CN105091442A - Intelligent defrosting method for multi-split air conditioner - Google Patents
Intelligent defrosting method for multi-split air conditioner Download PDFInfo
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- 238000010257 thawing Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 238000012544 monitoring process Methods 0.000 claims description 4
- 239000003507 refrigerant Substances 0.000 description 8
- 238000001816 cooling Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1931—Discharge pressures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2106—Temperatures of fresh outdoor air
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
一种多联机的智能除霜方法，它包括以下步骤：a、制热模式下，压缩机连续运转5分钟且已累计运转40分钟后，在接下来的连续5分钟，只要始终同时满足以下条件，那么多联机进入到除霜模式：①、Pd≤19bar；②、Tdef≤C×Tao－α；其中，α＝8℃，当Tao＜0℃时，C＝0.8，当Tao≥0℃，C＝0.6；b、如果满足条件①，但不满足条件②，那么压缩机连续运转90分钟后多联机进入到除霜模式；c、如果满足条件②，但不满足条件①，那么压缩机连续运转90分钟后多联机进入到除霜模式。本发明的优点是：使多联机能够在南北方冬季不同气候条件下都能够正常使用，并能有效防止控制器对多联机发出错误除霜指令的情况发生。A multi-connected intelligent defrosting method, which includes the following steps: a. In the heating mode, after the compressor runs continuously for 5 minutes and has accumulated 40 minutes of running, in the next 5 consecutive minutes, as long as the following conditions are always met at the same time , so many lines enter the defrosting mode: ①, Pd≤19bar; ②, Tdef≤C×Tao－α; among them, α＝8℃, when Tao＜0℃, C＝0.8, when Tao≥0℃, C=0.6; b. If condition ① is met but condition ② is not met, then the multi-unit will enter the defrosting mode after the compressor runs continuously for 90 minutes; c. If condition ② is met but condition ① is not met, the compressor will continue to operate After running for 90 minutes, the multi-line will enter the defrosting mode. The invention has the advantages of enabling the multi-connector to be used normally under different climatic conditions in winter in the north and south, and effectively preventing the controller from issuing wrong defrosting instructions to the multi-connector.
Description
技术领域technical field
本发明涉及多联机，具体讲是一种多联机的智能除霜方法。The invention relates to a multi-connection system, in particular to a multi-connection intelligent defrosting method.
背景技术Background technique
多联式空调机组简称多联机，它包括控制器、室外机、多个相互并联的室内机以及连接各室内机和室外机的两根冷媒流通总管，室外机通过两根冷媒流通总管与并联后的多个室内机连通，控制器同时与室外机及多个相互并联的室内机电连接。室外机包括压缩机、油分离器、四通换向阀、室外换热器(制冷时为冷凝器而制热时为蒸发器)和气液分离器，压缩机出口与油分离器的入口连通，油分离器的出口与四通换向阀的第一阀口连通，四通换向阀第二阀口与室外换热器一端连通，室外换热器另一端与两根冷媒流通总管中的一根连通，而两根冷媒流通总管中的另一根冷媒流通总管与室外机的四通换向阀第三阀口连通，四通换向阀第四阀口与气液分离器的入口连接，气液分离器的出口与压缩机入口连通。每个室内机包括电子膨胀阀和室内换热器(制冷时为蒸发器而制热时为冷凝器)，室内换热器的一端与电子膨胀阀的一端连通，电子膨胀阀的另一端与两根冷媒流通总管中的一根连通，室内换热器的另一端与两根冷媒流通总管中的另一根冷媒流通总管连通。上述的多联机工作在制冷模式时，四通换向阀的第一阀口与第二阀口连通，第三阀口与第四阀口连通，即冷媒沿着压缩机、室外换热器、室内换热器、压缩机这个路线循环；上述的多联机工作在制热模式时，四通换向阀的第一阀口与第三阀口连通，第二阀口与第四阀口连通，冷媒沿着压缩机、室内换热器、室外换热器、压缩机这个路线循环。The multi-connected air conditioner unit is referred to as multi-connected unit, which includes a controller, an outdoor unit, multiple indoor units connected in parallel, and two refrigerant circulation main pipes connecting each indoor unit and outdoor unit. The multiple indoor units are connected, and the controller is simultaneously connected with the outdoor unit and multiple indoor electromechanical devices connected in parallel. The outdoor unit includes a compressor, an oil separator, a four-way reversing valve, an outdoor heat exchanger (a condenser for cooling and an evaporator for heating) and a gas-liquid separator. The outlet of the compressor is connected to the inlet of the oil separator. The