CN113587336B - Low temperature refrigeration continuous operation control method, device and air conditioner of air conditioner - Google Patents

Abstract

The invention provides a low-temperature refrigeration continuous operation control method, device and air conditioner for an air conditioner. The method includes: in the case of low-temperature refrigeration, obtaining the current operating gear of the fan; if the current operating gear is smaller than a preset gear If the threshold value lasts for a first period of time, the solenoid valve of at least one heat exchange module is closed; the operating gear of the fan is controlled according to the high pressure pressure and whether to close more solenoid valves of the heat exchange module. The present invention can control the electromagnetic valve and the gear position of the outdoor fan in linkage under the condition of low temperature refrigeration, so as to achieve the purpose of continuous and stable operation of the outdoor fan, thereby reducing the fluctuation of the outlet air temperature and the degree of noise change, and improving the user's comfortable experience.

Description

Air conditioner low temperature refrigeration continuous operation control method, device and air conditioner

technical field

The present invention relates to the technical field of air conditioners, in particular to a method and device for controlling continuous operation of low-temperature refrigeration of an air conditioner and an air conditioner.

Background technique

At present, when the air conditioner is cooling at low ambient temperature, due to the small load demand, the heat exchanger of the outdoor unit is too large. When the frequency of the compressor and the wind speed of the outdoor fan are adjusted to the minimum, the load demand is still exceeded, and the outdoor fan can only be stopped to meet the demand. However, there is no heat exchange after the outdoor fan is stopped. As time goes by, the load demand cannot be met, and the outdoor fan must be turned on to meet the load demand, forming a periodic fan start and stop operation.

The periodic start and stop of the fan causes the temperature of the air outlet of the air conditioner to fluctuate and the noise changes significantly, which affects the user's comfortable experience.

Contents of the invention

The problem solved by the invention is the problem that the outdoor fan of the existing air conditioner periodically starts and stops, which causes the temperature fluctuation of the air outlet of the air conditioner, and the noise changes significantly.

In order to solve the above problems, the present invention provides a method for controlling continuous operation of an air conditioner with low-temperature refrigeration. The outdoor unit heat exchanger of the air conditioner includes a plurality of heat exchange modules, and each heat exchange module is provided with a solenoid valve to control the flow path. On and off; the method includes: in the case of low-temperature refrigeration, obtaining the current operating gear of the fan; if the current operating gear is less than the preset gear threshold and lasts for a first duration, then turning off at least one of the heat exchange modules The solenoid valve; according to the high pressure, control the operating gear of the fan and whether to close more solenoid valves of the heat exchange module.

In the present invention, the heat exchanger of the outdoor unit is provided with a plurality of solenoid valves for block control, so that the multi-module heat exchanger can be independent, and the heat exchange can be carried out in blocks. In the case of low-temperature refrigeration, the solenoid valve and the gear position of the outdoor fan can be controlled in conjunction to achieve continuous and stable outdoor fans. The purpose of operation is to reduce the temperature fluctuation of the outlet air and the degree of noise change, and to improve the user's comfort experience.

Optionally, if the outdoor ambient temperature is less than or equal to the first outer ring temperature and greater than the second outer ring temperature, the operation gear of the fan and whether to close more electromagnetic valves of the heat exchange modules are controlled according to the high pressure , including: if the high pressure is greater than the first pressure threshold, then controlling the operating gear of the fan to operate at the average value of the current operating gear and the maximum operating gear; if the high pressure is greater than the second pressure threshold and less than or equal to The first pressure threshold, then control the operating gear of the fan to operate at the first high pressure as the target high pressure; the first high pressure is the average value of the first pressure threshold and the second pressure threshold; if the high pressure If the pressure is less than or equal to the second pressure threshold, the number of closing solenoid valves of the heat exchange module is increased.

The invention can control the electromagnetic valve and the gear position of the outdoor fan in linkage to achieve the purpose of continuous and stable operation of the outdoor fan.

Optionally, after increasing the closing number of the solenoid valve of the heat exchange module, the method further includes: after running for a second period of time, if the high pressure is greater than the second pressure threshold, controlling the fan The operating gear is operated at a quarter of the sum of the current operating gear and the maximum operating gear; if the high pressure is greater than the third pressure threshold and less than or equal to the second pressure threshold, then control the The operating gear of the fan is operated with the second high pressure as the target high pressure; the second high pressure is the average value of the second pressure threshold and the third pressure threshold; if the high pressure is less than or equal to the third pressure Threshold, then control the operating gear of the fan to run at the lowest gear, close the solenoid valves of all the heat exchange modules, and control the periodic opening and closing of the solenoid valves of at least one heat exchange module.

