A method and system for inhibiting warm shutdowns with a bypass loop

Abstract

The application provides a method and system for inhibiting warm shutdown by using a bypass circuit, and the method comprises the following steps: obtaining a room temperature and an exhaust temperature of a compressor; obtaining a current rotating speed of the compressor to obtain a first rotating speed; and controlling an opening degree of an expansion valve according to the room temperature, the exhaust temperature and the rotating speed. The application can inhibit the warm shutdown while ensuring the refrigerant circulation amount of the compressor even at low load. The indoor temperature change is reduced, and the comfort is prevented from decreasing.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, specifically, a kind of method and system for inhibiting to warm stop machine by bypass circuit. BACKGROUND

[0002] In air conditioner, air conditioner capacity is large when low load, sometimes exceed set temperature, stop air conditioner, make the temperature of recovery to warm stop machine control.But, to warm stop machine control needs to restart for temporarily stopping air conditioner, because for the output of certain capacity to restart, so that the temperature of room is unstable, reduce comfort.In particular in modern housing, heat insulation performance improves, air conditioner is operated under low load more often.Therefore, take the countermeasure of reducing the speed of compressor, reduce air conditioner capacity, reduce the frequency of entering to warm stop machine, if reducing the speed of compressor in small capacity air conditioner, therefore, sometimes the heat generated by the motor of compressor is not cooled completely.Result, the temperature of motor rises, sometimes can shorten the life of compressor. SUMMARY

[0003] Therefore, the embodiment of the present application provides a kind of method and system for inhibiting to warm stop machine by bypass circuit, even in low load, can ensure the refrigerant circulation amount of compressor while inhibiting to warm stop machine.Reduce indoor temperature variation, prevent comfort decline.

[0004] To solve the above problems, the present application provides a kind of method for inhibiting to warm stop machine by bypass circuit, comprising: bifurcating the exhaust pipe of compressor, and setting expansion valve on the branch; obtain room temperature and the exhaust temperature of compressor; obtain the current speed of compressor, to obtain first speed; according to room temperature, exhaust temperature and speed, control the opening of expansion valve.

[0005] Compared with prior art, the technical effects achieved by adopting the technical scheme are as follows: by setting the opening of expansion valve controlled according to room temperature and exhaust temperature and the speed of compressor, and by setting the branch of exhaust pipe of compressor, the flow of refrigerant in compressor can be controlled according to current environment, so that when room temperature is unstable and air conditioner is in low load state, the circulation of refrigerant can be more reasonable, the operating stability of air conditioner can be ensured, the temperature variation in room can be reduced, the situation that the exhaust temperature of compressor is too high can be avoided, and the use comfort of air conditioner is improved.

[0006] In one example of the present application, according to room temperature, exhaust temperature and speed to control expansion valve further comprises: obtaining the lowest speed at which the compressor can operate stably; comparing the lowest speed and the first speed to obtain a comparison result; according to the comparison result and room temperature and exhaust temperature, control the expansion valve.

[0007] Compared with the prior art, the technical effects achieved by the technical scheme are as follows: by acquiring the lowest running speed of the compressor, and then comparing the lowest speed with the current speed of the compressor, the expansion valve can be controlled when the compressor reaches the lowest running state, the flow of the refrigerant can be better controlled, the situation that the heat generated by the compressor motor cannot be completely cooled is avoided, the stable operation of the motor is ensured, the service life of the compressor is avoided from being shortened, and the safety of the air conditioner is improved.

[0008] In an example of the present application, controlling the expansion valve according to the comparison result and the room temperature and the exhaust temperature further comprises: when the first speed is greater than the lowest speed, the expansion valve is controlled to be fully closed; when the first speed is equal to the lowest speed, the mode of the current target air conditioner is acquired to obtain a target mode; and controlling the expansion valve according to the target mode, the room temperature and the exhaust temperature.

