CN112484347A - Four-way valve reversing control method and device, air-conditioning heat pump unit and controller - Google Patents
Four-way valve reversing control method and device, air-conditioning heat pump unit and controller Download PDFInfo
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- CN112484347A CN112484347A CN202011264932.9A CN202011264932A CN112484347A CN 112484347 A CN112484347 A CN 112484347A CN 202011264932 A CN202011264932 A CN 202011264932A CN 112484347 A CN112484347 A CN 112484347A
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- way valve
- temperature
- reversing
- frequency
- control method
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
- F24F11/67—Switching between heating and cooling modes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2106—Temperatures of fresh outdoor air
Abstract
The invention relates to a four-way valve reversing control method, a four-way valve reversing control device, an air-conditioning heat pump unit and a controller, wherein the four-way valve reversing control method comprises the following steps: collecting outdoor temperature and indoor inner machine pipe temperature; judging whether the unit enters low-temperature heating starting or not according to the outdoor temperature; when the unit is started in a low-temperature heating mode, the four-way valve reversing frequency is set according to the outdoor temperature and the indoor side inner unit pipe temperature, and the four-way valve is controlled to reverse. According to the invention, by detecting the outdoor temperature and setting different four-way valve reversing frequencies under different outer ring conditions, high-low pressure difference can be quickly established after the unit operates, and reversing is realized; meanwhile, for the condition that the four-way valve acts but the actual four-way valve is not successfully reversed, the reversing frequency of the four-way valve is reset and improved, and the possibility of reversing failure is reduced. The control method can realize the reliable reversing of the heating starting four-way valve under the ultralow temperature condition, and is favorable for realizing the stable operation of heating.
Description
Technical Field
The invention relates to the technical field of heating starting, in particular to a four-way valve reversing control method and device, an air-conditioning heat pump unit and a controller.
Background
The prior air-conditioning heat pump unit generally realizes the switching of the refrigeration mode and the heating mode through the reversing control of a four-way valve. However, the existing four-way valve basically controls the four-way valve through a pilot valve with an electromagnetic coil, and the four-way valve is driven to reverse through pressure difference. The four-way valve reversing logic in the existing unit is basically simple to control, and the four-way valve reversing logic is generally reversed before the compressor is started or after a fixed time when heating is performed. In this case, there may be a problem that the commutation is not successful because the solenoid of the four-way valve is operated but the actual pressure difference does not reach the commutation condition.
Patent No. CN103388945B discloses a four-way valve control method, which is characterized in that temperature detection is added at the ends of an E pipe and a C pipe of the four-way valve, and whether the four-way valve is in place in a reversing way is judged by utilizing the relationship between the temperature difference of the E pipe and the C pipe and the preset temperature difference, so that the air leakage probability of the four-way valve is reduced.
Patent No. CN104930637A discloses a through detecting whether the pressure differential of cross valve liquid accords with the requirement of cross valve switching-over, through increasing or reducing the pressure differential to the preset within range of cross valve to make air conditioning unit's refrigeration heating function switch more stable.
Patent No. CN108592464A discloses a method for controlling a four-way valve to perform reversing by detecting an exhaust temperature and an exhaust pressure and comparing a temperature difference between the exhaust temperature and a saturation temperature corresponding to the exhaust pressure with a preset optimal reversing value.
The four-way valve control schemes are many and are not listed; in summary, they all have the following disadvantages:
1) and a pressure sensor or a temperature sensing device needs to be added in the system, so that the possibility of system abnormity caused by failure of added components exists, and the material cost is increased.
2) And for the low temperature condition, because the system pressure is low, the high-low pressure difference of the system is difficult to establish, especially for the machine type of more than 5P, because of the existence of the middle flow of the four-way valve, the normal reversing can not be realized under the reversing mode of the four-way valve.
Therefore, a system high-low pressure difference can be quickly established under a low-temperature condition, the stable reversing of the four-way valve is ensured, and the problem of heating starting of the heat pump during ultralow-temperature operation is solved.
Disclosure of Invention
In view of the above, the present invention provides a four-way valve reversing control method, a four-way valve reversing control device, an air conditioning heat pump unit and a controller, which are used for overcoming the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: a four-way valve reversing control method comprises the following steps:
collecting outdoor temperature and indoor inner machine pipe temperature;
judging whether the unit enters low-temperature heating starting or not according to the outdoor temperature;
when the unit is started in a low-temperature heating mode, the four-way valve reversing frequency is set according to the outdoor temperature and the indoor side inner unit pipe temperature, and the four-way valve is controlled to reverse.
