CN111306851A - Refrigerant storage tank, multi-split air conditioner and refrigerant control method - Google Patents
Refrigerant storage tank, multi-split air conditioner and refrigerant control method Download PDFInfo
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- CN111306851A CN111306851A CN201911237939.9A CN201911237939A CN111306851A CN 111306851 A CN111306851 A CN 111306851A CN 201911237939 A CN201911237939 A CN 201911237939A CN 111306851 A CN111306851 A CN 111306851A
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
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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
- 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
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Abstract
The invention provides a coolant storage tank, comprising: a liquid storage tank body; the refrigerant containing part is arranged in the liquid storage tank body and is connected with a refrigerant inlet pipe and a refrigerant outlet pipe; and the refrigerant heat exchange tube is arranged in the liquid storage tank body and is used for carrying out heat exchange with the refrigerant containing part. Through setting up refrigerant heat exchange tube and refrigerant holding portion and carrying out the heat transfer, can conveniently realize the automatic storage of refrigerant and release refrigerant.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a refrigerant storage tank, a multi-split air conditioner and a refrigerant control method.
Background
At present, the refrigerant charge amount of the multi-split air conditioner is designed according to the operation requirements of all the internal machines and the external machines, but in the actual operation, the condition that the internal machines are not completely opened often occurs in the multi-split air conditioner, and especially in the high-temperature refrigeration process, redundant refrigerant can only be stored in a condenser, so that the operation of the unit is influenced by high-pressure protection.
Disclosure of Invention
The invention solves the problem of how to keep the multi-split air conditioner unit with proper refrigerant quantity all the time.
To solve the above problems, the present invention provides a coolant storage tank, comprising:
a liquid storage tank body;
the refrigerant containing part is arranged in the liquid storage tank body and is connected with a refrigerant inlet pipe and a refrigerant outlet pipe;
and the refrigerant heat exchange tube is arranged in the liquid storage tank body and is used for carrying out heat exchange with the refrigerant containing part.
Through setting up refrigerant heat exchange tube and refrigerant holding portion and carrying out the heat transfer, can conveniently realize the automatic storage of refrigerant and release refrigerant.
Further, the refrigerant heat exchange tube is disposed below the refrigerant accommodating portion, or the refrigerant heat exchange tube surrounds the refrigerant accommodating portion.
From this, carry out the heat transfer through the refrigerant heat exchange tube to the refrigerant in the refrigerant holding portion, realize the cooling of refrigerant and retrieve the refrigerant and heat up the release.
Furthermore, the refrigerant heat exchange tube is of a spiral structure.
Through setting up the refrigerant heat exchange tube into circuitous spiral structure, can increase the heat transfer area of refrigerant heat exchange tube at the refrigerant liquid storage pot to further improve the heat exchange efficiency of refrigerant heat exchange tube and refrigerant holding portion.
According to another aspect of the present invention, there is provided a multi-split air conditioner including:
the refrigerant storage tank is as described above;
the pressure sensor group is used for detecting the pressure in the refrigerant storage tank, the system high pressure of the multi-split air conditioner and the system low pressure of the multi-split air conditioner;
the electromagnetic valve group comprises a plurality of electromagnetic valves which are respectively connected to the inlet and the outlet of the refrigerant containing part of the refrigerant liquid storage tank and two ends of the refrigerant heat exchange tube and used for controlling the flow of the refrigerant in the refrigerant containing part and the refrigerant heat exchange tube;
the first throttling element is connected to the refrigerant heat exchange tube and used for throttling the refrigerant entering the refrigerant heat exchange tube.
Therefore, the self-adaptive control of the refrigerant can be realized, and the refrigerant can be cooled and recovered and heated to release according to the starting and pressure conditions of the internal unit of the multi-split air conditioner.
Further, the solenoid valve group includes:
the first end of the first electromagnetic valve is connected with the refrigerant inlet pipe, and the second end of the first electromagnetic valve is connected with the first end of the outdoor heat exchanger;
the first end of the second electromagnetic valve is connected with the refrigerant outlet pipe, and the second end of the second electromagnetic valve is connected between a second throttling element and a stop valve which are connected with the outdoor heat exchanger;
a first end of the third electromagnetic valve is connected to the first end of the refrigerant heat exchange tube through the first throttling element, and a second end of the third electromagnetic valve is connected to the first end of the outdoor heat exchanger;
a first end of the fourth electromagnetic valve is connected to a second end of the refrigerant heat exchange tube, and a second end of the fourth electromagnetic valve is connected to an inlet of the gas-liquid separator;
and a first end of the fifth electromagnetic valve is connected to the second end of the refrigerant heat exchange tube, and a second end of the fifth electromagnetic valve is connected to an exhaust port of the compressor.
The opening and closing of the electromagnetic valve group can realize the cooling and refrigerant recovery and the heating and refrigerant release of the refrigerant storage tank.
Further, the first throttling element and the second throttling element are both electronic expansion valves.
