A large displacement rotary compressor

Abstract

The present invention provides a large-displacement positive displacement rotary compressor, including a shell, wherein a center wheel and a single or multiple spiral groove rotors are arranged in the shell; circular tooth plates are formed on the center wheel, and spiral grooves are formed on the spiral groove rotor. There is a certain gap between the circular tooth plates and the spiral grooves, and they are meshed and connected with each other, and cooperate with the shell to complete the suction, compression and exhaust processes; the gap between the circular tooth plates and the spiral grooves is sealed and cooled by a liquid spray. The combination of the center wheel and the single or multiple spiral groove rotors of the large-displacement positive displacement rotary compressor of the present invention makes the volume of the spiral groove rotor very small, making the processing of the spiral groove rotor very easy, thereby realizing the manufacture of the large-displacement positive displacement rotary compressor, and the circular tooth plates on the center wheel and the spiral grooves on the spiral groove rotor do not contact and are cooled and sealed by a liquid spray, so that the positive displacement rotary compressor has higher efficiency, longer service life and smoother operation.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a large-displacement rotary compressor. Background Art

[0002] Compressors are machines used to compress gas to increase gas pressure. They are widely used in chemical, steel, petroleum, food, pharmaceutical, mineral processing, coal, water treatment, automobile and shipbuilding industries. They are large-scale energy-consuming equipment. Even a slight improvement in the efficiency of compressor products can bring huge energy savings. This shows that improving the efficiency of compressor products is of great significance to energy conservation.

[0003] Compressors can be divided into positive displacement compressors and dynamic (speed) compressors according to different working principles. Positive displacement compressors directly compress the gas in a variable volume, reducing the volume of the gas and increasing the pressure. There are mainly piston type, vane type, scroll type, screw type and other types.

[0004] At present, large-displacement air compressors are mainly centrifugal air compressors. Since centrifugal air compressors are speed-type compressors and multi-stage dry compression, the compressors suffer serious energy loss during operation. Under very reasonable design conditions, their variable efficiency is only about 70%, and for high-pressure and small-flow compressors, it is only about 60%; if the operating conditions deviate from the design conditions, their efficiency will be even lower, and the industrial gas consumption is often not fixed, so the efficiency of centrifugal air compressors in actual use is generally very low. Centrifugal air compressors are generally used in occasions with large gas consumption. Some large chemical plants and steel plants can use tens of thousands of cubic meters per minute, so their low efficiency is a waste of power consumption in a large sense. Summary of the invention

[0005] In view of the above technical problems, the object of the present invention is to provide a large-displacement rotary compressor, the entire compressor runs smoothly, has little vibration, long service life and high efficiency.

[0006] To achieve the above object, the present invention provides a large displacement rotary compressor, comprising a housing, wherein a central wheel and a single or multiple spiral groove rotors are arranged in the housing;

[0007] The central wheel is formed with circular tooth pieces, the spiral groove rotor is formed with spiral grooves, the circular tooth pieces and the spiral grooves are meshed with each other with a certain gap, and cooperate with the shell to complete the suction, compression and exhaust processes;

[0008] The gap between the circular tooth piece and the spiral groove is sealed and cooled by liquid spray.

[0009] Optionally, the spiral groove rotor is a cylindrical spiral groove rotor.

[0010] Optionally, the spiral groove rotor is a frustoconical arc-shaped spiral groove rotor.

[0011] Preferably, the circular gear pieces are independently mounted on the center wheel.

[0012] Preferably, the center wheel is driven to rotate by a main shaft, and the main shaft is connected to the motor or the steam turbine through a coupling.

[0013] Furthermore, the spiral groove rotor is driven by a gear transmission mechanism to rotate independently;

[0014] The gear transmission mechanism includes a first bevel gear arranged on the main shaft, a second bevel gear meshing with the first bevel gear, a first spur gear coaxially arranged with the second bevel gear, a second spur gear meshing with the first spur gear, and a third spur gear meshing with the second spur gear. The spiral groove rotor is driven and rotated by the third spur gear.

