TWI720913B - Refrigeration system with abnormal state determination function and abnormal state determination method for the same - Google Patents

Abstract

A refrigeration system with abnormal state determination function includes an ammeter connected to a compressor, an evaporator connected to an EEV (electronic expansion valve) and the compressor, and a controller. The controller continuously records a plurality of current values of the compressor or a plurality of temperature differences of the evaporator according to a time series. The controller determines whether the compressor or the EEV is abnormal according to a population mean and a sampling mean obtained by the plurality of current values or the plurality of temperature differences. The present disclosure further includes an abnormal state determination method for the refrigeration system.

Description

Refrigeration system with device abnormal state judgment function and its device abnormal State judgment method

The present invention relates to a refrigeration system with a device abnormal state judgment function and a device abnormal state judgment method, in particular to a refrigeration system with a device abnormal state judgment function that predicts abnormal operation diagnosis to ensure that the equipment does not malfunction due to long-term abnormal operation and Method for judging the abnormal state of the device.

Common compressors and expansion valves often cause abnormal operation of compressors and expansion valves due to improper machine selection, too small load, poor control program, or improper set control values, which also result in unstable temperature control and high energy consumption in the environment. . For example, it may cause excessive or insufficient defrosting, or the compressor and expansion valve may malfunction due to long-term abnormal operation, and the temperature control of the overall system may be unstable and high energy consumption.

For this reason, how to design a refrigeration system with a device abnormal state judgment function and a device abnormal state judgment method, especially to solve the aforementioned technical problems in the prior art, is an important subject studied by the inventor of the present invention.

One purpose of the present invention is to provide a refrigeration system with a device abnormal state judgment function, which can solve the problem of compressor and expansion valve failures caused by long-term abnormal operation in the prior art, and achieve the purpose of stable temperature control and low energy consumption of the overall system .

In order to achieve the foregoing objective, the refrigeration system with the function of judging the abnormal state of the device proposed in the present invention includes: a compressor, an ammeter, a condenser, an expansion valve, an evaporator, a first thermometer, a second thermometer, and a controller. The ammeter measures the current value of the compressor. The condenser is connected to the compressor. The expansion valve is connected to the condenser. The evaporator is connected to the expansion valve and the compressor. The first thermometer measures the first temperature of the air outlet of the evaporator. The second thermometer measures the second temperature of the refrigerant outlet of the expansion valve. The controller is connected to the compressor, ammeter, first thermometer, second thermometer, and expansion valve. The controller continuously records N current values, N first temperatures, and N second temperatures according to a time sequence, and obtains N number N temperature difference between one temperature and N second temperature. Among them, the controller performs normal operating state calculations on N current values or N temperature differences to obtain normal operating parameters. The controller samples the current values of M pens or the temperature difference of M pens and performs transient operation state calculations to obtain transient operation parameters. Among them, the controller determines whether the compressor or the expansion valve is abnormal based on the normal operating parameters and the transient operating parameters. When the controller determines that an abnormality occurs, the controller counts the number of abnormalities, and then the controller determines that when the number of abnormalities is greater than a preset value, the controller confirms that the compressor or the expansion valve is in an abnormal operating state.

Furthermore, the controller performs an operating state deviation calculation on N current values or N temperature differences to obtain operating state deviation parameters. The controller judges when the transient operating parameters are large When the normal operating parameters and the sum of the operating state deviation parameters are differentiated, the controller determines that the compressor or the expansion valve is abnormal.

Furthermore, the controller samples N current values or N temperature differences to take out M current values or M temperature differences, and performs transient operation state calculations on M current values or M temperature differences to obtain temporary State operating parameters. The controller performs the operation state deviation calculation on the normal operation parameters, and obtains the operation state deviation parameters.

Furthermore, when the controller determines that the quotient of the number of abnormalities divided by the M value is greater than the preset value, the controller confirms that the compressor or the expansion valve is in an abnormal operation state.

