Two-stage compression screw type air compressor

Abstract

The invention relates to the technical field of air compressors, in particular to a two-stage compression screw type air compressor which comprises a compression cavity, an upper compression screw and a lower compression screw are arranged in the compression cavity, a driving motor is arranged on the side face of the compression cavity, two partition plates are arranged in the compression cavity at intervals, and first through holes are formed in the two partition plates. A bent plate is fixedly mounted on the lower-layer partition plate, and a second through hole communicated with the first through hole in the lower-layer partition plate is formed in the bent plate; an installation gap is formed between the bent plate and the lower-layer partition plate, a circulation gap for primary compressed air to flow downwards is formed between the bent plate and the upper-layer partition plate, an oil spraying pipe is arranged at the installation gap, and a heat dissipation structure is arranged on the side face of the oil spraying pipe. And the temperature difference between oil sprayed into the compression cavity and air in the compression cavity can be increased, so that the interior of the compression cavity can be cooled more quickly.

Description

Technical Field

[0001] The present invention relates to the technical field of air compressors, and particularly to a two-stage compression screw air compressor. Background Art

[0002] A screw air compressor is a positive displacement compressor. Its core working principle is to compress gas through the rotational movement of a pair of mutually meshing spiral rotors (screws); the compression process of a two-stage compression screw air compressor is that natural air enters the first-stage compression through an air filter, mixes with a small amount of lubricating oil in the compression chamber, and at the same time compresses the mixed gas to the inter-stage pressure; the compressed gas enters the cooling channel and contacts a large amount of oil mist (lubricating oil), thereby greatly reducing the temperature; the cooled compressed gas enters the second-stage rotor for secondary compression and is compressed to the final exhaust pressure; Usually, after the lubricating oil and air complete heat exchange, they will be collected together for recycling. However, this recycled lubricating oil needs to be cooled and filtered using a heat dissipation structure before being sprayed into the cooling channel again. However, this cooling method only cools the lubricating oil and does not cool the pipeline for transporting the lubricating oil. After the cooled lubricating oil is pumped into the transport pipeline, it will absorb heat (especially a section of the pipeline close to the compression chamber, which will have heat exchange with the compression chamber during use), which will reduce the cooling effect when the lubricating oil is sprayed into the cooling channel. Summary of the Invention

[0003] Technical Problems to be Solved Aiming at the above-mentioned drawbacks of the prior art, the present invention provides a two-stage compression screw air compressor, which can effectively solve the problem that in the prior art, usually after the lubricating oil and air complete heat exchange, they will be collected together for recycling. However, this recycled lubricating oil needs to be cooled and filtered using a heat dissipation structure before being sprayed into the cooling channel again. However, this cooling method only cools the lubricating oil and does not cool the pipeline for transporting the lubricating oil. After the cooled lubricating oil is pumped into the transport pipeline, it will absorb heat, which will reduce the cooling effect when the lubricating oil is sprayed into the cooling channel.

[0004] Technical Solutions To achieve the above object, the present invention is realized through the following technical solutions: The present invention provides a two-stage compression screw air compressor, including a compression chamber. Two sets of compression screws are arranged up and down inside the compression chamber. A driving motor for driving the compression screws is arranged on the side of the compression chamber. Two partitions are arranged at intervals inside the compression chamber. First through holes are arranged on both partitions. A bent plate is fixedly installed on the lower partition, and a second through hole communicating with the first through hole on the lower partition is arranged on the bent plate; An installation gap is formed between the bent plate and the lower partition board. A flow-through gap for the primary compressed air to flow downward is formed between the bent plate and the upper partition board. A spray oil pipe for spraying cooling oil into the interior of the flow-through gap is provided at the installation gap, and a heat dissipation structure is provided on the side surface of the spray oil pipe.

[0005] Further, a heat dissipation frame body is fixedly installed in the installation gap. The heat dissipation frame body is fixedly installed inside the installation gap. An oil spraying part communicated with the spray oil pipe is arranged inside the heat dissipation frame body. An oil spraying through hole communicated with the inside of the heat dissipation frame body is arranged on the bent plate. The bottom of the heat dissipation frame body is sealed, and a circulation outlet is arranged on one side of the heat dissipation frame body.

