CN112178863A

CN112178863A - Refrigerant quantity control device and method and air conditioner

Info

Publication number: CN112178863A
Application number: CN202010824730.9A
Authority: CN
Inventors: 吴春志; 王晨晨; 秦蕊; 陆泳霖; 汤鹏飞
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-08-17
Filing date: 2020-08-17
Publication date: 2021-01-05

Abstract

The invention discloses a refrigerant quantity control device, a method and an air conditioner, wherein the device comprises: the acquisition unit acquires the outdoor environment temperature of the air conditioner; the acquisition unit is also used for acquiring the first exhaust pressure of an exhaust pipe of the air conditioner after the air conditioner runs for a first set time; the control unit is used for determining the magnitude relation between the first exhaust pressure and the corresponding set exhaust pressure at the outdoor environment temperature; if the difference value between the first exhaust pressure and the set exhaust pressure is smaller than the lower limit of the set pressure range, controlling the air conditioner to supplement the refrigerant; and if the difference value between the first exhaust pressure and the set exhaust pressure is larger than the upper limit of the set pressure range, controlling the air conditioner to recover the refrigerant. According to the scheme, the problem that the performance of the air conditioner is affected due to the fact that the refrigerant can not be filled according to different working conditions or different refrigerant demands can be solved, and the effect that the performance of the air conditioner is improved due to the fact that the refrigerant can be filled according to different working conditions or different refrigerant demands can be achieved.

Description

Refrigerant quantity control device and method and air conditioner

Technical Field

The invention belongs to the technical field of air conditioners, and particularly relates to a refrigerant quantity control device and method and an air conditioner.

Background

For an air conditioning system, the amount of refrigerant filling is a large factor affecting the performance of the air conditioner. However, the air conditioner development mainly uses fixed refrigerant perfusion amount, and refrigerant perfusion cannot be performed according to different working conditions or different refrigerant demands, so that the performance of the air conditioner is affected.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

Disclosure of Invention

The invention aims to provide a refrigerant quantity control device, a refrigerant quantity control method and an air conditioner, so as to solve the problem that the performance of the air conditioner is affected because the refrigerant cannot be filled according to different working conditions or different refrigerant demands, and achieve the effect that the performance of the air conditioner can be improved because the refrigerant can be filled according to different working conditions or different refrigerant demands.

The invention provides a refrigerant quantity control device, comprising: the device comprises a collecting unit and a control unit; wherein the acquisition unit is configured to acquire an outdoor ambient temperature of an air conditioner; the acquisition unit is further configured to acquire a first exhaust pressure of an exhaust pipe of the air conditioner after the air conditioner operates for a first set time period; the control unit is configured to determine the magnitude relation between the first exhaust pressure and the corresponding set exhaust pressure at the outdoor environment temperature; if the difference value between the first exhaust pressure and the set exhaust pressure is smaller than the lower limit of the set pressure range, controlling the air conditioner to supplement the refrigerant; if the difference value between the first exhaust pressure and the set exhaust pressure is larger than the upper limit of the set pressure range, controlling the air conditioner to recover the refrigerant; and if the difference between the first exhaust pressure and the set exhaust pressure is greater than or equal to the lower limit of the set pressure range and less than or equal to the upper limit of the set pressure range, controlling the air conditioner to continuously operate.

Optionally, the controlling unit controls the air conditioner to perform refrigerant supplement, including: arranging a first check valve in a low-pressure gas pipeline of the air conditioner, and controlling the first check valve to open so as to supplement a refrigerant to the low-pressure gas pipeline by using a first gas storage tank arranged at a fluid inlet end of the first check valve; wherein the low pressure gas line comprises: and the air suction pipe or a low-pressure pipeline is arranged between the outdoor unit of the air conditioner and the first air storage tank.

Optionally, the controlling unit controls the air conditioner to recover the refrigerant, including: arranging a second one-way valve and a third one-way valve in a high-pressure gas pipeline of the air conditioner and a low-pressure gas pipeline of the air conditioner, and controlling the second one-way valve and the third one-way valve to open so as to recycle refrigerant in the high-pressure gas pipeline of the air conditioner by utilizing a fluid outlet end of the third one-way valve, a second gas storage tank arranged at a fluid inlet end of the second one-way valve and a first gas storage tank arranged at a fluid outlet end of the second one-way valve; wherein, the high-pressure gas pipeline includes: the air conditioner comprises an air conditioner exhaust pipe or a high-pressure pipeline between a compressor exhaust port pipe section of the air conditioner and a throttling device of the air conditioner; under the condition that the space of the outdoor unit of the air conditioner is smaller than a set value, a first one-way valve is arranged in a low-pressure gas pipeline of the air conditioner, and a suction port of a first air storage tank arranged at a fluid inlet end of the first one-way valve is increased or the volume of the suction port is increased, so that the first air storage tank is used for increasing the conveying capacity of refrigerant to the low-pressure gas pipeline to realize refrigerant recovery.

Optionally, the control unit controls the air conditioner to recover refrigerant, and further includes: the acquisition unit is also configured to acquire the temperature of the second air storage tank in the process of controlling the air conditioner to recover the refrigerant; the control unit is also used for arranging a second one-way valve in a high-pressure gas pipeline of the air conditioner and a low-pressure gas pipeline of the air conditioner, and if the temperature of the second gas storage tank is lower than a set temperature, the second one-way valve is controlled to be in a normally open state; if the temperature of the second air storage tank is greater than or equal to the set temperature, controlling the second one-way valve to be in a normally closed state; wherein the second air reservoir is disposed at a fluid inlet end of the second one-way valve and the first air reservoir is disposed at a fluid outlet end of the second one-way valve.

Optionally, the method further comprises: the control unit is further configured to control the air conditioner to continue to operate after controlling the air conditioner to perform refrigerant supplement for a second set time period, and to re-determine the magnitude relation between the first exhaust pressure and the corresponding set exhaust pressure at the outdoor environment temperature after the first set time period; the control unit is further configured to control the air conditioner to continue to operate after controlling the air conditioner to perform refrigerant recovery for a third set time period, and to re-determine the magnitude relation between the first exhaust pressure and the corresponding set exhaust pressure at the outdoor environment temperature after the first set time period; the control unit can be further configured to re-determine the magnitude relation between the first exhaust pressure and the corresponding set exhaust pressure at the outdoor ambient temperature after controlling the air conditioner to continue to operate for a certain time, such as a first set time period.

Optionally, the method further comprises: the control unit is further configured to initiate a warning message of the air conditioner fault and supplement air by controlling an outdoor unit switch of the air conditioner if the number of times of controlling the air conditioner to supplement refrigerants or controlling the air conditioner to recover refrigerants reaches a set number of times at the outdoor environment temperature.

In accordance with another aspect of the present invention, there is provided an air conditioner including: the above-described coolant amount control device.

In another aspect, the present invention provides a method for controlling a refrigerant quantity of an air conditioner, including: acquiring the outdoor environment temperature of the air conditioner; after the air conditioner runs for a first set time, acquiring a first exhaust pressure of an exhaust pipe of the air conditioner; determining a magnitude relationship between the first exhaust pressure and a corresponding set exhaust pressure at the outdoor ambient temperature; if the difference value between the first exhaust pressure and the set exhaust pressure is smaller than the lower limit of the set pressure range, controlling the air conditioner to supplement the refrigerant; if the difference value between the first exhaust pressure and the set exhaust pressure is larger than the upper limit of the set pressure range, controlling the air conditioner to recover the refrigerant; and if the difference between the first exhaust pressure and the set exhaust pressure is greater than or equal to the lower limit of the set pressure range and less than or equal to the upper limit of the set pressure range, controlling the air conditioner to continuously operate.

