Multi-stage centrifugal magnetic suspension air compressor system and operation control energy storage method thereof

Abstract

The invention belongs to the technical field of multi-stage centrifugal magnetic suspension air compressor systems, and discloses a multi-stage centrifugal magnetic suspension air compressor system and an operation control energy storage method thereof. The multistage centrifugal magnetic suspension air compressor system comprises an air compressor assembly and a power supply assembly, wherein the air compressor assembly comprises a magnetic suspension motor, a magnetic suspension bearing, an air compressor body, an air cooler, a regulating valve and an air turbine generator. An outlet of the air compressor body communicates with an inlet of the air cooler and one end of the adjusting valve, and the other end of the adjusting valve, the air turbine generator and an inlet of the air compressor body communicate in sequence. An outlet of the air cooler in the previous air compressor assembly is communicated with an inlet of the air compressor body in the next air compressor assembly. The power supply assembly comprises an energy storage battery pack, one end of the energy storage battery pack is electrically connected with the air turbine generator in each air compressor assembly, and the other end of the energy storage battery pack is electrically connected with the magnetic suspension bearing in each air compressor assembly. According to the multistage centrifugal magnetic suspension air compressor system, energy recycling can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of multi-stage centrifugal magnetic suspension air compressor system, and particularly relates to a multi-stage centrifugal magnetic suspension air compressor system and a running control energy storage method thereof. BACKGROUND

[0002] The multi-stage centrifugal magnetic suspension air compressor combines multi-stage centrifugal compression technology and magnetic suspension bearing technology, and is widely applied due to the advantages of high efficiency, low maintenance operation and the like in the working process without mechanical contact and lubricating oil.

[0003] However, when the multi-stage centrifugal magnetic suspension air compressor is adjusted by frequency conversion, the pressure and the flow rate will change simultaneously, but the relationship is nonlinear, and the flow rate of compressed air needs to be adjusted under the condition of relatively stable pressure, so the flow rate of compressed air needs to be additionally and separately adjusted, thereby increasing the power consumption of the multi-stage centrifugal magnetic suspension air compressor.

[0004] Therefore, it is urgent to provide a multi-stage centrifugal magnetic suspension air compressor system and a running control energy storage method thereof to solve the above problems. SUMMARY

[0005] A first object of the present application is to provide a multi-stage centrifugal magnetic suspension air compressor system capable of generating electric energy stored in an energy storage battery pack while adjusting the flow rate of compressed air, thereby supplying power to the magnetic suspension bearing and realizing energy recycling.

[0006] To achieve this object, the present application adopts the following technical solutions:

[0007] The multi-stage centrifugal magnetic suspension air compressor system comprises:

[0008] A plurality of air compressor assemblies, the air compressor assembly comprising a magnetic suspension motor, a magnetic suspension bearing, an air compressor body, an air cooler, a regulating valve and an air turbine generator, the magnetic suspension motor being drivingly connected to the air compressor body, the magnetic suspension bearing suspending and supporting the rotating parts of the magnetic suspension motor and the air compressor body, the outlet of the air compressor body being in communication with the inlet of the air cooler and one end of the regulating valve, respectively, the other end of the regulating valve, the air turbine generator and the inlet of the air compressor body being sequentially communicated, the plurality of air compressor assemblies being sequentially arranged along a first direction, in the adjacent two air compressor assemblies, the outlet of the air cooler in the former air compressor assembly being in communication with the inlet of the air compressor body in the latter air compressor assembly, the first direction being the flow direction of compressed air;

[0009] A power supply assembly, which comprises an energy storage battery group, one end of the energy storage battery group is electrically connected with the air turbine generator in each air compressor assembly respectively, and the other end is electrically connected with the magnetic suspension bearing in each air compressor assembly respectively.

[0010] As an optional technical solution of the multi-stage centrifugal magnetic suspension air compressor system, the second current transformer is arranged between the air turbine generator and the energy storage battery group in each air compressor assembly, and the second current transformer can convert the power generated by the air turbine generator into direct current for storage in the energy storage battery group.

