CN113091236B - Air conditioner liquid impact protection method and device and air conditioner - Google Patents
Air conditioner liquid impact protection method and device and air conditioner Download PDFInfo
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- CN113091236B CN113091236B CN202010849663.6A CN202010849663A CN113091236B CN 113091236 B CN113091236 B CN 113091236B CN 202010849663 A CN202010849663 A CN 202010849663A CN 113091236 B CN113091236 B CN 113091236B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
Abstract
The invention relates to a liquid impact protection method and device for an air conditioner and the air conditioner, wherein the method comprises the steps of continuously detecting the intermediate pressure saturation temperature of the inlet of a heat exchanger, the temperature of an air supplement port of a compressor and the temperature of the outlet of a condenser within a first set time, and judging whether the intermediate pressure saturation temperature of the inlet of the heat exchanger, the temperature of the air supplement port of the compressor and the temperature of the outlet of the condenser meet a first set condition; when the heat exchanger inlet medium pressure saturation temperature, the compressor air supplementing port temperature and the condenser outlet temperature meet the first set condition, the air conditioner is judged to have liquid impact risk, the air supplementing enthalpy increasing loop is closed, the damage of the compressor caused by liquid impact is avoided, and the safe operation of the air conditioner is ensured.
Description
Technical Field
The invention relates to an air conditioner technology, in particular to an air conditioner liquid impact protection method and device and an air conditioner.
Background
The compressor liquid impact means that liquid refrigerant or lubricating oil is sucked into the compressor, so that the liquid impact accident of the compressor is caused.
The existing air conditioner usually avoids the migration of a refrigerant to a compressor by controlling the opening degree of a throttling device or adopting a gas-liquid separation device, but the liquid impact risk is still high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a liquid impact protection method and device for an air conditioner and the air conditioner, which can effectively reduce the risk of liquid impact. The technical scheme is as follows:
in a first aspect, an embodiment of the present application provides a liquid impact protection method for an air conditioner, which is applied to an air conditioner with an air-supply enthalpy-increasing loop, and includes the following steps:
opening the air-replenishing enthalpy-increasing loop;
continuously detecting the intermediate pressure saturation temperature of the inlet of a heat exchanger, the temperature of an air supplement port of a compressor and the temperature of the outlet of a condenser within a first set time, and judging whether the intermediate pressure saturation temperature of the inlet of the heat exchanger, the temperature of the air supplement port of the compressor and the temperature of the outlet of the condenser meet a first set condition;
the first set condition is that the temperature of the air supplement port of the compressor is greater than or equal to a first threshold value, the difference value between the outlet temperature of the condenser and the medium pressure saturation temperature at the inlet of the heat exchanger is smaller than a second threshold value, and the difference value between the temperature of the air supplement port of the compressor and the medium pressure saturation temperature at the inlet of the heat exchanger is smaller than a third threshold value;
and if the intermediate pressure saturation temperature of the heat exchanger inlet, the temperature of the air supplementing port of the compressor and the temperature of the outlet of the condenser meet the first set condition, closing the air supplementing enthalpy increasing loop.
Optionally, after determining whether the heat exchanger inlet medium-pressure saturation temperature, the compressor air supplement port temperature, and the condenser outlet temperature satisfy a first set condition, the method further includes:
and if the intermediate pressure saturation temperature of the inlet of the heat exchanger, the temperature of the air supplementing port of the compressor and the temperature of the outlet of the condenser do not meet the first set condition, keeping the air supplementing enthalpy increasing loop open.
Optionally, before the step of determining whether the heat exchanger inlet medium pressure saturation temperature, the compressor air supplement port temperature, and the condenser outlet temperature satisfy a first set condition, the method further includes:
if the difference value between the temperature of the air supplement port of the compressor and the medium pressure saturation temperature at the inlet of the heat exchanger is smaller than a third threshold value, after a second set time, the opening degree of an expansion valve is increased;
the expansion valve is arranged between the heat exchanger and the condenser, and the second set time is less than the first set time.