Optionally, the controlling the air conditioner to perform refrigerant supplement includes: arranging a first check valve in a low-pressure gas pipeline of the air conditioner, and controlling the first check valve to open so as to supplement a refrigerant to the low-pressure gas pipeline by using a first gas storage tank arranged at a fluid inlet end of the first check valve; wherein the low pressure gas line comprises: and the air suction pipe or a low-pressure pipeline is arranged between the outdoor unit of the air conditioner and the first air storage tank.

Optionally, the controlling the air conditioner to recover the refrigerant includes: arranging a second one-way valve and a third one-way valve in a high-pressure gas pipeline of the air conditioner and a low-pressure gas pipeline of the air conditioner, and controlling the second one-way valve and the third one-way valve to open so as to recycle refrigerant in the high-pressure gas pipeline of the air conditioner by utilizing a fluid outlet end of the third one-way valve, a second gas storage tank arranged at a fluid inlet end of the second one-way valve and a first gas storage tank arranged at a fluid outlet end of the second one-way valve; wherein, the high-pressure gas pipeline includes: the air conditioner comprises an air conditioner exhaust pipe or a high-pressure pipeline from a compressor exhaust port pipe section of the air conditioner to a throttling method of the air conditioner; under the condition that the space of the outdoor unit of the air conditioner is smaller than a set value, a first one-way valve is arranged in a low-pressure gas pipeline of the air conditioner, and a suction port of a first air storage tank arranged at a fluid inlet end of the first one-way valve is increased or the volume of the suction port is increased, so that the first air storage tank is used for increasing the conveying capacity of refrigerant to the low-pressure gas pipeline to realize refrigerant recovery.

Optionally, the controlling the air conditioner to recover the refrigerant further includes: in the process of controlling the air conditioner to recover the refrigerant, acquiring the temperature of the second air storage tank; a second one-way valve is further arranged in the high-pressure gas pipeline of the air conditioner and the low-pressure gas pipeline of the air conditioner, and if the temperature of the second gas storage tank is lower than a set temperature, the second one-way valve is controlled to be in a normally open state; if the temperature of the second air storage tank is greater than or equal to the set temperature, controlling the second one-way valve to be in a normally closed state; wherein the second air reservoir is disposed at a fluid inlet end of the second one-way valve and the first air reservoir is disposed at a fluid outlet end of the second one-way valve.

Optionally, the method further comprises: after controlling the air conditioner to supplement refrigerant for a second set time period, controlling the air conditioner to continuously operate, and after the first set time period, re-determining the magnitude relation between the first exhaust pressure and the corresponding set exhaust pressure at the outdoor environment temperature; after controlling the air conditioner to perform refrigerant recovery for a third set time period, controlling the air conditioner to continue to operate, and after the first set time period, re-determining the magnitude relation between the first exhaust pressure and the corresponding set exhaust pressure at the outdoor environment temperature; and after controlling the air conditioner to continuously operate for a certain time, such as a first set time period, re-determining the magnitude relation between the first exhaust pressure and the corresponding set exhaust pressure at the outdoor environment temperature.

Optionally, the method further comprises: and if the air conditioner is controlled to supplement the refrigerant or the number of times of recovering the refrigerant reaches a set number of times, initiating a warning message of the air conditioner fault and supplementing air by controlling an outdoor unit switch of the air conditioner at the outdoor environment temperature.

Therefore, according to the scheme of the invention, the pressure value of the exhaust section of the compressor is detected, the detected exhaust pressure is compared with the stable operation pressure under the corresponding working condition, the refrigerant is supplemented when the exhaust pressure is insufficient, and the refrigerant is recovered when the exhaust pressure is overlarge, so that the refrigerant perfusion amount under different working conditions is adjusted, the problem that the refrigerant perfusion cannot be carried out according to different working conditions or different refrigerant demands so as to influence the air conditioner performance is solved, and the effect of improving the air conditioner performance by carrying out the refrigerant perfusion according to different working conditions or different refrigerant demands is achieved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

Fig. 1 is a schematic structural diagram of a refrigerant quantity control apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an embodiment of a refrigerant quantity control device;

FIG. 3 is a flow diagram of an embodiment of a refrigerant quantity control logic;

FIG. 4 is a flowchart illustrating a refrigerant quantity control method according to an embodiment of the present invention;

fig. 5 is a flowchart illustrating an embodiment of monitoring a temperature of the second air tank during a refrigerant recovery process according to the method of the present invention.

The reference numbers in the embodiments of the present invention are as follows, in combination with the accompanying drawings:

1-an air suction pipe; 2-a first one-way valve; 3-a first gas reservoir; 4-a second one-way valve; 5-a second gas storage tank; 6-a third one-way valve; 7-an exhaust pipe; 8-a first temperature sensor; 9-a controller; 10-a second temperature sensor; 11-a pressure sensor; 12-display panel.

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 clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. 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 embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

According to an embodiment of the present invention, a refrigerant amount control apparatus is provided. Referring to fig. 1, a schematic diagram of an embodiment of the apparatus of the present invention is shown. This refrigerant volume controlling means can use in the control of the refrigerant perfusion volume of air conditioner, and the controlling means of the refrigerant perfusion volume of air conditioner can include: the device comprises a collecting unit and a control unit. The acquisition units, such as the first temperature sensor 8, the second temperature sensor 10, the pressure sensor 11, etc. A control unit, such as a controller 9 of an air conditioner.

Specifically, the collection unit can be configured to acquire the outdoor ambient temperature of the air conditioner in the case where the air conditioner is operated smoothly. For example: a temperature sensor such as a second temperature sensor 10 is arranged on the outer side of the condenser part, and the working conditions of the air conditioner are determined by detecting the temperature of the external environment, such as the temperature of an outdoor dry bulb under a T1 working condition of 35 ℃, the temperature of an outdoor dry bulb under a T3 working condition of 46 ℃, the load difference of the compressor under different working conditions is large, and the corresponding exhaust pressures are different. The condenser is externally provided with 1 temperature sensing bulb (such as a second temperature sensor 10) for monitoring the external environment temperature T0. The outdoor environment temperature sensor (such as the second temperature sensor 10) can directly utilize the original temperature sensing bulb of the outdoor unit without increasing the cost.

Specifically, the collecting unit can be further configured to obtain a first exhaust pressure of an exhaust pipe of the air conditioner after the air conditioner operates for a first set time period, for example, a pressure sensor 11 is disposed on the exhaust pipe 7, and the exhaust pressure of the exhaust pipe 7 is monitored to be P1.

In particular, the control unit can be configured to determine a magnitude relationship between the first discharge pressure and a corresponding set discharge pressure at the outdoor ambient temperature. The outdoor environment temperature corresponds to a working condition, and the exhaust pressure of the compressor is set exhaust pressure when the air conditioner operates stably under the working condition. The system smooth operation pressure is P0 under the working condition of the outdoor environment temperature, namely the corresponding exhaust pressure at the external environment temperature T0 is P0. The system operation time t1 minutes later is judged to be stable.

