CN116734428A - Start control method of air conditioner - Google Patents

Abstract

The application relates to the technical field of air conditioners, in particular to a starting control method of an air conditioner. The application aims to solve the problem that the starting speed is slow due to the fact that waiting time is set for preventing the overload when the existing press is started. For this purpose, the outdoor heat exchanger of the air conditioner of the present application comprises a plurality of heat exchange tube sections and an on-off valve group, the on-off valve group can control the communication form between the heat exchange tube sections, and the starting control method comprises: after a compressor starting signal is obtained, controlling the starting of a compressor, and obtaining the high-pressure and low-pressure of an air conditioner; calculating a first ratio of the high pressure to the low pressure; determining an opening and closing mode of the on-off valve group based on a section where the first ratio is located; and controlling the action of the on-off valve group based on the on-off mode. The application can detect the starting load in real time, and realize the self-adaptive variable flow control of the system pressure ratio based on the detection result, thereby ensuring the quick and effective starting of the compressor.

Description

Start control method of air conditioner

Technical Field

The application relates to the technical field of air conditioners, in particular to a starting control method of an air conditioner.

Background

The compressor is a core functional component in the air conditioner, and the operation stability of the compressor directly determines the operation stability of the air conditioner. In general, when the air conditioner is started for the first time, the mode is switched, and the compressor such as Wen Tingji needs to be restarted, if the air conditioner is started immediately, the power module is in overload protection or the compressor is burnt out due to starting failure caused by excessive load.

In order to prevent the situation that the air conditioner cannot be started or fails to be started due to overlarge load, in the prior art, a period of time is needed to wait after a starting signal is received, and the external fan is controlled to be started and a throttle valve to act first, so that the air conditioner system reaches a certain balance ratio and then the compressor is started.

However, this control method obviously causes the starting speed of the air conditioner to be slow, which is unfavorable for improving the use experience of the user.

Accordingly, there is a need in the art for a new solution to the above-mentioned problems.

Disclosure of Invention

In order to solve at least one of the above problems in the prior art, that is, in order to solve the problem that the starting speed is reduced by setting a waiting time for preventing an excessive load when the existing press is started, the present application provides a starting control method of an air conditioner, the air conditioner comprising a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger connected through a refrigerant pipe, the outdoor heat exchanger comprising a plurality of heat exchange pipe sections, an on-off valve group further provided in the outdoor heat exchanger, the on-off valve group comprising a plurality of on-off valves, the on-off valve group being provided to be capable of controlling a communication form between the plurality of heat exchange pipe sections,

the starting control method comprises the following steps:

after a compressor starting signal is obtained, controlling the compressor to start, and obtaining the high-pressure and low-pressure of the air conditioner;

calculating a first ratio of the high pressure to the low pressure;

determining an opening and closing mode of the on-off valve group based on the interval where the first ratio is located;

and controlling the action of the on-off valve group based on the opening and closing mode.

In the preferred technical scheme of the startup control method of the air conditioner, the outdoor heat exchanger comprises a first heat exchange tube section, a second heat exchange tube section and a third heat exchange tube section which are sequentially connected, the outdoor heat exchanger further comprises a first branch tube, a second branch tube and a third branch tube, a first end of the first branch tube is communicated with a refrigerant pipeline between the compressor and the first heat exchange tube section, a second end of the first branch tube is communicated with a refrigerant pipeline between the second heat exchange tube section and the third heat exchange tube section, one end of the second branch tube is communicated with the third branch tube, a second end of the second branch tube is communicated with one end of the third heat exchange tube section, which is close to the second heat exchange tube section, a first end of the third branch tube is communicated with a refrigerant pipeline between the first heat exchange tube section and the second heat exchange tube section, a second end of the third branch tube is communicated with a refrigerant pipeline between the third heat exchange tube section and the throttling device,

the on-off valve group comprises a first on-off valve, a second on-off valve, a third on-off valve and a fourth on-off valve, wherein the first on-off valve is arranged on the first branch pipe, the second on-off valve is arranged on a refrigerant pipeline between the second heat exchange pipe section and the third heat exchange pipe section and is positioned between the second end of the first branch pipe and the third heat exchange pipe section, the third on-off valve is arranged on the second branch pipe, and the fourth on-off valve is arranged on the third branch pipe and is positioned between the first end of the second branch pipe and the second end of the third branch pipe.

