WO2020177307A1 - 风冷磁悬浮机组的控制方法和风冷磁悬浮机组 - Google Patents
风冷磁悬浮机组的控制方法和风冷磁悬浮机组 Download PDFInfo
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- WO2020177307A1 WO2020177307A1 PCT/CN2019/108266 CN2019108266W WO2020177307A1 WO 2020177307 A1 WO2020177307 A1 WO 2020177307A1 CN 2019108266 W CN2019108266 W CN 2019108266W WO 2020177307 A1 WO2020177307 A1 WO 2020177307A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
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- the invention belongs to the technical field of air-conditioning units, and specifically provides a control method of an air-cooled magnetic levitation unit and an air-cooled magnetic levitation unit.
- some central air conditioners are equipped with air-cooled magnetic levitation units, and some air-cooled magnetic levitation units are equipped with dual compressors.
- air-cooled magnetic levitation units equipped with dual compressors The cooling capacity adjustment range is larger, and when one compressor fails/alarms, the other compressor can maintain the normal operation of the air-cooled magnetic levitation unit.
- this field needs a new control method of air-cooled magnetic levitation unit and corresponding air-cooled magnetic levitation unit to solve the above problems.
- the present invention A control method of an air-cooled magnetic levitation unit is provided.
- the air-cooled magnetic levitation unit includes two compressors.
- the control method includes: when the unit is in a single compressor operation mode, determining whether the unit meets preset conditions; Set the conditions to reduce the load of the running compressor to run, and then turn on the compressor that is not running to switch the unit to the dual-compressor operation mode.
- the preset conditions include that the exhaust pressure of the unit is less than the preset pressure and lasts for the first preset time, the outlet water temperature of the unit is greater than the preset temperature and lasts for the second preset time, and the running The compressor's full-load operation time reaches the third preset time and the compressor that is not running has no fault.
- the preset pressure is 1.1 MPa.
- the first preset time and the second preset time are both 180 seconds, and the third preset time is 60 seconds.
- the step of "reducing the load of the running compressor” specifically includes: reducing the running compressor to the minimum load operation.
- the step of "reducing the load of the running compressor, and then turning on the compressor that is not running” specifically includes: reducing the load of the running compressor and continuing the fourth preset Time, and then turn on the compressor that is not running.
- the fourth preset time is 30 seconds.
- control method while the step of "turning on the compressor that is not running", the control method further includes: increasing the load of the running compressor to run.
- the present invention also provides an air-cooled magnetic levitation unit, which includes a controller configured to execute the above-mentioned control method.
- the unit further includes a cylinder, and both compressors are arranged in the cylinder.
- the running compressor Reduce the load, and then start the compressor that is not in operation.
- the pressure distribution of the unit can be avoided, especially for the unit with two compressors in the same cylinder, which can ensure the pressure balance in the cylinder, thereby ensuring the operation of the unit. Stability, and because the unit always keeps running, there will be no short-term fluctuations in water temperature, which will not affect the normal use of users and improve user experience.
- the unit is switched from single compressor operation mode to dual compressor operation mode only when the unit is in single compressor operation mode and the preset conditions are met.
- the unit when the unit is in single compressor operation mode, When the full load duration of the unit reaches a long time, the unit discharge pressure is insufficient, and the outlet water temperature is too high, indicating that the single compressor operation can no longer meet the cooling requirements of the unit.
- the compressor should be added to increase the unit discharge.
- the air pressure reduces the temperature of the outlet water. Therefore, the compressor can be started under the premise that the compressor is not in operation, thereby increasing the exhaust pressure of the unit and lowering the temperature of the outlet water, thereby meeting the cooling requirements of the unit and meeting the needs of users. Improve user experience.
- the compressor that is not running is started, the compressor that has been running is increased to run.
- the stability of the unit can be ensured, and the exhaust pressure of the unit can be gradually increased, and the outlet water temperature can be gradually increased. Gradually reduce, so as to meet the cooling requirements of the unit, and then meet the needs of users, and further enhance the user experience.
- Figure 1 is a flow chart of the control method of the air-cooled magnetic levitation unit of the present invention
- Fig. 2 is a flowchart of an embodiment of the control method of the air-cooled magnetic levitation unit of the present invention.
- the present invention provides an air-cooled magnetic levitation unit.
