CN110542256A - Anti-freezing control method and device, heat pump water system and storage medium - Google Patents

Abstract

The disclosure provides an anti-freezing control method, an anti-freezing control device, a heat pump water system and a storage medium, wherein the method comprises the following steps: detecting control parameters, and judging whether to enter an anti-freezing detection stage according to the control parameters; if yes, entering an anti-freezing detection stage, and detecting a water flow value for anti-freezing operation; determining an anti-freezing operation mode based on the water flow value, and performing corresponding anti-freezing operation control according to the anti-freezing operation mode; wherein, the anti-freezing operation mode comprises: a water-free anti-freezing operation mode, a water-shortage anti-freezing operation mode or a water-existence anti-freezing operation mode. The method, the device, the heat pump water system and the storage medium can respectively carry out anti-freezing detection and control on the completely water-free state, the water-deficient state and the water-containing state of the heat pump water system, improve the reliability of anti-freezing control, reduce the risks of equipment damage and the like and reduce the maintenance cost.

Description

anti-freezing control method and device, heat pump water system and storage medium

Technical Field

The invention relates to the technical field of heat pump water systems, in particular to an anti-freezing control method and device, a heat pump water system and a storage medium.

Background

In the automatic anti-freezing control of the existing heat pump water system, the anti-freezing operation water flow detection is started, and when the anti-freezing operation water flow is greater than or equal to the water flow switch off value, the automatic anti-freezing operation is started; and when the anti-freezing operation water flow is smaller than the water flow switch off value, judging that the anti-freezing operation water flow does not meet the minimum water flow requirement, setting a control fault, and performing anti-freezing operation abnormally. If the control fault occurs once, the system cannot be recovered, and the anti-freezing operation is completely failed under the condition that water still exists in the system, so that the water stored in the system is frozen to cause damage after being cooled to the freezing point; if the control fault can be recovered without limitation, the unit tries to start the water pump without limitation after meeting the anti-freezing condition, and the water pump sliding bearing is lack of water lubricating medium in a water-free state to cause dry grinding of the bearing, so that the water pump bearing is eccentric or the shaft is broken due to reducing abrasion, and the operation reliability of the water pump is reduced. The existing anti-freezing control of a heat pump water system does not aim at anti-freezing control under the conditions of water shortage and no water during anti-freezing operation, and the problems of device damage and the like are easy to occur.

disclosure of Invention

in view of the above, an object of the present invention is to provide an antifreeze control method, apparatus, heat pump water system, and storage medium capable of determining whether to use a no-water, or water-in-freeze operation mode based on a water flow rate value for performing an antifreeze operation.

according to an aspect of the present disclosure, there is provided an antifreeze control method including: detecting control parameters, and judging whether to enter an anti-freezing detection stage according to the control parameters; if yes, entering the anti-freezing detection stage, and detecting a water flow value for anti-freezing operation; determining an anti-freezing operation mode based on the water flow value, and performing corresponding anti-freezing operation control according to the anti-freezing operation mode; wherein the anti-freeze operation mode includes: a water-free anti-freezing operation mode, a water-shortage anti-freezing operation mode or a water-existence anti-freezing operation mode.

Optionally, the determining an anti-freeze operation mode based on the water flow rate value includes: judging whether the water flow value is greater than or equal to a preset flow threshold value or not; if so, determining that the anti-freezing operation mode is the water-containing anti-freezing operation mode; if not, judging whether the water flow value is 0, if so, determining that the anti-freezing operation mode is the waterless anti-freezing operation mode, and if not, determining that the anti-freezing operation mode is the water-shortage anti-freezing operation mode.

optionally, when the compressor is not in the working state, whether the control parameter meets an anti-freezing detection entering condition is judged, and if yes, the anti-freezing detection stage is entered.

Optionally, the control parameters include: ambient temperature, water inlet temperature and water outlet temperature; the freeze protection detection entry condition includes: the ambient temperature is less than or equal to T0, the influent temperature is less than or equal to T0 +. DELTA.t, or the effluent temperature is less than or equal to T0 +. DELTA.t; wherein, T0 is a first temperature threshold value, and Δ T is a temperature setting deviation.

Optionally, the detecting the water flow value for performing the anti-freeze operation includes: and starting the water pump to operate and detecting a water flow switch so as to detect the water flow value.

optionally, if the water flow value is 0, controlling the water pump to stop and setting a first water flow switch fault; entering a first cycle anti-freezing detection stage, and periodically controlling the water pump to start and stop; if the control parameter is judged to meet the anti-freezing detection entering condition during the shutdown of the water pump, clearing the fault of the first water flow switch, starting the water pump to operate and carrying out the water flow switch detection, and if the water flow value is 0, controlling the water pump to be shut down and setting the fault of the first water flow switch; and if the starting times of the water pump reach a preset first operation time threshold value, controlling the water pump to operate, and performing first anti-freezing operation control according to the waterless anti-freezing operation mode.

Optionally, the performing of the first anti-freeze operation control according to the non-water anti-freeze operation mode includes: shielding the water flow switch for detection, and entering a heating mode after the water pump runs for a preset first running time; wherein the first device operating in the heating mode comprises: a compressor; and exiting the first anti-freezing operation control based on a preset first anti-freezing operation exit condition.

Optionally, the exiting the first anti-freeze operation control based on the preset first anti-freeze operation exit condition includes: if the high-voltage protection condition is met, setting a high-voltage protection fault and controlling the compressor to stop; the compressor is periodically controlled to start and stop; when the shutdown time of the compressor reaches a preset first shutdown time length, clearing the high-pressure protection fault, controlling the compressor to start, and if the high-pressure protection condition is met, setting the high-pressure protection fault and controlling the compressor to shutdown; and under the condition that the starting times of the compressor reach a preset first starting time threshold, if the high-pressure protection condition is met, controlling the compressor and the water pump to stop, and setting and locking the high-pressure protection fault.

Optionally, the first device further comprises: a fan; the method further comprises the following steps: and under the condition that the starting times of the compressor reach a preset first starting time threshold, after the compressor and the water pump are stopped, controlling the fan to stop after a preset delay operation time period, and setting and locking the high-voltage protection fault.

Optionally, if the water flow value is judged to be greater than 0 and smaller than the flow threshold, controlling the water pump to stop and setting a second water flow switch fault; entering a second cycle anti-freezing detection stage, and periodically controlling the water pump to start and stop; if the control parameter is judged to meet the anti-freezing detection entering condition during the shutdown of the water pump, clearing the second flow switch fault, starting the water pump to operate and carrying out the flow switch detection, and if the flow value of the water flow is larger than 0 and smaller than the flow threshold value, controlling the water pump to shutdown and setting the second flow switch fault; and if the starting times of the water pump reach a preset second operation time threshold value, controlling the water pump to operate, and performing second anti-freezing operation control according to the water-shortage anti-freezing operation mode.

