A two-stage compression screw air compressor

Abstract

The application relates to the technical field of air compressors, in particular to a two-stage compression screw air compressor which comprises a compression cavity, the inside of the compression cavity is provided with two groups of compression screws arranged in upper and lower layers, the side surface of the compression cavity is provided with a driving motor, two partition plates are arranged in the compression cavity at intervals, first through holes are arranged on the two partition plates, a bent plate is fixedly installed on the lower partition plate, and a second through hole penetrating through the first through hole on the lower partition plate is arranged on the bent plate; an installation gap is formed between the bent plate and the lower partition plate, a flow-through gap for the downward flow of primary compressed air is formed between the bent plate and the upper partition plate, an oil injection pipe is arranged at the installation gap, and a heat dissipation structure is arranged on the side surface of the oil injection pipe. In the application, the temperature difference between the oil injected into the compression cavity and the air in the compression cavity can be increased, so that the compression cavity can be cooled more quickly.

Description

Technical Field

[0001] The present invention relates to the technical field of air compressors, and in particular 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 rotation of a pair of intermeshing helical rotors (screws). The compression process of a two-stage screw air compressor is as follows: natural air passes through the air filter and enters the first stage of compression. In the compression chamber, it mixes with a small amount of lubricating oil and is compressed to the interstage pressure. The compressed gas enters the cooling channel and comes into contact with a large amount of oil mist (lubricating oil), which greatly reduces its temperature. The cooled compressed gas enters the second stage of the rotor for secondary compression, and is compressed to the final exhaust pressure.

[0003] Usually, after the lubricating oil and the air complete the 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 that transports the lubricating oil. After the cooling, the lubricating oil will absorb heat after being pumped into the delivery pipeline (especially a section of the pipeline close to the compression chamber, which will generate heat exchange with the compression chamber during use), which will reduce the cooling effect of the lubricating oil when it is sprayed into the cooling channel. Summary of the Invention

[0004] Technical problems solved

[0005] In response to the above-mentioned shortcomings of the prior art, the present invention provides a two-stage compression screw air compressor, which can effectively solve the problem that the prior art usually collects the lubricating oil and air for recycling after completing the heat exchange, but the 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 lubricating oil is cooled, it absorbs heat after being pumped into the delivery pipeline, which will reduce the cooling effect of the lubricating oil when it is sprayed into the cooling channel.

[0006] Technical Solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] The present invention provides a two-stage compression screw air compressor, comprising a compression chamber, wherein two sets of compression screws are disposed in the compression chamber, and a drive motor for driving the compression screws is disposed on the side of the compression chamber. Two partitions are disposed in the compression chamber, each of which is provided with a first through hole. A bent plate is fixedly mounted on the lower partition, and the bent plate is provided with a second through hole that is in communication with the first through hole on the lower partition.

[0009] An installation gap is formed between the bent plate and the lower partition, and a circulation gap for primary compressed air to flow downward is formed between the bent plate and the upper partition. An oil spray pipe for spraying cooling oil into the circulation gap is provided at the installation gap, and a heat dissipation structure is provided on the side of the oil spray pipe.

[0010] Furthermore, a heat dissipation frame is fixedly installed in the installation gap, the heat dissipation frame is fixedly installed inside the installation gap, an oil injection part connected to the oil injection pipe is provided inside the heat dissipation frame, an oil injection through hole connected to the inside of the heat dissipation frame is provided on the bending plate, the bottom of the heat dissipation frame is sealed, and a circulation outlet is provided on one side of the heat dissipation frame.

[0011] Furthermore, a limit block is provided on the bending plate, and the limit block is tilted downward toward one side of the oil injection through hole, and the limit block is used to guide the liquefied oil to flow downward.

[0012] Furthermore, two heat dissipation frames are arranged at intervals, the lower parts of the two heat dissipation frames are connected to each other, a heat dissipation groove is formed between the two heat dissipation frames, two groups of fuel injection pipes are provided, the two groups of fuel injection pipes extend into the interior of the two heat dissipation frames respectively, the two groups of fuel injection pipes are arranged at intervals up and down, and the fuel injection pipes are made of copper pipes.

[0013] Furthermore, the heat dissipation structure includes a shell and two heat dissipation fans fixedly installed on the side of the shell away from the oil injection pipe. The two heat dissipation fans are arranged at intervals, and multiple spray pipes are arranged between the two heat dissipation fans. The spray pipes are used to spray atomized water on the sides of the heat dissipation fans respectively.

