Multi-stage air compressor and use method thereof

Abstract

The invention discloses a multi-stage air compressor and a use method thereof, and relates to the technical field of air compressor equipment, the multi-stage air compressor comprises a first air compression unit, a second air compression unit and an air storage tank; the first air compression unit comprises a first air compressor, a second air compressor and a first motor, and the first motor is in transmission connection with the first air compressor and the second air compressor; the second air compression unit comprises a third air compressor, a fourth air compressor and a second motor, and the first motor is in transmission connection with the first air compressor and the second air compressor; the air outlet end of the first air compressor communicates with the air inlet end of the third air compressor, the air outlet end of the second air compressor communicates with the air inlet end of the fourth air compressor, the air outlet end of the third air compressor and the air outlet end of the fourth air compressor communicate with the air storage tank, and according to the scheme, air can be compressed multiple times.

Description

Technical Field

[0001] The present invention relates to the technical field of air compressor equipment, in particular to a multi-stage air compressor and a use method thereof. Background Art

[0002] An air compressor is a device used to compress gas. The structure of an air compressor is similar to that of a water pump. Most air compressors are reciprocating piston type, with rotating blades or rotating screws. There are many gas-using devices in the prior art, and different gas-using devices require different gas power. Therefore, it is very cumbersome to prepare air compressors of different powers for different types of gas-using devices. In order to solve the above problem, it is necessary to provide a multi-stage air compressor that can realize multi-stage compression of air, thereby meeting the gas supply needs of different gas-using devices. Summary of the invention

[0003] The object of the present invention is to provide a multi-stage air compressor and a method for using the same in view of the deficiencies in the prior art.

[0004] A multi-stage air compressor comprises a first air compression unit, a second air compression unit and a storage air tank;

[0005] The first air compression unit includes a first air compressor, a second air compressor and a first motor, and the first motor is transmission-connected to the first air compressor and the second air compressor;

[0006] The second air compression unit includes a third air compressor, a fourth air compressor and a second motor, and the first motor is transmission-connected to the first air compressor and the second air compressor;

[0007] The air outlet of the first air compressor is connected to the air inlet of the third air compressor, the air outlet of the second air compressor is connected to the air inlet of the fourth air compressor, and the air outlet of the third air compressor and the air outlet of the fourth air compressor are connected to the storage gas tank.

[0008] Furthermore, the first air compression unit also includes a first rotating shaft, the first motor is located in the middle of the first rotating shaft, the first motor is transmission-connected to the first rotating shaft, and the first air compressor and the second air compressor are located on both sides of the first motor and transmission-connected to the first rotating shaft.

[0009] Furthermore, the second air compression unit also includes a second rotating shaft, the second motor is located in the middle of the second rotating shaft, the second motor is transmission connected to the second rotating shaft, and the third air compressor and the fourth air compressor are located on both sides of the second motor and are transmission connected to the second rotating shaft.

[0010] Furthermore, it also includes an intercooler, the air outlet end of the first air compressor and / or the second air compressor is connected to the air inlet end of the intercooler, and the air outlet end of the intercooler is connected to the air inlet end of the third air compressor and / or the fourth air compressor.

[0011] Furthermore, it also includes a three-way regulating valve, which is arranged between the intercooler and the third air compressor and / or the fourth air compressor, the first pipe port of the intercooler is connected to the air outlet end of the intercooler, the second pipe port of the intercooler is connected to the external air, and the third pipe port of the intercooler is connected to the air inlet end of the third air compressor and / or the fourth air compressor.

[0012] Furthermore, a plurality of first air bearings are provided in the first air compression unit and the second air compression unit. The first air bearings are axial bearings, and the first air bearings are provided on both sides of the first motor and / or the second motor.

[0013] Furthermore, several of the first air bearings respectively use the blade backs of the first air compressor, the second air compressor, the third air compressor and the fourth air compressor at adjacent positions as bearing thrust surfaces.

[0014] Furthermore, a plurality of second air bearings are provided in the first air compression unit and the second air compression unit. The second air bearings are radial bearings. The first air bearings are provided on both sides of the first motor and / or the second motor.