Further, the pressure sensor group includes:
the first pressure sensor is arranged at the exhaust port of the compressor and used for detecting the system high pressure of the multi-split air conditioner;
the second pressure sensor is arranged at the inlet of the gas-liquid separator and used for detecting the system low pressure of the multi-split air conditioner;
and the third pressure sensor is arranged on a connecting pipeline of the refrigerant accommodating part of the liquid storage tank and used for detecting the tank internal pressure of the refrigerant liquid storage tank.
Therefore, the judgment process of the refrigerant self-adaptive control can be realized through the system high pressure, the system low pressure and the tank internal pressure of the refrigerant liquid storage tank which are obtained by the pressure sensor.
Further, the multi-split air conditioner further includes:
and the temperature sensor is used for detecting the temperature in the refrigerant liquid storage tank.
The temperature in the tank is judged through the temperature sensor, whether the refrigerant in the refrigerant heat exchange tube cooling refrigerant containing part needs to be controlled or not can be judged, and therefore the pressure in the tank of the liquid storage tank is guaranteed to be maintained in a safe range, and the refrigerant is conveniently and safely stored.
According to another aspect of the present invention, there is provided a refrigerant control method of a multi-split air conditioner, including:
s1, judging the running number of the internal machines of the multi-split air conditioner system, if the running number is larger than a first number threshold, turning to the step S2, otherwise, turning to the step S3;
s2, controlling the refrigerant storage tank to release the refrigerant, comparing the pressure in the refrigerant storage tank with the system high pressure of the multi-split air conditioner, and determining whether to stop releasing the refrigerant according to the comparison result;
and S3, judging whether the running number of the internal machines of the multi-split air conditioner system is smaller than a second number threshold, and controlling the refrigerant storage tank to release the refrigerant or recover the refrigerant according to the judgment result and the comparison result of the system high pressure or low pressure of the multi-split air conditioner and a preset threshold.
By the refrigerant control method, refrigerants can be automatically stored and released according to the starting and pressure conditions of the multi-split air conditioner internal unit, so that the air conditioner unit always keeps proper refrigerant quantity, and the stable operation of the unit is ensured.
Further, the first number threshold ranges from 0.75 to 0.85 of the total number of the multiple air-conditioner indoor units; and/or
The second quantity threshold value ranges from 0.55 to 0.65 of the total number of the multiple air-conditioner indoor units.
Further, in step S2, comparing the tank pressure of the refrigerant storage tank with the system high pressure of the multi-split air conditioner, and determining whether to stop releasing the refrigerant according to the comparison result includes:
if the pressure in the refrigerant liquid storage tank is less than or equal to the system high pressure of the multi-split air conditioner, controlling the refrigerant liquid storage tank to stop releasing the refrigerant;
and if the pressure in the refrigerant storage tank is higher than the system high pressure of the multi-split air conditioner, controlling the refrigerant storage tank to continuously release the refrigerant.
Therefore, when the pressure in the tank reaches a proper range after the refrigerant is released, the refrigerant can be stopped from being released, and the normal operation of the unit is ensured.
Further, the step S3 includes:
s301, if the running number of the inner machines of the multi-split air conditioner system is smaller than a second number threshold value, and the total number of the inner machines of the multi-split air conditioner is not less than a, comparing whether the system high pressure of the multi-split air conditioner is larger than a first preset high pressure threshold value or not, and if the system high pressure of the multi-split air conditioner is larger than the first preset high pressure threshold value as a comparison result, controlling a refrigerant storage tank to recover a refrigerant, wherein a is 3-5;
and S302, if the running number of the internal machines of the multi-split air conditioner system is greater than or equal to a second number threshold and smaller than a first number threshold, comparing whether the system low pressure of the multi-split air conditioner is smaller than a first preset low pressure threshold, and if the comparison result shows that the system low pressure of the multi-split air conditioner is greater than the first preset low pressure threshold, controlling a refrigerant storage tank to release the refrigerant.
Therefore, under the condition that the starting number of the internal machines of the multi-split air conditioner is small, whether the refrigerant needs to be recovered or not can be judged according to the high-pressure condition of the system; when the number of the internal machines is moderate, whether the refrigerants need to be released currently is judged through the low pressure of the system.
Further, the step S301 further includes:
after the refrigerant storage tank is controlled to recover the refrigerant, comparing whether the system high pressure of the multi-split air conditioner is less than or equal to a second preset high pressure threshold value or not, if the system high pressure of the multi-split air conditioner is less than or equal to the second preset high pressure threshold value, controlling the refrigerant storage tank to stop recovering the refrigerant, otherwise, continuously controlling the refrigerant storage tank to recover the refrigerant; and/or
The step S302 further includes:
and after the refrigerant storage tank is controlled to release the refrigerant, comparing whether the system high pressure of the multi-split air conditioner is less than or equal to a second preset low pressure threshold value, if the system high pressure of the multi-split air conditioner is greater than or equal to the second preset low pressure threshold value, controlling the refrigerant storage tank to stop releasing the refrigerant, otherwise, continuously controlling the refrigerant storage tank to release the refrigerant.
Therefore, the refrigerant can be released or recovered until the system pressure reaches a proper range, and then the refrigerant can be released or recovered.
Further, the first preset high-pressure threshold value is 3.85-3.95 MPa, and the second preset high-pressure threshold value is 3.65-3.75 MPa; and/or
The first preset low-pressure threshold value is 0.65-0.85 Mpa, and the second preset low-pressure threshold value is 0.85-0.95 Mpa.
