil supply port is connected to the oil pump motor.

[0020] In the above technical solution, a sight glass for observing the oil level is also installed on the main body of the oil tank. The sight glass is located below the filter screen and the oil level observation range covers a preset position.

[0021] In the above technical solution, an oil level switch is also installed on the main body of the oil tank to trigger an alarm when the oil level drops to a preset position.

[0022] In the above technical solution, dual heating rods are installed to keep the oil tank temperature higher than the refrigerant temperature in the system.

[0023] In the above technical solution, the design of the flow equalization plate can throttle the liquid refrigerant, realize the separation of primary refrigerant gas and liquid oil, and at the same time, it can distribute the return oil evenly.

[0024] In the above technical solution, the oil tank body also includes a baffle, which is used to fix the ejector return oil pipe so that the ejected liquid refrigerant splashes down evenly.

[0025] A refrigeration system, characterized in that it includes a high-efficiency oil spill prevention tank as described in any one of the above claims.

[0026] Key improvements of this invention include the filter screen effectively separating refrigerant gas and oil mist, the gas distribution plate uniformly distributing gas flow rate, and the flow distribution plate achieving separation of refrigerant gas and liquid oil and uniform distribution of return oil.

[0027] In addition, this utility model also provides a variety of alternative solutions, such as different forms of gas equalization plates, filter screens of various materials, and different liquid level control methods, to adapt to different application needs.

[0028] The air distribution plate is characterized by fewer openings in the middle and more air intakes on both sides. The opening structure is not limited and can be triangular, rectangular, etc.

[0029] The filter material remains the same, and can be metal wire mesh, PVC, etc.

[0030] The flow equalization plate has no structural limitations; it can be a solid structure, a spliced ​​structure, or other shapes.

[0031] Multiple return air ports can be installed.

[0032] The liquid level control method is not limited; it can be an electronic liquid level switch or a mechanical float valve.

[0033] The level switch is installed at the same level as the sight glass. When the oil level is just out of sight, the level switch triggers an alarm, making it easy to identify the limit oil level.

[0034] In summary, the high-efficiency oil spill prevention tank and refrigeration system of this utility model, through the combined use of filter screen, gas distribution plate, oil return ejector device and oil heating rod, reduces oil spillage, monitors oil level, triggers alarm when oil level is low, ensures compressor lubrication efficiency, and ultimately achieves a balance between oil return rate and oil spillage rate.

[0035] The dual heating rod design can heat the oil tank when the unit is shut down, always keeping the oil tank temperature higher than the refrigerant temperature in the system, preventing the gaseous refrigerant from condensing and dissolving in the oil tank, and then flashing away the oil mist when the unit is turned on.

[0036] Compared with existing technologies, this invention achieves effective separation of refrigerant gas and oil mist, improves filtration efficiency, and significantly reduces oil leakage.

[0037] This ensures that the refrigerant entering the compressor oil pan is evenly distributed with the refrigerant gas flashing in the oil pan, and is evenly filtered by the filter screen, thereby improving filtration efficiency and reducing oil leakage.

[0038] The risk of oil spillage can be reduced from the source by decreasing the dissolution of refrigerant in the oil tank.

[0039] It effectively reduces oil leakage from the oil system to the refrigeration system; the oil return device recovers the lubricating oil that has leaked into the system, achieving a balance between the oil leakage rate and the oil return rate, and preventing continuous oil leakage.

[0040] The special design of the gas equalization plate and the flow equalization plate makes the gas and liquid distribution more uniform and optimizes the working performance.

[0041] The oil level switch and dual heating rods enhance the safety and stability of the system, ensuring proper lubrication of the compressor.

[0042] It continuously monitors oil content and triggers an alarm when the oil level is low to ensure compressor lubrication efficiency. It provides automatic alarm for low oil levels and allows for easy and intuitive identification of minimum oil levels.

[0043] Overall, it improves the efficiency of the refrigeration system, reduces maintenance costs, and extends the service life of the equipment. Attached Figure Description

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0045] Figure 1 This is a schematic diagram (front view) of the main structure of the oil tank according to an embodiment of the present invention.

[0046] Figure 2 This is an exploded view of the oil tank body according to an embodiment of the present utility model.

[0047] Figure 3 This is a flowchart illustrating the working principle and process of the oil tank body of this utility model.

[0048] Figure 4 Simulation of the gaseous refrigerant filtration flow rate in the main body of the oil tank of this utility model.

[0049] Figure 5 Simulation of the flow trajectory of gaseous refrigerant in the main body of the oil tank of this utility model. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0051] like Figure 1-3As shown, the oil tank housing 120 is sealed at both ends with end caps 12. A return air port 1 is located at the top, connecting to the evaporator. A gas equalization plate 2 is positioned directly below the return air port 1, and a filter screen 3 is positioned below the gas equalization plate 2. A baffle 4 is vertically positioned below the filter screen 3, and the baffle 4 is fixed to the end caps at both ends laterally. A flow equalization plate 5 is also positioned below the filter screen 4, fixed downstream of the oil return port 6 and to one side of the end cap 12. An oil supply port 15 is located on the other side of the end cap 12 and is connected to the oil pump motor 14. A first ejector oil return pipe 7 and a second ejector oil return pipe 8 are also positioned below the filter screen 4, and are fixed to the oil tank housing 120 by the baffle 14. The first ejector oil return pipe 7 and the second ejector oil return pipe 8 are respectively connected to the ejector oil return pipeline outside the housing 120 to introduce refrigerant. The first oil heating rod 10 and the second oil heating rod 11 are fixed side by side at intervals on one end cap 12 and extend into the oil tank housing 120. A sight glass 13 is provided on one end cap 12, which is located roughly below the filter screen 3 to observe the oil level. An oil level switch 9 is provided on one end cap 12.

