CN102278804B - Control method for preventing bias flow of refrigerants during heating of multi-connected air conditioning unit - Google Patents
Control method for preventing bias flow of refrigerants during heating of multi-connected air conditioning unit Download PDFInfo
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Abstract
本发明公开了一种多联式空调机组制热时防止冷媒偏流的控制方法，其步骤为：a、开机；b、测量室内换热器（2）中部的温度T0，T0最高的室内机冷媒最多，T0最低的室内机冷媒最少；c、测量冷媒最少的室内机的室内换热器（2）的出口温度T1min，测量冷媒最多的室内机的室内换热器（2）的出口温度T1max，算两者差值△T；d、判断△T是否大于或等于5，是，则将冷媒最少的室内机的内机电子膨胀阀（4）的开度增大，将冷媒最多的室内机的内机电子膨胀阀（4）的开度减小；e、每隔一段时间，重复步骤b~d，直至停机。该控制方法既保证各个室内机的制热效果均较好又不会造成浪费。
The invention discloses a control method for preventing refrigerant bias flow when a multi-connected air conditioner unit is heating. The steps are: a. Start up; b. Measure the temperature T 0 in the middle of the indoor heat exchanger (2), and the indoor temperature with the highest T 0 The indoor unit with the lowest refrigerant has the most refrigerant, and the indoor unit with the lowest T 0 has the least refrigerant; c. Measure the outlet temperature T 1min of the indoor heat exchanger (2) of the indoor unit with the least refrigerant, and measure the temperature of the indoor heat exchanger (2) of the indoor unit with the largest refrigerant Outlet temperature T 1max , calculate the difference △T between the two; d, judge whether △T is greater than or equal to 5, if yes, increase the opening of the electronic expansion valve (4) of the indoor unit with the least refrigerant The opening of the indoor unit electronic expansion valve (4) of the most indoor units decreases; e. Repeat steps b~d at regular intervals until the machine stops. The control method not only ensures that the heating effect of each indoor unit is good, but also causes no waste.
Description
技术领域 technical field
本发明涉及多联式空调机组，具体讲是一种多联式空调机组制热时防止冷媒偏流的控制方法。 The invention relates to a multi-connected air-conditioning unit, in particular to a control method for preventing refrigerant bias flow when the multi-connected air-conditioning unit is heating.
背景技术 Background technique
现有技术的多联式空调机组包括一个或多个室外机、多个相互并联的室内机以及连接各室内机和各室外机的两根冷媒流通总管。如果室外机为一个，该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；如果室外机为多个，则多个室外机并联，并联后的室外机通过两根冷媒流通总管与并联后的室内机连通。 The multi-connected air conditioner unit in the prior art includes one or more outdoor units, a plurality of indoor units connected in parallel, and two refrigerant circulation main pipes connecting each indoor unit and each outdoor unit. If there is one outdoor unit, the outdoor unit is connected to multiple indoor units connected in parallel through two refrigerant circulation main pipes; if there are multiple outdoor units, multiple outdoor units are connected in parallel, and the parallel outdoor units pass through two refrigerant circulation main pipes Connect with the indoor unit connected in parallel. the
每个室外机包括压缩机、油分离器、四通换向阀、室外换热器（制热模式时为蒸发器）、节流装置、储液器和气液分离器。压缩机出口与油分离器的一端连通，油分离器的另一端与四通换向阀的第一阀口连通，四通换向阀的第三阀口与两根冷媒流通总管中的一根冷媒管连通，两根冷媒流通总管中的另一根冷媒管与储液器的一端连通，储液器的另一端节流装置的一端连通，节流装置的另一端与室外换热器的一端连通，室外换热器的另一端与四通换向阀的第二阀口连通，四通换向阀的第四阀口与气液分离器的一端连接，气液分离器的另一端与压缩机入口连通。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，即冷媒沿着压缩机、室内换热器、室外换热器、压缩机这个路线循环。 Each outdoor unit includes compressor, oil separator, four-way reversing valve, outdoor heat exchanger (evaporator in heating mode), throttling device, liquid receiver and gas-liquid separator. The outlet of the compressor is connected with one end of the oil separator, the other end of the oil separator is connected with the first valve port of the four-way reversing valve, and the third valve port of the four-way reversing valve is connected with one of the two refrigerant circulation main pipes. The refrigerant pipe is connected, the other refrigerant pipe of the two refrigerant circulation main pipes is connected with one end of the liquid receiver, the other end of the liquid receiver is connected with one end of the throttling device, and the other end of the throttling device is connected with one end of the outdoor heat exchanger The other end of the outdoor heat exchanger is connected to the second valve port of the four-way reversing valve, the fourth valve port of the four-way reversing valve is connected to one end of the gas-liquid separator, and the other end of the gas-liquid separator is connected to the compressor The machine entrance is connected. 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, that is, the refrigerant flows along the compressor, indoor heat exchanger, outdoor heat exchanger, The compressor loops this route.