[0011] As an optional technical solution of the multi-stage centrifugal magnetic suspension air compressor system, the power supply assembly further comprises a first circuit breaker, one end of the first circuit breaker is connected with the energy storage battery group, and the other end is connected with the magnetic suspension bearing in each air compressor assembly respectively.

[0012] As an optional technical solution of the multi-stage centrifugal magnetic suspension air compressor system, the power supply assembly further comprises an external power source and a second circuit breaker, one end of the second circuit breaker is connected with the external power source, and the other end is connected with the magnetic suspension bearing in the air compressor assembly.

[0013] As an optional technical solution of the multi-stage centrifugal magnetic suspension air compressor system, a first transformer and a first current transformer are arranged between the external power source and the second circuit breaker.

[0014] The second object of the application is to provide a multi-stage centrifugal magnetic suspension air compressor system operation control energy storage method, which can recover and utilize energy while controlling the operation of the multi-stage centrifugal magnetic suspension air compressor system.

[0015] To achieve this object, the application adopts the following technical solutions:

[0016] The multi-stage centrifugal magnetic suspension air compressor system operation control energy storage method is used for operating and controlling the above-mentioned multi-stage centrifugal magnetic suspension air compressor system, and the multi-stage centrifugal magnetic suspension air compressor system operation control energy storage method comprises:

[0017] When the external gas consumption decreases, the frequency of the magnetic suspension motor in each air compressor assembly is simultaneously reduced until the pressure of the compressed air flowing through the air cooler in each air compressor assembly reaches a first set value, then the frequency of the magnetic suspension motor in each air compressor assembly is no longer adjusted, and the flow of the compressed air flowing through the air cooler in each air compressor assembly is monitored at this time.

[0018] If the flow of compressed air meets a second set value, keep the regulating valve in each air compressor assembly closed;

[0019] If the flow of compressed air is higher than the second set value, open the regulating valve in the first group of air compressor assemblies along the second direction, the compressed air from the corresponding air compressor body outlet drives the corresponding air turbine generator to generate electricity and then returns to the corresponding air compressor body inlet, the air turbine generator generates electricity and charges the energy storage battery pack, when the regulating valve in the first group of air compressor assemblies along the second direction is fully open, if the flow of compressed air after the air cooler in each air compressor assembly is still higher than the second set value, open the regulating valve in the second group of air compressor assemblies along the second direction, and judge whether to open the regulating valve in the next group of air compressor assemblies in the same way until all the regulating valves in the air compressor assemblies are opened.

[0020] The second direction is opposite to the first direction.

[0021] As an optional technical solution of the operation control energy storage method of the multi-stage centrifugal magnetic suspension air compressor system, the operation control energy storage method of the multi-stage centrifugal magnetic suspension air compressor system further comprises:

[0022] When the external air consumption needs to be increased, confirm that the regulating valve in each air compressor assembly is open, reduce the opening degree of the regulating valve in the first group of air compressor assemblies along the second direction until it is fully closed, so as to increase the flow of compressed air after the air cooler, if the regulating valve in the first group of air compressor assemblies along the second direction is fully closed, and the flow of compressed air after the air cooler in each air compressor assembly still needs to be increased, reduce the opening degree of the regulating valve in the second group of air compressor assemblies along the second direction until it is fully closed, and judge whether to adjust the regulating valve in the next group of air compressor assemblies in the same way, and so on until the regulating valve in all air compressor assemblies is fully closed.

[0023] If the regulating valve in all air compressor assemblies is fully closed, and the flow of compressed air after the air cooler in each air compressor assembly still needs to be increased, increase the frequency of the magnetic suspension motor in all air compressor assemblies at the same time until the magnetic suspension motor is 100% rated power.

[0024] As an optional technical solution of the operation control energy storage method of the multi-stage centrifugal magnetic suspension air compressor system, the operation control energy storage method of the multi-stage centrifugal magnetic suspension air compressor system further comprises:

[0025] When the energy storage battery pack is greater than 30%, the magnetic suspension bearing is powered by the energy storage battery pack.