Further, the step S301 further includes:
after the system high pressure of the multi-split air conditioner is compared with a first preset high pressure threshold value, if the comparison result shows that the system high pressure of the multi-split air conditioner is smaller than or equal to the first preset high pressure threshold value, the current state of the refrigerant liquid storage tank is kept, and the system normally operates; and/or
The step S302 further includes:
and after the comparison result shows that the system high pressure of the multi-split air conditioner is greater than or equal to the first preset low pressure threshold value, the current state of the refrigerant liquid storage tank is kept and the system normally operates.
Further, the method for releasing the refrigerant from the refrigerant storage tank comprises the following steps:
controlling to open the fifth electromagnetic valve, the third electromagnetic valve and the first throttling element, enabling a high-temperature and high-pressure refrigerant flowing out of the exhaust port of the compressor to pass through a refrigerant heat exchange tube of the refrigerant liquid storage tank, and heating the refrigerant in the refrigerant containing part by the refrigerant heat exchange tube; and when the pressure in the tank is increased to be higher than the system low pressure of the multi-split air conditioner, the second electromagnetic valve is opened, and the refrigerant is released.
Further, the method for recovering the refrigerant by the refrigerant storage tank comprises the following steps:
opening the third electromagnetic valve, the fourth electromagnetic valve and the first throttling element, allowing the medium-temperature high-pressure refrigerant flowing out of the outlet of the outdoor heat exchanger to enter a refrigerant heat exchange tube of the refrigerant liquid storage tank after being throttled by the first throttling element, and cooling the refrigerant in the refrigerant containing part by the refrigerant heat exchange tube; and when the pressure in the tank is reduced to be lower than the system high pressure of the multi-split air conditioner, the first electromagnetic valve is opened, and the refrigerant is recovered.
Further, after the refrigerant is recovered, when the pressure in the refrigerant storage tank is higher than the system high pressure of the multi-split air conditioner, or the temperature in the refrigerant storage tank is higher than the system high pressure corresponding saturation temperature + b of the multi-split air conditioner, where b is 1 to 3 ℃, the third electromagnetic valve, the fourth electromagnetic valve and the first throttling element are opened, the medium-temperature high-pressure refrigerant flowing out of the outlet of the outdoor heat exchanger enters the refrigerant heat exchange tube after being throttled by the first throttling element, and the refrigerant in the refrigerant accommodating part is cooled by the refrigerant heat exchange tube.
Further, the method further comprises:
and S4, when the multi-split air conditioner is shut down, closing the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve and the first throttling element of the electromagnetic valves.
Therefore, after the multi-split air conditioner system is electrified again, the refrigerant self-adaptive unit is not started in the initial state, and then the refrigerant liquid storage tank is controlled to automatically store and release the refrigerant according to the actual starting condition and pressure condition of the indoor unit, so that the air conditioner unit always keeps the appropriate refrigerant quantity.
Drawings
FIG. 1a is a schematic structural diagram of a refrigerant storage tank according to an embodiment of the present invention;
FIG. 1b is a schematic view of an internal structure of a refrigerant reservoir according to an embodiment of the present invention;
FIG. 1c is a schematic structural diagram of a refrigerant heat exchange tube according to an embodiment of the present invention;
fig. 2a-2b are schematic structural views of a multi-split air conditioner according to an embodiment of the present invention;
fig. 3 is a flow chart illustrating a refrigerant control method of a multi-split air conditioner according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a refrigerant control method of a multi-split air conditioner according to an embodiment of the present invention;
FIG. 5a is a schematic diagram illustrating a refrigerant flow direction of the refrigerant recovery process of the refrigerant adaptive unit according to the present invention;
fig. 5b is a schematic diagram of the refrigerant flow direction in the refrigerant releasing process of the refrigerant adaptive unit according to the present invention.
Description of the reference numerals
1-a liquid storage tank body; 2-a refrigerant accommodating part; 3-refrigerant heat exchange tubes; 21-refrigerant inlet pipe; 22-refrigerant outlet pipe.
Detailed Description
At present, the refrigerant charge capacity of a multi-split air conditioner is designed according to the requirement that all internal and external units keep running, and in the practical application and running process of the multi-split air conditioner, the condition that only part of the internal and external units work often occurs, especially in a high-temperature refrigeration mode, a liquid storage tank can only store gaseous refrigerants at high temperature, the storage capacity is small, and therefore redundant refrigerants can only be stored in a condenser, so that the pressure of a condenser pipeline is too high easily, high-pressure protection is triggered, and the running of an air conditioner unit is influenced.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The invention provides a refrigerant self-adaptive control device and a control method of a multi-split air conditioner.
