Lubricating oil system of semi-closed screw compressor
By designing a lubricating oil system in a semi-hermetic screw compressor, the circulation of lubricating oil is achieved through a connecting oil circuit and a circulating pressurization mechanism. Combined with cooling and filtration, this solves the problem of uneven wear caused by the temperature difference between the male and female rotors, and improves meshing and lubrication.
Patent Information
- Application Number
- CN202522362007.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-07
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2035-11-07
AI Technical Summary
When using hydrofluorocarbon refrigerants such as R-134a and R-404A, existing semi-hermetic screw compressors have a temperature difference between the two ends of the male and female rotors, which leads to uneven wear and affects the meshing degree.
A semi-hermetic screw compressor lubrication system is designed. A first lubrication chamber and a second lubrication chamber are set on both sides of the housing. The lubricating oil is circulated between the two chambers by using a connecting oil circuit and a circulating pressurization mechanism. The lubricating oil is treated by a cooler and a filter to reduce the temperature difference and balance wear.
It effectively reduces the temperature difference between the two ends of the male and female rotors, improves wear uniformity, ensures the meshing degree of the male and female rotors, and reduces the investment in subsequent oil-gas separation equipment.
Smart Images
Figure CN223676521U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of bearing lubrication, in particular to a semi-closed screw compressor lubricating oil system. BACKGROUND
[0002] The semi-closed screw compressor is one of the structural types of the screw compressor, and the compression treatment of refrigerant is realized through male and female rotors; the existing semi-closed screw compressor adopts an oil type lubricating system and an oil-gas separation system to realize the synchronous lubrication of the bearings at the two ends of the male and female rotors and the male and female rotors and the mutual separation of refrigerant and lubricating oil; with the application of hydrogen fluoride compound mixed refrigerant such as R-134a and R-404A, due to the special polar group in the molecular structure of the hydrogen fluoride compound, a lubricating film can be formed by adsorption on the metal surface in the circulation process, and only the lubrication of the bearings at the two ends of the male and female rotors can be considered in the design process, but due to the fact that one end of the male and female rotors is close to the air inlet end of the compressor and the other end is close to the air outlet end of the compressor, there is a temperature difference at the end of the male and female rotors, which causes the wear degree of the two ends of the male and female rotors to deviate, and further affects the engagement degree of the male and female rotors, and has certain use limitations. SUMMARY
[0003] In view of the deficiencies of the prior art, the utility model provides a semi-closed screw compressor lubricating oil system which can effectively reduce the temperature difference at the two ends of the male and female rotors, improve the wear balance of the two ends of the male and female rotors, and ensure the engagement degree of the male and female rotors.
[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a semi-closed screw compressor lubricating oil system, comprising a shell, an anode rotor and a cathode rotor, a compression cavity is arranged in the middle of the shell, first and second lubricating cavities which are isolated from the compression cavity are arranged on both sides of the shell, the anode rotor and the cathode rotor are both rotatably installed in the compression cavity, and the two ends of the anode rotor and the cathode rotor respectively extend into the first and second lubricating cavities; further comprising a communication oil way and a circulating pressurizing mechanism, one end of the communication oil way communicates with the first lubricating cavity, the other end of the communication oil way communicates with the second lubricating cavity, the cathode rotor is internally provided with a hollow oil way which communicates the first and second lubricating cavities, the circulating pressurizing mechanism is installed in the second lubricating cavity, the input end of the circulating pressurizing mechanism communicates with the output end of the hollow oil way, and the circulating pressurizing mechanism pressurizes the lubricating oil in the hollow oil way and then injects it into the second lubricating cavity; further, bearings for supporting the anode rotor and the cathode rotor and gear assemblies for transmission of the anode rotor and the cathode rotor are installed in the first and second lubricating cavities, and liquid lubricating oil is filled in the first and second lubricating cavities.
[0005] Preferably, the circulating pressurizing mechanism comprises a sealing shell fixedly installed in the second lubricating cavity, a driving shaft rotatably installed in the sealing shell, an eccentric shaft fixedly installed at an eccentric position of the driving shaft, a transmission handle rotatably installed on the eccentric shaft, and a piston, the driving shaft is fixedly connected with the end of the anode rotor, the sealing shell is provided with a sliding chamber matched with the outer wall of the piston, the piston is slidably installed in the sliding chamber, the transmission handle is rotatably connected with the piston, the sealing shell is provided with a three-way pipe communicated with the sliding chamber, the top outflow end of the three-way pipe is provided with a first one-way valve allowing the lubricating oil in the sliding chamber to flow out of the second lubricating cavity, and one inflow end of the three-way pipe is provided with a second one-way valve allowing the lubricating oil in the hollow oil passage to enter the sliding chamber.
