Air source heat pump unit and control method and device thereof

Abstract

The invention provides an air source heat pump unit and a control method and device thereof. The air source heat pump unit comprises a water pan and an electric heating device used for heating the water pan. The control method comprises the steps that whether the electric heating device is abnormal or not is judged; and based on the abnormality of the electric heating device, the air source heat pump unit is controlled to send reminding information. According to the control method provided by the embodiment of the invention, the abnormality judgment program of the water pan electric heating device is added, whether the electric heating device is abnormal or not can be judged, and when it is judged that the electric heating device is abnormal, the reminding information can be sent out in time, so that a user can conveniently take countermeasures (such as turning off an air source heat pump unit in time) in time; and greater loss caused by abnormity of the electric heating device of the water pan can be avoided.

Description

Technical Field

[0001] The present application relates to but is not limited to the field of heat pump technology, and specifically refers to an air source heat pump unit and a control method and a control device thereof. Background Art

[0002] Air source heat pump units, because they consume only a small part of the electricity, can absorb most of the heat from the air and transfer it to the water for the production of domestic hot water or heating hot water. They have high energy efficiency and good economic benefits. Now they are gradually becoming the mainstream way to produce domestic hot water or space heating. However, because they use finned heat exchangers, when the ambient temperature is low (generally below 7°C), the surface temperature of the finned heat exchanger is lower than 0°C, and the water vapor in the air will condense into frost on the surface, covering the surface and affecting the heat exchange of the unit. In order to improve the heat exchange efficiency, air source heat pump units will regularly defrost to ensure the operation of the unit. However, after the defrost water flows down, if it is not processed, the defrost water will overflow everywhere. When the temperature is low, it will even freeze, resulting in ice water all around the unit, affecting the maintenance and use of the unit. The industry generally uses a water tray to collect defrost water and condensed water for centralized drainage. However, when the ambient temperature is very low, the defrost water is very likely to freeze and accumulate in the water tray, resulting in poor drainage or even blockage. In severe cases, it may even cause the fin tubes to crack, causing refrigerant leakage or even unit damage. To prevent the defrost water from freezing in the water tray, electric heating is generally used to ensure that the water tray does not freeze.

[0003] However, the following problems still exist in the application of electric heating of the water tray: the electric heating device of the water tray is a key component. If an abnormality occurs, it will lead to greater losses. For example, if a malfunction occurs, it will cause the defrost water to freeze and accumulate, which will quickly cause the heat exchange efficiency of the unit to decline. Ice is more likely to accumulate, which is more likely to cause the fin tubes to crack and the unit to fail. In extreme cases, if there is a problem with the electric heating device of the water tray, it cannot be shut down normally. When the ambient temperature is high, the temperature rise is large, which is easy to cause the risk of dry burning and fire, and there are great safety hazards. Summary of the invention

[0004] The technical problem to be solved by the present application is to provide an air source heat pump unit and its control method and control device, which can promptly issue a reminder message when an abnormality occurs in the electric heating device of the water tray, so that the user can take timely response measures and avoid causing greater losses.

[0005] The embodiment of the present application provides a control method, which is applied to an air source heat pump unit, wherein the air source heat pump unit includes a water receiving tray and an electric heating device for heating the water receiving tray, and the control method includes: Determining whether the electric heating device is abnormal; Based on the abnormality of the electric heating device, the air source heat pump unit is controlled to issue a reminder message.

[0006] The control method provided in the embodiment of the present application adds an abnormality determination procedure for the electric heating device of the water receiving pan, which can determine whether the electric heating device is abnormal, and when it is determined that the electric heating device is abnormal, a reminder message can be issued in time to facilitate the user to take timely response measures (such as shutting down the air source heat pump unit in time), which is conducive to avoiding greater losses due to the abnormality of the electric heating device of the water receiving pan.

[0007] Based on the above technical solution, the present application can also be improved as follows.

[0008] In some exemplary embodiments, the determining whether the electric heating device is abnormal includes: before starting the compressor of the air source heat pump unit, determining whether the electric heating device is abnormally turned on.

[0009] In some embodiments, the determining whether the electric heating device is abnormally turned on includes: determining whether the electric heating device is abnormally turned on according to the current ambient temperature and the current standby power of the air source heat pump unit.

[0010] In some embodiments, judging whether the electric heating device is abnormally turned on based on the current ambient temperature and the current standby power of the air source heat pump unit includes: determining a first set temperature interval based on the current ambient temperature; determining a corresponding first set standby power range based on the first set temperature interval where the current ambient temperature is located; judging that the electric heating device is abnormally turned on based on that the current standby power of the air source heat pump unit is within the corresponding first set standby power range; wherein, there are multiple first set temperature intervals, and each first set temperature interval corresponds to a first set standby power range.

[0011] Before turning on the compressor of the air source heat pump unit, judging whether the electric heating device is turned on abnormally can help avoid problems such as dry burning and fire caused by the electric heating device of the water tray failing to shut down normally, and can help reduce safety hazards.

[0012] In some exemplary embodiments, the control method further includes: in response to a shutdown instruction, based on the current ambient temperature being in a third temperature range, controlling the compressor of the air source heat pump unit to shut down, and controlling the electric heating device to delay shutdown after the compressor is shut down; determining whether the electric heating device is abnormal includes: determining whether the electric heating device is abnormally shut down based on the compressor being shut down and the electric heating device being in a delayed shutdown process.

[0013] In some embodiments, the determining whether the electric heating device is abnormally shut down includes: determining whether the electric heating device is abnormally shut down according to the current ambient temperature and the current standby power of the air source heat pump unit.

