TW202201160A - Refrigeration system with automatic defrosting function and automatic defrosting control method for the same - Google Patents

Abstract

A refrigeration system with automatic defrosting function includes a condenser 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 temperature differences of the evaporator according to a time series to determine whether the evaporator needs to be defrosted. When the controller determines that the evaporator needs to be defrosted, the controller activates a defrost device to defrost the evaporator, and the controller closes the EEV and the compressor. The present disclosure further includes an automatic defrosting control method for the refrigeration system.

Description

Refrigeration system with automatic defrosting function and automatic defrosting control method thereof

The invention relates to a freezing system with automatic defrosting function and an automatic defrosting control method thereof, in particular to a freezing system with automatic defrosting function and an automatic defrosting control method achieved by normal refrigeration state calculation and refrigeration state deviation calculation .

General defrosting devices are mostly timed start or timed stop devices. However, the situation of frosting will vary due to the humidity conditions of the surrounding environment, the frequency of use and the evaporating temperature conditions. Therefore, the defrosting device that starts or stops regularly often causes the problem of excessive defrosting or insufficient defrosting, and also leads to unstable temperature control and high energy consumption of the overall system.

Therefore, how to design a refrigeration system with automatic defrosting function and its automatic defrosting control method, especially how to solve the aforementioned technical problems in the prior art, is an important subject studied by the present inventor.

An object of the present invention is to provide a refrigeration system with an automatic defrosting function, which can solve the problem that the defrosting device in the prior art often causes excessive or insufficient defrosting, and achieve the purpose of stable temperature control and low energy consumption of the overall system .

In order to achieve the aforementioned object, the refrigeration system with automatic defrosting function proposed by the present invention includes: a compressor, a condenser, an electronic expansion valve, an evaporator, a defrosting device, a first thermometer, a second thermometer and a controller. The condenser is connected to the compressor. The electronic expansion valve is connected to the condenser. The evaporator is connected to the electronic expansion valve and the compressor. The defrosting device is arranged adjacent to the evaporator. The first thermometer measures a first temperature of the air outlet of the evaporator. The second thermometer measures the second temperature of the refrigerant outlet of the electronic expansion valve. The controller is connected to the compressor, the first thermometer, the second thermometer, the electronic expansion valve and the defrosting device, and the controller continuously records N first temperature and N second temperature according to the time series, and uses N first temperature and The N temperature difference between the N second temperatures determines whether the evaporator needs to be defrosted. Wherein, when the controller determines that the evaporator needs to be defrosted, the controller activates the defrosting device, so that the defrosting device defrosts the evaporator, and the controller closes the electronic expansion valve and closes the compressor.

Further, the refrigerating system with automatic defrosting function further includes a third thermometer, the third thermometer is connected to the controller, and measures the ambient temperature of the refrigerating system, and the controller continuously records the ambient temperature, when the ambient temperature is greater than or When it is equal to the threshold value, the controller turns off the defrost device, activates the electronic expansion valve and starts the compressor.

Further, the controller performs a normal cooling state operation on the N temperature differences to obtain a normal cooling state parameter. The controller samples the N temperature differences to take out M temperature differences, and performs a transient cooling state operation on the M temperature differences to obtain transient cooling state parameters. The controller performs the cooling state deviation parameter operation on the normal cooling state parameters to obtain the cooling state deviation parameter. The controller judges whether the evaporator needs to be defrosted according to the cooling state deviation parameter, the normal cooling state parameter and the transient cooling state parameter.

Further, when the transient cooling state parameter is greater than the sum of the normal cooling state parameter and the differential of the cooling state deviation parameter, the controller determines that the evaporator needs to be defrosted.

Another object of the present invention is to provide an automatic defrosting control method for a refrigeration system, which can solve the problem that the defrosting device in the prior art often causes excessive defrosting or insufficient defrosting, and achieve stable temperature control and low energy consumption of the overall system. Purpose.

In order to achieve the above-mentioned other object, the refrigeration system proposed by the present invention includes a compressor, a condenser, an electronic expansion valve, an evaporator, a defrosting device and a controller, and the control method includes: measuring the first degree of the air outlet of the evaporator. a temperature; measure the second temperature of the refrigerant outlet of the electronic expansion valve; and the controller continuously records N first temperatures and N second temperatures according to time series, and uses the difference between N first temperatures and N second temperatures The N temperature difference between the two can be used to judge whether the evaporator needs to be defrosted. Wherein, when the controller determines that the evaporator needs to be defrosted, the controller activates the defrosting device, so that the defrosting device defrosts the evaporator, and the controller closes the electronic expansion valve and closes the compressor.

