TW202040010A - Centrifugal air compressor capable of increasing the rotation speed of the impeller while reducing the space occupied by the gear box - Google Patents

Abstract

The present invention discloses a centrifugal air compressor comprising a gear transmission assembly. The gear transmission assembly includes an input shaft, an output shaft, an intermediate shaft arranged between the input shaft and the output shaft, a primary driving wheel mounted on the input shaft, a primary driven wheel mounted on the intermediate shaft and meshed with the primary driving wheel, a secondary driven wheel mounted on the output shaft, and a secondary driving wheel mounted on the intermediate shaft and meshed with the secondary driven wheel, thereby realizing two-stage gear transmission. Compared with the one-stage gear transmission, the transmission ratio is increased and the rotation speed of the output shaft is relatively high so that the rotation speed of the impeller mounted on the output shaft is increased. The size of the gears included in the two-stage gear transmission is relatively small and the size of the gear box used for accommodating the two-stage gear transmission assembly is reduced, which is beneficial to reduce the size of the gear box so that the space occupied by the gear box is reduced. Therefore, the centrifugal air compressor provided by the present invention can increase the rotation speed of the impeller while reducing the space occupied by the gear box.

Description

Centrifugal air compressor

The invention relates to the field of air compressors, in particular to a centrifugal air compressor.

Common centrifugal air compressors include suction port, impeller, volute, etc. The gas flowing in through the suction port is driven by the impeller and enters the volute under the action of centrifugal force and is discharged into the condenser through the volute. It has good sealing and noise The advantages of low and small vibration make the centrifugal air compressor a key equipment for compressing and transporting various gases in chemical production, which is widely used in petrochemical plants and oil refineries. Therefore, the existing centrifugal air compressor is improved. The machine is particularly necessary.

The existing centrifugal air compressor usually includes a gear box for driving the impeller to rotate at a high speed. However, the gear transmission assembly provided in the existing gear box is usually a first-stage gear transmission assembly, that is, only includes a driving shaft with a driving wheel. And the driven shaft installed with the driven wheel, the driven wheel meshes with the driving wheel, and the number of teeth of the driving wheel is greater than the number of teeth of the driven wheel, so that the speed of the driven wheel is increased, and then the speed of the impeller installed on the driven shaft is increased. When the speed of the impeller is large, correspondingly, the number of teeth of the driving wheel is larger, which means that the outer diameter of the driving wheel is larger. Correspondingly, the gear box needs to be set up with a larger space to accommodate the driving wheel, resulting in a larger gear box Installation space. In addition, the transmission ratio range of the first-stage gear transmission assembly is relatively limited, which makes it difficult for the driven shaft to achieve a high speed, so that the speed of the impeller is relatively small.

Therefore, how to reduce the space occupied by the gearbox while increasing the rotational speed of the impeller is a technical problem urgently waiting to be solved by those skilled in the art.

In view of this, the purpose of the present invention is to provide a centrifugal air compressor that adopts two-stage gear transmission, which has a relatively large transmission and is beneficial to reduce the size of the transmission gear, so that the speed of the impeller can be increased, and the gearbox can be reduced. take up space. The specific plan is as follows: The present invention provides a centrifugal air compressor, including a gear transmission assembly, and the gear transmission assembly includes: An input shaft, an output shaft, and an intermediate shaft provided between the input shaft and the output shaft; A primary driving wheel installed on the input shaft, a primary driven wheel installed on the intermediate shaft and meshing with the primary driving wheel to increase the rotational speed of the intermediate shaft; A secondary driven wheel installed on the output shaft, a secondary driving wheel installed on the intermediate shaft and meshed with the secondary driven wheel to increase the rotation speed of the output shaft.

Preferably, it further comprises a gear box which is covered on the outer periphery of the gear transmission assembly so that the axis line of the input shaft, the axis line of the output shaft and the axis line of the intermediate shaft are all in the same plane, The gear box is divided into an upper casing and a lower casing which are matched with each other by a horizontal plane where the axis line is located.