[0009] Compared with the prior art, the technical effects achieved by the technical scheme are as follows: by setting the expansion valve to be fully closed when the first speed is greater than the lowest speed, it is indicated that the current refrigerant circulation is normal and does not need to be controlled, and according to the mode of the air conditioner when the first speed is equal to the lowest speed, corresponding control is performed, so that the expansion valve is controlled according to different situations, the control of the expansion valve is more accurate and practical, and the control of the state of the compressor in the air conditioner is more reasonable and scientific, and the situation that affects the service life of the compressor is avoided.

[0010] In an example of the present application, controlling the expansion valve according to the target mode, the room temperature and the exhaust temperature further comprises: when the target mode is refrigeration, the current opening degree of the expansion valve is acquired and recorded as a first opening degree; the first room temperature change opening degree and the first exhaust change opening degree are acquired; and the opening degree of the expansion valve is controlled according to the first opening degree, the first room temperature change opening degree and the first exhaust change opening degree.

[0011] Compared with the prior art, the technical effects achieved by the technical scheme are as follows: by setting the opening degree control of the expansion valve through the first room temperature change opening degree and the first exhaust change opening degree when the mode is refrigeration, the opening degree control of the expansion valve is more practical, the room temperature and the exhaust temperature can better reflect the current use of the air conditioner, the air conditioner compressor can better control the current room temperature, the stability of the room temperature is ensured, the normal operation of the compressor is ensured, the situation of temperature stop is avoided, and the comfort of the air conditioner is improved.

[0012] In an example of the present application, the control of the expansion valve opening degree according to the first opening degree and the first room temperature changing opening degree and the first exhaust changing opening degree further comprises: setting the room temperature required to be reached in the cooling mode as a first target room temperature; obtaining the room temperature at time t as a first room temperature, and obtaining the room temperature at time t-1 as a second room temperature; then the first target temperature difference at time t = the first target room temperature - the first room temperature, and the second target temperature difference at time t-1 = the first target room temperature - the second room temperature; the first room temperature changing opening degree = Pa x (the first target temperature difference - the second target temperature difference) + Ia x the first target temperature difference; setting the exhaust temperature required to be reached in the cooling mode as a first target exhaust temperature; obtaining the exhaust temperature at time t as a first exhaust temperature, and obtaining the exhaust temperature at time t-1 as a second exhaust temperature; then the first target exhaust temperature difference at time t = the first target exhaust temperature - the first exhaust temperature, and the second target exhaust temperature difference at time t-1 = the first target exhaust temperature - the second exhaust temperature; the first exhaust changing opening degree = Pd x (the first target exhaust temperature difference - the second target exhaust temperature difference) + Id x the first target exhaust temperature difference; and then the expansion valve opening degree = the first opening degree + (α x the first room temperature changing opening degree + β x the first exhaust changing opening degree), wherein α, β, Pa, Ia, Pd, and Id > 0.

[0013] Compared with the prior art, the technical effects achieved by adopting the technical scheme are: by setting the difference between the room temperature and the target room temperature at two times to obtain the first room temperature changing opening degree, the first room temperature changing opening degree can better fit the actual use of the compressor at the moment, and then the subsequent adjustment of the expansion valve is more reasonable; meanwhile, the difference between the exhaust temperature and the target exhaust temperature at two times is obtained, and then the first exhaust changing opening degree is calculated, and then the exhaust temperature better reflects the actual operation of the air conditioner, so that the expansion valve can be better controlled according to the current situation, and finally the expansion valve opening degree is controlled in combination with the two changing opening degrees, so that the expansion valve opening degree control is more reasonable, the stable operation of the compressor is ensured, the compressor refrigerant circulation amount is ensured while the temperature stop is inhibited, the indoor temperature change is reduced, and the comfort is improved.

