CN111609519A

CN111609519A - Controller, air-conditioning floor heating system and anti-freezing control method thereof

Info

Publication number: CN111609519A
Application number: CN202010500004.1A
Authority: CN
Inventors: 王鹏帅
Original assignee: Ningbo Aux Electric Co Ltd; Ningbo Aux Intelligent Commercial Air Conditioning Manufacturing Co Ltd
Current assignee: Aux Air Conditioning Co Ltd; Ningbo Aux Electric Co Ltd
Priority date: 2020-06-04
Filing date: 2020-06-04
Publication date: 2020-09-01
Anticipated expiration: 2040-06-04
Also published as: CN111609519B

Abstract

The embodiment of the invention provides a controller, an air-conditioning floor heating system and an anti-freezing control method thereof, and relates to the technical field of air conditioners. The anti-freezing control method of the air-conditioning floor heating system comprises the following steps: acquiring the temperature Tci of a liquid pipe of the water module and acquiring the temperature Tco of an air pipe of the water module; and if Tci is less than or equal to a first preset value and Tco is less than or equal to a second preset value, controlling the floor heating system of the air conditioner to enter an anti-freezing mode. Through obtaining water module liquid pipe temperature Tci and obtaining water module trachea temperature Tco, through the comparison of two temperatures and default, if satisfy Tci and be less than or equal to first default, and, Tco is less than or equal to the second default, then explain that the electronic expansion valve of this moment has the phenomenon of revealing, if evaporating temperature is less than the freezing point after the refrigerant is revealed, the water in the water module can appear the phenomenon of freezing inflation, get into the mode of preventing frostbite through control air conditioner underfloor heating system, can improve the temperature of water in the water module, and then can reduce the risk that the water module is frozen out.

Description

Controller, air-conditioning floor heating system and anti-freezing control method thereof

Technical Field

The invention relates to the technical field of air conditioners, in particular to a controller, an air conditioner floor heating system and an anti-freezing control method of the controller.

Background

The air-conditioning floor heating system can be generally understood as a multi-connected combined system of an outdoor unit, an indoor unit and a floor heating module. The air conditioner is used for refrigerating in summer, and the floor heating is used for heating in winter (or the air conditioner is used for heating). Generally, when an air conditioner refrigerates in summer, a water module of a floor heating module is in a closed state, an electronic expansion valve of the water module is also in a closed state, but in an actual refrigerating process, the electronic expansion valve is often leaked due to the fact that the electronic expansion valve is clamped, out of step, coils are loosened and the like, and further a refrigerant is leaked.

If the evaporating temperature is lower than the freezing point after the refrigerant leaks, the water in the water module freezes and expands, and the risk of freezing the water module is existed.

Disclosure of Invention

The problem solved by the invention is how to reduce the risk of freezing the water module.

In order to solve the above problems, in a first aspect, the present invention provides an anti-freezing control method for a floor heating system of an air conditioner, including:

acquiring the temperature Tci of a liquid pipe of the water module and acquiring the temperature Tco of an air pipe of the water module;

and if Tci is less than or equal to a first preset value and Tco is less than or equal to a second preset value, controlling the floor heating system of the air conditioner to enter an anti-freezing mode.

Through obtaining water module liquid pipe temperature Tci and obtaining water module trachea temperature Tco, through the comparison of two temperatures and default, if satisfy Tci and be less than or equal to first default, and, Tco is less than or equal to the second default, then explain that the electronic expansion valve of this moment has the phenomenon of revealing, can predict ground, if evaporating temperature is less than the freezing point after the refrigerant is revealed, the water in the water module can appear the phenomenon of the inflation that freezes, consequently, get into the mode of preventing frostbite through controlling air conditioner underfloor heating, can improve the temperature of water in the water module, and then can reduce the risk that the water module is frozen out.

Optionally, the water module liquid pipe temperature Tci is an average temperature value of the water module liquid pipe temperature within a first preset duration, or the water module liquid pipe temperature Tci is a maximum temperature value of the water module liquid pipe temperature within the first preset duration;

and the water module air pipe temperature Tco is an average temperature value of the water module air pipe temperature within a second preset duration, or the water module air pipe temperature Tco is a maximum temperature value of the water module air pipe temperature within the second preset duration.

The value can accurately reflect the temperature of the liquid pipe of the water module and the temperature of the air pipe of the water module relatively, and the control reliability of the whole system can be improved.

Optionally, the first preset value is less than or equal to 5 ℃ at the temperature of 3 ℃; the second preset value is more than or equal to 3 ℃ and less than or equal to 5 ℃.

The value can accurately reflect the leakage condition of the electronic expansion valve, and the control reliability of the whole system can be improved.

Optionally, before the step of obtaining the water module liquid pipe temperature Tci and the water module gas pipe temperature Tco, the anti-freeze control method further includes:

and controlling the air-conditioning floor heating system to start in a refrigerating mode, and continuously operating a compressor of the air-conditioning floor heating system for a third preset time.

By the control, corresponding temperature detection can be carried out after the compressor operates stably, so that the control accuracy of the whole system can be improved.

Optionally, the step of controlling the floor heating system of the air conditioner to enter the anti-freezing mode includes:

controlling an electronic expansion valve of the air-conditioning floor heating system to open a step A, and controlling an electronic expansion valve to close b step A after a fourth preset time period, so that the electronic expansion valve is reset;

wherein a is more than 0 and less than 1, b is more than 1, and A is the maximum step number of the electronic expansion valve.

By means of opening and closing the electronic expansion valve, errors can be reduced, and the situation that the electronic expansion valve can be closed in theory and is not closed actually due to valve closing errors is avoided.

Optionally, the step of controlling the floor heating system of the air conditioner to enter the anti-freezing mode further includes:

after the electronic expansion valve is reset for the fifth preset time, acquiring the temperature Tci of a liquid pipe of the water module again and acquiring the temperature Tco of an air pipe of the water module, if the temperature Tci is not more than the first preset value and Tco is not more than the second preset value, controlling the electronic expansion valve to open a step A again, and controlling the electronic expansion valve to close b step A after the fourth preset time;

and if Tci is not satisfied and is not more than a first preset value and Tco is not more than a second preset value, controlling the floor heating system of the air conditioner to exit the anti-freezing mode.

It can be understood that after the electronic expansion valve is reset for the fifth preset time, the electronic expansion valve theoretically stops leaking, in order to reduce errors, the temperature Tci of the liquid pipe of the water module and the temperature Tco of the air pipe of the water module can be obtained again, if the temperature Tci is smaller than or equal to the first preset value and the temperature Tco is smaller than or equal to the second preset value at the moment, it is indicated that the electronic expansion valve is not closed, and the probability of leaking of the electronic expansion valve can be reduced by controlling the electronic expansion valve again to perform reset operation. Meanwhile, if Tci is not more than or equal to a first preset value and Tco is not more than or equal to a second preset value, the leakage of the electronic expansion valve is effectively controlled, and the floor heating system of the air conditioner can be controlled to exit the anti-freezing mode, so that electric energy can be saved.

after the electronic expansion valve is reset for the sixth preset time, acquiring the temperature Tci of a liquid pipe of the water module again and the temperature Tco of an air pipe of the water module again, and starting a circulating water pump of the air-conditioning floor heating system if the temperature Tci is not more than a first preset value and the temperature Tco is not more than a second preset value;

if Tci is not satisfied and is not more than a first preset value and Tco is not more than a second preset value, controlling the floor heating system of the air conditioner to exit the anti-freezing mode;

wherein the sixth preset time is longer than the fifth preset time.

