Method and device for detecting clogging of a stop check valve in a refrigerated extractor hood

Abstract

The present disclosure provides a kind of blocking detection method and device for stopping reverse valve of refrigeration range hood, wherein the refrigeration range hood includes inner machine fan, condenser and reverse valve, in response to the high pressure protection signal generated by refrigeration range hood, the rotating speed of inner machine fan is controlled to reduce, after a period of time, the temperature of the surface of condenser is acquired, whether the reverse valve is blocked is judged according to the temperature of the surface of condenser, by monitoring and analyzing the temperature of the surface of condenser, whether it is caused by the blocking of reverse valve can be quickly judged when high pressure protection alarm appears in refrigeration range hood, the fault reason can be quickly investigated without disassembling range hood, the fault detection efficiency of refrigeration range hood is improved, unnecessary maintenance cost is avoided.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of range hood, and in particular to a method and device for detecting blockage of check valve in refrigeration range hood. BACKGROUND

[0002] Nowadays, the kitchen space is usually small. When cooking in the kitchen, a large amount of heat will be generated, especially in summer. The high temperature will bring serious discomfort to the cook. Although installing an air conditioner in the kitchen can effectively alleviate this problem, for a general family, it is not economical to install an air conditioner alone because of the low utilization rate of the kitchen. Moreover, the kitchen space is limited, and installing an air conditioner alone will occupy valuable kitchen space and is not economical. Therefore, in order to improve the working environment of the cook in the kitchen and save kitchen space, the refrigeration range hood has emerged as the times require.

[0003] The refrigeration range hood is usually equipped with a high-pressure protection system. When the pressure of the refrigeration range hood is too high, it will stop to avoid potential safety risks. However, due to the large fluctuation of kitchen fume, temperature and humidity, fault diagnosis becomes more complex. When the refrigeration range hood appears high-pressure protection alarm, it is not possible to determine whether it is caused by the simple fault of check valve blockage in time. It is necessary to wait for professional maintenance personnel to come to the door for fault diagnosis, which leads to low fault detection efficiency and affects the user's experience to some extent. SUMMARY

[0004] The technical problem to be solved by the present disclosure is to overcome the defect that the refrigeration range hood in the prior art cannot quickly diagnose whether the high-pressure protection alarm of the refrigeration range hood is caused by the blockage of the check valve. A method and device for detecting blockage of check valve in refrigeration range hood are provided.

[0005] The present disclosure solves the above technical problems by the following technical solutions:

[0006] The present disclosure provides a method for detecting blockage of check valve in refrigeration range hood. The refrigeration range hood includes an indoor fan, a condenser and a check valve. The detection method comprises:

[0007] In response to a high-pressure protection signal generated by the refrigeration range hood, the speed of the indoor fan is reduced. After a period of time, the temperature of the surface of the condenser is obtained. Whether the check valve is blocked is determined according to the temperature.

[0008] Optionally, the step of determining whether the check valve is blocked according to the temperature comprises:

[0009] In response to the temperature not exceeding a first threshold value, it is determined that the check valve is not blocked.

[0010] In response to the temperature exceeding the first threshold, determining whether the check valve is blocked according to the ambient temperature inside the refrigeration range hood.

[0011] Optionally, the refrigeration range hood further comprises a compressor, and in response to the temperature exceeding the first threshold, the step of determining whether the check valve is blocked according to the ambient temperature inside the refrigeration range hood specifically comprises:

[0012] In response to the temperature exceeding the first threshold, controlling the compressor to be turned off;

[0013] After a period of time, obtaining a first ambient temperature inside the refrigeration range hood;

[0014] Controlling the compressor to be turned on;

[0015] After a period of time, obtaining a second ambient temperature inside the refrigeration range hood;

[0016] Determining whether the check valve is blocked according to the first ambient temperature and the second ambient temperature.

[0017] Optionally, the step of determining whether the check valve is blocked according to the first ambient temperature and the second ambient temperature specifically comprises:

[0018] In response to the difference between the first ambient temperature and the second ambient temperature exceeding a second threshold, determining that the check valve is blocked.

[0019] Optionally, the refrigeration range hood further comprises a heat dissipation fan, and the step of controlling the rotation speed of the indoor fan to be reduced comprises: controlling the rotation speed of the heat dissipation fan to be increased.