The invention can control the electromagnetic valve and the gear position of the outdoor fan in linkage to achieve the purpose of continuous and stable operation of the outdoor fan.

Optionally, if the outdoor ambient temperature is lower than the second outer ring temperature, the controlling the operating gear of the fan and whether to close more electromagnetic valves of the heat exchange modules according to the high pressure includes: if the high pressure If the pressure is greater than the second pressure threshold, the operating gear of the fan is controlled to operate at a quarter of the sum of the current operating gear and the maximum operating gear; if the high pressure is greater than the third pressure threshold and less than or equal to the The second pressure threshold, then control the operating gear of the fan to operate at the second high pressure as the target high pressure; the second high pressure is the average value of the second pressure threshold and the third pressure threshold; if the high pressure is less than or equal to the third pressure threshold, then control the operating gear of the fan to run at the lowest gear, close the solenoid valves of all the heat exchange modules, and control the solenoid valves of at least one heat exchange module periodically Opening and closing.

The invention can control the electromagnetic valve and the gear position of the outdoor fan in linkage to achieve the purpose of continuous and stable operation of the outdoor fan.

Optionally, before closing at least one solenoid valve of the heat exchange module, the method further includes: obtaining the operating frequency of the compressor; if the operating frequency is greater than the minimum operating frequency, controlling the compressor to run at reduced frequency ; If the operating frequency is equal to the minimum operating frequency, then execute the step of closing the solenoid valve of at least one of the heat exchange modules.

The invention can control the operation frequency of the compressor, the electromagnetic valve and the gear position of the outdoor fan in linkage, so as to achieve the purpose of continuous and stable operation of the outdoor fan.

Optionally, the method further includes: obtaining an outdoor ambient temperature; if the outdoor ambient temperature is less than or equal to the first outer ambient temperature and the device is running in a cooling mode, then it is determined as the low-temperature cooling condition.

The invention provides a method for determining low-temperature refrigeration conditions, can accurately determine whether to execute each step of the continuous operation control method, and improves the control efficiency of the outdoor unit.

Optionally, the value range of the first pressure threshold is greater than or equal to 24bar, or, the value range of the second pressure threshold is 18-24bar, or, the value range of the third pressure threshold is 15 -17 bar.

The invention provides the value range of each parameter, can provide a control basis, and improves the continuous operation stability of the outdoor fan.

The present invention provides a low-temperature refrigeration continuous operation control device for an air conditioner. The outdoor unit heat exchanger of the air conditioner includes a plurality of heat exchange modules, and each heat exchange module is equipped with a solenoid valve to control the flow path on and off; The device includes: a wind gear acquisition module, used to acquire the current operating gear of the fan in the case of low-temperature cooling; a heat exchange control module, used to, if the current operating gear is less than a preset gear threshold and lasts for a first duration, Then close at least one solenoid valve of the heat exchange module; a linkage control module is used to control the operating gear of the fan and whether to close more solenoid valves of the heat exchange module according to the high pressure.

The present invention provides an air conditioner, including a computer-readable storage medium storing a computer program and a processor. When the computer program is read and run by the processor, the above method for controlling the continuous operation of low-temperature cooling of the air conditioner is realized.

The present invention provides a computer-readable storage medium. The computer-readable storage medium stores a computer program. When the computer program is read and executed by a processor, the above method for controlling the continuous operation of low-temperature refrigeration of an air conditioner is realized.

The low-temperature refrigeration continuous operation control device of the air conditioner, the air conditioner and the computer-readable storage medium of the present invention can achieve the same technical effect as the above-mentioned low-temperature refrigeration continuous operation control method of the air conditioner.

Description of drawings

Fig. 1 is the structural representation of outdoor unit of the present invention;

Fig. 2 is a schematic flowchart of a method for controlling continuous operation of low-temperature refrigeration of an air conditioner in an embodiment of the present invention;

3 is a schematic flow chart of another method for controlling the continuous operation of low-temperature refrigeration of an air conditioner in an embodiment of the present invention;

Fig. 4 is a structural schematic diagram of a low-temperature refrigeration continuous operation control device for an air conditioner in an embodiment of the present invention.