Another object of the present invention is to provide a method for judging the abnormal state of the refrigeration system, which can solve the problem of the compressor and the expansion valve of the prior art caused by long-term abnormal operation, and achieve the purpose of stable temperature control and low energy consumption of the overall system .

In order to achieve the aforementioned another object, the present invention proposes a method for judging an abnormal state of a refrigeration system. The refrigeration system includes a compressor, an expansion valve, an evaporator, and a controller. The judgment method includes: measuring the current of the compressor Measure the first temperature of the air outlet of the evaporator; measure the second temperature of the refrigerant outlet of the expansion valve; and the controller continuously records N current values, N first temperatures, and N second temperatures according to a time sequence, And obtain the N temperature difference between N first temperatures and N second temperatures. Among them, the controller performs normal operating state calculations on N current values or N temperature differences to obtain normal operating parameters; the controller samples M current values or M temperature differences and performs transient operating state calculations to obtain transients Operating parameters. Among them, the controller judges whether the compressor or expansion valve is abnormal according to the normal operating parameters and the transient operating parameters; when the controller determines that an abnormality occurs When the time, the controller counts the number of abnormalities, and then the controller determines that when the number of abnormalities is greater than the preset value, the controller confirms that the compressor or the expansion valve is in an abnormal operating state.

Further, the method for judging the abnormal state of the device of the refrigeration system further includes: the controller performs an operating state deviation calculation on N current values or N temperature differences to obtain operating state deviation parameters; when the controller determines that the transient operating parameters are greater than When the normal operating parameters and the differential sum of the operating conditions deviate from the parameters, the controller determines that the compressor or the expansion valve is abnormal.

Furthermore, the method for judging the abnormal state of the device of the refrigeration system further includes: the controller samples N current values or N temperature differences, among which M current values or M temperature differences, and compares M current values or M temperature differences. The temperature difference of M pen performs transient operation state calculation to obtain transient operation parameters; the controller performs operation state deviation calculation on normal operation parameters to obtain operation state deviation parameters.

Furthermore, the method for judging the abnormal state of the device of the refrigeration system further includes: when the quotient of the number of abnormalities determined by the controller divided by the value of M is greater than a preset value, the controller confirms that the compressor or the expansion valve is in an abnormal operating state.

When using the refrigeration system with the device abnormal state judgment function of the present invention, the controller continuously records N current values, N first temperatures, and N second temperatures according to a time sequence, and obtains N first temperatures And the N temperature difference between N second temperatures. The controller can perform normal operating state calculations on N current values or N temperature differences to obtain normal operating parameters. The controller can sample M current values or M temperature differences and perform transient operation state calculations to obtain transient operation parameters. When the controller determines that an abnormality occurs according to the normal operating parameters and the transient operating parameters, the controller counts the number of abnormalities, and then determines whether the number of abnormalities is greater than a preset value to confirm the compressor or the expansion valve Whether it is in abnormal operation state. Compared with the traditional method, due to the lack of monitoring methods for the compressor and expansion valve, often the compressor or expansion valve has been in abnormal operation for a long time but cannot be known. Not only is the temperature control of the overall system unstable and high during the abnormal operation period. Energy consumption may eventually cause irreversible mechanical failure or even damage to the entire system.

For this reason, the refrigeration system with the function of judging the abnormal state of the device and the method for judging the abnormal state of the device of the present invention can solve the problem that the compressor and expansion valve of the prior art malfunction due to long-term abnormal operation, and achieve the temperature control of the overall system The purpose of stability and low energy consumption.

In order to further understand the technology, means and effects of the present invention to achieve the intended purpose, please refer to the following detailed description of the present invention and the accompanying drawings. I believe that the features and characteristics of the present invention will provide an in-depth and specific understanding. However, the accompanying drawings are only provided for reference and illustration, and are not used to limit the present invention.