每个室内机包括内机电子膨胀阀和室内换热器（制热模式时为冷凝器），室内换热器的一端与内机电子膨胀阀的一端连通，内机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管连通。室内换热器的入口、中部和出口分别设有三个温度传感器。上述的三个温度传感器及内机电子膨胀阀均与空调主控制器电连接。 Each indoor unit includes an indoor unit electronic expansion valve and an indoor heat exchanger (condenser in heating mode). One end of the indoor heat exchanger is connected to one end of the indoor unit electronic expansion valve, and the other end of the indoor unit electronic expansion valve is connected to the One of the two refrigerant circulation main pipes is communicated, and the other end of the indoor heat exchanger is communicated with the other refrigerant pipe of the two refrigerant circulation main pipes. Three temperature sensors are respectively provided at the inlet, middle and outlet of the indoor heat exchanger. The above three temperature sensors and the electronic expansion valve of the internal unit are all electrically connected to the main controller of the air conditioner.
多联式空调机包括多个室内机，最多为64个室内机，而每个室内机与室外机的距离不同，故空调长期运行，与室外机距离近的室内机的冷媒较多，与室外机距离远的室内机冷媒较少，即出现冷媒偏流现象。一旦冷媒偏流，冷媒较多的室外机堆积冷媒过多造成浪费，而冷媒较少的室内机的制热效果很差，而无法保证每个室内机的制热效果这一缺陷会严重影响多联式空调的推广和应用。 The multi-connected air conditioner includes multiple indoor units, up to 64 indoor units, and the distance between each indoor unit and outdoor unit is different, so the air conditioner runs for a long time, and the indoor unit with the closest distance to the outdoor unit has more refrigerant, and the distance between the indoor unit and the outdoor unit is different. The indoor unit with a long distance from the unit has less refrigerant, which means that the refrigerant is biased. Once the refrigerant flow is biased, the outdoor unit with more refrigerant will accumulate too much refrigerant, causing waste, while the indoor unit with less refrigerant will have a poor heating effect, and the heating effect of each indoor unit cannot be guaranteed. This defect will seriously affect the multi-connection system. The promotion and application of air conditioners.
发明内容 Contents of the invention
本发明要解决的技术问题是，提供一种既保证各个室内机的制热效果均较好又不会造成浪费的多联式空调机组制热时防止冷媒偏流的控制方法。 The technical problem to be solved by the present invention is to provide a control method for preventing refrigerant bias flow during heating of a multi-connected air conditioner unit that ensures good heating effect of each indoor unit and does not cause waste.
本发明的技术解决方案是，提供一种多联式空调机组制热时防止冷媒偏流的控制方法，其具体步骤如下： The technical solution of the present invention is to provide a control method for preventing refrigerant bias flow when a multi-connected air-conditioning unit is heating, and the specific steps are as follows:
a、将室外机的压缩机开机运行一段时间； a. Start the compressor of the outdoor unit and run it for a period of time;
b、通过每个室内机的室内换热器中部的温度传感器测量每个室内机的室内换热器中部的温度T0，将测温结果发送给空调主控制器，室内换热器中部的温度T0最高的室内机为冷媒最多的室内机，室内换热器中部的温度T0最低的室内机为冷媒最少的室内机； b. Measure the temperature T 0 in the middle of the indoor heat exchanger of each indoor unit through the temperature sensor in the middle of the indoor heat exchanger of each indoor unit, and send the temperature measurement result to the main controller of the air conditioner, and the temperature in the middle of the indoor heat exchanger The indoor unit with the highest T 0 is the indoor unit with the most refrigerant, and the indoor unit with the lowest temperature T 0 in the middle of the indoor heat exchanger is the indoor unit with the least refrigerant;
c、通过冷媒最少的室内机的室内换热器的出口的温度传感器测量该室内机的室内换热器的出口的温度T1min，通过冷媒最多的室内机的室内换热器的出口的温度传感器测量该室内机的室内换热器的出口的温度T1max，将上述两个温度值传给空调主控制器，并计算出T1max减去T1min的差值△T； c. Measure the temperature T 1min of the outlet of the indoor heat exchanger of the indoor unit passing the least refrigerant through the temperature sensor at the outlet of the indoor heat exchanger of the indoor unit, and the temperature sensor of the outlet of the indoor heat exchanger of the indoor unit passing through the most refrigerant Measure the temperature T 1max of the outlet of the indoor heat exchanger of the indoor unit, transmit the above two temperature values to the main controller of the air conditioner, and calculate the difference ΔT of T 1max minus T 1min ;
d、判断△T是否大于或等于5，如果是，则将冷媒最少的室内机的内机电子膨胀阀的开度增大，同时将冷媒最多的室内机的内机电子膨胀阀的开度减小；如果否，则不进行调节； d. Determine whether △T is greater than or equal to 5. If so, increase the opening of the electronic expansion valve of the indoor unit with the least refrigerant, and decrease the opening of the electronic expansion valve of the indoor unit with the largest refrigerant. small; if no, no adjustment is made;
e、每间隔一段时间，重复步骤b~d，直至停机。 e. Repeat steps b~d at regular intervals until the machine stops.