Explanation of reference signs:

401-wind gear acquisition module; 402-heat exchange control module; 403-linkage control module.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Fig. 1 is a structural schematic diagram of the outdoor unit of the present invention. The outdoor unit heat exchanger HEx includes three heat exchange modules for illustration. The flow of each heat exchange module is respectively provided with solenoid valves GV1, GV2, and GV3. Figure 1 also shows the ambient temperature sensing package Tao of the external machine, the compressor Comp, the four-way valve 4way, the return pipe PipeL, the exhaust pipe PipeG and two fans Fan1 and Fan2.

The ambient temperature sensor of the external unit is used to detect the outdoor ambient temperature Tao, the exhaust temperature sensor is used to detect the temperature Td, the return air temperature sensor is used to detect the temperature Ts, the high pressure pressure sensor is used to detect the high pressure Pd, and the corresponding high pressure saturation temperature Tpd, Outdoor fan gear Fs. Under normal operating conditions, the solenoid valve is fully open, the maximum fan gear Fs-max, the lowest fan gear Fs-min, the fan gear adjustment coefficient α, and the value range of α is 1/5≤α≤1/2 , eg α=1/3.

The air conditioner periodically detects the above parameters when it is running, usually k seconds is a cycle, 20≤k≤40, for example, k is 30 seconds, if the value of k is 30 seconds, if it is too long, the control response will not be timely and abnormal protection will occur, if it is too short, the control action will be too fast. Frequently lead to overshoot and poor stability.

The heat transfer effect of the outdoor unit is determined by two components: the heat transfer area of the condenser (condenser size) and the speed of the outdoor fan (air volume). The heat exchange effect of the outdoor unit is related to the high pressure: the better the heat exchange, the more sufficient the heat exchange of the refrigerant in the condenser, the greater the drop in the high pressure pd; the worse the heat exchange, the worse the heat exchange of the refrigerant in the condenser, the higher the pressure The pressure pd drops smaller.

In the cooling mode, the operating position of the fan is automatically adjusted according to the high pressure Pd, as follows: when 16bar(E)≤Pd≤23bar(E), the wind speed is maintained; when Pd<16bar, the fan is maintained for 30s , down to 0; when pd> 28bar, the fan rises to the highest gear. The on-off of the solenoid valve can control the size of the area of the condenser participating in the heat exchange of the system. Therefore, this embodiment adjusts the heat exchange effect of the outdoor unit to match the load demand through linkage control of the operating gear of the fan and the on-off of the solenoid valve, so as to achieve the purpose of continuous and stable operation of the outdoor fan.

Fig. 2 is a schematic flow chart of a method for controlling continuous operation of an air conditioner in low-temperature refrigeration according to an embodiment of the present invention. The above method is applied to the above-mentioned air conditioner, and the outdoor unit heat exchanger of the air conditioner includes a plurality of heat exchange modules. Each heat exchange module is equipped with a solenoid valve to control the on-off of the flow path, including the following steps:

S202. In the case of low-temperature cooling, acquire the current operating gear of the fan.

The air conditioner runs in the cooling mode, the m indoor units are turned on, and the steps of this embodiment are executed one minute after the compressor is started. Wherein, 10≤a1≤20, for example, the value of a1 is 15. The current operating gear of the fan is represented by the maximum fan gear Fs-max and the fan gear adjustment coefficient α, which is αFs-max.

Optionally, by comparing the outdoor ambient temperature with a preset ambient temperature threshold, it can be determined whether it is operating under low-temperature refrigeration. Firstly, the outdoor ambient temperature is acquired; then, if the outdoor ambient temperature is less than or equal to the first outer ring temperature and the cooling mode is operated, it is determined as a low-temperature cooling condition.

In the case of non-low temperature cooling, the outdoor fan is normally controlled according to the target high pressure Pd.

S204, if the current operating gear is less than the preset gear threshold and lasts for a first duration, then close the solenoid valve of at least one heat exchange module.

The preset gear threshold is a small gear value within the range of the fan's operating gear. When the threshold is lower than the threshold, the wind gear is already in a lower state, and if the gear is further lowered, the fan will easily stop completely. The heat exchange effect of the outdoor unit can be reduced by reducing the heat exchange area. Through the linkage control of the fan gear and the solenoid valve of the outdoor unit heat exchange module, the purpose of continuous and stable operation of the outdoor fan is achieved.

In order to improve the accuracy of the judgment, the judgment condition of the duration is also set. If the current running gear detected within a certain period of time is less than the preset gear threshold, it is judged that the gear of the outdoor fan has been adjusted to a small value, but the If the load demand is still exceeded, the heat exchange area can be reduced by closing the solenoid valve of the heat exchange module.

