Oil return system of refrigerating unit
By setting up a double lift pipe and an oil collection pack in the oil return system of the refrigeration unit, and connecting the suction header of the compressor through the bypass pipe, the problems of long oil return cycle and reduced heat exchange efficiency caused by the traditional oil return method are solved, and the effect of fast and stable oil return and improving the heat exchange efficiency of the evaporator is achieved.
Patent Information
- Application Number
- CN202421804130.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-29
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-29
AI Technical Summary
The traditional oil return method of the existing refrigeration unit causes the lubricating oil to enter the condenser with the gaseous refrigerant, reducing the heat exchange efficiency of the evaporator, causing the oil return cycle to become longer and the amount of refrigerated oil required increases.
A refrigeration unit oil return system is designed. By setting up a double lift pipe in the pipeline from the exhaust port of the oil separator to the condenser, and an oil collection bag is set at the bottom of the pipeline. The oil collection bag is connected to the suction header of the compressor through the bypass pipe, so that the lubricating oil enters the compressor through the suction pipe of the compressor, shortening the oil return cycle and achieving continuous, stable and rapid oil return.
The oil return cycle is shortened, the lubricant charge amount is reduced, the proportion of lubricant in the evaporator refrigerant is reduced, and the heat exchange efficiency of the evaporator is improved.
Smart Images
Figure CN222824601U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an oil return system of a refrigeration unit and belongs to the technical field of refrigeration systems. Background Art
[0002] The refrigeration compressor unit is mainly composed of refrigeration compressor, condenser, air cooler, solenoid valve, oil separator, liquid storage tank, oil sight glass, diaphragm hand valve, return air filter and other components.
[0003] In the operation of the refrigeration unit, in order to ensure the lubrication of the compressor, the compressor oil return plays a key role. The lack of oil in the compressor will cause the compressor to wear and eventually damage. At present, most refrigeration units use the traditional oil return method, so that part of the lubricating oil enters the condenser with the gaseous refrigerant and then enters the system circulation, which reduces the heat exchange efficiency of the evaporator, causes the oil return cycle to become longer, and increases the required refrigeration oil. Utility Model Content
[0004] 1. Technical issues to be resolved
[0005] The purpose of the utility model is to provide an oil return system for a refrigeration unit in order to solve the above problems.
[0006] (II) Technical solution
[0007] The utility model is implemented through the following technical scheme: an oil return system of a refrigeration unit, including a compressor, an oil separator for separating gaseous refrigerant from lubricating oil is arranged on one side of the compressor, a condenser is arranged on one side of the oil separator, a double riser is fixedly connected between the exhaust port of the oil separator and the condenser, an oil collecting bag is arranged at the bottom of the double riser, a bypass pipe is fixedly connected between the compressor suction manifold and the bottom of the oil collecting bag, so that the lubricating oil enters the compressor through the compressor suction pipe, which can shorten the oil return cycle, achieve continuous, stable and rapid oil return, and reduce the filling amount of the lubricating oil.
[0008] Preferably, the oil collecting bag is used to collect the lubricating oil not separated by the oil separator, and the oil collecting bag is arranged at the bottom of the double riser from the exhaust port of the oil separator.
[0009] Preferably, the bypass pipe is provided with a throttling device, two stop valves, a filter and a solenoid valve, the two stop valves are arranged at both ends of the bypass pipe, and the solenoid valve is arranged between the throttling device and the filter. The effect of filtering and flow control of the lubricating oil is achieved by the valve arranged on the bypass pipe.
[0010] Preferably, the output end of the condenser is connected to a liquid reservoir to collect the condensate, the output end of the liquid reservoir is connected to an evaporator, the liquid reservoir and the evaporator are connected via a throttling device, and the output end of the evaporator is connected to the input end of the compressor.
