CN115899851A - Outdoor unit of water source multi-split air conditioner, water source multi-split air conditioner system and control method of water source multi-split air conditioner system - Google Patents
Outdoor unit of water source multi-split air conditioner, water source multi-split air conditioner system and control method of water source multi-split air conditioner system Download PDFInfo
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- 239000007788 liquid Substances 0.000 claims abstract description 68
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Abstract
The invention relates to an outdoor unit of a water source multi-split air conditioner, a water source multi-split air conditioner system and a control method of the water source multi-split air conditioner system, and belongs to the technical field of water source multi-split air conditioners. The outdoor unit comprises a liquid storage tank; the subcooler is communicated with the liquid storage tank through a first pipeline, and a first valve is arranged on the first pipeline; the heat exchanger is communicated with the liquid storage tank through a second pipeline, and a second valve is arranged on the second pipeline; the gas-liquid separator is communicated with the liquid storage tank through a third pipeline, and a third valve is arranged on the third pipeline. When a certain outdoor unit is shut down, the first valve is closed, so that the backflow prevention effect is achieved, when the outdoor unit is started and heats, the opening degree of the second valve is adjusted according to the suction superheat degree, so that the refrigerant flowing back to the heat exchanger during heating is mainly liquid refrigerant, and when the outdoor unit is shut down and the pressure of the high-pressure side is overhigh, the third valve is opened, so that the liquid storage tank and the high-pressure side are decompressed by the third pipeline, and the probability that the outdoor unit cannot be restarted due to overhigh pressure is reduced.
Description
Technical Field
The invention belongs to the technical field of water source multi-split air conditioners, and particularly relates to an outdoor unit of a water source multi-split air conditioner, a water source multi-split air conditioner system and a control method of the water source multi-split air conditioner system.
Background
The water source multi-connected air conditioner has incomparable advantages of high energy efficiency, small occupied area, good economic return rate and the like, particularly the economic return rate, compared with the air source multi-connected air conditioner, the total cost (initial investment plus operation cost) of the water source multi-connected air conditioner is lower than that of the air source multi-connected air conditioner after the air source multi-connected air conditioner operates for about 1.5 years, and based on the characteristic, the market share of the current water source multi-connected air conditioner is increased year by year.
The existing water source multi-split air conditioner is shown in fig. 1, and comprises an indoor unit 1 and a plurality of outdoor units 2, wherein the outdoor units 2 are provided with a compressor 3, an oil separator 4, a heat exchanger 5, a subcooler 6 and a gas-liquid separator 7, and the capacity of the heat exchanger 3 is generally small. Therefore, when the unit with larger cooling capacity is used, the liquid storage tank 8 is usually configured in the outdoor unit 1 due to more refrigerant filling amount, so as to assist the outdoor unit 2 to store more refrigerant, the liquid storage tank 8 is communicated and arranged between the subcooler 6 and the heat exchanger 3, and the subcooler 6 is directly communicated with the indoor unit 1 through a pipeline. When one outdoor unit 2 of the water source multi-split air conditioner is shut down, the refrigerant in the indoor unit 1 flows back into the liquid storage tank 8 through the pipeline and the subcooler 6, so that the refrigerant in the indoor unit 1 is lost, and the comfort and reliability of the unit are poor. In order to solve the technical problem, in the prior art, a backflow preventing component 9 is additionally arranged on a pipeline connecting the subcooler 6 and the indoor unit 1 so as to prevent refrigerant in the indoor unit 1 from flowing backwards into a liquid storage tank 8 of the shut-down outdoor unit 2 when one outdoor unit 2 is shut down. However, the backflow prevention assembly used on the existing outdoor unit has the defects of complex structure, more components, large occupied space in the outdoor unit and influence on the layout of pipelines.
Disclosure of Invention
The invention provides an outdoor unit of a water source multi-split air conditioner, a water source multi-split air conditioner system and a control method thereof, which are used for solving the technical problems that an anti-backflow component used on the conventional outdoor unit has a complex structure, many components and large occupied space in the outdoor unit and influences the layout of pipelines.
The invention is realized by the following technical scheme: an outdoor unit of a water source multi-split air conditioner, comprising:
a liquid storage tank;
the subcooler is communicated with the liquid storage tank through a first pipeline, and a first valve is arranged on the first pipeline;
and the heat exchanger is communicated with the liquid storage tank through a second pipeline, and a second valve is arranged on the second pipeline.
Further, in order to better implement the present invention, the method further includes:
and the gas-liquid separator is communicated with the liquid storage tank through a third pipeline, and a third valve is arranged on the third pipeline.
A water source multi-split system comprises an indoor unit and at least two outdoor units, wherein the outdoor units are communicated with the indoor unit.
The control method of the water source multi-split system is characterized by comprising the following steps:
acquiring the opening and closing state of the outdoor unit;
and controlling the opening and closing of the first valve and the second valve according to the opening and closing state of the outdoor unit.
Further, in order to better implement the present invention, the controlling the opening and closing of the first valve and the second valve according to the opening and closing state of the outdoor unit specifically includes:
if the outdoor unit is in a shutdown state, closing the first valve, and completely opening the second valve;
and if the outdoor unit is in a starting state, acquiring the operation mode of the outdoor unit, and controlling the working states of the first valve and the second valve according to the operation mode of the outdoor unit.