Wherein, after the solenoid valve is closed, the corresponding heat exchange module stops the heat exchange function. If there are n heat exchange modules with the same heat exchange area, when the air volume is constant, closing a solenoid valve is equivalent to reducing the heat exchange area of the condenser by 1/n, and the more the number of closed solenoid valves, the smaller the heat transfer amount . Taking the aforementioned three heat exchange modules as an example, one solenoid valve GV1 can be closed.

After at least one solenoid valve is closed, the high pressure Pd of the system will increase, and then the fan speed can be controlled to continue to run within a reasonable and stable range, thereby preventing the fan shutdown from affecting the heat exchange effect of the system, and avoiding air temperature fluctuations in the air conditioner. Problems with significant noise variations.

S206. Control the operating gear of the fan and whether to close the solenoid valves of more heat exchange modules according to the high pressure.

After the solenoid valve is closed, the high pressure will rise, and the operating gear of the fan can be further controlled in real time according to the high pressure, and more heat exchange modules can be further closed as needed.

In order to finely control the operating gear of the fan and the solenoid valve, when the outdoor ambient temperature is less than or equal to the temperature of the first outer ring, it can be further divided into two ranges according to the size of the outdoor ambient temperature, namely the outdoor environment The temperature is less than or equal to the first outer ring temperature and greater than the second outer ring temperature, and the outdoor ambient temperature is lower than the second outer ring temperature, and different operating gears and solenoid valve control strategies are implemented for the above two ranges.

Optionally, if the outdoor ambient temperature is less than or equal to the first outer ring temperature and greater than the second outer ring temperature, the operating gear and solenoid valve control are performed according to the following steps:

(1) If the high pressure is greater than the first pressure threshold A, the operating gear of the fan is controlled to operate at the average value of the current operating gear αFs-max and the maximum operating gear Fs-max. When Pd>A, the gear of the external fan operates according to Fs=(Fs-max+αFs-max)/2.

(2) If the high pressure is greater than the second pressure threshold B and less than or equal to the first pressure threshold A, the operating gear of the fan is controlled to operate with the first high pressure as the target high pressure Pd. The first high pressure is the average value of the first pressure threshold and the second pressure threshold. When B<Pd≤A, the gear position of the external fan is automatically controlled according to the target high pressure Pd=(A+B)/2.

(3) If the high pressure is less than or equal to the second pressure threshold B, increase the number of closing solenoid valves of the heat exchange module. For example, when Pd≤B, a solenoid valve GV2 is closed. In the above case where only GV1 is closed, the load demand is still exceeded, and the heat exchange area of the condenser needs to be further reduced.

After increasing the closing number of the electromagnetic valves of the heat exchange modules, it is possible to continue to adjust the operating gear of the fan, and to control the closing of more electromagnetic valves of the heat exchange modules until all the electromagnetic valves are closed. Based on this, the following steps may also be included:

After the second period of operation, if the high pressure is greater than the second pressure threshold B, the operating gear of the fan is controlled to operate at a quarter of the sum of the current operating gear and the maximum operating gear. When Pd>B, the gear of the external fan operates according to Fs=(Fs-max+αFs-max)/4.

If the high pressure is greater than the third pressure threshold C and less than or equal to the second pressure threshold B, the fan is controlled to operate at the second high pressure as the target high pressure. The second high pressure is the average value of the second pressure threshold and the third pressure threshold. When C≤Pd≤B, the gear position of the external fan is automatically controlled according to the target high pressure Pd=(B+C)/2.

If the high pressure is less than or equal to the third pressure threshold C, then close the solenoid valves of all the heat exchange modules, and control the periodic opening and closing of the solenoid valves of at least one heat exchange module. When Pd<C, the solenoid valve GV3 performs frequent opening and closing actions. Even after the solenoid valves GV1 and GV2 are closed, the load demand is still exceeded, but the condenser cannot completely stop the refrigerant flow. GV3 can be started and stopped periodically to control the amount of refrigerant, and the outdoor fan gear operates at the lowest gear Fs-min.

Optionally, if the outdoor ambient temperature is lower than the second outer ring temperature, the operating gear and solenoid valve control are performed according to the following steps:

(1) If the high pressure is greater than the second pressure threshold, the operating gear of the fan is controlled to operate at a quarter of the sum of the current operating gear and the maximum operating gear.

(2) If the high pressure is greater than the third pressure threshold and less than or equal to the second pressure threshold, then the operating gear of the fan is controlled with the second high pressure as the target high pressure operation; the second high pressure is the difference between the second pressure threshold and the third pressure threshold average value.

