CN113091200B

CN113091200B - Air conditioner and control method and device thereof

Info

Publication number: CN113091200B
Application number: CN202110502072.6A
Authority: CN
Inventors: 刘永超; 刘合心; 张稳; 陈体宁
Original assignee: Ningbo Aux Electric Co Ltd; Ningbo Aux Intelligent Commercial Air Conditioning Manufacturing Co Ltd
Current assignee: Aux Air Conditioning Co Ltd; Ningbo Aux Electric Co Ltd
Priority date: 2021-05-08
Filing date: 2021-05-08
Publication date: 2022-04-19
Anticipated expiration: 2041-05-08
Also published as: CN113091200A

Abstract

The invention provides an air conditioner and a control method and device thereof, belonging to the technical field of air conditioners. The four-way valve is communicated with one ends, far away from the compressor, of the first pipeline and the second pipeline simultaneously. One end of the condenser is communicated with the four-way valve, and the other end of the condenser is communicated with one end of the third pipeline. The heat exchange assembly comprises a heat exchanger, a fourth pipeline, a fifth pipeline and a first electronic expansion valve, the heat exchanger comprises a first flow passage and a second flow passage which can exchange heat, the first flow passage is communicated with the second pipeline, two ends of the second flow passage are respectively communicated with one ends of the fourth pipeline and one end of the fifth pipeline, the other ends of the fourth pipeline and the fifth pipeline are respectively communicated with the third pipeline, and the first electronic expansion valve is arranged on the fourth pipeline. The air conditioner control device is used for controlling the air conditioner to execute the air conditioner control method so as to ensure the reliability of the operation of the air conditioner.

Description

Air conditioner and control method and device thereof

Technical Field

The invention relates to the technical field of air conditioners, in particular to an air conditioner, an air conditioner control method and an air conditioner control device.

Background

An Air Conditioner (Air Conditioner) is a device that manually adjusts and controls parameters such as temperature, humidity, and flow rate of ambient Air in a building or structure.

In the process of low-temperature heating operation of the conventional air conditioner, due to the influence of the use environment, the condition of overhigh exhaust temperature or overhigh return air superheat degree can occur, and the reliability of the operation of the air conditioner is influenced.

Disclosure of Invention

The invention solves the problem that the prior air conditioner is unreliable in low-temperature heating operation.

In order to solve the above-mentioned problems,

in a first aspect, the present invention provides an air conditioner comprising:

the air return port of the compressor is communicated with one end of the first pipeline, and the air exhaust port of the compressor is communicated with one end of the second pipeline;

the four-way valve is simultaneously communicated with one ends, far away from the compressor, of the first pipeline and the second pipeline;

one end of the condenser is communicated with the four-way valve, and the other end of the condenser is communicated with one end of a third pipeline;

the heat exchange assembly comprises a heat exchanger, a fourth pipeline, a fifth pipeline and a first electronic expansion valve, the heat exchanger comprises a first flow passage and a second flow passage which can exchange heat, the first flow passage is communicated with the second pipeline, two ends of the second flow passage are respectively communicated with the fourth pipeline and one end of the fifth pipeline, the other end of the fourth pipeline and the other end of the fifth pipeline are respectively communicated with the third pipeline, and the first electronic expansion valve is arranged on the fourth pipeline.

Because the heat exchange assembly is additionally arranged, when the air conditioner is in low-temperature heating operation, a low-temperature refrigerant flowing into the third pipeline from the room flows into the condenser to absorb heat and then enters the compressor through the first pipeline, and then flows into the second channel of the heat exchanger through the fourth pipeline and then returns to the third pipeline again through the fifth pipeline. In the process of flowing through the second channel, the low-temperature refrigerant can absorb the heat of the high-temperature refrigerant in the first channel communicated with the second pipeline, so that the temperature of the refrigerant in the second pipeline is reduced to reduce the exhaust temperature of the air conditioner, the return air superheat degree of the air conditioner can be improved, the phenomenon of liquid impact on the compressor is prevented, and the reliability and the stability of the air conditioner during low-temperature heating operation are improved.

In an optional embodiment, the heat exchange assembly further includes a second electronic expansion valve, and the second electronic expansion valve is disposed on the third pipeline and located between ends of the fourth pipeline and the fifth pipeline far away from the heat exchanger.

In an optional embodiment, the heat exchange assembly further includes a check valve, and the check valve is disposed in the fifth pipeline and is configured to prevent the refrigerant from flowing from the heat exchanger to the third pipeline through the fifth pipeline.

In an alternative embodiment, the heat exchanger is a double pipe heat exchanger or a plate heat exchanger.