[0014] In an example of the present application, when the target mode is heating, the current opening degree of the expansion valve is obtained as a second opening degree; the second room temperature changing opening degree and the second exhaust changing opening degree are obtained; and the expansion valve opening degree is controlled according to the second opening degree and the second room temperature changing opening degree and the second exhaust changing opening degree.

[0015] Compared with the prior art, the technical effects achieved by adopting the technical scheme are: by setting different expansion valve opening degree controls when the target mode is heating, the control can be more in line with the actual situation in different modes and different situations, so that the compressor in the air conditioner runs more stably, and the room temperature is prevented from changing too fast to cause a decrease in use experience.

[0016] In one example of the present application, the control of the expansion valve opening degree according to the second opening degree and the second room temperature changing opening degree and the second exhaust changing opening degree further comprises: setting the room temperature required to be reached in the heating mode as a second target room temperature; obtaining the room temperature at time t as a third room temperature, and obtaining the room temperature at time t-1 as a fourth room temperature; then the third target temperature difference at time t = the third room temperature - the second target room temperature, and the fourth target temperature difference at time t-1 = the fourth room temperature - the second target room temperature; the second room temperature changing opening degree = Pa x (the third target temperature difference - the fourth target temperature difference) + Ia x the third target temperature difference; setting the exhaust temperature required to be reached in the heating mode as a second target exhaust temperature; obtaining the exhaust temperature at time t as a third exhaust temperature, and obtaining the exhaust temperature at time t-1 as a fourth exhaust temperature; then the third target exhaust temperature difference at time t = the second target exhaust temperature - the third exhaust temperature, and the fourth target exhaust temperature difference at time t-1 = the second target exhaust temperature - the fourth exhaust temperature; the second exhaust changing opening degree = Pd x (the third target exhaust temperature difference - the fourth target exhaust temperature difference) + Id x the third target exhaust temperature difference; and then the expansion valve opening degree = the first opening degree + (α x the second room temperature changing opening degree + β x the second exhaust changing opening degree), wherein α, β, Pa, Ia, Pd, Id > 0.

[0017] Compared with the prior art, the technical effects achieved by adopting the technical scheme are: by setting the difference between the room temperature and the target room temperature at two times, and then calculating the second room temperature changing opening degree, the compressor refrigerant flow control in the heating mode is more reasonable, and the stability of the room temperature in the heating mode can be better guaranteed; by setting the exhaust temperature difference at two times, and then calculating the second exhaust changing opening degree, the expansion valve opening degree is calculated, the air conditioner running stability in the heating mode is guaranteed, the compressor running stability is improved, and the temperature stop machine can be better inhibited.

[0018] The present application also provides a system for inhibiting the temperature stop machine by using a bypass circuit, which is suitable for the method of any one of the above, and the system comprises: a compressor; a four-way valve connected to the compressor and a first heat exchanger, and the first heat exchanger is also connected to a second heat exchanger; the second heat exchanger is connected to the compressor through the four-way valve; and a bypass circuit arranged between the compressor and the second heat exchanger, and used for controlling the refrigerant flow.

[0019] Compared with the prior art, the technical effects achieved by adopting the technical scheme are: by adding a bypass circuit in the system circuit formed by the compressor, the four-way valve and the two heat exchangers, so that the refrigerant discharged from the compressor flows to the indoor unit through the outdoor heat exchanger to form two flows returning to the compressor and flowing through the bypass circuit, and thus the temperature stop machine can be inhibited while ensuring the compressor refrigerant circulation amount even at low load, and the indoor temperature change is reduced to prevent the comfort level from decreasing.

[0020] In one example of the present application, the first end of the bypass circuit is arranged between the compressor and the four-way valve, and the second end is arranged between the second heat exchanger and the compressor, the bypass circuit comprising: a capillary tube arranged close to the first end, and a valve body arranged close to the second end.

[0021] Compared with the prior art, the technical effects achieved by adopting the technical scheme are: by arranging the capillary tube and the valve body in the bypass circuit, and arranging the valve body close to the second end, the valve body can better control the refrigerant flow in the shunt, thereby better ensuring the normal operation of the compressor.