[0052] root root Figure 3 In the working process, lubricating oil is delivered to the compressor motor bearing cavity (not shown, located in...) through the oil supply port 15 by the oil pump motor 14. Figure 1 The oil supply port is located outside the end cover 12. After bearing lubrication, the oil flows back to the oil tank housing 120 through the return port 6 and the flow equalization plate 5.

[0053] The first ejector return oil pipe 7 and the second ejector return oil pipe 8 are of a common structure. The ejector return oil pipe includes an interconnected suction chamber and a mixing chamber. The narrow end of the nozzle-shaped working inlet extends into the suction chamber, and the wide end connects to the top of the condenser. The suction chamber is provided with an ejector inlet, which connects to the bottom of the evaporator. The mixing chamber is connected to the oil tank body through its outlet end. The nozzle-shaped working inlet connects to the top of the condenser to introduce refrigerant into the suction chamber, and after passing through the mixing chamber, its outlet end connects to the oil tank.

[0054] During unit operation, high-pressure gas at the top of the condenser flows through the working inlet to the oil tank connected to the outlet, creating a negative pressure zone in the suction chamber due to the throttling effect. The negative pressure zone draws a mixture of refrigerant and oil from the evaporator into the ejector through the ejector inlet, where it mixes with the high-pressure refrigerant gas from the condenser. The mixed refrigerant and oil then flow together into the oil tank.

[0055] The refrigerant in the system is introduced from the evaporator through the first ejector return oil pipe 7 and the second ejector return oil pipe 8, and flows into the oil tank housing 120 through the ejector return oil pipe. On the other hand, it flows back to the oil tank through the labyrinth seal gap of the compressor bearing cavity via the return oil pipe and the return oil port 6. Under the continuous heating of the first oil heating rod 10 and the second oil heating rod 11 in the oil tank housing 120, the refrigerant is flashed into gaseous refrigerant, and the pressure in the oil tank increases. The gaseous refrigerant carrying oil mist is filtered through the filter screen 3, and the oil mist is filtered back to the bottom oil tank. The gaseous refrigerant flows out to the evaporator through the gas return port 1.

[0056] The sight glass 13 enables oil level observation. When the oil level drops below the oil level switch 9, the oil pump motor 14 stops running to prevent idling.

[0057] Figure 4 and Figure 5 Through simulation calculations and actual testing, filter 3 effectively separates refrigerant gas and oil mist, preventing gaseous refrigerant from carrying lubricating oil out of the return pipe and causing oil leakage. Simulation calculations show that... Figure 4 It can be seen that the flow velocity of the refrigerant gas flashing in the oil tank is less than 0.7 m / s, which does not easily carry away the oil mist; Figure 5 It can be seen that the streamlines are evenly distributed within the oil tank, making it difficult for oil mist to concentrate and be carried away. Experimental verification showed that the oil level did not decrease significantly during the unit's one-year operation period.

[0058] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A high-efficiency oil spill prevention tank, characterized in that, include: A main body of an oil tank for storing lubricating oil; The oil tank body is provided with an oil supply port for delivering lubricating oil to the compressor bearing cavity, an oil return port for returning the lubricated oil to the oil tank body, and at least one gas return port for allowing gaseous refrigerant to flow out to the evaporator. The flow equalization plate and the filter screen are located sequentially downstream of the oil return port inside the oil tank body, and are used to filter the oil mist carried by the gaseous refrigerant. A distribution plate is located above the filter screen and directly below the air return port; At least one oil heating rod is installed inside the oil tank body for heating the oil in the oil tank; At least one ejector return line is connected to the oil tank body for ejecting the liquid oil and refrigerant mixture accumulated at the bottom of the compressor and in the evaporator back into the oil tank body.

2. The high-efficiency anti-oil spill tank according to claim 1, characterized in that, The oil tank body includes a shell containing an inner cavity and end caps located at both ends of the shell, with the shell and end caps forming a sealed structure.

3. The high-efficiency anti-oil spill tank according to claim 1, characterized in that, The gas distribution plate has no holes or few holes in the middle directly opposite the return air port, and the size of the surrounding holes increases from near to far.

4. The high-efficiency anti-oil spill tank according to claim 1, characterized in that, The return air port is located at the top center of the casing.

5. The high-efficiency anti-oil spill tank according to claim 1, characterized in that, The oil supply port is connected to the oil pump motor.

6. The high-efficiency anti-oil spill tank according to claim 1, characterized in that, A sight glass for observing the oil level is also installed on the main body of the oil tank. The sight glass is located below the filter screen and the oil level observation range covers a preset position.

7. The high-efficiency anti-oil spill tank according to claim 1, characterized in that, An oil level switch is also installed on the main body of the oil tank to trigger an alarm when the oil level drops to a preset position.

8. The high-efficiency anti-oil spill tank according to claim 1, characterized in that, The ejector return line includes an interconnected suction chamber and a mixing chamber; the narrow end of the nozzle-shaped working inlet extends into the suction chamber, and the wide end is connected to the top of the condenser; the suction chamber is provided with an ejector inlet, which is connected to the bottom of the evaporator; The mixing chamber is connected to the main body of the oil tank through the outlet end.

9. The high-efficiency anti-oil spill tank according to claim 1, characterized in that, The oil tank body also includes a baffle, which is used to fix the ejector return oil pipe so that the ejected liquid refrigerant splashes evenly.

10. A refrigeration system, characterized in that, The oil tank includes the high-efficiency oil spill prevention tank as described in any one of claims 1-9.

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