10, 11: Compressor

20: Condenser

30: Expansion valve

40: evaporator

50: Defroster

51: heating tube

60: Fan

70: Controller

T10: The first thermometer

T20: Second thermometer

I10, I11: Ammeter

S1~S8: steps

Fig. 1 is a system schematic diagram of an embodiment of a refrigeration system with a device abnormal state judgment function of the present invention; Fig. 2 is a schematic diagram of the architecture of this embodiment of a refrigeration system with a device abnormal state judgment function of the present invention; A system schematic diagram of another embodiment of a refrigeration system with a device abnormal state judgment function; and FIGS. 4 and 5 are schematic diagrams of a device abnormal state judgment method of the refrigeration system of the present invention.

The following is a specific embodiment to illustrate the implementation of the present invention. Those familiar with this technology can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied by other different specific examples, and various details in the specification of the present invention can also be modified and changed based on different viewpoints and applications without departing from the spirit of the present invention.

It should be noted that the structure, ratio, size, number of components, etc. shown in the drawings in this specification are only used to match the content disclosed in the specification for the understanding and reading of those familiar with this technology, and are not intended to limit the scope of the present invention. The limited conditions of implementation do not have any technical significance. Any structural modification, proportional relationship change, or size adjustment should fall within the scope of the present invention without affecting the effects that can be produced and the goals that can be achieved by the present invention. The technical content disclosed by the invention can be covered.

The technical content and detailed description of the present invention are described below in conjunction with the drawings.

Please refer to Figure 1 and Figure 2. 1 is a system schematic diagram of an embodiment of a refrigeration system with a device abnormal state judgment function according to the present invention. Fig. 2 is a schematic structural diagram of the embodiment of the refrigeration system with the function of judging the abnormal state of the device according to the present invention.

In an embodiment of the present invention, the refrigeration system with the function of judging the abnormal state of the device includes: a compressor 10, a condenser 20, an expansion valve 30, an evaporator 40, a defrosting device 50, a first thermometer T10, and a second Thermometer T20, ammeter I10, fan 60, and controller 70. Among them, the current meter I10 measures the current value I1 of the compressor 10 (not shown in the figure). The condenser 20 is connected to the compressor 10. The expansion valve 30 is connected to the condenser 20. The evaporator 40 is connected to the expansion valve 30 and the compressor 10. The first thermometer T10 measures the first temperature T1 of the air outlet of the evaporator 40 (not shown in the figure). The second thermometer T20 measures the second temperature T2 of the refrigerant outlet of the expansion valve 30 (not shown in the figure). The fan 60 is arranged at the air inlet of the evaporator 40 to transmit air to the evaporator 40. The controller 70 is connected to the compressor 10, the current meter I10, the first thermometer T10, the second thermometer T20, the expansion valve 30, and the defrosting device 50. The controller 70 continuously records N (where N>1) current values I1, N first temperatures T1, and N second temperatures T2 according to a time sequence, and obtains N first temperatures T1 and N second temperatures The N temperature difference between T2 X _i = T 2- T 1, and it can be judged whether the evaporator 40 needs to be defrosted. When the controller 70 determines that the evaporator 40 needs to be defrosted, the controller 70 activates the defrosting device 50 so that the defrosting device 50 defrosts the evaporator 40 through the heating pipe 51, and the controller 70 closes the expansion valve 30 and closes The compressor 10 restricts the flow of refrigerant from the condenser 20 into the evaporator 40 to avoid affecting the defrosting efficiency and reducing unnecessary power consumption. During the defrosting of the evaporator 40, the controller 70 continuously records the ambient temperature. When the controller 70 determines that the ambient temperature is greater than or equal to the threshold value (not shown in the figure), the controller 70 turns off the defrosting device 50 and starts it The expansion valve 30 and the activation of the compressor 10 allow the refrigerant to flow from the condenser 20 into the evaporator 40 again.