(3) If the high pressure is less than or equal to the third pressure threshold, close the solenoid valves of all the heat exchange modules, and control the periodic opening and closing of the solenoid valves of at least one heat exchange module.

The periodic opening and closing (start and stop) of the solenoid valve is as follows: start timing from the closed state of power failure, turn on the power to the ON connection state after k seconds, and count as a start and stop cycle (m+1)k after continuous operation for mk seconds. Wherein, m≥2, for example, m is 3, and 3≤k≤7, for example, k is 5.

It should be noted here that the above-mentioned determination process of the operating gear is performed based on system stability and optimal heat exchange of the external unit.

After closing the solenoid valve GV1, if Pd>A, the high pressure suddenly increases just after closing the solenoid valve GV1. It is necessary to increase the fan speed, increase the air volume and increase the heat exchange effect to reduce the high pressure to a stable value. However, if the operating gear of the fan is increased too much, it is easy to cause the high pressure to drop sharply, causing the system to fluctuate violently. Therefore, the operating wind gear is selected at a reasonable value (αFs-max<Fs<Fs-max), for example, the aforementioned Fs= (Fs-max+αFs-max)/2, can make rough adjustment to the system high pressure. If B<Pd≤A, in order to ensure the stable operation of the external fan speed, the high-pressure pressure is in an appropriate range. At this time, a reasonable target high-pressure value can be set for automatic adjustment, and the gear position of the external fan can be fine-tuned according to this target high-pressure value. , for example, select the target high voltage Pd=(A+B)/2.

After closing the solenoid valves GV1 and GV2, compared with the situation of closing the solenoid valve GV1 above, the actual load demand is smaller. After closing the two solenoid valves, there is still a problem of exceeding the load demand. The operating gear of the fan is further reduced and Lower the target high pressure further. As mentioned above, if Pd>B, the operating wind gear is selected as Fs=(Fs-max+αFs-max)/4, and the high pressure of the system can be roughly adjusted. If C<Pd≤B, select the target high voltage Pd=(A+B)/2.

Optionally, the value range of the above-mentioned first pressure threshold A is greater than or equal to 24bar, for example, A takes a value of 26bar, the value range of the second pressure threshold B is 18-24bar, for example, B takes a value of 22bar, and the third pressure threshold C The range of value is 15-17bar, for example, the value of C is 16bar.

In the low-temperature cooling continuous operation control method of the air conditioner provided in this embodiment, the heat exchanger of the outdoor unit is provided with multiple electromagnetic valves for block control, so that the heat exchangers are multi-module independent, and the heat exchange is block-by-block, and the solenoid valves can be controlled in conjunction with low-temperature cooling. , Outdoor fan gear, to achieve the purpose of continuous and stable operation of the outdoor fan, thereby reducing the temperature fluctuation of the outlet air and the degree of noise change, and improving the user's comfort experience.

Considering that the operating frequency of the compressor is also an important factor affecting the heat exchange effect of the outdoor unit, before closing the solenoid valve of at least one heat exchange module, it can be checked whether the operating frequency has been reduced to the minimum. Based on this, the above method also includes the following steps :

Obtain the operating frequency of the compressor; if the operating frequency is greater than the minimum operating frequency, control the compressor to run at reduced frequency; if the operating frequency is equal to the minimum operating frequency, perform the step of closing the solenoid valve of at least one heat exchange module.

When there is room for reducing the operating frequency, the operating frequency can be reduced preferentially, thereby reducing the heat exchange effect and reducing power consumption.

Referring to the schematic flowchart of a method for controlling continuous operation of low-temperature refrigeration of an air conditioner shown in FIG. 2 , it includes the following steps:

S301, detecting the temperature Tao of the outer ring. If Tao>T1, execute S302; if T2<Tao≦T1, execute S303; if Tao≦T2, execute S308. Wherein, 20≤T1≤30, for example, T1 is 25°C; 5≤T2≤15, for example, T2 is 10°C.

S302, the outdoor fan is normally controlled according to the target high pressure Pd.

S303, when it is detected that the fan operating gear Fs>αFs-max is detected continuously for a2 minutes, the system is under normal control. Wherein, 1≤a1≤5, for example, a2 is 3, 1/5≤α≤1/2, for example, α is 1/3.

S304, when it is detected that the fan running gear Fs≤αFs-max is detected continuously for a2 minutes, the electromagnetic valve GV1 is closed, and the outdoor fan gear Fs is controlled in real time according to the high pressure Pd.

