CN111397133A - Control method of multi-split air conditioner - Google Patents
Control method of multi-split air conditioner Download PDFInfo
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- CN111397133A CN111397133A CN202010245441.3A CN202010245441A CN111397133A CN 111397133 A CN111397133 A CN 111397133A CN 202010245441 A CN202010245441 A CN 202010245441A CN 111397133 A CN111397133 A CN 111397133A
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000013021 overheating Methods 0.000 abstract description 7
- 230000003247 decreasing effect Effects 0.000 description 20
- 239000003507 refrigerant Substances 0.000 description 11
- 238000004378 air conditioning Methods 0.000 description 4
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007788 liquid Substances 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
- F24F11/62—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
- F24F11/50—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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- General Engineering & Computer Science (AREA)
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- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the technical field of air conditioners and aims to solve the problem that an indoor unit of an existing multi-split air conditioner is prone to overheating faults. Therefore, the invention provides a control method of a multi-split air conditioner, the multi-split air conditioner comprises a plurality of indoor units, and the control method comprises the following steps: in the heating operation process of the multi-split air conditioner, when the indoor environment temperature reaches a first set temperature, the indoor unit enters a standby state and an electronic expansion valve of the indoor unit is adjusted to a set opening degree; acquiring the coil temperature of the indoor unit at preset time intervals; comparing the coil temperature of the indoor unit with a safe temperature; and selectively adjusting the electronic expansion valve of the indoor unit according to the comparison result. Through the arrangement, the coil temperature of the indoor unit is timely compared with the safe temperature, the temperature of the coil of the indoor unit can be prevented from exceeding the limit value, and the indoor unit can be prevented from overheating and failing.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly provides a control method of a multi-split air conditioner.
Background
The multi-split air conditioner is a type of air conditioner, commonly called as "one drags more", and refers to that one outdoor unit is connected with two or more indoor units through a pipe. The multi-split air conditioner is increasingly widely applied to small and medium-sized buildings and partial public buildings at present.
In the heating operation process of the multi-split air conditioner, when the indoor unit reaches a set temperature, the indoor unit enters a standby state, and the opening of the electronic expansion valve of the indoor unit is adjusted to a fixed value. However, since there is still refrigerant flowing in the indoor unit, the refrigerant in the air conditioning system will continuously flow into the indoor unit, and the temperature of the coil of the indoor unit will continuously rise to reach or even exceed the limit value of the coil, so that the indoor unit will overheat.
Therefore, there is a need in the art for a control method of a multi-split air conditioner to solve the above problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that the indoor units of the existing multi-split air conditioner are prone to overheat faults, the present invention provides a control method of a multi-split air conditioner, where the multi-split air conditioner includes a plurality of indoor units, and the control method includes: in the heating operation process of the multi-split air conditioner, when the indoor environment temperature reaches a first set temperature, the indoor unit enters a standby state and an electronic expansion valve of the indoor unit is adjusted to a set opening degree; acquiring the coil temperature of the indoor unit at preset time intervals; comparing the coil temperature of the indoor unit with a safe temperature; and selectively adjusting the electronic expansion valve of the indoor unit according to the comparison result.
In a preferred embodiment of the control method, the step of "selectively adjusting the electronic expansion valve of the indoor unit according to the comparison result" specifically includes: and if the temperature of the coil pipe of the indoor unit is higher than the safe temperature, reducing the opening degree of an electronic expansion valve of the indoor unit.
In a preferred embodiment of the control method, the step of "reducing the opening degree of the electronic expansion valve of the indoor unit" includes: and reducing the opening degree of an electronic expansion valve of the indoor unit according to a preset speed according to the difference value between the coil temperature of the indoor unit and the safe temperature.
In a preferred embodiment of the control method, the step of reducing the opening of the electronic expansion valve of the indoor unit at a preset speed according to the difference between the coil temperature of the indoor unit and the safety temperature specifically includes: if the difference value between the coil temperature of the indoor unit and the safety temperature is smaller than a first preset value, reducing the opening degree of an electronic expansion valve of the indoor unit according to a first preset speed; if the difference value between the coil temperature of the indoor unit and the safety temperature is greater than or equal to the first preset value and less than the second preset value, reducing the opening degree of an electronic expansion valve of the indoor unit according to a second preset speed; if the difference value between the coil temperature of the indoor unit and the safe temperature is greater than or equal to the second preset value, reducing the opening degree of an electronic expansion valve of the indoor unit according to a third preset speed; the first preset value is smaller than the second preset value, the second preset value is smaller than the third preset value, the first preset speed is smaller than the second preset speed, and the second preset speed is smaller than the third preset speed.