[0020] Optionally, the detection method further comprises: in response to the temperature of the surface of the condenser exceeding a preset threshold, generating a high-voltage protection signal.

[0021] The present disclosure also provides a device for detecting blockage of a check valve in a refrigeration range hood, the refrigeration range hood comprising an indoor fan, a condenser, and a check valve, the detection device comprising a control module, an acquisition module, and a determination module;

[0022] The control module is configured to, in response to a high-voltage protection signal generated by the refrigeration range hood, control the rotation speed of the indoor fan to be reduced, and to call the acquisition module after a period of time;

[0023] The acquisition module is configured to acquire the temperature of the surface of the condenser.

[0024] The determination module is configured to determine whether the check valve is blocked according to the temperature.

[0025] Optionally, the determination module is specifically configured to:

[0026] in response to the temperature not exceeding the first threshold value, determining that the check valve is not blocked;

[0027] in response to the temperature exceeding the first threshold value, determining whether the check valve is blocked according to an ambient temperature inside the refrigeration range hood.

[0028] Optionally, the refrigeration range hood further comprises a compressor, and the determining module is specifically configured to:

[0029] in response to the temperature exceeding the first threshold value, controlling the compressor to be turned off;

[0030] after a period of time, obtaining a first ambient temperature inside the refrigeration range hood;

[0031] controlling the compressor to be turned on;

[0032] after a period of time, obtaining a second ambient temperature inside the refrigeration range hood;

[0033] determining whether the check valve is blocked according to the first ambient temperature and the second ambient temperature.

[0034] Optionally, the determining module is specifically configured to determine that the check valve is blocked in response to a difference between the first ambient temperature and the second ambient temperature exceeding a second threshold value.

[0035] Optionally, the control module is further configured to control the speed of the heat dissipation fan to be increased before controlling the speed of the inner machine fan to be reduced.

[0036] Optionally, the detection device further comprises a high-voltage protection signal generation module, which is specifically configured to generate a high-voltage protection signal in response to the temperature of the surface of the condenser exceeding a preset threshold value.

[0037] The present disclosure further provides a refrigeration range hood, comprising a memory, a processor, and a computer program stored in the memory and used for running on the processor, wherein the processor implements the method for detecting blockage of a check valve in the refrigeration range hood of the present disclosure when executing the computer program.

[0038] The present disclosure further provides a computer-readable storage medium, which stores a computer program, wherein the computer program is executed by a processor to implement the method for detecting blockage of a check valve in a refrigeration range hood of the present disclosure.

[0039] The present disclosure further provides a computer program product, which comprises a computer program, wherein the computer program is executed by a processor to implement the steps of the method for detecting blockage of a check valve in a refrigeration range hood of the present disclosure.

[0040] On the basis of common knowledge in the art, the optional conditions above can be combined arbitrarily, i.e. to obtain each preferred example of the present disclosure.

[0041] The positive progress effect of the present disclosure is that, in response to the high-pressure protection signal generated by the refrigeration range hood, the rotating speed of the indoor fan is controlled to be reduced, and after a period of time, the temperature of the surface of the condenser is obtained, and whether the check valve is blocked is determined according to the temperature of the surface of the condenser. Through monitoring and analyzing the temperature of the surface of the condenser, when the high-pressure protection alarm of the refrigeration range hood occurs, it can be quickly judged whether it is caused by the blockage of the check valve. Without disassembling the range hood, the fault cause can be quickly investigated, the fault detection efficiency of the refrigeration range hood is improved, and unnecessary maintenance cost is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 A flowchart of a method for detecting blockage of a check valve in a refrigeration range hood is provided for Embodiment 1 of the present disclosure;

[0043] Figure 2 A flowchart for determining whether the check valve is blocked according to the temperature of the surface of the condenser is provided for Embodiment 1 of the present disclosure;

[0044] Figure 3 A flowchart for determining whether the check valve is blocked according to the ambient temperature inside the refrigeration range hood is provided for Embodiment 1 of the present disclosure;

[0045] Figure 4 An internal structure diagram of a refrigeration range hood is provided for Embodiment 1 of the present disclosure;

[0046] Figure 5 A working flowchart of a refrigeration range hood is provided for Embodiment 1 of the present disclosure;

[0047] Figure 6 A structure block diagram of a check valve blockage detection device in a refrigeration range hood is provided for Embodiment 2 of the present disclosure;

[0048] Figure 7 A structure diagram of a refrigeration range hood is provided for Embodiment 3 of the present disclosure. DETAILED DESCRIPTION

[0049] The present disclosure will be further illustrated by way of examples below, but the present disclosure is not limited in the scope of the examples.

