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

Abstract

The invention provides a fault detection method and device for an electromagnetic valve of refrigeration equipment and the refrigeration equipment. Through the compressor gear change curve, the freezing fan gear change curve and the refrigeration air door state change curve of the compressor, the freezing fan and the refrigeration air door in one refrigeration cycle respectively, the situation that the electromagnetic valve is blocked can be found in time, the self-detection capacity of the refrigerator is improved, and the invisible maintenance cost for the refrigeration problem is reduced; and the after-sales maintenance efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration equipment, in particular to a fault detection method and device of an electromagnetic valve of a refrigeration equipment and the refrigeration equipment. BACKGROUND

[0002] Currently, the causes of the electromagnetic valve jam in the refrigeration equipment include structural design defects, impurity accumulation mechanism, insufficient material compatibility, etc. Correspondingly, the ways to prevent the electromagnetic valve from jamming include anti-jamming structure optimization, impurity prevention and control technology, intelligent detection and maintenance, etc. These methods mainly prevent and predict the failure of the electromagnetic valve by optimizing the box structure, increasing the filter screen and using the driving current of the detection motor. However, the cost required by the foregoing ways is large, and the electromagnetic valve applied in the refrigeration equipment has a cost limitation, so a simple and fast fault detection method of the electromagnetic valve is needed.

[0003] When the user or the maintenance personnel finds that the refrigeration equipment has a problem, they can only determine that some components of the refrigeration equipment including the electromagnetic valve have a failure through the frost or condensation abnormality of the valve body, the frequent start-stop of the system, the poor or no refrigeration effect, etc. There is no direct failure prompt to determine that a certain position of the electromagnetic valve has a problem, which greatly reduces the after-sales maintenance efficiency. SUMMARY

[0004] In order to at least overcome the above deficiencies in the prior art, the purpose of the present application is to provide a fault detection method of an electromagnetic valve of a refrigeration equipment, the refrigeration equipment comprising a freezing compartment, a refrigerating compartment, an electromagnetic valve and a compressor, and a freezing fan for supplying air to the freezing compartment, a refrigerating damper for supplying cold air to the refrigerating compartment, a first temperature sensor for detecting the temperature of the freezing compartment and a second temperature sensor for detecting the temperature of the refrigerating compartment; wherein the compressor comprises a plurality of compressor speed gears, the freezing fan comprises a plurality of freezing fan speed gears, and the refrigerating damper comprises at least a first state and a second state, in the first state, the refrigerating damper is opened, and in the second state, the refrigerating damper is closed. The electromagnetic valve comprises a first gas outlet and a second gas outlet; the first gas outlet is used for refrigerating the freezing compartment; and the second gas outlet is used for refrigerating the refrigerating compartment. The method comprises: obtaining a plurality of compressor speed gears, a plurality of freezing fan speed gears and a plurality of states of the refrigerating damper in a refrigeration cycle; obtaining a compressor gear change curve, a freezing fan gear change curve and a refrigerating damper state change curve in a refrigeration cycle according to the plurality of compressor speed gears, the plurality of freezing fan speed gears and the plurality of states of the refrigerating damper; determining the jamming position of the electromagnetic valve according to the correspondence between the compressor speed change curve, the freezing fan speed change curve and the freezing door state change curve in one refrigeration cycle and at least three first predetermined conditions.

[0005] In one possible implementation, before the step of acquiring the multiple compressor speed gears, the multiple freezing fan speed gears and the multiple freezing door states in one refrigeration cycle, the method further comprises: acquiring a first temperature value of the freezing chamber detected by the first temperature sensor and a second temperature value of the refrigerating chamber detected by the second temperature sensor; detecting the correspondence between the first temperature value and the second temperature value and at least three second predetermined conditions; if there is the correspondence, performing the step of acquiring the multiple compressor speed gears, the multiple freezing fan speed gears and the multiple freezing door states in one refrigeration cycle.

[0006] In one possible implementation, the step of detecting the correspondence between the first temperature value and the second temperature value and at least three second predetermined conditions comprises: detecting whether the first temperature value is continuously higher than a first set temperature and whether the second temperature value is continuously higher than a second set temperature; wherein the first set temperature is the starting temperature of the freezing chamber; and the second set temperature is the starting temperature of the refrigerating chamber; if yes, there is the correspondence with one of the second predetermined conditions.