In a second aspect, the present invention provides an air conditioner control method for controlling an operation of the air conditioner according to any one of the preceding embodiments, including:

acquiring outdoor environment temperature, exhaust temperature, return air pressure and return air temperature, and calculating the degree of superheat of return air according to the return air pressure and the return air temperature;

and under the condition that the outdoor environment temperature is less than a first threshold value, controlling the opening degree of the first electronic expansion valve according to the exhaust temperature and the return air superheat degree.

According to the air conditioner control method, when the air conditioner with low outdoor environment temperature is in low-temperature heating operation, the opening degree of the first electronic expansion valve is controlled according to the exhaust temperature and the return air superheat degree, so that the flow of the refrigerant in the second flow channel entering the heat exchanger is adjusted, the heat exchange and cooling effects on the refrigerant in the second pipeline are adjusted, the exhaust temperature and the return air superheat degree of the air conditioner can be kept in a proper range, the lost flow efficiency of the refrigerant after being shunted by the heat exchange assembly is reduced as much as possible, and the heating effect of the air conditioner is guaranteed.

In alternative embodiments, the first threshold is T1, the T1 ≦ -7 ℃.

In an alternative embodiment, the step of calculating the degree of superheat of the return air from the return air pressure and the return air temperature comprises:

and calculating the return air superheat degree by a formula of delta Ts-Tps, wherein delta Ts is the return air superheat degree, Ts is the return air temperature, and Tps is the saturation temperature corresponding to the return air pressure.

In an alternative embodiment, the step of controlling the opening degree of the first electronic expansion valve based on the exhaust gas temperature and the return air superheat degree comprises:

under the condition that the exhaust gas temperature is greater than a second threshold value and the return air superheat degree is less than a third threshold value, calculating a target opening degree of the first electronic expansion valve needing to be increased by using a formula P3-K1-P1 + K2-P2, wherein P3 is the target opening degree, K1, P1, K2 and P2 are constants, K1 is greater than or equal to 1 and less than or equal to K2 and less than or equal to 2, P1 is greater than or equal to 5 steps and less than or equal to 15 steps, and P2 is greater than or equal to 10 steps and less than or equal to 20 steps;

and controlling the first electronic expansion valve to increase the opening degree according to the magnitude relation between the target opening degree and the maximum opening degree.

under the condition that the exhaust gas temperature is greater than a second threshold value and the return air superheat degree is greater than or equal to a third threshold value, calculating a target opening degree of the first electronic expansion valve needing to be increased by using a formula P3-K1-P1, wherein P3 is the target opening degree, K1 and P1 are constants, K1 is greater than or equal to 1 and less than or equal to 2, and 5 steps are less than or equal to P1 and less than or equal to 15 steps;

under the condition that the exhaust gas temperature is less than or equal to a second threshold value and the return air superheat degree is less than a third threshold value, calculating a target opening degree of the first electronic expansion valve needing to be increased by using a formula P3-K2-P2, wherein P3 is the target opening degree, K2 and P2 are constants, K2 is greater than or equal to 1 and less than or equal to 2, and P2 is greater than or equal to 10 steps and less than or equal to 20 steps;

In an alternative embodiment, the second threshold is T2+1 and 90 ℃. ltoreq. T2. ltoreq.105 ℃.

In an alternative embodiment, the step of controlling the first electronic expansion valve to increase the opening degree according to the magnitude relationship between the target opening degree and the maximum opening degree comprises:

controlling the first electronic expansion valve to increase the target opening degree when the target opening degree is smaller than the maximum opening degree;

and controlling the first electronic expansion valve to increase the maximum opening degree when the target opening degree is larger than or equal to the maximum opening degree.

In an optional embodiment, the step of controlling the first electronic expansion valve to increase the opening degree further includes:

and controlling the first electronic expansion valve to close after the opening degree of the first electronic expansion valve is increased for preset time.

In an alternative embodiment, in a case where the discharge temperature satisfies a first condition and the return air superheat degree satisfies a second condition, the steps of obtaining the outdoor environment temperature, the discharge temperature, the return air pressure, and the return air superheat degree, and calculating the return air superheat degree from the return air pressure and the return air temperature are repeatedly performed until the discharge temperature does not satisfy the first condition and/or the return air superheat degree does not satisfy the second condition, where the first condition is less than or equal to a second threshold and greater than or equal to a fourth threshold, and the second condition is less than or equal to a fifth threshold and greater than or equal to a third threshold.