[0015] A method for using a multi-stage air compressor, when it is necessary to generate secondary compressed air, comprises the following steps:

[0016] S1: Start the first motor and the second motor to open the first and third pipe ports of the three-way regulating valve and close the second pipe port;

[0017] S2: The first motor drives the first air compressor and the second air compressor to operate, and the first air compressor and the second air compressor compress the external air to form primary compressed air;

[0018] S3: The first-stage compressed air formed in the first air compressor and the second air compressor is transported to the intercooler, and the first-stage compressed air is cooled by the intercooler;

[0019] S4: The cooled and compressed air is delivered to the third air compressor and the fourth air compressor;

[0020] S5: further compressing the primary compressed air through the third air compressor and the fourth air compressor to form secondary compressed air;

[0021] S6: The secondary compressed air is transported to the storage tank for storage.

[0022] A method for using a multi-stage air compressor, when it is necessary to generate first-stage compressed air, comprises the following steps:

[0023] S1: Start the second motor, turn off the first motor, open the second and third pipe ports of the three-way regulating valve, and close the first pipe port;

[0024] S2: driving the third air compressor and the fourth air compressor to operate through the secondary motor, and sucking the external air connected at the second pipe opening into the third air compressor and the fourth air compressor;

[0025] S3: compressing the air through the third air compressor and the fourth air compressor to form primary compressed air;

[0026] S4: The first-stage compressed air after compression is transported to the storage tank for storage.

[0027] The advantages of the present invention compared with the prior art are:

[0028] First: In this scheme, multiple air compression units are set according to needs. The first motor drives the first air compressor and the second air compressor. The first air compressor and the second air compressor compress the external air and transmit it to the third air compressor and the fourth air compressor. The second motor drives the third air compressor and the fourth air compressor. The gas compressed on one side is compressed again by the third air compressor and the fourth air compressor, and the gas that has completed the second compression is transmitted to the storage tank for storage.

[0029] Secondly, the motor is set to simultaneously drive the air compressors on both sides to compress the air, and the first rotating shaft and the second rotating shaft are respectively linked to the first air compressor, the second air compressor, the third air compressor and the fourth air compressor, so as to ensure the structural stability of the first air compressor unit and the second air compressor unit, balance the axial force of the rotor system, and the central setting of the motor shortens the axial dimension and makes the overall structure compact.

[0030] Thirdly, an intercooler is provided in the present solution, and the temperature of the compressed gas outputted from the first air compressor and the second air compressor can be lowered by the intercooler, so as to reduce the heat load of the air compressor and increase the air intake.

[0031] Fourthly, a three-way regulating valve is provided in the present scheme. When the air needs to be compressed at the first level, the second pipe port and the third pipe port are opened, and the first pipe port is closed. At this time, the second air compression unit is started, and the second air compression unit sucks in and compresses the external air connected to the second pipe port. The compressed first-level compressed gas is then transported to the storage gas tank; when the air needs to be compressed at the second level, the first pipe port and the third pipe port are opened, and the second pipe port is closed. At this time, the first air compression unit and the second air compression unit are started, and the external air source is compressed at the first level by the first air compression unit and then transported to the second air compression unit. The compressed gas is compressed again by the second air compression unit to form the second-level compressed air and transported to the storage gas tank for storage.

[0032] Fifth: This solution also provides a plurality of first air bearings and second air bearings in the first air compressor unit and the second air compressor unit. Since there is no lubricating oil in the air bearings, the risk of grease contaminating the compressed air is further reduced, and the air bearings are non-contact, which further reduces the risk of metal friction debris contaminating the compressed air. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The overall structure of this scheme is shown in Figure 2. Figure 1 ;

[0034] Figure 2 The overall structure of this scheme is shown in Figure 2. Figure 2 ;

[0035] Figure 3 The three-way regulating valve is in the connected state 1;

[0036] Figure 4 This is the second connection state of the three-way regulating valve.