[0050] The prefix words such as "first", "second" in the embodiments of the present disclosure are only used to distinguish different description objects, and do not have limiting effect on the position, order, priority, quantity or content of the described objects. The use of prefix words such as ordinal numbers in the embodiments of the present disclosure does not constitute limitation on the described objects, and the description of the described objects should be referred to the description in the context of claims or embodiments, and should not constitute redundant limitation because of the use of such prefix words. In addition, in the description of the embodiments, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0051] In the embodiments of the present disclosure, the collection, storage, use, processing, transmission, provision and disclosure of user personal information involved are in accordance with the provisions of relevant laws and regulations, and do not violate public order and good customs.

[0052] Embodiment 1

[0053] Figure 1 A flowchart of a method for detecting blockage of a check valve in a refrigeration range hood is provided for an exemplary embodiment of the present disclosure. The refrigeration range hood includes an indoor fan, a condenser, and a check valve.

[0054] In the refrigeration range hood, the surface temperature of the condenser is a key indicator of the normal operation of the refrigeration range hood. If the surface temperature of the condenser is within the normal range, it indicates that the refrigeration range hood is operating normally. If the surface temperature of the condenser is abnormally high, it indicates that the condenser has a heat dissipation failure. High external environment temperature, condenser fan failure, condenser surface dirt, or check valve blockage may all cause the condenser to have a heat dissipation failure.

[0055] In the refrigeration range hood, the check valve is usually installed at the inlet of the condenser and is mainly used to ensure that the refrigerant does not flow back from the condenser to the compressor, thereby avoiding damage to the compressor. Under normal circumstances, the refrigerant is output from the compressor and enters the condenser through the check valve. At this time, the valve flap is opened and the refrigerant flows smoothly. If the refrigerant flows in the opposite direction, the valve flap will quickly close, thereby preventing backflow. If the check valve is blocked due to impurities, deposits, or other reasons, it will hinder the flow of refrigerant, and the refrigerant in the condenser cannot flow smoothly back to the evaporator, resulting in an accumulation of refrigerant in the condenser, which causes the pressure of the refrigeration range hood to rise sharply, thereby triggering a high-pressure protection signal of the refrigeration range hood.

[0056] With reference to Figure 1 The method for detecting blockage of a check valve in a refrigeration range hood provided by the embodiments includes:

[0057] S1, in response to a high-pressure protection signal generated by the refrigeration range hood, the speed of the indoor fan is reduced.

[0058] S2, obtaining the temperature of the surface of the condenser after a period of time.

[0059] S3, determining whether the check valve is blocked according to the temperature.

[0060] The high-voltage protection signal is a safety mechanism that is automatically triggered when the system detects that the internal pressure or voltage exceeds a safety threshold, in order to prevent equipment damage or safety accidents. When the refrigerant oil fume machine detects that the pressure of the refrigerant exceeds the preset threshold, an electrical signal is output, and the control system stops the operation of some key equipment accordingly, thereby avoiding equipment damage caused by abnormal pressure.

[0061] In a specific example, a non-contact temperature sensor can be used to measure the surface temperature of the condenser. Since the condenser is usually made of sensitive materials such as thin metal sheets or pipes, the non-contact temperature sensor will not cause scratches, indentations, or other forms of damage to the surface of the condenser.

[0062] In an optional embodiment, as shown in Figure 2 S3 specifically includes:

[0063] S31, determining whether the temperature exceeds a first threshold value. If not, step S32 is executed, and if yes, step S33 is executed.

[0064] S32, determining that the check valve is not blocked.

[0065] S33, determining whether the check valve is blocked according to the ambient temperature inside the refrigerant oil fume machine.

[0066] In a specific example, the first threshold value can be set to 40℃. After reducing the speed of the indoor fan for a period of time, if the temperature of the surface of the condenser decreases to below 40℃, it can be determined that the check valve is not blocked. If the temperature of the surface of the condenser still exceeds 40℃, further determination needs to be made according to the ambient temperature inside the refrigerant oil fume machine.

[0067] In an optional embodiment, the refrigerant oil fume machine further includes a compressor, as shown in Figure 3 S33 includes:

[0068] S331, in response to the temperature exceeding the first threshold value, controlling the compressor to be turned off.