[0015] Optionally, the shell is respectively provided with an air inlet, an exhaust port, a liquid injection port, a liquid discharge port and a gear maintenance window.

[0016] From the above, the large displacement rotary compressor of the present invention has at least the following effects:

[0017] 1. High efficiency, the efficiency is as high as over 90%, the energy-saving effect is very significant, saving a lot of electricity, the efficiency is stable, and there is no obvious fluctuation with the air intake and gas consumption.

[0018] 2. Long service life. Through high-precision gear transmission, the circular gear pieces and spiral grooves do not contact and there is liquid spray. The entire compressor runs smoothly, with little vibration and long service life.

[0019] 3. The single-stage pressure ratio is high, which can reach 1.6MPA. The centrifugal compressor under the same pressure needs 3 or more stages of compression to complete.

[0020] 4. Small size. Due to the reasonable host structure and single-stage compression, the entire compressor has a simple structure, very small size, and occupies little space.

[0021] 5. Since each center wheel has independent circular gears and there is a special maintenance window on the casing, the maintenance of the main engine becomes very simple.

[0022] 6. The volume flow rate range is wide, which can achieve a volume flow rate range from tens of cubic meters to thousands of cubic meters per minute, suitable for gas use in various industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1A schematic diagram of the appearance of a large displacement rotary compressor according to a preferred embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of the internal structure of a large displacement rotary compressor with the outer shell removed according to a preferred embodiment of the present invention;

[0025] Figure 3 A central cross-sectional view of a large displacement positive displacement rotary compressor according to a preferred embodiment of the present invention;

[0026] Figure 4 A schematic diagram of a multi-spiral groove rotor of a large displacement positive displacement rotary compressor according to a preferred embodiment of the present invention;

[0027] Figure 5 A schematic diagram of a cylindrical spiral groove rotor of a large displacement positive displacement rotary compressor according to a preferred embodiment of the present invention;

[0028] Figure 6 Schematic diagram of a truncated cone arc spiral groove rotor of a large displacement rotary compressor according to a preferred embodiment of the present invention.

[0029] In the figure, 1-main shaft, 2-first bevel gear, 3-second bevel gear, 4-first spur gear, 5-second spur gear, 6-third spur gear, 7-center wheel, 8-spiral groove rotor, 8-1-cylindrical spiral groove rotor, 8-2-conical arc spiral groove rotor, 9-housing, 9-1-air inlet, 9-2-exhaust port, 9-3-liquid injection port, 10-circular gear. DETAILED DESCRIPTION

[0030] See below Figures 1 to 6 The large displacement positive displacement rotary compressor of the present invention will be described in detail.

[0031] The large displacement rotary compressor of the present invention includes a housing 9, on which are respectively provided an air inlet 9-1, an exhaust port 9-2, a liquid injection port 9-3, a liquid discharge port and a gear maintenance window. In addition, a center wheel 7 and a single or multiple spiral groove rotors 8 are provided in the housing 9, and 3-n circular gears 10 are formed on the center wheel 7, and the circular gears 10 are independently mounted on the center wheel 7 for easy disassembly and maintenance. 2-n spiral grooves are formed on the spiral groove rotor 8, and the spiral grooves and the circular gears 10 on the center wheel 7 are meshed with each other and cooperate with the housing 9 to complete the suction, compression and exhaust processes. Each circular gear 10 meshing with the spiral groove is equivalent to a cylinder. When the circular gear 10 meshes with the spiral groove, there is a certain clearance fit and there is liquid injection sealing and cooling.