[0037] Figure numerals: first rotating shaft 110 , second rotating shaft 120 , first air compressor 210 , second air compressor 220 , third air compressor 230 , fourth air compressor 240 , first motor 310 , second motor 320 , first air bearing 400 , second air bearing 500 , three-way regulating valve 600 , intercooler 700 . DETAILED DESCRIPTION

[0038] Combined with Figure 1-4 As shown, a multi-stage air compressor includes a first air compression unit, a second air compression unit and a storage gas tank. The first air compression unit compresses external gas for the first time, and the gas compressed for the first time is transported to the second air compression unit. The compressed gas is further compressed by the second air compression unit, and the compressed gas is transported to the storage gas tank for storage.

[0039] Preferably, the first air compression unit includes a first air compressor 210, a second air compressor 220 and a first motor 310, the first motor 310 is transmission-connected to the first air compressor 210 and the second air compressor 220, the second air compression unit includes a third air compressor 230, a fourth air compressor 240 and a second motor 320, the first motor 310 is transmission-connected to the first air compressor 210 and the second air compressor 220, the air outlet end of the first air compressor 210 is connected to the air inlet end of the third air compressor 230, the air outlet end of the second air compressor 220 is connected to the air inlet end of the fourth air compressor 240, the The air outlet ends of the third air compressor 230 and the fourth air compressor 240 are connected to the storage gas tank. The first air compressor 210 and the second air compressor 220 are driven by the first motor 310. The external air is compressed by the first air compressor 210 and the second air compressor 220 and transported to the third air compressor 230 and the fourth air compressor 240. The third air compressor 230 and the fourth air compressor 240 are driven by the second motor 320. The gas compressed on one side is compressed again by the third air compressor 230 and the fourth air compressor 240, and the gas that has completed the secondary compression is transported to the storage gas tank for storage.

[0040] The first air compressor unit and the second air compressor unit in this solution have the same structure. The motor is set to drive the air compressors on both sides to compress the air at the same time, which makes it easy to balance the axial force of the rotor system. The central setting of the motor shortens the axial dimension and makes the overall structure compact.

[0041] Optionally, in the present solution, the first air compressor unit and the second air compressor unit are connected in series. On this basis, multiple air compressor units in the present solution can be set up, and multiple groups of air compressor units can be set up in series according to the output requirements of the equipment. The series-connected air compressor units are pressurized step by step to provide compressed gas with higher pressure.

[0042] The first air compression unit also includes a first rotating shaft 110, the first motor 310 is located in the middle of the first rotating shaft 110, the first motor 310 is connected to the first rotating shaft 110, the first air compressor 210 and the second air compressor 220 are located on both sides of the first motor 310 and are connected to the first rotating shaft 110, the second air compression unit also includes a second rotating shaft 120, the second motor 320 is located in the middle of the second rotating shaft 120, the second motor 320 is connected to the second rotating shaft 120, the third air compressor 230 and the fourth air compressor 240 are located on both sides of the second motor 320 and are connected to the second rotating shaft 120, the first rotating shaft 110 and the second rotating shaft 120 are respectively linked with the first air compressor 210, the second air compressor 220, the third air compressor 230 and the fourth air compressor 240, so as to ensure the structural stability of the first air compression unit and the second air compression unit, balance the axial force of the rotor system, and the central arrangement of the motor shortens the axial dimension and makes the overall structure compact.

[0043] Preferably, Figure 1 As shown, the present scheme also includes an intercooler 700, the air outlet end of the first air compressor 210 and / or the second air compressor 220 is connected to the air inlet end of the intercooler 700, and the air outlet end of the intercooler 700 is connected to the air inlet end of the third air compressor 230 and / or the fourth air compressor 240. Two intercoolers 700 are provided, the air outlet end of the first air compressor 210 is connected to the air inlet end of one intercooler 700, and the air outlet end of the intercooler 700 is connected to the third air compressor 230, and the air outlet end of the second air compressor 220 is connected to the air inlet end of another intercooler 700, and the air outlet end of the intercooler 700 is connected to the fourth air compressor 240. The intercooler 700 provided can reduce the temperature of the compressed gas output from the first air compressor 210 and the second air compressor 220, so as to reduce the heat load of the air compressor and increase the air intake.