[0069] S332, obtaining a first ambient temperature inside the refrigerant oil fume machine after a period of time.

[0070] S333, controlling the compressor to be turned on.

[0071] S334, after a period of time, obtaining a second ambient temperature inside the refrigeration range hood;

[0072] S335, determining whether the check valve is blocked according to the first ambient temperature and the second ambient temperature.

[0073] When the temperature of the condenser surface exceeds the first threshold value, the control system of the refrigeration range hood controls the compressor to be closed, temporarily interrupting the refrigeration cycle, to prevent the refrigeration range hood from continuing to run under abnormal conditions. By closing the compressor, the refrigeration range hood reaches a new thermal equilibrium state, at which time the ambient temperature inside the refrigeration range hood is measured to obtain the first ambient temperature, and then the control system of the refrigeration range hood reopens the compressor, and after a period of time, the ambient temperature inside the refrigeration range hood is measured again to obtain the second ambient temperature. By comparing the first ambient temperature and the second ambient temperature, it is determined whether the check valve is blocked.

[0074] In a specific example, as shown in Figure 4 The ignition protection temperature sensor 101 provided by the refrigeration range hood can be used to measure the internal ambient temperature of the refrigeration range hood. When the temperature of the condenser 102 surface exceeds the first threshold value, the compressor 103 is closed for 10 minutes, the internal ambient temperature of the refrigeration range hood is measured for the first time, and the measured value TZ1 is recorded as the first ambient temperature. Then the compressor is started and runs for 10 minutes, and the internal ambient temperature of the refrigeration range hood is measured for the second time, and the measured value TZ2 is recorded as the second ambient temperature. According to the two measured values TZ1 and TZ2, it is determined whether the check valve is blocked. Other temperature sensors can also be used to measure the internal ambient temperature of the refrigeration range hood.

[0075] The ignition protection temperature sensor provided by the refrigeration range hood can monitor the temperature of the kitchen environment in real time. When the temperature reaches the preset high-temperature threshold for ignition, for example, 75°C, the ignition protection temperature sensor will issue an alarm to indicate the presence of a fire. The temperature rise caused by the blockage of the check valve is usually not more than 75°C. Therefore, monitoring the internal ambient temperature of the refrigeration range hood by the ignition protection temperature sensor provided by the refrigeration range hood can be used to determine whether the check valve is blocked, and will not be confused with the fire alarm.

[0076] In an optional embodiment, the S335 step specifically includes: in response to the difference between the first ambient temperature and the second ambient temperature exceeding a second threshold value, determining that the check valve is blocked.

[0077] If the check valve is normal, indicating that the refrigerant flows smoothly, then after the compressor is restarted, the temperature inside the refrigeration range hood will decrease significantly, and the difference between the first ambient temperature and the second ambient temperature will exceed the second threshold value. On the contrary, if the ambient temperature values measured twice do not change much, i.e. the difference between the first ambient temperature and the second ambient temperature is small, and does not exceed the second threshold value, it indicates that the check valve is blocked, resulting in poor refrigerant flow and affecting the refrigeration effect.

[0078] In a specific example, the second threshold value can be set to 5°C. If the difference between the first ambient temperature and the second ambient temperature exceeds 5°C, it is determined that the check valve of the refrigeration range hood is blocked, and appropriate maintenance measures such as cleaning or replacing the check valve need to be taken to restore the normal operation of the refrigeration range hood.

[0079] In an optional embodiment, the refrigeration range hood further comprises a heat dissipation fan, and before controlling the speed of the indoor fan to decrease, the speed of the heat dissipation fan is controlled to increase.

[0080] Before controlling the speed of the indoor fan to decrease, the heat dissipation effect of the condenser is promoted by controlling the speed of the heat dissipation fan to increase. During the process of increasing the speed of the heat dissipation fan, the user will not perceive the change in the speed of the heat dissipation fan, and therefore the user's comfort will not be directly affected.

[0081] In a specific example, the heat dissipation fan is increased by one gear at a time, and the higher the gear, the faster the speed of the heat dissipation fan, until the heat dissipation fan is increased to the highest gear, at which point it is indicated that the heat dissipation capacity of the heat dissipation fan has reached the maximum. If the refrigeration system load of the refrigeration range hood is normal, the temperature on the surface of the condenser will be effectively controlled.