该控制方法的原理为：冷媒最少的室内机的室内换热器中的冷凝的冷媒的比例最大，降温幅度也最大，故该室内机的室内换热器的中部温度T0最低；同理，冷媒最多的室内机的室内换热器中冷凝的冷媒的比例最小，降温幅度也最小，故该室内机的室内换热器的中部温度T0最高；故将T0最低的室内机的内机电子膨胀阀的开度增大，将T0最高的室内机的内机电子膨胀阀开度减小，就能调节各个室内机的偏流现象。 The principle of this control method is: the proportion of condensed refrigerant in the indoor heat exchanger of the indoor unit with the least refrigerant is the largest, and the cooling range is also the largest, so the middle temperature T 0 of the indoor heat exchanger of the indoor unit is the lowest; similarly, The proportion of condensed refrigerant in the indoor heat exchanger of the indoor unit with the most refrigerant is the smallest, and the temperature drop is also the smallest, so the temperature T 0 of the middle part of the indoor heat exchanger of the indoor unit is the highest; therefore, the indoor unit of the indoor unit with the lowest T 0 The opening of the electronic expansion valve is increased, and the opening of the electronic expansion valve of the indoor unit with the highest T 0 is decreased to adjust the bias flow phenomenon of each indoor unit.
采用以上方法，本发明多联式空调机组制热时防止冷媒偏流的控制方法与现有技术相比，具有以下优点： By adopting the above method, the control method for preventing refrigerant drift when the multi-connected air conditioner unit is heating in the present invention has the following advantages compared with the prior art:
该空调机组运行一段时间后，每隔一定时间就能增大冷媒最少的室内机的冷媒流量、减小冷媒最多的室内机的冷媒流量，即将偏流最严重的两个室内机的冷媒流量平衡，这样，多次调节后，能有效缓解改善偏流现象，使得各个室内机内的冷媒量均衡，避免冷媒较多的室内机造成浪费，更重要的是避免冷媒较少的室内机制热效果差的弊端，使得每个室内机的制热效果均好，促进多联式空调机组的推广和应用。 After the air conditioner unit has been running for a period of time, it can increase the refrigerant flow rate of the indoor unit with the least refrigerant and decrease the refrigerant flow rate of the indoor unit with the largest refrigerant at regular intervals, that is, balance the refrigerant flow rate of the two indoor units with the most serious bias flow. In this way, after multiple adjustments, the phenomenon of bias flow can be effectively alleviated and improved, so that the amount of refrigerant in each indoor unit can be balanced, avoiding waste caused by indoor units with more refrigerant, and more importantly, avoiding the disadvantages of poor thermal effects of indoor units with less refrigerant , so that the heating effect of each indoor unit is good, and promote the promotion and application of multi-connected air-conditioning units.