In a preferred technical solution of the above control method, the first preset value is 0.5, and the second preset value is 1.
In a preferred technical solution of the above control method, the first preset speed is 5 steps/second, the second preset speed is 10 steps/second, and the first preset speed is 15 steps/second.
In a preferred embodiment of the control method, the set opening is 50 steps.
In a preferable technical solution of the above control method, the preset time is 3 seconds.
In a preferred embodiment of the above control method, the step of "selectively adjusting the electronic expansion valve of the indoor unit according to the comparison result" further includes: and if the temperature of the coil pipe of the indoor unit is not greater than the safe temperature, the electronic expansion valve of the indoor unit is not adjusted.
In a preferred embodiment of the above control method, the control method further includes: and when the indoor environment temperature is reduced to a second set temperature, the indoor unit enters a normal working state, wherein the first set temperature is higher than the second set temperature.
As can be understood by those skilled in the art, in a preferred embodiment of the present invention, when the multi-split air conditioner is in a heating operation, after the indoor unit enters a standby state, the coil temperature of the indoor unit is obtained every preset time, and is compared with the safe temperature, and then the electronic expansion valve of the indoor unit is selectively adjusted according to the comparison result. Through the arrangement, the coil temperature of the indoor unit can be prevented from exceeding the limit value, and the indoor unit can be prevented from overheating and failing. Specifically, in a preferred case, when the coil temperature of the indoor unit is greater than the safety temperature, the opening degree of the electronic expansion valve of the indoor unit is decreased to decrease the flow rate of the refrigerant flowing into the indoor unit, thereby decreasing the coil temperature of the indoor unit, preventing the coil temperature of the indoor unit from exceeding its limit value, and thus enabling to prevent the indoor unit from overheating failure.
Further, the step of "reducing the opening degree of the electronic expansion valve of the indoor unit" specifically includes: and reducing the opening degree of an electronic expansion valve of the indoor unit according to a preset speed according to the difference value between the coil temperature and the safe temperature of the indoor unit. Through the arrangement, the opening degree of the electronic expansion valve of the indoor unit is reduced at different speeds according to the difference value between the coil temperature and the safety temperature of the indoor unit, and the influence of the reduction of the opening degree of the electronic expansion valve on the system pressure is reduced as much as possible on the basis of ensuring that the coil temperature of the indoor unit does not exceed the limit value. Specifically, decreasing the opening degree of the electronic expansion valve may increase the flow rate of the refrigerant in the other pipelines, and when the increment of the refrigerant in the other pipelines is large, the pressure of the air conditioning system may be too high, thereby affecting the normal operation of the air conditioner. In a preferred case, when the difference between the coil temperature of the indoor unit and the safety temperature is less than the first preset value, it indicates that the coil temperature of the indoor unit slightly exceeds the safety temperature, in this case, the opening degree of the electronic expansion valve may be decreased at the first preset speed, that is, the opening degree of the electronic expansion valve may be decreased at a slower speed, and if the opening degree of the electronic expansion valve is decreased at a faster speed, although the judged temperature of the indoor unit may also be decreased, the increase of the refrigerant in other pipelines may be too large due to the too small opening degree of the electronic expansion valve, thereby causing the pressure of the air conditioning system to be too high; when the difference value between the coil temperature of the indoor unit and the safety temperature is greater than or equal to a first preset value and less than a second preset value, it is indicated that the coil temperature of the indoor unit moderately exceeds the safety temperature, in this case, the opening degree of the electronic expansion valve can be reduced according to a second preset speed, that is, the opening degree of the electronic expansion valve is reduced according to a medium speed, if the opening degree of the electronic expansion valve is reduced according to a slower speed, only the increasing speed of the coil temperature of the indoor unit can be slowed down, the coil temperature of the indoor unit can be continuously increased, so that the limit value of the coil temperature is exceeded, and in addition, if the opening degree of the electronic expansion valve is reduced according to a faster speed, although the judgment temperature of the indoor unit can be reduced, the opening degree of the electronic expansion valve is too small, so that the increment of refrigerants in; when the difference value between the coil temperature of the indoor unit and the safety temperature is greater than or equal to a second preset value, it is indicated that the coil temperature of the indoor unit heavily exceeds the safety temperature, in this case, the opening degree of the electronic expansion valve should be reduced at a third preset speed, that is, the opening degree of the electronic expansion valve is reduced at a faster speed, and if the opening degree of the electronic expansion valve is reduced at a slower speed, the increase speed of the coil temperature of the indoor unit can only be slowed down, and the coil temperature of the indoor unit continues to increase, so that the coil temperature exceeds the limit value.