[0082] In an optional embodiment, the blockage detection method further comprises: in response to the temperature on the surface of the condenser exceeding a preset threshold value, generating a high-pressure protection signal.

[0083] The refrigeration range hood presets a temperature threshold value. When the temperature on the surface of the condenser exceeds this threshold value, the refrigeration range hood considers that there is a high-pressure risk and immediately generates a high-pressure protection signal.

[0084] In a specific example, as Figure 5As shown, after the refrigeration range hood starts to operate, if the user sets the gear of the indoor fan, the indoor fan operates according to the set gear, if not, the indoor fan starts to operate at gear 1, and the user set temperature TS and the indoor return air temperature TR are monitored in real time during the operation; if the indoor return air temperature TR is higher than the set temperature TS by 1℃ or more, it is further judged whether the user sets the working gear of the range hood, if yes, the range hood operates according to the preset working gear, if not, the range hood operates at the minimum gear P1; then the water pump starts to operate, it is judged whether the range hood motor operates normally, if not, the range hood motor fault E1 is output, if the motor operates normally, the gear R of the cooling fan starts to operate from the initial gear 1; if the cooling fan does not operate normally, the range hood motor fault E2 is output, if the cooling fan operates normally, the compressor starts to operate; it is monitored in real time whether the condenser surface temperature TC reaches the warning value, if not, it is judged whether the user indoor return air temperature TR is lower than the user set temperature TS by 2℃ or more, if yes, the compressor stops, at this time, it can be selected whether to end the refrigeration program, if yes, all loads are turned off; if it is monitored that the condenser surface temperature TC reaches the warning value, the gear R of the cooling fan is increased by one gear at a time, then it is judged whether the condenser surface temperature TC is reduced below the warning value, until the gear of the cooling fan is increased to the highest gear 20, and then the indoor fan is reduced to the minimum gear, if the condenser surface temperature TC is still above the warning value, at this time, the refrigeration range hood prompts the user that the machine enters the self-checking mode, records the measurement value of the ignition protection temperature sensor after the compressor is turned off for 10 minutes as TZ1, then the compressor is started to operate for 10 minutes, records the measurement value of the ignition protection temperature sensor at this time as TZ2, if TZ2 exceeds TZ1 by 5℃ or more, the refrigeration range hood outputs the check valve blockage fault E3, if TZ2 does not exceed TZ1 by 5℃ or more, the refrigeration range hood outputs the refrigeration system fault E4, finally, the refrigeration range hood turns off all loads.

[0085] The embodiment of the present disclosure responds to the high pressure protection signal generated by the refrigeration range hood, controls the speed of the indoor fan to be reduced, after a period of time, acquires the temperature of the condenser surface, judges whether the check valve is blocked according to the temperature of the condenser surface, when the refrigeration range hood appears the high pressure protection alarm, it can be quickly judged whether it is caused by the check valve blockage, without disassembling the range hood, the fault reason can be quickly investigated, the fault detection efficiency of the refrigeration range hood is improved, and unnecessary maintenance cost is avoided.

[0086] Embodiment 2

[0087] Corresponding to the foregoing embodiment of the method for detecting blockage of the anti-reverse valve of the refrigeration range hood, the present disclosure also provides an embodiment of a device for detecting blockage of the anti-reverse valve of the refrigeration range hood, which is used to execute the method for detecting blockage of the anti-reverse valve of the refrigeration range hood in embodiment 1.

[0088] Figure 6 A module schematic diagram of a device for detecting blockage of the anti-reverse valve of the refrigeration range hood is provided for the embodiment of the present disclosure, wherein the refrigeration range hood comprises an indoor fan, a condenser, and an anti-reverse valve, and the detection device comprises a control module 11, an acquisition module 12, and a judgment module 13.

[0089] The control module 11 is configured to control the rotation speed of the indoor fan to decrease in response to a high-pressure protection signal generated by the refrigeration range hood.

[0090] The acquisition module 12 is configured to acquire the temperature of the surface of the condenser after a period of time.

[0091] The judgment module 13 is configured to judge whether the anti-reverse valve is blocked according to the temperature.

[0092] The high-pressure protection signal is a safety mechanism that is automatically triggered when the system detects that the internal pressure or voltage exceeds the safety threshold, so as to prevent equipment damage or safety accidents. In the refrigeration system, when it is detected that the pressure of the refrigerant exceeds the preset threshold, these devices will output an electrical signal, and the control system will stop the operation of some key devices accordingly, so as to avoid equipment damage caused by abnormal pressure.

