Reversible air supply air conditioner and control method thereof

Abstract

The application relates to a reversible air supply air conditioner and a control method thereof, and relates to the technical field of air conditioners, and aims to solve the problem of reduced heat exchange efficiency and heat exchange effect of an indoor heat exchanger caused by reverse air outlet. The reversible air supply air conditioner comprises an indoor unit and a liquid path switcher. The indoor unit comprises a machine shell, an indoor heat exchanger and a fan, the machine shell is provided with a first air outlet and a second air outlet, the first air outlet is arranged downward, and the second air outlet is located on the side wall of the machine shell. The fan and the indoor heat exchanger are arranged in the machine shell. The indoor heat exchanger comprises a first flow collector, a second flow collector and a heat exchange pipeline, two ends of the heat exchange pipeline are connected with the first flow collector and the second flow collector. The fan is configured to drive air to blow out from the first air outlet in a heating mode and to drive air to blow out from the second air outlet in a cooling mode. The liquid path switcher is connected with the first flow collector and the second flow collector, and the liquid path switcher is configured to adjust the flow direction of refrigerant in the heat exchange pipeline.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and in particular to a reversible air supply air conditioner and a control method thereof. BACKGROUND

[0002] A fan coil is a commonly used indoor unit of an air conditioner, and is widely used in hotels, residences, offices and other occasions due to its concealed installation effect. However, due to the different densities of cold air and hot air, the cold air will sink and the hot air will float, thereby affecting the comfort of the human body.

[0003] The reversible air supply fan coil can switch the air outlet direction to solve the problems of cold air sinking and hot air floating. Based on this, for the indoor heat exchanger, if the refrigerant inside the indoor heat exchanger is in a counter-flow heat exchange state in the refrigeration mode, but in the heating mode, the air flow direction changes through the indoor heat exchanger, thereby causing the refrigerant in the indoor heat exchanger to be in a non-counter-flow heat exchange state, which reduces the heat exchange efficiency and the heating effect in the heating mode. SUMMARY

[0004] The present application provides a reversible air supply air conditioner and a control method thereof, aiming to solve the problem of reduced heat exchange efficiency and heat exchange effect of the indoor heat exchanger due to reverse air outlet.

[0005] In a first aspect, the embodiments of the present application provide a reversible air supply air conditioner, comprising an indoor unit and a liquid path switcher. The indoor unit comprises a casing, an indoor heat exchanger and a fan. The casing is provided with a first air outlet and a second air outlet, the first air outlet is arranged downwardly, and the second air outlet is located on the side wall of the casing. The fan and the indoor heat exchanger are arranged in the casing. The indoor heat exchanger comprises a first flow collector, a second flow collector and a heat exchange pipeline, both ends of the heat exchange pipeline are connected with the first flow collector and the second flow collector. The fan is configured to drive air to blow out from the first air outlet in the heating mode and to drive air to blow out from the second air outlet in the refrigeration mode. The liquid path switcher is connected with the first flow collector and the second flow collector, and is configured to adjust the flow direction of the refrigerant in the heat exchange pipeline.

[0006] In some embodiments, the liquid path switcher comprises an inlet end, an outlet end, a first switching circuit, a second switching circuit, a third switching circuit and a fourth switching circuit. The inlet end is connected with one end of the first switching circuit and the second switching circuit, the other end of the first switching circuit is connected with the first flow collector, and the other end of the second switching circuit is connected with the second flow collector. One end of the third switching circuit is connected with the first flow collector, one end of the fourth switching circuit is connected with the second flow collector, and the other ends of the third switching circuit and the fourth switching circuit are connected with the outlet end.

[0007] The liquid path switcher is configured to:

[0008] In the heating mode, the first switching circuit and the fourth switching circuit are turned on to make the refrigerant flow through the first header, the heat exchange pipeline and the second header in sequence.

[0009] In the cooling mode, the second switching circuit and the third switching circuit are turned on to make the refrigerant flow through the second header, the heat exchange pipeline and the first header in sequence.

[0010] In some embodiments, switching valves are provided in the first switching circuit, the second switching circuit, the third switching circuit and the fourth switching circuit. In the heating mode, the switching valves in the first switching circuit and the fourth switching circuit are opened, and the switching valves in the second switching circuit and the third switching circuit are closed. In the cooling mode, the switching valves in the second switching circuit and the third switching circuit are opened, and the switching valves in the first switching circuit and the fourth switching circuit are closed.

[0011] In some embodiments, circulating pumps are provided in the first switching circuit, the second switching circuit, the third switching circuit and the fourth switching circuit. In the heating mode, the circulating pumps in the first switching circuit and the fourth switching circuit are started to drive the refrigerant to flow from the first switching circuit into the indoor heat exchanger. In the cooling mode, the circulating pumps in the second switching circuit and the third switching circuit are started to drive the refrigerant to flow from the second switching circuit into the indoor heat exchanger.

[0012] In some embodiments, the inflow end, the first switching circuit and the second switching circuit form a two-position three-way valve, and the outflow end, the third switching circuit and the fourth switching circuit form a two-position three-way valve. In the heating mode, the inflow end is connected to the first switching circuit, and the third switching circuit is connected to the outflow end. In the cooling mode, the inflow end is connected to the second switching circuit, and the fourth switching circuit is connected to the outflow end.

[0013] In some embodiments, the fan is a centrifugal fan and is configured to have a first air supply state and a second air supply state which can be switched. In the first air supply state, the volute of the fan is rotated to a position where the air outlet faces the first air port. In the second air supply state, the volute of the fan is rotated to a position where the air outlet faces the second air port.

[0014] In some embodiments, in the heating mode and the cooling mode, the refrigerant in the heat exchange pipeline is in a counter-flow heat exchange state.

[0015] In some embodiments, in the heating mode, the overall flow direction of the refrigerant in the heat exchange pipeline is from top to bottom.

[0016] In some embodiments, the reversible air supply air conditioner comprises a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, a flow sensor, and a control module. The first temperature sensor is arranged at the first air outlet, and the second temperature sensor is arranged at the second air outlet. The third temperature sensor is arranged at the inlet end for detecting the inflow temperature of the refrigerant. The fourth temperature sensor is arranged at the outlet end for detecting the outflow temperature of the refrigerant. The flow sensor is arranged at the first or second flow collector for detecting the flow of the refrigerant. The control module is electrically connected with the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, the flow sensor, and the fan.

[0017] In a second aspect, the present application provides a control method of a reversible air supply air conditioner, which is applied to the reversible air supply air conditioner in the first aspect. The control method comprises:

[0018] The starting step: obtaining the first running parameters of the air conditioner. The first running parameters include the running mode, the fan gear, the set temperature, the return air temperature, and the inflow temperature of the refrigerant.

[0019] The first switching step: judging whether the return air temperature matches the running mode. If yes, controlling the fan to switch to the air outlet direction corresponding to the running mode.

[0020] The second switching step: judging whether the inflow temperature of the refrigerant matches the running mode. If yes, controlling the liquid path switcher to adjust the flow direction of the refrigerant in the heat exchange pipe.

[0021] In some embodiments, in the first switching step, the return air temperature in the heating mode is less than the set temperature, and the return air temperature in the cooling mode is greater than the set temperature. In the second switching step, the inflow temperature in the heating mode is greater than the set temperature, and the inflow temperature in the cooling mode is less than the set temperature.

[0022] In some embodiments, after the first switching step and the second switching step, the control method comprises:

[0023] The collecting step: after running for a first preset time, obtaining the first detected flow of the refrigerant in the indoor heat exchanger.

[0024] The judging step: calculating the target flow of the refrigerant according to the first running parameters, and comparing the first detected flow with the target flow.

[0025] If the ratio of the first detected flow to the target flow is greater than or equal to a first threshold value, the current running state is maintained.

[0026] In some embodiments, in the judging step, if the ratio of the first detected flow to the target flow is between a second threshold value and the first threshold value, the control method comprises:

[0027] The control fan performs mechanical reset on the air outlet direction of the fan according to the current operation mode. The second threshold is smaller than the first threshold.

[0028] Return to perform the collecting step.

[0029] If the ratio of the first detection flow rate to the target flow rate is still between the second threshold and the first threshold after the secondary detection.

[0030] Adjust the fan gear to the silent gear and prompt the fault.