Specifically, the control unit may be further configured to control the air conditioner to perform refrigerant replenishment if a difference between the first discharge pressure and the set discharge pressure is smaller than a lower limit of a set pressure range. For example: and after the system operates for t1 minutes, if the system exhaust pressure P1 is less than the system stable operation pressure P0-x, the controller judges that the system pressure is insufficient due to refrigerant shortage of the system.

In some embodiments, the controlling unit controlling the air conditioner to supplement the refrigerant may include: a first check valve 2 is arranged in a low-pressure gas pipeline of the air conditioner, the first check valve 2 is controlled to be opened, and therefore a first gas storage tank 3 arranged at a fluid inlet end of the first check valve 2 is used for supplementing a refrigerant to the low-pressure gas pipeline.

Wherein the low pressure gas line may include: the suction duct 1, for example: the control direction of the supplementary refrigerant is as follows: the first air storage tank 3, the first one-way valve 2 and the air suction pipe 1 are all connected through capillary tubes. When air is supplemented, the first one-way valve 2 is controlled to be opened, the first air storage tank 3 supplements air to the air suction pipe 1, the air supplementing time is t2, and at the moment, the first one-way valve 2 is controlled to be closed, and air supplementing is stopped. Or, a low-pressure pipeline is arranged between the outdoor unit of the air conditioner and the first air storage tank 3. For example: the air supply is not limited to the air suction pipe, and can be arranged at a lower air pressure position from a large stop valve to the air suction port pipe section of the liquid storage tank of the compressor, and the like. In the air conditioner connecting pipeline, the gas from the large valve connecting pipe to the air suction pipe is low-pressure gas, and the air can be supplemented from the air suction pipe by utilizing the pressure difference characteristic.

Therefore, the check valve can also inhibit the one-way flow of gas, the one-way flow of the refrigerant is realized by utilizing the principle of the check valve, the supplement function of the refrigerant is realized, and the pipeline part is taken as the main part, so that the cost is lower.

Specifically, the control unit may be further configured to control the air conditioner to perform refrigerant recovery if a difference between the first discharge pressure and the set discharge pressure is greater than an upper limit of the set pressure range. For example: after the system operates for t1 minutes, if the system exhaust pressure P1> the system steady operation pressure P0+ x, the controller judges that the system pressure is too high due to too much refrigerant.

In some embodiments, the controlling unit controls the air conditioner to recover the refrigerant, and may include any one of the following cases of recovering the refrigerant:

the first refrigerant recovery condition: a second one-way valve 4 and a third one-way valve 6 are arranged in a high-pressure gas pipeline of the air conditioner and a low-pressure gas pipeline of the air conditioner, the second one-way valve 4 and the third one-way valve 6 are controlled to be opened, and therefore refrigerants in the high-pressure gas pipeline of the air conditioner are recycled by means of a fluid outlet end of the third one-way valve 6, a second gas storage tank 5 arranged at a fluid inlet end of the second one-way valve 4 and a first gas storage tank 3 arranged at a fluid outlet end of the second one-way valve 4.

Wherein the high pressure gas line may include: the exhaust duct 7 of the air conditioner, for example: the control direction of the recovered refrigerant is as follows: the exhaust pipe 7, the third one-way valve 6, the second air storage tank 2, the second one-way valve 4 and the first air storage tank 3 are all connected through capillary tubes. And during air exhaust, the third one-way valve 6 is controlled to be opened, the exhaust pipe 7 exhausts air to the second air storage tank 5, the air exhaust time is t3, and at the moment, the third one-way valve 6 is controlled to be closed. High temperature, high pressure and the like of exhaust can be buffered through the second gas storage tank 5, and the safety of the device is improved. Or a high-pressure pipeline between a compressor exhaust port pipe section of the air conditioner and a throttling device of the air conditioner. The refrigerant recovery is not limited to the discharge pipe, and may be performed at a place where the air pressure is high, such as before the compressor discharge pipe section to the throttle device. In the air conditioner connecting pipeline, the gas from the exhaust pipe to the front of the throttling device is high-pressure gas, and the gas can be collected from the exhaust pipe to the front of the throttling device by utilizing the pressure difference characteristic.

The second refrigerant recovery condition: under the condition that the space of the outdoor unit of the air conditioner is smaller than a set value, a first one-way valve 2 is arranged in a low-pressure gas pipeline of the air conditioner, and a suction port of a first air storage tank 3 arranged at a fluid inlet end of the first one-way valve 2 is enlarged or the volume of the suction port is enlarged, so that the refrigerant conveying amount of the first air storage tank 3 is increased in the low-pressure gas pipeline to realize refrigerant recovery.

For example: aiming at the conditions of low cost, small outdoor unit space and the like, the second air storage tank 5 and the first temperature sensor 8 can be omitted, and the air suction port of the first air storage tank 3 is enlarged or the volume of the air suction port of the first air storage tank is enlarged, so that the functions of pressure reduction and buffering are achieved. The embodiment also has all the functions of the scheme of the invention, the machine type has small cold quantity, the exhaust pressure is not high, the whole stability cannot be influenced by canceling the second air storage tank 5, namely, the cost can be reduced and the space can be saved by properly reducing the precision.

Therefore, the intelligent refrigerant quantity reminding system has the interaction function of intelligently reminding a user of the refrigerant quantity condition by simultaneously having the functions of recovering and supplementing the refrigerant, so that the user can supplement the refrigerant by himself. The one-way valve can also inhibit the one-way flow of gas, the one-way flow of the refrigerant is realized by utilizing the principle of the one-way valve, the recovery function of the refrigerant is realized, and the pipeline is mainly used, so that the cost is lower.

In some embodiments, in the first refrigerant recovery case, the control unit may control the air conditioner to perform refrigerant recovery, and may further include: the process of monitoring the temperature of the second air storage tank in the refrigerant recovery process may specifically refer to the following exemplary description.

The acquisition unit can also be configured to acquire the temperature of the second air storage tank 5 in the process of controlling the air conditioner to recover the refrigerant.

The control unit is also used for arranging a second one-way valve 4 in a high-pressure gas pipeline of the air conditioner and a low-pressure gas pipeline of the air conditioner, and if the temperature of the second gas storage tank 5 is lower than a set temperature, the second one-way valve 4 is controlled to be in a normally open state. And if the temperature of the second air storage tank 5 is greater than or equal to the set temperature, controlling the second one-way valve 4 to be in a normally closed state. Wherein, the second air storage tank 5 is arranged at the fluid inlet end of the second one-way valve 4, and the first air storage tank 3 is arranged at the fluid outlet end of the second one-way valve 4. The case of equal is equal to the case of greater, and both indicate higher pressure, which should be normally closed.

For example: a second one-way valve 4 and a third one-way valve 6 are arranged in a high-pressure gas pipeline of the air conditioner and a low-pressure gas pipeline of the air conditioner, the second one-way valve 4 and the third one-way valve 6 are controlled to be opened, and therefore refrigerants in the high-pressure gas pipeline of the air conditioner are recycled by means of a fluid outlet end of the third one-way valve 6, a second gas storage tank 5 arranged at a fluid inlet end of the second one-way valve 4 and a first gas storage tank 3 arranged at a fluid outlet end of the second one-way valve 4.

For example: because the exhaust of the exhaust pipe 7 is high-temperature high-pressure gas, the second gas storage tank 5 is a refrigerant buffer tank and is provided with a temperature sensor (such as the first temperature sensor 8), and when the temperature of the second gas storage tank is monitored to be less than T1, the second check valve 4 is controlled to be in a normally open state. If its temperature > T1 is monitored, the second check valve 4 is controlled to be normally closed.