[0026] As an optional technical solution of the energy storage method for the operation control of the multi-stage centrifugal magnetic suspension air compressor system, when the energy storage battery pack is less than 20%, the magnetic suspension bearing is powered by an external power supply.

[0027] As an optional technical solution of the energy storage method for the operation control of the multi-stage centrifugal magnetic suspension air compressor system, when the energy storage battery pack is greater than or equal to 90% and the power generation of the air turbine generator is greater than the power consumption of the magnetic suspension bearing, the energy storage battery pack supplies the excess power to the outside.

[0028] The beneficial effects of the present application are as follows:

[0029] The multi-stage centrifugal magnetic suspension air compressor system provided by the present application comprises an air compressor assembly and a power supply assembly. The air compressor assembly comprises a magnetic suspension motor, a magnetic suspension bearing, an air compressor body, an air cooler, a regulating valve and an air turbine generator. The magnetic suspension motor is drivingly connected to the air compressor body to drive the air compressor body to compress air. The magnetic suspension bearing suspends and supports the rotating parts of the magnetic suspension motor and the air compressor body, thereby reducing friction. The outlet of the air compressor body is in communication with the inlet of the air cooler and one end of the regulating valve. The other end of the regulating valve, the air turbine generator and the inlet of the air compressor body are sequentially communicated. When the regulating valve is opened, the compressed air from the air compressor body is divided into two parts. One part enters the air cooler to be cooled and then is supplied to the outside (or enters the next air compressor body for further compression). The other part passes through the air passage of the air turbine generator and returns to the inlet of the air compressor body, thereby reducing the amount of air supplied to the outside. Meanwhile, the compressed air drives the air turbine generator to generate electricity, and the generated electricity is stored in the battery pack and then is used by the magnetic suspension bearing, thereby realizing energy recycling. The multiple air compressor bodies and the multiple air coolers in the multiple air compressor assemblies can realize multi-stage compression and cooling of external air, thereby improving work efficiency. Meanwhile, multi-stage energy recycling is also realized. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is the schematic diagram of the multi-stage centrifugal magnetic suspension air compressor system provided by the present application.

[0031] In the drawings:

[0032] 110. Magnetic levitation motor; 110a. Primary magnetic levitation motor; 110b. Secondary magnetic levitation motor; 120. Magnetic levitation bearing; 120a. Primary magnetic levitation bearing; 120b. Secondary magnetic levitation bearing; 130. Air compressor body; 130a. Primary air compressor body; 130b. Secondary air compressor body; 140. Air cooler; 140a. Primary air cooler; 140b. Secondary air cooler; 150. Regulating valve; 150a. Primary regulating valve; 150b. Secondary regulating valve; 160. Air turbine generator; 160a. Primary air turbine generator; 160b. Secondary air turbine generator; 170. Second converter; 211. Energy storage battery assembly; 212. First circuit breaker; 221. External power supply; 222. Second circuit breaker; 223. First transformer; 224. First converter; 300. Air filter. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0034] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0037] This embodiment provides a multi-stage centrifugal magnetic levitation air compressor system. This system can generate electrical energy and store it in an energy storage battery pack while regulating the flow rate of compressed air, thereby powering the magnetic levitation bearing and realizing energy recovery and utilization.