[0031] In some embodiments, in the judging step, if the ratio of the first detection flow rate to the target flow rate is between the third threshold and the second threshold, the control method comprises:

[0032] Control the liquid path switcher to switch the flow direction of the refrigerant in the heat exchange pipe. The third threshold, the second threshold and the first threshold increase in turn.

[0033] After running for the second preset time, obtain a second detection flow rate of the refrigerant in the indoor heat exchanger.

[0034] Compare the second detection flow rate with the target flow rate.

[0035] If the ratio of the second detection flow rate to the target flow rate is greater than or equal to the first threshold, adjust the air outlet direction of the fan and the liquid path switcher reversely according to the current operation state, and update the air supply state information of the fan.

[0036] If the ratio of the second detection flow rate to the target flow rate is between the second threshold and the first threshold, control the liquid path switcher to reset, control the fan to perform mechanical reset on the air outlet direction of the fan according to the current operation mode, and return to perform the collecting step.

[0037] If the ratio of the second detection flow rate to the target flow rate is still between the third threshold and the second threshold, control the air conditioner to stop and prompt the fault.

[0038] In some embodiments, the control method comprises:

[0039] If the ratio of the first detection flow rate to the target flow rate is less than the third threshold, control the air conditioner to stop and prompt the fault.

[0040] In some embodiments, the first threshold is 95%, the second threshold is 90%, and the third threshold is 80%.

[0041] Compared with the prior art, the above technical solutions provided by the embodiments of the present application have the following advantages:

[0042] The liquid path switcher is connected with the first and second flow collectors, so that the refrigerant (such as phase-change refrigerant or water) can flow into the indoor heat exchanger through the liquid path switcher. Since the liquid path switcher can adjust the flow direction of the refrigerant flowing into the indoor heat exchanger, in the heating mode, the refrigerant flows through the first flow collector, the heat exchange pipeline and the second flow collector in sequence through the liquid path switcher. In the cooling mode, the state of the liquid path switcher is adjusted, so that the refrigerant can flow through the second flow collector, the heat exchange pipeline and the first flow collector in sequence in the indoor heat exchanger.

[0043] In the heating mode, the fan is in the first air supply state, and the air outlet is arranged to face the first air outlet, so as to drive air to flow into the second air outlet and blow out from the first air outlet after flowing through the indoor heat exchanger. In the cooling mode, the fan is in the second air supply state, and the air outlet is arranged to face the second air outlet, so as to drive air to flow into the first air outlet and blow out from the second air outlet after flowing through the indoor heat exchanger. That is, through the configuration of the fan and the liquid path switcher, hot air can be blown out from the first air outlet in the heating mode, and cold air can be blown out from the second air outlet in the cooling mode, and the refrigerant flowing through the heat exchange pipeline has different flow directions in the heating mode and the cooling mode to be in the counter-flow heat exchange state. Therefore, the indoor unit and the indoor heat exchanger have high heat exchange efficiency and heat exchange effect in the cooling mode and the heating mode, avoiding the problem of reduced heat exchange efficiency and heat exchange effect of the indoor heat exchanger due to the change of air flow direction, thereby further improving the comprehensive heat exchange efficiency of the energy-saving air conditioner in the cooling mode and the heating mode, and having high energy efficiency ratio. Moreover, the indoor unit also takes into account the horizontal diffusion of cold air and the formation of a waterfall-type cooling effect, and the natural upward flow of hot air and the formation of a carpet-type heating effect, which is beneficial to improve the user experience in the heating and cooling modes. BRIEF DESCRIPTION OF DRAWINGS

[0044] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0046] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings, which do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified. The drawings in the drawings do not constitute a proportional limitation.

[0047] Figure 1An air outlet schematic view of an indoor unit of a reversible air supply air conditioner in a cooling mode is provided for an embodiment of the present application.

[0048] Figure 2 An air outlet schematic view of an indoor unit of a reversible air supply air conditioner in a heating mode is provided for an embodiment of the present application.

[0049] Figure 3 A connection structure schematic view of an indoor heat exchanger and a liquid path switcher in a reversible air supply air conditioner is provided for an embodiment of the present application.

[0050] Figure 4 Another connection structure schematic view of an indoor heat exchanger and a liquid path switcher in a reversible air supply air conditioner is provided for an embodiment of the present application.

[0051] Figure 5 An electrical connection schematic view of a control module and electrical elements in a reversible air supply air conditioner is provided for an embodiment of the present application.

[0052] Figure 6 A flow chart of a control method of a reversible air supply air conditioner is provided for an embodiment of the present application.

[0053] Figure 7 A flow chart of a target flow calculation method in a control method of a reversible air supply air conditioner is provided for an embodiment of the present application.

[0054] Figure 8 A structure schematic view of a control device of a reversible air supply air conditioner is provided for an embodiment of the present application.

[0055] Explanation of reference signs:

[0056] 100, indoor unit; 110, casing; 111, first air outlet; 112, second air outlet; 120, indoor heat exchanger; 121, first flow collector; 122, second flow collector; 123, heat exchange pipeline; 130, fan;

[0057] 200, liquid path switcher; 210, inflow end; 220, outflow end; 230, first switch circuit; 240, second switch circuit; 250, third switch circuit; 260, fourth switch circuit; 270, circulating pump; 271, first circulating pump; 272, second circulating pump; 273, third circulating pump; 274, fourth circulating pump; 290, switch valve; 291, first switch valve; 292, second switch valve; 293, third switch valve; 294, fourth switch valve;

[0058] 310, control module; 311, processor; 312, communication interface; 313, memory; 314, communication bus; 320, flow sensor; 330, first temperature sensor; 340, second temperature sensor; 350, third temperature sensor; 360, fourth temperature sensor;

[0059] S1, first detected flow; S2, second detected flow; S0, target flow. DETAILED DESCRIPTION

[0060] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0061] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity, the elements and settings of particular examples in the following description will be described with reference to specific arrangements. These are by no means limiting and are only used to illustrate the present application. Furthermore, the present application can refer to a reference numeral and / or letter in different examples. Such repetition is for the purpose of simplicity and clarity and does not indicate any relationship between the various embodiments and / or settings discussed.

[0062] For the purpose of description, spatial relative terms as shown in the drawings can be used to describe the relative position relationship or movement condition of one element or feature relative to another element or feature, such as "internal", "external", "inboard", "outboard", "under", "below", "on", "above", "front", "back", and the like. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is flipped over or the posture is changed or the movement condition is changed, the directional indications will also change accordingly, for example: the element described as "under" or "below" another element or feature will be oriented as "above" or "over" another element or feature. Therefore, the example term "below" can include both up and down orientations. The device can be additionally oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are interpreted accordingly.

[0063] Fan-coil is a common air conditioning indoor unit, which is widely used in hotels, residences, offices and other occasions due to its concealed installation effect. However, due to the different densities of cold air and hot air, the cold air will sink and the hot air will float, thereby affecting the human comfort.

[0064] The reversible air supply fan-coil can solve the problem of cold air sinking and hot air floating by switching the air outlet direction. Based on this, for the indoor heat exchanger, if the refrigerant inside the indoor heat exchanger is in a counter-flow heat exchange state in the refrigeration mode, but in the heating mode, due to the change of the air flow direction through the indoor heat exchanger, the refrigerant in the indoor heat exchanger is in a non-counter-flow heat exchange state, which reduces the heat exchange efficiency and heating effect in the heating mode.

[0065] However, due to the unchanged air flow direction in the traditional indoor unit, the refrigerant flowing through the indoor heat exchanger can adapt to the directional air flow to achieve counter-flow heat exchange, thereby improving the heat exchange efficiency and effect of the refrigerant and air. According to experiments, for the same indoor heat exchanger, if the air flow direction is reversed, the refrigerant flowing through the indoor heat exchanger changes from counter-flow heat exchange state to counter-flow heat exchange state or non-counter-flow heat exchange state, and the heat exchange efficiency and effect of the refrigerant will be reduced by 10%~15%. In order to make up for the loss of heat exchange effect, either the fan speed is increased to increase the air flow, which will increase the power consumption and noise; in the heating mode, auxiliary heating by electric heating can also be used, but the electric heating method will greatly increase the heating power consumption and reduce the energy efficiency ratio.

[0066] Based on this, please refer to Figures 1 to 8 , the present application provides a reversible air supply air conditioner and a control method thereof, which aims to solve the problem of reducing the heat exchange efficiency and effect of the indoor heat exchanger due to reverse air outlet.