[0006] Preferably, the communication oil passage is arranged outside the shell.
[0007] Preferably, a filter for filtering the lubricating oil is arranged on the communication oil passage, and further, the filter comprises a mounting shell communicated with the communication oil passage and a filter core detachably installed in the mounting shell.
[0008] Preferably, a cooler for cooling the lubricating oil is arranged on the communication oil passage, and the cooler can be a conventional tubular heat exchanger or other equivalent cooling member having a pipe cooling effect.
[0009] Preferably, the cooler comprises a shell cover, a flow guide core installed in the shell cover, and an inflow cover installed at the inflow end of the flow guide core, a cooling cavity is formed between the outer wall of the inflow cover and the flow guide core, the shell cover is provided with an inflow pipe and an outflow pipe communicated with the cooling cavity, the flow guide core comprises a plurality of spiral flow guide pipes, the cross section of the spiral flow guide pipes is in the shape of a hollow cross, the outflow end of the communication oil passage is communicated with the inside of the shell cover, a collection cavity is formed between the outflow end of the spiral flow guide pipe and the shell cover, and the inflow end of the communication oil passage is communicated with the collection cavity. Further, when the outer diameter of the spiral flow guide pipe is constant, the cross section of the spiral flow guide pipe is in the shape of a hollow cross, the heat exchange area of the spiral flow guide pipe is increased, and the volume of the cooling cavity is increased, so that the cooling effect of the lubricating oil flowing through the spiral flow guide pipe is improved.
[0010] Preferably, the oil supplementing mechanism comprises a mounting seat installed on the shell, a cylindrical shell installed on the mounting seat, a plug column slidably installed in the cylindrical shell, an oil supplementing pipeline, and an oil inlet pipeline, the outflow end of the oil supplementing pipeline is communicated with the inside of the cylindrical shell, the oil supplementing pipeline is provided with a third one-way valve allowing the lubricating oil in the oil supplementing pipeline to enter the cylindrical shell, the inflow end of the oil inlet pipeline is communicated with the inside of the cylindrical shell, the outflow end of the oil inlet pipeline is communicated with the communication oil passage, and the oil inlet pipeline is provided with a fourth one-way valve allowing the lubricating oil to enter the communication oil passage through the oil inlet pipeline.
[0011] Preferably, the oil supplementing mechanism further comprises a driving member for driving the plug column, the driving member comprising a brace rod hingedly mounted on a mounting seat and a connecting rod hingedly connected at one end to the brace rod and at the other end to an end portion of the plug column, and a handle fixedly mounted on the connecting rod.
[0012] Advantages
[0013] Compared with the prior art, the semi-hermetic screw compressor lubricating oil system has the following advantages: the semi-hermetic screw compressor lubricating oil system injects lubricating oil into the first lubricating cavity and the second lubricating cavity, and through the circulating pressurizing mechanism, the lubricating oil in the first lubricating cavity is drawn into the second lubricating cavity through the hollow oil passage, and then the lubricating oil flows back to the first lubricating cavity through the communication oil passage, so that the lubricating oil in the first lubricating cavity and the second lubricating cavity is mixed with each other, the temperature in the first lubricating cavity and the second lubricating cavity is balanced, and the cathode rotor can be cooled and uniformly heated during the flow of the lubricating oil through the hollow oil passage, thereby achieving the auxiliary cooling effect in the compression cavity, effectively reducing the temperature difference between the two ends of the cathode rotor and the anode rotor, improving the wear balance of the two ends of the cathode rotor and the anode rotor, and ensuring the engagement degree of the cathode rotor and the anode rotor. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 is a schematic diagram of the three-dimensional structure of the embodiment 1 of the utility model.
[0015] Figure 2 is a schematic diagram of the front plane structure of the embodiment 1.
[0016] Figure 3 is Figure 2 a schematic diagram of the cross-sectional structure at A-A.
[0017] Figure 4 is Figure 2 a schematic diagram of the cross-sectional structure at B-B.
[0018] Figure 5 is Figure 3 a schematic diagram of the cross-sectional structure at C-C.
[0019] Figure 6 is Figure 3 a schematic diagram of the cross-sectional structure at D-D.
[0020] Figure 7 is Figure 4 a schematic diagram of the enlarged structure at E.
