CN107289576B - Defrosting control method for air conditioner - Google Patents
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Abstract
Description
技术领域technical field
本发明属于空调技术领域,具体涉及一种空调器除霜控制方法。The invention belongs to the technical field of air conditioners, and in particular relates to a defrosting control method for an air conditioner.
背景技术Background technique
空调器作为一种能够调节室内环境温度的设备,其工作原理为:通过制冷剂在在循环管路之间通过高压/低压/气态/液态的状态转换来使室内环境温度降低或者升高,即从室内机的角度来看,空调器处于制冷或者制热工况。在空调器处于制热工况的情形下,空调室外机(蒸发器)的盘管上容易结霜,室外机盘管结霜会导致制冷系统的性能下降,从而影响空调器的制热效果,降低室内环境的舒适性,影响用户体验。因此,在空调器处于制热工况的情形下,需要对空调器的室外机盘管进行及时而有效的除霜。As a device that can adjust the indoor ambient temperature, the air conditioner works as follows: the indoor ambient temperature is lowered or raised by the refrigerant passing through the high-pressure/low-pressure/gaseous/liquid state transition between the circulation pipes, that is, From the perspective of the indoor unit, the air conditioner is in cooling or heating mode. When the air conditioner is in heating mode, frost is easy to form on the coil of the outdoor unit (evaporator) of the air conditioner, and the frost on the coil of the outdoor unit will reduce the performance of the refrigeration system, thereby affecting the heating effect of the air conditioner. Reduce the comfort of the indoor environment and affect the user experience. Therefore, when the air conditioner is in the heating condition, it is necessary to timely and effectively defrost the outdoor unit coil of the air conditioner.
为解决空调器的结霜问题,现有技术中一般采用制冷除霜(使四通阀换向,逆循环)或者旁通除霜(从压缩机的高压端单独引出回路至空调室外机)的方式对空调室外机进行除霜。其中,采用制冷除霜方式时室内的环境温度会明显地下降,从而降低空调的制热效果,影响室内环境的舒适性,即牺牲了用户体验。采用旁通除霜方式时冷媒会继续进入空调室内机中进行制热,即,可以使空调器仍然维持在制热工况,因此旁通除霜方式近年来得到了广泛的应用。在除霜方式确定的基础上,为了保证室内环境的制热效率不受影响,应当尽可能避免假除霜(满足除霜条件,但由于空气的湿度比较低等原因,此时的机组实际并没有结霜)或者除霜过度(满足继续除霜的条件,但由于空气的温度比较高等原因,此时的机组实际已经完成除霜)的次数。鉴于此,选择合适的除霜时机显得至关重要。目前的除霜方法通常需要引入环境温度,如可以通过设定几个室外环境温度的区间,在每个区间设定一个固定的温差(环境温度与室外机盘管温度的差值)来判断是否使空调器进入除霜模式。但是,这种方式在进入除霜的时机判断上会有误差,往往会出现假除霜或者除霜过度的现象。In order to solve the frosting problem of the air conditioner, in the prior art, refrigeration defrosting (reversing the direction of the four-way valve, reverse circulation) or bypass defrosting (extracting the circuit from the high pressure end of the compressor to the outdoor unit of the air conditioner) is generally used. way to defrost the outdoor unit of the air conditioner. Among them, when the refrigeration and defrosting method is adopted, the indoor ambient temperature will drop significantly, thereby reducing the heating effect of the air conditioner, affecting the comfort of the indoor environment, that is, sacrificing the user experience. When the bypass defrosting method is adopted, the refrigerant will continue to enter the indoor unit of the air conditioner for heating, that is, the air conditioner can still be maintained in the heating condition. Therefore, the bypass defrosting method has been widely used in recent years. Based on the determination of the defrosting method, in order to ensure that the heating efficiency of the indoor environment is not affected, false defrosting should be avoided as much as possible (the defrosting conditions are met, but due to reasons such as low air humidity, the unit at this time does not actually Frosting) or excessive defrosting (the conditions for continuing defrosting are met, but due to the relatively high air temperature, the unit has actually completed defrosting at this time). In view of this, it is very important to choose the right defrosting timing. The current defrosting method usually needs to introduce the ambient temperature. For example, it can be determined by setting several outdoor ambient temperature intervals and setting a fixed temperature difference (the difference between the ambient temperature and the outdoor unit coil temperature) in each interval. Put the air conditioner into defrost mode. However, this method will have errors in judging the timing of entering the defrosting, and often there will be false defrosting or excessive defrosting.
因此,本领域需要一种新的除霜控制方法来解决上述问题。Therefore, there is a need in the art for a new defrosting control method to solve the above problems.
发明内容SUMMARY OF THE INVENTION
为了解决现有技术中的上述问题,即为了更准确地判断进入除霜的时机,本发明提出了一种空调器除霜控制方法,该空调器除霜控制方法包括下列步骤:在空调器处于制热工况的情形下,检测室外机盘管温度;每隔第一预设时间获取一次室外机盘管温度的衰减值;计算获取的室外机盘管温度的衰减值之间的差值;获取室外机所在位置的相对湿度;基于所述室外机所在位置的相对湿度,根据所述室外机盘管温度的衰减值之间的差值,判断是否使空调器进入除霜模式。In order to solve the above-mentioned problems in the prior art, that is, in order to more accurately determine the timing of entering the defrosting process, the present invention proposes a defrosting control method for an air conditioner. The air conditioner defrosting control method includes the following steps: when the air conditioner is in In the case of the heating condition, the temperature of the outdoor unit coil is detected; the attenuation value of the outdoor unit coil temperature is obtained every first preset time; the difference between the obtained outdoor unit coil temperature attenuation values is calculated; Obtain the relative humidity of the location of the outdoor unit; based on the relative humidity of the location of the outdoor unit, and according to the difference between the attenuation values of the coil temperature of the outdoor unit, determine whether to put the air conditioner into the defrost mode.