[0067] In the first aspect, as shown in Figure 1 and Figure 2 , the present application provides a reversible air supply air conditioner, which comprises an indoor unit 100, the indoor unit 100 comprising a machine shell 110, an indoor heat exchanger 120 and a fan 130. As shown in Figure 2 and Figure 3 , the reversible air supply air conditioner further comprises a liquid path switcher 200.

[0068] As shown in Figure 1 and Figure 2As shown, the casing 110 is provided with a first air outlet 111 and a second air outlet 112. The first air outlet 111 is downwardly arranged, and the second air outlet 112 is arranged at the side wall of the casing 110. Taking an air duct machine as an example, the first air outlet 111 is downwardly arranged so that the indoor unit 100 can send air downwardly through the first air outlet 111 in the heating mode, which helps the hot air to rise naturally to form a carpet heating effect. The second air outlet 112 is arranged at the side wall of the casing 110 so that the indoor unit 100 can send air laterally through the second air outlet 112 in the cooling mode, which helps the cold air to spread horizontally and sink to form a waterfall cooling effect.

[0069] The indoor heat exchanger 120 and the fan 130 are arranged in the casing 110. The fan 130 is configured to have a first air sending state and a second air sending state which can be switched. Figure 1 As shown, in the cooling mode, the fan 130 is in the second air sending state and the air outlet is arranged towards the second air outlet 112, so as to drive air to flow into the indoor unit 100 from the first air outlet 111 and to be blown out from the second air outlet 112 after flowing through the indoor heat exchanger 120. As shown, Figure 2 As shown, in the heating mode, the fan 130 is in the first air sending state and the air outlet is arranged towards the first air outlet 111, so as to drive air to flow into the indoor unit 100 from the second air outlet 112 and to be blown out from the first air outlet 111 after flowing through the indoor heat exchanger 120. By switching the air sending direction, the air outlet adjustment effect can be flexibly adjusted between the cooling mode and the heating mode. In this way, the indoor unit 100 has a good temperature adjustment effect in both the cooling mode and the heating mode.

[0070] Based on this, as shown in Figure 1 and Figure 2 The indoor heat exchanger 120 includes a first flow collecting piece 121, a second flow collecting piece 122 and a heat exchange pipeline 123. The number of the heat exchange pipeline 123 can be one, two or more. Taking the case where the number of the heat exchange pipeline 123 is more than one as an example, the plurality of heat exchange pipelines 123 are arranged by being bent, so that the refrigerant can fully contact with the external air while flowing through the heat exchange pipeline 123, thereby improving the heat exchange efficiency and effect. One or several heat exchange pipelines 123 are connected to and conductive with the first flow collecting piece 121 and the second flow collecting piece 122. In this way, the refrigerant can flow into the corresponding heat exchange pipeline 123 through the first flow collecting piece 121 and flow out through the second flow collecting piece 122. Conversely, the refrigerant can also flow into the corresponding heat exchange pipeline 123 through the second flow collecting piece 122 and flow out through the first flow collecting piece.

[0071] In combination with Figure 3 and Figure 4 The liquid path switcher 200 is connected to the first flow collecting piece 121 and the second flow collecting piece 122, and is configured to adjust the flow direction of the refrigerant in the heat exchange pipeline 123.

[0072] The liquid path switcher 200 is connected to the first and second flow collectors 121 and 122, so that the refrigerant (such as phase-change refrigerant or water, etc.) can flow into the indoor heat exchanger 120 through the liquid path switcher 200. Since the liquid path switcher 200 can adjust the flow direction of the refrigerant flowing into the indoor heat exchanger 120, in the heating mode, the refrigerant flows through the first flow collector 121, the heat exchange pipeline 123, and the second flow collector 122 in sequence through the liquid path switcher 200. In the cooling mode, the state of the liquid path switcher 200 is adjusted so that the refrigerant can flow through the second flow collector 122, the heat exchange pipeline 123, and the first flow collector 121 in sequence in the indoor heat exchanger 120.

[0073] In the heating mode, the fan 130 is in the first blowing state, and the air outlet is arranged towards the first air outlet 111, so as to drive the air to flow into the second air outlet 112 and be blown out of the first air outlet 111 after flowing through the indoor heat exchanger 120. In the cooling mode, the fan 130 is in the second blowing state, and the air outlet is arranged towards the second air outlet 112, so as to drive the air to flow into the first air outlet 111 and be blown out of the second air outlet 112 after flowing through the indoor heat exchanger 120. That is, through the configuration of the fan 130 and the liquid path switcher 200, hot air is blown out of the first air outlet 111 in the heating mode, and cold air is blown out of the second air outlet 112 in the cooling mode, and the refrigerant flowing through the heat exchange pipeline 123 has different flow directions in the heating and cooling modes to be in the counter-flow heat exchange state. Therefore, the indoor unit 100 and the indoor heat exchanger 120 have high heat exchange efficiency and heat exchange effect in the cooling and heating modes, avoiding the problem of reduced heat exchange efficiency and heat exchange effect of the indoor heat exchanger 120 due to the change of air flow direction, thereby further improving the comprehensive heat exchange efficiency of the energy-saving air conditioner in the heating and cooling modes, and having a high energy efficiency ratio. Moreover, the indoor unit 100 also takes into account the horizontal diffusion of cold air and the formation of a waterfall-type cooling effect, as well as the natural upward movement of hot air to form a carpet-type heating effect, which is beneficial to improving the user experience in the heating and cooling modes.

[0074] That is, by adjusting the arrangement position of one or more heat exchange pipelines 123 in the indoor heat exchanger 120, in the cooling mode, the air flows through the multiple heat exchange pipelines 123 from back to front (i.e., the side where the second air outlet 112 is located is the front side), but the flow direction of the refrigerant in the multiple heat exchange pipelines 123 is overall from front to back, and the refrigerant and the air are in the counter-flow heat exchange state, so as to quickly heat the flowing air and greatly improve the temperature of the heated air.

[0075] Correspondingly, in the heating mode, the air flow direction of the fan 130 is adjusted so that the air flows through the indoor heat exchanger 120 from front to back. At this time, the flow direction of the refrigerant in the plurality of heat exchange pipelines 123 is also adjusted by the liquid path switch 200 to make the overall flow direction of the refrigerant in a back-to-front state. The refrigerant and the air are also in a counter-flow heat exchange state in the heating mode to quickly cool the air flowing through and greatly reduce the temperature of the cooled air.

[0076] Therefore, through the adaptive settings of the liquid path switch 200, the fan 130, and the indoor heat exchanger 120, the refrigerant is in a counter-flow heat exchange state when flowing through the indoor heat exchanger 120 and the heat exchange pipelines 123, which has a high heat exchange efficiency and heat exchange effect. That is, by configuring the indoor heat exchanger 120, an energy-saving heat exchange device, in a counter-flow heat exchange state in the refrigeration mode and the heating mode, the power consumption of the entire machine is reduced through a high heat exchange efficiency, which is green and environmentally friendly, and has a good energy-saving and emission-reducing effect.

[0077] In some embodiments, in the heating mode, the overall flow direction of the refrigerant in the heat exchange pipeline 123 is from top to bottom. Correspondingly, in the refrigeration mode, the overall flow direction of the refrigerant in the heat exchange pipeline 123 is from bottom to top.

[0078] Since the heating mode is generally in winter or in seasons with low outdoor temperature. In the case of circulating heat conduction of the refrigerant through liquid water, by configuring the refrigerant in a overall flow direction from top to bottom when flowing through the heat exchange pipeline 123, the refrigerant in the heat exchange pipeline 123 can be quickly discharged under the action of gravity after the heating mode ends, avoiding the retention of liquid water. Thus, freezing and blockage caused by the accumulation of refrigerant in the heat exchange pipeline 123 or other refrigerant pipelines can be avoided, even the pipe cracking caused by freezing can be avoided, which has a high anti-freezing effect.

[0079] In some embodiments, as shown in Figure 3 and Figure 4 The liquid path switch 200 includes an inflow end 210, an outflow end 220, a first switching circuit 230, a second switching circuit 240, a third switching circuit 250, and a fourth switching circuit 260.