S305, when Pd>A, the gear of the external fan operates according to Fs=(Fs-max+αFs-max)/2.

S306, when B<Pd≤A, the gear position of the external fan is automatically controlled according to the target high pressure Pd=(A+B)/2.

S307, when Pd≤B, close the electromagnetic valve GV2. And, further execute S309.

S308, when it is detected that the fan operating gear Fs>αFs-max is detected continuously for a2 minutes, the system is under normal control.

S309, when it is detected that the fan operating gear position Fs≤αFs-max lasts for a2 minutes, the solenoid valves GV1 and GV2 are closed, and the outdoor fan gear position Fs is controlled in real time according to the high pressure Pd.

S310, when Pd>B, the gear of the external fan operates according to Fs=(Fs-max+αFs-max)/4

S311, when C≤Pd≤B, the gear position of the external fan is automatically controlled according to the target high pressure Pd=(B+C)/2.

S312, when Pd<C, the solenoid valve GV3 performs frequent switching actions, and the gear of the outdoor fan operates at the lowest gear Fs-min.

In the above method provided in this embodiment, by setting segmented electromagnetic valve control on the outdoor unit heat exchanger, the multi-module independence of the heat exchanger is realized, and the block heat exchange is realized according to the scene; by dividing the outdoor ambient temperature and high pressure, The linkage control of the solenoid valve switch of the outdoor unit, the frequency of the outdoor unit, and the gear position of the outdoor fan achieves the purpose of continuous and stable operation of the outdoor fan.

Fig. 3 is a structural schematic diagram of an air conditioner low-temperature refrigeration continuous operation control device in an embodiment of the present invention, the outdoor unit heat exchanger of the air conditioner includes a plurality of heat exchange modules, and each heat exchange module is provided with The solenoid valve controls the on-off of the flow path; the device includes:

The wind gear acquisition module 401 is used to acquire the current operating gear of the fan under the condition of low-temperature cooling;

A heat exchange control module 402, configured to close at least one solenoid valve of the heat exchange module if the current operating gear is less than a preset gear threshold and lasts for a first duration;

The linkage control module 403 is used to control the operating gear of the fan and whether to close more solenoid valves of the heat exchange modules according to the high pressure.

In the low-temperature refrigeration continuous operation control device of the air conditioner provided in this embodiment, the heat exchanger of the outdoor unit is provided with a plurality of electromagnetic valves for block control, so that the multi-module heat exchanger is independent and the heat exchange is block-by-block, and the solenoid valves can be controlled in conjunction with low-temperature refrigeration. , Outdoor fan gear, to achieve the purpose of continuous and stable operation of the outdoor fan, thereby reducing the temperature fluctuation of the outlet air and the degree of noise change, and improving the user's comfort experience.

Optionally, as an example, if the outdoor ambient temperature is less than or equal to the first outer ring temperature and greater than the second outer ring temperature, the linkage control module 303 is specifically used to:

If the high pressure is greater than the first pressure threshold, the operating gear of the fan is controlled to run at the average value of the current operating gear and the maximum operating gear; if the high pressure is greater than the second pressure threshold and less than or equal to the first A pressure threshold, then control the operating gear of the fan to operate at the first high pressure as the target high pressure; the first high pressure is the average value of the first pressure threshold and the second pressure threshold; if the high pressure is less than or If it is equal to the second pressure threshold, the closing quantity of the electromagnetic valve of the heat exchange module is increased.

Optionally, as an embodiment, the linkage control module 303 is also used to:

After running for a second period of time, if the high pressure is greater than the second pressure threshold, control the operating gear of the fan to operate at a quarter of the sum of the current operating gear and the maximum operating gear; If the high pressure is greater than the third pressure threshold and less than or equal to the second pressure threshold, the operating gear of the fan is controlled to operate at the second high pressure as the target high pressure; the second high pressure is the second pressure The average value of the threshold and the third pressure threshold; if the high pressure is less than or equal to the third pressure threshold, control the operating gear of the fan to operate at the lowest gear, and turn off all the heat exchange modules The solenoid valve, and the solenoid valve controlling at least one heat exchange module are opened and closed periodically.