Further, the control method of the present invention further includes: when the indoor environment temperature is reduced to a second set temperature, the indoor unit enters a normal working state, wherein the first set temperature is higher than the second set temperature. Through the arrangement, the use experience of the user can be improved. Specifically, after the indoor unit enters the standby state, the indoor environment temperature of the room where the indoor unit is located is continuously detected, when the indoor environment temperature is reduced to the second set temperature, the temperature of the room is low, at the moment, the indoor unit enters the normal working state, the temperature of the room can be increased, and therefore the use experience of a user can be improved.
Drawings
Fig. 1 is a schematic view of a multi-split air conditioner of the present invention;
FIG. 2 is a flow chart of a control method of the present invention;
fig. 3 is a flow chart of an embodiment of the control method of the present invention.
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.
The problem that the indoor unit of the existing multi-split air conditioner is easy to have overheating fault is pointed out based on the background technology. The invention provides a control method of a multi-split air conditioner, aiming at preventing the coil temperature of an indoor unit from being overhigh so as to avoid the overheating fault of the indoor unit.
Specifically, as shown in fig. 1, the multi-split air conditioner of the present invention includes an outdoor unit 1 and a plurality of indoor units 2, the outdoor unit includes a compressor 11, a four-way valve 12, a condenser 13, a gas-liquid separator 14, and the like, in a possible embodiment, the number of the indoor units 2 is three, and the indoor units are a first indoor unit 2A, a second indoor unit 2B, and a third indoor unit 2C, the first indoor unit 2A, the second indoor unit 2B, and the third indoor unit 2C are respectively installed in different rooms, the first indoor unit 2A includes a first electronic expansion valve 2A1, the second indoor unit 2B includes a second electronic expansion valve 2B1, and the third indoor unit 2C includes a third electronic expansion valve 2C 1.
As shown in fig. 2, the control method of the present invention includes: in the heating operation process of the multi-split air conditioner, when the indoor environment temperature reaches a first set temperature, the indoor unit enters a standby state and an electronic expansion valve of the indoor unit is adjusted to a set opening degree; acquiring the coil temperature T of the indoor unit at preset intervalsC(ii) a The coil temperature T of the indoor unitCAnd a safety temperature T0Comparing; and selectively adjusting the electronic expansion valve of the indoor unit according to the comparison result.
In the process of multi-split air conditioner heat operation, the temperature in a room, namely the indoor environment temperature, is detected through a temperature sensor, when the indoor environment temperature reaches a first set temperature, an indoor unit in the room is enabled to enter a standby state, an electronic expansion valve of the indoor unit is enabled to be adjusted to a set opening degree, after the indoor unit enters the standby state, air is not supplied to the indoor unit any more, so that the condition that the temperature in the room is continuously increased to affect the comfort level in the room is avoided, the electronic expansion valve is adjusted to the set opening degree instead of being completely closed, the condition that the normal operation of the multi-split air conditioner is affected due to overhigh pressure of an air conditioning system can be avoided, specifically, if the electronic expansion valve of the indoor unit is completely closed, the refrigerant cannot flow through the indoor unit any more, the refrigerant in.
The method comprises the steps that after an indoor unit enters a standby state and an electronic expansion valve of the indoor unit is adjusted to a set opening degree, the temperature T of a coil pipe of the indoor unit is obtained at preset time intervalsCAnd the coil temperature T of the indoor unitCAnd a safety temperature T0Specifically, as can be seen from the above, although air is not blown again after the indoor unit enters the standby state, the refrigerant also flows through the indoor unit, causing the temperature of the coil of the indoor unit to rise continuously, and if the temperature of the coil exceeds the tolerance limit, causing the temperature of the indoor unit to rise continuouslyThe overheat failure of the indoor unit is obtained by acquiring the coil temperature T of the indoor unitCAnd the coil temperature T of the indoor unitCAnd a safety temperature T0And comparing, and selectively adjusting the electronic expansion valve according to the comparison result, so that the temperature of the coil of the indoor unit can be prevented from exceeding the limit value, and the overheating fault of the indoor unit can be prevented.