[0014] Furthermore, it also includes an air storage tank, which is connected to the air outlet below the compression chamber through an exhaust pipe. The air storage tank is used to store compressed gas. A storage barrel is fixedly installed on the side of the air storage tank, and a delivery pipe is installed above the storage barrel. The other end of the delivery pipe is respectively connected to multiple spray pipes, and the storage barrel is used to supply spray water to the spray pipe.

[0015] Furthermore, a blowout pipe is installed at the bottom of the gas tank, and the blowout pipe is used to release condensed water in the air inside the gas tank. The other end of the blowout pipe is connected to the bottom of the storage barrel, and the blowout pipe is used to transport the condensed water inside the gas tank to the inside of the storage barrel. An electromagnetic control valve for controlling the switch of the blowout pipe is provided on the blowout pipe, and a pressure relief valve and a water inlet are provided above the storage barrel.

[0016] Furthermore, a connecting sleeve is fixedly installed on the bottom of the inner wall of the storage barrel, the top of the connecting sleeve is sealed, a water outlet is provided on the side of the connecting sleeve, the bottom of the connecting sleeve is connected to the spray pipe, the outer side of the connecting sleeve is provided with a filter plate, and the end of the delivery pipe extending into the interior of the storage barrel is located directly above the connecting sleeve.

[0017] Beneficial effects

[0018] Compared with the known public technologies, the technical solution provided by the present invention has the following beneficial effects:

[0019] 1. In the present invention, a bent plate is fixedly installed between two partitions, so that a flow gap is formed between the bent plate and the upper partition for the gas at the tail of the first-stage compression space to enter the second-stage compression space, and the gas at the tail of the first-stage compression space flows from the flow gap to the starting end of the second-stage compression space, which not only allows the lubricating oil to cool the first-stage compressed air to a certain extent, but also can conveniently lubricate the second-stage compression screw; the heat dissipation structure cools the oil before the oil enters the interior of the compression cavity, which can increase the temperature difference between the oil sprayed into the compression cavity and the air inside the compression cavity, so that the interior of the compression cavity can be cooled more quickly, and the lubricating oil and the compression cavity can be cooled more accurately and efficiently, which is more energy-saving and environmentally friendly.

[0020] 2. In the present invention, the heat dissipation frame is fixedly installed inside the installation gap, and the interior of the heat dissipation frame is connected with the interior of the circulation gap. During use, when the oil spray pipe sprays atomized lubricating oil into the circulation gap, excess lubricating oil can flow into the interior of the heat dissipation frame, avoiding lubricating oil retention in 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 reduce the surface temperature of the compression cavity.

[0021] 3、The application, through the fixed installation storage bucket on the side of the gas tank, the storage bucket supplies water to multiple spray pipes through the conveying pipe, through the setting of the spray pipe at the bottom of the gas tank, and the other end of the spray pipe is communicated with the bottom of the storage bucket, when the liquefied water at the bottom of the gas tank needs to be released, the compressed gas can be extruded to form water at the bottom of the gas tank into the inside of the storage bucket by opening the electromagnetic control valve, the liquefied water in the gas tank can be fully utilized, in addition, since the storage bucket is communicated with the gas tank through the spray pipe, when the spray pipe needs to spray water for cooling, the gas in the gas tank can enter the inside of the storage bucket by temporarily opening the electromagnetic control valve, the gas pressure strength in the inside of the storage bucket is increased, the water in the inside of the storage bucket can be sprayed along the conveying pipe and the spray pipe, and additional extraction device does not need to be added. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0024] Figure 2 It is another angle schematic diagram of the structure of the present application;

[0025] Figure 3 It is a schematic diagram of the overall structure of the present application without the driving motor;

[0026] Figure 4 It is a sectional view of the compression cavity of the present application;

[0027] Figure 5 It is a schematic diagram of the gas flow in the compression cavity of the present application;

[0028] Figure 6 It is a schematic diagram of the overall structure of the bending plate of the present application;

[0029] Figure 7 It is a schematic diagram of the overall structure of the storage bucket of the present application;

[0030] Figure 8 It is a schematic diagram of the internal structure of the heat dissipation structure of the present application;

[0031] Figure 9 It is a schematic diagram of the internal structure of the storage bucket of the present application.