Optionally, the determining whether the unit enters the low-temperature heating start according to the outdoor temperature includes:
when the outdoor temperature is lower than the preset low-temperature heating temperature, judging that the outdoor temperature is lower, and entering low-temperature heating starting;
otherwise, entering normal startup.
Optionally, the four-way valve reversing frequency is set according to the outdoor temperature and the indoor side inner machine pipe temperature, the four-way valve is controlled to reverse, and the four-way valve reversing frequency control method comprises the following steps:
starting a compressor, and stopping an external fan;
judging a temperature interval of the current outdoor temperature;
determining the frequency of a compressor matched with the temperature interval according to the temperature interval in which the current outdoor temperature is;
setting the frequency of the compressor to be matched with the temperature interval, and keeping running for corresponding time;
controlling the four-way valve to be electrified and starting the outer fan;
judging whether the four-way valve is successfully reversed;
if the four-way valve fails to change direction, the reversing frequency of the four-way valve is reset, and the four-way valve is reversed again.
Optionally, the determining whether the four-way valve is successfully reversed includes:
judging whether the change value of the indoor side inner machine tube temperature in a specific time period is larger than the tube temperature change value when the four-way valve is successfully reversed;
if the change value of the indoor side inner machine tube temperature in a specific time period is larger than the tube temperature change value when the four-way valve is successfully reversed, the four-way valve is successfully reversed;
otherwise, the four-way valve fails to reverse.
Optionally, after the four-way valve fails to commutate, the reset four-way valve commutation frequency is higher than the four-way valve commutation frequency when the commutation fails.
Optionally, the smaller the value of the temperature interval is, the larger the frequency of the compressor matched with the temperature interval is.
Optionally, the control method further includes:
and after the reversing frequency of the four-way valve is reset for a specific number of times, if the four-way valve still fails to be reversed, the four-way valve enters a fault shutdown mode.
The invention also provides a four-way valve reversing control device, which comprises:
the temperature detection module is used for collecting the outdoor temperature and the indoor side inner machine pipe temperature;
the judging module is used for judging whether the unit enters low-temperature heating starting or not according to the outdoor temperature;
and the control module is used for setting the reversing frequency of the four-way valve according to the outdoor temperature and the temperature of the pipe of the internal measuring internal machine when the unit is started in low-temperature heating and controlling the reversing of the four-way valve.
The invention also provides an air-conditioning heat pump unit, comprising: the four-way valve reversing control device is as described above.
The invention also provides a controller for implementing the four-way valve reversing control method.
By adopting the technical scheme, the four-way valve reversing control method has the advantages that the outdoor temperature is detected, different four-way valve reversing frequencies are set under different outer ring conditions, so that high-pressure and low-pressure difference can be quickly established after the unit is operated, and reversing is realized; meanwhile, for the condition that the four-way valve acts but the actual four-way valve is not successfully reversed, the reversing frequency of the four-way valve is reset and improved, and the possibility of reversing failure is reduced. The control method can realize the reliable reversing of the heating starting four-way valve under the ultralow temperature condition, and is favorable for realizing the stable operation of heating.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart diagram provided by an embodiment of a four-way valve commutation control method of the present invention;
FIG. 2 is a schematic flow chart of an embodiment of a low temperature heating start-up;
fig. 3 is a schematic structural diagram provided by an embodiment of a four-way valve reversing control device according to the present invention.
In the figure: 1. a temperature detection module; 2. a judgment module; 3. and a control module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Fig. 1 is a schematic flow chart provided by an embodiment of a four-way valve commutation control method of the present invention.
As shown in fig. 1, the four-way valve reversing control method according to this embodiment includes:
s11: collecting outdoor temperature and indoor inner machine pipe temperature;
s12: judging whether the unit enters low-temperature heating starting or not according to the outdoor temperature;
further, the judging whether the unit enters low-temperature heating starting according to the outdoor temperature includes:
when the outdoor temperature is lower than the preset low-temperature heating temperature, judging that the outdoor temperature is lower, and entering low-temperature heating starting;
otherwise, entering normal startup.
S13: when the unit is started in a low-temperature heating mode, the four-way valve reversing frequency is set according to the outdoor temperature and the indoor side inner unit pipe temperature, and the four-way valve is controlled to reverse.