In the above preferred technical solution of the method for controlling the start of an air conditioner, the step of determining the on/off mode of the on/off valve group based on the section where the first ratio is located further includes:

if the first ratio is smaller than or equal to a first preset threshold, determining that the opening and closing mode of the on-off valve group is a first mode;

wherein the first mode is: the first on-off valve, the third on-off valve and the fourth on-off valve are closed, and the second on-off valve is opened.

In the above preferred technical solution of the method for controlling the start of an air conditioner, the step of determining the on/off mode of the on/off valve group based on the section where the first ratio is located further includes:

if the first ratio is larger than the first preset threshold value and smaller than or equal to a second preset threshold value, determining that the opening and closing mode of the on-off valve group is a second mode;

wherein the second mode is: the first on-off valve and the third on-off valve are opened, and the second on-off valve and the fourth on-off valve are closed.

In the above preferred technical solution of the method for controlling the start of an air conditioner, the step of determining the on/off mode of the on/off valve group based on the section where the first ratio is located further includes:

if the first ratio is larger than the second preset threshold and smaller than or equal to a third preset threshold, determining that the opening and closing mode of the on-off valve group is a third mode;

wherein the third mode is: the first on-off valve, the second on-off valve and the third on-off valve are opened, and the fourth on-off valve is closed.

In the above preferred technical solution of the method for controlling the start of an air conditioner, the step of determining the on/off mode of the on/off valve group based on the section where the first ratio is located further includes:

if the first ratio is larger than the third preset threshold, determining that the opening and closing mode of the on-off valve group is a fourth mode;

wherein the fourth mode is: the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve are all opened.

In the preferred technical solution of the above-mentioned method for controlling the start of an air conditioner, after the step of controlling the on-off valve set to operate in the fourth mode, the method for controlling the start further includes:

continuously acquiring the high pressure and the low pressure of the air conditioner;

calculating a third ratio of the high pressure to the low pressure;

comparing the third ratio with the third preset threshold value;

and selectively controlling the compressor to stop according to the comparison result.

In a preferred embodiment of the above method for controlling the start of an air conditioner, the step of selectively controlling the start of the compressor according to the comparison result further includes:

and if the third ratio is larger than the third preset threshold, controlling the compressor to stop, and controlling the indoor fan and the outdoor fan to start until the third ratio is smaller than or equal to the third preset threshold, and controlling the compressor to restart.

In a preferred technical solution of the above method for controlling startup of an air conditioner, the startup control method further includes:

after the compressor is controlled to start, acquiring a plurality of high-pressure pressures and a plurality of low-pressure pressures of the air conditioner;

calculating a pressure ratio change rate of the air conditioner based on the plurality of high pressure pressures and the plurality of low pressure pressures;

comparing the pressure ratio change rate with a preset pressure ratio threshold value;

and when the pressure ratio change rate is smaller than the preset pressure ratio threshold value, controlling the on-off valve group to be switched to an opening and closing state before the compressor is started.

In the above preferred technical solution of the method for controlling the start of an air conditioner, the step of "obtaining the high pressure and the low pressure of the air conditioner" further includes:

and obtaining the maximum value of the high pressure and the maximum value of the low pressure in a preset time.

According to the starting control method, the high-pressure and the low-pressure of the air conditioner are obtained while the compressor is started, then the opening and closing modes of the on-off valve group are adjusted based on the first ratio of the high-pressure and the low-pressure, the starting load can be detected in real time, the self-adaptive variable flow control of the system pressure ratio is realized based on the detection result, and the quick and effective starting of the compressor is ensured.

Drawings

The present application is described below with reference to the accompanying drawings. In the accompanying drawings:

FIG. 1 is a system diagram of an air conditioner according to the present application;

FIG. 2 is a flowchart of a start control method of an air conditioner according to the present application;

fig. 3 is a logic diagram of a possible embodiment of a start control method of an air conditioner according to the present application.

List of reference numerals

1. A compressor; 2. a four-way valve; 3. an outdoor heat exchanger; 31. a first heat exchange tube section; 32. a second heat exchange tube section; 33. a third heat exchange tube section; 4. a throttle device; 5. an indoor heat exchanger; 6. a refrigerant pipe; 71. a first branch pipe; 72. a second branch pipe; 73. a third branch pipe; 81. a first on-off valve; 82. a second on-off valve; 83. a third cut-off valve; 84. and a fourth shut-off valve.