[0080] The inflow end 210 is connected to one end of the first switching circuit 230 and the second switching circuit 240. The other end of the first switching circuit 230 is connected to the first flow collector 121, and the other end of the second switching circuit 240 is connected to the second flow collector 122. One end of the third switching circuit 250 is connected to the first flow collector 121, and one end of the fourth switching circuit 260 is connected to the second flow collector 122. The other end of the third switching circuit 250 and the fourth switching circuit 260 is connected to the outflow end 220.

[0081] Based on this, the liquid path switcher 200 is configured as follows:

[0082] In the heating mode (as shown by the solid arrows in Figure 3 , the first switching circuit 230 and the fourth switching circuit 260 are turned on to make the refrigerant flow through the first header 121, the heat exchange pipeline 123 and the second header 122 in sequence. Figure 3 In the cooling mode (as shown by the dashed arrows in , the second switching circuit 240 and the third switching circuit 250 are turned on to make the refrigerant flow through the second header 122, the heat exchange pipeline 123 and the first header 121 in sequence.

[0083] Through the above configuration, in the heating mode, the refrigerant flows into the inlet 210, and then flows through the first switching circuit 230, the first header 121, the heat exchange pipeline 123, the second header 122, the fourth switching circuit 260 and the outlet 220 in sequence, thereby realizing the counter-flow circulation heat exchange of the refrigerant in the heating mode. Correspondingly, in the cooling mode, the refrigerant flows into the inlet 210, and then flows through the second switching circuit 240, the second header 122, the heat exchange pipeline 123, the first header 121, the third switching circuit 250 and the outlet 220 in sequence, thereby realizing the counter-flow circulation heat exchange of the refrigerant in the cooling mode.

[0084] In this way, only the four switching circuits in the liquid path switcher 200 need to be adjusted to control the corresponding switching circuits to be in the on state or the off state, so as to adjust the flow direction of the refrigerant in the heat exchange pipeline 123. Thus, the indoor unit 100 has high heat exchange efficiency and heat exchange effect in the heating mode and the cooling mode, and can realize the cold air horizontal diffusion and sinking to form the waterfall type cooling effect, and the hot air natural rising to form the carpet type heating effect, which is beneficial to improve the user experience in the heating mode and the cooling mode.

[0085] Exemplarily, as shown in Figure 3 and Figure 4 , the first switching circuit 230, the second switching circuit 240, the third switching circuit 250 and the fourth switching circuit 260 are provided with switching valves 290.

[0086] In heating mode (as indicated by the solid arrow), the switching valves 290 in the first switching circuit 230 and the fourth switching circuit 260 are open, while the switching valves 290 in the second switching circuit 240 and the third switching circuit 250 are closed. This allows the first switching circuit 230 and the fourth switching circuit 260 to be connected, while the second switching circuit 240 and the third switching circuit 250 are closed. Thus, the refrigerant flows in from the inlet end 210, sequentially passing through the first switching circuit 230, the first manifold 121, the heat exchange pipe 123, the second manifold 122, the fourth switching circuit 260, and the outlet end 220, thereby adapting the refrigerant to the first air supply state of the fan 130 and placing it in a counter-current heat exchange state in heating mode.

[0087] In cooling mode (as indicated by the dashed arrow), the switching valves 290 in the second switching circuit 240 and the third switching circuit 250 are open, while the switching valves 290 in the first switching circuit 230 and the fourth switching circuit 260 are closed. This allows the second switching circuit 240 and the third switching circuit 250 to be connected, while the first switching circuit 230 and the fourth switching circuit 260 are in a closed state. Thus, the refrigerant flows in from the inlet end 210, sequentially passing through the second switching circuit 240, the second manifold 122, the heat exchange pipe 123, the first manifold 121, the third switching circuit 250, and the outlet end 220, thereby adapting the refrigerant to the second air supply state of the fan 130 in cooling mode and placing it in a counter-current heat exchange state.

[0088] Thus, by setting the switching valve 290, it is easy to switch the conduction and closure states of the four switching circuits, thereby satisfying the switching control of the refrigerant flow direction in heating mode and cooling mode.

[0089] In some embodiments, such as Figure 5 As shown, the switching valve 290 includes a first switching valve 291, a second switching valve 292, a third switching valve 293, and a fourth switching valve 294. (In conjunction with...) Figure 3 The first switching valve 291 is located in the first switching circuit 230, the second switching valve 292 is located in the second switching circuit 240, the third switching valve 293 is located in the third switching circuit 250, and the fourth switching valve 294 is located in the fourth switching circuit 260. The reversible air-supply air conditioner also includes a control module 310, which is electrically connected to the first switching valve 291, the second switching valve 292, the third switching valve 293, and the fourth switching valve 294. The control module 310 is used to switch the on and off states of the first switching circuit 230, the second switching circuit 240, the third switching circuit 250, and the fourth switching circuit 260, thereby achieving automated control and regulation of the liquid circuit switcher 200.

[0090] It should be noted that, since the liquid path switcher 200 has a fixed refrigerant flow direction in the pipeline upstream of the inflow end 210 and downstream of the outflow end 220, a power pump can be configured at least one of the upstream of the inflow end 210 and the downstream of the outflow end 220 to provide power for the circulation flow of the refrigerant.

[0091] In addition, as shown in Figure 4 The first switching circuit 230, the second switching circuit 240, the third switching circuit 250 and the fourth switching circuit 260 are provided with a circulating pump 270.

[0092] In the heating mode (as shown by the solid arrow direction), the circulating pump 270 in the first switching circuit 230 and the fourth switching circuit 260 is started to turn on the first switching circuit 230 and the fourth switching circuit 260. Under the driving of the circulating pump 270, the refrigerant flows from the inflow end 210, sequentially flows through the first switching circuit 230, the first flow collector 121, the heat exchange pipeline 123, the second flow collector 122, the fourth switching circuit 260 and the outflow end 220, so that the refrigerant is adapted to the second air supply state of the fan 130 and is in the counter-flow heat exchange state in the heating mode.

[0093] In the cooling mode (as shown by the dotted arrow direction), the circulating pump 270 in the second switching circuit 240 and the third switching circuit 250 is started to turn on the second switching circuit 240 and the third switching circuit 250. Under the driving of the circulating pump 270, the refrigerant flows from the inflow end 210, sequentially flows through the second switching circuit 240, the second flow collector 122, the heat exchange pipeline 123, the first flow collector 121, the third switching circuit 250 and the outflow end 220, so that the refrigerant is adapted to the first air supply state of the fan 130 and is in the counter-flow heat exchange state in the cooling mode.

[0094] In this way, through the setting of the circulating pump 270, the refrigerant can be driven to flow along the corresponding switching circuit, that is, the setting of the circulating pump 270 can provide power for the circulation flow of the refrigerant, so as to flexibly adjust the flow output of the refrigerant by controlling the circulating pump 270, thereby adjusting the cooling or heating power at the indoor heat exchanger 120.

[0095] It should be noted that, by simultaneously configuring the circulating pump 270 in the upstream and downstream circuits of the indoor heat exchanger 120, a redundant configuration is provided for the circulation flow of the refrigerant, so as to ensure the stable operation of the air conditioning system.

[0096] In some embodiments, one-way valves are provided in the first switching circuit 230, the second switching circuit 240, the third switching circuit 250, and the fourth switching circuit 260. In the first switching circuit 230 and the second switching circuit 240, the one-way valves are configured to prevent the refrigerant from flowing to the inflow end 210. In the third switching circuit 250 and the fourth switching circuit 260, the one-way valves are configured to prevent the refrigerant from flowing to the indoor heat exchanger 120.

[0097] That is, the one-way valve in the third switching circuit 250 is configured to prevent the refrigerant from flowing to the first header 121 and the first switching circuit 230, and the one-way valve in the fourth switching circuit 260 is configured to prevent the refrigerant from flowing to the second header 122 and the second switching circuit 240, so that the refrigerant in the third switching circuit 250 and the fourth switching circuit 260 can flow towards the outflow end 220.

[0098] In some embodiments, the liquid path switcher 200 can also be composed of two two-position three-way valves. That is, the inflow end 210, the first switching circuit 230, and the second switching circuit 240 form a two-position three-way valve, and the outflow end 220, the third switching circuit 250, and the fourth switching circuit 260 form another two-position three-way valve.

[0099] In the heating mode, the inflow end 210 is connected to the first switching circuit 230, and the inflow end 210 is closed to the second switching circuit 240. In the cooling mode, the inflow end 210 is connected to the second switching circuit 240, and the inflow end 210 is closed to the first switching circuit 230. That is, by adjusting the position state of the valve core, the inflow end 210 can be connected to the first switching circuit 230 or the second switching circuit 240.