Optionally, the step of increasing the opening degree of the expansion valve includes:
acquiring an opening value of a current expansion valve as a first opening value;
acquiring a first sequence number of the first opening value in a preset opening value table; the preset opening value table stores a plurality of opening values which are sorted from small to large, and each opening value corresponds to a sequence number;
adding the first sequence number and a preset adjustment value to obtain a second sequence number; wherein the preset adjustment value is a natural number greater than 0;
acquiring a second opening value corresponding to the second sequence number from a preset opening value table;
adjusting the opening degree of the expansion valve to the second opening degree value.
Optionally, the step of detecting the intermediate-pressure saturation temperature at the inlet of the heat exchanger includes:
acquiring the pressure of the inlet of the heat exchanger;
and acquiring the medium-pressure saturation temperature at the inlet of the heat exchanger corresponding to the pressure at the inlet of the heat exchanger according to a preset saturation temperature and pressure comparison table.
Optionally, the heat exchanger is an economizer.
Optionally, the economizer is any one of a flash vessel and a high-efficiency tank.
In a second aspect, an embodiment of the present application provides an air conditioner liquid impact protection device, which is applied to an air conditioner with an air-supplying enthalpy-increasing loop, and includes:
the starting module is used for starting the air-supplementing enthalpy-increasing loop;
the judging module is used for continuously detecting the intermediate pressure saturation temperature of the inlet of the heat exchanger, the temperature of the air supplement port of the compressor and the temperature of the outlet of the condenser within a first set time, and judging whether the intermediate pressure saturation temperature of the inlet of the heat exchanger, the temperature of the air supplement port of the compressor and the temperature of the outlet of the condenser meet a first set condition;
the first set condition is that the temperature of the air supplement port of the compressor is greater than or equal to a first threshold value, the difference value between the outlet temperature of the condenser and the medium pressure saturation temperature at the inlet of the heat exchanger is smaller than a second threshold value, and the difference value between the temperature of the air supplement port of the compressor and the medium pressure saturation temperature at the inlet of the heat exchanger is smaller than a third threshold value;
and the closing module is used for closing the air supplementing enthalpy increasing loop if the intermediate pressure saturation temperature of the heat exchanger inlet, the temperature of the air supplementing port of the compressor and the temperature of the outlet of the condenser meet the first set condition.
In a third aspect, an embodiment of the present application provides an air conditioner, including: the system comprises a compressor, an evaporator, a condenser, a heat exchanger, an expansion valve and a controller;
the heat exchanger comprises a first interface, a second interface and a third interface, the first interface of the heat exchanger is connected with an input port of the evaporator, the second interface of the heat exchanger is connected with an output port of the condenser through the expansion valve, and the third interface of the heat exchanger is connected with an air supplement port of the compressor;
the controller comprises a memory and a processor;
the memory for storing one or more programs;
when the one or more programs are executed by the processor, the processor is enabled to realize the air conditioner liquid impact protection method according to any one of claims 1-5.
Optionally, the heat exchanger is an economizer.
Optionally, the economizer is any one of a flash vessel and a high-efficiency tank.
Optionally, the air conditioner further includes a first temperature detection device, a second temperature detection device, and a pressure detection device;
the first temperature detection device is arranged at the air supplement port of the compressor and is used for detecting the temperature of the air supplement port of the compressor;
the second temperature detection device is arranged at the output port of the condenser and is used for detecting the outlet temperature of the condenser;
the pressure detection device is arranged at a second interface of the heat exchanger and used for detecting the pressure at the inlet of the heat exchanger.
Optionally, the air conditioner further comprises a control switch;
the control switch is arranged between the third interface of the heat exchanger and the air supplementing port of the compressor and used for controlling the opening and closing of the air supplementing enthalpy increasing loop.
In the embodiment of the application, the medium-pressure saturation temperature at the inlet of a heat exchanger, the temperature of a gas supplementing port of a compressor and the temperature of the outlet of a condenser are continuously detected within a first set time, and whether the medium-pressure saturation temperature at the inlet of the heat exchanger, the temperature of the gas supplementing port of the compressor and the temperature of the outlet of the condenser meet a first set condition is judged; when the heat exchanger inlet medium pressure saturation temperature, the compressor air supplementing port temperature and the condenser outlet temperature meet the first set condition, the air conditioner is judged to have liquid impact risk, the air supplementing enthalpy increasing loop is closed, the damage of the compressor caused by liquid impact is avoided, and the safe operation of the air conditioner is ensured.