[0007] In one possible implementation, the step of determining the jamming position of the electromagnetic valve according to the correspondence between the compressor speed change curve, the freezing fan speed change curve and the freezing door state change curve in one refrigeration cycle and at least three first predetermined conditions comprises: detecting whether the compressor speed change curve in one refrigeration cycle is a curve continuously increasing from a first set gear to a second set gear and then stably at the second set gear, whether the freezing fan speed change curve is a curve continuously increasing from a third set gear to a fourth set gear and then stably at the fourth set gear, and whether the freezing door state change curve is a straight line stably at a first state value corresponding to the first state; wherein the first set gear is a gear corresponding to the compressor speed in normal operation of the refrigeration device; the second set gear is a gear corresponding to the highest compressor speed; the third set gear is a gear corresponding to the lowest freezing fan speed; the fourth set gear is a gear corresponding to the highest freezing fan speed; and the first state value is 1. If yes, one of the first predetermined conditions has a corresponding relationship; the electromagnetic valve of the refrigeration equipment is blocked at the first outlet.

[0008] In a possible implementation, the step of detecting the corresponding relationship between the first temperature value and the second temperature value and the at least three second predetermined conditions comprises: detecting whether the first temperature value is continuously higher than a first set temperature; wherein the first set temperature is the start-up temperature of the freezing compartment; If yes, one of the second predetermined conditions has a corresponding relationship.

[0009] In a possible implementation, the step of determining the blocking position of the electromagnetic valve according to the corresponding relationship between the compressor gear change curve, the freezing fan gear change curve and the refrigeration damper state change curve in one refrigeration cycle and the at least three first predetermined conditions comprises: detecting whether the compressor gear change curve in one refrigeration cycle is a curve continuously increasing from a first set gear to a second set gear, whether the freezing fan gear change curve is a curve continuously increasing from a third set gear to a fourth set gear, and whether the refrigeration damper state change curve is a rectangular wave curve periodically converting between a first state value corresponding to the first state and a second state value corresponding to the second state; wherein the first set gear is a gear corresponding to the compressor rotating speed when the refrigeration equipment is normally running; the second set gear is a gear corresponding to the highest compressor rotating speed; the third set gear is a gear corresponding to the lowest freezing fan rotating speed; the fourth set gear is a gear corresponding to the highest freezing fan rotating speed; the first state value is 1; and the second state value is 0.

[0010] If yes, one of the first predetermined conditions has a corresponding relationship; the electromagnetic valve of the refrigeration equipment is blocked at the first outlet.

[0011] In a possible implementation, the step of detecting the corresponding relationship between the first temperature value and the second temperature value and the at least three second predetermined conditions comprises: detecting whether the second temperature value is continuously higher than a second set temperature; wherein the second set temperature is the start-up temperature of the refrigeration compartment; If yes, one of the second predetermined conditions has a corresponding relationship.

[0012] In a possible implementation, the step of determining the jamming position of the electromagnetic valve according to the correspondence between the compressor speed change curve, the freezing fan speed change curve, the freezing door state change curve in a refrigeration cycle and at least three first predetermined conditions comprises: detecting whether the compressor speed change curve in a refrigeration cycle is a curve continuously increasing from a first set speed to a second set speed, whether the freezing fan speed change curve is a curve continuously increasing from a third set speed to a fourth set speed and then decreasing from the fourth set speed, and whether the freezing door state change curve is a straight line stably at a first state value corresponding to the first state; wherein the first set speed is a speed corresponding to a speed of the compressor in normal operation of the refrigeration device; the second set speed is a speed corresponding to a highest speed of the compressor; the third set speed is a speed corresponding to a lowest speed of the freezing fan; the fourth set speed is a speed corresponding to a highest speed of the freezing fan; and the first state value is 1. If yes, the first predetermined condition has a correspondence; and the electromagnetic valve of the refrigeration device is jammed at the second outlet.

[0013] The application further provides a fault detection device of an electromagnetic valve of a refrigeration device, which comprises: a obtaining module configured to obtain a plurality of compressor speeds, a plurality of freezing fan speeds and a plurality of freezing door states in a refrigeration cycle; a processing module configured to obtain a compressor speed change curve, a freezing fan speed change curve and a freezing door state change curve in a refrigeration cycle according to the plurality of compressor speeds, the plurality of freezing fan speeds and the plurality of freezing door states; a determining module configured to determine a jamming position of the electromagnetic valve according to the correspondence between the compressor speed change curve, the freezing fan speed change curve, the freezing door state change curve in a refrigeration cycle and at least three first predetermined conditions.

[0014] The application further provides a refrigeration device comprising the fault detection device of the electromagnetic valve of the refrigeration device.

