Refrigerator and detection method of power consumption thereof

Abstract

The present invention discloses a refrigerator and a method for detecting its power consumption, comprising: selecting a low speed and a high speed at a set ambient temperature; the compressor runs at a low speed, and switches to a high speed after a period of maintenance; the steady-state power consumption and defrosting power consumption of the refrigerator are collected, and the daily power consumption at the set ambient temperature is calculated. A set of arithmetic progressions are selected as the speed of the compressor, so that the refrigerator runs in an energy-saving state, and the steady-state power at the corresponding speed and the number of times the refrigeration electric damper is opened / closed in a single startup cycle of the compressor are recorded, and the compressor speed corresponding to the lowest power and the higher number is selected as the low speed; the compressor speed corresponding to the lowest number and the lower power is selected as the high speed. The present invention scientifically selects the operating speed of the compressor to maintain the power consumption within the required limit range.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration, and in particular to a refrigerator and a method for detecting power consumption thereof. Background Art

[0002] The power consumption of refrigerators is an important indicator for users to choose. When the heat load of the refrigerator is small, the compressor generally runs at a low frequency, the cooling capacity is small, the evaporation temperature rises, the condensation temperature decreases, the compressor refrigeration efficiency is improved, and the energy saving effect is obvious. When the heat load of the refrigerator is large, the compressor runs at a higher frequency to increase the cooling capacity of the compressor to meet the needs of high temperature environment or high heat load. At this time, the energy consumption of the refrigerator is relatively high. Therefore, the selection of compressor speed is very important in the refrigerator design stage.

[0003] On the other hand, the comprehensive power consumption of refrigerators is mostly the power detected when the refrigerator enters the energy-saving state. The energy-saving state of the refrigerator means that the refrigerator door has not been opened for a long time, the load inside the refrigerator is low, and the required cooling capacity is small. At this time, the compressor can reduce the speed to maintain the stability of the internal temperature of the refrigerator with the lowest energy consumption.

[0004] During the test, the refrigerator is simulated to be closed for a long time. At this time, the compressor only needs to provide the cooling capacity required to maintain the heat exchange between the refrigerator and the environment, and does not need to maintain high speed operation. In actual testing, the refrigerator is considered to be in energy-saving state if there is no door opening action during the operation of a set period of time. At this time, the power consumption of the refrigerator is tested. In this state, the compressor runs at a lower speed, which is used as the initial speed and maintained. If the compressor does not stop within the specified time, it indicates that the cooling capacity at this speed is insufficient. At this time, the compressor needs to increase the frequency and run at a higher speed. If the initial speed is selected too low, the compressor frequency increase action will cause a sudden increase in power; conversely, if the initial speed is selected too high and the power is high, it may cause the power consumption to fail to meet the required limit (the national standard stipulates that the actual measured power consumption value shall not be higher than 115% of the power consumption declared on the nameplate).

[0005] From the above, we can see that if the low speed is not selected properly, the compressor may not stop for a long time. At this time, the compressor needs to speed up. Although the high speed can make the refrigerator and freezer meet the refrigeration needs as soon as possible, it will also cause the compressor to run at a higher power and the daily power consumption will surge. Therefore, it is necessary to reasonably select the operating speed of the compressor in an energy-saving state. In traditional designs, the low speed of the compressor is often selected based on experience, mainly based on the start-up rate and power consumption test results. This method has a long test cycle and the results may not be consistent with the actual operating conditions.

[0006] Therefore, for refrigerators, how to reasonably set the speed of the variable frequency compressor in the energy-saving state to avoid the compressor not stopping within the specified test time during the power consumption test, or the power consumption of the whole machine exceeding the power consumption limit range is a technical problem that needs to be solved urgently in the industry. Summary of the invention

[0007] The present invention provides a refrigerator and a method for detecting power consumption of the refrigerator to solve the technical problem of difficulty in selecting the rotation speed of a compressor when testing power consumption of a refrigerator in the prior art, so as to ensure that the power consumption of the refrigerator is maintained within a relatively low range when the refrigerator is in an energy-saving state.