It can be understood that after the electronic expansion valve is reset for the sixth preset time, theoretically, the electronic expansion valve stops leaking, in order to reduce errors, the temperature Tci of the liquid pipe of the water module can be obtained again, the temperature Tco of the air pipe of the water module can be obtained, if the temperature Tci is smaller than or equal to the first preset value and the temperature Tco is smaller than or equal to the second preset value at the moment, it is indicated that the electronic expansion valve is not closed, and the effect of resetting the electronic expansion valve is relatively unsatisfactory, therefore, the circulating water pump of the air-conditioning floor heating system is started, so that the cold quantity in the water module can be taken away when the circulating water pump runs, and the temperature in the water module is prevented from continuously dropping. Meanwhile, if Tci is not satisfied to be less than or equal to the first preset value and Tco is not less than or equal to the second preset value, the temperature in the water module is effectively controlled at the moment, the floor heating system of the air conditioner can be controlled to exit the anti-freezing mode, and therefore electric energy can be saved.

Optionally, the step of starting the circulating water pump of the air-conditioning floor heating system includes:

starting the circulating water pump to operate at an L1 gear, and acquiring the water outlet temperature Two of the water module after a seventh preset time;

and controlling the circulating water pump to operate at a corresponding gear according to the value of the Two.

The gear of the circulating water pump is correspondingly controlled by the value of Two, so that the electric energy can be saved while effective control can be performed.

Optionally, the step of controlling the circulating water pump to operate in a corresponding gear comprises:

if the Two is larger than or equal to a third preset value, controlling the circulating water pump to continuously operate at an L1 gear;

if the fourth preset value is not more than Two and is less than the third preset value, controlling the circulating water pump to operate at an L2 gear;

if the fifth preset value is larger than Two and smaller than the fourth preset value, controlling the circulating water pump to operate at an L3 gear;

if the Two is less than or equal to a fifth preset value, controlling the circulating water pump to operate at an L3 gear, and starting an electric heating unit of the air-conditioning floor heating system;

wherein the fifth preset value is less than the fourth preset value and less than the third preset value.

It is understood that the circulation water pump may be controlled to operate in the low gear if the value of Two is relatively high, in the middle gear if the value of Two is relatively medium, and in the high gear if the value of Two is relatively low. Therefore, the temperature of the water module can be effectively controlled, and electric energy can be saved. Of course, if the value of Two is too low, it indicates that the temperature of the water module cannot be effectively controlled by starting the circulating water pump, and at this time, by starting the electric heating unit of the air-conditioning floor heating system, the temperature of the water module can be further assisted to be increased by the heating function of the electric heating unit.

Optionally, the step of starting the electric heating unit of the air-conditioning floor heating system includes:

starting the electric heating unit to operate at a gear N1, and controlling the electric heating unit to operate at a corresponding gear according to delta T;

wherein, Δ T ═ Two(s) — Two (s-n), Two(s) is the water module outlet temperature value obtained at s moment, Two (s-n) is the water module outlet temperature value obtained at n min before s moment, or Two (s-n) is the average temperature value of the water module outlet temperature obtained at n min before s moment;

wherein n is a sixth preset value.

The gear of the electric heating unit is correspondingly controlled by delta T, so that the electric energy can be saved while effective control is realized.

Optionally, the step of controlling the electric heating unit to operate in the corresponding gear according to Δ T includes:

if delta T is larger than 0 after the eighth preset time period, controlling the electric heating unit to continuously operate at the N1 gear;

if delta T is less than or equal to 0 after the ninth preset duration, controlling the electric heating unit to continuously operate at the N2 gear;

after the electric heating unit continuously operates for a tenth preset time at a N2 gear, if the delta T is larger than or equal to 0, controlling the electric heating unit to continuously operate at a N2 gear, and if the delta T is smaller than 0, controlling the electric heating unit to operate at a N3 gear;

and if the Two is larger than or equal to the fourth preset value, closing the electric heating unit.

It can be understood that if Δ T is greater than 0 in the eighth preset time period, the electric heating unit may be controlled to operate at the low gear, if Δ T is less than or equal to 0 in the ninth preset time period, the electric heating unit may be controlled to operate at the medium gear, after the electric heating unit continuously operates at the N2 gear for the tenth preset time period, if Δ T is greater than or equal to 0, the electric heating unit may be controlled to continue to operate at the medium gear, and if Δ T is less than 0, the electric heating unit may be controlled to operate at the high gear. Therefore, the temperature of the water module can be effectively controlled, and electric energy can be saved. Of course, if Two is greater than or equal to the fourth preset value, it indicates that the temperature of the water module can be effectively controlled by starting the circulating water pump and the electric heating unit, and at this time, the electric heating unit is turned off, so that the energy consumption can be reduced.

Optionally, the antifreeze control method further includes:

and if a stop signal of a compressor of the air-conditioning floor heating system is acquired, or the air-conditioning floor heating system is switched to a heating mode, or the air-conditioning floor heating system is acquired to be in a single air outlet mode, controlling the air-conditioning floor heating system not to enter the anti-freezing mode.

When the compressor is stopped, the air-conditioning floor heating system is switched to a heating mode or the air-conditioning floor heating system is in a single air outlet mode, the risk that the water module is frozen is relatively low, and the air-conditioning floor heating system can be controlled not to enter an anti-freezing mode so as to save electric energy.

Optionally, the antifreeze control method further includes:

after the air-conditioning floor heating system is controlled to enter the anti-freezing mode, if Tci is larger than a first preset value or Tco is larger than a second preset value within continuous eleventh preset time, the air-conditioning floor heating system is controlled to exit the anti-freezing mode.

It can be understood that if Tci is greater than the first preset value or Tco is greater than the second preset value within the continuous eleventh preset time, it indicates that the temperature of the water module is relatively proper at the time and the risk of being frozen is relatively low, and the air-conditioning floor heating system can be controlled to exit the anti-freezing mode so as to save electric energy.

In a second aspect, the invention further provides a controller, and the controller is used for executing the anti-freezing control method for the floor heating system of the air conditioner in the first aspect.

The technical effect brought by the controller is similar to that of the anti-freezing control method of the floor heating system of the air conditioner, and is not described again here.

In a third aspect, the invention further provides an air-conditioning floor heating system, which comprises an outdoor unit, an indoor unit, a floor heating module and the controller in the second aspect;

the floor heating module and the indoor unit are both connected with the outdoor unit;

the water module liquid pipe of the floor heating module is provided with a water module liquid pipe temperature sensor, the water module air pipe of the floor heating module is provided with a water module air pipe temperature sensor, and the water module liquid pipe temperature sensor and the water module air pipe temperature sensor are communicated with the controller.

The technical effect brought by the air-conditioning floor heating system is similar to that of the controller, and is not described herein again.

Drawings

Fig. 1 is a schematic structural diagram of an air-conditioning floor heating system provided by an embodiment of the invention;

fig. 2 is a control block diagram of an air-conditioning floor heating system provided by the embodiment of the invention;

fig. 3 is a schematic diagram of an anti-freezing control method for a floor heating system of an air conditioner provided by the embodiment of the invention;

fig. 4 is a schematic diagram illustrating the sub-steps of S200 in fig. 3.

100-an air-conditioning floor heating system; 101-an air conditioning circulation loop; 102-ground heating external circulation loop; 103-floor heating internal circulation loop; 10-an outdoor unit; 11-a compressor; 12-a fan; 20-an indoor unit; 30-a floor heating module; 31-a water module; 32-an electronic expansion valve; 33-water module liquid pipe temperature sensor; 34-water module air pipe temperature sensor; 35-a circulating water pump; 36-an electrical heating unit; 37-water module outlet water temperature sensor; 38-floor heating coil; 41-a first conduit; 42-a second conduit; 43-third conduit; 44-a fourth conduit; 45-fifth pipeline; 46-a sixth conduit; 47-seventh conduit; 48-eighth line; 49-ninth conduit; 50-tenth conduit; and 60, a controller.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

With the improvement of life quality of people, the comfort requirements of people on air conditioner refrigeration and heating are higher and higher, and when a common air conditioner heats, hot air does not come, so that the air is dry, the blowing feeling is strong, and the comfort is poor; the pure water module has good heating effect but poor refrigerating effect. A combination of a normal air conditioner and a water module is thus created, which may be referred to as an air-conditioned floor heating system.