Preferably, the end of the output shaft is provided with an impeller, the side of the lower casing close to the impeller is provided with a lower volute, and the lower casing and the lower volute are integrally formed; The side of the upper casing is provided with an upper volute that cooperates with the lower volute to convey the exhaust body of the impeller, and the lower casing and the lower volute are an integral structure.

Preferably, the lower volute has a lower volute and a lower suction port communicating with the lower volute, and the upper volute has an upper volute communicated with the lower volute and connected to the upper volute. The upper suction port communicated with the volute chamber, the lower suction port and the upper suction port respectively communicate with the suction chamber where the impeller is located.

Preferably, the lower suction port and the upper suction port are communicated to form an annular suction port, or the lower suction port and the upper suction port are respectively at least one suction hole penetrating in the thickness direction.

Preferably, it also includes a casing seal which is arranged between the upper casing and the lower casing and between the upper volute and the lower volute to prevent gas leakage.

Preferably, the lower casing is provided with lower gear accommodating grooves for accommodating the primary driving wheel, the primary driven wheel, the secondary driving wheel and the secondary driven wheel respectively, and the impeller is located at the Describe the outer side of the gear accommodating groove.

Preferably, it also includes: A pressure detecting member arranged at the outlet of the upper scroll chamber and used for detecting the pressure of the exhaust body of the upper scroll chamber; A power drive connected to the input shaft and used to drive the input shaft to rotate; The controllers respectively connected to the pressure detecting element and the power driving element, when the pressure of the exhaust body of the upper scroll chamber is greater than or less than the preset pressure, the controller adjusts according to the signal sent by the pressure detecting element The torque output by the power driving member is used to adjust the input shaft rotation speed until the exhaust gas pressure of the upper scroll chamber reaches a preset pressure.

Compared with the prior art, the centrifugal air compressor provided by the present invention enables the primary driving wheel installed on the input shaft to mesh with the primary driven wheel installed on the intermediate shaft, and enables the secondary driving wheel mounted on the intermediate shaft The wheel meshes with the secondary driven wheel installed on the output shaft to form a secondary gear transmission assembly, thereby realizing secondary gear transmission. Compared with the transmission ratio of the primary gear transmission, the transmission ratio of the secondary gear transmission is relatively large , The speed of the output shaft is relatively high, so that the speed of the impeller mounted on the output shaft is increased; further, when the transmission ratio of the first-stage gear transmission is not much different from that of the second-stage gear transmission, the second-stage The size of the gear involved in the gear transmission is relatively small. Correspondingly, the size of the gear box for accommodating the two-stage gear transmission assembly becomes smaller, which is beneficial to reduce the size of the gear box, so the space occupied by the gear box is reduced.

Therefore, the centrifugal air compressor provided by the present invention can increase the speed of the impeller while reducing the space occupied by the gear box.

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 a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Please refer to Figures 1 to 5. Figure 1 is an exploded view of a centrifugal air compressor provided by a specific embodiment of the present invention; Figure 2 is an exploded view of the upper and lower casings; Figure 3 Is the assembly structure diagram of the gear transmission assembly; Figure 4 is the structure diagram of the total volute chamber formed by the upper volute chamber provided in the upper casing and the lower volute chamber provided in the lower casing; Figure 5 is the installation of the gear transmission module to the bottom Diagram of the disassembly and assembly path of the chassis.

The embodiment of the present invention discloses a centrifugal air compressor, including a gear transmission assembly. The gear transmission assembly includes an input shaft 1, an output shaft 2, and an intermediate shaft 3 arranged between the input shaft 1 and the output shaft 2. The gear transmission assembly also includes The primary driving wheel 4, the primary driven wheel 5, the secondary driving wheel 7 and the secondary driven wheel 6.

