CN113137706A - Heat pump air conditioning unit and method for judging reversing abnormality of four-way valve of heat pump air conditioning unit - Google Patents
Heat pump air conditioning unit and method for judging reversing abnormality of four-way valve of heat pump air conditioning unit Download PDFInfo
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- CN113137706A CN113137706A CN202110272490.0A CN202110272490A CN113137706A CN 113137706 A CN113137706 A CN 113137706A CN 202110272490 A CN202110272490 A CN 202110272490A CN 113137706 A CN113137706 A CN 113137706A
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000004378 air conditioning Methods 0.000 title claims abstract description 41
- 230000005856 abnormality Effects 0.000 title claims description 9
- 239000007788 liquid Substances 0.000 claims abstract description 53
- 230000002159 abnormal effect Effects 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 238000010257 thawing Methods 0.000 claims description 2
- 239000003507 refrigerant Substances 0.000 description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 210000003437 trachea Anatomy 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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Abstract
The invention relates to the technical field of air conditioners, particularly provides a heat pump air conditioning unit and a method for judging reversing abnormity of a four-way valve of the heat pump air conditioning unit, and aims to solve the technical problem of unit failure caused by reversing abnormity. It includes: receiving a heating instruction; informing the four-way valve of reversing; obtaining the temperature of an inner air pipe and the temperature of the inner liquid pipe before starting the compressor in real time; starting the compressor; acquiring the temperature of an inner air pipe, the temperature of an inner liquid pipe, the temperature of an outer machine heat exchanger and the outdoor environment temperature after the compressor is started in real time; comparing the temperature of the inner gas pipe before starting the compressor, the temperature of the inner liquid pipe and the corresponding temperature after starting the compressor, and the magnitude relation between the temperature of the outer machine heat exchanger and the outdoor environment temperature; and judging whether the four-way valve is abnormal or not according to the comparison result. Compared with the prior art, the judging method takes the changes of the temperature of the inner air pipe and the temperature of the inner liquid pipe before and after the compressor is started and the relation change between the temperature of the outdoor heat exchanger and the outdoor environment temperature as judging conditions, so that the judging result is more accurate.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly provides a heat pump air conditioning unit and a method for judging reversing abnormality of a four-way valve of the heat pump air conditioning unit.
Background
The air-conditioning heat pump unit at least comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, a four-way valve and an expansion valve, wherein the five functional elements are communicated through a pipeline to form a refrigerant circulating loop for the refrigerant to flow circularly. The heat pump air conditioning unit can refrigerate and heat, and the conversion between the refrigeration function and the heating function is realized through the four-way valve.
The four-way valve is provided with four valve ports, wherein the four valve ports are communicated with an exhaust port of the compressor through a first valve port, communicated with one refrigerant valve port of the outdoor heat exchanger through a second valve port, communicated with one refrigerant valve port of the indoor heat exchanger through a third valve port and communicated with a suction port of the compressor through a fourth valve port. The other refrigerant valve port of the outdoor heat exchanger is communicated with the other refrigerant valve port of the indoor heat exchanger through an expansion valve. The four-way valve has two working positions: when the valve is in the first working position, the first valve port is communicated with the second valve port, and the third valve port is communicated with the fourth valve port; when the second working valve port is used, the first valve port is communicated with the third valve port, and the second valve port is communicated with the fourth valve port. The change of the flow direction of the refrigerant can be realized by switching the working position of the four-way valve, and then the heat pump air conditioning unit is controlled to switch between the refrigeration function and the heating function.
When the heat pump air conditioning unit is used for heating and starting up, the system receives an instruction to perform reversing operation by the four-way valve, and the expansion valve is opened to a certain opening degree (assuming that the total opening degree of the expansion valve is 470, the opening degree is set to be 120 when the heating start is started). If the four-way valve is abnormally reversed (namely fails), the heat pump air conditioning unit still works according to the received heating instruction, the expansion valve is throttled, the temperature of refrigerant flowing into an internal machine is lower than the ambient temperature, the air suction temperature of the compressor is extremely low, the refrigerant at the high-pressure side in the unit cannot be discharged, the pressure is higher and higher, finally the unit reports high-pressure faults, and when the reported faults exceed a certain number of times, the unit is locked and cannot work.
Therefore, what those skilled in the art need to solve is a technical problem of unit failure caused by abnormal reversing of the four-way valve in the heating mode.
Disclosure of Invention
In order to solve the problem of unit faults caused by abnormal reversing of a four-way valve in a heating mode, on one hand, the invention provides a method for judging abnormal reversing of the four-way valve of a heat pump air conditioning unit.
