A multi-stage large flow compressor

Abstract

The present invention relates to a multi-stage large flow compressor, which is provided with N independently sealed chambers in a shell, the exhaust port of each chamber is connected to the air inlet of the next stage, and the exhaust of each stage enters the next stage after being cooled; at least one star wheel shaft and at least one screw are provided in each chamber, the axis of the star wheel shaft is perpendicular to the axis of the screw; a star wheel is provided on the star wheel shaft; a main shaft is provided on the shell, and the main shaft drives the screw and the star wheel of each chamber to rotate independently and synchronously at a fixed speed ratio through a transmission device, and the spiral groove clearance of the star wheel and the screw is matched; a liquid injection hole is provided on the shell of each chamber, and the liquid sprayed from the liquid injection hole seals and cools the matching part of the star wheel and the screw, so as to realize the suction, compression and exhaust process of the corresponding chamber. The compressor adopts a combined structure of a star wheel and a screw, and performs multi-stage compression, which not only reduces the volume of the compressor, but also increases the volume flow, and improves the compression efficiency.

Description

Technical Field

[0001] The invention relates to a multi-stage large-flow compressor, belonging to the technical field of positive displacement rotary compressors. Background Art

[0002] A compressor is a driven fluid machine that boosts low-pressure gas to high-pressure gas. It is widely used in various fields of industry. With the continuous development of the compressor industry, customers have higher and higher requirements for the efficiency of compressors. Existing compressors are usually one-stage transmission, and the gas is discharged after one compression. It is difficult for the efficiency of the compressor to reach the ideal level.

[0003] The existing public document publication number CN211082252U, the patent name is "A utility model patent for a multi-stage transmission structure for a compressor", which discloses a compressor with a multi-stage transmission structure, and the technical problem it solves is to reduce the volume of the compressor. However, the compressor has three rotors, and the rotors on both sides are meshed with the middle rotor for transmission. During the meshing process, there will be wear and tear, which will affect the service life, and also affect the compression rate of the air compressor. Summary of the invention

[0004] The technical problem to be solved by the invention is to provide a multi-stage large flow compressor, which adopts a combined structure of a star wheel and a screw and performs a multi-stage compression method, which not only reduces the size of the compressor, increases the volume flow, but also improves the compression efficiency.

[0005] In order to solve the above problems, the specific technical solutions created by the present invention are as follows: a multi-stage large-flow compressor, N independently sealed chambers are arranged in the shell, the exhaust port of each stage of the chamber is connected to the air inlet of the next stage, and the exhaust of each stage enters the next stage after cooling; at least one star wheel shaft and at least one screw are arranged in each chamber, and the axis of the star wheel shaft is perpendicular to the axis of the screw; a star wheel is arranged on the star wheel shaft; a main shaft is arranged on the shell, and the main shaft drives the screw and the star wheel of each chamber to rotate independently and synchronously at a fixed speed ratio through a transmission device, and the spiral groove clearance of the star wheel and the screw is matched; injection holes are respectively provided on the shell of each chamber, and the liquid sprayed from the injection holes seals and cools the matching point between the star wheel and the screw, thereby realizing the suction, compression and exhaust process of the corresponding chamber.

[0006] The compressor is a two-stage compression, with two chambers in the shell, a star wheel shaft running through the two chambers, two star wheels coaxially connected on the star wheel shaft, and respectively located in two different chambers; each chamber is provided with a screw perpendicular to the star wheel shaft.

[0007] The transmission device structure is as follows: a main shaft gear is coaxially arranged on the main shaft, and the main shaft gear circumference is simultaneously meshed with two screw end gears I, and each screw end gear I is coaxially connected to one end of the screw of the corresponding chamber to complete the rotation of the screw; a screw end gear II is coaxially arranged at the other end of the screw in one of the chambers, and a transition shaft parallel to the screw is arranged in the chamber, a transition gear II is arranged at one end of the transition shaft, and the transition gear II is meshed with the screw end gear II through the transition gear I, a bevel gear is arranged at the other end of the transition shaft, and a star wheel end gear is arranged at the end of the star wheel shaft, and the star wheel end gear is meshed with the bevel gear.