For a better understanding and practice, the invention is described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is an application scenario of the liquid impact protection method for the air conditioner in an exemplary embodiment of the present invention;
fig. 2 is a flowchart of an air conditioner control method according to an exemplary embodiment of the present invention;
fig. 3 is a schematic structural view of an air conditioner control device according to an exemplary embodiment of the present invention;
fig. 4 is a schematic structural view of an air conditioner according to an exemplary embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
It should be understood that the embodiments described are only some embodiments of the present application, and not all embodiments. All other examples, which can be obtained by a person skilled in the art without making any inventive step based on the embodiments in the present application, belong to the scope of protection of the embodiments in the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims. In the description of the present application, it is to be understood that the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not necessarily used to describe a particular order or sequence, nor are they to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The air conditioner liquid impact protection method can be applied to the air conditioner shown in the figure 1, so that damage to a compressor caused by liquid impact is avoided, and safe operation of the air conditioner is guaranteed. The air conditioner comprises a compressor 10, a condenser 20, a first expansion valve 30, a heat exchanger 40, a second expansion valve 50, an evaporator 60 and a control switch 70, wherein the first expansion valve 30 is used for controlling the amount of refrigerant entering the heat exchanger 40, and when the control switch 70 is turned on, gaseous refrigerant in the heat exchanger 40 is output to an air supplement port of the compressor 10 to supplement medium-pressure gas for the compressor 10, so that the exhaust temperature of the compressor 10 is reduced, and the heat exchange capacity of the compressor 10 is improved.
As shown in fig. 2, an embodiment of the present application provides a method for protecting an air conditioner from liquid impact, including the following steps:
step S1: opening the air-replenishing enthalpy-increasing loop;
the opening and closing of the air-supply enthalpy-increasing loop can be controlled by a control switch arranged between the air-supply enthalpy-increasing loop and the air-supply port of the compressor. The control switch is turned on or turned off according to a control command sent by a main controller of the air conditioner, so that the air-supplying enthalpy-increasing loop is controlled to be turned on or turned off.
The control switch may be a commonly used control element of an air conditioning system, such as a two-way valve or an electronic expansion valve.
Step S2: continuously detecting the intermediate pressure saturation temperature of the inlet of a heat exchanger, the temperature of an air supplement port of a compressor and the temperature of the outlet of a condenser within a first set time, and judging whether the intermediate pressure saturation temperature of the inlet of the heat exchanger, the temperature of the air supplement port of the compressor and the temperature of the outlet of the condenser meet a first set condition;
when the vapor-supplementing enthalpy-increasing loop is opened, the condenser overload or the exhaust temperature is too high to trigger high-pressure protection, so that the opening degree of an expansion valve between the condenser and the heat exchanger is increased, and an intermediate-pressure liquid refrigerant enters the compressor through the vapor-supplementing enthalpy-increasing loop to cause liquid impact damage to the compressor.
The first set condition is used for judging whether the air conditioner compressor has liquid impact risk or not, when the temperature of an air supplementing port of the compressor is higher and the intermediate pressure is higher, the dryness of a refrigerant of the enthalpy increasing loop is reduced, and the enthalpy increasing quantity of the air supplementing enthalpy loop is increased; when the opening degree of an expansion valve between the condenser and the heat exchanger is increased, the medium-pressure saturation temperature at the inlet of the heat exchanger approaches to the outlet temperature of the condenser, and when the supercooling degree of the condenser is increased and the medium-pressure saturation temperature at the inlet of the heat exchanger is reduced, the liquid impact risk is high.
Specifically, the first set condition is that the temperature of the air supplement port of the compressor is greater than or equal to a first threshold value, the difference between the outlet temperature of the condenser and the intermediate pressure saturation temperature at the inlet of the heat exchanger is smaller than a second threshold value, and the difference between the temperature of the air supplement port of the compressor and the intermediate pressure saturation temperature at the inlet of the heat exchanger is smaller than a third threshold value.
