CN110822760A - Air conditioner refrigerant system, refrigerant leakage detection method and air conditioner - Google Patents

Air conditioner refrigerant system, refrigerant leakage detection method and air conditioner Download PDF

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CN110822760A
CN110822760A CN201810924059.8A CN201810924059A CN110822760A CN 110822760 A CN110822760 A CN 110822760A CN 201810924059 A CN201810924059 A CN 201810924059A CN 110822760 A CN110822760 A CN 110822760A
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refrigerant
air
air conditioner
value
pressure
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CN110822760B (en
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白韡
许真鑫
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Aux Air Conditioning Co Ltd
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Aux Air Conditioning Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Signal Processing (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an air-conditioning refrigerant system, which comprises an evaporator, a condenser, a four-way valve, a gas-liquid separator and a compressor, wherein a first flowmeter and a second flowmeter are respectively arranged at an air suction port and an air outlet of the compressor, an outdoor temperature sensor is arranged on the condenser, and an air outlet temperature sensor and an air return temperature sensor are arranged on the evaporator; the refrigerant pipeline is composed of a central pipe and an outer sleeve, a hollow cavity is arranged between the central pipe and the outer sleeve, and pressure sensors are arranged on the inner walls of the central pipe and the outer sleeve. The invention has the beneficial effects that: (1) the air conditioner has higher judgment accuracy on refrigerant leakage; (2) and the positioning of a leakage point on the air-conditioning pipeline is realized.

Description

Air conditioner refrigerant system, refrigerant leakage detection method and air conditioner
Technical Field
The invention relates to the field of air conditioners, in particular to an air conditioner refrigerant system, a refrigerant leakage detection method and an air conditioner.
Background
With the improvement of the living standard of people, the popularization rate of air conditioners is higher and higher, and in the face of large-area popularization of the air conditioners, the maintenance of the air conditioners is correspondingly frequent, various air conditioner problems in the market are endless, and a reasonable solution cannot be found for the refrigerant leakage problem of the air conditioners all the time, various leakage problems in the market at present, such as welding leakage of an internal machine evaporator, leakage of a connecting pipe, leakage of an external machine condenser, leakage caused by pipeline breakage of a four-way valve, and the like, once leakage occurs, a user can usually find the maintenance when the refrigerating and heating effects of the air conditioners become extremely poor. To the refrigerant condition of leaking, adopt in the prior art mostly more rationally and exquisite modes such as preventing leaking pipeline valve interface of design structure to place the refrigerant and leak, in practice, these prevent leaking valve and interface and have reduced the possibility that the leakage takes place to a great extent really. The leakage detection method suitable for the method is not improved, namely the leakage detection is not carried out by using a method of carrying out one-time judgment on a single air conditioner parameter, but the judgment is carried out by comprehensively using the parameters of various air conditioner systems, so that the phenomenon that the air conditioner is repeatedly protected and shut down due to misjudgment of air conditioner refrigerant leakage is avoided.
Disclosure of Invention
The invention aims to provide an air conditioner refrigerant system, a refrigerant leakage detection method and an air conditioner, so that the accuracy of judgment of refrigerant leakage by the air conditioner is higher.
Specifically, the invention is realized by the following technical scheme:
an air-conditioning refrigerant system comprises an evaporator positioned at the indoor side, a condenser positioned at the outdoor side, a four-way valve, a gas-liquid separator and a compressor, wherein a first flowmeter and a second flowmeter are respectively arranged at an air suction port and an air outlet of the compressor, an outdoor temperature sensor is arranged on the condenser, and an air outlet temperature sensor and an air return temperature sensor are arranged on the evaporator; the refrigerant system is characterized in that a refrigerant passage is connected by a refrigerant pipeline, the refrigerant pipeline is composed of a central tube and an outer sleeve, a hollow cavity is arranged between the central tube and the outer sleeve, and pressure sensors are arranged on the inner walls of the central tube and the outer sleeve and used for detecting the air pressure inside the central tube and the outer sleeve.