[0100] In the heating mode, the third switching circuit 250 is connected to the outflow end 220, and the outflow end 220 is closed to the fourth switching circuit 260. In the cooling mode, the fourth switching circuit 260 is connected to the outflow end 220, and the third switching circuit 250 is closed to the outflow end 220. That is, by adjusting the position state of the valve core, the outflow end 220 can be connected to the third switching circuit 250 or the fourth switching circuit 260.

[0101] In this way, the liquid path switcher 200 as a whole has only two two-position three-way valves, and the number of components is small, which can simplify the assembly process and improve the stability of the whole machine product. At this time, a circulating pump or a power pump can be provided at least one of the upstream of the inflow end 210 or the downstream of the outflow end 220 to provide power output for the circulating flow of the refrigerant.

[0102] In some embodiments, as shown in FIG. 2B, the circulating pump 270 includes a first circulating pump 271, a second circulating pump 272, a third circulating pump 273, and a fourth circulating pump 274. In combination with the above description of the liquid path switcher 200, the first circulating pump 271 is configured to provide power output for the refrigerant flowing from the first header 121 to the first switching circuit 230, the second circulating pump 272 is configured to provide power output for the refrigerant flowing from the second header 122 to the second switching circuit 240, the third circulating pump 273 is configured to provide power output for the refrigerant flowing from the third switching circuit 250 to the outflow end 220, and the fourth circulating pump 274 is configured to provide power output for the refrigerant flowing from the fourth switching circuit 260 to the outflow end 220. Figure 5 ​Figure 4 The first circulating pump 271 is arranged in the first switching circuit 230, the second circulating pump 272 is arranged in the second switching circuit 240, the third circulating pump 273 is arranged in the third switching circuit 250, and the fourth circulating pump 274 is arranged in the fourth switching circuit 260. The control module 310 is electrically connected with the first circulating pump 271, the second circulating pump 272, the third circulating pump 273, and the fourth circulating pump 274, for switching control of the on and off states of the first switching circuit 230, the second switching circuit 240, the third switching circuit 250, and the fourth switching circuit 260. Thus, the automatic control adjustment of the liquid circuit switch 200 is realized, and at the same time, the circulation flow of the refrigerant is provided with power.

[0103] In the indoor unit 100, in order to realize the change of the air supply direction, the fan 130 can be arranged as an axial fan with special blades, so as to realize the power output of different air directions by controlling the rotating direction of the blades.

[0104] Alternatively, the fan 130 is a centrifugal fan 130 and is configured to have a first air supply state and a second air supply state which are switchable. As shown in Figure 2 in the first air supply state, the volute of the fan 130 is rotated to a position where the air outlet is directed to the first air outlet 111, so as to drive the heated air to be blown out from the first air outlet 111 downward in the heating mode, which is helpful for the natural rising of the hot air to form a carpet type heating effect. As shown in Figure 1 in the second air supply state, the volute of the fan 130 is rotated to a position where the air outlet is directed to the second air outlet 112, so as to drive the cooled air to be blown out from the second air outlet 112 horizontally in the cooling mode, so as to make the cold air horizontally diffuse and settle to form a waterfall type cooling effect.

[0105] In addition, the centrifugal fan can also be configured to have two air outlets, the first air outlet is arranged to direct to the first air outlet 111, and the second air outlet is arranged to direct to the second air outlet 112. The centrifugal fan further comprises a movable switching baffle. When the baffle is moved to the first air outlet to block the air outlet, the centrifugal fan is in the second air supply state and drives the air to flow out from the second air outlet 112. When the baffle is moved to the second air outlet to block the air outlet, the centrifugal fan is in the first air supply state and drives the air to flow out from the first air outlet 111.

[0106] Based on this, as shown in Figure 5 the control module 310 is electrically connected with the fan 130, so that the control module 310 can control the fan 130 to flexibly and accurately switch the air outlet direction, so as to make the cold air horizontally diffuse and settle to form a waterfall type cooling effect in the cooling mode, and make the hot air naturally rise to form a carpet type heating effect in the heating mode.

[0107] In some embodiments, asFigure 5 As shown, the reversible air supply air conditioner comprises a first temperature sensor 330 and a second temperature sensor 340. Figure 1 The first temperature sensor 330 is arranged at the first air outlet 111 to detect the inlet air temperature or the return air temperature. The second temperature sensor 340 is arranged at the second air outlet 112 to detect the inlet air temperature or the return air temperature. The control module 310 is electrically connected with the first temperature sensor 330 and the second temperature sensor 340.

[0108] In the heating mode, the control module 310 detects the outlet air temperature at the first air outlet 111 through the first temperature sensor 330, and the control module 310 detects the return air temperature at the second air outlet 112 through the second temperature sensor 340.

[0109] In the cooling mode, the control module 310 detects the return air temperature at the first air outlet 111 through the first temperature sensor 330, and the control module 310 detects the outlet air temperature at the second air outlet 112 through the second temperature sensor 340. Thus, the return air temperature and the outlet air temperature can be detected in real time.

[0110] As shown in Figure 3 and Figure 4 , the reversible air supply air conditioner further comprises a flow sensor 320, a third temperature sensor 350 and a fourth temperature sensor 360.

[0111] The flow sensor 320 is arranged at the first flow collector 121 or the second flow collector 122, and the flow sensor 320 is arranged between the first flow collector 121 and the liquid path switcher 200, or the flow sensor 320 is arranged between the second flow collector 122 and the liquid path switcher 200, to detect the flow of the refrigerant.

[0112] The third temperature sensor 350 is arranged at the inlet flow end 210 to detect the inlet temperature of the refrigerant. The fourth temperature sensor 360 is arranged at the outlet flow end 220 to detect the outlet temperature of the refrigerant.

[0113] The control module 310 is electrically connected with the third temperature sensor 350, the fourth temperature sensor 360 and the flow sensor 320. Figure 5 The control module 310 is electrically connected with the third temperature sensor 350, the fourth temperature sensor 360 and the flow sensor 320.

[0114] For example, in the cooling mode and the heating mode, when the fan 130 is fixed at a certain gear, the control module 310 can adjust the flow and temperature of the refrigerant in real time according to the set temperature, the return air temperature, the supply air temperature, the inlet temperature and the outlet temperature, so as to meet the cooling and heating requirements under the working condition.

[0115] In a second aspect, the application further provides a control method of the reversible air supply air conditioner, which is applied to the reversible air supply air conditioner in the first aspect, and as shown in the drawings, the control method comprises a starting step, a first switching step and a second switching step. Figure 6

[0116] The starting step: obtaining first running parameters of the air conditioner. The first running parameters comprise a running mode, a fan gear, a set temperature, a return air temperature and an inflow temperature of refrigerant.

[0117] The starting step can be a running step when the air conditioner is turned on, or a running step when the running mode of the air conditioner is switched. The running mode is a heating mode, a cooling mode, a dehumidifying mode or an air supply mode, etc. When the air conditioner is started or the running state is switched, the latest running mode is determined through the received instruction. The fan gear is a speed gear of the fan 130, which is used to correspond to different air circulation amounts. The set temperature is the cooling or heating temperature in the current mode. The inflow temperature of the refrigerant can be obtained through the third temperature sensor 350.

[0118] In the heating mode, the detection temperature of the second temperature sensor 340 at the second air outlet 112 is the return air temperature. In the cooling mode, the detection temperature of the first temperature sensor 330 at the first air outlet 111 is the return air temperature.

[0119] The first switching step: judging whether the return air temperature matches the running mode. If yes, the fan is controlled to switch to the air outlet direction corresponding to the running mode.

[0120] The return air temperature matching the running mode means that the return air temperature in the heating mode is lower than the set temperature, and the return air temperature in the cooling mode is higher than the set temperature. Through the step of setting the judgment of whether the return air temperature matches the running mode, the instruction of starting or switching the mode can be preliminarily judged to avoid the occurrence of misoperation. In the first switching step, if the return air temperature matches the running mode, the air outlet direction of the fan 130 is adjusted to make the hot air naturally rise to form a carpet heating effect in the heating mode. And the cold air is horizontally diffused and settled to form a waterfall cooling effect in the cooling mode.