If the evaporating temperature is lower than the freezing point after the refrigerant leaks, the water in the water module freezes and expands, and the risk of freezing the water module is existed. The controller, the air-conditioning floor heating system and the anti-freezing control method thereof can effectively alleviate the technical problem.

Referring to fig. 1, the present embodiment provides an air-conditioning floor heating system 100, which includes an outdoor unit 10, an indoor unit 20, a floor heating module 30, and a controller 60. The floor heating module 30 and the indoor unit 20 are connected to the outdoor unit 10.

In this embodiment, an air conditioning circulation loop 101 is formed between the outdoor unit 10 and the indoor unit 20, a floor heating external circulation loop 102 is formed between the floor heating module 30 and the outdoor unit 10, and a floor heating internal circulation loop 103 is formed inside the floor heating module 30.

Specifically, referring to fig. 1, in the floor heating system with air conditioning 100 in fig. 1, when in the cooling mode, the outdoor unit 10 and the indoor unit 20 are connected through the first pipeline 41, the second pipeline 42, the third pipeline 43 and the tenth pipeline 50, and the medium flowing between the outdoor unit 10 and the indoor unit 20 is the first medium (cooling medium or heating medium). That is, the medium flowing in the air-conditioning circulation circuit 101 is the first medium, and as shown in fig. 1, the direction of the arrow in the air-conditioning circulation circuit 101 can be understood as the flowing direction of the first medium in the air-conditioning circulation circuit 101, and the outdoor unit 10, the tenth pipe 50, the third pipe 43, the indoor unit 20, the second pipe 42, and the first pipe 41 are sequentially connected end to end in the flowing direction of the first medium in the air-conditioning circulation circuit 101.

Specifically, the floor heating module 30 includes a fourth pipeline 44, a fifth pipeline 45, a sixth pipeline 46, a water module 31, a seventh pipeline 47, an eighth pipeline 48, a ninth pipeline 49, the electronic expansion valve 32, a water module liquid pipe temperature sensor 33, a water module air pipe temperature sensor 34, a circulating water pump 35, an electric heating unit 36, a water module outlet water temperature sensor 37, and a floor heating coil 38.

The medium flowing between the floor heating module 30 and the outdoor unit 10 is also the first medium, that is, the medium flowing in the floor heating external circulation loop 102 is the first medium, as shown in fig. 1, the direction of the arrow in the floor heating external circulation loop 102 can be understood as the flowing direction of the first medium in the floor heating external circulation loop 102, and since the outdoor unit 10, the first pipeline 41 and the tenth pipeline 50 are shared by the air conditioning circulation loop 101 and the floor heating external circulation loop 102, the outdoor unit 10, the tenth pipeline 50, the sixth pipeline 46, the fifth pipeline 45, the fourth pipeline 44 and the first pipeline 41 are sequentially connected end to end in the flowing direction of the first medium in the floor heating external circulation loop 102.

In this embodiment, the electronic expansion valve 32 and the water module liquid pipe temperature sensor 33 are both disposed on the sixth conduit 46. The water module air line temperature sensor 34 is disposed on the fourth conduit 44. It should be noted that, as will be understood by those skilled in the art, the fourth pipeline 44 may be referred to as a water module air pipe, a gaseous refrigerant flows in the water module air pipe, the sixth pipeline 46 may be referred to as a water module liquid pipe, a liquid refrigerant flows in the water module liquid pipe, and the liquid refrigerant is evaporated from a liquid state to a gaseous state after heat exchange in the water module 31. In connection with the above, it will be appreciated that a water module liquid tube temperature sensor 33 is provided on the water module liquid tube and a water module air tube temperature sensor 34 is provided on the water module air tube. As can be appreciated, water module liquid tube temperature sensor 33 is used to detect water module liquid tube temperature Tci and water module air tube temperature sensor 34 is used to detect water module air tube temperature Tco.

The water module liquid pipe temperature sensor 33 is located proximate to the junction of the sixth pipe 46 and the fifth pipe 45 relative to the electronic expansion valve 32, and the water module gas pipe temperature sensor 34 is located proximate to the junction of the fourth pipe 44 and the fifth pipe 45.

The medium flowing inside the floor heating module 30 is a second medium (refrigerant or heating medium), the second medium is generally water, that is, the medium flowing inside the floor heating internal circulation loop 103 is the second medium, as shown in fig. 1, the arrow direction in the floor heating internal circulation loop 103 can be understood as the flowing direction of the second medium in the floor heating internal circulation loop 103, in the flowing direction of the second medium in the floor heating internal circulation loop 103, the eighth pipeline 48, the circulating water pump 35, the electric heating unit 36, the floor heating coil 38, the ninth pipeline 49 and the seventh pipeline 47 are sequentially connected end to end, the water module outlet temperature sensor 37 is disposed at the water outlet position of the electric heating unit 36 and used for detecting the temperature of the second medium (refrigerant or heating medium) flowing through the electric heating unit 36, that is, the water module outlet temperature sensor 37 is used for detecting the water module outlet temperature Two.

In this embodiment, the fifth pipeline 45 and the seventh pipeline 47 are both located inside the water module 31, and heat exchange is achieved inside the water module 31, that is, heat exchange is achieved between the first medium in the fifth pipeline 45 and the second medium in the seventh pipeline 47 inside the water module 31.

The circulation of the medium in the three circulation circuits will be described in detail below with reference to fig. 1.

Air-conditioning circulation circuit 101: the first medium flowing out of the outdoor unit 10 flows into the tenth pipe 50, flows into the indoor unit 20 through the third pipe 43, exchanges heat in the indoor unit 20, flows out through the second pipe 42 connected to the indoor unit 20, and then flows back to the outdoor unit 10 through the first pipe 41 connected to the second pipe 42, thereby realizing circulation.

Ground heating external circulation loop 102: the first medium flowing out of the outdoor unit 10 flows into the tenth pipe 50, flows into the fifth pipe 45 in the water module 31 through the sixth pipe 46 connected to the tenth pipe 50, flows out through the fourth pipe 44 connected to the fifth pipe 45 after heat exchange is performed between the first medium and the seventh pipe 47 in the fifth pipe 45, and then flows back to the outdoor unit 10 through the first pipe 41 connected to the fourth pipe 44, thereby realizing circulation.

Ground heating inner circulation loop 103: the second medium that water module 31 flows out flows into eighth pipeline 48 earlier, then loops through circulating water pump 35 and electric heating unit 36 and gets into floor heating coil 38 in proper order, and the second medium carries out the heat exchange through floor heating coil 38 and indoor ground after, flows into the seventh pipeline 47 that is located water module 31 through the ninth pipeline 49 that is connected with floor heating coil 38, and the second medium realizes the heat exchange with fifth pipeline 45 in seventh pipeline 47 after, finally flows into eighth pipeline 48 again, realizes the circulation.

Generally, when the air-conditioning floor heating system 100 is in the cooling mode in summer, the electronic expansion valve 32 installed on the sixth pipeline 46 is in the closed state, at this time, theoretically, the first medium can only flow in the air-conditioning circulation loop 101, but because the electronic expansion valve 32 may have phenomena of blocking, desynchronizing, coil loosening and the like, part of the first medium which should flow in the air-conditioning circulation loop 101 may circulate in the floor heating external circulation loop 102, at this time, because the air-conditioning floor heating system 100 is in the cooling mode, the whole floor heating internal circulation loop 103 is in the shutdown state, if the evaporation temperature of the first medium at this time is lower than the freezing point, water in the water module 31 may freeze and expand, and there is a risk of freezing the water module 31.

Referring to fig. 1 and 2, in the present embodiment, the electronic expansion valve 32, the water module liquid pipe temperature sensor 33, the water module air pipe temperature sensor 34, the circulating water pump 35, the electric heating unit 36, and the water module outlet water temperature sensor 37 are all in communication with the controller 60.