Optionally, the performing of the second anti-freeze operation control according to the water shortage anti-freeze operation mode includes: shielding the water flow switch for detection, and entering a heating mode after the water pump runs for a preset second running time; wherein the second device operating in the heating mode comprises: a compressor; and exiting the second anti-freezing operation control based on a preset second anti-freezing operation exit condition.

optionally, the exiting the second anti-freeze operation control based on the preset second anti-freeze operation exit condition includes: if the overheat protection condition is judged to be met, setting an overheat protection fault and controlling the compressor to stop; the compressor is periodically controlled to start and stop; when the shutdown time of the compressor reaches a preset second shutdown time, clearing the overheating protection fault, controlling the compressor to start, and if the overheating protection condition is met, setting the overheating protection fault and controlling the compressor to shutdown; and under the condition that the starting times of the compressor reach a preset second starting time threshold, if the overheat protection condition is met, controlling the compressor and the water pump to stop.

Optionally, if the water flow value is greater than or equal to the flow threshold, entering a third periodic anti-freezing detection stage, and periodically controlling the water pump to start and stop until the control parameters meet the anti-freezing operation conditions of the heat pump after the compressor is not in the working state; performing third freeze prevention operation control according to the water-containing freeze prevention operation mode; if the control parameter meets the anti-freezing detection entry condition, the water pump is periodically controlled to be started; after the water pump is started, if the difference between the outlet water temperature and the inlet water temperature is smaller than or equal to a preset temperature difference threshold value, the water pump is controlled to be stopped and restarted after a preset third stop time period.

Optionally, determining a starting minimum starting operation period of the water pump based on a preset circulating water storage amount and the highest gear operation water flow of the water pump; and in a third period anti-freezing detection stage, setting the periodic operation time length of the water pump to be more than or equal to the starting minimum starting operation period, and setting the third stop time length as a preset stop interval period of the water pump.

optionally, the heat pump antifreeze operating conditions include: the ambient temperature is less than or equal to T1, the influent temperature is less than or equal to T1 +. DELTA.t, or the effluent temperature is less than or equal to T1 +. DELTA.t; wherein the T1 is a second temperature threshold, and T1 < T0.

optionally, the performing of the third freeze prevention operation control according to the water-existence freeze prevention operation mode includes: if the inlet water temperature or the outlet water temperature is determined to be less than or equal to T1+ the first set value, entering a heat pump operation anti-freezing stage, and controlling the water pump to start to operate at a high gear; if the inlet water temperature or the outlet water temperature is determined to be less than or equal to T1-a second set value, entering a heat pump operation anti-freezing stage, starting a heating mode and controlling a third device to operate; wherein the third device comprises: the water pump and the compressor; and judging that the water inlet temperature or the water outlet temperature is less than the anti-freezing exit temperature threshold, if not, exiting the anti-freezing stage of the heat pump operation, and controlling the third equipment to shut down.

According to another aspect of the present disclosure, there is provided an anti-freeze control apparatus including: the parameter detection module is used for detecting control parameters and judging whether to enter an anti-freezing detection stage according to the control parameters; the water quantity detection module is used for entering an anti-freezing detection stage and detecting a water flow value for anti-freezing operation if the water quantity detection module is used for entering the anti-freezing detection stage; the anti-freezing control module is used for determining an anti-freezing operation mode based on the water flow value and correspondingly controlling anti-freezing operation according to the anti-freezing operation mode; wherein the anti-freeze operation mode includes: a water-free anti-freezing operation mode, a water-shortage anti-freezing operation mode or a water-existence anti-freezing operation mode.

According to still another aspect of the present disclosure, there is provided an antifreeze control apparatus including: the method comprises the following steps: a memory; and a processor coupled to the memory, the processor configured to perform the method as described above based on instructions stored in the memory.

According to yet another aspect of the present disclosure, a heat pump water system includes the antifreeze control apparatus as described above.

According to yet another aspect of the present disclosure, a computer-readable storage medium is provided, which stores computer instructions for execution by a processor to perform the method as described above.

the anti-freezing control method, the anti-freezing control device, the heat pump water system and the storage medium can respectively control the completely water-free state, the water-deficient state and the water-containing state of the heat pump water system, improve the reliability of anti-freezing control, reduce the risks of equipment damage and the like, improve the product quality and reduce the maintenance cost.

Drawings

in order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without inventive exercise.

FIG. 1 is a schematic flow chart diagram illustrating one embodiment of an antifreeze control method according to the present disclosure;

FIG. 2 is a schematic flow chart diagram illustrating the determination of an antifreeze operating mode according to one embodiment of the antifreeze control method of the present disclosure;

FIG. 3 is a schematic diagram of the operation of the system of one embodiment of a heat pump water system;

FIG. 4 is a schematic flow chart illustrating cycle detection for a no water freeze operation mode in accordance with an embodiment of the freeze protection control method of the present disclosure;

FIG. 5 is a schematic control flow diagram for a waterless antifreeze mode of operation according to an embodiment of the antifreeze control method of the present disclosure;

FIG. 6 is a schematic diagram of the detection and control sequence of the water pump water system for the waterless antifreeze operation mode;

FIG. 7 is a schematic flow chart illustrating cycle detection for a water-out freeze protection mode of operation according to one embodiment of the freeze control method of the present disclosure;

FIG. 8 is a schematic control flow diagram for a water-out antifreeze mode of operation according to an embodiment of the antifreeze control method of the present disclosure;

FIG. 9 is a schematic diagram of the detection and control sequence for a water-starved antifreeze mode of operation of the heat pump water system;

FIG. 10 is a schematic flow chart illustrating cycle detection for a water antifreeze mode of operation according to an embodiment of the antifreeze control method of the present disclosure;

FIG. 11 is a schematic control flow diagram for a water antifreeze mode of operation according to an embodiment of the antifreeze control method of the present disclosure;

FIG. 12 is a schematic diagram of the detection and control sequence of the water antifreeze operation mode of the heat pump water system;

FIG. 13 is a timing diagram of an anti-freeze detection phase of the heat pump water system for periodic operation of the water pump in the water anti-freeze run mode;

FIG. 14 is a timing diagram illustrating the freeze protection phase of a heat pump water system for a water freeze protection mode of operation of the heat pump;

FIG. 15 is a block schematic diagram of an embodiment of an antifreeze control apparatus according to the present disclosure;

FIG. 16 is a block schematic diagram of an antifreeze control module according to an embodiment of the antifreeze control apparatus of the present disclosure;

FIG. 17 is a block schematic diagram of another embodiment of an antifreeze control apparatus according to the present disclosure.

Detailed Description

the present disclosure now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the disclosure are shown. The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

the terms "first", "second", and the like are used hereinafter only for descriptive distinction and not for other specific meanings.

FIG. 1 is a schematic flow diagram of an embodiment of an antifreeze control method according to the present disclosure, as shown in FIG. 1:

And 101, detecting control parameters, and judging whether to enter an anti-freezing detection stage according to the control parameters.