In one illustrative embodiment of the present invention, a refrigerant reservoir is provided. Fig. 1a is a schematic structural view of a refrigerant reservoir according to an embodiment of the present invention, and as shown in fig. 1a, the refrigerant reservoir includes: liquid storage pot body 1, refrigerant holding portion 2 and refrigerant heat exchange tube 3. The refrigerant accommodating part 2 is arranged in the liquid storage tank body 1 and is connected with a refrigerant inlet pipe 21 and a refrigerant outlet pipe 22; the refrigerant heat exchange tube 3 is arranged in the liquid storage tank body 1 and is used for exchanging heat with the refrigerant accommodating part 2. Through setting up refrigerant heat exchange tube 3 and refrigerant holding portion 2 and carrying out the heat transfer, can conveniently realize the automatic storage of refrigerant and release refrigerant.
Fig. 1b is a schematic view of an internal structure of a refrigerant reservoir according to an embodiment of the present invention. As shown in fig. 1b, the refrigerant heat exchanging tube 3 is disposed below the refrigerant accommodating portion 2, so as to heat the refrigerant in the refrigerant accommodating portion 2 conveniently. It is understood that the refrigerant heat exchange tubes 3 may also adopt any arrangement that is beneficial for heating the refrigerant accommodating portion 2. For example, the refrigerant heat exchange tube 3 may also be disposed around the refrigerant accommodating portion 2.
Fig. 1c is a schematic structural diagram of a refrigerant heat exchange tube 3 according to an embodiment of the present invention. As shown in fig. 1c, the refrigerant heat exchange tube 3 adopts a spiral structure, and the spiral structure is arranged on the refrigerant heat exchange tube 3 to increase the heat exchange area of the refrigerant heat exchange tube 3 in the refrigerant liquid storage tank, so that the heat exchange efficiency of the refrigerant heat exchange tube 3 and the refrigerant accommodating part 2 is further improved.
In a second exemplary embodiment of the present invention, a multi-split air conditioner is provided. Fig. 2a-2b are schematic structural views of a multi-split air conditioner according to an embodiment of the present invention, wherein fig. 2a illustrates a refrigerant flow direction in a cooling mode; fig. 2b shows the refrigerant flow direction in the heating mode. As shown in fig. 2, a refrigerant self-adaptation unit is added to the multi-split air conditioner, and the refrigerant self-adaptation unit includes a refrigerant storage tank as described in the first embodiment, and a pressure sensor group, an electromagnetic valve group, and a first throttling element connected to the refrigerant storage tank. By arranging the refrigerant self-adaptive unit, the refrigerant self-adaptive control can be realized, and the refrigerant can be recovered and released by heating according to the starting of the multi-split air conditioner internal unit and the pressure condition.
The pressure sensor group is used for detecting the pressure in the refrigerant storage tank, the system high pressure of the multi-split air conditioner and the system low pressure of the multi-split air conditioner. Specifically, the pressure sensor group includes a first pressure sensor D1, a second pressure sensor D2, and a third pressure sensor D3. The judgment process of the refrigerant self-adaptive control can be realized through the system high pressure, the system low pressure and the pressure in the refrigerant storage tank which are obtained by the pressure sensor.
The first pressure sensor D1 is arranged at the exhaust port of the compressor and used for detecting the system high pressure of the multi-split air conditioner.
And the second pressure sensor D2 is arranged at the inlet of the gas-liquid separator and is used for detecting the system low pressure of the multi-split air conditioner.
The third pressure sensor D3 is disposed on a connection pipeline of the refrigerant accommodating portion 2 of the liquid storage tank, and is configured to detect a tank internal pressure of the refrigerant storage tank.
The solenoid valve group comprises a plurality of solenoid valves which are respectively connected to the inlet and the outlet of the refrigerant containing part 2 of the refrigerant liquid storage tank and two ends of the refrigerant heat exchange tube 3 and used for controlling the flow of the refrigerant in the refrigerant containing part 2 and the refrigerant heat exchange tube 3. Specifically, the solenoid valve set includes a first solenoid valve C1, a second solenoid valve C2, a third solenoid valve C3, a fourth solenoid valve C4, and a fifth solenoid valve C5. The opening and closing of the electromagnetic valve group can realize the cooling and refrigerant recovery and the heating and refrigerant release of the refrigerant storage tank.
The first end of the first electromagnetic valve C1 is connected to the refrigerant inlet pipe 21, and the second end is connected to the first end of the outdoor heat exchanger C1.
And a second electromagnetic valve C2, wherein a first end of the second electromagnetic valve C2 is connected to the refrigerant outlet pipe 22, and a second end is connected between a second throttling element connected to the outdoor heat exchanger and a stop valve. Illustratively, the second throttling element is an electronic expansion valve.
And a third electromagnetic valve C3, a first end of the third electromagnetic valve C3 is connected to the first end of the refrigerant heat exchange tube 3 through a first throttling element, and a second end of the third electromagnetic valve C3 is connected to the first end of the outdoor heat exchanger.
And a fourth electromagnetic valve C4, wherein a first end of the fourth electromagnetic valve C4 is connected to a second end of the refrigerant heat exchange tube 3, and a second end of the fourth electromagnetic valve C4 is connected to an inlet of the gas-liquid separator.
And a fifth electromagnetic valve C5, wherein a first end of the fifth electromagnetic valve C5 is connected to a second end of the refrigerant heat exchange tube 3, and a second end is connected to a discharge port of the compressor.