In a third aspect, the present invention provides an air conditioner control device for controlling an operation of the air conditioner according to any one of the foregoing embodiments, including:

the acquisition module is used for acquiring outdoor environment temperature, exhaust temperature, return air pressure and return air temperature and calculating the degree of superheat of return air according to the return air pressure and the return air temperature;

and the control module is used for controlling the opening of the first electronic expansion valve according to the exhaust temperature and the return air superheat degree under the condition that the outdoor environment temperature is less than a first threshold value.

When the air conditioner control device is used for heating at a low temperature by an air conditioner with a small outdoor environment temperature, the opening degree of the first electronic expansion valve is controlled according to the exhaust temperature and the return air superheat degree, so that the flow of a refrigerant in the second flow channel entering the heat exchanger is adjusted, the heat exchange and cooling effects of the refrigerant in the second pipeline are adjusted, the exhaust temperature and the return air superheat degree of the air conditioner are kept in a proper range, the flow efficiency of the refrigerant lost after being shunted by the heat exchange assembly is reduced as much as possible, and the heating effect of the air conditioner is ensured.

Drawings

Fig. 1 is a schematic structural diagram of an air conditioner according to a first embodiment of the present invention;

fig. 2 is a control block diagram of an air conditioner according to a first embodiment of the present invention;

fig. 3 is a block diagram of a controller according to a first embodiment of the present invention;

fig. 4 is a flowchart of an air conditioner control method according to a second embodiment of the present invention;

fig. 5 is a flowchart illustrating sub-steps of step S200 according to a second embodiment of the present invention;

fig. 6 is a block diagram of an air conditioning control apparatus according to a third embodiment of the present invention.

Description of reference numerals:

10-air conditioning; 100-a controller; 101-a memory; 102-a communication interface; 103-a processor; 104-a bus; 200-a compressor; 300-a four-way valve; 400-a condenser; 500-a first conduit; 510-a gas-liquid separator; 520-return air pressure sensor; 530-return air temperature sensor; 600-a second pipeline; 610-a high voltage switch; 620 — exhaust temperature sensor; 630-exhaust pressure sensor; 700-third line; 800-a heat exchange assembly; 810-heat exchanger; 812-a first flow channel; 814-a second flow channel; 820-a first electronic expansion valve; 830-a fourth conduit; 840-a fifth pipeline; 850-a second electronic expansion valve; 860-a one-way valve; 900-air-conditioning control device; 910-an acquisition module; 920-control module.

Detailed Description

In the process of low-temperature heating operation of the conventional air conditioner, due to the influence of the use environment, the condition of overhigh exhaust temperature or overhigh return air superheat degree can occur, and the reliability of the operation of the air conditioner is influenced. The air conditioner is characterized in that the air conditioner is provided with a compressor, and the like.

In view of the above circumstances, embodiments of the present invention provide an air conditioner and a method and an apparatus for controlling the air conditioner, which can effectively reduce the exhaust temperature and improve the superheat degree of return air by adding a heat exchange assembly in the existing air conditioner, thereby ensuring the reliability and stability of the air conditioner during low-temperature heating operation.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

The first embodiment:

referring to fig. 1, an air conditioner 10 according to an embodiment of the present invention includes a compressor 200, a condenser 400, a four-way valve 300, a first pipeline 500, a second pipeline 600, a third pipeline 700, and a heat exchange assembly 800.

The return port of compressor 200 communicates with one end of first pipe 500, and the discharge port communicates with one end of second pipe 600. The four-way valve 300 is simultaneously communicated with the first pipeline 500 and one end of the second management pipe 600 far away from the compressor 200, in detail, a first interface D of the four-way valve 300 is communicated with one end of the second pipeline 600 far away from the compressor 200, a second interface E of the four-way valve 300 is communicated with one end of the condenser 400, a third interface S of the four-way valve 300 is communicated with one end of the first pipeline 500 far away from the compressor 200, a fourth interface C of the four-way valve 300 is used for communicating with an evaporator of an indoor unit, one end of the condenser 400 far away from the four-way valve 300 is communicated with one end of the third pipeline 700, and the other end of the third pipeline 700 is also used for communicating with the evaporator of the indoor unit.

The heat exchange assembly 800 comprises a heat exchanger 810, a fourth pipeline 830, a fifth pipeline 840 and a first electronic expansion valve 820, wherein the heat exchanger 810 comprises a first flow passage 812 and a second flow passage 814 capable of exchanging heat, the first flow passage 812 is communicated with the second pipeline 600, two ends of the second flow passage 814 are respectively communicated with one end of the fourth pipeline 830 and one end of the fifth pipeline 840, the other end of the fourth pipeline 830 and the other end of the fifth pipeline 840 are respectively communicated with the third pipeline 700, and the first electronic expansion valve 820 is arranged on the fourth pipeline 830.