Detailed Description

Preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present application, and are not intended to limit the scope of the present application. For example, although the steps are described in the following embodiments in terms of the above-described order, it will be understood by those skilled in the art that, in order to achieve the effects of the present embodiments, the steps need not be performed in such order, and may be performed simultaneously (in parallel) or in reverse order, and these simple variations are within the scope of the present application.

It should be noted that, in the description of the present application, terms such as "upper", "lower", and the like, refer to directions or positional relationships based on those shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present application, "a plurality" means at least two.

Furthermore, it should be noted that, in the description of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those skilled in the art according to the specific circumstances.

Referring first to fig. 1, an air conditioner of the present application will be described. As shown in fig. 1, in order to solve the problem that the starting speed is slow due to the fact that waiting time is set for preventing excessive load when the existing press is started, the air conditioner of the application comprises a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a throttling device 4 and an indoor heat exchanger 5. Wherein, the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the first throttling device 4 and the indoor heat exchanger 5 are sequentially communicated through a refrigerant pipeline 6 to form refrigerant circulation. Preferably, the indoor heat exchanger 5 has an inner line and an outer line, both of which are arranged in parallel. The first throttle device 4 is an electronic expansion valve. The connection mode and the working principle of the air conditioner are conventional technical means in the field, and the application is not repeated.

In particular, the outdoor heat exchanger 3 of the present application includes a plurality of heat exchange tube sections, and an on-off valve group including a plurality of on-off valves is further provided in the outdoor heat exchanger 3, the on-off valve group being provided so as to be capable of controlling a communication form between the plurality of heat exchange tube sections.

Preferably, the outdoor heat exchanger 3 includes a first heat exchange tube segment 31, a second heat exchange tube segment 32, and a third heat exchange tube segment 33 connected in sequence. The first heat exchange tube section 31 is located in the middle of the outdoor heat exchanger 3, the second heat exchange tube section 32 is located above the first heat exchange tube section 31, and the third heat exchange tube section 33 is located below the first heat exchange tube section 31. One end of the first heat exchange tube section 31 is communicated with an exhaust port of the compressor 1 through a refrigerant pipeline 6, the other end of the first heat exchange tube section 31 is communicated with one end of the second heat exchange tube section 32 through the refrigerant pipeline 6, the other end of the second heat exchange tube section 32 is communicated with one end of the third heat exchange tube section 33 through the refrigerant pipeline 6, and the other end of the third heat exchange tube section 33 is communicated with the throttling device 4 through the refrigerant pipeline 6.

The outdoor heat exchanger 3 further includes a first branch pipe 71, a second branch pipe 72, and a third branch pipe 73. Wherein, the first end of the first branch pipe 71 is connected to the refrigerant pipeline 6 between the compressor 1 and the first heat exchange pipe section 31, and the second end of the first branch pipe 71 is connected to the refrigerant pipeline 6 between the second heat exchange pipe section 32 and the third heat exchange pipe section 33. The first end of the second branch pipe 72 is connected to the third branch pipe 73, the second end of the second branch pipe 72 is connected to an end of the third heat exchange pipe section 33 near the second heat exchange pipe section 32 (i.e., an end of the third heat exchange pipe section 33 connected to the second heat exchange pipe section 32), the first end of the third branch pipe 73 is connected to the refrigerant pipe 6 between the first heat exchange pipe section 31 and the second heat exchange pipe section 32, and the second end of the third branch pipe 73 is connected to the refrigerant pipe 6 between the third heat exchange pipe section 33 and the throttling device 4.

The on-off valve group includes a first on-off valve 81, a second on-off valve 82, a third on-off valve 83, and a fourth on-off valve 84. The first on-off valve 81 is disposed on the first branch pipe 71, the second on-off valve 82 is disposed on the refrigerant pipeline 6 between the second heat exchange pipe section 32 and the third heat exchange pipe section 33 and between the second end of the first branch pipe 71 and the third heat exchange pipe section 33, the third on-off valve 83 is disposed on the second branch pipe 72, and the fourth on-off valve 84 is disposed on the third branch pipe 73 and between the first end of the second branch pipe 72 and the second end of the third branch pipe 73.

In the above arrangement, by controlling the opening and closing of the first on-off valve 81, the second on-off valve 82, the third on-off valve 83, and the fourth on-off valve 84, different communication forms of the first heat exchange tube section 31, the second heat exchange tube section 32, and the third heat exchange tube section 33 can be realized, thereby realizing different heat exchange effects of the outdoor heat exchanger 3.