[0006] Further, a limiting block is arranged on the bent plate. The side of the limiting block facing the oil spraying through hole is inclined downward. The limiting block is used to guide the liquefied oil liquid to flow downward.

[0007] Further, two heat dissipation frame bodies are arranged at intervals. The lower parts of the two heat dissipation frame bodies are communicated with each other. A heat dissipation groove is formed between the two heat dissipation frame bodies. Two groups of spray oil pipes are provided. The two groups of spray oil pipes respectively extend into the interiors of the two heat dissipation frame bodies. The two groups of spray oil pipes are arranged at intervals up and down. The spray oil pipes are made of copper pipes.

[0008] Further, the heat dissipation structure includes a housing and two heat dissipation fans fixedly installed on the side of the housing away from the spray oil pipe. The two heat dissipation fans are arranged at intervals. A plurality of spray pipes are arranged between the two heat dissipation fans. The spray pipes are used to spray atomized water onto the side surfaces of the heat dissipation fans respectively.

[0009] Further, it further includes an air storage tank. The air storage tank is communicated with the air outlet below the compression cavity through an exhaust pipe. The air storage tank is used to store compressed gas. A storage barrel is fixedly installed on the side surface of the air storage tank. A delivery pipe is communicated and installed above the storage barrel. The other end of the delivery pipe is respectively communicated with a plurality of spray pipes. The storage barrel is used to supply spray water to the spray pipes.

[0010] Further, a spray pipe is communicated and installed at the bottom of the air storage tank. The spray pipe is used to release the condensed water in the air inside the air storage tank. The other end of the spray pipe is communicated with the bottom of the storage barrel. The spray pipe is used to convey the condensed water inside the air storage tank to the inside of the storage barrel. An electromagnetic control valve for controlling the on-off of the spray pipe is arranged on the spray pipe. A pressure relief valve and a water filling port are arranged above the storage barrel.

[0011] Further, a connecting sleeve is fixedly installed at the bottom of the inner wall of the storage barrel. The top of the connecting sleeve is sealed. A water outlet is arranged on the side surface of the connecting sleeve. The lower part of the connecting sleeve is communicated with the spray pipe. A filter plate is sleeved outside the connecting sleeve. The end of the delivery pipe extending into the storage barrel is directly above the connecting sleeve.

[0012] Beneficial effects The technical solution provided by the present invention has the following beneficial effects compared with the known public technology: 1. In the present invention, by fixedly installing a bent plate between two partition plates, a flow gap is formed between the bent plate and the upper partition plate for the gas at the tail of the first-stage compression space to enter the second-stage compression space. The gas at the tail of the first-stage compression space flows to one end where the second-stage compression starts through the flow gap. This can not only cool the first-stage compressed air to a certain extent by the lubricating oil, but also conveniently lubricate the second-stage compression screw. Before the oil enters the interior of the compression cavity, the heat dissipation structure cools the oil first, which can increase the temperature difference between the oil sprayed into the interior of the compression cavity and the air inside the compression cavity, enabling the interior of the compression cavity to cool down more quickly, cooling the lubricating oil and the compression cavity more accurately and efficiently, and being more energy-saving and environmentally friendly.

[0013] 2. In the present invention, by fixedly installing a heat dissipation frame inside the installation gap, and the interior of the heat dissipation frame is communicated with the interior of the flow gap. When the oil spray pipe sprays atomized lubricating oil into the flow gap during use, the excess lubricating oil can flow into the interior of the heat dissipation frame, avoiding the retention of lubricating oil inside the compression cavity. While the heat dissipation structure cools the oil spray pipe, it can also cool the outer surface of the heat dissipation frame, and can more quickly lower the surface temperature of the compression cavity.