And the medium-pressure saturation temperature at the inlet of the heat exchanger is the temperature of liquid and gaseous refrigerants in the heat exchanger in a dynamic balance state. In one example, the step of detecting the saturation temperature of the medium pressure at the inlet of the heat exchanger comprises:
acquiring the pressure of the inlet of the heat exchanger;
and acquiring the medium-pressure saturation temperature at the inlet of the heat exchanger corresponding to the pressure at the inlet of the heat exchanger according to a preset saturation temperature and pressure comparison table.
Step S3: and if the intermediate pressure saturation temperature of the heat exchanger inlet, the temperature of the air supplementing port of the compressor and the temperature of the outlet of the condenser meet the first set condition, closing the air supplementing enthalpy increasing loop.
In the embodiment of the application, the medium-pressure saturation temperature at the inlet of a heat exchanger, the temperature of a gas supplementing port of a compressor and the temperature of the outlet of a condenser are continuously detected within a first set time, and whether the medium-pressure saturation temperature at the inlet of the heat exchanger, the temperature of the gas supplementing port of the compressor and the temperature of the outlet of the condenser meet a first set condition is judged; when the heat exchanger inlet medium pressure saturation temperature, the compressor air supplementing port temperature and the condenser outlet temperature meet the first set condition, the air conditioner is judged to have liquid impact risk, the air supplementing enthalpy increasing loop is closed, the damage of the compressor caused by liquid impact is avoided, and the safe operation of the air conditioner is ensured.
In an exemplary embodiment, after determining whether the heat exchanger inlet medium pressure saturation temperature, the compressor make-up air port temperature and the condenser outlet temperature satisfy a first set condition, the method further includes:
and if the intermediate pressure saturation temperature of the inlet of the heat exchanger, the temperature of the air supplementing port of the compressor and the temperature of the outlet of the condenser do not meet the first set condition, keeping the air supplementing enthalpy increasing loop open.
When one of the heat exchanger inlet medium pressure saturation temperature, the compressor air supplementing port temperature and the condenser outlet temperature does not meet a first set condition, the heat exchanger inlet medium pressure saturation temperature, the compressor air supplementing port temperature and the condenser outlet temperature are judged not to meet the first set condition, and at the moment, the air supplementing and enthalpy increasing loop keeps an open state.
And for the condition that the first set condition is not met, the air conditioner does not act, and the air-supplying enthalpy-increasing loop keeps an open state so as to ensure the smooth operation of the system.
In an exemplary embodiment, when the difference between the temperature of the air supplement port of the compressor and the intermediate pressure saturation temperature at the inlet of the heat exchanger is smaller than a third threshold value, the air conditioner is judged to have a liquid impact risk, at this time, the opening degree of an expansion valve between a condenser and a flash evaporator is properly increased to avoid the liquid impact risk of the air conditioner, and then the adjusted intermediate pressure saturation temperature at the inlet of the heat exchanger, the temperature of the air supplement port of the compressor and the temperature of the outlet of the condenser are detected and whether an air supplement enthalpy increasing loop needs to be closed or not is judged to ensure the stable operation of the air conditioner.
Therefore, before the step of determining whether the heat exchanger inlet medium pressure saturation temperature, the compressor air supplement port temperature and the condenser outlet temperature satisfy the first set condition, the method further comprises the following steps:
if the difference value between the temperature of the air supplement port of the compressor and the medium pressure saturation temperature at the inlet of the heat exchanger is smaller than a third threshold value, after a second set time, the opening degree of an expansion valve is increased;
the expansion valve is arranged between the flash evaporator and the condenser, and the amount of the refrigerant output to the flash evaporator by the condenser can be controlled by adjusting the opening degree of the expansion valve.
And the second set time is less than the first set time, and the liquid impact risk of the air conditioner is reduced by increasing the opening degree of an expansion valve between the condenser and the flash evaporator within the second set time.
Specifically, the step of increasing the opening degree of the expansion valve includes:
acquiring an opening value of a current expansion valve as a first opening value;
acquiring a first sequence number of the first opening value in a preset opening value table; the preset opening value table stores a plurality of opening values which are sorted from small to large, and each opening value corresponds to a sequence number;
adding the first sequence number and a preset adjustment value to obtain a second sequence number;
acquiring a second opening value corresponding to the second sequence number from a preset opening value table;
adjusting the opening degree of the expansion valve to the second opening degree value.