The controller 60 receives temperature signals output by the water module liquid pipe temperature sensor 33, the water module air pipe temperature sensor 34 and the like, and can judge whether the air-conditioning floor heating system 100 needs to enter an anti-freezing mode. Once the air-conditioned floor heating system 100 is detected to need to enter the anti-freezing mode, it may control the electronic expansion valve 32 to reset. If the electronic expansion valve 32 has a poor resetting effect, the controller 60 can also control the start of the circulating water pump 35, and simultaneously can determine whether to start the electric heating unit 36 by receiving the temperature signal output by the water module outlet temperature sensor 37, and can correspondingly adjust the gears of the circulating water pump 35 and the electric heating unit 36 according to the temperature signal output by the water module outlet temperature sensor 37. By means of the intelligent adjusting mode, after the air-conditioning floor heating system 100 enters the anti-freezing mode, electric energy can be saved as much as possible. In this way, the phenomenon of expansion due to freezing of water in the water module 31 is not easy to occur, and the risk of freezing the water module 31 is reduced.

Referring to fig. 1, it should be noted that the air-conditioning floor heating system 100 in the present embodiment includes an outdoor unit 10, an indoor unit 20, and a floor heating module 30. In other embodiments, optionally, the air-conditioning floor heating system 100 includes one outdoor unit 10, two indoor units 20, and one floor heating module 30. Optionally, the air-conditioning floor heating system 100 includes one outdoor unit 10, one indoor unit 20, and two floor heating modules 30. Optionally, the air-conditioning floor heating system 100 includes two outdoor units 10, one indoor unit 20, and one floor heating module 30. Therefore, the number of the outdoor units 10, the indoor units 20, and the floor heating modules 30 is not limited, and the outdoor units 10, the indoor units 20, and the floor heating modules 30 may be operated independently or cooperatively.

Meanwhile, in fig. 1, the outdoor unit 10 includes a compressor 11 and a fan 12, and it should be noted that the outdoor unit 10 may be an air conditioner outdoor unit commonly known in the art, and similarly, the indoor unit 20 may also be an air conditioner indoor unit commonly known in the art.

Referring to fig. 1, the air-conditioning floor heating system 100 in fig. 1 is in a cooling mode, when the air-conditioning floor heating system is in a heating mode, a first medium output by the outdoor unit 10 is a heat medium, a part of the heat medium flows into the indoor unit 20, hot air is blown into a room through the indoor unit 20 to increase the indoor temperature, another part of the heat medium flows into the water module 31 to exchange heat in the water module 31, and after the circulating water pump 35 is started, a second medium (hot water) in the floor heating inner circulation loop 103 can be driven to flow, so that the second medium exchanges heat with the ground when flowing in the floor heating coil 38, and the ground heating is realized. The two heating modes are jointly started, so that a better heating effect can be achieved.

Referring to fig. 3 and fig. 4, a detailed process of the intelligent adjustment of the floor heating system with air conditioner 100 provided in this embodiment will be described in detail below. The structure of the air-conditioning floor heating system 100 can be combined with the structures shown in fig. 1 and fig. 2.

The anti-freezing control method of the air-conditioning floor heating system 100 comprises the following steps:

s100: and acquiring the temperature Tci of a liquid pipe of the water module and acquiring the temperature Tco of an air pipe of the water module.

S200: and if Tci is less than or equal to a first preset value and Tco is less than or equal to a second preset value, controlling the floor heating system 100 of the air conditioner to enter an anti-freezing mode.

Through obtaining water module liquid pipe temperature Tci and obtaining water module trachea temperature Tco, through the comparison of two temperatures and default, if satisfy Tci and be less than or equal to first default, and, Tco is less than or equal to the second default, it reveals that electronic expansion valve 32 at this moment has the phenomenon of revealing, can predict ground, if evaporating temperature is less than the freezing point after the refrigerant is revealed, the water in water module 31 can appear the phenomenon of the inflation of freezing, consequently, through controlling air conditioner underfloor heating system 100 to get into the mode of preventing frostbite, can improve the temperature of water module 31 internal water, and then can reduce the risk that water module 31 is frozen out.

In conjunction with the above, the water module liquid pipe temperature Tci is detected by the water module liquid pipe temperature sensor 33, and the water module gas pipe temperature Tco is detected by the water module gas pipe temperature sensor 34. In this embodiment, in conjunction with fig. 1, the number of water module liquid pipe temperature sensors 33 is one, and in other embodiments, two water module liquid pipe temperature sensors 33 may be installed, and the value of the water module liquid pipe temperature Tci is determined by one of the two water module liquid pipe temperature sensors 33, or the average value of the two values detected by the two water module liquid pipe temperature sensors 33. Similarly, the number of the water module air pipe temperature sensors 34 can be two. Therefore, the number of the water module liquid pipe temperature sensors 33 and the water module gas pipe temperature sensors 34 is not limited, and two, three, four, etc. may be used as long as the water module liquid pipe temperature Tci and the water module gas pipe temperature Tco can be determined by detection.

In the embodiment, the temperature is not lower than 3 ℃ and not higher than 5 ℃ under a first preset value; the second preset value is more than or equal to 3 ℃ and less than or equal to 5 ℃. Such a value can relatively accurately reflect the leakage condition of the electronic expansion valve 32, and can improve the control reliability of the whole system. The first preset value can be selected from 3 deg.C, 3.5 deg.C, 4 deg.C, 4.5 deg.C, 5 deg.C, etc. Similarly, the second predetermined value may be selected from 3 deg.C, 3.5 deg.C, 4 deg.C, 4.5 deg.C, 5 deg.C, etc.

Generally, if there is a detection deviation between the water module liquid pipe temperature sensor 33 and the water module air pipe temperature sensor 34, a false determination may occur. In this embodiment, the first preset value and the second preset value are slightly larger than the freezing points of the water in the water module 31, so that the detection accuracy can be improved relatively. The situation that the water in the water module 31 actually reaches the freezing point and the water module liquid pipe temperature sensor 33 and the water module air pipe temperature sensor 34 cannot detect the water is avoided. Of course, in actual operation, the first preset value and the second preset value can be set independently according to different actual regions. In other words, the first preset value may not be limited to be between 3 ℃ and 5 ℃, and may be higher or lower than this range. The second preset value may not be limited to 3 ℃ to 5 ℃, and may be higher or lower than this range.

Optionally, the water module liquid pipe temperature Tci is an average temperature value of the water module liquid pipe temperature within a first preset duration, or the water module liquid pipe temperature Tci is a maximum temperature value of the water module liquid pipe temperature within the first preset duration.

Optionally, the water module air pipe temperature Tco is an average temperature value of the water module air pipe temperature within a second preset duration, or the water module air pipe temperature Tco is a maximum temperature value of the water module air pipe temperature within the second preset duration.

The first preset time length can be selected to be 10s, and the second preset time length can also be selected to be 10 s. In other words, the temperature of the water module air pipe can be detected within 10 consecutive seconds, or the temperature of the water module liquid pipe can be detected within 10 consecutive seconds, and since the temperature of the water module liquid pipe and the temperature of the water module air pipe may fluctuate within a certain time period, if the temperature value at a certain instant is directly selected, the air-conditioning floor heating system 100 may be switched back and forth between entering the anti-freezing mode and exiting the anti-freezing mode, so that not only is the power consumption increased, but also the control reliability of the whole system is reduced. Of course, the first preset time period may also be any value between 8s and 12s, and the second preset time period may also be any value between 8s and 12 s.

In this embodiment, before the steps of obtaining the temperature Tci of the liquid pipe of the water module and obtaining the temperature Tco of the air pipe of the water module, the anti-freezing control method further includes:

and controlling the air-conditioning floor heating system 100 to start in a cooling mode, and continuously operating the compressor 11 of the air-conditioning floor heating system 100 for a third preset time.