[0093] In a specific example, a non-contact temperature sensor can be used to measure the surface temperature of the condenser. Since the condenser is usually made of sensitive materials such as thin metal sheets or pipes, the non-contact temperature sensor will not cause scratches, indentations, or other forms of damage to the surface of the condenser.

[0094] In an optional implementation, the judgment module 13 is specifically configured to:

[0095] In response to the temperature not exceeding a first threshold, it is judged that the anti-reverse valve is not blocked.

[0096] In response to the temperature exceeding the first threshold, it is judged whether the anti-reverse valve is blocked according to the ambient temperature inside the refrigeration range hood.

[0097] In a specific example, the first threshold can be set to 40℃. After the rotation speed of the indoor fan is decreased for a period of time, if the temperature of the surface of the condenser decreases to below 40℃, it can be judged that the anti-reverse valve is not blocked. If the temperature of the surface of the condenser still exceeds 40℃, further judgment needs to be made according to the ambient temperature inside the refrigeration range hood.

[0098] In an optional embodiment, the refrigeration range hood further comprises a compressor, and the judging module 13 is specifically configured to:

[0099] in response to the temperature exceeding the first threshold, control the compressor to be turned off;

[0100] after a period of time, obtain a first ambient temperature inside the refrigeration range hood;

[0101] control the compressor to be turned on;

[0102] after a period of time, obtain a second ambient temperature inside the refrigeration range hood;

[0103] determine whether the check valve is blocked according to the first ambient temperature and the second ambient temperature.

[0104] When the temperature of the condenser surface exceeds the first threshold, the control system of the refrigeration range hood controls the compressor to be turned off, temporarily interrupts the refrigeration cycle, and prevents the refrigeration range hood from continuing to run under abnormal conditions. By turning off the compressor, the refrigeration range hood reaches a new thermal equilibrium state, at which time the ambient temperature inside the refrigeration range hood is measured to obtain a first ambient temperature, and then the control system of the refrigeration range hood turns on the compressor again, runs for a period of time, and then measures the ambient temperature inside the refrigeration range hood again to obtain a second ambient temperature. By comparing the first ambient temperature and the second ambient temperature, it is determined whether the check valve is blocked.

[0105] In a specific example, as shown in Figure 4 The ignition protection temperature sensor 101 provided in the refrigeration range hood can be used to measure the ambient temperature inside the refrigeration range hood. When the temperature of the condenser 102 surface exceeds the first threshold, the compressor 103 is turned off for 10 minutes, the ambient temperature inside the refrigeration range hood is measured for the first time, and the measured value TZ1 is recorded as the first ambient temperature. Then the compressor is turned on and runs for 10 minutes, the ambient temperature inside the refrigeration range hood is measured for the second time, and the measured value TZ2 is recorded as the second ambient temperature. According to the two measured values TZ1 and TZ2, it is determined whether the check valve is blocked. Other temperature sensors can also be used to measure the ambient temperature inside the refrigeration range hood.

[0106] The ignition protection temperature sensor provided in the refrigeration range hood can monitor the temperature of the kitchen environment in real time. When the temperature reaches the preset high-temperature threshold of ignition, for example, 75℃, the ignition protection temperature sensor will issue an alarm to remind the occurrence of fire. The temperature rise caused by the blockage of the check valve is usually not more than 75℃, so monitoring the ambient temperature inside the refrigeration range hood by the ignition protection temperature sensor provided in the refrigeration range hood can be used to determine whether the check valve is blocked, and will not be confused with the fire alarm.

[0107] In an alternative embodiment, the judging module 13 is specifically configured to judge that the check valve is blocked in response to the difference between the first and second ambient temperatures exceeding a second threshold value.

[0108] If the check valve is normal, indicating that the refrigerant flows smoothly, then after the compressor is restarted, the temperature inside the refrigeration range hood will decrease significantly, and the difference between the first and second ambient temperatures will exceed the second threshold value. Conversely, if the ambient temperature values measured twice do not change much, i.e., the difference between the first and second ambient temperatures is small and does not exceed the second threshold value, it indicates that the check valve is blocked, resulting in poor refrigerant flow and affecting the refrigeration effect.