[0038] Specifically, such as Figure 1 As shown, the multi-stage centrifugal magnetic levitation air compressor system includes an air compressor assembly and a power supply assembly. The air compressor assembly includes a magnetic levitation motor 110, a magnetic levitation bearing 120, an air compressor body 130, an air cooler 140, a regulating valve 150, and an air turbine generator 160. The magnetic levitation motor 110 drives and connects to the air compressor body 130. The magnetic levitation bearing 120 levitates and supports the rotating parts of the magnetic levitation motor 110 and the air compressor body 130. Specifically, the impeller of the air compressor body 130 is fixedly mounted on the rotor of the magnetic levitation motor 110, and the housing of the air compressor body 130 is fixedly connected to the housing of the magnetic levitation motor 110. The magnetic levitation bearing 120 levitates and supports the rotor of the magnetic levitation motor 110 and the impeller of the air compressor body 130. The outlet of the air compressor body 130 is connected to the inlet of the air cooler 140 and one end of the regulating valve 150, respectively. The other end of the regulating valve 150, the air turbine generator 160, and the inlet of the air compressor body 130 are sequentially connected. Multiple air compressor assemblies are arranged sequentially along a first direction. In adjacent air compressor assemblies, the outlet of the air cooler 140 in the preceding air compressor assembly is connected to the inlet of the air compressor body 130 in the following air compressor assembly. The first direction is the direction of compressed air flow. The power supply assembly includes an energy storage battery pack. One end of the energy storage battery pack is electrically connected to the air turbine generator 160 in each air compressor assembly, and the other end is electrically connected to the magnetic levitation bearing 120 in each air compressor assembly.

[0039] Based on the above design, the magnetic levitation motor 110 drives the air compressor body 130, which in turn compresses air. The magnetic levitation bearing 120 suspends and supports the rotating parts of the magnetic levitation motor 110 and the air compressor body 130, reducing friction. The outlet of the air compressor body 130 is connected to the inlet of the air cooler 140 and one end of the regulating valve 150. The other end of the regulating valve 150, the air turbine generator 160, and the inlet of the air compressor body 130 are connected in sequence. When the regulating valve 150 is opened, the compressed air from the air compressor body 130 is split. One part enters the air cooler 140 for cooling and then supplies air to the outside (or enters the next set of air compressor bodies 130 for further compression), while the other part returns to the inlet of the air compressor body 130 through the air passage of the air turbine generator 160, reducing the amount of air supplied to the outside. At the same time, this part of the compressed air can drive the air turbine generator 160 to generate electricity, which can be stored in the battery pack and then used by the magnetic levitation bearing 120, realizing energy recovery and utilization. The multiple air compressor bodies 130 and multiple air coolers 140 in the multi-group air compressor assembly can realize multi-stage compression and cooling of external air, with high working efficiency; at the same time, it can also realize multi-stage energy recovery and utilization.

[0040] In this embodiment, the air compressor assembly consists of two groups. The components in the first group along the first direction are a primary magnetic levitation motor 110a, a primary magnetic levitation bearing 120a, a primary air compressor body 130a, a primary air cooler 140a, a primary regulating valve 150a, and a primary air turbine generator 160a. The components in the second group are a secondary magnetic levitation motor 110b, a secondary magnetic levitation bearing 120b, a secondary air compressor body 130b, a secondary air cooler 140b, a secondary regulating valve 150b, and a secondary air turbine generator 160b.

[0041] In actual operation, atmospheric air is filtered by air filter 300 and then enters the first-stage air compressor body 130a for compression. After being cooled by the first-stage air cooler 140a, the compressed air enters the second-stage air compressor body 130b for compression. After being compressed again, the compressed air is cooled by the second-stage air cooler 140b. Finally, the compressed air (compressed air) is supplied to the outside after its pressure, flow rate and temperature meet the requirements.

[0042] Optionally, a second converter 170 is provided between the air turbine generator 160 in each air compressor assembly and the energy storage battery pack. The second converter 170 can convert the power generated by the air turbine generator 160 of the corresponding assembly into direct current for storage in the energy storage battery pack.

[0043] Optionally, the power supply assembly also includes a first circuit breaker 212. One end of the first circuit breaker 212 is connected to the energy storage battery pack, and the other end is connected to the magnetic levitation bearing 120 in each air compressor assembly. The first circuit breaker 212 is set so that the magnetic levitation bearing 120 can flexibly use the power in the energy storage battery pack.