Among them, the primary driving wheel 4 is mounted on the input shaft 1, the primary driven wheel 5 is mounted on the intermediate shaft 3, the primary driving wheel 4 meshes with the primary driven wheel 5 to form a primary gear transmission, and the number of teeth of the primary driving wheel 4 is greater than that of the primary driven wheel 5. The number of teeth. When the input shaft 1 rotates, the primary driving wheel 4 rotates synchronously with the input shaft 1, while the primary driving wheel 4 drives the primary driven wheel 5 to rotate, so that the primary driven wheel 5 drives the intermediate shaft 3, and the speed of the primary driven wheel 5 is greater than The speed of the primary driving wheel 4 realizes the first increase in speed;

Similarly, the secondary driving wheel 7 is mounted on the intermediate shaft 3, the secondary driving wheel 7 meshes with the secondary driven wheel 6 to form a primary gear transmission, and the number of teeth of the secondary driving wheel 7 is greater than the number of teeth of the secondary driven wheel 6. The intermediate shaft 3 rotates under the drive of the primary driven wheel 5, and the secondary driving wheel 7 rotates synchronously with the intermediate shaft 3. At the same time, the secondary driving wheel 7 drives the secondary driven wheel 6 to rotate, so that the secondary driven wheel 6 drives the output shaft 2 , And make the rotation speed of the secondary driven wheel 6 greater than that of the secondary driving wheel 7 to achieve the second increase in speed.

Preferably, the primary driving wheel 4 and the primary driven wheel 5 are a set of helical gears with opposite rotation directions, and the secondary driving wheel 7 and the secondary driven wheel 6 are also a set of helical gears with opposite rotations, which is beneficial to improve the carrying capacity. , And the transmission is relatively stable. Of course, the primary driving wheel 4, the primary driven wheel 5, the secondary driving wheel 7 and the secondary driven wheel 6 may also be spur gears, which does not affect the realization of the objective of the present invention.

Therefore, the speed of the impeller 10 installed on the output shaft 2 is increased by the two-stage gear transmission assembly. Compared with the transmission ratio of the first-stage gear transmission, the transmission ratio of the two-stage gear transmission is relatively large, and the speed of the output shaft 2 Relatively high, so that the speed of the impeller 10 is increased; further, when the transmission ratio of the first-stage gear transmission is not much different from that of the second-stage gear transmission, the size of the gear involved in the second-stage gear transmission is relatively small , The size of the gear box used to accommodate the two-stage gear transmission assembly is reduced, which is beneficial to reduce the size of the gear box, so the space occupied by the gear box is reduced. Therefore, the centrifugal air compressor provided by the present invention can increase the speed of the impeller 10 while reducing the space occupied by the gear box.

Preferably, the present invention also includes a gear box for covering the outer periphery of the gear transmission assembly. In order to achieve smooth transmission of the gear transmission assembly, the gear box can make the axis line of the input shaft 1 and the axis line of the output shaft 2 and intermediate The axis lines of the shaft 3 are all on the same plane. Specifically, the three axis lines are on the same horizontal plane. The gear box is divided into an upper casing 8 and a lower casing 9 which are matched with each other by the horizontal plane where the axis line is located. The lower casing 9 is provided with three supporting grooves for supporting the input shaft 1, the output shaft 2 and the intermediate shaft 3, and each shaft is installed in the supporting grooves by rolling bearings, so that the lower casing 9 supports the rotation of each shaft.

Referring to Figure 5, the direction indicated by the realization arrow in the figure is the assembly direction of each axis, and the direction indicated by the dotted arrow in the figure is the disassembly direction of each axis.

When assembling, the upper casing 8 is removed, and the assembler will place the input shaft 1 with the primary driving wheel 4 down in the corresponding support groove of the lower casing 9 in the vertical direction, and then assemble the primary driven wheel 5 and the second The intermediate shaft 3 of the secondary driving wheel 7 is placed vertically downward in the corresponding supporting groove of the lower casing 9, and finally the output shaft 2 with the secondary driven wheel 6 is placed vertically downward in the lower casing 9 In the corresponding support groove, the installation of each shaft is completed in the direction indicated by the solid arrow in Figure 5, and the disassembly of each shaft is completed in the direction indicated by the dashed arrow in Figure 5, so that each shaft can be realized. The horizontal-to-horizontal disassembly and assembly method can realize quick disassembly and assembly, the disassembly and assembly time is short, the disassembly and assembly are more convenient, and it is beneficial to improve the disassembly and assembly efficiency.

