CN215675948U - Refrigerant circulation volume adjusting device and air conditioning system - Google Patents
Refrigerant circulation volume adjusting device and air conditioning system Download PDFInfo
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- CN215675948U CN215675948U CN202121521911.0U CN202121521911U CN215675948U CN 215675948 U CN215675948 U CN 215675948U CN 202121521911 U CN202121521911 U CN 202121521911U CN 215675948 U CN215675948 U CN 215675948U
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Abstract
The utility model discloses a refrigerant circulation volume adjusting device and an air conditioning system. Wherein, this refrigerant circulation volume adjusting device includes: a first port of the first liquid storage tank is connected between the outdoor heat exchanger and the first throttling device through a first pipeline, and a second port of the first liquid storage tank is connected between the first throttling device and the indoor heat exchanger through a second pipeline; the first valve is arranged on the first pipeline; the second valve is arranged on the second pipeline; and the third valve is arranged between the first connecting point and the first throttling device, and the first connecting point is a connecting point of the first pipeline connected between the outdoor heat exchanger and the first throttling device. The first liquid storage tank connected with the refrigerant circulation loop is arranged, the refrigerant quantity in the first liquid storage tank is adjusted through the valve, the accurate adjustment of the refrigerant circulation quantity in the refrigerant circulation loop is realized, the refrigerant circulation quantity in the air-conditioning system can be adjusted according to the current working condition requirement, and therefore the overall comprehensive energy efficiency of the air-conditioning system is improved.
Description
Technical Field
The utility model relates to the technical field of air conditioners, in particular to a refrigerant circulation quantity adjusting device and an air conditioning system.
Background
At present, the energy efficiency requirement of the air conditioning industry is continuously improved, and in relevant industrial standards, the air conditioning capacity and the energy efficiency grade of the whole machine are not judged only by a single point aiming at rated working conditions, but the comprehensive energy efficiency of the whole machine is reflected in a diversified manner by testing the performances of different working conditions and various loads.
However, usually, the designer only focuses on the energy efficiency of the air conditioner under high load conditions, and neglects low load conditions. According to a large amount of user statistical data, the annual power consumption is very high under the low-load working condition in the operation of the whole machine. Under the low-load working condition, redundant refrigerants in the system do not participate in heat exchange, so that the energy efficiency is low.
Aiming at the problem of how to improve the energy efficiency of an air conditioning system in the prior art, an effective solution is not provided at present.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a refrigerant circulation quantity adjusting device and an air conditioning system, and at least solves the problem of how to improve the energy efficiency of the air conditioning system in the prior art.
In order to solve the above technical problem, an embodiment of the present invention provides a refrigerant circulation amount adjusting device, including: a first port of the first liquid storage tank is connected between the outdoor heat exchanger and the first throttling device through a first pipeline, and a second port of the first liquid storage tank is connected between the first throttling device and the indoor heat exchanger through a second pipeline;
the first valve is arranged on the first pipeline;
the second valve is arranged on the second pipeline;
and the third valve is arranged between a first connecting point and the first throttling device, wherein the first connecting point is a connecting point of the first pipeline connected to the outdoor heat exchanger and the first throttling device.
Optionally, the second pipeline is further provided with a first check valve for prohibiting refrigerant from flowing into the first liquid storage tank from the second pipeline.
Optionally, a second throttling device is further disposed on the second pipeline.
Optionally, the first liquid storage tank further comprises an air outlet port, and the air outlet port is connected between the third valve and the first throttling device through a third pipeline.
Optionally, a second check valve is disposed on the third pipeline and is configured to prohibit the refrigerant from flowing into the first liquid storage tank from the third pipeline.
Optionally, the second port is located at the lowest point of the bottom of the first liquid storage tank.
Optionally, the refrigerant circulation amount adjusting device further includes: and a port of the second liquid storage tank is connected between the first throttling device and the indoor heat exchanger through a fourth valve, and the second liquid storage tank is used for supplementing a refrigerant to the refrigerant circulation loop in the heating mode.
An embodiment of the present invention further provides an air conditioning system, including: the embodiment of the utility model provides a refrigerant circulation quantity adjusting device.
By applying the technical scheme of the utility model, the first liquid storage tank connected with the refrigerant circulation loop is arranged, the first port of the first liquid storage tank is connected between the outdoor heat exchanger and the first throttling device, the second port of the first liquid storage tank is connected between the first throttling device and the indoor heat exchanger, and the refrigerant quantity in the first liquid storage tank is adjusted through the first valve, the second valve and the third valve, so that the accurate adjustment of the refrigerant circulation quantity in the refrigerant circulation loop is realized, the refrigerant circulation quantity in the air-conditioning system can be adjusted according to the current working condition requirement, and the overall comprehensive energy efficiency of the air-conditioning system is improved. The refrigerant flow direction in the refrigerant circulation loop is combined, the refrigerant can be controlled to flow into or flow out of the first liquid storage tank through the opening and closing time of the first valve and the second valve, and therefore the refrigerant circulation quantity is accurately adjusted. The on-off of the refrigerant circulation loop can be controlled through the third valve arranged on the refrigerant circulation loop so as to adjust the refrigerant circulation quantity in a matching manner.