[0044] Furthermore, the power supply assembly also includes an external power supply 221 and a second circuit breaker 222. One end of the second circuit breaker 222 is connected to the external power supply 221, and the other end is connected to the magnetic levitation bearing 120 in the air compressor assembly. By setting the first circuit breaker 212 and the second circuit breaker 222, the magnetic levitation bearing 120 can flexibly choose to be powered by the energy storage battery pack or by the external power supply 221.

[0045] Furthermore, a first transformer 223 and a first converter 224 are sequentially provided between the external power supply 221 and the second circuit breaker 222. The first transformer 223 and the first converter 224 transform the AC power from the external power supply 221 into DC power to supply the magnetic levitation bearing 120.

[0046] This embodiment also provides an operation control energy storage method for a multi-stage centrifugal magnetic levitation air compressor system. This operation control energy storage method for a multi-stage centrifugal magnetic levitation air compressor system can recover and utilize energy while controlling the operation of the multi-stage centrifugal magnetic levitation air compressor system.

[0047] Specifically, the operation control energy storage method for the multi-stage centrifugal magnetic levitation air compressor system is used to operate and control the aforementioned multi-stage centrifugal magnetic levitation air compressor system. The operation control energy storage method for the multi-stage centrifugal magnetic levitation air compressor system includes:

[0048] When the external air consumption decreases, the frequency of the magnetic levitation motor 110 in each air compressor assembly is reduced until the pressure of the compressed air flowing through the air cooler 140 in each air compressor assembly reaches the first set value. Then, the frequency of the magnetic levitation motor 110 in each air compressor assembly is no longer adjusted, and the flow rate of the compressed air flowing through the air cooler 140 in each air compressor assembly is monitored. If the compressed air flow rate meets the second set value, the regulating valve 150 in each group of air compressor components remains closed. If the compressed air flow rate is higher than the second set value, the regulating valve 150 in the first group of air compressor components along the second direction is opened. The compressed air from the outlet of the corresponding air compressor body 130 drives the corresponding air turbine generator 160 to generate electricity and then returns to the inlet of the corresponding air compressor body 130. The air turbine generator 160 generates electricity and charges the energy storage battery pack. When the regulating valve 150 in the first group of air compressor components along the second direction is fully open, if the flow rate of compressed air after passing through the air cooler 140 in each group of air compressor components is still higher than the second set value, the regulating valve 150 in the second group of air compressor components along the second direction is opened. The same method is used to determine whether to open the regulating valve 150 in the next group (the third, fourth, fifth, etc. along the second direction) of air compressor components in sequence, until the regulating valve 150 in all groups of air compressor components is opened.

[0049] It should be noted that the second direction is opposite to the first direction.

[0050] This operation control energy storage method involves reducing the frequency of the magnetic levitation motors 110 in each air compressor assembly when the external air consumption decreases. This reduces the pressure and flow rate of the final compressed air (air after multi-stage compression and cooling). Because pressure and flow rate change non-linearly, the pressure usually reaches the first set value first. Therefore, once the pressure reaches the first set value, the frequency of the magnetic levitation motors 110 in each air compressor assembly is no longer adjusted. Instead, the regulating valves 150 are opened to regulate the flow rate. However, not all regulating valves 150 are opened. The regulating valves 150 in the first air compressor assembly along the second direction (i.e., the last air compressor assembly along the first direction) are opened first. At this time, part of the compressed air from the outlet of the corresponding air compressor body 130 enters the air cooler 140 for cooling before being supplied to the outside. The other part returns to the air compressor body 130 of the corresponding assembly through the air turbine generator 160, reducing the amount of air supplied to the outside. Simultaneously, this diverted portion of compressed air can enter the air turbine generator 160 to drive the air turbine generator 160 to generate electricity. The generated electricity can be stored in the battery pack. For use in magnetic levitation bearing 120, energy recovery and utilization are achieved. During this process, the opening of the regulating valve 150 is adjusted to make the flow rate of compressed air reach the second set value. If the flow rate of the last compressed air is still higher than the second set value when the regulating valve 150 in the first group of air compressor assemblies along the second direction is fully open, the regulating valve 150 in the second group of air compressor assemblies along the second direction is opened. If the flow rate of the last compressed air is still higher than the second set value, the regulating valves 150 in the third, fourth, and fifth groups of air compressor assemblies along the second direction are opened, until the regulating valves 150 in all groups of air compressor assemblies are opened.