[0022] In one example of the present application, the valve body can be an expansion valve or an electromagnetic valve.

[0023] Compared with the prior art, the technical effects achieved by adopting the technical scheme are: by arranging the valve body to have two options, the selection range is larger, and different valve bodies can be selected to adapt to different situations, so that the practicality is stronger.

[0024] After adopting the technical scheme of the present application, the following technical effects can be achieved:

[0025] (1) By arranging the opening degree of the expansion valve to be controlled according to the room temperature and the discharge temperature and the compressor speed, and arranging the discharge pipe of the compressor to be branched, the refrigerant flow in the compressor can be controlled according to the current environment, thereby making the refrigerant circulation more reasonable when the room temperature is unstable and the air conditioner is in a low load state, and also ensuring the operation stability of the air conditioner, reducing the temperature change in the room, avoiding the case that the discharge temperature of the compressor becomes high, and improving the use comfort of the air conditioner.

[0026] (2) By adding a bypass circuit in the system circuit formed by the compressor, the four-way valve and the two heat exchangers, the refrigerant discharged from the compressor flows to the indoor unit through the outdoor heat exchanger to form two flows returning to the compressor and flowing through the bypass circuit, thereby ensuring that even in a low load state, the compressor refrigerant circulation amount can be ensured while the temperature stop is inhibited, the indoor temperature change is reduced, and the comfort is prevented from decreasing. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0028] Figure 1A flowchart of a method for inhibiting warm shutdown by using a bypass circuit is provided. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application are described clearly and completely. Obviously, the described embodiments are only some of the embodiments of the present application, but not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0030] [First embodiment]

[0031] Referring to Figure 1 The present application provides a method for inhibiting warm shutdown by using a bypass circuit, a bypass is arranged in the exhaust pipe of a compressor, and the method comprises the following steps.

[0032] Step S100: obtaining the room temperature and the exhaust temperature of the compressor;

[0033] Step S200: obtaining the current rotating speed of the compressor to obtain a first rotating speed;

[0034] Step S300: controlling the opening degree of the expansion valve according to the room temperature, the exhaust temperature and the rotating speed.

[0035] Specifically, the bypass circuit is composed of a circuit in which a capillary tube and an expansion valve are connected in series. Because in a small-capacity air conditioner (with a rated cooling capacity of less than 7 kW), the amount of refrigerant flowing in the bypass circuit is small, the flow control can not be performed only by the expansion valve. Therefore, the capillary tube is connected in series to reduce the pressure difference before and after the expansion valve, so that the control can be performed even in the case of low flow.

[0036] Preferably, the opening degree of the expansion valve is controlled according to the room temperature, the exhaust temperature and the rotating speed of the compressor, and the bypass is arranged in the exhaust pipe of the compressor, so that the flow of the refrigerant in the compressor can be controlled according to the current environment, and the circulation of the refrigerant can be more reasonable when the room temperature is unstable and the air conditioner is in a low-load state, and the operation stability of the air conditioner can be ensured, the temperature change in the room can be reduced, the exhaust temperature of the compressor can be prevented from being too high, and the use comfort of the air conditioner is improved.

[0037] Specifically, the control of the expansion valve according to the room temperature, the exhaust temperature and the rotating speed further comprises the following steps: obtaining the minimum rotating speed at which the compressor can operate stably; comparing the minimum rotating speed with the first rotating speed to obtain a comparison result; and controlling the expansion valve according to the comparison result, the room temperature and the exhaust temperature.

[0038] Preferably, by acquiring the minimum running speed of the compressor, and then by comparing the minimum speed and the current speed of the compressor, the expansion valve can be controlled when the compressor reaches the minimum running state, thereby better controlling the flow of refrigerant, while avoiding the situation that the heat generated by the compressor motor cannot be completely cooled, ensuring the stable operation of the motor, thereby avoiding shortening the service life of the compressor, and also improving the safety of the air conditioner.