Therefore, the intelligent monitoring logic is fine, and the intelligent monitoring system has the advantages of accurately adjusting the refrigerant quantity according to different working conditions, reducing the system operation pressure, improving the capacity or reducing the power consumption of the compressor and the like.

Specifically, the control unit may be further configured to control the air conditioner to continue to operate if a difference between the first exhaust pressure and the set exhaust pressure is greater than or equal to a lower limit of the set pressure range and less than or equal to an upper limit of the set pressure range.

Therefore, the system performance under different working conditions is optimized by adjusting the refrigerant perfusion amount under different working conditions; if the high-load working condition capacity such as T3 is met, the refrigerant filling amount needs to be increased; on the contrary, under the relatively low-load working conditions of T1 and the like, part of redundant refrigerant can be recycled, the running load of the system is reduced, the running power of the compressor is reduced, and energy conservation is realized; therefore, the refrigerant filling amount of the system under a specific working condition can be reduced to a certain extent, the pressure of the system is reduced, the power is reduced, and the energy conservation is realized.

In some embodiments, it can further include: for the process of monitoring the refrigerant quantity in a circulating manner, reference may be made to the following exemplary description.

In the refrigerant supplementing control process, the control unit may be further configured to stop controlling the air conditioner to perform refrigerant supplementation after controlling the air conditioner to perform refrigerant supplementation for a second set time period, control the air conditioner to continue to operate, and re-determine a magnitude relationship between the first exhaust pressure and a corresponding set exhaust pressure at the outdoor environment temperature after the first set time period, so as to re-control the refrigerant quantity of the air conditioner according to the re-determined magnitude relationship, if the re-determined magnitude relationship indicates that the refrigerant still needs to be supplemented, continue supplementing the refrigerant, if the re-determined magnitude relationship indicates that the refrigerant does not need to be supplemented and the refrigerant does not need to be recovered, continue to operate, and if the re-determined magnitude relationship indicates that the refrigerant needs to be recovered, continue to recover the refrigerant and sequentially circulate.

For example: the air replenishing time is t2, after air replenishing is finished, the system continues to operate for t1 minutes, the exhaust pressure P1 is monitored to be within the range of P0 +/-x, and the system continues to operate. If the gas is not in the monitoring range, the gas is continuously supplemented or recovered.

In the refrigerant recovery control process, the control unit may be further configured to, after controlling the air conditioner to perform refrigerant recovery for a third set time period, stop controlling the air conditioner to perform refrigerant recovery, control the air conditioner to continue to operate, and after the first set time period, re-determine a magnitude relationship between the first exhaust pressure and a corresponding set exhaust pressure at the outdoor environment temperature, so as to re-control the refrigerant quantity of the air conditioner according to the re-determined magnitude relationship, if the re-determined magnitude relationship indicates that the refrigerant still needs to be supplemented, continue to supplement the refrigerant, if the re-determined magnitude relationship indicates that the refrigerant does not need to be supplemented, continue to operate, and if the re-determined magnitude relationship indicates that the refrigerant needs to be recovered, continue to recover the refrigerant, and sequentially circulate.

For example: and (4) the exhaust time is t3, after the exhaust is finished and the system continues to operate for t1 minutes, the exhaust pressure P1 is monitored to be within the range of P0 +/-x, and the system continues to operate. If the air is not in the monitoring range, air supplement or inspiration is continued.

In the normal operation control process, the control unit may be further configured to, after controlling the air conditioner to continue to operate for a certain time, such as a first set duration, re-determine a magnitude relationship between the first exhaust pressure and a corresponding set exhaust pressure at the outdoor environment temperature, to re-control the refrigerant quantity of the air conditioner according to the re-determined magnitude relationship, continue to supplement the refrigerant if the re-determined magnitude relationship indicates that the refrigerant still needs to be supplemented, continue to operate if the re-determined magnitude relationship indicates that the refrigerant does not need to be supplemented and the refrigerant does not need to be recovered, continue to recover the refrigerant if the re-determined magnitude relationship indicates that the refrigerant needs to be recovered, and sequentially circulate.

Therefore, the state of the system refrigerant can be analyzed by feeding back the state to the controller through the temperature sensor and the pressure sensor, the state of the air-conditioning refrigerant can be reminded to a user through the controller and the designated code, and when the refrigerant is insufficient, the user can supplement the refrigerant to the air storage tank through the stop valve; meanwhile, the air storage tank can contain the refrigerant, so that the refrigerant filling amount of the system cannot be directly influenced, and a user can supplement the refrigerant with specific capacity of the air storage tank without devices such as a pressure gauge and the like.

In some embodiments, it can further include: the process of determining the air conditioner fault after supplementing the refrigerant or recovering the refrigerant for a set number of times may be specifically referred to the following exemplary description.

The control unit can be further configured to initiate a warning message of the air conditioner fault and supplement air by controlling an outdoor unit switch of the air conditioner if the number of times of controlling the air conditioner to supplement the refrigerant or controlling the air conditioner to recover the refrigerant reaches a set number of times under the outdoor environment temperature, namely under the condition that the outdoor environment temperature is constant.

Therefore, under the same working condition, if the system performs air supplement or air suction operation for N times, the system still can not operate according to the exhaust pressure of P0 +/-X, the indoor unit display panel 12 reports a fault code X to remind a user that the system is lack of refrigerant; at this time, air can be supplied through the stop valve of the outdoor unit. The display panel 12 reminds the user of the state of the refrigerant of the system, and the humanization is good. Degree of automation is high, sets up intelligent warning system module, and the user can carry out self simple and easy operation according to reminding, reduces cost of maintenance.

Through a large number of tests, the technical scheme of the invention is adopted, the pressure value of the exhaust interval of the compressor is detected, the detected exhaust pressure is compared with the stable operation pressure under the corresponding working condition, the refrigerant is supplemented when the exhaust pressure is insufficient, and the refrigerant is recovered when the exhaust pressure is overlarge, so that the refrigerant perfusion amount under different working conditions is adjusted, the refrigerant can be recovered or supplemented under different working conditions, and the refrigerant perfusion amount requirement under different working conditions can be met.

According to the embodiment of the invention, the air conditioner corresponding to the refrigerant quantity control device is also provided. The air conditioner may include: the above-described coolant amount control device.

The global climate is changeable, the temperature difference in different seasons is large, and even the temperature change in different time periods in the same day in some places is also large. With the steady advance of the sustainable development concept and the gradual improvement of the environmental protection requirements, most countries and regions put forward different requirements on the capacity and the energy efficiency of air conditioning systems in different climates. In the case of an air conditioning system, the harsher the external environment, the more demanding the air conditioning system. Conversely, when the outside ambient temperature is relatively moderate, the air conditioning system load may become lower. For an air conditioning system, the amount of refrigerant filling is a large factor affecting the performance of the air conditioner. For example: under the same working condition, different perfusion quantities influence the capacity and the energy efficiency; meanwhile, the requirements of different working conditions on the filling amount may be different. However, the air conditioner development mainly adopts fixed refrigerant perfusion amount, and does not distinguish working conditions.

