CN115289604A - Heating overload protection method and device and air conditioner - Google Patents
Heating overload protection method and device and air conditioner Download PDFInfo
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- CN115289604A CN115289604A CN202210968473.5A CN202210968473A CN115289604A CN 115289604 A CN115289604 A CN 115289604A CN 202210968473 A CN202210968473 A CN 202210968473A CN 115289604 A CN115289604 A CN 115289604A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 49
- 239000007788 liquid Substances 0.000 claims abstract description 37
- 238000010977 unit operation Methods 0.000 claims abstract description 5
- 238000004891 communication Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 description 12
- 230000002159 abnormal effect Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 210000003437 trachea Anatomy 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
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- 238000004519 manufacturing process 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
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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
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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
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F11/88—Electrical aspects, e.g. circuits
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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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Air Conditioning Control Device (AREA)
Abstract
The invention provides a heating overload protection method and device and an air conditioner. The heating overload protection method comprises the following steps: acquiring a unit operation mode, and acquiring the temperature T of an outdoor air pipe when the unit operates in a heating mode; judging the relation between the T gas and the preset temperature; when the judgment result meets a first preset condition, controlling the unit according to the judgment result; when the judgment result meets a second preset condition, acquiring the temperature Tliquid of the liquid pipe; acquiring the temperature difference delta T1 between the air pipe and the liquid pipe; and controlling the unit according to the delta T1. The heating overload protection method can effectively avoid the conditions of pressure and overhigh load of the whole machine caused by the abnormity of the temperature sensing bulb of the inner machine pipe, and improve the running reliability of the whole machine.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to a heating overload protection method and device and an air conditioner.
Background
When the existing air conditioner operates in a heating mode, the exhaust pressure and the exhaust temperature of a compressor are increased to a higher temperature due to overhigh operating frequency of a unit, and at the moment, load reduction treatment needs to be carried out on an air conditioning system to reduce the exhaust pressure and the exhaust temperature of the compressor and ensure the reliability of the air conditioner. The processing mode of heating overload protection adopted by each existing air conditioner manufacturer is similar, the temperature of the pipe of an internal machine is detected during heating, and when the temperature of the pipe of the internal machine is detected to be higher than a set threshold temperature, an external machine is in a frequency reduction state or a shutdown state, so that a unit enters heating overload protection, and when the temperature of the unit is reduced to be lower than a safe temperature, the unit exits the heating overload protection.
Most of the existing heating overload protection simply depends on the detection of a pipe temperature sensing bulb of an internal machine to realize the heating overload protection, the mode of the heating overload protection is not flexible enough, and the pipe temperature change of a system is influenced by the attenuation of the environmental temperature, so that the problem of inaccurate detection is easily caused.
In addition, the current heating overload protection is required to be detected by an inner machine pipe temperature sensing bulb, if the inner machine pipe temperature sensing bulb is invalid or forgets to be connected into the pipe temperature sensing bulb in the using process, the conditions that the pressure and the exhaust temperature are too high and overload protection is not carried out are caused, and the compressor is abnormal.
Disclosure of Invention
The invention mainly aims to provide a heating overload protection method and device and an air conditioner, which can effectively avoid the conditions of pressure and overhigh load of the whole machine caused by the abnormity of an inner machine pipe temperature sensing bulb and improve the running reliability of the whole machine.
In order to achieve the above object, according to an aspect of the present invention, there is provided a heating overload protection method including:
acquiring the unit operation mode, when the unit operates the heating mode,
acquiring the temperature T of an outdoor air pipe;
judging the relation between the T gas and the preset temperature;
when the judgment result meets a first preset condition, controlling the unit according to the judgment result;
when the judgment result meets the second preset condition,
obtaining the temperature Tliquid of the liquid pipe;
acquiring the temperature difference delta T1 between the air pipe and the liquid pipe;
and controlling the unit according to the delta T1.
Further, when the judgment result meets the first preset condition, the step of controlling the unit according to the judgment result comprises:
when the T gas is less than or equal to N1, the unit is controlled to maintain the current heating operation state;
and when the gas is more than N1 and less than or equal to N2, controlling the unit to limit or reduce the frequency.