outlet of the oil separator is connected with the first valve port of the four-way reversing valve, the second valve port of the four-way reversing valve is connected with one end of the outdoor heat exchanger, and the other end of the outdoor heat exchanger is connected with one of the two refrigerant circulation main pipes. The other one of the two refrigerant circulation main pipes is connected to the third valve port of the four-way reversing valve of the outdoor unit, and the fourth valve port of the four-way reversing valve is connected to the inlet of the gas-liquid separator. The outlet of the gas-liquid separator communicates with the inlet of the compressor. Each indoor unit includes an electronic expansion valve and an indoor heat exchanger (an evaporator for cooling and a condenser for heating). One end of the indoor heat exchanger communicates with one end of the electronic expansion valve, and the other end of the electronic expansion valve communicates with two One of the two refrigerant circulation main pipes is connected, and the other end of the indoor heat exchanger is connected with the other refrigerant circulation main pipe of the two refrigerant circulation main pipes. When the above-mentioned multi-line works in cooling mode, the first valve port of the four-way reversing valve is connected with the second valve port, and the third valve port is connected with the fourth valve port, that is, the refrigerant flows along the compressor, outdoor heat exchanger, The route of the indoor heat exchanger and the compressor circulates; when the above-mentioned multi-connector works in the heating mode, the first valve port of the four-way reversing valve is connected to the third valve port, and the second valve port is connected to the fourth valve port. The refrigerant circulates along the route of the compressor, indoor heat exchanger, outdoor heat exchanger, and compressor.
在冬季，当多联机在制热模式下运行时，室外空气与室外机换热器盘管进行换热。室外空气在与室外机换热器盘管换热后会因温度降低而导致其所携带的水汽凝结在室外机换热器盘管表面处，致使室外机换热器盘管结霜。目前，现有多联机的除霜方法一般都是采用一个用于监测室外机换热器盘管制热进口温度的温度传感器来判断室外机换热器盘管是否结霜，如果该温度传感器所测得的温度低于控制器预设的除霜温度，那么控制器就会认定室外机换热器盘管结霜并发出指令让多联机进入除霜模式。上述的多联机除霜方法虽然简单，但是也存在以下缺陷：1、由于北方冬季气温普遍较低，以致于室外的环境温度会长时间甚至整天都低于多联机预设的除霜温度，因此用于监测室外机换热器盘管制热进口温度的温度传感器所测得的温度很容易满足控制器认定室外机换热器盘管结霜的标准，从而会使多联机频繁地进入除霜模式，而我们知道，虽然北方冬季气温低，但是室外空气却比较干燥，空气中水汽较少，因此多联机使用较长时间后，室外机换热器盘管处结霜也不会太严重，并不会影响多联机的正常使用，因此多联机片频繁地进入除霜模式反而会造成室内温度的频繁上下波动，从而极易导致客户使用不适；2、相对北方而言，南方冬季气温普遍较高，室外的环境温度会长时间甚至整天都高于控制器预设的除霜温度，因此用于监测室外机换热器盘管制热进口温度的温度传感器所测得的温度很难达到控制器预设的除霜温度，从而使多联机无法进入除霜模式，但由于南方的室外空气湿度较大，因此多联机使用较长时间后，室外机换热器盘管处结霜往往会比较严重，从而会影响多联机的正常使用；3、用于监测室外机换热器盘管制热进口温度的温度传感器在长期使用后其测得的温度有可能会产生偏移，这会直接导致控制器因接收到错误的温度信号而对多联机发出做出错误的指令，从而会影响多联机的正常使用，比如在室外机换热器盘管无需进行除霜时，多联机从制热模式切换进入除霜模式，或是在室外机换热器盘管需要进行除霜时，多联机无法进入除霜模式。In winter, when the multi-split unit is operating in heating mode, the outdoor air exchanges heat with the outdoor unit heat exchanger coil. After the outdoor air exchanges heat with the heat exchanger coil of the outdoor unit, the water vapor carried by it will condense on the surface of the heat exchanger coil of the outdoor unit due to the temperature drop, resulting in frosting of the heat exchanger coil of the outdoor unit. At present, the existing multi-line defrosting methods generally use a temperature sensor for monitoring the heat inlet temperature of the outdoor heat exchanger coil to judge whether the outdoor heat exchanger coil is frosted. If the obtained temperature is lower than the defrosting temperature preset by the