Further, in order to better implement the present invention, the controlling the opening and closing of the first valve and the second valve according to the operation mode of the outdoor unit specifically includes:
if the outdoor unit is in a refrigeration mode, completely opening both the first valve and the second valve;
fully opening the first valve and adjusting an opening degree of the second valve according to an actual suction superheat and a target suction superheat if the outdoor unit is in a heating mode, wherein:
the actual suction superheat degree is the difference value of the sensing temperature of the gas-liquid separator and the saturation temperature corresponding to the evaporation pressure;
the target suction superheat degree is determined according to the magnitude relation between the exhaust superheat degree and a preset superheat degree;
the exhaust superheat degree is the difference between the exhaust temperature and the saturation temperature corresponding to the condensing pressure of the outdoor unit.
Further, in order to better implement the present invention, the target degree of superheat of intake air is determined according to a magnitude relationship between the degree of superheat of exhaust air and a preset degree of superheat, specifically:
in a first preset time, if the discharge superheat degree of the outdoor unit is greater than or equal to the preset superheat degree, determining the target suction superheat degree as a first value;
and in a first preset time, if the discharge superheat degree of the outdoor unit is less than the preset superheat degree, determining the target suction superheat degree to be a second numerical value.
Further, in order to better implement the present invention, the adjusting the opening degree of the second valve by the actual suction superheat and the target suction superheat comprises:
comparing the magnitude relation between the actual suction superheat degree and the target suction superheat degree;
and adjusting the opening degree of the second valve according to the magnitude relation between the actual suction superheat degree and the target suction superheat degree.
Further, in order to better implement the present invention, the adjusting the opening degree of the second valve according to the magnitude relation between the actual suction superheat degree and the target suction superheat degree specifically comprises:
if the actual suction superheat degree is larger than the target suction superheat degree, the opening degree of the second valve is increased;
if the actual suction superheat degree is smaller than the target suction superheat degree, the opening degree of the second valve is reduced;
and if the actual suction superheat is equal to the target suction superheat, maintaining the opening degree of the second valve.
Further, in order to better implement the present invention, if the actual degree of superheat of intake air is greater than the target degree of superheat of intake air, the method for increasing the opening degree of the second valve specifically comprises:
judging whether the actual air suction superheat degree is continuously larger than the target air suction superheat degree within a second preset time;
if the actual air suction superheat degree is continuously larger than the target air suction superheat degree within a second preset time, delaying time T, and then increasing the opening degree of the second valve from the current opening degree to an upstream opening degree, wherein the current opening degree is S, the upstream opening degree is X, the actual air suction superheat degree is A, the target air suction superheat degree is B, and X = S + K 1 ×(A-B)，K 1 ＝12。
Further, in order to better implement the present invention, if the actual suction superheat is smaller than the target suction superheat, the specific method for adjusting the opening of the second valve is as follows:
judging whether the actual suction superheat degree is continuously smaller than the target suction superheat degree within a second preset time;
if the actual air suction superheat degree is continuously smaller than the target air suction superheat degree within a second preset time, delaying the time T, and then reducing the opening degree of the second valve from the current opening degree to a downlink opening degree, wherein the current opening degree is S, the downlink opening degree is Z, the actual air suction superheat degree is A, the target air suction superheat degree is B, and Z = S-K 2 ×(A-B)，K 2 ＝6。
Further, in order to better implement the present invention, the outdoor unit in the water source multiple on-line system is the above-mentioned outdoor unit;
the control method comprises the following steps;
and controlling the opening and closing of the third valve according to the opening and closing state of the outdoor unit.
Further, in order to better implement the present invention, the controlling of the opening and closing of the third valve according to the opening and closing state of the outdoor unit includes:
when the outdoor unit is opened, the third valve is closed;
when the outdoor unit is shut down, the opening and closing of the third valve of the outdoor unit are controlled according to the magnitude relation between the saturation temperature corresponding to the condensation pressure of the outdoor unit and a first preset temperature and a second preset temperature, wherein the first preset temperature is higher than the second preset temperature.
Further, in order to better implement the present invention, the controlling of opening and closing the third valve of the outdoor unit according to a magnitude relationship between a saturation temperature corresponding to the condensing pressure of the outdoor unit and the first preset temperature and the second preset temperature specifically includes:
in a third preset time, if the condensation pressure of the outdoor unit is higher than the saturation temperature corresponding to the first preset temperature, opening the third valve;
within a third preset time, if the condensation pressure of the outdoor unit is lower than the saturation temperature corresponding to the second preset temperature, closing the third valve;
and in a third preset time, if the condensation pressure of the outdoor unit is higher than the saturation temperature corresponding to the second preset temperature and lower than the first preset temperature, keeping the opening and closing state of the third valve.
Compared with the prior art, the invention has the following beneficial effects:
(1) The outdoor unit of the water source multi-split air conditioner provided by the invention has the advantages that the first valve is additionally arranged on the first pipeline which is communicated with the subcooler and the liquid storage tank, the second valve is arranged on the second pipeline which is communicated with the heat exchanger and the liquid storage tank, when the outdoor unit is stopped, the first valve is closed, the first pipeline can be cut off, so that the refrigerant in the indoor unit is prevented from flowing backwards into the liquid storage tank, the first valve is utilized to replace a backflow preventing component used in the outdoor unit of the water source multi-split air conditioner in the prior art, the backflow preventing function can be realized only by additionally arranging the first valve on the first pipeline, the unit structure is simpler, fewer used components are needed, the space occupied by the first valve in the outdoor unit is smaller, and the pipeline layout is more facilitated.
