WO2020056955A1 - 风冷冷水机组制冷系统及其启动控制方法 - Google Patents

风冷冷水机组制冷系统及其启动控制方法 Download PDF

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Publication number
WO2020056955A1
WO2020056955A1 PCT/CN2018/121919 CN2018121919W WO2020056955A1 WO 2020056955 A1 WO2020056955 A1 WO 2020056955A1 CN 2018121919 W CN2018121919 W CN 2018121919W WO 2020056955 A1 WO2020056955 A1 WO 2020056955A1
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Prior art keywords
pressure
refrigeration system
evaporator
air
refrigerant
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PCT/CN2018/121919
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English (en)
French (fr)
Inventor
刘思源
程琦
陈培生
黄凯亮
钟海玲
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • 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
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers

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  • the present application relates to the field of air conditioning technology, and in particular, to a refrigeration system of an air-cooled chiller and a startup control method thereof.
  • the air-cooled chiller is mostly used outdoors. After long-term storage, there is a possibility that the refrigerant may migrate in the system due to large environmental temperature changes. Refrigerant is transferred from the system pipeline to a condenser with a larger volume for storage, which leads to low-pressure protection due to insufficient low-side refrigerant volume during the refrigeration start-up process after the unit is placed. The unit cannot start normally, which will cause the unit to malfunction and reduce user comfort.
  • the present application discloses a refrigeration system of an air-cooled chiller and a startup control method thereof.
  • the purpose of this application is to address the problem of low-pressure protection that occurs in a refrigeration system of an air-cooled chiller unit due to a change in ambient temperature due to a change in ambient temperature, resulting in low-pressure protection after refrigeration for a long period of time.
  • Chiller refrigeration system and its start-up control method are examples of the present application.
  • An air-cooled chiller refrigeration system startup control method includes the following steps:
  • Control the cooling system of the air-cooled chiller to turn on and place the cooling start process detect the actual low-pressure pressure P on the low-pressure side of the chiller's refrigeration system every time t1, and the actual low-pressure pressure detected in continuous time T1 is Px, and T1 ⁇ t1, x ⁇ 1;
  • the suction side of the compressor is controlled to only draw refrigerant from the evaporator or simultaneously draw refrigerant from the evaporator and the condenser.
  • the step of controlling the suction side of the compressor to only draw refrigerant from the evaporator or simultaneously draw refrigerant from the evaporator and the condenser by comparing the actual low-pressure pressure Px with the placement allowable pressure Pz. include:
  • the steps also include:
  • the steps also include:
  • the T1 ⁇ N ⁇ t1, N ⁇ 1, and the actual low-pressure pressure Px in the continuous time T1 includes N detection results Px1, Px2, ..., PxN;
  • the Pz 250 kpa.
  • the Pr 300 kpa.
  • the step of controlling the chiller refrigeration system to turn on the refrigeration start-up process includes:
  • the T 2 days.
  • the duration of the placement refrigeration start process is T2, and after the duration of the placement refrigeration start process T2 expires, the compressor suction side only draws refrigerant from the evaporator.
  • the T2 3min.
  • An air-cooled chiller refrigeration system includes a compressor, a condenser, an evaporator, and a liquid return pipe.
  • the liquid return pipe is arranged in parallel with the evaporator, and the liquid return pipe is provided with a liquid return pipe switch. valve.
  • the air-cooled chiller refrigeration system startup control method of the present application sets the allowable pressure on the low-pressure side of the air-cooled chiller refrigeration system to be Pz, and the main board controls the air-cooled chiller refrigeration system to turn on and place the refrigeration to start the process, which is detected every t1
  • the actual low-pressure pressure P on the low-pressure side of the chiller refrigeration system, the actual low-pressure pressure detected during the continuous time T1 is Px, and T1 ⁇ t1, x ⁇ 1.
  • the suction side of the compressor is controlled to only draw refrigerant from the evaporator or simultaneously draw refrigerant from the evaporator and the condenser.
  • FIG. 1 is a schematic flowchart of a control method for a refrigeration system startup control method of an air-cooled chiller according to an embodiment of the present application
  • FIG. 2 is a schematic diagram of a refrigeration system of an air-cooled chiller according to an embodiment of the present application.
  • an embodiment of the present application provides a method for controlling startup of an air-cooled chiller refrigeration system, including the following steps:
  • the allowable placement pressure Pz indicates the minimum allowable pressure during placement.
  • the actual low-pressure pressure P on the low-pressure side of the chiller refrigeration system is lower than this value, which is likely to cause unit failure. In order to avoid unit shutdown, the actual low-pressure pressure P on the low-pressure side of the chiller refrigeration system needs to be maintained above this value.
  • the low-pressure side of the air-cooled chiller refrigeration system during cooling mainly refers to an evaporator or a vapor separator or a compressor suction pipe, and here refers to a compressor suction port pressure.
  • the Pz 250kpa.