It will be appreciated by those skilled in the art that the above-described air conditioner is merely preferred, and that those skilled in the art may modify the structure of the above-described air conditioner without departing from the principles of the present application, so that the present application is applicable to more specific application scenarios. For example, although the above air conditioner is described in connection with the four-way valve 2, this embodiment is not necessarily the same, and in other embodiments, one skilled in the art may alternatively omit the four-way valve 2 to change the air conditioner into a single-warm air conditioner. As another example, the specific form of the first throttling device 4 is not limited to the present application, and the first throttling device 4 may be a capillary tube or a thermal expansion valve. For another example, although the outdoor heat exchanger 3 is described above as including a main heat exchange tube section and an auxiliary heat exchange tube section, the specific structural form of the outdoor heat exchanger 3 is not necessarily the same, and those skilled in the art may replace it, such as including only the main heat exchange tube section and omitting the auxiliary heat exchange tube section. For another example, the number and the arrangement mode of the heat exchange tube sections, the number of the branch tubes, the connection mode, the number and the arrangement position of the on-off valves in the on-off valve group and other persons skilled in the art can be adaptively adjusted, so that the application is suitable for more specific application scenes. For example, one skilled in the art may increase or decrease the number of heat exchange tube sections, the location of placement, the manner of communication, etc.; alternatively, the number of branch pipes and the communication relation can be increased or decreased; still alternatively, the number and placement of on-off valves may be increased or decreased. In summary, this modification does not deviate from the principle of the application as long as the adjustment of the form of communication of the heat exchange tube sections can be achieved by controlling the opening and closing of the on-off valves in the on-off valve group.

Next, a start control method of an air conditioner according to the present application will be described with reference to fig. 2.

As shown in fig. 2, the method for controlling the start of the air conditioner according to the present application includes:

s101, after a compressor starting signal is obtained, controlling the starting of a compressor, and obtaining the high-pressure and low-pressure of the air conditioner. For example, after receiving a compressor start signal, the compressor is controlled to start, and simultaneously, the high pressure and the low pressure of the air conditioner are immediately acquired. The high-pressure can be obtained through a pressure sensor arranged at the exhaust port of the compressor, and the low-pressure can be obtained through a pressure sensor arranged at the air suction port of the compressor.

S103, calculating a first ratio of the high pressure to the low pressure. For example, after the high pressure and the low pressure are obtained, a first ratio of the high pressure to the low pressure is calculated by dividing the high pressure by the low pressure.

S105, determining the opening and closing modes of the on-off valve group based on the section where the first ratio is located. For example, after the first ratio is calculated, the high-low pressure ratio of the air conditioning system can be obtained, the pressure ratio of the current system can be judged according to the high-low pressure ratio, so that the opening and closing mode of the on-off valve group suitable for the current situation can be determined according to the pressure ratio, and the pressure ratio of the system can be adjusted by adjusting the opening and closing mode of the on-off valve group.

S107, controlling the on-off valve group to act based on the opening and closing mode. For example, after determining the on-off mode of the on-off valve group, each on-off valve in the on-off valve group is controlled to be on-off controlled according to the on-off mode.

According to the starting control method, the high-pressure and the low-pressure of the air conditioner are obtained while the compressor is started, then the opening and closing modes of the on-off valve group are adjusted based on the first ratio of the high-pressure and the low-pressure, the starting load can be detected in real time, the self-adaptive variable flow control of the system pressure ratio is realized based on the detection result, and the quick and effective starting of the compressor is ensured.

The following describes preferred embodiments of the present application.

In one embodiment, the on-off valve group of the present application includes a first mode, a second mode, a third mode and a fourth mode. Wherein:

in the first mode, the first on-off valve, the third on-off valve and the fourth on-off valve are closed, and the second on-off valve is opened. In this way, in the operation process, after being discharged from the compressor and passing through the four-way valve, the refrigerant enters the first heat exchange tube section from the upper part of the first heat exchange tube section, is discharged from the lower part of the first heat exchange tube section, enters the second heat exchange tube section from the lower part of the second heat exchange tube section, is discharged from the upper part of the second heat exchange tube section, enters the third heat exchange tube section from the upper part of the third heat exchange tube section, and is finally discharged to the throttling device from the lower part of the third heat exchange tube section. That is, the refrigerant sequentially passes through the first heat exchange tube section, the second heat exchange tube section and the third heat exchange tube section.