The control method of the present invention will be described in detail below with reference to fig. 1 and 3, taking the first indoor unit 2A as an example.
As shown in fig. 1 and 3, during heating operation of the multi-split air conditioner, the indoor ambient temperature of the room where the first indoor unit 2A is located is collected by the temperature sensor, when the indoor ambient temperature reaches a first set temperature, the first indoor unit 2A enters a standby state, the first electronic expansion valve 2A1 is adjusted to a set opening, and the coil temperature T of the first indoor unit 2A is obtained at preset intervalsCThe coil temperature T of the first indoor unit 2ACAnd a safety temperature T0Comparing if the coil temperature T of the first indoor unit 2ACAbove a safe temperature T0Then, the opening degree of the first electronic expansion valve 2a1 is decreased; if the coil temperature T of the first indoor unit 2A is highCNot higher than the safety temperature T0The first electronic expansion valve 2a1 is not adjusted.
When the coil temperature T of the first indoor unit 2ACAbove a safe temperature T0When is at TC＞T0The coil temperature T of the first indoor unit 2A will be describedCIf the temperature is too high, the opening degree of the first electronic expansion valve 2A1 needs to be decreased to decrease the flow rate of the refrigerant flowing into the first indoor unit 2A, thereby lowering the coil temperature T of the first indoor unit 2ACThe temperature of the coil of the first indoor unit 2A is prevented from exceeding its limit value.
Wherein, the temperature T of the coil pipe of the first indoor machine 2A can be determinedCAnd a safety temperature T0The first electronic expansion valve 2A1 is adjusted by the difference, or the coil temperature T of the first indoor unit 2A may be adjusted according to the differenceCRelative to the safety temperature T0The first electronic expansion valve 2a1 is adjusted according to the rate of change of the pressure, or further alternatively, according to the proximityTwice acquired coil temperature T of the first indoor unit 2ACThe adjustment of the first electronic expansion valve 2a1, etc., and such flexible adjustment and change without departing from the spirit and scope of the present invention should be limited within the scope of the present invention.
When the coil temperature T of the first indoor unit 2ACNot higher than the safety temperature T0When is at TC≤T0The coil temperature T of the first indoor unit 2A will be describedCWithin the safety range, there is no need to adjust the first electronic expansion valve 2a1, even though the first electronic expansion valve 2a1 maintains the current opening degree.
The first set temperature is a temperature set by the user according to the preference of the user.
In addition, it should be noted that, in practical applications, those skilled in the art may set the opening degree and the safety temperature T according to experiments or experience0The specific numerical value of (1).
Preferably, the step of "decreasing the opening degree of the first electronic expansion valve 2a 1" specifically includes: according to the coil temperature T of the first indoor unit 2ACAnd a safety temperature T0The opening degree of the first electronic expansion valve 2a1 is decreased at a preset speed by the difference Δ T of (a). Further preferably, "according to the coil temperature T of the first indoor unit 2ACAnd a safety temperature T0The step of decreasing the opening degree of the first electronic expansion valve 2a1 at the preset speed "specifically includes: if the coil temperature T of the first indoor unit 2A is highCAnd a safety temperature T0Is less than a first predetermined value K1According to a first preset speed V1Decreasing the opening degree of the first electronic expansion valve 2a 1; if the coil temperature T of the first indoor unit 2A is highCAnd a safety temperature T0Is greater than or equal to a first preset value K1And is less than a second predetermined value K2According to a second preset speed V2Decreasing the opening degree of the first electronic expansion valve 2a 1; if the coil temperature T of the first indoor unit 2A is highCAnd a safety temperature T0Is greater than or equal to a second preset value K2According to a third preset speed V3Reducing first electron expansionOpening degree of the expansion valve 2a 1; wherein the first preset value K1Less than a second predetermined value K2Second preset value K2Less than a third predetermined value, a first predetermined speed V1Less than a second predetermined speed V2Second predetermined speed V2Less than a third predetermined speed V3。
When the coil temperature T of the first indoor unit 2ACAnd a safety temperature T0Is less than a first predetermined value K1When Δ T < K1The coil temperature T of the first indoor unit 2A will be describedCSlight excess of safety temperature T0In this case, the first preset speed V may be followed1The opening degree of the first electronic expansion valve 2a1 is decreased, that is, the opening degree of the first electronic expansion valve 2a1 is decreased at a slower speed.