[0109] In a specific example, the second threshold value can be set to 5°C. If the difference between the first and second ambient temperatures exceeds 5°C, it is judged that the check valve of the refrigeration range hood is blocked, and appropriate maintenance measures such as cleaning or replacing the check valve need to be taken to restore the normal operation of the refrigeration range hood.

[0110] In an alternative embodiment, the control module 11 is further configured to control the speed of the heat dissipation fan to increase before controlling the speed of the indoor fan to decrease.

[0111] By controlling the speed of the heat dissipation fan to increase before controlling the speed of the indoor fan to decrease, the heat dissipation effect of the condenser is promoted. During the process of increasing the speed of the heat dissipation fan, the user will not perceive the change in the speed of the heat dissipation fan, and therefore the user's comfort will not be directly affected.

[0112] In a specific example, the heat dissipation fan is increased by one gear at a time. The higher the gear, the faster the speed of the heat dissipation fan, until it is increased to the highest gear of the heat dissipation fan. At this time, it indicates that the heat dissipation capacity of the heat dissipation fan has reached the maximum limit. If the refrigeration system load of the refrigeration range hood is normal, the temperature on the surface of the condenser will be effectively controlled.

[0113] In an alternative embodiment, the blockage detection device further comprises: generating a high-pressure protection signal in response to the temperature on the surface of the condenser exceeding a preset threshold value.

[0114] The refrigeration range hood presets a temperature threshold value. When the temperature on the surface of the condenser exceeds this threshold value, the refrigeration range hood considers that there is a high-pressure risk and immediately generates a high-pressure protection signal.

[0115] The embodiment of the present disclosure controls the rotation speed of the indoor fan to decrease in response to the high pressure protection signal generated by the refrigeration range hood, acquires the temperature of the surface of the condenser after a period of time, and determines whether the check valve is blocked according to the temperature of the surface of the condenser. When the refrigeration range hood generates a high pressure protection alarm, it can be quickly determined whether the check valve is blocked. The fault cause can be quickly investigated without disassembling the range hood, the fault detection efficiency of the refrigeration range hood is improved, and unnecessary maintenance cost is avoided.

[0116] For the device embodiment, since it basically corresponds to the method embodiment, the relevant part can be referred to the part of the method embodiment. The device embodiment described above is only schematic, and the units described as separate components can or can not be physically separate, and the components of the unit can or can not be physical units, i.e. they can be located in one place or distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the present disclosure scheme.

[0117] Embodiment 3

[0118] Figure 7 A structural schematic diagram of a refrigeration range hood is provided for the embodiment 3 of the present disclosure, the refrigeration range hood includes a memory, a processor and a computer program stored in the memory and used to run on the processor, and the processor implements the above-mentioned refrigeration range hood check valve blockage detection method of the embodiment 1 when executing the computer program. Figure 7 The displayed refrigeration range hood 90 is only an example, and should not bring any limitation to the function and use range of the embodiment of the present disclosure.

[0119] As Figure 7 shown, the refrigeration range hood 90 can be in the form of a general computing device, for example, it can be a server device. The components of the refrigeration range hood 90 can include but are not limited to: the above-mentioned at least one processor 91, the above-mentioned at least one memory 92, the bus 93 connecting different system components including the memory 92 and the processor 91.

[0120] The bus 93 includes a data bus, an address bus and a control bus.

[0121] The memory 92 can include volatile memory, such as random access memory (RAM) 921 and / or cache memory 922, and can further include read-only memory (ROM) 923.

[0122] The memory 92 can also include the program means 925 (or utility tools) having a set (at least one) of program modules 924, such as an operating system, one or more application programs, other program modules, and program data, and each of these examples, or some combination thereof, can include implementation of a network environment.

[0123] The processor 91 performs various function applications and data processing by running the computer program stored in the memory 92, such as the method for detecting the blockage of the reverse valve of the refrigeration range hood provided in Embodiment 1 of the present disclosure.

[0124] The refrigeration range hood 90 can also communicate with one or more external devices 94 (such as a keyboard, a pointing device, etc.). Such communication can be through the input / output (I / O) interface 95. Also, the refrigeration range hood 90 can communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) through a network adapter 96. As Figure 7 illustrated, the network adapter 96 communicates with the other modules of the refrigeration range hood 90 through the bus 93. It should be appreciated that the refrigeration range hood 90 (and its various modules) can be a part of one or more devices, such as a personal computer, a network server, a handheld device, or a multimedia device, for example. Figure 7 It should be appreciated that, although not shown in the foregoing detailed description, other hardware and / or software modules can be used in connection with the refrigeration range hood 90, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID (Redundant Array of Independent Disks) systems, tape drives, and data backup storage systems, etc.