。控制器70對N筆電流值I1或N筆溫度差進行抽樣取出其中M筆(其中，M>1)電流值X _i 或M筆溫度差X _i ，並對M筆電流值X _i 或M筆溫度差X _i 進行暫態運轉狀態運算，獲得暫態運轉參數

。控制器70對常態運轉參數B進行運轉狀態乖離運算，獲得運轉狀態乖離參數

。當控制器70 判斷暫態運轉參數D大於常態運轉參數B以及運轉狀態乖離參數A微分之和值時，即當控制器70判斷D>B+dA時，控制器70判斷壓縮機10或膨脹閥30發生異常。當D>B+dA時，電流值I1作為X _i ，則可判斷可能是壓縮機10發生異常。當D>B+dA時，溫度差T2-T1作為X _i ，則可判斷可能是膨脹閥30發生異常。 Furthermore, the controller 70 performs normal operating state calculations on N current values I1= X _i or N temperature differences X _{i to obtain normal operating parameters}

. The controller 70 samples N current values I1 or N temperature differences, among which M (where M>1) current values X _i or M temperature differences X _{i are taken out} , and M current values X _i or M temperature differences The temperature difference X _i performs transient operation state calculations to obtain transient operation parameters

. The controller 70 performs the operation state deviation calculation on the normal operation parameter B to obtain the operation state deviation parameter

. When the controller 70 determines that the transient operating parameter D is greater than the normal operating parameter B and the differential sum of the operating state deviation parameter A , that is, when the controller 70 determines that D > B + dA , the controller 70 determines that the compressor 10 or the expansion valve 30 An exception occurred. When D is dA, the current value> B + I1 as X _i, the compressor 10 may be judged abnormal. When D > B + dA , and the temperature difference T 2- T 1 is taken as X _i , it can be judged that the expansion valve 30 may be abnormal.

>f時，控制器70確認壓縮機10或膨脹閥30處於異常運轉狀態。 Further, when the controller 70 determines that the abnormality occurs, the controller 70 counts the number of abnormalities C, and then the controller 70 determines that when the number of abnormalities C is greater than the preset value f, the controller 70 confirms that the The engine 10 or the expansion valve 30 is in an abnormal operation state. In the embodiment of the present invention, when the controller 70 determines that the quotient of the counted number of abnormalities C divided by the value M is greater than the preset value f, that is

> f , the controller 70 confirms that the compressor 10 or the expansion valve 30 is in an abnormal operation state.

Please refer to FIG. 3, which is a system schematic diagram of another embodiment of a refrigeration system with a device abnormal state judgment function according to the present invention. This embodiment is substantially the same as the previous embodiment, except that it further includes a compressor 11 and an ammeter I11. The compressor 11 is arranged in parallel beside the compressor 10 to further increase the heat exchange efficiency of the refrigeration system or change the overall entropy of the system. The ammeter I11 measures the current value I2 (not shown in the figure) of the compressor 11 to allow the controller 70 to distinguish the operating states of the two compressors 10 and 11. At this time, the controller 70 can determine whether the compressor 10 or the compressor 11 is abnormal according to the ammeter I10 or the ammeter I11.

Please refer to Figures 4 and 5, which are schematic diagrams of the method for judging the abnormal state of the refrigeration system of the present invention. Please refer to Figure 1 to Figure 3 for the following component numbers. First, the controller 70 measures the current values I1 and I2 of the compressors 10 and 11 through the ammeters I10 and I11 (step S1). The controller 70 measures the first temperature T1 of the air outlet of the evaporator 40 through the first thermometer T10 (step S2). The controller 70 measures the second temperature T2 of the refrigerant outlet of the expansion valve 30 with the second thermometer T20 (step S3). The controller 70 continuously records N current values I1, I2, N first temperatures T1, and N second temperatures T2 according to a time sequence, and obtains N values between N first temperatures and N second temperatures. Pen temperature difference X _i (step S4). Among them, the controller 70 performs normal operating state calculations on N current values I1, I2, or N temperature differences to obtain normal operating parameters B; the controller performs M current values I1= X _i or I2= X _i or M pens the temperature difference between the X _i and the sampling for computing the transient operation state, the transient operating parameters to obtain D (step S5). Next, the controller 70 determines whether the compressor 10, 11 or the expansion valve 30 is abnormal based on the normal operating parameter B and the transient operating parameter D (step S6). When the controller 70 determines that an abnormality has occurred, the controller 70 counts the number of abnormalities, and then the controller 70 determines whether the number of abnormalities is greater than a preset value (step S7). When the controller 70 determines that the number of abnormalities is greater than the preset value, the controller 70 confirms that the compressors 10, 11 or the expansion valve 30 are in an abnormal operation state (step S8).