The end of the output shaft 2 is provided with an impeller 10 for driving the gas to rotate, and its structure can refer to the prior art.

Considering the discharge of gas, the side of the lower casing 9 close to the impeller 10 is provided with a lower volute 91, and the side of the upper casing 8 is provided with an upper volute 81 matched with the lower volute 91 to convey the discharge of the impeller 10. gas.

Preferably, in order to further improve the efficiency of disassembly and assembly, the lower casing 9 and the lower volute 91 are integrally formed, and the lower casing 9 and the lower volute 91 are integrally formed, so that the gear box and the volute can be disassembled and assembled simultaneously. , There is no need to disassemble the volute in the process of disassembly and assembly, shorten the disassembly and assembly time, and naturally improve the disassembly and assembly efficiency. Preferably, the lower casing 9 and the lower volute 91 are directly cast as a whole, and the upper casing 8 and the upper volute 81 can also be directly cast as a whole. By adjusting the processing technology of the lower casing 9 and the upper casing 8 Avoid frequent disassembly of the volute. Of course, welding and other technologies can also be used instead of casting technology to still achieve an integrated structure without affecting the purpose of the present invention.

In this specific embodiment, the lower volute 91 having a semicircular ring shape is matched with the lower volute 91 having a semicircular ring structure. The upper volute 81 and the lower volute 91 are spliced to form an annular structure, and the impeller 10 is Set at the center of the annular structure, so that the inner side wall of the upper volute 81 near the impeller 10 and the inner side wall of the lower volute 91 near the impeller 10 form a cylindrical suction chamber. Obviously, the impeller 10 is arranged in the suction chamber, so that the impeller 10 drives the gas in the suction chamber to rotate.

Preferably, the lower volute 91 has a lower volute chamber 911, and the lower volute 91 also has a lower suction port 912 communicating with the lower volute chamber 911, so that the lower suction port 912 communicates with the lower volute chamber 911 and the suction chamber through the impeller. The gas moved by 10 flows into the lower volute chamber 911 from the lower suction port 912 under the action of centrifugal force; similarly, the upper volute 81 has an upper volute chamber 811, and the lower volute chamber 911 communicates with the upper volute chamber 811 to form an impeller 10 In the direction of rotation, the inner diameter gradually increases in the total cochlear chamber. The upper volute 81 also has an upper suction port 812 communicating with the upper volute chamber 811. The upper suction port 812 is connected to the upper volute chamber 811 and the suction chamber, and the gas moved by the impeller 10 flows in from the upper suction port 812 under the action of centrifugal force. In the upper volute chamber 811, the gas can be transported. Naturally, the lower suction port 912 and the upper suction port 812 are respectively connected to the suction chamber where the impeller 10 is located. When the impeller 10 rotates, the impeller 10 drives the gas in the suction chamber to flow into the total volute from the lower suction port 912 and the upper suction port 812 respectively. , And then exhaust gas.

Preferably, the lower suction port 912 is provided on the side of the lower volute 91 close to the lower casing 9, the upper suction port 812 is provided on the side of the upper volute 81 close to the upper casing 8, the lower suction port 912 and the upper suction port The 812 are all circular arc-shaped through holes, and the lower suction port 912 and the upper suction port 812 are connected to form an annular suction port. In view of the relatively large suction area of the annular suction port, it is convenient to transport gas quickly.

Of course, the lower suction port 912 can also be at least one suction hole provided on the inner wall of the lower volute 91, and the suction hole is a through hole penetrating along the inner wall of the lower volute 91; similarly, the upper suction port 812 is also It may be at least one suction hole provided on the inner wall of the upper volute 81, and the suction hole is a through hole penetrating along the thickness direction of the inner wall of the upper volute 81. Preferably, the central axis of the suction hole extends along the centrifugal direction of the impeller 10, so that the gas can fully flow into the total scroll chamber, and the gas delivery speed can be controlled to a certain extent. It should be noted that the inner wall of the lower volute 91 refers to the inner wall of the lower volute 91 near the impeller 10, and the inner wall of the upper volute 81 refers to the inner wall of the upper volute 81 near the impeller 10.