[0011] Preferably, an inner cylinder is fixedly connected to the upper part of the oil separator, a conical platform is arranged inside the inner cylinder, the conical platform corresponds to the air inlet of the oil separator, a plurality of spiral plates are fixedly connected to the top of the conical platform in a ring array, the plurality of spiral plates are all arranged as arc surfaces, a plurality of spoilers are fixedly connected to the top of the oil separator, the plurality of spoilers are respectively adapted to the shapes of the plurality of spiral plates, so that the high-pressure gas coming out of the compressor enters from the air inlet of the oil separator and flows along the top of the conical platform, and at the same time, the plurality of spiral plates guide the airflow so that the airflow flows in a spiral shape along the spiral plates, and the lubricating oil is separated from the gas by centrifugal force and gravity, and falls on the inner wall of the inner cylinder, slides down and is collected.
[0012] Preferably, a scraper is fixedly connected to the outer side of each of the spiral plates, and each of the scrapers fits the inner wall of the inner cylinder, so that the scraper scrapes the lubricating oil on the inner wall of the inner cylinder to make the lubricating oil stuck to the wall fall down.
[0013] Preferably, a filter is fixedly connected to the bottom of the inner cylinder, a rotating shaft is rotatably connected inside the filter, the top of the rotating shaft is fixedly connected to the conical table, a guide plate is fixedly connected to the bottom end of the inner wall of the inner cylinder, and the guide plate fits with the top of the filter to facilitate the fine filtering of the lubricating oil in the gas.
[0014] The utility model provides an oil return system for a refrigeration unit, which has the following beneficial effects:
[0015] 1. The oil return system of the refrigeration unit has double risers in the pipeline from the oil separator exhaust port to the condenser and an oil collection bag is set at the bottom of the pipeline. The oil collection bag is connected to the suction manifold of the compressor through a bypass pipeline, so that the lubricating oil enters the compressor through the compressor suction pipe, which can shorten the oil return cycle and achieve continuous, stable and rapid oil return; reduce the lubricating oil filling amount and reduce the proportion of lubricating oil in the evaporator refrigerant. Reasonable reduction of the lubricating oil filling amount also increases the heat exchange efficiency of the evaporator.
[0016] 2. In the oil return system of the refrigeration unit, when the gas discharged from the compressor enters the oil separator, the gas flows in a spiral along the conical table and the spiral plate, and at the same time moves relative to multiple spoilers during gas circulation to form turbulence, thereby improving the oil and gas separation effect, so that the oil is quickly centrifuged to the inner wall of the inner cylinder, and when the gas drives the spiral plate and the conical table to rotate, the conical table drives the scraper to rotate on the inner wall of the inner cylinder, scraping off the oil adhering to the inner wall of the inner cylinder, accelerating the falling speed of the oil, and the falling oil slides along the guide plate to the inside of the filter, and the impurities in the oil and gas are filtered through the filter to prevent impurity pollution. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0018] Figure 2 This is a schematic diagram of the structure of the oil separator of the utility model;
[0019] Figure 3 This is a schematic diagram of the internal structure of the oil separator of the utility model;
[0020] Figure 4 It is a structural schematic diagram of the spiral plate of the utility model;
[0021] Figure 5 It is a structural schematic diagram of the filter screen of the utility model.
[0022]
Main component symbol description
[0023] 1. Compressor; 2. Oil separator; 3. Condenser; 4. Liquid storage tank; 5. Throttling device; 6. Evaporator; 7. Stop valve; 8. Filter; 9. Solenoid valve; 10. Double riser; 11. Rotating shaft; 12. Conical table; 13. Spiral plate; 14. Scraper; 15. Spoiler; 16. Filter; 17. Guide plate; 18. Inner cylinder. DETAILED DESCRIPTION
[0024] The embodiment of the utility model provides an oil return system for a refrigeration unit.