Further, the automatic defrosting control method of the refrigerating system further comprises: measuring the ambient temperature of the refrigerating system, the controller continuously records the ambient temperature, and when the ambient temperature is greater than or equal to a threshold value, the controller turns off the defrosting device , and start the electronic expansion valve and start the compressor.

Further, the automatic defrosting control method of the refrigeration system further includes: the controller performs a normal refrigeration state calculation on N temperature differences, and obtains a normal refrigeration state parameter. The controller samples the N temperature differences to take out M temperature differences, and performs a transient cooling state operation on the M temperature differences to obtain transient cooling state parameters. The controller performs the cooling state deviation parameter operation on the normal cooling state parameters to obtain the cooling state deviation parameter. The controller judges whether the evaporator needs to be defrosted according to the cooling state deviation parameter, the normal cooling state parameter and the transient cooling state parameter.

Further, the automatic defrosting control method of the refrigeration system further includes: when the transient refrigeration state parameter is greater than the sum of the normal refrigeration state parameter and the differential of the refrigeration state deviation parameter, the controller determines that the evaporator needs to be defrosted.

When using the refrigerating system with automatic defrosting function according to the present invention, the controller continuously records N first temperatures and N second temperatures according to the time series, and judges whether the evaporator needs the evaporator according to the N temperature differences. Defrost. Compared with the traditional method, since the traditional method is controlled according to the timed start or timed stop, the problem of excessive defrosting or insufficient defrosting is often caused. The controller of the present invention can perform a normal cooling state operation on N temperature differences to obtain a normal cooling state parameter. The controller can sample the N temperature differences to take out M temperature differences, and perform a transient cooling state operation on the M temperature differences to obtain transient cooling state parameters. The controller may perform a cooling state deviation parameter operation on the normal cooling state parameter to obtain the cooling state deviation parameter. Finally, the controller judges whether the evaporator needs to be defrosted according to the aforementioned cooling state deviation parameter, the normal cooling state parameter and the transient cooling state parameter. And the present invention can further judge whether the ambient temperature is greater than or equal to the threshold value, so that the controller can turn off the defrosting device. The present invention automatically performs or stops defrosting according to actual environmental conditions.

Therefore, the refrigerating system with automatic defrosting function and the automatic defrosting control method of the present invention can solve the problem that the defrosting device in the prior art often causes excessive defrosting or insufficient defrosting, and achieve the temperature control of the whole system. The purpose of stability and low energy consumption.

In order to further understand the technology, means and effect of the present invention to achieve the predetermined purpose, please refer to the following detailed description of the present invention and the accompanying drawings. It is believed that the features and characteristics of the present invention can be used to gain a deep and specific understanding. However, the accompanying drawings are only provided for reference and description, and are not intended to limit the present invention.

The following describes the implementation of the present invention through specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied by other different specific examples, and various modifications and changes can be made to the details in the description of the present invention based on different viewpoints and applications without departing from the spirit of the present invention.

It should be noted that the structure, proportion, size, number of components, etc. shown in the drawings in this specification are only used to cooperate with the content disclosed in the specification for the understanding and reading of those skilled in the art, and are not intended to limit the scope of the present invention. The limitations of the implementation, so it has no technical significance, any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, shall fall within the scope of this The technical content disclosed by the invention can be covered within the scope.

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

Please refer to Figure 1 and Figure 2. Among them, FIG. 1 is a system schematic diagram of an embodiment of a refrigeration system with an automatic defrosting function of the present invention. FIG. 2 is a schematic structural diagram of the embodiment of the refrigeration system with automatic defrosting function of the present invention.