The method for judging the reversing abnormality of the four-way valve comprises the following steps of: receiving a heating instruction; informing the four-way valve of reversing; obtaining the temperature of an inner air pipe and the temperature of the inner liquid pipe before starting the compressor in real time; starting the compressor; acquiring the temperature of an inner air pipe, the temperature of an inner liquid pipe, the temperature of an outer machine heat exchanger and the outdoor environment temperature after the compressor is started in real time; comparing the magnitude relation between a first temperature difference between the temperature of the inner air pipe before the compressor is started and the temperature of the inner air pipe after the compressor is started and a first temperature difference threshold value; comparing the magnitude relation between a second temperature difference between the temperature of the inner liquid pipe before the compressor is started and the temperature of the liquid pipe after the compressor is started and a second temperature difference threshold value; comparing the magnitude relation between a third temperature difference between the temperature of the heat exchanger of the outdoor unit and the outdoor environment temperature and a third temperature difference threshold value; and judging whether the four-way valve is abnormal in reversing according to the comparison result of the first temperature difference, the second temperature difference and the third temperature difference.
In a preferred embodiment of the above determining method of the present invention, the step of determining whether the four-way valve is abnormal or not according to the comparison result of the first temperature difference, the second temperature difference, and the third temperature difference specifically includes: and when the first temperature difference is greater than the first temperature difference threshold value, the second temperature difference is greater than the second temperature difference threshold value, and the third temperature difference is greater than the third temperature difference threshold value, judging that the four-way valve is abnormal in reversing.
In a preferred embodiment of the present invention, when comparing the magnitude relationship between the first temperature difference and the first temperature difference threshold value, and then comparing the magnitude relationship between the second temperature difference and the second temperature difference threshold value, the step of determining whether the four-way valve is abnormal according to the comparison result between the first temperature difference, the second temperature difference, and the third temperature difference specifically includes: when the first temperature difference is less than or equal to the first temperature difference threshold value, or when the first temperature difference is greater than the first temperature difference threshold value and the second temperature difference is less than or equal to the second temperature difference threshold value, "comparing the magnitude relationship between the first temperature difference and the first temperature difference threshold value" is returned.
In a preferred embodiment of the present invention, when comparing the magnitude relationship between the second temperature difference and the second temperature difference threshold value, and then comparing the magnitude relationship between the first temperature difference and the first temperature difference threshold value, the step of determining whether the four-way valve is abnormal according to the comparison result between the first temperature difference, the second temperature difference, and the third temperature difference specifically includes: and when the second temperature difference is smaller than or equal to the second temperature difference threshold value, or when the second temperature difference is larger than the second temperature difference threshold value and the first temperature difference is smaller than or equal to the first temperature difference threshold value, returning to 'comparing the magnitude relation between the second temperature difference and the second temperature difference threshold value'.
In a preferable embodiment of the above determining method of the present invention, when the first temperature difference is greater than the first temperature difference threshold and the second temperature difference is greater than the temperature difference threshold, the determining method further includes the following steps: keeping the heat pump air conditioning unit running for a preset time in the current state; comparing the magnitude relation between the first temperature difference between the temperature of the inner air pipe before the compressor is started and the temperature of the inner air pipe after the compressor is started and the first temperature difference threshold value; comparing the magnitude relation between a second temperature difference between the temperature of the inner liquid pipe before the compressor is started and the temperature of the liquid pipe after the compressor is started and a second temperature difference threshold value; according to the result of the second comparison of the first temperature difference and the second temperature difference, selectively comparing the magnitude relation between the third temperature difference between the temperature of the outer machine heat exchanger and the outdoor environment temperature and a third temperature difference threshold value, or returning to the step of comparing the magnitude relation between the first temperature difference between the temperature of the inner machine gas pipe before starting the compressor and the temperature of the inner machine gas pipe after starting the compressor and a first temperature difference threshold value, or returning to the step of comparing the magnitude relation between the second temperature difference between the temperature of the inner machine liquid pipe before starting the compressor and the temperature of the liquid pipe after starting the compressor and a second temperature difference threshold value.
In a preferable embodiment of the judging method of the present invention, the step of selectively comparing a magnitude relationship between a third temperature difference between the temperature of the outer unit heat exchanger and the outdoor ambient temperature and a third temperature difference threshold value, or returning to compare a magnitude relationship between a first temperature difference between the temperature of the inner unit gas pipe before starting the compressor and the temperature of the inner unit gas pipe after starting the compressor and a first temperature difference threshold value, or returning to compare a magnitude relationship between a second temperature difference between the temperature of the inner unit gas pipe before starting the compressor and the temperature of the liquid pipe after starting the compressor and a second temperature difference threshold value according to a result of comparing the first temperature difference and the second temperature difference again specifically includes: and when the comparison result is that the first temperature difference is still larger than the first temperature difference threshold value and the second temperature difference is larger than the second temperature difference threshold value, comparing the magnitude relation between a third temperature difference between the temperature of the outer machine heat exchanger and the outdoor environment temperature and a third temperature difference threshold value.
In a preferred embodiment of the above determining method of the present invention, the four-way valve is an electromagnetic four-way valve, and the step of notifying the four-way valve of commutation specifically includes: and powering on the four-way valve.