[0008] The compressor is a two-stage compression system with two chambers in the shell. A star wheel shaft runs through the two chambers. Two star wheels are coaxially connected on the star wheel shaft and are located in two different chambers respectively. Two screws perpendicular to the star wheel shaft are arranged in each chamber, and the star wheel in each chamber is matched with the spiral groove clearance of the two screws at the same time.

[0009] The transmission device structure is as follows: a first screw and a second screw are provided in a first chamber, and a third screw and a fourth screw are provided in a second chamber; a main shaft gear is coaxially arranged on the main shaft, and the main shaft gear circumference is simultaneously meshed with two reversing gears I, and a reversing gear II is coaxially arranged on the reversing gear I; a screw end gear I is respectively provided on the first screw and the third screw, and meshes with the reversing gear II; a screw end gear III is respectively provided at the ends of the second screw and the fourth screw, and the screw end gear III meshes with the main shaft gear; a screw end gear II is provided on the second screw in the first chamber, and a transition shaft parallel to the second screw is provided in the chamber, a transition gear II is provided at one end of the transition shaft, and the transition gear II meshes with the screw end gear II through the transition gear I, a bevel gear is provided at the other end of the transition shaft, and a star wheel end gear is provided at the end of the star wheel shaft, and the star wheel end gear meshes with the bevel gear.

[0010] The star wheel is provided with 3 to n blades, each blade is independently provided with a truncated cone-shaped tooth piece, and the truncated cone-shaped tooth piece is in clearance with the spiral groove of the screw rod.

[0011] The upper plane of the truncated cone-shaped tooth piece is circular, and the upper plane and the central axis of the screw are located in the same plane.

[0012] The chambers are respectively provided with air inlets and exhaust ports on the outer surface of the shell, and the exhaust ports of each stage of the chamber are connected to the air inlets of the next stage to realize the series connection of the air circuits.

[0013] The screw is a cylindrical spiral groove rotor or a truncated cone arc spiral groove rotor, and the number of spiral grooves is 2 to n.

[0014] The multi-stage large-flow compressor of the present application is connected to the main shaft by a motor or a steam turbine through a coupling when working, and then the screw and the star wheel are independently operated through the transmission and direction change of the transmission device. The screw and the star wheel are meshed with each other and maintain a certain gap. They operate independently without contact and friction. The volume of the screw in the multiple chambers is very small and easy to process. The air has a large volume flow after multi-stage compression in the sealed chamber, thereby realizing the manufacture of a large-flow compressor.

[0015] The specific connection structure of the two-stage compressor is disclosed, which adopts a structure in which two star wheels are coaxially connected to a star wheel shaft, so that the star wheel shaft is easy to process and occupies less space. The transmission device is also disclosed, which realizes the independent rotation of the star wheel and the screw through the gear, transition shaft and bevel gear structure, without contact and friction.

[0016] Furthermore, two screws are arranged in each chamber to cooperate with the star wheel, thereby improving the compression efficiency.

[0017] A truncated cone-shaped tooth piece is independently installed on each blade of the star wheel and can be repaired and replaced with the star wheel to reduce maintenance costs.

[0018] The exhaust port and the air inlet of the chamber are connected through an external pipeline, which is convenient for the processing of the shell and also convenient for maintenance.

[0019] The outer circle of the screw can be a cylindrical or truncated cone structure to ensure the strength of the screw, and the number of spiral grooves can be determined according to the actual cooperation with the star wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the internal structure of a two-stage compression double star wheel double screw combination of a large flow compressor of an embodiment.

[0021] Figure 2 This is an appearance diagram of a large flow compressor with two-stage compression according to an embodiment.

[0022] Figure 3 This is the internal structure of the two-stage compression double star wheel four-screw combination of the large flow compressor of Example 2.