[0008] The technical solution adopted by the present invention is to provide a method for detecting power consumption of a refrigerator, comprising:

[0009] Under the set ambient temperature, select a low speed and a high speed;

[0010] The compressor runs at a low speed for a period of time t and then switches to a high speed operation;

[0011] Collect the steady-state power consumption and defrosting power consumption of the refrigerator, and calculate the daily power consumption at the set ambient temperature.

[0012] Furthermore, a set of arithmetic progressions are selected as the speed of the compressor to make the refrigerator operate in an energy-saving state, and the steady-state power at the corresponding speed and the number of times the refrigeration electric damper is opened / the refrigeration electric damper is closed in a single startup cycle of the compressor are recorded. The compressor speed corresponding to the lowest power and the higher number is selected as the low speed; the compressor speed corresponding to the lowest number and the lower power is selected as the high speed.

[0013] Preferably, the number of times the higher refrigeration electric damper is opened / the refrigeration electric damper is closed is three times.

[0014] Preferably, the minimum number of times the refrigeration electric damper is opened / closed is once.

[0015] Preferably, the low speed is 1500r and the high speed is 1800r.

[0016] Furthermore, the maintenance time t of the low-speed operation is determined according to the number of times the refrigeration electric damper is opened / the refrigeration electric damper is closed. When the number of times the refrigeration electric damper is opened / the refrigeration electric damper is closed does not exceed the set number of times, the maintenance time is the sum of a single startup cycle time and the allowable error value.

[0017] Furthermore, when the number of times the refrigeration electric damper is opened / the number of times the refrigeration electric damper is closed exceeds the set number, a group of time durations is selected, and the steady-state power under the corresponding time durations and the number of times the refrigeration electric damper is opened / the number of times the refrigeration electric damper is closed in a single startup cycle of the compressor are recorded, and the time duration corresponding to the lowest power and the lower number of times is selected as the maintenance time of the low-speed operation.

[0018] Preferably, the set number of times is three times.

[0019] As another embodiment, the maintenance time t of the low-speed operation is determined as follows: the compressor runs at a low speed, and when the refrigeration electric damper is closed and the freezer temperature is lower than a set temperature, the compressor speed is increased to a high speed. Alternatively, the compressor runs at a low speed, and when the refrigeration electric damper is actuated a set number of times, the compressor speed is increased to a high speed.

[0020] The present invention also provides a refrigerator, the power consumption of the refrigerator is tested according to the above detection method.

[0021] Compared with the prior art, the present invention scientifically selects the initial operating speed of the compressor during testing, and reasonably and dynamically adjusts the compressor speed, so as to maintain the power consumption within the required limit range, and has obvious energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The invention is described in detail below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 It is a curve diagram of the temperature changes in the refrigerator and freezer compartments when the refrigerator is running;

[0024] Figure 2 This is the trend graph of the steady-state average power consumption of the refrigerator changing with the compressor speed;

[0025] Figure 3 It is the experimental data for selecting low speed and high speed of the compressor.

[0026] Figure 4 is a flow chart of a first embodiment of selecting a compressor speed and a holding time;

[0027] Figure 5 The present invention is a flow chart of another embodiment of selecting the compressor speed and the maintenance time.

[0028] in:

[0029] S1 low speed, S2 high speed;

[0030] tLow speed maintenance time, △t time allowable error value,

[0031] n is the set number of cooling times. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and do not constitute a limitation to the present invention.

[0033] The terms used in this specification are only for describing specific embodiments and are not intended to limit the present invention. Unless otherwise specifically stated, the relative arrangement of the components and steps, numerical expressions and numerical values ​​described in these embodiments do not limit the protection scope of the present invention.

[0034] The techniques, methods and equipment known to ordinary technicians in the relevant fields are not discussed in detail in this specification, but where appropriate, the techniques, methods and equipment should be considered as part of this specification. Any specific values ​​in this specification should be interpreted as being merely exemplary and not limiting the present invention.