[0014] 3. In the present invention, by fixedly installing a storage barrel on the side of the gas storage tank, the storage barrel supplies water to a plurality of spray pipes through a delivery pipe. By providing a spray pipe at the bottom of the gas storage tank and connecting the other end of the spray pipe to the bottom of the storage barrel, when it is necessary to release the liquefied water at the bottom of the gas storage tank, the compressed gas can be used to squeeze the water formed at the bottom of the gas storage tank into the storage barrel by opening the electromagnetic control valve, making full use of the liquefied water inside the gas storage tank. In addition, since the storage barrel is connected to the gas storage tank through the spray pipe, when it is necessary to spray water for cooling by the spray pipes, by briefly opening the electromagnetic control valve, the gas inside the gas storage tank can enter the interior of the storage barrel, increasing the air pressure intensity inside the storage barrel, enabling the water inside the storage barrel to spray out along the delivery pipe and the spray pipes, without the need to add additional extraction devices. Brief description of the drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the structure of another angle of the present invention; Figure 3 is a schematic diagram of the overall structure of the present invention with the drive motor removed; Figure 4 is a cross-sectional view of the compression cavity of the present invention; Figure 5 is a schematic diagram of the internal gas flow in the compression cavity of the present invention; Figure 6 is a schematic diagram of the overall structure of the bending plate of the present invention; Figure 7 is a schematic diagram of the overall structure of the storage barrel of the present invention; Figure 8 is a schematic diagram of the internal structure of the heat dissipation structure of the present invention; Figure 9 is a schematic diagram of the internal structure of the storage barrel of the present invention.

[0017] The reference numerals in the figure respectively represent: 1. Compression cavity; 101. Air inlet; 102. Air outlet; 11. Exhaust pipe; 12. Partition board; 1201. First through hole; 13. Bending plate; 1301. Second through hole; 1302. Installation gap; 1303. Oil injection through hole; 131. Limiting block; 14. Oil injection pipe; 141. Oil injection part; 15. Heat dissipation frame; 1501. Heat dissipation groove; 151. Circulation outlet; 2. Drive motor; 3. Gas storage tank; 31. Spray pipe; 311. Electromagnetic control valve; 4. Storage barrel; 41. Delivery pipe; 42. Pressure relief valve; 43. Water filling port; 44. Connecting sleeve; 4401. Water outlet; 45. Filter plate 45; 5. Heat dissipation structure; 51. Heat dissipation fan; 52. Spray pipe. Detailed implementation manners

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] The present invention will be further described below with reference to the embodiments.

[0020] To this end, an embodiment of the present invention provides a two-stage compression screw air compressor, the purpose of which is at least to cool the oil before the oil enters the inside of the compression cavity 1 by providing a heat dissipation structure 5, which can increase the temperature difference between the oil sprayed into the inside of the compression cavity 1 and the air inside the compression cavity 1.

[0021] Embodiment: A two-stage compression screw air compressor, as Figure 1 - Figure 4 shown, includes a compression cavity 1, an air inlet 101 is provided above the compression cavity 1, two sets of compression screws (forming a primary compression space and a secondary compression space respectively) are arranged inside the compression cavity 1, a driving motor 2 for driving the compression screws is arranged on the side of the compression cavity 1, two partition plates 12 are arranged at intervals inside the compression cavity 1, first through holes 1201 are arranged on both of the two partition plates 12, a bent plate 13 is fixedly installed on the lower partition plate 12, and a second through hole 1301 communicating with the first through hole 1201 on the lower partition plate 12 is arranged on the bent plate 13; An installation gap 1302 is formed between the bent plate 13 and the lower partition plate 12, a flow gap for the primary compressed air to flow downward is formed between the bent plate 13 and the upper partition plate 12, an oil spray pipe 14 for spraying cooling oil into the flow gap is arranged at the installation gap 1302, and a heat dissipation structure 5 is arranged on the side of the oil spray pipe 14.