Further, according to the outdoor temperature with indoor side inner machine pipe temperature set up the cross valve switching-over frequency, control the switching-over of cross valve, include:
starting a compressor, and stopping an external fan;
judging a temperature interval of the current outdoor temperature;
determining the frequency of a compressor matched with the temperature interval according to the temperature interval in which the current outdoor temperature is;
setting the frequency of the compressor to be matched with the temperature interval, and keeping running for corresponding time;
controlling the four-way valve to be electrified and starting the outer fan;
judging whether the four-way valve is successfully reversed;
if the four-way valve fails to change direction, the reversing frequency of the four-way valve is reset, and the four-way valve is reversed again.
Further, the determining whether the four-way valve is successfully reversed includes:
judging whether the change value of the indoor side inner machine tube temperature in a specific time period is larger than the tube temperature change value when the four-way valve is successfully reversed;
if the change value of the indoor side inner machine tube temperature in a specific time period is larger than the tube temperature change value when the four-way valve is successfully reversed, the four-way valve is successfully reversed;
otherwise, the four-way valve fails to reverse.
Furthermore, after the four-way valve fails to reverse, the reversing frequency of the reset four-way valve is higher than that of the four-way valve when the reversing fails.
Further, the smaller the value of the temperature interval is, the larger the frequency of the compressor matched with the temperature interval is.
Further, the control method further includes:
and after the reversing frequency of the four-way valve is reset for a specific number of times, if the four-way valve still fails to be reversed, the four-way valve enters a fault shutdown mode.
In the embodiment, different four-way valve reversing frequencies are adopted in the low-temperature heating temperature interval in different regions, and the outdoor fan is stopped at the same time, so that the high-low pressure difference of the system is quickly increased, and the four-way valve is reversed; meanwhile, after the four-way valve acts, if the four-way valve is detected to be not successfully reversed, the reversing frequency of the four-way valve is improved, the reversing action of the four-way valve is carried out again, and the reversing success rate of the four-way valve is improved.
In practical use, as shown in fig. 2, the process of starting the low-temperature heating may include:
s201: starting a compressor, and stopping an external fan;
s202: judging whether the outdoor temperature is lower than a preset minimum temperature T3;
s203: if the outdoor temperature is less than the preset minimum temperature T3, adjusting the frequency of the compressor to the preset frequency F1, and keeping the operation for T1 time;
s204: the four-way valve is electrified, and the outer fan is started;
s205: judging whether the change value delta T of the indoor side inner machine pipe temperature in a specific time period (60 seconds) is larger than the pipe temperature change value (delta T preset value) when the four-way valve is successfully reversed;
s206: if the delta T is larger than the preset value of the delta T, the four-way valve is successfully reversed, and the low-temperature heating starting is finished;
s207: otherwise, the four-way valve fails to change direction and is stopped in a fault;
s208: if the outdoor temperature is not less than the preset minimum temperature T3, further judging whether the outdoor temperature is less than the preset minimum temperature T2;
s209: if the outdoor temperature is less than the preset minimum temperature T2, adjusting the frequency of the compressor to the preset frequency F2, and keeping the operation for T2 time;
s210: the four-way valve is electrified, and the outer fan is started;
s211: judging whether the change value delta T of the indoor side inner machine pipe temperature in a specific time period (60 seconds) is larger than the pipe temperature change value (delta T preset value) when the four-way valve is successfully reversed;
if Δ T is greater than a preset value of Δ T, perform step S206;
s212: otherwise, controlling the four-way valve to be powered off, and stopping the external fan; adjusting the frequency of the compressor to a preset frequency F1, and keeping running for t1 time; and executing steps S204-S207;
s213: if the outdoor temperature is not less than the preset minimum temperature T2, adjusting the frequency of the compressor to the preset frequency F3, and keeping the operation for T3 time;
s214: the four-way valve is electrified, and the outer fan is started;
s215: judging whether the change value delta T of the indoor side inner machine pipe temperature in a specific time period (60 seconds) is larger than the pipe temperature change value (delta T preset value) when the four-way valve is successfully reversed;
if Δ T is greater than a preset value of Δ T, perform step S206;
s216: otherwise, controlling the four-way valve to be powered off, and stopping the external fan; adjusting the frequency of the compressor to a preset frequency F2, and keeping running for t2 time; and performs steps S210-S213.