[0014] In some embodiments, judging whether the electric heating device is abnormally shut down based on the current ambient temperature and the current standby power of the air source heat pump unit includes: determining a corresponding second set standby power range based on a third temperature interval in which the current ambient temperature is located; and judging that the electric heating device is abnormally shut down based on that the current standby power of the air source heat pump unit is lower than a lower limit value of the corresponding second set standby power range.

[0015] After the compressor stops, the electric heating device of the water tray is turned off with a delay, which is helpful to ensure that the water in the water tray is completely drained and to prevent the water tray from freezing. During the process of the electric heating device of the water tray being turned off with a delay after the compressor stops, it is judged whether the electric heating device is turned off abnormally, which is helpful to avoid the failure of the electric heating device, which may lead to the attenuation of the heat exchange efficiency of the unit, the cracking of the fin tube, and the failure of the unit during subsequent use.

[0016] In some exemplary embodiments, controlling the electric heating device to delay shutdown after the compressor stops, includes: controlling the electric heating device to delay shutdown for a first set time ts1 after the compressor stops; judging whether the electric heating device is abnormally shut down based on the compressor stopping and the electric heating device being in the process of delayed shutdown, includes: judging whether the electric heating device is abnormally shut down within the time period from △t1 to ts1-△t2 after the compressor stops; wherein △t1 is the second set time, △t2 is the third set time, 0≤△t1<ts1, 0<△t2<ts1.

[0017] After the compressor stops, the system starts to judge whether the electric heating device of the water tray is abnormally shut down after a delay of △t1, so as to ensure that other high-power components (such as water pumps and fans) have been shut down when judging. At △t2 before the electric heating device of the water tray is shut down, the system ends judging whether the electric heating device of the water tray is abnormally shut down, which helps to avoid misjudgment caused by the delay caused by the transmission of electrical signals in the last △t2 period.

[0018] In some exemplary embodiments, the control method further includes: acquiring a current ambient temperature in response to a power-on instruction; determining a control strategy for the electric heating device according to the current ambient temperature; and controlling the electric heating device according to the control strategy.

[0019] In some embodiments, determining the control strategy of the electric heating device based on the current ambient temperature includes: determining a second set temperature range based on the current ambient temperature; determining the control strategy based on the second set temperature range in which the current ambient temperature is located; wherein the number of the second set temperature ranges is multiple, and each second set temperature range corresponds to one control strategy.

[0020] In some embodiments, the multiple second set temperature intervals include a first temperature interval, a second temperature interval and a third temperature interval, the temperature of the first temperature interval is greater than the temperature of the second temperature interval, and the temperature of the second temperature interval is greater than the temperature of the third temperature interval; the control strategy corresponding to the first temperature interval includes: controlling the electric heating device to remain in a normally closed state; the control strategy corresponding to the second temperature interval includes: controlling the electric heating device to be turned on at least during part of the defrosting process; the control strategy corresponding to the third temperature interval includes: controlling the electric heating device to remain in a normally open state.

[0021] In some embodiments, the second temperature interval includes multiple sub-temperature intervals, and different sub-temperature intervals correspond to different sub-control strategies; in different sub-control strategies, the start-up timing and / or shutdown timing of the electric heating device are different, and the start-up time of the electric heating device decreases with the increase of temperature values ​​of different sub-temperature intervals.

[0022] Determining the control strategy of the electric heating device of the water tray according to the current ambient temperature can match the use of the electric heating device with the current working conditions, which is beneficial to avoid the situation where it is not energy-saving to keep it on all the time or the chassis is frozen when it is on less frequently.

[0023] In some exemplary embodiments, the control method further includes: based on the current ambient temperature being in the first temperature range and receiving a shutdown command, controlling the air source heat pump unit to shut down; based on the current ambient temperature being in the second temperature range and receiving a shutdown command, controlling the air source heat pump unit to shut down; based on the current ambient temperature being in the third temperature range and receiving a shutdown command, controlling the compressor of the air source heat pump unit to shut down, and controlling the electric heating device to delay shutdown after the compressor shuts down.

[0024] An embodiment of the present application further provides a control device, including a processor and a memory storing a computer program, wherein the processor implements the steps of the control method described in any one of the above embodiments when executing the computer program.

[0025] An embodiment of the present application also provides an air source heat pump unit, comprising the control device as described in the above embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A flow chart of a control method provided in some embodiments of the present application; Figure 2 A flowchart of a control method provided for one embodiment of the present application. DETAILED DESCRIPTION

[0027] The principles and features of the present application are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present application and are not used to limit the scope of the present application.

[0028] The embodiment of the present application provides a control method, which is applied to an air source heat pump unit. The air source heat pump unit includes a water receiving tray and an electric heating device for heating the water receiving tray. The electric heating device of the water receiving tray can be, but is not limited to, an electric heating belt.

[0029] like Figure 1 As shown, the control method includes: Step S102: determining whether the electric heating device is abnormal; Step S104: Based on the abnormality of the electric heating device, the air source heat pump unit is controlled to issue a reminder message.

[0030] The control method provided in the embodiment of the present application adds an abnormality determination procedure for the electric heating device of the water receiving pan, which can determine whether the electric heating device is abnormal, and when it is determined that the electric heating device is abnormal, a reminder message can be issued in time to facilitate the user to take timely response measures (such as shutting down the air source heat pump unit in time), which is conducive to avoiding greater losses due to the abnormality of the electric heating device of the water receiving pan.

[0031] In some exemplary embodiments, Figure 2 As shown, the control method also includes: Based on the abnormality of the electric heating device, the air source heat pump unit is controlled to shut down.

[0032] In this way, the air source heat pump unit can automatically shut down in time when it is determined that the electric heating device is abnormal, which is conducive to avoiding the user's failure to find the reminder information in time and fail to take correct countermeasures in time, and thus is also conducive to avoiding greater losses caused by abnormalities in the water pan electric heating device.