在上述空调器除霜控制方法的优选实施方式中,“基于所述室外机所在位置的相对湿度,根据所述室外机盘管温度的衰减值之间的差值,判断是否使空调器进入除霜模式”的步骤具体包括:判断所述室外机所在位置的相对湿度是否大于预设湿度阈值,在所述室外机所在位置的相对湿度大于所述预设湿度阈值的情形下,如果所述室外机盘管温度的衰减值之间的差值大于第一设定阈值,则使所述空调器进入除霜模式,否则,不进入除霜模式;在所述室外机所在位置的相对湿度不大于所述预设湿度阈值的情形下,如果所述室外机盘管温度的衰减值之间的差值大于第二设定阈值,则使所述空调器进入除霜模式,否则,不进入除霜模式;In a preferred embodiment of the above air conditioner defrosting control method, "based on the relative humidity of the location where the outdoor unit is located, according to the difference between the attenuation values of the coil temperature of the outdoor unit, it is judged whether to make the air conditioner enter the defrosting mode. The step of "frost mode" specifically includes: judging whether the relative humidity of the location where the outdoor unit is located is greater than a preset humidity threshold, and in the case where the relative humidity of the location where the outdoor unit is located is greater than the preset humidity threshold, if the outdoor unit is located If the difference between the attenuation values of the unit coil temperature is greater than the first set threshold, the air conditioner will enter the defrost mode, otherwise, the defrost mode will not be entered; the relative humidity at the location of the outdoor unit is not greater than In the case of the preset humidity threshold value, if the difference between the attenuation values of the outdoor unit coil temperature is greater than the second preset threshold value, the air conditioner will enter the defrost mode, otherwise, the defrost mode will not be entered. model;
在上述空调器除霜控制方法的优选实施方式中,所述预设湿度阈值为60%-80%内的任意值。In a preferred embodiment of the above air conditioner defrosting control method, the preset humidity threshold is any value within 60%-80%.
在上述空调器除霜控制方法的优选实施方式中,所述第一预设时间为10-20秒范围内的任意值。In a preferred embodiment of the above air conditioner defrosting control method, the first preset time is any value within the range of 10-20 seconds.
在上述空调器除霜控制方法的优选实施方式中,所述预设湿度阈值为70%,所述第一预设时间为15秒。In a preferred embodiment of the above air conditioner defrosting control method, the preset humidity threshold is 70%, and the first preset time is 15 seconds.
在上述空调器除霜控制方法的优选实施方式中,,所述第二设定阈值大于所述第一设定阈值,并且/或者所述第一设定阈值为1摄氏度,所述第二设定阈值为2摄氏度。In a preferred embodiment of the above air conditioner defrosting control method, the second set threshold is greater than the first set threshold, and/or the first set threshold is 1 degree Celsius, and the second set threshold is The set threshold is 2 degrees Celsius.
在上述空调器除霜控制方法的优选实施方式中,所述除霜控制方法还包括判断是否退出除霜模式的步骤,该步骤包括:在所述空调器进入除霜模式之后,比较所述室外机盘管温度与第三设定阈值;根据比较结果,判断是否退出除霜模式。In a preferred embodiment of the above air conditioner defrosting control method, the defrosting control method further includes a step of judging whether to exit the defrosting mode, the step including: after the air conditioner enters the defrosting mode, comparing the outdoor The temperature of the machine coil and the third set threshold; according to the comparison result, it is judged whether to exit the defrost mode.
在上述空调器除霜控制方法的优选实施方式中,“根据比较结果,判断是否退出除霜模式”的步骤进一步包括:在所述室外机盘管温度大于所述第三设定阈值的情形下,判断该状态的持续时间是否大于第二预设时间,如果该状态的持续时间大于所述第二预设时间,则使所述空调器退出除霜模式;如果该状态的持续时间不大于所述第二预设时间,则使所述空调器维持所述除霜工况。In a preferred embodiment of the above air conditioner defrosting control method, the step of "judging whether to exit the defrosting mode according to the comparison result" further includes: in the case that the temperature of the outdoor unit coil is greater than the third set threshold , judge whether the duration of the state is greater than the second preset time, if the duration of the state is greater than the second preset time, the air conditioner will exit the defrosting mode; if the duration of the state is not greater than the If the second preset time is set, the air conditioner is maintained in the defrosting condition.
在上述空调器除霜控制方法的优选实施方式中,所述第三设定阈值为6-10摄氏度范围内的任意值;并且/或者所述第二预设时间为30-60秒范围内的任意值。In a preferred embodiment of the above air conditioner defrosting control method, the third preset threshold is any value within the range of 6-10 degrees Celsius; and/or the second preset time is within the range of 30-60 seconds any value.