controller, the controller will determine that the outdoor unit heat exchanger coil is frosted and issue a command to let the multi-split unit enter the defrosting mode. Although the above multi-line defrosting method is simple, it also has the following defects: 1. Because the winter temperature in the north is generally low, the outdoor ambient temperature will be lower than the multi-line preset defrosting temperature for a long time or even all day long. Therefore, the temperature measured by the temperature sensor used to monitor the heat inlet temperature of the outdoor heat exchanger coil can easily meet the controller's standard for frosting of the outdoor heat exchanger coil, which will cause the multiple units to frequently enter defrosting We know that although the temperature in winter in the north is low, the outdoor air is relatively dry and there is less water vapor in the air. Therefore, after a long period of multi-line use, the frost on the heat exchanger coil of the outdoor unit will not be too serious. It will not affect the normal use of the multi-connector, so the frequent entry of the multi-connector into the defrosting mode will cause frequent fluctuations in the indoor temperature, which will easily cause discomfort for customers; 2. Compared with the north, the temperature in the south is generally cooler in winter. High, the outdoor ambient temperature will be higher than the defrosting temperature preset by the controller for a long time or even all day long, so the temperature measured by the temperature sensor used to monitor the heat inlet temperature of the heat exchanger coil of the outdoor unit is difficult to control However, due to the high humidity of the outdoor air in the south, after using the multi-line for a long time, the frost on the heat exchanger coil of the outdoor unit tends to increase. Serious, which will affect the normal use of the multi-line; 3. The temperature sensor used to monitor the heat inlet temperature of the heat exchanger coil of the outdoor unit may drift after long-term use, which will directly lead to control failure. Due to the wrong temperature signal received by the controller, the multi-split unit will issue wrong commands, which will affect the normal use of the multi-split unit. For example, when the heat exchanger coil of the outdoor unit does not need to defrost, the multi-split unit will switch from heating mode When entering the defrosting mode, or when the heat exchanger coil of the outdoor unit needs to be defrosted, the multi-split unit cannot enter the defrosting mode.
发明内容Contents of the invention
本发明要解决的一个技术问题是，提供一种多联机的智能除霜方法，从而使多联机不但能够在北方冬季气温较低、室外空气比较干燥的环境下正常使用，而且还能够在南方冬季气温较高、室外空气湿度较大的环境下正常使用，同时能够有效防止控制器因接收到用于监测室外机换热器盘管制热进口温度的温度传感器的错误温度信号而对多联机发出错误指令的情况发生。A technical problem to be solved by the present invention is to provide a multi-line intelligent defrosting method, so that the multi-line can not only be used normally in the environment where the temperature is low in winter in the north and the outdoor air is relatively dry, but also can be used in winter in the south. It can be used normally in an environment with high temperature and high outdoor air humidity, and at the same time, it can effectively prevent the controller from sending an error to the multi-line due to receiving the wrong temperature signal from the temperature sensor used to monitor the heat inlet temperature of the heat exchanger coil of the outdoor unit. instruction occurs.