The first throttling element a1 is connected to the refrigerant heat exchange tube 3 and is used for throttling the refrigerant entering the refrigerant heat exchange tube 3. Specifically, when the refrigerant storage tank needs to recover the refrigerant, the third solenoid valve C3, the fourth solenoid valve C4 and the first throttling element a1 are opened, the medium-temperature high-pressure refrigerant flowing out of the outlet of the outdoor heat exchanger enters the refrigerant heat exchange tube 3 of the refrigerant storage tank after being throttled by the first throttling element a1, and thus the refrigerant heat exchange tube 3 cools the refrigerant in the refrigerant accommodating part 2. Illustratively, the first throttling element a1 is an electronic expansion valve.
Further, the multi-split air conditioner further comprises a temperature sensor B. In this embodiment, the temperature sensor B is disposed below the liquid storage tank body 1 of the refrigerant liquid storage tank, and is configured to detect a temperature inside the refrigerant liquid storage tank. Through judging the tank interior temperature, can judge whether need control refrigerant heat exchange tube 3 cooling refrigerant holding portion 2's refrigerant to guarantee the tank internal pressure of liquid storage pot and maintain at safe scope, make things convenient for the safe storage of refrigerant.
In a third exemplary embodiment of the present invention, a refrigerant control method of a multi-split air conditioner is provided. Fig. 3 is a flowchart illustrating a refrigerant control method of a multi-split air conditioner according to an embodiment of the present invention. As shown in fig. 3, the refrigerant control method includes:
s1, judging the running number of the internal machines of the multi-split air conditioner system, if the running number is larger than a first number threshold, turning to the step S2, otherwise, turning to the step S3;
s2, controlling the refrigerant storage tank to release the refrigerant, comparing the pressure in the refrigerant storage tank with the system high pressure of the multi-split air conditioner, and determining whether to stop releasing the refrigerant according to the comparison result;
and S3, judging whether the running number of the internal machines of the multi-split air conditioner system is smaller than a second number threshold, and controlling the refrigerant storage tank to release the refrigerant or recover the refrigerant according to the judgment result and the comparison result of the system high pressure or low pressure of the multi-split air conditioner and a preset threshold.
By the refrigerant control method, refrigerants can be automatically stored and released according to the starting and pressure conditions of the multi-split air conditioner internal unit, so that the air conditioner unit always keeps proper refrigerant quantity, and the stable operation of the unit is ensured.
Fig. 4 is a flowchart illustrating a refrigerant control method of a multi-split air conditioner according to an embodiment of the present invention. As shown in fig. 4, the comparing the tank pressure of the refrigerant storage tank with the system high pressure of the multi-split air conditioner and determining whether to stop releasing the refrigerant according to the comparison result in step S2 further includes:
s201, if the pressure in the refrigerant liquid storage tank is less than or equal to the system high pressure of the multi-split air conditioner, controlling the refrigerant liquid storage tank to stop releasing the refrigerant;
and S202, if the pressure in the refrigerant storage tank is higher than the system high pressure of the multi-split air conditioner, controlling the refrigerant storage tank to continuously release the refrigerant.
Therefore, when the pressure in the tank reaches a proper range after the refrigerant is released, the refrigerant can be stopped from being released, and the normal operation of the unit is ensured.
Referring to fig. 3 again, in the present embodiment, the step S3 includes:
s301, if the running number of the internal machines of the multi-split air conditioner system is smaller than a second number threshold value, and the total number of the internal machines of the multi-split air conditioner is not less than a, comparing whether the system high pressure of the multi-split air conditioner is larger than a first preset high pressure threshold value:
if the comparison result shows that the system high pressure of the multi-split air conditioner is greater than a first preset high pressure threshold value, controlling a refrigerant liquid storage tank to recover the refrigerant, wherein a is 3-5;
and if the comparison result shows that the system high pressure of the multi-split air conditioner is less than or equal to a first preset high pressure threshold value, the current state of the refrigerant liquid storage tank is kept, and the system normally operates.
Therefore, under the condition that the number of the internal machines is small, whether the refrigerant needs to be recovered or not can be judged according to the high-pressure condition of the system.
Further, after the refrigerant storage tank is controlled to recover the refrigerant, whether the system high pressure of the multi-split air conditioner is smaller than or equal to a second preset high pressure threshold value or not is compared, if the system high pressure of the multi-split air conditioner is smaller than or equal to the second preset high pressure threshold value, the refrigerant storage tank is controlled to stop recovering the refrigerant, and otherwise, the refrigerant storage tank is continuously controlled to recover the refrigerant.
Therefore, when the pressure from the recovered refrigerant to the interior of the tank reaches a proper range, the recovery of the refrigerant can be stopped, and the normal operation of the unit is ensured.
Fig. 5a is a schematic diagram of a refrigerant flow direction in a refrigerant recovery process of the refrigerant adaptive unit according to the present invention. Referring to fig. 5a, the method for recovering refrigerant in the refrigerant reservoir includes:
the third electromagnetic valve C3, the fourth electromagnetic valve C4 and the first throttling element A1 are opened, the medium-temperature and high-pressure refrigerant flowing out of the outlet of the outdoor heat exchanger enters a refrigerant heat exchange tube of the refrigerant liquid storage tank after being throttled by the first throttling element, the refrigerant heat exchange tube cools the refrigerant in the refrigerant containing part and reduces the temperature, and therefore the pressure in the liquid storage tank is reduced (the pressure is lower when the temperature of the same-mass refrigerant is lower); when the pressure in the tank is reduced to be lower than the system high pressure of the multi-split air conditioner, the first electromagnetic valve C1 is opened, and the refrigerant is recovered.