[0025] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5, including a compressor 1, an oil separator 2 for separating gaseous refrigerant from lubricating oil is arranged on one side of the compressor 1, a condenser 3 is arranged on one side of the oil separator 2, a double riser 10 is fixedly connected between the exhaust port of the oil separator 2 and the condenser 3, an oil collecting bag is arranged at the bottom of the double riser 10, a bypass pipe is fixedly connected between the suction manifold of the compressor 1 and the bottom of the oil collecting bag, so that the lubricating oil enters the compressor 1 through the suction pipe of the compressor 1, which can shorten the oil return cycle, achieve continuous, stable and rapid oil return, and reduce the filling amount of the lubricating oil, the oil collecting bag is used to collect the lubricating oil that is not separated by the oil separator 2, and the oil collecting bag is arranged It is placed from the exhaust port of the oil separator 2 to the bottom of the double rise pipe 10. A throttling device 5, two stop valves 7, a filter 8 and a solenoid valve 9 are arranged on the bypass pipe. The two stop valves 7 are arranged at both ends of the bypass pipe. The solenoid valve 9 is arranged between the throttling device 5 and the filter 8. The effect of filtering and flow control of the lubricating oil is achieved by setting the valve on the bypass pipeline. The output end of the condenser 3 is connected to the liquid reservoir 4 to collect the condensate. The output end of the liquid reservoir 4 is connected to the evaporator 6. The liquid reservoir 4 and the evaporator 6 are connected through the throttling device 5. The output end of the evaporator 6 is connected to the input end of the compressor 1.
[0026] An inner cylinder 18 is fixedly connected to the upper part of the oil separator 2, and a conical platform 12 is arranged inside the inner cylinder 18. The conical platform 12 corresponds to the air inlet of the oil separator 2. A plurality of spiral plates 13 are fixedly connected to the top of the conical platform 12 in an annular array. The plurality of spiral plates 13 are all arranged as cambered surfaces. A plurality of spoilers 15 are fixedly connected to the top of the oil separator 2. The plurality of spoilers 15 are respectively adapted to the shapes of the plurality of spiral plates 13, so that the high-pressure gas from the compressor 1 enters from the air inlet of the oil separator 2 and flows along the top of the conical platform 12. At the same time, the plurality of spiral plates 13 guide the airflow so that the airflow flows in a spiral shape along the spiral plates 13. The lubricating oil is separated from the gas by centrifugal force and gravity, and falls on the inner wall of the inner cylinder 18 and slides down for collection. The outer sides of the plurality of spiral plates 13 are fixedly connected with scrapers 14, and the plurality of scrapers 14 are in contact with the inner wall of the inner cylinder 18, so that the scrapers 14 scrape the lubricating oil on the inner wall of the inner cylinder 18 to make the lubricating oil on the wall fall. The bottom of the inner cylinder 18 is fixedly connected with a filter screen 16, and the filter screen 16 is rotatably connected with a rotating shaft 11 inside, and the top of the rotating shaft 11 is fixedly connected with the conical platform 12, and the bottom end of the inner wall of the inner cylinder 18 is fixedly connected with a guide plate 17, and the guide plate 17 is in contact with the top of the filter screen 16, so as to facilitate the fine filtering of the lubricating oil in the gas.
[0027] When the utility model is in use: the refrigerant and lubricating oil compressed by the compressor 1 are connected to the oil separator 2 through the exhaust manifold. Since any form of oil separator 2 cannot achieve 100% oil separation efficiency, part of the lubricating oil will enter the condenser 3 with the gaseous refrigerant and then enter the system circulation after condensation, which will cause the oil return cycle to become longer and the required refrigeration oil to increase. Therefore, the utility model makes a double riser 10 in the pipeline from the exhaust port of the oil separator 2 to the condenser 3 and sets an oil collecting bag at the bottom of the pipeline. The oil collecting bag is connected to the suction manifold of the compressor 1 through a bypass pipeline, so that the lubricating oil enters the compressor 1 through the suction pipe of the compressor 1, which can shorten the oil return cycle and achieve continuous, stable and rapid oil return; reduce the filling amount of lubricating oil and reduce the proportion of lubricating oil in the refrigerant of the evaporator 6. While reasonably reducing the filling amount of lubricating oil, the heat exchange efficiency of the evaporator 6 is also increased.