Optionally, as an embodiment, if the outdoor ambient temperature is lower than the second outer ring temperature, the linkage control module 303 is specifically configured to:

If the high pressure is greater than the second pressure threshold, the operating gear of the fan is controlled to run at a quarter of the sum of the current operating gear and the maximum operating gear; if the high pressure is greater than the third pressure threshold and less than or is equal to the second pressure threshold, then control the operating gear of the fan to operate at the second high pressure as the target high pressure; the second high pressure is the average value of the second pressure threshold and the third pressure threshold; if If the high pressure is less than or equal to the third pressure threshold, the operating gear of the fan is controlled to operate at the lowest gear, the solenoid valves of all the heat exchange modules are closed, and the solenoid valves of at least one heat exchange module are controlled Periodic opening and closing.

Optionally, as an embodiment, the linkage control module 303 is also used to:

Obtain the operating frequency of the compressor; if the operating frequency is greater than the minimum operating frequency, control the compressor to run at reduced frequency; if the operating frequency is equal to the minimum operating frequency, perform the step of closing at least one solenoid valve of the heat exchange module .

Optionally, as an embodiment, a low temperature refrigeration judging module is also included for:

Acquiring the outdoor ambient temperature; if the outdoor ambient temperature is less than or equal to the first outer ring temperature and is running in cooling mode, it is determined as the low-temperature cooling condition.

Optionally, as an embodiment, the value range of the first pressure threshold is greater than or equal to 24 bar, or, the value range of the second pressure threshold is 18-24 bar, or, the value range of the third pressure threshold is The value range is 15-17bar.

An embodiment of the present invention also provides an air conditioner, including a computer-readable storage medium storing a computer program and a processor. When the computer program is read and run by the processor, the above-mentioned air conditioner realizes the low-temperature cooling and continuous operation Control Method.

An embodiment of the present invention also provides a computer-readable storage medium, the computer-readable storage medium stores a computer program, and when the computer program is read and run by a processor, the method provided by the above-mentioned embodiment is implemented, and can To achieve the same technical effect, in order to avoid repetition, no more details are given here. Wherein, the computer-readable storage medium is, for example, a read-only memory (Read-Only Memory, ROM for short), a random access memory (Random Access Memory, RAM for short), a magnetic disk or an optical disk, and the like.

Of course, those skilled in the art can understand that all or part of the processes in the methods of the above-mentioned embodiments can be completed by instructing the control device through a computer program, and the program can be stored in a computer-readable storage medium, so When the program is executed, it may include the processes of the above method embodiments, wherein the storage medium may be a memory, a magnetic disk, an optical disk, and the like.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so the protection scope of the present invention should be based on the scope defined in the claims.

Finally, it should also be noted that in this text, relational terms such as first and second etc. are only used to distinguish one entity or operation from another, and do not necessarily require or imply that these entities or operations, any such actual relationship or order exists. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. For the low-temperature refrigeration continuous operation control device and the air conditioner disclosed in the embodiment, since it corresponds to the low-temperature refrigeration continuous operation control method of the air conditioner disclosed in the above-mentioned embodiment, the description is relatively simple. For relevant information, please refer to the method part Just explain.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so the protection scope of the present invention should be based on the scope defined in the claims.

Claims (8)