Drawings
Fig. 1 is a first schematic view of a refrigerant circulation amount adjusting device according to a first embodiment of the present invention;
fig. 2 is a second schematic diagram of a refrigerant circulation amount adjusting device according to a first embodiment of the present invention;
fig. 3 is a third schematic view of a refrigerant circulation amount adjusting device according to a first embodiment of the present invention;
fig. 4 is a flowchart of a refrigerant circulation amount adjusting method according to a second embodiment of the present invention;
fig. 5 is a schematic flow chart illustrating a method for adjusting refrigerant circulation volume in a refrigeration mode according to a second embodiment of the present invention;
fig. 6 is a flowchart of a refrigerant circulation amount adjusting method according to a third embodiment of the present invention;
description of reference numerals:
the system comprises a first liquid storage tank 10, an outdoor heat exchanger 20, a first throttling device 30, an indoor heat exchanger 40, a compressor 50, a first valve 11, a second valve 12, a third valve 13, a first one-way valve 14, a second throttling device 15, a second one-way valve 16, a second liquid storage tank 17, a fourth valve 18, an outer machine fan blade 21, an outer machine environment temperature sensing bulb 22, an inner machine fan blade 41, an inner machine environment temperature sensing bulb 42, an inner machine pipe temperature sensing bulb 43 and a four-way valve 60.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the utility model described herein are capable of operation in sequences other than those illustrated or described herein.
In the embodiment of the utility model, closing the valve means controlling the valve to be in a closed state, and opening the valve means controlling the valve to be in an open state. When the operation of closing the valve is performed, if the valve is currently in the closed state, the closed state of the valve is maintained, and if the valve is currently in the open state, the valve is changed from the open state to the closed state. Similarly, when the operation of opening the valve is performed, if the valve is currently in the closed state, the valve is changed from the closed state to the open state, and if the valve is currently in the open state, the open state of the valve is maintained.
Example one
The embodiment provides a refrigerant circulation volume adjusting device which can improve the energy efficiency of an air conditioning system. The refrigerant circulation amount refers to the amount of refrigerant participating in cooling or heating operation in a refrigerant circulation circuit of the air conditioning system. The refrigerant circulation circuit includes: the refrigerant circulation loop further comprises a reversing device (such as a four-way valve) for switching the refrigerating operation and the heating operation if the refrigerant circulation loop is a heat pump air conditioning system.
Fig. 1 is a schematic view of a refrigerant circulation amount adjusting device according to a first embodiment of the present invention, and as shown in fig. 1, the refrigerant circulation amount adjusting device includes:
a first port of the first liquid storage tank 10 is connected between the outdoor heat exchanger 20 and the first throttling device 30 through a first pipeline, and a second port of the first liquid storage tank 10 is connected between the first throttling device 30 and the indoor heat exchanger 40 through a second pipeline;
the first valve 11 is arranged on the first pipeline;
a second valve 12 provided on the second line;
and a third valve 13 disposed between a first connection point, which is a connection point where the first pipe is connected to the outdoor heat exchanger 20 and the first throttling device 30, and the first throttling device 30.
The first valve 11, the second valve 12, and the third valve 13 are control valves for adjusting the amount of refrigerant in the first receiver 10. The first liquid storage tank 10 is connected with the refrigerant circulation loop, and the refrigerant circulation quantity in the refrigerant circulation loop can be adjusted by adjusting the refrigerant quantity in the first liquid storage tank 10.
The refrigerant circulation volume adjusting device of this embodiment sets up the first liquid storage pot that is connected with refrigerant circulation circuit, the first port of first liquid storage pot is connected to between outdoor heat exchanger and the first throttling arrangement, the second port of first liquid storage pot is connected to between first throttling arrangement and the indoor heat exchanger, through first valve, second valve and third valve, adjust the refrigerant volume in the first liquid storage pot, realize the accurate regulation to refrigerant circulation volume in refrigerant circulation circuit, can adjust the refrigerant circulation volume in the air conditioning system according to current operating mode demand, thereby improve the efficiency is synthesized to the complete machine of air conditioning system. The refrigerant flow direction in the refrigerant circulation loop is combined, the refrigerant can be controlled to flow into or flow out of the first liquid storage tank through the opening and closing time of the first valve and the second valve, and therefore the refrigerant circulation quantity is accurately adjusted. The on-off of the refrigerant circulation loop can be controlled through the third valve arranged on the refrigerant circulation loop so as to adjust the refrigerant circulation quantity in a matching manner.