In the direction from the four-way valve 300 to the compressor 200, the first pipeline 500 is sequentially provided with a gas-liquid separator 510, an air-return pressure sensor 520, and an air-return temperature sensor 530, the gas-liquid separator 510 is used for separating gaseous and liquid refrigerants and other fluids in the first pipeline 500, the air-return pressure sensor 520 is used for detecting the air-return pressure of the air conditioner 10, and the air-return temperature sensor 530 is used for detecting the air-return temperature of the air conditioner 10.

The number of the second pipes 600 is two, two ends of the first second pipe 600 are respectively communicated with the exhaust port of the compressor 200 and one end of the first flow channel 812 of the heat exchanger 810, and the second pipe 600 is sequentially provided with a high-pressure switch 610, an exhaust temperature sensor 620 and an exhaust pressure sensor 630 in a direction from the compressor 200 to the four-way valve 300. The discharge temperature sensor 620 is used to detect the discharge temperature of the air conditioner 10, and the discharge pressure sensor 630 is used to detect the discharge pressure of the air conditioner 10. Both ends of the second pipe 600 are respectively communicated with the other end of the first flow channel 812 of the heat exchanger 810 and the first port D of the four-way valve 300.

The heat exchanger 810 may be of different types as required, and in this embodiment, the heat exchanger 810 is a double pipe heat exchanger 810. In other embodiments, the heat exchanger 810 may also be a plate heat exchanger 810.

The heat exchange assembly 800 further comprises a one-way valve 860 and a second electronic expansion valve 850. The check valve 860 is disposed on the fifth pipeline 840, and is configured to prevent the refrigerant of the air conditioner 10 from flowing from the heat exchanger 810 to the third pipeline 700 through the fifth pipeline 840, so as to ensure normal operation of the air conditioner 10. The second electronic expansion valve 850 is disposed on the third pipeline 700 and between ends of the fourth pipeline 830 and the fifth pipeline 840 away from the heat exchanger 810, and is configured to regulate a flow rate of the refrigerant in the third pipeline 700.

Referring to fig. 2, the air conditioner 10 further includes a controller 100, and the controller 100 is electrically connected to the return air pressure sensor 520, the return air temperature sensor 530, the discharge pressure sensor 630, the discharge air temperature sensor 620, the first electronic expansion valve 820, the second electronic expansion valve 850 and the compressor 200, and is configured to receive and control operating conditions of relevant components.

Further, referring to fig. 3, the controller 100 includes a memory 101, a communication interface 102, a processor 103 and a bus 104, the memory 101, the communication interface 102 and the processor 103 are connected via the bus 104, the processor 103 is configured to execute an executable module stored in the memory 101, such as a computer program, code of the computer program may be in a source code form, an object code form, an executable file or some intermediate form, and the like.

The communication interface 102 is used to enable communication with the relevant components (the compressor 200, the return air pressure sensor 520, the return air temperature sensor 530, the discharge air temperature sensor 620, the discharge air pressure sensor 630, the first electronic expansion valve 820, the second electronic expansion valve 850). The bus 104 may be an ISA bus 104, a PCI bus 104, or an EISA bus 104, among others.

The Memory 101 may comprise a high-speed Random Access Memory (RAM) and may also include non-volatile storage (non-V1, e.g., at least one disk Memory). The memory 101 is used to store a program, such as an air conditioning control apparatus 900 shown in fig. 6.

The outdoor unit 200 and the controller 100 of each indoor unit 300 each include at least one software function module that can be stored in the memory 101 in the form of software or firmware (firmware). The processor 103, upon receiving the execution instruction, executes a program to implement the air-conditioning control method shown in fig. 4 or 5, for example.

The working principle and the process of the air conditioner 10 during low-temperature heating operation are as follows:

referring to fig. 1 and 2 again, the high temperature refrigerant flows out from the exhaust port of the compressor 200, sequentially flows through the first second pipeline 600, the first flow channel 812 of the heat exchanger 810, the second pipeline 600, the first interface D and the fourth interface C of the four-way valve 300, and then enters the evaporator of the indoor unit, where the high temperature refrigerant releases heat in the evaporator of the indoor unit to achieve heating, and at the same time, the high temperature refrigerant is converted into a low temperature refrigerant and flows out from the evaporator of the indoor unit, and then enters the condenser 400 to absorb heat after passing through the third pipeline 700 and the second electronic expansion valve 850, and is converted into a high temperature refrigerant again, and the high temperature refrigerant flows out from the condenser 400, sequentially flows through the second interface E and the third interface S of the four-way valve 300 and the first pipeline 500, and then returns to the compressor 200 through the air return port of the compressor 200, and the cycle is repeated, thereby achieving continuous heating.