The control parameters may be of various kinds, such as ambient temperature, inlet water temperature, outlet water temperature, etc. The water inlet temperature and the water outlet temperature can be the water inlet temperature and the water outlet temperature of circulating water of the heat pump water system, and real-time detection can be carried out by arranging detection devices such as a temperature bag.

And 102, if so, entering an anti-freezing detection stage, and detecting a water flow value for anti-freezing operation.

and 103, determining an anti-freezing operation mode based on the water flow value, and performing corresponding anti-freezing operation control according to the anti-freezing operation mode. The anti-freezing operation mode comprises the following steps: a water-free anti-freezing operation mode, a water-shortage anti-freezing operation mode or a water-existence anti-freezing operation mode.

The anti-freezing control method in the embodiment can respectively perform anti-freezing control on the completely water-free state, the water-deficient state and the water state of the heat pump water system, can improve the reliability of anti-freezing control, and reduces the risks of equipment damage and the like.

FIG. 2 is a schematic flow chart illustrating the determination of an antifreeze operating mode according to an embodiment of the antifreeze control method of the present disclosure, as shown in FIG. 2:

step 201, when the compressor is not in the working state, detecting the control parameter.

And step 202, judging whether the control parameters meet the anti-freezing detection entering conditions, if so, entering step 203, and if not, returning.

the freeze protection detection entry conditions may be various, for example, including: the ambient temperature is less than or equal to T0, the water inlet temperature is less than or equal to T0 +. DELTA.t or the water outlet temperature is less than or equal to T0 +. DELTA.t. T0 is a first temperature threshold, Δ T is a temperature setting deviation, and Δ T is a positive value. For example, if the ambient temperature is less than or equal to T0 and the intake water temperature is less than or equal to T0 +. Δ T, it is determined that the control parameter satisfies the antifreeze detection entry condition. The flow rate value of the water for the freeze preventing operation may be detected in various ways, for example, by starting the water pump operation and detecting a flow switch for detecting the flow rate value. The water flow switch can be a target sheet type water flow switch and the like.

And step 203, entering an anti-freezing detection stage, and detecting a water flow value for anti-freezing operation.

And step 204, judging whether the water flow value is greater than or equal to a preset flow threshold value, if so, entering step 205, and if not, entering step 206. The flow threshold may be set, for example, the flow threshold may be a water flow switch off value, or the like.

and step 205, determining that the anti-freezing operation mode is a water-containing anti-freezing operation mode.

And step 206, judging whether the water flow value is 0, if so, entering step 207, and if not, entering step 208.

And step 207, determining that the anti-freezing operation mode is a waterless anti-freezing operation mode.

And step 208, determining that the anti-freezing operation mode is a water-shortage anti-freezing operation mode.

in one embodiment, as shown in fig. 3, a heat pump water system is known, in which a compressor is used to compress refrigerant gas of low temperature and low pressure into refrigerant gas of high temperature and high pressure, and to circulate the refrigerant in a refrigeration system normally. The gas-liquid separator is used for separating compressor lubricating oil and liquid refrigerant carried in refrigerant steam. The four-way valve is used for adjusting the flow direction of the refrigerant and realizing the conversion of heating and refrigerating of the heat pump unit.

The finned tube heat exchanger is used for cooling and condensing high-temperature and high-pressure refrigerant superheated steam discharged by a compressor into liquid during refrigeration, and heat emitted by the refrigerant is taken away by a cooling medium. The double pipe heat exchanger (water side heat exchanger) is used for cooling by evaporating (boiling) liquid refrigerant at low pressure, converting into vapor and absorbing heat of the cooled medium. When heating, the superheated steam of the high-temperature and high-pressure refrigerant is cooled and condensed into liquid, and the heat released by the refrigerant is taken away by a cooling medium.

The electronic expansion valve (throttle part) is a throttle element, and the liquid supply quantity is adjusted to match the load of the evaporator, so that the supplied refrigerant liquid quantity to the outlet of the evaporator can be completely evaporated. The water pump provides power to drive the water circuit of the water system to circulate. The water flow switch is used for judging water flow, and when the water flow is too low, the water flow switch is disconnected.

The heating cycle principle of the heat pump water system is as follows: when the unit is in heating operation, the four-way valve is powered on, compressed high-temperature and high-pressure refrigerant vapor is directly discharged into the water side heat exchanger through the four-way valve to emit heat to air-conditioning water, condensed refrigerant liquid flows through the expansion valve for throttling and pressure reduction, then the condensed refrigerant liquid absorbs the heat of the environment in the air-cooled heat exchanger to be evaporated, and then the condensed refrigerant liquid is sucked into the compressor to be compressed and discharged, so that a heat pump cycle is formed. The air conditioning water absorbs the heat emitted by the high-temperature and high-pressure refrigerant, then is heated to a preset temperature and is pumped into an air conditioning area by a water pump, so that a heating effect is generated.

The refrigeration cycle principle of the heat pump water system is as follows: in the refrigeration process, the four-way valve is powered off, the compressed high-temperature and high-pressure refrigerant vapor is directly discharged into the fin heat exchanger through the four-way valve to release heat, the condensed refrigerant liquid flows through the expansion valve to be throttled and decompressed, then the heat on the water side is absorbed in the heat exchanger on the water side to be evaporated, and then the heat is sucked into the compressor to be compressed and discharged, so that the heat pump cycle is formed. The low-temperature refrigerant absorbs heat from the air-conditioning water to evaporate, and the temperature of the air-conditioning water is reduced accordingly and is pumped into the air-conditioning area by the water pump, thereby generating a cooling effect.

FIG. 4 is a schematic diagram of a cycle detection flow for a waterless antifreeze operating mode according to an embodiment of the antifreeze control method of the present disclosure, as shown in FIG. 4:

Step 401, starting the water pump to operate and detecting a water flow switch to detect a water flow value. The water flow rate value may be detected by a flow meter or the like provided at the water flow switch. The water pump may be a canned pump or the like.

And 402, if the water flow value is 0, controlling the water pump to stop and setting a first water flow switch to have a fault.

and step 403, entering a first cycle anti-freezing detection stage, and periodically controlling the water pump to start and stop.

In the process of periodically controlling the start and stop of the water pump, if the control parameters meet the anti-freezing detection entering conditions during the stop of the water pump, the first water flow switch fault is cleared, the water pump is started to operate and the water flow switch is detected, and if the water flow value is 0, the water pump is controlled to stop and the first water flow switch fault is set.

And step 404, if the starting times of the water pump reach a preset first operation time threshold, controlling the water pump to operate, and performing first anti-freezing operation control according to the anhydrous anti-freezing operation mode. The first operation number threshold may be set, for example, 5, 6, etc.