[0021] Figure 8 is a schematic diagram of the three-dimensional structure of the flow guide core in the embodiment 1.
[0022] Figure 9 is a schematic diagram of the structure of the embodiment 2 of the utility model.
[0023] 1, housing; 2, anode rotor; 3, cathode rotor; 4, compression chamber; 5, first lubricating chamber; 6, second lubricating chamber; 7, communication oil passage; 8, hollow oil passage; 9, sealing shell; 10, driving shaft; 11, eccentric shaft; 12, transmission handle; 13, piston; 14, sliding chamber; 15, three-way pipe; 16, first one-way valve; 17, second one-way valve; 18, filter; 19, outer shell cover; 20, inlet cover; 21, inlet pipe; 22, outlet pipe; 23, spiral guide pipe; 24, mounting seat; 25, cylindrical shell; 26, plug column; 27, oil supplement pipeline; 28, oil inlet pipeline; 29, third one-way valve; 30, fourth one-way valve; 31, brace rod; 32, connecting rod; 33, handle; 34, oil pump. DETAILED DESCRIPTION
[0024] In order to make the personnel in the technical field better understand the utility model scheme, the technical scheme in the utility model embodiments will be described clearly and completely below in combination with the drawings in the utility model embodiments. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the utility model.
[0025] It should be noted that the embodiments and the features and technical solutions in the embodiments in the utility model can be combined with each other without conflict.
[0026] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.
[0027] Embodiment 1
[0028] Please refer to Figures 1-3A semi-closed screw compressor lubricating oil system, comprising a shell 1, an anode rotor 2 and a cathode rotor 3, a compression cavity 4 is arranged in the middle of the shell 1, a first lubricating cavity 5 and a second lubricating cavity 6 are arranged on both sides of the shell 1 and are isolated from the compression cavity 4, the anode rotor 2 and the cathode rotor 3 are both rotatably installed in the compression cavity 4, and both ends of the anode rotor 2 and the cathode rotor 3 extend into the first lubricating cavity 5 and the second lubricating cavity 6 respectively; further comprising a communication oil way 7 and a circulating pressurizing mechanism, one end of the communication oil way 7 communicates with the first lubricating cavity 5, the other end of the communication oil way 7 communicates with the second lubricating cavity 6, the cathode rotor 3 is internally provided with a hollow oil way 8 which communicates the first lubricating cavity 5 and the second lubricating cavity 6, the circulating pressurizing mechanism is installed in the second lubricating cavity 6, the input end of the circulating pressurizing mechanism communicates with the output end of the hollow oil way 8, and the circulating pressurizing mechanism pressurizes the lubricating oil in the hollow oil way 8 and then injects it into the second lubricating cavity 6; further, bearings for supporting the anode rotor 2 and the cathode rotor 3 and gear assemblies for driving the anode rotor 2 and the cathode rotor 3 are both installed in the first lubricating cavity 5 and the second lubricating cavity 6, and the first lubricating cavity 5 and the second lubricating cavity 6 are both filled with liquid lubricating oil.
[0029] Please refer to Figure 1 and Figure 4 , the communication oil way 7 is externally arranged outside the shell 1. A filter 18 for filtering lubricating oil is installed on the communication oil way 7; further, the filter 18 comprises a mounting shell which communicates with the communication oil way 7 and a filter core which is detachably installed in the mounting shell. A cooler for cooling lubricating oil is also installed on the communication oil way 7; the cooler can adopt a conventional tubular heat exchanger or other equivalent cooling components with pipe cooling effect.
[0030] Specifically, please refer to Figure 3 , Figures 5-6 , the circulating pressurizing mechanism comprises a sealing shell 9 which is fixedly installed in the second lubricating cavity 6, a driving shaft 10 which is rotatably installed in the sealing shell 9, an eccentric shaft 11 which is fixedly installed at the eccentric position of the driving shaft 10, a transmission handle 12 and a piston 13 which are rotatably installed on the eccentric shaft 11, the driving shaft 10 is fixedly connected with the end of the anode rotor 2, the sealing shell 9 is internally provided with a sliding chamber 14 which is matched with the outer wall of the piston 13, the piston 13 is slidably installed in the sliding chamber 14, the transmission handle 12 is rotatably connected with the piston 13, the sealing shell 9 is installed with a three-way pipe 15 which communicates with the sliding chamber 14, the top outflow end of the three-way pipe 15 is installed with a first one-way valve 16 which allows the lubricating oil in the sliding chamber 14 to flow out into the second lubricating cavity 6, and one inflow end of the three-way pipe 15 is installed with a second one-way valve 17 which allows the lubricating oil in the hollow oil way 8 to enter the sliding chamber 14.