- the control method and the air-cooled magnetic levitation unit are designed to prevent uneven pressure distribution during the process of switching between single compressor operation mode and dual compressor operation mode, so as to ensure the stability of the unit operation and prevent the water temperature from becoming short. Time fluctuations, so as not to affect the normal use of users, and improve user experience.
- the air-cooled magnetic levitation unit of the present invention includes two compressors.
- the operation modes of the air-cooled magnetic levitation unit include a single compressor operation mode and a dual compressor operation mode.
- the control method of the present invention includes: In the single-compressor operation mode, judge whether the unit meets the preset conditions; if the unit meets the preset conditions, reduce the load of the running compressor, and then turn on the compressor that is not running to switch the unit to dual compressors Operation mode; if the unit does not meet the preset conditions, the unit maintains the single compressor operation mode.
- the preset conditions can include the discharge pressure of the unit, the temperature of the water outlet of the unit, the full-load operating time of the currently operating compressor in the unit, and other parameter conditions, for example, the discharge pressure of the unit and the currently operating compressor
- the full-load operation time of the unit is combined to determine whether the unit is switching from single-compressor operation mode to dual-compressor operation mode.
- Switching from the operating mode to the dual-compressor operating mode can be combined to determine whether the unit is operating from the single-compressor operating mode to the dual-compressor operating mode by combining the unit’s discharge pressure, outlet water temperature, and the full-load operating time of the currently operating compressor.
- Switching of course, to switch from single compressor mode to dual compressor mode, it is necessary to ensure that the compressor that is not running is fault-free.
- Those skilled in the art can flexibly set the specific content of the preset conditions in actual applications, as long as the preset conditions are passed Set the conditions to be able to judge whether the unit is switched from single compressor operation mode to dual compressor operation mode.
- the preset conditions include that the discharge pressure of the unit is less than the preset pressure and lasts for the first preset time, the outlet water temperature of the unit is greater than the preset temperature and lasts for the second preset time, and the full load operation time of the running compressor reaches The third preset time and the compressor that is not running have no faults. It should be noted that if the exhaust pressure is less than the preset pressure, the exhaust pressure of the unit is insufficient at this time, and the outlet water temperature of the unit is greater than the preset temperature, indicating that the outlet water temperature is too high at this time. The first preset time and second preset time are introduced.
- the unit can more accurately determine whether to switch the mode, that is, switch from the single compressor operating mode to the dual compressor operating mode.
- the principle of setting the preset conditions is as follows: First, make the running compressor run at full load and reach the third preset time, that is, the single compressor has reached the maximum load. At this time, the exhaust of the unit that the single compressor can provide The refrigeration capacity of pressure and outlet water temperature has reached the maximum limit.
- the unit can no longer use the single compressor operation mode at this time.
- it should be switched to the dual-compressor operation mode. Under the premise that the other compressor is not faulty, the running compressor is first reduced to run, and then the compressor that is not running is started. The compressor operation mode is switched to the dual-compressor operation mode, thereby increasing the discharge pressure of the unit and the refrigeration capacity of the unit, thereby reducing the outlet water temperature and meeting the refrigeration requirements of the unit.
- the first preset time, the second preset time, the third preset time, the preset pressure and the preset temperature can determine whether the unit needs to be
- the single compressor operation mode can be switched to the dual compressor operation mode.
- the preset pressure is 1.1 MPa
- the preset temperature is (Td+2)°C, where Td is the set value
- the first preset time and the second preset time are both 180 seconds.
- the third preset time is 60 seconds.
- the step of "reducing the load of the running compressor” specifically includes: reducing the running compressor to the minimum load operation.
- the minimum operating load of the compressor can be calculated, so that the unit can be currently running when the unit switches from a single compressor operating mode to a dual compressor operating mode.
- the compressor is reduced to the minimum load operation.
- other formulas can also be used to calculate the minimum load of the compressor.
- the adjustment and change of this application formula does not deviate from the technical solution of the present invention, and should be limited to the protection scope of the present invention within.
- the currently running compressor can also be reduced to other load operations, as long as the load is reduced by the currently running compressor so that the unit will not affect the stability of the unit when switching from single compressor operation mode to dual compressor operation mode. .
- the step of “reducing the load of the running compressor, and then turning on the compressor that is not running” specifically includes: reducing the load of the running compressor to run for a fourth preset time, and then turning on the compressor that is not running Compressor.