。所述控制器70可對M筆電流值I1、I2或M筆溫度差進行抽樣且進行暫態運轉狀態運算，獲得暫態運轉參數

。當所述控制器70依據常態運轉參數B以及暫態運轉參數D判斷發生異常時，控制器70統計異常的次數C，繼而判斷當異常的次數C是否大於預設值f，以確認壓縮機10或膨脹閥30是否處於異常運轉狀態。相較於傳統方式來說，由於缺乏對於壓縮機10以及膨脹閥30的監測方式，往往壓縮機10或膨脹閥30已經長期處於異常運轉卻無法得知，不僅異常運轉的期間整體系統之溫 度控制不穩定及高耗能，最終還可能造成整個系統不可逆的機械故障甚至毀損。 When using the refrigeration system with the device abnormal state judgment function of the present invention, the controller 70 continuously records N current values I1, I2, N first temperatures T1, and N second temperatures T2 according to a time sequence, and obtain N T X _i the temperature difference between the first temperature T1 and N T N T a second temperature T2. The controller 70 can perform normal operating state calculations on N current values I1= X _i or N temperature differences X _{i to obtain normal operating parameters}

. The controller 70 can sample M current values I1, I2 or M temperature differences and perform transient operation state calculations to obtain transient operation parameters

. When the controller 70 determines that an abnormality occurs according to the normal operating parameter B and the transient operating parameter D , the controller 70 counts the number of abnormalities C, and then determines whether the number of abnormalities C is greater than the preset value f to confirm the compressor 10 Or whether the expansion valve 30 is in an abnormal operation state. Compared with the traditional method, due to the lack of monitoring methods for the compressor 10 and the expansion valve 30, the compressor 10 or the expansion valve 30 has been in abnormal operation for a long time but cannot be known, not only the temperature control of the overall system during the abnormal operation period. Instability and high energy consumption may eventually cause irreversible mechanical failure or even damage to the entire system.

For this reason, the refrigeration system with the device abnormal state judgment function and the device abnormal state judgment method of the present invention can solve the problem that the compressor 10 and the expansion valve 30 of the prior art malfunction due to long-term abnormal operation, and achieve the overall system The purpose of stable temperature control and low energy consumption.

The above are only detailed descriptions and drawings of the preferred embodiments of the present invention. However, the features of the present invention are not limited to these and are not intended to limit the present invention. All the scope of the present invention should be covered by the following patent application scope As the standard, all embodiments that conform to the spirit of the patent application of the present invention and similar variations should be included in the scope of the present invention. Anyone familiar with the art in the field of the present invention can easily think of changes. Or modification can be covered in the following patent scope of this case.

10: Compressor

20: Condenser

30: Expansion valve

40: evaporator

50: Defroster

51: heating tube

60: Fan

T10: The first thermometer

T20: Second thermometer

I10: Ammeter

Claims (8)