Further, after the refrigerant is recovered, when the pressure in the refrigerant storage tank is higher than the system high pressure of the multi-split air conditioner, or the temperature in the refrigerant storage tank is higher than the system high pressure corresponding saturation temperature + b of the multi-split air conditioner, wherein b is 1-3 ℃, the third electromagnetic valve, the fourth electromagnetic valve and the first throttling element are opened, the medium-temperature high-pressure refrigerant flowing out of the outlet of the outdoor heat exchanger enters the refrigerant heat exchange tube after passing through the first throttling element throttling A1, and the refrigerant heat exchange tube cools the refrigerant in the refrigerant accommodating part to reduce the temperature, so that the pressure in the tank is reduced, and the refrigerant is conveniently and safely stored.
S302, if the running number of the internal machines of the multi-split air conditioner system is greater than or equal to a second number threshold and smaller than a first number threshold, comparing whether the system low pressure of the multi-split air conditioner is smaller than a first preset low pressure threshold:
if the comparison result shows that the system low pressure of the multi-split air conditioner is greater than a first preset low pressure threshold value, controlling a refrigerant storage tank to release the refrigerant;
and if the comparison result shows that the system low pressure of the multi-split air conditioner is greater than or equal to a first preset low pressure threshold value, the current state of the refrigerant liquid storage tank is kept, and the system normally operates.
Therefore, when the number of the indoor units of the multi-split air conditioner is moderate, whether the refrigerant needs to be released currently or not can be judged through the low pressure of the system.
Fig. 5b is a schematic diagram of the refrigerant flow direction in the refrigerant releasing process of the refrigerant adaptive unit according to the present invention. Referring to fig. 5b, the method for releasing the refrigerant from the refrigerant reservoir includes:
the fifth electromagnetic valve C5, the third electromagnetic valve C3 and the first throttling element A1 are controlled to be opened, high-temperature and high-pressure refrigerant flowing out of an exhaust port of the compressor passes through a refrigerant heat exchange tube of the refrigerant storage tank, the refrigerant heat exchange tube heats the refrigerant in the refrigerant storage part, the temperature is raised, and therefore the pressure in the storage tank is raised (the higher the temperature of the refrigerant with the same quality is), and the higher the pressure is; when the pressure in the tank rises to be higher than the system low pressure of the multi-split air conditioner, the second electromagnetic valve C2 is opened, and the refrigerant is released.
Further, after the refrigerant storage tank is controlled to release the refrigerant, whether the system low pressure of the multi-split air conditioner is smaller than or equal to a second preset low pressure threshold value or not is compared, if the system high pressure of the multi-split air conditioner is larger than or equal to the second preset low pressure threshold value, the refrigerant storage tank is controlled to stop releasing the refrigerant, and otherwise, the refrigerant storage tank is continuously controlled to release the refrigerant.
In this embodiment, the first number threshold is 0.8 × total number of multi-split air conditioner internal units, and the range of the second number threshold is 0.6 × total number of multi-split air conditioner internal units. Generally, the range of the first number threshold value may be 0.75 to 0.85 of the total number of the multiple-split air conditioner internal units according to the actual situation of the multiple-split air conditioner system; the second number threshold may range from 0.55 to 0.65 of the total number of multi-split air conditioner internal units.
In addition, in the embodiment, the first predetermined high pressure threshold is 3.9Mpa, and the second predetermined high pressure threshold is 3.7 Mpa; the first predetermined low pressure threshold is 0.7Mpa and the second predetermined low pressure threshold is 0.9 Mpa. Generally, the first preset high-pressure threshold value is set to be 3.85-3.95 MPa, and the second preset high-pressure threshold value is set to be 3.65-3.75 MPa according to the actual condition of a multi-split air conditioner system; and/or the first preset low-pressure threshold value is 0.65-0.75 Mpa, and the second preset low-pressure threshold value is 0.85-0.95 Mpa.
In some embodiments, the method further comprises:
and S4, when the multi-split air conditioner is shut down, closing a first electromagnetic valve C1, a second electromagnetic valve C2, a third electromagnetic valve C3, a fourth electromagnetic valve C4, a fifth electromagnetic valve C5 and a first throttling element A1.
Therefore, after shutdown, the refrigerant self-adaptive unit is not started, namely after power is supplied again, the multi-split air conditioner system is in an initial state that the refrigerant self-adaptive unit is not started, and then the refrigerant liquid storage tank is controlled to automatically store and release the refrigerant according to the starting condition and the pressure condition of the actual internal unit, so that the air conditioner unit always keeps a proper refrigerant amount.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (19)
1. A refrigerant reservoir, comprising:
a liquid storage tank body (1);
the refrigerant containing part (2) is arranged in the liquid storage tank body (1) and is connected with a refrigerant heat inlet pipe (21) and a refrigerant outlet pipe (22);
the liquid storage tank comprises a refrigerant heat exchange tube (3), wherein the refrigerant heat exchange tube (3) is arranged in the liquid storage tank body (1) and is used for carrying out heat exchange with the refrigerant accommodating part (2).