[0022] In the present invention, by fixedly installing the bent plate 13 between the two partition plates 12, a flow gap for the gas at the tail of the primary compression space to enter the secondary compression space is formed between the bent plate 13 and the upper partition plate 12, so that the gas at the tail of the primary compression space flows from the flow gap to the starting end of the secondary compression space, facilitating secondary compression. At the same time, when the gas at the tail of the primary compression space flows through the flow gap, lubricating oil is sprayed at the installation gap 1302, which can not only cool the primary compressed air to a certain extent by the lubricating oil, but also conveniently lubricate the secondary compression screw; the heat dissipation structure 5 cools the oil before the oil enters the inside of the compression cavity 1, which can increase the temperature difference between the oil sprayed into the inside of the compression cavity 1 and the air inside the compression cavity 1, enabling the inside of the compression cavity 1 to cool down more quickly.

[0023] It should be noted that a lubricating oil return port is provided at the bottom of the compression cavity 1, and the excess lubricating oil will be discharged from the lubricating oil return port from the compression cavity 1. This structure is a common lubricating oil discharge method in the prior art and will not be elaborated in this application document.

[0024] Furthermore, as Figure 5 and Figure 6As shown, a heat dissipation frame 15 is fixedly installed within the installation gap 1302. The heat dissipation frame 15 is fixedly installed inside the installation gap 1302. An oil injection member 141 communicating with the oil injection pipe 14 is provided inside the heat dissipation frame 15. An oil injection through hole 1303 communicating with the inside of the heat dissipation frame 15 is provided on the bent plate 13. The bottom of the heat dissipation frame 15 is sealed. A circulation outlet 151 is provided on one side of the heat dissipation frame 15. The circulation outlet 151 can be used to release the excess lubricating oil inside the heat dissipation frame 15. A limiting block 131 is provided on the bent plate 13. The side of the limiting block 131 facing the oil injection through hole 1303 is inclined downward. The limiting block 131 is used to guide the liquefied oil liquid to flow downward.

[0025] Among them, by fixedly installing the heat dissipation frame 15 inside the installation gap 1302, and the inside of the heat dissipation frame 15 is communicated with the inside of the circulation gap. During use, when the oil injection pipe 14 sprays atomized lubricating oil into the circulation gap, the excess lubricating oil can flow into the inside of the heat dissipation frame 15, avoiding the retention of lubricating oil inside the compression cavity 1 (for example, the lubricating oil overflowing from the end of the oil injection pipe 14 will drip downward under the action of gravity into the heat dissipation frame 15). While the heat dissipation structure 5 cools the oil injection pipe 14, it can also cool the outer surface of the heat dissipation frame 15, and can more quickly reduce the surface temperature of the compression cavity 1.

[0026] Further, as Figure 6 shown, two heat dissipation frames 15 are arranged at intervals. The lower parts of the two heat dissipation frames 15 are communicated with each other. A heat dissipation groove 1501 is formed between the two heat dissipation frames 15. Two groups of oil injection pipes 14 are provided. The two groups of oil injection pipes 14 respectively extend into the two heat dissipation frames 15. The two groups of oil injection pipes 14 are arranged at intervals up and down. The oil injection pipe 14 is made of copper pipe.

[0027] Among them, by arranging two heat dissipation frames 15 at intervals, the gap between the two heat dissipation frames 15 can allow the heat dissipation air flow to pass through, which can increase the heat dissipation area of the outer surface of the heat dissipation frame 15, and can more quickly cool the heat dissipation frame 15 and the gas inside the heat dissipation frame 15. By using a copper pipe for the oil injection pipe 14, the lubricating oil inside the oil injection pipe 14 can be quickly cooled down, facilitating the lubricating oil to cool the inside of the compression cavity 1.

[0028] Further, as Figure 8 shown, the heat dissipation structure 5 includes a housing and two heat dissipation fans 51 fixedly installed on the side of the housing away from the oil injection pipe 14. The two heat dissipation fans 51 are arranged at intervals. A plurality of spray pipes 52 are arranged between the two heat dissipation fans 51. The spray pipes 52 are used to spray atomized water onto the sides of the heat dissipation fans 51 respectively.

