WO2018090626A1 - Anti-slugging control method and control apparatus for air-conditioning system, and air-conditioning system - Google Patents

Abstract

An anti-slugging control method and control apparatus for an air-conditioning system and an air-conditioning system. The control method comprises the following steps: obtaining a discharge superheat DSH of a compressor in real time, and monitoring the discharge superheat DSH during operation of the air-conditioning system (S10); controlling a timer to start timing if the discharge superheat DSH is less than a first preset value M1 continuously for a first preset time t1 (S20); and controlling an outdoor unit of the air-conditioning system to stop to prevent slugging from occurring in the compressor when a measured time t of the timer reaches a second preset time t2 (S30). The discharge superheat DSH in the air-conditioning system is monitored in real time, such that a refrigerant drawn back to an air return port of the compressor can be ensured to be in a completely gaseous state, thereby preventing a liquid refrigerant from entering the compressor and preventing slugging. In addition, because a value of the discharge superheat is relatively large, it is convenient to inspect and control data, thereby improving the precision of anti-slugging control, and operation safety and reliability of the air-conditioning system.

Description

Liquid-proof control method and control device for air-conditioning system and air-conditioning system

Cross-reference to related applications

This application is based on two Chinese patent applications with application numbers 201611027983.3 and 201611034105.4, all of which are filed on November 17, 2016, and require the priority of the two Chinese patent applications. The entire contents of the two Chinese patent applications are This application is hereby incorporated by reference.

Technical field

The invention relates to the technical field of air conditioners, in particular to a liquid-proof control method for an air-conditioning system, a liquid-proof control device for an air-conditioning system and an air-conditioning system.

Background technique

In an air conditioning system, excessive refrigerant or lubricating oil, excessive adjustment (opening degree) of the expansion valve (or regulating valve), unstable thermal load of the evaporator, etc. may cause liquid refrigerant to enter the compressor cylinder. The compressor is subjected to liquid hammering. Long-term, heavier liquid impacts may cause deformation and cracking of the valve pieces and the like of the compressor, and even cause permanent damage to the compressor.

In the related art, the regenerative superheat of the air conditioning system is monitored in real time to ensure that the refrigerant sucked into the return port of the compressor is in a pure gas state, thereby preventing the liquid refrigerant from entering the compressor and avoiding the liquid hammer of the compressor. However, the value of the return air superheat of the air conditioning system is generally small, which is inconvenient for data detection and control, resulting in lower accuracy of the anti-liquid hammer control of the compressor and poor reliability.

Therefore, the compressor liquid-repellent control technology of the related art needs to be improved.

Summary of the invention

The present invention aims to solve at least one of the technical problems in the related art to some extent.

In order to achieve the above object, an embodiment of the first aspect of the present invention provides a liquid-repellent control method for an air-conditioning system, comprising the steps of: acquiring a superheat of exhaust gas of a compressor in real time, and performing a process in the operation of the air-conditioning system. The exhaust superheat is monitored; if the exhaust superheat is less than the first preset value and continues for the first preset time, the control timer starts counting; when the timer is timed to reach the second preset time At the time, the outdoor unit of the air conditioning system is controlled to stop to prevent liquid hammering of the compressor.

In at least one embodiment, during the timing of the timer, if the exhaust superheat is greater than or equal to the first preset value for a third preset time, the timer is cleared. Zero, and continue to judge the exhaust superheat Whether the degree satisfies the condition that the timer starts counting.

In at least one embodiment, after controlling the shutdown of the outdoor unit, it is further determined whether the number of times the air conditioning system performs liquid-protection protection exceeds a preset time in a fourth preset time, wherein if the fourth preset If the number of times the air-conditioning system performs liquid-protection protection exceeds a preset time, the outdoor unit is controlled to be unable to resume power-on when the power is off; if the air-conditioning system is prevented during the fourth preset time If the number of times of liquid hammer protection does not exceed a preset time, the timer is cleared, and the outdoor unit is restarted after the fifth preset time.

In at least one embodiment, the air conditioning system includes a compressor, a condenser, and an evaporator, the real-time acquiring exhaust superheat of the compressor, including: detecting an exhaust port temperature of the compressor, and detecting the a central temperature of the condenser and a central temperature of the evaporator; when the air conditioning system is in a cooling operation, calculating an exhaust superheat of the compressor according to the exhaust port temperature and a central temperature of the condenser; During the heating operation of the air conditioning system, the exhaust superheat of the compressor is calculated according to the exhaust port temperature and the middle temperature of the evaporator.

In at least one embodiment, the obtaining the exhaust superheat of the compressor in real time comprises: detecting an exhaust port pressure of the compressor, and detecting an exhaust port temperature of the compressor; The pressure and the exhaust port temperature calculate the exhaust superheat of the compressor.

In at least one embodiment, the first preset time may be 20 minutes, the second preset time may be 30 minutes, and the third preset time may be 5 minutes, the fourth preset time It may be 120 minutes, and the fifth preset time may be 6 minutes.

The liquid-proof control method of the air-conditioning system according to the embodiment of the present invention obtains the exhaust superheat degree of the compressor in real time, and monitors the superheat degree of the exhaust air during the operation of the air-conditioning system, if the superheat degree of the exhaust gas is less than the first preset The value continues for the first preset time, and the control timer starts counting, and when the timer time reaches the second preset time, the outdoor unit of the air conditioning system is controlled to stop to prevent the compressor from being hit. It can be seen that the liquid-repellent control method of the air-conditioning system according to the embodiment of the present invention performs liquid-protection protection by monitoring the exhaust superheat degree of the compressor in real time, thereby ensuring that the refrigerant returning to the compressor return port is purely gaseous. Prevent liquid refrigerant from entering the compressor and avoid liquid hammer from the compressor. Moreover, due to the large value of the superheat of the exhaust gas, it is convenient to perform data detection and liquid-proof control, improve the accuracy of liquid-proof control, and improve the safety and reliability of the operation of the air-conditioning system.

In order to achieve the above object, a second aspect of the present invention provides a non-transitory computer readable storage medium having stored thereon a computer program, which is executed by a processor to implement the first aspect of the invention. Anti-liquid hammer control method for air conditioning systems.

In order to achieve the above object, an embodiment of a third aspect of the present invention provides a liquid-repellent control device for an air-conditioning system, comprising: an acquisition module for acquiring exhaust superheat of a compressor in real time; and a monitoring module for The superheat of the exhaust gas is monitored during operation of the air conditioning system; the control module is configured to control the timer to start timing when the superheat of the exhaust gas is less than a first preset value and last for a first preset time, and Controlling when the timer time of the timer reaches the second preset time The outdoor unit of the air conditioning system is shut down to prevent liquid hammer from occurring in the compressor.

In at least one embodiment, during the timing of the timer, if the exhaust superheat is greater than or equal to the first preset value for a third preset time, the control module The timer is cleared and continues to determine whether the exhaust superheat meets the condition that the timer starts counting.