[0044] Preferably, Figure 2As shown, the present solution also includes a three-way regulating valve 600, which is arranged between the intercooler 700 and the third air compressor 230 and / or the fourth air compressor 240. The first pipe opening of the intercooler 700 is connected to the air outlet of the intercooler 700, the second pipe opening of the intercooler 700 is connected to the external air, and the third pipe opening of the intercooler 700 is connected to the air inlet of the third air compressor 230 and / or the fourth air compressor 240. The connection of the pipeline can be controlled by the arranged three-way regulating valve 600. When the air needs to be compressed at the first level, the second pipe opening and the third pipe opening are opened. , close the first pipe port, and then start the second air compression unit. The second air compression unit will suck in the external air connected to the second pipe port and compress it, and the compressed first-level compressed gas will be transported to the storage tank; when the air needs to be compressed for a second time, open the first pipe port and the third pipe port, and close the second pipe port. At this time, start the first air compression unit and the second air compression unit, and the external air source is compressed for a first time by the first air compression unit and then transported to the second air compression unit. The compressed gas is compressed again by the second air compression unit to form secondary compressed air and transported to the storage tank for storage.

[0045] Preferably, the first air compressor unit and the second air compressor unit are further provided with a plurality of first air bearings 400, the first air bearings 400 are axial bearings, the first air bearings 400 are arranged on both sides of the first motor 310 and / or the second motor 320, and the plurality of first air bearings 400 respectively use the blade backs of the first air compressor 210, the second air compressor 220, the third air compressor and the fourth air compressor 240 at adjacent positions as bearing thrust surfaces, which can further shorten the axial dimension and make the overall structure compact. The first air compressor unit and the second air compressor unit are further provided with A plurality of second air bearings 500, wherein the second air bearings 500 are radial bearings, and the first air bearings 400 are arranged on both sides of the first motor 310 and / or the second motor 320. The first air bearings 400 and the second air bearings 500 are arranged to support and install the first air compressor 210, the second air compressor 220, the third air compressor 230 and the fourth air compressor 240. Since there is no lubricating oil in the air bearings, the risk of grease contaminating the compressed air is further reduced, and the air bearings are non-contact, which further reduces the risk of friction debris of metal parts contaminating the compressed air.

[0046] A method for using a multi-stage air compressor, when it is necessary to generate secondary compressed air, comprises the following steps:

[0047] S1: Start the first motor 310 and the second motor 320 to open the first and third ports of the three-way regulating valve 600 and close the second port;

[0048] S2: The first motor 310 drives the first air compressor 210 and the second air compressor 220 to operate, and the first air compressor 210 and the second air compressor 220 compress the external air to form primary compressed air;

[0049] S3: The primary compressed air generated by the first air compressor 210 and the second air compressor 220 is delivered to the intercooler 700, and the primary compressed air is cooled by the intercooler 700;

[0050] S4: The cooled and compressed air is delivered to the third air compressor 230 and the fourth air compressor 240;

[0051] S5: further compressing the primary compressed air through the third air compressor 230 and the fourth air compressor 240 to form secondary compressed air;

[0052] S6: The secondary compressed air is transported to the storage tank for storage.

[0053] A method for using a multi-stage air compressor, when it is necessary to generate first-stage compressed air, comprises the following steps:

[0054] S1: Start the second motor 320, turn off the first motor 310, open the second and third pipe ports of the three-way regulating valve 600, and close the first pipe port;

[0055] S2: driving the third air compressor 230 and the fourth air compressor 240 to operate through the secondary motor, and sucking the external air connected at the second pipe opening into the third air compressor and the fourth air compressor 240;

[0056] S3: compressing the air by the third air compressor 230 and the fourth air compressor 240 to form primary compressed air;

[0057] S4: The first-stage compressed air after compression is transported to the storage tank for storage.

[0058] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0059] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0061] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A multi-stage air compressor, characterized in that: It includes a first air compression unit, a second air compression unit and a storage gas tank; The first air compression unit comprises a first air compressor (210), a second air compressor (220) and a first motor (310), wherein the first motor (310) is transmission-connected to the first air compressor (210) and the second air compressor (220); The second air compression unit comprises a third air compressor (230), a fourth air compressor (240) and a second motor (320), and the first motor (310) is transmission-connected to the first air compressor (210) and the second air compressor (220); The air outlet end of the first air compressor (210) is connected to the air inlet end of the third air compressor (230), the air outlet end of the second air compressor (220) is connected to the air inlet end of the fourth air compressor (240), and the air outlet end of the third air compressor (230) and the air outlet end of the fourth air compressor (240) are connected to a storage gas tank.