  • the main board controls the chiller refrigeration system to turn on and place the cooling start process, and detects the actual low-pressure pressure P on the low-pressure side of the chiller refrigeration system every time t1, and the actual low-pressure pressure detected in continuous time T1 is Px, and T1 ⁇ t1 , X ⁇ 1.
  • the time interval t1 can be set, and can be selected to be longer, such as to be detected every 5s, or shorter, such as to be detected every 1s.
  • the setting of the specific time interval t1 is determined according to the data transmission rate and the calculation rate of the motherboard. However, it should not be too long. According to the actual situation such as the data transmission rate, the appropriate time is 3 seconds.
  • the continuous time T1 can be set, and the T1 can be set to be larger or smaller.
  • the number of times of actual detection Px within the continuous time T1 can be set, that is, Px may be a certain value or some values.
  • Px may be a certain value or some values.
  • T1 T1
  • Px only one time is detected in continuous time T1
  • Px is a value.
  • the main board controls the compressor suction end only
  • the refrigerant is drawn from the evaporator or from both the evaporator and the condenser. In order to ensure that there is no low-voltage protection during the continuous time T1 and a period of time thereafter, reduce unit failures and improve user comfort.
  • the mainboard controls the suction side of the compressor to only draw the refrigerant from the evaporator or the refrigerant from the evaporator and the condenser at the same time by adding one to the refrigeration system of the air-cooled chiller
  • a liquid return line 400 is provided in parallel with the evaporator 300, and the liquid return line 400 is provided with a liquid return pipe switching valve 410.
  • the main board controls the return pipe switching valve 410 to be opened, the main board sends a signal to the return pipe switch valve 410 to “open”, the return pipe switch valve 410 is opened, and the compressor 100 is pumped from the return pipe 400 and the evaporator 300 together. Refrigerant.
  • the main board controls the liquid return pipe switch valve 410 to be closed, a signal sent by the main board to the liquid return pipe switch valve 410 is “closed”, the liquid return pipe switch valve 410 is closed, and the compressor 100 only draws refrigerant from the evaporator 300.
  • the compressor suction side is controlled to only draw refrigerant from the evaporator or from the evaporator and condensate at the same time.
  • the steps of pumping refrigerant in the device include:
  • the compressor suction side draws refrigerant from the evaporator and condenser at the same time.
  • the actual low-pressure pressure detected during the continuous time T1 is Px, and Px is one or more values. If the Px is less than Pz, the main board controls the suction side of the compressor from the evaporator and the condenser at the same time.
  • Pump refrigerant Referring to FIG. 2, optionally, the refrigerating system of the air-cooled chiller is provided with a liquid return line 400, and the liquid return line 400 is provided in parallel with the evaporator 300, and the liquid return line 400 is provided with Return pipe switching valve 410.
  • the main board controls the return pipe switching valve 410 to open, the main board sends a signal to the return pipe switching valve 410 to "open", the return pipe switching valve 410 opens, and the compressor 100 starts from the return pipe.
  • the circuit 400 and the evaporator 300 pump refrigerant together.
  • the actual low-pressure pressure Px detected during the continuous time T1 is less than the allowable placement pressure Pz, which proves that the low-pressure pressure P is below the allowable placement pressure Pz and continued for a period of time, and did not rise to a safe range during the T1 period.
  • the actual low-pressure pressure Px is less than the placement allowable pressure Pz during one or more detections in continuous time T1, which indicates that the detection is less than the entire time period t2.
  • T1 9s
  • t1 3 seconds
  • the actual low pressure detected three times in 9s is Px1, Px2, and Px3 are less than the allowable pressure Pz, indicating that the actual low pressure is P within 9 seconds for the three times of detection. Less than the allowable pressure Pz.
  • the actual low pressure in 9s is at least Px1, Px2 and Px3 and Px4, and the actual low pressure detected in four consecutive times in 9s is Px1, Px2 , Px3, and Px4 are all less than the allowable pressure Pz for placement, indicating that the actual low pressure pressure P is less than the allowable pressure for placement Pz for the entire time period of four tests.
  • the actual low-pressure pressure P is already in a state that needs protection.
  • the main board signals the return valve switch valve 410 to "open", the return valve switch valve 410 is opened, and the compressor 100 starts from the return line. 400 and evaporator 300 pump refrigerant together to increase the pressure value to a safe range to avoid low pressure protection.
  • the compressor suction side is controlled to only draw refrigerant from the evaporator or at the same time.
  • the steps of pumping refrigerant from the evaporator and condenser include:
  • the recovery pressure on the low-pressure side of the chiller refrigeration system is set to Pr, Pr> Pz.
  • the placement recovery pressure Pr indicates that during the placement refrigeration start-up, through some measures, the lower pressure value that would have caused the unit to fail has risen to a safe range, and will not be reduced again to the pressure range that will protect the unit in the short term.
  • the Pr 300kpa.