在上述空调器除霜控制方法的优选实施方式中,所述除霜模式为通过导通旁通支路的方式对室外机盘管进行除霜的旁通除霜模式;并且/或者“获取室外机所在位置的相对湿度”的步骤具体包括获取室外机出风口处的相对湿度。In a preferred embodiment of the above air conditioner defrosting control method, the defrosting mode is a bypass defrosting mode in which the outdoor unit coil is defrosted by turning on the bypass branch; The step of obtaining the relative humidity at the air outlet of the outdoor unit specifically includes obtaining the relative humidity at the air outlet of the outdoor unit.
在本发明的技术方案中,基于室外机所在位置的相对湿度,根据室外机盘管温度的衰减值之间的差值来判断是否使空调器进入除霜模式。具体地,发明人多年潜心研究发现,随着室外机盘管结霜越来越多,室外机盘管的温度会出现大幅度的衰减,并且这种衰减随着霜层厚度的增大而呈加速的趋势。因此,获取室外机盘管温度的衰减值之间的差值相当于获取了室外机盘管温度的衰减加速度,与单纯的衰减值或衰减速度相比,通过衰减加速度可以更准确地判断室外机盘管的结霜水平。在此基础上,考虑到相对湿度对空调器结霜的影响,即当室外机所在位置的相对湿度不同时,室外机盘管的温度衰减速度对应的室外机结霜量也不同,因此,加入相对湿度的判断条件后,再利用室外机盘管温度的衰减值之间的差值判断进入除霜时机时,能够更准确地选择除霜时机,有效避免假除霜现象。此外,本发明在进行除霜时,选择旁通除霜的方式,这样一来,在旁通除霜的过程中,压缩机不停机,四通阀也不换向,空调器不间断地进行制热,可极大地保证空调器的制热效果,最大程度地减小室内温度的波动。In the technical solution of the present invention, based on the relative humidity of the location where the outdoor unit is located, it is determined whether to enter the defrost mode of the air conditioner according to the difference between the attenuation values of the coil temperature of the outdoor unit. Specifically, the inventor has found that, as more and more frost is formed on the outdoor unit coil, the temperature of the outdoor unit coil will be greatly attenuated, and this attenuation will accelerate with the increase of the thickness of the frost layer. the trend of. Therefore, obtaining the difference between the attenuation values of the outdoor unit coil temperature is equivalent to obtaining the attenuation acceleration of the outdoor unit coil temperature. Compared with the simple attenuation value or attenuation speed, the outdoor unit can be more accurately judged by the attenuation acceleration. Frost level of the coil. On this basis, considering the influence of relative humidity on the frosting of the air conditioner, that is, when the relative humidity of the location of the outdoor unit is different, the amount of frosting of the outdoor unit corresponding to the temperature decay rate of the outdoor unit coil is also different. Therefore, adding After determining the relative humidity, the difference between the attenuation values of the outdoor unit coil temperature can be used to determine the defrosting timing, which can more accurately select the defrosting timing and effectively avoid false defrosting. In addition, when defrosting is performed in the present invention, a bypass defrosting method is selected. In this way, in the process of bypass defrosting, the compressor does not stop, the four-way valve does not change direction, and the air conditioner operates continuously. Heating can greatly ensure the heating effect of the air conditioner and minimize the fluctuation of indoor temperature.
附图说明Description of drawings
图1是现有空调器的结构示意图;Fig. 1 is the structural representation of the existing air conditioner;
图2是本发明的空调器除霜控制方法的主要步骤流程图;Fig. 2 is the main step flow chart of the air conditioner defrosting control method of the present invention;
图3是本发明一个实施例的空调器的结构示意图;3 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;
图4是本发明的空调器除霜控制方法的具体步骤流程图。FIG. 4 is a flow chart of the specific steps of the defrosting control method for the air conditioner of the present invention.
具体实施方式Detailed ways
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。例如,尽管本申请中按照特定顺序描述了本发明的方法的各个步骤,但是这些顺序并不是限制性的,在不偏离本发明的基本原理的前提下,本领域技术人员可以按照不同的顺序来执行所述步骤。Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principle of the present invention, and are not intended to limit the protection scope of the present invention. For example, although the various steps of the method of the present invention are described in this application in a specific order, these orders are not limiting, and those skilled in the art may perform different orders without departing from the basic principles of the present invention. Perform the described steps.
基于背景技术中提出的进入除霜的时机问题,本发明提出了一种空调器的除霜控制方法,旨在使空调器在合适的除霜时机进入除霜模式,避免出现假除霜、除霜过度等现象,从而尽可能地减少甚至避免由于除霜而导致的空调制热效果降低现象。Based on the timing problem of entering defrosting proposed in the background art, the present invention proposes a defrosting control method for an air conditioner, which aims to make the air conditioner enter the defrosting mode at a suitable defrosting time to avoid false defrosting and defrosting. Over-frost and other phenomena, so as to minimize or even avoid the reduction of air-conditioning heating effect caused by defrosting.