[0029] Among them, by spraying atomized water in the middle of the two radiating fans 51, the atomized water can follow the air flow and contact the spray oil pipe 14 and the radiating housing 15, which can further increase the heat dissipation effect on the radiating housing 15 and the spray oil pipe 14 (since the lubricating oil inside the spray oil pipe 14 is recycled, after being used for a period of time, the outer wall of the spray oil pipe 14 will be heated to a certain temperature). During the evaporation process, the atomized water will absorb the high temperature near the spray oil pipe 14 and the radiating housing 15, and the lubricating oil inside the spray oil pipe 14 will cool down more quickly.

[0030] Furthermore, as Figure 7 shown, it further includes an air storage tank 3. The air storage tank 3 is communicated with the air outlet 102 below the compression cavity 1 through an exhaust pipe 11. The air storage tank 3 is used for storing compressed gas. A storage barrel 4 is fixedly installed on the side of the air storage tank 3. A delivery pipe 41 is communicated and installed above the storage barrel 4. The other end of the delivery pipe 41 is respectively communicated with a plurality of spray pipes 52. The storage barrel 4 is used for supplying spray water to the spray pipes 52. A spray pipe 31 is communicated and installed at the bottom of the air storage tank 3. The spray pipe 31 is used for releasing the condensed water in the air inside the air storage tank 3. The other end of the spray pipe 31 is communicated with the bottom of the storage barrel 4. The spray pipe 31 is used for transporting the condensed water inside the air storage tank 3 into the storage barrel 4. An electromagnetic control valve 311 for controlling the on / off of the spray pipe 31 is arranged on the spray pipe 31. A pressure relief valve 42 (for relieving pressure when the air pressure inside the storage barrel 4 is too high) and a water filling port 43 (for filling water into the storage barrel 4 when the water level inside the storage barrel 4 drops) are arranged above the storage barrel 4.

[0031] Among them, by fixedly installing the storage barrel 4 on the side of the air storage tank 3, the storage barrel 4 supplies water to a plurality of spray pipes 52 through the delivery pipe 41. By arranging the spray pipe 31 at the bottom of the air storage tank 3 and communicating the other end of the spray pipe 31 with the bottom of the storage barrel 4, when it is necessary to release the liquefied water at the bottom of the air storage tank 3, the compressed gas can be used to squeeze the water formed at the bottom of the air storage tank 3 into the storage barrel 4 by opening the electromagnetic control valve 311, so that the liquefied water inside the air storage tank 3 can be fully utilized. In addition, since the storage barrel 4 is communicated with the air storage tank 3 through the spray pipe 31, when it is necessary to spray water for cooling by the spray pipes 52, by briefly opening the electromagnetic control valve 311, the gas inside the air storage tank 3 can enter the inside of the storage barrel 4, increasing the air pressure intensity inside the storage barrel 4, and enabling the water inside the storage barrel 4 to spray out along the delivery pipe 41 and the spray pipes 52, without the need to add an additional extraction device.

[0032] Furthermore, as Figure 9As shown, a connecting sleeve 44 is fixedly installed at the bottom of the inner wall of the storage bucket 4. The top of the connecting sleeve 44 is sealed. A water outlet 4401 is provided on the side of the connecting sleeve 44. The lower part of the connecting sleeve 44 is communicated with the spraying pipe 31. A filter plate 45 is sleeved outside the connecting sleeve 44. One end of the conveying pipe 41 extending into the storage bucket 4 is directly above the connecting sleeve 44.

[0033] Among them, by arranging the connecting sleeve 44 inside the storage bucket 4, the water at the spraying pipe 31 can be conveniently introduced to the bottom of the storage bucket 4. By arranging the filter plate 45 outside the connecting sleeve 44, the water flowing out of the spraying pipe 31 can be filtered to prevent the particulate matter in the water from blocking the spraying pipe 52 during use.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A two-stage compression screw air compressor, comprising a compression cavity (1), inside which there are two sets of compression screws arranged up and down. A drive motor (2) for driving the compression screws is arranged on the side of the compression cavity (1). Two partitions (12) are arranged at intervals inside the compression cavity (1) up and down, and first through holes (1201) are arranged on both of the two partitions (12). It is characterized in that, A bent plate (13) is fixedly installed on the lower partition plate (12), and a second through hole (1301) communicating with the first through hole (1201) on the lower partition plate (12) is arranged on the bent plate (13); An installation gap (1302) is formed between the bent plate (13) and the lower partition plate (12), a flow-through gap for the primary compressed air to flow downward is formed between the bent plate (13) and the upper partition plate (12), an oil spray pipe (14) for spraying cooling oil into the flow-through gap is arranged at the installation gap (1302), and a heat dissipation structure (5) is arranged on the side surface of the oil spray pipe (14).