[0121] The second switching step: judging whether the inflow temperature of the refrigerant matches the running mode. If yes, the liquid path switcher is controlled to adjust the flow direction of the refrigerant in the heat exchange pipeline.

[0122] ​The second switching step is used to switch the flow direction of the refrigerant in the indoor heat exchanger 120. The inflow temperature of the refrigerant is detected, and the inflow temperature is matched with the operation mode. For example, the inflow temperature in the heating mode is greater than the set temperature, and the inflow temperature in the cooling mode is lower than the set temperature. Alternatively, when the inflow temperature of the refrigerant is 40-70℃, the reversible air supply air conditioner should be in the heating mode, and when the inflow temperature of the refrigerant is 4-18℃, the reversible air supply air conditioner should be in the cooling mode.

[0123] If the determination effect is met, the liquid path switch 200 is controlled to make the refrigerant in the indoor heat exchanger 120 in the refrigeration or heating mode in the counter-flow heat exchange state, so as to improve the heat exchange efficiency and heat exchange effect of the indoor unit 100 in the cooling mode and the heating mode.

[0124] The control method of the reversible air supply air conditioner can be applied to the reversible air supply air conditioner in the first aspect. The steps of the control method can be automatically executed by the control module 310, or the steps of the control method can be executed by other means. They can achieve the same technical effect, and will not be described here.

[0125] In addition, through the first switching step and the second switching step, the instructions of the reversible air supply air conditioner in the mode switching or starting process can be preliminarily judged. And in the case that the current environment meets the mode switching requirement, switch to the corresponding operation mode, such as heating mode or cooling mode.

[0126] If the current environment does not meet the mode switching requirement, such as the return air temperature does not match the switched mode or the inflow temperature of the refrigerant does not match the mode switching. The current operation mode can be maintained, or the current standby state can be maintained, or the information can be prompted to remind the mode switching failure.

[0127] It should be noted that the first switching step and the second switching step can be performed simultaneously, or the first switching step and the second switching step can be executed in sequence. Generally, the first switching step is completed before the second switching step. The switching operation of the first switching step can be completed within ten seconds after the completion of the second switching step.

[0128] It should be noted that after the completion of the first switching step and the second switching step, the refrigerant in the heat exchange pipeline 123 of the indoor heat exchanger 120 is in the counter-flow heat exchange state in the heating mode and the cooling mode, so as to maintain high heat exchange efficiency and heat exchange effect between the refrigerant and the air.

[0129] In addition, in the heating mode, the overall flow direction of the refrigerant in the heat exchange pipeline 123 is from top to bottom, so as to avoid the refrigerant (water) accumulated in the indoor heat exchanger 120 from being frozen in a low-temperature environment when the machine is stopped.

[0130] Because the fan 130 has a complex mechanical movement structure during the switching and adjustment process between the first air supply state and the second air supply state, in order to improve the switching efficiency of the fan 130 between the first air supply state and the second air supply state.

[0131] like Figure 6 As shown, after the first switching step and the second switching step, the control method includes:

[0132] Data acquisition steps: After running for the first preset time, obtain the first detection flow rate S1 of the refrigerant in the indoor heat exchanger.

[0133] The first parameter for detecting flow rate is the refrigerant flow rate, i.e., the flow velocity, within a unit space. Because air conditioners have an adaptive adjustment state during operation, they maintain a dynamic balance in the circulation system by matching the set temperature, return air temperature, outlet air temperature, refrigerant inflow temperature, and flow rate, thus balancing temperature regulation and energy saving.

[0134] Based on this, after a first preset time, such as 1-10 minutes, the circulation system maintains dynamic equilibrium. At this time, the current circulation flow rate of the refrigerant can be detected, that is, the first detected flow rate of the refrigerant can be obtained through the flow sensor 320. The first preset time can be 1 min, 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, 9 min, or 10 min.

[0135] Judgment steps: Calculate the target flow rate S0 of the refrigerant based on the first operating parameters, and compare the first detected flow rate S1 with the target flow rate S0.

[0136] If the ratio of the first detected flow S1 to the target flow S0 is greater than or equal to the first threshold, then the current operating state is maintained.

[0137] With the indoor unit 100 model determined, under different return air conditions and refrigerant inflow temperatures, the heat exchange air volume and shaft power in cooling or heating modes can be obtained or calculated under test conditions. Based on this, by substituting the parameters of heat exchange air volume and shaft power into a preset coupled fan coil model, the operating power of the entire unit and the target refrigerant flow rate can be output.

[0138] In other words, the control module 310 has multiple sets of test parameters and predictive calculation models built upon them. The first model can be used to calculate the heat exchange air volume and shaft power in cooling or heating modes by substituting the return air condition and the refrigerant inflow temperature into it. These parameters can then be substituted into the second model to calculate the overall operating power of the unit and the target flow rate of the refrigerant under the current conditions.

[0139] The model can be adjusted according to different models of the reversible air supply air conditioner. That is, in the process of calculating the target flow S0 in the judgment step, the model of the reversible air supply air conditioner can be identified in advance to adjust the product basic structure parameters such as the heat exchanger structure parameters and the fan structure parameters, the performance curve, etc. according to the preset content or network access.

[0140] In this way, the target flow S0 and the first detected flow S1 are compared. If the ratio of the first detected flow S1 to the target flow S0 is greater than or equal to the first threshold value, it indicates that the fan 130 can accurately switch to the position without loss of air volume in the switching adjustment between the first air supply state and the second air supply state, and the flow of the corresponding refrigerant is within the preset range, so the current operating state is maintained.

[0141] It is explained that the first threshold value can be 94-96%, such as 94%, 95% or 96%. Due to the existence of the reversible air supply air conditioner installation environment and assembly error, the flow of the refrigerant in the actual operating condition has a certain difference value from the target flow S0. By setting the first threshold value, the error value caused by the environment and the product can be excluded.

[0142] However, if the ratio of the first detected flow S1 to the target flow S0 is less than the first threshold value, it indicates that the switching of the air supply state of the fan 130 may be abnormal and needs to be solved according to different situations.

[0143] For example, as shown in Figure 7 The process of calculating the target flow S0 includes the following steps:

[0144] First, the model of the reversible air supply air conditioner is identified. The structure parameters of the indoor heat exchanger 120 and the performance curve of the fan 130 are obtained according to the identified model. On this basis, the coupled and adapted fan disc prediction model can be searched according to the local storage information or through network connection server. According to the fan gear and the inflow temperature of the refrigerant, the air circulation amount and the operating power of the fan 130 in the current mode are simulated and calculated, which can be calculated according to the preset test parameters and the corresponding curve model. Finally, the calculation results, i.e. the air circulation amount and the operating power of the fan 130, are substituted into the above-mentioned fan disc prediction model to output the whole machine operating power and the inflow amount of the refrigerant, which is the target flow S0.

[0145] In some embodiments, as shown in Figure 6 In the judgment step, if the ratio of the first detected flow to the target flow is between the second threshold value and the first threshold value, the control method includes:

[0146] If the ratio of the first detected flow S1 to the target flow S0 is between the second threshold value and the first threshold value, the control fan performs mechanical reset on the air outlet direction of the fan according to the current operating mode. The second threshold value is less than the first threshold value.

[0147] Then return to execute the collection step.

[0148] If the ratio of the first detected flow S1 to the target flow S0 is still between the second threshold value and the first threshold value after the secondary detection.

[0149] Adjust the fan gear to the silent gear, and prompt the fault.

[0150] Among them, taking the current reversible air supply air conditioner in heating mode and the fan 130 adjusting the air outlet direction by rotating the volute as an example, the mechanical reset means that after the fan 130 is switched from the first air supply state to the second air supply state, it continues to rotate to the first air supply state.

[0151] In addition, in the case where the fan 130 adjusts the air outlet direction by adjusting the opening and closing of the air outlet, the mechanical reset means that after the baffle at the air outlet of the first air outlet 111 is rotated to the position of closing the air outlet, it is continuously rotated to switch to the position of completely opening the air outlet.

[0152] Among them, the second threshold value can be 89-91%, such as 89%, 90% or 91%, which is not limited. The ratio of the first detected flow S1 to the target flow S0 is between the second threshold value and the first threshold value, that is, 90%≤S1 / S0<95%.