首先参阅图1,该图是现有空调器的结构示意图。如图1所示,空调器主要包括室外机1、室内机2、压缩机3、四通阀4以及节流装置5。对于本领域技术人员而言,空调器的结构属于熟知技术,在此不再详细描述。First, please refer to FIG. 1 , which is a schematic structural diagram of a conventional air conditioner. As shown in FIG. 1 , the air conditioner mainly includes an outdoor unit 1 , an
下面参阅图2,本发明的除霜控制方法包括下列步骤:S110,在空调器处于制热工况的情形下,检测室外机盘管温度;S120,每隔第一预设时间获取一次室外机盘管温度的衰减值;S130,计算获取的室外机盘管温度的衰减值之间的差值;S140,获取室外机所在位置的相对湿度;S150,基于室外机所在位置的相对湿度,根据室外机盘管温度的衰减值之间的差值,判断是否使空调器进入除霜模式。2, the defrosting control method of the present invention includes the following steps: S110, when the air conditioner is in a heating condition, detecting the temperature of the coil of the outdoor unit; S120, obtaining an outdoor unit every first preset time Attenuation value of the coil temperature; S130, calculate the difference between the obtained attenuation values of the coil temperature of the outdoor unit; S140, obtain the relative humidity of the location of the outdoor unit; S150, based on the relative humidity of the location of the outdoor unit, according to the outdoor unit The difference between the attenuation values of the unit coil temperature is used to determine whether to put the air conditioner into defrost mode.
关于相对湿度的说明,相对湿度,表示空气中的绝对湿度与同温度下的饱和绝对湿度的比值,得数是一个百分比。(也就是指某湿空气中所含水蒸气的质量与同温度下饱和空气中所含水蒸气的质量之比,这个比值用百分数表示)。相对湿度用RH表示。相对湿度的定义是单位体积空气内实际所含的水气密度(用d1表示)和同温度下饱和水气密度(用d2表示)的百分比,即RH(%)=d1/d2x 100%;另一种计算方法是:实际的空气水气压强(用p1表示)和同温度下饱和水气压强(用p2表示)的百分比,即RH(%)=p1/p2x 100%。在本实施例中,可以通过在室外机上设置一个湿度传感器来获取室外机所在位置的相对湿度。A description of relative humidity, relative humidity, expresses the ratio of the absolute humidity in the air to the saturated absolute humidity at the same temperature, and the number is a percentage. (That is, the ratio of the mass of water vapor contained in a humid air to the mass of water vapor contained in saturated air at the same temperature, and this ratio is expressed as a percentage). Relative humidity is expressed in RH. The definition of relative humidity is the percentage of water vapor density (represented by d1) actually contained in unit volume of air and saturated water vapor density (represented by d2) at the same temperature, that is, RH (%)=d1/d2x 100%; A calculation method is: the percentage of the actual air water pressure (represented by p1) and the saturated water pressure (represented by p2) at the same temperature, that is, RH(%)=p1/p2x 100%. In this embodiment, the relative humidity of the location where the outdoor unit is located may be acquired by arranging a humidity sensor on the outdoor unit.
在上述步骤S110-S150中,在判断是否使空调进入除霜模式时,首先判断室外机所在位置的相对湿度,然后依据该相对湿度的值,再根据室外机盘管温度的衰减值之间的差值来判断是否对室外机盘管进行除霜。具体而言,发明人多年潜心研究发现,随着室外机盘管结霜越来越多,随着室外机盘管结霜越来越多,室外机盘管的温度会出现大幅度的衰减,并且这种衰减随着霜层厚度的增大而呈加速的趋势。也就是说,随着霜层厚度的增大,室外机盘管在预设时间的内衰减值会越来越大,因此,通过判断室外机盘管温度的衰减值之间的差值大小,可以准确地判断出室外机的结霜程度。在此基础上,考虑到相对湿度对空调器结霜的影响,即当室外机所在位置的相对湿度不同时,室外机盘管的温度衰减速度对应的室外机的结霜量也不同,因此,加入相对湿度的判断条件后,再利用室外机盘管温度衰减值之间的差值判断进入除霜时机时,能够更准确地选择除霜时机,有效避免假除霜现象。本领域技术人员能够理解的是,在加入相对湿度的前提下,仅根据衰减速度来判断是否进入除霜时,如果空调器在运行过程中由于自身或外界的变化而出现在某一时刻的衰减速度达到进入除霜的时机,而紧接着又再此恢复正常(即这一时刻的衰减速度的变化属于异常变化),那么此时根据这一时刻的衰减速度使空调器进入除霜,会造成假除霜现象。而空调器运行过程中,如果出现多次这种情形,则会造成频繁除霜。为了避免这一情况,本发明在加入相对湿度的前提下,通过室外机盘管温度的衰减值之间的差值来判断是否对室外机盘管进行除霜,可以准确地判断出室外机的结霜程度,从而更准确地选择除霜时机,有效避免瞬时结霜导致的假除霜现象。In the above steps S110-S150, when judging whether to put the air conditioner into the defrosting mode, first determine the relative humidity of the location where the outdoor unit is located, then according to the value of the relative humidity, and then according to the difference between the attenuation values of the coil temperature of the outdoor unit The difference is used to judge whether to defrost the outdoor unit coil. Specifically, the inventor has found that the temperature of the outdoor unit coil will be greatly attenuated as more and more frost is formed on the outdoor unit coil, and the temperature of the outdoor unit coil will be greatly reduced. The attenuation tends to accelerate with the increase of frost thickness. That is to say, as the thickness of the frost layer increases, the attenuation value of the outdoor unit coil will become larger and larger within the preset time. Therefore, by judging the difference between the attenuation values of the outdoor unit coil temperature, The degree of frost formation on the outdoor unit can be accurately judged. On this basis, considering the effect of relative humidity on the frosting of the air conditioner, that is, when the relative humidity of the location of the outdoor unit is different, the amount of frosting of the outdoor unit corresponding to the temperature decay speed of the outdoor unit coil is also different. Therefore, After adding the judgment condition of relative humidity, the difference between the temperature attenuation values of the outdoor unit coil is used to judge the defrosting timing, which can more accurately select the defrosting timing and effectively avoid the false defrosting phenomenon. Those skilled in the art can understand that, under the premise of adding relative humidity, when judging whether to enter the defrosting process only based on the decay speed, if the air conditioner decays at a certain moment due to changes in itself or the outside world during the operation of the air conditioner If the speed reaches the time to enter the defrosting, and then returns to normal again (that is, the change in the decay speed at this moment is an abnormal change), then according to the decay speed at this moment, the air conditioner enters the defrost, which will cause False defrost phenomenon. During the operation of the air conditioner, if this happens many times, it will cause frequent defrosting. In order to avoid this situation, the present invention determines whether to defrost the outdoor unit coil by the difference between the attenuation values of the outdoor unit coil temperature under the premise of adding relative humidity, so that the outdoor unit coil can be accurately determined. Therefore, the defrosting timing can be selected more accurately, and the false defrosting phenomenon caused by instantaneous frost can be effectively avoided.