Preferably, the pipe diameter of the outer sleeve is larger than that of the central pipe, a hollow cavity is formed between the outer sleeve and the central pipe, and the pressure of the hollow cavity is larger than the pressure outside the outer sleeve and smaller than the pressure in the central pipe; the pipe wall of the central pipe is also provided with a first convex cavity, the pipe wall of the outer sleeve is also provided with a second convex cavity, and a first pressure sensor and a second pressure sensor are respectively arranged in the first convex cavity and the second convex cavity and are respectively used for detecting the pressure of a refrigerant in the central pipe and the pressure in the middle hollow cavity; the measuring device comprises a hollow cavity, a first convex cavity and a second convex cavity, wherein the hollow cavity is provided with a cavity partition wall, the cavity partition wall is used for partitioning the hollow cavity into different measuring sections, the central pipe and the outer sleeve corresponding to each measuring section are respectively provided with the first convex cavity and the second convex cavity, and each of the first convex cavity and the second convex cavity is respectively provided with the first pressure sensor and the second pressure sensor.
A refrigerant leakage detection method of an air-conditioning refrigerant system uses the air-conditioning refrigerant system, and comprises the following steps:
s1: calculating a difference value between an air conditioner running current value and a current standard value, judging whether the air conditioner enters a self-checking stage or not according to the ratio of the difference value to the current standard value, if so, executing S2, otherwise, continuing executing S1;
s2: judging whether the flow meters work normally or not according to flow values Q1 and Q2 detected by flow meters at an air inlet and an air outlet of the compressor in unit time, if so, executing S3, otherwise, stopping the operation of the compressor, replacing the flow meters and continuing executing S2;
s3: determining whether the refrigerant system has a refrigerant leakage risk according to the ratio of the absolute value of the difference value between Q1 and Q2 to the calculated actual mass flow, if so, executing S4, and if not, continuing to execute S3;
s4: according to internal pressure values P at different measurement sections of refrigerant pipelineInner partAnd an external pressure value POuter coverDetermining possible positions of refrigerant leakage;
s5: after the restoration, the air conditioner is started again, and the air conditioner return air temperature T is detected according to the restored air conditioner return air temperatureGo back toAnd the temperature T of the air supplyFeeding deviceAnd judging whether the refrigerant system works normally or not according to the absolute value of the difference value.
Preferably, the S1 includes:
s11: starting an air conditioner;
s12: the air conditioner operates for a first preset time duration;
s13: the air conditioner controller obtains the current outdoor temperature and the current value of the air conditioner running current;
s14: calculating a difference value between an air conditioner running current value and a current standard value, judging whether the ratio of the difference value to the current standard value is smaller than a preset threshold value, if so, starting a timer, and entering a self-checking stage; if not, execution continues with S14.
Preferably, the S2 includes:
s21: in the self-checking stage, flow values Q1 and Q2 in unit time detected by flow meters at an air inlet and an air outlet of the compressor are obtained for multiple times;
s22: judging whether the variance value of Q1 and the variance value of Q2 are both smaller than a preset variance threshold value, if so, entering S3 and executing a leakage judgment stage; if not, the sensor is considered to be abnormal, and the compressor is stopped until the sensor is replaced.
Preferably, the S3 includes:
judging whether the ratio of the absolute value of the difference value between Q1 and Q2 to the calculated actual mass flow is smaller than a preset proportional value or not; if yes, determining that the refrigerant leakage risk exists, executing S4, otherwise, returning to S21.
Preferably, the actual mass flow calculation method includes:
acquiring the intake specific volume of the compressor according to the intake temperature and the intake pressure of the compressor;
and calculating the actual mass flow of the refrigerant in the air-conditioning refrigerant system according to the intake specific volume and the volume flow.
Preferably, the S4 includes:
s41: detecting internal pressure values P at different measuring sections of refrigerant pipelineInner partAnd an external pressure value POuter coverIn which P isInner partFor values detected by the first pressure sensor at the corresponding measuring section, POuter coverJudging whether P at any measuring section is present for the value detected by the second pressure sensor at the corresponding measuring sectionInner partLess than a predetermined internal pressure value and POuter coverIf the pressure value is larger than the preset external pressure value, executing S42, otherwise, continuing executing S41;
s42: starting an electromagnetic relay to temporarily trip, and then recovering, wherein the counter records the triggering trip times of each measuring section respectively;
s43: judging whether the total trip times reaches a trip time threshold value, if so, executing S44, and if not, continuing executing S41;
s44: and judging that the refrigerant leaks, controlling the refrigerant circuit to be disconnected, communicating the refrigerant circuit with the refrigerant collecting device, and stopping the compressor after the refrigerant is recovered.