[0031] Please refer to Figures 5-6The semi-hermetic screw compressor lubricating oil system further comprises an oil supplementing mechanism, which comprises a mounting seat 24 mounted on the shell 1, a cylindrical shell 25 mounted on the mounting seat 24, a plug column 26 slidingly mounted in the cylindrical shell 25, an oil supplementing pipeline 27 and an oil inlet pipeline 28. The oil supplementing pipeline 27 is in communication with the inside of the cylindrical shell 25, and a third one-way valve 29 is mounted on the oil supplementing pipeline 27 to allow lubricating oil in the oil supplementing pipeline 27 to flow into the cylindrical shell 25 in one direction. The oil inlet pipeline 28 is in communication with the inside of the cylindrical shell 25, and the outlet of the oil inlet pipeline 28 is in communication with the communication oil passage 7. A fourth one-way valve 30 is arranged on the oil inlet pipeline 28 to allow lubricating oil to flow into the communication oil passage 7 in one direction through the oil inlet pipeline 28.
[0032] Specifically, please refer to Figure 6 The oil supplementing mechanism further comprises a driving member for driving the plug column 26, which comprises a support rod 31 hingedly mounted on the mounting seat 24 and a connecting rod 32 hingedly connected at one end to the support rod 31 and at the other end to the end of the plug column 26. A handle 33 is fixedly mounted on the connecting rod 32. Further, the driving member can also be an electric telescopic cylinder or other equivalent member capable of driving the plug column 26.
[0033] The anode rotor 2 drives the driving shaft 10 and the eccentric shaft 11 to rotate during rotation, and the piston 13 moves reciprocally in the sliding chamber 14 after being driven by the transmission handle 12, so as to Figure 5 For reference, when the piston 13 moves to the left, the pressure in the sliding chamber 14 decreases, the first one-way valve 16 is closed, the second one-way valve 17 is opened, and the lubricating oil in the hollow oil passage 8 is sucked into the sliding chamber 14. When the piston 13 moves to the right, the pressure in the sliding chamber 14 increases, the first one-way valve 16 is opened, and the second one-way valve 17 is closed, so that the lubricating oil is pressed into the second lubricating cavity 6. As the amount of lubricating oil in the second lubricating cavity 6 increases, the pressure in the second lubricating cavity 6 increases, and the lubricating oil flows back to the first lubricating cavity 5 through the communication oil passage 7, thereby realizing the pressurization circulation of the lubricating oil. The power of the anode rotor 2 can be used to drive the circulation pressurization mechanism to operate, without the need for an external control system and external power, so that the compressor and the circulation pressurization mechanism can be started and stopped synchronously. It should be noted that the lubricating oil in the first lubricating cavity 5 and the second lubricating cavity 6 should be full flow, and the height of the lubricating oil in the first lubricating cavity 5 and the second lubricating cavity 6 should be at least 2 / 3 of the height of the first lubricating cavity 5 and the second lubricating cavity 6, so as to ensure that there is enough lubricating oil in the first lubricating cavity 5. An oil level monitor such as an oil level gauge can be arranged at the first lubricating cavity 5 and the second lubricating cavity 6 to obtain the liquid level of the lubricating oil in the first lubricating cavity 5 and the second lubricating cavity 6 in time. When the lubricating oil needs to be supplemented, the oil supplementing pipeline 27 can be inserted into an external lubricating oil tank to Figure 6For reference, when the plug column 26 moves to the right, the pressure in the cylindrical shell 25 decreases, the third one-way valve 29 opens, the fourth one-way valve 30 closes, and the lubricating oil enters the cylindrical shell 25 through the oil supplement pipeline 27. When the plug column 26 moves to the left, the pressure in the cylindrical shell 25 increases, the third one-way valve 29 closes, and the fourth one-way valve 30 opens. The lubricating oil enters the communication oil way 7 through the oil inlet pipeline 28, thereby achieving lubricating oil supplement and improving the convenience of lubricating oil supplement. By pressing and pulling the handle 33, the plug column 26 can be driven through the support rod 31 and the connecting rod 32, which is more convenient and labor-saving, and the lubricating oil can be supplemented without disassembling the machine.