In at least one embodiment, after controlling the shutdown of the outdoor unit, the control module further determines whether the number of times the air conditioning system performs liquid-protection protection exceeds a preset time in a fourth preset time, wherein if The number of times the air conditioning system performs liquid-protection protection exceeds a preset time in the fourth preset time, and the control module controls the outdoor unit to be unable to resume power-on in the case of non-power-off; if the fourth preset The number of times the air conditioning system performs liquid-proof protection does not exceed a preset time, and the control module clears the timer and controls the outdoor unit to restart after the fifth preset time.

In at least one embodiment, the air conditioning system includes a compressor, a condenser, and an evaporator, the apparatus further including: a first temperature sensor disposed at an exhaust port of the compressor, the first temperature sensor Detecting an exhaust port temperature of the compressor; a second temperature sensor disposed in a middle portion of the evaporator, the second temperature sensor for detecting a middle temperature of the evaporator; and being disposed at a middle portion of the condenser a third temperature sensor, wherein the third temperature sensor is configured to detect a central temperature of the condenser; wherein the acquisition module is further configured to: according to the exhaust port temperature and the condensation during a cooling operation of the air conditioning system The middle temperature of the compressor calculates the exhaust superheat of the compressor, and calculates the exhaust superheat of the compressor according to the exhaust port temperature and the middle temperature of the evaporator during the heating operation of the air conditioning system .

In at least one embodiment, the liquid-repellent control device of the air conditioning system further includes a temperature sensor and a pressure sensor disposed at an exhaust port of the compressor, the temperature sensor for detecting exhaust of the compressor a port temperature, the pressure sensor is configured to detect an exhaust port pressure of the compressor, and the obtaining module is configured to calculate an exhaust superheat degree of the compressor according to the exhaust port pressure and the exhaust port temperature .

In at least one embodiment, the first preset time may be 20 minutes, the second preset time may be 30 minutes, and the third preset time may be 5 minutes, and the fourth preset time may be For 120 minutes, the fifth preset time may be 6 minutes.

The liquid-proof control device for the air-conditioning system of the embodiment of the present invention acquires the exhaust superheat degree of the compressor in real time through the acquisition module, and monitors the superheat degree of the exhaust gas during the operation of the air-conditioning system through the monitoring module, and controls the superheat degree of the exhaust gas in the module. The control timer starts counting when it is less than the first preset value and continues for the first preset time, and controls the outdoor unit shutdown of the air conditioning system to prevent the compressor from being hit when the timer time reaches the second preset time. It can be seen that the liquid-repellent control device of the air-conditioning system according to the embodiment of the present invention performs liquid-protection protection by monitoring the exhaust superheat degree of the compressor in real time, thereby ensuring that the refrigerant returning to the compressor return port is purely gaseous. Prevent liquid refrigerant from entering the compressor and avoid liquid hammer from the compressor. Moreover, due to the large value of the superheat of the exhaust gas, it is convenient to perform data detection and liquid-proof control, improve the accuracy of liquid-proof control, and improve the safety and reliability of the operation of the air-conditioning system.

In order to achieve the above object, an embodiment of the fourth aspect of the present invention provides an air conditioning system including the air conditioner of the embodiment. The system's anti-slamming control device.

The air conditioning system of the embodiment of the present invention monitors the exhaust superheat of the compressor in real time through the liquid-repellent control device of the air conditioner to perform liquid-protection protection, thereby ensuring that the refrigerant returning to the compressor return port is purely gaseous. Prevent liquid refrigerant from entering the compressor and avoid liquid hammer from the compressor. Moreover, due to the large value of the superheat of the exhaust gas, it is convenient to perform data detection and liquid-proof control, improve the accuracy of liquid-proof control, and improve the safety and reliability of the operation of the air-conditioning system.

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

1 is a flow chart of a liquid striking control method of an air conditioning system according to an embodiment of the present invention;

2 is a schematic diagram showing a pressure map of an air conditioning system according to an embodiment of the present invention;

3 is a flow chart of a liquid striking control method of an air conditioning system according to another embodiment of the present invention;

4 is a flow chart of a liquid pressure control method for an air conditioning system according to an embodiment of the present invention; FIG. 5 is a block diagram of a liquid pressure control device for an air conditioning system according to an embodiment of the present invention;

Figure 6 is a schematic structural view of an air conditioning system according to an embodiment of the present invention;

Figure 7 is a block diagram showing a liquid-tight control device of an air conditioning system according to another embodiment of the present invention;

8 is a schematic structural view of an air conditioning system according to another embodiment of the present invention;

9 is a block schematic diagram of an air conditioning system in accordance with an embodiment of the present invention.

Reference mark:

Obtaining module 10, monitoring module 20, control module 30, fourth temperature sensor 40, pressure sensor 50 and timer 60;

a first temperature sensor 70, a second temperature sensor 80, a third temperature sensor 90, a calculation module 11;

The compressor 100, the evaporator 200, the condenser 300, the air conditioning system 400, and the liquid-repellent control device 500 of the air conditioning system.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

The liquid-repellent control method for an air-conditioning system, the liquid-proof control device for an air-conditioning system, and an air-conditioning system according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

1 is a flow chart of a liquid striking control method of an air conditioning system according to an embodiment of the present invention. As shown in FIG. 1, the liquid striking control method of the air conditioning system includes the following steps:

S10: The exhaust superheat degree DSH of the compressor is obtained in real time, and the exhaust superheat DSH is monitored during the operation of the air conditioning system.

According to an embodiment of the present invention, acquiring the exhaust superheat degree DSH of the compressor in real time includes: detecting the exhaust port pressure P of the compressor, and detecting the exhaust port temperature Tc of the compressor; according to the exhaust port pressure P and the row The port temperature Tc calculates the exhaust superheat DSH of the compressor.

Specifically, based on the analysis of the working process of the air conditioning system, the pressure map shown in FIG. 2 can be obtained, wherein the ordinate is the logarithmic value LogP of the absolute pressure of the air conditioning system, and the abscissa is the comparison value h of the air conditioning system. As shown in Fig. 2, the air conditioning system is in the stage of overheating and exothermic in section 1-2. At this time, the exhaust port of the compressor discharges the high temperature and high pressure gaseous refrigerant; the air conditioning system is in the stage of constant pressure and heat release in sections 2-4; The air conditioning system is in the constant pressure endothermic stage in the 5-6 section; the air conditioning system is in the superheating endothermic stage in the 6-7 section. At this time, the refrigerant returning port of the compressor draws in the refrigerant. As shown in Figure 2, the exhaust superheat DSH of the air conditioning system corresponds to the return superheat SSH, and the value of the exhaust superheat DSH is greater than the value of the return superheat SSH. Therefore, if the exhaust superheat DSH is in advance Within the range, it is ensured that the refrigerant sucked into the compressor return port is purely gaseous.

During the operation of the air conditioning system, the exhaust port pressure P and the exhaust port temperature Tc of the compressor are detected in real time, and the acquisition module can obtain the corresponding exhaust saturation temperature value Tp according to the exhaust port pressure P of the compressor in real time, and The difference between the exhaust port temperature Tc and the exhaust saturation temperature value Tp is calculated as the real-time exhaust superheat degree DSH, and the liquid flood control can be performed using the real-time exhaust superheat degree DSH.