In some embodiments, when T1 is operating at an external ambient temperature of 35 ℃, a capacity of 5275W is required, and a fill volume is required. However, when the temperature of the outer ring is 48 ℃ under the T4 working condition, the capacity is not required, but the energy efficiency is required, and a proper refrigerant filling amount is required to improve the energy efficiency. Therefore, the power can be reduced by reducing the refrigerant filling amount aiming at the T4 working condition; or the filling quantity is increased to improve the T4 working condition capacity, thereby improving the energy efficiency.

In addition, on the premise that the product manufacturing technology is improved, the product quality problem caused by hardware accounts for a small number, most of the problems that the refrigeration or heating effect is poor are experienced by users, and the like, and most of the problems are caused by the fact that the refrigerant is not enough and is filled too much due to the fact that an installer fills the refrigerant in an irregular manner and the like, or the refrigerant leaks and the like along with the lapse of time, so that the refrigerant filling amount is inconsistent with the design, and the performance effect is poor. At this moment, if a device capable of supplementing and recovering the refrigerant is designed, the contradiction can be well solved, so that the customer experience is improved, and the misjudgment of users on the quality problem of product hardware is eliminated.

In some embodiments, the present invention provides a refrigerant quantity control device and a control logic, which can provide a device for recovering or supplementing refrigerants under different working conditions, and can meet the requirements on refrigerant filling quantity under different working conditions.

In the air conditioner connecting pipeline, the gas from the large valve connecting pipe to the air suction pipe is low-pressure gas, the gas from the exhaust pipe to the throttle device is high-pressure gas, and the gas can be supplemented from the air suction pipe and collected from the exhaust pipe to the throttle device by utilizing the pressure difference characteristic. Meanwhile, the one-way valve can inhibit the one-way flow of gas, and sufficient feasibility is provided for the implementation of the scheme.

In some embodiments, the present invention provides a simple refrigerant quantity control device and a simple refrigerant quantity control logic, which have the functions of recovering and supplementing refrigerants, and have the interactive function of intelligently reminding a user of the refrigerant quantity condition of a system, so that the user can supplement the refrigerants by himself. The refrigerant quantity control device and the refrigerant control logic achieve the effects of controlling different filling quantities under different working conditions, reducing the system pressure under specific working conditions so as to save energy, and intelligently reminding a user of the system refrigerant condition so as to remind the user of self-refrigerant supplement.

In some examples, a temperature sensor is arranged outside the condenser part, and by detecting the external environment temperature, for example, the outdoor dry bulb temperature under the T1 working condition is 35 ℃, the outdoor dry bulb temperature under the T3 working condition is 46 ℃, the load difference of the compressor under different working conditions is large, and the corresponding exhaust pressure is different, so that the pressure sensor is used for detecting the pressure value of the exhaust interval and feeding the pressure value back to the controller for analysis to perform automatic air suction and air collection operation, and the purpose of realizing different cooling capacities under different working conditions is achieved. Therefore, the method can meet different requirements on the refrigerant filling amount of the system under different working conditions.

In some examples, the system performance under different working conditions is optimized by adjusting the refrigerant filling amount under different working conditions. If the high-load working condition capacity such as T3 is met, the refrigerant filling amount needs to be increased; on the contrary, under the relatively low-load working conditions of T1 and the like, part of redundant refrigerant can be recycled, the running load of the system is reduced, the running power of the compressor is reduced, and energy conservation is realized. Therefore, the refrigerant filling amount of the system under a specific working condition can be reduced to a certain extent, the pressure of the system is reduced, the power is reduced, and the energy conservation is realized.

In some cases, the refrigerant control is performed by using an electronic expansion valve or other devices, which inevitably causes a problem of high cost. The scheme of the invention realizes the one-way flow of the refrigerant and the recovery and supplement functions of the refrigerant by utilizing the principle of the one-way valve, has simple device, takes the pipeline as the main part and has lower cost. Therefore, the problems of complicated logic and high cost of a device for controlling the flow of the refrigerant by using a device such as an electronic expansion valve and the like can be solved.

In some examples, the state of the system refrigerant can be analyzed by feeding back the state to the controller through the temperature sensor and the pressure sensor, the state of the air-conditioning refrigerant can be reminded to a user through the controller and the designated code, and when the refrigerant is insufficient, the user can supplement the refrigerant to the air storage tank through the stop valve. Meanwhile, the air storage tank can contain the refrigerant, so that the refrigerant filling amount of the system cannot be directly influenced, and a user can supplement the refrigerant with specific capacity of the air storage tank without devices such as a pressure gauge and the like. Degree of automation is high, sets up intelligent warning system module, and the user can carry out self simple and easy operation according to reminding, reduces cost of maintenance.

The following describes an exemplary implementation process of the scheme of the present invention with reference to the examples shown in fig. 2 and fig. 3.

In some embodiments, a check valve a, a gas storage tank b, a temperature sensor c, a pressure sensor d, a capillary tube e, a controller, a display panel, and the like can be provided. The quantities of a, b, c, d, e, f, etc. are determined according to different air conditioning systems, such as one-to-one, one-to-many, etc., and the control accuracy of the refrigerant system.

Fig. 2 is a schematic structural diagram of an embodiment of a refrigerant quantity control device. As shown in fig. 3, the refrigerant quantity control device may include: the air suction pipe comprises an air suction pipe 1, a first check valve 2, a second check valve 4 and a third check valve 6, a first air storage tank 3 and a second air storage tank 5, an air exhaust pipe 7, a first temperature sensor 8 and a second temperature sensor 10, a controller 9, a pressure sensor 11 and a display panel 12.

The air suction pipe 1 is communicated with a fluid outlet end of a first one-way valve 2, a fluid inlet end of the first one-way valve 2 is communicated with a fluid outlet end of a second one-way valve 2 after passing through a first air storage tank 3, a fluid inlet end of a second one-way valve 4 is connected to a fluid outlet end of a third one-way valve 6 after passing through a second air storage tank 5, and a fluid inlet end of the third one-way valve 6 is communicated with an air exhaust pipe 7. A first temperature sensor 8 is arranged at the second air storage tank 5, and a second temperature sensor 10 and a pressure sensor 11 are arranged at the exhaust pipe 7. The control end of the first check valve 2, the control end of the second check valve 4, the control end of the third check valve 6, the first temperature sensor 8, the second temperature sensor 10 and the pressure sensor 11 are all connected to a controller 9, and the controller 9 is connected to a display panel 12.

In the example shown in fig. 2, the supplementary refrigerant control direction is: the first air storage tank 3, the first one-way valve 2 and the air suction pipe 1 are all connected through capillary tubes. The control direction of the recovered refrigerant is as follows: the exhaust pipe 7, the third one-way valve 6, the second air storage tank 2, the second one-way valve 4 and the first air storage tank 3 are all connected through capillary tubes.

In the example shown in fig. 2, the connecting means are capillary tubes, check valves (e.g., the first check valve 2, the second check valve 4, and the third check valve 6), and the like, and thus the cost is low. High temperature, high pressure and the like of exhaust can be buffered through the second gas storage tank 5, and the safety of the device is improved. The outdoor environment temperature sensor (such as the second temperature sensor 10) can directly utilize the original temperature sensing bulb of the outdoor unit without increasing the cost. The display panel 12 reminds the user of the state of the refrigerant of the system, and the humanization is good.

Fig. 3 is a flowchart illustrating an embodiment of a refrigerant quantity control logic. As shown in fig. 3, the refrigerant quantity control logic may include:

step 1, executing a refrigerant system monitoring logic, and then executing step 2 or step 3.