[0035] For the convenience of description, the terms describing the position used in the specification, such as "above...", "to the left of...", "in front of...", etc., are only used to describe the spatial position relationship between a certain component and other components of the embodiment shown in the figure. When the position of the component is different, the relative position will change. Therefore, the position relationship of the embodiment of the drawing should not constitute a limitation to the present invention.

[0036] In addition, it should be noted that the terms "first" and "second" used in the specification are only used to distinguish similar components, and there is no order of precedence, so they cannot be understood as limiting the scope of protection of the present invention.

[0037] For traditional refrigerators, the target temperature of the refrigerator compartment is 4°C, and the target temperature of the freezer compartment is -18°C. Assume that the start-up point temperature of the refrigerator compartment is 5°C, the stop point temperature is 3°C, and the start-up point temperature of the freezer compartment is -17°C, and the stop point temperature is -19°C. When the temperature of the refrigerator compartment is higher than 5°C or the temperature of the freezer compartment is higher than -17°C, there is a cooling demand for the compartment, and the compressor needs to be started to cool the compartment.

[0038] Figure 1 It is a curve chart of the temperature changes in the refrigerator and freezer compartments when the refrigerator is running.

[0039] like Figure 1As shown in the figure, during the shutdown phase of the compressor, if it is detected that there is a cooling demand in the refrigerator, the compressor starts, the refrigerator electric damper and the refrigeration fan in the refrigerator are turned on, and the return air from the refrigerator and the freezer are respectively sent to the refrigerator and the freezer through the refrigeration duct, the refrigeration electric damper and the refrigeration duct after the return air from the refrigerator and the freezer is merged in the main pipe and flows through the evaporator for cooling. When the temperature of the refrigerator drops to the shutdown point, the refrigeration electric damper is closed, and all the cooling capacity is used to cool the freezer. Since the required temperature of the freezer is low and the cooling is slow, the temperature of the refrigerator gradually rises due to heat absorption during the cooling period of the freezer. If the cooling time of the freezer is too long, the temperature of the refrigerator may rise to the startup point. At this time, the refrigeration electric damper in the refrigerator is opened. Under the action of the wind pressure of the refrigeration fan, the return air from the refrigerator and the return air from the freezer are merged again and flow through the evaporator for cooling, and then sent to the refrigerator and the freezer respectively. This cycle continues until the freezer and the refrigerator reach the set temperature at the same time. At this time, there is no cooling demand and the compressor stops.

[0040] To prevent the refrigerator and freezer from failing to meet the refrigeration requirements at the same time, which would cause the compressor to not stop, the compressor will speed up and increase the cooling capacity after it has been running continuously for a period of time, so that the refrigerator and freezer can meet the refrigeration requirements at the same time as soon as possible.

[0041] As mentioned in the background technology, the comprehensive power consumption of the refrigerator is the power detected when the refrigerator enters the energy-saving state. When the refrigerator is conducting a power consumption test, the ambient temperature is stable and the door is not opened for a long time. The compressor will run at a low speed. At this time, the stable operating power is reduced. Although the start-up rate will increase, the daily power consumption will be reduced overall.

[0042] The existing refrigerator power consumption test method is as follows: first, the ambient temperature is maintained at a certain temperature, such as 32°C, and the refrigerator is powered on. If no door opening action is detected within a specified time, such as 24 hours, the refrigerator is considered to be in energy-saving state, and the power consumption test is then started. In the energy-saving state, the compressor runs at a low speed, the power consumption is reduced, the steady-state power consumption and defrosting power consumption are collected, and the average daily power consumption corresponding to the ambient temperature of 32°C is calculated. If the average daily power consumption is within the specified range, the power consumption test of the refrigerator is qualified. If the average daily power consumption exceeds the declared value by a certain range, the power consumption of the refrigerator is unqualified.

[0043] From the above, we can see that inappropriate selection of low speed may cause the compressor to continue to operate for a long time. High speed can make the refrigerator and freezer meet the refrigeration needs as soon as possible, but it will also cause the compressor to operate at a higher power and a surge in daily power consumption. Therefore, it is necessary to reasonably select the operating speed of the compressor in an energy-saving state.