Preferably, the S5 includes:
after the air conditioner is repaired, the air conditioner is started again, and the air conditioner return air temperature T is detected after the air conditioner is repairedGo back toAnd the temperature T of the air supplyFeeding deviceWhether the absolute value of the difference of (a) satisfies the condition: i TGo back to-TFeeding device|/|ΔT|>B, if the difference value is met, judging that the refrigerant system normally works, wherein delta T is the difference value between the return air temperature and the supply air temperature corresponding to the current outdoor environment temperature under the set rotating speed and the air conditioner is in a leakage-free condition; b is a first set value and 1>B>0。
An air conditioner comprises the air conditioning refrigerant system.
The invention has the beneficial effects that: (1) the air conditioner has higher judgment accuracy on refrigerant leakage; (2) and the positioning of a leakage point on the air-conditioning pipeline is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an air conditioning refrigerant system according to the present invention;
FIG. 2 is a schematic cross-sectional view of a refrigerant pipeline according to the present invention;
FIG. 3 is a perspective view of a refrigerant pipeline according to the present invention;
FIG. 4 is a logic diagram of a refrigerant leakage detection method for an air conditioning refrigerant system according to the present invention;
FIG. 5 is a logic diagram illustrating the step S1 in FIG. 4;
FIG. 6 is a logic diagram illustrating the step S2 in FIG. 4;
fig. 7 is a logic diagram of step S4 in fig. 4.
Description of the reference numerals
To further clarify the structure and connection between the various components of the present invention, the following reference numerals are given and described.
1-an evaporator; 11-an air outlet temperature sensor; 12-return air temperature sensor; 13-evaporator outlet valve; 2-a condenser; 21-outdoor temperature sensor; 22-condenser inlet valve; 3-a four-way valve; 4-a gas-liquid separator; 5-a compressor; 51-a first flow meter; 52-a second flow meter; 6-refrigerant pipeline; 61-a central tube; 611-a first convex cavity; 612-a first pressure sensor; 621-a second convex cavity; 622-second pressure sensor; 62-outer sleeve; 63-a hollow cavity; 631-cavity partition wall; 7-a first refrigerant collecting pipe; 71-a first choke; 72-first refrigerant collecting pipe control valve; 8-a refrigerant collecting tank; 9-a second refrigerant collecting pipe; 91-a second choke; 92-a second refrigerant collecting pipe control valve.
The technical scheme of the invention can be more clearly understood and explained by combining the embodiment of the invention through the reference sign description.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. 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 invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification 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.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
The present invention will be described in detail below by way of examples.
A refrigerant leakage detection method of an air-conditioning refrigerant system is disclosed, as shown in figure 1 and figure 2, the refrigerant system comprises an evaporator 1 positioned at the indoor side, a condenser 2 positioned at the outdoor side, a four-way valve 3, a gas-liquid separator 4 and a compressor 5, a first flowmeter 51 and a second flowmeter 52 are respectively arranged at an air suction port and an air outlet of the compressor 5, an outdoor temperature sensor 21 is arranged on the condenser 2, and an air outlet temperature sensor 11 and a return air temperature sensor 12 are arranged on the evaporator 1; the refrigerant system is characterized in that a refrigerant passage is connected by a refrigerant pipeline, the refrigerant pipeline 6 is composed of a central pipe 61 and an outer sleeve 62, a hollow cavity 63 is arranged between the central pipe 61 and the outer sleeve 62, and pressure sensors are arranged on the inner walls of the central pipe 61 and the outer sleeve 62 and used for detecting the air pressure inside the central pipe and the outer sleeve.
Further, as shown in fig. 2 and fig. 3, for a schematic diagram of a refrigerant pipeline provided by the present invention, as can be seen from fig. 2, a pipe diameter of the outer sleeve 62 is greater than a pipe diameter of the central pipe 61, a hollow cavity 63 is formed between the outer sleeve 62 and the central pipe 61, and a pressure of the hollow cavity 63 is greater than an outer pressure of the outer sleeve 62 and less than an inner pressure of the central pipe 61, so that if the central pipe 61 leaks, a pressure of the hollow cavity 63 increases, and if the outer sleeve 62 leaks, a pressure of the hollow cavity 63 decreases, in this embodiment, a refrigerant flows through the central pipe 61, and air flows through the outer sleeve 62. Further, a first convex cavity 611 is further arranged on the tube wall of the central tube 61, a second convex cavity 621 is further arranged on the tube wall of the outer sleeve 62, and a first pressure sensor 612 and a second pressure sensor 622 are respectively arranged in the first convex cavity 611 and the second convex cavity 621 and are respectively used for detecting the pressure of the refrigerant in the central tube and the pressure in the hollow cavity 63.
