Automatic oil return system for refrigerating system

Abstract

The invention provides an automatic oil return system for a refrigerating system, which comprises a base, an oil collector, an oil return pipe, a lower oil pipe, a balance pipe, a hot air bypass pipe, a heating mechanism and a control mechanism, one end of the oil return pipe, one end of the lower oil pipe, one end of the balance pipe and one end of the hot air bypass pipe are communicated with an inner cavity of the oil collector, automatic adjusting valves are arranged on the oil return pipe, the lower oil pipe, the balance pipe and the hot air bypass pipe, the active heater is arranged on one side of the oil collector, one end of the heating pipe is communicated with the inner cavity of the oil collector, and the other end of the heating pipe is connected with the active heater. The control mechanism is arranged on the base and used for controlling operation or closing of the automatic adjusting valves on the oil return pipe, the lower oil pipe, the balance pipe and the hot air by-pass pipe. According to the device, lubricating oil can be automatically collected into the oil collector and automatically returned into a refrigerating system after oil distillation, the whole process is automatic, and therefore the burden of workers is relieved.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration systems, and in particular to an automatic oil return system for a refrigeration system. Background Art

[0002] During the operation of a closed-loop refrigeration system, lubricating oil will seep into the refrigerant system and eventually flow to the lowest pressure point in the system, usually accumulating in the evaporator of the refrigeration system. If the oil is not separated in time, it will affect the heat exchange efficiency of the system, increase energy consumption, and cause poor use of the system valves, affecting the stability of the system.

[0003] At present, most refrigeration systems use manual oil return or injection oil return to solve the oil return problem, but manual oil return has high requirements on operators and increases the workload of the staff. Moreover, the manual oil return method is only operated after a problem occurs in the refrigeration system, so there are hidden dangers when the system is running. Although the injection oil return method automatically recovers the lubricating oil, the oil return effect is poor, especially for low-temperature systems and high oil viscosity, which makes this oil return method unusable. And even if the recovery of the lubricating oil is completed, it is still necessary to purchase new oil and dispose of waste oil, which increases the cost of using the existing refrigeration system. Therefore, the existing technology has limitations. Summary of the invention

[0004] The present invention is made to solve the above-mentioned problems, and its object is to provide an automatic oil return system for a refrigeration system.

[0005] The present invention provides an automatic oil return system for a refrigeration system, which has the following characteristics: a base, an oil collector, an oil return pipe, a lower oil pipe, a balance pipe, a hot gas bypass pipe, a heating mechanism, and a control mechanism.

[0006] The oil collector is in the shape of a can and has an inner cavity for storing lubricating oil. The oil collector is arranged horizontally on the base.

[0007] One end of the oil return pipe, the lower oil pipe, the balance pipe, and the hot gas bypass pipe are all connected to the inner cavity of the oil collector, and the oil return pipe, the lower oil pipe, the balance pipe, and the hot gas bypass pipe are all provided with automatic regulating valves. The other end of the oil return pipe is used to connect to the air inlet end of the compressor in the refrigeration system, the other end of the lower oil pipe is used to connect to the upper end of the evaporator in the refrigeration system, the other end of the balance pipe is used to connect to the lower end of the evaporator in the refrigeration system, and the other end of the hot gas bypass pipe is connected to the exhaust end of the compressor in the refrigeration system.

[0008] The heating mechanism includes an active heater and a heating tube. The active heater is arranged on one side of the oil collector. One end of the heating tube is connected to the inner cavity of the oil collector, and the other end is connected to the active heater.

[0009] The control mechanism is arranged on the base, and is used to control the operation or closing of the automatic regulating valves on the oil return pipe, the lower oil pipe, the balance pipe, and the hot gas bypass pipe.

[0010] The automatic oil return system for a refrigeration system provided by the present invention can also have the following feature: a sight glass for observing the lubricating oil in the inner cavity is provided on the oil collector.

[0011] The automatic oil return system for a refrigeration system provided by the present invention can also have the following feature: the active heater is an explosion-proof electric heater.

[0012] The automatic oil return system for the refrigeration system provided by the present invention can also have the following characteristics: the temperature transmitter mechanism includes a connecting pipe and a temperature transmitter arranged on one end of the connecting pipe, and the other end of the connecting pipe is connected to the inner cavity of the oil collector.

[0013] The automatic oil return system for a refrigeration system provided by the present invention can also have the following feature: the oil collector is also provided with a safety valve for controlling the pressure of the inner cavity to not exceed a specified value.

[0014] The automatic oil return system for the refrigeration system provided by the present invention can also have the following characteristics: a drain pipe is provided on one side end of the oil collector, one end of the drain pipe is connected to the inner cavity, and a valve for controlling its opening or closing is provided on the drain pipe.

[0015] The automatic oil return system for a refrigeration system provided by the present invention can also have the following feature: a pressure gauge for measuring and displaying the internal pressure of the tube cavity is also provided on the hot gas bypass pipe.

