CN112033039B - Heat exchanger self-cleaning method and heat pump unit - Google Patents
Heat exchanger self-cleaning method and heat pump unit Download PDFInfo
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- CN112033039B CN112033039B CN202010930521.2A CN202010930521A CN112033039B CN 112033039 B CN112033039 B CN 112033039B CN 202010930521 A CN202010930521 A CN 202010930521A CN 112033039 B CN112033039 B CN 112033039B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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Abstract
The invention discloses a heat exchanger self-cleaning method and a heat pump unit, wherein the heat exchanger self-cleaning method comprises the following steps: judging whether to enter a cleaning mode; reducing the amount of refrigerants participating in working circulation in a unit where the heat exchanger to be cleaned is located, and enabling the heat exchanger to be cleaned to be frosted; detecting frosting operation parameters of the unit, and judging whether the frosting operation parameters meet the defrosting condition; and if so, the unit is operated in a defrosting mode, the unit is taken out of the cleaning mode after defrosting is finished, and the refrigerant quantity participating in the working cycle in the unit is recovered in the defrosting operation process or when the unit is taken out of the cleaning mode. The invention forces the heat exchanger to be cleaned to frost by reducing the amount of refrigerants participating in work in the unit, and then defrosts after the frost is finished, so as to take away dirt on the heat exchanger to be cleaned.
Description
Technical Field
The invention relates to the technical field of heat pumps, in particular to a heat exchanger self-cleaning method and a heat pump unit.
Background
After the outdoor unit of the heat pump unit operates for a period of time, the fins are obviously full of dust and dirt, the performance of the heat pump unit is seriously affected, manual cleaning is difficult, and the operation possibility is low. The existing self-cleaning technology usually adopts a rapid refrigerating/heating mode, and changes the frequency of a compressor or the rotating speed of a fan and reduces the evaporation pressure to frost an outdoor heat exchanger in terms of working principle. However, this method is only suitable for frequency converter set, and cannot be used in fixed frequency set.
The water heater, the fixed-frequency unit and the fixed-frequency capillary unit in the current market still occupy the leading position, and the existing cleaning mode of quick refrigeration/heating is not suitable for use.
Therefore, how to design a self-cleaning method of heat exchangers suitable for different units is an urgent technical problem to be solved in the industry.
Disclosure of Invention
In order to overcome the defect that the application range of the existing self-cleaning mode is small, the invention provides the heat exchanger self-cleaning method and the heat pump unit.
The invention adopts the technical scheme that the self-cleaning method of the heat exchanger is designed, and comprises the following steps:
judging whether to enter a cleaning mode;
reducing the amount of refrigerants participating in working circulation in a unit where the heat exchanger to be cleaned is located, and enabling the heat exchanger to be cleaned to be frosted;
detecting frosting operation parameters of the unit, and judging whether the frosting operation parameters meet the defrosting condition;
and if so, the unit is operated in a defrosting mode, the unit is taken out of the cleaning mode after defrosting is finished, and the refrigerant quantity participating in the working cycle in the unit is recovered in the defrosting operation process or when the unit is taken out of the cleaning mode.
Wherein, reduce and treat that to participate in duty cycle's refrigerant volume in the unit of clean heat exchanger place includes: the refrigerant in the unit is divided into two parts, wherein one part of the refrigerant participates in the working cycle of the unit, and the other part of the refrigerant is blocked outside the working cycle of the unit; the refrigerant quantity participating in the working cycle in the recovery unit comprises the following steps: the two parts of refrigerants are converged to participate in the working cycle of the unit together.
Preferably, an opening-adjustable throttling component is arranged on the refrigerant inlet side of the heat exchanger to be cleaned, and after the heat exchanger enters a cleaning mode, the opening of the throttling component is adjusted to a minimum limit value; when the unit defrosting operation is carried out, the opening degree of the throttling component is adjusted to the preset defrosting opening degree.