[0028] When the gas discharged from the compressor 1 enters the oil separator 2, the gas flows in a spiral along the conical table 12 and the spiral plate 13, and at the same time, moves relative to the multiple spoilers 15 during the gas circulation to form turbulence, thereby improving the separation effect of oil and gas, so that the oil is quickly centrifuged to the inner wall of the inner cylinder 18, and when the gas drives the spiral plate 13 and the conical table 12 to rotate, the conical table 12 drives the scraper 14 to rotate on the inner wall of the inner cylinder 18, scraping off the oil adhered to the inner wall of the inner cylinder 18, accelerating the falling speed of the oil, and the falling oil slides along the guide plate 17 to the inside of the filter screen 16, and the impurities in the oil and gas are filtered through the filter screen 16 to prevent impurity pollution.
[0029] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. An oil return system for a refrigeration unit, comprising a compressor (1), characterized in that: An oil separator (2) for separating gaseous refrigerant from lubricating oil is provided on one side of the compressor (1), a condenser (3) is provided on one side of the oil separator (2), a double riser (10) is fixedly connected between the exhaust port of the oil separator (2) and the condenser (3), an oil collecting bag is provided at the bottom of the double riser (10), and a bypass pipe is fixedly connected between the suction manifold of the compressor (1) and the bottom of the oil collecting bag.
2. The oil return system of a refrigeration unit according to claim 1, characterized in that: The oil collecting bag is used to collect lubricating oil not separated by the oil separator (2), and the oil collecting bag is arranged at the bottom of the double riser (10) from the exhaust port of the oil separator (2).
3. The oil return system of a refrigeration unit according to claim 1, characterized in that: The bypass pipe is provided with a throttling device (5), two stop valves (7), a filter (8) and a solenoid valve (9); the two stop valves (7) are arranged at both ends of the bypass pipe, and the solenoid valve (9) is arranged between the throttling device (5) and the filter (8).
4. The oil return system of a refrigeration unit according to claim 1, characterized in that: The output end of the condenser (3) is connected to a liquid reservoir (4), the output end of the liquid reservoir (4) is connected to an evaporator (6), the liquid reservoir (4) and the evaporator (6) are connected via a throttling device (5), and the output end of the evaporator (6) is connected to the input end of the compressor (1).
5. The oil return system of a refrigeration unit according to claim 1, characterized in that: An inner cylinder (18) is fixedly connected to the upper part of the oil separator (2), a conical platform (12) is arranged inside the inner cylinder (18), the conical platform (12) corresponds to the air inlet of the oil separator (2), a plurality of spiral plates (13) are fixedly connected to the top of the conical platform (12) in an annular array, the plurality of spiral plates (13) are all arranged as arc surfaces, and a plurality of spoilers (15) are fixedly connected to the top of the oil separator (2), the plurality of spoilers (15) are respectively adapted to the shapes of the plurality of spiral plates (13).
6. The oil return system of a refrigeration unit according to claim 5, characterized in that: The outer sides of the plurality of spiral plates (13) are all fixedly connected with scrapers (14), and the plurality of scrapers (14) are all in contact with the inner wall of the inner cylinder (18).
7. The oil return system of a refrigeration unit according to claim 6, characterized in that: A filter screen (16) is fixedly connected to the bottom of the inner cylinder (18), a rotating shaft (11) is rotatably connected inside the filter screen (16), the top end of the rotating shaft (11) is fixedly connected to the conical platform (12), a guide plate (17) is fixedly connected to the bottom end of the inner wall of the inner cylinder (18), and the guide plate (17) is in contact with the top of the filter screen (16).