  • the way of drawing the refrigerant on the suction side of the compressor is the same as the way of drawing the refrigerant on the suction side of the compressor at the starting point of the continuous time T1. Specifically, it means that if the compressor only draws the refrigerant from the evaporator during the first detection within the continuous time T1, whether the compressor is kept from the evaporator or the refrigerant is only drawn from the evaporator. If during the first test within continuous time T1, if the compressor draws refrigerant from both the evaporator and the condenser at the same time, will the compressor still be drawn from the evaporator and the condenser at the same time. Specifically, Px is a value or multiple values.
  • the state of the main board controlling the liquid return valve 410 and the main board within a continuous time T1 The state of the return pipe switching valve 410 is the same at the first detection.
  • the liquid return on / off valve 410 maintains the original state means that the liquid return on / off valve 410 is closed when the main board detects for the first time in continuous time T1, then the on / off valve does not operate and is still closed; otherwise, it does not operate and remains open.
  • the low-pressure pressure P on the low-pressure side of the chiller refrigeration system will not be less than the allowable pressure Pz, and the chiller refrigeration system will not have low-pressure protection.
  • the main board sends a “close” signal to the return pipe switching valve 410, the return pipe switching valve 410 is closed, and 100 compressors are used.
  • the refrigerant is drawn from the evaporator 300.
  • the low-pressure pressure P on the low-pressure side of the chiller refrigeration system will not be less than the allowable pressure Pz, and the chiller refrigeration system will not have low-pressure protection.
  • the T1 ⁇ N ⁇ t1, N ⁇ 1, and the actual low-pressure pressure Px in the continuous time T1 includes the detection results N times Px1, Px2, etc. PxN. ;
  • the t2 3s
  • the T2 9s
  • the actual low pressure Px in the continuous time T1 includes three detection results Px1, Px2, and Px3. The following situations may occur:
  • the main board controls the return pipe switching valve 410 to be opened, the main board sends a signal to the return pipe switch valve 410 to “open”, the return pipe switch valve 410 is opened, and the compressor 100 is pumped from the return pipe 400 and the evaporator 300 together. Refrigerant.
  • the state of the return pipe switching valve 410 controlled by the main board is the same as the state of the return pipe switching valve 410 when the main board detects for the first time in the continuous time T1.
  • the liquid return on / off valve 410 maintains the original state means that the liquid return on / off valve 410 is closed when the main board detects for the first time in continuous time T1, then the on / off valve does not operate and is still closed; otherwise, it does not operate and remains open.
  • the low-pressure pressure P on the low-pressure side of the chiller refrigeration system will not be less than the allowable pressure Pz, and the chiller refrigeration system will not have low-pressure protection.
  • the main board sends a "close" signal to the return pipe switching valve 410, the return pipe switching valve 410 is closed, and the compressor 100 only draws refrigerant from the evaporator 300. At this time, the low-pressure pressure P on the low-pressure side of the chiller refrigeration system will not be less than the allowable pressure Pz, and the chiller refrigeration system will not have low-pressure protection.
  • the step of the main board determining that the chiller refrigeration system has entered a refrigeration start-up process includes:
  • the main board detects the time interval t between the start time of the unit and the last time of the last operation. Compare the relationship between t and T to determine the cooling start mode of the unit. If t ⁇ T, the unit starts to enter the normal cooling start mode; if t ⁇ T, the unit starts to enter the cooling start mode.
  • the duration of the refrigeration start-up process is T2.
  • T2 After the duration of the refrigeration start-up process T2 expires, the suction end of the compressor is only drawn from the evaporator. Refrigerant.
  • T2 of the placing refrigeration start process expires, the return valve switching valve is closed, and the placing refrigeration start process is closed.
  • the return pipe switching valve action determination logic is only during the placement refrigeration startup process, and its role is also to increase the low pressure during the placement refrigeration startup process. Pressure, so when the unit runs out of this condition, the on-off valve needs to be closed together with the placement cooling mode to enter the normal cooling mode.
  • a refrigeration system of an air-cooled chiller includes a compressor 100, a condenser 200, an evaporator 300, and a liquid return pipe 400.
  • the liquid return pipe 400 is provided in parallel with the evaporator 300, and the liquid return pipe 400 is provided with a liquid return pipe switching valve 410.
  • the on-off valve 410 is a solenoid valve.
  • the liquid pipe on-off valve 410 is opened, and the compressor 100 draws refrigerant from the liquid return pipe 400 and the evaporator 300 to increase the pressure value to a safe range to avoid low-pressure protection.
  • the main board detects that the actual low-pressure pressure on the low-pressure side of the chiller refrigeration system is greater than the allowable pressure Pz on the low-pressure side of the air-cooled chiller refrigeration system, and then controls the return pipe switch valve 410 to close, and the compressor 100 draws refrigerant from the evaporator 300. Keep the pressure value in a safe range to avoid low pressure protection.
  • the air-cooled chiller refrigeration system startup control method of the present application sets the allowable pressure on the low-pressure side of the air-cooled chiller refrigeration system to be Pz, and the main board controls the air-cooled chiller refrigeration system to turn on and place the refrigeration to start the process, which is detected every time t1
  • the actual low-pressure pressure P on the low-pressure side of the chiller refrigeration system, the actual low-pressure pressure detected during the continuous time T1 is Px, and T1 ⁇ t1, x ⁇ 1.
