Two-stage screw compressor

Abstract

The utility model relates to the technical field of screw compressors, and discloses a two-stage screw compressor which comprises a shell, the interior of the shell is divided into a compression cavity and a supporting lubricating cavity, a first-stage screw and a second-stage screw are arranged in the compression cavity, a top cover is fixedly installed on the top of the shell, and a first-stage screw and a second-stage screw are arranged in the top cover. Transmission shafts in the first-stage screw rod and the second-stage screw rod extend into the supporting and lubricating cavity; and a lubricating mechanism is arranged on the shell. The lubricating mechanism comprises a spraying head, the spraying head is arranged in the supporting lubricating cavity, high-pressure air flow is introduced from an air inlet pipe, lubricating oil is added from a lubricating oil inlet pipe, the high-pressure air flow and the lubricating oil are converged in the spraying head, then mist spray is generated, the mist spray is sprayed out from a front spraying face and a rear spraying face, the gear and the bearing can be rapidly stained, and the gear and the bearing can be rapidly lubricated. And the gear and the bearing can be quickly lubricated without waiting for self-flowing of lubricating oil, so that the lubricating efficiency is improved, and the amount of the lubricating oil is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of screw compressors, in particular to a two-stage screw compressor. Background Art

[0002] The oil-injected screw air compressor adopts two-stage compression to improve the energy efficiency of the compressor. The improvement of energy efficiency is based on the following two main reasons: first, the compression ratio of each stage is reduced, which improves the volumetric efficiency and reduces the internal leakage of each stage; second, the amount of oil injection in the first stage is reduced, which improves the suction efficiency of the main engine, and the oil injection to the second-stage screw reduces the injection temperature, so that the paint mixture is fully cooled, and the process index of the compression process is further reduced, thereby improving the energy efficiency of the compressor;

[0003] Existing Chinese patent CN205895593U discloses a two-stage compression screw compressor. The two-stage compression screw compressor is provided with a partition plate in the body. The partition plate divides the body cavity into two parts: a compression chamber and a support lubrication chamber. A high-pressure air outlet pipe and a compression oil return pipe are provided on one side of the compression chamber. A bearing oil inlet pipe and a bearing oil outlet pipe are provided on the outer sides of the left and right support lubrication chambers respectively. The left and right support lubrication chambers opposite to the inlet and outlet pipes are connected by a connecting pipe. In this way, the screw lubrication and bearing lubrication in the compression chamber are divided into two independent lubrication systems, thereby ensuring the stability of the bearing operation.

[0004] However, in actual use, the amount of lubricating oil required by the gears and bearings as transmission components is very small. In order to achieve the flow of lubricating oil in the two supporting lubrication chambers, the above-mentioned two-stage compression screw compressor requires more lubricating oil to achieve flow and fully lubricate the bearings. Utility Model Content

[0005] The purpose of the present invention is to provide a two-stage screw compressor to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a two-stage screw compressor, comprising a housing, the interior of the housing being divided into a compression chamber and a support lubrication chamber, a primary screw and a secondary screw being disposed in the compression chamber, a top cover being fixedly mounted on the top of the housing, the drive shafts in the primary screw and the secondary screw extending into the support lubrication chamber, and a lubrication mechanism being disposed on the housing;

[0007] The lubrication mechanism includes a spray head, which is arranged in the support lubrication cavity. The top of the spray head is connected to a lubricating oil inlet pipe and an air intake pipe. The top ends of the lubricating oil inlet pipe and the air intake pipe extend out from the support lubrication cavity. The bottom of the spray head is provided with a front spray surface and a rear spray surface. The front spray surface faces the gear in the support lubrication cavity, and the rear spray surface faces the bearing in the support lubrication cavity.

[0008] Furthermore, the interior of the compression chamber is connected to a high-pressure air pipe, the top end of the high-pressure air pipe extends from the outer shell, an oil-gas separator is fixedly installed on the top of the top cover, the top end of the high-pressure air pipe is connected to the input end of the top cover, the oil outlet end of the oil-gas separator is connected to an oil return pipe, and the bottom end of the oil return pipe is connected to the interior of the outer shell.

[0009] Furthermore, an oil heat dissipation box is sleeved on the outer wall of the oil return pipe, and the heat dissipation box is fixedly installed on the top of the top cover.

[0010] Furthermore, a three-way valve is provided at the gas outlet of the oil-gas separator, an air distribution pipe is provided at one end of the three-way valve, and an end of the air distribution pipe away from the three-way valve is connected to the air inlet pipe.

[0011] Furthermore, an exhaust pipe is provided at the other end of the three-way valve, and a flow valve is provided on the gas distribution pipe.