1. A method for controlling continuous operation of low-temperature refrigeration of an air conditioner, characterized in that the outdoor unit heat exchanger of the air conditioner includes a plurality of heat exchange modules, and each of the heat exchange modules is provided with a solenoid valve to control the on-off of the flow path ; the method comprising: In the case of low-temperature cooling, obtain the current operating gear of the fan; If the current operating gear is less than a preset gear threshold and lasts for a first duration, then closing at least one solenoid valve of the heat exchange module; Control the operating gear of the fan and whether to close more electromagnetic valves of the heat exchange module according to the high pressure; If the outdoor ambient temperature is less than or equal to the first outer ring temperature and greater than the second outer ring temperature, controlling the operating gear of the fan and whether to close more electromagnetic valves of the heat exchange modules according to the high pressure includes: If the high pressure is greater than the first pressure threshold, control the operating gear of the fan to operate at the average value of the current operating gear and the maximum operating gear; If the high pressure is greater than the second pressure threshold and less than or equal to the first pressure threshold, then control the operating gear of the fan to operate at the first high pressure as the target high pressure; the first high pressure is the first pressure threshold and the first pressure threshold an average of said second pressure threshold; If the high pressure is less than or equal to the second pressure threshold, increasing the closing number of the electromagnetic valve of the heat exchange module; If the outdoor ambient temperature is lower than the temperature of the second outer ring, controlling the operating gear of the fan and whether to close more electromagnetic valves of the heat exchange module according to the high pressure includes: If the high pressure is greater than the second pressure threshold, control the operating gear of the fan to operate at a quarter of the sum of the current operating gear and the maximum operating gear; If the high pressure is greater than the third pressure threshold and less than or equal to the second pressure threshold, then control the operating gear of the fan to operate with the second high pressure as the target high pressure; the second high pressure is the second pressure threshold and the second pressure threshold an average of said third pressure threshold; If the high pressure is less than or equal to the third pressure threshold, control the operating gear of the fan to operate at the lowest gear, close the electromagnetic valves of all the heat exchange modules, and control the electromagnetic valves of at least one of the heat exchange modules. The valve opens and closes periodically. 2. The method according to claim 1, characterized in that, after increasing the closing quantity of the electromagnetic valve of the heat exchange module, the method further comprises: After running for a second period of time, if the high pressure is greater than the second pressure threshold, control the operating gear of the fan to operate at a quarter of the sum of the current operating gear and the maximum operating gear; If the high pressure is greater than the third pressure threshold and less than or equal to the second pressure threshold, control the operating gear of the fan to operate at a high pressure with the second high pressure as the target; the second high pressure is the first high pressure the average value of the second pressure threshold and the third pressure threshold; If the high pressure is less than or equal to the third pressure threshold, control the operating gear of the fan to operate at the lowest gear, close the solenoid valves of all the heat exchange modules, and control at least one of the heat exchange modules The solenoid valve opens and closes periodically. 3. The method according to claim 1, characterized in that, before the closing of the solenoid valve of at least one of the heat exchange modules, the method further comprises: Obtain the operating frequency of the compressor; If the operating frequency is greater than the minimum operating frequency, the compressor is controlled to reduce frequency; If the operating frequency is equal to the minimum operating frequency, a step of closing the solenoid valve of at least one of the heat exchange modules is performed. 4. The method of claim 1, further comprising: Obtain the outdoor ambient temperature; If the outdoor ambient temperature is less than or equal to the first outer ring temperature and the cooling mode is running, it is determined to be the low-temperature cooling condition. 5. The method according to claim 1, wherein the value range of the first pressure threshold is greater than or equal to 24bar, or, the value range of the second pressure threshold is 18-24bar, or, the The value range of the third pressure threshold is 15-17bar. 6. An air conditioner low-temperature refrigeration continuous operation control device, characterized in that the outdoor unit heat exchanger of the air conditioner includes a plurality of heat exchange modules, and each of the heat exchange modules is equipped with a solenoid valve to control the on-off of the flow path ; the device comprises: The wind gear acquisition module is used to obtain the current operating gear of the fan under the condition of low temperature cooling; A heat exchange control module, configured to close at least one solenoid valve of the heat exchange module if the current operating gear is less than a preset gear threshold and lasts for a first duration; A linkage control module, used to control the operating gear of the fan and whether to close more solenoid valves of the heat exchange module according to the high pressure; If the outdoor ambient temperature is less than or equal to the first outer ring temperature and greater than the second outer ring temperature, the linkage control module is specifically used for: If the high pressure is greater than the first pressure threshold, control the operating gear of the fan to operate at the average value of the current operating gear and the maximum operating gear; If the high pressure is greater than the second pressure threshold and less than or equal to the first pressure threshold, then control the operating gear of the fan to operate at the first high pressure as the target high pressure; the first high pressure is the first pressure threshold and the first pressure threshold an average value of said second pressure threshold; If the high pressure is less than or equal to the second pressure threshold, increasing the closing number of the electromagnetic valve of the heat exchange module; If the outdoor ambient temperature is lower than the second outer ring temperature, the linkage control module is specifically used for: If the high pressure is greater than the second pressure threshold, control the operating gear of the fan to operate at a quarter of the sum of the current operating gear and the maximum operating gear; If the high pressure is greater than the third pressure threshold and less than or equal to the second pressure threshold, then control the operating gear of the fan to operate with the second high pressure as the target high pressure; the second high pressure is the second pressure threshold and the second pressure threshold an average of said third pressure threshold; If the high pressure is less than or equal to the third pressure threshold, control the operating gear of the fan to operate at the lowest gear, close the electromagnetic valves of all the heat exchange modules, and control the electromagnetic valves of at least one of the heat exchange modules. The valve opens and closes periodically. 7. An air conditioner, characterized in that it comprises a computer-readable storage medium and a processor storing a computer program, and when the computer program is read and run by the processor, it can realize any one of claims 1-5. method described in the item. 8. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, and when the computer program is read and run by a processor, the computer program according to any one of claims 1-5 is implemented. described method.

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