In one embodiment, there may be a plurality of control methods for the first antifreeze operation control according to the non-water antifreeze operation mode. FIG. 5 is a schematic control flow diagram for the waterless antifreeze operating mode according to an embodiment of the antifreeze control method of the present disclosure, as shown in FIG. 5:

Step 501, shielding water flow switch detection, and entering a heating mode after the water pump runs for a preset first running time.

the first operation time period may be 120s, 130s, etc. The first equipment operating in the heating mode includes a compressor and the like, and the first anti-freeze operation control is exited based on a preset first anti-freeze operation exit condition, and there may be various control methods.

Step 502, if the high-pressure protection condition is met, setting a high-pressure protection fault and controlling the compressor to stop. The high pressure protection condition may be various, for example, the high pressure protection condition includes a high discharge pressure of the compressor exceeding a preset pressure threshold, and the like.

And step 503, periodically controlling the compressor to start and stop.

And when the shutdown time of the compressor reaches the preset first shutdown duration, clearing the high-pressure protection fault, controlling the compressor to start, and if the high-pressure protection condition is met, setting the high-pressure protection fault and controlling the compressor to shutdown. The first shutdown period may be set, for example, to 3, 4min, etc.

And step 504, under the condition that the starting times of the compressor reach a preset first starting time threshold, if a high-pressure protection condition is met, the compressor and the water pump are controlled to stop, and a high-pressure protection fault is set and locked.

The first activation number threshold may be set, for example, to 3, 4, 5, etc. After the high-voltage protection fault is locked, the fan, the compressor, the water pump and the like are not allowed to be started, the high-voltage protection fault can be restored only by power-off, power-on and the like, and the fan, the compressor, the water pump and the like are allowed to be started.

The first equipment further comprises a fan, and under the condition that the starting times of the compressor reach a preset first starting time threshold, the fan is controlled to be stopped after the compressor and the water pump are stopped and the operation is delayed for a preset time, and high-voltage protection faults are set and locked. The delay operation time period may be 60s, etc.

In one embodiment, as shown in fig. 6, when the compressor is not in the working state, the ambient temperature tmen is less than or equal to the first temperature threshold T0, the water inlet temperature tmin is less than or equal to T0+ temperature setting deviation Δ T, or the water outlet temperature tmout is less than or equal to T0+ Δ T, the heat pump water system enters a dynamic anti-freezing detection stage of the periodic operation of the water pump, and the preset value of Δ T may be 1 ℃.

After the water pump is started, entering a pre-detection stage of anti-freezing operation water flow k, detecting the on-off state of the water flow switch after the water pump operates for 15s, and if the target sheet of the water flow switch is detected to be off and the detected water flow value is 0 for 10s continuously, setting a first water flow switch fault.

In the dynamic anti-freezing detection stage of the periodic operation of the water pump, the 'first water flow switch fault' can be recovered, and the 'first water flow switch fault' can be normally cleared after the water pump is stopped. If the T water inlet and T water outlet temperature sensing bulbs are detected again in the shutdown period and the dynamic anti-freezing detection condition of the periodic operation of the water pump is met, namely the T environment is less than or equal to T0, the T water inlet is less than or equal to T0 +. DELTA.t or the T water outlet is less than or equal to T0 +. DELTA.t, the water pump is restarted and the on-off condition of the water flow switch is detected again.

And if the recoverable 'first water flow switch fault' is continuously detected and the number of times of detecting the water flow value to be 0 is 5 times, judging that the heat pump water system is in a completely anhydrous state (k is 0 and k is the anti-freezing operation water flow), and entering an anhydrous anti-freezing operation mode. And (4) shielding water flow switch detection, controlling the heat pump water system to enter a heating mode (without judging the conditions of environment, water inlet, water outlet and anti-freezing temperature) after the water pump runs for 120s for the first running time, and fixing the frequency of the compressor to be 40 Hz.

and during the detection period of the water flow switch, if the heat pump water system meets the high-voltage protection condition, setting a high-voltage protection fault and stopping according to a fault time sequence. After the high-voltage protection fault is eliminated and the compressor is stopped for the first stop time of 3min, the heat pump water system is controlled to enter a heating mode (conditions of environment, water inlet, water outlet and anti-freezing temperature are not judged), and the frequency of the compressor is fixed to be 40 Hz. The first activation number threshold may be set to 2, 3, etc.

Under the condition that the starting times of the compressor reach a preset first starting time threshold, if a high-pressure protection condition is met, the compressor and the water pump are controlled to stop immediately, the fan operates in a delayed mode for a preset delay operation time of 60s and then stops, high-pressure protection faults are set and locked, the fan, the compressor, the water pump and the like are not allowed to start, and the high-pressure protection faults can be recovered only when the power is off and on. And after the automatic anti-freezing or power-off and power-on are quitted, the detection of the water flow switch is recovered.

And the unit tries to start the water pump without limit after meeting the anti-freezing condition, and the starting interval of the water pump is about 30 s. Under the condition that a heat pump water system is completely free of water or a user goes out in winter and water of the water system is discharged without power failure, a sliding bearing of the water pump is lack of a water lubricating medium, so that dry grinding of a water pump bearing is caused, the water pump bearing is eccentric or the shaft is broken due to reducing wear caused by long-term accumulation (the application requirement of a shield pump strictly prohibits the dry grinding operation of the water-free lubrication), and the maintenance cost of components is increased. The anti-freezing control method provided by the embodiment can solve the problems that the control fault of the heat pump water system can be recovered without limitation and the anti-freezing operation is started to operate frequently, and reduces the maintenance cost of components.

FIG. 7 is a schematic diagram illustrating a cycle detection flow for a water-out antifreeze mode of operation according to an embodiment of the antifreeze control method of the present disclosure, as shown in FIG. 7:

And step 701, starting the water pump to operate, detecting a water flow switch and detecting a water flow value.

and step 702, if the water flow value is judged to be larger than 0 and smaller than the flow threshold value, controlling the water pump to stop and setting a second water flow switch to have a fault.

And 703, entering a second cycle anti-freezing detection stage, and periodically controlling the water pump to start and stop.

in the process of periodically controlling the water pump to start and stop, if the control parameters meet the anti-freezing detection entering conditions during the stop of the water pump, the second water flow switch fault is cleared, the water pump is started to operate and the water flow switch detection is carried out, and if the water flow value is larger than 0 and smaller than the flow threshold value, the water pump is controlled to stop and the second water flow switch fault is set.

and 704, if the starting times of the water pump reach a preset second operation time threshold, controlling the water pump to operate, and performing second anti-freezing operation control according to the water shortage anti-freezing operation mode. The second operation number threshold may be set, for example, 1, 2, etc.

In one embodiment, there may be a plurality of control methods for the second anti-freeze operation control according to the water shortage anti-freeze operation mode. FIG. 8 is a schematic control flow diagram for a water-out antifreeze operation mode according to an embodiment of the antifreeze control method of the present disclosure, as shown in FIG. 8:

and step 801, shielding the detection of the water flow switch, and entering a heating mode after the water pump runs for a preset second running time. The second operation time period may be 120s, 130s, etc.