[0016] The automatic oil return system for a refrigeration system provided by the present invention can also have the following feature: the control mechanism is an integrated control cabinet.

[0017] Functions and Effects of the Invention

[0018] The automatic oil return system for the refrigeration system involved in the present invention is designed to use an independent heating mechanism and the hot air at the outlet of the compressor in the refrigeration system to allow the lubricating oil to enter the oil collector from the oil return pipe, and then the lubricating oil flows back to the refrigeration system through the lower oil pipe after the oil distillation process in the oil collector, and this process can be automatically operated by the control mechanism. Therefore, the present invention can automatically collect the lubricating oil into the oil collector, and automatically return it to the refrigeration system after the oil distillation, and the whole process is automated, thereby reducing the burden on workers. In addition, because the present invention can distill the lubricating oil, the output of waste oil is reduced, thereby reducing the use cost of the existing refrigeration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an automatic oil return system for a refrigeration system of the present invention;

[0020] Figure 2 It is a front view of an automatic oil return system for a refrigeration system of the present invention;

[0021] Figure 3 The utility model is a top view of an automatic oil return system for a refrigeration system of the present invention.

[0022] Description of reference numerals:

[0023] 1. Oil collector; 2. Oil return pipe; 3. Downstream oil pipe; 4. Balance pipe; 5. Hot gas bypass pipe; 6. Temperature transmitter mechanism; 61. Connecting pipe; 62. Temperature transmitter; 7. Drain pipe; 71. Valve; 8. Heating mechanism; 81. Active heater; 82. Heating pipe; 9. Safety valve; 10. Base; 11. Sight glass; 12. Control mechanism; 13. Pressure gauge; 14. Automatic regulating valve. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is specifically described in the following embodiments in conjunction with the accompanying drawings.

[0025] Example

[0026] Figure 1 It is a structural schematic diagram of the present invention, Figure 2 is a front view of the present invention, Figure 3 It is a top view of the present invention.

[0027] like Figures 1 to 3 As shown, this embodiment provides an automatic oil return system for a refrigeration system, including: an oil collector 1, an oil return pipe 2, a lower oil pipe 3, a balance pipe 4, a hot gas bypass pipe 5, a temperature transmitter 6, a drain pipe 7, a valve 71, a heating mechanism 8, a safety valve 9, a base 10, a sight glass 11, a control mechanism 12, a pressure gauge 13, and an automatic regulating valve 14.

[0028] In this embodiment, the oil collector 1 is in the shape of a can, has an inner cavity for storing lubricating oil, and is disposed transversely on a base 10. A plurality of sight glasses 11 for observing the lubricating oil in the inner cavity are disposed on the outer wall of the oil collector 1.

[0029] In this embodiment, the number of the viewing mirrors 11 is preferably two, and they are respectively located at the front and rear sides of the oil collector 1 .

[0030] In this embodiment, one ends of the return oil pipe 2, the lower oil pipe 3, the balancing pipe 4, and the hot gas bypass pipe 5 are all connected to the inner cavity of the oil collector 1, and the return oil pipe 2, the lower oil pipe 3, the balancing pipe 4, and the hot gas bypass pipe 5 are all provided with an automatic regulating valve 14, the other end of the return oil pipe 2 is used to be connected to the air inlet end of the compressor in the refrigeration system, the other end of the lower oil pipe 3 is used to be connected to the upper end of the evaporator in the refrigeration system, the other end of the balancing pipe 4 is used to be connected to the lower end of the evaporator in the refrigeration system, and the other end of the hot gas bypass pipe 5 is connected to the exhaust end of the compressor in the refrigeration system.

[0031] In this embodiment, the temperature transmitter mechanism 6 includes a connecting tube 61 and a temperature transmitter 62 disposed on one end of the connecting tube 61 , and the other end of the connecting tube 61 is communicated with the inner cavity of the oil collector 1 .

[0032] In this embodiment, a drain pipe 7 is provided on one side end of the oil collector 1, one end of the drain pipe 7 is communicated with the inner cavity, and a valve 71 for controlling the opening or closing of the drain pipe 7 is provided on the drain pipe 7.

[0033] In this embodiment, the heating mechanism 8 includes an active heater 81 and a heating tube 82. The active heater 81 is arranged on one side of the oil collector 1. One end of the heating tube 82 is connected to the inner cavity of the oil collector 1, and the other end is connected to the active heater 81. The active heater 81 is preferably an explosion-proof electric heater.

[0034] In this embodiment, the oil collector 1 is further provided with a safety valve 9 for controlling the pressure of the inner cavity to not exceed a specified value.

[0035] In this embodiment, the control mechanism 12 is disposed on the base 10 and is used to control the operation or closing of the automatic regulating valve 14 on the oil return pipe 2 , the lower oil pipe 3 , the balance pipe 4 , and the hot gas bypass pipe 5 .

[0036] In this embodiment, the hot gas bypass pipe 5 is further provided with a pressure gauge 13 for measuring and displaying the internal pressure of the lumen thereof.