下面对上述步骤S110-S150作进一步详细描述。The above steps S110-S150 will be described in further detail below.
在步骤S110中,可以通过设置在室外机盘管的温度传感器实时检测室外机盘管温度,也可以通过其他已知的手段获取室外机盘管温度,这些都不脱离本发明的保护范围。In step S110, the temperature of the outdoor unit coil may be detected in real time by a temperature sensor disposed on the outdoor unit coil, or the temperature of the outdoor unit coil may be obtained by other known means, all without departing from the protection scope of the present invention.
在步骤S120中,优选地,第一预设时间可以为10-20秒范围内的任意值。例如,可以将第一预设时间设置为10秒、15秒、20秒等,本领域技术人员可以根据实际应用场景选择适宜的第一预设时间。在本发明的优选实施例中,第一预设时间为15秒,即每隔15秒获取一次室外机盘管的温度。那么,室外机盘管温度在15秒内的的衰减值ΔT=Ti-Ti+1。In step S120, preferably, the first preset time can be any value within the range of 10-20 seconds. For example, the first preset time can be set to 10 seconds, 15 seconds, 20 seconds, etc., and those skilled in the art can select an appropriate first preset time according to the actual application scenario. In a preferred embodiment of the present invention, the first preset time is 15 seconds, that is, the temperature of the outdoor unit coil is acquired every 15 seconds. Then, the attenuation value of the outdoor unit coil temperature within 15 seconds ΔT=T i -T i+1 .
在步骤S130中,基于步骤S120中得到的室外机盘管温度的衰减值,30秒内可以获取的室外机外盘管为ΔT1和ΔT2。其差值N=ΔT1-ΔT2。In step S130, based on the attenuation value of the outdoor unit coil temperature obtained in step S120, the outdoor unit outer coils that can be obtained within 30 seconds are ΔT 1 and ΔT 2 . The difference N=ΔT 1 −ΔT 2 .
在步骤S140中,通过在室外机上设置湿度传感器来获取室外机所在位置的相对湿度值。相对湿度用HR表示。在本实施例中,将湿度传感器设置于室外机出风口处,获取室外机出风口处的相对湿度,并将该室外机出风口处的相对湿度作为判断除霜时机的一个依据。In step S140, the relative humidity value of the location where the outdoor unit is located is acquired by setting a humidity sensor on the outdoor unit. Relative humidity is expressed in HR. In this embodiment, a humidity sensor is set at the air outlet of the outdoor unit to obtain the relative humidity at the air outlet of the outdoor unit, and the relative humidity at the air outlet of the outdoor unit is used as a basis for judging the defrosting timing.
在步骤S150中,基于室外机出风口处的相对湿度,根据室外机盘管温度的衰减值之间的差值,判断是否使空调器进入除霜模式。举例而言,在HR>70%的情形下,判断室外机盘管温度的衰减值之间的差值是否大于第一设定阈值,如果室外机盘管温度的衰减值之间的差值大于该第一设定阈值,则使空调器进入除霜模式;如果室外机盘管温度的衰减值之间的差值不大于第一设定阈值,则使空调器维持制热工况,不进入除霜模式。优选地,第一设定阈值为1摄氏度。那么,该情形(HR>70%)下,当室外机盘管温度的衰减值之间的差值N=ΔT1-ΔT2>1摄氏度时,进入除霜模式。否则,即N不大于1摄氏度,则说明空调器还没有达到最佳的除霜时机,使空调器维持制热工况,不进入除霜模式。In step S150, based on the relative humidity at the air outlet of the outdoor unit and the difference between the attenuation values of the coil temperature of the outdoor unit, it is determined whether to put the air conditioner into the defrosting mode. For example, in the case of HR>70%, determine whether the difference between the attenuation values of the outdoor unit coil temperature is greater than the first set threshold, if the difference between the attenuation values of the outdoor unit coil temperature is greater than The first set threshold, the air conditioner will enter the defrosting mode; if the difference between the attenuation values of the outdoor unit coil temperature is not greater than the first set threshold, the air conditioner will maintain the heating condition and not enter Defrost mode. Preferably, the first set threshold is 1 degree Celsius. Then, in this case (HR>70%), when the difference between the attenuation values of the outdoor unit coil temperature is N=ΔT 1 -ΔT 2 >1 degree Celsius, the defrosting mode is entered. Otherwise, that is, N is not greater than 1 degree Celsius, it means that the air conditioner has not reached the optimal defrosting time, so that the air conditioner maintains the heating condition and does not enter the defrosting mode.