The second device operating in the heating mode includes a compressor and the like, and the second anti-freeze operation control is exited based on a preset second anti-freeze operation exit condition, and there may be various control methods.

and step 802, if the overheat protection condition is judged to be met, setting an overheat protection fault and controlling the compressor to stop. The overheat protection condition may be various, for example, the overheat protection condition includes that the outlet water temperature exceeds a preset temperature threshold value, and the like.

and step 803, periodically controlling the compressor to start and stop.

and when the shutdown time of the compressor reaches the preset second shutdown time length, clearing the overheating protection fault, controlling the compressor to start, and if the overheating protection condition is met, setting the overheating protection fault and controlling the compressor to shutdown. The second shutdown period may be set, for example, to 3, 4min, etc.

And step 804, under the condition that the starting frequency of the compressor reaches a preset second starting frequency threshold value, if an overheat protection condition is met, controlling the compressor and the water pump to stop. The second activation number threshold may be 1, 2, etc. If the second activation number threshold is 1, the heating mode may be entered only once.

In one embodiment, as shown in fig. 9, when the compressor is not in the working state, the T environment is less than or equal to T0, the T inlet water is less than or equal to T0 +. DELTA.t, or the T outlet water is less than or equal to T0 +. DELTA.t, the dynamic freeze-proofing detection phase of the periodic operation of the water pump is entered. And (3) starting the water pump to perform a pre-detection stage of anti-freezing operation water flow k, detecting the on-off of the water flow switch after the water pump operates for 15s, detecting the disconnection of a water flow switch target sheet for 10s continuously, and setting a second water flow switch fault when the detected water flow value is larger than 0 and smaller than a flow threshold value.

In the anti-freezing detection stage of the periodic operation of the water pump, the 'second flow switch fault' can be recovered, and the 'second flow switch fault' can be normally cleared after the water pump is stopped. And if the T water inlet and the T water outlet temperature sensing bulb are not in fault during the shutdown period, and the dynamic anti-freezing detection condition of the periodic operation of the water pump is met, namely the T environment is less than or equal to T0, the T water inlet is less than or equal to T0+ delta T or the T water outlet is less than or equal to T0+ delta T, restarting the water pump, and detecting the on-off condition of the water flow switch again.

And if the recoverable second water flow switch fault is continuously detected and the detected water flow value is more than 0 and less than the flow threshold value for 5 times, judging that the heat pump water system is in a serious water shortage state (k is more than 0 and less than the flow threshold value), and entering a water shortage anti-freezing operation mode. And (4) shielding the detection of a water flow switch, controlling the heat pump water system to enter a heating mode (without judging the conditions of environment, water inlet, water outlet and anti-freezing temperature) after the water pump operates for 120s for the second operation time, and fixing the frequency of the compressor to be 40 Hz.

During the detection period of the shielding water flow switch, if the heat pump water system meets an overheat protection condition, an overheat protection fault is set and the heat pump water system is stopped according to a fault time sequence, after the overheat protection fault is cleared and the compressor is stopped for 3min, the heat pump water system is controlled to enter a heating mode (the conditions of environment, water inlet, water outlet and anti-freezing temperature are not judged), and the frequency of the compressor is fixed to be 40 Hz.

The second starting time threshold value can be set to be 1, 2 and the like, and under the condition that the starting time of the compressor reaches the second starting time threshold value, if the overheat protection condition is met, the compressor and the water pump are controlled to stop immediately, and an overheat protection fault is set and can be recovered without limit. And recovering the detection of the water flow switch after the automatic anti-freezing operation is quitted or the power is cut off and electrified.

The problem that air is not completely exhausted from the engineering side of a heat pump water system or air pocket/air resistance occurs after long-term standing is solved, so that ' water flow switch failure ' occurs when the heat pump water system is started for the first time and is operated in an anti-freezing mode ', the ' water flow switch failure ' cannot be recovered once, the anti-freezing operation is completely failed, the whole machine, a pipe network and tail end stored water are cooled to the freezing point normally and then are frozen, damage is caused to pipelines, heat exchangers and the like, and the maintenance cost of the. The anti-freezing control method provided in the above embodiment can solve the problem that the anti-freezing operation is completely ineffective after the anti-freezing fault occurs, reduce the damage to the pipeline, the heat exchanger and the like, and reduce the maintenance cost of the heat pump water system.

FIG. 10 is a schematic diagram of a cycle detection flow for a water antifreeze mode of operation according to an embodiment of the antifreeze control method of the present disclosure, as shown in FIG. 10:

and 1001, starting the water pump to operate, detecting a water flow switch and detecting a water flow value.

Step 1002, if the water flow value is greater than or equal to the flow threshold, entering a third cycle anti-freezing detection stage, and periodically controlling the water pump to start and stop until the control parameters meet the anti-freezing operation conditions of the heat pump after the compressor is not in the working state; and performing third freeze prevention operation control according to the water-containing freeze prevention operation mode.

and in the process of periodically controlling the water pump to start and stop, if the control parameter meets the anti-freezing detection entry condition, periodically controlling the water pump to start. And after the water pump is started, if the difference between the outlet water temperature and the inlet water temperature is less than or equal to a preset temperature difference threshold value, controlling the water pump to stop and restart after a preset third stop time period. The temperature difference threshold may be set, for example, to 0.2, 0.5 ℃, etc.

In one embodiment, the start-up minimum on-time operation period of the water pump is determined based on a preset circulating water storage amount and a highest gear operation water flow amount of the water pump. And in the third period anti-freezing detection stage, setting the periodic operation time length of the water pump to be more than or equal to the starting minimum starting operation period, and setting the third shutdown time length as the preset stopping interval period of the water pump.

the heat pump antifreeze operating conditions can be various, for example, the heat pump antifreeze operating conditions include: the ambient temperature is less than or equal to T1, the water inlet temperature is less than or equal to T1 +. DELTA.t, or the water outlet temperature is less than or equal to T1 +. DELTA.t, T1 is a second temperature threshold, and T1 < T0.

There may be various control methods for the third freeze prevention operation control according to the water freeze prevention operation mode. FIG. 11 is a schematic control flow diagram for the water antifreeze operating mode according to an embodiment of the antifreeze control method of the present disclosure, as shown in FIG. 11:

And 1101, if the inlet water temperature or the outlet water temperature is determined to be less than or equal to T1+ the first set value, entering a heat pump operation anti-freezing stage, and controlling the water pump to start to operate at a high gear.

Step 1102, if the inlet water temperature or the outlet water temperature is determined to be less than or equal to T1-the second set value, entering a heat pump operation anti-freezing stage, starting a heating mode and controlling the third equipment to operate. The third equipment comprises a water pump, a compressor and the like.

And 1103, judging that the inlet water temperature or the outlet water temperature is lower than the anti-freezing exit temperature threshold, if not, exiting the anti-freezing stage of the heat pump operation, and controlling the third equipment to shut down.