The second port of the first liquid storage tank 10 is located at the lowest point of the bottom of the first liquid storage tank 10, so that the refrigerant in the first liquid storage tank 10 can be completely discharged.
The second pipeline is further provided with a first check valve 14 for prohibiting the refrigerant from flowing into the first reservoir tank 10 from the second pipeline. Through first check valve 14, can guarantee the refrigerant one-way circulation, avoid the refrigerant palirrhea to make the refrigerant in the first liquid storage pot 10 flow out and get into in the refrigerant circulation circuit through the second port, increase refrigerant circulation volume.
And a second throttling device 15 is further arranged on the second pipeline and used for throttling the refrigerant flowing out of the first liquid storage tank 10, and the refrigerant throttled by the second throttling device 15 enters a refrigerant circulation loop, so that the heat exchange performance of the indoor heat exchanger can be ensured, and the operation effect of the air conditioning system is further ensured.
It should be noted that the order of arranging the second valve 12, the first check valve 14, and the second throttling device 15 on the second pipeline is not limited in the embodiment of the present invention, as long as the related functions can be ensured.
In an alternative embodiment, the first fluid reservoir 10 may employ a gas-liquid separator provided with an outlet port. As shown in fig. 2, the first liquid storage tank 10 further includes an air outlet port connected between the third valve 13 and the first throttling device 30 through a third pipeline. The third pipeline is provided with a second check valve 16 for prohibiting the refrigerant from flowing into the first reservoir tank 10 from the third pipeline. Through the second check valve 16, the one-way circulation of the refrigerant can be ensured, and the backflow of the refrigerant is avoided, so that the refrigerant in the refrigerant circulation loop cannot flow into the first liquid storage tank 10 through the air outlet port.
As shown in fig. 3, the refrigerant circulation amount adjusting device may further include: and a port of the second reservoir 17 is connected between the first throttling device 30 and the indoor heat exchanger 40 through a fourth valve 18, and the second reservoir 17 is used for supplementing a refrigerant to the refrigerant circulation loop in the heating mode. Under the refrigeration mode, partial refrigerant can be placed in the second liquid storage tank 17, so that the refrigerant under the refrigeration mode is not excessive, the refrigeration effect and the energy efficiency are ensured, and under the heating mode, a proper amount of refrigerant in the second liquid storage tank 17 can be discharged into a refrigerant circulation loop according to the current working condition requirement, so that the heating effect and the energy efficiency are improved.
The capacity of the second liquid storage tank can be determined through experiments, and specifically is the volume of the saturated liquid refrigerant corresponding to the refrigerant quantity when the optimal energy efficiency is declared at the lowest temperature. The minimum temperature is declared to be the lowest temperature in the working conditions suitable for the air conditioning system, for example, the working conditions suitable for the air conditioning system are-20 ℃ to 30 ℃, and the minimum temperature is declared to be-20 ℃.
The first valve 11, the second valve 12, the third valve 13, and the fourth valve 18 may be valve elements having an opening and closing function, such as solenoid valves. The first throttle device 30 and the second throttle device 15 may be electronic expansion valves, capillary tubes, or other throttle members.
The present embodiment also provides an air conditioning system, including: the refrigerant circulation volume adjusting device. The air conditioning system can adjust the refrigerant circulation quantity in the air conditioning system according to the current working condition requirement, so that the overall comprehensive energy efficiency of the air conditioning system is improved.
Example two
The present embodiment provides a method for adjusting a refrigerant circulation amount in a refrigeration mode, which can be implemented based on the apparatus for adjusting a refrigerant circulation amount described in the first embodiment, and is suitable for a single-cooling air conditioning system or a heat pump air conditioning system. For details of the refrigerant circulation amount adjusting device, which are not described in detail in this embodiment, reference may be made to the contents of the first embodiment.
Fig. 4 is a flowchart of a refrigerant circulation amount adjusting method according to a second embodiment of the present invention, and as shown in fig. 4, the method includes the following steps:
s401, in the refrigeration mode, judging whether the current outdoor temperature is less than a first preset temperature.
S402, if the current outdoor temperature is lower than the first preset temperature, calculating the difference value between the current outdoor temperature and the current indoor temperature.
And S403, adjusting the refrigerant circulation quantity in the air conditioning system by using the first liquid storage tank according to the difference value and the second preset temperature.
The first port of the first liquid storage tank is connected between the outdoor heat exchanger and the first throttling device through a first pipeline, and the second port of the first liquid storage tank is connected between the first throttling device and the indoor heat exchanger through a second pipeline.