[0039] Specifically, according to the comparison result, the room temperature and the exhaust temperature, the expansion valve is controlled as follows: when the first speed is greater than the minimum speed, the expansion valve is controlled to be fully closed; when the first speed is equal to the minimum speed, the mode of the current target air conditioner is acquired to obtain a target mode; and the expansion valve is controlled according to the target mode, the room temperature and the exhaust temperature.

[0040] Preferably, by setting the expansion valve to be fully closed when the first speed is greater than the minimum speed, it indicates that the current refrigerant circulation is normal and does not need to be controlled, and by controlling according to the mode of the air conditioner when the first speed is equal to the minimum speed, the expansion valve is controlled according to different situations, so that the control of the expansion valve is more accurate and practical, and the control of the state of the compressor in the air conditioner is more reasonable and scientific, thereby avoiding the situation that affects the service life of the compressor.

[0041] Specifically, according to the target mode, the room temperature and the exhaust temperature, the expansion valve is controlled as follows: when the target mode is cooling, the current opening degree of the expansion valve is acquired and recorded as a first opening degree; the first room temperature change opening degree and the first exhaust change opening degree are acquired; and the opening degree of the expansion valve is controlled according to the first opening degree, the first room temperature change opening degree and the first exhaust change opening degree.

[0042] Preferably, by setting the first room temperature change opening degree and the first exhaust change opening degree to control the opening degree of the expansion valve when in the cooling mode, the opening degree control of the expansion valve is more practical, and the room temperature and the exhaust temperature can better reflect the current use of the air conditioner, so that the air conditioner compressor can better control the current room temperature, thereby ensuring the stability of the room temperature and the normal operation of the compressor, avoiding the situation of temperature stop, and thereby improving the comfort of the air conditioner.

[0043] Specifically, the control of the expansion valve opening degree according to the first opening degree and the first room temperature changing opening degree and the first exhaust changing opening degree further comprises: setting the room temperature required to be reached in the cooling mode as a first target room temperature; obtaining the room temperature at time t as a first room temperature, and obtaining the room temperature at time t-1 as a second room temperature; then the first target temperature difference at time t = the first target room temperature - the first room temperature, and the second target temperature difference at time t-1 = the first target room temperature - the second room temperature; the first room temperature changing opening degree = Pa x (the first target temperature difference - the second target temperature difference) + Ia x the first target temperature difference; setting the exhaust temperature required to be reached in the cooling mode as a first target exhaust temperature; obtaining the exhaust temperature at time t as a first exhaust temperature, and obtaining the exhaust temperature at time t-1 as a second exhaust temperature; then the first target exhaust temperature difference at time t = the first target exhaust temperature - the first exhaust temperature, and the second target exhaust temperature difference at time t-1 = the first target exhaust temperature - the second exhaust temperature; the first exhaust changing opening degree = Pd x (the first target exhaust temperature difference - the second target exhaust temperature difference) + Id x the first target exhaust temperature difference; and then the expansion valve opening degree = the first opening degree + (α x the first room temperature changing opening degree + β x the first exhaust changing opening degree), wherein α, β, Pa, Ia > 0.

[0044] Specifically, Pa, Ia, Pd, and Id are constant values determined by experiments, and α and β are function values of exhaust superheat.

[0045] Preferably, the difference between the room temperature and the target room temperature at two times is obtained to obtain the first room temperature changing opening degree, which can better adapt to the actual use of the compressor at the moment, and thus the subsequent adjustment of the expansion valve is more reasonable. Meanwhile, the difference between the exhaust temperature and the target exhaust temperature at two times is obtained to obtain the first exhaust changing opening degree, which can better reflect the actual operation of the air conditioner at the moment, and thus the subsequent control of the expansion valve can be better targeted at the current situation. Finally, the two changing opening degrees are combined to control the expansion valve opening degree, so that the control of the expansion valve opening degree is more reasonable, the stable operation of the compressor is ensured, the refrigerant circulation amount of the compressor is ensured, the temperature stop is inhibited, the temperature change in the room is reduced, and the comfort is improved.