The preset adjusting value is a natural number larger than 0, and can be adjusted according to the actual running condition of the air conditioner.
In one example, the preset adjustment value is 4, when the difference between the temperature of the air supplement port of the compressor and the intermediate pressure saturation temperature at the inlet of the heat exchanger is smaller than a third threshold value, the liquid impact risk is judged to exist, after a second set time, the opening degree of the expansion valve is increased by 4 opening degrees, whether the difference between the temperature of the air supplement port of the compressor and the intermediate pressure saturation temperature at the inlet of the heat exchanger is still smaller than the third threshold value or not is continuously detected, if yes, the liquid impact risk of the system is judged to be large, and the air supplement enthalpy increasing loop is closed.
In the embodiment of the application, aiming at the condition that the difference value between the temperature of the air supplement port of the compressor and the medium-pressure saturation temperature at the inlet of the heat exchanger is smaller than the third threshold value, the opening degree of the expansion valve is adjusted, and the adjusted temperature of the air supplement port of the compressor and the medium-pressure saturation temperature at the inlet of the heat exchanger are further detected, so that the switching frequency of the air supplement enthalpy increasing loop is reduced, and the stability of the air conditioner and the accuracy of liquid attack risk judgment are improved.
As shown in fig. 3, an embodiment of the present application further provides a liquid impact protection device for an air conditioner, which is applied to an air conditioner with an air-supplying enthalpy-increasing loop, and includes:
the starting module 1 is used for starting the air-supplementing enthalpy-increasing loop;
the judging module 2 is used for continuously detecting the intermediate pressure saturation temperature of the inlet of the heat exchanger, the temperature of the air supplement port of the compressor and the temperature of the outlet of the condenser within a first set time, and judging whether the intermediate pressure saturation temperature of the inlet of the heat exchanger, the temperature of the air supplement port of the compressor and the temperature of the outlet of the condenser meet a first set condition;
the first set condition is that the temperature of the air supplement port of the compressor is more than or equal to a first threshold value, the difference value between the outlet temperature of the condenser and the medium pressure saturation temperature at the inlet of the heat exchanger is less than a second threshold value, and the difference value between the temperature of the air supplement port of the compressor and the medium pressure saturation temperature at the inlet of the heat exchanger is less than a third threshold value
And the closing module 3 is used for closing the air supplementing enthalpy increasing loop if the intermediate pressure saturation temperature of the heat exchanger inlet, the temperature of the air supplementing port of the compressor and the temperature of the outlet of the condenser meet the first set condition.
It should be noted that, when the air conditioner liquid impact protection device provided in the foregoing embodiment executes the air conditioner liquid impact protection method, only the division of the above functional modules is taken as an example, and in practical applications, the above functions may be distributed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules, so as to complete all or part of the above described functions. In addition, the air conditioner liquid impact protection device and the air conditioner liquid impact protection method provided by the embodiment belong to the same concept, and the detailed implementation process is shown in the method embodiment and is not described herein again.
As shown in fig. 4, an embodiment of the present application further provides an air conditioner, including: a compressor 100, an evaporator 200, a first expansion valve 300, a heat exchanger 400, a second expansion valve 500, a condenser 600, and a controller 800;
the first interface 101 of the compressor is connected with the output port of the evaporator 200, and the second interface 102 of the compressor is connected with the input port of the condenser 600;
the heat exchanger 400 comprises a first interface 401, a second interface 402 and a third interface 403, the first interface of the heat exchanger is connected with the input port of the evaporator 200 through the first expansion valve 300, the second interface 402 of the heat exchanger is connected with the output port of the condenser 600 through the second expansion valve 400, and the third interface 403 of the heat exchanger is connected with the gas supplementing port 103 of the compressor;
the controller 800 includes a memory 801 and a processor 802;
the memory 801 is used for storing one or more programs;
when the one or more programs are executed by the processor 802, the processor 802 may implement the method for protecting liquid impact of an air conditioner as described in any one of the above.
The heat exchanger 400 may be a flash evaporator, an efficient tank, an economizer, or other heat exchange devices with the functions required by the embodiments of the present application.