- the fourth preset time can be 30 seconds.
- the fourth preset time can also be other times.
- the control method of the present invention further includes: increasing the load of the running compressor. That is, when the unit is switched from the single compressor operation mode to the dual compressor operation mode, the currently running compressor is first reduced to run, and then continued for a period of time, and then the compressor that is not running is turned on and the compressor that has been running before is turned on.
- compressor A and compressor B are used as examples, the compressor A and compressor B are used as examples.
- the compressor A is first reduced in load, and then continues for a period of time. Then when the compressor B is turned on, the compressor is increased in load to ensure the unit Under the premise of stability, the unit is switched from single compressor operation mode to dual compressor operation mode.
- compressor A is running and compressor B is not running. It is judged whether the unit satisfies "discharge pressure Pd ⁇ 1.1MPa for 180s, and the outlet water temperature of the unit>(Td+2)°C and Continue for 180s, the full load operation time of compressor A reaches 60s and compressor B has no fault. If it meets the conditions, then compressor A runs at minimum capacity (that is, runs at minimum load), if not, the unit maintains compressor A The state where compressor B is not running. When compressor A is running at the minimum capacity, judge whether the minimum capacity operation time of compressor A reaches 30s, if it reaches and compressor B starts, compressor A exits the minimum capacity state; if not, compressor A keeps the minimum capacity Ability to operate.
- the air-cooled magnetic levitation unit further includes a controller configured to perform the above-mentioned control method.
- the air-cooled magnetic levitation unit may be a co-cylinder air-cooled magnetic levitation unit, which includes a cylinder The two compressors are installed in the cylinder.
