Fault judgment method and device for electromagnetic valve of refrigeration equipment and refrigeration equipment

Abstract

According to the fault judgment method and device for the electromagnetic valve of the refrigeration equipment and the refrigeration equipment, the situation that the electromagnetic valve is blocked can be found in time according to the change trend of the temperature difference between every two of the refrigerating chamber, the freezing chamber and the air inlet of the electromagnetic valve in the refrigeration cycle time, and the self-detection capacity of a refrigerator is improved; the invisible maintenance cost of the refrigeration problem is reduced, and the after-sales maintenance efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to a fault judgment method and device for a solenoid valve of refrigeration equipment, and the refrigeration equipment. Background Art

[0002] Current causes of solenoid valve jams in refrigeration equipment include structural design flaws, impurity accumulation mechanisms, and incompatible materials. Corresponding methods for preventing solenoid valve jams include optimizing anti-jamming structures, implementing impurity prevention and control technologies, and intelligent detection and maintenance. These methods primarily prevent and predict solenoid valve failures by optimizing the housing structure, adding filters, and measuring the motor's drive current. However, these methods are costly, and solenoid valves used in refrigeration equipment face cost constraints. Therefore, a simple and fast method for detecting solenoid valve failures is needed.

[0003] When users or maintenance personnel discover problems with refrigeration equipment, they can only judge that certain components of the refrigeration equipment, including the solenoid valve, are faulty based on abnormal frosting or condensation on the valve body, frequent system starts and stops, poor cooling effect or no cooling, etc. There is no direct fault prompt to determine that there is a problem in a certain position of the solenoid valve, which greatly reduces the efficiency of after-sales maintenance. Summary of the Invention

[0004] In order to at least overcome the above-mentioned deficiencies in the prior art, the present invention aims to provide a method for diagnosing a fault of a solenoid valve of a refrigeration device, wherein the refrigeration device includes a freezer compartment, a refrigerator compartment, and a solenoid valve, wherein the solenoid valve includes an air inlet, a first air outlet, and a second air outlet; the first air outlet is used to cool the freezer compartment; the second air outlet is used to cool the refrigerator compartment; The refrigeration equipment further comprises a first temperature sensor, a second temperature sensor and a third temperature sensor for detecting the real-time temperatures of the air inlet of the solenoid valve, the freezing chamber and the refrigerating chamber respectively; The method comprises: Acquire multiple first temperature values, second temperature values, and third temperature values ​​within a refrigeration cycle; wherein the first temperature value, the second temperature value, and the third temperature value are temperature values ​​of the air inlet of the solenoid valve, the freezer compartment, and the refrigerator compartment, respectively; a plurality of first temperature differences, second temperature differences, and third temperature differences are obtained according to the plurality of first temperature values, second temperature values, and third temperature values; wherein the first temperature difference is the difference between the third temperature value and the first temperature value; the second temperature difference is the difference between the second temperature value and the first temperature value; and the third temperature difference is the absolute value of the difference between the third temperature value and the second temperature value; Obtaining a first temperature difference change curve, a second temperature difference change curve, and a third temperature difference change curve within a refrigeration cycle according to the plurality of the first temperature differences, the second temperature differences, and the third temperature differences; The stuck position of the solenoid valve is determined according to the corresponding relationship between the first temperature difference change curve, the second temperature difference change curve, and the third temperature difference change curve and at least three first predetermined conditions in a refrigeration cycle.

[0005] In a possible implementation, before performing the step of obtaining a plurality of first temperature differences, second temperature differences, and third temperature differences based on the plurality of first temperature values, second temperature values, and third temperature values, the method further includes: A first temperature value change curve, a second temperature value change curve, and a third temperature value change curve within a refrigeration cycle are generated according to the plurality of the first temperature values, the second temperature values, and the third temperature values; detecting a correspondence between a first temperature value change curve, a second temperature value change curve, and a third temperature value change curve within a refrigeration cycle and at least three second predetermined conditions; If there is a corresponding relationship, the step of obtaining a plurality of first temperature differences, a second temperature difference and a third temperature difference according to the plurality of first temperature values, second temperature values ​​and third temperature values ​​is performed.

[0006] In a possible implementation, the step of detecting a correspondence between a first temperature value change curve, a second temperature value change curve, and a third temperature value change curve within a refrigeration cycle and at least three second predetermined conditions includes: Detecting whether the first temperature value change curve is a straight line that is stable at a first set threshold value during a refrigeration cycle, and whether the second temperature value change curve and the third temperature value change curve are curves that continuously increase until they stabilize at a second set threshold value; wherein the first set threshold value is the set temperature of the refrigerant of the refrigeration equipment; and the second set threshold value is the ambient temperature; If so, it corresponds to one of the second predetermined conditions.

[0007] In a possible implementation, the step of determining the jam location of the solenoid valve based on a correspondence between the first temperature difference change curve, the second temperature difference change curve, and the third temperature difference change curve and at least three first predetermined conditions within a refrigeration cycle includes: Detecting whether the first temperature difference change curve and the second temperature difference change curve are curves that continuously increase until they stabilize at a third set threshold, and whether the third temperature difference change curve is a curve that continuously decreases until it stabilizes at a fourth set threshold within a refrigeration cycle; wherein the third set threshold is the difference between the second set threshold and the first set threshold; and the fourth set threshold is 0; If so, it corresponds to one of the first predetermined conditions; the solenoid valve of the refrigeration equipment is stuck at both the second air outlet and the first air outlet.