[0044] In view of the problem of compressor speed selection during the above power consumption test process, the present invention proposes a method for detecting the power consumption of a refrigerator.

[0045] During the test, after the refrigerator has been running stably for a period of time, when the functional parameters remain unchanged and no door opening or closing is detected, the refrigerator enters the energy-saving state. In this state, the defrosting times and the compressor speed are reduced, and the control methods of other electrical components remain basically unchanged.

[0046] The power consumption detection method proposed by the present invention comprises:

[0047] Under the set ambient temperature, select a low speed S1 and a high speed S2;

[0048] The compressor runs at a low speed S1 for a period of time t and then switches to a high speed S2;

[0049] Collect the steady-state power consumption and defrosting power consumption of the refrigerator, and calculate the daily power consumption at the set ambient temperature.

[0050] The calculation of power consumption of refrigerators belongs to the prior art. The improvement of the present invention lies in the selection of compressor speed and the selection of maintenance time. Therefore, the calculation of power consumption will not be further explained.

[0051] The present invention scientifically selects the initial operating speed of the compressor during testing, and reasonably and dynamically adjusts the compressor speed, so as to maintain the power consumption within the required limit range, and has obvious energy-saving effect.

[0052] The selection of the compressor speed is as follows: select a set of arithmetic progressions as the compressor speed, make the refrigerator run in an energy-saving state, record the steady-state power at the corresponding speed and the number of times the refrigeration electric damper is opened / the refrigeration electric damper is closed in a single startup cycle of the compressor, select the compressor speed corresponding to the lowest power and the higher number of times the refrigeration electric damper is opened / the refrigeration electric damper is closed as the low speed S1; select the compressor speed corresponding to the lowest number of times the refrigeration electric damper is opened / the refrigeration electric damper is closed and the lower power as the high speed S2.

[0053] The present invention scientifically selects the initial operating speed of the compressor during testing, and reasonably and dynamically adjusts the compressor speed, so as to maintain the power consumption within the required limit range, and has obvious energy-saving effect.

[0054] The number of times the refrigeration electric damper is opened / closed is defined as follows: For a refrigerator-freezer, assuming that both the refrigerator and freezer need to be cooled, the refrigeration electric damper will be opened, and the refrigeration temperature will be lowered. This is the first cooling of the refrigerator. Since the refrigeration temperature is 4°C, it can be lowered quickly. At this time, the refrigeration electric damper is closed, but the freezer needs to be lowered to -18°C, so the compressor needs to continue to run at this time, and the freezer temperature continues to drop. This is the first cooling of the freezer; during the freezing period, the refrigerator temperature will rise. At this time, the refrigeration electric damper needs to be opened to cool the refrigerator. This is the second cooling. After the refrigerator temperature drops, the refrigeration electric damper is closed, and only the freezer continues to cool. This is the second cooling of the freezer, and so on.

[0055] Furthermore, in order to avoid the compressor running at a low speed and causing long-term refrigeration without stopping, it is necessary to reasonably stipulate the maintenance time of the low-speed operation and determine how long the compressor will speed up and the steady-state power will be low.

[0056] Furthermore, in order to shorten the matching test cycle, the compressor speed can also be independently controlled according to the refrigeration and freezing requests. The specific control method is as follows:

[0057] When there is a need for refrigeration, the temperature of the cold storage room is high and the required cooling capacity is low. At this time, the compressor runs at a low speed to cool the cold storage room. When the temperature of the cold storage room meets the requirement, the damper is closed. At this time, the compressor runs at a high speed to cool the freezer room.

[0058] Furthermore, within a single compressor startup cycle, the number of times the refrigeration electric damper operates is recorded. If the number of times the refrigeration electric damper operates is large, that is, when the temperature of the refrigerator compartment meets the requirements, the temperature of the refrigerator compartment rises during the cooling of the freezer compartment and needs to be cooled again, indicating that the cooling capacity for cooling the freezer compartment is insufficient. At this time, it is necessary to increase the operating speed of the compressor during the cooling of the freezer compartment, thereby shortening the time for the temperature of the refrigerator compartment to rise, or to increase the operating speed of the compressor during the cooling of the refrigerator compartment, thereby reducing the amplitude of the temperature rise in the freezer compartment and shortening the time for cooling the freezer compartment.