S20: If the exhaust superheat degree DSH is less than the first preset value M1 and continues for the first preset time t1, the control timer starts counting.

S30: When the time t of the timer reaches the second preset time t2, the outdoor unit of the air conditioning system is controlled to stop to prevent the compressor from being hit.

According to a specific embodiment of the present invention, the first preset time t1 may be 20 minutes, the second preset time t2 may be 30 minutes, and the first preset value M1 may be A °C.

Specifically, the exhaust superheat degree DSH of the compressor is obtained in real time, and the exhaust superheat degree DSH is monitored during the operation of the air conditioning system to determine whether the exhaust superheat DSH of the air conditioning system is greater than or equal to the first preset value M1. If the exhaust superheat DSH is greater than or equal to the first preset value M1 (for example, A ° C), it indicates that the return air superheat SSH of the air conditioning system is sufficiently large to control the outdoor unit of the air conditioning system to maintain normal operation, at this time, the compressor The refrigerant sucked in the air return port is in a pure gas state; if the exhaust gas superheat degree DSH is less than the first preset value M1, it is further determined whether the duration reaches the first preset time t1 (for example, 20 minutes), if the duration reaches the first preset Set time t1, the control timer starts counting.

Further, determining whether the timer time t of the timer reaches the second preset time t2 (for example, 30 minutes), when the timer time t reaches the second preset time t2, that is, the exhaust superheat DSH is smaller than the first When the duration of the preset value M1 reaches the second preset time t2, the return air superheat SSH of the air conditioning system is low, and the outdoor unit of the air conditioning system is controlled to stop, so as to prevent the return air inlet of the compressor from sucking the liquid refrigerant, thereby Avoid liquid hammering of the compressor.

According to an embodiment of the present invention, in the process of timing the timer, if the exhaust superheat degree DSH is greater than or equal to the first preset value M1 and continues for the third preset time t3, the timer is cleared and continues. It is judged whether or not the exhaust superheat degree DSH satisfies the condition that the timer starts counting.

According to a specific embodiment of the invention, the third preset time t3 may be 5 minutes.

Specifically, during the timing of the timer, the exhaust superheat DSH is monitored in real time, and if the exhaust superheat DSH is greater than or equal to the first preset value M1 (eg, A degrees Celsius), it is further determined whether the duration reaches the third. For a preset time t3 (for example, 5 minutes), if the exhaust superheat degree DSH is greater than or equal to the first preset value M1 (for example, A degrees Celsius) and continues for the third preset time t3, the timer is cleared and the row is re-determined. Whether the air superheat DSH satisfies the condition that the timer starts counting.

According to an embodiment of the present invention, after controlling the shutdown of the outdoor unit, it is further determined whether the number N of air-proof protection of the air-conditioning system during the fourth preset time t4 exceeds a preset time (for example, 1 time), wherein if the fourth During the preset time t4, the number N of anti-liquid protection protections of the air-conditioning system exceeds a preset time (for example, 1 time), then the outdoor unit is controlled to be unable to resume power-on in the case of non-power-off; if the air-conditioning system is in the fourth preset time t4 If the number of times of performing liquid-proof protection N does not exceed a preset number (for example, 1 time), the timer is cleared, and the outdoor unit is restarted after the fifth preset time t5.

According to a specific embodiment of the present invention, the fourth preset time t4 may be 120 minutes, and the fifth preset time t5 may be 6 minutes.

Specifically, the number of times of anti-liquid protection of the air-conditioning system by the counter (ie, the number of times the outdoor unit is controlled to stop) N can be counted, and if the air-conditioning system is protected against liquid-suppression during the fourth preset time t4 (for example, 120 minutes) The number of times N exceeds the preset number (for example, 1 time), indicating that the air-conditioning system's return air superheat SSH is continuously low, then the outdoor unit is controlled to be unable to resume power-on in the case of non-power-off, that is, the outdoor unit needs to be first Power off processing can restore the outdoor unit to power on. If the number N of air-proof protection of the air-conditioning system during the fourth preset time t4 (for example, 120 minutes) does not exceed a preset time (for example, 1 time), the timer is cleared, and at the fifth preset time t5 After (for example, 6 minutes), the outdoor unit is automatically controlled to restart, and it is re-determined whether the exhaust superheat DSH satisfies the condition that the timer starts counting.

As described above, as shown in FIG. 4, the liquid-repellent control method of the air conditioner according to the embodiment of the present invention may specifically include the following steps:

S101: Turn on the liquid-proof protection control.

S102: Acquire the exhaust superheat degree DSH of the compressor in real time, and monitor the exhaust superheat degree DSH during the operation of the air conditioning system.

S103: Determine whether the exhaust superheat degree DSH is smaller than the first preset value M1.

If yes, step S104 is performed; if no, step S105 is performed.

S104: Determine whether the duration reaches the first preset time t1.

If yes, go to step S106; if no, go to step S103.

S105: The outdoor unit that controls the air conditioning system maintains normal operation.

S106: The control timer starts counting.

S107: Determine whether the exhaust superheat degree DSH is greater than or equal to the first preset value M1.

If yes, step S108 is performed; if no, step S110 is performed.

S108: Determine whether the duration reaches the third preset time t3.

If yes, go to step S109; if no, go to step S107.

S109: The control timer is cleared, and step S102 is performed.

S110: Determine whether the time t of the timer reaches the second preset time t2.

If yes, step S111 is performed; if no, step S107 is performed.

S111: Control the outdoor unit of the air conditioning system to stop.

S112: Determine whether the number N of air-proof protection of the air-conditioning system during the fourth preset time t4 exceeds a preset time (for example, one time).

If yes, go to step S113; if no, go to step S114.

S113: The outdoor unit is controlled to be restarted without being powered off.

S114: The control timer is cleared, and the outdoor unit is restarted after the fifth preset time t5, and step S102 is performed.

S115: The liquid-proof control is over.

In summary, according to the liquid striking control method of the air conditioning system according to the embodiment of the present invention, the exhaust superheat degree of the compressor is obtained in real time, and the superheat degree of the exhaust gas is monitored during the operation of the air conditioning system, if the exhaust superheat degree If it is less than the first preset value and continues for the first preset time, the control timer starts counting, and when the timer time reaches the second preset time, the outdoor unit of the air conditioning system is controlled to stop to prevent the compressor from being hit by the liquid. . It can be seen that the liquid-repellent control method of the air-conditioning system according to the embodiment of the present invention performs liquid-protection protection by monitoring the exhaust superheat degree of the compressor in real time, thereby ensuring that the refrigerant of the compressor return air port is purely gaseous and prevents liquid state. The refrigerant enters the compressor to avoid liquid hammering of the compressor. Moreover, due to the large value of the superheat of the exhaust gas, it is convenient to perform data detection and liquid-proof control, improve the accuracy of liquid-proof control, and improve the safety and reliability of the operation of the air-conditioning system.

3 is a flow chart of a liquid striking control method of an air conditioning system according to another embodiment of the present invention. The air conditioning system includes a compressor, a condenser and an evaporator. As shown in FIG. 3, the liquid pressure control method of the air conditioning system includes the following steps:

S1: Detecting the exhaust port temperature Tc of the compressor, and detecting the central temperature T1 of the condenser and the central temperature T2 of the evaporator.