[0015] Compared with the prior art, the application has the following beneficial effects: The application provides a fault detection method and device of an electromagnetic valve of a refrigeration equipment and the refrigeration equipment, and the compressor, the freezing fan and the refrigeration door are used to draw the compressor gear change curve, the freezing fan gear change curve and the refrigeration door state change curve in a refrigeration cycle, so that the jamming of the electromagnetic valve can be found in time, the self-detection capability of the refrigerator is improved, the hidden maintenance cost of the refrigeration problem is reduced, and the after-sales maintenance efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings required to be invoked in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of the drawings.

[0017] Figure 1 One of the flowcharts of the fault detection method of the electromagnetic valve of the refrigeration equipment provided by the embodiment; Figure 2 The second flowchart of the fault detection method of the electromagnetic valve of the refrigeration equipment provided by the embodiment; Figure 3 The structural schematic diagram of the fault detection device of the electromagnetic valve of the refrigeration equipment provided by the embodiment. DETAILED DESCRIPTION

[0018] In order to make the objects, technical solutions and advantages of the embodiments of the application clearer, the technical solutions in the embodiments of the application will be described clearly and completely in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, but not all the embodiments. The components of the embodiments of the application described and shown in the drawings can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. All other embodiments obtained by those skilled in the art on the basis of the embodiments in the application without creative labor are within the scope of protection of the application.

[0020] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0021] In the description of the present application, it should be noted that the terms "upper", "lower" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0022] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0023] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "provided", "mounted", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] It should be noted that the different features in the embodiments of the present application can be combined with each other without conflict.

[0025] The inventor found that when the user or the maintenance personnel finds that the refrigeration equipment has a problem, he can only determine that some components of the refrigeration equipment including the electromagnetic valve have a fault through the frost or condensation abnormality of the valve body, the frequent start and stop of the system, the poor refrigeration effect or no refrigeration, etc. There is no direct fault prompt to determine that there is a problem in a certain position of the electromagnetic valve, which greatly reduces the after-sales maintenance efficiency.

[0026] Therefore, the present application provides a fault detection method for an electromagnetic valve of a refrigeration equipment, the refrigeration equipment comprising a freezing compartment, a refrigerating compartment, an electromagnetic valve and a compressor, and a freezing fan for supplying air to the freezing compartment, a refrigerating air door for supplying cold air to the refrigerating compartment, a first temperature sensor for detecting the temperature of the freezing compartment and a second temperature sensor for detecting the temperature of the refrigerating compartment; wherein the compressor comprises a plurality of compressor speed gears, the freezing fan comprises a plurality of freezing fan speed gears, the refrigerating air door comprises at least a first state and a second state, in the first state, the refrigerating air door is opened; in the second state, the refrigerating air door is closed.

[0027] Optionally, in the embodiment, the first temperature sensor and the second temperature sensor can comprise thermistor sensors.

[0028] Optionally, in the embodiment, the compressor can be divided into 12 compressor speed gears according to different rotating speeds, and the freezing fan can be divided into 8 freezing fan speed gears according to different rotating speeds.

[0029] In the refrigeration equipment, the compressor is used to drive the circulation of refrigerant to provide a cold source for the storage room of the refrigeration equipment; the freezing fan is used to forcibly send air to the freezing room to maintain a low temperature in the freezing room; and the refrigeration door is used to adjust the cold air flow to control the temperature of the refrigeration room.

[0030] The electromagnetic valve comprises a first gas outlet and a second gas outlet; the first gas outlet is used to refrigerate the freezing room; and the second gas outlet is used to refrigerate the refrigeration room.

[0031] The method comprises the following steps.

[0032] In step S11, a plurality of compressor speed gears, a plurality of freezing fan speed gears and a plurality of refrigeration door states in one refrigeration cycle are obtained.

[0033] In this step, one refrigeration cycle refers to the time required for the complete working process of the refrigeration effect, in which the heat is transferred from the refrigeration equipment to the outside air through the circulation of refrigerant in the refrigeration equipment, and each storage room reaches the set temperature.

[0034] In step S12, a compressor gear change curve, a freezing fan gear change curve and a refrigeration door state change curve in one refrigeration cycle are obtained according to the plurality of compressor speed gears, the plurality of freezing fan speed gears and the plurality of refrigeration door states.

[0035] During the operation of the refrigeration equipment, if the first gas outlet and / or the second gas outlet of the electromagnetic valve fails, the states of the compressor speed, the freezing fan speed and the refrigeration door will change accordingly, and the compressor gear change curve, the freezing fan gear change curve and the refrigeration door state change curve will have different trends, and through these trends, the fault problem of the gas outlet of the electromagnetic valve can be determined in time.