Further, in the hollow cavity 63, a cavity partition wall 631 is further provided, the cavity partition wall 631 is used for dividing the hollow cavity 63 into different measurement sections, a first convex cavity 611 and a second convex cavity 621 are respectively provided on the central tube 61 and the outer sleeve 62 corresponding to each measurement section, and a first pressure sensor 612 and a second pressure sensor 622 are respectively provided in each first convex cavity 611 and each second convex cavity 621. By adopting the mode to design the refrigerant pipeline, the possible leakage part of the refrigerant can be determined by subsection, and information is provided for the detection of the leakage point on the pipeline in the later period.
A refrigerant leakage detection method for an air-conditioning refrigerant system using the air-conditioning refrigerant systems shown in fig. 1 and 2, as shown in fig. 4, the refrigerant leakage detection method comprising:
s1: and calculating a difference value between the air conditioner running current value and the current standard value, judging whether the air conditioner enters a self-checking stage according to the ratio of the difference value to the current standard value, if so, executing S2, and if not, continuing executing S1.
S2: and judging whether the flow meters work normally or not according to flow rate values Q1 and Q2 detected by flow meters at the air inlet and the air outlet of the compressor in unit time, if so, executing S3, otherwise, stopping the operation of the compressor, replacing the flow meters and continuously executing S2.
S3: and determining whether the refrigerant system has a refrigerant leakage risk according to the ratio of the absolute value of the difference value between Q1 and Q2 to the calculated actual mass flow, if so, executing S4, and if not, continuing to execute S3.
S4: according to internal pressure values P at different measurement sections of refrigerant pipelineInner partAnd an external pressure value POuter coverAnd determining the possible leakage position of the refrigerant.
S5: after the restoration, the air conditioner is started again, and the air conditioner return air temperature T is detected according to the restored air conditioner return air temperatureGo back toAnd the temperature T of the air supplyFeeding deviceAnd judging whether the refrigerant system works normally or not according to the absolute value of the difference value.
Specifically, as shown in fig. 5, the S1 specifically includes:
s11: the air conditioner is turned on.
S12: the air conditioner operates for a first preset time duration.
S13: the air conditioner controller obtains the current outdoor temperature and the current value of the air conditioner running current.
Specifically, the air conditioner collects the temperature detected by the outdoor temperature sensor for multiple times within a second preset time duration, performs average operation on the collected temperatures for multiple times, and takes the obtained average temperature value as the current outdoor temperature value.
S14: calculating a difference value between an air conditioner running current value and a current standard value, judging whether the ratio of the difference value to the current standard value is smaller than a preset threshold value, if so, starting a timer, and entering a self-checking stage; if not, execution continues with S14.
The current standard value is an air conditioner running current value corresponding to the current outdoor environment temperature of the air conditioner under the condition of no leakage, and the value is recorded in an internal storage space of the controller in the form of a comparison table and is obtained by carrying out actual measurement one by one in a factory test mode.
Specifically, as shown in fig. 6, step S2 further includes:
s21: in the self-test stage, flow values Q1 and Q2 per unit time detected by flow meters at the air inlet and the air outlet of the compressor are acquired multiple times.
S22: judging whether the variance value of Q1 and the variance value of Q2 are both smaller than a preset variance threshold value, if so, entering S3 and executing a leakage judgment stage; if not, the sensor is considered to be abnormal, and the compressor is stopped until the sensor is replaced.
Because the flowmeter usually works in a high-pressure environment, and high-pressure damage is easy to occur after long-time use, the damage usually appears as large-range jitter of the flowmeter indication in a short time, if the variance value of Q1 and the variance value of Q2 are both smaller than a preset variance threshold, the flowmeter at the compressor air inlet for detecting the Q1 value and the flowmeter at the compressor air outlet for detecting the Q2 value do not generate large-range jitter in the measuring period, the current work of the flowmeter is normal, and leakage judgment can be carried out according to flow data obtained from the flowmeter.