In one embodiment, as shown in fig. 12 to 14, when the compressor is not in the working state, and T environment is less than or equal to T0, T inlet water is less than or equal to T0 +. DELTA.t, or T outlet water is less than or equal to T0 +. DELTA.t, the heat pump water system enters the dynamic freeze protection detection phase of the periodic operation of the water pump.

And (3) a dynamic anti-freezing detection stage of the periodic operation of the water pump: and obtaining the circulating water storage quantity QV of the hot water system and the highest gear running water flow qm of the water pump preset according to the machine type, setting the starting minimum starting running period of the water pump as Tmin, and obtaining the preset stopping interval period of the water pump as Tstop. Wherein Tmin is QV/qm. And after the water pump is periodically operated and started, the operation time T is more than or equal to Tmin, and if T water outlet and T water inlet in 30s are continuously detected to be less than or equal to 0.5 ℃, the water pump is periodically operated and quitted.

And after the water pump is periodically stopped T and stopped, the water pump is re-started to periodically run and start, the running time T is more than or equal to Tmin, and if T water outlet and T water inlet in 30s are continuously detected to be less than or equal to 0.5 ℃, the water pump is periodically run and quit. And circulating to and fro until the control parameters meet the anti-freezing operation condition of the heat pump after the compressor is not in the working state, and entering the stage of the anti-freezing operation of the heat pump.

The heat pump operation anti-freezing stage of the heat pump anti-freezing operation comprises the following steps: and when the compressor is not in the working state, the T environment is less than or equal to a second temperature threshold T1, T water inflow is less than or equal to T1+ Deltat or T water outflow is less than or equal to T1+ Deltat (wherein T1 is less than T0), entering a heat pump operation anti-freezing stage of a water anti-freezing operation mode.

and if T water inflow or T water outflow is detected and stored for 30 seconds continuously and is less than or equal to T1+1, entering a heat pump operation anti-freezing stage, and starting the water pump to operate at a high gear. And if T inlet water is detected and stored for 30 seconds continuously or T outlet water is less than or equal to T1-2, entering a heat pump operation anti-freezing stage, starting the water pump and the compressor to operate according to a logic time sequence, and starting a heating mode of the whole heat pump water system. And if T water inflow is detected and stored for 30 seconds continuously or T water outflow is less than the anti-freezing exit temperature threshold T anti-freezing exit, the anti-freezing heating is maintained in the current state. And if the T water inflow is detected and stored for 30 seconds continuously or the T water outflow is more than or equal to T anti-freezing exit, the anti-freezing operation exits, and the machine is shut down according to the control logic time sequence.

The anti-freezing control method provided in the above embodiment can respectively control the completely water-free state, the water-deficient state and the water-existing state of the heat pump water system, so that the reliability of anti-freezing control is improved, and the risk of equipment damage and the like is reduced.

In one embodiment, as shown in FIG. 15, the present disclosure provides an antifreeze control apparatus 150 comprising: a parameter detection module 1501, a water amount detection module 1502, and an anti-freeze control module 1503. The parameter detection module 1501 detects the control parameters and judges whether to enter an anti-freezing detection stage according to the control parameters; if yes, the water amount detection module 1502 enters an anti-freezing detection stage to detect a water flow value for performing an anti-freezing operation.

The anti-freezing control module 1503 determines an anti-freezing operation mode based on the water flow value and performs corresponding anti-freezing operation control according to the anti-freezing operation mode; wherein, the anti-freezing operation mode comprises: a water-free anti-freezing operation mode, a water-shortage anti-freezing operation mode or a water-existence anti-freezing operation mode.

in one embodiment, the parameter detecting module 1501 determines whether the control parameter satisfies the antifreeze detection entering condition when the compressor is not in the operating state, and enters the antifreeze detection stage if the control parameter satisfies the antifreeze detection entering condition. The control parameters include: ambient temperature, water inlet temperature and water outlet temperature; the freeze protection detection entry conditions include: ambient temperature less than or equal to T0; the water inlet temperature is less than or equal to T0 +. DELTA.t or the water outlet temperature is less than or equal to T0 +. DELTA.t; where T0 is the first temperature threshold and Δ T is the temperature setting deviation.

The water amount detection module 1502 starts the water pump and performs a water flow switch detection to detect the water flow value. The anti-freezing control module 1503 judges whether the water flow value is greater than or equal to a preset flow threshold value; if so, the antifreeze control module 1503 determines that the antifreeze operation mode is a water antifreeze operation mode; if not, the anti-freezing control module 1503 determines whether the water flow value is 0, if so, the anti-freezing control module 1503 determines that the anti-freezing operation mode is the waterless anti-freezing operation mode, and if not, the anti-freezing control module 1503 determines that the anti-freezing operation mode is the water-shortage anti-freezing operation mode.

In one embodiment, as shown in FIG. 16, the antifreeze control module 1503 includes: a first control unit 1505, a second control unit 1506 and a third control unit 1507. If the water flow value is 0, the first control unit 1505 controls the water pump to stop and sets the first water flow switch to fail; the first control unit 1505 controls to enter a first periodic anti-freezing detection stage, and periodically controls the water pump to start and stop; wherein, if it is determined during the shutdown of the water pump that the control parameter satisfies the anti-freeze detection entry condition, the first control unit 1505 clears the first flow switch fault, starts the operation of the water pump and performs the flow switch detection, and if the flow value of the water flow is 0, the first control unit 1505 controls the shutdown of the water pump and sets the first flow switch fault;

if the number of times of starting the water pump reaches a preset first operation number threshold, the first control unit 1505 controls the operation of the water pump, and performs a first anti-freeze operation control according to the anhydrous anti-freeze operation mode.

in one embodiment, the first control unit 1505 masks the water flow switch detection and enters the heating mode after the water pump is operated for a preset first operation duration; wherein the first device operating in the heating mode comprises: a compressor; the first control unit 1505 exits the first antifreeze operation control based on a preset first antifreeze operation exit condition.

If the high-pressure protection condition is satisfied, the first control unit 1505 sets a high-pressure protection fault and controls the compressor to stop; the first control unit 1505 controls the start and stop of the compressor periodically; wherein, when the shutdown time of the compressor reaches a preset first shutdown time, the first control unit 1505 clears the high-pressure protection fault and controls the compressor to start, and if the high-pressure protection condition is satisfied, the first control unit 1505 sets the high-pressure protection fault and controls the compressor to shutdown; in the case where the number of starts of the compressor reaches a preset first start number threshold, if a high-pressure protection condition is satisfied, the first control unit 1505 controls the compressor and the water pump to stop, setting and locking a high-pressure protection fault.