在HR≤70%的情形下,判断室外机盘管温度的衰减值之间的差值是否大于第二设定阈值,如果室外机盘管温度的衰减值之间的差值大于该第二设定阈值,则使空调器进入除霜模式;如果室外机盘管温度的衰减值之间的差值不大于第二设定阈值,则使空调器维持制热工况,不进入除霜模式。优选地,第二设定阈值为2摄氏度。那么,该情形(HR>70%)下,当室外机盘管温度的衰减值之间的差值N=ΔT1-ΔT2>2摄氏度时,进入除霜模式。否则,即N不大于2摄氏度,则说明空调器还没有达到最佳的除霜时机,使空调器维持制热工况,不进入除霜模式。In the case of HR≤70%, judge whether the difference between the attenuation values of the outdoor unit coil temperature is greater than the second set threshold, if the difference between the attenuation values of the outdoor unit coil temperature is greater than the second set threshold If the difference between the attenuation values of the outdoor unit coil temperature is not greater than the second set threshold, the air conditioner will maintain the heating condition and not enter the defrost mode. Preferably, the second set threshold is 2 degrees Celsius. Then, in this case (HR>70%), when the difference between the attenuation values of the outdoor unit coil temperature is N=ΔT 1 -ΔT 2 >2 degrees Celsius, the defrosting mode is entered. Otherwise, that is, N is not greater than 2 degrees Celsius, it means that the air conditioner has not reached the optimal defrosting time, so that the air conditioner maintains the heating condition and does not enter the defrosting mode.
需要说明的是,虽然上述中的第一设定阈值为1,第二设定阈值为2,但是本领域技术人员可以根据实际应用场景设定其他合适的阈值,如第一设定阈值设置为1.5摄氏度,第二设定阈值设定为2.5摄氏度等。由于第一设定阈值的设定(HR>70%时)和第二设定阈值的设定(HR≤70%时)都是依据相对湿度设定的,相对湿度较大时,结霜也相对容易,因此,通常情况下第一设定阈值要小于第二设定阈值,从而实现更准确地判断进入除霜时机的目的。此外,上文中的相对湿度的值也可以根据空调器的具体使用场景来设定。It should be noted that although the first set threshold is 1 and the second set threshold is 2, those skilled in the art can set other suitable thresholds according to actual application scenarios, for example, the first set threshold is set to 1.5 degrees Celsius, the second set threshold is set to 2.5 degrees Celsius, etc. Since the setting of the first set threshold (when HR>70%) and the setting of the second set threshold (when HR≤70%) are both set based on relative humidity, when the relative humidity is high, frost will also occur. It is relatively easy, therefore, under normal circumstances, the first set threshold value is smaller than the second set threshold value, so as to achieve the purpose of more accurately judging the timing of entering the defrost. In addition, the value of the relative humidity above can also be set according to the specific usage scenario of the air conditioner.
综上所述,本发明通过检测室外机盘管温度和室外机出风口处的相对湿度,基于该相对湿度,根据室外机盘管温度的衰减值之间的差值,判断是否进入除霜模式。随着室外机盘管结霜越来越多,室外机盘管的温度会出现大幅度的衰减,并且这种衰减随着霜层厚度的增大而呈加速的趋势。因此,与获取室外机盘管温度的衰减速度(即预设时间内室外机盘管温度的衰减值)相比,通过获取室外机盘管温度的衰减值之间的差值,可以更准确地判断室外机盘管的结霜水平。在此基础上,考虑到相对湿度对空调器结霜的影响,即当室外机出风口处的相对湿度不同时,室外机盘管的温度衰减速度对应的室外机的结霜量也不同,因此,加入相对湿度的判断条件后,再利用室外机盘管温度衰减值之间的差值判断进入除霜时机时,能够更准确地选择除霜时机,有效避免假除霜现象。此外,还需要说明的是,上文中第一预设时间、第一设定阈值、第二设定阈值均可以根据实际的应用场景进行设定,也可以由用户自定义设置。To sum up, the present invention determines whether to enter the defrost mode by detecting the temperature of the coil of the outdoor unit and the relative humidity at the air outlet of the outdoor unit, based on the relative humidity and the difference between the attenuation values of the coil temperature of the outdoor unit. . As more and more frost is formed on the outdoor unit coil, the temperature of the outdoor unit coil will be greatly attenuated, and this attenuation will accelerate as the thickness of the frost layer increases. Therefore, compared with obtaining the decay speed of the outdoor unit coil temperature (that is, the decay value of the outdoor unit coil temperature within a preset time), by obtaining the difference between the decay values of the outdoor unit coil temperature, it is possible to obtain a more accurate Determine the frost level of the outdoor unit coil. On this basis, considering the influence of relative humidity on the frosting of the air conditioner, that is, when the relative humidity at the air outlet of the outdoor unit is different, the amount of frosting of the outdoor unit corresponding to the temperature decay speed of the outdoor unit coil is also different. , after adding the judgment condition of relative humidity, and then using the difference between the temperature attenuation values of the outdoor unit coil to judge the defrosting timing, the defrosting timing can be selected more accurately, and the false defrosting phenomenon can be effectively avoided. In addition, it should also be noted that the above-mentioned first preset time, first set threshold, and second set threshold may all be set according to actual application scenarios, and may also be set by the user.