作为改进，步骤a所述的一段时间是指10~30分钟，即压缩机运行10~30分钟后开始调节偏流现象，因为该多联式空调机组运行一段时间后，才开始出现偏流现象的，通过试验证明，10~30分钟这个时间段开始调节较准确，太早调节，根本不会出现偏流，没必要调节，太晚调节的话偏流导致的制热效果差已经造成不良影响了。 As an improvement, the period of time mentioned in step a refers to 10 to 30 minutes, that is, the bias flow phenomenon starts to be adjusted after the compressor runs for 10 to 30 minutes, because the bias flow phenomenon begins to appear after the multi-connected air conditioner unit has been running for a period of time. It has been proved by experiments that it is more accurate to start the adjustment in the time period of 10-30 minutes. If the adjustment is too early, there will be no bias current at all, and there is no need to adjust it. If the adjustment is too late, the poor heating effect caused by the bias current has already caused adverse effects.
作为再改进，步骤a所述的一段时间是指15分钟，即压缩机运行15分钟后开始调节偏流现象，通过反复试验证明，15分钟这个时间点最准确，太早调节，根本不会出现偏流，没必要调节，太晚调节的话偏流导致的制热效果差已经造成不良影响了。 As a further improvement, the period of time mentioned in step a refers to 15 minutes, that is, the compressor starts to adjust the bias flow phenomenon after 15 minutes of operation. It has been proved through repeated experiments that the time point of 15 minutes is the most accurate, and if it is adjusted too early, there will be no bias flow at all. , there is no need to adjust, if the adjustment is too late, the poor heating effect caused by the bias flow has already caused adverse effects.
作为还改进，步骤d所述的开度减小是指，用原来的开度乘以0.9~0.95之间的任何一个数；步骤d所述的开度增大是指，用原来的开度乘以1.05~1.1之间的任何一个数；通过试验证明，原来开度乘以0.9~0.95这个范围内的任何一个数来调小冷媒最多的室内机，效果较理想；同样，原来开度乘以1.05~1.1这个范围内的任何一个数来增大冷媒较少的室内机，效果较理想。 As a further improvement, the reduction of the opening described in step d refers to multiplying any number between 0.9 and 0.95 by the original opening; the increase of the opening described in step d refers to using the original opening multiplied by any number between 1.05 and 1.1; it has been proved by experiments that the original opening multiplied by any number within the range of 0.9~0.95 to reduce the indoor unit with the most refrigerant, the effect is ideal; similarly, the original opening multiplied by Use any number within the range of 1.05~1.1 to increase the indoor unit with less refrigerant, and the effect is ideal.
作为进一步改进，步骤d所述的开度减小是指，用原来的开度乘以0.95；步骤d所述的开度增大是指，用原来的开度乘以1.05；通过反复试验证明，原来开度的0.95来调小冷媒最多的室内机，效果最理想；同样，原来开度的1.05来增大冷媒较少的室内机，效果最理想。 As a further improvement, the reduction of the opening described in step d refers to multiplying the original opening by 0.95; the increasing of the opening described in step d refers to multiplying the original opening by 1.05; it is proved by repeated experiments , the original opening is 0.95 to reduce the indoor unit with the most refrigerant, the effect is the best; similarly, the original opening is 1.05 to increase the indoor unit with less refrigerant, the effect is the best.
作为进一步改进，步骤e所述的一段时间是指10~30秒，即每次调节的间隔为10~30秒范围内的任意一个时间，对偏流的调节效果较好，这是经过试验得出的，如果调节太频繁，没有必要；如果调节次数太少，对偏流调节的力度不够。 As a further improvement, the period of time described in step e refers to 10 to 30 seconds, that is, the interval of each adjustment is any time within the range of 10 to 30 seconds, and the effect of adjusting the bias current is better. This is obtained through experiments. Yes, if the adjustment is too frequent, it is not necessary; if the number of adjustments is too small, the intensity of bias current adjustment is not enough.
作为还进一步改进，步骤e所述的一段时间是指15秒，即每间隔15秒调节一次，对偏流的调节效果最好，这是经过反复试验得出的，如果调节太频繁，没有必要；如果调节次数太少，对偏流调节的力度不够。 As a further improvement, the period of time described in step e refers to 15 seconds, that is, it is adjusted every 15 seconds, and the adjustment effect on the bias current is the best. This is obtained through repeated trials. If the adjustment is too frequent, it is not necessary; If the number of adjustments is too small, the intensity of bias current adjustment is not enough.
附图说明 Description of drawings
图1是本发明多联式空调机组制热时防止冷媒偏流的控制方法的系统原理图。 Fig. 1 is a system schematic diagram of the control method for preventing refrigerant bias flow when the multi-connected air conditioner unit is heating according to the present invention.