When the coil temperature T of the first indoor unit 2ACAnd a safety temperature T0Is greater than or equal to a first preset value K1And is less than a second predetermined value K2When K is1≤ΔT＜K2The coil temperature T of the first indoor unit 2A will be describedCModerate over-safety temperature T0In this case, the second preset speed V may be followed2The opening degree of the first electronic expansion valve 2a1 is decreased, that is, the opening degree of the first electronic expansion valve 2a1 is decreased at an intermediate speed.
When the coil temperature T of the first indoor unit 2ACAnd a safety temperature T0Is greater than or equal to a second preset value K2When K is2When the temperature is less than or equal to delta T, the temperature T of the coil pipe of the first indoor unit 2A is explainedCSevere excess safety temperature T0In this case, the third preset speed V should be followed3The opening degree of the first electronic expansion valve 2a1 is decreased, that is, the opening degree of the first electronic expansion valve 2a1 is decreased at a faster rate.
In a preferred case, the opening degree is set to 50 steps; the preset time is 3 seconds; first preset value K1Is 0.5, the second preset value K2Is 1; first preset speed V1At 5 steps/second, a second preset speed V210 steps/second, third preset speed V3Is 15 steps/second. When the multi-split air conditioner is in heating operation, the indoor environment temperature of the room where the first indoor unit 2A is located is acquired through the temperature sensor, when the indoor environment temperature reaches a first set temperature, the first indoor unit 2A enters a standby state, the first electronic expansion valve 2A1 is adjusted to 50 steps, and the coil temperature T of the first indoor unit 2A is acquired every 3 secondsCThe coil temperature T of the first indoor unit 2ACAnd a safety temperature T0Comparing, and determining the temperature T of the coil in the first roomCNot higher than the safety temperature T0When is at TC≤T0When the coil temperature T of the first indoor unit 2A is reached, the first electronic expansion valve 2A1 is not adjusted even if the current opening degree of the first electronic expansion valve 2A1 is maintainedCAbove a safe temperature T0When is at TC＞T0Then, the coil temperature T of the first indoor unit 2A is calculatedCAnd a safety temperature T0When the coil temperature T of the first indoor unit 2A is reachedCAnd a safety temperature T0When the difference Δ T is less than 0.5, that is, when Δ T < 0.5, the opening degree of the first electronic expansion valve 2A1 is decreased at a rate of 5 steps/second, when the coil temperature T of the first indoor unit 2A is lower thanCAnd a safety temperature T0When the difference value delta T is greater than or equal to 0.5 and less than 1, namely when delta T is greater than or equal to 0.5 and less than 1, the opening degree of the first electronic expansion valve 2A1 is reduced according to the speed of 10 steps/second, and when the coil temperature T of the first indoor unit 2A is higher than the threshold value delta TCAnd a safety temperature T0When the difference Δ T is greater than or equal to 1, i.e., when 1 ≦ Δ T, the opening degree of the first electronic expansion valve 2a1 is decreased at a speed of 15 steps/sec.
It should be noted that the adjustment of the opening of the electronic expansion valve is generally calculated in steps, and since the adjustment structure of the electronic expansion valve is a stepping motor, the minimum angle range of the rotation of the stepping motor is called one step.
Note that the coil temperature T in the first roomCNot higher than the safety temperature T0In the case of (2), the coil temperature T of the first indoor unit 2A needs to be obtained every preset timeC(ii) a Coil temperature T in the first indoor unit 2ACLess than the safety temperature T0In the case of (1), it is necessary toThe opening degree of the first electronic expansion valve 2A1 is reduced, and in this process, the coil temperature T of the first indoor unit 2A needs to be acquired at preset time intervalsCIf the newly acquired coil temperature T of the first indoor unit 2A is reachedCIs no longer greater than the safety temperature T0If the coil temperature T of the first indoor unit 2A is newly obtained, the first electronic expansion valve 2A1 is no longer adjusted, even if the first electronic expansion valve 2A1 keeps the current opening degreeCOr above the safety temperature T0And then according to the newly acquired coil temperature T of the first indoor unit 2ACAnd a safety temperature T0Is selected according to a first preset speed V1A second preset speed V2Or a third preset speed V3The opening degree of the electronic expansion valve is reduced.