[0032] The numbers in the drawings respectively represent:

[0033] 1. Compression chamber; 101. Air inlet; 102. Air outlet; 11. Exhaust pipe; 12. Partition plate; 1201. First through hole; 13. Bent plate; 1301. Second through hole; 1302. Installation gap; 1303. Oil injection through hole; 131. Stop block; 14. Oil injection pipe; 141. Oil injection element; 15. Heat dissipation frame; 1501. Heat dissipation slot; 151. Circulation outlet;

[0034] 2. Drive motor; 3. Gas storage tank; 31. Discharge pipe; 311. Solenoid control valve;

[0035] 4. Storage barrel; 41. Delivery pipe; 42. Pressure relief valve; 43. Water inlet; 44. Connecting sleeve; 4401. Water outlet; 45. Filter plate 45; 5. Heat dissipation structure; 51. Cooling fan; 52. Spray pipe. DETAILED DESCRIPTION

[0036] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] The present invention will be further described below with reference to the embodiments.

[0038] 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 it enters the compression chamber 1 by setting a heat dissipation structure 5, thereby increasing the temperature difference between the oil sprayed into the compression chamber 1 and the air inside the compression chamber 1.

[0039] Example: A two-stage compression screw air compressor, such as Figure 1 - Figure 4 As shown, it includes a compression chamber 1, an air inlet 101 is provided above the compression chamber 1, two sets of upper and lower compression screws are provided inside the compression chamber 1 (forming a primary compression space and a secondary compression space respectively), a drive motor 2 for driving the compression screws is provided on the side of the compression chamber 1, two partitions 12 are provided inside the compression chamber 1, and both partitions 12 are provided with a first through hole 1201, a bent plate 13 is fixedly installed on the lower partition 12, and the bent plate 13 is provided with a second through hole 1301 that penetrates the first through hole 1201 on the lower partition 12;

[0040] An installation gap 1302 is formed between the bending plate 13 and the lower partition 12, and a circulation gap for the primary compressed air to flow downward is formed between the bending plate 13 and the upper partition 12. An oil spray pipe 14 for spraying cooling oil into the circulation gap is provided at the installation gap 1302, and a heat dissipation structure 5 is provided on the side of the oil spray pipe 14.

[0041] In the present invention, a bent plate 13 is fixedly installed between two partitions 12, so that a circulation gap is formed between the bent plate 13 and the upper partition 12 for the gas at the tail of the first-level compression space to enter the second-level compression space, so that the gas at the tail of the first-level compression space flows from the circulation gap to the starting end of the second-level compression space, so that the second-level compression is conveniently performed. At the same time, in the process of the gas at the tail of the first-level compression space flowing in the circulation gap, lubricating oil is sprayed at the installation gap 1302, which not only allows the lubricating oil to cool the first-level compressed air to a certain extent, but also can conveniently lubricate the second-level compression screw; the heat dissipation structure 5 cools the oil before the oil enters the interior of the compression chamber 1, which can increase the temperature difference between the oil sprayed into the compression chamber 1 and the air inside the compression chamber 1, so that the interior of the compression chamber 1 can be cooled more quickly.

[0042] It should be noted that a lubricating oil return port is provided at the bottom of the compression chamber 1, and excess lubricating oil will be discharged from the compression chamber 1 from the lubricating oil return port. This structure is a common lubricating oil discharge method in the prior art and will not be repeated in this application document.

[0043] Furthermore, if Figure 5 and Figure 6 As shown, a heat dissipation frame 15 is fixedly installed in the installation gap 1302, and the heat dissipation frame 15 is fixedly installed inside the installation gap 1302. An oil injection part 141 connected to the oil injection pipe 14 is provided inside the heat dissipation frame 15, and an oil injection through hole 1303 connected to the inside of the heat dissipation frame 15 is provided on the bending plate 13. The bottom of the heat dissipation frame 15 is sealed, and a circulation outlet 151 is provided on one side of the heat dissipation frame 15. The circulation outlet 151 can be used to release excess lubricating oil inside the heat dissipation frame 15; a limiting block 131 is provided on the bending plate 13, and the limiting block 131 is tilted downward toward one side of the oil injection through hole 1303, and the limiting block 131 is used to guide the liquefied oil to flow downward.

[0044] Wherein, by fixing the heat dissipation frame 15 inside the installation gap 1302, the inside of the heat dissipation frame 15 is communicated with the inside of the flow gap, and when the oil injection pipe 14 sprays atomized lubricating oil into the inside of the flow gap during use, the excess lubricating oil can flow into the inside of the heat dissipation frame 15, avoiding the retention of lubricating oil in the inside of the compression cavity 1 (for example, the lubricating oil overflowing at the end of the oil injection pipe 14 will drip downward into the inside of the heat dissipation frame 15 under the action of gravity), and the heat dissipation structure 5 can cool the outer surface of the heat dissipation frame 15 while cooling the oil injection pipe 14, so that the surface temperature of the compression cavity 1 can be lowered more quickly.

