阅读说明：本技术 复叠式两级螺杆压缩机 (Cascade two-stage screw compressor ) 是由 汤炎 惠登锋 赵建波 陈桅强 于 2019-11-22 设计创作，主要内容包括：本发明揭示了一种复叠式两级螺杆压缩机,包括第一螺杆压缩机、第二螺杆压缩机及级间齿轮箱；第一螺杆压缩机与第二螺杆压缩机通过级间齿轮箱并联复叠布置；第一螺杆压缩机包括第一机体、第一阳转子、第一阴转子及第一排气端体；第二螺杆压缩机包括第二机体、第二阳转子、第二阴转子及第二排气端体；级间齿轮箱包括齿轮箱、主动齿轮、第一从动齿轮及第二从动齿轮,第一从动齿轮与第一阳转子连接,第二从动齿轮与第二阳转子连接,主动齿轮分别与第一从动齿轮及第二从动齿轮相互啮合；所述齿轮箱内设有机械混合器,所述机械混合器能在转动的同时将齿轮箱内的油气混合。本发明提出的复叠式两级螺杆压缩机,可减小设备占地面积及长度,降低设备重量。(The invention discloses a cascade two-stage screw compressor, which comprises a first screw compressor, a second screw compressor and an interstage gear box, wherein the first screw compressor is connected with the second screw compressor through a first screw; the first screw compressor and the second screw compressor are arranged in a parallel overlapping mode through an interstage gear box; the first screw compressor comprises a first machine body, a first male rotor, a first female rotor and a first exhaust end body; the second screw compressor comprises a second machine body, a second male rotor, a second female rotor and a second exhaust end body; the interstage gear box comprises a gear box, a driving gear, a first driven gear and a second driven gear, the first driven gear is connected with the first male rotor, the second driven gear is connected with the second male rotor, and the driving gear is meshed with the first driven gear and the second driven gear respectively; a mechanical mixer is arranged in the gear box, and the mechanical mixer can mix oil and gas in the gear box while rotating. The cascade two-stage screw compressor provided by the invention can reduce the floor area and length of equipment and reduce the weight of the equipment.)

1. A cascade two-stage screw compressor is characterized in that the cascade two-stage screw compressor comprises a first screw compressor, a second screw compressor and an interstage gear box; the first screw compressor and the second screw compressor are arranged in a parallel overlapping mode through an interstage gear box;

the first screw compressor comprises a first machine body, a first male rotor, a first female rotor and a first exhaust end body; the second screw compressor comprises a second machine body, a second male rotor, a second female rotor and a second exhaust end body;

the interstage gear box comprises a gear box, a driving gear, a first driven gear and a second driven gear, wherein the driving gear is connected with the driving mechanism through a transmission shaft, the first driven gear is connected with the first male rotor, the second driven gear is connected with the second male rotor, and the driving gear is meshed with the first driven gear and the second driven gear respectively to realize that the driving mechanism drives the two-stage screw compressor simultaneously;

a mechanical mixer is arranged in the gear box, and the mechanical mixer can mix oil and gas in the gear box while rotating.

2. The cascaded two-stage screw compressor of claim 1, wherein:

the first machine body and the second machine body are integrally designed to form a compressor machine body.

3. The cascaded two-stage screw compressor of claim 1, wherein:

the first screw compressor is arranged in front of or behind the second screw compressor.

4. The cascaded two-stage screw compressor of claim 1, wherein:

the first screw compressor is arranged above or below the second screw compressor.

5. The cascaded two-stage screw compressor of claim 1, wherein:

the driving gear or/and at least one driven gear serves as the mechanical mixer.

6. The cascaded two-stage screw compressor of claim 2, wherein:

the compressor body is provided with an air inlet; one side of the first male rotor, which is close to the interstage gear box, is provided with a first rotating shaft, the first rotating shaft is connected with a first driven gear, and a bearing is arranged between the first rotating shaft and the first machine body.

7. The cascaded two-stage screw compressor of claim 2, wherein:

the first exhaust end body and the second exhaust end body in the compressor are overlapped and connected in parallel; an interstage cavity is formed between the first body and the first exhaust end body.

8. The cascaded two-stage screw compressor of claim 2, wherein:

the second exhaust end body is provided with an exhaust port; a second rotating shaft and a third rotating shaft are respectively arranged at two ends of the second male rotor, the second rotating shaft is connected with a second driven gear, and the third rotating shaft is rotatably arranged in a second exhaust end body; the second rotating shaft and the third rotating shaft are respectively provided with a bearing.