，判斷蒸發器40是否需要進行除霜。In an embodiment of the present invention, the refrigeration system with automatic defrosting function includes: a compressor 10, a condenser 20, an electronic expansion valve 30, an evaporator 40, a defrosting device 50, a first thermometer T10, a second Thermometer T20 , third thermometer T30 , fan 60 and controller 70 . The condenser 20 is connected to the compressor 10 . The electronic expansion valve 30 is connected to the condenser 20 . The evaporator 40 is connected to the electronic expansion valve 30 and the compressor 10 . The defrosting device 50 is disposed adjacent to the evaporator 40. In the embodiment of the present invention, the defrosting device 50 is connected to the heating pipe 51 to heat the evaporator 40 and achieve the purpose of defrosting. The first thermometer T10 measures the first temperature T1 (not shown) of the air outlet of the evaporator 40 . The second thermometer T20 measures the second temperature T2 (not shown) of the refrigerant outlet of the electronic expansion valve 30 . The third thermometer T30 measures the ambient temperature T3 of the refrigeration system (not shown in the figure). The fan 60 is disposed at the air inlet of the evaporator 40 to transmit air into the evaporator 40 . The controller 70 is connected to the compressor 10 , the first thermometer T10 , the second thermometer T20 , the third thermometer T30 , the electronic expansion valve 30 and the defrosting device 50 . The controller 70 continuously records N (where N>1) first temperature T1 and N second temperature T2 according to the time series, and uses N between N first temperature T1 and N second temperature T2. Temperature difference

, to determine whether the evaporator 40 needs to be defrosted.

Wherein, 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 electronic expansion valve 30 and turn off the compressor 10, that is, restrict the refrigerant flowing from the condenser 20 into the evaporator 40, so as to avoid affecting the defrosting efficiency and reducing unnecessary power consumption. During the defrosting period of the evaporator 40, the controller 70 continuously records the ambient temperature T3. When the controller 70 determines that the ambient temperature T3 is greater than or equal to a threshold value (not shown in the figure), the controller 70 closes the defrosting device 50, And start the electronic expansion valve 30 and start the compressor 10 , so that the refrigerant flows from the condenser 20 into the evaporator 40 again.

進行常態製冷狀態運算，獲得常態製冷狀態參數

。控制器70對N筆溫度差

進行抽樣取出其中M筆(其中，M＞1)溫度差

，並對M筆溫度差

進行暫態製冷狀態運算，獲得暫態製冷狀態參數

。控制器70對常態製冷狀態參數

進行製冷狀態乖離參數運算，獲得製冷狀態乖離參數

。控制器70依據製冷狀態乖離參數

、常態製冷狀態參數

以及暫態製冷狀態參數

判斷蒸發器40是否需要進行除霜。具體地，當控制器70判斷暫態製冷狀態參數

大於常態製冷狀態參數

以及製冷狀態乖離參數

微分之和值時，即當控制器70判斷

時，控制器70判斷蒸發器40需要進行除霜。Further, during the period when the controller 70 determines whether the evaporator 40 needs to be defrosted, the controller 70 measures the temperature difference of N

Perform the normal cooling state operation to obtain the normal cooling state parameters

. The temperature difference between the controller 70 and N pens

Carry out sampling and take out the temperature difference of M pens (where M>1)

, and the temperature difference of the M pen

Perform transient cooling state operation to obtain transient cooling state parameters

. The controller 70 compares the parameters of the normal cooling state

Perform the cooling state deviation parameter calculation to obtain the cooling state deviation parameter

. The controller 70 deviates the parameter according to the cooling state

, Normal cooling state parameters

and transient cooling state parameters

It is judged whether defrosting of the evaporator 40 is necessary. Specifically, when the controller 70 determines the transient cooling state parameter

Greater than the normal cooling state parameter

and the cooling state deviation parameter

When the sum of derivatives is the value, that is, when the controller 70 judges

, the controller 70 determines that the evaporator 40 needs to be defrosted.

Please refer to FIG. 3 , which is a system schematic diagram of another embodiment of a refrigeration system with an automatic defrosting function of the present invention. This embodiment is substantially the same as the previous embodiment, except that one more compressor 10 is arranged in parallel to further increase the heat exchange efficiency of the refrigeration system or change the entropy of the entire system.

，判斷蒸發器40是否需要進行除霜(步驟S3)。其中，當控制器70判斷蒸發器40需要進行除霜時，控制器70啟動除霜裝置50，使除霜裝置50對蒸發器40進行除霜，且控制器70關閉電子膨脹閥30以及關閉壓縮機10(步驟S4)。繼而，控制器70通過第三溫度計T30連續地記錄環境溫度，且判斷環境溫度是否大於或等於閥值(步驟S5)。當環境溫度大於或等於閥值時，控制器70關閉除霜裝置50，並啟動電子膨脹閥30以及啟動壓縮機10(步驟S6)。Please refer to FIG. 4 and FIG. 5 , which are schematic diagrams of the automatic defrosting control method 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 first temperature T1 of the air outlet of the evaporator 40 through the first thermometer T10 (step S1 ). The controller 70 measures the second temperature T2 of the refrigerant outlet of the electronic expansion valve 30 through the second thermometer T20 (step S2). The controller 70 continuously records N first temperature T1 and N second temperature T2 according to the time series, and uses N temperature difference between N first temperature T1 and N second temperature T2