[0046] Specifically, when the target mode is heating, the current opening degree of the expansion valve is obtained as a second opening degree; the second room temperature changing opening degree and the second exhaust changing opening degree are obtained; and the expansion valve opening degree is controlled according to the second opening degree and the second room temperature changing opening degree and the second exhaust changing opening degree.

[0047] Preferably, different expansion valve opening degree controls are performed when the target mode is heating, so that more practical controls can be performed under different modes and different situations, and the compressor in the air conditioner can operate more stably, and the room temperature can not change too fast to reduce the use experience.

[0048] Specifically, the control of the expansion valve opening degree according to the second opening degree and the second room temperature changing opening degree and the second exhaust changing opening degree further comprises: setting the room temperature required to be reached in the heating mode as a second target room temperature; obtaining the room temperature at time t as a third room temperature, and obtaining the room temperature at time t-1 as a fourth room temperature; then the third target temperature difference at time t = the third room temperature - the second target room temperature, and the fourth target temperature difference at time t-1 = the fourth room temperature - the second target room temperature; the second room temperature changing opening degree = Pa × (the third target temperature difference - the fourth target temperature difference) + Ia × the third target temperature difference; setting the exhaust temperature required to be reached in the heating mode as a second target exhaust temperature; obtaining the exhaust temperature at time t as a third exhaust temperature, and obtaining the exhaust temperature at time t-1 as a fourth exhaust temperature; then the third target exhaust temperature difference at time t = the second target exhaust temperature - the third exhaust temperature, and the fourth target exhaust temperature difference at time t-1 = the second target exhaust temperature - the fourth exhaust temperature; the second exhaust changing opening degree = Pd × (the third target exhaust temperature difference - the fourth target exhaust temperature difference) + Id × the third target exhaust temperature difference; and then the expansion valve opening degree = the first opening degree + (α × the second room temperature changing opening degree + β × the second exhaust changing opening degree), wherein α, β, Pa, Ia > 0.

[0049] Preferably, by setting the difference between the room temperature and the target room temperature at two times, the second room temperature changing opening degree is calculated, so that the compressor refrigerant flow control in the heating mode is more reasonable, and the stability of the room temperature in the heating mode can be better guaranteed. At the same time, by setting the exhaust temperature difference at two times, the second exhaust changing opening degree is calculated, so as to calculate and control the expansion valve opening degree, thereby guaranteeing the stability of the air conditioner in the heating mode, improving the operation stability of the compressor, and further better inhibiting the temperature stop.

[0050] Preferably, when the expansion valve is changed to an electromagnetic valve, the electromagnetic valve is opened when the frequency of entering the temperature stop is more than 1 time per 15 minutes. However, the electromagnetic valve is closed when the exhaust temperature exceeds 105℃.

[0051] The application also provides a system for inhibiting temperature stop by using a bypass circuit, which is suitable for the method of any one of the above, and the system comprises: a compressor; a four-way valve connected to the compressor and a first heat exchanger, and the first heat exchanger is further connected to a second heat exchanger; the second heat exchanger is connected to the compressor through the four-way valve; a bypass circuit is arranged between the compressor and the second heat exchanger, and the bypass circuit is used to control the refrigerant flow.

[0052] The preferred air conditioner has the structure of a bypass circuit with a divergent compressor discharge pipe, one branch of which is connected to a four-way valve, and the other branch is connected to a capillary tube and an expansion valve returning to the compressor suction; another example is characterized by connecting the outlet pipe of the bypass circuit between the four-way valve and a service valve (gas side); another example is characterized by connecting the inlet pipe of the bypass circuit between the four-way valve and a heat exchanger; another example is characterized by connecting the inlet pipe of the bypass circuit between the four-way valve and a heat exchanger, and connecting the outlet pipe between the four-way valve and a service valve (gas side).