(2) The water source multi-split air conditioner system provided by the invention adopts the outdoor unit, so that the water source multi-split air conditioner system is simpler in structure, fewer in used components, smaller in space occupied by the first valve in the outdoor unit and more beneficial to pipeline layout.
(3) The control method of the water source multi-split air conditioner system provided by the invention has the advantages that when a certain outdoor unit is shut down, the first valve is closed and the second valve is completely opened, so that the refrigerant of the indoor unit can not flow backwards into the liquid storage tank of the outdoor unit in the shutdown state of the certain outdoor unit, the control method is simple, when the outdoor unit is started, the first valve is opened, the working state of the second valve is controlled through the operation mode of the outdoor unit, specifically, the second valve is completely opened in the cooling mode, and in the heating mode, the opening degree of the second valve is adjusted according to the size relation between the actual suction superheat degree and the target suction superheat degree, so that the opening degree of the second valve is more reasonable, the better throttling effect is achieved, the refrigerant flowing back from the liquid storage tank to the heat exchanger during heating is mainly liquid refrigerant, and the throttling effect of the second valve on the refrigerant is better by means of the control method.
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 diagram of an outdoor unit of a prior art water source multi-split air conditioning system;
FIG. 2 is a schematic diagram of a prior art water supply multiple on-line system;
fig. 3 is a schematic diagram of an outdoor unit of a water source multi-split air conditioning system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a water supply multiple online system provided by an embodiment of the invention;
fig. 5 is a flowchart of a control method of a water source multi-split system according to an embodiment of the present invention.
In the figure:
1-an indoor unit; 2, an outdoor unit; 3-a compressor; 4-an oil separator; 5-a heat exchanger; 6-a subcooler; 7-gas-liquid separator; 8-a liquid storage tank; 9-a backflow prevention component; a 10-four-way valve; 11-heating electronic expansion valve; 12-a first conduit; 13-a first valve; 14-a second conduit; 15-a second valve; 16-a third line; 17-third valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the outdoor unit 2 of the water source multi-split air conditioner provided by the embodiment comprises a liquid storage tank 8, a subcooler 6 and a heat exchanger 5. The subcooler 6 is communicated with the liquid storage tank 8 through a first pipeline 12, a first valve 13 is arranged on the first pipeline 12, the first valve 13 is used for controlling the on-off of the first pipeline 12, and optionally, the first valve 13 is a large-caliber electronic expansion valve. The heat exchanger 5 is communicated with the liquid storage tank 8 through a second pipeline 14, a second valve 15 is arranged on the second pipeline 14, the second valve 15 is used for controlling the on-off of the second pipeline 14, and optionally, the second valve 15 is also a large-caliber electronic expansion valve.
Of course, the outdoor unit 2 of the water source multi-split air conditioner provided in this embodiment further includes components such as a compressor 3, an oil separator 4, a four-way valve 10, and a gas-liquid separator 7, and since the connection relationship among the components and the components in the outdoor unit 2 provided in this embodiment are the same as those in the prior art, detailed description thereof is omitted here.
The outdoor unit 2 of the water source multi-connected unit provided by the embodiment is characterized in that the first valve 13 is additionally arranged on the first pipeline 12 which is communicated with the subcooler 6 and the liquid storage tank 8, the second valve 15 is arranged on the second pipeline 14 which is communicated with the heat exchanger 5 and the liquid storage tank 8, when the outdoor unit 2 is stopped, the first pipeline 12 can be cut off by closing the first valve 13, so that the refrigerant in the indoor unit 1 is prevented from flowing backwards into the liquid storage tank 8, the first valve 13 is utilized to replace the backflow-preventing component 9 used in the outdoor unit 9 of the water source multi-connected unit in the prior art, and the backflow-preventing effect can be realized by only additionally arranging the first valve 13 on the first pipeline 12, so that the unit structure is simpler, fewer components are used, the space occupied by the first valve 13 in the outdoor unit 2 is smaller, and the pipeline layout is more facilitated.
Example 2:
the outdoor unit 2 of the water source multi-split air conditioner of the present embodiment is substantially the same as the outdoor unit 2 of embodiment 1, except that:
the receiver 8 and the gas-liquid separator 7 in the outdoor unit 2 are connected to each other by a third pipe line 16, and a third valve 17 is provided in the third pipe line 16, and the third valve 17 controls opening and closing of the third pipe line 16. Optionally, the third conduit 16 is connected to the bottom of the tank 8. Optionally, the third valve 17 is a solenoid valve adapted for high pressure regulation.