The outdoor temperature can be detected by the outdoor unit environment bulb 22, and the indoor temperature can be detected by the indoor unit environment bulb 42. The first preset temperature is used for judging whether the air conditioning system is in an outdoor low-temperature low-load working condition in the refrigeration mode, and the first preset temperature can be set according to the actual use environment of the air conditioning system, for example, the value of the first preset temperature can be any value in a temperature range [22 ℃, 30 ℃). If the current outdoor temperature is lower than the first preset temperature, the outdoor temperature is low, and for the refrigeration mode, the air conditioning system is in a low-load working condition, and the refrigerant circulation quantity of the air conditioning system needs to be adjusted to improve the energy efficiency.
The second preset temperature is used for judging whether the indoor and outdoor temperature difference is too large in the refrigeration mode, and the second preset temperature can be set according to actual conditions, for example, the value of the second preset temperature can be any value in a temperature range [0 ℃, 3 ℃).
According to the refrigerant circulation quantity adjusting method, in the refrigeration mode, if the current outdoor temperature is lower than the first preset temperature, the refrigerant circulation quantity in the air conditioning system is adjusted by the first liquid storage tank according to the difference value between the current outdoor temperature and the current indoor temperature and the second preset temperature, and the judgment can be carried out according to the indoor and outdoor temperature difference and the second preset temperature, so that the refrigerant circulation quantity in the air conditioning system is accurately reduced according to the actual requirement of the current working condition, the whole machine operation power under the low-load working condition of low outdoor temperature is reduced, the energy efficiency under the low-load working condition is improved, and the whole machine comprehensive energy efficiency of the air conditioning system is improved.
If the current outdoor temperature is greater than or equal to the first preset temperature, the outdoor temperature is high, for the refrigeration mode, the air-conditioning system is in a high-load working condition, the refrigerant circulation quantity of the air-conditioning system does not need to be adjusted, the normal refrigeration operation of the air-conditioning system is controlled, specifically, the first valve and the second valve can be closed, and the third valve is opened, so that the normal refrigeration operation of the air-conditioning system is realized.
In one embodiment, the adjusting the refrigerant circulation amount in the air conditioning system by using the first liquid storage tank according to the difference value and the second preset temperature includes: judging whether the difference value is greater than or equal to a second preset temperature or not; if the difference value is less than the second preset temperature, closing the second valve and the third valve, opening the first valve, controlling the first valve to be continuously opened for the first time, closing the first valve and opening the third valve so as to enable the air-conditioning system to normally perform refrigeration operation; and if the difference is greater than or equal to the second preset temperature, closing the second valve and the third valve, opening the first valve, controlling the first valve to be continuously opened for a second time, and then closing the first valve and opening the third valve so as to enable the air-conditioning system to normally perform refrigeration operation.
The first valve is arranged on the first pipeline, the second valve is arranged on the second pipeline, the third valve is arranged between the first connecting point and the first throttling device, and the first connecting point is a connecting point of the first pipeline connected to the outdoor heat exchanger and the first throttling device.
In the refrigeration mode, if the first valve is opened, the refrigerant in the refrigerant circulation loop enters the first liquid storage tank, and the refrigerant circulation volume is reduced.
This embodiment is according to the size of indoor outer difference in temperature and the second preset temperature, decides the length of opening of first valve, utilizes first liquid storage pot to carry out the stock solution of different degrees to realized carrying out the regulation of refrigerant circulation volume according to current operating mode actual demand.
Further, before controlling the first valve to be continuously opened for the first time, the method further includes: and calculating the first time according to the current outdoor temperature, the first preset temperature, the third preset temperature and the first preset time. And the third preset temperature is the maximum outdoor temperature corresponding to the condition that the energy efficiency of the whole air-conditioning system is optimal under the condition that the first liquid storage tank is filled. The first predetermined time is the time required to fill the first reservoir at the current compressor frequency. According to the embodiment, the first time is obtained by calculating according to the current outdoor temperature, the first preset temperature, the third preset temperature and the first preset time, namely the opening duration of the first valve is obtained by calculating according to actual requirements, so that the refrigerant circulation quantity can be reduced according to the actual requirements, and the energy efficiency is improved.
As a preferred embodiment, the first time may be calculated according to the following formula:
wherein, t1Denotes a first time, T1Representing a first predetermined temperature, TOuter coverIndicating the current outdoor temperature, TOuter maxDenotes a third predetermined temperature, tmaxRepresenting a first preset time.