, it is judged whether the evaporator 40 needs to be defrosted (step S3 ). Wherein, 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, and the controller 70 closes the electronic expansion valve 30 and closes the compression machine 10 (step S4). Then, the controller 70 continuously records the ambient temperature through the third thermometer T30, and determines whether the ambient temperature is greater than or equal to the threshold (step S5). When the ambient temperature is greater than or equal to the threshold value, the controller 70 turns off the defrosting device 50, activates the electronic expansion valve 30 and activates the compressor 10 (step S6).

判斷蒸發器40是否需要進行除霜。相較於傳統方式來說，由於傳統方式是依據定時啟動或定時停止的方式進行控制，常常造成除霜過度或除霜不足之問題。本發明的所述控制器70可對N筆溫度差

進行常態製冷狀態運算以獲得常態製冷狀態參數

。所述控制器70可對N筆溫度差

進行抽樣取出其中M筆溫度差

，並對M筆溫度差

進行暫態製冷狀態運算以獲得暫態製冷狀態參數

。所述控制器70可對常態製冷狀態參數

進行製冷狀態乖離運算，以獲得製冷狀態乖離參數

。最後所述控制器70依據前述製冷狀態乖離參數

、常態製冷狀態參數

以及暫態製冷狀態參數

判斷蒸發器40是否需要進行除霜。且本發明更可進一步地判斷環境溫度T3是否大於或等於閥值，以使控制器70關閉除霜裝置50。本發明是依據實際環境狀態而自動化地進行除霜或停止除霜。When using the freezing system with automatic defrosting function according to the present invention, the controller 70 continuously records N first temperature T1 and N second temperature T2 according to the time series, and passes the N temperature difference

It is judged whether defrosting of the evaporator 40 is necessary. Compared with the traditional method, since the traditional method is controlled according to the timing start or timing stop, the problem of excessive defrosting or insufficient defrosting is often caused. The controller 70 of the present invention can control the temperature difference of N

Perform the normal cooling state operation to obtain the normal cooling state parameters

. The controller 70 can respond to N temperature differences

Carry out sampling and take out the temperature difference of M pens

, and the temperature difference of the M pen

Perform transient cooling state operation to obtain transient cooling state parameters

. The controller 70 can control the normal cooling state parameters

Perform cooling state deviation calculation to obtain cooling state deviation parameters

. Finally, the controller 70 is based on the aforementioned cooling state deviation parameter

, Normal cooling state parameters

and transient cooling state parameters

It is judged whether defrosting of the evaporator 40 is necessary. In addition, the present invention can further determine whether the ambient temperature T3 is greater than or equal to the threshold value, so that the controller 70 closes the defrosting device 50 . The present invention automatically performs or stops defrosting according to actual environmental conditions.

Therefore, the refrigerating system with automatic defrosting function and the automatic defrosting control method of the present invention can solve the problem that the defrosting device in the prior art often causes excessive defrosting or insufficient defrosting, and achieve the temperature control of the whole system. The purpose of stability and low energy consumption.

The above descriptions are only detailed descriptions and drawings of the preferred embodiments of the present invention, but the features of the present invention are not limited thereto, and are not intended to limit the present invention. The entire scope of the present invention should be defined as the following claims All embodiments that conform to the spirit of the scope of the patent application of the present invention and similar variations thereof shall be included in the scope of the present invention. Any person familiar with the art in the field of the present invention can easily think of the variations. Or modifications can be covered by the following patent scope of this case.

10: Compressor

20: Condenser

30: Electronic expansion valve

40: Evaporator

50: Defrost device

51: Heating tube

60: Fan

70: Controller

T10: First Thermometer

T20: Second Thermometer

T30: Third Thermometer

S1~S6: Steps

Fig. 1 is the system schematic diagram of one embodiment of the refrigeration system with automatic defrosting function of the present invention;

2 is a schematic structural diagram of the embodiment of the refrigeration system with automatic defrosting function of the present invention;

3 is a system schematic diagram of another embodiment of a refrigeration system with an automatic defrosting function of the present invention; and

FIG. 4 and FIG. 5 are schematic diagrams of the automatic defrosting control method of the refrigeration system of the present invention.