During the heating operation, the exhaust temperature detected by the exhaust temperature sensor 620 is sent to the controller 100, and if the exhaust temperature is within a proper range, the controller 100 may control the first electronic expansion valve 820 to maintain the current state (closed or small opening), and at this time, the low-temperature refrigerant in the third pipeline 700 may completely enter the condenser 400 and may not enter the fifth pipeline 840. However, if the discharge temperature is too high, the controller 100 may control the first electronic expansion valve 820 to open, so that the low-temperature refrigerant in the third pipeline 700 enters the fifth pipeline 840 in addition to the condenser 400, and then returns to the third pipeline 700 after passing through the second flow channel 814 and the fourth pipeline 830 of the heat exchanger 810 in sequence. When the low-temperature refrigerant flows through the second flow passage 814 of the heat exchanger 810, the heat of the high-temperature refrigerant in the first flow passage 812 of the heat exchanger 810 is absorbed, so that the temperature of the high-temperature refrigerant in the first flow passage 812 is reduced, the exhaust temperature of the air conditioner 10 is reduced, the return air superheat degree of the air conditioner 10 is improved, and the stability and the reliability of the air conditioner 10 during low-temperature heating operation are ensured.

Second embodiment:

the present invention provides an air conditioner control method that can be used to control the operation of the air conditioner 10 of the first embodiment. Referring to fig. 4 and 5, the air conditioner control method includes the following steps:

step S100: and acquiring the outdoor environment temperature Tao, the exhaust temperature Td, the return air pressure Ps and the return air temperature Ts, and calculating the return air superheat degree delta Ts through the return air pressure Ps and the return air temperature Ts.

The exhaust temperature Td is detected by the exhaust temperature sensor 620 and then sent to the controller 100, the return air pressure Ps is detected by the return air pressure sensor 520 and then sent to the controller 100, the return air temperature Ts is detected by the return air temperature sensor 530 and then sent to the controller 100, after the controller 100 receives the return air pressure Ps and the return air temperature Ts, the return air superheat degree Δ Ts is calculated by a formula Δ Ts-Tps, wherein Tps is a saturation temperature corresponding to the return air pressure Ps, and how to obtain the corresponding saturation temperature by the return air pressure Ps is the prior art and is not described herein again.

Of course, it should be noted that, in order to ensure the accuracy of the four parameters of the outdoor ambient temperature Tao, the exhaust temperature Td, the return air pressure Ps, and the return air temperature Ts, the parameters may be obtained and calculated after the air conditioner 10 is started for a certain time (generally 10S to 20S, optionally 15S).

Step S200: when the outdoor ambient temperature Tao is less than the first threshold value T1, the opening Pw1 of the first electronic expansion valve 820 is controlled according to the discharge temperature Td and the return air superheat degree Δ Ts.

Wherein the T1 is less than or equal to-7 ℃. In this example, T1 was-10 ℃. In other embodiments, T1 may also be-7 ℃, -8 ℃, -9 ℃ or-11 ℃.

Further, the step of controlling the opening degree of the first electronic expansion valve 820 according to the exhaust temperature Td and the return air superheat degree Δ Ts includes the following four cases:

in the first case, the exhaust temperature Td is greater than the second threshold T2+1 and the return air superheat degree Δ Ts is less than the third threshold T3-1, then step S210 is executed, in which the target opening P3 of the first electronic expansion valve 820, which needs to be increased, is calculated according to the formula P3 ═ K1 ═ P1+ K2 ═ P2, where K1, P1, K2, and P2 are constants, K1 is greater than or equal to 1 and less than or equal to K2 and less than or equal to 2, P1 is greater than or equal to 5 steps and less than or equal to 15 steps, and P2 is greater than or equal to 10 steps and less than or equal to 20 steps. And a step S220 of controlling the first electronic expansion valve 820 to increase the opening degree according to the magnitude relation between the target opening degree P3 and the maximum opening degree Pmax.

In the second case, when the exhaust temperature Td is greater than the second threshold and the return air superheat degree is greater than or equal to the third threshold, step S212 is executed: calculating a target opening P3 of the first electronic expansion valve 820, which needs to be increased, by using a formula P3-K1-P1, wherein K1 and P1 are constants, K1 is greater than or equal to 1 and less than or equal to 2, and P1 is greater than or equal to 5 steps and less than or equal to 15 steps. And step S220: the first electronic expansion valve 820 is controlled to increase the opening degree according to the magnitude relation between the target opening degree P3 and the maximum opening degree Pmax.