图中所示 1、压缩机，2、室内换热器，3、温度传感器，4、内机电子膨胀阀。 As shown in the figure 1. Compressor, 2. Indoor heat exchanger, 3. Temperature sensor, 4. Internal electronic expansion valve. the
具体实施方式 Detailed ways
下面结合附图和具体实施例对本发明作进一步说明。 The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
如图1所示，本发明多联式空调机组制热时防止冷媒偏流的控制方法，其具体步骤如下： As shown in Figure 1, the control method of the present invention to prevent the refrigerant from drifting when the multi-connected air conditioner unit is heating, the specific steps are as follows:
a、将室外机的压缩机1开机运行一段时间，具体是指，该多联式空调机组的任何一个室外机的压缩机开机运行一段时间。 a. Start and run the compressor 1 of the outdoor unit for a period of time, specifically, start and run the compressor 1 of any outdoor unit of the multi-connected air conditioner unit for a period of time.
步骤a所述的一段时间是指10~30分钟，优选15分钟。 The period of time described in step a refers to 10 to 30 minutes, preferably 15 minutes.
b、通过每个室内机的室内换热器2中部的温度传感器3测量每个室内机的室内换热器2中部的温度T0，将测温结果发送给空调主控制器，室内换热器2中部的温度T0最高的室内机为冷媒最多的室内机，室内换热器2中部的温度T0最低的室内机为冷媒最少的室内机。
b. Measure the temperature T 0 in the middle of the indoor heat exchanger 2 of each indoor unit through the
该步骤中的室内换热器2中部的具体位置是指，室内换热器2中的盘管的长度中间点，该步骤中的温度传感器就位于该位置，测量出的该位置的温度值即T0。 The specific position of the middle part of the indoor heat exchanger 2 in this step refers to the middle point of the length of the coil in the indoor heat exchanger 2. The temperature sensor in this step is located at this position, and the measured temperature value at this position is T 0 .
c、通过冷媒最少的室内机的室内换热器2的出口的温度传感器3测量该室内机的室内换热器2的出口的温度T1min，通过冷媒最多的室内机的室内换热器2的出口的温度传感器3测量该室内机的室内换热器2的出口的温度T1max，将上述两个温度值传给空调主控制器，并计算出T1max减去T1min的差值△T。
c. The
d、判断△T是否大于或等于5，如果是，则将冷媒最少的室内机的内机电子膨胀阀4的开度增大，同时将冷媒最多的室内机的内机电子膨胀阀4的开度减小；如果否，则不进行调节。 d. Determine whether △T is greater than or equal to 5. If so, increase the opening degree of the electronic expansion valve 4 of the indoor unit with the least refrigerant, and at the same time increase the opening degree of the electronic expansion valve 4 of the indoor unit with the largest refrigerant. decrease; if not, no adjustment is made.
步骤d所述的开度减小是指，用原来的开度乘以0.9~0.95之间的任何一个数，优选乘以0.95；步骤d所述的开度增大是指，用原来的开度乘以1.05~1.1之间的任何一个数，优选乘以1.05，如制热模式时，各室内机的内机电子膨胀阀4的开度一般都为350步，那么，冷媒较少需要增大开度的室内机的内机电子膨胀阀4的开度为350步乘以1.05，大致是368步，而冷媒较多需要减小开度的室内电子膨胀阀4的开度为120步乘以0.95，大致是332步。 The reduction of the opening described in step d refers to multiplying the original opening by any number between 0.9 and 0.95, preferably by 0.95; the increasing of the opening described in step d refers to multiplying the original opening degree multiplied by any number between 1.05~1.1, preferably multiplied by 1.05, for example, in the heating mode, the opening degree of the electronic expansion valve 4 of each indoor unit is generally 350 steps, so the refrigerant needs to be increased less The opening of the indoor electronic expansion valve 4 of the indoor unit with a large opening is 350 steps multiplied by 1.05, which is roughly 368 steps, while the opening of the indoor electronic expansion valve 4 with more refrigerant needs to be reduced is 120 steps multiplied by 1.05. With 0.95, that's roughly 332 steps.
e、每间隔一段时间，重复步骤b~d，直至停机，该步骤中的间隔一段时间优选间隔10~30秒这个范围内的任意一个时间，优选15秒。 e. Repeat steps b to d at intervals until the machine is shut down. The interval in this step is preferably any time within the range of 10 to 30 seconds, preferably 15 seconds.
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