[0023] Figure 4 This is a front view of the internal structure of the two-stage compression double star wheel four-screw combination of the large flow compressor of Example 2.

[0024] Figure 5 This is the appearance diagram of the two-stage compression of the large flow compressor of Example 2.

[0025] Figure 6 Schematic diagram of the cylindrical spiral groove rotor structure.

[0026] Figure 7 It is a schematic diagram of the structure of a truncated cone arc spiral groove rotor.

[0027] Figure 8 It is a cross-sectional view of the star wheel and the screw groove when they are meshed at the center. DETAILED DESCRIPTION Embodiment 1

[0028] like Figure 1 and Figure 2 As shown, a two-stage large flow compressor of a double star wheel double screw combination is provided with two independently sealed chambers in a shell 2, the first chamber is provided with a first air inlet 1-1 and a first exhaust port 1-2, the second chamber is provided with a second air inlet 2-1 and a second exhaust port 2-2, the exhaust port 1-2 of the first chamber is connected with the air inlet 2-1 of the second chamber by an external pipeline, so as to realize the series connection of the whole pipeline, and the exhaust gas of each stage enters the next stage after being cooled; a star wheel 3 and a screw 5 are respectively provided in each chamber, and the star wheels 3 of the two chambers are coaxially connected with a star wheel shaft 6, the axis of the star wheel shaft 6 is perpendicular to the axis of the screw 5, and the screw 5 of the first chamber and the second chamber in this embodiment is a truncated cone arc spiral groove rotor structure, and the appearance of the screw is as shown in FIG. Figure 7 As shown, the number of spiral grooves is 2 to n. Similarly, the following can also be used: Figure 6 The cylindrical spiral groove rotor structure described above; a main shaft 1 is provided on the housing 2, and the main shaft 1 drives the screw 5 and the star wheel 3 of each chamber to rotate independently and synchronously at a fixed speed ratio through a transmission device. The star wheel 3 is provided with 3 to n blades, and each blade is independently installed with a truncated cone-shaped tooth piece 4. The truncated cone-shaped tooth piece 4 is matched with the spiral groove clearance of the screw 5, and the upper plane of the truncated cone-shaped tooth piece 4 is circular, and the upper plane and the central axis of the screw 5 are located in the same plane, such as Figure 8 As shown; a liquid injection hole 7 is provided on the shell 2 of each chamber, and the liquid injected from the liquid injection hole 7 seals and cools the matching part between the star wheel 3 and the screw 5, thereby realizing the suction, compression and exhaust process of the corresponding chamber.

[0029] The transmission device structure of the first embodiment is as follows: a main shaft gear 11 is coaxially arranged on the main shaft 1, and the main shaft gear 11 is circumferentially meshed with two screw end gears I12 at the same time. Each screw end gear I12 is coaxially connected to one end of the screw 5 of the corresponding chamber to complete the rotation of the screw 5; a screw end gear II13 is coaxially arranged at the other end of the screw 5 in one of the chambers, and a transition shaft 15 parallel to the screw 5 is provided in the chamber, and a transition gear II16 is provided at one end of the transition shaft 15, and the transition gear II16 is meshed with the screw end gear II13 through the transition gear I14, and a bevel gear 17 is provided at the other end of the transition shaft 15, and a planetary gear 18 is provided at the end of the planetary shaft 6, and the planetary gear 18 is meshed with the bevel gear 17. Embodiment 2

[0030] like Figures 3 to 5As shown, a two-stage large flow compressor with a double star wheel and four screws is provided. Its structure is based on the structure of the first embodiment, and a screw is added in each chamber, and the two screws in each chamber cooperate with the star wheel at the corresponding position, thereby increasing the compression capacity of the compressor.