9. The cascaded two-stage screw compressor of claim 2, wherein:

the driving gear, the first driven gear and the second driven gear are arranged in an interstage cavity formed between the first exhaust end body and the second machine body.

Technical Field

The invention belongs to the technical field of compressors, relates to a screw compressor, and particularly relates to a cascade two-stage screw compressor.

Background

The working process of the two-stage compression screw compressor is that gas enters a first-stage working cavity, the gas is mixed with lubricating oil in the working cavity, compressed and pressurized and then enters an inter-stage cooling channel, the gas enters a second-stage working cavity after being subjected to inter-stage oil injection cooling, and the compressed and pressurized gas is discharged out of the compressor to complete the whole compression process.

In order to realize the process, a main machine of a two-stage screw compressor on the market at present adopts a high-pressure stage and low-pressure stage integrated design, the main machine is structurally distributed up and down, the low-pressure stage is positioned above the main machine, the high-pressure stage is positioned below the main machine, a driving gear is adopted to drive two driven gears, and the two driven gears are respectively connected with a low-pressure stage male rotor and a high-pressure stage male rotor so as to drive the two-stage rotors to run; and oil injection is added in the high-pressure stage exhaust and low-pressure stage suction channels to reduce the temperature of the intermediate gas, and the cooled compressed gas enters the second-stage rotor to be secondarily compressed and pressurized and then is discharged out of the compressor.

Traditional two-stage compression screw compressor adopts the series arrangement, and first order organism is an solitary foundry goods with the second level organism usually, sets up interface channel in the gear box, and this passageway is connected with the gear box, adopts a drive gear drive driven gear in the drive, and driving gear and driven gear are connected with low pressure level positive rotor and high pressure level positive rotor respectively, and the velocity ratio is single, and transmission efficiency is poor.

For the two-stage screw main machine, the axial length of the tandem type two-stage compression body is too long, the weight is heavy, and the occupied area range is wide; the space of the gear box is too small, and oil and gas cannot be fully mixed; the gear pair only has one driving gear and one driven gear, and the speed ratio is single; and during transmission, the low-pressure-stage male rotor needs to be driven by a driving mechanism to perform transmission, so that the transmission efficiency is low.

In view of the above, there is a need to design a new screw compressor to overcome the above-mentioned defects of the existing screw compressor.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the cascade two-stage screw compressor is provided, so that the floor area and the length of equipment can be reduced, and the weight of the equipment is reduced; meanwhile, interstage cooling can be effectively achieved, the efficiency of the compressor is improved, meanwhile, the oil-gas mixture flowing through the speed increasing gear lubricates and cools the gear, and stable operation of the gear is guaranteed.

In order to solve the technical problems, the invention adopts the following technical scheme:

a cascade two-stage screw compressor comprises a first screw compressor, a second screw compressor and an interstage gear box; the first screw compressor and the second screw compressor are arranged in a parallel overlapping mode through an interstage gear box;

the first screw compressor comprises a first machine body, a first male rotor, a first female rotor and a first exhaust end body; the second screw compressor comprises a second machine body, a second male rotor, a second female rotor and a second exhaust end body;

the interstage gear box comprises a gear box, a driving gear, a first driven gear and a second driven gear, wherein the driving gear is connected with the driving mechanism through a transmission shaft, the first driven gear is connected with the first male rotor, the second driven gear is connected with the second male rotor, and the driving gear is meshed with the first driven gear and the second driven gear respectively to realize that the driving mechanism drives the two-stage screw compressor simultaneously;

a mechanical mixer is arranged in the gear box, and the mechanical mixer can mix oil and gas in the gear box while rotating.

In one embodiment of the present invention, the first housing and the second housing are integrally designed to form a compressor housing. First helical-lobe compressor and second helical-lobe compressor share same organism, and compact structure has reduced axial length, the very big cost of having saved area and equipment.

In one embodiment of the present invention, the first screw compressor is disposed in front of or behind the second screw compressor.

In one embodiment of the present invention, the first screw compressor is disposed above or below the second screw compressor.

As an embodiment of the present invention, the driving gear or/and at least one driven gear serves as the mechanical mixer.