S2: When the air conditioning system is in cooling operation, the exhaust superheat degree DSH of the compressor is calculated according to the exhaust port temperature Tc and the central temperature T1 of the condenser.

S3: When the air conditioning system is heating, the exhaust superheat DSH of the compressor is calculated according to the exhaust port temperature Tc and the central temperature T2 of the evaporator.

Specifically, according to the working process analysis of the air conditioning system, the pressure map shown in FIG. 2 can be obtained, wherein the ordinate is an air conditioner. The logarithm of the absolute pressure of the system is LogP, and the abscissa is the specific value h of the air conditioning system. As shown in Fig. 2, the air conditioning system is in the stage of overheating and exothermic in section 1-2. At this time, the exhaust port of the compressor discharges the high temperature and high pressure gaseous refrigerant; the air conditioning system is in the stage of constant pressure and heat release in sections 2-4; The air conditioning system is in the constant pressure endothermic stage in the 5-6 section; the air conditioning system is in the superheating endothermic stage in the 6-7 section. At this time, the refrigerant returning port of the compressor draws in the refrigerant. As shown in Figure 2, the exhaust superheat DSH of the air conditioning system corresponds to the return superheat SSH, and the value of the exhaust superheat DSH is greater than the value of the return superheat SSH. Therefore, if the exhaust superheat DSH is in advance Within the range, it is ensured that the refrigerant sucked into the compressor return port is purely gaseous.

During the operation of the air conditioning system, the exhaust port temperature Tc of the compressor is detected in real time, and the central temperature T1 of the condenser and the central temperature T2 of the evaporator are detected. When the air conditioning system is cooled, the central temperature T1 of the condenser is equivalent. The saturation temperature on the high pressure side of the air conditioning system, that is, the central temperature T1 of the condenser can be used as the exhaust gas saturation temperature. At this time, the exhaust superheat degree DSH of the compressor can be approximated as the exhaust port temperature Tc of the compressor and the middle of the condenser. The difference of temperature T1 (Tc-T1); when the air conditioning system is heating, the middle temperature T2 of the evaporator is equivalent to the saturation temperature of the high pressure side of the air conditioning system, that is, the middle temperature T2 of the evaporator can be used as the exhaust saturation temperature. The exhaust superheat DSH of the compressor can be approximated as the difference between the exhaust port temperature Tc of the compressor and the central temperature T2 of the evaporator (Tc-T2), and can be prevented by real-time exhaust superheat DSH. Liquid stroke control.

S4: The exhaust superheat DSH is monitored during the operation of the air conditioning system.

S5: if the exhaust superheat degree DSH is less than the first preset value M1 and continues for the first preset time t1, the control timer starts timing, and controls the air conditioning system when the timer time t reaches the second preset time t2 The outdoor unit is shut down to prevent liquid hammer from occurring in the compressor.

According to a specific embodiment of the present invention, the first preset time t1 may be 20 minutes, the second preset time t2 may be 30 minutes, and the first preset value M1 may be A °C.

Specifically, the exhaust superheat degree DSH of the compressor is obtained in real time, and the exhaust superheat degree DSH is monitored during the operation of the air conditioning system to determine whether the exhaust superheat DSH of the air conditioning system is greater than or equal to the first preset value M1. If the exhaust superheat DSH is greater than or equal to the first preset value M1 (for example, A ° C), it indicates that the return air superheat SSH of the air conditioning system is sufficiently large to control the outdoor unit of the air conditioning system to maintain normal operation, at this time, the compressor The refrigerant sucked in the air return port is in a pure gas state; if the exhaust gas superheat degree DSH is less than the first preset value M1, it is further determined whether the duration reaches the first preset time t1 (for example, 20 minutes), if the duration reaches the first preset Set time t1, the control timer starts counting.

Further, determining whether the timer time t of the timer reaches the second preset time t2 (for example, 30 minutes), when the timer time t reaches the second preset time t2, that is, the exhaust superheat DSH is smaller than the first When the duration of the preset value M1 reaches the second preset time t2, the return air superheat SSH of the air conditioning system is low, and the outdoor unit of the air conditioning system is controlled to stop, so as to prevent the return air inlet of the compressor from sucking the liquid refrigerant, thereby Avoid liquid hammering of the compressor.

According to an embodiment of the present invention, in the process of timing the timer, if the exhaust superheat degree DSH is greater than or equal to the first preset value M1 and continues for the third preset time t3, the timer is cleared and continues. Judging exhaust superheat DSH Whether the condition that the timer starts counting is satisfied.

According to a specific embodiment of the invention, the third preset time t3 may be 5 minutes.

Specifically, during the timing of the timer, the exhaust superheat DSH is monitored in real time, and if the exhaust superheat DSH is greater than or equal to the first preset value M1 (eg, A degrees Celsius), it is further determined whether the duration reaches the third. For a preset time t3 (for example, 5 minutes), if the exhaust superheat degree DSH is greater than or equal to the first preset value M1 (for example, A degrees Celsius) and continues for the third preset time t3, the timer is cleared and the row is re-determined. Whether the air superheat DSH satisfies the condition that the timer starts counting.

According to an embodiment of the present invention, after controlling the shutdown of the outdoor unit, it is further determined whether the number N of air-proof protection of the air-conditioning system during the fourth preset time t4 exceeds a preset time (for example, 1 time), wherein if the fourth During the preset time t4, the number N of anti-liquid protection protections of the air-conditioning system exceeds a preset time (for example, 1 time), then the outdoor unit is controlled to be unable to resume power-on in the case of non-power-off; if the air-conditioning system is in the fourth preset time t4 If the number of times of performing liquid-proof protection N does not exceed a preset number (for example, 1 time), the timer is cleared, and the outdoor unit is restarted after the fifth preset time t5.

According to a specific embodiment of the present invention, the fourth preset time t4 may be 120 minutes, and the fifth preset time t5 may be 6 minutes.

Specifically, the number of times of anti-liquid protection of the air-conditioning system by the counter (ie, the number of times the outdoor unit is controlled to stop) N can be counted, and if the air-conditioning system is protected against liquid-suppression during the fourth preset time t4 (for example, 120 minutes) The number of times N exceeds the preset number (for example, 1 time), indicating that the air-conditioning system's return air superheat SSH is continuously low, then the outdoor unit is controlled to be unable to resume power-on in the case of non-power-off, that is, the outdoor unit needs to be first Power off processing can restore the outdoor unit to power on. If the number N of air-proof protection of the air-conditioning system during the fourth preset time t4 (for example, 120 minutes) does not exceed a preset time (for example, 1 time), the timer is cleared, and at the fifth preset time t5 After (for example, 6 minutes), the outdoor unit is automatically controlled to restart, and it is re-determined whether the exhaust superheat DSH satisfies the condition that the timer starts counting.

As described above, as shown in FIG. 4, the liquid-repellent control method of the air conditioner according to the embodiment of the present invention may specifically include the following steps:

S101: Turn on the liquid-proof protection control.