Further, the second preset condition is that T gas is greater than N2, and the step of controlling the unit according to the delta T1 comprises the following steps:
when the delta T1 is larger than or equal to N3, controlling the unit to limit or reduce the frequency;
and when the delta T1 is less than N3, controlling the unit to perform shutdown protection.
Further, when the unit operates in the heating mode, the step of acquiring the outdoor air pipe temperature T is directly carried out.
Further, when the unit operates in the heating mode, before entering the step of acquiring the outdoor air pipe temperature T, the method further includes:
obtaining the temperature T of the inner tube;
adjusting the running state of the unit according to the temperature T of the inner pipe;
when n1 is less than or equal to T, the unit maintains the current heating operation state;
when n1 is more than T and less than n2, controlling the unit to limit frequency or reduce frequency;
and when the T is more than or equal to n2, controlling the unit to carry out shutdown protection.
Further, when the unit operates in the heating mode, before entering the step of obtaining the outdoor air pipe temperature T, the method further includes:
detecting whether the inner pipe temperature sensing bulb is invalid or not;
when the inner pipe temperature sensing bulb is not invalid, the step of adjusting the running state of the unit according to the temperature T of the inner pipe is carried out;
and when the inner pipe temperature sensing bulb fails, the step of obtaining the temperature T of the outdoor air pipe is carried out.
Further, the step of detecting whether the inner tube thermal bulb is failed comprises the following steps:
acquiring an inner pipe temperature difference delta T2 sensed by an inner pipe temperature sensing bulb before and after the unit operates for T1 time;
when the temperature difference delta T2 of the inner pipe is not equal to 0, judging that the temperature sensing package of the inner pipe does not lose efficacy;
and when the temperature difference delta T2 of the inner pipe is =0, judging that the temperature sensing bulb of the inner pipe fails.
According to another aspect of the present invention, there is provided a heating overload protection apparatus for implementing the above-mentioned heating overload protection method, the heating overload protection apparatus including an outdoor unit, a first temperature sensing bulb disposed on an air pipe of the outdoor unit, and a second temperature sensing bulb disposed on a liquid pipe of the outdoor unit, the first temperature sensing bulb being configured to sense a pipe temperature of the air pipe, and the second temperature sensing bulb being configured to sense a pipe temperature of the liquid pipe.
Further, the outdoor unit comprises a compressor, a throttling component, a four-way valve and an outdoor heat exchanger, wherein the air pipe is connected with an exhaust port of the compressor through the four-way valve, and the liquid pipe is connected to the throttling component.
Furthermore, the outdoor unit further comprises an outdoor unit main board, and the first temperature sensing bulb and the second temperature sensing bulb are in communication connection with the outdoor unit main board.
According to another aspect of the present invention, there is provided an air conditioner including a heating overload protection apparatus as described above.
By applying the technical scheme of the invention, the heating overload protection method comprises the following steps: acquiring a unit operation mode, and acquiring the temperature T of an outdoor air pipe when the unit operates in a heating mode; judging the relation between the T gas and the preset temperature; when the judgment result meets a first preset condition, controlling the unit according to the judgment result; when the judgment result meets a second preset condition, acquiring the temperature Tliquid of the liquid pipe; acquiring the temperature difference delta T1 between the air pipe and the liquid pipe; and controlling the unit according to the delta T1. The heating overload protection method can utilize the gas pipe temperature and the liquid pipe temperature to carry out heating overload protection on the unit by detecting the gas pipe temperature and the liquid pipe temperature, reduces the hidden danger of heating overload protection caused by the abnormity of the pipe temperature sensing package of the inner unit through the control logic of the outer unit, greatly increases the reliability of the whole unit in the heating operation process, in addition, the scheme originally belonging to the program control of the inner unit can be transferred to the outer unit to be controlled through the heating overload protection method, the abnormity caused by the communication connection of the inner unit and the outer unit is reduced, the generation of abnormal reliability is avoided, meanwhile, the dependence of control software on the inner unit is reduced, and the outer unit can realize the overload protection of the unit heating without the program processing of the inner unit.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 illustrates a control schematic of a heating overload protection method of an embodiment of the present invention;
FIG. 2 illustrates a control flow diagram of a heating overload protection method of an embodiment of the present invention;
FIG. 3 illustrates a structural schematic of the heating overload protection of an embodiment of the present invention; and
fig. 4 shows a control structure diagram of the heating overload protection of the embodiment of the present invention.