The first device further includes a fan, and the first control unit 1505 controls the fan to stop after running for a preset delay running time period after the compressor and the water pump are stopped and sets and locks the high-voltage protection fault under the condition that the starting times of the compressor reaches a preset first starting time threshold.

in one embodiment, if it is determined that the water flow rate value is greater than 0 and less than the flow rate threshold value, the second control unit 1506 controls the water pump to be stopped and sets the second water flow switch to malfunction. The second control unit 1506 controls the water pump to enter a second period anti-freezing detection stage, and periodically controls the water pump to start and stop; if the control parameters meet the anti-freezing detection entering conditions during the shutdown of the water pump, the second control unit 1506 clears the second water flow switch fault, the water pump is started to operate and the water flow switch detection is carried out, and if the water flow value is larger than 0 and smaller than the flow threshold value, the second control unit 1506 controls the water pump to be shut down and sets the second water flow switch fault;

if the number of times of starting the water pump reaches a preset second operation number threshold, the second control unit 1506 controls the operation of the water pump, and performs second anti-freeze operation control according to the water-shortage anti-freeze operation mode.

the second control unit 1506 shields the detection of the water flow switch, and enters a heating mode after the water pump operates for a preset second operation time; wherein the second apparatus operating in the heating mode comprises: a compressor; the second control unit 1506 exits the second antifreeze operation control based on a preset second antifreeze operation exit condition.

the second control unit 1506 sets an overheat protection fault and controls the compressor to stop if it is determined that the overheat protection condition is satisfied. The second control unit 1506 periodically controls the start and stop of the compressor; when the shutdown time of the compressor reaches a preset second shutdown time, the second control unit 1506 clears the overheat protection fault and controls the compressor to start, and if the overheat protection condition is met, the second control unit 1506 sets the overheat protection fault and controls the compressor to shutdown; in the case where the number of starts of the compressor reaches a preset second start number threshold, if the overheat protection condition is satisfied, the second control unit 1506 controls the compressor and the water pump to stop.

In one embodiment, if the water flow value is greater than or equal to the flow threshold value, the third control unit 1507 controls the water pump to enter a third periodic anti-freezing detection phase, the third control unit 1507 periodically controls the water pump to start and stop until the control parameter meets the anti-freezing operation condition of the heat pump after the compressor is not in the working state, and the third control unit 1507 performs a third anti-freezing operation control according to the water-bearing anti-freezing operation mode.

If the control parameter satisfies the anti-freeze detection entry condition, the third control unit 1507 periodically controls the water pump to start; after the water pump is started, if a difference between the outlet water temperature and the inlet water temperature is less than or equal to a preset temperature difference threshold, the third control unit 1507 controls the water pump to be stopped and restarted after a preset third stop time period elapses.

The third control unit 1507 determines a starting minimum starting operation period of the water pump based on a preset circulating water storage amount and the highest gear operation water flow rate of the water pump; the third control unit 1507 sets the periodic operation time length of the water pump to be greater than or equal to the starting minimum operation period in the third period anti-freezing detection stage, and sets the third shutdown time length to be the preset stopping interval period of the water pump.

The anti-freezing operation conditions of the heat pump comprise: the ambient temperature is less than or equal to T1, the water inlet temperature is less than or equal to T1 +. DELTA.t, or the water outlet temperature is less than or equal to T1 +. DELTA.t; wherein T1 is the second temperature threshold, and T1 < T0.

If the inlet water temperature or the outlet water temperature is determined to be less than or equal to T1+ the first set value, the third control unit 1507 enters a heat pump operation anti-freezing stage to control the water pump to start operation at a high gear; if it is determined that the temperature of the inlet water or the temperature of the outlet water is less than or equal to T1 — the second set value, the third control unit 1507 enters an anti-freeze phase of the heat pump operation, turns on a heating mode and controls a third device to operate, the third device including: water pumps, compressors, etc. The third control unit 1507 determines that the inlet water temperature or the outlet water temperature is lower than the anti-freezing exit temperature threshold, if not, the heat pump operation anti-freezing stage exits, and the third control unit 1507 controls the third device to shut down.

FIG. 17 is a block schematic diagram of another embodiment of an antifreeze control apparatus according to the present disclosure. As shown in fig. 17, the apparatus may include a memory 1701, a processor 1702, a communication interface 1703, and a bus 1704. The memory 1701 is used to store instructions, the processor 1702 is coupled to the memory 1701, and the processor 1702 is configured to implement the above-described anti-freeze control method based on the instructions stored in the memory 1701.

The memory 1701 may be a high-speed RAM memory, a non-volatile memory (non-volatile memory), or the like, or the memory 1701 may be a memory array. The memory 1701 may also be partitioned and the blocks may be combined into virtual volumes according to certain rules. The processor 1702 may be a central processing unit CPU, or an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement the freeze protection control methods of the present disclosure.

In one embodiment, the present disclosure provides a heat pump water system including the above anti-freeze control apparatus.

In one embodiment, the present disclosure provides a computer-readable storage medium having stored thereon computer instructions for execution by a processor to perform a method as in any of the above embodiments.

The anti-freezing control method, the anti-freezing control device, the heat pump water system and the storage medium provided in the above embodiments can respectively perform anti-freezing operation control on a completely water-free state, a water-deficient state and a water-existing state of the heat pump water system, improve the reliability of anti-freezing control, and reduce risks such as equipment damage.

The method and system of the present disclosure may be implemented in a number of ways. For example, the methods and systems of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above unless specifically stated otherwise. Further, in some embodiments, the present disclosure may also be embodied as programs recorded in a recording medium, the programs including machine-readable instructions for implementing the methods according to the present disclosure. Thus, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.

The description of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the disclosure and the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated.

Claims (20)

1. an antifreeze control method comprising:

detecting control parameters, and judging whether to enter an anti-freezing detection stage according to the control parameters;

If yes, entering the anti-freezing detection stage, and detecting a water flow value for anti-freezing operation;

Determining an anti-freezing operation mode based on the water flow value, and performing corresponding anti-freezing operation control according to the anti-freezing operation mode; wherein the anti-freeze operation mode includes: a water-free anti-freezing operation mode, a water-shortage anti-freezing operation mode or a water-existence anti-freezing operation mode.

2. the method of claim 1, the determining an antifreeze mode of operation based on the water flow rate value comprising:

Judging whether the water flow value is greater than or equal to a preset flow threshold value or not;

If so, determining that the anti-freezing operation mode is the water-containing anti-freezing operation mode;

If not, judging whether the water flow value is 0, if so, determining that the anti-freezing operation mode is the waterless anti-freezing operation mode, and if not, determining that the anti-freezing operation mode is the water-shortage anti-freezing operation mode.

3. The method of claim 2, further comprising:

And when the compressor is not in a working state, judging whether the control parameters meet the antifreezing detection entering condition, and if so, entering the antifreezing detection stage.

4. The method of claim 3, wherein,

The control parameters include: ambient temperature, water inlet temperature and water outlet temperature; the freeze protection detection entry condition includes: the ambient temperature is less than or equal to T0, the influent temperature is less than or equal to T0 +. DELTA.t, or the effluent temperature is less than or equal to T0 +. DELTA.t;

wherein, T0 is a first temperature threshold value, and Δ T is a temperature setting deviation.