S102: Acquire the exhaust superheat degree DSH of the compressor in real time, and monitor the exhaust superheat degree DSH during the operation of the air conditioning system.

S103: Determine whether the exhaust superheat degree DSH is smaller than the first preset value M1.

If yes, step S104 is performed; if no, step S105 is performed.

S104: Determine whether the duration reaches the first preset time t1.

If yes, go to step S106; if no, go to step S103.

S105: The outdoor unit that controls the air conditioning system maintains normal operation.

S106: The control timer starts counting.

S107: Determine whether the exhaust superheat degree DSH is greater than or equal to the first preset value M1.

If yes, step S108 is performed; if no, step S110 is performed.

S108: Determine whether the duration reaches the third preset time t3.

If yes, go to step S109; if no, go to step S107.

S109: The control timer is cleared, and step S102 is performed.

S110: Determine whether the time t of the timer reaches the second preset time t2.

If yes, step S111 is performed; if no, step S107 is performed.

S111: Control the outdoor unit of the air conditioning system to stop.

S112: Determine whether the number N of air-proof protection of the air-conditioning system during the fourth preset time t4 exceeds a preset time (for example, one time).

If yes, go to step S113; if no, go to step S114.

S113: The outdoor unit is controlled to be restarted without being powered off.

S114: The control timer is cleared, and the outdoor unit is restarted after the fifth preset time t5, and step S102 is performed.

S115: The liquid-proof control is over.

In summary, the liquid-repellent control method of the air-conditioning system according to the embodiment of the present invention detects the temperature of the exhaust port of the compressor and detects the central temperature of the condenser and the central temperature of the evaporator. When the air-conditioning system is in cooling operation, Calculate the exhaust superheat of the compressor according to the temperature of the exhaust port and the central temperature of the condenser, and calculate the superheat of the exhaust of the compressor according to the temperature of the exhaust port and the middle temperature of the evaporator when the air conditioning system is running. The exhaust superheat is monitored during operation of the air conditioning system. If the superheat of the exhaust is less than the first preset value and continues for the first preset time, the control timer starts counting and reaches the second pre-timing time. Set the time to control the outdoor unit shutdown of the air conditioning system to prevent liquid hammer from occurring in the compressor. It can be seen that the liquid-repellent control method of the air-conditioning system according to the embodiment of the present invention performs liquid-protection protection by monitoring the exhaust superheat degree of the compressor in real time, thereby ensuring that the refrigerant returning to the compressor return port is purely gaseous. Prevent liquid refrigerant from entering the compressor and avoid liquid hammer from the compressor. Moreover, due to the large value of the superheat of the exhaust gas, the data detection and control are facilitated, the accuracy of the liquid-proof control is improved, and the safety and reliability of the operation of the air-conditioning system are improved.

The embodiment of the present invention further provides a non-transitory computer readable storage medium, on which a computer program is stored, which is executed by the processor to implement the liquid-proof control method of the air-conditioning system according to the embodiment of the present invention.

Figure 5 is a block schematic diagram of a liquid-tight control device of an air conditioning system in accordance with one embodiment of the present invention. As shown in FIG. 5, the liquid-repellent control device includes: an acquisition module 10, a monitoring module 20, and a control module 30, wherein the acquisition module 10 is configured to acquire the exhaust superheat degree DSH of the compressor in real time; and the monitoring module 20 is configured to The exhaust superheat DSH is monitored during operation of the air conditioning system; the control module 30 is configured to control the timer 60 to start timing when the exhaust superheat DSH is less than the first preset value M1 for the first preset time t1, and When the time counted by the timer 60 reaches the second preset time t2, the outdoor unit of the air conditioning system is controlled to stop to prevent the compressor from being hit.

According to a specific embodiment of the present invention, the first preset time t1 may be 20 minutes, the second preset time t2 may be 30 minutes, and the first preset value M1 may be A °C.

Specifically, the acquisition module 10 acquires the exhaust superheat degree DSH of the compressor in real time, and the monitoring module 20 monitors the exhaust superheat degree DSH during the operation of the air conditioning system, and determines whether the exhaust superheat degree DSH of the air conditioning system is greater than or equal to the first A preset value M1, if the exhaust superheat degree DSH is greater than or equal to the first preset value M1 (for example, A ° C), indicating that the return air superheat SSH of the air conditioning system is sufficiently large, and the control module 30 controls the outdoor unit of the air conditioning system to remain normal. Operation, at this time, the refrigerant sucked into the air return port of the compressor is pure gas state; if the exhaust gas superheat degree DSH is less than the first preset value M1, the control module 30 further determines whether the duration reaches the first preset time t1 (for example 20 minutes), if the duration reaches the first preset time t1, the control module 30 controls the timer 60 to start timing.

Further, the control module 30 determines whether the time t of the timer 60 reaches the second preset time t2 (for example, 30 minutes), and when the time t of the timer 60 reaches the second preset time t2, that is, exhausted When the duration of the heat DSH is less than the first preset value M1 reaches the second preset time t2, the return air superheat SSH of the corresponding air conditioning system is low, and the control module 30 controls the outdoor unit of the air conditioning system to stop to prevent the compressor from being The return air port draws in liquid refrigerant to avoid liquid hammering of the compressor.

According to an embodiment of the present invention, as shown in FIG. 6, the liquid-repellent control device of the air-conditioning system further includes a fourth temperature sensor 40 and a pressure sensor 50 disposed at an exhaust port of the compressor, and the fourth temperature sensor 40 is used for Detecting the exhaust port temperature Tc of the compressor, the pressure sensor 50 is for detecting the exhaust port pressure P of the compressor, and the obtaining module 10 is configured to calculate the exhaust superheat of the compressor according to the exhaust port pressure P and the exhaust port temperature Tc. DSH.

According to a specific embodiment of the invention, the fourth temperature sensor 40 can be a vent temperature sensing package.

Based on the analysis of the working process of the air conditioning system, the pressure map shown in Fig. 2 can be obtained, wherein the ordinate is the logarithmic value LogP of the absolute pressure of the air conditioning system, and the abscissa is the comparison value h of the air conditioning system. As shown in Fig. 2, the air conditioning system is in the stage of overheating and exothermic in section 1-2. At this time, the exhaust port of the compressor discharges the high temperature and high pressure gaseous refrigerant; the air conditioning system is in the stage of constant pressure and heat release in sections 2-4; The air conditioning system is in the constant pressure endothermic stage in the 5-6 section; the air conditioning system is in the superheating endothermic stage in the 6-7 section. At this time, the refrigerant returning port of the compressor draws in the refrigerant. As shown in Figure 2, the exhaust superheat DSH of the air conditioning system corresponds to the return superheat SSH, and the value of the exhaust superheat DSH is greater than the value of the return superheat SSH. Therefore, if the exhaust superheat DSH is in advance Within the range, it is ensured that the refrigerant sucked into the compressor return port is purely gaseous.