[0033] In some exemplary embodiments, determining whether the electric heating device is abnormal includes: Before turning on the compressor of the air source heat pump unit, determine whether the electric heating device is turned on abnormally.

[0034] Before turning on the compressor of the air source heat pump unit, if it is determined that the electric heating device of the water tray is abnormally turned on, it means that there was a problem with the electric heating device of the water tray after the last use and it failed to shut down normally. At this time, if the air source heat pump unit continues to be used, it may cause a large temperature rise, which may easily lead to risks such as dry burning and fire, and pose a major safety hazard. At this time, by issuing a reminder message in a timely manner, the user can know that the electric heating device is abnormal and suspend the use of the air source heat pump unit, and carry out maintenance in time to avoid causing greater losses.

[0035] Therefore, before turning on the compressor of the air source heat pump unit, judging whether the electric heating device is turned on abnormally can help avoid problems such as dry burning and fire caused by the failure of the electric heating device of the water tray to be turned off normally, and help reduce safety hazards.

[0036] In some exemplary embodiments, determining whether the electric heating device is abnormally turned on includes: determining whether the electric heating device is abnormally turned on according to the current ambient temperature and the current standby power of the air source heat pump unit.

[0037] In some embodiments, judging whether the electric heating device is abnormally turned on according to the current ambient temperature and the current standby power of the air source heat pump unit includes: Determine a first set temperature interval according to the current ambient temperature; Determine a first set standby power range corresponding to the first set temperature interval of the current ambient temperature; Based on the current standby power of the air source heat pump unit being lower than the corresponding lower limit of the first set standby power, it is determined that the electric heating device is normal; Based on the fact that the current standby power of the air source heat pump unit is within the corresponding first set standby power range, it is determined that the electric heating device is abnormally turned on.

[0038] There are multiple first set temperature intervals (eg, two, three, four or more), and each first set temperature interval corresponds to a first set standby power range. The current standby power can be detected by a power detection chip of the air source heat pump unit.

[0039] Since the compressor of the air source heat pump unit is the component that consumes the most power, the on and off of the compressor can be used to distinguish the working state and standby state of the air source heat pump unit. When the air source heat pump unit is turned on, if the compressor is turned on, the air source heat pump unit is in the working state; if the compressor is turned off, the air source heat pump unit is in the standby state, so the power consumed by the air source heat pump unit at this time can be called standby power.

[0040] The power components of the air source heat pump unit can be divided into three categories: 1) High-power components, such as compressors, fans, water pumps and other components, which have relatively large operating power; 2) Medium-power components, such as various electric heating components (such as compressor crankcase heating belt, heat exchanger antifreeze heating belt, expansion tank electric heating belt, water tray electric heating device), have moderate operating power and basically unchanged, so they can also be called fixed power components, but the operating power of the water tray electric heating device is much greater than the operating power of other electric heating components; 3) Low-power components, such as wire controllers, display screens, solenoid valve coils and other components, have very small operating power.

[0041] Therefore, compared with the operating power of the electric heating device of the water receiving tray, the operating power of the high-power component is significantly larger, and the operating power of the low-power component and the operating power of other electric heating components are much smaller. Moreover, under different ambient temperatures, each power device has a different standby power consumption. Therefore, in the standby state before the compressor is turned on, if the electric heating device of the water receiving tray is started and operated, the standby power of the unit will be significantly higher than the power of other electric heating components and low-power components when they are abnormally turned on, and significantly lower than the power of high-power components when they are abnormally turned on. Therefore, it is possible to judge whether the electric heating device of the water receiving tray is turned on based on the comparison between the standby power and the corresponding first set standby power range (that is, the first set standby power range corresponding to the first set temperature interval of the current ambient temperature).

[0042] Therefore, before the compressor is turned on, it is possible to determine whether the electric heating device is abnormally turned on based on the current ambient temperature and the current standby power of the air source heat pump unit. If the current standby power of the air source heat pump unit is within the first set standby power range corresponding to the current ambient temperature, it indicates that the electric heating device of the water tray is in the on state, but the unit has just been started and has not yet run, but the electric heating device is in the on state, so it is determined that the electric heating device of the water tray is abnormally turned on. If the current standby power of the air source heat pump unit is lower than the lower limit of the first set standby power range corresponding to the current ambient temperature, it indicates that the unit is normal, so the electric heating device of the water tray is also normal and is not abnormally turned on. If the current standby power of the air source heat pump unit is higher than the upper limit of the first set standby power range corresponding to the current ambient temperature, it indicates that the unit has other abnormalities.

[0043] Among them, the standby power of the unit is recorded as W, and the first set standby power range can be: Wksmin≤W≤Wksmax (or Wksmin<W<Wksmax, or Wksmin≤W<Wksmax, or Wksmin<W≤Wksmax, that is, the critical value can be placed within the interval or outside the interval), Wksmin is the first set standby power threshold lower limit value, and Wksmax is the first set standby power threshold upper limit value.

[0044] It can be: Wksmin = the sum of the standby powers of high-power devices + the sum of the standby powers of low-power devices + the sum of the standby powers of other electric heating devices + the operating power of the electric heating device of the water tray × a1%. Wksmax = the sum of the standby powers of high-power devices + the sum of the standby powers of low-power devices + the sum of the standby powers of other electric heating devices + the operating power of the electric heating device of the water tray × b1%. a1<100<b1.