[0008] In a possible implementation, the step of detecting a correspondence between a first temperature value change curve, a second temperature value change curve, and a third temperature value change curve within a refrigeration cycle and at least three second predetermined conditions includes: Detecting whether the first temperature value change curve is a straight line that is stable at a first set threshold value, whether the second temperature value change curve is a straight line that is stable at a fifth set threshold value, and whether the third temperature value change curve is a curve that continuously increases until it stabilizes at a second set threshold value within a refrigeration cycle; wherein the first set threshold value is the set temperature of the refrigeration system of the refrigeration equipment; the second set threshold value is the ambient temperature; and the fifth set threshold value is the set temperature of the freezer compartment of the refrigeration equipment; If so, it corresponds to one of the second predetermined conditions.

[0009] In a possible implementation, the step of determining the jam location of the solenoid valve based on a correspondence between the first temperature difference change curve, the second temperature difference change curve, and the third temperature difference change curve and at least three first predetermined conditions within a refrigeration cycle includes: Detecting whether the first temperature difference change curve is a curve that continuously increases until it stabilizes at a third set threshold value within a refrigeration cycle; whether the second temperature difference change curve is a straight line that stabilizes at a sixth set threshold value; and whether the third temperature difference change curve is a curve that continuously increases until it stabilizes at a seventh set threshold value; wherein the third set threshold value is the difference between the second set threshold value and the first set threshold value; the sixth set threshold value is the difference between the fifth set threshold value and the first set threshold value; and the seventh set threshold value is the difference between the second set threshold value and the fifth set threshold value; If so, it corresponds to one of the first predetermined conditions, and the solenoid valve of the refrigeration device is stuck at the second air outlet.

[0010] In a possible implementation, the step of detecting a correspondence between a first temperature value change curve, a second temperature value change curve, and a third temperature value change curve within a refrigeration cycle and at least three second predetermined conditions includes: Detecting whether the first temperature value change curve is a straight line that is stable at a first set threshold value within a refrigeration cycle, whether the second temperature value change curve is a curve that continuously increases until it stabilizes at a second set threshold value, and whether the third temperature value change curve is a straight line that is stable at an eighth set threshold value; wherein the first set threshold value is the set temperature of the refrigeration system of the refrigeration equipment; the second set threshold value is the ambient temperature; and the eighth set threshold value is the set temperature of the refrigeration compartment of the refrigeration equipment; If so, it corresponds to one of the second predetermined conditions.

[0011] In a possible implementation, the step of determining the jam location of the solenoid valve based on a correspondence between the first temperature difference change curve, the second temperature difference change curve, and the third temperature difference change curve and at least three first predetermined conditions within a refrigeration cycle includes: Detecting whether the first temperature difference change curve is a straight line that stabilizes at a ninth set threshold value within a refrigeration cycle; whether the second temperature difference change curve is a curve that continuously increases until it stabilizes at a third set threshold value; and whether the third temperature difference change curve is a curve that continuously increases until it stabilizes at a tenth set threshold value; wherein the third set threshold value is the difference between the second set threshold value and the first set threshold value; the ninth set threshold value is the difference between the eighth set threshold value and the first set threshold value; and the tenth set threshold value is the difference between the second set threshold value and the eighth set threshold value; If so, it corresponds to one of the first predetermined conditions, and the solenoid valve of the refrigeration device is stuck at the first air outlet.

[0012] The present invention also provides a fault judgment device for a solenoid valve of a refrigeration device, the device comprising: an acquisition module, configured to acquire a plurality of first temperature values, a second temperature value, and a third temperature value within a refrigeration cycle; wherein the first temperature value, the second temperature value, and the third temperature value are temperature values ​​of the air inlet of the solenoid valve, the freezer compartment, and the refrigerator compartment, respectively; a first processing module, configured to obtain a plurality of first temperature differences, second temperature differences, and third temperature differences according to a plurality of first temperature values, second temperature values, and third temperature values; wherein the first temperature difference is the difference between the third temperature value and the first temperature value; the second temperature difference is the difference between the second temperature value and the first temperature value; and the third temperature difference is the difference between the third temperature value and the second temperature value; a second processing module, configured to obtain a first temperature difference change curve, a second temperature difference change curve, and a third temperature difference change curve within a refrigeration cycle according to a plurality of the first temperature differences, the second temperature differences, and the third temperature differences; The judgment module is used to judge the jam location of the solenoid valve according to the correspondence between the first temperature difference change curve, the second temperature difference change curve and the third temperature difference change curve and at least three first predetermined conditions in a refrigeration cycle.