The third preset temperature will be explained below. Taking table 1 as an example, the optimal refrigerant filling amount (i.e., the optimal refrigerant circulation amount required by the air conditioning system) of the air conditioning system under the high load condition of normal or high outdoor temperature is 1000g, the optimal refrigerant filling amount at the outdoor temperature of 26 ℃ is 950g, the optimal refrigerant filling amount at the outdoor temperature of 24 ℃ is 900g, the optimal refrigerant filling amount at the outdoor temperature of 22 ℃ is 850g, and when the outdoor temperature is lower than 22 ℃, the refrigerant is reduced, and the energy efficiency is rather reduced. This 22 c is the third predetermined temperature. The type of the first liquid storage tank can be selected according to the optimal refrigerant filling amount corresponding to the third preset temperature, that is, the capacity of the first liquid storage tank is selected, in this example, the capacity of the first liquid storage tank is 150g (that is, 1000g to 850g) of the saturated liquid refrigerant volume.
TABLE 1 outdoor temp. and optimum refrigerant filling quantity corresponding table
| Outdoor temperature (. degree. C.) | 35 | 26 | 24 | 22 | 20 | 18 |
| Optimum refrigerant filling quantity (g) of system | 1000 | 950 | 900 | 850 | 850 | 850 |
Further, before controlling the first valve to be continuously opened for the second time, the method further includes: calculating first time according to the current outdoor temperature, the first preset temperature, the third preset temperature and the first preset time; calculating a third time according to the difference value between the current outdoor temperature and the current indoor temperature, a second preset temperature, the internal and external maximum compensation temperature difference and the first preset time; and calculating the sum of the first time and the third time to obtain a second time.
The indoor and outdoor maximum compensation temperature difference can be set according to actual requirements, and it can be understood that when the indoor and outdoor temperature difference reaches a certain degree, the refrigerant is increased and decreased at the moment, the energy efficiency cannot be improved, and the indoor and outdoor maximum compensation temperature difference can be determined through experiments according to the principle. The calculated third time may be a positive or negative value.
According to the embodiment, under the condition that the indoor and outdoor temperature difference is large, the third time is calculated based on the indoor and outdoor temperature difference, and the first time is supplemented and adjusted by the third time, so that the opening time of the first valve is controlled more accurately, the accurate control of the refrigerant circulation quantity is ensured, and the energy efficiency is improved.
As a preferred embodiment, the third time may be calculated according to the following formula:
wherein, t2Denotes a third time, T2Representing a second predetermined temperature, TDifference (D)Indicating the current outdoor temperature TOuter coverWith the current indoor temperature TInner partDifference of (D), TDifference (D)＝TOuter cover-TInner part，TDifference maxRepresents the maximum compensated temperature difference between the inside and the outside, tmaxRepresenting a first preset time.
In the refrigeration mode, the current outdoor temperature is lower than the first preset temperature, which indicates that the low-load working condition of low outdoor temperature is met, and the refrigerant circulation quantity of the whole air-conditioning system can be adjusted to improve the energy efficiency. If the difference value between the current outdoor temperature and the current indoor temperature is calculated to be larger than or equal to the second preset temperature, the condition that the whole machine low-load state with large indoor and outdoor temperature difference is met is shown. Because the influence of the complete machine low load with large indoor and outdoor temperature difference on the energy efficiency is larger than the influence of the low load with low outdoor temperature difference on the energy efficiency, the opening time of the first valve is controlled based on the indoor and outdoor temperature difference under the condition, the refrigerant circulation quantity can be more accurately adjusted, and the energy efficiency of the air conditioning system is effectively improved.
An exemplary air conditioning system with a rated filling amount of 1kg of refrigerant is tested by an experiment to obtain TOuter maxAt 22 deg.c, the temperature is 850g corresponding to the optimal refrigerant circulating amount, i.e. the outdoor temperature is continuously decreased, and the optimal refrigerant circulating amount is 850 g. At the moment, the volume corresponding to the first liquid storage tank is 150g of saturated liquid refrigerant volume at the temperature of 22 ℃, and the time t required for filling the first liquid storage tank with the refrigerant is measuredmaxIs 12 s. Let T be1＝28℃，T2＝1℃，TDifference max＝7℃。
When the air conditioning system is running, if TOuter coverAt 26 ℃ and TInner partAt 26 ℃, the duration of the opening of the first valve is
If TOuter coverAt 26 ℃ and TInner partAt 23 deg.C, the duration of the opening of the first valve
If be provided with the second liquid storage pot among the air conditioning system, and the port of second liquid storage pot is connected to between first throttling arrangement and the indoor heat exchanger through the fourth valve, adjusts the refrigerant circulation volume among the air conditioning system, still includes: in the cooling mode, the fourth valve is always closed. For the heat pump air conditioning system, the refrigerant demand during heating is more than the refrigerant demand during refrigeration, and under the refrigeration mode, partial refrigerant can be placed in the second liquid storage tank, and the fourth valve is kept closed, so that the refrigerant under the refrigeration mode is not too much, and the refrigeration effect and the energy efficiency are ensured.