[0045] In other words, Wksmin represents the minimum standby power of the whole machine when other power devices are in standby state but the electric heating device of the water tray is in operation. Wksmax represents the maximum standby power of the whole machine when other power devices are in standby state but the electric heating device of the water tray is in operation. The setting of a1 and b1 is conducive to avoiding misjudgment caused by power error caused by the actual operating power of the electric heating device of the water tray deviating from the rated power due to voltage fluctuation or other factors. The specific values ​​of a1 and b1 are not restricted and can be reasonably set as needed. For example, 85≤a1≤95, such as 85, 90, 95, etc., 105≤b1≤115, such as 105, 110, 115, etc.

[0046] In some embodiments, the upper limit and lower limit of the first set standby power range decrease as the temperature values ​​of different first set temperature intervals increase, that is, for different first set temperature intervals, the higher the ambient temperature, the smaller the upper limit and lower limit of the first set standby power range.

[0047] Since the higher the ambient temperature, the higher the energy efficiency of the air source heat pump unit, the lower the power consumed. Therefore, the higher the ambient temperature, the lower the upper limit and lower limit of the first set standby power range.

[0048] For example: Figure 2 As shown, the number of the first set temperature intervals is three, namely: ambient temperature ≥ A, B ≤ ambient temperature < A, ambient temperature < B, A > B.

[0049] When the ambient temperature is ≥A, the first set standby power range is: Wksmin1≤W≤Wksmax1. When B≤ambient temperature<A, the first set standby power range is: Wksmin2≤W≤Wksmax2. When the ambient temperature is <B, the first set standby power range is: Wksmin3≤W≤Wksmax3. Among them, Wksmax3>Wksmin3>Wksmax2>Wksmin2>Wksmax1>Wksmin1.

[0050] The specific values ​​of A and B are not limited and can be adjusted as needed. The specific values ​​of Wksmin1, Wksmin2, Wksmin3, Wksmax1, Wksmax2, and Wksmax3 are not limited and can be adjusted as needed.

[0051] In one example, -5°C≤A≤5°C, such as -5°C, -2°C, 0°C, 2°C, 5°C, etc. -20°C≤B≤-10°C, such as -20°C, -15°C, -10°C, 5°C, 10°C, 15°C, 20°C, etc. 20W≤Wksmin1<Wksmax1≤60W, such as Wksmin1 / Wksmax1 can be 20W, 30W, 40W, 50W, 60W, etc. 60W≤Wksmin2<Wksmax2≤100W, such as Wksmin2 / Wksmax2 can be 60W, 70W, 80W, 90W, 100W, etc. 100W≤Wksmin3<Wksmax3≤140W, such as Wksmin3 / Wksmax3 can be 100W, 110W, 120W, 130W, 140W, etc.

[0052] In some exemplary embodiments, Figure 2 As shown, the control method further includes: in response to the shutdown instruction, based on the current ambient temperature being in the third temperature range, controlling the compressor of the air source heat pump unit to shut down, and controlling the electric heating device to delay shutting down after the compressor shuts down. The third temperature range can be: ambient temperature < B. The specific value of B is not limited and can be reasonably set as needed.

[0053] When the ambient temperature is in the third temperature range, it indicates that the ambient temperature is low. At this time, when the compressor stops, the water in the water tray may not be completely drained, and there is a possibility of freezing at low temperature. Therefore, after the compressor stops, the electric heating device of the water tray is delayed to close, which is conducive to ensuring that the water in the water tray is completely drained and preventing the water tray from freezing.

[0054] In some embodiments, determining whether the electric heating device is abnormal includes: determining whether the electric heating device is abnormally shut down based on the compressor being shut down and the electric heating device being in a delayed shut down process.

[0055] After the compressor stops, the electric heating device of the water tray will continue to work for a period of time, that is, delayed shutdown. During this period of time, if the electric heating device of the water tray is determined to be abnormally shut down, it indicates that the electric heating device of the water tray is faulty and has failed, so a reminder message needs to be issued to facilitate users to know that the electric heating device of the water tray is abnormal and suspend the use of the air source heat pump unit, and perform maintenance in time to avoid continuing to use the unit in the subsequent period of time when the electric heating device fails, causing greater losses.

[0056] Therefore, during the delayed shutdown process of the electric heating device of the water pan after the compressor stops, judging whether the electric heating device is shut down abnormally is helpful to avoid the failure of the electric heating device leading to a decrease in the heat exchange efficiency of the unit, cracking of the fin tubes, and unit failure during subsequent use.

[0057] In some exemplary embodiments, determining whether the electric heating device is abnormally shut down includes: determining whether the electric heating device is abnormally shut down according to the current ambient temperature and the current standby power of the air source heat pump unit.

[0058] In some embodiments, judging whether the electric heating device is abnormally shut down according to the current ambient temperature and the current standby power of the air source heat pump unit includes: Determine a corresponding second set standby power range according to a third temperature interval where the current ambient temperature is located; Based on the current standby power of the air source heat pump unit being lower than the corresponding second set standby power range, determining that the electric heating device is abnormally shut down; Based on the fact that the current standby power of the air source heat pump unit is within the corresponding second set standby power range, it is determined that the electric heating device is normal.

[0059] When the air source heat pump unit is turned on, if the compressor is turned off, the other high-power components of the air source heat pump unit will generally shut down directly or after a short delay (much less than the delayed shutdown time of the electric heating device of the water tray), so the power consumed by the air source heat pump unit at this time can be called standby power. As mentioned above, compared with the operating power of the electric heating device of the water tray, the operating power of the high-power components is significantly larger, and the operating power of the low-power components and other electric heating components is much smaller. Therefore, in the standby state of the delayed shutdown of the electric heating device of the water tray, if the electric heating device of the water tray fails to shut down, the standby power of the unit will be significantly lower than the standby power when the electric heating device of the water tray is normally turned on. Therefore, it is possible to judge whether the electric heating device of the water tray is abnormally shut down based on the comparison of the standby power with the corresponding second set standby power range (that is, the second set standby power range corresponding to the third temperature interval where the current ambient temperature is located).