2. The two-stage compression screw air compressor according to claim 1, wherein, A heat dissipation frame body (15) is fixedly installed in the installation gap (1302), the heat dissipation frame body (15) is fixedly installed inside the installation gap (1302), an oil spraying part (141) communicated with the oil spray pipe (14) is arranged inside the heat dissipation frame body (15), an oil spraying through hole (1303) communicated with the inside of the heat dissipation frame body (15) is arranged on the bent plate (13), the bottom of the heat dissipation frame body (15) is sealed, and a circulation outlet (151) is arranged on one side of the heat dissipation frame body (15).

3. The two-stage compression screw air compressor according to claim 2, characterized in that, A limiting block (131) is arranged on the bent plate (13), the side of the limiting block (131) facing the oil spraying through hole (1303) is inclined downward, and the limiting block (131) is used for guiding the liquefied oil liquid to flow downward.

4. The two-stage compression screw air compressor according to claim 3, characterized in that, Two heat dissipation frame bodies (15) are arranged at intervals, the lower parts of the two heat dissipation frame bodies (15) are communicated with each other, a heat dissipation groove (1501) is formed between the two heat dissipation frame bodies (15), two groups of oil spray pipes (14) are arranged, the two groups of oil spray pipes (14) respectively extend into the two heat dissipation frame bodies (15), the two groups of oil spray pipes (14) are arranged at intervals up and down, and the oil spray pipes (14) are made of copper pipes.

5. The two-stage compression screw air compressor according to claim 4, characterized in that, The heat dissipation structure (5) includes a housing and two heat dissipation fans (51) fixedly installed on the side of the housing away from the oil spray pipe (14), the two heat dissipation fans (51) are arranged at intervals, a plurality of spray pipes (52) are arranged between the two heat dissipation fans (51), and the spray pipes (52) are used for spraying atomized water to the side surfaces of the heat dissipation fans (51) respectively.

6. The two-stage compression screw air compressor according to claim 5, characterized in that, It further includes an air storage tank (3), the air storage tank (3) is communicated with an air outlet (102) below the compression cavity (1) through an exhaust pipe (11), the air storage tank (3) is used for storing compressed gas, a storage barrel (4) is fixedly installed on the side surface of the air storage tank (3), a conveying pipe (41) is communicated and installed above the storage barrel (4), the other end of the conveying pipe (41) is respectively communicated with a plurality of spray pipes (52), and the storage barrel (4) is used for supplying spray water to the spray pipes (52).

7. The two-stage compression screw air compressor according to claim 6, characterized in that, A spray pipe (31) is connected and installed at the bottom of the gas storage tank (3). The spray pipe (31) is used to release the condensed water in the air inside the gas storage tank (3). The other end of the spray pipe (31) is connected to the bottom of the storage barrel (4). The spray pipe (31) is used to transport the condensed water inside the gas storage tank (3) into the storage barrel (4). An electromagnetic control valve (311) for controlling the on / off of the spray pipe (31) is arranged on the spray pipe (31). A pressure relief valve (42) and a water filling port (43) are arranged above the storage barrel (4).

8. A two-stage compression screw air compressor according to claim 7, characterized in that, A connecting sleeve (44) is fixedly installed at the bottom of the inner wall of the storage barrel (4). The top of the connecting sleeve (44) is sealed. A water outlet (4401) is arranged on the side surface of the connecting sleeve (44). The lower part of the connecting sleeve (44) is communicated with the spray pipe (31). A filter plate (45) is sleeved outside the connecting sleeve (44). One end of the conveying pipe (41) extending into the storage barrel (4) is directly above the connecting sleeve (44).

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