[0059] By controlling the compressor speed, the compressor speed (i.e. cooling capacity) is matched with the compartment temperature, thereby reducing the power consumption of the entire refrigerator.

[0060] In one embodiment, assume that the ambient temperature is 32°C, the set temperature of the refrigerator compartment is 4°C, the set temperature of the freezer compartment is -18°C, and a set of arithmetic progressions are selected, such as CS1, CS1+60, CS3+120... In this embodiment, CS1 is selected as 1200r. First, the compressor runs at a speed of CS1. After the system is stable, the average power P1 under stable operation is recorded; then, the compressor speed is adjusted to CS1+60 rpm, and after it is stable, the stable operation average power P2 is recorded; and so on, a series of stable operation average powers under compressor speeds are obtained. In the low speed range, the compressor operating speed corresponding to the lower power is selected, recorded as low speed S1; in the high speed range, the compressor operating speed corresponding to the lower power is selected, recorded as high speed S2. Refer to Figure 2 and Figure 3 It can be seen that the value corresponding to the low speed S1 is 1500r, and the speed corresponding to the high speed S2 is 1800r. Figure 3 From the data in the table, we can see that when the compressor speed gradually increases to 1500r and 1800r, the number of times the refrigeration electric damper is opened / closed changes significantly, from 3 / 3 to 1 / 1. At these two speeds, the power consumption at low speed S1 and high speed S2 is relatively low.

[0061] Figure 3 The refrigeration integral in the table refers to the integrated average temperature of the temperature of the refrigeration room collected by multiple thermocouples arranged in the refrigeration room. For example, if there are three thermocouples arranged in the refrigeration room and the collected temperatures are T1, T2, and T3 respectively, then the refrigeration integral average value refers to the integrated average temperature obtained by averaging the three temperature points. The same applies to the variable temperature integral and the freezing integral.

[0062] from Figure 3 It can be seen that when the compressor speed is 1500r, the power consumption is the lowest, and the number of times the refrigeration electric damper is opened / the refrigeration electric damper is closed is 3 / 3 (it is generally believed that no more than 3 / 3 is more appropriate because the compressor will not be shut down for a long time). When the compressor speed is 1800r, the power consumption is higher, but the number of times the refrigeration electric damper is opened / the refrigeration electric damper is closed is 1 / 1, which meets the requirements of rapid cooling of the room and the power consumption is not too high.

[0063] After selecting high and low speeds, the following problems still need to be solved: When testing power consumption, the compressor starts running at a low speed first. After running for a period of time, the refrigerator and freezer still cannot meet the refrigeration needs at the same time. In order to avoid the compressor from stopping for a long time, the compressor is increased to a high speed to make the temperature of the refrigerator and freezer meet the conditions as soon as possible. Although the instantaneous power of low speed is low, the operation time is long and the daily power consumption may not be low; similarly, the low speed is maintained for a short time and then increased to a high speed. Although the total operation time is reduced, the power is higher and the daily power consumption may not be low. Therefore, it is very important to choose the time opportunity to increase from low speed to high speed.

[0064] Figure 4 1 is a flow chart of a first embodiment of selecting a compressor speed and a maintenance time.

[0065] First, select the speed of the compressor: select a set of arithmetic progression as the speed of the compressor, make the refrigerator run in an energy-saving state, record the steady-state power at the corresponding speed and the number of times the refrigeration electric damper is opened / the refrigeration electric damper is closed in a single startup cycle of the compressor, and select the compressor speed corresponding to the lowest power and the higher number of times the refrigeration electric damper is opened / the refrigeration electric damper is closed as the low speed S1; select the compressor speed corresponding to the lowest number of times the refrigeration electric damper is opened / the refrigeration electric damper is closed and the lower power as the high speed S2.