The process of the four-way valve reversing control in fig. 2 is as follows:
after the low-temperature heating process is carried out, firstly, starting a compressor, and carrying out shutdown treatment on an external fan;
low-temperature heating temperatures T2 and T3 are preset in the program, and low-temperature heating temperature intervals are divided into 3 intervals by T2 and T3, wherein T3 is less than T2; the temperature interval may actually be divided into 3 or further subdivided into more intervals;
setting different compressor reversing frequencies F1, F2 and F3 for different temperature intervals in the program, wherein F3 is more than F2 is more than F1;
when the compressor is started, the current outdoor temperature is compared with the preset lowest temperature T3, and if the outdoor temperature is less than the preset temperature T3, the compressor runs for T1 time after the frequency of the compressor is increased to the preset frequency F1; then the four-way valve is electrified, and the outer fan is started;
and after the four-way valve acts, monitoring the change condition of the temperature of the internal machine tube within 60s, if the temperature change value of the internal machine tube within 60s exceeds the tube temperature change value (namely delta T preset value) when the four-way valve is successfully reversed, successfully reversing, and ending the reversing control process of the four-way valve.
And if the temperature change value of the internal machine tube within 60s does not exceed the delta T preset value after the four-way valve acts, judging that the four-way valve fails to change the direction, and entering fault shutdown.
If the compressor is started, detecting that the outdoor temperature is greater than or equal to a preset temperature T3; comparing the outdoor temperature with a preset temperature T2, and if the outdoor temperature is less than the preset temperature T2, increasing the frequency of the compressor to a preset frequency F2 and then operating for a time T2; then the four-way valve is electrified, and the outer fan is started; simultaneously detecting the change condition of the temperature of the inner machine tube within 60 s;
if the temperature change value of the inner machine tube within 60s exceeds the delta T preset value, the reversing is successful, and the reversing control process of the four-way valve is finished;
if the temperature change value of the inner indoor unit pipe in 60s does not exceed the delta T preset value, the four-way valve is powered off, and the outer fan is stopped; then raising the frequency of the compressor to F1 for t1 time, and entering a reversing process of F1 frequency operation;
if the compressor is started, detecting that the outdoor temperature is not lower than a preset temperature T2; after the frequency of the compressor is increased to the preset frequency F3, the operation is carried out for t3 time; then the four-way valve is electrified, and the outer fan is started; simultaneously detecting the change condition of the temperature of the inner machine tube within 60 s; entering F3 frequency to run the commutation process;
if the temperature change value of the inner machine tube within 60s exceeds the delta T preset value, the reversing is successful, and the reversing control process of the four-way valve is finished;
if the temperature change value of the inner indoor unit pipe in 60s does not exceed the delta T preset value, the four-way valve is powered off, and the outer fan is stopped; the frequency of the compressor is then increased to F2 operation for t2 time, and the F2 frequency operation reversing process is entered.
In the embodiment, by detecting the outdoor temperature and setting different four-way valve reversing frequencies under different outer ring conditions, high-low pressure difference can be quickly established after the unit operates, and reversing is realized; meanwhile, for the condition that the four-way valve acts but the actual four-way valve is not successfully reversed, the reversing frequency of the four-way valve is reset and improved, and the possibility of reversing failure is reduced. The control method can realize reliable reversing of the heating starting four-way valve under the ultralow temperature condition, and is favorable for realizing stable heating operation.
Fig. 3 is a schematic structural diagram provided by an embodiment of a four-way valve reversing control device according to the present invention.
As shown in fig. 3, the four-way valve reversing control device according to this embodiment includes:
the temperature detection module 1 is used for collecting outdoor temperature and indoor side inner machine pipe temperature;
the judging module 2 is used for judging whether the unit enters low-temperature heating starting or not according to the outdoor temperature;
and the control module 3 is used for setting the reversing frequency of the four-way valve according to the outdoor temperature and the temperature of the pipe of the internal measuring internal machine when the unit is started in low-temperature heating, and controlling the reversing of the four-way valve.
The temperature detection module described in this embodiment can realize temperature acquisition by multiplexing the temperature sensing bulb in the existing air conditioner, and material cost can not be increased.
The working principle of the four-way valve reversing control device in this embodiment is the same as that of the four-way valve reversing control method described above, and details are not repeated here.
The invention also provides an air-conditioning heat pump unit, comprising: a four-way valve reversing control device as shown in figure 3.