2. The refrigerant reservoir according to claim 1, wherein the refrigerant heat exchange tube (3) is disposed below the refrigerant accommodating portion (2), or the refrigerant heat exchange tube (3) is disposed around the refrigerant accommodating portion (2).
3. The refrigerant reservoir as claimed in claim 1, wherein the refrigerant heat exchange tube (3) is of a spiral structure.
4. A multi-split air conditioner, comprising:
the refrigerant reservoir as claimed in any one of claims 1 to 3;
the pressure sensor group is used for detecting the pressure in the refrigerant storage tank, the system high pressure of the multi-split air conditioner and the system low pressure of the multi-split air conditioner;
the electromagnetic valve group comprises a plurality of electromagnetic valves which are respectively connected to the inlet and the outlet of the refrigerant containing part (2) of the refrigerant liquid storage tank and the two ends of the refrigerant heat exchange tube (3) and used for controlling the flow of the refrigerant in the refrigerant containing part (2) and the refrigerant heat exchange tube (3);
the first throttling element is connected to the refrigerant heat exchange tube (3) and used for throttling the refrigerant entering the refrigerant heat exchange tube (3).
5. A multi-split air conditioner as set forth in claim 4, wherein said solenoid valve block comprises:
the first end of the first electromagnetic valve is connected with the refrigerant heat inlet pipe (21), and the second end of the first electromagnetic valve is connected with the first end of the outdoor heat exchanger;
the first end of the second electromagnetic valve is connected with the refrigerant inlet and outlet pipe (22), and the second end of the second electromagnetic valve is connected between a second throttling element and a stop valve which are connected with the outdoor heat exchanger;
a first end of the third electromagnetic valve is connected to the first end of the refrigerant heat exchange tube (3) through the first throttling element, and a second end of the third electromagnetic valve is connected to the first end of the outdoor heat exchanger;
a first end of the fourth electromagnetic valve is connected to a second end of the refrigerant heat exchange tube (3), and a second end of the fourth electromagnetic valve is connected to an inlet of the gas-liquid separator;
and a first end of the fifth electromagnetic valve is connected to a second end of the refrigerant heat exchange tube (3), and a second end of the fifth electromagnetic valve is connected to an exhaust port of the compressor.
6. A multi-split air conditioner as recited in claim 5, wherein said first and second throttling elements are electronic expansion valves.
7. A multi-split air conditioner as set forth in claim 4, wherein said pressure sensor group comprises:
the first pressure sensor is arranged at the exhaust port of the compressor and used for detecting the system high pressure of the multi-split air conditioner;
the second pressure sensor is arranged at the inlet of the gas-liquid separator and used for detecting the system low pressure of the multi-split air conditioner;
and the third pressure sensor is arranged on a connecting pipeline of the refrigerant accommodating part (2) of the liquid storage tank and is used for detecting the pressure in the liquid storage tank of the refrigerant.
8. A multi-split air conditioner as set forth in claim 4, further comprising:
and the temperature sensor is used for detecting the temperature in the refrigerant liquid storage tank.
9. A refrigerant control method of a multi-split air conditioner as set forth in any one of claims 4 to 8, comprising:
s1, judging the running number of the internal machines of the multi-split air conditioner system, if the running number is larger than a first number threshold, turning to the step S2, otherwise, turning to the step S3;
s2, controlling the refrigerant storage tank to release the refrigerant, comparing the pressure in the refrigerant storage tank with the system high pressure of the multi-split air conditioner, and determining whether to stop releasing the refrigerant according to the comparison result;
and S3, judging whether the running number of the internal machines of the multi-split air conditioner system is smaller than a second number threshold, and controlling the refrigerant storage tank to release or recover the refrigerant according to the judgment result and the comparison result of the system high pressure or the system low pressure of the multi-split air conditioner and the preset threshold.
10. The refrigerant control method as claimed in claim 9, wherein the first number threshold is in a range from 0.75 x total number of multi-split air conditioner indoor units to 0.85 x total number of multi-split air conditioner indoor units; and/or
The second quantity threshold value ranges from 0.55 to 0.65 of the total number of the multiple air-conditioner indoor units.
11. The refrigerant control method as claimed in claim 9, wherein the step S2 of comparing a tank pressure of the refrigerant storage tank with a system high pressure of the multi-split air conditioner and determining whether to stop releasing the refrigerant according to the comparison result includes:
if the pressure in the refrigerant liquid storage tank is less than or equal to the system high pressure of the multi-split air conditioner, controlling the refrigerant liquid storage tank to stop releasing the refrigerant;
and if the pressure in the refrigerant storage tank is higher than the system high pressure of the multi-split air conditioner, controlling the refrigerant storage tank to continuously release the refrigerant.