[0060] Therefore, after the compressor is turned off, it is possible to determine whether the electric heating device is abnormally shut down based on the current ambient temperature and the current standby power of the air source heat pump unit. If the current standby power of the air source heat pump unit is within the second set standby power range corresponding to the current ambient temperature, it indicates that the electric heating device of the water receiving pan is in a normal heating state, so the electric heating device is determined to be normal. If the current standby power of the air source heat pump unit is lower than the lower limit of the second set standby power range corresponding to the current ambient temperature, it indicates that the electric heating device of the water receiving pan is in a shut down state, so the electric heating device of the water receiving pan is determined to be abnormally shut down.

[0061] Among them, the standby power of the unit is recorded as W, and the second set standby power range can be: Wgsmin≤W≤Wgsmax (or Wgsmin<W<Wgsmax, or Wgsmin≤W<Wgsmax, or Wgsmin<W≤Wgsmax, that is, the critical value can be placed within the interval or outside the interval), Wgsmin is the second set standby power threshold lower limit value, and Wgsmax is the second set standby power threshold upper limit value.

[0062] Moreover, in a low temperature environment (i.e., the ambient temperature is in the third temperature range), after the compressor stops, the electric heating components such as the compressor crankcase electric heating belt, the heat exchanger electric heating belt, and the expansion tank electric heating belt also need to be delayed to shut down. Therefore, in the process of the electric heating device of the water tray needing to be delayed to shut down after the compressor stops, the normal standby power of the air source heat pump unit should be greater than the standby power of the unit when it is turned on in the same ambient temperature range. Therefore, for the third temperature range, the corresponding lower limit value Wksmin3 of the first set power range is less than the lower limit value Wgsmin of the second set power range, and the upper limit value Wgsmax3 of the first set power range is less than the upper limit value Wgsmax of the second set power range.

[0063] It can be: Wgsmin = sum of standby power of high-power devices + sum of standby power of low-power devices + sum of operating power of other electric heating devices + operating power of electric heating device of water tray × a2%. Wgsmax = sum of standby power of high-power devices + sum of standby power of low-power devices + sum of operating power of other electric heating devices + operating power of electric heating device of water tray × b2%. a2<100<b2.

[0064] In other words, Wgsmin represents the minimum value of the standby power of the whole machine when each electric heating component is in operation and other power devices are in standby state. Wgsmax represents the maximum value of the standby power of the whole machine when each electric heating component is in operation and other power devices are in standby state. The setting of a2 and b2 is conducive to avoiding the misjudgment caused by the power error caused by the actual operating power of the electric heating device of the water receiving tray deviating from the rated power due to voltage fluctuation or other factors. The specific values ​​of a2 and b2 are not limited and can be reasonably set as needed. For example, 85≤a2≤95, such as 85, 90, 95, etc., 105≤b2≤115, such as 105, 110, 115, etc. Or, because the operating power of other electric heating components is relatively small, in the standby state where the electric heating device of the water receiving tray is turned on and the high-power device is turned off, the impact on the power of the whole machine is not significant, so the first set power range corresponding to the third temperature interval can also be the same as the second set power range, and it is only necessary to reasonably adjust the size of a1 and b1.

[0065] In some embodiments, the third temperature interval may include multiple sub-temperature intervals (such as two, three, four or more), each of which may correspond to a second set standby power range. The current standby power may be detected by a power detection chip of the air source heat pump unit.

[0066] The upper limit and lower limit power values ​​of the second set standby power range decrease as the temperature values ​​of different sub-temperature intervals increase, that is, for different sub-temperature intervals, the higher the ambient temperature, the smaller the upper limit and lower limit power values ​​of the second set standby power range.

[0067] Since the higher the ambient temperature, the higher the energy efficiency of the air source heat pump unit, the lower the power consumed. Therefore, the higher the ambient temperature, the lower the upper limit and lower limit of the second set standby power range. Of course, the third temperature interval may not include multiple sub-temperature intervals and is not further divided.

[0068] In one embodiment, Figure 2 As shown, the third temperature range is: ambient temperature < B, -20°C ≤ B ≤ -10°C, such as -20°C, -15°C, -10°C, 5°C, 10°C, 15°C, 20°C, etc.

[0069] The second set standby power range is: Wgsmin≤W≤Wgsmax, 200W≤Wgsmin<Wgsmax≤800W, for example, Wgsmin / Wgsmax can be 200W, 300W, 400W, 500W, 600W, 700W, 800W, etc.

[0070] In some exemplary embodiments, controlling the electric heating device to delay turning off after the compressor stops includes: controlling the electric heating device to delay turning off for a first set time period ts1 after the compressor stops.

[0071] Based on the compressor being stopped and the electric heating device being in the process of delayed shutdown, judging whether the electric heating device is abnormally shut down, including: judging whether the electric heating device is abnormally shut down in the time period from △t1 to ts1-△t2 after the compressor is stopped. Wherein, △t1 is the second set time length, △t2 is the third set time length, 0≤△t1<ts1, 0<△t2<ts1.

[0072] In other words, after the compressor stops, the delay △t1 starts to determine whether the electric heating device of the water tray is abnormally shut down, so as to ensure that other high-power components (such as water pumps and fans) have stopped when judging. △t1 can be determined according to the delayed shutdown time of other high-power components. If other high-power components stop together with the compressor, △t1 can be 0.