As an embodiment of the present invention, the compressor body is provided with an air inlet; a first rotating shaft is arranged on one side, close to the interstage gear box, of the first male rotor and connected with a first driven gear, and a bearing is arranged between the first rotating shaft and the first machine body;

the first exhaust end body and the second exhaust end body in the compressor are overlapped and connected in parallel; an interstage cavity is formed between the first body and the first exhaust end body;

the second exhaust end body is provided with an exhaust port; a second rotating shaft and a third rotating shaft are respectively arranged at two ends of the second male rotor, the second rotating shaft is connected with a second driven gear, and the third rotating shaft is rotatably arranged in a second exhaust end body; the second rotating shaft and the third rotating shaft are respectively provided with a bearing;

the driving gear, the first driven gear and the second driven gear are arranged in an interstage cavity formed between the first exhaust end body and the second machine body.

The invention has the beneficial effects that: the cascade two-stage screw compressor provided by the invention can reduce the floor area and length of equipment and reduce the weight of the equipment; meanwhile, interstage cooling can be effectively achieved, the efficiency of the compressor is improved, meanwhile, the oil-gas mixture flowing through the speed increasing gear lubricates and cools the gear, and stable operation of the gear is guaranteed. Compared with a series two-stage screw compressor, the invention has larger interstage cavity space, and the gas with certain pressure and temperature discharged from the first-stage compressor and the lubricating oil injected interstage can be fully mixed by the variable speed gear running at high speed.

In one use scenario of the present invention, the present invention has the highest efficiency by providing a variable speed gear to function as an interstage mechanical mixer, bringing the second screw compressor compression process closer to an isothermal process.

The working process of the invention is two-stage compression; the structure adopts the integrated design, and low-pressure level, high-pressure level are the overlapping parallel arrangement, and the parallelly connected integral type design has reduced the volume of whole equipment, has reduced the processing cost and the weight of compressor greatly.

Drawings

Fig. 1 is a schematic structural view of a cascade two-stage screw compressor according to an embodiment of the present invention.

Detailed Description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.

The description in this section is for several exemplary embodiments only, and the present invention is not limited only to the scope of the embodiments described. It is within the scope of the present disclosure and protection that the same or similar prior art means and some features of the embodiments may be interchanged.

The invention discloses a cascade two-stage screw compressor, and fig. 1 is a schematic structural diagram of the cascade two-stage screw compressor in an embodiment of the invention; referring to fig. 1, in an embodiment of the present invention, the cascade two-stage screw compressor includes a first screw compressor 20, a second screw compressor 21 and an interstage gear box; the first screw compressor 20 and the second screw compressor 21 are arranged in parallel and in a superposed mode through an interstage gear box, so that the whole structure of the equipment is compact, and the axial length is smaller.

The first screw compressor 20 includes a first body, a first male rotor 4, a first female rotor (of course, the number of rotors may be other types), and a first exhaust end body 7; the second screw compressor 21 includes a second block, a second male rotor 17, a second female rotor (of course, the number of rotors may be different), and a second discharge end block.

The interstage gear box comprises a gear box 22, a driving gear 13, a first driven gear 8 and a second driven gear 14, wherein the driving gear 13 is connected with a driving mechanism through a transmission shaft 12, the first driven gear 8 is connected with a first male rotor 4, the second driven gear 14 is connected with a second male rotor 17, and the driving gear 13 is meshed with the first driven gear 8 and the second driven gear 14 respectively, so that the driving mechanism can drive the two-stage screw compressor at the same time. The driving gear and the driven gear are mutually meshed, so that the driving device can drive two-stage compression simultaneously; the transmission efficiency is higher, and optional tooth speed ratio is more and it is more convenient to change.

In one embodiment of the invention, the driving gear and the driven gear are mutually meshed, so that the driving mechanism simultaneously drives the two-stage screw compressor to compress, and compared with a series two-stage screw compressor, the invention has the advantages of higher transmission efficiency, more gear ratio selection and more convenient gear replacement, and the speed ratio can be more conveniently adjusted according to different requirements.

In one embodiment, a gear box 22 is disposed between the first screw compressor 20 and the second screw compressor 21, and the gear ratio of the driving gear and each driven gear is determined according to the optimal tooth top speed of the corresponding first-stage rotor (referring to the first male rotor and the first female rotor) and the second-stage rotor (referring to the second male rotor and the second female rotor), so that the first-stage rotor and the second-stage rotor operate at the optimal tooth top speed simultaneously, and the compressor has higher efficiency. In one embodiment, the speed requirement of the first stage rotor is lower than the speed requirement of the second stage rotor, and the number of gears of the first driven gear is greater than the number of gears of the second driven gear.