  • the suction side of the compressor is controlled to only draw refrigerant from the evaporator or simultaneously draw refrigerant from the evaporator and the condenser.

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Abstract

一种风冷冷水机组制冷系统启动控制方法以及制冷系统，所述控制方法包括：设定风冷冷水机组制冷系统低压侧的放置允许压力为Pz，控制风冷冷水机组制冷系统开启放置制冷启动过程，每隔时间t1检测一次冷水机组制冷系统低压侧的实际低压压力P，连续时间T1内检测的所述实际低压压力为Px，且T1≥t1，x≥1; 通过将实际低压压力Px与所述放置允许压力Pz比较，控制压缩机(100)吸气端只从蒸发器(300)中抽冷媒或同时从蒸发器(300)以及冷凝器(200)中抽冷媒;可以避免风冷冷水机组制冷系统启动时发生低压保护，减少机组故障，提高用户舒适性。

Description

风冷冷水机组制冷系统及其启动控制方法
相关申请
本申请要求2018年09月19日申请的，申请号为201811093452.3，名称为“风冷冷水机组制冷系统及其启动控制方法”的中国专利申请的优先权，在此将其全文引入作为参考。
技术领域
本申请涉及空调技术领域，特别是涉及一种风冷冷水机组制冷系统及其启动控制方法。
背景技术
风冷冷水机组使用环境多为室外，长期放置后，存在因环境温度变化大，导致系统中冷媒迁移的可能。冷媒由系统管路中迁往容积较大的冷凝器中储存，进而导致机组在放置后制冷启动过程中由于低压侧冷媒量不足而发生低压保护。机组不能正常启动，进而引发机组故障以及降低用户舒适性。
发明内容
有鉴于此，本申请公开一种风冷冷水机组制冷系统及其启动控制方法。本申请的目的在于针对风冷冷水机组制冷系统因环境温度变化引起冷媒迁移导致长期放置后制冷启动发生低压保护的问题，提供一种能够避免低压保护，减少机组故障，提高用户舒适性的风冷冷水机组制冷系统及其启动控制方法。
一种风冷冷水机组制冷系统启动控制方法，包括以下步骤：
设定风冷冷水机组制冷系统低压侧的放置允许压力为Pz；
控制风冷冷水机组制冷系统开启放置制冷启动过程，每隔时间t1检测一次冷水机组制冷系统低压侧的实际低压压力P，连续时间T1内检测的所述实际低压压力为Px，且T1≥t1，x≥1；
通过将所述实际低压压力Px与所述放置允许压力Pz比较，控制压缩机吸气端只从蒸发器中抽冷媒或同时从蒸发器以及冷凝器中抽冷媒。
在其中一个实施例中，所述通过将实际低压压力Px与所述放置允许压力Pz比较，控制压缩机吸气端只从蒸发器中抽冷媒或同时从蒸发器以及冷凝器中抽冷媒的步骤包括：
若Px＜Pz，则压缩机吸气端同时从蒸发器以及冷凝器中抽冷媒。
在其中一个实施例中，所述通过将所述实际低压压力Px与所述放置允许压力Pz比较，控制压缩机吸气端只从蒸发器中抽冷媒或同时从蒸发器以及冷凝器中抽冷媒的步骤还包括：
设定所述冷水机组制冷系统低压侧的恢复压力为Pr，Pr＞Pz；
若Pz≤Px≤Pr，则压缩机吸气端抽冷媒的途径与所述连续时间T1的起始点时刻压缩机吸气端抽冷媒的途径相同。
在其中一个实施例中，所述通过将所述实际低压压力Px与所述放置允许压力Pz比较，控制压缩机吸气端只从蒸发器中抽冷媒或同时从蒸发器以及冷凝器中抽冷媒的步骤还包括：
若Px＞Pr，则压缩机吸气端只从蒸发器中抽冷媒。
在其中一个实施例中，所述T1≥N×t1，N≥1，所述连续时间T1内所述实际低压压力Px包括N次检测结果Px1、Px2…PxN；
只有所述Px1、Px2…PxN均小于Pz,则压缩机吸气端同时从蒸发器以及冷凝器中抽冷媒；
或者
只有所述Px1、Px2…PxN均大于等于Pz，且所述Px1、Px2…PxN均小于等于Pr，则压缩机吸气端抽冷媒的途径与所述连续时间T1的起始点时刻压缩机吸气端抽冷媒的途径相同；
或者
只有所述Px1、Px2…PxN均大于Pz，则压缩机吸气端只从蒸发器中抽冷媒。
在其中一个实施例中，所述Pz＝250kpa。
在其中一个实施例中，所述Pr＝300kpa。
在其中一个实施例中，所述放置制冷启动过程的持续时间为t1，t1＝3min。
在其中一个实施例中，所述控制所述冷水机组制冷系统开启放置制冷启动过程的步骤包括：
设定风冷冷水机组制冷系统从上一次关机到此次开机之间允许的最大时间间隔为T；