In a preferred embodiment of the present invention, the step of acquiring the temperature of the heat exchanger of the external unit after the compressor is started in real time specifically includes: and acquiring the temperature of the outer machine coil pipe after the compressor is started in real time.
In a preferred embodiment of the present invention, the step of acquiring the temperature of the heat exchanger of the external unit after the compressor is started in real time specifically includes: and acquiring the temperature of the defrosting sensor after the compressor is started in real time.
The method for judging the reversing abnormality of the four-way valve of the heat pump air conditioning unit comprises the following steps of: receiving a heating instruction; informing the four-way valve of reversing; obtaining the temperature of an inner air pipe and the temperature of the inner liquid pipe before starting the compressor in real time; starting the compressor; acquiring the temperature of an inner air pipe, the temperature of an inner liquid pipe, the temperature of an outer machine heat exchanger and the outdoor environment temperature after the compressor is started in real time; comparing the magnitude relation between a first temperature difference between the temperature of the inner air pipe before the compressor is started and the temperature of the inner air pipe after the compressor is started and a first temperature difference threshold value; comparing the magnitude relation between a second temperature difference between the temperature of the inner liquid pipe before the compressor is started and the temperature of the liquid pipe after the compressor is started and a second temperature difference threshold value; comparing the magnitude relation between a third temperature difference between the temperature of the heat exchanger of the outdoor unit and the outdoor environment temperature and a third temperature difference threshold value; and judging whether the four-way valve is abnormal or not according to the comparison result of the first temperature difference, the second temperature difference and the third temperature difference.
Compared with the existing method for judging whether the four-way valve is abnormal in reversing through the pressure difference of the high-pressure side and the low-pressure side, the judging method provided by the invention takes the multiple factors of the temperature of the inner air pipe and the temperature of the inner air pipe before and after the compressor is started and the temperature difference change of the temperature of the outdoor heat exchanger and the outdoor environment temperature after the compressor is started as the conditions for judging whether the four-way valve is abnormal in reversing, and the judging result is more accurate. In addition, the temperature sensors for acquiring the parameters are all existing on the heat pump air conditioning unit, and no element is additionally arranged for judging whether the four-way valve is abnormal in reversing, so that the running cost of the unit is reduced to a certain extent.
In another aspect, the present invention further provides a heat pump air conditioning unit, wherein a controller of the heat pump air conditioning unit is configured to execute any one of the above determination methods.
It should be noted that the heat pump air conditioning unit of the present invention has all the technical effects of the method for determining a four-way valve commutation abnormality described above, and those skilled in the art can fully understand based on the description of the control method section, and will not be described herein again.
Drawings
FIG. 1 is a schematic diagram of a particular embodiment of a heat pump air conditioning unit of the present invention;
FIG. 2 is a schematic structural diagram of an exemplary embodiment of a solenoid acquisition four-way valve of the present invention;
FIG. 3 is a flow chart of the main steps of the method for determining the abnormal reversing of the four-way valve according to the present invention;
FIG. 4 is a flowchart illustrating detailed steps of a first embodiment of a method for determining a four-way valve commutation abnormality according to the present invention;
fig. 5 is a flowchart illustrating detailed steps of a second embodiment of a method for determining a four-way valve commutation abnormality according to the present invention.
In fig. 1 and 2, the one-to-one correspondence between the names and reference numbers of the respective components is as follows:
1, a compressor;
2, four-way valve;
20 main valves: 200 main valve body, 201 left piston head, 202 right piston head, 203 piston rod, 204 main slide block, 201First main valve port, 202Second main valve port, 203Third main valve port, 204Fourth main valve port, 20LLeft main control valve port, 20RThe right main control valve port;
21, controlling a valve: 210 control valve body, 211 iron core, 212 control slide block, 213 electromagnetic coil, 214 insulation cover, 215 plugs, 216 screws, 217 compression spring, 211First control valve port, 212Second control valve port, 213Third control valve port, 214A fourth control valve port;
22 a first capillary tube;
23 a second capillary;
24 a third capillary;
25 a fourth capillary;
30 outdoor heat exchangers and 31 outdoor fans;
40 indoor heat exchangers and 41 indoor fans;
5 an expansion valve;
6, a gas-liquid separator;
7, an air pipe is arranged in the air pipe;
and 8, a liquid pipe is arranged in the machine.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The structure and the working principle of the heat pump air conditioning unit, the structure of the electromagnetic four-way valve and the working principle of the electromagnetic four-way valve of the invention are described by taking an air-cooled heat pump air conditioning unit as an example with reference to fig. 1 and 2. Fig. 1 is a schematic structural diagram of a specific embodiment of a heat pump air conditioning unit according to the present invention, and fig. 2 is a schematic structural diagram of a specific embodiment of a four-way solenoid valve according to the present invention.
Referring to fig. 1, the air-cooled heat pump air conditioning unit at least includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 30, an indoor heat exchanger 40, and an expansion valve 5.