In the third case, when the exhaust temperature Td is less than or equal to the second threshold and the degree of superheat of the returned air is less than the third threshold, step S214 is executed: calculating a target opening P3 of the first electronic expansion valve 820, which needs to be increased, by using a formula P3-K2-P2, wherein K2 and P2 are constants, K2 is greater than or equal to 1 and less than or equal to 2, and P2 is greater than or equal to 10 steps and less than or equal to 20 steps. And executing step S220: the first electronic expansion valve 820 is controlled to increase the opening degree according to the magnitude relation between the target opening degree P3 and the maximum opening degree Pmax.

Wherein T2 is more than or equal to 90 ℃ and less than or equal to 105 ℃. In this embodiment, T2 is 100 ℃, i.e., the second threshold T2+1 is 101 ℃. In other embodiments, T2 may also be 90 degrees celsius, i.e., the second threshold T2+1 is 91 ℃. T2 may also be 105 ℃, i.e. the second threshold T2+1 is 106 ℃.

Further, the step S220 (controlling the first electronic expansion valve 820 to increase the opening degree according to the magnitude relationship between the target opening degree and the maximum opening degree) specifically includes:

controlling the first electronic expansion valve 820 to increase the target opening degree P3 when the target opening degree P3 is less than the maximum opening degree Pmax; when the target opening degree P3 is greater than or equal to the maximum opening degree Pmax, the first electronic expansion valve 820 is controlled to increase the maximum opening degree Pmax. The maximum opening Pmax is set, so that the heating effect of the air conditioner 10 can be prevented from being influenced by the overlarge opening of the first electronic expansion valve 820, and the normal operation of the air conditioner 10 can be ensured.

In an alternative embodiment, after the step S220 (controlling the first electronic expansion valve 820 to increase the opening degree according to the magnitude relation between the target opening degree and the maximum opening degree), the method further comprises the step S230 of controlling the first electronic expansion valve 820 to increase the opening degree for a preset time and then closing the first electronic expansion valve 820. The preset time is 20S-40S. In this embodiment, the preset time is 30S. In other embodiments, the preset time may be 20S, 25S, 35S, or 40S.

In the fourth situation, when the exhaust temperature Td is less than or equal to the second threshold T2+1 and the return air superheat degree Δ Ts is greater than or equal to the third threshold T3-1, the opening Pw1 of the first electronic expansion valve 820 is not adjusted to maintain the current state.

Further, if the discharge air temperature Td satisfies the first condition and the return air superheat degree Δ Ts satisfies the second condition, the steps of obtaining the outdoor ambient temperature Tao, the discharge air temperature Td, the return air pressure Ps, and the return air temperature Ts and calculating the return air superheat degree Δ Ts from the return air pressure Ps and the return air temperature Ts are repeatedly performed, except for not adjusting the opening Pw1 of the first electronic expansion valve 820, until the discharge air temperature Td does not satisfy the first condition and/or the return air superheat degree Δ Ts does not satisfy the second condition, wherein the first condition is less than or equal to a second threshold T2+1 and greater than or equal to a fourth threshold T2-1, and the second condition is less than or equal to a fifth threshold T3+1 and greater than or equal to a third threshold T3-1.

When the exhaust temperature Td satisfies the first condition and the return air superheat degree Δ Ts satisfies the second condition, it indicates that the opening Pw1 of the first electronic expansion valve 820 does not need to be adjusted at present, but tends to be required to be adjusted soon, and therefore, the exhaust temperature Td and the return air superheat degree Δ Ts need to be continuously detected. Subsequently, if the exhaust temperature Td increases and the return air superheat degree Δ Ts decreases, the opening Pw1 of the first electronic expansion valve 820 may need to be adjusted; if the discharge temperature Td decreases and the return air superheat degree Δ Ts increases, the opening Pw1 of the first electronic expansion valve 820 may not need to be adjusted, and the air conditioner 10 may operate in the conventional manner.

When the outdoor ambient temperature Tao is greater than or equal to the first threshold value T1 or when the outdoor ambient temperature Tao is less than the first threshold value T1 but the discharge temperature Td and the return air superheat degree Δ do not belong to any of the four cases, the air conditioner 10 may be normally operated in the conventional manner, that is, the opening Pw1 of the first electronic expansion valve 820 does not need to be adjusted.

