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 compressor shell, a two-stage screw, a driving motor and a transmission gear, and a screw chamber is arranged in the middle of an inner cavity of the compressor shell; when the output end of the driving motor drives the two-stage screw to operate in the compressor shell through the transmission gear, the output end of the driving motor and the transmission shaft are in synchronous transmission through the tensioning wheel and the synchronous belt, so that turbine blades in the oil storage cylinder rotate synchronously; according to the two-stage screw compressor, lubricating oil in the oil storage cylinder can be guided into the screw chamber through the oil guide pipe via the filter element and is finally guided into the oil storage cylinder through the overflow holes in the screw chamber and the oil storage cylinder, so that the lubricating oil in the oil storage cylinder can circularly flow between the screw chamber, and the two-stage screw compressor can work while working; lubricating oil in the oil storage cylinder can synchronously and circularly flow, so that structural parts between the two stages of screws are lubricated and cooled.

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 screw compressor is a highly efficient and reliable positive displacement compressor, which is widely used in various industrial and refrigeration systems. The twin-screw compressor consists of two intermeshing rotors. Its structure is relatively simple, mainly consisting of a main machine (including yin and yang rotors, casing, etc.) and an auxiliary machine (oil system).

[0003] For example, the Chinese patent authorization announcement number is CN221257126U, "discloses an integrated two-stage screw compressor including a chassis, wherein a housing space is provided in the chassis, and the housing space includes a main engine room, a gear room and a motor room, wherein the gear room is located between the main engine room and the motor room, and the main engine room is adjacent to one side of the gear room";

[0004] The above-mentioned comparative document adds a gear chamber design to the chassis, and the design of the main engine room, gear chamber and motor chamber are connected as one, which not only ensures that the coaxiality between the motor output shaft and the main engine main shaft is within the predetermined range, but also makes the internal structure of the compressor compact;

[0005] However, when the above-mentioned two-stage screw compressor is in use, the lubricating oil inside the two-stage screw consumes a large amount of oil as the screw rotates at high speed. In order to ensure smooth operation of the screw, it needs to be replenished from time to time. When the compressor is not working, the lubricating oil filled inside will accumulate, oxidize and deteriorate, so that the lubricating oil inside the two-stage screw cannot be automatically filled and used according to demand. Utility Model Content

[0006] The utility model aims to provide a two-stage screw compressor, which can automatically fill lubricating oil into the screw chamber according to the actual working conditions of the compressor, thereby ensuring that the two-stage screw can be lubricated and cooled during operation.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a two-stage screw compressor, comprising a compressor housing, a two-stage screw, a drive motor, and a transmission gear. A screw chamber is arranged in the middle of the inner cavity of the compressor housing, a drive motor is arranged near the middle of the front of the inner cavity of the compressor housing, a synchronization mechanism is arranged at the front end of the compressor housing, a filter cartridge and an oil storage mechanism are fixedly installed on both sides of the compressor housing, the oil storage mechanism comprises an oil storage cartridge, an oil guide pipe is connected between the filter cartridge and the oil storage cartridge, a transmission shaft is rotatably installed in the inner wall of the oil storage cartridge, a turbine blade is fixedly sleeved at the back end of the transmission shaft, a tensioning wheel is fixedly sleeved at the output end of the drive motor and the front end of the transmission shaft, and overflow holes are respectively opened between the screw chamber, the filter cartridge and the oil storage cartridge.

[0008] Preferably, a gear chamber is provided at the position of the transmission gear on the compressor housing, and the transmission gear is installed on the inner side wall of the gear chamber.

[0009] Preferably, a heat exchanger is installed in the middle of the oil guide pipe, and the heat exchanger is used to cool the lubricating oil in the oil guide pipe.

[0010] Preferably, a sealing cover is fixedly installed at the open end of one end of the filter cartridge by bolts, and a filter element is installed in the inner cavity of the filter cartridge.

[0011] Preferably, an oil injection hole is fixedly installed on one side of the oil storage mechanism.

[0012] Preferably, synchronous belts are fixedly sleeved outside the two tension wheels.