In detail, referring to fig. 2, the present embodiment preferably employs a solenoid four-way valve 2, and the four-way valve 2 includes a main valve 20 and a control valve 21.
The main valve 20 includes a main valve body 200, a piston, and a main slider 204; wherein, the main valve body 200 is opened with a first main valve port 201Second main valve port 202Third main valve port 203And a fourth main valve port 204A piston is arranged in the cavity of the main valve body 200, the piston comprises a left piston head 201, a right piston head 202 and a piston rod 203 fixedly connected with the left piston head 201 and the right piston head 202, the diameter of the piston rod 203 is smaller than that of the left piston head 201 and that of the right piston head 202,the outer peripheral walls of the left piston head 201 and the right piston head 202 are connected with the inner cavity wall of the main valve body 200 in a sliding and sealing mode, so that the inner cavity of the main valve body 200 is divided into three sub-cavities which are sealed mutually, namely a left sub-cavity, a middle sub-cavity and a right sub-cavity, and no matter how long the sliding distance of the main sliding block 204 relative to the main valve body 200 is, four main valves 20 on the main valve body 200 are all arranged in the middle sub-cavity formed by the left piston head 201, the right piston head 202 and the inner cavity wall.
The main slider 204 is a bowl-shaped structure, the bowl bottom of the main slider is fixedly connected to the piston rod 203, the bowl edge of the main slider is reversely buckled on the inner wall of the middle sub-chamber of the main valve body 200, the inner wall at the reversed position and the inner wall form a chamber of the main slider 204, and the bowl edge of the main slider 204 is connected with the inner wall of the main valve body 200 in a sliding and sealing mode. As the piston slides relative to main valve body 200, main spool 204 also slides to open second main valve port 202And a fourth main valve port 204Or to open the third main valve port 203And a fourth main valve port 204At this time, the other two remaining main valve ports are conducted through the middle sub-chamber, so that the four-way valve 2 forms two working positions.
A first operating position and a second operating position, wherein when the four-way valve 2 is in the first operating position, the first main valve port 201And a second main valve port 202Conducting, third main valve port 203And a fourth main valve port 204Conducting; when the four-way valve 2 is in the second operating position, the first main valve port 201And a third main valve port 203Conducting, second main valve port 202And a fourth main valve port 204And conducting.
The sliding of the piston within the main valve body 200 is controlled by the control valve 21. With continued reference to fig. 2, the control valve 21 includes a control valve body 210, a solenoid 213, and an insulating cover 214; wherein, the electromagnetic coil 213 is wound on the outer peripheral wall of the right end of the control valve body 210, the insulating cover 214 covers the electromagnetic coil 213 and is fixedly connected to the plug 215 of the control valve body 210 through the screw 216, and the electromagnetic coil 213 is electrically connected with an external power supply.
The control valve body 210 is a barrel-shaped structure with an open right end, and the open end is blocked by a plug 215 to form a closed chamberThe iron core 211 is installed in the chamber, the inner walls of the iron core 211 and the control valve body 210 are in sliding connection in a sealing mode, the iron core 211 divides the chamber of the control valve body 210 into a left sub-chamber and a right sub-chamber, wherein the control valve body 210 is provided with four control valve ports, the four control valve ports are all communicated with the left sub-chamber and are respectively a first control valve port 211Second control valve port 212Third control valve port 213And a fourth control valve port 214。
A compression spring 217 is arranged in the right sub-chamber of the control valve body 210, the compression spring 217 is connected with the iron core 211 and the plug 215, a control slider 212 is arranged in the left sub-chamber, the control slider 212 is a bowl-shaped slider, the side wall of the control slider is fixedly connected to the iron core 211 through a connecting rod, the edge of the bowl is reversely buckled on the inner wall of the control valve body 210 and forms an independent sub-chamber with the inner wall in a surrounding mode, and the edge of the bowl of the control slider 212 is connected with the inner wall of the control valve body 210 in a sliding sealing mode.
FIG. 2 is a schematic diagram of the structure of the four-way valve 2 when the electromagnetic coil 213 is powered on, the iron core 211 compresses the spring 217 under the action of the electromagnetic force, and the control slider 212 conducts the second control valve port 212And a fourth control valve port 214First control valve port 211And a third control valve port 213And is conducted through the left sub-chamber. When the solenoid coil 213 is de-energized, the iron core 211 slides leftwards under the spring force of the compression spring 217 until the control slider 212 opens the third control valve port 213And a fourth control valve port 214The left sub-chamber is conducted with the first control valve port 211And a second control valve port 212。
With continued reference to fig. 2, the main valve body 200 is further provided with a left main control valve port 20LAnd a right main control valve port 20RWherein the left main control valve port 20LCommunicating with the left sub-chamber, the right main control valve port 20RAnd the right sub-chamber.