When the air conditioner 10 with a low outdoor environment temperature Tao is in low-temperature heating operation, the opening Pw1 of the first electronic expansion valve 820 is controlled according to the exhaust temperature Td and the return air superheat degree Δ Ts, so that the flow of the refrigerant in the second flow channel entering the heat exchanger 810 is adjusted, and the heat exchange cooling effect on the refrigerant in the second pipeline 600 is further adjusted, and thus the flow efficiency of the refrigerant lost after being shunted by the heat exchange assembly 800 is reduced as much as possible while the exhaust temperature Td and the return air superheat degree Δ Ts of the air conditioner 10 are kept in a proper range, and the heating effect of the air conditioner 10 is ensured.

The third embodiment:

referring to fig. 6, the present invention provides an air conditioner control device 900, which can be used in the controller 100 of the air conditioner 10 of the first embodiment, for controlling the air conditioner 10 of the first embodiment to operate by the air conditioner control method of the second embodiment.

The air conditioning control device 900 includes an acquisition module 910 and a control module 920.

The obtaining module 910 is configured to obtain an outdoor environment temperature, an exhaust temperature, a return air pressure, and a return air temperature, and calculate a return air superheat degree according to the return air pressure and the return air temperature. In this embodiment, the obtaining module 910 is configured to execute step S100.

The control module 920 is configured to control the opening of the first electronic expansion valve 820 according to the discharge temperature and the superheat of the return air when the outdoor ambient temperature is less than the first threshold. The control module 920 is used for executing step S200.

When the air conditioner control device 900 is operated for low-temperature heating by the air conditioner 10 with a small outdoor environment temperature, the opening degree of the first electronic expansion valve 820 is controlled according to the exhaust temperature and the return air superheat degree, so that the flow of the refrigerant in the second flow passage entering the heat exchanger 810 is adjusted, the heat exchange and cooling effects of the refrigerant in the second pipeline 600 are adjusted, the exhaust temperature and the return air superheat degree of the air conditioner 10 are kept in a proper range, the flow efficiency of the refrigerant lost after being shunted by the heat exchange assembly 800 is reduced as much as possible, and the heating effect of the air conditioner 10 is ensured.

The fourth embodiment:

an embodiment of the present invention provides a computer-readable storage medium storing a computer-readable program (i.e., the air-conditioning control apparatus 900 in the third embodiment) that, when executed by a processor, implements the air-conditioning control method in the second embodiment.

Note that the computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

In addition, each functional module in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An air conditioner (10), characterized by comprising:

the air return port of the compressor (200) is communicated with one end of the first pipeline (500), and the air exhaust port of the compressor (200) is communicated with one end of the second pipeline (600);

a four-way valve (300), wherein the four-way valve (300) is communicated with one ends of the first pipeline (500) and the second pipeline (600) far away from the compressor (200) at the same time;

a condenser (400), one end of the condenser (400) is communicated with the four-way valve (300), and the other end is communicated with one end of a third pipeline (700);

the heat exchange assembly (800), the heat exchange assembly (800) includes a heat exchanger (810), a fourth pipeline (830), a fifth pipeline (840) and a first electronic expansion valve (820), the heat exchanger (810) includes a first flow channel (812) and a second flow channel (814) which can exchange heat, the first flow channel (812) is communicated with the second pipeline (600), two ends of the second flow channel (814) are respectively communicated with one ends of the fourth pipeline (830) and the fifth pipeline (840), the other ends of the fourth pipeline (830) and the fifth pipeline (840) are respectively communicated with the third pipeline (700), and the first electronic expansion valve (820) is arranged on the fourth pipeline (830).

2. The air conditioner (10) of claim 1, wherein the heat exchange assembly (800) further comprises a second electronic expansion valve (850), the second electronic expansion valve (850) being disposed in the third conduit (700) between the ends of the fourth and fifth conduits (830, 840) distal from the heat exchanger (810).

3. The air conditioner (10) of claim 1, wherein the heat exchange assembly (800) further comprises a check valve (860), and the check valve (860) is disposed in the fifth pipeline (840) for preventing the refrigerant from flowing from the heat exchanger (810) to the third pipeline (700) through the fifth pipeline (840).

4. The air conditioner (10) of claim 1, wherein the heat exchanger (810) is a double pipe heat exchanger (810) or a plate heat exchanger (810).

5. An air conditioner control method for controlling an operation of an air conditioner (10) according to any one of claims 1 to 4, characterized by comprising:

controlling the opening degree of the first electronic expansion valve (820) according to the exhaust temperature and the return air superheat degree when the outdoor environment temperature is less than a first threshold value.