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

[0014] When the two-stage screw rotates inside the compressor housing through the transmission gear at the output end of the driving motor in the present utility model, the output end of the driving motor and the transmission shaft are synchronously driven by the tension wheel and the synchronous belt, so that the turbine blades in the oil storage cylinder rotate synchronously, so that the lubricating oil in the oil storage cylinder can be introduced into the screw chamber through the oil guide pipe and the filter element, and finally introduced into the oil storage cylinder through the overflow hole at the screw chamber and the oil storage cylinder, so that the lubricating oil in the oil storage cylinder can circulate between the screw chambers. In this way, while the two-stage screw compressor is working, the lubricating oil in the oil storage cylinder can circulate synchronously, so that the structural parts between the two-stage screws are lubricated and cooled, and the problem that the two-stage screw compressor needs to be replenished irregularly is solved. When the compressor is not working, the filled lubricating oil will accumulate and oxidize and deteriorate, so that the lubricating oil inside the two-stage screw cannot be automatically filled and used according to requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0016] Figure 2 is a schematic diagram of the internal structure of the compressor housing in the present utility model;

[0017] Figure 3 is a front structural schematic diagram of the present utility model;

[0018] Figure 4 is Figure 2 a partial enlarged structural schematic diagram at A in

[0019] Figure 5 is Figure 2 a partial enlarged structural schematic diagram at B in

[0020] In the figure: 1. Compressor housing; 2. Two-stage screw; 3. Driving motor; 4. Synchronizing mechanism; 5. Oil guide pipe; 6. Filter cartridge; 7. Oil storage mechanism; 8. Overflow hole; 11. Screw chamber; 12. Gear chamber; 13. Transmission gear; 41. Synchronous belt; 42. Tensioning pulley; 51. Heat exchanger; 61. Filter element; 62. Sealing cover; 71. Oil storage cylinder; 72. Turbine blade; 720. Transmission shaft; 73. Oil injection hole. Detailed implementation mode

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Please refer to Figures 1-5 , the present invention provides a technical solution: a two-stage screw compressor, including a compressor housing 1, a two-stage screw 2, a driving motor 3, and a transmission gear 13. A screw chamber 11 is provided in the middle of the inner cavity of the compressor housing 1, a driving motor 3 is provided near the middle of the front of the inner cavity of the compressor housing 1, a synchronizing mechanism 4 is provided at the front end of the compressor housing 1, a filter cartridge 6 and an oil storage mechanism 7 are respectively fixedly installed on both sides of the compressor housing 1, the oil storage mechanism 7 includes an oil storage cylinder 71, and an oil guide pipe 5 is connected between the filter cartridge 6 and the oil storage cylinder 71;

[0023] A transmission shaft 720 is rotatably installed in the inner wall of the oil storage cylinder 71, a turbine blade 72 is fixedly sleeved on the back end of the transmission shaft 720, a tensioning pulley 42 is fixedly sleeved on the output end of the driving motor 3 and the front end of the transmission shaft 720 respectively, an overflow hole 8 is penetrated between the screw chamber 11 and the filter cartridge 6 and the oil storage cylinder 71 respectively, a one-way valve is installed at the overflow hole 8 between the screw chamber 11 and the oil storage cylinder 71, and the lubricating oil in the oil storage cylinder 71 can only flow into the screw chamber 11 through the oil guide pipe 5 and through the filter cartridge 6;

[0024] The transmission gear 13 includes two sets of driven gears and one set of driving gears. The driving gear is fixedly installed on the output end of the driving motor 3, and the two sets of driven gears are fixedly installed on the connecting shafts at the ends of the two-stage screw 2. The output end of the driving motor 3 drives the driving gear to drive the two sets of driven gears, so that the two-stage screw 2 can rotate synchronously inside the screw chamber 11;

[0025] When the two-stage screw 2 runs inside the compressor housing 1 driven by the transmission gear 13 at the output end of the drive motor 3, the output end of the drive motor 3 and the transmission shaft 720 are synchronously driven by the tension pulley 42 and the synchronous belt 41, so that the turbine blade 72 in the oil storage cylinder 71 rotates synchronously, enabling the lubricating oil in the oil storage cylinder 71 to be introduced into the screw chamber 11 through the oil guide pipe 5 and the filter element 61, and finally flowing into the oil storage cylinder 71 through the overflow hole 8 at the screw chamber 11 and the oil storage cylinder 71. Thus, the lubricating oil in the oil storage cylinder 71 can circulate between the screw chambers 11. In this way, while the two-stage screw 2 compressor is working, the lubricating oil in the oil storage cylinder 71 can circulate synchronously, lubricating and cooling the structural parts between the two-stage screws 2.

[0026] Among them, a gear chamber 12 is provided at the position of the transmission gear 13 on the compressor housing 1. The transmission gear 13 is installed on the inner side wall of the gear chamber 12. The output end of the drive motor 3 drives the driving gear to drive two groups of driven gears, enabling the two-stage screw 2 to rotate synchronously inside the screw chamber 11.

[0027] Among them, a heat exchanger 51 is installed in the middle of the oil guide pipe 5. The heat exchanger 51 is used to cool the lubricating oil in the oil guide pipe 5. When the lubricating oil in the screw chamber 11 is re-introduced into the oil storage cylinder 71 through the overflow hole 8 and then re-introduced into the screw chamber 11 through the filter element 61, it can be cooled by the heat exchanger 51, so that the lubricating oil entering the filter cylinder 6 and the screw chamber 11 can be cooled.