By the control, corresponding temperature detection can be carried out after the compressor 11 operates stably, so that the control accuracy of the whole system can be improved. The third preset time period may be selected from 3min to 6min, for example, 3min, 4min, 5min, 6min, and the like. For example, in one embodiment, the entire system starts to stabilize step by step after the compressor 11 runs for 3min, and at this time, if the electronic expansion valve 32 leaks, the water module liquid pipe temperature Tci and the water module gas pipe temperature Tco will decrease step by step after the electronic expansion valve 32 throttles.

It should be noted that after the air-conditioned floor heating system 100 enters the anti-freeze mode, the system may alarm, for example, by displaying an alarm through a display lamp installed on the indoor unit 20, or by displaying an alarm through a display screen on a remote controller of the indoor unit 20.

The floor heating system 100 of the air conditioner enters the anti-freezing mode in many operations, for example, the stepping motor is controlled to drive the electronic expansion valve 32 to reset, the circulating water pump 35 is started, the electric heating unit 36 is started, and the like. The specific operation of the air conditioner floor heating system 100 entering the anti-freeze mode will be described in detail below.

Referring to fig. 4, in this embodiment, the step of controlling the air-conditioning floor heating system 100 to enter the anti-freezing mode includes:

s210: and controlling the electronic expansion valve 32 of the air-conditioning floor heating system 100 to open a step A, and controlling the electronic expansion valve 32 to close b step A after the fourth preset time length, so that the electronic expansion valve 32 is reset.

Wherein a is more than 0 and less than 1, b is more than 1, and A is the maximum step number of the electronic expansion valve 32.

By opening the electronic expansion valve 32 and then closing the electronic expansion valve, errors can be reduced, and the situation that the electronic expansion valve 32 can be closed in theory and is not closed actually due to valve closing errors is avoided.

This action may be understood as a one-stage anti-freeze action, i.e. a reset operation of the electronic expansion valve 32 is performed. For example, when a is 0.5, b is 1.2, and A is 200. In one embodiment, the electronic expansion valve 32 is controlled to open for 100 steps, and then closed for 240 steps after a fourth preset time period, and the electronic expansion valve 32 is opened and then closed first, and the number of the valve closing steps is greater than a, so that the electronic expansion valve is prevented from being closed due to a valve closing error. In the present embodiment, the fourth preset time period is selected to be 0.2s-1s, for example, 0.2s, 0.5s, 0.8s, 1s, etc., and the valve closing during this time period can be understood as a fast valve closing, in such a way that the electronic expansion valve 32 can be forced to reset. In other embodiments, a may be 0.2, 0.6, 0.8, etc., b may be 1.1, 1.3, 1.4, etc., and a may be 180, 220, 300, etc.

As will be understood by those skilled in the art, the adjustment of the opening degree of the electronic expansion valve 32 is generally calculated in steps, and since the adjustment structure of the electronic expansion valve 32 is generally a stepping motor, the minimum angle range of the stepping motor is referred to as one step.

In this embodiment, the step of controlling the floor heating system with air conditioner 100 to enter the anti-freezing mode further includes:

s220: and after the electronic expansion valve 32 is reset for the fifth preset time, acquiring the temperature Tci of the liquid pipe of the water module again and acquiring the temperature Tco of the air pipe of the water module, if the temperature Tci is less than or equal to the first preset value and the temperature Tco is less than or equal to the second preset value, controlling the electronic expansion valve 32 to open a step A again, and controlling the electronic expansion valve 32 to close b step A after the fourth preset time.

And if Tci is not satisfied and is not more than the first preset value and Tco is not more than the second preset value, controlling the air-conditioning floor heating system 100 to exit the anti-freezing mode.

It can be understood that after the electronic expansion valve 32 is reset for the fifth preset time, theoretically, the electronic expansion valve 32 has stopped leaking, in order to reduce the error, the temperature Tci of the liquid pipe of the water module and the temperature Tco of the air pipe of the water module may be obtained again, if the temperature Tci is not greater than the first preset value and the temperature Tco is not greater than the second preset value at this time, it is indicated that the electronic expansion valve 32 is not closed, and the probability of leaking the electronic expansion valve 32 may be reduced by controlling the electronic expansion valve 32 to perform the resetting operation again. Meanwhile, if Tci is not greater than or equal to the first preset value and Tco is not greater than or equal to the second preset value, the leakage of the electronic expansion valve 32 is effectively controlled, and the air-conditioning floor heating system 100 can be controlled to exit the anti-freezing mode, so that electric energy can be saved.

The fifth preset duration may be selected from 25s-35s, for example, 25s, 28s, 30s, 33s, 35s, etc.

s230: after the electronic expansion valve 32 is reset for the sixth preset time period, the water module liquid pipe temperature Tci is obtained again, and the water module gas pipe temperature Tco is obtained.

And if Tci is less than or equal to a first preset value and Tco is less than or equal to a second preset value, starting the circulating water pump 35 of the air-conditioning floor heating system 100.

Wherein the sixth preset time length is larger than the fifth preset time length.

It can be understood that, after the electronic expansion valve 32 is reset for the sixth preset time, theoretically, the electronic expansion valve 32 has stopped leaking, in order to reduce errors, the temperature Tci of the liquid pipe of the water module and the temperature Tco of the air pipe of the water module may be obtained again, if the temperature Tci is not greater than the first preset value and the temperature Tco is not greater than the second preset value at this time, it is indicated that the electronic expansion valve 32 is not closed, and it is indicated that the effect of resetting the electronic expansion valve 32 is relatively unsatisfactory, therefore, by starting the circulating water pump 35 of the air-conditioning floor heating system 100, when the circulating water pump 35 is in operation, the cold energy in the water module 31 may be taken away, and the temperature in the water module 31 is prevented from continuously decreasing. Meanwhile, if Tci is not satisfied at this time and Tco is not greater than the second preset value, which indicates that the temperature in the water module 31 is effectively controlled, the air-conditioning floor heating system 100 can be controlled to exit the anti-freezing mode, so that electric energy can be saved.

The sixth preset duration may be selected to be 55s-65s, for example, 55s, 60s, 65s, etc. It is understood that when the fifth preset time period is 30S and the sixth preset time period is 60S, the step 230 may be understood as performing the temperature detection and the logic judgment again after 30S after the step S220 is completed. In this embodiment, if Tci is not greater than the first preset value and Tco is not greater than the second preset value in step S230, the controller 60 further controls the display screen of the remote controller to display the word "water module anti-freeze protection" to remind the user.

In this embodiment, the step of starting circulating water pump 35 of air conditioner underfloor heating system 100 includes:

starting the circulating water pump 35 to operate at an L1 gear, and acquiring the water outlet temperature Two of the water module after a seventh preset time;

and controlling the circulating water pump 35 to operate at a corresponding gear according to the value of Two.

The gear of the circulating water pump 35 is correspondingly controlled by the value of Two, so that the electric energy can be saved while effective control is performed. It should be noted that the operation of performing freeze prevention by starting the circulating water pump 35 may be understood as a secondary freeze prevention action.

The seventh preset time period may be selected from 2min to 4min, for example, 2min, 3min, 4min, and the like.