[0045] Further, as shown in Figure 6 The heat dissipation frame 15 is arranged in two, the lower parts of the two heat dissipation frames 15 are communicated with each other, and the heat dissipation grooves 1501 are formed between the two heat dissipation frames 15. The oil injection pipe 14 is provided in two groups, and the two groups of oil injection pipes 14 respectively extend into the inside of the two heat dissipation frames 15. The two groups of oil injection pipes 14 are arranged in an upper and lower interval, and the oil injection pipe 14 is made of a copper pipe.

[0046] Wherein, by arranging two heat dissipation frames 15 at intervals, the gap between the two heat dissipation frames 15 can be used for heat dissipation airflow, which can increase the heat dissipation area of the outer surface of the heat dissipation frame 15 and cool the heat dissipation frame 15 and the gas inside the heat dissipation frame 15 more quickly. By using a copper pipe for the oil injection pipe 14, the lubricating oil inside the oil injection pipe 14 can be cooled down quickly, which is convenient for the lubricating oil to cool the inside of the compression cavity 1.

[0047] Further, as shown in Figure 8 The heat dissipation structure 5 includes an outer shell and two heat dissipation fans 51 fixedly installed on the side of the outer shell away from the oil injection pipe 14. The two heat dissipation fans 51 are arranged at intervals, and 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 to the side of the heat dissipation fan 51.

[0048] Wherein, by spraying atomized water in the middle of the two heat dissipation fans 51, the atomized water can be in contact with the airflow, the oil injection pipe 14 and the heat dissipation frame 15, which can further increase the heat dissipation effect of the heat dissipation frame 15 and the oil injection pipe 14 (since the lubricating oil inside the oil injection pipe 14 is recycled, after being used for a period of time, the outer wall of the oil injection pipe 14 will be heated to a certain temperature). The atomized water will absorb the high temperature near the oil injection pipe 14 and the heat dissipation frame 15 during evaporation, and the lubricating oil inside the oil injection pipe 14 will be cooled down more quickly.

[0049] Further, as shown in Figure 7As shown, it also includes an air storage tank 3, which is connected to the air outlet 102 below the compression chamber 1 through an exhaust pipe 11. The air storage tank 3 is used to store compressed gas. A storage barrel 4 is fixedly installed on the side of the air storage tank 3. A delivery pipe 41 is installed above the storage barrel 4. The other end of the delivery pipe 41 is connected to a plurality of spray pipes 52 respectively. The storage barrel 4 is used to supply spray water to the spray pipe 52; the bottom of the air storage tank 3 is connected to a spray pipe 31, and the spray pipe 31 is used to In order to release the condensed water in the air inside the gas storage tank 3, the other end of the ejection pipe 31 is connected to the bottom of the storage barrel 4. The ejection pipe 31 is used to transport the condensed water inside the gas storage tank 3 to the inside of the storage barrel 4. The ejection pipe 31 is provided with an electromagnetic control valve 311 for controlling the switch of the ejection 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 adding water to the storage barrel 4 when the water level inside the storage barrel 4 drops) are provided above the storage barrel 4.

[0050] Among them, by fixing the storage barrel 4 on the side of the gas tank 3, the storage barrel 4 supplies water to multiple spray pipes 52 through the delivery pipe 41. By arranging the ejection pipe 31 at the bottom of the gas tank 3 and connecting the other end of the ejection pipe 31 to the bottom of the storage barrel 4, when it is necessary to release the liquefied water at the bottom of the gas tank 3, the electromagnetic control valve 311 can be opened to allow the compressed gas to squeeze the water formed at the bottom of the gas tank 3 into the storage barrel 4, so that the liquefied water inside the gas tank 3 can be fully utilized. In addition, since the storage barrel 4 is connected to the gas tank 3 through the ejection pipe 31, when the spray pipe 52 needs to spray water for cooling, the electromagnetic control valve 311 can be briefly opened to allow the gas inside the gas tank 3 to enter the storage barrel 4, thereby increasing the air pressure strength inside the storage barrel 4, so that the water inside the storage barrel 4 can be sprayed along the delivery pipe 41 and the spray pipe 52, without the need for additional extraction devices.

[0051] Furthermore, if Figure 9 As shown, a connecting sleeve 44 is fixedly installed on the bottom of the inner wall of the storage barrel 4, the top of the connecting sleeve 44 is sealed, and a water outlet 4401 is provided on the side of the connecting sleeve 44. The bottom of the connecting sleeve 44 is connected to the spray pipe 31, and a filter plate 45 is provided on the outer side of the connecting sleeve 44. The end of the delivery pipe 41 extending into the interior of the storage barrel 4 is located directly above the connecting sleeve 44.