[0036] In step S13, the jammed part of the electromagnetic valve is determined according to the corresponding relationship between the compressor gear change curve, the freezing fan gear change curve and the refrigeration door state change curve in one refrigeration cycle and at least three first predetermined conditions.

[0037] In this step, since the refrigeration equipment in the application at least includes a freezing compartment and a refrigerating compartment, if the first outlet and / or the second outlet of the electromagnetic valve fails, the following three failure conditions may occur: the first outlet fails, the second outlet fails, and both the first outlet and the second outlet fail. If each failure condition corresponds to only one first predetermined condition, then the first predetermined condition has at least three.

[0038] In this embodiment, since the rotation speed of the freezing fan is automatically adjusted according to the temperature of the first temperature sensor, the state of the refrigerating damper is automatically adjusted according to the temperature of the second temperature sensor, and the rotation speed of the compressor is automatically adjusted according to the temperatures of the first temperature sensor and the second temperature sensor; therefore, it can be found in time where the electromagnetic valve is stuck by the compressor, freezing fan and refrigerating damper respectively in the compressor gear change curve, freezing fan gear change curve and refrigerating damper state change curve in a refrigeration cycle, improving the self-detection ability of the refrigerator, and further improving the after-sales maintenance efficiency.

[0039] In a possible implementation, in order to reduce energy consumption, please refer to Figure 2 Before step S11 is executed, the method further includes the following steps.

[0040] Step S21, obtaining the first temperature value of the freezing compartment detected by the first temperature sensor and the second temperature value of the refrigerating compartment detected by the second temperature sensor.

[0041] In this embodiment, if the electromagnetic valve of the refrigeration equipment fails, it will inevitably change the temperature of the refrigerating compartment and the freezing compartment in the refrigeration equipment, so before confirming where the electromagnetic valve of the refrigeration equipment fails, the first temperature value and the second temperature value can be obtained by real-time temperature monitoring of the refrigerating compartment and the freezing compartment in the refrigeration equipment, and if abnormal temperature change occurs, the subsequent steps are executed.

[0042] Step S22, detecting the correspondence between the first temperature value and the second temperature value and at least three second predetermined conditions.

[0043] In this step, since the first temperature value and the second temperature value change differently due to the failure of different parts of the refrigeration equipment, the first temperature value and the second temperature value can be preliminarily judged by the correspondence between the first temperature value and the second temperature value and the second predetermined condition.

[0044] If there is a correspondence, the step of obtaining a plurality of compressor rotation speed gears, a plurality of freezing fan rotation speed gears and a plurality of refrigerating damper states in a refrigeration cycle is executed.

[0045] If there is no corresponding relationship, it is necessary to find other fault parts of the refrigeration equipment through other ways.

[0046] In a possible implementation, the step of detecting the correspondence between the first temperature value, the second temperature value and the at least three second predetermined conditions comprises the following sub-steps.

[0047] Detecting whether the first temperature value is continuously higher than a first set temperature and whether the second temperature value is continuously higher than a second set temperature; wherein the first set temperature is a start-up temperature of the freezing compartment; and the second set temperature is a start-up temperature of the refrigerating compartment.

[0048] If yes, there is a corresponding relationship with one of the second predetermined conditions.

[0049] In a possible implementation, the step of determining the jammed part of the electromagnetic valve according to the correspondence between the compressor gear change curve, the freezing fan gear change curve and the refrigerating damper state change curve in one refrigeration cycle and the at least three first predetermined conditions comprises the following sub-steps.

[0050] Detecting whether the compressor gear change curve in one refrigeration cycle is a curve continuously increasing from a first set gear to a second set gear and then stably at the second set gear, whether the freezing fan gear change curve is a curve continuously increasing from a third set gear to a fourth set gear and then stably at the fourth set gear, and whether the refrigerating damper state change curve is a straight line stably at a first state value corresponding to the first state; wherein the first set gear is a gear corresponding to a compressor rotating speed in normal operation of the refrigeration equipment; the second set gear is a gear corresponding to the highest compressor rotating speed; the third set gear is a gear corresponding to the lowest freezing fan rotating speed; the fourth set gear is a gear corresponding to the highest freezing fan rotating speed; and the first state value is 1.

[0051] If yes, there is a corresponding relationship with one of the first predetermined conditions; and the electromagnetic valve of the refrigeration equipment is jammed at both the first air outlet and the second air outlet.