[0034] Specifically, please refer to Figure 7 and Figure 8 The cooler comprises a shell cover 19, a flow guide core installed in the shell cover 19, and an inlet cover 20 installed at the inlet end of the flow guide core. A cooling cavity is formed between the outer wall of the inlet cover 20 and the flow guide core. The shell cover 19 is provided with an inlet pipe 21 and an outlet pipe 22 communicating with the cooling cavity. The flow guide core comprises a plurality of spiral flow guide pipes 23. The cross section of the spiral flow guide pipe 23 is in the shape of a hollow cross. The outlet end of the communication oil way 7 communicates with the inside of the shell cover 19. A collection cavity is formed between the outlet end of the spiral flow guide pipe 23 and the shell cover 19. The inlet end of the communication oil way 7 communicates with the collection cavity. Further, when the outer diameter of the spiral flow guide pipe 23 is constant, the cross section of the spiral flow guide pipe 23 is in the shape of a hollow cross. The heat exchange area of the spiral flow guide pipe 23 is increased, and the volume of the cooling cavity is increased, thereby improving the cooling effect of the lubricating oil flowing through the spiral flow guide pipe 23.
[0035] The communication oil way 7 is arranged outside the shell 1. The lubricating oil flowing through the communication oil way 7 can be cooled by external air. The filter 18 can filter part of the impurities in the lubricating oil, thereby improving the purity of the lubricating oil and reducing the wear of the end of the male rotor and the female rotor. External cold water or the like can be injected into the cooling cavity through the inlet pipe 21. The lubricating oil in the communication oil way 7 is dispersed into each spiral flow guide pipe 23 through the inlet cover 20. The spiral flow guide pipe 23 is in the shape of a spiral, and the cross section is in the shape of a hollow cross. The lubricating oil is fully heat-exchanged with the cold water in the cooling cavity during the process of flowing through the spiral flow guide pipe 23, thereby further reducing the oil temperature of the lubricating oil and avoiding the lubricating oil in the first lubricating cavity 5 and the second lubricating cavity 6 from being too hot.
[0036] The use process of the lubricating oil system of the semi-hermetic screw compressor is as follows: the lubricating oil is injected into the first lubricating cavity 5 and the second lubricating cavity 6, the lubricating oil in the first lubricating cavity 5 is pumped into the second lubricating cavity 6 through the hollow oil way 8 by the circulating pressurizing mechanism, the lubricating oil is returned to the first lubricating cavity 5 through the communicating oil way 7, the filter 18 on the communicating oil way 7 can filter the lubricating oil, the cooler can cool the lubricating oil, so that the lubricating oil in the first lubricating cavity 5 and the second lubricating cavity 6 is mixed with each other, the temperature in the first lubricating cavity 5 and the second lubricating cavity 6 is balanced, the cathode rotor 3 can be cooled and uniformly heated during the lubricating oil flowing through the hollow oil way 8; the homogeneous and uniform heating treatment of the lubricating oil in the first lubricating cavity 5 and the second lubricating cavity 6 is realized, and the auxiliary cooling effect of the compression cavity 4 is realized; the lubricating treatment of the cathode rotor and the anode rotor by the lubricating oil is not needed, and the subsequent oil-gas separation equipment investment is reduced.
[0037] Embodiment 2
[0038] Please refer to Figure 9 The circulating pressurizing mechanism in the embodiment can also be an oil pump 34 arranged directly outside the shell 1, an oil inlet of the oil pump 34 is communicated with one end of the hollow oil way 8 through a pipeline, and an oil outlet of the oil pump 34 is directly communicated with the second lubricating cavity 6 through a pipeline, so that the lubricating oil in the first lubricating cavity 5 is pumped into the second lubricating cavity 6 through the hollow oil way 8 by the oil pump.
[0039] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on terms should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated; can be mechanical connection, also can be electric connection or each other can communicate; can be direct connection, also can be indirectly connected through intermediate medium, can be the communication or the interaction relationship of two elements of two elements inside, unless another definite limitation. For ordinary skilled in the art, the above terms can be understood according to the specific meaning of the utility model in specific circumstances.