Preferably, after entering the cleaning mode, the fan of the heat exchanger to be cleaned is kept off.
Preferably, the condensation side of the unit is connected with a water tank, and water and a refrigerant are stored in the water tank after heat exchange. Determining whether to enter the cleaning mode further comprises: detecting the conventional operation parameters of the unit, judging whether the conventional operation parameters meet the self-cleaning condition, and if so, entering a cleaning mode.
Preferably, when the conventional operation parameters meet the self-cleaning condition, the actual water temperature of the water tank is detected, whether the actual water temperature is lower than the preset water temperature or not is judged, if yes, the cleaning mode is entered, and if not, the actual water temperature of the water tank is continuously detected.
Preferably, when the conventional operation parameters meet the self-cleaning condition, the real-time of the unit is detected, whether the real-time is in a non-user water consumption time period or not is judged, if yes, the cleaning mode is entered, and otherwise, the real-time of the unit is continuously detected.
In one embodiment, the normal operating parameters include a number of heating timeouts, and the self-cleaning conditions include: the heating overtime times reach or exceed the preset overtime times. The detection mode of the heating overtime times comprises the following steps: recording the actual heating time for heating the actual water temperature of the water tank to the target water temperature and the actual environment temperature during heating by the unit each time, acquiring corresponding standard heating time from a preset temperature time comparison table according to the actual environment temperature, and accumulating the heating overtime times once if the actual heating time deviates from the standard heating time. The heating timeout times are cleared when exiting the cleaning mode.
In another embodiment, the normal operating parameters include accumulated unclean time of the unit, and the self-cleaning conditions include: the accumulated uncleaned time reaches or exceeds a preset uncleaned time. The accumulated uncleaned time is cleared and re-timed when exiting the cleaning mode.
In yet another embodiment, determining whether to enter the cleaning mode further comprises: and judging whether a manually input self-cleaning instruction is received or not, and if so, entering a cleaning mode.
The invention also provides a heat pump unit, comprising: the self-cleaning system comprises a compressor, an outdoor heat exchanger, an indoor heat exchanger, a throttling component and a control main board, wherein the control main board executes the self-cleaning method of the heat exchanger.
When the heat exchanger to be cleaned is an outdoor heat exchanger, the following two structures are used to implement the self-cleaning method.
The first type is that a refrigerant inlet, a first refrigerant outlet and a second refrigerant outlet are sequentially arranged on a refrigerant heat exchange tube of an indoor heat exchanger along the refrigerant flowing direction, the second refrigerant outlet is located below the first refrigerant outlet, the first refrigerant outlet and the second refrigerant outlet are connected with the outdoor heat exchanger through throttling components, and the first refrigerant outlet and the second refrigerant outlet are respectively provided with a switch valve connected with a control main board.
And secondly, a refrigerant inlet and a refrigerant outlet are sequentially arranged on a refrigerant heat exchange tube of the indoor heat exchanger along the refrigerant flowing direction, a first branch and a second branch are parallelly connected with the refrigerant outlet, the first branch is connected with the outdoor heat exchanger through a throttling part, the second branch is connected with a liquid storage device, and a liquid storage valve and/or a liquid storage pump connected with the control main board are/is arranged on the second branch.
Compared with the prior art, the invention reduces the refrigerant quantity participating in the working cycle of the unit after entering the cleaning mode, enhances the throttling, enables the temperature of the throttled refrigerant to be too low, enables the heat exchanger to be cleaned to frost even under the condition of high environmental temperature, and then defrosts to take away the dirt on the heat exchanger to be cleaned, thereby achieving the effect of cleaning the heat exchanger. The self-cleaning method of the invention has less added parts to the unit, does not cause the unit cost to be greatly increased, has high practicability and is beneficial to popularization and application.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a schematic view of a first refrigerant storage structure according to the present invention;
FIG. 2 is a schematic view of a second refrigerant storage structure according to the present invention;
FIG. 3 is a schematic diagram illustrating a self-cleaning process of a first refrigerant storage structure according to the present invention;
fig. 4 is a schematic diagram of a self-cleaning process of a second refrigerant storage structure according to the present invention.