[0052] In the embodiment, when the first outlet and the second outlet of the electromagnetic valve are both blocked during the operation of the refrigeration device, the temperature of the refrigeration chamber and the freezing chamber will be increased to above the starting temperature of the refrigeration chamber and the freezing chamber respectively and last for a period of time; the compressor gear change curve is a curve that continuously increases from the gear corresponding to the compressor speed during the normal operation of the refrigeration device to the gear corresponding to the highest compressor speed, the freezing fan gear change curve is a curve that continuously increases from the gear corresponding to the lowest freezing fan speed to the gear corresponding to the highest freezing fan speed, and the refrigeration damper state change curve is a straight line that is stable at the first state value corresponding to the first state, that is, the refrigeration damper is long-term opened.

[0053] Exemplarily, during the operation of the refrigeration device, if the refrigeration device is a stable refrigeration cycle of 360 minutes, the first set gear is set to 3, the second set gear is set to 8, the third set gear is set to 1, and the fourth set gear is set to 12; the first set temperature is -17℃; and the second set temperature is 5.5℃.

[0054] The refrigeration device obtains the first temperature value and the second temperature value as -10℃ and 10℃ respectively, and the room temperature is 25℃.

[0055] At 0 time, the compressor speed gear is 3, the freezing fan speed gear is 1, and the refrigeration damper is in the first state.

[0056] … At the 60th minute, the compressor speed gear is 4, the freezing fan speed gear is 2, and the refrigeration damper is in the first state.

[0057] … At the 120th minute, the compressor speed gear is 5, the freezing fan speed gear is 4, and the refrigeration damper is in the first state.

[0058] … At the 180th minute, the compressor speed gear is 6, the freezing fan speed gear is 6, and the refrigeration damper is in the first state.

[0059] … At the 240th minute, the compressor speed gear is 7, the freezing fan speed gear is 8, and the refrigeration damper is in the first state.

[0060] … At the 300th minute, the compressor speed gear is 8, the freezing fan speed gear is 10, and the refrigeration damper is in the first state.

[0061] … At the 360th minute, the compressor speed gear is 8, the freezing fan speed gear is 12, and the refrigeration damper is in the first state.

[0062] According to the temperature recorded in real time, the compressor gear change curve in one refrigeration cycle is a curve continuously rising from 3 to 8, the freeze fan gear change curve is a curve continuously rising from 1 to 12, and the refrigeration damper state change curve is a straight line stably at the first state value corresponding to the first state, i.e. 1.

[0063] Therefore, it can be judged that the electromagnetic valve of the refrigeration equipment is stuck at both the first outlet and the second outlet.

[0064] It should be noted that in the embodiment, the fan and the compressor do not stop in one refrigeration cycle.

[0065] In a possible implementation, the step of detecting the correspondence between the first temperature value, the second temperature value and at least three second predetermined conditions comprises the following sub-steps.

[0066] Detecting whether the first temperature value is continuously higher than a first set temperature; wherein the first set temperature is the start-up temperature of the freezing compartment.

[0067] If yes, it has a correspondence with one of the second predetermined conditions.

[0068] In a possible implementation, the step of determining the stuck position of the electromagnetic valve according to the correspondence between the compressor gear change curve, the freeze fan gear change curve and the refrigeration damper state change curve in one refrigeration cycle and at least three first predetermined conditions comprises the following sub-steps.

[0069] Detecting whether the compressor gear change curve in one refrigeration cycle is a curve continuously rising from a first set gear to a second set gear, whether the freeze fan gear change curve is a curve continuously rising from a third set gear to a fourth set gear, and whether the refrigeration damper state change curve is a rectangular wave curve periodically converting between a first state value corresponding to the first state and a second state value corresponding to the second state; wherein the first set gear is a gear corresponding to the compressor speed when the refrigeration equipment is normally running; the second set gear is a gear corresponding to the highest compressor speed; the third set gear is a gear corresponding to the lowest freeze fan speed; the fourth set gear is a gear corresponding to the highest freeze fan speed; the first state value is 1; and the second state value is 0.

[0070] If yes, it has a correspondence with one of the first predetermined conditions; and the electromagnetic valve of the refrigeration equipment is stuck at the first outlet.