[0153] Under the above conditions, although the first detected flow S1 does not reach the target flow S0, the first detected flow S1 still maintains about 90% of the target flow S0. It indicates that there may be a part that does not switch to the right position in the switching process of the fan 130 between the first air supply state and the second air supply state. This may cause poor air tightness of the air duct, thereby reducing the static pressure at the indoor unit 100 to cause the problem of reduced return air volume.

[0154] In this way, by performing the mechanical reset operation, the fan 130 that fails to switch to the right position is repeatedly switched once, which is beneficial to enable the fan 130 to be stably switched to the right first air supply state or the second air supply state. So that the fan 130 can maintain a stable air supply volume at the preset gear to improve the cooling or heating effect of the indoor unit 100.

[0155] After performing the reset operation, return to the collection step, and after maintaining stable operation for the first preset time, repeatedly collect the first detected flow S1 to compare the size of the current first detected flow S1 with the target flow S0.

[0156] If S1 / S0≥95%, it indicates that the reset operation is valid, that is, the air supply state of the fan 130 is switched to the position, so that the return air volume meets the preset index requirement. The flow rate of the refrigerant in the heat exchange balance state also meets the preset index requirement.

[0157] If the comparison of the secondary detection result is still 90%≤S1 / S0<95% after the reset operation is performed, it indicates that the reset operation is invalid. At this time, the control system adjusts the fan gear to a low gear, such as a silent gear. Since the fan 130 is not seriously leaking in this case, the low-power refrigeration or heating effect can be maintained, and then a fault prompt is issued in the form of sound, diagram or vibration to remind the user to repair as soon as possible.

[0158] In addition, as shown in the judgment step, if the ratio of the first detection flow rate to the target flow rate is between the third threshold value and the second threshold value, the control method comprises: Figure 6

[0159] The liquid path switcher switches the flow direction of the refrigerant in the heat exchange pipeline. The third threshold value, the second threshold value and the first threshold value increase in turn.

[0160] After running for a second preset time, a second detection flow rate S2 of the refrigerant in the indoor heat exchanger is obtained.

[0161] The second detection flow rate S2 and the target flow rate S0 are compared.

[0162] If the ratio of the second detection flow rate to the target flow rate is greater than or equal to the first threshold value, the air outlet direction of the fan and the liquid path switcher are adjusted reversely according to the current running state, and the air supply state information of the fan is updated.

[0163] If the ratio of the second detection flow rate to the target flow rate is between the second threshold value and the first threshold value, the current state of the liquid path switcher is maintained and the collection step is returned to be executed.

[0164] If the ratio of the second detection flow rate to the target flow rate is still between the third threshold value and the second threshold value, the air conditioner is stopped and a fault is prompted.

[0165] The third threshold value can be 79-81%, such as 79%, 80% or 81%, which is not limited. The ratio of the first detection flow rate S1 to the target flow rate S0 between the third threshold value and the second threshold value can be 80%≤S1 / S0<90%.

[0166] Since the ratio of the first detection flow rate S1 to the target flow rate S0 is less than 90%, it indicates that there is a large difference between the first detection flow rate S1 and the target flow rate S0. At this time, it may be caused by the air supply state switching error of the fan 130, or there may be a large difference between the target position and the air supply state switched by the fan 130, that is, there may be many possible problems.​

[0167] Based on this, the current air supply state of the fan 130 can be maintained, and the liquid path switcher 200 is controlled to adjust the indoor heat exchanger 120 and the heat exchanger pipeline 123 to reverse the flow of the refrigerant. If the original first switching circuit 230 and the fourth switching circuit 260 are turned on, the second switching circuit 240 and the third switching circuit 250 are switched to be turned on to change the flow direction of the refrigerant in the indoor heat exchanger 120.

[0168] After the system is stably operated for a second preset time, a second detected flow rate S2 of the refrigerant in the indoor heat exchanger 120 is obtained, and the second detected flow rate S2 and the target flow rate S0 are compared. The first and second detected flow rates are obtained by a flow sensor. The second preset time can be the same as or different from the first preset time, and both are in the range of 1-10 min.

[0169] If the ratio of the second detected flow rate S2 to the target flow rate S0 is greater than the first threshold value, it indicates that the air supply amount and the refrigerant are in a dynamic balance stage, and the air outlet of the fan 130 is switched in place, but the switching direction is opposite. At this time, the air supply direction of the fan 130 and the liquid path switcher 200 need to be adjusted in the opposite direction according to the current operating state, so that the indoor unit 100 blows air from the first air outlet 111 in the heating mode and blows air from the second air outlet 112 in the cooling mode. At the same time, the air supply state information of the fan 130 is updated and recorded, and the error information of the original air supply state of the fan 130 is corrected.

[0170] In this way, while ensuring the air supply amount, the cold air can be horizontally diffused and settled to form a waterfall type cooling effect, and the hot air can be naturally lifted to form a carpet type heating effect, providing a better cooling and heating experience.

[0171] When comparing the second detected flow rate S2 and the target flow rate S0, if the ratio of the second detected flow rate S2 to the target flow rate S0 is between the second threshold value and the first threshold value, such as 90%≤S2 / S0<95%, it indicates that the fan 130 has not been switched to place when switching the air supply state.

[0172] In this way, the liquid path switcher 200 is controlled to reset, and the fan 130 is controlled to perform mechanical reset on the air supply direction of the fan 130 according to the current operating mode. For example, the rotational position of the volute is repeatedly adjusted, or the position of the air outlet baffle is repeatedly adjusted. Then return to execute the collection step, that is, after stably operating for a first preset time, the first detected flow rate S1 is repeatedly collected for repeated comparison of the first detected flow rate S1 and the target flow rate S0.

[0173] That is, after the above-mentioned mechanical reset operation step is performed, the air supply state of the fan 130 can be switched to the in-place state. That is, by repeatedly performing the collection step to determine whether the reset fan 130 is in the in-place air supply state, the air volume of the indoor unit 100 can be avoided.

[0174] In the comparison between the second detected flow S2 and the target flow S0, there is another case. If the ratio of the second detected flow S2 to the target flow S0 is between the third threshold and the second threshold, such as 80%≤S2 / S0<90%. Then it indicates that the fan 130 is in the abnormal state of being stuck. At this time, the mechanical structure of the fan 130 in the mechanism for adjusting the air outlet direction cannot be moved or cannot be accurately moved to the position corresponding to the air supply state, and cannot be adjusted by mechanical reset operation. At this time, the air conditioner is stopped and the fault is prompted, and manual maintenance is required.

[0175] It should be noted that in the collection step, the ratio of the first detected flow S1 to the target flow S0 is usually not less than the third threshold. However, if the ratio of the first detected flow S1 to the target flow S0 is less than the third threshold, it indicates that the air supply switching structure of the fan 130 has a large defect, which can be a defect in the structure shape (such as damage to the air duct wall), or a fault of the control device (such as unable to move to switch the air supply state). At this time, the fault is directly prompted and the machine is stopped to remind the user to repair as soon as possible.

[0176] In a third aspect, as shown in Figure 8 The control device of the reversible air supply air conditioner, that is, the control module 310, includes a processor 311, a communication interface 312, a memory 313, and a communication bus 314. The processor 311, the communication interface 312, and the memory 313 communicate with each other through the communication bus 314. The memory 313 is used to store computer programs.

[0177] In an embodiment of the present application, the processor 311 is used to execute the computer program stored in the memory 313, and the execution steps of the control method of the reversible air supply air conditioner in the second aspect are realized.

[0178] The present application also provides a computer readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to realize the execution steps of the control method of the reversible air supply air conditioner in the second aspect.

[0179] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.

[0180] With the above description of implementation, those skilled in the art can clearly understand that each embodiment can be realized by means of software plus a general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions essentially or in other words make contributions to the related art, which can be embodied in the form of a software product. The computer software product can be stored in a computer readable storage medium, such as a ROM (Read-Only Memory), a RAM (Random Access Memory), a magnetic disk, an optical disk, and the like, and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of the embodiments or some parts of the embodiments. Although the terms first, second, third, etc. can be used in this document to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be used only to distinguish one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, the terms such as "first", "second" and other numerical terms are used herein without implying any order or sequence. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0181] The above description is merely illustrative of the application and not restrictive. Various modifications can be made to the embodiments described without departing from the spirit or scope of the application. Accordingly, the application is not to be restricted based on the specific examples described herein, but is to be defined in the terms of the claims presented herein, and equivalents thereof.