Wherein the figures include the following reference numerals:
1. an outdoor unit; 2. a first bulb; 3. a second bulb; 4. a compressor; 5. a throttling member; 6. a four-way valve; 7. an outdoor heat exchanger; 8. an indoor heat exchanger.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 to 4 in combination, according to an embodiment of the present invention, a heating overload protection method includes: acquiring a unit operation mode, and acquiring the temperature T of an outdoor air pipe when the unit operates in a heating mode; judging the relation between the T gas and the preset temperature; when the judgment result meets a first preset condition, controlling the unit according to the judgment result; when the judgment result meets a second preset condition, acquiring the temperature Tliquid of the liquid pipe; acquiring the temperature difference delta T1 between the air pipe and the liquid pipe; and controlling the unit according to the delta T1.
The heating overload protection method can utilize the gas pipe temperature and the liquid pipe temperature to carry out heating overload protection on the unit by detecting the gas pipe temperature and the liquid pipe temperature, reduces the hidden danger of heating overload protection caused by the abnormity of the pipe temperature sensing package of the inner unit through the control logic of the outer unit, greatly increases the reliability of the whole unit in the heating operation process, in addition, the scheme originally belonging to the program control of the inner unit can be transferred to the outer unit to be controlled through the heating overload protection method, the abnormity caused by the communication connection of the inner unit and the outer unit is reduced, the generation of abnormal reliability is avoided, meanwhile, the dependence of control software on the inner unit is reduced, and the outer unit can realize the overload protection of the unit heating without the program processing of the inner unit.
In one embodiment, when the judgment result meets the first preset condition, the step of controlling the unit according to the judgment result includes: when the T gas is less than or equal to N1, the unit is controlled to maintain the current heating operation state; and when the gas is more than N1 and less than or equal to N2, controlling the unit to limit or reduce the frequency.
In this embodiment, the first preset condition is that T gas is less than or equal to N1 or N1 is less than T gas and less than or equal to N2, and when different first preset conditions are satisfied, the unit executes different control programs.
Heating is at the operation in-process, and the high temperature gas that 4 gas vents of compressor came out directly enters into the internal unit through cross valve 6 behind the trachea of off-premises station 1, and the trachea temperature detects T gas then and detects the entry temperature who enters into indoor heat exchanger 8 this moment, and the refrigerant is through the liquid pipe of off-premises station 1 after the heat transfer of indoor heat exchanger 8, and liquid pipe temperature T liquid that detects on the liquid pipe this moment is then the exit temperature who detects indoor heat exchanger 8.
When the T gas is detected to be less than or equal to N1 (N1 generally takes a value of 58-60 ℃), the unit maintains the current heating operation state. Because the temperature is attenuated in the heat exchange process, the inlet of the indoor heat exchanger 8 is at 50-60 ℃, the temperature is generally in the heat exchange process, the outlet air temperature of the indoor heat exchanger 8 can reach 40-50 ℃, the load of the unit is in the normal range at the moment, the normal working range can be met, and the current heating running state is maintained.
When the gas T is more than N1 and less than or equal to N2 (N2 is generally selected at 70-75 ℃), the frequency of the unit is limited. Because the temperature is attenuated in the heat exchange process, the inlet of the indoor heat exchanger 8 is at 70-75 ℃, generally in the heat exchange process, the integral temperature of the indoor heat exchanger 8 can reach 55-60 ℃, the load of the unit is large, and the load of the unit needs to be reduced by limiting the frequency.
In one embodiment, the second preset condition is T gas > N2, and when the operation of the unit satisfies the second preset condition, the step of controlling the unit according to Δ T1 includes: when the delta T1 is larger than or equal to N3, controlling the unit to limit or reduce the frequency; and when the delta T1 is less than N3, controlling the unit to perform shutdown protection.