[0051] Taking two sets of air compressor components as an example, the external air is compressed and cooled in two stages. Specifically, when the external air consumption decreases, the frequencies of the first-stage magnetic levitation motor 110a and the second-stage magnetic levitation motor 110b are simultaneously reduced until the pressure of the compressed air coming out of the second-stage air cooler 140b reaches a first set value. At this point, the frequencies of the first-stage magnetic levitation motor 110a and the second-stage magnetic levitation motor 110b are no longer adjusted, and the flow rate of the compressed air coming out of the second-stage air cooler 140b is monitored. If the flow rate of the compressed air meets the second set value, the primary regulating valve 150a and the secondary regulating valve 150b remain closed. If the flow rate of the compressed air is higher than the second set value, the secondary regulating valve 150b is opened. The compressed air from the outlet of the secondary air compressor body 130b drives the secondary air turbine generator 160b to generate electricity and then returns to the secondary air compressor body 130b. The secondary air turbine generator 160b generates electricity and charges the energy storage battery pack. When the secondary regulating valve 150b is fully open, if the flow rate of the compressed air from the secondary air cooler 140b is still higher than the second set value, the primary regulating valve 150a is opened until the primary regulating valve 150a is fully open.

[0052] Furthermore, the operation control energy storage method of this multi-stage centrifugal magnetic levitation air compressor system also includes:

[0053] When the external air consumption needs to be increased, confirm that the regulating valves 150 in each group of air compressor assemblies are all in the open state. Reduce the opening of the regulating valves 150 in the first group of air compressor assemblies along the second direction until they are fully closed, so as to increase the flow rate of compressed air after passing through the air cooler 140. If the regulating valves 150 in the first group of air compressor assemblies along the second direction are fully closed, and the flow rate of compressed air after passing through the air cooler 140 in each group of air compressor assemblies still needs to be increased, then reduce the opening of the regulating valves 150 in the second group of air compressor assemblies along the second direction until they are fully closed. Use the same method to determine whether to adjust the regulating valves 150 in the next group of air compressor assemblies, and so on, until the regulating valves 150 in all groups of air compressor assemblies are fully closed. If the regulating valves 150 in all air compressor assemblies are fully closed, the flow rate of compressed air after passing through the air coolers 140 in each air compressor assembly still needs to be increased. At the same time, the frequency of the magnetic levitation motors 110 in all air compressor assemblies should be increased until the magnetic levitation motors 110 reach 100% of their rated power.

[0054] This operation control energy storage method involves gradually closing the regulating valves 150 in each air compressor assembly as external air consumption increases to increase the compressed air flow. If all regulating valves 150 in all air compressor assemblies are closed, and the compressed air flow still needs to be increased, then the frequency of all magnetic levitation motors 110 is increased. In other words, energy consumption is saved by first regulating the flow through the regulating valves 150 and then by regulating the frequency of the magnetic levitation motors 110.

[0055] Taking two sets of air compressor components as an example, when the external air consumption needs to be increased, confirm that both the primary regulating valve 150a and the secondary regulating valve 150b are open. Reduce the opening of the secondary regulating valve 150b until it is fully closed to increase the flow rate of compressed air from the secondary air cooler 140b. If the secondary regulating valve 150b is fully closed, and the flow rate of compressed air from the secondary air cooler 140b still needs to be increased, then reduce the opening of the primary regulating valve 150a until it is fully closed. If both the primary regulating valve 150a and the secondary regulating valve 150b are fully closed, and the flow rate of compressed air from the secondary air cooler 140b still needs to be increased, then simultaneously increase the frequency of both the primary magnetic levitation motor 110a and the secondary magnetic levitation motor 110b until both motors are operating at 100% of their rated power.