A refrigeration system with a device abnormal state judgment function, comprising: at least one compressor; at least one ammeter for measuring at least one current value of the at least one compressor; a condenser connected to the at least one compressor; an expansion valve, Connected to the condenser; an evaporator connected to the expansion valve and the at least one compressor; a first thermometer to measure at least a first temperature of an air outlet of the evaporator; a second thermometer to measure the expansion valve At least one second temperature of a refrigerant outlet; and a controller connected to the at least one compressor, the at least one ammeter, the first thermometer, the second thermometer, and the expansion valve, the controller continuously according to a time sequence Groundly record N number of the current value, N number of the first temperature and N number of the second temperature, and obtain N number of temperature differences between N number of the first temperature and N number of the second temperature; wherein, the controller Perform normal operating state calculations on N current values or N temperature differences to obtain a normal operating parameter; the controller samples M current values or M temperature differences and performs transient operating state calculations to obtain A transient operating parameter; wherein the controller determines whether an abnormality occurs in the at least one compressor or the expansion valve according to the normal operating parameter and the transient operating parameter; when the controller determines that the abnormality occurs, the control The controller counts the number of exceptions, and then the controller determines when the number of exceptions is large At a preset value, the controller confirms that the at least one compressor or the expansion valve is in an abnormal operating state; wherein, the controller samples N current values and extracts M current values, or the control The device samples N temperature differences and takes out M temperature differences. The refrigeration system with a device abnormal state judgment function according to claim 1, wherein the controller performs an operating state deviation calculation on N current values or N temperature differences to obtain an operating state deviation parameter; the control The controller determines that when the transient operating parameter is greater than the sum of the normal operating parameter and the differential of the operating state deviation parameter, the controller determines that the at least one compressor or the expansion valve has the abnormality. The refrigeration system with a device abnormal state judgment function according to claim 2, wherein the controller performs a transient operation state calculation on the M current values or M temperature differences to obtain the transient operation parameters; the control The device performs the operating state deviation calculation on the normal operating parameter to obtain the operating state deviation parameter. The refrigeration system with a device abnormal state judging function according to claim 3, wherein, when the controller judges that the number of abnormalities divided by the value of M is greater than the preset value, the controller confirms the at least one compression The engine or the expansion valve is in the abnormal operating state. A method for judging an abnormal state of a refrigeration system, the refrigeration system comprising at least one compressor, an expansion valve, an evaporator, and a controller, and the judging method comprises: measuring at least one current value of the at least one compressor; Measuring at least a first temperature of an air outlet of the evaporator; Measuring at least one second temperature of a refrigerant outlet of the expansion valve; and the controller continuously records N of the current value, N of the first temperature, and N of the second temperature according to a time sequence, and obtains N N temperature differences between the first temperature and the N second temperatures; wherein the controller performs normal operating state calculations on the N current values or the N temperature differences to obtain a normal operating parameter; the control The controller samples the current value of M pens or the temperature difference of M pens and performs transient operation state calculation to obtain a transient operation parameter; wherein, the controller judges the at least one according to the normal operation parameter and the transient operation parameter Whether an abnormality occurs in a compressor or the expansion valve; when the controller determines that the abnormality occurs, the controller counts the number of abnormalities, and then the controller determines that when the number of abnormalities is greater than a preset value, the control The controller confirms that the at least one compressor or the expansion valve is in an abnormal operating state; wherein, the controller samples N current values and takes out M current values, or the controller samples N temperature differences Take out the temperature difference between M pens. According to claim 5, the method for judging the abnormal state of the refrigeration system device further includes: the controller performs an operating state deviation calculation on N current values or N temperature differences to obtain an operating state deviation parameter; When the controller determines that the transient operating parameter is greater than the sum of the normal operating parameter and the differential of the operating state deviation parameter, the controller determines that the at least one compressor or the expansion valve has the abnormality. The method for judging the abnormal state of the refrigeration system as described in claim 5 further includes: The controller performs normal operating state calculations on the current value of M pens or the temperature difference of M pens to obtain the transient operating parameters; the controller performs the operating state deviation calculations on the normal operating parameters to obtain the operating state deviation parameters. The method for judging the abnormal state of the refrigeration system according to claim 7, further comprising: when the controller judges that the number of abnormalities divided by the value of M is greater than the preset value, the controller confirms the at least one compression The engine or the expansion valve is in the abnormal operating state.

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