检测风冷冷水机组制冷系统此次启动时刻与上一次最后运行时刻之间的时间间隔t；
若t≧T，则控制所述冷水机组制冷系统开启放置制冷启动过程。
在其中一个实施例中，所述T＝2天。
在其中一个实施例中，所述放置制冷启动过程的持续时间为T2，所述放置制冷启动过 程的持续时间T2届满后，则压缩机吸气端只从蒸发器中抽冷媒。
在其中一个实施例中，所述T2＝3min。
一种风冷冷水机组制冷系统，包括压缩机、冷凝器、蒸发器以及回液管路，所述回液管路与所述蒸发器并联设置，所述回液管路上设置有回液管开关阀。
本申请的有益效果是：
本申请的风冷冷水机组制冷系统启动控制方法，设定风冷冷水机组制冷系统低压侧的放置允许压力为Pz，主板控制风冷冷水机组制冷系统开启放置制冷启动过程，每隔时间t1检测一次冷水机组制冷系统低压侧的实际低压压力P，连续时间T1内检测的所述实际低压压力为Px，且T1≥t1，x≥1。通过将实际低压压力Px与所述放置允许压力Pz比较，控制压缩机吸气端只从蒸发器中抽冷媒或同时从蒸发器以及冷凝器中抽冷媒。控制压缩机吸气端同时从蒸发器以及冷凝器中抽冷媒时，将由于环境温度变化导致迁往冷凝器中的冷媒不经过蒸发器而直接抽到压缩机的吸气口中，从而避免风冷冷水机组制冷系统启动时发生低压保护。采用上述控制方法可以避免风冷冷水机组制冷系统启动时发生低压保护，减少机组故障，提高用户舒适性。
附图说明
构成本申请的一部分的附图用来提供对本申请的进一步理解，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据公开的附图获得其他的附图。
图1为本申请实施例公开的风冷冷水机组制冷系统启动控制方法的控制流程示意图；
图2为本申请实施例公开的风冷冷水机组制冷系统的示意图。
附图标记说明：
压缩机            100
冷凝器            200
蒸发器            300
回液管路          400
回液管开关阀      410
具体实施方式
为了使本申请的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。下面对具体实施方式的描述仅仅是示范性的，应当理解，此处所描述的具体实施仅仅用以解释本申请，而绝不是对本申请及其应用或用法的限制。
需要说明的是，当元件被称为“固定于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。相反，当元件被称作“直接在”另一元件“上”时，不存在中间元件。相反，当元件被称作“直接”与另一元件连接时，不存在中间元件。本文所使用的术语“垂直的”、“水平的”、“左”、“右”以及类似的表述只是为了说明的目的。
在本申请的描述中，需要理解的是，术语“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。
请参阅图1，本申请的一个实施例提供一种风冷冷水机组制冷系统启动控制方法，包括以下步骤：
设定风冷冷水机组制冷系统低压侧的放置允许压力Pz。放置允许压力Pz表示的是放置时允许压力最低值，冷水机组制冷系统低压侧的实际低压压力P比该值低了以后容易引发机组故障。为避免机组故障停机，故需要将冷水机组制冷系统低压侧的实际低压压力P维持在该值以上。可选地，所述风冷冷水机组制冷系统制冷时低压侧主要是指蒸发器或汽分或压缩机吸气管，此处指的是压缩机吸气口压力。可选地，所述Pz＝250kpa。
主板控制所述冷水机组制冷系统开启放置制冷启动过程，每隔时间t1检测一次冷水机组制冷系统低压侧的实际低压压力P，连续时间T1内检测的所述实际低压压力为Px，且T1≥t1，x≥1。时间间隔t1可以设定，可以选择长一点比如每隔5s检测一次，也可以选择短一点比如每隔1s检测一次。具体时间间隔t1的设定，根据数据传输速率和主板计算速率来确定。但不宜过长，根据数据传输速率等实际情况较适宜时间为3秒。连续时间T1可以设定，可以将T1设定的大一些或者小一些，考虑到对检测准确性的影响和判断，根据实际数据T1设定为10秒左右较为合适。由上可知，连续时间T1内实际检测的次数Px是可以设定的，也就是说Px可能是某一个值，也可能是某几个值。比如，当t1＝T1时，连续时间T1内只检测了一次，即Px为一个值。当T1＞t1时，连续时间T1内至少检测检 测了一次，即Px为多个值。更具体地，若设定T1＝6s，t1＝3s，则连续时间6s内主板实际进行了3次检测，Px包括三个具体值Px1、Px2、和Px3。