[0073] At Δt2 before the electric heating device of the water receiving tray is turned off, the judgment of whether the electric heating device of the water receiving tray is abnormally turned off is ended, which is beneficial to avoid misjudgment caused by the delay caused by the electrical signal transmission in the last Δt2 time period.

[0074] Among them, the specific values ​​of ts1, △t1, and △t2 are not restricted and can be adjusted as needed.

[0075] In one example, 20min≤ts1≤40min, such as 20min, 25min, 30min, 35min, 40min, etc. 0≤△t1≤2min, such as 0, 1min, 2min, etc. 1min≤△t2≤10min, such as 1min, 2min, 5min, 8min, 10min, etc.

[0076] In the related art, the electric heating of the water tray still has the following problems in application: the power of the electric heating device of the water tray is fixed, but the amount of defrost water under different ambient temperatures and different humidity is not the same, and the freezing rate of defrost water under different ambient temperatures is also different. If the electric heating device is turned on for a short time, the defrost water will not be discharged in time and will still cause freezing; if the electric heating device is turned on for a long time, it will increase the energy consumption of the unit and reduce the economy. How to adopt a suitable control strategy to balance reliability and energy saving is a major problem. Therefore, the embodiment of the present application improves the control logic of the electric heating device of the water tray to balance the reliability and energy saving of defrost water discharge.

[0077] In some exemplary embodiments, the control method further includes: In response to a power-on instruction, obtaining a current ambient temperature; Determine the control strategy of the electric heating device according to the current ambient temperature; The electric heating device is controlled according to the control strategy.

[0078] The freezing rate of defrost water is mainly related to the ambient temperature, and the generation and discharge of defrost water are also mainly concentrated in the defrosting process. Therefore, determining the control strategy of the electric heating device of the water tray according to the current ambient temperature can match the use of the electric heating device with the current working conditions, which is conducive to avoiding the situation where it is often turned on and does not save energy, and the bottom plate is frozen when it is turned on less.

[0079] In some exemplary embodiments, determining a control strategy of the electric heating device according to the current ambient temperature includes: Determine the second set temperature range according to the current ambient temperature; The control strategy is determined according to the second set temperature interval in which the current ambient temperature is located.

[0080] There are multiple second set temperature intervals (for example, two, three, four or more), and each second set temperature interval corresponds to a control strategy.

[0081] In some embodiments, the plurality of second set temperature intervals include a first temperature interval, a second temperature interval, and a third temperature interval, the temperature of the first temperature interval is greater than the temperature of the second temperature interval, and the temperature of the second temperature interval is greater than the temperature of the third temperature interval.

[0082] The control strategy corresponding to the first temperature interval includes: controlling the electric heating device to maintain a normally closed state.

[0083] The control strategy corresponding to the second temperature interval includes: controlling the electric heating device to be turned on at least during a part of the defrosting process.

[0084] The control strategy corresponding to the third temperature interval includes: controlling the electric heating device to remain in a normally open state.

[0085] When the ambient temperature is in the first temperature range, it indicates that the ambient temperature is relatively high (such as in summer), and the water tray will basically not freeze at this time, so the electric heating device of the water tray can be kept in a normally closed state after the unit is turned on.

[0086] When the ambient temperature is in the third temperature range, it indicates that the ambient temperature is relatively low (such as in winter). At this time, the probability of the water tray freezing is very high, so the electric heating device of the water tray remains in the open state after the unit is started.

[0087] When the ambient temperature is in the second temperature range, it indicates that the ambient temperature is moderate. If the unit enters the defrost mode, it indicates that the ambient temperature is low and the water tray may also freeze. Therefore, the electric heating device of the water tray is turned on at least during part of the defrost process to allow the defrosted water to be discharged smoothly. The electric heating device may be turned on only during part of the defrost process, during the entire defrost process, or for a period of time after the defrost is completed.

[0088] The division of the second set temperature interval may be completely consistent with the division of the first set temperature interval, may not be completely consistent, or may not be completely consistent.

[0089] In one example, the divisions of the first set temperature interval and the second set temperature interval are completely consistent, which is conducive to simplifying the electronic control program.

[0090] For example: Figure 2As shown, the number of the second set temperature intervals is three, namely: ambient temperature ≥ A (first temperature interval), B ≤ ambient temperature < A (second temperature interval), ambient temperature < B (third temperature interval), A > B. 5℃ ≤ A ≤ 5℃, such as -5℃, -2℃, 0℃, 2℃, 5℃, etc. -20℃ ≤ B ≤ -10℃, such as -20℃, -15℃, -10℃, 5℃, 10℃, 15℃, 20℃, etc.

[0091] When the ambient temperature is ≥A, the electric heating device of the water tray remains in the normally closed state after the machine is turned on.

[0092] When B≤ambient temperature<A, the electric heating device of the water receiving tray is turned on at least during a part of the defrosting process after the machine is turned on.

[0093] When the ambient temperature is less than B, the electric heating device of the water tray remains in the normally open state after the machine is turned on.

[0094] In some exemplary embodiments, the second temperature interval includes multiple (such as two, three, four or more) sub-temperature intervals, and different sub-temperature intervals correspond to different sub-control strategies. Of course, the second temperature interval may not include multiple sub-temperature intervals.

[0095] In different sub-control strategies, the start-up time and / or the shut-down time of the electric heating device are different, and the start-up time of the electric heating device decreases as the temperature value of different sub-temperature intervals increases. 。 The on time of the electric heating device refers to the total time from the on time (i.e. the time corresponding to the on timing) to the off time (i.e. the time corresponding to the off timing).

[0096] In other words, the lower the ambient temperature, the longer the duration of the electric heating device of the water receiving tray being turned on. The higher the ambient temperature, the shorter the duration of the electric heating device of the water receiving tray being turned on.