If at least one of the variance value of Q1 and the variance value of Q2 is less than the preset variance threshold, it indicates that at least one flow meter has a fault and needs to be repaired or replaced. Specifically, at this time, the air conditioner controller controls the compressor to stop until the flow meter with the fault is replaced, and the compressor is started to operate. The air conditioning controller repeatedly determines whether or not an abnormality removing operation (replacement of the failed flowmeter) has been performed on itself. When the abnormality removing operation is judged to be performed on the controller, the operation of the compressor is controlled again.
Specifically, the step S3 includes:
judging whether the ratio of the absolute value of the difference value between Q1 and Q2 to the calculated actual mass flow is smaller than a preset proportional value or not; if yes, determining that the refrigerant leakage risk exists, executing S4, otherwise, returning to S21.
In this embodiment, after the air conditioning unit is powered on and operates for a certain time, the temperature sensing bulb arranged at the compressor is used to obtain the air inlet temperature at the air inlet of the compressor in the air conditioning system, and the pressure sensor arranged at the air outlet of the compressor is used to obtain the air inlet pressure of the compressor in the air conditioning system, so that the operation time of the air conditioning system is at least 8 minutes.
Specifically, in this embodiment, the actual mass flow of the refrigerant in the air conditioning system is calculated according to the intake air temperature and the intake air pressure.
Further, the process of calculating the actual mass flow of the refrigerant in the air conditioning system according to the intake air temperature and the intake air pressure includes:
acquiring the intake specific volume of the compressor according to the intake temperature and the intake pressure;
and calculating the actual mass flow of the refrigerant in the air-conditioning system according to the intake specific volume and the volume flow. The specific volume of the inlet air can be found out by looking up a table according to the inlet air temperature, the inlet air pressure and a pressure-enthalpy diagram data table stored in the air conditioning system; the volumetric flow of the compressor is a known, fixed and unchanging parameter of the compressor, an inherent parameter known to those skilled in the art. The actual mass flow of the refrigerant is equal to the ratio of the volume flow to the intake specific volume, that is, the actual mass flow of the refrigerant in the air conditioning system is equal to the volume flow of the compressor divided by the intake specific volume of the compressor.
Theoretically, when the refrigerant circulates in the refrigerant circuit, the refrigerant flow rate per unit time in each position in the refrigerant circuit should be consistent, namely | Q1-Q2| should be 0, but in practice, because the temperature and the state of the refrigerant are different at different stages of the refrigerant circuit, even if no refrigerant leakage occurs, the actually measured | Q1-Q2| value is not 0, and the situation is more obvious when the refrigerant circuit pipeline is too long. However, the actual length of the refrigerant circuit of the air conditioner needs to be increased, which is determined by actual installation conditions such as the distance between the outdoor unit and the indoor unit, and which cannot be determined and estimated in advance at the time of shipping the air conditioner, so that it is necessary to determine the actual flow rate difference by using an actual measurement method. By calculating the ratio of the absolute value of the difference between Q1 and Q2 to the calculated actual mass flow, whether the air-conditioning refrigerant has the risk and possibility of leakage can be determined more intuitively.
Specifically, as shown in fig. 7, the step S4 includes:
s41: detecting internal pressure values P at different measuring sections of refrigerant pipelineInner partAnd an external pressure value POuter coverIn which P isInner partFor values detected by the first pressure sensor at the corresponding measuring section, POuter coverJudging whether P at any measuring section is present for the value detected by the second pressure sensor at the corresponding measuring sectionInner partLess than a predetermined internal pressure value and POuter coverIf the pressure value is larger than the preset external pressure value, S42 is executed, and if not, S41 is continuously executed.
S42: starting the electromagnetic relay to temporarily trip, and then recovering, and respectively recording the triggering trip times of each measuring section by the counter.
In the invention, the electromagnetic relay is connected with a temporary tripping function, and the counter can record the tripping times of the electromagnetic relay. If P at any one measurement sectionInner partLess than a predetermined internal pressure value and POuter coverIf the pressure is higher than the preset external pressure value, the possibility of refrigerant leakage at the refrigerant pipeline is indicated. In the present invention, in the case of the present invention,
s43: and judging whether the total trip times reaches a trip time threshold value, if so, executing S44, and if not, continuing executing S41.
S44: and judging that the refrigerant leaks, controlling the refrigerant circuit to be disconnected, communicating the refrigerant circuit with the refrigerant collecting device, and stopping the compressor after the refrigerant is recovered.