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Abstract
一种风冷磁悬浮机组的控制方法和风冷磁悬浮机组，该风冷磁悬浮机组包括两个压缩机，该控制方法包括：在机组处于单压缩机运行模式时，判断机组是否满足预设条件；如果机组满足预设条件，则使正在运行的压缩机降负荷运行，然后开启未在运行的压缩机，以使机组切换为双压缩机运行模式。该机组在单压缩机运行模式切换双压缩机运行模式的过程中能够避免压力分配不均，保证机组运行的稳定性，且不会使水温出现短时波动，从而不会影响用户的正常使用，提升用户体验。
Description
本发明属于空调机组技术领域，具体提供一种风冷磁悬浮机组的控制方法和风冷磁悬浮机组。
目前，在一些中央空调中装配有风冷磁悬浮机组，部分风冷磁悬浮机组中装配有双压缩机，相较于装配有单压缩机的风冷磁悬浮机组，装配有双压缩机的风冷磁悬浮机组的制冷量调节范围更大，并且在其中一个压缩机发生故障/报警时，另一个压缩机能够保持风冷磁悬浮机组的正常运行。
然而，这种具有双压缩机的风冷磁悬浮机组在单压缩机运行切换双压缩机运行的过程中，如果直接启动未运行的压缩机，会出现压力分配不均，进而导致正在运行的压缩机或者即将启动的压缩机运行不稳定，影响机组的稳定性，如果先关闭正在运行的压缩机然后再同时启动两个压缩机，会导致水温出现非常大的波动，影响用户的正常使用。
因此，本领域需要一种新的风冷磁悬浮机组的控制方法和相应的风冷磁悬浮机组来解决上述问题。
发明内容
为了解决现有技术中的上述问题，即为了解决现有风冷磁悬浮机组在单压缩机运行模式切换双压缩机运行模式的过程中易影响机组的稳定性或者用户的正常使用的问题，本发明提供了一种风冷磁悬浮机组的控制方法，该风冷磁悬浮机组包括两个压缩机，该控制方法包括：在机组处于单压缩机运行模式时，判断机组是否满足预设条件；如果机组满足预设条件，则使正在运行的压缩机降负荷运行，然后开启未在运行的压缩机，以使机组切换为双压缩机运行模式。
在上述控制方法的优选技术方案中，预设条件包括机组的排气压力小于预设压力且持续第一预设时间、机组的出水温度大于预设温 度且持续第二预设时间、正在运行的压缩机的满载运行时间达到第三预设时间和未在运行的压缩机无故障。
在上述控制方法的优选技术方案中，预设压力为1.1兆帕。
在上述控制方法的优选技术方案中，第一预设时间和第二预设时间均为180秒，第三预设时间为60秒。
在上述控制方法的优选技术方案中，“使正在运行的压缩机降负荷运行”的步骤具体包括：使正在运行的压缩机降低到最小负荷运行。
在上述控制方法的优选技术方案中，“使正在运行的压缩机降负荷运行，然后开启未在运行的压缩机”的步骤具体包括：使正在运行的压缩机降负荷运行并持续第四预设时间，然后开启未在运行的压缩机。
在上述控制方法的优选技术方案中，第四预设时间为30秒。
在上述控制方法的优选技术方案中，在“开启未在运行的压缩机”的步骤的同时，控制方法还包括：使正在运行的压缩机升负荷运行。
在另一方面，本发明还提供了一种风冷磁悬浮机组，该机组包括控制器，该控制器配置成能够执行上述的控制方法。
在上述风冷磁悬浮机组的优选技术方案中，机组还包括筒体，两个压缩机均设置于筒体内。
本领域技术人员能够理解的是，在本发明的优选技术方案中，在具有双压缩机的风冷磁悬浮机组由单压缩机运行模式切换为双压缩机运行模式时，先使正在运行的压缩机降负荷运行，然后再启动未运行的压缩机，通过这样的设置，能够避免机组的压力分配不均，尤其是共筒体双压缩机的机组，能够保证筒体内压力平衡，从而保证机组运行的稳定性，且由于机组始终保持运行，不会使水温出现短时波动，从而不会影响用户的正常使用，提升用户体验。
进一步地，通过设定预设条件，使得在机组处于单压缩机运行模式且满足预设条件时，才使机组由单压缩机运行模式切换为双压缩机运行模式，具体而言，当单压缩机的满载持续时间达到很长的时间时，机组排气压力不足，并且出水温度过高，说明此时单压缩机运行已经无 法满足机组的制冷要求，此时应该增开压缩机来提高机组排气压力，降低出水温度，因此在未运行的压缩机无故障的前提下，使其启动，从而提高机组的排气压力，降低出水温度，从而满足机组的制冷要求，进而满足用户的使用需求，提升用户体验。
进一步地，先使正在运行的压缩机以最小的负荷运行，然后再启动未运行的压缩机，通过这样的方式，可以最大程度上地避免机组的压力分配不均，保证机组的稳定性，提高机组的使用寿命。
进一步地，在未运行的压缩机启动之后，使之前已经运行的压缩机升负荷运行，通过这样的设置，既能够保证机组的稳定性，同时能够使机组的排气压力逐渐升高，出水温度逐渐降低，从而满足机组的制冷要求，进而满足用户的使用需求，进一步提升用户体验。