此外,本发明的控制方法还包括判断是否退出除霜模式的步骤,该步骤具体包括下列子步骤:步骤一:在空调器进入除霜模式之后,比较室外机盘管温度与第三设定阈值;步骤二,根据比较结果,判断是否退出除霜模式。上述步骤一和步骤二的目的在于确定退出除霜的时机。由于除霜过程中,都会或多或少地降低空调的制热效果,从而影响室内环境的舒适性。因此,选择合适的时机退出除霜模式,能够在保证除霜效果的前提下,尽量缩短除霜时间,从而减少对空调制热效果的影响。In addition, the control method of the present invention also includes the step of judging whether to exit the defrosting mode, and this step specifically includes the following sub-steps: Step 1: After the air conditioner enters the defrosting mode, compare the temperature of the outdoor unit coil with the third set threshold ;
具体而言,第三设定阈值可以为6-10摄氏度范围内的任意值。在本发明的优选实施例中,第三设定阈值为8摄氏度。在除霜模式下,当检测到室外机盘管温度Ti>8摄氏度时,再判断室外机盘管温度Ti>8的状态的持续时间是否达到第二预设时间。第二预设时间可以为30-60秒范围内的任意值。在本发明的优选实施例中,第二预设时间为40秒,那么,当室外机盘管温度Ti>8的状态持续40秒以上时,则判断除霜已经完成,此时选择退出除霜。当室外机盘管温度Ti不大于8,或者室外机盘管温度Ti大于8但是持续时间未超过40秒,均判断为未完成除霜,此时继续除霜模式。Specifically, the third set threshold may be any value within the range of 6-10 degrees Celsius. In a preferred embodiment of the present invention, the third set threshold is 8 degrees Celsius. In the defrosting mode, when it is detected that the outdoor unit coil temperature Ti>8 degrees Celsius, it is then determined whether the duration of the state of the outdoor unit coil temperature Ti>8 reaches the second preset time. The second preset time can be any value in the range of 30-60 seconds. In a preferred embodiment of the present invention, the second preset time is 40 seconds, then, when the state of the outdoor unit coil temperature Ti>8 continues for more than 40 seconds, it is determined that the defrosting has been completed, and at this time, the defrosting is selected to exit . When the outdoor unit coil temperature Ti is not greater than 8, or the outdoor unit coil temperature Ti is greater than 8 but the duration does not exceed 40 seconds, it is judged that the defrosting has not been completed, and the defrosting mode is continued at this time.
需要说明的是,在上述实施例中,尽管退出除霜的条件为室外机盘管温度大于8摄氏度且持续40秒,本领域技术人员还可以根据实际应用场景将退出除霜的条件设置为上述范围内的其他阈值,只要能够准确判断退出除霜的时机即可。It should be noted that, in the above embodiment, although the condition for exiting defrosting is that the temperature of the outdoor unit coil is greater than 8 degrees Celsius and lasts for 40 seconds, those skilled in the art can also set the condition for exiting defrosting to the above according to the actual application scenario. Other thresholds within the range can be used as long as the timing of exiting defrost can be accurately determined.
如上所述,在除霜模式下,通过将检测到的室外机盘管温度与第三设定阈值进行比较,来判断是否退出除霜模式。由于室外机盘管在结霜前后的温差比较大,因此,依据室外机盘管的温度变化能够更加准确地判断除霜是否完成,从而在保证除霜效果的前提下,尽量缩短除霜时间,减少对空调制热效果的影响。此外,还需要说明的是,上文中的第二预设时间、第三设定阈值均可以根据实际应用场景进行设定,也可以由用户自定义设置。As described above, in the defrost mode, it is determined whether to exit the defrost mode by comparing the detected temperature of the outdoor unit coil with the third set threshold. Since the temperature difference of the outdoor unit coil before and after frosting is relatively large, it can be more accurately judged whether the defrosting is completed according to the temperature change of the outdoor unit coil, so that the defrosting time can be shortened as much as possible on the premise of ensuring the defrosting effect. Reduce the impact on the heating effect of the air conditioner. In addition, it should also be noted that the above-mentioned second preset time and third set threshold can be set according to actual application scenarios, and can also be set by the user.