Of course, the structures of the upper suction port 812 and the lower suction port 912 are not limited to the above two structures, and the adoption of other types of structures does not affect the realization of the purpose of the present invention.

Preferably, considering that the gearbox needs to have good sealing performance, the present invention also includes a casing seal arranged between the upper casing 8 and the lower casing 9 and between the upper volute 81 and the lower volute 91 In order to prevent the gas from escaping from the mating surface between the upper casing 8 and the lower casing 9. The casing gasket is preferably a rubber sealing ring or a nylon sealing ring. Correspondingly, the mating surface of the upper casing 8 and the mating surface of the lower casing 9 are both provided with a sealing element installation groove to facilitate the installation of the housing seal.

Preferably, the lower casing 9 is provided with lower gear accommodating grooves 92 for accommodating the primary driving wheel 4, the primary driven wheel 5, the secondary driving wheel 7 and the secondary driven wheel 6 respectively, and the impeller 10 is located outside the lower gear accommodating groove 92 . During installation, only the output shaft 2 equipped with the impeller 10 and the secondary driven wheel 6 needs to be directly placed on the lower casing 9; for the same reason, when disassembling, only need to remove the upper casing 8 and then unload the machine The output shaft 2 equipped with the impeller 10 and the secondary driven wheel 6 can be disassembled as a whole on the shell 9, that is, the external design of the impeller 10 and the horizontal split structure between the upper casing 8 and the lower casing 9 make it possible to integrate The output shaft 2 and the components installed on the output shaft 2 are removed without removing the output shaft 2 after removing the impeller 10, which makes the disassembly and assembly more convenient and the disassembly and assembly efficiency higher.

Similarly, the upper casing 8 is provided with upper gear accommodating grooves for accommodating the primary driving wheel 4, the primary driven wheel 5, the secondary driving wheel 7 and the secondary driven wheel 6, respectively, and the lower gear accommodating groove 92 and the upper gear accommodating groove Cooperate to form a closed cavity for accommodating gear transmission components.

In order to output accurate gas pressure, the present invention also includes a pressure detection device, a power driving part and a controller, wherein the pressure detection part is provided at the outlet of the upper scroll chamber 811 for detecting the pressure of the gas discharged at the outlet of the upper scroll chamber 811. The pressure detecting member may be a pressure detecting sensor, but the type is not limited to this. The power driving part is connected with the input shaft 1 for driving the input shaft 1 to rotate. The power drive is preferably a servo motor. The controller is respectively connected with the pressure detecting part and the power driving part. When the pressure of the exhaust body in the upper volute chamber 811 is greater than or less than the preset pressure, the controller adjusts the output torque of the power driving part according to the signal sent by the pressure detecting part and adjusts the input shaft 1 to adjust the speed of the impeller 10 and then adjust the pressure of the gas discharged from the upper volute chamber 811 until the pressure of the exhaust body of the upper volute chamber 811 reaches the preset pressure, so that the output gas pressure can be reasonably controlled, which is conducive to energy saving.

The above gives a detailed introduction to the centrifugal air compressor provided by the present invention. In this article, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above examples is only used to help understand the method and the method of the present invention. Core idea; At the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and the scope of application. In summary, the content of this specification should not be construed as a limitation of the present invention .

1: input shaft 2: output shaft 3: Intermediate shaft 4: Level 1 driving wheel 5: Primary driven wheel 6: Secondary driven wheel 7: Secondary driving wheel 8: Upper case 9: Lower case 10: Impeller 81: Upper Volute 811: Upper Cochlear Chamber 812: upper suction port 91: Lower Volute 92: Lower gear receiving groove 911: Lower Cochlear Chamber 912: lower suction port

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are merely present For the embodiments of the invention, for those of ordinary skill in the art, other drawings may be obtained based on the provided drawings without creative work. Figure 1 is an exploded view of a centrifugal air compressor provided by a specific embodiment of the present invention; Figure 2 is an exploded view of the upper casing and the lower casing; Figure 3 is the assembly structure diagram of the gear transmission assembly; Figure 4 is a structural diagram of the total volute formed by the upper volute on the upper casing and the lower volute on the lower casing; Figure 5 is a path diagram of the disassembly and assembly of the gear transmission assembly to the lower casing.