通过将所述实际低压压力Px与所述放置允许压力Pz比较，具体地，将Px包括的至少一个具体数值分别与所述放置允许压力Pz逐一比较，根据比较结果主板控制压缩机吸气端只从蒸发器中抽冷媒或同时从蒸发器以及冷凝器中抽冷媒。以保证在连续时间T1内以及之后的一段时间内不会出现低压保护，减少机组故障，提高用户舒适性。
可选地，请参阅图2，主板控制压缩机吸气端只从蒸发器中抽冷媒或同时从蒸发器以及冷凝器中抽冷媒通过以下手段实现的：在风冷冷水机组制冷系统中添加一条回液管路400，所述回液管路400与所述蒸发器300并联设置，所述回液管路400上设置有回液管开关阀410。主板控制所述回液管开关阀410打开，主板发送给回液管开关阀410“开”的信号，回液管开关阀410打开，压缩机100从回液管路400和蒸发器300一起抽冷媒。主板控制所述回液管开关阀410关闭，主板发送给回液管开关阀410“关”的信号，回液管开关阀410关闭，压缩机100只是从所述蒸发器300中抽冷媒。
请继续参见图1，在其中一个实施例中，所述通过将实际低压压力Px与所述放置允许压力Pz比较，控制压缩机吸气端只从蒸发器中抽冷媒或同时从蒸发器以及冷凝器中抽冷媒的步骤包括：
若Px＜Pz，则压缩机吸气端同时从蒸发器以及冷凝器中抽冷媒。在所述连续时间T1内检测的所述实际低压压力为Px，Px为一个值或者多个值，若所述Px均小于Pz，则主板控制压缩机吸气端同时从蒸发器以及冷凝器中抽冷媒。请参阅图2，可选地，风冷冷水机组制冷系统设置了回液管路400，所述回液管路,400与所述蒸发器300并联设置，所述回液管路400上设置有回液管开关阀410。若所述Px均小于Pz，主板控制所述回液管开关阀410打开，主板发送给回液管开关阀410“开”的信号，回液管开关阀410打开，压缩机100从回液管路400和蒸发器300一起抽冷媒。连续时间T1内检测到的实际低压压力Px均小于放置允许压力Pz，证明低压压力P处于放置允许压力Pz值以下且延续了一段时间，且在T1段时间段内未升到安全范围。具体地，在连续时间T1内一次或者多次检测中实际低压压力为Px都小于放置允许压力Pz，就能说明检测的整个时间段t2内都是小于的。比如T1＝9s，t1＝3秒，9s内连续三次检测到的实际低压压力为Px1、Px2和Px3都小于放置允许压力Pz，表明三次检测的整个时间段9秒内都是实际低压压力为P小于放置允许压力Pz。当然，连续的T1＝9s时间段内，若时间间隔t1＝2s，则9s内实际低压压力至少为Px1、Px2和、Px3和Px4，9s内连续四次检测到的实际低压压力为Px1、Px2、Px3和Px4都小于放置允许压力Pz，表明进行了四次检测的整个时间段9秒内都是实际低压压力 为P小于放置允许压力Pz。此时实际低压压力P已处于需要保护的状态，为保证机组不故障停机，主板给回液管开关阀410“开”的信号，回液管开关阀410打开，压缩机100从回液管路400和蒸发器300一起抽冷媒，将压力值上升到安全范围，避免出现低压保护。
请继续参见图1和图2，在其中一个实施例中，所述通过将所述实际低压压力Px与所述放置允许压力Pz比较，控制压缩机吸气端只从蒸发器中抽冷媒或同时从蒸发器以及冷凝器中抽冷媒的步骤还包括：
设定所述冷水机组制冷系统低压侧的恢复压力为Pr，Pr＞Pz。放置恢复压力Pr表示在放置制冷启动过程中，通过一些措施使得原本将要使机组发生故障的较低压力值上升到安全范围内，短期不会再次降低到将要使机组保护的压力范围。可选地，所述Pr＝300kpa。
若Pz≤Px≤Pr，则压缩机吸气端抽冷媒的途径与所述连续时间T1起始点时刻压缩机吸气端抽冷媒的途径相同。具体地是指在连续时间T1内第一次检测时，如果压缩机只从蒸发器中抽冷媒，则保持压缩机还是只从蒸发器中抽冷媒。如果在连续时间T1内第一次检测时，如果压缩机同时从蒸发器和冷凝器中抽冷媒，则保持压缩机还是同时从蒸发器和冷凝器中抽冷媒。具体地，Px为一个值或多个值，若所述Px均大于等于Pz，且所述Px均小于等于Pr，则主板控制回液管开关阀410的状态与所述主板在连续时间T1内第一次检测时回液管开关阀410的状态相同。回液开关阀410保持原来的状态指主板在连续时间T1内第一次检测时时回液开关阀410是关闭，则开关阀不动作，仍是关闭；反之，则不动作，保持开启。此时，所述冷水机组制冷系统低压侧的低压压力P不会小于放置允许压力Pz，所述冷水机组制冷系统不会出现低压保护。
请继续参见图1和图2，在其中一个实施例中，若所述Px大于Pr，主板发出“关”的信号给回液管开关阀410，回液管开关阀410关闭，压缩机100只从蒸发器300中抽冷媒。此时，所述冷水机组制冷系统低压侧的低压压力P不会小于放置允许压力Pz，所述冷水机组制冷系统不会出现低压保护。