In step 1, the monitoring logic of the refrigerant system is as follows: the condenser is externally provided with 1 temperature sensing bulb (such as a second temperature sensor 10) for monitoring the external environment temperature T0. A pressure sensor 11 is arranged on the exhaust pipe 7, and the exhaust pressure of the exhaust pipe 7 is monitored to be P1; the system smooth operation pressure under the working condition is P0, namely the corresponding exhaust pressure under the external environment temperature T0 is P0. The system operation time t1 minutes later is judged to be stable.

And 2, executing a refrigerant air replenishing control logic, and then executing a step 4.

In step 2, the refrigerant air supply control logic is as follows: when the system runs for t1 minutes, if the system exhaust pressure P1 is smaller than the system stable running pressure P0-x, the controller judges that the system pressure is insufficient due to refrigerant shortage of the system, at the moment, the first one-way valve 2 is controlled to be opened, the first air storage tank 3 supplies air to the air suction pipe 1, the air supply time is t2, at the moment, the first one-way valve 2 is controlled to be closed, after the system continues to run for t1 minutes, the exhaust pressure P1 is monitored to be within the range of P0 +/-x, and the system continues to run. If the gas is not in the monitoring range, the gas is continuously supplemented or recovered.

And step 3, executing a refrigerant recovery control logic, and then executing step 4.

In step 3, the refrigerant recovery control logic is as follows: when the system runs for t1 minutes, if the system exhaust pressure P1> the system steady running pressure P0+ x, the controller judges that the system pressure is too high due to too much refrigerant, at the moment, the third one-way valve 6 is controlled to be opened, the exhaust pipe 7 exhausts air to the second air storage tank 5, the exhaust time is t3, at the moment, the third one-way valve 6 is controlled to be closed, after the system continues to run for t1 minutes, the exhaust pressure P1 is monitored to be within the range of P0 +/-x, and the system continues to run. If the air is not in the monitoring range, air supplement or inspiration is continued. Particularly, since the exhaust gas of the exhaust pipe 7 is high-temperature and high-pressure gas, the second gas storage tank 5 is a refrigerant buffer tank and is provided with a temperature sensor (for example, the first temperature sensor 8), and when the temperature is monitored to be less than T1, the second check valve 4 is controlled to be in a normally open state. If its temperature > T1 is monitored, the second check valve 4 is controlled to be normally closed.

Step 4, intelligent reminding function logic: under the same working condition, if the system performs air supplement or air suction operation for N times, the system still can not operate according to the exhaust pressure of P0 +/-X, the indoor unit display panel 12 reports a fault code X to remind a user that the system lacks refrigerant. At this time, air can be supplied through the stop valve of the outdoor unit.

For example: some refrigerant modes need the manometer to fill according to system pressure, and this patent is owing to there is refrigerant storage jar and system refrigerant perfusion volume governing system, so need not the manometer, only need fixed replenishment a certain amount of refrigerant, that is to say, if set for weight A, then the user only need follow little stop valve department at every turn replenish the weight be A refrigerant can, by the system by oneself according to this weight of system for A refrigerant can be a bottle, the refrigerant is used by self-filling after the special customer sells.

In some embodiments, the air supply is not limited to the air suction pipe, and can be at a lower air pressure position from a large stop valve to the air suction port pipe section of the compressor liquid storage tank. For example: the large valve connecting pipe to the air suction port of the compressor is low-pressure gas.

In some embodiments, the refrigerant recovery is not limited to the discharge pipe, and may be performed at a higher pressure such as before the compressor discharge pipe section reaches the throttle device. For example: before the compressor exhaust port reaches the capillary tube throttling, high-pressure gas is formed.

In some embodiments, the second air tank 5 and the first temperature sensor 8 may be omitted, and the suction port of the first air tank 3 may be enlarged or the volume thereof may be enlarged to perform the pressure reducing and buffering functions, for the low cost and the small outdoor space. The embodiment also has all the functions of the scheme of the invention, the machine type has small cold quantity, the exhaust pressure is not high, the whole stability cannot be influenced by canceling the second air storage tank 5, namely, the cost can be reduced and the space can be saved by properly reducing the precision.

The scheme of the invention has fine intelligent monitoring logic, and has the advantages of accurately adjusting the refrigerant quantity according to different working conditions, reducing the system operation pressure, improving the capacity or reducing the power consumption of the compressor and the like; the number of structural parts is small, the occupied space is small, and the cost is relatively low; possess intelligence and remind the function, possess fine interactive mode, can solve the problem that most arouses by the refrigerant, the user also can carry out the self according to the suggestion and fill the refrigerant, reduces the after-sale demand of visiting, and the guarantee of refrigerant volume of filling also can improve system operating stability and user's travelling comfort.

Since the processing and functions of the air conditioner of this embodiment are basically corresponding to the embodiments, principles and examples of the apparatus shown in fig. 1, the description of this embodiment is not given in detail, and reference may be made to the related descriptions in the embodiments, which are not described herein again.

Through a large number of tests, the technical scheme of the invention is adopted, the pressure value of the exhaust section of the compressor is detected, the detected exhaust pressure is compared with the stable operation pressure under the corresponding working condition, the refrigerant is supplemented when the exhaust pressure is insufficient, and the refrigerant is recovered when the exhaust pressure is overlarge, so that the refrigerant perfusion amount under different working conditions is adjusted, the different perfusion amounts under different working conditions are controlled, the system pressure under the specific working condition is reduced, the energy is saved, and the intelligent reminding user of the refrigerant condition of the system can be realized, so that the user can be reminded of the refrigerant supplementation by himself.

According to an embodiment of the present invention, a method for controlling a refrigerant quantity of an air conditioner corresponding to the air conditioner is also provided, as shown in fig. 4, which is a schematic flow chart of an embodiment of the method of the present invention. The method for controlling the refrigerant filling amount of the air conditioner can be applied to the control of the refrigerant filling amount of the air conditioner, and can comprise the following steps: step S110 to step S160.

At step S110, in case that the air conditioner is operated smoothly, an outdoor ambient temperature of the air conditioner is acquired. For example: a temperature sensor such as a second temperature sensor 10 is arranged on the outer side of the condenser part, and the working conditions of the air conditioner are determined by detecting the temperature of the external environment, such as the temperature of an outdoor dry bulb under a T1 working condition of 35 ℃, the temperature of an outdoor dry bulb under a T3 working condition of 46 ℃, the load difference of the compressor under different working conditions is large, and the corresponding exhaust pressures are different. The condenser is externally provided with 1 temperature sensing bulb (such as a second temperature sensor 10) for monitoring the external environment temperature T0. The outdoor environment temperature sensor (such as the second temperature sensor 10) can directly utilize the original temperature sensing bulb of the outdoor unit without increasing the cost.

At step S120, after the air conditioner is operated for the first set period of time, a first exhaust pressure of an exhaust pipe of the air conditioner is obtained, for example, a pressure sensor 11 is disposed on the exhaust pipe 7, and the exhaust pressure of the exhaust pipe 7 is monitored as P1.

At step S130, a magnitude relationship between the first exhaust pressure and a corresponding set exhaust pressure at the outdoor ambient temperature is determined. The outdoor environment temperature corresponds to a working condition, and the exhaust pressure of the compressor is set exhaust pressure when the air conditioner operates stably under the working condition. The system smooth operation pressure is P0 under the working condition of the outdoor environment temperature, namely the corresponding exhaust pressure at the external environment temperature T0 is P0. The system operation time t1 minutes later is judged to be stable.