In the second mode, the first on-off valve and the third on-off valve are opened, and the second on-off valve and the fourth on-off valve are closed. In this way, in the operation process, the refrigerant is discharged from the compressor and is divided into two parts after passing through the four-way valve, one part of the refrigerant enters the first heat exchange tube section through the upper part of the first heat exchange tube section and is discharged from the lower part of the first heat exchange tube section, and the other part of the refrigerant enters the second heat exchange tube section through the upper part of the second heat exchange tube section and is discharged from the lower part of the second heat exchange tube section. After the refrigerants discharged from the first heat exchange tube section and the second heat exchange tube section are converged, the refrigerants enter the third heat exchange tube section from the upper part of the third heat exchange tube section together, and finally are discharged to the throttling device from the lower part of the third heat exchange tube section.

In the third mode, the first on-off valve, the second on-off valve and the third on-off valve are opened, and the fourth on-off valve is closed. In this way, in the operation process, the refrigerant is discharged from the compressor and is divided into two parts after passing through the four-way valve, the first part of refrigerant enters the first heat exchange tube section through the upper part of the first heat exchange tube section and is discharged from the lower part of the first heat exchange tube section, and the second part of refrigerant is divided into two parts, wherein a small part of refrigerant enters the second heat exchange tube section through the upper part of the second heat exchange tube section and is discharged from the lower part of the second heat exchange tube section, and most of refrigerant directly reaches the third heat exchange tube section. After the refrigerant discharged by the first heat exchange tube section and the second heat exchange tube section is converged with the refrigerant reaching the third heat exchange tube section, the refrigerant enters the third heat exchange tube section from the upper part of the third heat exchange tube section together, and finally is discharged to the throttling device from the lower part of the third heat exchange tube section.

In the fourth mode, the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve are all opened. In this way, in the operation process, the refrigerant is discharged by the compressor and passes through the four-way valve, then is divided into two parts after being discharged by the compressor and passes through the four-way valve, the first part of refrigerant enters the first heat exchange tube section through the upper part of the first heat exchange tube section and directly reaches the third branch pipe after being discharged by the lower part of the first heat exchange tube section, the second part of refrigerant is divided into two parts, wherein a small part of refrigerant enters the second heat exchange tube section through the upper part of the second heat exchange tube section and directly reaches the third branch pipe after being discharged by the lower part of the second heat exchange tube section, and the majority of refrigerant directly reaches the third branch pipe. And after the refrigerants discharged by the first heat exchange tube section and the second heat exchange tube section are combined with the refrigerants directly reaching the third branch tube, the refrigerants flow to the throttling device from the third branch tube together.

Of course, the opening and closing modes in the present application include four types, which are only preferable, and can be adjusted by those skilled in the art based on specific application scenarios. Such as adding or deleting an open-close mode, etc.

In one embodiment, the step of determining the on-off mode of the on-off valve group based on the section where the first ratio is located further includes: if the first ratio is smaller than or equal to a first preset threshold value, determining that the opening and closing mode of the on-off valve group is a first mode; if the first ratio is larger than a first preset threshold value and smaller than or equal to a second preset threshold value, determining that the opening and closing mode of the on-off valve group is a second mode; if the first ratio is larger than the second preset threshold value and smaller than or equal to the third preset threshold value, determining that the opening and closing mode of the on-off valve group is a third mode; if the first ratio is larger than a third preset threshold value, determining that the opening and closing mode of the on-off valve group is a fourth mode.

Specifically, in the present application, the first preset threshold value is 1, the second preset threshold value is 1.5, and the third preset threshold value is 2 are taken as examples. After a first ratio of the high pressure to the low pressure is calculated, the section where the first ratio is located is judged. If the first ratio is K1, if K1 is less than or equal to 1, the high-low pressure ratio of the air conditioner is smaller, the system load is smaller, the high-low pressure ratio of the system is only required to be properly regulated, and the on-off valve group is controlled to operate in a first mode. If K1 is more than 1 and less than or equal to 1.5, the high-low pressure ratio of the air conditioner is proved to be increased, the system load is increased, the on-off valve group is controlled to operate in a second mode, the heat exchange effect of the outdoor heat exchanger is reduced, the low-pressure is improved, and the system load is properly reduced. If K1 is more than 1.5 and less than or equal to 2, the air conditioner has larger high and low pressure, the system load is further increased, and the on-off valve group is controlled to operate in a third mode, so that the heat exchange effect of the outdoor heat exchanger is further reduced, the low pressure is improved, and the system load is reduced. If K1 is more than 2, the air conditioner is higher in high-low pressure, the system load is in a high position, the risk of the compressor is larger, the on-off valve group is controlled to operate in a fourth mode, heat exchange of the outdoor heat exchanger is reduced to the greatest extent, the low-pressure is improved rapidly, and the system load is reduced.