5. The method of claim 4, wherein detecting the flow rate of water for the freeze protection operation comprises:

And starting the water pump to operate and detecting a water flow switch so as to detect the water flow value.

6. The method of claim 5, further comprising:

If the water flow value is 0, controlling the water pump to stop and setting a first water flow switch to have a fault;

Entering a first cycle anti-freezing detection stage, and periodically controlling the water pump to start and stop; if the control parameter is judged to meet the anti-freezing detection entering condition during the shutdown of the water pump, clearing the fault of the first water flow switch, starting the water pump to operate and carrying out the water flow switch detection, and if the water flow value is 0, controlling the water pump to be shut down and setting the fault of the first water flow switch;

and if the starting times of the water pump reach a preset first operation time threshold value, controlling the water pump to operate, and performing first anti-freezing operation control according to the waterless anti-freezing operation mode.

7. The method as set forth in claim 6, the performing the first antifreeze operation control according to the non-water antifreeze operation mode comprising:

shielding the water flow switch for detection, and entering a heating mode after the water pump runs for a preset first running time; wherein the first device operating in the heating mode comprises: a compressor;

And exiting the first anti-freezing operation control based on a preset first anti-freezing operation exit condition.

8. the method of claim 7, the exiting the first freeze protection operation control based on a preset first freeze protection operation exit condition comprising:

If the high-voltage protection condition is met, setting a high-voltage protection fault and controlling the compressor to stop;

the compressor is periodically controlled to start and stop; when the shutdown time of the compressor reaches a preset first shutdown time length, clearing the high-pressure protection fault, controlling the compressor to start, and if the high-pressure protection condition is met, setting the high-pressure protection fault and controlling the compressor to shutdown;

and under the condition that the starting times of the compressor reach a preset first starting time threshold, if the high-pressure protection condition is met, controlling the compressor and the water pump to stop, and setting and locking the high-pressure protection fault.

9. The method of claim 8, the first device further comprising: a fan; the method further comprises the following steps:

and under the condition that the starting times of the compressor reach a preset first starting time threshold, after the compressor and the water pump are stopped, controlling the fan to stop after a preset delay operation time period, and setting and locking the high-voltage protection fault.

10. The method of claim 5, further comprising:

if the water flow value is judged to be larger than 0 and smaller than the flow threshold value, controlling the water pump to stop and setting a second water flow switch to have a fault;

entering a second cycle anti-freezing detection stage, and periodically controlling the water pump to start and stop; if the control parameter is judged to meet the anti-freezing detection entering condition during the shutdown of the water pump, clearing the second flow switch fault, starting the water pump to operate and carrying out the flow switch detection, and if the flow value of the water flow is larger than 0 and smaller than the flow threshold value, controlling the water pump to shutdown and setting the second flow switch fault;

And if the starting times of the water pump reach a preset second operation time threshold value, controlling the water pump to operate, and performing second anti-freezing operation control according to the water-shortage anti-freezing operation mode.

11. the method as set forth in claim 10, the performing of the second freeze protection operation control according to the water-deficient freeze protection operation mode comprising:

Shielding the water flow switch for detection, and entering a heating mode after the water pump runs for a preset second running time; wherein the second device operating in the heating mode comprises: a compressor;

And exiting the second anti-freezing operation control based on a preset second anti-freezing operation exit condition.

12. The method of claim 11, the exiting the second freeze protection operation control based on a preset second freeze protection operation exit condition comprising:

If the overheat protection condition is judged to be met, setting an overheat protection fault and controlling the compressor to stop;

The compressor is periodically controlled to start and stop; when the shutdown time of the compressor reaches a preset second shutdown time, clearing the overheating protection fault, controlling the compressor to start, and if the overheating protection condition is met, setting the overheating protection fault and controlling the compressor to shutdown;

and under the condition that the starting times of the compressor reach a preset second starting time threshold, if the overheat protection condition is met, controlling the compressor and the water pump to stop.

13. The method of claim 5, further comprising:

if the water flow value is larger than or equal to the flow threshold value, entering a third cycle anti-freezing detection stage, and periodically controlling the water pump to start and stop until the control parameters meet the anti-freezing operation conditions of the heat pump after the compressor is not in the working state; performing third freeze prevention operation control according to the water-containing freeze prevention operation mode;

if the control parameter meets the anti-freezing detection entry condition, the water pump is periodically controlled to be started; after the water pump is started, if the difference between the outlet water temperature and the inlet water temperature is smaller than or equal to a preset temperature difference threshold value, the water pump is controlled to be stopped and restarted after a preset third stop time period.

14. The method of claim 13, further comprising:

determining a starting minimum starting operation period of the water pump based on preset circulating water storage capacity and the highest gear operation water flow of the water pump;

And in a third period anti-freezing detection stage, setting the periodic operation time length of the water pump to be more than or equal to the starting minimum starting operation period, and setting the third stop time length as a preset stop interval period of the water pump.

15. The method of claim 14, further comprising:

The anti-freezing operation conditions of the heat pump comprise: the ambient temperature is less than or equal to T1, the influent temperature is less than or equal to T1+ the Δ T, or the effluent temperature is less than or equal to T1+ the Δ T;

wherein the T1 is a second temperature threshold, and T1 < T0.

16. The method as set forth in claim 15, the performing the third freeze operation control according to the water anti-freeze operation mode including:

If the inlet water temperature or the outlet water temperature is determined to be less than or equal to T1+ the first set value, entering a heat pump operation anti-freezing stage, and controlling the water pump to start to operate at a high gear;

if the inlet water temperature or the outlet water temperature is determined to be less than or equal to T1-a second set value, entering a heat pump operation anti-freezing stage, starting a heating mode and controlling a third device to operate; wherein the third device comprises: the water pump and the compressor;

And judging that the water inlet temperature or the water outlet temperature is less than the anti-freezing exit temperature threshold, if not, exiting the anti-freezing stage of the heat pump operation, and controlling the third equipment to shut down.

17. an antifreeze control apparatus comprising:

the parameter detection module is used for detecting control parameters and judging whether to enter an anti-freezing detection stage according to the control parameters;

the water quantity detection module is used for entering an anti-freezing detection stage and detecting a water flow value for anti-freezing operation if the water quantity detection module is used for entering the anti-freezing detection stage;

the anti-freezing control module is used for determining an anti-freezing operation mode based on the water flow value and correspondingly controlling anti-freezing operation according to the anti-freezing operation mode; wherein the anti-freeze operation mode includes: a water-free anti-freezing operation mode, a water-shortage anti-freezing operation mode or a water-existence anti-freezing operation mode.

18. an antifreeze control apparatus, comprising: a memory; and a processor coupled to the memory, the processor configured to perform operations to implement the anti-freeze control method of any of claims 1-16 based on instructions stored in the memory.

19. A heat pump water system comprising the antifreeze control apparatus of claim 17 or 18.

20. A computer-readable storage medium storing computer instructions which, when executed by a processor, implement the antifreeze control method of any of claims 1-16.