[0012] Furthermore, an oil drain hole is provided at the bottom of the support lubrication cavity, and a sealing plug is provided in the oil drain hole.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. By introducing high-pressure airflow from the air inlet pipe and adding lubricating oil from the lubricating oil inlet pipe, the high-pressure airflow and lubricating oil meet in the spray head, and then generate spray. The spray is sprayed from the front spray surface and the rear spray surface, which can quickly stain the gears and bearings and quickly lubricate the gears and bearings without waiting for the lubricating oil to flow by itself, thereby improving lubrication efficiency and saving the amount of lubricating oil;

[0015] 2. After the oil and gas are separated by the oil-gas separator, the high-pressure airflow enters the air distribution pipe from the three-way valve and then enters the air intake pipe. No additional air source structure is required. Because only a small part of the high-pressure airflow generated by the compressor is needed to atomize the lubricating oil, a flow valve is used to control the high-pressure airflow entering the air distribution pipe, and most of the high-pressure airflow is discharged from the exhaust pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 For this utility model Figure 1 A schematic diagram of the structure from the bottom looking up;

[0018] Figure 3 For this utility model Figure 1 A schematic diagram of the structure in a top cross-sectional view;

[0019] Figure 4For this utility model Figure 1 Structural diagram of the front sectional view;

[0020] Figure 5 It is a structural diagram of the lubricating mechanism couple of the utility model.

[0021] In the figure: 1. Outer casing; 2. Top cover; 3. Primary screw; 4. Secondary screw; 5. Compression chamber; 6. Support lubrication chamber; 7. Lubrication mechanism; 701. Lubricating oil inlet pipe; 702. Spray head; 703. Front spraying surface; 704. Rear spraying surface; 705. Air inlet pipe; 8. High-pressure air pipe; 9. Oil-gas separator; 10. Three-way valve; 11. Air distribution pipe; 12. Flow valve; 13. Sealing plug; 14. Oil return pipe; 15. Radiator. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] See also Figure 1-Figure 5 The utility model provides a technical solution: a two-stage screw compressor, comprising a housing 1, the interior of the housing 1 being divided into a compression chamber 5 and a support lubrication chamber 6, a primary screw 3 and a secondary screw 4 being arranged in the compression chamber 5, a top cover 2 being fixedly mounted on the top of the housing 1, the transmission shafts in the primary screw 3 and the secondary screw 4 extending into the support lubrication chamber 6, and a lubrication mechanism 7 being provided on the housing 1;

[0024] The lubricating mechanism 7 includes a spray head 702, which is arranged in the support lubrication chamber 6. The top of the spray head 702 is connected to a lubricating oil inlet pipe 701 and an air inlet pipe 705. The top ends of the lubricating oil inlet pipe 701 and the air inlet pipe 705 extend out of the support lubrication chamber 6. The bottom of the spray head 702 is provided with a front spray surface 703 and a rear spray surface 704. The front spray surface 703 faces the gears in the support lubrication chamber 6, and the rear spray surface 704 faces the bearings in the support lubrication chamber 6. By introducing a high-pressure airflow from the air inlet pipe 705 and adding lubricating oil from the lubricating oil inlet pipe 701, the high-pressure airflow and the lubricating oil meet in the spray head 702, and then a spray is generated. The spray is sprayed from the front spray surface 703 and the rear spray surface 704, which can quickly stain the gears and bearings, and can quickly lubricate the gears and bearings without waiting for the lubricating oil to flow by itself, thereby improving the lubrication efficiency and saving the amount of lubricating oil.

[0025] The interior of the compression chamber 5 is connected to a high-pressure air pipe 8, the top end of the high-pressure air pipe 8 extends from the housing 1, and an oil-gas separator 9 is fixedly installed on the top of the top cover 2. The top end of the high-pressure air pipe 8 is connected to the input end of the top cover 2, and the oil outlet end of the oil-gas separator 9 is connected to an oil return pipe 14. The bottom end of the oil return pipe 14 is connected to the interior of the housing 1. The high-pressure air mixed with lubricating oil in the compression chamber 5 is introduced into the oil-gas separator 9 through the high-pressure air pipe 8. After the oil and gas are separated by the oil-gas separator 9, the lubricating oil flows back into the compression chamber 5 from the oil return pipe 14 to continue lubricating the primary screw 3 and the secondary screw 4.

[0026] The outer wall of the oil return pipe 14 is sheathed with an oil heat dissipation box 15, which is fixedly mounted on the top of the top cover 2. The heat dissipation box 15 is provided to cool the lubricating oil flowing through the oil return pipe 14 to prevent the lubricating oil from being too hot.