[0071] In the embodiment, if the first outlet of the electromagnetic valve is blocked when the refrigeration device is running, the refrigeration effect of the freezing chamber will be affected. At this time, the temperature of the freezing chamber will rise to be continuously greater than the start-up temperature of the freezing compartment. The compressor gear change curve is a curve that continuously rises from the gear corresponding to the compressor speed when the refrigeration device is running normally to the gear corresponding to the highest compressor speed, the freezing fan gear change curve is a curve that continuously rises from the gear corresponding to the lowest freezing fan speed to the gear corresponding to the highest freezing fan speed, and the change curve of the state of the refrigeration damper is a rectangular wave curve that periodically changes between the first state value corresponding to the first state and the second state value corresponding to the second state, that is, the refrigeration damper is periodically opened and closed according to the temperature of the refrigeration compartment.

[0072] It should be noted that in the embodiment, the fan and the compressor do not stop during one refrigeration cycle.

[0073] In a possible implementation, the step of detecting the correspondence between the first temperature value, the second temperature value, and at least three second predetermined conditions includes the following sub-steps.

[0074] Detecting whether the second temperature value is continuously higher than a second set temperature; wherein the second set temperature is the start-up temperature of the refrigeration compartment.

[0075] If yes, it has a corresponding relationship with one of the second predetermined conditions.

[0076] In a possible implementation, the step of determining the blocked part of the electromagnetic valve according to the correspondence between the compressor gear change curve, the freezing fan gear change curve, and the change curve of the state of the refrigeration damper during one refrigeration cycle and at least three first predetermined conditions includes the following sub-steps.

[0077] Detecting whether the compressor gear change curve is a curve that continuously rises from a first set gear to a second set gear during one refrigeration cycle, whether the freezing fan gear change curve is a curve that continuously rises from a third set gear to a fourth set gear and then fluctuates with the fourth set gear as the upper limit, and whether the change curve of the state of the refrigeration damper is a straight line that is stable at the first state value corresponding to the first state; wherein the first set gear is the gear corresponding to the compressor speed when the refrigeration device is running normally; the second set gear is the gear corresponding to the highest compressor speed; the third set gear is the gear corresponding to the lowest freezing fan speed; the fourth set gear is the gear corresponding to the highest freezing fan speed; and the first state value is 1.

[0078] If yes, the second outlet of the electromagnetic valve of the refrigeration equipment is blocked.

[0079] In the embodiment, if the second outlet of the electromagnetic valve is blocked when the refrigeration equipment is running, the refrigeration effect of the refrigeration chamber will be affected. At this time, the temperature of the refrigeration chamber will be continuously higher than the start temperature of the refrigeration chamber. The compressor gear change curve is continuously raised from the gear corresponding to the compressor speed during normal operation of the refrigeration equipment until the gear corresponding to the highest compressor speed, the freezing fan gear change curve is continuously raised from the gear corresponding to the lowest freezing fan speed until the gear corresponding to the highest freezing fan speed, and then the refrigeration damper state change curve is a straight line stably at the first state value corresponding to the first state, that is, the refrigeration damper is long-term opened.

[0080] It should be noted that in the embodiment, the fan and the compressor are not stopped during a refrigeration cycle.

[0081] Based on the same inventive concept, the application also provides a fault detection device for an electromagnetic valve of a refrigeration equipment, please refer to Figure 3 , comprising a plurality of function modules which can be stored in a machine-readable storage medium in software form. From the functional point of view, the fault detection device for the electromagnetic valve of the refrigeration equipment can include an acquisition module, a processing module and a determination module.

[0082] The acquisition module is configured to acquire a plurality of compressor speed gears, a plurality of freezing fan speed gears and a plurality of refrigeration damper states in a refrigeration cycle.

[0083] In the embodiment, the acquisition module can be configured to perform Figure 1 step S11 shown in the figure, and the specific description of the acquisition module can refer to the description of step S11.

[0084] The processing module is configured to obtain a compressor gear change curve, a freezing fan gear change curve and a refrigeration damper state change curve in a refrigeration cycle according to the plurality of compressor speed gears, the plurality of freezing fan speed gears and the plurality of refrigeration damper states.

[0085] In the embodiment, the processing module can be configured to perform Figure 1 step S12 shown in the figure, and the specific description of the processing module can refer to the description of step S12.

[0086] The determination module is configured to determine the blocked position of the electromagnetic valve according to the correspondence between the compressor gear change curve, the freezing fan gear change curve and the refrigeration damper state change curve in a refrigeration cycle and at least three first predetermined conditions.

[0087] In the embodiment, the determining module can be configured to perform Figure 1 The step S13 is shown, and the specific description of the determining module can refer to the description of the step S13.

[0088] Based on the same inventive concept, the application further provides a fault detection device of an electromagnetic valve of a refrigeration equipment.