When the first valve 13 is closed, the oil pressure in the system formed by connecting the liquid storage tank 8, the heat exchanger 5, the four-way valve 10, the oil separator 4 and the compressor 3 is high pressure, defined as a high pressure side, although the outdoor unit 2 of the water source multi-split air conditioner is generally present in the machine room, the temperature of the machine room is too high due to specific conditions, such as the sun directly shines on the machine room and the machine room is sealed without air exchange and the like; or when the water inlet temperature of the unit is abnormal, if the water inlet temperature is higher than or equal to 60 ℃, the high-pressure side pressure of the shutdown unit is abnormally increased, because the first valve 13 is closed, and a pipeline consisting of the liquid storage tank 8, the second valve 15, the heat exchanger 5 and the four-way valve 10 is a high-pressure dead zone during shutdown, the pipeline at the section can have the condition that the pressure is abnormally increased along with the outer ring temperature or the water inlet temperature, so that the refrigerant is continuously accumulated, and finally the high-pressure side pressure is overhigh, once the unit is shutdown, the compressor 3 at the high-pressure side cannot be started, and further the shutdown (or shutdown protection of the system) of the whole unit is caused, and finally the abnormal fluctuation of the comfort is influenced.
The liquid storage tank 8 is communicated with the gas-liquid separator 7 in the outdoor unit 2 by virtue of a third pipeline 16, the third valve 17 is arranged on the third pipeline 16, and when the system detects that the temperature of the high-pressure side of the outdoor unit 2 which is shut down is higher than a preset value, the system controls the third valve 17 to be opened, so that the high-pressure refrigerant in the liquid storage tank 8 is discharged into the gas-liquid separator 7, the high-pressure side is further discharged, and the probability that the outdoor unit 2 cannot be restarted after being shut down is reduced.
Example 3:
the present embodiment provides a water source multiple on-line system, which includes an indoor unit 1 and at least two outdoor units 2 in embodiment 1 or embodiment 2, where the outdoor units 2 are communicated with the indoor units 1. The outdoor unit 2 in embodiment 1 or embodiment 2 is adopted in the water source multiple online system, so that the structure of the water source multiple online system is simpler and more reasonable, and the probability that the outdoor unit 2 cannot be restarted after being stopped is lower.
Example 4:
the present embodiment provides a control method of the water source multiple on-line system, including:
the open/close state of a certain outdoor unit 2 is acquired. It should be noted that the method for acquiring the open/close state of the outdoor unit 2 is the same as that in the prior art, and therefore, detailed description thereof is omitted here.
The opening and closing of the first valve 13 and the second valve 15 are controlled according to the opening and closing state of the outdoor unit 2.
Optionally, if the outdoor unit 2 is in a shutdown state, the first valve 13 is closed and the second valve 15 is fully opened, so that in the shutdown state, the first valve 13 is used to cut off the connection pipeline between the subcooler 6 and the liquid storage tank 8, thereby preventing the refrigerant in the indoor unit 1 from flowing back into the liquid storage tank 8, and the second valve 15 fully conducts the second pipeline 14, thereby enabling the high-pressure side in the outdoor unit 2 to maintain a passage state, and thus ensuring that the volume of the high-pressure side is as large as possible.
If the outdoor unit 2 is in the on state, the operation mode of the outdoor unit 2 is obtained, and the operation states of the first valve 13 and the second valve 15 are controlled according to the operation mode. It should be noted that the method for acquiring the operation mode of the outdoor unit 2 is the same as the prior art, and therefore, detailed description thereof is omitted here.
Specifically, if the outdoor unit 2 is in the cooling mode, the first valve 13 and the second valve 15 are both fully opened, the refrigerant after coming out of the compressor 3 sequentially passes through the oil separator 4 and the four-way valve 10 and then reaches the heat exchanger 5, then flows into the second pipeline 14 after being subjected to heat exchange by the heat exchanger 5, the second valve 15 on the second pipeline 14 is fully opened, so that the refrigerant is smoothly guided into the liquid storage tank 8, the refrigerant in the liquid storage tank 8 flows into the first pipeline 12, the second valve 15 on the first pipeline 12 is fully opened, so that the refrigerant is smoothly guided into the subcooler 6, the refrigerant after coming out of the subcooler 6 is guided into the indoor unit 1 through the pipeline, and then the refrigerant in the indoor unit 1 after being subjected to heat exchange flows back to the gas-liquid separator 7 for gas-liquid separation, and the gas-liquid separated refrigerant flows into the compressor 3 again to circulate.
If the outdoor unit 2 is in the heating mode, the first valve 13 is fully opened, and the opening degree of the second valve 15 is adjusted according to the actual suction superheat and the target suction superheat. In the heating mode, the refrigerant is directly fed into the indoor unit 1 through the compressor 3, then flows into the subcooler 6 from the indoor unit 1 through a pipeline, then flows into the liquid storage tank 8 through the first pipeline 12, and the first valve 13 is completely opened, so that the refrigerant can smoothly enter the liquid storage tank 8, the refrigerant coming out of the liquid storage tank 8 enters the heat exchanger 5 through the second pipeline 14, and the refrigerant is guided into the compressor 3 through the heat exchanger 5 to circulate. The second valve 15 disposed on the second pipeline 14 throttles and depressurizes the refrigerant in the second pipeline 14 to ensure that the refrigerant flowing through the heat exchanger 5 is mainly liquid refrigerant. Based on this, the control method of the second valve 15 described above is particularly important.