[0013] The present invention also provides a refrigeration device, including the aforementioned fault judgment device for the solenoid valve of the refrigeration device.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a fault judgment method and device for the solenoid valve of a refrigeration device, and the refrigeration device. By analyzing the changing trend of the temperature difference between the refrigerator compartment, the freezer compartment and the air inlet of the solenoid valve during a refrigeration cycle, it is possible to promptly detect where the solenoid valve is stuck, thereby improving the self-detection capability of the refrigerator, reducing the invisible maintenance cost of refrigeration problems, and improving after-sales maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a flow chart of a method for determining a fault of a solenoid valve of a refrigeration device provided in this embodiment; Figure 2 A second flow chart of a method for determining a fault of a solenoid valve of a refrigeration device provided in this embodiment; Figure 3 This is a schematic structural diagram of a fault diagnosis device for a solenoid valve of a refrigeration device provided in this embodiment. DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0019] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0020] In the description of the present invention, it should be noted that the terms "upper" and "lower," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second," etc., are used solely for distinction and should not be construed as indicating or implying relative importance.

[0021] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0022] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0023] It should be noted that, in the absence of conflict, different features in the embodiments of the present invention may be combined with each other.

[0024] The inventors have found that when users or maintenance personnel discover problems with refrigeration equipment, they can only judge that certain components of the refrigeration equipment, including the solenoid valve, have failed based on abnormal frosting or condensation on the valve body, frequent system starts and stops, poor cooling effect or no cooling, etc. There is no direct fault prompt to determine that there is a problem at a certain position of the solenoid valve, which greatly reduces the efficiency of after-sales maintenance.

[0025] In view of this, the present invention provides a fault judgment method for the solenoid valve of a refrigeration equipment, wherein the refrigeration equipment includes a freezer compartment, a refrigerator compartment and a solenoid valve, and the solenoid valve includes an air inlet, a first air outlet and a second air outlet; the first air outlet is used to cool the freezer compartment; the second air outlet is used to cool the refrigerator compartment.

[0026] It should be noted that, in addition to the freezer compartment and the refrigerator compartment, the refrigeration equipment may also include other storage compartments, such as a variable temperature room.

[0027] In this embodiment, since the temperatures of the multiple storage compartments of the refrigeration equipment are different, and the temperatures of the multiple storage compartments are different from the air inlet of the solenoid valve, the fault conditions of the multiple air outlets of the solenoid valve can be judged by the changing trend of the temperature difference between the air inlet of the solenoid valve and the multiple storage compartments.

[0028] The refrigeration equipment further includes a first temperature sensor, a second temperature sensor, and a third temperature sensor for detecting the real-time temperatures of the air inlet of the solenoid valve, the freezing chamber, and the refrigerating chamber, respectively.

[0029] In this embodiment, the first temperature sensor, the second temperature sensor, and the third temperature sensor may include thermistor sensors.

[0030] Please refer to Figure 1 , the method includes the following steps.

[0031] Step S11, obtaining multiple first temperature values, second temperature values ​​and third temperature values ​​in a refrigeration cycle; wherein the first temperature value, the second temperature value and the third temperature value are the temperature values ​​of the air inlet of the solenoid valve, the freezer compartment and the refrigerator compartment respectively.

[0032] In this step, a refrigeration cycle refers to the time required for the complete workflow of transferring heat from the refrigeration equipment to the outside air through the circulation of refrigerant in the refrigeration equipment, and at the same time, each storage compartment reaches the set temperature, thereby achieving the refrigeration effect.

[0033] Step S12, obtaining multiple first temperature differences, second temperature differences and third temperature differences based on multiple first temperature values, second temperature values ​​and third temperature values; wherein the first temperature difference is the difference between the third temperature value and the first temperature value; the second temperature difference is the difference between the second temperature value and the first temperature value; and the third temperature difference is the absolute value of the difference between the third temperature value and the second temperature value.

[0034] Since there is a certain amount of energy loss when the refrigerant cools the freezer and refrigerator compartments from the solenoid valve in the refrigeration equipment, there is a second temperature difference between the freezer compartment and the air inlet of the solenoid valve, and a first temperature difference between the refrigerator compartment and the air inlet of the solenoid valve; since the freezer compartment is generally shorter than the air inlet of the solenoid valve, and the freezer compartment and refrigerator compartment in the refrigeration equipment each have different functions and different set temperatures, there is a third temperature difference between the freezer compartment and the refrigerator compartment.

[0035] Step S13: obtaining a first temperature difference change curve, a second temperature difference change curve, and a third temperature difference change curve within a refrigeration cycle according to the plurality of the first temperature differences, the second temperature differences, and the third temperature differences.

[0036] During the operation of the refrigeration equipment, if a fault occurs at the air outlet of the solenoid valve, the first temperature difference change curve, the second temperature difference change curve and the third temperature difference change curve will show different trends. Based on these trends, the fault problem of the air outlet of the solenoid valve can be judged in time.

[0037] Step S14 , determining the jam location of the solenoid valve according to the corresponding relationship between the first temperature difference change curve, the second temperature difference change curve, and the third temperature difference change curve and at least three first predetermined conditions within a refrigeration cycle.

[0038] In this step, since the refrigeration equipment in the present invention includes at least a freezer compartment and a refrigerator compartment, if the air outlet of the solenoid valve fails, the following three fault conditions may occur: the first air outlet fails, the second air outlet fails, and both the first air outlet and the second air outlet fail. If each fault condition corresponds to only one first predetermined condition, then there are at least three first predetermined conditions.