During the operation of the air conditioning system, the exhaust port pressure P and the exhaust port temperature Tc of the compressor are detected in real time, and the acquisition module can obtain the corresponding exhaust saturation temperature value Tp according to the exhaust port pressure P of the compressor in real time, and The difference between the exhaust port temperature Tc and the exhaust saturation temperature value Tp is calculated as the real-time exhaust superheat degree DSH, and the liquid flood control can be performed using the real-time exhaust superheat degree DSH.

According to an embodiment of the present invention, during the timing of the timer 60, if the exhaust superheat DSH is greater than or equal to the first preset value M1 and continues for the third preset time t3, the control module 30 performs the timer 60. Clear and continue It is judged whether or not the exhaust superheat degree DSH satisfies the condition that the timer 60 starts counting.

According to a specific embodiment of the invention, the third preset time t3 may be 5 minutes.

Specifically, during the timing of the timer 60, the monitoring module 20 monitors the exhaust superheat DSH in real time. If the exhaust superheat DSH is greater than or equal to the first preset value M1 (eg, A degrees Celsius), the control module 30 further Determining whether the duration reaches the third preset time t3 (for example, 5 minutes). If the exhaust superheat degree DSH is greater than or equal to the first preset value M1 (for example, A degrees Celsius) and continues for the third preset time t3, the control module 30 is The timer 60 performs a clearing and re-determines whether the exhaust superheat degree DSH satisfies the condition that the timer 60 starts counting.

According to an embodiment of the present invention, after the control of the outdoor unit is stopped, the control module 30 further determines whether the number N of the air-conditioning protection of the air-conditioning system during the fourth preset time t4 exceeds a preset time (for example, one time), wherein If the number N of air-proof protection of the air-conditioning system during the fourth preset time t4 exceeds a preset time (for example, 1 time), the control module 30 controls the outdoor unit to be unable to resume power-on in the case of non-power-off; if the fourth pre- It is assumed that the number N of air-proof protection of the air-conditioning system during the time t4 does not exceed a preset time (for example, one time), the control module 30 clears the timer 60, and controls the outdoor unit after the fifth preset time t5. start up.

According to a specific embodiment of the present invention, the fourth preset time t4 may be 120 minutes, and the fifth preset time t5 may be 6 minutes.

Specifically, the number of times the counter performs liquid-protection protection on the air-conditioning system (ie, the number of times the outdoor unit is controlled to stop) N is counted, and if the air-conditioning system performs the liquid-proof protection for the fourth preset time t4 (for example, 120 minutes) N exceeds the preset time (for example, 1 time), indicating that the air-conditioning system's return air superheat SSH is continuously low, and the control module 30 controls the outdoor unit to be unable to resume power-on in the case of non-power-off, that is, the outdoor unit needs to be first Powering off the power to restore the outdoor unit to power on. If the number N of air-proof protection of the air-conditioning system during the fourth preset time t4 (for example, 120 minutes) does not exceed a preset time (for example, 1 time), the control module 30 clears the timer 60 and is in the fifth. After the preset time t5 (for example, 6 minutes), the outdoor unit is automatically restarted, and it is re-determined whether the exhaust superheat DSH satisfies the condition that the timer 60 starts counting.

In summary, the liquid-repellent control device of the air-conditioning system according to the embodiment of the present invention acquires the exhaust superheat of the compressor in real time through the acquisition module, and monitors the superheat of the exhaust gas during the operation of the air-conditioning system through the monitoring module, and the control module Controlling the timer to start timing when the exhaust superheat is less than the first preset value for the first preset time, and controlling the outdoor unit shutdown of the air conditioning system to prevent the compressor when the timing of the timer reaches the second preset time A liquid strike occurred. It can be seen that the liquid-repellent control device of the air-conditioning system according to the embodiment of the present invention performs liquid-protection protection by monitoring the exhaust superheat degree of the compressor in real time, thereby ensuring that the refrigerant returning to the compressor return port is purely gaseous. Prevent liquid refrigerant from entering the compressor and avoid liquid hammer from the compressor. Moreover, due to the large value of the superheat of the exhaust gas, it is convenient to perform data detection and liquid-proof control, improve the accuracy of liquid-proof control, and improve the safety and reliability of the operation of the air-conditioning system.

Figure 7 is a block schematic diagram of a liquid-repellent control device of an air conditioning system in accordance with another embodiment of the present invention. As shown in Figure 7 The liquid leakage control device includes: a first temperature sensor 70, a second temperature sensor 80, a third temperature sensor 90, an acquisition module 10 (ie, the calculation module 11 in the embodiment of FIG. 7), a monitoring module 20, and a control module. 30.

Wherein, as shown in FIG. 8, the first temperature sensor 70 is disposed at the exhaust port of the compressor 100, the first temperature sensor 70 is configured to detect the exhaust port temperature Tc of the compressor 100, and the second temperature sensor 80 is disposed at the evaporator. In the middle of 200, the second temperature sensor 80 is used to detect the central temperature T1 of the evaporator 200; the third temperature sensor 90 is disposed in the middle of the condenser 300, and the third temperature sensor 90 is used to detect the central temperature T2 of the condenser 300; the acquisition module 10 That is, the calculation module 11 is configured to calculate the exhaust superheat degree DSH of the compressor 100 according to the exhaust port temperature Tc and the central temperature T2 of the condenser 300 during the cooling operation of the air conditioning system, and according to the exhaust port temperature during the heating operation of the air conditioning system. Tc and the central temperature T1 of the evaporator 200 calculate the exhaust superheat DSH of the compressor 100; the monitoring module 20 is used to monitor the exhaust superheat DSH during the operation of the air conditioning system; the control module 30 is used for the superheat of the exhaust The control timer 60 starts counting when the DSH is less than the first preset value M1 and continues for the first preset time t1, and controls the outdoor unit of the air conditioning system when the time t of the timer 60 reaches the second preset time t2. Machine to prevent liquid hammer from occurring in the compressor.

According to a specific embodiment of the present invention, the first preset time t1 may be 20 minutes, the second preset time t2 may be 30 minutes, and the first preset value M1 may be A °C.

Specifically, during the operation of the air conditioning system, the first temperature sensor 70 detects the exhaust port temperature Tc of the compressor 100 in real time, and the second temperature sensor 80 detects the central temperature T1 of the condenser 300 in real time, and the third temperature sensor 90 is real-time. The central temperature T2 of the evaporator 200 is detected. When the air conditioning system is in cooling operation, the central temperature T1 of the condenser 300 corresponds to the saturation temperature of the high pressure side of the air conditioning system, that is, the central temperature T1 of the condenser 300 can be used as the exhaust saturation temperature. The exhaust superheat degree DSH of the compressor 100 can be approximated as the difference between the exhaust port temperature Tc of the compressor 100 and the central temperature T1 of the condenser 300 (Tc-T1); when the air conditioning system is heating, the evaporator The central temperature T2 of 200 corresponds to the saturation temperature of the high pressure side of the air conditioning system, that is, the central temperature T2 of the evaporator 200 can be used as the exhaust saturation temperature. At this time, the exhaust superheat degree DSH of the compressor 100 can be approximated as the compressor 100. The difference between the exhaust port temperature Tc and the central temperature T2 of the evaporator 200 (Tc-T2), and thus the real-time exhaust superheat DSH can be used for liquid-proof control.