Claims

1. A control method of a reversible air supply air conditioner, characterized by, The application is applied to reversible air supply air conditioner, the reversible air supply air conditioner includes indoor unit and liquid path switcher, the indoor unit includes machine shell, indoor heat exchanger and fan, the machine shell is equipped with first air outlet and second air outlet, the first air outlet is arranged downward, the second air outlet is located in the side wall of the machine shell, the fan and the indoor heat exchanger are arranged in the machine shell, the indoor heat exchanger includes first flow collector, second flow collector and heat exchange pipeline, both ends of the heat exchange pipeline are connected with the first flow collector and the second flow collector, the fan is configured to drive air to blow out from the first air outlet in heating mode and to drive air to blow out from the second air outlet in cooling mode, the liquid path switcher is connected with the first flow collector and the second flow collector, and the liquid path switcher is configured to adjust the flow direction of refrigerant in the heat exchange pipeline. The control method comprises: Starting step: obtaining the first operating parameter of the air conditioner; the first operating parameter includes operating mode, fan gear, set temperature, return air temperature and refrigerant inflow temperature; First switching step: judging whether the return air temperature matches the operating mode; if yes, controlling the fan to switch to the air outlet direction corresponding to the operating mode; Second switching step: judging whether the refrigerant inflow temperature matches the operating mode; if yes, controlling the liquid path switcher to adjust the flow direction of refrigerant in the heat exchange pipeline; Collecting step: after running for a first preset time, obtaining the first detected flow of refrigerant in the indoor heat exchanger; Judging step: calculating the target flow of refrigerant according to the first operating parameter, and comparing the first detected flow with the target flow; If the ratio of the first detected flow to the target flow is greater than or equal to a first threshold value, the current operating state is maintained.

2. The control method of the reversible air supply air conditioner according to claim 1, characterized by, In the first switching step, the return air temperature in the heating mode is less than the set temperature, and the return air temperature in the cooling mode is greater than the set temperature; In the second switching step, the inflow temperature in the heating mode is greater than the set temperature, and the inflow temperature in the cooling mode is less than the set temperature.

3. The control method of the reversible air supply air conditioner according to claim 1, characterized by, In the judging step, if the ratio of the first detected flow to the target flow is between a second threshold value and the first threshold value, the control method comprises: Controlling the fan to perform mechanical reset on the air outlet direction of the fan according to the current operating mode; the second threshold value is less than the first threshold value; Returning to execute the collecting step; If the ratio of the first detected flow to the target flow is still between the second threshold value and the first threshold value after secondary detection; Adjusting the fan gear to a mute gear and prompting a fault.

4. The control method of the reversible air supply air conditioner according to any one of claims 1 to 3, characterized by, In the judging step, if the ratio of the first detected flow to the target flow is between a third threshold value and a second threshold value, the control method comprises: Controlling the liquid path switcher to switch the flow direction of refrigerant in the heat exchange pipeline; the third threshold value, the second threshold value and the first threshold value increase in turn; After running for a second preset time, obtaining the second detected flow of refrigerant in the indoor heat exchanger; Comparing the second detected flow with the target flow; If the ratio of the second detected flow rate to the target flow rate is greater than or equal to the first threshold value, the air outlet direction of the fan and the liquid path switcher are reversely adjusted according to the current operating state, and the air supply state information of the fan is updated; If the ratio of the second detected flow rate to the target flow rate is between the second threshold value and the first threshold value, the liquid path switcher is controlled to reset, the air outlet direction of the fan is mechanically reset according to the current operating mode, and the collecting step is returned to be executed; If the ratio of the second detected flow rate to the target flow rate is still between the third threshold value and the second threshold value, the air conditioner is controlled to stop and a fault is prompted.

5. The control method of the reversible air supply air conditioner according to claim 4, characterized by, The control method comprises: If the ratio of the first detected flow rate to the target flow rate is less than the third threshold value, the air conditioner is controlled to stop and a fault is prompted; and / or, The first threshold value is 95%, the second threshold value is 90%, and the third threshold value is 80%.

6. A reversible air supply air conditioner, characterized by, Comprise: An indoor unit, the indoor unit comprises a shell, an indoor heat exchanger and a fan, the shell is provided with a first air outlet and a second air outlet, the first air outlet is arranged downward, and the second air outlet is located on the side wall of the shell; the fan and the indoor heat exchanger are arranged in the shell; the indoor heat exchanger comprises a first flow collector, a second flow collector and a heat exchange pipeline, both ends of the heat exchange pipeline are connected with the first flow collector and the second flow collector; the fan is configured to blow air out of the first air outlet in a heating mode and blow air out of the second air outlet in a cooling mode; A liquid path switcher connected with the first flow collector and the second flow collector, the liquid path switcher is configured to adjust the flow direction of the refrigerant in the heat exchange pipeline; And a control module configured to execute the control method of the reversible air supply air conditioner according to any one of claims 1-5.

7. The reversible air supply air conditioner according to claim 6, wherein The liquid path switcher comprises an inlet end, an outlet end, a first switching circuit, a second switching circuit, a third switching circuit and a fourth switching circuit; The inlet end is connected with one end of the first switching circuit and the second switching circuit, the other end of the first switching circuit is connected with the first flow collector, and the other end of the second switching circuit is connected with the second flow collector; One end of the third switching circuit is connected with the first flow collector, one end of the fourth switching circuit is connected with the second flow collector, and the other ends of the third switching circuit and the fourth switching circuit are connected with the outlet end; The liquid path switcher is configured to: In the heating mode, the first switching circuit and the fourth switching circuit are turned on to make the refrigerant flow through the first flow collector, the heat exchange pipeline and the second flow collector in sequence; In the cooling mode, the second switching circuit and the third switching circuit are turned on to make the refrigerant flow through the second flow collector, the heat exchange pipeline and the first flow collector in sequence.

8. The reversible air supply air conditioner according to claim 7, characterized in that, Switching valves are arranged in the first switching circuit, the second switching circuit, the third switching circuit and the fourth switching circuit; In the heating mode, the switching valves in the first switching circuit and the fourth switching circuit are opened, and the switching valves in the second switching circuit and the third switching circuit are closed. In the cooling mode, the switching valves in the second switching circuit and the third switching circuit are opened, and the switching valves in the first switching circuit and the fourth switching circuit are closed.

9. The reversible air supply air conditioner according to claim 8, characterized in that, The first switching circuit, the second switching circuit, the third switching circuit and the fourth switching circuit are provided with circulating pumps; In the heating mode, the circulating pumps in the first switching circuit and the fourth switching circuit are started to drive the refrigerant to flow from the first switching circuit into the indoor heat exchanger; In the cooling mode, the circulating pumps in the second switching circuit and the third switching circuit are started to drive the refrigerant to flow from the second switching circuit into the indoor heat exchanger.

10. The reversible air supply air conditioner according to claim 7, characterized in that, The inlet, the first switching circuit and the second switching circuit constitute a two-position three-way valve, and the outlet, the third switching circuit and the fourth switching circuit constitute a two-position three-way valve; In the heating mode, the inlet is connected to the first switching circuit, and the third switching circuit is connected to the outlet; in the cooling mode, the inlet is connected to the second switching circuit, and the fourth switching circuit is connected to the outlet.

11. The reversible air supply air conditioner according to any one of claims 6-10, characterized in that, The fan is a centrifugal fan and is configured to have switchable first and second air supply states; In the first air supply state, the volute of the fan is rotated to a position in which the air outlet is directed towards the first air port; In the second air supply state, the volute of the fan is rotated to a position in which the air outlet is directed towards the second air port.

12. The reversible air supply air conditioner according to any one of claims 6-10, characterized in that, In the heating mode and the cooling mode, the refrigerant in the heat exchange pipeline is in a counter-flow heat exchange state; and / or, In the heating mode, the overall flow direction of the refrigerant in the heat exchange pipeline is from top to bottom.

13. The reversible air supply air conditioner according to any one of claims 7-10, characterized in that, The reversible air supply air conditioner comprises: a first temperature sensor arranged at the first air port; a second temperature sensor arranged at the second air port; a third temperature sensor arranged at the inlet and used for detecting the inflow temperature of the refrigerant; a fourth temperature sensor arranged at the outlet and used for detecting the outflow temperature of the refrigerant; and a flow sensor arranged at the first or second flow collecting member and used for detecting the flow rate of the refrigerant.

Images