[0125] It should be noted that, although several units / modules or sub-units / modules of the refrigeration range hood are mentioned in the foregoing detailed description, such division is merely exemplary and not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided into multiple units / modules for embodiment.

[0126] Embodiment 4

[0127] The embodiments of the present disclosure also provide a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the method for detecting the blockage of the reverse valve of the refrigeration range hood provided in Embodiment 1.

[0128] More specifically, the readable storage medium can include, but is not limited to: a portable disc, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0129] Embodiment 5

[0130] The embodiment of the present disclosure further provides a computer program product comprising a computer program which, when executed by a processor, implements the method for detecting the blockage of the reverse valve of the oil smoke machine according to the above-mentioned embodiment 1.

[0131] The program code of the computer program product of the present disclosure can be written in any combination of one or more programming languages, and can be executed entirely on the user device, partially on the user device, as a standalone software package, partially on the user device and partially on a remote device, or entirely on a remote device.

[0132] Although the specific embodiments of the present disclosure are described above, those skilled in the art should understand that this is only an illustration, and the protection scope of the present disclosure is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present disclosure, and these changes and modifications all fall within the protection scope of the present disclosure.

Claims

1. A method for detecting blockage in the check valve of a refrigerated range hood, characterized in that, The refrigerated range hood includes an indoor unit fan, a condenser, and a check valve; the detection method includes: In response to the high-pressure protection signal generated by the cooling range hood, the speed of the indoor unit fan is reduced. After a period of time, the temperature of the condenser surface is obtained; The check valve is determined to be blocked based on the temperature.

2. The blockage detection method according to claim 1, characterized in that, The specific steps for determining whether the check valve is blocked based on the temperature include: In response to the temperature not exceeding a first threshold, it is determined that the check valve is not blocked; In response to the temperature exceeding the first threshold, the check valve is determined to be blocked based on the ambient temperature inside the refrigerated range hood.

3. The blockage detection method according to claim 2, characterized in that, The refrigerated range hood also includes a compressor. The step of determining whether the check valve is blocked based on the ambient temperature inside the refrigerated range hood in response to the temperature exceeding the first threshold specifically includes: In response to the temperature exceeding the first threshold, the compressor is controlled to shut down; After a period of time, obtain the first ambient temperature inside the refrigerated range hood; Control the compressor to start; After a period of time, the second ambient temperature inside the refrigerated range hood is obtained; The check valve is determined to be blocked based on the first ambient temperature and the second ambient temperature.

4. The blockage detection method according to claim 3, characterized in that, The specific steps for determining whether the check valve is blocked based on the first ambient temperature and the second ambient temperature include: If the difference between the first ambient temperature and the second ambient temperature exceeds a second threshold, it is determined that the check valve is blocked.

5. The blockage detection method according to claim 1, characterized in that, The refrigerated range hood also includes a cooling fan, and the step of controlling the speed reduction of the indoor unit fan includes the following: Increase the rotation speed of the cooling fan.

6. The blockage detection method according to any one of claims 1-5, characterized in that, The detection method further includes: A high-pressure protection signal is generated in response to the temperature of the condenser surface exceeding a preset threshold.

7. A device for detecting blockage of the backflow preventer valve in a refrigerated range hood, characterized in that, The refrigerated range hood includes an indoor fan, a condenser, and a check valve; the detection device includes a control module, an acquisition module, and a judgment module. The control module is used to respond to the high-pressure protection signal generated by the refrigeration range hood, control the speed of the indoor unit fan to decrease, and call the acquisition module after a period of time; The acquisition module is used to acquire the temperature of the condenser surface; The judgment module is used to determine whether the check valve is blocked based on the temperature.

8. A refrigerated range hood, comprising a memory, a processor, and a computer program stored in the memory and for running on the processor, characterized in that, When the processor executes the computer program, it implements the blockage detection method for the backflow preventer valve of the refrigerated range hood as described in any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the blockage detection method for the backflow preventer valve of the refrigerated range hood as described in any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the blockage detection method for the backflow preventer valve of the refrigerated range hood as described in any one of claims 1-6.

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