Detailed Description
As shown in fig. 1 and 2, the heat exchanger self-cleaning method provided by the invention is suitable for different units, the unit comprises a compressor 1, an outdoor heat exchanger 2, an indoor heat exchanger 3, a throttling component 4, a four-way valve 5 and a control main board, and as the outdoor heat exchanger 2 is in an external environment and dust and dirt accumulated on fins are more, the control main board can automatically clean the outdoor heat exchanger by executing the self-cleaning method, so that the unit can keep a good running state for a long time.
For convenience of understanding, a heat pump unit is taken as an example for illustration, the heat exchanger to be cleaned is an outdoor heat exchanger 2, a condensation side of the unit is connected with a water tank, water is stored in the water tank after being subjected to heat exchange with a high-temperature refrigerant on the condensation side of the unit through the heat exchanger, the water tank usually adopts a heat preservation water tank, and hot water in the water tank can be used by a user.
As shown in fig. 3 and 4, the self-cleaning method of the heat exchanger comprises the following steps:
first, whether to enter a cleaning mode is judged.
There are two ways to enter the cleaning mode, the first is to automatically detect the entry into the cleaning mode, and the second is to manually force the entry into the cleaning mode.
The specific content of automatically detecting the entering of the cleaning mode is as follows, detecting the conventional operation parameters of the unit, judging whether the conventional operation parameters meet the self-cleaning condition, and if so, entering the cleaning mode.
In one embodiment, the regular operation parameter includes a heating timeout number, and the self-cleaning condition includes: the heating overtime times reach or exceed the preset overtime times. Wherein, the detection mode of the heating overtime times is to record the actual heating time for each time the unit heats the actual water temperature of the water tank to the target water temperature and the actual environment temperature during heating, obtain the corresponding standard heating time from the preset temperature time comparison table according to the actual environment temperature, the temperature time comparison table is the comparison table of the environment temperature interval and the standard heating time, divide the environment temperature into a plurality of different continuous intervals, obtain the standard heating time corresponding to each environment temperature interval in the normal state of the unit through a plurality of experiments, the standard heating time is a time range, namely the actual heating time accords with the standard heating time from the temperature time comparison table according to the actual environment temperature, if the actual heating time is in the time range of the standard heating time, the actual heating time is consistent with the standard heating time, and the heating overtime times are not changed, and if the actual heating time exceeds the time range of the standard heating time, the actual heating time deviates from the standard heating time, and the heating overtime times are accumulated once. When the heating overtime times reach or exceed the preset overtime times, the conventional operation parameters are judged to meet the self-cleaning condition, and the preset overtime times can be set according to the actual conditions, such as 5 times. It should be noted that the heating timeout times are cleared when the cleaning mode exits, and the unit performs automatic detection of the next cleaning mode.
In another embodiment, the normal operating parameters include accumulated unclean time of the unit, and the self-cleaning conditions include: the accumulated uncleaned time reaches or exceeds the preset uncleaned time, and the accumulated uncleaned time comprises the running or non-running time of the unit. When the accumulated uncleaned time reaches or exceeds the preset uncleaned time, the conventional operation parameters are judged to meet the self-cleaning condition, and the preset uncleaned time can be set according to the actual situation, such as 30 days. It should be noted that, when the accumulated uncleaned time exits the cleaning mode, the accumulated uncleaned time is cleared and re-timed, and the unit performs automatic detection of the next cleaning mode.
The automatic detection modes in the above two embodiments can be selected simultaneously or only one of them can be selected.