Claims
1. A semi-hermetic screw compressor lubricating oil system, characterized in that, The utility model provides a kind of rotary piston compressor, including shell (1), anode rotor (2) and cathode rotor (3), the middle part of the shell (1) is equipped with compression cavity (4), the both sides of the shell (1) are equipped with first lubricating cavity (5) and second lubricating cavity (6) isolated with compression cavity (4), the anode rotor (2) and cathode rotor (3) are rotatably installed in compression cavity (4), the both ends of the anode rotor (2) and cathode rotor (3) respectively extend into first lubricating cavity (5) and second lubricating cavity (6);It further includes communication oil circuit (7) and circulating pressurizing mechanism, one end of the communication oil circuit (7) is communicated with first lubricating cavity (5), the other end of the communication oil circuit (7) is communicated with second lubricating cavity (6), the hollow oil circuit (8) of the communication of first lubricating cavity (5) and second lubricating cavity (6) is equipped in the cathode rotor (3), the input end of the circulating pressurizing mechanism is communicated with the output end of hollow oil circuit (8), and the circulating pressurizing mechanism injects into second lubricating cavity (6) after pressurizing the lubricating oil in hollow oil circuit (8).
2. A semi-hermetic screw compressor lubricating oil system according to claim 1, characterized in that, The circulating pressurizing mechanism includes sealing shell (9) fixedly installed in second lubricating cavity (6), drive shaft (10) rotatably installed in sealing shell (9), eccentric shaft (11) fixedly installed at eccentric position of drive shaft (10), transmission handle (12) and piston (13) rotatably installed on eccentric shaft (11), the end of drive shaft (10) is fixedly connected with anode rotor (2), the sealing shell (9) is equipped with sliding chamber (14) matched with the outer wall of piston (13), the piston (13) is slidably installed in sliding chamber (14), the transmission handle (12) is rotatably connected with piston (13), the three-way pipe (15) communicated with sliding chamber (14) is installed on the sealing shell (9), the first one-way valve (16) allowing the lubricating oil in sliding chamber (14) to flow out into second lubricating cavity (6) is installed on the top outflow end of three-way pipe (15), and the second one-way valve (17) allowing the lubricating oil in hollow oil circuit (8) to enter into sliding chamber (14) is installed at one inflow end of three-way pipe (15).
3. A lubricating oil system for a semi-hermetic screw compressor according to claim 1 or 2, characterized in that, The communication oil circuit (7) is external to the shell (1).
4. A lubricating oil system for a semi-hermetic screw compressor according to claim 3, characterized in that, The filter (18) for filtering lubricating oil is installed on the communication oil circuit (7).
5. A semi-hermetic screw compressor lubricating oil system according to claim 4, characterized in that, The cooler for cooling lubricating oil is installed on the communication oil circuit (7).
6. A semi-hermetic screw compressor lubricating oil system according to claim 5, characterized in that, The cooler includes shell cover (19), flow guide core installed in shell cover (19) and inflow cover (20) installed at inflow end of flow guide core, the inflow cover (20) and flow guide core form cooling cavity between outer wall and flow guide core, the inflow pipe (21) and outflow pipe (22) communicated with cooling cavity are provided on the shell cover (19), the flow guide core includes a plurality of spiral flow guide pipes (23), the cross section of the plurality of spiral flow guide pipes (23) is hollow cross shape, the outflow end of the communication oil circuit (7) is communicated with the inside of shell cover (19), the outflow end of the spiral flow guide pipe (23) and shell cover (19) form collection cavity, and the inflow end of the communication oil circuit (7) is communicated with collection cavity.
7. A lubricating oil system for a semi-hermetic screw compressor according to claim 1, characterized in that, The oil supplement mechanism comprises a mounting base (24) mounted on the shell (1), a cylindrical shell (25) mounted on the mounting base (24), a plug column (26) slidingly mounted in the cylindrical shell (25), an oil supplement pipeline (27) and an oil inlet pipeline (28), the oil supplement pipeline (27) is communicated with the inside of the cylindrical shell (25), a third one-way valve (29) is mounted on the oil supplement pipeline (27) to allow lubricating oil in the oil supplement pipeline (27) to flow into the cylindrical shell (25) in one direction, the oil inlet pipeline (28) is communicated with the inside of the cylindrical shell (25), the oil outlet end of the oil inlet pipeline (28) is communicated with the communication oil way (7), and a fourth one-way valve (30) is arranged on the oil inlet pipeline (28) to allow lubricating oil to flow into the communication oil way (7) through the oil inlet pipeline (28) in one direction.
8. A semi-hermetic screw compressor lubricating oil system according to claim 7, characterized in that, The oil supplement mechanism further comprises a driving member for driving the plug column (26), the driving member comprises a supporting rod (31) hingedly mounted on the mounting base (24) and a connecting rod (32) hingedly connected at one end to the supporting rod (31) and at the other end to the end of the plug column (26), and a handle (33) is fixedly mounted on the connecting rod (32).