Specifically, as shown in fig. 1, the refrigerant circuit is communicated with a refrigerant collecting device through a first refrigerant collecting pipe 7, and the refrigerant collecting device includes a refrigerant collecting tank 8, and a first restrictor 71 and a first refrigerant collecting pipe control valve 72 which are arranged between the refrigerant collecting tank and the refrigerant output end of the compressor.
A condenser inlet valve 22 is further arranged at the liquid inlet of the condenser 2, a controller of the air conditioning system is used for controlling the refrigerant working circuit to be disconnected by closing the condenser inlet valve 22 of the refrigerant working circuit when the refrigerant leakage is judged, controlling the refrigerant collecting pipe to be connected with the refrigerant output end of the compressor to carry out the refrigerant recovery work by opening the first refrigerant collecting pipe control valve 72, and controlling the compressor to stop after the refrigerant recovery work is finished. The controller is further configured to control the refrigerant working circuit to be switched on by opening the condenser inlet valve 22 when it is determined that the refrigerant is not leaked, and control the refrigerant collecting pipe to be disconnected from the refrigerant output end of the compressor by closing the first refrigerant collecting pipe control valve 72, so that the compressor operates normally.
Further, the refrigerant circuit further includes a second refrigerant collecting pipe 9, one end of the second refrigerant collecting pipe 9 is disposed on the pipe between the evaporator 1 and the four-way valve 3, the other end is connected with the refrigerant collecting tank 8, a second throttle 91 and a second refrigerant collecting pipe control valve 92 are disposed on the second refrigerant collecting pipe 9, an evaporator outlet valve 13 is disposed at a side of a joint of the evaporator 1 and the four-way valve 3, the side is close to the evaporator, the first refrigerant collecting pipe control valve 72 and the second refrigerant collecting pipe control valve 92 are in a normally closed state, the condenser inlet valve 22 and the evaporator outlet valve 13 in the refrigerant working circuit are in a normally open state, the first refrigerant collecting pipe control valve 72, the second refrigerant collecting pipe control valve 92, the condenser inlet valve 22 and the evaporator outlet valve 13 are electrically connected with a controller of the air conditioning system, and the controller controls the first refrigerant collecting pipe control valve 72, The second refrigerant collecting pipe control valve 92, the condenser inlet valve 22 and the evaporator outlet valve 13 are used for controlling the on-off of the refrigerant working circuit and the refrigerant collecting pipe.
When the refrigerant is recovered in a refrigeration state of the air conditioner, the controller controls the condenser inlet valve 22 to be disconnected, the first refrigerant collecting pipe control valve 72 is switched on, the high-pressure gaseous refrigerant is changed into a low-temperature and low-pressure liquid refrigerant through the compressor 3 through the four-way valve 3, the first refrigerant collecting pipe control valve 72 and the first throttle 71 and is stored in the refrigerant collecting tank 8, and after the refrigerant is recovered, the controller controls the first refrigerant collecting pipe control valve 72 to be disconnected, so that the compressor is stopped. Thus, the recovery of the refrigerant and the shutdown of the compressor under the refrigeration state are realized.
Similarly, when the refrigerant is recovered in the heating state of the air conditioner, the controller controls the outlet valve 13 of the evaporator to be disconnected, the second refrigerant collecting pipe control valve 92 is turned on, the high-pressure gaseous refrigerant is changed into a low-temperature and low-pressure liquid refrigerant by the compressor 5 through the four-way valve 3, the second refrigerant collecting pipe control valve 92 and the second throttle 91 and is stored in the refrigerant collecting tank 8, and after the refrigerant is recovered, the controller controls the second refrigerant collecting pipe control valve 92 to be disconnected, and the compressor is stopped. Thus, the recovery of the refrigerant and the shutdown of the compressor in the heating state are realized.
S45: and determining the possible part of refrigerant leakage according to the tripping times.
In the invention, in order to further confirm the refrigerant leakage position, a counter is adopted to record the triggering tripping times of each measuring section respectively, and each measuring section is counted and counted respectively.
For example, the refrigerant pipeline has a first measurement section, a second measurement section and a third measurement section, the preset trip time threshold is 10 times, when the counter records 10 trips, the trip times contributed by the first measurement section, the second measurement section and the third measurement section are 2 times, 6 times and 2 times respectively, which indicates that the leakage part is most likely to appear near the second measurement section, and is more beneficial to determining the specific leakage position for refrigerant circuits with longer refrigerant pipelines and more measurement sections.