[0052] Among them, by arranging a connecting sleeve 44 inside the storage barrel 4, the water at the ejection pipe 31 can be conveniently introduced into the bottom of the storage barrel 4. By arranging a filter plate 45 on the outside of the connecting sleeve 44, the water flowing out of the ejection pipe 31 can be filtered to prevent particulate matter in the water from clogging the spray pipe 52 during use.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to 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 chamber (1), wherein two sets of compression screws are arranged in the compression chamber (1), a driving motor (2) for driving the compression screws is arranged on the side of the compression chamber (1), and two upper and lower partitions (12) are arranged in the compression chamber (1), and both partitions (12) are provided with a first through hole (1201), characterized in that: A bent plate (13) is fixedly mounted on the lower partition (12), and the bent plate (13) is provided with a second through hole (1301) that is in communication with the first through hole (1201) on the lower partition (12); An installation gap (1302) is formed between the bending plate (13) and the lower partition (12), and a circulation gap for primary compressed air to flow downward is formed between the bending plate (13) and the upper partition (12). An oil spray pipe (14) for spraying cooling oil into the circulation gap is provided at the installation gap (1302), and a heat dissipation structure (5) is provided on the side of the oil spray pipe (14); A heat dissipation frame (15) is fixedly installed in the installation gap (1302), the heat dissipation frame (15) is fixedly installed in the installation gap (1302), an oil spraying member (141) communicating with the oil spraying pipe (14) is provided in the interior of the heat dissipation frame (15), an oil spraying through hole (1303) communicating with the interior of the heat dissipation frame (15) is provided on the bending plate (13), the bottom of the heat dissipation frame (15) is sealed, and a circulation outlet (151) is provided on one side of the heat dissipation frame (15); A limit block (131) is provided on the bending plate (13), and the limit block (131) is tilted downwardly toward one side of the oil injection through hole (1303), and the limit block (131) is used to guide the liquefied oil to flow downwardly; Two heat dissipation frames (15) are arranged at intervals, the lower parts of the two heat dissipation frames (15) are interconnected, and a heat dissipation groove (1501) is formed between the two heat dissipation frames (15). Two groups of oil injection pipes (14) are provided, and the two groups of oil injection pipes (14) extend into the interior of the two heat dissipation frames (15) respectively. The two groups of oil injection pipes (14) are arranged at intervals up and down, and the oil injection pipes (14) are made of copper pipes.

2. A two-stage compression screw air compressor according to claim 1, characterized in that: The heat dissipation structure (5) comprises a housing and two heat dissipation fans (51) fixedly mounted on a side of the housing away from the oil spray pipe (14). The two heat dissipation fans (51) are arranged at intervals, and 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 toward the sides of the heat dissipation fans (51).

3. A two-stage compression screw air compressor according to claim 2, characterized in that: The invention also includes an air storage tank (3), which is connected to the air outlet (102) below the compression chamber (1) through an exhaust pipe (11). The air storage tank (3) is used to store compressed gas. A storage barrel (4) is fixedly installed on the side of the air storage tank (3). A delivery pipe (41) is installed above the storage barrel (4). The other end of the delivery pipe (41) is respectively connected to a plurality of spray pipes (52). The storage barrel (4) is used to supply spray water to the spray pipe (52).

4. A two-stage compression screw air compressor according to claim 3, characterized in that: The bottom of the gas storage tank (3) is connected to a discharge pipe (31) installed thereon. The discharge pipe (31) is used to release condensed water in the air inside the gas storage tank (3). The other end of the discharge pipe (31) is connected to the bottom of the storage barrel (4). The discharge pipe (31) is used to transport the condensed water inside the gas storage tank (3) to the inside of the storage barrel (4). The discharge pipe (31) is provided with an electromagnetic control valve (311) for controlling the opening and closing of the discharge pipe (31). A pressure relief valve (42) and a water filling port (43) are provided above the storage barrel (4).

5. The two-stage compression screw air compressor according to claim 4, characterized in that: A connecting sleeve (44) is fixedly mounted on 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 provided on the side of the connecting sleeve (44), the bottom of the connecting sleeve (44) is communicated with the ejection pipe (31), a filter plate (45) is provided on the outer side of the connecting sleeve (44), and one end of the delivery pipe (41) extending into the interior of the storage barrel (4) is located directly above the connecting sleeve (44).

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