[0053] The preferred air conditioner is characterized by the structure of the expansion valve and the capillary tube on the upstream side of the bypass circuit; another example is characterized by the structure of the capillary tube, the expansion valve, and the capillary tube on the upstream side of the bypass circuit.

[0054] The preferred air conditioner is characterized by adding a bypass circuit to the system circuit formed by the compressor, the four-way valve, and the two heat exchangers, so that the refrigerant discharged from the compressor flows to the indoor unit through the outdoor heat exchanger through the bypass circuit, forming two flows returning to the compressor and flowing through the bypass circuit, thereby ensuring that even at low load, the compressor refrigerant circulation amount is ensured while the temperature stop is inhibited. Reducing indoor temperature changes and preventing comfort decline.

[0055] Specifically, the first end of the bypass circuit is located between the compressor and the four-way valve, and the second end is located between the second heat exchanger and the compressor. The bypass circuit includes a capillary tube and a valve body, the capillary tube is located near the first end, and the valve body is located near the second end.

[0056] The preferred air conditioner is characterized by setting the capillary tube and the valve body in the bypass circuit, and the valve body is located near the second end, so that the valve body can better control the flow of refrigerant in the bypass circuit, thereby better ensuring the normal operation of the compressor.

[0057] Specifically, the valve body can be an expansion valve or an electromagnetic valve.

[0058] The preferred air conditioner is characterized by setting the valve body to have two options, so that the selection range is larger, and can adapt to different situations to select different valve bodies, so that the practicality is stronger.

[0059] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of suppressing warm shutdown by applying a bypass circuit, branching an exhaust pipe of a compressor, and providing an expansion valve in the branch, characterized in that, The method comprises: acquiring a room temperature and an exhaust temperature of the compressor; acquiring a current rotating speed of the compressor to obtain a first rotating speed; controlling an opening degree of the expansion valve according to the room temperature, the exhaust temperature and the rotating speed; acquiring a minimum rotating speed at which the compressor can operate stably; comparing the minimum rotating speed with the first rotating speed to obtain a comparison result; controlling the expansion valve according to the comparison result, the room temperature and the exhaust temperature; when the first rotating speed is greater than the minimum rotating speed, controlling the expansion valve to be fully closed; when the first rotating speed is equal to the minimum rotating speed, acquiring a current target mode of the air conditioner to obtain a target mode; controlling the expansion valve according to the target mode, the room temperature and the exhaust temperature.

2. The method of inhibiting a warm shutdown with a bypass loop according to claim 1, wherein, The controlling the expansion valve according to the target mode, the room temperature and the exhaust temperature further comprises: when the target mode is cooling; acquiring a current opening degree of the expansion valve and recording the current opening degree as a first opening degree; acquiring a first room temperature changing opening degree and a first exhaust temperature changing opening degree; controlling the opening degree of the expansion valve according to the first opening degree, the first room temperature changing opening degree and the first exhaust temperature changing opening degree.