The four-way valve 2 further comprises a first capillary 22, a second capillary 23, a third capillary 24 and a fourth capillary 25, wherein the first capillary 22 communicates with the first main valve port 201And a first control valve port 211The second capillary 23 is connected to the rightMain control valve port 20RAnd a second control valve port 212 Third capillary 24 connects to left main control valve port 20LAnd a third control valve port 213 Fourth capillary 25 communicates with fourth main valve port 204And a fourth control valve port 214。
With continued reference to FIG. 1, the discharge of the compressor 1 and the first main valve port 20 of the four-way valve 21A suction port thereof communicates with a fourth main valve port 20 of the four-way valve 24One port of the outdoor heat exchanger 30 and a second main valve port 20 of the four-way valve 2 are communicated through the gas-liquid separator 62The other port of the outdoor heat exchanger 30 is communicated with one port of the expansion valve 5, one port of the indoor heat exchanger 40 is communicated with the third main valve port 20 of the four-way valve 23The other port of the indoor heat exchanger 40 and the other port of the expansion valve 5 are communicated through the inner liquid pipe 7 and the inner liquid pipe 8.
Referring to fig. 1 and 2, after the heat pump air conditioning unit receives a heating command, the electromagnetic coil 213 is powered on, the four-way valve 2 is located at the working position in fig. 2, and at this time, a high-pressure high-temperature refrigerant at the exhaust port of the compressor 1 flows into the left sub-chamber of the control valve 21 through the first capillary tube 22, and then flows from the third control valve port 213And a third capillary 24 into the left sub-chamber of the main valve body 200, pushing the piston into position such that the first main valve port 201And a third main valve port 203Conducting, second main valve port 202And a fourth main valve port 204At the conducting position, the refrigerant in the right sub-chamber of the main valve body 200 flows through the right main control valve port 20RFlows into the second capillary 23 and finally flows out of the second control valve port 212 Inflow control slider 212And the control valve body 210.
When the four-way valve 2 is successfully reversed, the refrigerant is pressurized by the compressor 1 to become high-temperature and high-pressure gas, the high-temperature and high-pressure gas enters the indoor heat exchanger 40, is condensed, liquefied and released heat to become liquid refrigerant, and meanwhile, indoor air is heated, so that the purpose of increasing the indoor temperature is achieved. At the same time, the liquid refrigerant is decompressed by the expansion valve 5, enters the outdoor heat exchanger 30 to exchange heat with the outdoor environment, evaporate, gasify and absorb heat to become a gas refrigerant, and the gas refrigerant enters the compressor 1 again to start the next heating cycle.
The above process is a working process when the four-way valve 2 is normally reversed after the heat pump air-conditioning unit receives a heating instruction, but the situation that the four-way valve 2 is abnormally reversed in the background technology, that is, the four-way valve 2 is failed to be reversed, can occur due to various unpredictable reasons, so that the heat pump air-conditioning unit can not normally work.
Therefore, the invention also provides a method for judging the abnormal reversing of the four-way valve 2, and referring to fig. 3, the method for judging the abnormal reversing of the four-way valve 2 comprises the following steps:
and S10, receiving a heating command.
It should be noted that the heating instruction is usually sent by a user through a corresponding key on a remote controller, or for a heat pump air conditioning unit with a higher intelligent control level in the field of smart home, a controller thereof automatically executes the heating instruction according to factors such as indoor and outdoor environment temperature and indoor user state.
And S20, informing the four-way valve 2 of reversing.
The way of controlling the four-way valve 2 to change direction is different according to the specific structure of the four-way valve 2, for example, the electromagnetic four-way valve 2 described above notifies the four-way valve 2 to change direction by powering on or powering off the electromagnetic coil 213, specifically, after receiving a heating instruction, powering on the electromagnetic coil 213 to control the electromagnetic coil 213 to be located at the working position satisfying the heating mode, and after finishing heating or receiving a cooling instruction, powering off the electromagnetic coil 213 to be located at the working position satisfying the cooling mode.
It can be understood that, besides the electromagnetic four-way valve 2, the method for determining the abnormal reversing of the four-way valve 2 of the present invention is also applicable to other types of four-way valves 2,
and S30, acquiring the temperature of the inner gas pipe and the temperature of the inner liquid pipe before the compressor 1 is started in real time.
All be provided with temperature sensor on interior trachea 7 and the interior liquid pipe 8, interior trachea temperature and interior liquid pipe temperature have these two temperature sensor to acquire respectively, these two temperature sensor and heat pump air conditioning unit's controller communication connection to transmit it to the controller, supply the controller to call in follow-up control step.
S40, starting the compressor 1.
The compressor 1 is usually started by energizing the compressor 1 or by reactivating the compressor 1 in a sleep mode. Those skilled in the art can set the operation principle according to the specific structure and operation principle of the compressor 1.
And S50, acquiring the temperature of the inner air pipe, the temperature of the inner liquid pipe, the temperature of the outer machine heat exchanger and the outdoor environment temperature after the compressor 1 is started in real time.
As mentioned above, the temperature of the inner gas pipe and the temperature of the inner liquid pipe after the compressor 1 is started can also be obtained by the two temperature sensors and transmitted to the controller for storage, so that the controller can be used for taking.