In this embodiment, the step of controlling the circulating water pump 35 to operate at the corresponding gear includes:

if the Two is larger than or equal to the third preset value, controlling the circulating water pump 35 to continuously operate at an L1 gear;

if the fourth preset value is not more than Two and is less than the third preset value, controlling the circulating water pump 35 to operate at an L2 gear;

if the fifth preset value is less than Two and less than the fourth preset value, controlling the circulating water pump 35 to operate at an L3 gear;

if the Two is less than or equal to a fifth preset value, controlling the circulating water pump 35 to operate at an L3 gear, and starting the electric heating unit 36 of the air-conditioning floor heating system 100;

It is understood that the circulation water pump 35 may be controlled to operate in the low range if the value of Two is relatively high, the circulation water pump 35 may be controlled to operate in the medium range if the value of Two is relatively medium, and the circulation water pump 35 may be controlled to operate in the high range if the value of Two is relatively low. In this way, the temperature of the water module 31 can be effectively controlled, and electric energy can be saved. Of course, if the value of Two is too low, it indicates that the temperature of the water module 31 cannot be effectively controlled by starting the circulating water pump 35, and at this time, by starting the electric heating unit 36 of the air-conditioning floor heating system 100, the temperature in the water module 31 can be further assisted to be increased by the heating function of the electric heating unit 36.

In this embodiment, 25 ℃ can be selected as the third preset value, 20 ℃ can be selected as the fourth preset value, and 16 ℃ can be selected as the fifth preset value. By the influence of the room temperature, it is possible to relatively accurately determine which gear is used to control the circulating water pump 35 by selecting the temperature value. Of course, in other embodiments, the third preset value, the fourth preset value and the fifth preset value may be selected according to actual requirements.

As will be understood by those skilled in the art, L3 indicates a high gear, L2 indicates a medium gear, and L1 indicates a low gear, that is, the rotational speed of the circulating water pump 35 is high in the high gear, the rotational speed of the circulating water pump 35 is medium in the medium gear, and the rotational speed of the circulating water pump 35 is low in the low gear. It should be noted that, in practical implementation, there may be more than three gears, such as four gears, five gears, etc., as long as the control of the temperature in the water module 31 can be achieved by upshifting or downshifting.

It can be understood that the higher the temperature of the second medium is, the lower the risk that the water module 31 is frozen is, the lower the speed of the circulating water pump 35 is, energy and electricity are saved, the floor of the room is likely to be condensed and damaged when the temperature of the second medium is lower than 16 ℃, and therefore the second medium needs to be heated when the Two is less than or equal to 16 ℃.

In this embodiment, the step of starting the electric heating unit 36 of the air-conditioning floor heating system 100 includes:

the electric heating unit 36 is started to operate at the N1 gear, and the electric heating unit 36 is controlled to operate at the corresponding gear according to the Δ T.

The temperature value Δ T is Two(s) -Two (s-n), where Two(s) is a water module outlet temperature value obtained at s time, Two (s-n) is a water module outlet temperature value obtained at n min before s time, or Two (s-n) is an average temperature value of water module outlet temperatures obtained at n min before s time.

Wherein n is a sixth preset value.

The gear of the electric heating unit 36 is correspondingly controlled by delta T, so that the electric energy can be saved while the effective control is carried out. It should be noted that the operation of performing freeze protection by activating the electric heating unit 36 may be understood as a three-stage freeze protection action. N may be selected from 1, 2, 3, and the like.

In this embodiment, the step of controlling the electric heating unit 36 to operate in the corresponding gear according to Δ T includes:

if delta T is greater than 0 after the eighth preset time period, controlling the electric heating unit 36 to continue to operate at the N1 gear;

if the delta T is less than or equal to 0 after the ninth preset time period, controlling the electric heating unit 36 to continue to operate at the N2 gear;

after the electric heating unit 36 continuously operates at the N2 gear for the tenth preset time, if the delta T is larger than or equal to 0, controlling the electric heating unit 36 to continuously operate at the N2 gear, and if the delta T is smaller than 0, controlling the electric heating unit 36 to operate at the N3 gear;

if Two is greater than or equal to the fourth preset value, the electric heating unit 36 is turned off.

It can be understood that if Δ T is greater than 0 for the eighth preset time period, the electric heating unit 36 may be controlled to operate at the low gear, if Δ T is less than or equal to 0 for the ninth preset time period, the electric heating unit 36 may be controlled to operate at the medium gear, after the electric heating unit 36 continuously operates at the N2 for the tenth preset time period, if Δ T is greater than or equal to 0, the electric heating unit 36 may be controlled to continue to operate at the medium gear, and if Δ T is less than 0, the electric heating unit 36 may be controlled to operate at the high gear. In this way, effective control of the temperature within the water module 31 is achieved while conserving electrical energy. Of course, if Two is greater than or equal to the fourth preset value, it indicates that the temperature of the water module 31 can be effectively controlled by starting the circulating water pump 35 and the electric heating unit 36, and at this time, the electric heating unit 36 is turned off, so that the energy consumption can be reduced.

Those skilled in the art will appreciate that N3 represents high gear, N2 represents medium gear, and N1 represents low gear. Δ T is greater than or equal to 0, which indicates that the temperature of the second medium is continuously increased or unchanged, and also indicates that the risk of freezing the water module 31 is continuously reduced or unchanged, in other words, indicates that the heating capacity of the electric heating unit 36 is greater than or equal to the cooling capacity leaked by the electronic expansion valve 32, at this time, the temperature in the water module 31 does not decrease, and therefore, the gear of the electric heating unit 36 is maintained unchanged at this time. Δ T < 0, which indicates that the temperature of the second medium is continuously decreased, which indicates that the risk of freezing the water module 31 is continuously increased, in other words, that the heating capacity of the electric heating unit 36 is less than the cooling capacity leaked from the electronic expansion valve 32, at this time, the temperature of the water module 31 is in a downward trend, and it is necessary to increase the gear of the electric heating unit 36 to prevent the temperature from continuously decreasing.

In this embodiment, the relationship between the power and the gear of the electric heating unit 36 is as follows:

N3＝2*N2＝3*N1

it should be noted that, in practical implementation, there may be more than three gears, such as four gears, five gears, etc., as long as the control of the temperature in the water module 31 can be achieved by upshifting or downshifting.

Generally, when the electric heating unit 36 is started, the circulating water pump 35 needs to be continuously operated, otherwise the corresponding pipeline may be damaged.

In this embodiment, the anti-freeze control method further includes:

and if a stop signal of the compressor 11 of the air-conditioning floor heating system 100 is acquired, or the air-conditioning floor heating system 100 is switched to the heating mode, or the air-conditioning floor heating system 100 is in the single air outlet mode, controlling the air-conditioning floor heating system 100 not to enter the anti-freezing mode.

When the compressor 11 is stopped, the air-conditioning floor heating system 100 is switched to the heating mode or the air-conditioning floor heating system 100 is in the single air outlet mode, at this time, because the water module 31 has no cold energy source, the risk that the water module 31 is frozen is relatively low, and therefore the air-conditioning floor heating system 100 can be controlled not to enter the anti-freezing mode, so that electric energy can be saved.

In this embodiment, the anti-freeze control method further includes:

after the air-conditioning floor heating system 100 is controlled to enter the anti-freezing mode, if Tci is greater than a first preset value or Tco is greater than a second preset value within a continuous eleventh preset time, the air-conditioning floor heating system 100 is controlled to exit the anti-freezing mode.

It can be understood that if Tci is greater than the first preset value or Tco is greater than the second preset value within the continuous eleventh preset time, it indicates that the temperature of the water module 31 is relatively suitable at this time and the risk of being frozen is relatively low, and the air-conditioning floor heating system 100 can be controlled to exit the anti-freezing mode, so as to save electric energy. It should be noted that, after the circulating water pump 35 and the electric heating unit 36 are both turned off, when the requirement that the air-conditioning floor heating system 100 needs to enter the anti-freezing mode is met, the anti-freezing mode is entered again.

The eleventh preset duration may be selected to be 8s-12s, e.g., 8s, 10s, 12s, etc.

The embodiment of the invention also provides a controller 60, and the controller 60 is used for executing the anti-freezing control method of the floor heating system 100 with the air conditioner.

The technical effect of the controller 60 is similar to that of the above-mentioned anti-freezing control method for the floor heating system 100, and will not be described herein again.