12. The refrigerant control method as claimed in claim 9, wherein the step S3 includes:
s301, if the running number of the inner machines of the multi-split air conditioner system is smaller than a second number threshold value, and the total number of the inner machines of the multi-split air conditioner is not less than a, comparing whether the system high pressure of the multi-split air conditioner is larger than a first preset high pressure threshold value or not, and if the system high pressure of the multi-split air conditioner is larger than the first preset high pressure threshold value as a comparison result, controlling a refrigerant storage tank to recover a refrigerant, wherein a is 3-5;
and S302, if the running number of the internal machines of the multi-split air conditioner system is greater than or equal to a second number threshold and smaller than a first number threshold, comparing whether the system low pressure of the multi-split air conditioner is smaller than a first preset low pressure threshold, and if the comparison result shows that the system high pressure of the multi-split air conditioner is greater than the first preset low pressure threshold, controlling a refrigerant storage tank to release the refrigerant.
13. The refrigerant control method according to claim 12, wherein the step S301 further includes:
after the refrigerant storage tank is controlled to recover the refrigerant, comparing whether the system high pressure of the multi-split air conditioner is less than or equal to a second preset high pressure threshold value or not, if the system high pressure of the multi-split air conditioner is less than or equal to the second preset high pressure threshold value, controlling the refrigerant storage tank to stop recovering the refrigerant, otherwise, continuously controlling the refrigerant storage tank to recover the refrigerant; and/or
The step S302 further includes:
and after the refrigerant storage tank is controlled to release the refrigerant, comparing whether the system high pressure of the multi-split air conditioner is less than or equal to a second preset low pressure threshold value, if the system high pressure of the multi-split air conditioner is greater than or equal to the second preset low pressure threshold value, controlling the refrigerant storage tank to stop releasing the refrigerant, otherwise, continuously controlling the refrigerant storage tank to release the refrigerant.
14. The refrigerant control method as claimed in claim 13, wherein the first predetermined high pressure threshold is 3.85 to 3.95Mpa, and the second predetermined high pressure threshold is 3.65 to 3.75 Mpa; and/or
The first preset low-pressure threshold value is 0.65-0.85 Mpa, and the second preset low-pressure threshold value is 0.85-0.95 Mpa.
15. The refrigerant control method according to claim 12, wherein the step S301 further includes:
after the system high pressure of the multi-split air conditioner is compared with a first preset high pressure threshold value, if the comparison result shows that the system high pressure of the multi-split air conditioner is smaller than or equal to the first preset high pressure threshold value, the current state of the refrigerant liquid storage tank is kept, and the system normally operates; and/or
The step S302 further includes:
and after the comparison result shows that the system high pressure of the multi-split air conditioner is greater than or equal to the first preset low pressure threshold value, the current state of the refrigerant liquid storage tank is kept and the system normally operates.
16. The refrigerant control method as claimed in claim 9, wherein the method for releasing the refrigerant from the refrigerant reservoir comprises:
controlling to open the fifth electromagnetic valve, the third electromagnetic valve and the first throttling element, enabling a high-temperature and high-pressure refrigerant flowing out of the exhaust port of the compressor to pass through a refrigerant heat exchange tube of the refrigerant liquid storage tank, and heating the refrigerant in the refrigerant containing part by the refrigerant heat exchange tube; and when the pressure in the tank is increased to be higher than the system low pressure of the multi-split air conditioner, the second electromagnetic valve is opened, and the refrigerant is released.
17. The refrigerant control method as claimed in claim 9, wherein the method for recovering the refrigerant from the refrigerant reservoir comprises:
opening the third electromagnetic valve, the fourth electromagnetic valve and the first throttling element, allowing the medium-temperature high-pressure refrigerant flowing out of the outlet of the outdoor heat exchanger to enter a refrigerant heat exchange tube of the refrigerant liquid storage tank after being throttled by the first throttling element, and cooling the refrigerant in the refrigerant containing part by the refrigerant heat exchange tube; and when the pressure in the tank is reduced to be lower than the system high pressure of the multi-split air conditioner, the first electromagnetic valve is opened, and the refrigerant is recovered.
18. The refrigerant control method according to claim 17, wherein after the refrigerant recovery is completed, when a tank pressure of the refrigerant storage tank is higher than a system high pressure of the multi-split air conditioner, or a tank temperature of the refrigerant storage tank is higher than a system high pressure corresponding saturation temperature + b of the multi-split air conditioner, where b is 1 to 3 ℃, the third solenoid valve, the fourth solenoid valve and the first throttling element are opened, the medium-temperature high-pressure refrigerant flowing out of an outlet of the outdoor heat exchanger is throttled by the first throttling element and enters the refrigerant heat exchange tube, and the refrigerant heat exchange tube cools the refrigerant in the refrigerant accommodating portion.
19. The refrigerant control method as claimed in claim 9, further comprising:
and S4, when the multi-split air conditioner is shut down, closing the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve and the first throttling element of the electromagnetic valves.
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| CN201911237939.9A CN111306851A (en) | 2019-12-05 | 2019-12-05 | Refrigerant storage tank, multi-split air conditioner and refrigerant control method |
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| CN201911237939.9A CN111306851A (en) | 2019-12-05 | 2019-12-05 | Refrigerant storage tank, multi-split air conditioner and refrigerant control method |
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