S60, comparing the first temperature difference between the temperature of the inner air pipe before the compressor 1 is started and the temperature of the inner air pipe after the compressor 1 is started with the first temperature difference threshold value.
It should be noted that the first temperature difference threshold is set in a manner that, in consideration of the environmental impact of the internal air pipe 7 and the impact of other factors, after the heat pump air conditioning unit receives a heating instruction, the maximum range of temperature reduction of the internal air pipe is allowed before and after the reversing of the four-way valve 2 and the starting stage of the compressor 1, and the first temperature difference threshold is usually between 0 ℃ and 3 ℃, that is, the first temperature difference threshold is greater than or equal to 0 ℃ and less than or equal to 3 ℃.
Of course, on the basis of the above-mentioned setting principle that the first temperature threshold is satisfied, a person skilled in the art may set the specific temperature range according to other parameters of the power meter of the heat pump air conditioning unit.
And S70, comparing the magnitude relation between the second temperature difference between the temperature of the inner liquid pipe before the compressor 1 is started and the temperature of the inner liquid pipe after the compressor 1 is started and the second temperature difference threshold value.
Similarly, the second temperature difference threshold is set according to the principle that the maximum range of the temperature decrease of the internal liquid pipe allowed before and after the reversing of the four-way valve 2 and the starting stage of the compressor 1 is obtained after the heat pump air conditioning unit receives the heating instruction, and the second temperature difference threshold is usually between 0 ℃ and 3 ℃, that is, the second temperature difference threshold is greater than or equal to 0 ℃ and less than or equal to 3 ℃.
Of course, on the basis of the above-mentioned setting principle that the second temperature threshold is satisfied, a person skilled in the art can set a specific temperature range according to the power and other parameters of the heat pump air conditioning unit.
And S80, comparing the magnitude relation between the third temperature difference between the outdoor heat exchanger temperature and the outdoor ambient temperature after the compressor 1 is started and the third temperature difference threshold value.
It should be noted that there are two ways to obtain the temperature of the outdoor heat exchanger, the first way is to obtain the temperature of the outdoor unit coil by a coil temperature sensor installed on the coil of the outdoor heat exchanger 30, and the second way is to obtain the temperature of the defrost sensor by the defrost sensor of the outdoor heat exchanger 30. Regardless of the manner in which the outdoor heat exchanger temperature is obtained, it is ultimately transmitted to the controller for storage and retrieval by the controller.
The outdoor environment temperature is directly obtained by a temperature sensor arranged in the outdoor environment, and then is transmitted to the controller for storage and retrieval by the controller.
The third temperature difference threshold is set by considering the environmental impact of the outdoor heat exchanger 30 and other factors, after the heat pump air conditioning unit receives a heating instruction, the temperature of the outdoor heat exchanger is allowed to be larger than the maximum range of the outdoor ambient temperature before and after the reversing of the four-way valve 2 and the starting stage of the compressor 1, and is usually between 0 ℃ and 3 ℃ under the third temperature difference threshold, namely the third temperature difference threshold is larger than or equal to 0 ℃ and smaller than or equal to 3 ℃.
And S90, judging whether the reversing of the four-way valve 2 is abnormal or not according to the comparison result of the first temperature difference, the second temperature difference and the third temperature difference.
Compared with the existing method for judging whether the four-way valve 2 is abnormal in reversing through the pressure difference of the high-pressure side and the low-pressure side, the judging method provided by the invention considers the temperature of the inner air pipe and the temperature of the inner air pipe before and after the compressor 1 is started, and a plurality of factors of the temperature difference change of the outdoor heat exchanger and the outdoor environment temperature after the compressor 1 is started as conditions for judging whether the four-way valve 2 is abnormal in reversing, so that the judging result is more accurate. In addition, the temperature sensors for acquiring the parameters are all existing on the heat pump air conditioning unit, and no element is additionally arranged for judging whether the four-way valve 2 is abnormal in reversing, so that the running cost of the unit is reduced to a certain extent.
Next, a specific implementation method of the step of "determining whether the four-way valve 2 is abnormal in commutation according to the comparison result of the first temperature difference, the second temperature difference, and the third temperature difference" in the method for determining abnormal commutation of the four-way valve 2 is described with reference to fig. 4 in a first specific embodiment, where fig. 4 is a detailed step flowchart of the first specific embodiment of the method for determining abnormal commutation of the four-way valve 2 of the heat pump air conditioning unit according to the present invention.
Referring to fig. 4, the step of determining whether the four-way valve 2 is abnormal or not according to the comparison result of the first temperature difference, the second temperature difference and the third temperature difference specifically includes:
s60, judging whether a first temperature difference between the temperature of the internal air pipe before the compressor 1 is started and the temperature of the internal air pipe after the compressor 1 is started is larger than a first temperature difference threshold value, if so, executing a step S70, otherwise, returning to the step S60.