Thus, when the air conditioning system is in cooling operation, the calculation module 11 calculates the exhaust superheat degree DSH of the compressor 100 according to the exhaust port temperature Tc of the compressor 100 and the central temperature T1 of the condenser 300; when the air conditioning system is heating, the calculation is performed. The module 11 calculates the exhaust superheat degree DSH of the compressor 100 based on the exhaust port temperature Tc of the compressor 100 and the central temperature T2 of the evaporator 200. Moreover, the monitoring module 20 monitors the exhaust superheat DSH during the operation of the air conditioning system, and determines whether the exhaust superheat DSH of the air conditioning system is greater than or equal to the first preset value M1, if the exhaust superheat DSH is greater than or equal to the first The preset value M1 (for example, A ° C) indicates that the return air superheat SSH of the air conditioning system is sufficiently large, and the control module 30 controls the outdoor unit of the air conditioning system to maintain normal operation. At this time, the refrigerant sucked into the air return port of the compressor 100 is If the exhaust superheat degree DSH is less than the first preset value M1, the control module 30 further determines whether the duration reaches the first preset time t1 (for example, 20 minutes), and if the duration reaches the first preset time t1, The control module 30 controls the timer 60 to open Start timing.

Further, the control module 30 determines whether the time t of the timer 60 reaches the second preset time t2 (for example, 30 minutes), and when the time t of the timer 60 reaches the second preset time t2, that is, exhausted When the duration of the heat DSH is less than the first preset value M1 reaches the second preset time t2, the return air superheat SSH of the corresponding air conditioning system is low, and the control module 30 controls the outdoor unit of the air conditioning system to stop to prevent the compressor 100 from being stopped. The return air inlet sucks in the liquid refrigerant to prevent the compressor 100 from being hit by liquid.

According to an embodiment of the present invention, during the timing of the timer 60, if the exhaust superheat DSH is greater than or equal to the first preset value M1 and continues for the third preset time t3, the control module 30 performs the timer 60. Cleared and continues to determine if the exhaust superheat DSH meets the conditions at which the timer 60 begins to count.

According to a specific embodiment of the invention, the third preset time t3 may be 5 minutes.

Specifically, during the timing of the timer 60, the monitoring module 20 monitors the exhaust superheat DSH in real time. If the exhaust superheat DSH is greater than or equal to the first preset value M1 (eg, A degrees Celsius), the control module 30 further Determining whether the duration reaches the third preset time t3 (for example, 5 minutes). If the exhaust superheat degree DSH is greater than or equal to the first preset value M1 (for example, A degrees Celsius) and continues for the third preset time t3, the control module 30 is The timer 60 performs a clearing and re-determines whether the exhaust superheat degree DSH satisfies the condition that the timer 60 starts counting.

According to an embodiment of the present invention, after the control of the outdoor unit is stopped, the control module 30 further determines whether the number N of the air-conditioning protection of the air-conditioning system during the fourth preset time t4 exceeds a preset time (for example, 2 times), wherein If the number N of the air-conditioning system performing the liquid-shielded protection protection exceeds the preset time (for example, 2 times) in the fourth preset time t4, the control module 30 controls the outdoor unit to be unable to resume the power-on in the case of non-power-off; if the fourth pre- It is assumed that the number N of air-proof protection of the air-conditioning system during the time t4 does not exceed a preset time (for example, 2 times), the control module 30 clears the timer 60, and controls the outdoor unit after the fifth preset time t5. start up.

According to a specific embodiment of the present invention, the fourth preset time t4 may be 120 minutes, and the fifth preset time t5 may be 6 minutes.

Specifically, the number of times the counter performs liquid-protection protection on the air-conditioning system (ie, the number of times the outdoor unit is controlled to stop) N is counted, and if the air-conditioning system performs the liquid-proof protection for the fourth preset time t4 (for example, 120 minutes) N exceeds the preset time (for example, 1 time), indicating that the air-conditioning system's return air superheat SSH is continuously low, and the control module 30 controls the outdoor unit to be unable to resume power-on in the case of non-power-off, that is, the outdoor unit needs to be first Powering off the power to restore the outdoor unit to power on. If the number N of air-proof protection of the air-conditioning system during the fourth preset time t4 (for example, 120 minutes) does not exceed a preset time (for example, 1 time), the control module 30 clears the timer 60 and is in the fifth. After the preset time t5 (for example, 6 minutes), the outdoor unit is automatically restarted, and it is re-determined whether the exhaust superheat DSH satisfies the condition that the timer 60 starts counting.

In summary, the liquid-proof control device for an air-conditioning system according to an embodiment of the present invention is detected by a first temperature sensor. The exhaust port temperature of the compressor, the second temperature sensor detects the middle temperature of the evaporator, the third temperature sensor detects the middle temperature of the condenser, and the calculation module calculates the temperature of the air conditioning system according to the exhaust port temperature and the central temperature of the condenser during the cooling operation of the air conditioning system. The exhaust superheat of the compressor, and calculating the exhaust superheat of the compressor according to the exhaust port temperature and the central temperature of the evaporator during the heating operation of the air conditioning system, and the monitoring module 20 exhausts the air during operation of the air conditioning system Superheat is monitored, and the control module controls the timer to start timing when the exhaust superheat is less than the first preset value and continues for the first preset time, and controls the air conditioning system when the timer time reaches the second preset time The outdoor unit is shut down to prevent liquid hammer from occurring in the compressor. It can be seen that the liquid-repellent control device of the air-conditioning system according to the embodiment of the present invention performs liquid-protection protection by monitoring the exhaust superheat degree of the compressor in real time, thereby ensuring that the refrigerant returning to the compressor is purely gaseous and preventing liquid state. The refrigerant enters the compressor to avoid liquid hammering of the compressor. Moreover, due to the large value of the superheat of the exhaust gas, the data detection and control are facilitated, the accuracy of the liquid-proof control is improved, and the safety and reliability of the operation of the air-conditioning system are improved.

9 is a block schematic diagram of an air conditioning system in accordance with an embodiment of the present invention. As shown in FIG. 9, the air conditioning system 400 includes a liquid pressure prevention control device 500 of an air conditioning system.

In summary, the air conditioning system according to the embodiment of the present invention monitors the exhaust superheat of the compressor in real time through the liquid-repellent control device of the air conditioner to perform liquid-proof protection, thereby ensuring return to the compressor return port. The refrigerant is purely gaseous, preventing liquid refrigerant from entering the compressor and avoiding liquid hammering of the compressor. Moreover, due to the large value of the superheat of the exhaust gas, it is convenient to perform data detection and liquid-proof control, improve the accuracy of liquid-proof control, and improve the safety and reliability of the operation of the air-conditioning system.

It should be noted that, in this context, relational terms such as first and second are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply such entities or operations. There is any such actual relationship or order between them. Furthermore, the term "comprises" or "comprises" or "comprises" or any other variations thereof is intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that comprises a plurality of elements includes not only those elements but also Other elements, or elements that are inherent to such a process, method, item, or device. An element that is defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in the process, method, item, or device that comprises the element.