[0097] For example, in different sub-control strategies, the water tray electric heating device is turned on at different times, for example, it can be turned on at the beginning of the defrost mode, or it can be turned on after the defrost mode runs for a period of time, or it can be turned on a period of time before the defrost mode starts. In different sub-control strategies, the water tray electric heating device is turned off at different times, for example, it can be turned off at the end of the defrost mode, or it can be turned off a period of time after the end of the defrost mode, or it can be turned off a period of time before the end of the defrost mode.

[0098] For example, there are three sub-temperature intervals, namely: B ≤ ambient temperature < C1 (first sub-temperature interval), C1 ≤ ambient temperature < C2 (second sub-temperature interval), C2 ≤ ambient temperature < A (third sub-temperature interval), B < C1 < C2 < A. The specific sizes of C1 and C2 are not limited and can be reasonably set as needed.

[0099] When C2≤ambient temperature<A, the electric heating device of the water tray is turned on when defrosting begins and turned off when defrosting ends.

[0100] When C1≤ambient temperature<C2, the electric heating device of the water tray is turned on when the defrosting starts, and is turned off after the fourth set time ts2 after the defrosting ends.

[0101] When B≤ambient temperature<C1, the electric heating device of the water tray is turned on when the defrosting starts, and is turned off after the fifth set time ts3 after the defrosting ends, ts3>ts2.

[0102] In some exemplary embodiments, Figure 2 As shown, the control method also includes: Based on the current ambient temperature being in the first temperature range, a shutdown command is received, and the air source heat pump unit is controlled to shut down; Based on the current ambient temperature being in the second temperature range, a shutdown command is received, and the air source heat pump unit is controlled to shut down; Based on the fact that the current ambient temperature is in the third temperature range, a shutdown command is received, the compressor of the air source heat pump unit is controlled to shut down, and the electric heating device is controlled to delay shutdown after the compressor shuts down.

[0103] When the ambient temperature is in the first temperature range or the second temperature range, it indicates that the ambient temperature is not too low, so there is not too much defrost water, and the risk of defrost water freezing in the water tray is low. Therefore, after receiving the shutdown command, the unit can be shut down directly, and the electric heating device of the water tray does not need to be shut down later.

[0104] When the ambient temperature is in the third temperature range, it indicates that the ambient temperature is very low, there may be a lot of defrost water, and the risk of defrost water freezing in the water tray is high. Therefore, after receiving the shutdown command, the compressor will stop first, and the electric heating device of the water tray will continue to work for a period of time before shutting down, which is conducive to ensuring that the defrost water in the water tray can be discharged smoothly.

[0105] An embodiment of the present application also provides a control device, including a processor and a memory storing a computer program. When the processor executes the computer program, the steps of the control method in any of the above embodiments are implemented, and thus all the above-mentioned beneficial effects are achieved, which will not be repeated here.

[0106] The processor may be an integrated circuit chip with signal processing capabilities. The above-mentioned processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0107] The embodiment of the present application also provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the steps of the control method in any of the above embodiments are implemented, thereby having all the above-mentioned beneficial effects, which will not be repeated here.

[0108] The embodiment of the present application also provides an air source heat pump unit, including the control device of the above embodiment, and thus has all the above beneficial effects, which will not be repeated here.

[0109] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0110] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0111] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0112] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0113] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0114] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

[0115] In any one or more of the above exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on a computer-readable medium or transmitted via a computer-readable medium as one or more instructions or codes, and executed by a hardware-based processing unit. A computer-readable medium may include a computer-readable storage medium corresponding to a tangible medium such as a data storage medium, or a communication medium that facilitates a computer program, such as any medium transmitted from one place to another according to a communication protocol. In this way, a computer-readable medium may generally correspond to a non-temporary tangible computer-readable storage medium or a communication medium such as a signal or carrier wave. A data storage medium may be any available medium that can be accessed by one or more computers or one or more processors to retrieve instructions, codes, and / or data structures for implementing the technology described in the present disclosure. A computer program product may include a computer-readable medium.

[0116] By way of example and not limitation, such computer-readable storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage devices, magnetic disk storage devices or other magnetic storage devices, flash memory or any other medium that can be used to store the desired program code in the form of instructions or data structures and can be accessed by a computer. Moreover, any connection may also be referred to as a computer-readable medium. For example, if instructions are transmitted from a website, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technologies such as infrared, radio and microwave, then coaxial cable, fiber optic cable, double-stripe line, DSL or wireless technologies such as infrared, radio and microwave are included in the definition of medium. However, it should be understood that computer-readable storage media and data storage media do not include connections, carriers, signals or other transient (transient) media, but are directed to non-transient tangible storage media. As used herein, disks and optical disks include compact disks (CDs), laser optical disks, optical optical disks, digital versatile disks (DVDs), floppy disks or Blu-ray disks, etc., where disks typically reproduce data magnetically, and optical disks use lasers to reproduce data optically. Combinations of the above should also be included within the scope of computer-readable media.

[0117] For example, instructions may be executed by one or more processors such as one or more digital signal processors (DSPs), general-purpose microprocessors, application-specific integrated circuits (ASICs), field programmable logic arrays (FPGAs), or other equivalent integrated or discrete logic circuits. Therefore, the term "processor" as used herein may refer to any of the above structures or any other structures suitable for implementing the techniques described herein. In addition, in some aspects, the functionality described herein may be provided in dedicated hardware and / or software modules configured for encoding and decoding, or incorporated in a combined codec. Furthermore, the techniques may be fully implemented in one or more circuits or logic elements.