图1是本发明的风冷磁悬浮机组的控制方法的流程图；
图2是本发明的风冷磁悬浮机组的控制方法实施例的流程图。
下面参照附图来描述本发明的优选实施方式。本领域技术人员应当理解的是，这些实施方式仅仅用于解释本发明的技术原理，并非旨在限制本发明的保护范围。
需要说明的是，在本发明的描述中，术语“第一”、“第二”、“第三”、“第四”仅用于描述目的，而不能理解为指示或暗示相对重要性。
基于背景技术指出的现有风冷磁悬浮机组在单压缩机运行模式切换双压缩机运行模式的过程中易影响机组的稳定性或者用户的正常使用的问题，本发明提供了一种风冷磁悬浮机组的控制方法和风冷磁悬浮机组，旨在使机组在单压缩机运行模式切换双压缩机运行模式的过程中避免出现压力分配不均，从而保证机组运行的稳定性，且不会使水温出现短时波动，从而不会影响用户的正常使用，提升用户体验。
本发明的风冷磁悬浮机组包括两个压缩机，该风冷磁悬浮机组的运行模式包括单压缩机运行模式和双压缩机运行模式，如图1所示，本发明的控制方法包括：在机组处于单压缩机运行模式时，判断机组是否满足预设条件；如果机组满足预设条件，则使正在运行的压缩机降负荷运行，然后开启未在运行的压缩机，以使机组切换为双压缩机运行模式；如果机组不满足预设条件，则使机组维持单压缩机运行模式。其中，预设条件可以包括机组的排气压力、机组的出水温度、机组内当前运行的压缩机的满载运行时间以及其他参数条件等，例如，可以通过机组的排气压力和当前运行的压缩机的满载运行时间来组合判断机组是否进行单压缩机运行模式向双压缩机运行模式的切换，还可以通过机组的出水温度和当前运行的压缩机的满载运行时间来组合判断机组是否进行单压缩机运行模式向双压缩机运行模式的切换，又可以通过机组的排气压力、出水温度以及当前运行的压缩机的满载运行时间来组合判断机组是否进行单压缩机运行模式向双压缩机运行模式的切换，当然，进行单压缩机模式向双压缩机模式的切换还得保证未运行的压缩机无故障，本领域技术人员可以在实际应用中灵活地设置预设条件的具体内容，只要通过该预设条件能够判断机组是否由单压缩机运行模式切换为双压缩机运行模式即可。
优选地，预设条件包括机组的排气压力小于预设压力且持续第一预设时间、机组的出水温度大于预设温度且持续第二预设时间、正在运行的压缩机的满载运行时间达到第三预设时间和未在运行的压缩机无故障。需要说明的是，排气压力小于预设压力说明此时机组的排气压力不足，机组的出水温度大于预设温度说明此时出水温度过高，引入第一预设时间和第二预设时间能够避免判断时由于机组波动或者检测偏差而造成的误判，并且引入正在运行的压缩机的满载运行时间可以说明此时正在运行的压缩机已经处于最大负荷工作状态，即已经无法通过这个压缩机来提高机组的排气压力和制冷能力，通过这样的设置，使得机组可以更为准确地判断是否要进行模式的切换，即由单压缩机运行模式切换为双压缩机运行模式，在该实施例中，预设条件的设置原理为：首先要使正在运行的压缩机满载运行且达到第三预设时间，即单压缩机运行已经到最大负荷，此时单压缩机能够提供的机组的排气压力和出水温度 的制冷能力已经到最大极限，如果此时机组的排气压力仍然达不到预设压力且出水温度仍然达不到预设温度，说明此时机组采用单压缩机运行模式已经无法满足制冷要求，应该切换为双压缩机运行模式，在另一个压缩机无故障的前提下，先使正在运行的压缩机降负荷运行，然后再启动未在运行的压缩机，从而使机组由单压缩机运行模式切换为双压缩机运行模式，从而提高机组的排气压力和机组的制冷能力，从而降低出水温度，满足机组的制冷要求。
需要说明的是，上述中，本领域技术人员可以在实际应用中灵活地设置第一预设时间、第二预设时间、第三预设时间、预设压力和预设温度的具体数值，只要通过第一预设时间、第二预设时间和第三预设时间确定的时间分界点、预设压力确认的排气压力分界点以及预设温度确定的出水温度分界点能够判定机组是否需要由单压缩机运行模式切换为双压缩机运行模式即可。在一种可能的情形中，预设压力为1.1MPa，预设温度为(Td+2)℃，其中，Td为设定值，第一预设时间和第二预设时间均为180秒，第三预设时间为60秒。
优选地，“使正在运行的压缩机降负荷运行”的步骤具体包括：使正在运行的压缩机降低到最小负荷运行。其中，压缩机的最小负荷可以通过下述公式CompRequireLoad＝CompActualLoad+(CompChoke Speed—CompActualSpeed)×K2+20)，其中，CompRequireLoad为压缩机需求负荷，CompActualLoad为压缩机实际负荷，CompChokeSpeed为压缩机喘振转速，CompActualSpeed为压缩机实际转速，K2为系数，通过这个公式，可以计算得出压缩机的最小运行负荷，使得机组在进行单压缩机运行模式向双压缩机运行模式切换时，可以使当前正在运行的压缩机降低到最小负荷运行，当然，还可以通过其他公式来计算压缩机的最小负荷，这种应用公式的调整和改变并不偏离本发明的技术方案，均应限定在本发明的保护范围之内。此外，当前运行的压缩机还可以降低到其他负荷运行，只要通过当前运行的压缩机降低负荷使得机组在进行单压缩机运行模式向双压缩机运行模式切换时不会影响机组的稳定性即可。