When the detected T gas is more than N2 (N2 generally takes a value of 70-75 ℃), the liquid pipe temperature Tliquid is synchronously detected, and the temperature difference delta T1 value of the air pipe temperature Tgas and the liquid pipe temperature Tliquid is calculated for processing and judgment.
When the delta T2 is larger than or equal to N3 (the value of N3 is 10-15 ℃), the temperature of the liquid pipe of the indoor heat exchanger 8 is about 55-60 ℃, the temperature of the whole indoor heat exchanger 8 is about 58-60 ℃, the load of the indoor heat exchanger 8 system is large at this time, and the load of the unit needs to be reduced by limiting frequency.
When the delta T2 is less than N3 (the value of N3 is 10-15 ℃), the temperature of the liquid pipe of the indoor heat exchanger 8 is more than 55-60 ℃, the overall temperature of the indoor heat exchanger 8 is more than 58-60 ℃, and the load of the indoor heat exchanger 8 is higher at this moment, so that the shutdown treatment is required.
In one embodiment, the step of obtaining the outdoor air pipe temperature Tgas is directly entered when the unit is operating in the heating mode. In this embodiment, the scheme that the traditional heating overload protection method utilizes the inner pipe temperature sensing bag to judge the temperature of the indoor heat exchanger is completely abandoned, the scheme that the temperature of the liquid pipe and the temperature of the air pipe are directly used for temperature acquisition, and the heating overload protection processing is carried out in a more direct mode.
In one embodiment, when the unit operates in the heating mode, before entering the step of acquiring the outdoor air pipe temperature T, the method further includes: obtaining the temperature T of the inner tube; adjusting the running state of the unit according to the temperature T of the inner pipe; when the number n1 in the T is less than or equal to n1, the unit maintains the current heating operation state; when n1 is more than T and less than n2, controlling the unit to limit frequency or reduce frequency; and when the T is more than or equal to n2, controlling the unit to carry out shutdown protection.
In one embodiment, when the unit operates in the heating mode, before entering the step of obtaining the outdoor air pipe temperature T, the method further comprises: detecting whether the inner tube temperature sensing bulb is invalid or not; when the inner pipe temperature sensing bulb is not invalid, the operation state of the unit is adjusted according to the temperature T of the inner pipe; and when the inner pipe temperature sensing bulb fails, the step of obtaining the temperature T of the outdoor air pipe is carried out.
The embodiment provides a new protection control design under the existing heating overload protection mode, so that when the inner tube temperature sensing bulb of the unit fails or the temperature sensing bulb is not inserted during manual operation, another mode is provided to ensure the reliability of the unit in the heating operation process.
In this embodiment, can judge the operating condition of inner tube temperature sensing package at first, under the condition of inner tube temperature sensing package normal work, do not gather trachea temperature and liquid pipe temperature, can adopt traditional mode to carry out the heating overload protection of unit, under the unable normal work's of inner tube temperature sensing package condition, just can gather trachea temperature and liquid pipe temperature, and then adopt the mode of outer machine control to carry out the heating overload protection of unit. The control method combines the traditional inner machine control heating overload protection with the new outer machine control heating overload protection, the new outer machine control heating overload protection is utilized to assist and supplement the traditional inner machine control heating overload protection, therefore, when the traditional inner machine control heating overload protection works normally, the control process of an outer machine is not increased, the operation load of an outer machine control panel is reduced, under the condition that an inner pipe temperature sensing bag can not work normally, the outer machine control heating overload protection is utilized to effectively protect a machine set, the hidden danger of heating overload protection caused by the abnormal occurrence of the inner pipe temperature sensing bag of the inner machine is avoided, and the reliability of the whole machine in the heating operation process is greatly increased.
In one embodiment, the step of detecting whether the bulb of the inner tube has failed comprises: acquiring an inner pipe temperature difference delta T2 sensed by an inner pipe temperature sensing bulb before and after the unit operates for T1 time; when the temperature difference delta T2 of the inner pipe is not equal to 0, judging that the temperature sensing package of the inner pipe does not lose efficacy; and when the temperature difference delta T2 of the inner pipe is =0, judging that the inner pipe thermal bulb is invalid.