In combination with the above, the working principle of the present embodiment is as follows:

the controller 60 performs multidimensional determination through the working mode of the air-conditioning floor heating system 100, the continuous working time of the compressor 11, the air pipe temperature of the water module, the liquid pipe temperature of the water module, the water outlet temperature of the water module and the like, and determines whether the system needs to enter the anti-freezing mode or exit the anti-freezing mode.

Specifically, after the air-conditioning floor heating system 100 is started in the refrigeration mode, and the compressor 11 continuously runs for a third preset time, after the whole air-conditioning floor heating system 100 starts to be gradually stabilized, whether the air-conditioning floor heating system 100 needs to enter the anti-freezing mode is judged through the detected air pipe temperature of the water module and the liquid pipe temperature of the water module, and the detection and judgment accuracy is high. It should be noted that, if the compressor 11 of the air-conditioning floor heating system 100 is stopped, the air-conditioning floor heating system 100 is switched to the heating mode, or the air-conditioning floor heating system 100 is in the single air outlet mode, the risk that the water module 31 is frozen is low, and the air-conditioning floor heating system 100 may not enter the anti-freezing mode.

When it is determined that the air-conditioning floor heating system 100 needs to enter the anti-freezing mode through the judgment, the air-conditioning floor heating system 100 can be controlled to enter a primary anti-freezing action, that is, the electronic expansion valve 32 is reset, and the first medium is prevented from flowing in the water module 31 from the root. If the effect of the primary anti-freezing action is ideal, the floor heating system 100 of the air conditioner can be controlled to exit the anti-freezing mode.

If the result of the primary anti-freezing action is not ideal, the air-conditioning floor heating system 100 can be controlled to enter the secondary anti-freezing action, namely, the circulating water pump 35 is started, the circulating water pump 35 is controlled to operate according to the corresponding gear according to the water outlet temperature of the water module, the second medium can be driven to circularly flow in the floor heating internal circulation loop 103 through the operation of the circulating water pump 35, and the second medium is subjected to heat exchange inside the water module 31, so that the temperature in the water module 31 is increased.

If the result of the second-stage anti-freezing action is not ideal, the air-conditioning floor heating system 100 can be controlled to enter the third-stage anti-freezing action, namely, under the condition that the circulating water pump 35 continuously operates, the electric heating unit 36 is started, the electric heating unit 36 is controlled to operate according to the corresponding gear in a grading mode according to the temperature of the water module outlet water, and by starting the circulating water pump 35 and the electric heating unit 36, the second medium can flow in the floor heating internal circulation loop 103 in a circulating mode and can be heated, so that the temperature in the water module 31 is further increased when the second medium flows in the water module 31.

In the processes of the first-stage anti-freezing action, the second-stage anti-freezing action and the third-stage anti-freezing action, the controller 60 obtains the temperature of the liquid pipe of the water module and the temperature of the air pipe of the water module in real time, if the temperature of the liquid pipe of the water module and the temperature of the air pipe of the water module are detected to meet the condition that the floor heating system 100 of the air conditioner does not need to enter the anti-freezing mode, the controller 60 can control the floor heating system 100 of the air conditioner to exit the anti-freezing mode when judging that the risk that the water module 31 is frozen at the moment is relatively low, namely the circulating water pump 35 and the electric heating unit 36 are turned off, and if the temperature of the liquid pipe of the water module and the temperature of the air pipe of the water.

Through the primary anti-freezing action, the secondary anti-freezing action and the tertiary anti-freezing action, the anti-freezing reliability of the system can be greatly improved. Meanwhile, the temperature of the water module liquid pipe temperature sensor 33, the water module air pipe temperature sensor 34 and the water module water outlet temperature sensor 37 is detected, so that the detection accuracy and the control accuracy can be improved, and the probability of the condition of no report or false report is reduced.

The specific antifreeze control method for the floor heating system 100 with the air conditioner provided by the embodiment is as follows:

the air-conditioning floor heating system 100 is started in a refrigeration mode, and after the compressor 11 continuously operates for 3min, the temperature Tci of the liquid pipe of the water module and the temperature Tco of the air pipe of the water module are detected in real time.

And if the average value of the water module liquid pipe temperatures Tci detected within 10 continuous seconds is less than or equal to 5 ℃, and the average value of the water module gas pipe temperatures Tco detected within 10 continuous seconds is less than or equal to 5 ℃, controlling the air-conditioning floor heating system 100 to enter an anti-freezing mode.

Primary freeze prevention action (freeze prevention mode):

the electronic expansion valve 32 is controlled to perform the reset operation: controlling the electronic expansion valve 32 to be opened by 0.5A step first, and then to be closed by 1.2A step after 0.2s, so that the electronic expansion valve 32 is reset;

and after the resetting is finished for 30s, the temperature Tci of the liquid pipe of the water module and the temperature Tco of the air pipe of the water module are detected again, and if the average value of the temperature Tci of the liquid pipe of the water module within continuous 10s is less than or equal to 5 ℃, and the average value of the temperature Tco of the air pipe of the water module within continuous 10s is less than or equal to 5 ℃, the electronic expansion valve 32 is controlled again to perform the resetting operation. And if not, controlling the floor heating system 100 of the air conditioner to exit the anti-freezing mode.

And detecting the temperature Tci of the liquid pipe of the water module and the temperature Tco of the air pipe of the water module again after 30 seconds, if the average value of the temperature Tci of the liquid pipe of the water module within continuous 10 seconds is less than or equal to 5 ℃, and the average value of the temperature Tco of the air pipe of the water module within continuous 10 seconds is less than or equal to 5 ℃, controlling the floor heating system 100 of the air conditioner to perform secondary anti-freezing action, and displaying a word of 'anti-freezing protection of the water module' through a remote controller of the indoor unit 20. And if not, controlling the floor heating system 100 of the air conditioner to exit the anti-freezing mode.

Where a is the maximum number of steps in the design of the electronic expansion valve 32.

Secondary anti-freezing action (anti-freezing mode):

controlling the circulating water pump 35 to be immediately started and operated at the L1 gear, starting to detect the water outlet temperature Two of the water module after 3min, when the Two is more than or equal to 24 ℃, continuously operating the circulating water pump 35 at the low rotating speed L1 gear, when the Two is more than or equal to 20 ℃ and less than 24 ℃, operating the circulating water pump 35 at the medium rotating speed L2 gear, when the Two is less than 20 ℃, operating the circulating water pump 35 at the high rotating speed L3 gear, and when the Two is less than or equal to 16 ℃, entering a three-stage anti-freezing action.

Three-stage anti-freezing action (anti-freezing mode):

and controlling the circulating water pump 35 to continuously operate at a high rotating speed L3 gear, simultaneously controlling the electric heating unit 36 to be immediately started, and operating at an N1 gear, wherein the difference between the current water module outlet water temperature value and the average value of the water module outlet water temperature in the last minute is defined as delta T (Two)(s) -Two (s-1 min).

If delta T is greater than 0 after 3min continuously, controlling the electric heating unit 36 to maintain the low-power N1 gear to operate, if delta T is less than or equal to 0 after 3min continuously, controlling the electric heating unit 36 to be switched to the medium-power N2 gear, after the electric heating unit 36 is switched to the medium-power N2 gear for 3min continuously, if delta T is greater than or equal to 0, continuously maintaining the medium-power N2 gear, if delta T is less than 0, controlling the electric heating unit 36 to be switched to the high-power N3 gear to operate continuously, and when Two is greater than or equal to 20 ℃, controlling the electric heating unit 36 to be switched off.

Wherein, the power relation is: n3-2 x N2-3 x N1

In the above process, if the compressor 11 is stopped, or the air-conditioning floor heating system 100 is switched to the heating mode, or the air-conditioning floor heating system 100 is in the single air outlet mode, the air-conditioning floor heating system 100 is controlled not to enter the anti-freezing mode.