[0066] Then, the maintenance time t of low speed operation is determined by the number of times the refrigeration electric damper is opened / closed:

[0067] If the refrigerator is testing power consumption, when the average temperature of the refrigerator / freezer meets the requirement of 4 / -18℃ or below, the number of times the refrigeration electric damper is opened / closed does not exceed 3 / 3 times, and the single startup cycle is T, considering the differences in refrigerators, the maintenance time t of the compressor low speed S1 operation can be set to t1+△t, △t is the allowable error value, preferably 15 minutes. As long as the single startup time of the compressor exceeds t1+15 minutes without stopping during the actual operation of the refrigerator, it needs to be increased to high speed S2.

[0068] If during the power consumption test of the refrigerator, when the average temperature of the refrigerator compartment / freezer compartment meets the requirement of 4 / -18℃ or below, and the number of times the refrigerator electric damper is opened / closed exceeds 3 / 3 times, it is necessary to conduct an experiment to determine the time t required for the compressor to maintain the low speed S1 before increasing to the high speed S2. The specific method is:

[0069] Select a set of time series: t1, t1+20min, t1+40min..., first make the compressor run at low speed S1 for time t1, after the temperature curve is stable, record the average power P1 of stable operation corresponding to the time t1; then, adjust the low speed S1 to maintain the operation time t1+20min, after it is stable, record the stable operation average power P2 corresponding to the time t1+20min; and so on, obtain a set of stable operation average powers under compressor speeds, and select the maintenance time corresponding to the low speed S1 under lower power as the target value of time.

[0070] The above method can be used to determine the maintenance time of the low speed S1, high speed S2 and low speed S1 operations, thereby obtaining a relatively low power consumption of the refrigerator test.

[0071] In addition to the above-mentioned method of selecting the maintenance time to achieve low power consumption, it is also possible not to restrict the operation maintenance time of the low speed S1, but to adopt the following method to control the speed increase of the compressor. Figure 5 The present invention is a flow chart of another embodiment of selecting the compressor speed and the maintenance time.

[0072] First, select the speed of the compressor: select a set of arithmetic progression as the speed of the compressor, make the refrigerator run in an energy-saving state, record the steady-state power at the corresponding speed and the number of times the refrigeration electric damper is opened / the refrigeration electric damper is closed in a single startup cycle of the compressor, and select the compressor speed corresponding to the lowest power and the higher number of times the refrigeration electric damper is opened / the refrigeration electric damper is closed as the low speed S1; select the compressor speed corresponding to the lowest number of times the refrigeration electric damper is opened / the refrigeration electric damper is closed and the lower power as the high speed S2.

[0073] Then select the time to increase the compressor speed: the compressor runs at a low speed S1, and when the refrigeration electric damper is closed and the freezer temperature is lower than the set temperature, the compressor speed is increased to S2. Alternatively, the compressor runs at a low speed S1, and when the refrigeration electric damper moves a set number of times (for example, three times), the compressor speed is increased to S2.

[0074] The specific control rules are as follows:

[0075] 1. When there is a refrigeration demand in the cold storage room, the electric damper of the cold storage room opens, and the compressor starts to run at a low speed S1. When the refrigeration temperature drops to the shutdown point, the electric damper of the cold storage room closes;

[0076] 2. When the temperature of the freezer compartment is higher than the start-up point, the compressor continues to run at a low speed S1. At this time, the refrigeration capacity produced by the compressor is only used to cool the freezer compartment. During this period, the temperature of the refrigerator compartment gradually rises. When it reaches the refrigeration start-up point, the refrigeration electric damper opens again. When the refrigeration temperature drops to the shutdown point, the refrigeration electric damper closes. At this time, it is detected whether the freezing temperature is lower than the start-up point;

[0077] If it is lower than a certain value (allowable error value △t) of the start-up point, △t is preferably 0.5℃, the compressor will increase to a higher speed S2 to quickly cool the freezing compartment;

[0078] If it is not lower than a certain value of the start-up point, the compressor will still run at a lower speed S1.