When the traditional internal machine control heating overload protection is combined with the new external machine control heating overload protection, the specific implementation process of the heating overload protection method is as follows:
when the unit is started to operate, firstly, the operating state of the unit is judged, meanwhile, the temperature of a middle tube temperature sensing bulb on the current evaporator part of the unit is obtained in real time, and the indoor tube temperature sensing bulb is judged in real time,
when the temperature T of the indoor evaporator tube is less than or equal to n1 (n 1 is generally 54-56 ℃), the unit maintains the current heating operation state;
when the temperature n1 of the indoor evaporator tube is more than T and less than n2 (n 2 is generally 60-62 ℃), the temperature of the indoor evaporator tube is reduced by the unit through frequency limiting or frequency reduction.
When the temperature T of the indoor evaporator is more than or equal to n2 (n 2 is generally 60-62 ℃), the unit is shut down for protection.
When the inner tube temperature sensing bulb of the indoor heat exchanger 8 fails (no open circuit or short circuit) so that effective detection cannot be carried out, or the inner tube temperature sensing bulb of the indoor heat exchanger 8 is not inserted into the temperature sensing bulb sleeve and the tube temperature of the indoor heat exchanger 8 cannot be effectively detected, the next round of temperature judgment is automatically triggered; after T1 is operated (T1 generally takes a value of 3-4 min), the tube temperature of the indoor heat exchanger 8 after T1 time is further detected, the tube temperature difference delta T2 of the indoor heat exchanger 8 within T1 time is calculated, and judgment processing is carried out according to the following steps:
when the pipe temperature difference value delta T2 is not equal to 0, the condition that the pipe temperature sensing package of the evaporator is not failed or the pipe temperature sensing package of the evaporator is inserted into the pipe of the temperature sensing package is preliminarily judged, and the traditional method for controlling heating overload protection by the internal machine is maintained.
And when the pipe temperature difference value delta T2=0, preliminarily judging that the pipe temperature thermal bulb of the evaporator fails or the pipe temperature thermal bulb of the evaporator is not inserted into the thermal bulb sleeve, and detecting the outdoor air pipe temperature T gas, the liquid pipe temperature T liquid and the temperature difference delta T1 between the air pipe and the liquid pipe to enter an external machine thermal overload protection step.
Referring to fig. 3 and 4 in combination, according to an embodiment of the present invention, a heating overload protection apparatus is used to implement the above-described heating overload protection method, and the heating overload protection apparatus includes an outdoor unit 1, a first bulb 2 and a second bulb 3, the first bulb 2 is disposed on an air pipe of the outdoor unit 1, the second bulb 3 is disposed on a liquid pipe of the outdoor unit 1, the first bulb 2 is configured to sense a pipe temperature of the air pipe, and the second bulb 3 is configured to sense a pipe temperature of the liquid pipe.
The outdoor unit 1 includes a compressor 4, a throttling part 5, a four-way valve 6, and an outdoor heat exchanger 7, an air pipe is connected to an exhaust port of the compressor 4 through the four-way valve 6, and a liquid pipe is connected to the throttling part 5.
The outdoor unit 1 further comprises an outdoor unit main board, and the first temperature-sensing bulb 2 and the second temperature-sensing bulb 3 are in communication connection with the outdoor unit main board. In this embodiment, outdoor unit 1 includes outer quick-witted mainboard, first temperature sensing package 2 and second temperature sensing package 3 all with outer quick-witted mainboard communication connection, consequently in heating overload protection process, can shift the scheme that originally belongs to the on-program control of indoor unit to outer machine completely and control, reduced because the exception that leads to of interior outer quick-witted communication connection, the production of abnormal reliability has been avoided, the reliance of control software to the indoor unit has been reduced simultaneously, the mode that the realization outer machine can not pass through indoor unit program processing realizes the overload protection of heating.