[0089] In a possible implementation, the refrigeration equipment further comprises a control module and a display screen, the control module is electrically connected with the fault detection device of the electromagnetic valve of the refrigeration equipment, and is configured to receive a first electric signal of the fault detection device of the electromagnetic valve of the refrigeration equipment, the first electric signal comprises a final determination of a jammed part of the electromagnetic valve by the fault detection device of the electromagnetic valve of the refrigeration equipment; the control module is electrically connected with the display screen, and is configured to send a second electric signal to the display screen, so that the display screen displays the jammed condition of the electromagnetic valve. For example, when the first gas outlet and the second gas outlet are simultaneously jammed, the display panel prompts “E1”; when the first gas outlet is jammed, the display panel prompts “E2”; and when the second gas outlet is jammed, the display panel prompts “E3”. In this way, when a maintenance personnel maintains the refrigeration equipment with a fault electromagnetic valve, the visual display of the fault code of the jammed electromagnetic valve saves the invalid communication time cost of the user and the after-sales, and improves the maintenance efficiency.

[0090] The application provides a fault detection method and device of an electromagnetic valve of a refrigeration equipment and the refrigeration equipment, which can timely find where the electromagnetic valve is jammed through the compressor gear change curve, the freezing fan gear change curve and the refrigeration damper state change curve of the compressor, the freezing fan and the refrigeration damper in a refrigeration cycle, improves the self-detection capability of the refrigerator, reduces the hidden maintenance cost of the refrigeration problem, and improves the after-sales maintenance efficiency.

[0091] It should be noted that, in this document, the terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms “include”, “contain” or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement “including a” does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0092] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A failure detection method of a solenoid valve of a refrigeration apparatus, characterized by, The refrigeration equipment comprises a freezing compartment, a refrigeration compartment, a solenoid valve and a compressor, and a freezing fan for supplying air to the freezing compartment, a refrigeration air door for supplying cold air to the refrigeration compartment, a first temperature sensor for detecting the temperature of the freezing compartment and a second temperature sensor for detecting the temperature of the refrigeration compartment; wherein the compressor comprises a plurality of compressor speed gears, the freezing fan comprises a plurality of freezing fan speed gears, and the refrigeration air door comprises at least a first state and a second state, in the first state, the refrigeration air door is opened, and in the second state, the refrigeration air door is closed; The solenoid valve comprises a first gas outlet and a second gas outlet; the first gas outlet is used for refrigerating the freezing compartment; and the second gas outlet is used for refrigerating the refrigeration compartment; The method comprises: obtaining a plurality of compressor speed gears, a plurality of freezing fan speed gears and a plurality of states of the refrigeration air door in a refrigeration cycle; obtaining a compressor gear change curve, a freezing fan gear change curve and a refrigeration air door state change curve in a refrigeration cycle according to the plurality of compressor speed gears, the plurality of freezing fan speed gears and the plurality of states of the refrigeration air door; determining the jamming position of the solenoid valve according to the correspondence between the compressor gear change curve, the freezing fan gear change curve and the refrigeration air door state change curve in a refrigeration cycle and at least three first predetermined conditions.

2. The method of claim 1, wherein, Before the step of obtaining a plurality of compressor speed gears, a plurality of freezing fan speed gears and a plurality of states of the refrigeration air door in a refrigeration cycle, the method further comprises: obtaining a first temperature value of the freezing compartment detected by the first temperature sensor and a second temperature value of the refrigeration compartment detected by the second temperature sensor; detecting the correspondence between the first temperature value and the second temperature value and at least three second predetermined conditions; if there is a correspondence, then performing the step of obtaining a plurality of compressor speed gears, a plurality of freezing fan speed gears and a plurality of states of the refrigeration air door in a refrigeration cycle.

3. The method of claim 2, wherein, The step of detecting the correspondence between the first temperature value and the second temperature value and at least three second predetermined conditions comprises: detecting whether the first temperature value is continuously higher than a first set temperature and whether the second temperature value is continuously higher than a second set temperature; wherein the first set temperature is the starting temperature of the freezing compartment, and the second set temperature is the starting temperature of the refrigeration compartment; if yes, then having a correspondence with one of the second predetermined conditions.