Preferably, in order to optimize the frosting effect after entering the cleaning mode, when the conventional operation parameters meet the self-cleaning condition, the actual water temperature of the water tank is detected, whether the actual water temperature is lower than the preset water temperature or not is judged, if yes, the cleaning mode is entered, and otherwise, the actual water temperature of the water tank is continuously detected. The reason is that after entering the cleaning mode, the refrigerant quantity is reduced, meanwhile, the throttling is enhanced, the pressure ratio of the compressor is increased, so that the exhaust temperature is possibly too high, meanwhile, the refrigerant circulation quantity is reduced when the water temperature is high, the cold absorption quantity of the evaporator is reduced, the frosting rate is reduced to some extent, and the frosting effect is poor.
Further, in order to guarantee the use experience of a user, when the conventional operation parameters meet the self-cleaning condition, the real-time of the unit is detected, whether the real-time is in a non-user water consumption time period or not is judged, if yes, the cleaning mode is started, otherwise, the real-time of the unit is continuously detected, and the real-time is the current local time of the unit, such as 1 pm and 11 pm.
In a preferred embodiment, when the normal operation parameters meet the self-cleaning condition, the unit can enter the cleaning mode only when the actual water temperature is lower than the preset water temperature and the real-time is in the non-user water consumption time period.
The specific content of manually and forcibly entering the cleaning mode is that whether a manually input self-cleaning instruction is received or not is judged, if yes, the cleaning mode is entered, a user can manually input the self-cleaning instruction according to the actual condition, and under the condition, the unit does not detect the conventional operation parameters, and immediately enters the cleaning mode after receiving the self-cleaning instruction.
And secondly, entering a cleaning mode.
The method comprises the steps of executing a frosting action, reducing the amount of refrigerants participating in working circulation in a unit where a heat exchanger to be cleaned is located, and particularly dividing the refrigerants in the unit into two parts, wherein one part of the refrigerants participate in the working circulation of the unit, and the other part of the refrigerants are blocked outside the working circulation of the unit. When the refrigerant inlet side of the heat exchanger to be cleaned is provided with an opening-adjustable throttling component 4 (such as an electronic expansion valve), after the cleaning mode is entered, the fan of the heat exchanger to be cleaned is kept closed, and the opening of the electronic expansion valve is adjusted to a minimum limit value. When the refrigerant inlet side of the heat exchanger to be cleaned is provided with a throttling component (such as a capillary tube) with non-adjustable opening degree, after the heat exchanger to be cleaned enters a cleaning mode, the fan of the heat exchanger to be cleaned is kept closed.
The unit is operated in a frosting mode after being started, the heat exchanger to be cleaned is used as an evaporator to participate in the working cycle of the unit, the frosting action is used for manufacturing a refrigerant-deficient state, and the refrigerant-deficient state and the over throttling mode are utilized to enable the heat exchanger to be cleaned to be frosted.
And thirdly, detecting the frosting operation parameters of the unit and judging whether the frosting operation parameters meet the defrosting conditions.
The defrosting condition has multiple choices, such as setting the frosting time, detecting the frosting operation time of the unit, starting to time the frosting operation time when the unit enters a cleaning mode and is started to operate, and judging that the frosting operation parameter meets the defrosting condition when the frosting operation time reaches the set frosting time. For example, the defrosting temperature is set, a temperature sensing device is installed on the refrigerant outlet side of the heat exchanger to be cleaned, the temperature of the refrigerant outlet side of the heat exchanger to be cleaned is detected, and when the temperature is reduced to the set defrosting temperature, the frosting operation parameter is judged to meet the defrosting condition.
And fourthly, the unit is operated in a defrosting mode, and the cleaning mode is taken out after the defrosting is finished.
The unit is operated in a defrosting mode, the heat exchanger to be cleaned is used as a condenser to participate in the working cycle of the unit, and the frost layer is melted to take away and remove dirt on the fins. The detection and judgment of the defrosting completion can use any one of the exiting defrosting conditions in the prior art, which is similar to the principle of entering the defrosting condition, such as setting the defrosting time, when the unit defrosting is operated to the set defrosting time, the defrosting is completed, the defrosting operation is exited, and then the cleaning mode is exited. Or setting the exit temperature, finishing defrosting when the temperature of the refrigerant outlet side of the heat exchanger to be cleaned rises to the set exit temperature, exiting defrosting operation, and then exiting the cleaning mode.