The invention also provides a controller for executing the four-way valve reversing control method shown in the figure 1 or the figure 2.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A four-way valve reversing control method is characterized by comprising the following steps:
collecting outdoor temperature and indoor inner machine pipe temperature;
judging whether the unit enters low-temperature heating starting or not according to the outdoor temperature;
when the unit is started in a low-temperature heating mode, the four-way valve reversing frequency is set according to the outdoor temperature and the indoor side inner unit pipe temperature, and the four-way valve is controlled to reverse.
2. The four-way valve reversing control method according to claim 1, wherein the step of judging whether the unit enters low-temperature heating starting according to the outdoor temperature comprises the following steps:
when the outdoor temperature is lower than the preset low-temperature heating temperature, judging that the outdoor temperature is lower, and entering low-temperature heating starting;
otherwise, entering normal startup.
3. The four-way valve reversing control method according to claim 1, wherein the controlling of the four-way valve reversing by setting a four-way valve reversing frequency according to the outdoor temperature and the indoor-side indoor unit tube temperature comprises:
starting a compressor, and stopping an external fan;
judging a temperature interval of the current outdoor temperature;
determining the frequency of a compressor matched with the temperature interval according to the temperature interval in which the current outdoor temperature is;
setting the frequency of the compressor to be matched with the temperature interval, and keeping running for corresponding time;
controlling the four-way valve to be electrified and starting the outer fan;
judging whether the four-way valve is successfully reversed;
if the four-way valve fails to change direction, the reversing frequency of the four-way valve is reset, and the four-way valve is reversed again.
4. The four-way valve reversing control method according to claim 3, wherein the judging whether the four-way valve is successfully reversed comprises:
judging whether the change value of the indoor side inner machine tube temperature in a specific time period is larger than the tube temperature change value when the four-way valve is successfully reversed;
if the change value of the indoor side inner machine tube temperature in a specific time period is larger than the tube temperature change value when the four-way valve is successfully reversed, the four-way valve is successfully reversed;
otherwise, the four-way valve fails to reverse.
5. The four-way valve commutation control method of claim 3, wherein after a four-way valve commutation failure, the reset four-way valve commutation frequency is higher than the four-way valve commutation frequency at the time of the commutation failure.
6. The four-way valve reversing control method according to claim 3, wherein the smaller the value of the temperature interval is, the larger the frequency of the compressor matched with the temperature interval is.
7. The four-way valve commutation control method of any one of claims 1 to 6, further comprising:
and after the reversing frequency of the four-way valve is reset for a specific number of times, if the four-way valve still fails to be reversed, the four-way valve enters a fault shutdown mode.
8. The utility model provides a cross valve switching-over controlling means which characterized in that includes:
the temperature detection module is used for collecting the outdoor temperature and the indoor side inner machine pipe temperature;
the judging module is used for judging whether the unit enters low-temperature heating starting or not according to the outdoor temperature;
and the control module is used for setting the reversing frequency of the four-way valve according to the outdoor temperature and the temperature of the pipe of the internal measuring internal machine when the unit is started in low-temperature heating and controlling the reversing of the four-way valve.
9. An air conditioning heat pump unit, characterized by comprising: the four-way valve commutation control device of claim 8.
10. A controller for performing the four-way valve commutation control method of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011264932.9A CN112484347A (en) | 2020-11-12 | 2020-11-12 | Four-way valve reversing control method and device, air-conditioning heat pump unit and controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011264932.9A CN112484347A (en) | 2020-11-12 | 2020-11-12 | Four-way valve reversing control method and device, air-conditioning heat pump unit and controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112484347A true CN112484347A (en) | 2021-03-12 |
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| CN113203178A (en) * | 2021-06-01 | 2021-08-03 | 宁波奥克斯电气股份有限公司 | Air conditioner low-temperature heating starting control method, storage medium and air conditioner |
| CN113587522A (en) * | 2021-07-26 | 2021-11-02 | 珠海格力电器股份有限公司 | Control method for avoiding low-temperature heating shutdown and refrigeration system |
| CN114440408A (en) * | 2021-12-09 | 2022-05-06 | 海信（山东）空调有限公司 | Four-way valve control method and device for multi-split air conditioner and multi-split air conditioner |
| CN114543265A (en) * | 2022-01-26 | 2022-05-27 | 青岛海尔空调器有限总公司 | Method and device for self-cleaning of air conditioner, air conditioner and storage medium |
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