In one embodiment, before determining whether the current outdoor temperature is less than the first preset temperature in the cooling mode, the method further includes: receiving a refrigeration instruction; closing the first valve and the third valve, and opening the second valve to enable the refrigerant in the first liquid storage tank to participate in the refrigeration cycle; and when the preset condition is met, closing the second valve and opening the third valve so as to enable the air conditioning system to normally perform refrigeration operation.
When the first valve and the third valve are closed and the second valve is opened, the pressure of the suction end is continuously reduced due to continuous work of the compressor, the refrigerant in the first liquid storage tank enters the indoor heat exchanger through the second port and then enters the compressor, and the refrigerant circulation amount is increased by using the first liquid storage tank. And the refrigerant in the first liquid storage tank is emptied when the preset condition is met.
After receiving the refrigeration instruction, the embodiment discharges all the refrigerant remained in the first liquid storage tank into the refrigerant circulation loop to ensure that the refrigerant circulation amount is enough when the refrigeration operation is just started.
The preset conditions may be: continuously detecting the current temperature of the inner machine pipe to be equal to the temperature of the inner machine pipe when the compressor is started within a second preset time; alternatively, the second valve is continuously opened for a third predetermined time. Whether the refrigerant in the first liquid storage tank is emptied can be accurately judged according to the preset conditions.
The second preset time may be set according to an actual situation, for example, a value range of the second preset time may be 15 to 30 seconds. In the refrigeration mode, under the conditions that the first valve and the third valve are closed and the second valve is opened, all refrigerants discharged by the compressor exist in the outdoor heat exchanger and cannot flow into the indoor heat exchanger, the refrigerants in the indoor heat exchanger come from the first liquid storage tank, when the refrigerants in the first liquid storage tank are exhausted, the indoor heat exchanger does not refrigerate due to no refrigerant circulation, and therefore the temperature of the inner refrigerant pipe at the moment is equal to the temperature of the inner refrigerant pipe when the compressor is opened. Therefore, whether the refrigerant in the first liquid storage tank is emptied can be judged by detecting whether the current temperature of the inner machine pipe is equal to the temperature of the inner machine pipe when the compressor is started. And under the condition that the current temperature of the inner machine pipe is detected to be equal to the temperature of the inner machine pipe when the compressor is started continuously for the second preset time, the refrigerant in the first liquid storage tank is considered to be emptied, and the judgment is more accurate.
The third preset time is a time length for ensuring that the refrigerant in the first liquid storage tank is emptied, and the third preset time can be set according to actual conditions. The third preset time cannot be set too long to prevent the compressor from idling for a long time to cause damage. For example, the third predetermined time may be in a range of 2 to 3 minutes.
Preferably, under the refrigeration mode, the refrigerant circulation quantity can be periodically adjusted to ensure timely adjustment. Specifically, whether the current outdoor temperature is lower than a first preset temperature is judged according to a preset period. The preset period can be set according to actual requirements, for example, the value range of the preset period can be 10-20min, preferably, the preset period is 15min, that is, it is determined whether the current outdoor temperature is less than the first preset temperature every 15 minutes.
In the operation process, if the change of indoor and outdoor working conditions leads to the change of the running load state of the whole machine, the situation of fluorine deficiency error protection can occur, for example, the outdoor temperature rises, the indoor required cold quantity is increased, and the fluorine deficiency is easy to occur at the moment. In order to prevent the fluorine deficiency from error protection, the method further comprises the following steps: in the refrigeration mode, if the fluorine is lacking or the exhaust protection is performed, the first valve and the third valve are closed, and the second valve is opened, so that all refrigerants in the first liquid storage tank participate in the refrigeration cycle; if the fluorine deficiency or the exhaust protection still exists, stopping the machine; and if the fluorine is lacking or the exhaust protection is removed, controlling the air conditioning system to normally perform refrigeration operation. In the embodiment, under the condition of fluorine deficiency or exhaust protection, all refrigerants in the first liquid storage tank participate in the refrigeration cycle to try to solve the problem of fluorine deficiency, if the fluorine deficiency or exhaust protection still occurs, the refrigerant circulation volume adjusting operation does not cause the fluorine deficiency error protection, and the refrigeration cycle can be stopped to avoid unit damage.
Further, after the air conditioning system is controlled to normally perform refrigeration operation if the fluorine deficiency or the exhaust protection is removed, whether the current outdoor temperature is lower than a first preset temperature or not can be judged according to a preset period so as to adjust the refrigerant circulation quantity; after the circulation quantity of the refrigerant is adjusted, if fluorine deficiency or exhaust protection occurs again, the first valve and the third valve are closed, the second valve is opened, and the refrigerant in the first liquid storage tank is emptied, so that all the refrigerant in the first liquid storage tank participates in the refrigeration cycle; outputting the indication information of lack of fluorine, and no longer executing the operation of adjusting the circulation volume of the refrigerant.