请继续参见图1和图2，在其中一个实施例中，所述T1≥N×t1，N≥1，所述连续时间T1内所述实际低压压力Px包括N次检测结果Px1、Px2…PxN；
只有所述Px1、Px2…PxN均小于Pz,则压缩机吸气端同时从蒸发器以及冷凝器中抽冷媒。
或者
只有所述Px1、Px2…PxN均大于等于Pz，且所述Px1、Px2…PxN均小于等于Pr，则压缩机吸气端抽冷媒的途径与所述连续时间T1的起始点时刻压缩机吸气端抽冷媒的途径相同。
或者
只有所述Px1、Px2…PxN均大于Pz，则压缩机吸气端只从蒸发器中抽冷媒。
具体地，所述t2＝3s，所述T2＝9s，所述连续时间T1内所述实际低压压力Px包括三次检测结果Px1、Px2和Px3。可能出现以下情形：
只有所述Px1、Px2和Px3均小于等于Pz，才有Px＜Pz。主板控制所述回液管开关阀410打开，主板发送给回液管开关阀410“开”的信号，回液管开关阀410打开，压缩机100从回液管路400和蒸发器300一起抽冷媒。
或者
只有所述Px1、Px2和Px3均大于等于Pz，且所述Px1、Px2和Px3均小于等于Pr，才有Pz≤Px≤Pr。则主板控制回液管开关阀410的状态与所述主板在连续时间T1内第一次检测时回液管开关阀410的状态相同。回液开关阀410保持原来的状态指主板在连续时间T1内第一次检测时时回液开关阀410是关闭，则开关阀不动作，仍是关闭；反之，则不动作，保持开启。此时，所述冷水机组制冷系统低压侧的低压压力P不会小于放置允许压力Pz，所述冷水机组制冷系统不会出现低压保护。
或者
只有所述Px1、Px2和Px3均大于Pz，才有Px＞Pr。主板发出“关”的信号给回液管开关阀410，回液管开关阀410关闭，压缩机100只从蒸发器300中抽冷媒。此时，所述冷水机组制冷系统低压侧的低压压力P不会小于放置允许压力Pz，所述冷水机组制冷系统不会出现低压保护。
请继续参见图1，在其中一个实施例中，所述主板判断所述冷水机组制冷系统进入放置制冷启动过程的步骤包括：
设定室外机组从上一次关机到此次开机之间允许的最大间隔时间为T，可选地所述T＝2天。主板检测机组此次启动时刻与上一次最后运行时刻之间的间隔时间t。比较t与T的大小关系，判断机组制冷启动模式。若t＜T，则机组制冷启动进入常规制冷启动模式；若t≧T，则机组制冷启动进入放置制冷启动模式。
请继续参见图1，在其中一个实施例中，所述放置制冷启动过程的持续时间为T2，所述放置制冷启动过程的持续时间T2届满后，则压缩机吸气端只从蒸发器中抽冷媒。所述放置制冷启动过程的持续时间T2届满，所述回液管开关阀关闭，所述放置制冷启动过程关闭。可选地，T2可以选择长点或者短点，但不易过小或过大，较适宜地，T2＝3分钟。因为机组运行时长超过3分钟，则机组已经超过了放置制冷启动持续时长，而回液管开关阀动作判定逻辑是在放置制冷启动过程中才有，其作用也是为了在放置制冷启动过程中提 高低压压力，因此在机组脱离此条件运行时，开关阀需要与放置制冷模式一起关闭，进入常规制冷模式。
请参阅图2，一种风冷冷水机组制冷系统，包括压缩机100、冷凝器200、蒸发器300以及回液管路400。所述回液管路400与所述蒸发器300并联设置，所述回液管路400上设置有回液管开关阀410。可选地，所述开关阀410为电磁阀。风冷冷水机组制冷系统在机组制冷启动进入放置制冷启动模式时，主板检测到冷水机组制冷系统低压侧的实际低压压力为P小于风冷冷水机组制冷系统低压侧的放置允许压力Pz，则控制回液管开关阀410打开，压缩机100从回液管路400和蒸发器300一起抽冷媒，将压力值上升到安全范围，避免出现低压保护。主板检测到冷水机组制冷系统低压侧的实际低压压力为P大于风冷冷水机组制冷系统低压侧的放置允许压力Pz，则控制回液管开关阀410关闭，压缩机100从蒸发器300抽冷媒，将压力值保证在安全范围，避免出现低压保护。
本申请的风冷冷水机组制冷系统启动控制方法，设定风冷冷水机组制冷系统低压侧的放置允许压力为Pz，主板控制风冷冷水机组制冷系统开启放置制冷启动过程，每隔时间t1检测一次冷水机组制冷系统低压侧的实际低压压力P，连续时间T1内检测的所述实际低压压力为Px，且T1≥t1，x≥1。通过将实际低压压力Px与所述放置允许压力Pz比较，控制压缩机吸气端只从蒸发器中抽冷媒或同时从蒸发器以及冷凝器中抽冷媒。控制压缩机吸气端同时从蒸发器以及冷凝器中抽冷媒时，将由于环境温度变化导致迁往冷凝器中的冷媒不经过蒸发器而直接抽到压缩机的吸气口中，从而避免风冷冷水机组制冷系统启动时发生低压保护。采用上述控制方法可以避免风冷冷水机组制冷系统启动时发生低压保护，减少机组故障，提高用户舒适性。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请专利的保护范围应以所附权利要求为准。