In one example, the air conditioner further includes a control switch 700; the control switch 700 is arranged between the third interface 403 of the heat exchanger and the air supplement port 103 of the compressor, and is used for controlling the opening and closing of the air supplement enthalpy increasing loop.
In one example, the air conditioner further comprises a first temperature detection device, a second temperature detection device and a pressure detection device;
the first temperature detection device is arranged at the compressor air supplement port 103 and is used for detecting the temperature of the compressor air supplement port;
the second temperature detection device is arranged at the output port of the condenser 600 and is used for detecting the outlet temperature of the condenser;
the pressure detection device is arranged at the second interface 402 of the heat exchanger and is used for detecting the pressure at the inlet of the heat exchanger.
According to the method and the device for protecting the air conditioner from liquid impact and the air conditioner, whether the heat exchanger inlet intermediate pressure saturation temperature, the compressor air supplement port temperature and the condenser outlet temperature meet a first set condition or not is judged by continuously detecting the heat exchanger inlet intermediate pressure saturation temperature, the compressor air supplement port temperature and the condenser outlet temperature within a first set time; when the heat exchanger inlet medium pressure saturation temperature, the compressor air supplementing port temperature and the condenser outlet temperature meet the first set condition, the air conditioner is judged to have liquid impact risk, the air supplementing enthalpy increasing loop is closed, the damage of the compressor caused by liquid impact is avoided, and the safe operation of the air conditioner is ensured. And aiming at the condition that the difference value between the temperature of the air supplement port of the compressor and the medium-pressure saturation temperature at the inlet of the heat exchanger is smaller than a third threshold value, judging that the air conditioner possibly has a large liquid impact risk, avoiding the liquid impact risk of the air conditioner by properly increasing the opening degree of an expansion valve between the condenser and the flash evaporator, detecting the adjusted medium-pressure saturation temperature at the inlet of the heat exchanger, the temperature of the air supplement port of the compressor and the temperature of the outlet of the condenser, and judging whether an air supplement enthalpy increasing loop needs to be closed or not so as to ensure the stable operation of the air conditioner.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.
Claims (13)
1. A liquid impact protection method of an air conditioner is characterized by comprising the following steps: the air conditioner with the air-supplying enthalpy-increasing loop comprises the following steps:
opening the air-replenishing enthalpy-increasing loop;
continuously detecting the intermediate pressure saturation temperature of the inlet of a heat exchanger, the temperature of an air supplement port of a compressor and the temperature of the outlet of a condenser within a first set time, and judging whether the intermediate pressure saturation temperature of the inlet of the heat exchanger, the temperature of the air supplement port of the compressor and the temperature of the outlet of the condenser meet a first set condition;
the first set condition is that the temperature of the air supplement port of the compressor is greater than or equal to a first threshold value, the difference value between the outlet temperature of the condenser and the medium pressure saturation temperature at the inlet of the heat exchanger is smaller than a second threshold value, and the difference value between the temperature of the air supplement port of the compressor and the medium pressure saturation temperature at the inlet of the heat exchanger is smaller than a third threshold value;
and if the intermediate pressure saturation temperature of the heat exchanger inlet, the temperature of the air supplementing port of the compressor and the temperature of the outlet of the condenser meet the first set condition, closing the air supplementing enthalpy increasing loop.
2. The air conditioner liquid impact protection method according to claim 1, characterized in that: after judging whether the heat exchanger inlet medium pressure saturation temperature, the compressor air supplement port temperature and the condenser outlet temperature meet a first set condition, the method further comprises the following steps:
and if the intermediate pressure saturation temperature of the inlet of the heat exchanger, the temperature of the air supplementing port of the compressor and the temperature of the outlet of the condenser do not meet the first set condition, keeping the air supplementing enthalpy increasing loop open.
3. The air conditioner liquid impact protection method according to claim 1, characterized in that: before the step of judging whether the heat exchanger inlet medium pressure saturation temperature, the compressor air supplement port temperature and the condenser outlet temperature meet a first set condition, the method further comprises the following steps:
if the difference value between the temperature of the air supplement port of the compressor and the medium pressure saturation temperature at the inlet of the heat exchanger is smaller than a third threshold value, after a second set time, the opening degree of an expansion valve is increased;
the expansion valve is arranged between the heat exchanger and the condenser, and the second set time is less than the first set time.