S70, judging whether a second temperature difference between the temperature of the inner liquid pipe before the compressor 1 is started and the temperature of the inner liquid pipe after the compressor 1 is started is larger than a second temperature difference threshold value, if so, executing a step S80, otherwise, returning to the step S60.
S80, judging whether the third temperature difference between the outdoor heat exchanger temperature and the outdoor environment temperature after the compressor 1 is started is larger than a third temperature difference threshold value, if so, executing a step S90, otherwise, returning to the step S60.
S90, the four-way valve 2 fails to reverse.
That is, when the first temperature difference is greater than the first temperature difference threshold value, the second temperature difference is greater than the second temperature difference threshold value, and the third temperature difference is greater than the third temperature difference threshold value, it indicates that the four-way valve 2 is abnormal in commutation.
It should be noted that, in this embodiment, the execution sequence of steps S60 and S70 is adjustable, specifically, it may be determined whether a second temperature difference between the temperature of the internal liquid pipe before the compressor 1 is started and the temperature of the internal liquid pipe after the compressor 1 is started is greater than a second temperature difference threshold, if so, it is determined whether a first temperature difference between the temperature of the internal liquid pipe before the compressor 1 is started and the temperature of the internal liquid pipe after the compressor 1 is started is greater than the first temperature difference threshold, otherwise, the step of "determining whether a second temperature difference between the temperature of the internal liquid pipe before the compressor 1 is started and the temperature of the internal liquid pipe after the compressor 1 is started is greater than the second temperature difference threshold" is returned.
When the first temperature difference is larger than the first temperature difference threshold value, whether a third temperature difference between the temperature of the outdoor heat exchanger and the outdoor ambient temperature after the compressor 1 is started is larger than a third temperature difference threshold value is judged, and if the first temperature difference is smaller than or equal to the first temperature difference threshold value, the step of judging whether a second temperature difference between the temperature of the inner liquid pipe before the compressor 1 is started and the temperature of the inner liquid pipe after the compressor 1 is started is carried out is returned.
Preferably, the present invention further provides a second specific embodiment of the method for determining the abnormal reversing of the four-way valve 2, so as to optimize the method for determining the abnormal reversing of the first specific embodiment, and the step flow of the second specific embodiment is described in detail below with reference to fig. 5.
Referring to fig. 5, compared with the first embodiment in fig. 4, steps S100, S60 'and S70' are added between steps S70 and S80 in the second embodiment, and the differences will be described with reference to fig. 5, and other similar steps will not be described again.
Referring to fig. 5, in this embodiment, when the determination result of step S70 is that the second temperature difference is greater than the second temperature difference threshold, the method for determining the abnormal commutation of the four-way valve 2 further includes the following steps:
s100, keeping the heat pump air conditioning unit to operate in the current state for a preset time;
s60 ', judging whether a first temperature difference between the temperature of the internal air pipe before the compressor 1 is started and the temperature of the internal air pipe after the compressor 1 is started is larger than a first temperature difference threshold value, if so, executing a step S70', otherwise, returning to the step S60;
s70', determining whether a second temperature difference between the temperature of the inner liquid tube before starting the compressor 1 and the temperature of the inner liquid tube after starting the compressor 1 is greater than a second temperature difference threshold, if yes, executing step S80, otherwise, returning to step S60.
The purpose of adding these three steps always in this embodiment is to determine whether the first temperature difference is greater than the first temperature difference threshold and the second temperature difference is greater than the second temperature difference threshold is instantaneous fluctuation caused by external factors, and if the instantaneous fluctuation indicates that the instantaneous fluctuation is not caused by abnormal commutation of the four-way valve 2, so that the accuracy of judging the structure can be improved.
It should be noted that the preset time duration in step S100 is set by considering the time when the temperature of the internal liquid pipe and the temperature of the internal liquid pipe decrease due to various factors at the initial start-up stage of the compressor 1, and those skilled in the art can set the specific value range according to actual situations.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A method for judging the reversing abnormality of a four-way valve of a heat pump air conditioning unit is characterized by comprising the following steps:
receiving a heating instruction;
informing the four-way valve of reversing;
obtaining the temperature of an inner air pipe and the temperature of the inner liquid pipe before starting the compressor in real time;
starting the compressor;
acquiring the temperature of an inner air pipe, the temperature of an inner liquid pipe, the temperature of an outer machine heat exchanger and the outdoor environment temperature after the compressor is started in real time;
comparing the magnitude relation between a first temperature difference between the temperature of the inner air pipe before the compressor is started and the temperature of the inner air pipe after the compressor is started and a first temperature difference threshold value;
comparing the magnitude relation between a second temperature difference between the temperature of the inner liquid pipe before the compressor is started and the temperature of the liquid pipe after the compressor is started and a second temperature difference threshold value;
comparing the magnitude relation between a third temperature difference between the temperature of the outer unit heat exchanger and the outdoor environment temperature and a third temperature difference threshold value;
and judging whether the four-way valve is abnormal in reversing according to the comparison result of the first temperature difference, the second temperature difference and the third temperature difference.