[0039] For refrigeration equipment with more storage compartments with different set temperatures, the location of the solenoid valve jam can also be determined based on the temperature difference trends between each storage compartment and the solenoid valve's air inlet and their correspondence with multiple first predetermined conditions. For example, a four-way solenoid valve can be used for compartments with three different set temperatures. In this case, there are at least seven possible fault conditions. If each fault condition corresponds to only one first predetermined condition, then there are at least seven first predetermined conditions. This method is applicable to refrigeration equipment with a variety of storage compartments.

[0040] Compared to the method of using only the temperature or temperature change trend of the freezer, refrigerator, and air inlet of the solenoid valve to determine the damage of the solenoid valve, the method of using the temperature difference change trend in this embodiment is more accurate. For example, if there is a problem with the damper of the refrigeration equipment, the temperature of the freezer and refrigerator will change. Therefore, the method of using only the temperature or temperature change trend of the freezer, refrigerator, and air inlet of the solenoid valve to determine the damage of the solenoid valve is not accurate. By using the temperature difference change trend between the refrigerator, freezer, and air inlet of the solenoid valve within a refrigeration cycle, it is possible to accurately and promptly detect where the solenoid valve is stuck, thereby improving the self-detection capability of the refrigerator, reducing the hidden repair costs of refrigeration problems, and improving maintenance efficiency.

[0041] In one possible implementation, to reduce energy consumption, refer to Figure 2Before executing step S12, the method further includes the following steps.

[0042] Step S21 , obtaining a first temperature value change curve, a second temperature value change curve, and a third temperature value change curve within a refrigeration cycle according to the plurality of the first temperature values, the second temperature values, and the third temperature values.

[0043] In this embodiment, if the solenoid valve of the refrigeration equipment fails, the temperature of the storage compartment in the refrigeration equipment will inevitably change. Therefore, before confirming where the solenoid valve of the refrigeration equipment fails, real-time temperature monitoring can be performed to obtain the first temperature value change curve, the second temperature value change curve and the third temperature value change curve within a refrigeration cycle. If an abnormal temperature change trend occurs, the subsequent steps are executed.

[0044] Step S22 , detecting corresponding relationships between the first temperature value change curve, the second temperature value change curve, and the third temperature value change curve within a refrigeration cycle and at least three second predetermined conditions.

[0045] In this step, since the changing trends of the first temperature value, the second temperature value and the third temperature value caused by faults in different parts of the refrigeration equipment are different, a preliminary judgment can be made based on the correspondence between the first temperature value change curve, the second temperature value change curve and the third temperature value change curve and the second predetermined condition.

[0046] Step S23: If there is a corresponding relationship, the step of obtaining a plurality of first temperature differences, a second temperature difference and a third temperature difference according to the plurality of first temperature values, second temperature values ​​and third temperature values ​​is performed.

[0047] If there is no corresponding relationship, it is necessary to find other fault parts of the refrigeration equipment through other methods.

[0048] In a possible implementation, step S22 includes the following sub-steps.

[0049] Step S2211, detecting whether the first temperature value change curve in a refrigeration cycle is a straight line that is stable at a first set threshold, and whether the second temperature value change curve and the third temperature value change curve are curves that continue to rise until they stabilize at a second set threshold; wherein, the first set threshold is the set temperature of the refrigerant of the refrigeration equipment; and the second set threshold is the ambient temperature.

[0050] Step S2212: If yes, then it corresponds to one of the second predetermined conditions.

[0051] In a possible implementation, step S14 includes the following sub-steps.

[0052] Step S1411, detecting whether the first temperature difference change curve and the second temperature difference change curve are curves that continuously increase until they stabilize at a third set threshold value during a refrigeration cycle, and whether the third temperature difference change curve is a curve that continuously decreases until it stabilizes at a fourth set threshold value; wherein the third set threshold value is the difference between the second set threshold value and the first set threshold value; and the fourth set threshold value is 0.

[0053] Step S1412: If yes, it corresponds to one of the first predetermined conditions; the solenoid valve of the refrigeration equipment is stuck at both the second air outlet and the first air outlet.

[0054] In this embodiment, when the refrigeration equipment is running, if both the second air outlet and the first air outlet of the solenoid valve are stuck, the temperature of the refrigerator and the freezer will rise to the ambient temperature, while the temperature of the air inlet remains unchanged. The first temperature difference change curve and the second temperature difference change curve are both curves that continue to rise until they stabilize at the difference between the ambient temperature and the air inlet of the solenoid valve, and the third temperature difference change curve is a curve that continues to decrease until it becomes 0.

[0055] For example, during the operation of the refrigeration equipment, if the refrigeration equipment has a stable refrigeration cycle of 360 minutes, the first setting threshold is set to -20°C, the second setting threshold is set to 25°C, the third setting threshold is set to 45°C, the fourth setting threshold is set to 0, the setting temperature of the refrigerator compartment is 5°C, and the setting temperature of the freezer compartment is -18°C.