By controlling the on-off mode of the on-off valve group based on the first ratio, the application can realize the self-adaptive adjustment of the high-low pressure ratio of the system, has high adjustment precision, and is beneficial to the quick start of compressors under different starting conditions.

Of course, the specific values of the first preset threshold, the second preset threshold and the third preset threshold are merely exemplary, and those skilled in the art can adjust the values based on specific application scenarios without departing from the principles of the present application.

In one embodiment, after the step of "controlling the on-off valve group to operate in the fourth mode", the start control method further includes: continuously acquiring high pressure and low pressure of an air conditioner; calculating a third ratio of the high pressure to the low pressure; comparing the third ratio with a third preset threshold value; and selectively controlling the compressor to stop according to the comparison result. Specifically, the step of "selectively controlling the start of the compressor according to the comparison result" further includes: and if the third ratio is larger than a third preset threshold, controlling the compressor to stop, and controlling the indoor fan and the outdoor fan to start until the third ratio is smaller than or equal to the third preset threshold, and controlling the compressor to restart.

For example, when the on-off valve set operates in the fourth mode, the air conditioner is proved to be in a high pressure ratio state, and the system risk is high, so that the safety of the air conditioner at the moment is required to be monitored besides the rapid reduction of the system pressure ratio. Therefore, after the on-off valve group is controlled to run in the fourth mode, the high-pressure and the low-pressure of the air conditioner are continuously obtained, the third ratio of the high-pressure to the low-pressure is calculated, and the third ratio is continuously compared with the third preset threshold. Taking the third ratio as K3 and taking the third preset threshold value as 2 as an example, if K3 is more than 2, the air conditioner is proved to be in a high-pressure ratio state continuously, and the risk of the air conditioner is larger, so that the compressor is controlled to stop first, and the fault of the compressor is avoided. And at the moment, the indoor fan and the outdoor fan are firstly started to operate so as to balance the high-low pressure ratio of the system. And continuously detecting the high-low pressure ratio of the system until K3 is less than or equal to 2, and controlling the compressor to restart. Otherwise, if the third ratio is smaller than or equal to the third preset threshold, the system high-low pressure ratio is reduced in the fourth mode, the risk of the fault of the compressor is reduced, and the running state of the compressor is kept.

Through the control mode, when the high-low pressure ratio of the system is high, the safety monitoring of the compressor can be realized by continuously monitoring the high-low pressure ratio, the safety of the system is improved, and the fault of the compressor is prevented.

Of course, the above control is merely preferred and can be adjusted by a person skilled in the art. For example, the step of determining the third pressure ratio may be omitted as a whole; alternatively, one skilled in the art may adjust the specific control mode of the compressor after shutdown, such as controlling only the operation of the indoor fan or the outdoor fan.

In one embodiment, the start control method further includes: after the compressor is controlled to start, a plurality of high-pressure pressures and a plurality of low-pressure pressures of the air conditioner are obtained; calculating a pressure ratio change rate of the air conditioner based on the plurality of high pressure pressures and the plurality of low pressure pressures; comparing the pressure ratio change rate with a preset pressure ratio threshold value; when the pressure ratio change rate is smaller than a preset pressure ratio threshold value, the on-off valve group is controlled to be switched to an open-close state before the compressor is started.