[0032] In addition, if Figure 5 and Figure 6As shown, the spiral groove rotor 8 of the present invention has two forms, one is a cylindrical spiral groove rotor 8-1, and the other is a truncated cone arc spiral groove rotor 8-2. The cylindrical spiral groove rotor 8-1 or the truncated cone arc spiral groove rotor 8-2 has 2-n spiral grooves, and meshes with the circular tooth pieces 10 on the center wheel 7, and the cylindrical spiral groove rotor 8-1 or the truncated cone arc spiral groove rotor 8-2 rotates independently through the change of direction and speed of the first bevel gear 2, the second bevel gear 3, the first spur gear 4, the second spur gear 5, and the third spur gear 6.

[0033] The center wheel 7 of the present invention is driven to rotate by the main shaft 1, and the main shaft 1 is connected to the motor or the steam turbine through a coupling. The spiral groove rotor is driven to rotate independently by a gear transmission mechanism, and the gear transmission mechanism includes a first bevel gear 2 arranged on the main shaft 1, a second bevel gear 3 meshing with the first bevel gear 2, a first spur gear 4 coaxially arranged with the second bevel gear 3, a second spur gear 5 meshing with the first spur gear 4, and a third spur gear 6 meshing with the second spur gear 5. The spiral groove rotor is driven and rotated by the third spur gear 6.

[0034] In the present invention, during operation, the motor or steam turbine is connected to the main shaft 1 through a coupling to drive the center wheel 7 to rotate, the main shaft 1 can make the center wheel axis also make the spiral groove rotor axis, and the spiral groove rotor 8 rotates independently through the direction and speed change of the first bevel gear 2, the second bevel gear 3, the first spur gear 4, the second spur gear 5, and the third spur gear 6. Since the center wheel 7 and the spiral groove rotor 8 operate independently, the circular gear piece 10 does not contact the spiral groove and does not generate friction.

[0035] Due to the combination of the center wheel 7 and the single or multiple spiral groove rotors 8 of the present invention, the volume of the spiral groove rotor 8 is very small, making the processing of the spiral groove rotor 8 very easy, thereby realizing the manufacture of a large-displacement rotary compressor.

[0036] Conventional positive displacement rotary compressors, including vane, scroll and screw compressors, have a maximum volume flow rate of no more than 100m3 due to the limitations of their host structure and processing. 3 / min, the large-displacement positive displacement rotary compressor of the present invention has a unique main engine structure, which makes it very easy to manufacture the large-displacement gas compressor. The circular gears and spiral grooves do not contact each other and have spray cooling and sealing, which makes the positive displacement rotary compressor more efficient and has a longer service life.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A large displacement rotary compressor, comprising a housing (9), characterized in that: A central wheel (7) and a plurality of spiral groove rotors (8) are provided in the housing (9); The central wheel (7) is formed with a circular tooth piece (10), the spiral groove rotor (8) is formed with a spiral groove, a gap is provided between the circular tooth piece (10) and the spiral groove, the circular tooth piece (10) and the spiral groove are meshed and connected with each other, and cooperate with the housing (9) to complete the suction, compression and exhaust processes; The gap between the circular tooth piece (10) and the spiral groove is sealed and cooled by spraying liquid; The spiral groove rotor (8) is a truncated cone arc spiral groove rotor (8-2); the circular tooth piece (10) is independently mounted on the center wheel (7); The central wheel (7) is driven to rotate by the main shaft (1), and the main shaft (1) is connected to the motor or the steam turbine through a coupling; the spiral groove rotor (8) is driven to rotate independently by the gear transmission mechanism; The gear transmission mechanism comprises a first bevel gear (2) arranged on the main shaft (1), a second bevel gear (3) meshingly connected to the first bevel gear (2), a first spur gear (4) coaxially arranged with the second bevel gear (3), a second spur gear (5) meshingly connected to the first spur gear (4), and a third spur gear (6) meshingly connected to the second spur gear (5), wherein the spiral groove rotor (8) is driven and rotated by the third spur gear (6).

2. The large displacement rotary compressor according to claim 1, characterized in that: The housing (9) is respectively provided with an air inlet (9-1), an air outlet (9-2), a liquid injection port (9-3), a liquid discharge port and a gear repair window.

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