It should be noted that, in order to ensure that the unit can normally operate after exiting from the cleaning mode, during the defrosting operation or exiting from the cleaning mode, the amount of the refrigerant participating in the working cycle in the unit is recovered, and the refrigerant separated into two parts in the frosting action is re-converged to participate in the working cycle of the unit together. Meanwhile, in order to avoid that the unit can be stably switched from frosting operation to defrosting operation, the amount of the refrigerant participating in the working cycle in the unit can be recovered when the unit exits from the cleaning mode.
Furthermore, the invention provides two structures capable of implementing the self-cleaning method, the invention includes but is not limited to the following two implementation structures, and other refrigerant storage structures capable of implementing the self-cleaning method can be adopted in practical application.
As shown in fig. 1, in the first structure, a refrigerant inlet, a first refrigerant outlet and a second refrigerant outlet are sequentially arranged on a refrigerant heat exchange tube of the indoor heat exchanger 3 along a refrigerant flowing direction, the refrigerant flowing direction is from top to bottom, the second refrigerant outlet is located below the first refrigerant outlet, the first refrigerant outlet and the second refrigerant outlet are connected to the throttling component 4 in parallel and connected with the outdoor heat exchanger 2 through the throttling component 4, the first refrigerant outlet is provided with a switch valve a6 for switching on/off states of the first refrigerant outlet, the second refrigerant outlet is provided with a switch valve B7 for switching on/off states of the second refrigerant outlet, and opening or closing of the switch valve a6 and the switch valve B7 is controlled by a control main board. When the control main board opens the switch valve a6 and closes the switch valve B7, the heat exchange tube section between the first refrigerant outlet and the second refrigerant outlet does not participate in the working cycle of the unit, that is, the refrigerant at the lower part of the indoor heat exchanger 3 does not participate in the working cycle of the unit. When the main board is controlled to close the switch valve A6 and open the switch valve B7, the whole heat exchange tube participates in the working cycle of the unit, that is, all the refrigerants of the indoor heat exchanger 3 participate in the working cycle of the unit.
As shown in fig. 3, the self-cleaning method of the first structure has the following flow:
s1.1, judging whether to enter a cleaning mode, and if self-cleaning conditions are met, and the actual water temperature is lower than the preset water temperature and the real-time is in a non-user water consumption time period, entering S1.2;
step S1.2, entering a cleaning mode;
s1.3, executing a frosting action, opening a switch valve A6, closing a switch valve B7, enabling a throttling component 4 to reach the minimum value, and keeping a fan of the outdoor heat exchanger 2 stopped;
s1.4, starting the unit, running the unit in a frosting mode, and frosting the outdoor heat exchanger 2;
s1.5, judging whether defrosting conditions are met, and if yes, entering S1.6;
s1.6, the unit is operated in a defrosting mode, and the throttling component 4 is adjusted to a preset defrosting opening degree;
step S1.7, judging whether the defrosting exiting condition is met, and if yes, entering step S1.8;
s1.8, quitting defrosting operation;
and S1.9, exiting the cleaning mode, closing the switch valve A6, opening the switch valve B7 and shutting down the unit. Of course, the on-off valve a6 may be closed and the on-off valve B7 may be opened during the unit defrosting operation, which is not limited by the present invention.