[0056] At time 0, the first temperature value is the first set threshold, the second temperature value and the third temperature value are -18°C and 5°C respectively; the first temperature difference, the second temperature difference and the third temperature difference are 25°C, 2°C and 23°C respectively.

[0057] … At the 120th minute, the first temperature value is the first set threshold, the second temperature value is 10°C, and the third temperature value is 15°C; the first temperature difference is 30°C, the second temperature difference is 35°C, and the third temperature difference is 5°C.

[0058] … At the 240th minute, the first temperature value is the first set threshold, the second temperature value is 20°C, and the third temperature value is 20°C; the first temperature difference is 40°C, the second temperature difference is 40°C, and the third temperature difference is 0.

[0059] … At the 360th minute, the first temperature value is the first set threshold, the second temperature value is 25°C, and the third temperature value is 25°C; the first temperature difference is 45°C, the second temperature difference is 45°C, and the third temperature difference is 0.

[0060] According to the first temperature value, the second temperature value and the third temperature value, the first temperature value change curve, the second temperature value change curve and the third temperature value change curve within this refrigeration cycle can be obtained; according to the first temperature difference, the second temperature difference and the third temperature difference, the first temperature difference change curve, the second temperature difference change curve and the third temperature difference change curve within this refrigeration cycle can be obtained. According to the aforementioned real-time recorded temperature, it can be seen that the first temperature value change curve is a straight line that is continuously stable at -20°C, that is, the first set threshold; while the second temperature value change curve and the third temperature value change curve are curves that continue to rise until they stabilize at 25°C, that is, the second set threshold; the first temperature difference change curve and the second temperature difference change curve are curves that continue to rise to 45°C, that is, the third set threshold; the third temperature difference change curve is a curve that continues to fall until it stabilizes at 0, that is, the fourth set threshold.

[0061] It can be determined that the solenoid valve of the refrigeration equipment is stuck at both the second air outlet and the first air outlet.

[0062] In one possible embodiment, if the fault occurs at the second and first air outlets of the solenoid valve before the refrigeration equipment is started, rather than during continuous operation of the refrigeration equipment, then upon startup of the refrigeration equipment, the second and third temperature value change curves will form a stable straight line, remaining stable at the second set threshold, while the first temperature value change curve will continue to rise until it reaches the first set threshold. Simultaneously, the third temperature difference change curve will also form a stable straight line, remaining stable at 0, while the first and second temperature difference change curves will continue to rise until they reach the third set threshold. In this case, one of the first and second predetermined conditions are also met, and it can be determined that a fault has occurred at the second and first air outlets of the solenoid valve.

[0063] In a possible implementation, step S22 includes the following sub-steps.

[0064] Step S2221, detect whether the first temperature value change curve in a refrigeration cycle is a straight line that is stable at the first set threshold, whether the second temperature value change curve is a straight line that is stable at the fifth set threshold, and whether the third temperature value change curve is a curve that continues to rise until it stabilizes at the second set threshold; wherein, the first set threshold is the set temperature of the refrigeration system of the refrigeration equipment; the second set threshold is the ambient temperature; and the fifth set threshold is the set temperature of the freezer compartment in the refrigeration equipment.

[0065] Step S2222: If yes, it corresponds to one of the second predetermined conditions.

[0066] In a possible implementation, step S14 includes the following sub-steps.

[0067] Step S1421, detecting whether the first temperature difference change curve in a refrigeration cycle is a curve that continues to rise until it stabilizes at a third set threshold; whether the second temperature difference change curve is a straight line that stabilizes at a sixth set threshold, and whether the third temperature difference change curve is a curve that continues to rise until it stabilizes at a seventh set threshold; wherein the third set threshold is the difference between the second set threshold and the first set threshold; the sixth set threshold is the difference between the fifth set threshold and the first set threshold; and the seventh set threshold is the difference between the second set threshold and the fifth set threshold.

[0068] Step S1422: If yes, it corresponds to one of the first predetermined conditions, and the solenoid valve of the refrigeration equipment is stuck at the second air outlet.

[0069] In this embodiment, if the second air outlet of the solenoid valve becomes clogged during operation of the refrigeration device, the cooling effect of the refrigerator compartment will be affected. In this case, the temperature of the refrigerator compartment will rise to the ambient temperature, while the temperatures of the air inlet and the freezer compartment remain unchanged. The first temperature difference change curve is a curve that continuously rises until it stabilizes at the difference between the ambient temperature and the air inlet of the solenoid valve. The second temperature difference change curve is a straight line that stabilizes at the difference between the set temperature of the freezer compartment and the set temperature of the air inlet of the solenoid valve. The third temperature difference change curve is a curve that continuously decreases until it reaches the difference between the ambient temperature and the set temperature of the freezer compartment.

[0070] In one possible embodiment, if the fault occurs at the second air outlet of the solenoid valve before the refrigeration equipment is started, rather than during continuous operation of the refrigeration equipment, then when the refrigeration equipment is just started, the third temperature value change curve will be a stable straight line, always stable at the second set threshold, and the first temperature value change curve and the second temperature value change curve will be curves that continuously decrease and stabilize at the first set threshold and the fifth set threshold, respectively; at the same time, the first temperature difference change curve will be a curve that continuously increases and stabilizes at the third set threshold, the second temperature difference change curve will be a curve that ultimately stabilizes at the sixth set threshold, and the third temperature difference change curve will be a curve that continuously increases and stabilizes at the seventh set threshold. In this case, one of the first predetermined conditions and one of the second predetermined conditions are also met, and it can be determined that a fault has occurred at the second air outlet of the solenoid valve.