[0037] When the present invention is used, the control mechanism 12 first controls the automatic regulating valve 14 on the oil return pipe 2 and the hot gas bypass pipe 5 to open, and controls the automatic regulating valve 14 on the lower oil pipe 3 and the balance pipe 4 to close, thereby recovering the lubricating oil in the compressor of the refrigeration system and completing the oil return process. Then the control mechanism 12 controls the automatic regulating valve 14 on the balance pipe 4 to open, and turns on the active heater 81, and then controls the automatic regulating valve 14 on the oil return pipe 2, the lower oil pipe 3, and the hot gas bypass pipe 5 to close, thereby performing the oil distillation process on the lubricating oil in the oil collector 1. Finally, the control mechanism 12 controls the automatic regulating valve 14 on the lower oil pipe 3 to open and turns on the active heater 81, and then controls the automatic regulating valve 14 on the oil return pipe 2, the balance pipe 4, and the hot gas bypass pipe 5 to close, thereby completing the oil discharge process.

[0038] Therefore, the compressed lubricating oil can be automatically recovered from the low-pressure side, and after a period of time, the recovered lubricating oil is forced back to the compressor assembly for storage and reuse. This not only reduces operating costs, but also ensures the stable operation of the compressor. This allows the present invention to be used in industries such as oil, natural gas, chemicals, and food and beverages, and can be used with most types of refrigerants (including propane, ammonia and fluorocarbons). In addition, the multiple advantages provided by the present invention can improve the performance and life of key compression and processing systems, and is an indispensable part of the refrigeration system.

[0039] Functions and Effects of the Embodiments

[0040] The automatic oil return system for the refrigeration system involved in the present invention is designed to use an independent heating mechanism and the hot air at the outlet of the compressor in the refrigeration system to allow the lubricating oil to enter the oil collector from the oil return pipe, and then the lubricating oil flows back to the refrigeration system through the lower oil pipe after the oil distillation process in the oil collector, and this process can be automatically operated by the control mechanism. Therefore, the present invention can automatically collect the lubricating oil into the oil collector, and automatically return it to the refrigeration system after the oil distillation, and the whole process is automated, thereby reducing the burden on workers. In addition, because the present invention can distill the lubricating oil, the output of waste oil is reduced, thereby reducing the use cost of the existing refrigeration system.

[0041] The above-mentioned embodiments are preferred examples of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. An automatic oil return system for a refrigeration system, characterized in that: include: Base, oil collector, oil return pipe, oil down pipe, balance pipe, hot gas bypass pipe, heating mechanism, and control mechanism, The oil collector is in the shape of a can and has an inner cavity for storing lubricating oil. The oil collector is transversely arranged on the base. One ends of the oil return pipe, the lower oil pipe, the balance pipe and the hot gas bypass pipe are all connected to the inner cavity of the oil collector, and the oil return pipe, the lower oil pipe, the balance pipe and the hot gas bypass pipe are all provided with automatic regulating valves, the other end of the oil return pipe is used to be connected to the air inlet end of the compressor in the refrigeration system, the other end of the lower oil pipe is used to be connected to the upper end of the evaporator in the refrigeration system, the other end of the balance pipe is used to be connected to the lower end of the evaporator in the refrigeration system, and the other end of the hot gas bypass pipe is connected to the exhaust end of the compressor in the refrigeration system. The heating mechanism comprises an active heater and a heating tube. The active heater is arranged on one side of the oil collector. One end of the heating tube is communicated with the inner cavity of the oil collector, and the other end is connected to the active heater. The control mechanism is arranged on the base, and is used to control the operation or closing of the automatic regulating valve on the oil return pipe, the lower oil pipe, the balance pipe, and the hot gas bypass pipe.

2. The automatic oil return system for a refrigeration system according to claim 1, characterized in that: in, The oil collector is provided with a sight glass for observing the lubricating oil in the inner cavity.

3. The automatic oil return system for a refrigeration system according to claim 1, characterized in that: in, The active heater is an explosion-proof electric heater.

4. The automatic oil return system for a refrigeration system according to claim 1, characterized in that: Also includes: The temperature transmitter mechanism comprises a connecting pipe and a temperature transmitter arranged on one end of the connecting pipe, and the other end of the connecting pipe is communicated with the inner cavity of the oil collector.

5. The automatic oil return system for a refrigeration system according to claim 1, characterized in that: in, The oil collector is also provided with a safety valve for controlling the pressure of the inner cavity to not exceed a specified value.

6. The automatic oil return system for a refrigeration system according to claim 1, characterized in that: in, A drain pipe is provided on one side end of the oil collector, one end of the drain pipe is communicated with the inner cavity, and a valve for controlling the opening or closing of the drain pipe is provided on the drain pipe.

7. The automatic oil return system for a refrigeration system according to claim 1, characterized in that: in, The hot gas bypass pipe is also provided with a pressure gauge for measuring and displaying the internal pressure of the pipe cavity.

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