After the problem of fluorine deficiency for the first time is solved through the refrigerant in the first liquid storage tank, if the problem of fluorine deficiency still occurs due to the refrigerant circulation quantity adjusting operation, the refrigerant quantity in the air conditioning system can be determined to be insufficient, the refrigerant in the first liquid storage tank is completely participated in the refrigeration cycle, the refrigerant circulation quantity adjusting operation is not executed, and the fluorine deficiency prompt is carried out.
Referring to fig. 5, a specific flow diagram of a refrigerant circulation amount adjusting method in a refrigeration mode is shown, which includes the following steps:
s501, start.
S502, judging whether T is satisfiedOuter cover≥T1If yes, the process proceeds to S506, and if no, the process proceeds to S503.
S503, judging whether T is satisfiedOuter cover-TInner part≥T2If yes, the process proceeds to S504, and if no, the process proceeds to S505.
And S504, closing the second valve and the third valve, and continuously opening the first valve for t1+ t2 time.
And S505, closing the second valve and the third valve, and opening the first valve continuously for t 1.
And S506, opening the third valve, closing the first valve and the second valve to enable the air-conditioning system to normally perform cooling operation, and returning to execute S502 when a preset period is reached.
EXAMPLE III
The embodiment provides a refrigerant circulation amount adjusting method in a heating mode, which can be implemented based on the refrigerant circulation amount adjusting device in the first embodiment and is suitable for a heat pump air conditioning system. For details of the refrigerant circulation amount adjusting device, which are not described in detail in this embodiment, reference may be made to the contents of the first embodiment.
Fig. 6 is a flowchart of a refrigerant circulation amount adjusting method according to a third embodiment of the present invention, and as shown in fig. 6, the method includes the following steps:
s601, judging whether the current outdoor temperature is lower than a fourth preset temperature or not in the heating mode.
And S602, if the current outdoor temperature is lower than the fourth preset temperature, adjusting the refrigerant circulation quantity in the air conditioning system by using the first liquid storage tank and the second liquid storage tank according to the current outdoor temperature.
The first port of the first liquid storage tank is connected between the outdoor heat exchanger and the first throttling device through a first pipeline, and the second port of the first liquid storage tank is connected between the first throttling device and the indoor heat exchanger through a second pipeline; the second liquid storage tank is connected between the first throttling device and the indoor heat exchanger.
The outdoor temperature may be detected by the outdoor unit environment bulb 22. The fourth preset temperature is used for judging whether the air conditioning system is in the outdoor low-temperature working condition or not in the heating mode, and the fourth preset temperature can be set according to the actual use environment of the air conditioning system, for example, the value of the fourth preset temperature can be 5 ℃. If the current outdoor temperature is lower than the fourth preset temperature, the outdoor temperature is low, and for the heating mode, the refrigerant circulation amount of the air conditioning system needs to be increased to ensure the heating effect and improve the energy efficiency.
In the refrigerant circulation quantity adjusting method of the embodiment, in the heating mode, if the current outdoor temperature is lower than the fourth preset temperature, the refrigerant circulation quantity in the air conditioning system is adjusted by using the first liquid storage tank and the second liquid storage tank according to the current outdoor temperature, and under a low-temperature working condition, the refrigerant circulation quantity in the air conditioning system can be properly increased according to requirements, so that the heating effect is ensured, and the energy efficiency is also improved.
If the current outdoor temperature is greater than or equal to the fourth preset temperature, the outdoor temperature is high, the refrigerant circulation quantity of the air-conditioning system does not need to be adjusted, the normal heating operation of the air-conditioning system is controlled, specifically, the first valve, the second valve and the fourth valve can be closed, the four-way valve is controlled to be communicated with the compressor exhaust port and the indoor heat exchanger and to be communicated with the outdoor heat exchanger and the compressor suction port, and the third valve is opened, so that the normal heating operation of the air-conditioning system is realized.
In one embodiment, adjusting the refrigerant circulation amount in the air conditioning system using the first and second tanks according to the current outdoor temperature includes: controlling the air conditioning system to run according to refrigeration starting, closing the first valve, the third valve and the fourth valve, and opening the second valve to increase the refrigerant circulation amount through the first liquid storage tank; when the second valve is continuously opened for a third preset time, the fourth valve is opened to increase the refrigerant circulation quantity through the second liquid storage tank; and after the fourth valve is controlled to be continuously opened for the fourth time, the second valve and the fourth valve are closed, and the third valve is opened, so that the air-conditioning system can normally perform heating operation.
The first valve is arranged on the first pipeline, the second valve is arranged on the second pipeline, the third valve is arranged between the first connecting point and the first throttling device, the first connecting point is a connecting point of the first pipeline connected to the outdoor heat exchanger and the first throttling device, and the second liquid storage tank is connected between the first throttling device and the indoor heat exchanger through the fourth valve.