[0079] To avoid the temperature of the refrigerator and freezer compartments not being able to meet the requirements for a long time, causing the compressor to run all the time, when the compressor does not stop, and the number of refrigeration and cooling times n reaches three times, that is, the refrigeration electric damper moves three times (the refrigeration electric damper opens and the electric damper closes as one time), the compressor speed increases to high speed S2 for operation.

[0080] The above method can also be used to determine the maintenance time of the low speed S1, high speed S2 and low speed S1 operations, thereby obtaining a relatively low power consumption for the refrigerator test.

[0081] In order to ensure that the power consumption of the refrigerator is maintained within a relatively low range when in an energy-saving state, the present invention also proposes a refrigerator that scientifically selects the compressor speed, reasonably and dynamically adjusts the compressor speed, maintains the power consumption within the required limit range, and has a significant energy-saving effect.

[0082] It should be pointed out that, for those skilled in the art, several deformations and changes can be made without departing from the concept of the present invention, and these deformations and changes should all fall within the protection scope of the claims of the present invention.

Claims

1. A method for detecting power consumption of a refrigerator, characterized in that: include: Under the set ambient temperature, a low speed and a high speed are selected: a set of arithmetic progressions are selected as the speed of the compressor, so that the refrigerator operates in an energy-saving state, and the steady-state power at the corresponding speed and the number of times the refrigeration electric damper is opened / closed in a single startup cycle of the compressor are recorded. The compressor speed corresponding to the lowest power and the higher number is selected as the low speed S1; the compressor speed corresponding to the lowest number and the lower power is selected as the high speed S2; The compressor runs at a low speed for a period of time and then switches to a high speed. When the number of times the refrigeration electric damper is opened / closed exceeds the set number, a set of time series is selected to record the steady-state power under the corresponding time and the number of times the refrigeration electric damper is opened / closed in a single startup cycle of the compressor. The time corresponding to the lowest power and the lowest number is selected as the maintenance time of the low speed operation. When the number of times the refrigeration electric damper is opened / closed does not exceed the set number, the sum of the single startup cycle of the compressor and the allowable error is used as the maintenance time of the low speed operation. Collect the steady-state power consumption and defrosting power consumption of the refrigerator, and calculate the daily power consumption at the set ambient temperature.

2. The detection method according to claim 1, characterized in that The higher number is 3 / 3 times.

3. The detection method according to claim 1, characterized in that The minimum number of times is 1 / 1 time.

4. The detection method according to claim 1, characterized in that The low speed is 1500r, and the high speed is 1800r.

5. The detection method according to claim 1, characterized in that The setting number of times is three times.

6. A method for detecting power consumption of a refrigerator, characterized in that: include: Under the set ambient temperature, a low speed and a high speed are selected: a set of arithmetic progressions are selected as the speed of the compressor, so that the refrigerator operates in an energy-saving state, and the steady-state power at the corresponding speed and the number of times the refrigeration electric damper is opened / closed in a single startup cycle of the compressor are recorded. The compressor speed corresponding to the lowest power and the higher number is selected as the low speed S1; the compressor speed corresponding to the lowest number and the lower power is selected as the high speed S2; The compressor switches to high speed operation after running at a low speed for a period of time, and the low speed operation maintenance time is determined as follows: the compressor runs at a low speed, and when the refrigeration electric damper is closed and the temperature of the freezer compartment is lower than the set temperature, the compressor speed is increased to high speed operation; or, the compressor runs at a low speed, and when the refrigeration electric damper is opened and closed for a set number of times, the compressor speed is increased to high speed operation; Collect the steady-state power consumption and defrosting power consumption of the refrigerator, and calculate the daily power consumption at the set ambient temperature.

7. The detection method according to claim 6, characterized in that The higher number is 3 / 3 times.

8. The detection method according to claim 6, characterized in that: The minimum number of times is 1 / 1 time.

9. The detection method according to claim 6, characterized in that: The low speed is 1500r, and the high speed is 1800r.

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