4. The method of claim 3, wherein, The step of determining the jamming position of the solenoid valve according to the correspondence between the compressor gear change curve, the freezing fan gear change curve and the refrigeration air door state change curve in a refrigeration cycle and at least three first predetermined conditions comprises: detecting whether the compressor gear change curve in a refrigeration cycle is a curve continuously increasing from a first set gear to a second set gear, whether the freezing fan gear change curve is a curve continuously increasing from a third set gear to a fourth set gear, and whether the freezing door state change curve is a straight line stably at a first state value corresponding to the first state; wherein the first set gear is a gear corresponding to a compressor speed in normal operation of the refrigeration equipment; the second set gear is a gear corresponding to a highest compressor speed; the third set gear is a gear corresponding to a lowest freezing fan speed; the fourth set gear is a gear corresponding to a highest freezing fan speed; and the first state value is 1; if yes, having a corresponding relationship with one of the first predetermined conditions; and the electromagnetic valve of the refrigeration equipment is stuck at the first outlet.

5. The method of claim 2, wherein, The step of detecting the corresponding relationship between the first temperature value and the second temperature value and at least three second predetermined conditions comprises: detecting whether the first temperature value is continuously higher than a first set temperature; wherein the first set temperature is a start-up temperature of the freezing compartment; if yes, having a corresponding relationship with one of the second predetermined conditions.

6. The method of claim 5, wherein, The step of determining the stuck position of the electromagnetic valve according to the corresponding relationship between the compressor gear change curve, the freezing fan gear change curve and the freezing door state change curve in a refrigeration cycle and at least three first predetermined conditions comprises: detecting whether the compressor gear change curve in a refrigeration cycle is a curve continuously increasing from a first set gear to a second set gear, whether the freezing fan gear change curve is a curve continuously increasing from a third set gear to a fourth set gear, and whether the freezing door state change curve is a rectangular wave curve periodically converting between a first state value corresponding to the first state and a second state value corresponding to the second state; wherein the first set gear is a gear corresponding to a compressor speed in normal operation of the refrigeration equipment; the second set gear is a gear corresponding to a highest compressor speed; the third set gear is a gear corresponding to a lowest freezing fan speed; the fourth set gear is a gear corresponding to a highest freezing fan speed; the first state value is 1; and the second state value is 0. if yes, having a corresponding relationship with one of the first predetermined conditions; and the electromagnetic valve of the refrigeration equipment is stuck at the first outlet.

7. The method of claim 2, wherein, The step of detecting the corresponding relationship between the first temperature value and the second temperature value and at least three second predetermined conditions comprises: detecting whether the second temperature value is continuously higher than a second set temperature; wherein the second set temperature is a start-up temperature of the freezing compartment; if yes, having a corresponding relationship with one of the second predetermined conditions.

8. The method of claim 7, wherein, The step of determining the jamming position of the electromagnetic valve according to the correspondence between the compressor speed change curve, the freezing fan speed change curve and the freezing damper state change curve in a refrigeration cycle and at least three first predetermined conditions comprises: detecting whether the compressor speed change curve in a refrigeration cycle is a curve continuously increasing from a first set speed to a second set speed, whether the freezing fan speed change curve is a curve continuously increasing from a third set speed to a fourth set speed and then decreasing from the fourth set speed, and whether the freezing damper state change curve is a straight line stably at a first state value corresponding to the first state; wherein the first set speed is a speed corresponding to a speed of the compressor in normal operation of the refrigeration equipment; the second set speed is a speed corresponding to a highest speed of the compressor; the third set speed is a speed corresponding to a lowest speed of the freezing fan; the fourth set speed is a speed corresponding to a highest speed of the freezing fan; and the first state value is 1; if yes, the first predetermined condition has a correspondence; and the electromagnetic valve of the refrigeration equipment is jammed at the second outlet.

9. A failure detection device of a solenoid valve of a refrigerating apparatus, characterized by comprising: The device comprises: an acquisition module configured to acquire a plurality of compressor speed gears, a plurality of freezing fan speed gears and a plurality of freezing damper states in a refrigeration cycle; a processing module configured to obtain a compressor speed change curve, a freezing fan speed change curve and a freezing damper state change curve in a refrigeration cycle according to the plurality of compressor speed gears, the plurality of freezing fan speed gears and the plurality of freezing damper states; a determination module configured to determine a jamming position of the electromagnetic valve according to the correspondence between the compressor speed change curve, the freezing fan speed change curve and the freezing damper state change curve in a refrigeration cycle and at least three first predetermined conditions.

10. A refrigeration appliance characterized in that, The device for detecting a fault of an electromagnetic valve of a refrigeration equipment comprises the refrigeration equipment. The device for detecting a fault of an electromagnetic valve of a refrigeration equipment comprises the refrigeration equipment.

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