According to an embodiment of the present invention, the air conditioner includes a heating overload protection device as described above and an indoor heat exchanger 8, wherein one end of the indoor heat exchanger 8 is connected to the throttling part 5 and the other end is connected to one port of the four-way valve 6.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in other sequences than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A method of thermal overload protection, comprising:
acquiring the unit operation mode, when the unit operates the heating mode,
acquiring the temperature T of an outdoor air pipe;
judging the relation between the T gas and the preset temperature;
when the judgment result meets a first preset condition, controlling the unit according to the judgment result;
when the judgment result meets the second preset condition,
obtaining the temperature Tliquid of the liquid pipe;
acquiring the temperature difference delta T1 between the air pipe and the liquid pipe;
and controlling the unit according to the delta T1.
2. The heating overload protection method according to claim 1, wherein when the judgment result satisfies a first preset condition, the step of controlling the unit according to the judgment result comprises:
when the T gas is less than or equal to N1, the unit is controlled to maintain the current heating operation state;
and when the gas is more than N1 and less than or equal to N2, controlling the unit to limit or reduce the frequency.
3. The heating overload protection method according to claim 2, wherein the second preset condition is Tgas > N2, and the step of controlling the unit according to Δ T1 comprises:
when the delta T1 is larger than or equal to N3, controlling the unit to limit or reduce the frequency;
and when the delta T1 is less than N3, controlling the unit to perform shutdown protection.
4. A heating overload protection method according to claim 1, wherein the step of obtaining the outdoor air pipe temperature T is directly entered when the unit is operating in the heating mode.
5. The heating overload protection method according to claim 1, wherein when the unit is in the heating mode, before entering the step of obtaining the outdoor air pipe temperature Tgas, the method further comprises:
obtaining the temperature T of the inner tube;
adjusting the running state of the unit according to the temperature T of the inner pipe;
when the number n1 in the T is less than or equal to n1, the unit maintains the current heating operation state;
when n1 is more than T and less than n2, controlling the unit to limit frequency or reduce frequency;
and when the T is more than or equal to n2, controlling the unit to carry out shutdown protection.
6. The heating overload protection method according to claim 5, wherein when the unit is in the heating mode, before entering the step of obtaining the outdoor air pipe temperature Tgas, the method further comprises:
detecting whether the inner pipe temperature sensing bulb is invalid or not;
when the inner pipe temperature sensing bulb is not invalid, the operation state of the unit is adjusted according to the temperature T of the inner pipe;
and when the inner pipe thermal bulb fails, the step of acquiring the temperature T of the outdoor air pipe is carried out.
7. The heating overload protection method of claim 6, wherein the step of detecting whether the bulb of the inner tube is failed comprises:
acquiring an inner pipe temperature difference delta T2 sensed by an inner pipe temperature sensing bulb before and after the unit operates for T1 time;
when the temperature difference delta T2 of the inner pipe is not equal to 0, judging that the temperature sensing bulb of the inner pipe does not lose efficacy;
and when the temperature difference delta T2 of the inner pipe is =0, judging that the inner pipe thermal bulb is invalid.
8. A heating overload protection apparatus for implementing the heating overload protection method according to any one of claims 1 to 7, the heating overload protection apparatus comprising an outdoor unit (1), a first bulb (2), and a second bulb (3), the first bulb (2) being disposed on a gas pipe of the outdoor unit (1), the second bulb (3) being disposed on a liquid pipe of the outdoor unit (1), the first bulb (2) being configured to sense a pipe temperature of the gas pipe, and the second bulb (3) being configured to sense a pipe temperature of the liquid pipe.
9. The heating overload protection apparatus according to claim 8, wherein the outdoor unit (1) includes a compressor (4), a throttling part (5), a four-way valve (6), and an outdoor heat exchanger (7), the air pipe is connected to an exhaust port of the compressor (4) through the four-way valve (6), and the liquid pipe is connected to the throttling part (5).
10. The heating overload protection device according to claim 8, wherein the outdoor unit (1) further comprises an outdoor unit main board, and the first thermal bulb (2) and the second thermal bulb (3) are both in communication connection with the outdoor unit main board.
11. An air conditioner comprising a heating overload protection apparatus, wherein the heating overload protection apparatus is the heating overload protection apparatus defined in any one of claims 8 to 10.
Priority Applications (1)
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