The logic and/or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable instructions for implementing logical functions, and may be embodied in any computer readable medium, Used in conjunction with, or in conjunction with, an instruction execution system, apparatus, or device (eg, a computer-based system, a system including a processor, or other system that can fetch instructions and execute instructions from an instruction execution system, apparatus, or device) Or use with equipment. For the purposes of this specification, a "computer-readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport a program for use in an instruction execution system, apparatus, or device, or in conjunction with the instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer readable media include the following: electrical connections (electronic devices) having one or more wires, portable computer disk cartridges (magnetic devices), random access memory (RAM), Read only memory (ROM), erasable In addition to editable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read-only memory (CDROM). In addition, the computer readable medium may even be a paper or other suitable medium on which the program can be printed, as it may be optically scanned, for example by paper or other medium, followed by editing, interpretation or, if appropriate, other suitable The method is processed to obtain the program electronically and then stored in computer memory.

It should be understood that portions of the invention may be implemented in hardware, software, firmware or a combination thereof. In the above-described embodiments, multiple steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques well known in the art: having logic gates for implementing logic functions on data signals. Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements, unless otherwise specified Limited. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims (14)

1. A liquid-repellent control method for an air-conditioning system, comprising the steps of:

   Acquiring the superheat of the exhaust of the compressor in real time, and monitoring the superheat of the exhaust during operation of the air conditioning system;

   If the exhaust superheat is less than the first preset value and continues for the first preset time, the control timer starts counting;

   When the time counted by the timer reaches a second preset time, the outdoor unit of the air conditioning system is controlled to stop to prevent liquid hammer from occurring in the compressor.
2. The liquid-repellent control method for an air-conditioning system according to claim 1, wherein, in the process of counting the timer, if the superheat degree of the exhaust gas is greater than or equal to the first preset value and continues After three preset times, the timer is cleared, and it is continuously determined whether the exhaust superheat degree satisfies the condition that the timer starts counting.
3. The liquid-repellent control method for an air-conditioning system according to claim 1 or 2, wherein after the shutdown of the outdoor unit is controlled, it is further determined that the air-conditioning system performs the liquid-proof protection for the fourth preset time Whether it exceeds the preset time, among them,

   If the number of times the air-conditioning system performs liquid-protection protection exceeds a preset time in the fourth preset time, the outdoor unit is controlled to be unable to resume power-on in the case of non-power-off;

   If the number of times the air-conditioning system performs the liquid-proof protection for the fourth preset time does not exceed the preset time, the timer is cleared, and the outdoor unit is controlled to be restarted after the fifth preset time. start up.
4. The liquid-repellent control method for an air-conditioning system according to any one of claims 1 to 3, wherein the air-conditioning system includes a compressor, a condenser, and an evaporator, and the exhaust gas of the compressor is obtained in real time. Heat, including:

   Detecting a temperature of an exhaust port of the compressor, and detecting a central temperature of the condenser and a central temperature of the evaporator;

   Calculating an exhaust superheat of the compressor according to the exhaust port temperature and a central temperature of the condenser when the air conditioning system is in a cooling operation;

   When the air conditioning system is operating in heating, the exhaust superheat of the compressor is calculated based on the exhaust port temperature and a central temperature of the evaporator.
5. The liquid-repellent control method for an air-conditioning system according to any one of claims 1 to 3, wherein the real-time acquisition of exhaust superheat of the compressor includes:

   Detecting an exhaust port pressure of the compressor and detecting an exhaust port temperature of the compressor;

   The exhaust superheat of the compressor is calculated based on the exhaust port pressure and the exhaust port temperature.
6. The liquid-repellent control method for an air conditioning system according to claim 3, wherein the first preset time is 20 minutes, the second preset time is 30 minutes, and the third preset time is 5 minutes. The fourth preset time is For 120 minutes, the fifth preset time is 6 minutes.
7. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the program is executed by a processor to implement a liquid pressure control method of an air conditioning system according to any one of claims 1-6 .
8. A liquid-repellent control device for an air conditioning system, comprising:

   Obtaining a module for obtaining the exhaust superheat of the compressor in real time;

   a monitoring module, configured to monitor the superheat of the exhaust gas during operation of the air conditioning system;

   a control module, configured to control a timer to start timing when the exhaust superheat degree is less than a first preset value and last for a first preset time, and control the control unit when the timer time of the timer reaches a second preset time The outdoor unit of the air conditioning system is shut down to prevent liquid hammer from occurring in the compressor.
9. The liquid-repellent control device for an air-conditioning system according to claim 8, wherein, in the process of counting the timer, if the superheat degree of the exhaust gas is greater than or equal to the first preset value and continues For three preset times, the control module clears the timer and continues to determine whether the exhaust superheat meets the condition that the timer starts counting.
10. The anti-liquidation control device for an air conditioning system according to claim 8 or 9, wherein after controlling the shutdown of the outdoor unit, the control module further determines that the air conditioning system is liquid-proof for a fourth preset time Whether the number of times of protection has exceeded a preset number of times,

    If the number of times the air-conditioning system performs liquid-protection protection exceeds a preset time in the fourth preset time, the control module controls the outdoor unit to be unable to resume power-on in the case of non-power-off;

    If the number of times the air conditioning system performs the liquid-proof protection for the fourth preset time does not exceed the preset time, the control module clears the timer, and controls the station after the fifth preset time. The outdoor unit is restarted.
11. The liquid-repellent control device for an air-conditioning system according to any one of claims 8 to 10, wherein the air-conditioning system comprises a compressor, a condenser, and an evaporator, the device further comprising:

    a first temperature sensor disposed at an exhaust port of the compressor, the first temperature sensor being configured to detect an exhaust port temperature of the compressor;

    a second temperature sensor disposed in a middle portion of the evaporator, the second temperature sensor for detecting a central temperature of the evaporator;

    a third temperature sensor disposed in a middle portion of the condenser, the third temperature sensor for detecting a central temperature of the condenser;

    The obtaining module is further configured to calculate an exhaust superheat degree of the compressor according to the exhaust port temperature and a central temperature of the condenser during a cooling operation of the air conditioning system, and in the air conditioning system The thermal superheat of the compressor is calculated based on the exhaust port temperature and the central temperature of the evaporator during thermal operation.
12. A liquid-repellent control device for an air conditioning system according to any one of claims 8 to 10, characterized in that A fourth temperature sensor and a pressure sensor disposed at an exhaust port of the compressor, the fourth temperature sensor for detecting an exhaust port temperature of the compressor, the pressure sensor for detecting the compressor The exhaust port pressure, the acquisition module is configured to calculate the exhaust superheat of the compressor according to the exhaust port pressure and the exhaust port temperature.
13. The liquid-proof control device for an air conditioning system according to claim 10, wherein the first preset time is 20 minutes, the second preset time is 30 minutes, and the third preset time is 5 minutes. The fourth preset time is 120 minutes, and the fifth preset time is 6 minutes.
14. An air conditioning system comprising a liquid pressure prevention control device for an air conditioning system according to any one of claims 8-13.

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