As shown in fig. 2, in the second structure, a refrigerant inlet and a refrigerant outlet are sequentially arranged on a refrigerant heat exchange tube of the indoor heat exchanger 3 along a refrigerant flowing direction, a first branch and a second branch are connected in parallel to the refrigerant outlet, the first branch is connected with the outdoor heat exchanger 2 through a throttling component, the second branch is connected with a liquid reservoir 8, a liquid storage valve 9 is arranged on the second branch, and the opening or closing of the liquid storage valve 9 is controlled by a control main board. When the liquid storage valve 9 is opened, a part of refrigerant in the unit flows into the liquid storage device 8, the liquid storage valve 9 is opened for a period of time (such as 5 min) and then closed, the opening time of the liquid storage valve 9 can be obtained according to multiple experiments, the refrigerant stored in the liquid storage device 8 after the liquid storage valve 9 is closed does not participate in the working cycle of the unit, and when the liquid storage valve 9 is opened again, the refrigerant in the liquid storage device 8 is released to be converged with the refrigerant in the unit and participate in the working cycle together. The second structure can be more that the refrigerant is stored for first structure, and the frosting effect is better, but has the refrigerant residue in the reservoir 8, can't release completely.
For optimizing the second structure, the liquid storage valve 9 can be replaced by a liquid storage pump, or a liquid storage pump is added on the second branch, the working state of the liquid storage pump is also controlled by the control main board, the refrigerant is pumped into or out of the liquid storage device 8 through the liquid storage pump, and the refrigerant in the liquid storage device 8 can be completely released into the working cycle of the unit.
As shown in fig. 4, the self-cleaning method of the second structure has the following flow:
s1.1, judging whether to enter a cleaning mode, and if self-cleaning conditions are met, and the actual water temperature is lower than the preset water temperature and the real-time is in a non-user water consumption time period, entering S1.2;
step S1.2, entering a cleaning mode;
s1.3, executing a frosting action, opening a liquid storage valve 9, enabling a throttling component 4 to reach a minimum value, and keeping a fan of the outdoor heat exchanger 2 stopped;
s1.4, starting the unit, running in a frosting mode, opening a liquid storage valve 9 for a certain time, then closing the liquid storage valve, and frosting an outdoor heat exchanger 2;
s1.5, judging whether defrosting conditions are met, and if yes, entering S1.6;
s1.6, carrying out defrosting operation on the unit, adjusting the throttle part 4 to a preset defrosting opening degree, and opening the liquid storage valve 9 to release a refrigerant;
step S1.7, judging whether the defrosting exiting condition is met, and if yes, entering step S1.8;
s1.8, closing the liquid storage valve 9 and exiting defrosting operation;
and S1.9, exiting the cleaning mode and shutting down the unit. Of course, the liquid storage valve 9 may be opened to release the refrigerant when the cleaning mode is exited, the liquid storage valve 9 is opened for a certain time and then closed, and the unit is shut down after the liquid storage valve 9 is closed. The liquid storage valve 9 may be opened for a certain time in step S1.6 and then closed as long as the refrigerant can be sufficiently discharged. Or, the liquid storage valve 9 in the self-cleaning method is replaced by a liquid storage pump, the liquid storage pump is controlled to pump the refrigerant into the liquid storage device in step S1.4, the liquid storage pump is controlled to pump the refrigerant out of the liquid storage device 8 in step S1.6, or the liquid storage pump is controlled to pump the refrigerant out of the liquid storage device 8 when the cleaning mode is exited, and the unit is shut down again.
During normal operation of the unit, the switch valve a6 in the first configuration remains closed, the switch valve B7 remains open, and the reservoir valve 9 or reservoir pump in the second configuration remains closed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (12)
1. The self-cleaning method of the heat exchanger is characterized in that a water tank is connected to the condensation side of the unit, water and a refrigerant exchange heat and then are stored in the water tank, and the self-cleaning method of the heat exchanger comprises the following steps:
judging whether to enter a cleaning mode;
if so, reducing the amount of refrigerants participating in working circulation in a unit where the heat exchanger to be cleaned is located, and frosting the heat exchanger to be cleaned;
detecting frosting operation parameters of the unit, and judging whether the frosting operation parameters meet the defrosting condition;
if yes, the unit operates in a defrosting mode, and the unit exits the cleaning mode after defrosting is completed;
wherein the determining whether to enter the cleaning mode includes: detecting conventional operation parameters of the unit, judging whether the conventional operation parameters meet self-cleaning conditions, and if so, entering a cleaning mode;
the normal operation parameters comprise heating timeout times, and the self-cleaning conditions comprise: the heating overtime times reach or exceed preset overtime times, and the detection mode of the heating overtime times comprises the following steps: recording actual heating time for heating the actual water temperature of the water tank to a target water temperature and actual environment temperature during heating by the unit each time, acquiring corresponding standard heating time from a preset temperature time comparison table according to the actual environment temperature, and accumulating the heating overtime times once if the actual heating time deviates from the standard heating time; and clearing the heating overtime times when the cleaning mode is exited.