[0027] The gas outlet of the oil-gas separator 9 is connected to a three-way valve 10, and one end of the three-way valve 10 is connected to an air distribution pipe 11. The end of the air distribution pipe 11 away from the three-way valve 10 is connected to the air inlet pipe 705. After the oil-gas separator 9 separates the oil and gas, the high-pressure air flows from the three-way valve 10 into the air distribution pipe 11 and then into the air inlet pipe 705, without the need for an additional air source structure.

[0028] The other end of the three-way valve 10 is connected to an exhaust pipe. A flow valve 12 is provided on the air distribution pipe 11. Because only a small part of the high-pressure airflow generated by the compressor is needed to atomize the lubricating oil, the flow valve 12 is used to control the high-pressure airflow entering the air distribution pipe 11, and most of the high-pressure airflow is discharged from the exhaust pipe.

[0029] An oil drain hole is provided at the bottom of the support lubrication cavity 6, and a sealing plug 13 is provided in the oil drain hole. The oil drain hole is provided for regularly draining excess lubricating oil in the support lubrication cavity 6, and the sealing plug 13 is provided to seal the oil drain hole.

[0030] Working principle: When in use, the high-pressure airflow generated by the operation of the first-stage screw 3 and the second-stage screw 4 enters the oil-gas separator 9 from the high-pressure air pipe 8. After the oil and gas are separated by the oil-gas separator 9, the lubricating oil flows back to the compression chamber 5 from the return oil pipe 14. The high-pressure airflow is diverted from the three-way valve 10, and part of it enters the air inlet pipe 705 from the air diversion pipe 11, and part of it is discharged from the exhaust pipe. It is only necessary to add lubricating oil to the spray head 702 from the lubricating oil inlet pipe 701. The lubricating oil will come into contact with the high-pressure airflow and be atomized, and then be sprayed from the front spray surface 703 and the rear spray surface 704, so that the lubricating oil can be quickly sprayed onto the gears and bearings, thereby improving the lubrication efficiency and saving the amount of lubricating oil.

[0031] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A two-stage screw compressor comprising a housing (1), characterized in that: The interior of the housing (1) is divided into a compression chamber (5) and a support lubrication chamber (6); a primary screw (3) and a secondary screw (4) are provided in the compression chamber (5); a top cover (2) is fixedly mounted on the top of the housing (1); the transmission shafts in the primary screw (3) and the secondary screw (4) extend into the support lubrication chamber (6); and a lubrication mechanism (7) is provided on the housing (1); The lubricating mechanism (7) comprises a spray head (702), the spray head (702) being arranged in the support lubrication cavity (6), the top of the spray head (702) being connected to a lubricating oil inlet pipe (701) and an air inlet pipe (705), the top ends of the lubricating oil inlet pipe (701) and the air inlet pipe (705) extending out from the support lubrication cavity (6), the bottom of the spray head (702) being provided with a front spray surface (703) and a rear spray surface (704), the front spray surface (703) facing the gear in the support lubrication cavity (6), and the rear spray surface (704) facing the bearing in the support lubrication cavity (6).

2. The two-stage screw compressor according to claim 1, characterized in that: The interior of the compression chamber (5) is connected to a high-pressure air pipe (8), the top end of the high-pressure air pipe (8) extends from the housing (1), an oil-gas separator (9) is fixedly installed on the top of the top cover (2), the top end of the high-pressure air pipe (8) is connected to the input end of the top cover (2), the oil outlet end of the oil-gas separator (9) is connected to an oil return pipe (14), and the bottom end of the oil return pipe (14) is connected to the interior of the housing (1).

3. The two-stage screw compressor according to claim 2, characterized in that: An oil heat dissipation box (15) is sleeved on the outer wall of the oil return pipe (14), and the heat dissipation box (15) is fixedly installed on the top of the top cover (2).

4. The two-stage screw compressor according to claim 2, characterized in that: The gas outlet end of the oil-gas separator (9) is connected to a three-way valve (10), one end of the three-way valve (10) is connected to a gas distribution pipe (11), and the end of the gas distribution pipe (11) away from the three-way valve (10) is connected to the gas inlet pipe (705).

5. The two-stage screw compressor according to claim 4, characterized in that: The other end of the three-way valve (10) is connected to an exhaust pipe, and a flow valve (12) is provided on the gas distribution pipe (11).

6. The two-stage screw compressor according to claim 1, characterized in that: An oil drain hole is provided at the bottom of the supporting lubrication cavity (6), and a sealing plug (13) is provided in the oil drain hole.

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