为解决上述技术问题，本发明的技术方案是：提供一种多联机的智能除霜方法，它包括以下步骤：In order to solve the above-mentioned technical problems, the technical solution of the present invention is to provide a multi-line intelligent defrosting method, which includes the following steps:
a、多联机在制热模式下，室外机的压缩机连续运转5分钟且已累计运转40分钟后，通过用于监测室外机换热器盘管制热进口温度的温度传感器将其测得的实时室外机换热器盘管制热进口温度发送给控制器，通过用于监测室外环境温度的温度传感器将其测得的实时室外环境温度发送给控制器，通过用于监测室外机内压缩机排气压力的排气压力传感器将其测得的实时室外机内压缩机的排气压力发送给控制器，在接下来的连续5分钟，只要始终同时满足以下条件，那么控制器就发送指令给多联机，让多联机进入到除霜模式：a. In the heating mode of the multi-connected unit, after the compressor of the outdoor unit has been running continuously for 5 minutes and has been running for 40 minutes, the real-time temperature measured by the temperature sensor used to monitor the heat inlet temperature of the heat exchanger coil of the outdoor unit is measured. The heat inlet temperature of the heat exchanger coil of the outdoor unit is sent to the controller, and the real-time outdoor ambient temperature measured by the temperature sensor used to monitor the outdoor ambient temperature is sent to the controller. The exhaust pressure sensor of the pressure will send the measured real-time exhaust pressure of the compressor in the outdoor unit to the controller. In the next 5 minutes, as long as the following conditions are always met at the same time, the controller will send instructions to the multi-line , let the multi-connector enter the defrost mode:
①、Pd≤19bar；①, Pd≤19bar;
②、Tdef≤C×Tao－α；②, Tdef≤C×Tao－α;
其中，Pd为室外机内压缩机的排气压力，Tdef为实时室外机换热器盘管制热进口温度，Tao为实时室外环境温度，α＝8℃，当Tao＜0℃时，C＝0.8，当Tao≥0℃，C＝0.6；Among them, Pd is the exhaust pressure of the compressor in the outdoor unit, Tdef is the real-time heat inlet temperature of the heat exchanger coil of the outdoor unit, Tao is the real-time outdoor ambient temperature, α=8°C, when Tao<0°C, C=0.8 , when Tao≥0℃, C=0.6;
b、多联机在制热模式下持续运行过程中，如果始终满足步骤a中的条件①，但是始终不满足条件②，那么在室外机的压缩机连续运转90分钟后控制器就发送指令给多联机，让多联机进入到除霜模式；b. During the continuous operation of the multi-unit in the heating mode, if the condition ① in step a is always satisfied, but the condition ② is not satisfied, then the controller will send an instruction to the multi-unit after the compressor of the outdoor unit runs continuously for 90 minutes. Online, let the multi-connection enter the defrosting mode;
c、多联机在制热模式下持续运行过程中，如果始终满足步骤a中的条件②，但是始终不满足条件①，那么室外机的压缩机连续运转90分钟后控制器就发送指令给多联机，让多联机进入到除霜模式。c. During the continuous operation of the multi-split unit in the heating mode, if the condition ② in step a is always met, but the condition ① is not met, then the controller will send an instruction to the multi-split unit after the compressor of the outdoor unit has been running continuously for 90 minutes. , let the multi-connector enter the defrost mode.
本发明所述的多联机的智能除霜方法，其中，多联机的智能除霜方法还包括以下步骤：The multi-connection intelligent defrosting method according to the present invention, wherein the multi-connection intelligent defrosting method further includes the following steps:
d、多联机在制热模式下持续运行过程中如果同时满足步骤a中的两个条件并已经通过除霜模式成功除霜，那么在判断步骤b和步骤c中的条件时，室外机的压缩机连续运转时间需要先清零。d. If the two conditions in step a are met during the continuous operation of the multi-split unit in the heating mode and the defrosting mode has been successfully defrosted, then when judging the conditions in steps b and c, the compression of the outdoor unit The continuous running time of the machine needs to be cleared first.