Claims (12)

  1. 一种风冷冷水机组制冷系统启动控制方法，其特征在于，包括以下步骤：
    设定风冷冷水机组制冷系统低压侧的放置允许压力为Pz；
    控制风冷冷水机组制冷系统开启放置制冷启动过程，每隔时间t1检测一次冷水机组制冷系统低压侧的实际低压压力P，连续时间T1内检测的所述实际低压压力为Px，且T1≥t1，x≥1；
    通过将所述实际低压压力Px与所述放置允许压力Pz比较，控制压缩机吸气端只从蒸发器中抽冷媒或同时从蒸发器以及冷凝器中抽冷媒。
  2. 根据权利要求1所述的风冷冷水机组制冷系统启动控制方法，其特征在于，所述通过将实际低压压力Px与所述放置允许压力Pz比较，控制压缩机吸气端只从蒸发器中抽冷媒或同时从蒸发器以及冷凝器中抽冷媒的步骤包括：
    若Px＜Pz，则压缩机吸气端同时从蒸发器以及冷凝器中抽冷媒。
  3. 根据权利要求2所述的风冷冷水机组制冷系统启动控制方法，其特征在于，所述通过将所述实际低压压力Px与所述放置允许压力Pz比较，控制压缩机吸气端只从蒸发器中抽冷媒或同时从蒸发器以及冷凝器中抽冷媒的步骤还包括：
    设定所述冷水机组制冷系统低压侧的恢复压力为Pr，Pr＞Pz；
    若Pz≤Px≤Pr，则压缩机吸气端抽冷媒的途径与所述连续时间T1的起始点时刻压缩机吸气端抽冷媒的途径相同。
  4. 根据权利要求3所述的风冷冷水机组制冷系统启动控制方法，其特征在于，所述通过将所述实际低压压力Px与所述放置允许压力Pz比较，控制压缩机吸气端只从蒸发器中抽冷媒或同时从蒸发器以及冷凝器中抽冷媒的步骤还包括：
    若Px＞Pr，则压缩机吸气端只从蒸发器中抽冷媒。
  5. 根据权利要求4所述的风冷冷水机组制冷系统启动控制方法，其特征在于，所述T1≥N×t1，N≥1，所述连续时间T1内所述实际低压压力Px包括N次检测结果Px1、Px2…PxN；
    只有所述Px1、Px2…PxN均小于Pz,则压缩机吸气端同时从蒸发器以及冷凝器中抽冷媒；
    或者
    只有所述Px1、Px2…PxN均大于等于Pz，且所述Px1、Px2…PxN均小于等于Pr，则压缩机吸气端抽冷媒的途径与所述连续时间T1的起始点时刻压缩机吸气端抽冷媒的途径 相同；
    或者
    只有所述Px1、Px2…PxN均大于Pz，则压缩机吸气端只从蒸发器中抽冷媒。
  6. 根据权利要求1所述的风冷冷水机组制冷系统启动控制方法，其特征在于，所述Pz＝250kpa。
  7. 根据权利要求3所述的风冷冷水机组制冷系统启动控制方法，其特征在于，
    所述Pr＝300kpa。
  8. 根据权利要求1所述的风冷冷水机组制冷系统启动控制方法，其特征在于，所述控制所述冷水机组制冷系统开启放置制冷启动过程的步骤包括：
    设定风冷冷水机组制冷系统从上一次关机到此次开机之间允许的最大时间间隔为T；
    检测风冷冷水机组制冷系统此次启动时刻与上一次最后运行时刻之间的时间间隔t；
    若t≧T，则控制所述冷水机组制冷系统开启放置制冷启动过程。
  9. 根据权利要求8所述的风冷冷水机组制冷系统启动控制方法，其特征在于，所述T＝2天。
  10. 根据权利要求8所述的风冷冷水机组制冷系统启动控制方法，其特征在于，所述放置制冷启动过程的持续时间为T2，T2＞T1，所述放置制冷启动过程的持续时间T2届满后，则压缩机吸气端只从蒸发器中抽冷媒。
  11. 根据权利要求10所述的风冷冷水机组制冷系统启动控制方法，其特征在于，所述T2＝3min。
  12. 一种风冷冷水机组制冷系统，包括压缩机(100)、冷凝器(200)、蒸发器(300)，其特征在于，还包括回液管路(400)，所述回液管路(400)与所述蒸发器(300)并联设置，所述回液管路(400)上设置有回液管开关阀(410)。
PCT/CN2018/121919 2018-09-19 2018-12-19 风冷冷水机组制冷系统及其启动控制方法 Ceased WO2020056955A1 (zh)

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