[0056] It should be noted that, in this embodiment, the rated flow rate of the air compressor body 130 is 60 Nm³. 3 / h, the pressure of the compressed air at the outlet of the secondary air cooler 140b is controlled between 0.8MPa and 0.82MPa, and the temperature is controlled between 78℃ and 80℃.

[0057] Optionally, the energy storage method for operation control of this multi-stage centrifugal magnetic levitation air compressor system also includes:

[0058] When the energy storage battery pack has a charge of more than 30%, the energy storage battery pack can meet the power demand of the magnetic levitation bearing 120. At this time, the first circuit breaker 212 is closed and the second circuit breaker 222 is opened, and the energy storage battery pack supplies power to the magnetic levitation bearing 120.

[0059] When the energy storage battery pack has less than 20% charge, the energy storage battery pack cannot meet the power demand of the magnetic levitation bearing 120. At this time, the first circuit breaker 212 is disconnected and the second circuit breaker 222 is closed, and the external power supply 221 supplies power to the magnetic levitation bearing 120.

[0060] When the energy storage battery pack has a charge of 90% or more, and the power output of the air turbine generator 160 is greater than the power consumption of the magnetic levitation bearing 120, the energy storage battery pack not only meets the power consumption of the magnetic levitation bearing 120, but also has surplus power. At this time, the first circuit breaker 212 and the second circuit breaker 222 are closed. The energy storage battery pack supplies power to the magnetic levitation bearing 120 and also supplies the excess power to the external power source 221.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A multi-stage centrifugal magnetic levitation air compressor system, characterized in that, include: Multiple air compressor assemblies are provided, each including a magnetic levitation motor (110), a magnetic levitation bearing (120), an air compressor body (130), an air cooler (140), a regulating valve (150), and an air turbine generator (160). The magnetic levitation motor (110) drives and connects to the air compressor body (130). The magnetic levitation bearing (120) suspends and supports the rotating parts of the magnetic levitation motor (110) and the air compressor body (130). The outlet of the air compressor body (130) is connected to the air cooler. The inlet of the air cooler (140) is connected to one end of the regulating valve (150), and the other end of the regulating valve (150), the air turbine generator (160) and the inlet of the air compressor body (130) are connected in sequence. Multiple sets of air compressor assemblies are arranged in sequence along the first direction. In two adjacent sets of air compressor assemblies, the outlet of the air cooler (140) in the first set of air compressor assemblies is connected to the inlet of the air compressor body (130) in the second set of air compressor assemblies. The first direction is the flow direction of compressed air. The power supply component includes an energy storage battery pack, one end of which is electrically connected to the air turbine generator (160) in each of the air compressor assemblies, and the other end of which is electrically connected to the magnetic levitation bearing (120) in each of the air compressor assemblies.

2. The multi-stage centrifugal magnetic levitation air compressor system according to claim 1, characterized in that, Each air compressor assembly has a second converter (170) between the air turbine generator (160) and the energy storage battery pack. The second converter (170) can convert the power generated by the air turbine generator (160) of the corresponding group into direct current for storage in the energy storage battery pack.

3. The multi-stage centrifugal magnetic levitation air compressor system according to claim 1, characterized in that, The power supply assembly also includes a first circuit breaker (212), one end of which is connected to the energy storage battery pack, and the other end is connected to the magnetic levitation bearing (120) in each of the air compressor assemblies.

4. The multi-stage centrifugal magnetic levitation air compressor system according to claim 3, characterized in that, The power supply assembly also includes an external power supply (221) and a second circuit breaker (222), one end of which is connected to the external power supply (221), and the other end is connected to the magnetic levitation bearing (120) in the air compressor assembly.

5. The multi-stage centrifugal magnetic levitation air compressor system according to claim 4, characterized in that, A first transformer (223) and a first converter (224) are provided between the external power supply (221) and the second circuit breaker (222).