Preferably, the control method of the present invention further comprises: when the indoor ambient temperature is reduced to a second set temperature, the first indoor unit 2A enters a normal working state, wherein the first set temperature is greater than the second set temperature.
After the first indoor unit 2A enters the standby state, the indoor ambient temperature of the room where the first indoor unit 2A is located is continuously detected, and when the indoor ambient temperature is reduced to the second set temperature, it is indicated that the temperature of the room is low, at this time, the first indoor unit 2A needs to enter the normal operating state to raise the temperature of the room.
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 control method of a multi-split air conditioner, which comprises a plurality of indoor units, is characterized by comprising the following steps:
in the heating operation process of the multi-split air conditioner, when the indoor environment temperature reaches a first set temperature, the indoor unit enters a standby state and an electronic expansion valve of the indoor unit is adjusted to a set opening degree;
acquiring the coil temperature of the indoor unit at preset time intervals;
comparing the coil temperature of the indoor unit with a safe temperature;
and selectively adjusting the electronic expansion valve of the indoor unit according to the comparison result.
2. The control method according to claim 1, wherein the step of selectively adjusting the electronic expansion valve of the indoor unit according to the comparison result specifically comprises:
and if the temperature of the coil pipe of the indoor unit is higher than the safe temperature, reducing the opening degree of an electronic expansion valve of the indoor unit.
3. The control method according to claim 2, wherein the step of reducing the opening degree of the electronic expansion valve of the indoor unit specifically includes:
and reducing the opening degree of an electronic expansion valve of the indoor unit according to a preset speed according to the difference value between the coil temperature of the indoor unit and the safe temperature.
4. The control method according to claim 3, wherein the step of reducing the opening degree of the electronic expansion valve of the indoor unit at a preset speed according to the difference between the coil temperature of the indoor unit and the safety temperature specifically comprises:
if the difference value between the coil temperature of the indoor unit and the safety temperature is smaller than a first preset value, reducing the opening degree of an electronic expansion valve of the indoor unit according to a first preset speed;
if the difference value between the coil temperature of the indoor unit and the safety temperature is greater than or equal to the first preset value and less than a second preset value, reducing the opening degree of an electronic expansion valve of the indoor unit according to a second preset speed;
if the difference value between the coil temperature of the indoor unit and the safe temperature is greater than or equal to the second preset value, reducing the opening degree of an electronic expansion valve of the indoor unit according to a third preset speed;
the first preset value is smaller than the second preset value, the second preset value is smaller than the third preset value, the first preset speed is smaller than the second preset speed, and the second preset speed is smaller than the third preset speed.
5. The control method according to claim 4, wherein the first preset value is 0.5, and the second preset value is 1.
6. The control method according to claim 5, characterized in that the first preset speed is 5 steps/sec, the second preset speed is 10 steps/sec, and the third preset speed is 15 steps/sec.
7. The control method according to claim 1, wherein the set opening degree is 50 steps.
8. The control method according to claim 1, wherein the preset time is 3 seconds.
9. The control method according to claim 2, wherein the step of selectively adjusting the electronic expansion valve of the indoor unit according to the comparison result further comprises:
and if the temperature of the coil pipe of the indoor unit is not greater than the safe temperature, the electronic expansion valve of the indoor unit is not adjusted.
10. The control method according to any one of claims 1 to 9, characterized by further comprising:
and when the indoor environment temperature is reduced to a second set temperature, enabling the indoor unit to enter a normal working state, wherein the second set temperature is lower than the first set temperature.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112797599A (en) * | 2020-12-30 | 2021-05-14 | 宁波奥克斯电气股份有限公司 | Multi-split air conditioner electronic expansion valve opening control method, adjusting device and air conditioner system |
| CN114076391A (en) * | 2020-08-17 | 2022-02-22 | 广东美的制冷设备有限公司 | Multi-split air conditioner, control method thereof, air conditioner control device and readable storage medium |
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