2. The self-cleaning method of the heat exchanger as claimed in claim 1, wherein the refrigerant quantity of the unit participating in the working cycle is recovered during defrosting operation or when the cleaning mode is exited.
3. The method of claim 2, wherein the reducing the amount of refrigerant participating in the working cycle in the unit in which the heat exchanger to be cleaned is located comprises: dividing the refrigerant in the unit into two parts, wherein one part of the refrigerant participates in the working cycle of the unit, and the other part of the refrigerant is blocked outside the working cycle of the unit;
the refrigerant quantity participating in the working cycle in the recovery unit comprises: the two parts of refrigerants are converged and participate in the working cycle of the unit together.
4. The self-cleaning method of the heat exchanger as claimed in claim 1, wherein an opening-adjustable throttle member is provided on a refrigerant inlet side of the heat exchanger to be cleaned; after the unit enters the cleaning mode, the opening degree of the throttling component is adjusted to a minimum limit value, and when the unit operates in a defrosting mode, the opening degree of the throttling component is adjusted to a preset defrosting opening degree.
5. The method of claim 1, wherein the fan of the heat exchanger to be cleaned remains off after entering the cleaning mode.
6. The heat exchanger self-cleaning method as claimed in claim 1, wherein the normal operation parameters include accumulated unclean time of the unit, and the self-cleaning conditions include: the accumulated uncleaned time reaches or exceeds a preset uncleaned time; the accumulated unclean time is cleared and re-timed when exiting the cleaning mode.
7. The self-cleaning method of the heat exchanger as claimed in claim 1 or 6, wherein when the normal operation parameter satisfies the self-cleaning condition, the actual water temperature of the water tank is detected, whether the actual water temperature is lower than a preset water temperature is judged, if yes, the cleaning mode is entered, otherwise, the actual water temperature of the water tank is continuously detected.
8. The heat exchanger self-cleaning method according to claim 1 or 6, wherein when the normal operation parameters meet the self-cleaning condition, the real-time of the unit is detected, whether the real-time is in a non-user water consumption time period is judged, if yes, the cleaning mode is entered, and otherwise, the real-time of the unit is continuously detected.
9. The method of claim 1, wherein the determining whether to enter a cleaning mode further comprises: and judging whether a manually input self-cleaning instruction is received, and if so, entering the cleaning mode.
10. A heat pump unit comprising: compressor, outdoor heat exchanger, indoor heat exchanger, throttle part and control mainboard, characterized in that, the heat exchanger self-cleaning method of any one of claims 1 to 9 is carried out to the control mainboard.
11. The heat pump unit according to claim 10, wherein the refrigerant heat exchange tube of the indoor heat exchanger is sequentially provided with a refrigerant inlet, a first refrigerant outlet, and a second refrigerant outlet located below the first refrigerant outlet, the first refrigerant outlet and the second refrigerant outlet are connected with the outdoor heat exchanger through the throttling component, and the first refrigerant outlet and the second refrigerant outlet are both provided with a switch valve connected with the control main board.