In step S140, if the difference between the first exhaust pressure and the set exhaust pressure is smaller than the lower limit of the set pressure range, the air conditioner is controlled to perform refrigerant supplement. For example: and after the system operates for t1 minutes, if the system exhaust pressure P1 is less than the system stable operation pressure P0-x, the controller judges that the system pressure is insufficient due to refrigerant shortage of the system.

In some embodiments, the controlling the air conditioner to supplement the refrigerant in step S130 may include: a first check valve 2 is arranged in a low-pressure gas pipeline of the air conditioner, the first check valve 2 is controlled to be opened, and therefore a first gas storage tank 3 arranged at a fluid inlet end of the first check valve 2 is used for supplementing a refrigerant to the low-pressure gas pipeline.

In step S150, if the difference between the first exhaust pressure and the set exhaust pressure is greater than the upper limit of the set pressure range, the air conditioner is controlled to perform refrigerant recovery. For example: after the system operates for t1 minutes, if the system exhaust pressure P1> the system steady operation pressure P0+ x, the controller judges that the system pressure is too high due to too much refrigerant.

In some embodiments, the controlling the air conditioner to recover the refrigerant in step S150 may include any one of the following cases:

Wherein the high pressure gas line may include: the exhaust duct 7 of the air conditioner, for example: the control direction of the recovered refrigerant is as follows: the exhaust pipe 7, the third one-way valve 6, the second air storage tank 2, the second one-way valve 4 and the first air storage tank 3 are all connected through capillary tubes. And during air exhaust, the third one-way valve 6 is controlled to be opened, the exhaust pipe 7 exhausts air to the second air storage tank 5, the air exhaust time is t3, and at the moment, the third one-way valve 6 is controlled to be closed. The second air storage tank 5 can buffer high temperature, high pressure and the like of exhaust, and the safety of the method is improved. Or a high-pressure pipeline from a compressor exhaust port pipe section of the air conditioner to a throttling method of the air conditioner. The refrigerant recovery is not limited to the discharge pipe, and may be performed at a place where the air pressure is high, such as before the compressor discharge pipe section to the throttle method. In the air conditioner connecting pipeline, the gas before the exhaust pipe reaches the throttling method is high-pressure gas, and the gas can be collected before the exhaust pipe reaches the throttling method by utilizing the pressure difference characteristic.

The following further describes a specific process of monitoring the temperature of the second gas tank in the refrigerant recovery process with reference to a schematic flow chart of an embodiment of monitoring the temperature of the second gas tank in the refrigerant recovery process in the method of the present invention shown in fig. 5, and the specific process can include: step S210 and step S220.

Step S210, in the process of controlling the air conditioner to recover the refrigerant, obtaining the temperature of the second air tank 5.

Step S220, a second one-way valve 4 is further arranged in the high-pressure gas pipeline of the air conditioner and the low-pressure gas pipeline of the air conditioner, and if the temperature of the second gas storage tank 5 is lower than a set temperature, the second one-way valve 4 is controlled to be in a normally open state. And if the temperature of the second air storage tank 5 is greater than or equal to the set temperature, controlling the second one-way valve 4 to be in a normally closed state. Wherein, the second air storage tank 5 is arranged at the fluid inlet end of the second one-way valve 4, and the first air storage tank 3 is arranged at the fluid outlet end of the second one-way valve 4.

At step S160, if the difference between the first exhaust pressure and the set exhaust pressure is greater than or equal to the lower limit of the set pressure range and less than or equal to the upper limit of the set pressure range, controlling the air conditioner to continue to operate.

In the process of supplementing the refrigerant, after the air conditioner is controlled to supplement the refrigerant for a second set time period, stopping controlling the air conditioner to supplement the refrigerant, controlling the air conditioner to continue to operate, re-determining the magnitude relation between the first exhaust pressure and the corresponding set exhaust pressure at the outdoor environment temperature after the first set time period, re-controlling the refrigerant quantity of the air conditioner according to the re-determined magnitude relation, continuing to supplement the refrigerant if the re-determined magnitude relation indicates that the refrigerant still needs to be supplemented, continuing to operate if the re-determined magnitude relation indicates that the refrigerant does not need to be supplemented and the refrigerant does not need to be recovered, and continuing to recover the refrigerant if the re-determined magnitude relation indicates that the refrigerant needs to be recovered, and sequentially circulating.

In the control process of refrigerant recovery, after controlling the air conditioner to perform refrigerant recovery for a third set time period, stopping controlling the air conditioner to perform refrigerant recovery, controlling the air conditioner to continue to operate, re-determining the magnitude relation between the first exhaust pressure and the corresponding set exhaust pressure at the outdoor environment temperature after the first set time period, re-controlling the refrigerant quantity of the air conditioner according to the re-determined magnitude relation, if the re-determined magnitude relation indicates that the refrigerant still needs to be supplemented, continuing to supplement the refrigerant, if the re-determined magnitude relation indicates that the refrigerant does not need to be supplemented and does not need to be recovered, continuing to recover the refrigerant, and sequentially circulating.

In the normal operation control process, after the air conditioner is controlled to continuously operate for a certain time such as a first set time, the magnitude relation between the first exhaust pressure and the corresponding set exhaust pressure at the outdoor environment temperature is determined again, the refrigerant quantity of the air conditioner is controlled again according to the determined magnitude relation, if the determined magnitude relation indicates that the refrigerant still needs to be supplemented, the refrigerant is continuously supplemented, if the determined magnitude relation indicates that the refrigerant does not need to be supplemented and does not need to be recovered, the air conditioner continues to operate, and if the determined magnitude relation indicates that the refrigerant needs to be recovered, the refrigerant continues to be recovered, and the air conditioner is circulated in sequence.

From this, through temperature sensor, pressure sensor, feedback to the controller but analytic system refrigerant state, accessible controller feedbacks to the display panel this moment, through appointed code, reminds user's air conditioner refrigerant state, and when the refrigerant was not enough, user's accessible stop valve supplyed the refrigerant to the gas holder. Meanwhile, the air storage tank can contain the refrigerant, so that the refrigerant filling amount of the system cannot be directly influenced, and a user can supplement the refrigerant with specific capacity of the air storage tank without methods such as a pressure gauge and the like.

And under the outdoor environment temperature, namely under the condition that the outdoor environment temperature is constant, if the number of times of controlling the air conditioner to supplement the refrigerant or controlling the air conditioner to recover the refrigerant reaches a set number of times, initiating a reminding message of the air conditioner fault, and supplementing air by controlling an outdoor unit switch of the air conditioner.

Since the processing and functions implemented by the method of this embodiment substantially correspond to the embodiments, principles and examples of the air conditioner, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.

Through a large amount of tests verification, adopt the technical scheme of this embodiment, detect through the pressure value to the exhaust interval through utilizing pressure sensor, feed back to the analysis of controller and inhale, receive gas automated operation, realize the purpose of the different cold volume of different operating modes, can adapt to the different requirements to system refrigerant perfusion volume under the different operating modes.

In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.