优选地，“使正在运行的压缩机降负荷运行，然后开启未在运行的压缩机”的步骤具体包括：使正在运行的压缩机降负荷运行并持 续第四预设时间，然后开启未在运行的压缩机。通过这样的设置，即在机组由单压缩机运行模式切换双压缩机运行模式的过程中，先使当前运行的压缩机降负荷运行并维持一段时间，使机组充分稳定，然后再开启另一个未在运行的压缩机，从而保证机组始终稳定可靠运行。其中，第四预设时间可以为30秒，当然，第四预设时间还可以为其他时间，本领域技术人员可以在实际应用中灵活地设置第四预设时间的具体数值，只要通过第四预设时间确定的时间分界点能够判定未在运行的压缩机的开启时间即可。
优选地，在“开启未在运行的压缩机”的步骤的同时，本发明的控制方法还包括：使正在运行的压缩机升负荷运行。即在机组由单压缩机运行模式切换双压缩机运行模式的过程中，先使当前运行的压缩机降负荷运行，然后持续一段时间，然后开启未在运行的压缩机并使之前已经运行的压缩机升负荷运行，以压缩机A和压缩机B为例，先使压缩机A降负荷运行，然后持续一段时间，然后在开启压缩机B的同时，使压缩机升负荷运行，进而在保证机组稳定性的前提下，使机组由单压缩机运行模式切换为双压缩机运行模式。
下面结合一个具体的实施例来阐述本发明的优选技术方案。
如图2所示，在机组启动后，压缩机A运行，压缩机B不运行，判断机组是否满足“排气压力Pd＜1.1MPa并持续180s，机组的出水温度＞(Td+2)℃并持续180s，压缩机A的满载运行时间达到60s以及压缩机B无故障”的条件，若满足，则压缩机A以最小能力运转(即最小负荷运行)，若不满足，则机组维持压缩机A运行压缩机B不运行的状态。在压缩机A以最小能力运转时，判断压缩机A的最小能力运转时间是否达到30s，如果达到，且压缩机B启动，压缩机A退出最小能力状态；如果未达到，则压缩机A保持最小能力运转。
此外，在本发明中，风冷磁悬浮机组还包括控制器，该控制器配置成能够执行上述的控制方法，此外，该风冷磁悬浮机组可以为共筒体风冷磁悬浮机组，这种机组包括筒体，并且两个压缩机都设置于筒体内。
至此，已经结合附图所示的优选实施方式描述了本发明的技术方案，但是，本领域技术人员容易理解的是，本发明的保护范围显然 不局限于这些具体实施方式。在不偏离本发明的原理的前提下，本领域技术人员可以对相关技术特征作出等同的更改或替换，这些更改或替换之后的技术方案都将落入本发明的保护范围之内。
Claims (10)
- 一种风冷磁悬浮机组的控制方法，所述风冷磁悬浮机组包括两个压缩机，其特征在于，所述控制方法包括：在所述机组处于单压缩机运行模式时，判断所述机组是否满足预设条件；如果所述机组满足所述预设条件，则使正在运行的压缩机降负荷运行，然后开启未在运行的压缩机，以使所述机组切换为双压缩机运行模式。
- 根据权利要求1所述的控制方法，其特征在于，所述预设条件包括所述机组的排气压力小于预设压力且持续第一预设时间、所述机组的出水温度大于预设温度且持续第二预设时间、正在运行的压缩机的满载运行时间达到第三预设时间和未在运行的压缩机无故障。
- 根据权利要求2所述的控制方法，其特征在于，所述预设压力为1.1兆帕。
- 根据权利要求2所述的控制方法，其特征在于，所述第一预设时间和所述第二预设时间均为180秒，所述第三预设时间为60秒。
- 根据权利要求1所述的控制方法，其特征在于，“使正在运行的压缩机降负荷运行”的步骤具体包括：使正在运行的压缩机降低到最小负荷运行。
- 根据权利要求1所述的控制方法，其特征在于，“使正在运行的压缩机降负荷运行，然后开启未在运行的压缩机”的步骤具体包括：使正在运行的压缩机降负荷运行并持续第四预设时间，然后开启未在运行的压缩机。
- 根据权利要求6所述的控制方法，其特征在于，所述第四预设时 间为30秒。
- 根据权利要求6所述的控制方法，其特征在于，在“开启未在运行的压缩机”的步骤的同时，所述控制方法还包括：使正在运行的压缩机升负荷运行。
- 一种风冷磁悬浮机组，所述机组包括控制器，其特征在于，所述控制器配置成能够执行权利要求1至8中任一项所述的控制方法。
- 根据权利要求9所述的风冷磁悬浮机组，其特征在于，所述机组还包括筒体，所述两个压缩机均设置于所述筒体内。
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