[0028] Among them, a sealing cover 62 is fixedly installed at the open end of one end of the filter cylinder 6 by bolts. A filter element 61 is installed in the inner cavity of the filter cylinder 6. By disassembling the bolts on the sealing cover 62, the filter element 61 in the filter cylinder 6 can be taken out and replaced. In this way, the filter element 61 can filter the lubricating oil before it enters the screw chamber 11, filtering out the metal debris mixed in the lubricating oil and preventing wear on the two-stage screw 2.

[0029] Among them, an oil injection hole 73 is fixedly installed on one side of the oil storage mechanism 7. Through the oil injection hole 73, a sufficient amount of lubricating oil can be introduced into the oil storage cylinder 71, reducing the frequency of irregular oil injection into the oil storage cylinder 71.

[0030] Among them, the two tension pulleys 42 are externally fixedly sleeved with a synchronous belt 41. When the two-stage screw 2 runs inside the compressor housing 1 driven by the transmission gear 13 at the output end of the drive motor 3, the output end of the drive motor 3 and the transmission shaft 720 are synchronously driven by the tension pulley 42 and the synchronous belt 41.

[0031] Working principle: When the screw compressor is in use, when the two-stage screw 2 is driven to rotate inside the compressor housing 1 through the transmission gear 13 at the output end of the driving motor 3, the output end of the driving motor 3 and the transmission shaft 720 are synchronously driven through the tensioning wheel 42 and the synchronous belt 41, so that the turbine blade 72 in the oil storage cylinder 71 rotates synchronously, so that the lubricating oil in the oil storage cylinder 71 can be introduced into the screw chamber 11 through the guide oil pipe 5 and the filter element 61, and finally introduced into the oil storage cylinder 71 through the overflow hole 8 at the screw chamber 11 and the oil storage cylinder 71, so that the lubricating oil in the oil storage cylinder 71 can circulate between the screw chambers 11. In this way, while the two-stage screw 2 compressor is working, the lubricating oil in the oil storage cylinder 71 can circulate synchronously, so that the structural parts between the two-stage screws 2 are lubricated and cooled;

[0032] After the lubricating oil in the screw chamber 11 is re-introduced into the oil storage cylinder 71 through the overflow hole 8 and then introduced into the screw chamber 11 through the filter element 61 again, it can be cooled by the heat exchanger 51, so that the lubricating oil entering the filter cylinder 6 and the screw chamber 11 can be cooled.

[0033] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes and modifications can be made to these embodiments without departing from the principle of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A two-stage screw compressor, comprising a compressor housing (1), a two-stage screw (2), a drive motor (3), and a transmission gear (13), characterized in that: A screw chamber (11) is provided in the middle of the inner cavity of the compressor housing (1), a drive motor (3) is provided near the middle of the front of the inner cavity of the compressor housing (1), a synchronization mechanism (4) is provided at the front end of the compressor housing (1), a filter cartridge (6) and an oil storage mechanism (7) are fixedly installed on both sides of the compressor housing (1), the oil storage mechanism (7) comprises an oil storage cartridge (71), an oil guide pipe (5) is connected between the filter cartridge (6) and the oil storage cartridge (71), a transmission shaft (720) is rotatably installed in the inner wall of the oil storage cartridge (71), a turbine blade (72) is fixedly sleeved on the back end of the transmission shaft (720), a tensioning wheel (42) is fixedly sleeved on the output end of the drive motor (3) and the front end of the transmission shaft (720), and overflow holes (8) are respectively opened between the screw chamber (11) and the filter cartridge (6) and the oil storage cartridge (71).

2. A two-stage screw compressor according to claim 1, characterized in that: The compressor housing (1) is provided with a gear chamber (12) at the location of the transmission gear (13), and the transmission gear (13) is mounted on the inner side wall of the gear chamber (12).

3. A two-stage screw compressor according to claim 2, characterized in that: A heat exchanger (51) is installed in the middle of the oil guide pipe (5), and the heat exchanger (51) is used to cool the lubricating oil in the oil guide pipe (5).

4. A two-stage screw compressor according to claim 3, characterized in that: A sealing cover (62) is fixedly installed at an opening at one end of the filter cartridge (6) by means of bolts, and a filter element (61) is installed in the inner cavity of the filter cartridge (6).

5. A two-stage screw compressor according to claim 4, characterized in that: An oil filling hole (73) is fixedly mounted on one side of the oil storage mechanism (7).

6. A two-stage screw compressor according to claim 5, characterized in that: The external fixed sleeves of the two sets of tension wheels (42) are provided with synchronous belts (41).

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