In an embodiment of the present invention, the gear box 22 is composed of a gear box cover 9 and one side of the compressor body 5. The drive gear 13, the first driven gear 8, and the second driven gear 14 are disposed in the gear case 22. In one embodiment, the transmission shaft 12 is provided with a bearing 10, a bearing 15 and a sealing mechanism 11, wherein the bearing 10 and the bearing 15 are respectively disposed on two sides of the driving gear 13.

In one embodiment of the present invention, the speed-changing gears in the gear box 22 not only function as a transmission, but also function as a mechanical mixer, functioning as an interstage mechanical mixer, to enhance the oil-gas mixing effect. The gas with certain pressure and temperature discharged from the first screw compressor and the lubricating oil sprayed in the interstage are fully mixed through the variable speed gear running at high speed, the mixed oil-gas mixture enters the second screw compressor, and the compression process of the second screw compressor is closer to the isothermal process and has the highest efficiency because the specific heat of the oil is far greater than that of the air. In one embodiment, the driving gear and the driven gear simultaneously serve as the mechanical mixer, and an additional mechanical mixer is not required.

A mechanical mixer is arranged in the gear box 22, and the mechanical mixer can mix oil and gas in the gear box 22 while rotating. In one embodiment, the driving gear 13 or/and at least one driven gear serves as the mechanical mixer.

In an embodiment of the present invention, the first housing and the second housing are integrally designed to form a compressor housing 5; the machine body of the two-stage screw compressor is shared, so that the manufacturing cost is greatly saved. In an embodiment, the first screw compressor 20 is disposed in front of or behind the second screw compressor 21, or the first screw compressor 20 is disposed above or below the second screw compressor 21.

In an embodiment of the present invention, the compressor body 5 is provided with an air inlet 3; and a first rotating shaft is arranged on one side of the first male rotor 8, which is close to the interstage gear box, and is connected with the first driven gear 8, and a bearing 6 is arranged between the first rotating shaft and the first machine body. The other end of the first male rotor 4 is provided with an air suction cover 1, and a bearing 2 is arranged between the air suction cover 1 and the first male rotor 4.

The first exhaust end body 7 and the second exhaust end body in the compressor are overlapped and connected in parallel; an interstage cavity is formed between the first body and the first exhaust end body 7.

The second exhaust end body is provided with an exhaust port 18; a second rotating shaft and a third rotating shaft are respectively arranged at two ends of the second male rotor 17, the second rotating shaft is connected with the second driven gear 14, and the third rotating shaft is rotatably arranged in the second exhaust end body; the second rotating shaft and the third rotating shaft are respectively provided with bearings 16 and 19.

In one embodiment, the driving gear 13, the first driven gear 8 and the second driven gear 14 are disposed in an interstage chamber formed between the first exhaust end body 7 and the second body. In an embodiment of the present invention, the first screw compressor 20 is a low-pressure stage screw compressor, and the second screw compressor 21 is a high-pressure stage screw compressor.

In one use scenario of the present invention, the two-stage screw compressor of the present invention operates as follows: the gas enters a working cavity of the first screw compressor through a gas inlet of the first machine body, is compressed into gas with certain pressure and temperature, enters an interstage gear box, is cooled through interstage oil injection, is further mixed and atomized through a gear pair again, enters a working cavity of the second screw compressor, and is discharged through a second high-pressure stage exhaust end body after being compressed. The two-stage compression screw compressor provided by the invention adopts a first screw compressor and a second screw compressor which are in a cascade parallel connection design, the interstage realizes the driving of the driving device to the two-stage compression through a pair of gear pairs, the interstage cooling is effectively realized, simultaneously, the oil-gas mixture flowing through the gear pairs is further uniformly mixed while lubricating and cooling the gear pairs, and the efficiency of the compressor is effectively improved.

In conclusion, the cascade two-stage screw compressor provided by the invention can reduce the floor area and length of equipment and reduce the weight of the equipment; meanwhile, interstage cooling can be effectively achieved, the efficiency of the compressor is improved, meanwhile, the oil-gas mixture flowing through the speed increasing gear lubricates and cools the gear, and stable operation of the gear is guaranteed. Compared with a series two-stage screw compressor, the invention has larger interstage cavity space, and the gas with certain pressure and temperature discharged from the first-stage compressor and the lubricating oil injected interstage can be fully mixed by the variable speed gear running at high speed.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The description and applications of the invention herein are illustrative and are not intended to limit the scope of the invention to the embodiments described above. Variations and modifications of the embodiments disclosed herein are possible, and alternative and equivalent various components of the embodiments will be apparent to those skilled in the art. It will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, and with other components, materials, and parts, without departing from the spirit or essential characteristics thereof. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the invention.