6. The air conditioner control method as claimed in claim 5, wherein the first threshold value is T1, and the T1 ≦ -7 ℃.

7. The air conditioning control method according to claim 5, wherein the step of calculating the return air superheat degree from the return air pressure and the return air temperature includes:

and calculating the return air superheat degree by a formula of delta Ts-Tps, wherein the delta Ts is the return air superheat degree, the Ts is the return air temperature, and the Tps is the saturation temperature corresponding to the return air pressure.

8. The air conditioning control method according to claim 5, wherein the step of controlling the opening degree of the first electronic expansion valve (820) according to the discharge air temperature and the return air superheat degree comprises:

under the condition that the exhaust gas temperature is greater than a second threshold value and the return air superheat degree is less than a third threshold value, calculating a target opening degree of the first electronic expansion valve (820) needing to be increased by a formula P3-K1-P1 + K2-P2, wherein P3 is the target opening degree, K1, P1, K2 and P2 are constants, K1 is greater than or equal to 1 and less than or equal to K2 and less than or equal to 2, P1 is greater than or equal to 5 steps and less than or equal to 15 steps, and P2 is greater than or equal to 10 steps and less than or equal to 20 steps;

and controlling the first electronic expansion valve (820) to increase the opening degree according to the magnitude relation between the target opening degree and the maximum opening degree.

9. The air conditioning control method according to claim 5, wherein the step of controlling the opening degree of the first electronic expansion valve (820) according to the discharge air temperature and the return air superheat degree comprises:

under the condition that the exhaust gas temperature is greater than a second threshold value and the return air superheat degree is greater than or equal to a third threshold value, calculating a target opening degree of the first electronic expansion valve (820) needing to be increased by using a formula P3-K1-P1, wherein P3 is the target opening degree, K1 and P1 are both constants, K1 is greater than or equal to 1 and less than or equal to 2, and 5 steps are less than or equal to P1 and less than or equal to 15 steps;

10. The air conditioning control method according to claim 5, wherein the step of controlling the opening degree of the first electronic expansion valve (820) according to the discharge air temperature and the return air superheat degree comprises:

under the condition that the exhaust gas temperature is less than or equal to a second threshold value and the return air superheat degree is less than a third threshold value, calculating a target opening degree of the first electronic expansion valve (820) needing to be increased by using a formula P3-K2-P2, wherein P3 is the target opening degree, K2 and P2 are both constants, K2 is not less than 1 and not more than 2, and P2 is not less than 10 steps and not more than 20 steps;

11. The air conditioner controlling method according to any one of claims 8 to 10, wherein the second threshold value is T2+1, and 90 ℃ ≦ T2 ≦ 105 ℃.

12. The air conditioning control method according to any one of claims 8-10, wherein the step of controlling the first electronic expansion valve (820) to increase the opening degree according to the magnitude relationship between the target opening degree and the maximum opening degree comprises:

controlling the first electronic expansion valve (820) to increase the target opening degree if the target opening degree is less than the maximum opening degree;

controlling the first electronic expansion valve (820) to increase a maximum opening degree when the target opening degree is greater than or equal to the maximum opening degree.

13. The air conditioner controlling method according to any one of claims 8-10, wherein the step of controlling the first electronic expansion valve (820) to increase the opening degree is followed by further comprising:

and controlling the first electronic expansion valve (820) to close after increasing the opening degree for a preset time.

14. The air conditioning control method according to claim 5, wherein the steps of obtaining the outdoor ambient temperature, the discharge temperature, the return air pressure, and the return air temperature, and calculating the return air superheat degree from the return air pressure and the return air temperature are repeatedly performed in a case where the discharge air temperature satisfies a first condition that is less than or equal to a second threshold value and that is greater than or equal to a fourth threshold value, and the return air superheat degree satisfies a second condition that is less than or equal to a fifth threshold value and that is greater than or equal to a third threshold value, until the discharge air temperature does not satisfy the first condition and/or the return air superheat degree does not satisfy the second condition.

15. An air conditioner control device (900) for controlling the operation of an air conditioner (10) as claimed in any one of claims 1 to 4, comprising:

the device comprises an acquisition module (910) for acquiring outdoor environment temperature, exhaust temperature, return air pressure and return air temperature, and calculating the degree of superheat of return air according to the return air pressure and the return air temperature;

and the control module (920) is used for controlling the opening degree of the first electronic expansion valve (820) according to the exhaust temperature and the return air superheat degree under the condition that the outdoor environment temperature is less than a first threshold value.