In the prior art, although the heating electronic expansion valve 11 is also provided on the second pipeline 14, the control method of the heating electronic expansion valve 11 on the second pipeline 14 has defects, so that the throttling effect of the heating electronic expansion valve 11 on the second pipeline 14 is poor, and the refrigerant flowing back to the heat exchanger 5 is not mainly liquid refrigerant.
In the control method provided in this embodiment, the opening degree of the second valve 15 is adjusted according to the suction superheat (i.e., the actual suction superheat and the target suction superheat), so that the second valve 15 can better throttle the refrigerant flowing through the second pipeline 14 during heating, and it is ensured that the refrigerant flowing back to the heat exchanger 5 through the second pipeline 14 during heating is mainly liquid refrigerant.
The method of acquiring the actual degree of superheat of intake air is as follows:
the sensed temperature of the gas-liquid separator 7 is obtained through a detector;
then, the actual suction superheat is obtained by subtracting the saturation temperature corresponding to the evaporation pressure of the outdoor unit 2 from the temperature sensing value of the gas-liquid separator 7.
The method for acquiring the target suction superheat degree comprises the following steps:
acquiring the exhaust temperature of the outdoor unit 2 through a detector;
subtracting the saturation temperature corresponding to the condensing pressure of the outdoor unit 2 from the discharge temperature of the outdoor unit 2 to obtain the discharge superheat degree of the outdoor unit 2;
and then determining the target suction superheat degree according to the magnitude relation between the obtained exhaust superheat degree and the preset superheat degree.
Alternatively, in the embodiment, the specific manner of determining the target suction superheat degree according to the magnitude relationship between the obtained exhaust superheat degree and the preset superheat degree is as follows:
in a first preset time, if the discharge superheat degree of the outdoor unit 2 is greater than or equal to a preset superheat degree, the target suction superheat degree is determined to be a first value. And in the first preset time, if the discharge superheat degree of the outdoor unit 2 is less than the preset superheat degree, determining the target suction superheat degree as a second numerical value.
For example, the first predetermined time is 10 seconds, and the predetermined superheat degree is 25 ℃. That is, the discharge superheat of the outdoor unit 2 is 25 ℃ or more for 10 consecutive seconds, and the target suction superheat is 3 ℃. In 10 consecutive seconds, the discharge superheat of the outdoor unit 2 is less than 25 ℃, and the target suction superheat is 2 ℃.
Alternatively, in the present embodiment, the above-mentioned adjusting the opening degree of the second valve 15 according to the actual suction superheat and the target suction superheat includes the steps of: step 1, comparing the magnitude relation between the actual air suction superheat degree and the target air suction superheat degree; step 2 is to adjust the opening degree of the second valve 15 according to the magnitude relation between the actual suction superheat and the target suction superheat.
The specific implementation method of the step 2 comprises the following steps:
if the actual intake air superheat is larger than the target intake air superheat, the opening degree of the second valve 15 is increased. In this embodiment, the method for increasing the opening degree of the second valve 15 first determines whether the actual air suction superheat degree is continuously greater than the target air suction superheat degree within a second preset time, and if the actual air suction superheat degree is continuously greater than the target air suction superheat degree within the second preset time, the time delay T is performed, and then the opening degree of the second valve 15 is increased from the current opening degree to the upstream opening degreeWherein, the current opening is defined as S, the ascending opening is defined as X, the actual air suction superheat degree is defined as A, the target air suction superheat degree is defined as B, and X = S + K 1 ×(A-B)，K 1 =12. It is to be understood that if the actual suction superheat is not continuously greater than the target suction superheat for the second predetermined time, the current opening degree of the second valve 15 is maintained.
If the actual intake air superheat is smaller than the target intake air superheat, the opening degree of the second valve 15 is decreased. In this embodiment, the method for decreasing the opening degree of the third valve 17 is to first determine whether the actual suction superheat degree is continuously less than the target suction superheat degree within a second preset time, and if the actual suction superheat degree is continuously less than the target suction superheat degree within the second preset time, delay the time T, and then decrease the opening degree of the second valve 15 from the current opening degree to a downstream opening degree, where the current opening degree is S, the downstream opening degree is Z, the actual suction superheat degree is a, the target suction superheat degree is B, and Z = S-K 2 ×(A-B)，K 2 And (6). It is to be understood that if the actual suction superheat does not continue to be less than the target suction superheat for the second predetermined time, the current opening degree of the second valve 15 is maintained.
If the actual intake superheat is equal to the target intake superheat, the current opening degree of the second valve 15 is maintained.
For example, the second preset time is 5 seconds, and the delay time T is 40 seconds. That is, if the actual intake air superheat is continuously larger than the target intake air superheat within 5 seconds, the opening degree of the second valve 15 is increased by the upward opening degree after delaying for 40 seconds. If the actual intake air superheat continues to be lower than the target intake air superheat within 5 seconds, the opening degree of the second valve 15 is adjusted to be smaller than the downstream opening degree after a delay of 40 seconds.
By the above method, the degree of opening of the second valve 15 on the second pipeline 14 when the outdoor unit 2 heats is controlled by the suction superheat degree, so that the throttling accuracy of the second valve 15 on the refrigerant in the second pipeline 14 is more accurately and effectively controlled, and the refrigerant flowing back to the heat exchanger 5 through the second pipeline 14 during heating is ensured to be mainly liquid refrigerant. The first valve 13 and the second valve 15 are fully opened when the outdoor unit 2 performs cooling, the first valve 13 is fully opened when the outdoor unit 2 performs heating, and the opening degree of the second valve 15 is changed according to the suction superheat degree, and since the flow direction of the refrigerant is reversed during cooling and heating, the refrigerant flow of the outdoor unit 2 can be bidirectionally adjusted by the above-mentioned structure and method.