4. The air conditioner liquid impact protection method according to claim 3, characterized in that: the step of increasing the opening degree of the expansion valve includes:
acquiring an opening value of a current expansion valve as a first opening value;
acquiring a first sequence number of the first opening value in a preset opening value table; the preset opening value table stores a plurality of opening values which are sorted from small to large, and each opening value corresponds to a sequence number;
adding the first sequence number and a preset adjustment value to obtain a second sequence number; wherein the preset adjustment value is a natural number greater than 0;
acquiring a second opening value corresponding to the second sequence number from a preset opening value table;
adjusting the opening degree of the expansion valve to the second opening degree value.
5. The air conditioner liquid impact protection method according to claim 1, characterized in that: the step of detecting the medium pressure saturation temperature at the inlet of the heat exchanger comprises the following steps:
acquiring the pressure of the inlet of the heat exchanger;
and acquiring the medium-pressure saturation temperature at the inlet of the heat exchanger corresponding to the pressure at the inlet of the heat exchanger according to a preset saturation temperature and pressure comparison table.
6. The air conditioner liquid impact protection method according to claim 1, characterized in that: the heat exchanger is an economizer.
7. The air conditioner liquid impact protection method according to claim 6, characterized in that: the economizer is any one of a flash evaporator and a high-efficiency tank.
8. The utility model provides an air conditioner liquid hits protection device which characterized in that is applied to the air conditioner that is equipped with tonifying qi and increases the enthalpy return circuit, includes:
the starting module is used for starting the air-supplementing enthalpy-increasing loop;
the judging module is used for continuously detecting the intermediate pressure saturation temperature of the inlet of the heat exchanger, the temperature of the air supplement port of the compressor and the temperature of the outlet of the condenser within a first set time, and judging whether the intermediate pressure saturation temperature of the inlet of the heat exchanger, the temperature of the air supplement port of the compressor and the temperature of the outlet of the condenser meet a first set condition;
the first set condition is that the temperature of the air supplement port of the compressor is greater than or equal to a first threshold value, the difference value between the outlet temperature of the condenser and the medium pressure saturation temperature at the inlet of the heat exchanger is smaller than a second threshold value, and the difference value between the temperature of the air supplement port of the compressor and the medium pressure saturation temperature at the inlet of the heat exchanger is smaller than a third threshold value;
and the closing module is used for closing the air supplementing enthalpy increasing loop if the intermediate pressure saturation temperature of the heat exchanger inlet, the temperature of the air supplementing port of the compressor and the temperature of the outlet of the condenser meet the first set condition.
9. An air conditioner, comprising: the system comprises a compressor, an evaporator, a condenser, a heat exchanger, an expansion valve and a controller;
the heat exchanger comprises a first interface, a second interface and a third interface, the first interface of the heat exchanger is connected with an input port of the evaporator, the second interface of the heat exchanger is connected with an output port of the condenser through the expansion valve, and the third interface of the heat exchanger is connected with an air supplement port of the compressor;
the controller comprises a memory and a processor;
the memory for storing one or more programs;
when the one or more programs are executed by the processor, the processor is enabled to implement the air conditioner liquid impact protection method according to any one of claims 1 to 7.
10. The air conditioner according to claim 9, wherein: the heat exchanger is an economizer.
11. The air conditioner according to claim 10, wherein: the economizer is any one of a flash evaporator and a high-efficiency tank.
12. The air conditioner according to claim 9, wherein: the air conditioner also comprises a first temperature detection device, a second temperature detection device and a pressure detection device;
the first temperature detection device is arranged at the air supplement port of the compressor and is used for detecting the temperature of the air supplement port of the compressor;
the second temperature detection device is arranged at the output port of the condenser and is used for detecting the outlet temperature of the condenser;
the pressure detection device is arranged at a second interface of the heat exchanger and used for detecting the pressure at the inlet of the heat exchanger.
13. The air conditioner according to claim 9, wherein: the air conditioner also comprises a control switch;
the control switch is arranged between the third interface of the heat exchanger and the air supplementing port of the compressor and used for controlling the opening and closing of the air supplementing enthalpy increasing loop.
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