The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A refrigerant amount control device, comprising: the device comprises a collecting unit and a control unit; wherein the content of the first and second substances,

the acquisition unit is configured to acquire the outdoor environment temperature of the air conditioner;

the acquisition unit is further configured to acquire a first exhaust pressure of an exhaust pipe of the air conditioner after the air conditioner operates for a first set time period;

the control unit is configured to determine the magnitude relation between the first exhaust pressure and the corresponding set exhaust pressure at the outdoor environment temperature;

if the difference value between the first exhaust pressure and the set exhaust pressure is smaller than the lower limit of the set pressure range, controlling the air conditioner to supplement the refrigerant;

if the difference value between the first exhaust pressure and the set exhaust pressure is larger than the upper limit of the set pressure range, controlling the air conditioner to recover the refrigerant;

and if the difference between the first exhaust pressure and the set exhaust pressure is greater than or equal to the lower limit of the set pressure range and less than or equal to the upper limit of the set pressure range, controlling the air conditioner to continuously operate.

2. The apparatus as claimed in claim 1, wherein the control unit controls the air conditioner to perform refrigerant replenishment, and comprises:

arranging a first one-way valve (2) in a low-pressure gas pipeline of the air conditioner, controlling the first one-way valve (2) to be opened, and supplementing a refrigerant into the low-pressure gas pipeline by utilizing a first gas storage tank (3) arranged at a fluid inlet end of the first one-way valve (2);

wherein the low pressure gas line comprises: the air conditioner comprises a suction pipe (1) or a low-pressure pipeline between an outdoor unit of the air conditioner and the first air storage tank (3).

3. The apparatus for controlling an amount of refrigerant according to claim 1, wherein the control unit controls the air conditioner to recover the refrigerant, and includes:

arranging a second one-way valve (4) and a third one-way valve (6) in a high-pressure gas pipeline of the air conditioner and a low-pressure gas pipeline of the air conditioner, controlling the second one-way valve (4) and the third one-way valve (6) to be opened, and recovering a refrigerant in the high-pressure gas pipeline of the air conditioner by utilizing a fluid outlet end of the third one-way valve (6), a second gas storage tank (5) arranged at a fluid inlet end of the second one-way valve (4) and a first gas storage tank (3) arranged at a fluid outlet end of the second one-way valve (4);

wherein, the high-pressure gas pipeline includes: an exhaust pipe (7) of the air conditioner, or a high-pressure pipeline between a compressor exhaust port pipe section of the air conditioner and a throttling device of the air conditioner;

under the condition that the space of the outdoor unit of the air conditioner is smaller than a set value, a first one-way valve (2) is arranged in a low-pressure gas pipeline of the air conditioner, and a suction port of a first air storage tank (3) arranged at a fluid inlet end of the first one-way valve (2) is increased or the volume of the suction port is increased, so that the first air storage tank (3) is utilized to increase the conveying amount of refrigerant in the low-pressure gas pipeline to realize refrigerant recovery.

4. The apparatus for controlling an amount of refrigerant according to claim 3, wherein the control unit controls the air conditioner to recover the refrigerant, and further comprises:

the acquisition unit is also configured to acquire the temperature of the second air storage tank (5) in the process of controlling the air conditioner to recover the refrigerant;

the control unit is also used for arranging a second one-way valve (4) in a high-pressure gas pipeline of the air conditioner and a low-pressure gas pipeline of the air conditioner, and if the temperature of the second gas storage tank (5) is lower than a set temperature, the second one-way valve (4) is controlled to be in a normally open state; if the temperature of the second air storage tank (5) is greater than or equal to the set temperature, controlling the second one-way valve (4) to be in a normally closed state; wherein the second air storage tank (5) is arranged at the fluid inlet end of the second one-way valve (4), and the first air storage tank (3) is arranged at the fluid outlet end of the second one-way valve (4).

5. The refrigerant amount control device according to any one of claims 1 to 4, further comprising:

the control unit is further configured to control the air conditioner to continue to operate after controlling the air conditioner to perform refrigerant supplement for a second set time period, and to re-determine the magnitude relation between the first exhaust pressure and the corresponding set exhaust pressure at the outdoor environment temperature after the first set time period;

the control unit is further configured to control the air conditioner to continue to operate after controlling the air conditioner to perform refrigerant recovery for a third set time period, and to re-determine the magnitude relation between the first exhaust pressure and the corresponding set exhaust pressure at the outdoor environment temperature after the first set time period;

the control unit can be further configured to re-determine the magnitude relation between the first exhaust pressure and the corresponding set exhaust pressure at the outdoor ambient temperature after controlling the air conditioner to continue to operate for a certain time, such as a first set time period.

6. The refrigerant amount control device according to claim 5, further comprising:

the control unit is further configured to initiate a warning message of the air conditioner fault and supplement air by controlling an outdoor unit switch of the air conditioner if the number of times of controlling the air conditioner to supplement refrigerants or controlling the air conditioner to recover refrigerants reaches a set number of times at the outdoor environment temperature.

7. An air conditioner, comprising: the cooling medium amount control device according to any one of claims 1 to 6.

8. A refrigerant quantity control method of an air conditioner is characterized by comprising the following steps:

acquiring the outdoor environment temperature of the air conditioner;

after the air conditioner runs for a first set time, acquiring a first exhaust pressure of an exhaust pipe of the air conditioner;

determining a magnitude relationship between the first exhaust pressure and a corresponding set exhaust pressure at the outdoor ambient temperature;

9. The refrigerant quantity control method according to claim 8, wherein controlling the air conditioner to perform refrigerant replenishment includes:

10. The refrigerant quantity control method according to claim 9, wherein controlling the air conditioner to recover the refrigerant includes:

wherein, the high-pressure gas pipeline includes: an exhaust pipe (7) of the air conditioner, or a high-pressure pipeline from a compressor exhaust port pipe section of the air conditioner to a throttling method of the air conditioner;

11. The refrigerant quantity control method according to claim 10, wherein the method of controlling the air conditioner to recover the refrigerant further comprises:

in the process of controlling the air conditioner to recover the refrigerant, the temperature of the second air storage tank (5) is obtained;

a second one-way valve (4) is further arranged in the high-pressure gas pipeline of the air conditioner and the low-pressure gas pipeline of the air conditioner, and if the temperature of the second gas storage tank (5) is lower than a set temperature, the second one-way valve (4) is controlled to be in a normally open state; if the temperature of the second air storage tank (5) is greater than or equal to the set temperature, controlling the second one-way valve (4) to be in a normally closed state; wherein the second air storage tank (5) is arranged at the fluid inlet end of the second one-way valve (4), and the first air storage tank (3) is arranged at the fluid outlet end of the second one-way valve (4).

12. The refrigerant quantity control method according to any one of claims 9 to 11, further comprising:

after controlling the air conditioner to supplement refrigerant for a second set time period, controlling the air conditioner to continuously operate, and after the first set time period, re-determining the magnitude relation between the first exhaust pressure and the corresponding set exhaust pressure at the outdoor environment temperature;

after controlling the air conditioner to perform refrigerant recovery for a third set time period, controlling the air conditioner to continue to operate, and after the first set time period, re-determining the magnitude relation between the first exhaust pressure and the corresponding set exhaust pressure at the outdoor environment temperature;

and after controlling the air conditioner to continuously operate for a certain time, such as a first set time period, re-determining the magnitude relation between the first exhaust pressure and the corresponding set exhaust pressure at the outdoor environment temperature.

13. The refrigerant quantity control method according to claim 12, further comprising:

and if the air conditioner is controlled to supplement the refrigerant or the number of times of recovering the refrigerant reaches a set number of times, initiating a warning message of the air conditioner fault and supplementing air by controlling an outdoor unit switch of the air conditioner at the outdoor environment temperature.