Specifically, no matter what mode the on-off valve group is operated in, after the compressor is started and operated stably, the air conditioner needs to be controlled to recover to a normal operation mode so as to improve the operation efficiency. In the application, whether the compressor operates stably is judged by sequentially acquiring the high-pressure and low-pressure of a plurality of air conditioners, such as acquiring the high-pressure and low-pressure of the air conditioners every 5s or 15s, and then calculating the change rate of the high-low pressure ratio, namely the ratio of the latter high-low pressure ratio to the former high-low pressure ratio. The preset pressure ratio threshold value can be 0.1, in other words, when the pressure ratio change rate is smaller than 0.1, the operation of the compressor tends to be stable at the moment is proved, and the on-off valve group can be controlled to be switched back to the state before the compressor is started, so that the conventional operation of the air conditioner is realized. For example, if the on-off valve set is in the first mode before the compressor is started, the on-off valve set is controlled to switch back to the first mode when the rate of change of the pressure ratio is less than 0.1. If the on-off valve group is in other states, the on-off valve group is correspondingly controlled to be switched back to the state.

Of course, the above control is merely preferred and can be adjusted by a person skilled in the art. For example, the on-off valve group can be switched to be in an on-off state corresponding to the current air conditioner operation mode. Further, the specific values of the interval duration and the preset pressure ratio threshold are merely exemplary and can be adjusted by those skilled in the art.

In one embodiment, the step of "obtaining the high pressure and the low pressure of the air conditioner" further includes: and obtaining the maximum value of the high pressure and the maximum value of the low pressure in a preset time period.

For example, the preset duration may be any value from 2 to 10s, taking 5s as an example, when the high pressure and the low pressure of the air conditioner are obtained, the detection is continuously performed for 5s, and the maximum value of the high pressure and the maximum value of the low pressure in the 5s are obtained to calculate the high-low pressure ratio of the air conditioner, so as to guarantee the stability of the calculated result.

Of course, the above steps are not essential and can be optionally omitted by those skilled in the art. In addition, the preset duration may be adjusted by those skilled in the art based on the specific scenario.

One possible implementation of the application is described below in connection with fig. 3.

As shown in fig. 3, during one possible operation:

s201, after receiving the compressor start signal, the compressor starts to run, and simultaneously the high pressure Pcon and the low pressure Peva of the air conditioner are acquired, and then S202 is executed.

S202, k1=pcon/Peva is calculated.

S203, if K1 is less than or equal to 1, the on-off valve group is controlled to be switched to a first mode.

S204, if K1 is more than 1 and less than or equal to 1.5, the on-off valve group is controlled to be switched to a second mode.

S205, if K1 is more than 1.5 and less than or equal to 2, the on-off valve group is controlled to be switched to a third mode.

S206, if K1 > 2, the on-off valve group is controlled to be switched to a fourth mode, and then S207 is executed.

S207, the high pressure Pcon and the low pressure Peva of the air conditioner are acquired again, and k3=pcon/Peva is calculated, and then S208 is performed.

S208, judging whether K3 > 2 is true? If so, then S209 is performed; otherwise, if not, S210 is performed.

S209, controlling the compressor to stop, controlling the indoor fan and the outdoor fan to start and run, and returning to continue to execute S207.

S210, controlling the operation of the compressor.

It should be noted that, although the detailed steps of the method of the present application are described above in detail, those skilled in the art may combine, split and exchange the sequence of the steps without departing from the basic principle of the present application, and the technical solution modified in this way does not change the basic concept of the present application, and therefore falls within the scope of protection of the present application.

Those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims of the present application, any of the claimed embodiments may be used in any combination.

Thus far, the technical solution of the present application has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present application is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present application, and such modifications and substitutions will fall within the scope of the present application.

Claims (10)

1. A start control method of an air conditioner is characterized in that the air conditioner comprises a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger which are connected through a refrigerant pipeline, the outdoor heat exchanger comprises a plurality of heat exchange pipe sections, an on-off valve group is further arranged in the outdoor heat exchanger, the on-off valve group comprises a plurality of on-off valves, the on-off valve group is arranged to control the communication form among the plurality of heat exchange pipe sections,

the starting control method comprises the following steps:

after a compressor starting signal is obtained, controlling the compressor to start, and obtaining the high-pressure and low-pressure of the air conditioner;

calculating a first ratio of the high pressure to the low pressure;

determining an opening and closing mode of the on-off valve group based on the interval where the first ratio is located;

and controlling the action of the on-off valve group based on the opening and closing mode.