1: input shaft

2: output shaft

4: Level 1 driving wheel

7: Secondary driving wheel

8: Upper case

9: Lower case

10: Impeller

81: Upper Volute

91: Lower Volute

92: Lower gear receiving groove

Claims (8)

A centrifugal air compressor includes a gear transmission assembly, and the gear transmission assembly includes: An input shaft (1), an output shaft (2), and an intermediate shaft (3) arranged between the input shaft (1) and the output shaft (2); The primary drive wheel (4) installed on the input shaft (1) is installed on the intermediate shaft (3) and meshes with the primary drive wheel (4) to increase the speed of the intermediate shaft (3) Primary driven wheel (5); A secondary driven wheel (6) installed on the output shaft (2), installed on the intermediate shaft (3) and meshed with the secondary driven wheel (6) to enlarge the output shaft (2) Two-stage driving wheel (7) with rotational speed. The centrifugal air compressor described in item 1 of the scope of patent application further includes a cover on the outer periphery of the gear transmission assembly so that the axis of the input shaft (1) and the axis of the output shaft (2) A gearbox in which the axis line and the axis of the intermediate shaft (3) are in the same plane, and the gearbox is separated by the horizontal plane where the axis line is located into an upper casing (8) and a lower casing ( 9). The centrifugal air compressor according to the second item of the scope of patent application, wherein the end of the output shaft (2) is provided with an impeller (10), and the lower casing (9) is close to the impeller (10) A lower volute (91) is provided on one side of the lower volute, the lower housing (9) and the lower volute (91) are integrally formed; the side of the upper housing (8) is provided with the lower volute The volute (91) is matched to transport the upper volute (81) of the exhaust body of the impeller (10), and the lower casing (9) and the lower volute (91) are integrally formed. The centrifugal air compressor described in item 3 of the scope of the patent application, wherein the lower volute (91) has a lower volute chamber (911) and a lower suction port ( 912), the upper volute (81) has an upper volute chamber (811) communicating with the lower volute chamber (911) and an upper suction port (812) communicating with the upper volute chamber (811), The lower suction port (912) and the upper suction port (812) are respectively communicated with the suction chamber where the impeller (10) is located. The centrifugal air compressor described in item 4 of the scope of patent application, wherein the lower suction port (912) and the upper suction port (812) are communicated to form an annular suction port, or the lower suction port ( 912) and the upper suction port (812) are respectively at least one suction hole penetrating in the thickness direction. The centrifugal air compressor described in any one of items 2 to 5 of the scope of the patent application further includes the centrifugal air compressor arranged between the upper casing (8) and the lower casing (9) and A casing seal between the upper volute (81) and the lower volute (91) for preventing gas leakage. As the centrifugal air compressor described in item 3 of the scope of the patent application, wherein the lower casing (9) is provided for accommodating the primary driving wheel (4), the primary driven wheel (5), and the The lower gear receiving groove (92) of the secondary driving wheel (7) and the secondary driven wheel (6), the impeller (10) is located outside the lower gear receiving groove (92). The centrifugal air compressor described in item 4 of the scope of patent application further includes: A pressure detecting member arranged at the outlet of the upper scroll chamber (811) and used for detecting the pressure of the exhaust body of the upper scroll chamber (811); A power driving member connected with the input shaft (1) and used for driving the input shaft (1) to rotate; The controllers respectively connected to the pressure detecting part and the power driving part, when the exhaust gas pressure of the upper scroll chamber (811) is greater than or less than a preset pressure, the controller sends The signal adjusts the torque output by the power drive member to adjust the rotation speed of the input shaft (1) until the exhaust gas pressure of the upper scroll chamber (811) reaches a preset pressure.

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