The third preset time is a time length for ensuring that the refrigerant in the first liquid storage tank is emptied, and the third preset time can be set according to actual conditions. The third preset time cannot be set too long to prevent the compressor from idling for a long time to cause damage. For example, the third predetermined time may be in a range of 2 to 3 minutes.
The fourth time is determined according to the current outdoor temperature, specifically, the interval where the current outdoor temperature is located is determined, and then the time corresponding to the interval where the current outdoor temperature is located is determined according to the corresponding relation between the preset temperature interval and the time, and is used as the fourth time.
Specifically, the fourth time (t0) may be determined according to Table 2, where t is shown in Table 2mIndicating a fourth preset time, i.e., the time required to fill the second reservoir at the current compressor frequency.
TABLE 2 fourth time value schematic table
| Outdoor temperature (. degree. C.) | 5～0 | 0～-5 | -5～-10 | -10 to the declared minimum temperature |
| t0 | 1/4×tm | 1/2×tm | 3/4×tm | tm |
In the heating mode, the first valve is always in a closed state.
In the heating mode, all the refrigerants in the first liquid storage tank are discharged into the refrigerant circulation loop according to the refrigeration startup, and then a proper amount of the refrigerants in the second liquid storage tank are discharged into the refrigerant circulation loop according to the current outdoor temperature, so that the refrigerant circulation amount in the heating mode can be accurately controlled, and the energy efficiency in the heating mode is ensured.
In one embodiment, the above method further comprises: receiving a shutdown instruction in a heating mode; and opening the fourth valve, closing the first valve, the second valve and the third valve, and closing the fourth valve and closing the compressor after fourth preset time.
In the embodiment, the possibility of refrigeration when the heat pump air conditioner is started next time after the heat production is finished is considered, and the refrigerant demand of the heat pump air conditioner during heating is more than that of the heat pump air conditioner during refrigeration, so that the second liquid storage tank is filled when the heat pump air conditioner is heated and shut down, the refrigerant circulation amount during subsequent refrigeration cannot be too much, and the refrigeration effect and the energy efficiency are ensured.
Preferably, under the heating mode, the refrigerant circulation quantity can be periodically adjusted to ensure timely adjustment. Specifically, whether the current outdoor temperature is lower than a fourth preset temperature is judged according to a preset period. The preset period may be set according to actual requirements, for example, the value range of the preset period may be 10-20min, preferably, the preset period is 15min, that is, it is determined whether the current outdoor temperature is less than the fourth preset temperature every 15 minutes.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A refrigerant circulation amount adjusting device is characterized by comprising:
a first port of the first liquid storage tank is connected between the outdoor heat exchanger and the first throttling device through a first pipeline, and a second port of the first liquid storage tank is connected between the first throttling device and the indoor heat exchanger through a second pipeline;
the first valve is arranged on the first pipeline;
the second valve is arranged on the second pipeline;
and the third valve is arranged between a first connecting point and the first throttling device, wherein the first connecting point is a connecting point of the first pipeline connected to the outdoor heat exchanger and the first throttling device.
2. The refrigerant circulation amount adjusting device according to claim 1, wherein a first check valve is further provided on the second pipe for prohibiting the refrigerant from flowing from the second pipe into the first tank.
3. The refrigerant circulation amount adjusting device according to claim 1, wherein a second throttling device is further provided on the second pipe.
4. The refrigerant circulation amount adjustment device according to claim 1, wherein the first tank further includes an outlet port connected between the third valve and the first throttling device through a third pipeline.
5. The refrigerant circulation amount adjustment apparatus according to claim 4, wherein a second check valve is provided on the third pipeline for prohibiting the refrigerant from flowing from the third pipeline into the first tank.
6. The refrigerant circulation amount adjustment device according to any one of claims 1 to 5, wherein the second port is located at a lowest point of a bottom of the first reservoir.
7. The refrigerant circulation amount adjusting device according to any one of claims 1 to 5, further comprising: and a port of the second liquid storage tank is connected between the first throttling device and the indoor heat exchanger through a fourth valve, and the second liquid storage tank is used for supplementing a refrigerant to the refrigerant circulation loop in the heating mode.
8. An air conditioning system, comprising: the refrigerant circulation amount adjusting device according to any one of claims 1 to 7.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113432348A (en) * | 2021-07-05 | 2021-09-24 | 珠海格力电器股份有限公司 | Refrigerant circulation quantity adjusting device and method and air conditioning system |
| CN113432348B (en) * | 2021-07-05 | 2024-03-19 | 珠海格力电器股份有限公司 | Refrigerant circulation quantity adjusting device and method and air conditioning system |
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