Example 5:
the present embodiment also provides a control method of the water source multiple on-line system, which is an improvement of the control method provided in embodiment 4, and the difference between the control method and embodiment 4 is as follows:
the outdoor unit 2 of the water source multi-split air conditioning system in this embodiment is the outdoor unit 2 of embodiment 2. The control method provided in this embodiment is to control the opening of the third valve 17 according to the open/close state of the outdoor unit 2, and the specific manner is as follows:
when the outdoor unit 2 is opened, the third valve 17 is closed, and the third pipe 16 connecting the gas-liquid separator 7 and the liquid outlet pipe is disconnected, so that the refrigerant in the liquid storage tank 8 does not leak into the gas-liquid separator 7 regardless of the operation mode of the outdoor unit 2.
When the outdoor unit 2 is turned off, the third valve 17 of the outdoor unit 2 is controlled to open or close according to the magnitude relationship between the saturation temperature corresponding to the condensing pressure of the outdoor unit 2 and the first preset temperature and the second preset temperature, wherein the first preset temperature is higher than the second preset temperature. Specifically, in a third preset time, if the condensing pressure of the outdoor unit 2 corresponds to a saturated temperature greater than the first preset temperature, the third valve 17 is opened; within a third preset time, if the condensing pressure of the outdoor unit 2 is lower than the saturation temperature corresponding to the second preset temperature, closing the third valve 17; and in a third preset time, if the condensation pressure of the outdoor unit 2 is higher than the second preset temperature and lower than the first preset temperature corresponding to the saturation temperature, keeping the open/close state of the third valve 17.
By the control method, the third valve 17 is opened when the temperature of the refrigerant in the high-pressure side pipeline of the outdoor unit 2 reaches the first preset temperature, so that the phenomenon that the pressure of the refrigerant in the high-pressure side pipeline of the outdoor unit 2 is too high due to too high temperature is avoided, at the moment, the refrigerant in the liquid storage tank 8 flows into the gas-liquid separator 7, so that the pressure of the refrigerant in the high-pressure side pipeline of the outdoor unit 2 is relieved, the pressure of the refrigerant in the high-pressure side pipeline is reduced along with the relief, and the third valve 17 is closed when the temperature of the refrigerant in the high-pressure side pipeline of the outdoor unit 2 is lowered to the second preset temperature. As can be seen from the above, the temperature of the refrigerant in the high-pressure side pipeline of the outdoor unit 2 is lower than the second preset temperature and higher than the first preset temperature, and the pressure of the refrigerant in the high-pressure side pipeline is in a normal state.
For example, the first preset temperature is 58 ℃, the second preset temperature is 40 ℃, and the third preset time is 10 seconds. That is, if the condensing pressure of the outdoor unit 2 is higher than 58 ℃ corresponding to the saturation temperature within 10 seconds, the third valve 17 is opened; within 10 seconds, if the condensing pressure of the outdoor unit 2 is lower than 40 ℃ corresponding to the saturation temperature, closing the third valve 17; in 10, if the condensing pressure of the outdoor unit 2 is higher than 40 ℃ and lower than 58 ℃ corresponding to the saturation temperature, the open/close state of the third valve 17 is maintained. When the outdoor unit 2 is turned on, the third valve 17 is closed.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (14)
1. An outdoor unit of a water source multi-connected air conditioner, comprising:
a liquid storage tank;
the subcooler is communicated with the liquid storage tank through a first pipeline, and a first valve is arranged on the first pipeline;
and the heat exchanger is communicated with the liquid storage tank through a second pipeline, and a second valve is arranged on the second pipeline.
2. The outdoor unit of a water source multi-split air conditioner according to claim 1, further comprising:
and the gas-liquid separator is communicated with the liquid storage tank through a third pipeline, and a third valve is arranged on the third pipeline.
3. The utility model provides a water source multi-online system which characterized in that: comprising an indoor unit and at least two outdoor units according to claim 1 or 2, said outdoor units being in communication with said indoor units.
4. A method for controlling a water supply multiple on-line system according to claim 3, wherein:
acquiring the opening and closing state of the outdoor unit;
and controlling the opening and closing of the first valve and the second valve according to the opening and closing state of the outdoor unit.
5. The method as claimed in claim 4, wherein the controlling the opening and closing of the first valve and the second valve according to the opening and closing state of the outdoor unit comprises:
if the outdoor unit is in a shutdown state, closing the first valve, and completely opening the second valve;
and if the outdoor unit is in a starting state, acquiring the operation mode of the outdoor unit, and controlling the working states of the first valve and the second valve according to the operation mode of the outdoor unit.