[0031] The transmission device structure of the second embodiment is as follows: a first screw 5-1 and a second screw 5-2 are provided in the first chamber, and a third screw 5-3 and a fourth screw 5-4 are provided in the second chamber; a main shaft gear 11 is coaxially provided on the main shaft 1, and the main shaft gear 11 is simultaneously meshed with two reversing gears I19 on the circumference, and a reversing gear II20 is coaxially provided on the reversing gear I19; a screw end gear I12 is provided on the first screw 5-1 and the third screw 5-3 in the two chambers, respectively, and meshes with the reversing gear II20; the second screw 5-2 and The ends of the fourth screw 5-4 are respectively provided with screw end gears III21, which mesh with the main shaft gear 11; a screw end gear II13 is provided on the second screw 5-2 in the first chamber, and a transition shaft 15 parallel to the screw 5 is provided in the chamber, a transition gear II16 is provided at one end of the transition shaft 15, and the transition gear II16 meshes with the screw end gear II13 through the transition gear I14, a bevel gear 17 is provided at the other end of the transition shaft 15, and a planetary gear 18 is provided at the end of the planetary shaft 6, and the planetary gear 18 meshes with the bevel gear 17.

[0032] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. When the compressor is a three-stage or even multi-stage compressor, the same is true. In the present invention, when working, the motor or steam turbine is connected to the main shaft 1 through a coupling, and then the screw and the star wheel are independently operated through the transmission and change of gears. The screw and the star wheel mesh with each other and maintain a certain gap. They operate independently without contact and friction. For those skilled in the art, its transmission structure can be infinitely replaced with equivalent structures. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0033] In summary, the multi-stage high-flow compressor of the present invention has the following effects:

[0034] 1. High volumetric efficiency, with an efficiency of more than 90%, and significant energy-saving effect, saving a lot of electricity, stable efficiency, and no obvious fluctuations with air intake and gas consumption;

[0035] 2. Long service life. Through high-precision gear transmission, the truncated cone-shaped gear pieces and spiral grooves do not contact and have liquid spray. The entire compressor runs smoothly, with little vibration and long service life.

[0036] 3. The single-stage pressure ratio is high, which can reach 1.6MPA. Centrifugal compressors under the same pressure require 3 or more stages of compression to complete;

[0037] 4. Low speed. The maximum speed of the screw is 3000r / min, while the impeller speed of the centrifugal compressor is as high as tens of thousands of revolutions;

[0038] 5. Small size. Due to the unique host structure, the entire compressor has a simple structure, very small size, and small space occupation;

[0039] 6. The volume flow range is wide. Since the compressor is a volumetric rotary structure, it can achieve stepless adjustment of the flow rate from 0 to 100%, while the flow rate of the centrifugal compressor can only be adjusted within the range of 70 to 100%.

Claims

1. A multi-stage large flow compressor, characterized in that: The compressor is a two-stage compression device. Two independently sealed chambers are arranged in a shell (2). The exhaust port of each chamber is connected to the air inlet of the next chamber, and the exhaust gas of each chamber enters the next chamber after being cooled. A star wheel shaft (6) runs through the two chambers. Two star wheels (3) are coaxially connected to the star wheel shaft (6), and the star wheels (3) are respectively located in two different chambers. A screw (5) perpendicular to the star wheel shaft (6) is arranged in each chamber. A main shaft (1) is arranged on the shell (2). The main shaft (1) drives the screw (5) and the star wheel (3) of each chamber to rotate independently and synchronously at a fixed speed ratio through a transmission device, and the spiral groove clearance of the star wheel (3) and the screw (5) is matched. A liquid injection hole (7) is respectively arranged on the shell (2) of each chamber. The liquid injected from the liquid injection hole (7) seals and cools the matching point between the star wheel (3) and the screw (5), thereby realizing the suction, compression and exhaust process of the corresponding chamber. The screw (5) is a round A cylindrical spiral groove rotor or a truncated cone arc spiral groove rotor, wherein the number of spiral grooves is 2 to n; the structure of the transmission device is as follows: a main shaft gear (11) is coaxially arranged on the main shaft (1), the main shaft gear (11) is circumferentially meshed with two screw end gears I (12), each screw end gear I (12) is coaxially connected to one end of the screw (5) of the corresponding chamber, so as to complete the rotation of the screw (5); a screw end gear II (13) is coaxially arranged at the other end of the screw (5) in one of the chambers, and a transition shaft (15) parallel to the screw (5) is arranged in the chamber, a transition gear II (16) is arranged at one end of the transition shaft (15), the transition gear II (16) is meshed with the screw end gear II (13) through the transition gear I (14), a bevel gear (17) is arranged at the other end of the transition shaft (15), and a star wheel end gear (18) is arranged at the end of the star wheel shaft (6), and the star wheel end gear (18) is meshed with the bevel gear (17).