2. A multi-stage air compressor according to claim 1, characterized in that: The first air compression unit also includes a first rotating shaft (110), the first motor (310) is located in the middle of the first rotating shaft (110), the first motor (310) is transmission-connected to the first rotating shaft (110), and the first air compressor (210) and the second air compressor (220) are located on both sides of the first motor (310) and are transmission-connected to the first rotating shaft (110).

3. A multi-stage air compressor according to claim 1, characterized in that: The second air compression unit also includes a second rotating shaft (120), the second motor (320) is located in the middle of the second rotating shaft (120), the second motor (320) is transmission-connected to the second rotating shaft (120), and the third air compressor (230) and the fourth air compressor (240) are located on both sides of the second motor (320) and are transmission-connected to the second rotating shaft (120).

4. A multi-stage air compressor according to claim 1, characterized in that: It also includes an intercooler (700), wherein the air outlet end of the first air compressor (210) and / or the second air compressor (220) is connected to the air inlet end of the intercooler (700), and the air outlet end of the intercooler (700) is connected to the air inlet end of the third air compressor (230) and / or the fourth air compressor (240).

5. A multi-stage air compressor according to claim 1, characterized in that: It also includes a three-way regulating valve (600), which is arranged between the intercooler (700) and the third air compressor (230) and / or the fourth air compressor (240), the first pipe opening of the intercooler (700) is connected to the air outlet end of the intercooler (700), the second pipe opening of the intercooler (700) is connected to the external air, and the third pipe opening of the intercooler (700) is connected to the air inlet end of the third air compressor (230) and / or the fourth air compressor (240).

6. A multi-stage air compressor according to claim 1, characterized in that: A plurality of first air bearings (400) are also provided in the first air compression unit and the second air compression unit. The first air bearings (400) are axial bearings. The first air bearings (400) are provided on both sides of the first motor (310) and / or the second motor (320).

7. A multi-stage air compressor according to claim 6, characterized in that: A plurality of the first air bearings (400) respectively use the blade backs of the first air compressor (210), the second air compressor (220), the third air compressor and the fourth air compressor (240) at adjacent positions as bearing thrust surfaces.

8. A multi-stage air compressor according to claim 1, characterized in that: A plurality of second air bearings (500) are also provided in the first air compression unit and the second air compression unit. The second air bearings (500) are radial bearings. The first air bearings (400) are provided on both sides of the first motor (310) and / or the second motor (320).

9. The method for using the multi-stage air compressor according to any one of claims 1 to 8, characterized in that: When it is necessary to generate secondary compressed air, the following steps are included: S1: starting the first motor (310) and the second motor (320), opening the first pipe port and the third pipe port of the three-way regulating valve (600), and closing the second pipe port; S2: The first motor (310) drives the first air compressor (210) and the second air compressor (220) to operate, and the first air compressor (210) and the second air compressor (220) compress external air to form primary compressed air; S3: The primary compressed air generated by the first air compressor (210) and the second air compressor (220) is transported to the intercooler (700), and the primary compressed air is cooled by the intercooler (700); S4: The cooled and compressed air is delivered to the third air compressor (230) and the fourth air compressor (240); S5: further compressing the primary compressed air by a third air compressor (230) and a fourth air compressor (240) to form secondary compressed air; S6: The secondary compressed air is transported to the storage tank for storage.

10. The method for using the multi-stage air compressor according to any one of claims 1 to 8, characterized in that: When it is necessary to generate primary compressed air, the following steps are included: S1: starting the second motor (320), shutting down the first motor (310), opening the second and third pipe ports of the three-way regulating valve (600), and closing the first pipe port; S2: driving the third air compressor (230) and the fourth air compressor (240) to operate by means of the secondary motor, so that the external air connected at the second pipe opening is sucked into the third air compressor (230) and the fourth air compressor (240); S3: compressing the air by means of a third air compressor (230) and a fourth air compressor (240) to form primary compressed air; S4: The first-stage compressed air after compression is transported to the storage tank for storage.

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