6. The method as claimed in claim 5, wherein the controlling of the opening and closing of the first valve and the second valve according to the operation mode of the outdoor unit comprises:
if the outdoor unit is in a refrigeration mode, completely opening both the first valve and the second valve;
fully opening the first valve and adjusting an opening degree of the second valve according to an actual suction superheat and a target suction superheat if the outdoor unit is in a heating mode, wherein:
the actual suction superheat degree is the difference value between the sensing temperature of the gas-liquid separator and the saturation temperature corresponding to the evaporation pressure of the outdoor unit;
the target suction superheat degree is determined according to the size relation between the exhaust superheat degree and a preset superheat degree;
the exhaust superheat degree is the difference between the exhaust temperature and the saturation temperature corresponding to the condensing pressure of the outdoor unit.
7. The control method of the water source multi-split air-conditioning system as recited in claim 6, wherein the target suction superheat degree is determined according to a magnitude relation between a discharge superheat degree and a preset superheat degree, and specifically comprises the following steps:
in a first preset time, if the discharge superheat degree of the outdoor unit is greater than or equal to the preset superheat degree, determining the target suction superheat degree as a first value;
and in a first preset time, if the discharge superheat degree of the outdoor unit is less than the preset superheat degree, determining the target suction superheat degree to be a second numerical value.
8. The method as claimed in claim 7, wherein the adjusting the opening degree of the second valve by the actual suction superheat and the target suction superheat comprises:
comparing the magnitude relation between the actual suction superheat degree and the target suction superheat degree;
and adjusting the opening degree of the second valve according to the magnitude relation between the actual suction superheat degree and the target suction superheat degree.
9. The method as claimed in claim 8, wherein the adjusting the opening degree of the second valve according to the relationship between the actual suction superheat and the target suction superheat is implemented by:
if the actual suction superheat degree is larger than the target suction superheat degree, the opening degree of the second valve is increased;
if the actual suction superheat degree is smaller than the target suction superheat degree, the opening degree of the second valve is reduced;
and if the actual suction superheat is equal to the target suction superheat, maintaining the opening degree of the second valve.
10. The method as claimed in claim 9, wherein the control unit is further configured to control the water source multi-split system,
if the actual suction superheat is larger than the target suction superheat, the method for increasing the opening degree of the second valve specifically comprises the following steps:
judging whether the actual air suction superheat degree is continuously larger than the target air suction superheat degree within a second preset time;
if the actual air suction superheat degree is continuously larger than the target air suction superheat degree within a second preset time, delaying time T, and then increasing the opening degree of the second valve from the current opening degree to an upstream opening degree, wherein the current opening degree is S, the upstream opening degree is X, the actual air suction superheat degree is A, the target air suction superheat degree is B, and X = S + K 1 ×(A-B)，K 1 ＝12。
11. The method as claimed in claim 9, wherein the control unit is further configured to control the water source multi-split system,
if the actual suction superheat degree is smaller than the target suction superheat degree, the specific method for adjusting the opening degree of the second valve is as follows:
judging whether the actual air suction superheat degree is continuously smaller than the target air suction superheat degree within a second preset time;
if the actual air suction superheat degree is continuously smaller than the target air suction superheat degree within second preset time, delaying time T, and then reducing the opening degree of the second valve from the current opening degree to a downlink opening degree, wherein the current opening degree is S, the downlink opening degree is Z, the actual air suction superheat degree is A, the target air suction superheat degree is B, and Z = S-K 2 ×(A-B)，K 2 ＝6。
12. The method for controlling the water source multi-split system according to claim 4, wherein:
the outdoor unit in the water source multiple on-line system is the outdoor unit of claim 2;
the control method comprises the following steps;
and controlling the opening and closing of the third valve according to the opening and closing state of the outdoor unit.
13. The method as claimed in claim 12, wherein the controlling of the opening and closing of the third valve according to the opening and closing state of the outdoor unit comprises:
when the outdoor unit is opened, the third valve is closed;
when the outdoor unit is shut down, the opening and closing of the third valve of the outdoor unit are controlled according to the magnitude relation between the condensation pressure corresponding to the saturation temperature of the outdoor unit and a first preset temperature and a second preset temperature, wherein the first preset temperature is higher than the second preset temperature.
14. The method of claim 13, wherein the opening and closing of the third valve of the outdoor unit is controlled according to a magnitude relationship between a saturation temperature corresponding to the condensing pressure of the outdoor unit and a first preset temperature and a second preset temperature, specifically:
in a third preset time, if the condensation pressure of the outdoor unit is higher than the saturation temperature corresponding to the first preset temperature, opening the third valve;
in a third preset time, if the condensation pressure of the outdoor unit is lower than the saturation temperature corresponding to the second preset temperature, closing the third valve;
and in a third preset time, if the condensation pressure of the outdoor unit is higher than the saturation temperature corresponding to the second preset temperature and lower than the first preset temperature, keeping the opening and closing state of the third valve.