[0071] In a possible implementation, step S22 includes the following sub-steps.

[0072] Step S2231, detect whether the first temperature value change curve in a refrigeration cycle is a straight line that is stable at the first set threshold, whether the second temperature value change curve is a curve that continues to rise until it stabilizes at the second set threshold, and whether the third temperature value change curve is a straight line that is stable at the eighth set threshold; wherein, the first set threshold is the set temperature of the refrigeration system of the refrigeration equipment; the second set threshold is the ambient temperature; and the eighth set threshold is the set temperature of the cold storage room in the refrigeration equipment.

[0073] Step S2232: If yes, then it corresponds to one of the second predetermined conditions.

[0074] In a possible implementation, step S14 includes the following sub-steps.

[0075] Step S1431, detecting whether the first temperature difference change curve is a straight line that is stable at the ninth set threshold value during a refrigeration cycle; whether the second temperature difference change curve is a curve that continues to rise until it is stable at the third set threshold value, and whether the third temperature difference change curve is a curve that continues to rise until it is stable at the tenth set threshold value; wherein the third set threshold value is the difference between the second set threshold value and the first set threshold value; the ninth set threshold value is the difference between the eighth set threshold value and the first set threshold value; and the tenth set threshold value is the difference between the second set threshold value and the eighth set threshold value.

[0076] Step S1432: If yes, it corresponds to one of the first predetermined conditions, and the solenoid valve of the refrigeration device is stuck at the first air outlet.

[0077] In this embodiment, if the first air outlet of the solenoid valve becomes clogged during operation of the refrigeration device, the refrigeration effect of the freezer compartment will be affected. In this case, the temperature of the freezer compartment will rise to the ambient temperature, while the temperatures of the air inlet and the refrigerator compartment remain unchanged. The second temperature difference change curve is a curve that continuously rises until it stabilizes at the difference between the ambient temperature and the air inlet of the solenoid valve. The first temperature difference change curve is a straight line that stabilizes at the difference between the set temperature of the refrigerator compartment and the set temperature of the air inlet of the solenoid valve. The third temperature difference change curve is a curve that continuously decreases until it reaches the difference between the ambient temperature and the set temperature of the refrigerator compartment.

[0078] In one possible embodiment, if the first air outlet of the solenoid valve fails before the refrigeration equipment is started, rather than during continuous operation, then when the refrigeration equipment is just started, the second temperature value change curve will be a stable straight line, always stable at the second set threshold, and the first temperature value change curve and the second temperature value change curve will be curves that continuously decrease and stabilize at the first set threshold and the eighth set threshold, respectively; at the same time, the second temperature difference change curve will be a curve that continuously increases and stabilizes at the third set threshold, the first temperature difference change curve will be a curve that ultimately stabilizes at the ninth set threshold, and the third temperature difference change curve will be a curve that continuously increases and stabilizes at the tenth set threshold. In this case, one of the first predetermined conditions and one of the second predetermined conditions are also met, and it can be determined that a fault has occurred at the first air outlet of the solenoid valve.

[0079] Based on the same inventive concept, the present invention also provides a fault judgment device for the solenoid valve of a refrigeration equipment, please refer to Figure 3 , including multiple functional modules that can be stored in a machine-readable storage medium in the form of software. From a functional perspective, the fault judgment device for the solenoid valve of the refrigeration equipment can include an acquisition module, a first processing module, a second processing module and a judgment module.

[0080] An acquisition module is used to acquire multiple first temperature values, second temperature values ​​and third temperature values ​​within a refrigeration cycle; wherein the first temperature value, the second temperature value and the third temperature value are the temperature values ​​of the air inlet of the solenoid valve, the freezer compartment and the refrigerator compartment respectively.

[0081] In this step, the acquisition module can be used to perform Figure 1 As shown in step S11, for a detailed description of the acquisition module, please refer to the description of step S11.

[0082] A first processing module is used to obtain multiple first temperature differences, second temperature differences and third temperature differences based on multiple first temperature values, second temperature values ​​and third temperature values; wherein the first temperature difference is the difference between the third temperature value and the first temperature value; the second temperature difference is the difference between the second temperature value and the first temperature value; and the third temperature difference is the difference between the third temperature value and the second temperature value.

[0083] In this step, the first processing module can be used to perform Figure 1 As shown in step S12, for the detailed description of the first processing module, reference may be made to the description of step S12.

[0084] The second processing module is used to obtain a first temperature difference change curve, a second temperature difference change curve and a third temperature difference change curve within a refrigeration cycle according to the plurality of the first temperature differences, the second temperature differences and the third temperature differences.

[0085] In this step, the second processing module can be used to perform Figure 1 As shown in step S13, for the detailed description of the second processing module, reference may be made to the description of step S13.