2. A multi-stage high flow compressor, characterized in that: The compressor is a two-stage compression compressor. Two independently sealed chambers are arranged in a shell (2). The exhaust port of each chamber is connected to the air inlet of the next chamber, and the exhaust gas of each chamber enters the next chamber after being cooled. A star wheel shaft (6) runs through the two chambers. Two star wheels (3) are coaxially connected to the star wheel shaft (6), and the star wheels (3) are respectively located in two different chambers. Two screws (5) are arranged in each chamber and are perpendicular to the star wheel shaft (6). The star wheel (3) in each chamber is gap-matched with the spiral grooves of the two screws. A main shaft (1) is arranged on the shell (2). The main shaft (1) passes through the main shaft (1). The transmission device drives the screw (5) and the star wheel (3) of each chamber to rotate independently and synchronously at a fixed speed ratio, and the spiral grooves of the star wheel (3) and the screw (5) are matched with each other; a liquid injection hole (7) is provided on the shell (2) of each chamber, and the liquid sprayed from the liquid injection hole (7) seals and cools the matching point between the star wheel (3) and the screw (5), thereby realizing the suction, compression and exhaust process of the corresponding chamber; the screw (5) is a cylindrical spiral groove rotor or a truncated cone arc spiral groove rotor, and the number of spiral grooves is 2 to n; the structure of the transmission device is that a first screw (5-1) and a second screw (5-2) are provided in the first chamber; The second screw (5-2) is provided with a third screw (5-3) and a fourth screw (5-4) in the second chamber; a main shaft gear (11) is coaxially arranged on the main shaft (1), and the main shaft gear (11) is simultaneously meshed with two reversing gears I (19) on its circumference; a reversing gear II (20) is coaxially arranged on the reversing gear I (19); screw end gears I (12) are respectively provided on the first screw (5-1) and the third screw (5-3), and meshed with the reversing gear II (20); screw end gears III (21) are respectively provided at the ends of the second screw (5-2) and the fourth screw (5-4); The rod end gear III (21) meshes with the main shaft gear (11); a screw end gear II (13) is provided on the second screw (5-2) in the first chamber, and a transition shaft (15) parallel to the second screw (5-2) is provided in the chamber, a transition gear II (16) is provided at one end of the transition shaft (15), and the transition gear II (16) meshes with the screw end gear II (13) through the transition gear I (14), a bevel gear (17) is provided at the other end of the transition shaft (15), and a star end gear (18) is provided at the end of the star wheel shaft (6), and the star end gear (18) meshes with the bevel gear (17).

3. The multi-stage high flow compressor according to claim 1 or 2, characterized in that: The star wheel (3) is provided with 3 to n blades, each blade is independently mounted with a truncated cone-shaped tooth piece (4), and the truncated cone-shaped tooth piece (4) is clearance-matched with the spiral groove of the screw rod (5).

4. The multi-stage high flow compressor according to claim 3, characterized in that: The upper plane of the truncated cone-shaped tooth piece (4) is circular, and the upper plane and the central axis of the screw rod (5) are located in the same plane.

5. The multi-stage high flow compressor according to claim 1 or 2, characterized in that: The chambers are respectively provided with air inlets and exhaust ports on the outer surface of the shell, and the exhaust ports of each stage of the chamber are connected to the air inlets of the next stage to realize the series connection of the air circuits.

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