2. The method according to claim 1, wherein the outdoor heat exchanger includes a first heat exchange pipe section, a second heat exchange pipe section, and a third heat exchange pipe section connected in this order, the outdoor heat exchanger further includes a first branch pipe, a second branch pipe, and a third branch pipe, a first end of the first branch pipe is connected to a refrigerant line between the compressor and the first heat exchange pipe section, a second end of the first branch pipe is connected to a refrigerant line between the second heat exchange pipe section and the third heat exchange pipe section, a first end of the second branch pipe is connected to the third branch pipe, a second end of the second branch pipe is connected to an end of the third heat exchange pipe section near the second heat exchange pipe section, a first end of the third branch pipe is connected to a refrigerant line between the first heat exchange pipe section and the second heat exchange pipe section, a second end of the third branch pipe is connected to a refrigerant line between the third heat exchange pipe section and the throttle device,

the on-off valve group comprises a first on-off valve, a second on-off valve, a third on-off valve and a fourth on-off valve, wherein the first on-off valve is arranged on the first branch pipe, the second on-off valve is arranged on a refrigerant pipeline between the second heat exchange pipe section and the third heat exchange pipe section and is positioned between the second end of the first branch pipe and the third heat exchange pipe section, the third on-off valve is arranged on the second branch pipe, and the fourth on-off valve is arranged on the third branch pipe and is positioned between the first end of the second branch pipe and the second end of the third branch pipe.

3. The method of controlling the start of an air conditioner according to claim 2, wherein the step of determining the on-off mode of the on-off valve group based on the interval in which the first ratio is located further comprises:

if the first ratio is smaller than or equal to a first preset threshold, determining that the opening and closing mode of the on-off valve group is a first mode;

wherein the first mode is: the first on-off valve, the third on-off valve and the fourth on-off valve are closed, and the second on-off valve is opened.

4. The method of controlling start-up of an air conditioner according to claim 3, wherein the step of determining the on-off mode of the on-off valve group based on the interval in which the first ratio is located further comprises:

if the first ratio is larger than the first preset threshold value and smaller than or equal to a second preset threshold value, determining that the opening and closing mode of the on-off valve group is a second mode;

wherein the second mode is: the first on-off valve and the third on-off valve are opened, and the second on-off valve and the fourth on-off valve are closed.

5. The method of controlling start-up of an air conditioner according to claim 4, wherein the step of determining the on-off mode of the on-off valve group based on the interval in which the first ratio is located further comprises:

if the first ratio is larger than the second preset threshold and smaller than or equal to a third preset threshold, determining that the opening and closing mode of the on-off valve group is a third mode;

wherein the third mode is: the first on-off valve, the second on-off valve and the third on-off valve are opened, and the fourth on-off valve is closed.

6. The method of controlling start-up of an air conditioner according to claim 5, wherein the step of determining the on-off mode of the on-off valve group based on the interval in which the first ratio is located further comprises:

if the first ratio is larger than the third preset threshold, determining that the opening and closing mode of the on-off valve group is a fourth mode;

wherein the fourth mode is: the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve are all opened.

7. The method of controlling the start-up of an air conditioner according to claim 6, wherein after the step of controlling the on-off valve group to operate in the fourth mode, the method further comprises:

continuously acquiring the high pressure and the low pressure of the air conditioner;

calculating a third ratio of the high pressure to the low pressure;

comparing the third ratio with the third preset threshold value;

and selectively controlling the compressor to stop according to the comparison result.

8. The method of controlling the start of an air conditioner as set forth in claim 7, wherein the step of selectively controlling the start of the compressor according to the comparison result further includes:

and if the third ratio is larger than the third preset threshold, controlling the compressor to stop, and controlling the indoor fan and the outdoor fan to start until the third ratio is smaller than or equal to the third preset threshold, and controlling the compressor to restart.

9. The startup control method of an air conditioner according to any one of claims 3 to 8, characterized in that the startup control method further comprises:

after the compressor is controlled to start, acquiring a plurality of high-pressure pressures and a plurality of low-pressure pressures of the air conditioner;

calculating a pressure ratio change rate of the air conditioner based on the plurality of high pressure pressures and the plurality of low pressure pressures;

comparing the pressure ratio change rate with a preset pressure ratio threshold value;

and when the pressure ratio change rate is smaller than the preset pressure ratio threshold value, controlling the on-off valve group to be switched to an opening and closing state before the compressor is started.

10. The start-up control method of an air conditioner according to claim 1, wherein the step of acquiring the high-pressure and low-pressure of the air conditioner further comprises:

and obtaining the maximum value of the high pressure and the maximum value of the low pressure in a preset time.