[0086] The judgment module is used to judge the jam location of the solenoid valve according to the correspondence between the first temperature difference change curve, the second temperature difference change curve and the third temperature difference change curve and at least three first predetermined conditions in a refrigeration cycle.

[0087] In this step, the judgment module can be used to execute Figure 1 As shown in step S14, for the detailed description of the judgment module, please refer to the description of step S14.

[0088] The present invention also provides a refrigeration device, including the aforementioned fault judgment device for the solenoid valve of the refrigeration device.

[0089] In one possible embodiment, the refrigeration equipment further includes a control module and a display screen. The control module is electrically connected to the refrigeration equipment's solenoid valve fault diagnosis device and is configured to receive a first electrical signal from the refrigeration equipment's solenoid valve fault diagnosis device, the first electrical signal including the location of the solenoid valve jam determined by the refrigeration equipment's solenoid valve fault diagnosis device. The control module is electrically connected to the display screen and is configured to send a second electrical signal to the display screen to display the jam status of the solenoid valve. For example, if both the first and second air outlets are jammed, the display screen displays "E1"; if the first air outlet is jammed, the display screen displays "E2"; and if the second air outlet is jammed, the display screen displays "E3." In this way, when maintenance personnel repair a refrigeration equipment with a faulty solenoid valve, the visual display of the jam fault code can save time and cost in wasted communication between the user and after-sales service, thereby improving maintenance efficiency.

[0090] In summary, the present invention provides a fault judgment method and device for the solenoid valve of a refrigeration equipment, and a refrigeration equipment. By observing the changing trend of the temperature difference between the refrigerator compartment, the freezer compartment and the air inlet of the solenoid valve within a refrigeration cycle, it is possible to promptly detect where the solenoid valve is stuck, thereby improving the self-detection capability of the refrigerator, reducing the invisible maintenance cost of refrigeration problems, and improving after-sales maintenance efficiency.

[0091] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0092] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for determining a fault of a solenoid valve of a refrigeration device, characterized in that: The refrigeration device includes a freezing chamber, a refrigerating chamber and a solenoid valve, wherein the solenoid valve includes an air inlet, a first air outlet and a second air outlet; the first air outlet is used to cool the freezing chamber; the second air outlet is used to cool the refrigerating chamber; The refrigeration equipment further comprises a first temperature sensor, a second temperature sensor and a third temperature sensor for detecting the real-time temperatures of the air inlet of the solenoid valve, the freezing chamber and the refrigerating chamber respectively; The method comprises: Acquire multiple first temperature values, second temperature values, and third temperature values ​​within a refrigeration cycle; wherein the first temperature value, the second temperature value, and the third temperature value are temperature values ​​of the air inlet of the solenoid valve, the freezer compartment, and the refrigerator compartment, respectively; a plurality of first temperature differences, second temperature differences, and third temperature differences are obtained according to the plurality of first temperature values, second temperature values, and third temperature values; wherein the first temperature difference is the difference between the third temperature value and the first temperature value; the second temperature difference is the difference between the second temperature value and the first temperature value; and the third temperature difference is the absolute value of the difference between the third temperature value and the second temperature value; Obtaining a first temperature difference change curve, a second temperature difference change curve, and a third temperature difference change curve within a refrigeration cycle according to the plurality of the first temperature differences, the second temperature differences, and the third temperature differences; The stuck position of the solenoid valve is determined according to the corresponding relationship between the first temperature difference change curve, the second temperature difference change curve, and the third temperature difference change curve and at least three first predetermined conditions in a refrigeration cycle.

2. The method according to claim 1, characterized in that Before performing the step of obtaining a plurality of first temperature differences, second temperature differences, and third temperature differences according to the plurality of first temperature values, second temperature values, and third temperature values, the method further includes: A first temperature value change curve, a second temperature value change curve, and a third temperature value change curve within a refrigeration cycle are generated according to the plurality of the first temperature values, the second temperature values, and the third temperature values; detecting a correspondence between a first temperature value change curve, a second temperature value change curve, and a third temperature value change curve within a refrigeration cycle and at least three second predetermined conditions; If there is a corresponding relationship, the step of obtaining a plurality of first temperature differences, a second temperature difference and a third temperature difference according to the plurality of first temperature values, second temperature values ​​and third temperature values ​​is performed.

3. The method according to claim 2, characterized in that The step of detecting the correspondence between the first temperature value change curve, the second temperature value change curve, and the third temperature value change curve within a refrigeration cycle and at least three second predetermined conditions includes: Detecting whether the first temperature value change curve is a straight line that is stable at a first set threshold value during a refrigeration cycle, and whether the second temperature value change curve and the third temperature value change curve are curves that continuously increase until they stabilize at a second set threshold value; wherein the first set threshold value is the set temperature of the refrigerant of the refrigeration equipment; and the second set threshold value is the ambient temperature; If so, it corresponds to one of the second predetermined conditions.