在一个优选的实施方式中,空调器具有旁通支路,除霜模式是通过导通旁通支路的方式对室外机盘管进行除霜的旁通除霜模式。具体地,参照图3,图3是本发明的一个实施例的空调器的结构示意图。如图3所示,在该实施例中,空调器主要包括室外机1、室内机2、压缩机3、四通阀4、以及节流装置5(本实施例中为电子膨胀阀)以及连通压缩机3和室外机1的旁通支路6,旁通支路6上设置有单向旁通阀,如电磁阀61。如果达到除霜条件,则进入旁通除霜模式。如果达到退出除霜条件,则退出旁通除霜模式。下面在图3的基础上,结合图4对本发明的具体操作步骤进行详细说明。In a preferred embodiment, the air conditioner has a bypass branch, and the defrosting mode is a bypass defrosting mode in which the outdoor unit coil is defrosted by turning on the bypass branch. Specifically, referring to FIG. 3 , FIG. 3 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention. As shown in FIG. 3 , in this embodiment, the air conditioner mainly includes an outdoor unit 1, an
图4示出了本发明的除霜控制方法的一个优选实施方式的具体步骤流程图。如图4所示,在空调器制热运行的状态下,每隔15秒检测室外机盘管温度Ti,并计算室外机盘管温度的衰减值ΔT=Ti-Ti+1,30秒内得到两个衰减值ΔT1、ΔT2之后,计算其差值N=ΔT1-ΔT2。Fig. 4 shows a flow chart of specific steps of a preferred embodiment of the defrosting control method of the present invention. As shown in Figure 4, when the air conditioner is in heating operation, the outdoor unit coil temperature T i is detected every 15 seconds, and the attenuation value of the outdoor unit coil temperature ΔT=T i -T i+1 , 30 After two attenuation values ΔT 1 and ΔT 2 are obtained within seconds, the difference N=ΔT 1 −ΔT 2 is calculated.
获取室外机出风口的相对湿度HR,并判断HR是否大于70%。在HR大于70%的情形下,判断N是否满足条件:N>1摄氏度。如果满足条件,则进入旁通除霜;如果不满足条件,则不进入除霜模式。在HR不大于70%的情形下,判断N是否满足条件:N>2摄氏度。如果满足条件,则进入旁通除霜;如果不满足条件,则不进入除霜模式。Obtain the relative humidity HR of the air outlet of the outdoor unit, and determine whether the HR is greater than 70%. In the case that HR is greater than 70%, it is judged whether N satisfies the condition: N>1 degree Celsius. If the conditions are met, the bypass defrost will be entered; if the conditions are not met, the defrost mode will not be entered. In the case that HR is not greater than 70%, it is judged whether N satisfies the condition: N>2 degrees Celsius. If the conditions are met, the bypass defrost will be entered; if the conditions are not met, the defrost mode will not be entered.
具体而言,当N满足进入除霜的条件时,空调器发送打开控制指令到电磁阀61,电磁阀61打开,压缩机3排出的高温高压冷媒气体一部分经四通阀4进入室内机2继续制热,另一部分经旁通支路6直接进入室外机1。高温高压的冷媒气体可在较短的时间提高室外机1的机体温度,使结霜融化。这样一来,在旁通除霜过程中,压缩机3不停机,四通阀4也不换向,空调器不间断地进行制热,可极大地保证空调器的制热效果,使得室内温度波动较小。当N不满足条件时,则不进入除霜模式,直至N满足条件后再进入除霜模式。Specifically, when N satisfies the conditions for entering defrosting, the air conditioner sends an opening control command to the
继续参照图4,在除霜过程中,持续检测室外机盘管的温度Ti,并实时判断室外机盘管温度Ti是否大于8摄氏度,如果是并且维持8摄氏度以上达到40秒,则判断除霜完成,可以选择退出除霜。如果否,则持续进行除霜。退出除霜时,空调器发送关闭控制指令到电磁阀61,电磁阀61关闭,压缩机3排出的高温高压冷媒气体全部经四通阀4进入室内机2制热。Continue to refer to FIG. 4 , during the defrosting process, the temperature Ti of the outdoor unit coil is continuously detected , and it is judged in real time whether the temperature Ti of the outdoor unit coil is greater than 8 degrees Celsius. When defrosting is completed, you can choose to exit defrosting. If not, continue defrosting. When the defrosting is exited, the air conditioner sends a closing control command to the
需要说明的是,为了缩短除霜时间,提升除霜效率,在进行旁路除霜时,可以将室外风机关闭,使高温高压的冷媒气体的热量大部分用于化霜。在退出除霜操作时,再将室外风机打开。It should be noted that, in order to shorten the defrosting time and improve the defrosting efficiency, during the bypass defrosting, the outdoor fan can be turned off, so that most of the heat of the high temperature and high pressure refrigerant gas is used for defrosting. When exiting the defrost operation, turn the outdoor fan on again.
上述实施例虽然是以旁通除霜为例进行说明的,但本发明的除霜控制方法并不限于具体的除霜方式,本领域技术人员可以根据空调器的具体结构选择合适的除霜方式,如采用逆循环除霜、逆循环与旁通交替除霜相结合等方式。本发明旨在提供一种能够更准确地判断进入和退出除霜时机的方法。Although the above embodiments are described by taking the bypass defrosting as an example, the defrosting control method of the present invention is not limited to a specific defrosting method, and those skilled in the art can select a suitable defrosting method according to the specific structure of the air conditioner , such as the use of reverse cycle defrosting, reverse cycle and bypass alternate defrosting and other methods. The present invention aims to provide a method capable of more accurately judging the timing of entering and exiting defrosting.
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。So far, the technical solutions of the present invention have been described with reference to the preferred embodiments shown in the accompanying drawings, however, those skilled in the art can easily understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.
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