6. A method for operation control and energy storage of a multi-stage centrifugal magnetic levitation air compressor system, characterized in that, The method for operating and controlling the multi-stage centrifugal magnetic levitation air compressor system according to any one of claims 1-5, wherein the energy storage method for operating and controlling the multi-stage centrifugal magnetic levitation air compressor system comprises: When the external air consumption decreases, the frequency of the magnetic levitation motor (110) in each group of air compressor assemblies is reduced until the pressure of the compressed air after flowing through the air cooler (140) in each group of air compressor assemblies reaches the first set value. Then, the frequency of the magnetic levitation motor (110) in each group of air compressor assemblies is no longer adjusted, and the flow rate of the compressed air after flowing through the air cooler (140) in each group of air compressor assemblies is monitored at this time. If the flow rate of the compressed air meets the second set value, the regulating valve (150) in each group of air compressor assemblies remains closed; If the flow rate of the compressed air is higher than the second set value, the regulating valve (150) in the first group of air compressor assemblies along the second direction is opened. The compressed air from the outlet of the corresponding air compressor body (130) drives the corresponding air turbine generator (160) to generate electricity and then returns to the inlet of the corresponding air compressor body (130). The air turbine generator (160) generates electricity and charges the energy storage battery pack. When the regulating valve (150) in the first group of air compressor assemblies along the second direction is fully open, if the flow rate of the compressed air after passing through the air cooler (140) in each group of air compressor assemblies is still higher than the second set value, the regulating valve (150) in the second group of air compressor assemblies along the second direction is opened. The same method is used to determine whether to open the regulating valve (150) in the next group of air compressor assemblies in sequence, until the regulating valve (150) in all groups of air compressor assemblies is opened. The second direction is opposite to the first direction.

7. The operation control and energy storage method for a multi-stage centrifugal magnetic levitation air compressor system according to claim 6, characterized in that, The operation control and energy storage method for the multi-stage centrifugal magnetic levitation air compressor system also includes: When the external air consumption needs to be increased, confirm that the regulating valves (150) in each group of air compressor assemblies are all in the open state, reduce the opening of the regulating valves (150) in the first group of air compressor assemblies along the second direction until they are fully closed, so as to increase the flow rate of the compressed air after the air cooler (140). If the regulating valves (150) in the first group of air compressor assemblies along the second direction are fully closed, and the flow rate of the compressed air after the air cooler (140) in each group of air compressor assemblies still needs to be increased, then reduce the opening of the regulating valves (150) in the second group of air compressor assemblies along the second direction until they are fully closed. Use the same method to determine whether to adjust the regulating valves (150) in the next group of air compressor assemblies until the regulating valves (150) in all groups of air compressor assemblies are fully closed. If all the regulating valves (150) in the air compressor assemblies are fully closed, the flow rate of the compressed air after passing through the air cooler (140) in each air compressor assembly still needs to be increased, and the frequency of the magnetic levitation motor (110) in all the air compressor assemblies is increased until the magnetic levitation motor (110) is at 100% rated power.

8. The operation control and energy storage method for a multi-stage centrifugal magnetic levitation air compressor system according to claim 6, characterized in that, The operation control and energy storage method for the multi-stage centrifugal magnetic levitation air compressor system also includes: When the energy storage battery pack has a charge of more than 30%, the energy storage battery pack supplies power to the magnetic levitation bearing (120).

9. The operation control and energy storage method for a multi-stage centrifugal magnetic levitation air compressor system according to claim 6, characterized in that, When the energy storage battery pack has less than 20% charge, the magnetic levitation bearing (120) is powered by an external power source (221).

10. The operation control and energy storage method for a multi-stage centrifugal magnetic levitation air compressor system according to claim 6, characterized in that, When the energy storage battery pack has a charge of 90% or more, and the power output of the air turbine generator (160) is greater than the power consumption of the magnetic levitation bearing (120), the energy storage battery pack will supply the excess power to the outside.

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