3. The method of inhibiting a warm shutdown with a bypass loop according to claim 2, wherein, The controlling the opening degree of the expansion valve according to the first opening degree, the first room temperature changing opening degree and the first exhaust temperature changing opening degree further comprises: setting a room temperature required to be reached in the cooling mode as a first target room temperature; acquiring a room temperature at time t and recording the room temperature at time t as a first room temperature, and acquiring a room temperature at time t-1 and recording the room temperature at time t-1 as a second room temperature; a first target temperature difference at the time t = the first target room temperature - the first room temperature, and a second target temperature difference at the time t-1 = the first target room temperature - the second room temperature; the first room temperature changing opening degree = Pa×(the first target temperature difference - the second target temperature difference) + Ia×the first target temperature difference; setting an exhaust temperature required to be reached in the cooling mode as a first target exhaust temperature; acquiring an exhaust temperature at the time t and recording the exhaust temperature at the time t as a first exhaust temperature, and acquiring an exhaust temperature at the time t-1 and recording the exhaust temperature at the time t-1 as a second exhaust temperature; a first target exhaust temperature difference at the time t = the first target exhaust temperature - the first exhaust temperature, and a second target exhaust temperature difference at the time t-1 = the first target exhaust temperature - the second exhaust temperature; the first exhaust temperature changing opening degree = Pd×(the first target exhaust temperature difference - the second target exhaust temperature difference) + Id×the first target exhaust temperature difference; the opening degree of the expansion valve = the first opening degree + (α×the first room temperature changing opening degree + β×the first exhaust temperature changing opening degree), wherein α, β, Pa, Ia, Pd and Id are greater than 0.

4. The method according to claim 2, wherein, when the target mode is heating; acquiring a current opening degree of the expansion valve and recording the current opening degree as a second opening degree; acquiring a second room temperature changing opening degree and a second exhaust temperature changing opening degree; controlling the opening degree of the expansion valve according to the second opening degree, the second room temperature changing opening degree and the second exhaust temperature changing opening degree.

5. The method of inhibiting a warm shutdown with a bypass loop according to claim 4, wherein, The controlling the opening degree of the expansion valve according to the second opening degree, the second room temperature changing opening degree and the second exhaust temperature changing opening degree further comprises: The room temperature to be reached in the heating mode is set as a second target room temperature; The room temperature at time t is obtained and recorded as a third room temperature, and the room temperature at time t-1 is obtained and recorded as a fourth room temperature; The third target temperature difference at time t is equal to the third room temperature minus the second target room temperature, and the fourth target temperature difference at time t-1 is equal to the fourth room temperature minus the second target room temperature; The second room temperature change opening degree is equal to Pa multiplied by (the third target temperature difference minus the fourth target temperature difference) plus Ia multiplied by the third target temperature difference; The exhaust gas temperature to be reached in the heating mode is set as a second target exhaust gas temperature; The exhaust gas temperature at time t is obtained and recorded as a third exhaust gas temperature, and the exhaust gas temperature at time t-1 is obtained and recorded as a fourth exhaust gas temperature; The third target exhaust gas temperature difference at time t is equal to the second target exhaust gas temperature minus the third exhaust gas temperature, and the fourth target exhaust gas temperature difference at time t-1 is equal to the second target exhaust gas temperature minus the fourth exhaust gas temperature; The second exhaust gas change opening degree is equal to Pd multiplied by (the third target exhaust gas temperature difference minus the fourth target exhaust gas temperature) plus Id multiplied by the third target exhaust gas temperature difference; The expansion valve opening degree is equal to the first opening degree plus (α multiplied by the second room temperature change opening degree plus β multiplied by the second exhaust gas change opening degree), where α, β, Pa, Ia, Pd, and Id are greater than 0.

6. A system for inhibiting warm shutdowns with a bypass loop, said system being adapted to the method according to any one of claims 1 to 5, characterized in that The system comprises: a compressor; a four-way valve connected to the compressor and a first heat exchanger, and the first heat exchanger is further connected to a second heat exchanger; the second heat exchanger is connected to the compressor through the four-way valve; a bypass circuit provided between the compressor and the second heat exchanger, and the bypass circuit is used to control the refrigerant flow.

7. The system of claim 6, wherein the bypass circuit comprises: a first end of the bypass circuit is provided between the compressor and the four-way valve, and a second end of the bypass circuit is provided between the second heat exchanger and the compressor, and the bypass circuit comprises a capillary tube provided close to the first end and a valve body provided close to the second end.

8. The system of claim 7 for inhibiting a warm shutdown with a bypass loop, wherein, The system further comprises: The valve body can be an expansion valve or an electromagnetic valve.

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