10: Compressor

20: Condenser

30: Electronic expansion valve

40: Evaporator

50: Defrost device

51: Heating tube

60: Fan

T10: First Thermometer

T20: Second Thermometer

T30: Third Thermometer

Claims (8)

A freezing system with automatic defrosting, comprising: a compressor; a condenser, connected to the compressor; an electronic expansion valve, connected to the condenser; an evaporator, connected to the electronic expansion valve and the compressor; a defrosting device, adjacent to the evaporator; a first thermometer to measure a first temperature of an air outlet of the evaporator; a second thermometer for measuring a second temperature of a refrigerant outlet of the electronic expansion valve; and a controller connected to the compressor, the first thermometer, the second thermometer, the electronic expansion valve and the defrosting device, the controller continuously records N records of the first temperature and N records of the first temperature according to a time series Two temperatures, and use N temperature differences between N the first temperature and N the second temperature to determine whether the evaporator needs to be defrosted; Wherein, when the controller determines that the evaporator needs to be defrosted, the controller activates the defrosting device, so that the defrosting device defrosts the evaporator, and the controller closes the electronic expansion valve and closes the compressor. The refrigerating system with automatic defrosting function as claimed in claim 1, further comprising a third thermometer, the third thermometer is connected to the controller and measures an ambient temperature of the refrigerating system, and the controller continuously records the Ambient temperature, when the ambient temperature is greater than or equal to a threshold, the controller closes the defrosting device, activates the electronic expansion valve and activates the compressor. The refrigerating system with automatic defrosting function as described in claim 1, wherein, The controller performs a normal cooling state operation on the N temperature differences to obtain a normal cooling state parameter; The controller samples the N temperature differences to take out the M temperature differences, and performs a transient cooling state operation on the M temperature differences to obtain a temporary cooling state parameter; The controller performs a standard deviation operation on the normal cooling state parameter to obtain a cooling state deviation parameter; and The controller judges whether the evaporator needs to be defrosted according to the refrigeration state deviation parameter, the normal refrigeration state parameter and the transient refrigeration state parameter. The refrigeration system with automatic defrosting function according to claim 3, wherein, when the transient refrigeration state parameter is greater than the sum of the normal refrigeration state parameter and the derivative of the refrigeration state deviation parameter, the controller determines that the evaporator Defrost is required. An automatic defrosting control method for a refrigeration system, the refrigeration system includes a compressor, a condenser, an electronic expansion valve, an evaporator, a defrosting device and a controller, and the control method includes: measuring a first temperature of an air outlet of the evaporator; measuring a second temperature of a refrigerant outlet of the electronic expansion valve; and The controller continuously records N the first temperature and the N second temperature according to a time series, and uses the N temperature difference between the N first temperature and the N second temperature to determine the evaporation Whether the device needs to be defrosted; Wherein, when the controller determines that the evaporator needs to be defrosted, the controller activates the defrosting device, so that the defrosting device defrosts the evaporator, and the controller closes the electronic expansion valve and closes the compressor. The automatic defrosting control method for a refrigeration system as claimed in claim 5, further comprising: Measuring an ambient temperature of the refrigeration system, the controller continuously records the ambient temperature, when the ambient temperature is greater than or equal to a threshold, the controller closes the defrosting device, activates the electronic expansion valve and activates the compressor. The automatic defrosting control method for a refrigeration system as claimed in claim 5, further comprising: The controller performs a normal cooling state operation on the N temperature differences to obtain a normal cooling state parameter; The controller samples the N temperature differences to take out the M temperature differences, and performs a transient cooling state operation on the M temperature differences to obtain a temporary cooling state parameter; The controller performs a cooling state deviation calculation on the normal cooling state parameter to obtain a cooling state deviation parameter; and The controller judges whether the evaporator needs to be defrosted according to the refrigeration state deviation parameter, the normal refrigeration state parameter and the transient refrigeration state parameter. The automatic defrosting control method for a refrigeration system as claimed in claim 7, further comprising: When the transient refrigeration state parameter is greater than the sum of the normal refrigeration state parameter and the differential of the refrigeration state deviation parameter, the controller determines that the evaporator needs to be defrosted.

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