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Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3261585B1 (en) * | 2000-09-28 | 2002-03-04 | 照皇 岩崎 | Refrigerant recovery device |
| JP2002228281A (en) * | 2001-01-31 | 2002-08-14 | Sanyo Electric Co Ltd | Air conditioner |
| WO2006073048A1 (en) * | 2005-01-04 | 2006-07-13 | Toshiba Carrier Corporation | Refrigerating cycle device and rotary hermetic compressor |
| CN101191686A (en) * | 2006-11-30 | 2008-06-04 | 海尔集团公司 | Air conditioner for implementing high and low pressure side pressure balancing |
| JP2009144940A (en) * | 2007-12-11 | 2009-07-02 | Mitsubishi Heavy Ind Ltd | Heat pump type air conditioner |
| CN101788172A (en) * | 2009-01-22 | 2010-07-28 | 珠海格力电器股份有限公司 | Energy storage air conditioning unit and working method thereof |
| CN101788214A (en) * | 2009-12-18 | 2010-07-28 | 艾默生网络能源有限公司 | Air conditioning condenser |
| CN102734881A (en) * | 2011-04-08 | 2012-10-17 | 约克广州空调冷冻设备有限公司 | Heat pump air conditioning system and method for rapidly draining liquid accumulated in gas-liquid separator |
| CN202993403U (en) * | 2012-11-26 | 2013-06-12 | 广东美的电器股份有限公司 | Air-conditioning outdoor unit and air-conditioning system with same |
| CN203561002U (en) * | 2013-09-11 | 2014-04-23 | 许林 | Unit-type air conditioning unit used for split-type computer and data processing machine room |
| CN105135549A (en) * | 2015-09-11 | 2015-12-09 | 深圳市共济科技有限公司 | Landed type multi-connection precise air conditioner with natural cooling function |
| CN107631525A (en) * | 2017-07-31 | 2018-01-26 | 珠海格力电器股份有限公司 | Two-stage compressor air conditioning system and control method and device thereof |
| CN107894112A (en) * | 2017-11-09 | 2018-04-10 | 珠海格力电器股份有限公司 | High-fall safety control method and air conditioning system |
| CN208567193U (en) * | 2018-06-07 | 2019-03-01 | 邯郸美的制冷设备有限公司 | Air-conditioning system |
| CN109506315A (en) * | 2018-11-29 | 2019-03-22 | 珠海格力电器股份有限公司 | Air conditioner and control method for preventing compressor from running with liquid |
| CN110513818A (en) * | 2019-08-29 | 2019-11-29 | Tcl空调器(中山)有限公司 | A kind of air conditioner refrigerating or heat-production control method, air-conditioning and storage medium |
| CN213841417U (en) * | 2020-11-26 | 2021-07-30 | 珠海格力电器股份有限公司 | Multi-split system |
-
2022
- 2022-10-11 CN CN202211244161.6A patent/CN115899851B/en active Active
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3261585B1 (en) * | 2000-09-28 | 2002-03-04 | 照皇 岩崎 | Refrigerant recovery device |
| JP2002228281A (en) * | 2001-01-31 | 2002-08-14 | Sanyo Electric Co Ltd | Air conditioner |
| WO2006073048A1 (en) * | 2005-01-04 | 2006-07-13 | Toshiba Carrier Corporation | Refrigerating cycle device and rotary hermetic compressor |
| CN101191686A (en) * | 2006-11-30 | 2008-06-04 | 海尔集团公司 | Air conditioner for implementing high and low pressure side pressure balancing |
| JP2009144940A (en) * | 2007-12-11 | 2009-07-02 | Mitsubishi Heavy Ind Ltd | Heat pump type air conditioner |
| CN101788172A (en) * | 2009-01-22 | 2010-07-28 | 珠海格力电器股份有限公司 | Energy storage air conditioning unit and working method thereof |
| CN101788214A (en) * | 2009-12-18 | 2010-07-28 | 艾默生网络能源有限公司 | Air conditioning condenser |
| CN102734881A (en) * | 2011-04-08 | 2012-10-17 | 约克广州空调冷冻设备有限公司 | Heat pump air conditioning system and method for rapidly draining liquid accumulated in gas-liquid separator |
| CN202993403U (en) * | 2012-11-26 | 2013-06-12 | 广东美的电器股份有限公司 | Air-conditioning outdoor unit and air-conditioning system with same |
| CN203561002U (en) * | 2013-09-11 | 2014-04-23 | 许林 | Unit-type air conditioning unit used for split-type computer and data processing machine room |
| CN105135549A (en) * | 2015-09-11 | 2015-12-09 | 深圳市共济科技有限公司 | Landed type multi-connection precise air conditioner with natural cooling function |
| CN107631525A (en) * | 2017-07-31 | 2018-01-26 | 珠海格力电器股份有限公司 | Two-stage compressor air conditioning system and control method and device thereof |
| CN107894112A (en) * | 2017-11-09 | 2018-04-10 | 珠海格力电器股份有限公司 | High-fall safety control method and air conditioning system |
| CN208567193U (en) * | 2018-06-07 | 2019-03-01 | 邯郸美的制冷设备有限公司 | Air-conditioning system |
| CN109506315A (en) * | 2018-11-29 | 2019-03-22 | 珠海格力电器股份有限公司 | Air conditioner and control method for preventing compressor from running with liquid |
| CN110513818A (en) * | 2019-08-29 | 2019-11-29 | Tcl空调器(中山)有限公司 | A kind of air conditioner refrigerating or heat-production control method, air-conditioning and storage medium |
| CN213841417U (en) * | 2020-11-26 | 2021-07-30 | 珠海格力电器股份有限公司 | Multi-split system |
Non-Patent Citations (1)
| Title |
|---|
| 田中直树;弓仓恒雄;王宝娣;: "空调器的冷剂量分布和过渡特性", 机电设备, no. 08 * |
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