Specifically, the step S5 specifically includes:
after the air conditioner is repaired, the air conditioner is started again, and the air conditioner return air temperature T is detected after the air conditioner is repairedGo back toAnd the temperature T of the air supplyFeeding deviceWhether the absolute value of the difference of (a) satisfies the condition: i TGo back to-TFeeding device|/|ΔT|>B, if the difference value is met, judging that the refrigerant system normally works, wherein delta T is the difference value between the return air temperature and the supply air temperature corresponding to the current outdoor environment temperature under the set rotating speed and the air conditioner is in a leakage-free condition; b is a first set value and 1>B>0。
The refrigerant leakage prevention work of the air conditioner is a key problem in design, manufacture and construction of the whole air conditioner, a certain detection method is generally made to detect refrigerant leakage, and besides, a pipe valve which is not easy to leak and has stronger sealing performance is designed in the aspects of pipe valve design and the like. After the air conditioner is repaired, besides the judgment of the leakage of the refrigerant, the essence of the air conditioner, namely the temperature difference between the air supply temperature and the air return temperature, is needed to judge whether the refrigerant system works normally, the air conditioner which works normally inevitably has a certain temperature difference between the air supply temperature and the air return temperature, and if the temperature difference between the air supply temperature and the air return temperature of the repaired air conditioner does not reach the preset level, even if all the judgments can pass smoothly, the normal work of the refrigerant system cannot be explained, and the refrigerant system needs to be further checked and repaired.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. The air-conditioning refrigerant system is characterized by comprising an evaporator (1) positioned at the indoor side, a condenser (2) positioned at the outdoor side, a four-way valve (3), a gas-liquid separator (4) and a compressor (5), wherein a first flowmeter (51) and a second flowmeter (52) are respectively arranged at an air suction port and an air outlet of the compressor (5), an outdoor temperature sensor (21) is arranged on the condenser (2), and an air outlet temperature sensor (11) and an air return temperature sensor (12) are arranged on the evaporator (1); the refrigerant system is characterized in that a refrigerant passage is connected by a refrigerant pipeline, the refrigerant pipeline (6) is composed of a central pipe (61) and an outer sleeve (62), a hollow cavity (63) is arranged between the central pipe (61) and the outer sleeve (62), and pressure sensors are arranged on the inner walls of the central pipe (61) and the outer sleeve (62) and used for detecting the pressure inside the central pipe and the outer sleeve.
2. The air-conditioning refrigerant system according to claim 1, wherein the pipe diameter of the outer sleeve (62) is larger than that of the central pipe (61), and a hollow cavity (63) is formed between the outer sleeve (62) and the central pipe (61), and the pressure of the hollow cavity (63) is larger than the pressure outside the outer sleeve (62) and smaller than the pressure inside the central pipe (61); a first convex cavity (611) is further arranged on the tube wall of the central tube (61), a second convex cavity (621) is further arranged on the tube wall of the outer sleeve (62), and a first pressure sensor (612) and a second pressure sensor (622) are respectively arranged in the first convex cavity (611) and the second convex cavity (621) and are respectively used for detecting the pressure of the refrigerant in the central tube and the pressure in the hollow cavity (63); in the hollow cavity (63), a cavity partition wall (631) is further arranged, the cavity partition wall (631) is used for partitioning the hollow cavity (63) into different measuring sections, a first convex cavity (611) and a second convex cavity (621) are respectively arranged on a central pipe (61) and an outer sleeve (62) corresponding to each measuring section, and a first pressure sensor (612) and a second pressure sensor (622) are respectively arranged in each first convex cavity (611) and each second convex cavity (621).