12. The heat pump unit according to claim 10, wherein the refrigerant heat exchange tube of the indoor heat exchanger is provided with a refrigerant inlet and a refrigerant outlet, the refrigerant outlet is provided with a first branch and a second branch in parallel, the first branch is connected with the outdoor heat exchanger through the throttling component, the second branch is connected with a liquid reservoir, and the second branch is provided with a liquid storage valve and/or a liquid storage pump connected with the control main board.
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| CN202010930521.2A CN112033039B (en) | 2020-09-07 | 2020-09-07 | Heat exchanger self-cleaning method and heat pump unit |
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| CN202010930521.2A CN112033039B (en) | 2020-09-07 | 2020-09-07 | Heat exchanger self-cleaning method and heat pump unit |
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| JP5691000B2 (en) * | 2011-06-09 | 2015-04-01 | パナソニックＩｐマネジメント株式会社 | Air conditioner |
| KR101712471B1 (en) * | 2015-04-27 | 2017-03-22 | 주식회사 삼성그린택 | Heat pump of solar powered defrosting |
| CN106642540A (en) * | 2016-11-11 | 2017-05-10 | 青岛海尔空调器有限总公司 | Air-conditioning heat exchanger self-cleaning method |
| CN106766299A (en) * | 2016-12-29 | 2017-05-31 | 青岛海尔股份有限公司 | The control method of refrigerating plant, the refrigerator with the refrigerating plant and refrigerator |
| CN106679111B (en) * | 2017-01-23 | 2020-04-14 | 深圳创维空调科技有限公司 | Automatic cleaning treatment method and system for heat exchanger of air conditioner |
| CN106871477A (en) * | 2017-03-13 | 2017-06-20 | 合肥美的暖通设备有限公司 | Defroster, source pump and its Defrost method |
| CN107023954A (en) * | 2017-04-10 | 2017-08-08 | 青岛海尔空调器有限总公司 | A kind of air conditioner and cleaning control method |
| CN107525209A (en) * | 2017-07-13 | 2017-12-29 | 青岛海尔空调器有限总公司 | Air conditioner automatically cleaning control method and device |
| CN107514683B (en) * | 2017-07-31 | 2020-11-03 | 青岛海尔空调器有限总公司 | Air conditioner and indoor unit self-cleaning control method thereof |
| CN109489189B (en) * | 2017-09-08 | 2020-10-23 | 奥克斯空调股份有限公司 | Cleaning method of air conditioner |
| CN107975991A (en) * | 2017-11-21 | 2018-05-01 | 珠海格力电器股份有限公司 | Dedusting control method and air-conditioning system |
| CN118129501A (en) * | 2018-04-09 | 2024-06-04 | 株式会社电装 | Heat Exchanger |
| CN108954505B (en) * | 2018-05-24 | 2020-09-29 | 广东美的制冷设备有限公司 | Air conditioner |
| CN108844178B (en) * | 2018-06-19 | 2020-11-24 | 珠海格力电器股份有限公司 | Air conditioner self-cleaning control method and device |
| CN110762881A (en) * | 2018-07-28 | 2020-02-07 | 青岛海尔空调器有限总公司 | Self-cleaning control method for air conditioner |
| CN110966726A (en) * | 2018-09-30 | 2020-04-07 | 青岛海尔空调器有限总公司 | Control method and device for air conditioning system, computer equipment and storage medium |
| CN110260451A (en) * | 2019-05-22 | 2019-09-20 | 珠海格力电器股份有限公司 | The method of the method and air-conditioner defrosting of air-conditioner defrosting dedusting |
| CN211204223U (en) * | 2019-11-27 | 2020-08-07 | 广东海悟科技有限公司 | Variable frequency air conditioning system |
| CN111854044A (en) * | 2020-07-24 | 2020-10-30 | 广东美的暖通设备有限公司 | Self-cleaning method and device of air conditioner, air conditioner and electronic equipment |
| CN112161416A (en) * | 2020-09-24 | 2021-01-01 | 王安 | Heat pump heat exchanger and heat pump using same |
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