2. The method according to claim 1, wherein the step of determining whether the four-way valve is abnormal or not according to the comparison result of the first temperature difference, the second temperature difference and the third temperature difference specifically comprises:
and when the first temperature difference is greater than the first temperature difference threshold value, the second temperature difference is greater than the second temperature difference threshold value, and the third temperature difference is greater than the third temperature difference threshold value, judging that the four-way valve is abnormal in reversing.
3. The method according to claim 2, wherein when comparing the magnitude relationship between the first temperature difference and the first temperature difference threshold value and then comparing the magnitude relationship between the second temperature difference and the second temperature difference threshold value, the step of determining whether the four-way valve is abnormal or not according to the comparison result between the first temperature difference, the second temperature difference, and the third temperature difference specifically comprises:
when the first temperature difference is less than or equal to the first temperature difference threshold value, or when the first temperature difference is greater than the first temperature difference threshold value and the second temperature difference is less than or equal to the second temperature difference threshold value, "comparing the magnitude relationship between the first temperature difference and the first temperature difference threshold value" is returned.
4. The method according to claim 2, wherein when comparing the magnitude relationship between the second temperature difference and the second temperature difference threshold value and then comparing the magnitude relationship between the first temperature difference and the first temperature difference threshold value, the step of determining whether the four-way valve is abnormal or not according to the comparison result between the first temperature difference, the second temperature difference, and the third temperature difference specifically comprises:
and when the second temperature difference is smaller than or equal to the second temperature difference threshold value, or when the second temperature difference is larger than the second temperature difference threshold value and the first temperature difference is smaller than or equal to the first temperature difference threshold value, returning to 'comparing the magnitude relation between the second temperature difference and the second temperature difference threshold value'.
5. The determination method according to any one of claims 1 to 4, characterized in that when the first temperature difference is larger than the first temperature difference threshold value and the second temperature difference is larger than the temperature difference threshold value, the determination method further comprises the steps of:
keeping the heat pump air conditioning unit running for a preset time in the current state;
comparing the magnitude relation between the first temperature difference between the temperature of the inner air pipe before the compressor is started and the temperature of the inner air pipe after the compressor is started and the first temperature difference threshold value;
comparing the magnitude relation between a second temperature difference between the temperature of the inner liquid pipe before the compressor is started and the temperature of the liquid pipe after the compressor is started and a second temperature difference threshold value;
and according to the second comparison result of the first temperature difference and the second temperature difference, selectively comparing the magnitude relation between the third temperature difference between the temperature of the outer machine heat exchanger and the outdoor environment temperature and a third temperature difference threshold value, or returning to compare the magnitude relation between the first temperature difference between the temperature of the inner machine gas pipe before starting the compressor and the temperature of the inner machine gas pipe after starting the compressor and a first temperature difference threshold value, or returning to compare the magnitude relation between the second temperature difference between the temperature of the inner machine gas pipe before starting the compressor and the temperature of the liquid pipe after starting the compressor and a second temperature difference threshold value.
6. The method according to claim 5, wherein the step of selectively comparing a magnitude relationship between a third temperature difference between the temperature of the outdoor unit heat exchanger and the outdoor ambient temperature and a third temperature difference threshold value according to the result of the second comparison between the first temperature difference and the second temperature difference, or returning to the step of comparing a magnitude relationship between a first temperature difference between the temperature of the indoor unit air pipe before starting the compressor and the temperature of the indoor unit air pipe after starting the compressor and the first temperature difference threshold value ", or returning to the step of comparing a magnitude relationship between a second temperature difference between the temperature of the indoor unit air pipe before starting the compressor and the temperature of the indoor unit air pipe after starting the compressor and the second temperature difference threshold value" specifically comprises:
and when the comparison result is that the first temperature difference is still larger than the first temperature difference threshold value and the second temperature difference is larger than the second temperature difference threshold value, comparing the magnitude relation between a third temperature difference between the temperature of the outer unit heat exchanger and the outdoor environment temperature and a third temperature difference threshold value.
7. The judgment method according to any one of claims 1 to 4, wherein the four-way valve is an electromagnetic four-way valve, and the step of "notifying the four-way valve of commutation" specifically comprises:
and powering on the four-way valve.
8. The judgment method according to any one of claims 1 to 4, wherein the step of acquiring the temperature of the outer unit heat exchanger after the compressor is started in real time specifically comprises the steps of:
and acquiring the temperature of the outer machine coil pipe after the compressor is started in real time.
9. The judgment method according to any one of claims 1 to 4, wherein the step of acquiring the temperature of the outer unit heat exchanger after the compressor is started in real time specifically comprises the steps of:
and acquiring the temperature of the defrosting sensor after the compressor is started in real time.
10. A heat pump air conditioning unit, characterized by comprising a controller for executing the method for determining the abnormal reversing of the four-way valve according to any one of claims 1 to 9.
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