本发明所述的多联机的智能除霜方法，其中，多联机的智能除霜方法还包括以下步骤：The multi-connection intelligent defrosting method according to the present invention, wherein the multi-connection intelligent defrosting method further includes the following steps:
e、多联机在制热模式下持续运行过程中遇到正常关机，那么在多联机下一次开机并进入制热模式时，室外机的压缩机连续运转时间需要累计上次多联机正常关机前的室外机的压缩机连续运转时间。e. When the multi-connected unit encounters a normal shutdown during continuous operation in the heating mode, when the multi-connected unit is turned on next time and enters the heating mode, the continuous running time of the compressor of the outdoor unit needs to accumulate the time before the last multi-connected unit was shut down normally. The continuous operation time of the compressor of the outdoor unit.
本发明所述的多联机的智能除霜方法，其中，多联机的智能除霜方法还包括以下步骤：The multi-connection intelligent defrosting method according to the present invention, wherein the multi-connection intelligent defrosting method further includes the following steps:
f、多联机在正常运行过程中如果遇到运行故障，那么室外机的压缩机连续运转时间清零。f. If the multi-split unit encounters an operation failure during normal operation, the continuous operation time of the compressor of the outdoor unit will be reset to zero.
采用以上方法后，与现有技术相比，本发明多联机的智能除霜方法具有以下优点：After adopting the above method, compared with the prior art, the multi-line intelligent defrosting method of the present invention has the following advantages:
1、我们知道，多联机在制热模式下持续运行时，为保证一定的出风温度，必须使室外机的压缩机排气压力保持在一个较高压的范围之内，可一旦室外机换热器盘管处结霜，就会大大减少室外机换热器盘管的换热面积，从而降低室外换热器的换热效率，进而影响室内机的出风温度，此时室外机内压缩机的排气压力也会降低，因此，本发明多联机的智能除霜方法在将实时室外机换热器盘管制热进口温度作为判断室外机换热器盘管是否结霜的依据的基础上，同时将实时室外机内压缩机的排气压力也作为判断室外机换热器盘管是否结霜的依据，从而在步骤a的判断方法下，使控制器能够更精确地判断室外机换热器盘管是否结霜，从而能够使多联机不但能够在北方冬季气温较低、室外空气比较干燥的环境下正常使用，而且还能够在南方冬季气温较高、室外空气湿度较大的环境下正常使用。1. We know that when the multi-split unit is running continuously in the heating mode, in order to ensure a certain outlet air temperature, the exhaust pressure of the compressor of the outdoor unit must be kept within a relatively high pressure range, but once the heat exchange of the outdoor unit Frost on the coil of the outdoor unit will greatly reduce the heat exchange area of the heat exchanger coil of the outdoor unit, thereby reducing the heat exchange efficiency of the outdoor heat exchanger and further affecting the outlet air temperature of the indoor unit. At this time, the compressor in the outdoor unit The exhaust pressure of the outdoor unit heat exchanger will also be reduced. Therefore, the multi-line intelligent defrosting method of the present invention uses the real-time heat inlet temperature of the outdoor unit heat exchanger coil as the basis for judging whether the outdoor unit heat exchanger coil is frosted. At the same time, the real-time exhaust pressure of the compressor inside the outdoor unit is also used as the basis for judging whether the heat exchanger coil of the outdoor unit is frosted, so that the controller can judge the heat exchanger of the outdoor unit more accurately under the judgment method of step a. Whether the coil is frosted or not, so that the multi-split unit can not only be used normally in the environment with low winter temperature and relatively dry outdoor air in the north, but also can be used normally in the environment with high winter temperature and high outdoor air humidity in the south .