4. The method according to claim 3, characterized in that The step of determining the jam location of the solenoid valve according to the correspondence between the first temperature difference change curve, the second temperature difference change curve, and the third temperature difference change curve and at least three first predetermined conditions within a refrigeration cycle includes: Detecting whether the first temperature difference change curve and the second temperature difference change curve are curves that continuously increase until they stabilize at a third set threshold, and whether the third temperature difference change curve is a curve that continuously decreases until it stabilizes at a fourth set threshold within a refrigeration cycle; wherein the third set threshold is the difference between the second set threshold and the first set threshold; and the fourth set threshold is 0; If so, it corresponds to one of the first predetermined conditions; the solenoid valve of the refrigeration equipment is stuck at both the second air outlet and the first air outlet.

5. The method according to claim 2, characterized in that The step of detecting the correspondence between the first temperature value change curve, the second temperature value change curve, and the third temperature value change curve within a refrigeration cycle and at least three second predetermined conditions includes: Detecting whether the first temperature value change curve is a straight line that is stable at a first set threshold value, whether the second temperature value change curve is a straight line that is stable at a fifth set threshold value, and whether the third temperature value change curve is a curve that continuously increases until it stabilizes at a second set threshold value within a refrigeration cycle; wherein the first set threshold value is the set temperature of the refrigeration system of the refrigeration equipment; the second set threshold value is the ambient temperature; and the fifth set threshold value is the set temperature of the freezer compartment of the refrigeration equipment; If so, it corresponds to one of the second predetermined conditions.

6. The method according to claim 5, characterized in that The step of determining the jam location of the solenoid valve according to the correspondence between the first temperature difference change curve, the second temperature difference change curve, and the third temperature difference change curve and at least three first predetermined conditions within a refrigeration cycle includes: Detecting whether the first temperature difference change curve is a curve that continuously increases until it stabilizes at a third set threshold value within a refrigeration cycle; whether the second temperature difference change curve is a straight line that stabilizes at a sixth set threshold value; and whether the third temperature difference change curve is a curve that continuously increases until it stabilizes at a seventh set threshold value; wherein the third set threshold value is the difference between the second set threshold value and the first set threshold value; the sixth set threshold value is the difference between the fifth set threshold value and the first set threshold value; and the seventh set threshold value is the difference between the second set threshold value and the fifth set threshold value; If so, it corresponds to one of the first predetermined conditions, and the solenoid valve of the refrigeration device is stuck at the second air outlet.

7. The method according to claim 2, characterized in that The step of detecting the correspondence between the first temperature value change curve, the second temperature value change curve, and the third temperature value change curve within a refrigeration cycle and at least three second predetermined conditions includes: Detecting whether the first temperature value change curve is a straight line that is stable at a first set threshold value within a refrigeration cycle, whether the second temperature value change curve is a curve that continuously increases until it stabilizes at a second set threshold value, and whether the third temperature value change curve is a straight line that is stable at an eighth set threshold value; wherein the first set threshold value is the set temperature of the refrigeration system of the refrigeration equipment; the second set threshold value is the ambient temperature; and the eighth set threshold value is the set temperature of the refrigeration compartment of the refrigeration equipment; If so, it corresponds to one of the second predetermined conditions.

8. The method according to claim 7, characterized in that The step of determining the jam location of the solenoid valve according to the correspondence between the first temperature difference change curve, the second temperature difference change curve, and the third temperature difference change curve and at least three first predetermined conditions within a refrigeration cycle includes: Detecting whether the first temperature difference change curve is a straight line that stabilizes at a ninth set threshold value within a refrigeration cycle; whether the second temperature difference change curve is a curve that continuously increases until it stabilizes at a third set threshold value; and whether the third temperature difference change curve is a curve that continuously increases until it stabilizes at a tenth set threshold value; wherein the third set threshold value is the difference between the second set threshold value and the first set threshold value; the ninth set threshold value is the difference between the eighth set threshold value and the first set threshold value; and the tenth set threshold value is the difference between the second set threshold value and the eighth set threshold value; If so, it corresponds to one of the first predetermined conditions, and the solenoid valve of the refrigeration device is stuck at the first air outlet.

9. A fault judgment device for a solenoid valve of a refrigeration equipment, characterized in that: The device comprises: an acquisition module, configured to acquire a plurality of first temperature values, a second temperature value, and a third temperature value within a refrigeration cycle; wherein the first temperature value, the second temperature value, and the third temperature value are temperature values ​​of the air inlet of the solenoid valve, the freezer compartment, and the refrigerator compartment, respectively; a first processing module, configured to obtain a plurality of first temperature differences, second temperature differences, and third temperature differences according to a plurality of first temperature values, second temperature values, and third temperature values; wherein the first temperature difference is the difference between the third temperature value and the first temperature value; the second temperature difference is the difference between the second temperature value and the first temperature value; and the third temperature difference is the difference between the third temperature value and the second temperature value; a second processing module, configured to obtain a first temperature difference change curve, a second temperature difference change curve, and a third temperature difference change curve within a refrigeration cycle according to a plurality of the first temperature differences, the second temperature differences, and the third temperature differences; The judgment module is used to judge the jam location of the solenoid valve according to the correspondence between the first temperature difference change curve, the second temperature difference change curve and the third temperature difference change curve and at least three first predetermined conditions in a refrigeration cycle.

10. A refrigeration device, characterized in that: A fault judgment device for a solenoid valve of a refrigeration device comprising the device as claimed in claim 9.

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