[0118] The technical solutions of the embodiments of the present disclosure can be implemented in a wide variety of devices or equipment, including wireless mobile phones, integrated circuits (ICs) or a group of ICs (e.g., chipsets). Various components, modules or units are described in the embodiments of the present disclosure to emphasize the functional aspects of the devices configured to perform the described technologies, but they do not necessarily need to be implemented by different hardware units. Instead, as described above, the various units can be combined in a codec hardware unit or provided by a collection of interoperable hardware units (including one or more processors as described above) in combination with appropriate software and / or firmware.

Claims

1. A control method, applied to an air source heat pump unit, characterized in that: The air source heat pump unit includes a water receiving pan and an electric heating device for heating the water receiving pan, and the control method includes: Determining whether the electric heating device is abnormal; Based on the abnormality of the electric heating device, the air source heat pump unit is controlled to issue a reminder message.

2. The control method according to claim 1, characterized in that: The determining whether the electric heating device is abnormal includes: Before starting the compressor of the air source heat pump unit, it is determined whether the electric heating device is abnormally started.

3. The control method according to claim 2, characterized in that: The determining whether the electric heating device is abnormally turned on includes: determining whether the electric heating device is abnormally turned on according to the current ambient temperature and the current standby power of the air source heat pump unit.

4. The control method according to claim 3, characterized in that: The determining whether the electric heating device is abnormally turned on according to the current ambient temperature and the current standby power of the air source heat pump unit comprises: Determine a first set temperature range according to the current ambient temperature; Determining a corresponding first set standby power range according to the first set temperature interval in which the current ambient temperature is located; Based on the current standby power of the air source heat pump unit being within the corresponding first set standby power range, determining that the electric heating device is abnormally turned on; There are multiple first set temperature intervals, and each first set temperature interval corresponds to a first set standby power range.

5. The control method according to any one of claims 1 to 4, characterized in that: The control method further comprises: in response to a shutdown instruction, based on the current ambient temperature being in a third temperature range, controlling the compressor of the air source heat pump unit to shut down, and controlling the electric heating device to delay shutting down after the compressor shuts down; The determining whether the electric heating device is abnormal includes: determining whether the electric heating device is abnormally shut down based on the compressor being shut down and the electric heating device being in a delayed shut down process.

6. The control method according to claim 5, characterized in that: The determining whether the electric heating device is abnormally shut down includes: determining whether the electric heating device is abnormally shut down according to the current ambient temperature and the current standby power of the air source heat pump unit.

7. The control method according to claim 6, characterized in that: The step of judging whether the electric heating device is abnormally shut down according to the current ambient temperature and the current standby power of the air source heat pump unit comprises: Determining a corresponding second set standby power range according to a third temperature interval in which the current ambient temperature is located; Based on the fact that the current standby power of the air source heat pump unit is lower than the corresponding second set standby power range, it is determined that the electric heating device is abnormally shut down.

8. The control method according to claim 5, characterized in that: The controlling the electric heating device to delay turning off after the compressor stops, comprises: controlling the electric heating device to delay turning off for a first set time length ts1 after the compressor stops; The method of judging whether the electric heating device is abnormally shut down based on the fact that the compressor is shut down and the electric heating device is in the process of delayed shut down includes: judging whether the electric heating device is abnormally shut down within the time period from △t1 to ts1-△t2 after the compressor is shut down; wherein, △t1 is the second set time length, △t2 is the third set time length, 0≤△t1<ts1, 0<△t2<ts1.

9. The control method according to any one of claims 1 to 4, characterized in that: Also includes: In response to a power-on instruction, obtaining a current ambient temperature; Determining a control strategy for the electric heating device according to the current ambient temperature; The electric heating device is controlled according to the control strategy.

10. The control method according to claim 9, characterized in that: The step of determining the control strategy of the electric heating device according to the current ambient temperature includes: Determining a second set temperature interval according to the current ambient temperature; Determining the control strategy according to the second set temperature interval in which the current ambient temperature is located; There are multiple second set temperature intervals, and each second set temperature interval corresponds to one control strategy.

11. The control method according to claim 10, characterized in that: The plurality of second set temperature intervals include a first temperature interval, a second temperature interval and a third temperature interval, the temperature of the first temperature interval is greater than the temperature of the second temperature interval, and the temperature of the second temperature interval is greater than the temperature of the third temperature interval; The control strategy corresponding to the first temperature interval includes: controlling the electric heating device to maintain a normally closed state; The control strategy corresponding to the second temperature interval includes: controlling the electric heating device to be turned on at least during a part of the defrosting process; The control strategy corresponding to the third temperature interval includes: controlling the electric heating device to remain in a normally open state.

12. The control method according to claim 11, characterized in that: The second temperature interval includes a plurality of sub-temperature intervals, and different sub-temperature intervals correspond to different sub-control strategies; In different sub-control strategies, the start-up timing and / or the shut-down timing of the electric heating device are different, and the start-up time of the electric heating device decreases as the temperature values ​​of the different sub-temperature intervals increase.

13. The control method according to claim 11, characterized in that: The control method further comprises: Based on the current ambient temperature being in the first temperature range, a shutdown instruction is received, controlling the air source heat pump unit to shut down; Based on the current ambient temperature being in the second temperature range, a shutdown instruction is received, controlling the air source heat pump unit to shut down; Based on the fact that the current ambient temperature is within the third temperature range, a shutdown command is received, the compressor of the air source heat pump unit is controlled to shut down, and the electric heating device is controlled to delay shutting down after the compressor is shut down.

14. A control device, characterized in that: The system comprises a processor and a memory storing a computer program, wherein when the processor executes the computer program, the steps of the control method according to any one of claims 1 to 13 are implemented.

15. An air source heat pump unit, characterized in that: Comprising a control device as claimed in claim 14.

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