In the process, if the average value of the water module liquid pipe temperature Tci is more than 5 ℃ within continuous 10s, or the average value of the water module air pipe temperature Tco is more than 5 ℃, the air-conditioning floor heating system 100 is controlled to exit the anti-freezing mode, and if the average value of the water module liquid pipe temperature Tci detected within continuous 10s is less than or equal to 5 ℃ and the average value of the water module air pipe temperature Tco detected within continuous 10s is less than or equal to 5 ℃, the air-conditioning floor heating system 100 is controlled to enter the anti-freezing mode again.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An anti-freezing control method for an air-conditioning floor heating system (100) is characterized by comprising the following steps:

and if Tci is less than or equal to a first preset value and Tco is less than or equal to a second preset value, controlling the floor heating system (100) of the air conditioner to enter an anti-freezing mode.

2. The antifreeze control method for the air-conditioning floor heating system (100) as claimed in claim 1, wherein the water module liquid pipe temperature Tci is an average temperature value of the water module liquid pipe temperature within a first preset duration, or the water module liquid pipe temperature Tci is a maximum temperature value of the water module liquid pipe temperature within the first preset duration;

3. The anti-freezing control method for the air-conditioning floor heating system (100) as claimed in claim 1, wherein the first preset value is less than or equal to 3 ℃ and less than or equal to 5 ℃; the second preset value is more than or equal to 3 ℃ and less than or equal to 5 ℃.

4. The antifreeze control method for an air-conditioning floor heating system (100) as set forth in claim 1, wherein before the step of obtaining the water module liquid pipe temperature Tci and the water module gas pipe temperature Tco, the antifreeze control method further comprises:

and controlling the air-conditioning floor heating system (100) to start in a refrigerating mode, and continuously operating a compressor (11) of the air-conditioning floor heating system (100) for a third preset time.

5. The antifreeze control method for the floor heating system (100) with the air conditioner as claimed in any one of claims 1 to 4, wherein the step of controlling the floor heating system (100) to enter the antifreeze mode comprises the following steps: controlling an electronic expansion valve (32) of the air-conditioning floor heating system (100) to open a step A, and controlling the electronic expansion valve (32) to close b step A after a fourth preset time period, so that the electronic expansion valve (32) is reset;

wherein a is more than 0 and less than 1, b is more than 1, and A is the maximum step number of the electronic expansion valve (32).

6. The antifreeze control method for the floor heating system (100) with the air conditioner as claimed in claim 5, wherein the step of controlling the floor heating system (100) to enter the antifreeze mode further comprises the steps of:

after the electronic expansion valve (32) is reset for the fifth preset time, the temperature Tci of a liquid pipe of the water module and the temperature Tco of an air pipe of the water module are obtained again, if the Tci is not more than a first preset value and the Tco is not more than a second preset value, the electronic expansion valve (32) is controlled to be opened a A step again, and the electronic expansion valve (32) is controlled to be closed b A step after the fourth preset time;

and if Tci is not satisfied and is not more than a first preset value and Tco is not more than a second preset value, controlling the air-conditioning floor heating system (100) to exit the anti-freezing mode.

7. The antifreeze control method for the floor heating system (100) with the air conditioner as claimed in claim 6, wherein the step of controlling the floor heating system (100) to enter the antifreeze mode further comprises the steps of:

after the electronic expansion valve (32) is reset for the sixth preset time, the temperature Tci of a liquid pipe of the water module and the temperature Tco of an air pipe of the water module are obtained again, and if the Tci is less than or equal to a first preset value and the Tco is less than or equal to a second preset value, a circulating water pump (35) of the air-conditioning floor heating system (100) is started;

if Tci is not satisfied and is not more than a first preset value and Tco is not more than a second preset value, controlling the air-conditioning floor heating system (100) to exit the anti-freezing mode;

wherein the sixth preset time is longer than the fifth preset time.

8. The antifreeze control method for the floor heating system (100) of claim 7, wherein the step of starting the circulating water pump (35) of the floor heating system (100) comprises the following steps:

starting the circulating water pump (35) to operate at an L1 gear, and acquiring the water outlet temperature Two of the water module (31) after a seventh preset time;

and controlling the circulating water pump (35) to operate at a corresponding gear according to the value of the Two.

9. The antifreeze control method for a floor heating system (100) with an air conditioner as claimed in claim 8, wherein the step of controlling the circulating water pump (35) to operate at a corresponding gear comprises the following steps:

if the Two is larger than or equal to a third preset value, controlling the circulating water pump (35) to continuously operate at an L1 gear;

if the fourth preset value is not more than Two and is less than the third preset value, controlling the circulating water pump (35) to operate at an L2 gear;

if the fifth preset value is larger than Two and smaller than the fourth preset value, controlling the circulating water pump (35) to operate at an L3 gear;

if the Two is less than or equal to a fifth preset value, controlling the circulating water pump (35) to operate at an L3 gear, and starting an electric heating unit (36) of the air-conditioning floor heating system (100);

10. The antifreeze control method for the air-conditioning floor heating system (100) as claimed in claim 9, wherein the step of starting the electric heating unit (36) of the air-conditioning floor heating system (100) comprises the following steps:

starting the electric heating unit (36) to operate in a gear N1, and controlling the electric heating unit (36) to operate in a corresponding gear according to delta T;

wherein, Δ T ═ Two(s) — Two (s-n), Two(s) is the water outlet temperature value of the water module (31) obtained at s moment, Two (s-n) is the water outlet temperature value of the water module (31) obtained at n min before s moment, or Two (s-n) is the average temperature value of the water outlet temperature of the water module (31) obtained at n min before s moment; wherein n is a sixth preset value.

11. The antifreeze control method for a floor heating system (100) with an air conditioner as set forth in claim 10, wherein the step of controlling the electric heating unit (36) to operate at the corresponding gear according to Δ T comprises: if delta T is larger than 0 after the eighth preset time period, controlling the electric heating unit (36) to continuously operate at the N1 gear;

if delta T is less than or equal to 0 after the ninth preset time period, controlling the electric heating unit (36) to continuously operate at the N2 gear;

after the electric heating unit (36) continuously operates for a tenth preset time period at a gear N2, if the delta T is larger than or equal to 0, controlling the electric heating unit (36) to continuously operate at a gear N2, and if the delta T is smaller than 0, controlling the electric heating unit (36) to operate at a gear N3;

if the Two is larger than or equal to the fourth preset value, the electric heating unit (36) is closed.

12. The antifreeze control method for the floor heating system (100) with the air conditioner as claimed in any one of claims 1 to 4, further comprising:

if a stop signal of a compressor (11) of the air-conditioning floor heating system (100) is acquired, or the air-conditioning floor heating system (100) is switched to a heating mode is acquired, or the air-conditioning floor heating system (100) is acquired to be in a single air outlet mode, the air-conditioning floor heating system (100) is controlled not to enter the anti-freezing mode.

13. The antifreeze control method for the floor heating system (100) with the air conditioner as claimed in any one of claims 1 to 4, further comprising:

after the air-conditioning floor heating system (100) is controlled to enter the anti-freezing mode, if Tci is larger than a first preset value or Tco is larger than a second preset value within continuous eleventh preset time, the air-conditioning floor heating system (100) is controlled to exit the anti-freezing mode.

14. A controller, characterized in that the controller (60) is used for executing the anti-freezing control method of the air-conditioning floor heating system (100) as claimed in any one of claims 1 to 13.

15. An air-conditioning floor heating system, which is characterized by comprising an outdoor unit (10), an indoor unit (20), a floor heating module (30) and the controller (60) as claimed in claim 14;

the floor heating module (30) and the indoor unit (20) are both connected with the outdoor unit (10);

the water module liquid pipe of the floor heating module (30) is provided with a water module liquid pipe temperature sensor (33), the water module air pipe of the floor heating module (30) is provided with a water module air pipe temperature sensor (34), the water module liquid pipe temperature sensor (33) and the water module air pipe temperature sensor (34) are communicated with the controller (60).