2、步骤b的判断方法能够有效防止室外机换热器盘管处已经结霜，但由于用于监测室外机换热器盘管制热进口温度的温度传用于感器因故脱落或是在长期使用后其测得的实时室外机换热器盘管制热进口温度产生偏移而导致控制器因接收到错误的温度信号而无法向多联机发出正确的指令，进而导致多联机无法进入除霜模式的情况发生，从而有效保证了多联机的正常使用。2. The judgment method in step b can effectively prevent frost from forming on the coil of the outdoor unit heat exchanger, but the temperature sensor used to monitor the heat inlet temperature of the outdoor unit heat exchanger coil falls off for some reason or is in the After long-term use, the measured real-time heat inlet temperature of the outdoor unit heat exchanger coil deviates, which causes the controller to fail to send correct instructions to the multi-connectors due to receiving wrong temperature signals, resulting in the failure of the multi-connectors to enter defrosting Mode occurs, thus effectively guaranteeing the normal use of multi-connection.
3、步骤c的判断方法能够有效防止室外机换热器盘管处已经结霜，但由于用于监测室外机的压缩机排气口处排气压力的压力传感器因故脱落或是在长期使用后其测得的实时室外机的压缩机排气口处的排气压力产生偏移而导致控制器因接收到错误的压力信号而无法向多联机发出正确的指令，进而导致多联机无法进入除霜模式的情况发生，从而有效保证了多联机的正常使用。3. The judgment method in step c can effectively prevent frost from forming on the heat exchanger coil of the outdoor unit. Afterwards, the measured real-time exhaust pressure at the compressor outlet of the outdoor unit deviates, causing the controller to fail to issue correct instructions to the multi-connector due to receiving a wrong pressure signal, which in turn leads to the inability of the multi-connector to enter the exclusion zone. Frost mode occurs, thus effectively ensuring the normal use of multi-line.
4、步骤d的判断方法能够避免多联机频繁地进入除霜模式，从而能够进一步保证多联机的正常使用。4. The judging method in step d can prevent the multi-connector from frequently entering the defrosting mode, thereby further ensuring the normal use of the multi-connector.
5、步骤e的判断方法能够防止多联机因频繁的开停机而导致其不能进入除霜模式的情况发生。5. The judging method in step e can prevent the situation that the multi-line unit cannot enter the defrosting mode due to frequent startup and shutdown.
6、步骤f的判断方法能够避免多联在机维修时自动进入除霜模式，从而不会给维修工作造成麻烦。6. The judging method in step f can prevent the multi-unit from automatically entering the defrosting mode during on-machine maintenance, so as not to cause trouble to the maintenance work.
具体实施方式Detailed ways
下面结合具体实施方式对本发明多联机的智能除霜方法作进一步的详细说明。The multi-connected intelligent defrosting method of the present invention will be further described in detail below in combination with specific embodiments.
本具体实施方式中，本发明多联机的智能除霜方法包括以下步骤：In this specific embodiment, the multi-connected intelligent defrosting method of the present invention includes the following steps:
a、多联机在制热模式下，室外机的压缩机连续运转5分钟且已累计运转40分钟后，通过用于监测室外机换热器盘管制热进口温度的温度传感器将其测得的实时室外机换热器盘管制热进口温度发送给控制器，通过用于监测室外环境温度的温度传感器将其测得的实时室外环境温度发送给控制器，通过用于监测室外机内压缩机排气压力的排气压力传感器将其测得的实时室外机内压缩机的排气压力发送给控制器，在接下来的连续5分钟，只要始终同时满足以下条件，那么控制器就发送指令给多联机，让多联机进入到除霜模式：a. In the heating mode of the multi-connected unit, after the compressor of the outdoor unit has been running continuously for 5 minutes and has been running for 40 minutes, the real-time temperature measured by the temperature sensor used to monitor the heat inlet temperature of the heat exchanger coil of the outdoor unit is measured. The heat inlet temperature of the heat exchanger coil of the outdoor unit is sent to the controller, and the real-time outdoor ambient temperature measured by the temperature sensor used to monitor the outdoor ambient temperature is sent to the controller. The exhaust pressure sensor of the pressure will send the measured real-time exhaust pressure of the compressor in the outdoor unit to the controller. In the next 5 minutes, as long as the following conditions are always met at the same time, the controller will send instructions to the multi-line , let the multi-connector enter the defrost mode:
①、Pd≤19bar；①, Pd≤19bar;
②、Tdef≤C×Tao－α；②, Tdef≤C×Tao－α;
其中，Pd为室外机内压缩机的排气压力，Tdef为实时室外机换热器盘管制热进口温度，Tao为实时室外环境温度，α＝8℃，当Tao＜0℃时，C＝0.8，当Tao≥0℃，C＝0.6；Among them, Pd is the exhaust pressure of the compressor in the outdoor unit, Tdef is the real-time heat inlet temperature of the heat exchanger coil of the outdoor unit, Tao is the real-time outdoor ambient temperature, α=8°C, when Tao<0°C, C=0.8 , when Tao≥0℃, C=0.6;
b、多联机在制热模式下持续运行过程中，如果始终满足步骤a中的条件①，但是始终不满足条件②，那么在室外机的压缩机连续运转90分钟后控制器就发送指令给多联机，让多联机进入到除霜模式；b. During the continuous operation of the multi-unit in the heating mode, if the condition ① in step a is always satisfied, but the condition ② is not satisfied, then the controller will send an instruction to the multi-unit after the compressor of the outdoor unit runs continuously for 90 minutes. Online, let the multi-connection enter the defrosting mode;
c、多联机在制热模式下持续运行过程中，如果始终满足步骤a中的条件②，但是始终不满足条件①，那么室外机的压缩机连续运转90分钟后控制器就发送指令给多联机，让多联机进入到除霜模式；c. During the continuous operation of the multi-split unit in the heating mode, if the condition ② in step a is always met, but the condition ① is not met, then the controller will send an instruction to the multi-split unit after the compressor of the outdoor unit has been running continuously for 90 minutes. , let the multi-connector enter the defrosting mode;
d、多联机在制热模式下持续运行过程中如果同时满足步骤a中的两个条件并已经通过除霜模式成功除霜，那么在判断步骤b和步骤c中的条件时，室外机的压缩机连续运转时间需要先清零；d. If the two conditions in step a are met during the continuous operation of the multi-split unit in the heating mode and the defrosting mode has been successfully defrosted, then when judging the conditions in steps b and c, the compression of the outdoor unit The continuous running time of the machine needs to be cleared first;
e、多联机在制热模式下持续运行过程中遇到正常关机，那么在多联机下一次开机并进入制热模式时，室外机的压缩机连续运转时间需要累计上次多联机正常关机前的室外机的压缩机连续运转时间；e. When the multi-connected unit encounters a normal shutdown during continuous operation in the heating mode, when the multi-connected unit is turned on next time and enters the heating mode, the continuous running time of the compressor of the outdoor unit needs to accumulate the time before the last multi-connected unit was shut down normally. The continuous running time of the compressor of the outdoor unit;
f、多联机在正常运行过程中如果遇到运行故障，那么室外机的压缩机连续运转时间清零。f. If the multi-split unit encounters an operation failure during normal operation, the continuous operation time of the compressor of the outdoor unit will be reset to zero.
本发明中提及的所有温度传感器及压力传感器均为多联机本身自带，此为现有常规技术，故不在此赘述。All the temperature sensors and pressure sensors mentioned in the present invention are self-contained by the multi-line itself, which is the existing conventional technology, so it will not be repeated here.
以上的实施例仅仅是对本发明的优选实施方式进行描述，并非对本发明的范围进行限定，在不脱离本发明设计精神的前提下，本领域普通技术人员对本发明的技术方案作出的各种变形和改进，均应落入本发明权利要求书确定的保护范围内。The above embodiments are only descriptions of the preferred implementations of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, those skilled in the art may make various modifications and changes to the technical solutions of the present invention. Improvements should all fall within the scope of protection determined by the claims of the present invention.
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