3. The refrigerant leakage detection method of an air-conditioning refrigerant system using the air-conditioning refrigerant system according to claim 2, the refrigerant leakage detection method comprising:
s1: calculating a difference value between an air conditioner running current value and a current standard value, judging whether the air conditioner enters a self-checking stage or not according to the ratio of the difference value to the current standard value, if so, executing S2, otherwise, continuing executing S1;
s2: judging whether the flow meters work normally or not according to flow values Q1 and Q2 detected by flow meters at an air inlet and an air outlet of the compressor in unit time, if so, executing S3, otherwise, stopping the operation of the compressor, replacing the flow meters and continuing executing S2;
s3: determining whether the refrigerant system has a refrigerant leakage risk according to the ratio of the absolute value of the difference value between Q1 and Q2 to the calculated actual mass flow, if so, executing S4, and if not, continuing to execute S3;
s4: according to internal pressure values P at different measurement sections of refrigerant pipelineInner partAnd an external pressure value POuter coverDetermining possible positions of refrigerant leakage;
s5: after the repair, theStarting up again, detecting the return air temperature T of the air conditioner after repairingGo back toAnd the temperature T of the air supplyFeeding deviceAnd judging whether the refrigerant system works normally or not according to the absolute value of the difference value.
4. A refrigerant leakage detecting method for a refrigerant system of an air conditioner according to claim 3, wherein the S1 includes:
s11: starting an air conditioner;
s12: the air conditioner operates for a first preset time duration;
s13: the air conditioner controller obtains the current outdoor temperature and the current value of the air conditioner running current;
s14: calculating a difference value between an air conditioner running current value and a current standard value, judging whether the ratio of the difference value to the current standard value is smaller than a preset threshold value, if so, starting a timer, and entering a self-checking stage; if not, execution continues with S14.
5. A refrigerant leakage detecting method for a refrigerant system of an air conditioner according to claim 3, wherein the S2 includes:
s21: in the self-checking stage, flow values Q1 and Q2 in unit time detected by flow meters at an air inlet and an air outlet of the compressor are obtained for multiple times;
s22: judging whether the variance value of Q1 and the variance value of Q2 are both smaller than a preset variance threshold value, if so, entering S3 and executing a leakage judgment stage; if not, the sensor is considered to be abnormal, and the compressor is stopped until the sensor is replaced.
6. A refrigerant leakage detecting method for a refrigerant system of an air conditioner according to claim 3, wherein the S3 includes:
judging whether the ratio of the absolute value of the difference value between Q1 and Q2 to the calculated actual mass flow is smaller than a preset proportional value or not; if yes, determining that the refrigerant leakage risk exists, executing S4, otherwise, returning to S21.
7. The refrigerant leakage detection method of an air-conditioning refrigerant system according to claim 6, wherein the actual mass flow calculation method includes:
acquiring the intake specific volume of the compressor according to the intake temperature and the intake pressure of the compressor;
and calculating the actual mass flow of the refrigerant in the air-conditioning refrigerant system according to the intake specific volume and the volume flow.
8. A refrigerant leakage detecting method for a refrigerant system of an air conditioner according to claim 3, wherein the S4 includes:
s41: detecting internal pressure values P at different measuring sections of refrigerant pipelineInner partAnd an external pressure value POuter coverIn which P isInner partFor values detected by the first pressure sensor at the corresponding measuring section, POuter coverJudging whether P at any measuring section is present for the value detected by the second pressure sensor at the corresponding measuring sectionInner partLess than a predetermined internal pressure value and POuter coverIf the pressure value is larger than the preset external pressure value, executing S42, otherwise, continuing executing S41;
s42: starting an electromagnetic relay to temporarily trip, and then recovering, wherein the counter records the triggering trip times of each measuring section respectively;
s43: judging whether the total trip times reaches a trip time threshold value, if so, executing S44, and if not, continuing executing S41;
s44: and judging that the refrigerant leaks, controlling the refrigerant circuit to be disconnected, communicating the refrigerant circuit with the refrigerant collecting device, and stopping the compressor after the refrigerant is recovered.
9. A refrigerant leakage detecting method for a refrigerant system of an air conditioner according to claim 3, wherein the S5 includes:
after the air conditioner is repaired, the air conditioner is started again, and the air conditioner return air temperature T is detected after the air conditioner is repairedGo back toAnd the temperature T of the air supplyFeeding deviceWhether the absolute value of the difference of (a) satisfies the condition: i TGo back to-TFeeding device|/|ΔT|>B, if so, judging that the refrigerant system normally works, wherein delta T is the current outdoor environment temperature of the air conditioner under the leakage-free condition and the set rotating speedThe difference value of the return air temperature and the supply air temperature corresponding to the temperature; b is a first set value and 1>B>0。
10. An air conditioner, characterized in that the air conditioner comprises the air conditioning refrigerant system according to any one of claims 1 to 2.
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